WO2007142143A1 - Dispositif magnétique, circuit de source de puissance à découpage utilisant le dispositif et procédé de commande pour le circuit - Google Patents

Dispositif magnétique, circuit de source de puissance à découpage utilisant le dispositif et procédé de commande pour le circuit Download PDF

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Publication number
WO2007142143A1
WO2007142143A1 PCT/JP2007/061196 JP2007061196W WO2007142143A1 WO 2007142143 A1 WO2007142143 A1 WO 2007142143A1 JP 2007061196 W JP2007061196 W JP 2007061196W WO 2007142143 A1 WO2007142143 A1 WO 2007142143A1
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WIPO (PCT)
Prior art keywords
winding
transformer
circuit
temperature
amorphous metal
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Ceased
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PCT/JP2007/061196
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English (en)
Japanese (ja)
Inventor
Hideo Sato
Takahiro Kobayashi
Hiroaki Takahashi
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Oki Power Tech Co Ltd
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Oki Power Tech Co Ltd
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Publication of WO2007142143A1 publication Critical patent/WO2007142143A1/fr
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections

Definitions

  • the present invention relates to a magnetic device including a transformer having a magnetic core or a choke coil, and more particularly to a switching power supply circuit using such a magnetic device and a control method thereof.
  • switching power supplies that are small and light and can efficiently extract electric power are widely used along with the small and light electronic devices.
  • a transformer is used when electrical insulation is required between the input side and the output side.
  • a chopper type switching power supply using a choke coil instead of a transformer may be used.
  • a ferrite having a low loss and high efficiency is used as a magnetic body serving as a core of a transformer or a choke coil.
  • ferrite easily saturates magnetically, if the current of the coiled wire exceeds a certain value, the core is saturated and the magnetic properties are degraded. Further, since ferrite has low thermal conductivity, heat generation of the core becomes a problem.
  • a switching power supply capable of outputting a current even in an overload state is desired to supply a sufficient current to a solenoid of a plunger that drives a print head.
  • JP-A-63-86408 Japanese Patent Application Publication JP-A-63-86408, has a groove formed on the extension line of the central leg of a Japanese-shaped iron core with a saddle wire on the central leg.
  • a winding apparatus characterized by providing an overheat protection device is disclosed. According to this winding device, it is possible to cause magnetic saturation abruptly when a short-circuit occurs, promote heat generation in the groove, and speed up the shut-off operation of the overheat protection device.
  • this scoring device detects a temperature rise of the iron core, and is not particularly disclosed with respect to detecting a temperature rise of the scoring.
  • the present invention uses a magnetic material having a high saturation magnetic flux density and good heat dissipation as a core of a transformer or choke coil, and also causes a winding due to excessive current flowing in the winding. It is an object of the present invention to provide a magnetic device that can quickly and accurately detect an increase in the temperature of an object and prevent accidents due to heat generation. Furthermore, an object of the present invention is to provide a switching power supply circuit using such a magnetic device and a control method thereof.
  • a magnetic device includes: (a) a core including a magnetic metal of amorphous metal, a primary winding wound around the core, and 2 A transformer having a group of windings including a secondary winding, (b) a set of l primary terminals and a set of secondary terminals, and (c) one end of a primary winding of the transformer, Connected in series between one set of primary terminals or between one end of the transformer secondary winding and one of the secondary terminals inside the winding group Or a fuse fixed outside and cut at a temperature lower than a single point of amorphous metal.
  • a magnetic device includes (a) a core including an amorphous metal magnetic body, and a primary side wire and a secondary side wire wound around the core. (B) l set of primary side terminals and 1 set of secondary side terminals, and (c) an amorphous metal curie point fixed to the inside or outside of the wire group. Change the temperature characteristics at a lower temperature Having a temperature sensor.
  • the switching power supply circuit according to one aspect of the present invention is connected in series with the magnetic device according to the second aspect of the present invention and the primary side winding of the transformer, and the transformer power supply circuit according to the drive signal
  • a switching element that causes an alternating current to flow through the primary side wire, an output circuit that generates an output voltage based on a voltage generated at the secondary side wire of the transformer, and a current that flows through the primary side wire of the transformer
  • a control circuit that generates a drive signal based on the output voltage of the output circuit so that the detection result obtained by using the temperature sensor indicates a temperature lower than the Curie point of the amorphous metal. Limits the current that flows in the primary side of the transformer.
  • the control method according to one aspect of the present invention is connected in series with the magnetic device according to the second aspect of the present invention and the primary side of the transformer, and the primary side of the transformer according to the drive signal.
  • a control method of a switching power supply circuit including a switching element that causes an alternating current to flow through a wire and an output circuit that generates an output voltage based on a voltage generated on the secondary side of the transformer, the primary side of the transformer
  • an amorphous metal magnetic material having a high saturation magnetic flux density and good heat dissipation is used as a core of a transformer or a choke coil, and
  • a fuse connected in series with the terminal and fixed inside or outside the winding group and cut at a temperature lower than the Curie point of amorphous metal, excessive current flows in the winding line. Therefore, it is possible to quickly and accurately detect the temperature rise of the shoreline caused by this, and to prevent accidents due to heat generation.
  • an amorphous metal magnetic material having a high saturation magnetic flux density and good heat dissipation is used as a core of a transformer or a choke coil.
  • a temperature sensor that is fixed inside or outside the line and has a temperature characteristic change point at a temperature lower than the Curie point of amorphous metal
  • Magnetic device capable of quickly and accurately detecting an increase in the temperature of the winding wire due to current flowing in the winding wire to prevent an accident due to heat generation, and a switching power supply circuit using such a magnetic device and its A control method can be provided.
  • FIG. 1 is a diagram showing a configuration of a magnetic device according to a first embodiment of the present invention.
  • FIG. 2A is a perspective view of the magnetic device shown in FIG.
  • FIG. 2B is a horizontal sectional view of the magnetic device shown in FIG. 1 near the center of the transformer.
  • FIG. 3 is a diagram showing a configuration of a switching power supply circuit according to the first embodiment of the present invention.
  • FIG. 4 is a circuit diagram showing a configuration example of a secondary side voltage detection circuit and the like shown in FIG.
  • FIG. 5 is a diagram showing in detail the configuration of the control circuit and the like shown in FIG.
  • FIG. 6 is a flowchart showing an example of a basic control operation of the DSP shown in FIG.
  • FIG. 7 is a diagram showing output current output voltage characteristics of the switching power supply circuit shown in FIG.
  • FIG. 8 (a) is a diagram showing a change in secondary current of the switching power supply circuit shown in FIG. 3, and (b) is a diagram showing a change in the winding temperature of the transformer.
  • FIG. 9 is a diagram showing a configuration of a switching power supply circuit according to a second embodiment of the present invention.
  • FIG. 10 is a diagram showing a configuration of a magnetic device according to a second embodiment of the present invention.
  • FIG. 11 is a diagram showing in detail the configuration of the control circuit and the like shown in FIG.
  • FIG. 12 is a diagram showing a configuration of a switching power supply circuit according to a third embodiment of the present invention.
  • FIG. 13 is a diagram showing a configuration of the PFC circuit shown in FIG.
  • FIG. 14 is a diagram showing a configuration of a magnetic device according to a third embodiment of the present invention.
  • FIG. 15 is a diagram showing a configuration of a switching power supply circuit according to a fourth embodiment of the present invention.
  • FIG. 16 A diagram showing a configuration of a switching power supply circuit according to a fifth embodiment of the present invention.
  • FIG. 16 is a cross-sectional view of a magnetic device according to a fifth embodiment of the present invention.
  • FIG. 1 is a diagram showing a configuration of a magnetic device according to the first embodiment of the present invention.
  • the magnetic device 100 includes a primary side terminals 101 and 102 to which an AC voltage is applied, a thermal fuse 10 having one end connected to the primary side terminal 101, a thermal terminal 10 connected to the other end of the thermal fuse 10, and a primary side terminal 102.
  • the transformer is connected to the secondary side, and has a transformer 20 that boosts or steps down the AC voltage on the primary side and outputs it to the secondary side, and secondary terminals 103 and 104 that output a voltage boosted or stepped down by the transformer 20. is doing.
  • the thermal fuse 10 is connected in series between the primary side terminal 101 and the primary side wire 21 of the transformer. When the current flowing in the transformer wire 21 or 22 reaches a predetermined value, the current fuse The circuit is shut off by the heat generated by the wire 21 or 22 and the heat generated by itself.
  • the transformer 20 includes a magnetic core 23, and a primary side winding 21 and a secondary side winding 22 that are wound around the core 23. If the number of primary side wires 21 is N1 and the number of secondary side wires 22 is N2, then assuming that there is no loss, the step-up ratio between the primary side and the secondary side is It becomes N2ZN1. Further, an auxiliary feeder 25 may be provided in the transformer 20. The dot symbol attached to the transformer 20 indicates the polarity of the winding.
  • an amorphous metal magnetic body having a high saturation magnetic flux density and a high thermal conductivity is used as the core 23 of the transformer.
  • an amorphous alloy Fe—Co (60 to 80 wt%) containing iron (Fe) and cobalt (Co) can be used.
  • the core type a bulk type formed by sintering a powder material or a laminate type in which ribbon-like cores are laminated can be used.
  • Amorphous metal magnetic material has a higher saturation magnetic flux density and higher thermal conductivity than that of light. Small changes in magnetic properties due to temperature are small. Hysteresis loss and eddy current loss are small, and high-frequency characteristics are good. ing.
  • an amorphous metal magnetic body as the core of a transformer or choke coil, the core does not easily saturate magnetically, so the amount of heat generated is small. Since it is not necessary to form gaps in the core, leakage of magnetic flux with gap force is not a problem.
  • the inductance per power (also referred to as “AL value”) is smaller than when using ferrite. Even if the degree is increased, the inductance of the winding becomes smaller and the current flowing through the winding increases. In addition, since the magnetic material of amorphous metal is difficult to saturate, the peak current flowing in the shoreline can be increased.
  • heat loss is represented by copper loss typified by Joule heat generated by current flowing through the winding and iron loss typified by hysteresis loss and eddy current loss. causes it to occur.
  • copper loss typified by Joule heat generated by current flowing through the winding
  • iron loss typified by hysteresis loss and eddy current loss.
  • FIG. 2A is a perspective view of the magnetic device shown in FIG. 1, and FIG. 2B is a horizontal cross-sectional view of the magnetic device shown in FIG. 1 near the center of the transformer.
  • a bobbin 24 is incorporated in an EE type core 23 of the transformer, and winding wires 21 and 22 are wound around the bobbin 24.
  • the primary side wire 21 may be wound inwardly, the secondary side wire 22 may be turned outside, and the secondary side wire 22 may be turned inside, and the primary side wire 21 may be wound.
  • the primary side wire 21 and the secondary side wire 22 may be wound at the same time.
  • the auxiliary winding 25 (Fig. 1) is provided, for example, the auxiliary winding 25 is wound inside, and the primary side winding 21 or the secondary side winding 22 is wound around the outermost periphery. .
  • a plurality of mounting pin terminals are provided on the substrate 28 to which the core 23 is attached, and lead wires 26 from the feeders 21 and 22 are through holes 27 in four of them.
  • the primary side terminals 101 and 102 and the secondary side terminals 103 and 104 are constituted by being connected to each other.
  • an insulating substrate may be used, or only a periphery of the terminal may be insulated using a conductive substrate such as metal.
  • the thermal fuse 10 is fixed to the inside or outside of the winding 21 or 22, so that thermal coupling with the winding is achieved.
  • the thermal fuse 10 may be wound around the surface of the wire 21 or 22 and wound on the wire.
  • the thermal fuse 10 may be fixed to the outside of the winding 21 or 22 by taping. In this way, by adopting a configuration in which the thermal fuse 10 is fixed to the feeder line 21 or 22, the heat generated by the overcurrent flowing in the feeder line 21 or 22 can be transmitted to the thermal fuse 10 quickly and reliably. .
  • the thermal fuse 10 When the thermal fuse 10 is located in the deep layer of the shoreline (near the bobbin 24), when the shoreline is turned to the bobbin 24 using a shoreline machine, the shape of the shoreline is symmetrical. Instead, the part where the temperature fuse 10 is located is biased. As a result, physical stress is added to the shoreline, leading to an accident such as disconnection. Therefore, it is preferable that the thermal fuse 10 is wound around the surface of the shoreline 21 or 22, as shown in FIG. 2B.
  • the control circuit monitors fluctuations in the primary side current and the secondary side voltage, controls the drive signal to be supplied to the switching element, and destroys the switching element. By preventing it, electrical protection measures are taken.
  • amorphous metal is used for the core of the transformer or choke coil, overcurrent corresponding to dynamic load fluctuations may flow instantaneously in the winding due to the characteristics of the amorphous metal. . In such a case, the insulation film of the shoreline may be burned out or smoke may be generated due to heat generated by overcurrent. Therefore, in addition to electrical protection measures such as control circuits, protection measures against heat generation due to instantaneous overcurrent are required.
  • the thermal fuse 10 connected in series to the primary side wire 21 of the transformer is fixed to the primary side wire 21 or the secondary side wire 22, the primary side When overcurrent flows through the feeder 21 and the secondary feeder 22, the thermal fuse 10 is blown by the heat of the primary feeder 21 or the secondary feeder 22 in addition to the heat generated by the thermal fuse 10 itself.
  • the thermal fuse 10 By interrupting the current path between the primary terminal 101 and the primary side wire 21 of the transformer, it is possible to prevent accidents such as burnout of the insulation film and smoke generation due to heat generation.
  • the temperature at which the thermal fuse 10 blows (melting temperature) is set to be lower than the Curie point of the amorphous metal used for the core 23 (the temperature at which the magnetic material loses magnetism).
  • Amorphous metal magnetics crystallize as the temperature rises, and when the temperature exceeds the Curie point, they lose their amorphous properties, and even if the temperature is lowered below the Curie point again, the amorphous material becomes amorphous. Does not restore quality as a property. Therefore, the fusing temperature of the thermal fuse 10 is By setting as described above, the magnetic properties of the amorphous metal can be maintained.
  • FIG. 3 is a diagram showing a configuration of the switching power supply circuit according to the first embodiment of the present invention.
  • This switching power supply circuit includes a rectifying / smoothing circuit 40 connected to the input terminals 1 and 2 of the AC power supply voltage, the magnetic device 100 described above, and the primary side winding of the transformer included in the magnetic device 100.
  • the switching element 50 is connected in series to 21 and flows current to the primary side 21 of the transformer according to the pulsed drive signal, and the primary current that detects current that flows to the primary side 21 of the transformer.
  • a detection circuit 60 is provided to the input terminals 1 and 2 of the AC power supply voltage, the magnetic device 100 described above, and the primary side winding of the transformer included in the magnetic device 100.
  • the switching element 50 is connected in series to 21 and flows current to the primary side 21 of the transformer according to the pulsed drive signal, and the primary current that detects current that flows to the primary side 21 of the transformer.
  • a detection circuit 60 is a detection circuit 60.
  • this switching power supply circuit includes a thermistor 41, a capacitor 42, and a switching element 43 connected in series between primary terminals 101 and 102 of the magnetic device 100.
  • These elements constitute an active clamp circuit for limiting the voltage generated between the primary terminals of the magnetic device 100 within a certain range.
  • the switching element 43 is normally in an off state, but is temporarily turned on immediately after the switching element 50 is turned off, and a part of the energy accumulated in the core 23 of the transformer is accumulated in the capacitor 42.
  • the transformer 20 or the switching element 50 is protected from a pulse-like overvoltage.
  • the energy stored in the capacitor 42 of the active clamp circuit is used effectively, for example, by regenerating power in the power supply system.
  • the switching element 43 is controlled by the control circuit 90.
  • the thermistor 41 is configured so that the active clamp circuit does not break due to a large current when the switching element 50 is turned off and the switching element 43 is turned on to operate the active clamp circuit. Used to prevent overcurrent from flowing through the active clamp circuit.
  • this switching power supply circuit includes a diode 71 for half-wave rectifying the voltage generated on the secondary side winding 22 of the transformer, a capacitor 72 for smoothing the rectified voltage, and smoothing at both ends of the capacitor 72.
  • the drive signal is generated and the transformer primary Limit the period for current to flow through the side wire 21 And a control circuit 90.
  • An optical signal transmission element such as a photo force bra is used for a part of the feedback signal path from the secondary side voltage detection circuit 80 to the control circuit 90.
  • the rectifying / smoothing circuit 40 includes, for example, a diode bridge and a capacitor.
  • the AC voltage applied between the input terminal 1 and the input terminal 2 is full-wave rectified by the diode bridge and smoothed by the capacitor. .
  • a forward method that transmits power from the primary side to the secondary side when the switching element is turned on
  • a flyback system that transmits power from the primary side to the secondary side when the switching element is turned off.
  • a flyback method it can be applied to either one, but in the present embodiment, a flyback method is adopted.
  • the primary side winding 21 and the secondary side winding 22 of the transformer have a reverse polarity relationship, and the switching element 50 is turned on. During this time, the primary side current of the transformer 20 increases. On the secondary side of the transformer 20, the secondary side current does not flow because it is reverse-biased by a diode. The transformer 20 stores energy in the core 23 when the switching element 50 is on.
  • FIG. 4 is a circuit diagram showing a configuration example of the secondary side voltage detection circuit and the like shown in FIG.
  • the secondary voltage detection circuit 80 includes a resistor 81, a light emitting diode 82, and a shunt regulator 83 connected between both terminals of the capacitor 72 and a capacitor 72 connected between both terminals.
  • resistors 84 and 85 for dividing the voltage generated in the circuit. The voltage divided by the resistors 84 and 85 is applied to the control terminal of the shunt regulator 83.
  • FIG. 5 is a diagram showing in detail the configuration of the control circuit and the like shown in FIG.
  • an N-channel MOSFET 51 is used as the switching element 50 shown in FIG. 3, and a resistor 61 is used as the primary-side current detection circuit 60 shown in FIG.
  • MOSFET 51 has a drain connected to primary side wire 21 of the transformer, a source connected to rectifying / smoothing circuit 40 via resistor 61, and a gate to which a drive signal is applied from gate driver 96. ing. If the voltage generated at both ends of the resistor 61 is measured, a detection voltage proportional to the current flowing through the primary side wire 21 of the transformer can be obtained.
  • the primary side wire 21 of the transformer, the drain / source path of the MOSFET 51, and the resistor 61 are connected in series, and the voltage obtained by rectifying and smoothing the AC power supply voltage in the rectifying and smoothing circuit 40 is To the series circuit.
  • the MOSFET 51 causes a current to flow through the primary side winding 21 of the transformer in accordance with a pulsed drive signal applied to the gate.
  • the control circuit 90 includes a DSP (Digital Signal Processor) 91 in which control blocks for generating drive signals are integrated, and a non-volatile memory for storing software (control program) and data. And the like, an AZD converter 93 and 94, a photoelectric conversion circuit 95, and a gate driver 96.
  • the storage unit 92 stores a data table, and this data table includes various setting information used for controlling the operation of the switching power supply circuit.
  • the AZD converter 93 converts the analog primary-side current detection signal obtained by the resistor 61 into a digital signal and outputs the digital signal to the DSP 91.
  • a photopower bra is typically used as the light emitting diode 82 (FIG. 4) and the photoelectric conversion circuit 95.
  • the photoelectric conversion circuit 95 receives the optical signal generated by the light emitting diode 82 of the secondary side voltage detection circuit 80 shown in FIG. 4, and outputs a signal corresponding to the intensity. This signal is used as the secondary voltage detection signal.
  • the AZD converter 94 converts the analog secondary voltage detection signal obtained by the photoelectric conversion circuit 95 into a digital signal and outputs it to the DSP 91.
  • the storage unit 92 and the AZD converters 93 and 94 are built in the DSP, and these Parts 91-94 may be configured with a single chip.
  • the DSP 91 performs a pulse width modulation (PWM) based on detection signals output from at least the primary side current detection circuit 61 and the secondary side voltage detection circuit 80 to thereby generate a drive signal (PWM signal). Is generated.
  • PWM pulse width modulation
  • the drive signal is applied to the gate of MOSFET 51 by gate driver 96.
  • FIG. 6 is a flowchart showing an example of the basic control operation of the DSP shown in FIG.
  • FIG. 7 is a graph showing output current output voltage characteristics (secondary current secondary voltage characteristics) of the switching power supply circuit shown in FIG.
  • step S11 the drive signal is controlled so as to perform a constant voltage stabilization operation in which the secondary side voltage represented by the output value of the DSP91 force AZD converter 94 is constant. Control the pulse width. Further, in step S12, the DSP 91 determines whether or not the primary current represented by the output value of the AZD converter 93 exceeds the threshold, and until the primary current exceeds the threshold. Then, the pulse width of the drive signal is controlled so that the constant voltage stable operation is performed.
  • the secondary side current increases, the primary side current reaches the threshold value at point A, and the primary side current becomes the threshold.
  • the DSP 91 keeps the pulse width of the drive signal constant and stops the constant voltage stabilization operation (step S13).
  • step S14 the DSP 91 determines whether or not the number of times that the primary side current exceeds the threshold value within a predetermined period is within an allowable range. If the number of times the primary side current exceeds the threshold value within the predetermined period is within the allowable range, the process proceeds to step S15, and the primary side current exceeds the threshold value within the predetermined period. If the number of times exceeds the allowable range, the process proceeds to step S16.
  • step S15 the DSP 91 determines whether or not the secondary side voltage has dropped below a threshold value. If the secondary side voltage has not fallen below the threshold value, the process proceeds to step S12. If the secondary side voltage has fallen below the threshold value, the process proceeds to step S16. To do.
  • step S16 the DSP 91 may destroy the MOSFET 51 due to current stress, so that the drive signal is deactivated to stop the switching operation of the MOSFET 51, and the current flowing through the primary side wire is cut off. To do.
  • the setting information regarding the threshold value of the primary current the information regarding the threshold value of the secondary voltage, the setting information regarding the allowable range when the primary current exceeds the threshold value, etc.
  • the data is stored in the storage unit 92 in the data table.
  • a force that is electrically controlled to protect circuit elements When amorphous metal is used as a core material of a transformer, it suddenly occurs due to dynamic fluctuations in the load. As a result, overcurrent may flow, and the temperature of the transformer or choke coil winding may momentarily exceed the maximum allowable operating temperature. Therefore, in this embodiment, a protective measure is taken by blowing the thermal fuse 10 included in the magnetic device 100.
  • Fig. 8 (a) is a diagram showing a change in the secondary current of the switching power supply circuit shown in Fig. 3, and Fig. 8 (b) is a diagram showing a change in the winding temperature of the transformer. is there. As shown in Fig. 8 (a), when the secondary current value is between time t and t, the primary side corresponds to the secondary current.
  • the steepness of the temperature rise in the transformer winding is determined by the value of the secondary current and its duration.
  • T indicates the fusing temperature of the thermal fuse! /.
  • the temperature is steep up to the fusing temperature T of the thermal fuse as shown by point E to point F in Fig. 8 (b).
  • the thermal fuse is blown when the ambient temperature (approximately equal to the transformer's shoreline temperature) reaches the fusing temperature T, interrupts the current path on the primary side of the transformer, and generates an overcurrent.
  • a temperature fuse having a fusing temperature T equal to or lower than the Curie point T of the amorphous core.
  • the magnetic device 100 in which the thermal fuse and the transformer are integrated by fixing the soldering wire to the shoreline of the transformer, accidents such as burning and smoke generation due to overcurrent flowing in the shoreline can be prevented.
  • a thermal fuse is connected in series to the primary side of the transformer, but the side of the wire to which the thermal fuse is connected is limited to the primary side. It is not something. Considering the amount of heat generated from the lead wire and the heat capacity of the lead wire, a thermal fuse can be connected in series with the primary side wire, and a thermal fuse can be connected in series with the secondary side wire. May be.
  • FIG. 9 is a diagram showing a configuration of a switching power supply circuit according to the second embodiment of the present invention.
  • the magnetic device 200 shown in FIG. 9 is used instead of the magnetic device 100 shown in FIG. 1, and the control circuit 110 is used instead of the control circuit 90.
  • the rest is the same as the switching power supply circuit shown in Fig. 3.
  • the overcurrent is reduced by controlling the switching element using a temperature sensor 11 such as a thermistor that does not shut off the circuit.
  • the temperature sensor 11 is fixed to the inner side or the outer side of the winding 21 or 22, whereby thermal coupling is achieved between the temperature sensor 11 and the winding.
  • the temperature sensor 11 may be wound around the shoreline near the surface layer of the shoreline 21 or 22.
  • the temperature sensor 11 may be fixed with a tape 12 outside the winding 21 or 22 of the transformer.
  • the temperature sensor 11 detects the temperature of the primary side winding 21 or the secondary side winding 22 of the transformer.
  • a small and highly sensitive thermistor is used as the temperature sensor 11.
  • the temperature sensor 11 is fixed to the transformer winding 21 or 22 with a tape, so that the temperature at the transformer winding can be detected quickly and accurately.
  • a detection result by the temperature sensor 11 is input to the control circuit 110.
  • the secondary voltage characteristics are the same as those shown in Figs.
  • the change in the winding temperature of the transformer accompanying the change in the secondary current is the same as shown in FIG.
  • the temperature detected by 11 is almost equal to the temperature detected by point 11 to point E in Fig. 8 (b). Further, overcurrent I instantaneously flowed from time t to t shown in Fig. 8 (a).
  • the control circuit 110 controls the switching element 50, thereby
  • the predetermined temperature T needs to be lower than the curie point of the core 23 of the transformer.
  • FIG. 11 is a diagram showing in detail the configuration of the control circuit and the like shown in FIG.
  • the configuration of the DSP 91, the storage unit 92, the A / D converters 93 and 94, the photoelectric conversion circuit 95, and the gate driver 96 is the same as the configuration of the control circuit 90 shown in FIG. Also from temperature sensor 11 Are output to the DSP 91 via the AZD converter 97.
  • Thermistors used as the temperature sensor 11 include a type in which the resistance value increases with a rise in temperature (PTC thermistor) and a type in which the resistance value decreases with a rise in temperature (NTC thermistor). There is a type (CTR thermistor) in which the resistance value suddenly decreases when the temperature exceeds a specific temperature (temperature characteristic change point). In this embodiment, the temperature characteristic change point is higher than the curie point of the transformer core 23. A low CTR thermistor is used.
  • MOS FET 51 may be turned off to interrupt the primary current path!
  • the primary circuit is cut off against an overcurrent caused by a dynamic change in the load without damaging the magnetic device, thereby preventing an accident such as burnout of the transformer winding. be able to.
  • FIG. 12 is a diagram showing a configuration of a switching power supply circuit according to the third embodiment of the present invention.
  • This switching power supply circuit includes a PFC circuit 120 that is connected to AC power supply voltage input terminals 1 and 2 to improve the power factor, and a voltage conversion circuit 130 that obtains a desired output voltage.
  • the configuration of the voltage conversion circuit 130 is the same as that of the switching power supply circuit shown in FIG. 9 except that the rectifying / smoothing circuit 40 does not exist. However, in FIG. 12, the temperature sensor 11 is connected to the PFC circuit 120.
  • FIG. 13 is a diagram showing a configuration example of the PFC circuit shown in FIG.
  • the PFC circuit 120 includes a rectifier circuit 140 connected to AC voltage input terminals 1 and 2, and a choke coil 150 that is connected at one end to the rectifier circuit 140 and stores magnetic energy generated by the current flowing in the winding in the core. Connected to the other end of the choke coil 150 and A switching element 160 that allows current to flow through the yoke coil 150 and a switching current detection circuit 170 that detects current flowing through the switching element 160 are included.
  • the primary side of the transformer is used as the choke coil 150
  • the secondary side of the transformer can be used for generating an internal power source.
  • the PFC circuit 120 includes a diode 161 that half-wave rectifies the voltage generated at the other end of the choke coil 150, and generates a PFC output voltage by smoothing the rectified voltage to generate a PFC output terminal.
  • the capacitor 162 supplied to 5 and 6 has an output voltage detection circuit 180 for detecting the PFC output voltage at the PFC output terminals 5 and 6, and a control circuit 190 for setting the pulse width of the drive signal.
  • the rectifier circuit 140 is configured by, for example, a diode bridge, and full-wave rectifies the AC voltage applied between the input terminal 1 and the input terminal 2.
  • the choke coil 150 stores energy in the core when the switching element 160 is on. Next, when the switching element 160 is turned off, the magnetic field tries to maintain the current, so that the current of the choke coil 150 flows to the capacitor 162 through the diode 161 and is charged by the capacitor 162, so that the output terminal 5 DC output voltage is generated between output terminal 6 and output terminal 6.
  • the configurations and operations of the switching current detection circuit 170 and the output voltage detection circuit 180 are the same as those of the primary side current detection circuit 60 and the secondary side voltage detection circuit 80 shown in FIG.
  • the configuration and operation of the control circuit 190 are the same as those of the control circuit 110 shown in FIG. However, in FIG. 13, since the signal fed back from the output voltage detection circuit 180 to the control circuit 190 is an electrical signal, the photoelectric conversion circuit 95 shown in FIG. 11 is omitted.
  • a temperature detection signal generated by the temperature sensor 11 shown in FIG. 12 is input to the control circuit 190 shown in FIG.
  • the DSP in the control circuit 190 processes the temperature detection signal converted into the digital signal as a high-priority interrupt signal, and the temperature represented by the temperature detection signal is changed.
  • a drive signal is generated so as to limit
  • the change in the secondary current with respect to the dynamic fluctuation of the load and the change in the winding temperature of the transformer accompanying it are the same as shown in Fig. 8.
  • the temperature sensor 11 detects the winding temperature of the transformer, and the control circuit 110 controls the switching element 50 connected in series to the primary side winding 21 of the transformer.
  • the control circuit 190 controls the switching element 160 in the PFC circuit 120 installed in the previous stage of the voltage conversion circuit 130. . This can also prevent accidents such as burnout of the transformer winding due to overcurrent.
  • FIG. 14 is a diagram showing a configuration of a magnetic device according to the third embodiment of the present invention.
  • the force in which one end of the thermal fuse 10 is connected to one end of the primary side winding 21 of the transformer is applied to the magnetic device 300 according to the present embodiment. ! /, One end of the thermal fuse 10 is connected to one end of the winding of the choke coil 30.
  • the magnetic device 300 has a first terminal 301 connected to the other end of the thermal fuse 10 and a second terminal 302 connected to the other end of the winding of the choke coil 30. Yes.
  • the primary side of the transformer may be used as the choke coil 30, and the secondary side of the transformer may be used for generating an internal power source such as a switching power supply circuit.
  • the shape of the magnetic device 300 is the same as that described with reference to FIGS. 2A and 2B, except for the number of windings. That is, the thermal fuse 10 is fixed to the inner side or the outer side of the shoreline of the choke coil 30, thereby achieving thermal coupling with the shoreline.
  • the temperature fuse 10 may be wound near the surface of the shoreline of the choke coil 30!
  • the thermal fuse 10-power choke coil 30 may be fixed to the outside of the winding by a tab.
  • a magnetic material of amorphous metal is used as the core material of the choke coil 30. If overcurrent flows in the shoreline of the choke coil 30, the temperature fuse 10 is melted by the heat generation of the shoreline of the choke coil 30 in addition to the heat generation of the temperature fuse 10 itself, and the input terminal 301 and the choke coil 30 By interrupting the current path to the shoreline, it is possible to prevent accidents such as burning of the shoreline insulation film and smoke generation due to heat generation.
  • the temperature at which the thermal fuse 10 is blown (melting temperature) is applied to the core of the choke coil 30. It is set to be lower than the curie point of the amorphous metal used. Amorphous metal magnetics crystallize as the temperature rises, and when the temperature exceeds the Curie point, they lose their amorphous characteristics, and even if the temperature is lowered below the Curie point again, it is amorphous. Does not restore quality as a property. Therefore, the magnetic characteristics of the amorphous metal can be maintained by setting the fusing temperature of the thermal fuse 10 as described above.
  • FIG. 15 is a diagram showing a configuration of a switching power supply circuit according to the fourth embodiment of the present invention.
  • the switching power supply circuit according to the present embodiment includes a rectifying / smoothing circuit 40 connected to the input terminals 1 and 2 of the AC power supply voltage, a voltage converting circuit 210 for converting the voltage output from the rectifying / smoothing circuit 40, and a desired frequency.
  • Inverter circuit 220 that outputs an AC voltage having a ⁇ 1 ”control circuit 230 is included.
  • the voltage conversion circuit 210 is connected to the magnetic device 300 having the first terminal 301 connected to the rectifying and smoothing circuit 40 and the second terminal 302 of the magnetic device 300, and magnetically follows the pulsed drive signal.
  • the transistor 300 includes a transistor 241 that supplies current to the device 300 and a switching current detection circuit 250 that detects the current flowing through the transistor 241.
  • the primary side of the transformer is used as the choke coil 30, the secondary side of the transformer can be used for generating the internal power supply.
  • the voltage conversion circuit 210 generates the output voltage by rectifying and smoothing the voltage generated at the other end of the choke coil 30, and supplies the output voltage to the output terminals 7 and 8 of the voltage conversion circuit. 243 and an output voltage detection circuit 260 for detecting the output voltage at the output terminals 7 and 8.
  • the collector of the transistor 221 is connected to the output terminal 7 of the voltage conversion circuit 210, and the emitter is connected to the output terminal 4.
  • the collector of the transistor 222 is connected to the output terminal 4, and the emitter is connected to the output terminal 8 of the voltage conversion circuit 210.
  • the collector of the transistor 223 is connected to the output terminal 7, and the emitter is connected to one end of the coil 225.
  • the collector of the transistor 224 is connected to one end of the coil 225, and the emitter is connected to the output terminal 8 of the voltage conversion circuit 210.
  • Coil 22 The other end of 5 is connected to the output terminal 3.
  • a capacitor 226 is connected between the output terminals 3 and 4.
  • the control circuit 230 generates a drive signal to be supplied to the transistor 241 that performs the switching operation based on the detection result of the switching current detection circuit 250 and the detection result of the output voltage detection circuit 260.
  • a plurality of control signals output from the control circuit 230 are supplied to the bases of the transistors 221 to 224 to perform switching control of the respective transistors.
  • the DC voltage output from the voltage conversion circuit 210 is converted into an AC voltage and output from the output terminals 3 and 4.
  • choke coil 30 of magnetic device 300 stores energy in the core when transistor 241 is on. Next, when the transistor 241 is turned off, the magnetic field tries to maintain the current, so that a current flows from the choke coil 30 to the capacitor 243, and the capacitor 243 is charged, so that the output terminal 7 and the output terminal 8 are connected. Generate DC output voltage.
  • the switching element The peak current flowing through the can be increased. Further, by using the fuse 10 fixed to the winding of the choke coil 30, when the temperature of the winding rises and reaches the fusing temperature T of the thermal fuse 10, the thermal fuse 10 is
  • FIG. 16 is a diagram showing a configuration of a switching power supply circuit according to the fifth embodiment of the present invention.
  • the magnetic device 400 shown in FIG. 16 is used instead of the magnetic device 300 shown in FIG. 15, and the control circuit 270 is used instead of the control circuit 230.
  • the switching power supply circuit (excluding the inverter circuit) shown in Figure 15
  • the magnetic device 300 When using the magnetic device 300 in which the thermal fuse is fixed to the shoreline of the choke coil as shown in FIG. 15, the magnetic device 300 is replaced when the thermal fuse is blown by the temperature rise due to overcurrent. Need to be repaired. Therefore, this embodiment In this state, the switching element is controlled using a temperature sensor 11, such as a thermistor, that does not shut off the circuit using a temperature fuse connected in series with the winding against the temperature rise caused by overcurrent. By doing so, the overcurrent is reduced.
  • a temperature sensor 11 such as a thermistor
  • the temperature sensor 11 is fixed inside or outside the winding of the choke coil 30, so that thermal coupling with the winding is achieved. It has been.
  • the temperature sensor 11 may be wound on the winding near the surface of the winding of the choke coil.
  • the temperature sensor 11 may be fixed to the outside of the choke coil with tape 12.
  • the temperature sensor 11 detects the temperature of the winding of the choke coil 30.
  • the detection result by the temperature sensor 11 is input to the control circuit 270.
  • the configuration and operation of the control circuit 270 are the same as those of the control circuit shown in FIG.
  • the control circuit 270 causes the transistor 24 to
  • the duty of the drive signal supplied to 1 is reduced, and the current flowing through the winding of the choke coil 30 is limited.
  • the transistor 241 may be turned off to interrupt the current path of the choke coil 30.
  • the switching circuit is shut off against overcurrent caused by dynamic fluctuations in the load without damaging the magnetic device, and accidents such as burnout of the choke coil winding are prevented. Can do.
  • FIG. 17 is a sectional view of a magnetic device according to the fifth embodiment of the present invention.
  • the magnetic device according to this embodiment has a structure in which a primary side winding core and a secondary side winding core are separated.
  • a magnetic device using a rotary transformer generally used for a video tape recorder or the like will be described as an example.
  • the rotary transformer 230 includes a rotating shaft 231 connected to a rotating drum unit (not shown), a rotor 2 32 fixed to the rotating shaft 231 and rotating together with the rotating shaft 231, and a rotor 232 and a stator 233 on the stationary side facing each other through a gap.
  • coil grooves 234 and 235 are formed in a circumferential region around the rotation shaft 231.
  • the primary side wire 21 is wound around the coil groove 235.
  • the coil 232 has coil grooves 236 and 237 formed in a circumferential region around the rotation shaft 231.
  • the secondary side winding 22 is wound around the coil groove 237.
  • the coil grooves facing each other for example, the coil groove 234 and the coil groove 236 have the same width.
  • at least a part of the circumference of the coil groove 235 formed in the stator 233 has a width wider than that of the opposing coil groove 237.
  • the thermal fuse 10 is housed there.
  • the thermal fuse 10 is connected in series between the primary side terminal 101 and the primary side wire 21 as shown in FIG.
  • the rotary transformer 230 transmits an electrical signal from the stator 233 side to the rotor 232 side or from the rotor 232 side to the stator 233 side.
  • the equivalent circuit of the rotary transformer 230 is the same as that of the magnetic device 100 shown in FIG. 1, except for the auxiliary feeder 25, and the operation of the thermal fuse 10 is the same as that of the thermal fuse 10 shown in FIG.
  • a temperature sensor may be provided instead of the temperature fuse 10.
  • the temperature sensor is not connected to the primary side wire 21.
  • the operation of the temperature sensor in the present embodiment is the same as the operation of the temperature sensor 11 shown in FIG.
  • the magnetic device according to this embodiment can be applied to a coupler or the like used for supplying energy by electromagnetic coupling in an electric vehicle.
  • FIG. 2A The configuration in which the thermal fuse as described in FIG. 1 is connected in series between the primary side terminal of the transformer and the primary side or the secondary side is as described in FIG. 2A.
  • the present invention is not limited to a transformer composed of a core, bobbin, primary side winding and secondary side winding.
  • the primary side conductor and the secondary side conductor are not connected to the transformer of the type shown in Fig. 2A.
  • Sheet transformers configured as patterns and secondary conductor patterns may be used. Even in such a type of transformer, when a thermal fuse is connected as shown in FIG. 1, when the current flowing through the primary conductor pattern or the secondary conductor pattern reaches a predetermined value, the thermal fuse The circuit can be shut off by the heat generated by the operation. In that case, heat generation due to electric current is quickly and reliably
  • the choke coil configuration shown in FIG. 14 is also applied to a sheet type choke coil in which the winding is configured as a conductor pattern in the front and back layers or the inner layer of the multilayer substrate, as in the case of the sheet transformer.
  • the present invention can be used for a magnetic device including a transformer or choke coil having a magnetic core, and a switching power supply circuit using such a magnetic device.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Regulation Of General Use Transformers (AREA)

Abstract

L'invention concerne un dispositif magnétique qui peut empêcher un accident exothermique grâce à l'utilisation d'une substance magnétique présentant une densité de flux magnétique à haute saturation et une excellente dispersion thermique comme le noyau d'un transformateur ou d'une bobine d'arrêt et par détection rapide et précise de l'élévation de température d'un enroulement, provoquée par la circulation d'un courant excessif au travers de l'enroulement. Le dispositif magnétique comprend : (a) un transformateur incluant un noyau contenant la substance magnétique du métal amorphe et un groupe d'enroulements comportant un enroulement primaireet un enroulement secondaire sur le noyau, (b) un ensemble de bornes primaires et un ensemble de bornes secondaires et, (c) un fusible relié en série soit entre une borne de l'enroulement primaire du transformateur et l'une des bornes du primaire d'un ensemble, soit entre une borne de l'enroulement secondaire du transformateur et l'une des bornes du secondaire d'un ensemble, fixé sur le côté intérieur ou sur le côté extérieur du groupe d'enroulements, et coupé à une température inférieure à celle du point de Curie du métal amorphe.
PCT/JP2007/061196 2006-06-09 2007-06-01 Dispositif magnétique, circuit de source de puissance à découpage utilisant le dispositif et procédé de commande pour le circuit Ceased WO2007142143A1 (fr)

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JP2006-161458 2006-06-09
JP2006161458A JP2007330086A (ja) 2006-06-09 2006-06-09 磁気デバイス、並びに、それを用いたスイッチング電源回路及びその制御方法

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CN115356666A (zh) * 2022-08-03 2022-11-18 贵州电网有限责任公司 一种单相隔离防雷装置熔丝断线的判断方法
CN117120716A (zh) * 2021-05-27 2023-11-24 日立安斯泰莫株式会社 内燃机控制装置以及点火机构的控制方法

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JP5120551B2 (ja) * 2008-03-24 2013-01-16 東芝ライテック株式会社 基板装置および照明装置
DE102010000939A1 (de) * 2010-01-15 2011-07-21 Tridonic Ag Leuchtmittel-Betriebsgerät mit temperaturabhängiger Schutzschaltung
CN102226968B (zh) * 2011-03-24 2012-10-03 常州市林科电器有限公司 电源专用变压器
JP7059759B2 (ja) * 2018-03-30 2022-04-26 Tdk株式会社 コイルユニット、ワイヤレス送電装置、ワイヤレス受電装置及びワイヤレス電力伝送システム

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JPS59175331A (ja) * 1983-03-23 1984-10-04 キヤノン株式会社 電源装置
JPH028119U (fr) * 1988-06-29 1990-01-19
JPH04273412A (ja) * 1991-02-28 1992-09-29 Nippon Denki Musen Denshi Kk 高周波電力用トランス
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CN117120716A (zh) * 2021-05-27 2023-11-24 日立安斯泰莫株式会社 内燃机控制装置以及点火机构的控制方法
CN115356666A (zh) * 2022-08-03 2022-11-18 贵州电网有限责任公司 一种单相隔离防雷装置熔丝断线的判断方法

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