JPS5872345A - Charing and discharging power source - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Field of the Invention The present invention relates to a charging/discharging power supply device that improves the stability of discharging by efficiently and accurately charging even when the number of stages in a charging/discharging section changes.

(2) Prior art■ Generally, as a device for easily obtaining pulses, this type of device consists of a power supply section and a charging/discharging capacitor, and obtains pulses by charging and discharging the charging/discharging capacitor. The device 1U is widely used as a device for optical excitation when obtaining laser light. By the way, lasers have recently been widely used in processing fields such as welding, cutting, and grooving.

Therefore, a laser beam with irradiation energy and irradiation time suitable for each processing application is indispensable, and as a means to achieve this, conventionally, the charging/discharging capacitor's charging/discharging capacitor's charging tt pressure and the number of stages used have been changed, and laser light according to each application has been used. It has gained. In other words, in order to obtain a laser beam with a long irradiation time, the number of stages of charge/discharge capacitors used is increased and the discharge time is lengthened, and the photoexcitation time is lengthened.To shorten the irradiation time, the number of stages of charge/discharge capacitors used is reduced. , the optical excitation time can be shortened. In this case, when the charging/discharging capacitor is discharging, charging from the power supply unit to the charging/discharging capacitor is stopped.

■Also, when charging, if a commercial frequency of 50/60Hz is used as a charging power source, there are those that use an AC phase control circuit to feed back the charging % flow and charging voltage, and those that use a commercial power source. There is a method that converts it into direct current and performs direct current charging using a high frequency DC-DC converter.

(3) Problems with the conventional technology In the conventional technology described in (■) above, when the number of stages of charging/discharging capacitors used is significantly changed, the charging time of the power supply section changes significantly, and the charging time required to respond to the kneading process is Control 1 was very difficult. Therefore, the accuracy of charging is poor, and the stability of discharging is also poor, resulting in a fundamental drawback that the desired laser light cannot be obtained.

In addition, although the above-mentioned fundamental drawback is taken into consideration in the above-mentioned item (2), due to the instability of the control circuit due to the feedback time delay, excessive current and overcharging occur when the discharge capacitor has a large capacity or a small capacity. It is difficult to improve charging accuracy without impairing Fi. Furthermore, when using a DC-DC converter, the circuit i8 is complicated, which is not preferable in terms of manufacturing.

(4) Purpose of the Invention The present invention provides an ItIL source device for charging/discharging that is easy to manufacture and can perform charging uniformly and with high precision even when the capacity i of the charging/discharging section changes, thereby obtaining a stable discharge condition. It is about providing.

(5) Key Points of the Invention The present invention, when charging a charging/discharging section, performs charging in a predetermined charging cycle, sequentially detects the charging voltage in each charging cycle, and compares it with a reference voltage using comparison amplification MK. The phase of communication to the charging/discharging section in each charging cycle is controlled in accordance with the comparison signal, and charging is performed to a constant charging voltage of /'/T. Furthermore, when the capacity of the charging/discharging section is changed, the above object is achieved by setting the initial energization phase of the energization phase to a value corresponding to the capacity.

(6) Additional Embodiments of the Invention - Next, an embodiment of the present invention is shown in Figures 1, 2, and 3.
Explain & explain using diagrams. Note that FIG. 1 shows a configuration diagram, and FIGS. 2 and 3 show characteristic diagrams.

Terminals U and Terminal ■ and Terminal U and Terminal wFi are AC power terminals, and between terminals U and W' there is a lash and current prevention coil 1, and a control rectifier connected in 'parallel' with the polarity reversed. 2
, 3 (such as 1 iris) and the primary side of the power transformer 4 are connected in series.

Further, the '-primary side of the phase shift transformer 5 is connected between the terminals U' and V. The charging cycle is determined based on the AC frequency between the terminals UV. A rectifier circuit 6 is connected to the secondary side of the tL rest body run, and a photodischarge capacitor 7.8 and a resistor 9 are connected to both ends of the rectifier circuit 6.
and 10 series circuits and discharge tubes 11 that discharge and emit light are connected in parallel with each other. What about the charge/discharge capacitor mentioned above? 7 is connected to a rectifier circuit 6 via a switch S1. Further, near the discharge tube 11, a laser material 12 that is optically excited by receiving the nostril light from the open tube 11 is installed, and a device that reflects the light of the laser material 12 is placed on the optical axis of the laser material 12. A pair of resonant mirrors 13, one half-mirror and the other mirror, are installed so as to face each other with the laser material 12 degrees in between. Maf
C14 is a comparison amplifier circuit that compares the charging voltage with a predetermined reference voltage.The negative input terminal of this comparison amplifier circuit 14 is connected to the common connection of the resistors 9 and 10, and the upper end is connected to the DC voltage. Power supply 15. A sliding portion of a reference voltage adjusting resistor 17 applied via a resistor 16 is connected thereto. Furthermore, a switch SL for short-circuiting the voltage applied to the adjustment resistor 17 is connected to both ends of the reference voltage adjustment resistor 17. The output side of the comparison amplifier circuit 14 is connected to the pace side of a transistor 18 which controls 11 currents according to the signal from the comparison amplifier circuit 14.

On the other hand, a phase-shifting capacitor 19 is connected to one end of the secondary side of the phase-shifting transformer 5 mj, and the output side and the phase-shifting transformer 5 are connected to each other.
A diode 20, 21.2 is connected between the other ends of the secondary side of the
The input end of the pre-two/rectifier circuit formed by 2.23 is connected.

Furthermore, one end of the output side of this bridge II current circuit has a resistor 2
4 is connected to the collector side of the transistor 18, and tin is connected to the emitter side of the transistor 18. Note that a resistor 25 is connected in parallel to the resistor 24 via a switch Sl, and the switch SS and the switch S1 are not interlocked. Further, a dirt pulse generation circuit 26 that outputs a dirt pulse by a voltage difference between the middle point of the secondary side of the phase shifting transformer 5 and the output side of the phase shifting capacitor 19 is connected to the middle point of the secondary side of the phase shifting trough 150 and It is connected to the output side of the phase shifting capacitor 19. The control rectifying elements 2 and 3 operate according to the output of the gate pulse generating circuit 26.

In addition, in the clock oscillation circuit for starting discharge of the zvFi* Lassi lamp 11, this clock oscillation circuit 27 is connected to Fi.
An opening/closing circuit 28 is connected to open and close the creation switch S-, and a trigger circuit 30 is connected to this opening/closing circuit 28 to provide a starting trigger to the Fludge Elan fil through a trigger electrode 29 tube wound around the Fludge Elamp 11. has been done.

Next, the apparatus constructed as above will be explained. First, when generating a knee pulse waveform with a wide pulse width, the switches S1 and 5sri are closed. When charging is performed in this state, the clock signal is not output from the clock oscillation circuit 27, and the switch SsU is shifted.
It is in the open state. When an alternating current is applied between the terminals UV and UW, the reference voltage of 1 set by the direct current power supply 15 is input to the positive side end of the comparison amplifier circuit 14. Once this happens, a positive signal is output from the comparison amplifier circuit 14, turning the transistor 18 completely on. That is, the secondary side circuit of the phase shift transformer ≠ t5 is formed as a closed circuit via the transistor 18, and is mainly based on the time constant of the capacitance of the phase shift capacitor 19 and the parallel resistance of the resistors 24 and 25. Signal phase shift transformer 5
occurs between the middle point of the secondary side of the phase shift capacitor 19 and the output side of the phase shift capacitor 19. The signal between these two points is input to the )f-)/4' pulse generating circuit 26. The goutton pulse generating circuit 26 controls the cutting control rectifying element 2.degree. 3 at the conduction angle .theta.l shown in FIG. In one cycle above,
On the primary or secondary side of the power transformer 4, a voltage waveform as shown in 1 in FIG. 2 or a current shaping as shown in b in FIG. 2 can be obtained. Note that the sine wave UW is a power waveform between terminals UW. The voltage or current Fi obtained in this way is full-wave rectified by the rectifier circuit 6 on the secondary side of the cutting phase shift transformer, and is charged by 0 or more to be charged to the charge/discharge capacitor 7.8. The specific voltage is fed back to the negative end of the comparison amplifier circuit 14 from the connection point between the resistors 9 and 10, and is compared with the reference voltage at the positive end in the same manner as described above. At this time, the difference between the negative end pressure and the positive end pressure is smaller than in the charging cycle. Therefore, the output of the comparison amplifier circuit 14 decreases, and the transistor 18 decreases its collector current. Therefore, the time constant on the secondary side of the phase shift transformer 5 is mainly due to the parallel component of the phase shift capacitor 9, the resistors 24 and 25, and the resistance generated by the decrease in the collector current of the transistor 18, which makes the elements 2 and 3 conductive. The angle decreases. That is, the amount of charge to the charging/discharging capacitors r and tt decreases.

Charging to a predetermined voltage is performed by reversing the above-described actions. Note that this repetition period is the same as that of the terminal U.
The charging voltage and charging current of this repeated process over 6, which is caused by the AC power frequency between -4 and 4, are shown by the solid line ■l and the solid line in Figure 3! As shown in 1-4 to ■1-4, ■
. represents a predetermined voltage, and ts=tsti represents the time t! ~tl
;tl~tl,...+t@"-t@, each -j is equal time and corresponds to the conduction 01 cycle time of the control rectifying elements 2 and 3. The vertical axis (■) represents the charging current, and the pH discharge current The reason why the peak values of the current !, -1 to ■, and -4 in each charging cycle are different is that as charging progresses, the current of the transistor 18 decreases, and the amount of charge in the charging/discharging capacitor 7.8 changes in each cycle. This is because the conduction angle θ gradually increases and becomes smaller.

When the charging and discharging capacitor 7.8 reaches the predetermined charging voltage vc as described above, a voltage corresponding to the reference voltage set by the DC power supply 15 is applied from the connection point of the resistor 9.10 to the comparison It is input to the negative end of the amplifier circuit 14. Then, the output Fio of the comparison amplifier circuit 14 or the negative transistor 18 is turned off.

Therefore, the secondary circuit of the phase shift transformer 5 cannot be opened.
(above) f-) No. 4 pulse generation circuit 26fd control adjustment tl
At the timing of the forward bias of the LllE element z, s, the F1'-) pulse is not outputted, the rectification control elements 2 and 3 are not fired, and charging to the charge/discharge capacitor 7°I is stopped. When irradiating laser light, the clock oscillation circuit 21 outputs a clock, the switching circuit 28 closes the switch 81, the trigger circuit J0 issues a starting trigger, and the charging/discharging capacitor 1.8 The amount of charge is discharged to the seven lash lamps 11. The symbol *Ps in FIG. 3 indicates the discharge current waveform and indicates the TsFi time.

The discharge of the flash lamp 11 generates pulsed light with a wide pulse width, and the laser substance 12 is excited by this pulsed light to emit an eraser with a long irradiation time.

Next, when generating a narrow pulse waveform with a width of 14 pulses, the switches S1 and SS are opened. Therefore, the charging/discharging capacitor 7 and the resistor 25 are disconnected from the circuit system. In this state, the same effect as in case 1 is performed when the wide pulse waveform described above is generated. As a result, a positive signal is output to the output of the comparison amplifier circuit 14.

This signal is a signal that completely turns on the transistor 18. Therefore, the secondary side circuit of the phase shift transformer 5 is closed, mainly consisting of the capacitance of the phase shift capacitor 19 and the resistance 2.
A signal based on a time constant of 4 is generated between the middle point of the secondary side of the phase shift transformer 5 and the output side of the phase shift capacitor 19. Then, the signal between these two points is f-) pulse generation circuit 2
6 is input. Therefore, this f-tono 4 rus occurrence number 11
126 is 0! shown in FIG. The rectifying element 2 is controlled at a conduction angle of
Control 3. Here, θ1>01 because the time constant of the secondary side circuit of the phase shift transformer 5 can be changed by the independent value of the resistor 24 with respect to the value of the parallel connection of the resistors 24 and 25. If 24 is used alone, the time constant will be longer, and Dart/'? The rising edge of the input signal to the pulse generating circuit 26 is f! ! This is because e-) the transmission of the dart pulse signal from the pulse generating circuit 26 that brings the control rectifying elements Z and S into conduction is delayed. However, in this one cycle of action, the power transformer 4
A voltage waveform like C in the wJ2 diagram or a current waveform like [dO] can be obtained on the primary or secondary side of the circuit. These voltages or currents are full-wave rectified by the rectifier circuit 6 and charged to the charge/discharge capacitor 8. Then, in the next charging cycle, this charging voltage is fed back from the connection point of the resistor 9.10 to the negative side terminal of the comparison amplifier circuit 14o.
It is compared with the reference voltage at the positive side end, and a positive output corresponding to the difference is inputted to the transistor 18. This causes the current flowing through transistor 18 to decrease compared to the previous charging cycle. The resistance of the shoe transistor 18 increases. Therefore, the time constant of the secondary circuit of the phase shift transformer 5 becomes longer, and as a result, the conduction angle of the controlled rectifying elements 2 and 3 is reduced.

By repeating the above charging cycle, the charging/discharging capacitor 7 is charged. Then, when the charging of the charging/discharging capacitor 8 reaches a predetermined charging voltage vc, charging is stopped in the same way as when obtaining the wide pulse described above. Then, a laser beam with a short pulse width is generated by the same effect as the laser beam irradiation described above. The waveform of the current discharged to the flood lamp 11 at this time is shown by the dotted line P in FIG.

As described above, by sequentially feeding back the charging voltage in each cycle, changing the charging phase in each cycle, and controlling the charging current, it is possible to maintain accuracy within a specified time even if the capacitance of the charging/discharging capacitor changes. Charging takes place. In addition,
In the above embodiment, the charging cycle is determined based on the AC power frequency, but a charging cycle may be set separately depending on the situation.

Further, the present invention is not limited to the above-described embodiments, and the power source may be a single-phase, three-phase, or polyphase power source as long as it does not deviate from the gist of the invention. Of course, the present invention can also be applied to devices that require pulse output.

According to the present invention, in a Noculus field power generation device composed of a power source section and a charging/discharging section, the charging cycle is made uniform in response to changes in charging/discharging capacity that are performed to obtain a desired output. Any capacity can be handled by controlling the amount. In other words, there is no need to consider overcharging to a predetermined voltage or higher in a short period of time when the capacity is small, or long-term charging and excessive current in the charging circuit when the capacity is large. Charging voltage accuracy can be maintained regardless of capacitance changes using a normal commercial power source without using a special power source. Therefore, it is possible to obtain an optimal pulse output in a device that requires a /4 las output, and a good quality lasing output can be easily obtained. %, in processing (for example, welding) using laser light, it is possible to provide the optimum laser light, and it is easily possible to improve the processing accuracy. In other words, it is possible to provide a charging/discharging power supply device that can easily realize a device that fully satisfies the accuracy required for various pulses.

[Brief explanation of the drawing]

FIG. 1 is a Th diagram of an embodiment of the present invention, FIG. 2 is a diagram showing the charging current waveform, charging voltage waveform, and conduction angle of the control rectifier in one cycle in FIG. 1, and FIG. 1
It is a figure which shows the waveform of the charge process of charge-current to the predetermined voltage, charge %Lt pressure, and the current waveform of discharge in a figure, respectively. 2.3... Control rectifying element, 5... Phase shift transformer, 7
．． 8... Charge/discharge capacitor, 19... Phase shift capacitor, 26... Good pulse generation circuit. Single agent Patent attorney Takehiko Suzue Figure 1

Claims (1)

[Claims] a means for determining a Marugame cycle; a control rectifier that energizes and outputs an AC power signal in a controlled energization phase within one charging cycle determined by the means;
A plurality of charging/discharging sections each having a means for varying the number of stages used perform charging based on the energization output of the control rectifying section, and the charging voltages of these charging/discharging sections are sequentially compared with a predetermined reference voltage in each charging cycle. a comparison section that outputs a signal according to the difference; a phase control section that controls the energization phase of the control rectification section according to the signal of the comparison section; means for determining an initial phase control output of the charging/discharging section, and charging of the charge/discharge section is started at the initial energization phase determined by the means, and charging is performed according to the phase control output of each charging cycle of the phase control section. A charging/discharging power supply device characterized by stopping charging and discharging to a discharge body when a predetermined charging voltage is reached.