JP3473509B2 - Switching regulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a switching regulator having a feedback and feedforward control circuit, and more particularly to a step-up switching regulator for boosting and outputting an input voltage.

[0002]

2. Description of the Related Art Switching regulators include a non-boost type and a boost type. The non-step-up type outputs substantially the same voltage as the input voltage, whereas the step-up type outputs by boosting the input voltage and outputting. Hereinafter, these will be described in order.

FIG. 13 is a configuration diagram illustrating a conventional non-boosting type switching regulator. In the figure, 1 is a DC power supply, Vi is an input voltage from the power supply 1, 2 is a switch for chopper, 3 is a switch driver for driving the chopper switch 2, 4 is a choke coil for filtering, 5 is a capacitor for filtering. , 6 are rectifying diodes, 7 is an output terminal for outputting a constant voltage, 16 is a load connected to the output terminal 7, Vo is the output voltage of the output terminal 7,
Reference numeral 8 denotes an input voltage detection unit that includes voltage dividing resistors 8a and 8b and detects an input voltage Vi. 9 denotes voltage dividing resistors 9a and 9
b, an output voltage detection unit for detecting the output voltage Vo
Reference numeral 0 denotes a control unit, which includes a triangular wave generation circuit 11 and an error amplifier 1
2, a comparator 13 and a switch driving unit 3. In addition,
Input voltage detection unit 8 outputs a voltage v _in which dividing the input voltage Vi divided, the output voltage detecting unit 9 outputs a voltage v _out obtained by dividing the output voltage Vo min. The input voltage Vi from the DC power supply 1 includes a ripple (ie, an AC component).
FIG. 14 is a waveform diagram illustrating an input voltage Vi including a ripple. In the figure, the horizontal axis represents time, and the vertical axis represents the input voltage Vi.

Next, the operation will be described. Control unit 10 shown in FIG. 13, controls the switch 2 based on the voltage v _out from the voltage v _in and the output voltage detection unit 9 from the input voltage detection unit 8. For example, when the output voltage Vo is determined to be excessive, feedback control is performed to reduce the on-time of the switch 2, and when it is determined to be excessively small, to increase the on-time. In addition, when the input voltage Vi is determined to be excessive, the on-time of the switch 2 is reduced, and when it is determined to be excessively small, the feed-forward control is performed to increase the on-time. In addition to the feedback and feedforward control, the ripple included in the input voltage Vi can be removed by the smoothing action of the choke coil 4, the capacitor 5, and the diode 6, and a stable DC output voltage Vo can be obtained.

The operation of the control unit 10 shown in FIG. 13 will be described in more detail. Triangular wave generating circuit 11 generates a triangular wave v ₁ on the basis of the voltage v _in from the input voltage detection unit 8, and outputs to the comparator 13. FIG. 15 is a configuration diagram of the triangular wave generation circuit. 15, 14 is an integrator which integrates the voltage v _in from the input voltage detection unit 8, 15 is an integrator at the same frequency as the chopping cycle of the switch 2 14
Reset circuit. On the other hand, the error amplifier 12 shown in FIG.
amplifying the difference between _out and the reference voltage Vref, and outputs a voltage v _2. The comparator 13 compares the output v ₂ of the output v ₁ and the error amplifier 12 of the triangular wave generating circuit 11, the switch driving when the output v ₂ of the error amplifier 12 is greater than the output v ₁ of the triangular wave generating circuit 11 The drive pulse v ₃ is output to the section 3.

FIG. 16 is an explanatory diagram illustrating the operation of the comparator 13. Here, for simplicity, a triangular wave generation circuit 1
FIG. 16A shows a case where the voltage vin input to 1 changes _in two values (FIG. 16A). When the voltage v _in to be input to the triangular wave generation circuit 11 changes as shown in FIG. 16 (a), the slope of the output v ₁ of the triangular wave generating circuit 11 changes as shown in FIG. 16 (b). The comparator 13 compares the output v ₁ with the output v ₂ of the error amplifier 12 (FIG. 16B), and outputs a pulse v ₃ when the output v ₂ is larger (FIG. 16).
(C)). That is, the time width is shortened As the input voltage Vi and output voltage Vo becomes larger (smaller) (longer) for generating a pulse v _3. Thereby, the input voltage V
i and the output voltage Vo can be controlled to be constant values, and the ripple can be reduced.

Incidentally, there is a step-up switching regulator as a circuit using a similar switching regulator system. The difference is that the non-boost regulator shown in FIG. 13 outputs substantially the same voltage as the input voltage, whereas the boost regulator boosts and outputs the input voltage.

FIG. 17 is a configuration diagram showing a basic configuration of a conventional step-up switching regulator. FIG. 1
The same or corresponding portions as in FIG. 3 are denoted by the same reference numerals, and description thereof is omitted. In FIG. 17, 17 is a choke coil, 1
Reference numeral 8 denotes a switch, and when the switch 18 is turned on, a closed circuit passing through the power supply 1, the choke coil 17, and the switch 18 is formed. On the other hand, when the switch 18 is off, a closed path passing through the power supply 1, the choke coil 17, the diode 6, and the load 16 is formed. The diode 6 and the capacitor 5 rectify and smooth the current.

Next, the operation will be described. Switch 18
Is turned on, energy is stored in the choke coil 17. Subsequently, when the switch 18 is turned off, the energy stored in the choke coil 17 is changed to the input voltage V.
i and is output from the output terminal 7. This makes it possible to output an output voltage Vo that is higher than the input voltage Vi. More specifically, the switch 18
(I.e., continuous on / off operation of the switch) is sufficiently fast and the current flowing through the choke coil 17 is continuous, the inductance of the choke coil 17 is L, the on time of the switch 18 is T _ON , Similarly, assuming that the _OFF time is T _OFF , Vo = ((T _ON + T _OFF )
/ T _OFF ) · Vi.

Although the basic configuration of the conventional boost regulator has been described above with reference to FIG. 17, feedback control for stabilizing the output voltage Vo to a target value is actually required similarly to the non-boost regulator. is there. Further, it is preferable to perform feedforward control in order to further suppress the ripple included in the output voltage Vo.

[0011]

As described above, a control unit 10 shown in FIG. 13 is known as a feedforward and feedback control circuit applied to a non-boost regulator.

However, since the circuit operation of the non-boost regulator as shown in FIG. 13 is significantly different from that of the boost regulator as shown in FIG. 17, the control circuit applied to the non-boost regulator is directly boosted. Even when applied to a mold regulator, a sufficient ripple suppression effect is not always obtained.

For example, in the non-boost regulator shown in FIG. 13, when the switch 2 is turned off, the power supply from the power supply 1 is stopped, whereas in the boost regulator shown in FIG. The circuit operation is greatly different, for example, the power supply to the choke coil 17 continues even when the power is off. In addition, in the step-up regulator of FIG. 17 , since the input and output cannot be insulated, it is susceptible to load fluctuations, and it is difficult to stabilize the output voltage.
In particular, at a light load, the output voltage tends to be unstable.

For these reasons, in a step-up switching regulator, it is required that the feedforward and feedback control circuits operate at a particularly high speed. However, since the control unit 10 shown in FIG. 13 includes a circuit that operates slowly, such as the error amplifier 12 (that is, the operational amplifier), even if the control unit 10 is used as a control unit of a step-up switching regulator. , stabilization of the output voltage was not sufficient.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a switching regulator having an extremely stable output voltage by providing a feedback and feedforward circuit having a high operation speed. And

[0016]

A switch according to the present invention
Regulator stores the energy of the input voltage.
Inductor that emits the energy of
An output that stores energy and is boosted above the input voltage
Capacitor to maintain voltage and above inductor when ON
When the accumulation of energy in the
A switch that controls the release of energy and the input voltage
Input voltage detector to detect and magnitude of this input voltage
ON signal with time width of inverse correlation and OFF with time width of positive correlation
Switch signal generator for generating a switch signal having a signal
An output voltage detecting section for detecting the output voltage;
Comparison between the detected output voltage level and the output voltage reference value
A comparison unit, and based on the comparison, the magnitude of the detected output voltage.
Switch is smaller than the output voltage reference value.
If the detected output voltage is larger than the output voltage reference value
If it is larger, the OFF signal is
And a driving unit that outputs the data.

Further , according to the switching regulator of the present invention,
The switch signal generator generates the input voltage.
The first comparator to which the divided voltage and the triangular wave are input
And the comparing section detects the divided voltage of the output voltage and the base voltage.
A second comparator to which a reference voltage is input;
Unit connects the output sides of the first and second comparators
The above based on the voltage generated at the connection
Drive the switch.

Further, according to the switching regulator of the present invention,
The divided voltage of the output voltage exceeds the reference voltage.
Output overvoltage that integrates time and outputs the integration result as voltage
A time detection circuit, a divided voltage of the input voltage and the output
A voltage addition circuit for adding the output voltage of the voltage time detection circuit;
Wherein the switch signal generation unit is configured to include the voltage addition circuit
First comparator to which the addition result and the triangular wave are input
Wherein the comparing section outputs a divided output of the output voltage and
A second comparator to which the reference voltage is input;
The driving unit is connected to an output side of the first and second comparators;
Are connected to each other based on the voltage generated at the connection.
Drive the switch.

Further, the switching regulator according to the present invention
The divided voltage of the input voltage is a resistor and a diode.
Input voltage using a voltage divider circuit consisting of
And the voltage drop across the diode.
Below, the pulse width of the switch signal is approximately equal to the input voltage.
Set to be inversely proportional.

Further, the switching regulator according to the present invention
The resistor has one end connected to the output section of the output voltage and a resistor
And the other end of the coupling circuit consisting of a capacitor connected in series.
Output voltage and the divided voltage of the input voltage.
A voltage adding circuit, wherein the switch signal generation unit
The sum of the voltage adding circuit and the triangular wave
1 comparator, wherein the comparing unit outputs the output voltage
Divided output voltage and reference voltage are input
A second comparator, wherein the driving unit is configured to control the first and the second comparators.
And the output of the second comparator.
Drive the switch based on the voltage generated at the connection
You.

Further, the switching regulator according to the present invention
The divided voltage of the input voltage is equal to the input voltage.
In the series circuit of the first resistance element and the coupling capacitor.
A third resistor is directly connected to a circuit formed by connecting two resistors in parallel.
The voltage is divided by a circuit connected in columns.

The switching regulator according to the present invention
The accumulator stores the energy of the input voltage and
Inductor and the energy released
The product a boosted output voltage than accumulation to the input voltage
And the energy to the inductor
Energy from the inductor when the energy storage is turned off.
A switch for controlling emission and an input for detecting the input voltage.
Based on the magnitude of the input voltage
A first component for outputting a switch signal for driving the switch.
A parator and an output voltage detector for detecting the output voltage
And the magnitude of the detected output voltage is compared with the output voltage reference value.
The voltage at the output section changes according to the comparison result.
An output of the first comparator.
Connected to the output section of the second comparator.
You.

Further, the switching according to the present invention
The regulator connects the first comparator to the input power.
First comparator to which the divided voltage of the voltage and the triangular wave are inputted
It is a thing that I did.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. The same or corresponding parts as those in the related art are denoted by the same reference numerals, and description thereof is omitted.

Embodiment 1 Embodiment 1 describes an example in which the feedforward and feedback control circuit according to the present invention is applied to the boost regulator shown in FIG.

FIG. 1 is a configuration diagram illustrating a step-up regulator according to the first embodiment of the present invention. In the figure, 19 is a triangular wave generator, height (level), the width of the triangular wave V _T periodically generate equal. 20 is a comparator compares the voltage v _in from the triangular wave V _T and the input voltage detection unit 8, and outputs the voltage V _4. A comparator 21 compares the voltage v _out from the output voltage detector 9 with the reference voltage Vref and outputs a voltage V ₅ . A switch driving unit 3 drives the switch 18 based on the input voltage (V ₆ ). The output unit (V ₄₎ of the comparator 20, the output of the comparator 21 (V _5), and the input unit of the switch driver 3 (V ₆₎ are connected. FIG.
An FET (field effect transistor) is used as an example of the switch 18 shown in FIG.

Here, an example of a general comparator used in the comparators 20 and 21 will be briefly described. FIG. 7A is a circuit diagram illustrating a general comparator. In FIG, E _in the input voltage applied to the positive input terminal of the comparator, Eref is input voltage applied to the negative input terminal of the comparator, E
_out is the voltage at the output of the comparator. FIG.
(B) is a waveform diagram illustrating the operation of the comparator. In FIG. 7B, the same or corresponding parts as those in FIG. 7A are denoted by the same reference numerals. Output voltage Eout of the comparator as shown in FIG. 7 (b), rises in the case of (the input voltage E _in> reference voltage Eref) (hereinafter, referred to as a high level), the reverse (the reference voltage Eref> Input Voltage In the case of E _in ), it is lowered or grounded (hereinafter referred to as low level). Here, V _H is the output voltage of the comparator at the high level, _VL is the output voltage at the low level, and the voltage V _H
> Voltage _VL . The operation of the comparator is faster than that of the operational amplifier.

Next, the operation of the circuit shown in FIG. 1 will be described. Divided voltage v _in the input voltage detection unit 8 detects are inputted to the negative input terminal of the comparator 20. Further, the triangular wave V _T of the triangular wave generator 19 has generated is input to the positive input terminal of the comparator 20. Comparator 20 compares these input triangular wave V _T and the divided voltage v _in, the output V ₄ to a high level when the voltage of the triangular wave V _T is higher than the divided voltage v _in. Conversely, the output V ₄ at a low level if it is lower. FIG. 8 is a waveform chart for explaining the operation of the comparator 20. As shown in FIG. 8, the comparator 20 has a pulse width of voltage v
substantially in proportion to produce a narrower pulse signal V ₄ to _in.

On the other hand, the divided voltage v _out from the output voltage detector 9 shown in FIG. 1 is input to the minus input terminal of the comparator 21. The reference voltage Vref is input to the plus input terminal of the comparator 21. The output of the comparator 21 is an open-collector, and compares these input divided voltage v _out and the reference voltage Vref, (divided voltage v _out> reference voltage Vref) low level output V ₅ when the ( the short circuit), in the opposite case the output V ₅ to the high level (open). Thus, when the output voltage Vo becomes higher than the set voltage, forcibly removed the input pulse signal V ₄ to the switch driving section 3.

That is, the output V ₄ of the comparator 20 and the comparator 2
Although both of the first output V ₅ voltage V ₆ that is inputted to the switch driving section 3 becomes high level when the high level, when either the output V ₄ or V ₅ is at a low level , voltage V ₆ is at a low level. FIG. 9 is a waveform diagram illustrating the voltage V ₆ input to the switch driving unit 3. As described above, during the period in which the output voltage v _out of the output voltage detection unit 9 is higher than the reference voltage Vref, the output pulse V ₄ of the comparator 20 is forcibly cut off, and the input voltage V ₆ to the switch driving unit 3 is cut off. Is the ground voltage.

As described above, the step-up regulator of the first embodiment cuts off the switch drive pulse whose time width changes based on the input voltage Vi based on the output voltage Vo. The operation of the circuit is performed at high speed, and a stable output voltage with little ripple can be obtained.

Further, by performing feedback control of the drive pulse output from the feedforward circuit without using an error amplifier, it is possible to obtain a switching regulator with a more stable output voltage.

Further, by connecting the output of the comparator to which the output voltage and the reference voltage are input to the output of the comparator which outputs the switch drive pulse, particularly high-speed feedforward and feedback control can be performed, and the output A switching regulator with a stable voltage can be obtained.

Further, since the speed of the feedforward and feedback control is increased, a switching regulator having a stable output voltage can be obtained even when the load is light and the load fluctuates rapidly.

Further, since the speed of the feedforward and feedback control is increased as described above, a sufficient ripple suppression effect and output stability can be obtained even in a boosting type switching regulator in which it is difficult to stabilize the output voltage. Can be.

Further, since the pulse width is controlled in accordance with the input voltage, it is possible to obtain a switching regulator that functions as a constant voltage DC power supply over a wide input voltage range.

Further, a transformer circuit has conventionally been used as a step-up power supply having a stable output voltage. However, the output voltage can be sufficiently stabilized even in a step-up switching regulator system not using a transformer. Therefore, a small and inexpensive boost type power supply can be obtained.

Embodiment 2 FIG. 2 is a circuit diagram illustrating a configuration of a step-up regulator according to a second embodiment of the present invention. In addition, about the part equivalent to what was demonstrated so far, the same code | symbol is attached | subjected and description is abbreviate | omitted.

In FIG. 2, reference numeral 22 denotes an output overvoltage time detecting circuit for detecting and integrating the time when the output voltage Vo exceeds the set voltage, and includes a comparator 24, a feedback resistor 25, a resistor 26, and a capacitor 27, which will be described later. Is done. Comparator 24
Output voltage v of the output voltage detector 9
_out is input, and the same reference voltage Vref as the comparator 21 is input to the minus input terminal. 25 is a feedback resistor, one end of which is connected to the output of the comparator 24, and the other end of which is connected to the minus input terminal of the comparator 24. A capacitor 27 has one end connected to the output of the comparator 24 via the resistor 26 and the other end electrically grounded. The voltage stored in the capacitor 27 is output to the adder circuit 23 to be described later as the output voltage V ₇ output overvoltage time detecting circuit 22. 23 is a divided voltage v _in an adding circuit for outputting a voltage V ₈ by adding the voltage V ₇ from the output overvoltage time detecting circuit 22 from the input voltage detection unit 8. In the first embodiment described above, although the negative input terminal of the comparator 20 is input divided voltage v _in, the output voltage V ₈ of the adder circuit 23 in the second embodiment is input .

Next, the operation will be described. The output overvoltage time detection circuit 22 shown in FIG. 2 compares the detection voltage v _out from the output voltage detection unit 9 with the reference voltage Vref by the comparator 24, and integrates the comparison result by the capacitor 27. The voltage of the capacitor 27 as the output voltage V ₇ of the detection circuit 22 to the summing circuit 23. This integration process is for temporally smoothing the comparison result.

The adder circuit 23 receives the output voltage v voltage V ₈ obtained by adding the _in the voltage V ₇ which is input an input voltage detection unit 8 to the negative input terminal of the comparator 20. FIG. 10 is a waveform diagram illustrating the operation of the boost regulator according to the second embodiment of the present invention. 3A is a waveform diagram showing two voltages input to the comparator 24 shown in FIG. 2, that is, a detection voltage v _out of the output voltage detection unit 9 and a reference voltage Vref. FIG. 10B is a waveform diagram showing the voltage V ₇ output from the output overvoltage time detection circuit 22. FIG.
0 (c) is a waveform diagram showing a detection voltage v _in the input voltage detection unit 8. FIG. 10D is a waveform diagram showing the voltage V ₈ input to the comparator 20. Furthermore, FIG.
(E) is a waveform diagram showing the voltage V ₄ outputted from the comparator 20.

It is needless to say that the output voltage V ₄ of the comparator 20 is cut off by the output of the comparator 21 as in the first embodiment.

With the above-described configuration of the step-up regulator of the second embodiment, the pulse width supplied to the switch drive unit 3 is reduced according to the time when the output voltage Vo exceeds the set voltage. Since the feedback control can be performed, the output voltage Vo can be further stabilized.

Embodiment 3 FIG. In the third embodiment, an example in which a diode is connected in series to the input voltage detection unit 8 shown in FIG. 1 will be described. FIG. 3 is a circuit diagram illustrating the configuration of a boost regulator according to Embodiment 3 of the present invention. In the following description, portions that are the same as those described above are given the same reference numerals, and description thereof is omitted.

In the step-up regulator shown in FIG. 3, a diode 28 is connected in series with the voltage dividing resistors 8a and 8b, so that the detection voltage v
_In can be offset by the voltage drop V _D of the diode 28. Thus, the operating point of the comparator 20 can be easily adjusted. Note that a constant voltage element such as a Zener diode may be used instead of the diode 28 shown in FIG.

[0046] Also, by selecting the voltage drop V _D of the diode 28 so that the pulse width of the pulse signal V ₄ in inverse proportion to the input voltage Vi changes, can be carried out ideally close feedforward control. That is, since the drive pulse width of the switch 18 changes in inverse proportion to the input voltage Vi, the change in the input voltage Vi hardly affects the output voltage Vo, and the ripple can be suppressed.

[0047] FIG. 11 (a) is a waveform diagram illustrating the output voltage v _in the input voltage detection unit 8 shown in FIG. For comparison, the output voltage vin _{in the} circuit shown in FIG.
together shown as _{in (Yes data Bu Ioto Bu),} shown as the circuit shown in FIG. 1 (i.e., the circuit which does not use the diode 28) the output voltage v _in the v _{in (Not determined Bu Ioto Bu).} Thus, by using the diode 28, it is possible to increase the output voltage v _in the input voltage detection unit 8.
Note that for simplicity, the output voltage v _in shall not include the ripple.

[0048] FIG. 11 (b) is a waveform diagram illustrating the pulse comparator 20 is generated on the basis of the output voltage v _in shown in FIG. 11 (a). By using the diode 28 in this manner, the output pulse width of the comparator 20 can be reduced.

Since the step-up regulator according to the third embodiment is configured as described above, the output pulse width of the comparator can be adjusted without changing the design of the comparator 20, and the output voltage is stabilized. This makes it possible to easily design the boosted regulator.

Embodiment 4 FIG. 4 is a circuit diagram illustrating a configuration of a boost regulator according to a fourth embodiment of the present invention. 4, the positions of the FET 18 and the choke coil 17 shown in FIG. 1 are interchanged, and the direction of the diode 6 is reversed. This makes it possible to obtain a step-up regulator in which the output voltage of the output terminal 7 has the opposite polarity to the power supply 1.

Embodiment 5 FIG. FIG. 5 is a circuit diagram illustrating a configuration of a step-up regulator according to a fifth embodiment of the present invention. In the figure, the same or corresponding parts as those shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. In the figure, reference numeral 29 denotes a coupling capacitor, which is connected to the addition circuit 23 via a coupling resistor 30.

Next, the operation will be described. A series circuit including a coupling capacitor 29 and a coupling resistor 30 connected to the positive terminal of the output terminal 7 detects a ripple voltage component V _R (AC component) included in the output voltage Vo and outputs it to the addition circuit 23. The adding circuit 23 calculates the ripple component V _R
It adds the voltage v _in output from the input voltage detection unit 8 and is input to the negative input terminal of the comparator 20.

Since the step-up regulator of the fifth embodiment is configured as described above, the output pulse width of the comparator 20 is adjusted according to the ripple voltage included in the output voltage Vo, and the stable output voltage Vo Can be obtained.

Embodiment 6 FIG. FIG. 6 is a circuit diagram illustrating a configuration of a boost regulator according to a sixth embodiment of the present invention. In the figure, the same or corresponding parts as those shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. The sixth embodiment is different from the first embodiment in that a series circuit of an input coupling capacitor 8c and an input coupling resistor 8d is connected in parallel to a voltage dividing resistor 8a.

Next, the operation will be described. FIG. 12 is an equivalent circuit diagram for explaining the input voltage detection unit 8.
In the figure, (a) is an equivalent circuit of the input voltage detector 8 for the DC component of the input voltage Vi. That is, the input coupling capacitor 8c shown in FIG. 6 is open (resistance value 開放) for the DC component. On the other hand, an equivalent circuit of the input voltage detector 8 for the high frequency component of the input voltage Vi is as shown in FIG. That is, the input coupling capacitor 8c shown in FIG. 6 is short-circuited (zero resistance value) for high-frequency components.
Therefore, the detection voltage v _in the input voltage detection unit 8 is lower for the DC component, higher for the AC component.

As described above, since the feedforward amount for the DC component included in the input voltage Vi and the feedforward amount for the AC component included in the input voltage Vi can be adjusted differently, the input voltage appearing in the output voltage Vo can be adjusted. It becomes easier to suppress the influence of fluctuation.

In the first to sixth embodiments, an example in which a MOSFET is used as the switch 18 has been described. However, it is needless to say that a similar effect can be obtained by using a transistor or a GTO.

[0058]

The switching regulator according to the present invention
Data, the magnitude of the input voltage and the time width of the inverse correlation
A switch having an N signal and an OFF signal having a positive correlation time width.
Signal, and the magnitude of the output voltage is smaller than the reference value.
If the switch signal is not
If the value is larger than the reference value, turn off the OFF signal
, A high-speed feedforward and feedback control can be realized, and a switching regulator with a stable output voltage can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating a boost regulator according to a first embodiment of the present invention;

FIG. 2 is a configuration diagram illustrating a boost regulator according to a second embodiment of the present invention;

FIG. 3 is a configuration diagram illustrating a boost regulator according to a third embodiment of the present invention;

FIG. 4 is a configuration diagram illustrating a boost regulator according to a fourth embodiment of the present invention;

FIG. 5 is a configuration diagram illustrating a boost regulator according to a fifth embodiment of the present invention;

FIG. 6 is a configuration diagram illustrating a boost regulator according to a sixth embodiment of the present invention;

FIG. 7 is an explanatory diagram illustrating a general comparator.

FIG. 8 is a waveform chart illustrating an operation of the comparator 20 shown in FIG.

9 is a waveform diagram illustrating a voltage V ₆ input to the switch driving unit 3 illustrated in FIG.

FIG. 10 is a waveform diagram illustrating an operation of the boost regulator according to the second embodiment of the present invention;

11 is a waveform chart illustrating an operation of a comparator 13 in the boost regulator shown in FIG.

12 is an equivalent circuit diagram illustrating an operation of the input voltage detection unit 8 in the boost regulator shown in FIG.

FIG. 13 is a configuration diagram illustrating a conventional non-boosting type switching regulator;

FIG. 14 is a waveform diagram illustrating the input voltage Vi shown in FIG.

15 is a configuration diagram illustrating the triangular wave generation circuit 11 shown in FIG.

16 is an explanatory diagram illustrating an operation of the comparator 13 illustrated in FIG.

FIG. 17 is a configuration diagram illustrating a basic configuration of a conventional step-up switching regulator.

[Explanation of symbols]

Vi input voltage, Vo output voltage, 1 power supply, 2
Switch, 3 switch driver, 4 choke coil, 5 capacitor, 6 diode, 7 output terminal, 8 input voltage detector, 8a voltage dividing resistor, 8b
8c input coupling capacitor, 8d input coupling resistance, 9 output voltage detector, 10 controller, 11
Triangular wave generation circuit, 12 error amplifier, 13 comparator, 14 integrator, 15 reset circuit, 16 load, 17 choke coil, 18 switch, 19
Triangular wave generator, 20 comparators, 21 comparators, 2
2 output overvoltage time detection circuit, 23 addition circuit, 24
Comparator, 25 feedback resistor, 26 resistor, 27 capacitor, 28 diode, 29 coupling capacitor, 30 coupling resistor.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02M 3/155 H02J 1/00 H02J 1/02

Claims (8)

(57) [Claims] 1. The method according to claim 1, wherein the energy of the input voltage is stored.
Energy-emitting inductor and this emitted energy
Energy and accumulate the output voltage above the input voltage.
The capacitor to be maintained, and the
Energy from the inductor when energy storage is turned off
Switch for controlling the discharge of the
Input voltage detector, and the magnitude and
An ON signal with a time width of Seki and an OFF signal with a time width of positive correlation
Switch signal generating section for generating a switch signal having
An output voltage detecting section for detecting the output voltage;
Comparison comparing the magnitude of the output voltage and the output voltage reference value
And the magnitude of the detected output voltage based on this comparison.
When the output voltage is smaller than the reference value, the switch signal
The detected output voltage is larger than the output voltage reference value.
In this case, use the OFF signal as a drive signal for the switch.
And a driving unit for outputting.
G regulator. 2. The switch signal generating section according to claim 1, wherein
First comparator to which the divided voltage of the voltage and the triangular wave are inputted
A motor, the comparison unit, the divided voltage and the reference voltage of the output voltage
Is input to the second comparator, and the drive unit outputs the output of the first and second comparators.
Side connection, the voltage generated at the connection
And driving the switch.
2. The switching regulator according to 1. 3. A divided voltage of the output voltage exceeds a reference voltage.
Output time to integrate the measured time and output the integration result as a voltage.
Voltage time detection circuit, divided voltage of the input voltage and output overvoltage time detection circuit
And a voltage adder circuit for adding the output voltage, the switching signal generating section, adds binding of the voltage adding circuit
A first comparator for fruit and the triangular wave is inputted, the comparison section, divided output of the output voltage and the reference
A second comparator to which a voltage is input , wherein the driving section outputs the output of the first and second comparators;
Side connection, the voltage generated at the connection
And driving the switch.
2. The switching regulator according to 1. 4. The divided voltage of the input voltage is a resistor and a resistor.
The above input is made using a voltage dividing circuit consisting of
The voltage is divided, and the voltage drop in the diode is determined by the switch signal.
Is set so that the pulse width of
3. The switching leg according to claim 2, wherein
Curator. 5. One end is connected to an output section of the output voltage.
Other than a coupling circuit consisting of a resistor and a capacitor connected in series
Output voltage at the terminal and the divided voltage of the input voltage.
Comprising a voltage adding circuit for calculation, the switch signal generating section, adds binding of the voltage adding circuit
And a first comparator to which the output voltage and the triangular wave are input.
Voltage and a reference voltage are input to the second comparator.
And the driving unit outputs the output of the first and second comparators.
Side connection, the voltage generated at the connection
And driving the switch.
2. The switching regulator according to 1. 6. The input voltage is divided by the input voltage.
To the series circuit of the first resistance element and the coupling capacitor.
A third resistor is connected to a circuit formed by connecting the second resistor in parallel.
That the voltage is divided by the circuit connected in series.
The switching regulator according to claim 2, characterized in that:
Ta. 7. An energy storage device for storing energy of an input voltage,
Energy-emitting inductor and this emitted energy
Energy and accumulate the output voltage above the input voltage.
The capacitor to be generated and the
Energy from the inductor when energy storage is turned off
Switch for controlling the discharge of the
An input voltage detecting section based on the magnitude of the detected input voltage.
Output a switch signal for driving the switch.
Comparator and output voltage detection for detecting the output voltage
Section, the magnitude of the detected output voltage and the output voltage reference value.
Compare and change the output voltage according to the comparison result
The first comparator
Connected to the output of the second comparator.
And a switching regulator. 8. The system according to claim 1, wherein the first comparator is configured to output the input voltage.
First comparator to which the divided voltage and the triangular wave are input
The switching according to claim 7, wherein
regulator.