JPH0484672A - Pulse power unit for energizing - Google Patents

Abstract

PURPOSE:To control a pulse width and repetitive oscillation frequency in the wide range and moreover, to accurately make a response at high speed by supplying a control pulse to a switching element connected with a DC power source and controlling its duty factor and repetitive frequency. CONSTITUTION:Pulses generated by turning on and off the high-speed switching element 2 connected in series with the power source 3 are supplied to an electrode 4 and an object 5 to be worked via a transformer 1 and in the pulse power unit to utilize to work the object 5 to be worked, in a circuit to supply the control pulse via a driver 18 to the high-speed switching element 2, a pulse width modulation circuit is utilized to change and control the oscillation frequency by the output of a working clearance 6 state or state detection circuit 16 of an energizing circuit, by which the pulse width can be controlled in the extremely wide range of ms-mus-ns. The response can be then made at high speed to variation of a working state by controlling the repetitive frequency of the generated pulses by a detection signal of the working clearance 6 state.

Description

[Detailed description of the invention] [Field of industrial application] The present invention is applicable to arc welding, spot welding, micro welding, micro stud machining, electrolytic machining, electrolytic grinding, electroplating, ram-type electrical discharge machining, wire cut electrical discharge machining, low temperature electrical discharge machining, The present invention relates to a pulse power supply device for electrical processing, which is widely used in devices that perform desired processing by applying pulsed current to a workpiece, such as discharge sintering and laser processing.

[Prior Art] Conventionally, as these pulse power supply devices for current processing, devices to which pulse width modulation technology is applied are known.

According to such pulse width modulation technology, the pulse width can be changed without changing the frequency of the processing pulse, and the duty factor can be controlled over a wide range from 1% to 99%.
By outputting the oscillation pulses through a pulse transformer, it is possible to generate pulses that match the processing purpose and processing conditions, so this type of power supply device is widely used.

[Problems to be solved by invention]

A conventional power supply using a pulse width modulation control method is of a type in which the repetition frequency of the output pulse is kept constant and the duty factor, that is, the on/off time of the pulse is changed and controlled.

However, it has been found that with this type of power source, it is not possible to respond sufficiently quickly to changes in machining conditions in a recently developed high-speed current-carrying machining device that utilizes high frequencies.

Although this known power source can be used for electrolytic machining, etc., where machining is performed using relatively low-frequency pulses, it is difficult to use it when high-speed response is required, such as in the latest electrical discharge machining equipment. be.

However, especially in the case of electrical discharge machining, it is necessary to adjust and control not only the pulse width but also the pulse pause width and repetition frequency, and it is necessary to precisely control it in response to changes in the machining state. If you do not respond quickly, abnormal discharges such as arc discharges and discharges in gas will occur, which will not only deteriorate the machined surface, but if these abnormal discharges continue, it will be difficult to supply machining fluid to the machined part, especially when There was a problem in deep hole machining, etc., that the machining stopped progressing at all.

The present invention was made in order to solve the problem of slanting.The purpose of the present invention is to improve the power supply that applies pulse width modulation technology so that it can quickly respond to changes in processing conditions. We aim to provide an inexpensive power supply device that is highly reliable and can be widely used as a pulse power source for various types of processing, as it can control not only the width but also the repetitive oscillation frequency over a wide range, and can respond quickly and accurately. be.

[Means to solve the problem]

The object of the present invention diagonally above is to provide a pulse power supply device for current-carrying machining, which comprises a switching element connected in series to a DC power source and an output terminal of the switching element connected to the primary winding of a coupling transformer. a pulse oscillation circuit that supplies control pulses to the switching element, a circuit that detects the machining state, and a circuit that controls the duty factor of the control pulse and its repetition frequency using the detection signal of the machining state detection circuit. This is achieved by providing

The purpose of the diagonal is also to provide a high-frequency pulse oscillation circuit that supplies control pulses to switching elements that control the opening and closing of a DC power source, and a high-frequency pulse oscillation circuit that oscillates low-frequency pulses and uses its output to control the pulse oscillation circuit. A control system consisting of a low frequency pulse oscillation circuit that controls the output, a circuit that detects the machining state, and a circuit that controls the duty factor and repetition frequency of the low frequency pulse based on the detection signal of the machining state detection circuit. This can also be achieved by a pulse power supply device for electrical machining equipped with a device.

The purpose of the above is to connect the pulse oscillation circuit to a sawtooth wave generation circuit, a comparator that compares the output of the energization state detection circuit and the sawtooth wave generation circuit and generates a signal to determine the magnitude of the output, and a sawtooth wave generation circuit. This can be achieved more reliably by configuring a circuit that controls the oscillation frequency.

Further, it is desirable that a coupling transformer used in a pulse power supply device for diagonal current processing be provided with a plurality of pulse input windings on the negative side and a plurality of output connection taps on the secondary side winding.

[For production]

The pulse power supply according to the present invention applies the pulse width modulation control technology as described above, but unlike conventionally known ones, in addition to controlling the pulse width, the pulse repetition frequency is also controlled by the energization state detection signal. Since oil can be produced, the state of current-carrying machining, that is, the discharge state in the machining gap, the current flowing,
The pulse repetition frequency can be adaptively controlled in response to changes in voltage, machining progress state, machining area, machining direction, etc. Furthermore, in one aspect of the present invention, high frequency and low frequency Two types of pulse oscillators are used together, and the power supply is controlled to open and close based on the logical product of their outputs.As a result, when the machining condition deteriorates, the supply of machining pulses is immediately interrupted, and the deteriorated machining condition can be controlled at high speed. It can be recovered by
This makes it possible to stabilize the machining state over a long period of time.

In addition, the pulse transformer that converts pulse voltage is equipped with multiple input windings and output taps, and can be made compatible with any power source by switching the connection of the input windings, and can be made compatible with any power source by switching the output taps. Various types of pulsed power from high voltage and low current to low voltage and large current can be obtained using a small high frequency transformer.

〔Example〕

The present invention will be explained below with reference to the drawings.

FIG. 1 is a circuit diagram showing the configuration of an electric discharge machining apparatus equipped with a power supply device according to the present invention, and FIGS. The figures are circuit diagrams showing other different embodiments, and FIG. 9 is a time chart explaining the operation thereof.

In FIG. 1, 1 is a pulse I lance, 2 is a high-speed switching element, such as an MO3 type FET, which is inserted in series with one of the primary windings of the pulse lance 1.
3 is a DC power supply, 4 is a processing electrode, 5 is a workpiece, 6 is a processing gap formed between the processing electrode 4 and the workpiece 5, 7
1 is a rectifier circuit, 8 is an orthogonal changeover switch, 9 and 10 are resistors for detecting the voltage and current between the electrode 4 and the workpiece 5, 11 is a synchronous pulse shaping circuit, 12 is a sawtooth wave generation circuit, 13.14 15 is a photocoupler, 15 is an arithmetic control circuit, 16 is a current detection circuit, 17 is a comparator, and 18 is a driver for driving the switching element 2.

The switching element 2 is driven at high speed by the output pulse of the driver 18, and supplies the pulse to one of the primary windings 1a of the pulse transformer l. The pulse is converted by a pulse transformer 1 and one of the terminals 1 provided on its secondary winding.
b is supplied to the electrode 4 and the workpiece 5 via the orthogonal changeover switch 8, and generates an electric discharge within the machining gap 6.

The voltage and current between the electrode 4 and the workpiece 5 are detected by a resistor 9 and an IO, respectively, and their detection signals are supplied to an arithmetic control circuit 15 and a current detection circuit 16 via photocouplers 13 and 14, respectively.

The pulse transformer 1 has a tertiary winding 1c and a quaternary winding 1d outside of the negative and secondary windings, and a synchronizing signal B as shown in FIG. 2B is obtained from the quaternary winding ld.

This synchronizing signal B is supplied to a sawtooth wave generating circuit 12 via a pulse shaping circuit 11, and the sawtooth wave generating circuit 12 generates a sawtooth wave signal that is synchronized with this synchronizing signal B, as shown in FIG.

On the other hand, the current detection circuit 16 generates a DC voltage signal C that changes inversely so that the input, that is, the average terminal voltage of the current detection resistor lO, decreases when it increases, and increases when it decreases. , the analog signal C is supplied to the comparator 17 together with the output of the sawtooth wave oscillation circuit 12.

As shown in the second diagram, the comparator 17 compares the DC voltage signal C generated by the current detection circuit 16 with this sawtooth signal, and generates a pulse signal whose output becomes high when the former is higher than the latter. Occur.

In response to this pulse signal, the driver 18 supplies the above synchronizing pulse to the tertiary winding 3c of the pulse transformer 1, and drives the switching element 2 as described above to change the primary winding of the pulse transformer 1. It supplies pulses to 1a.

Now, it is assumed that the oscillation period of the sawtooth wave oscillation circuit I2 is T, the pulse width of the output pulse D of the comparator 17 is τoo1, and the pause width is τoff.

Therefore, if the current flowing through the machining gap 6 decreases for some reason, the average voltage signal between the terminals of the resistor IO, that is, the current detection signal, decreases, and the current detection circuit 1
6, the DC voltage signal C input to the comparator 17 rises as shown in FIG. 2 C3.

Therefore, at this time, the output pulse D of the comparator I7
, the τon becomes longer, and the length τo becomes longer.
ff is controlled to become shorter. However, the period T, that is, (off at ron+) is kept constant.

This control pulse turns on and off the switching element 2,
Since the pulses generated thereby are transformed into voltage by the pulse I/lance 1 and supplied to the machining gap 6, the average value of the supplied current increases as follows, so that a decrease in the machining current is prevented.

However, 1p is the peak current.

Conversely, if the machining current increases too much, the DC voltage signal C or C2 input from the current detection circuit 1G to the comparator 17 decreases, so in this case, the output pulse D of the comparator 17 τon will be shortened, τoff will be lengthened, and the average value of the supplied current will decrease.

By using the machining current as a comparison signal in this way, the pulse width of the control pulse supplied to the switching element 2 is automatically controlled, so that the supply current supplied to the machining gap is always controlled to be constant. become.

FIG. 3 is a graph showing a state in which the DC voltage signal C continuously decreases. At this time, the period T of the output pulse of the comparator 17 is kept constant, but τon gradually decreases,
Off increases by the amount of the decrease.

On the other hand, the state of the machining gap is also detected by the resistor 9, and the signal is sent to the arithmetic control circuit 15 through the photocoupler 13.
supplied to

Although it is not essential here, by using the photocoupler 13, it is possible to insulate between input and output, noise from the machining gap, etc. will not affect the arithmetic control circuit 15, and signal transmission will be reduced. Since it is unidirectional, the signal does not spread from the output signal to the input side, and stable signal transmission becomes possible.

The arithmetic control circuit 15 is, for example, a CPU for fuzzy control, and although not shown, it consists of a memory for storing control functions, arithmetic programs, etc., an I10 interface, and other circuits, and performs logical operations based on signals input through the r10 interface. and output the control operation amount through the ■/○ interface.

This control operation signal is applied to the sawtooth wave generation circuit 12, thereby controlling its oscillation period T.

For example, if we explain the case of electrical discharge machining,
When the machining gap 6 is enlarged, the terminal voltage of the resistor 9 increases in proportion to the machining gap.

The arithmetic control circuit 15 receives this increasing signal, performs a logical operation, and increases the oscillation frequency of the sawtooth wave generation circuit 12 by 1 to a predetermined value based on the result.

Therefore, the frequency of the output pulse of the comparator 17 is increased, the repetition frequency of the machining voltage pulse is increased, pulse discharge is performed at high frequency, and control is performed to improve the machining speed.

On the other hand, when the machining gap 6 is caught and stable discharge cannot be maintained, the terminal voltage signal of the resistor 9 decreases, and in this case the arithmetic control circuit 15 adjusts the oscillation frequency of the sawtooth wave generation circuit 12. This lowers the repetition frequency of the machining pulses supplied to the machining gap 6, thereby promoting removal of machining layers etc. deposited in the machining gap and stabilizing the machining.

Therefore, in addition to controlling the pulse width of the machining pulse, the repetition frequency is optimally controlled depending on the state of the machining gap, making it possible to perform electrical discharge machining at higher speeds and with higher precision in more stable conditions. Become.

That is, in the present invention, by utilizing the fact that the machining gap state detection signal is caused by the size of the machining gap or the width of the machining gap, the machining pulse is set when the machining gap is normal around a predetermined value or more. By controlling not only the pulse width but also its period T, the average discharge energy of the supplied machining pulses can be supplied at the maximum allowable limit, and the repetition frequency of the machining pulses can also be increased to the maximum allowable value. Therefore, electrical discharge machining is performed in the best planned machining state.On the other hand, when the machining gap 6 is narrowed below the allowable lower limit value, the machining pulse width is minimized and It also reduces the repetition frequency of machining pulses, increases the discharge body stop time width, promotes the removal of machining layers, etc., lengthens the waiting time for insulation recovery in the machining gap, and thereby prevents the occurrence of arc discharge. Control to accelerate return to normal state.

By controlling the emitted Xu energy in this way, it is possible to prevent the machined surface from becoming rough or damaged, making it possible to return to the normal gap state, and thereby improving machining performance and machining efficiency. can.

Also, when performing wire-cut electric discharge machining, depending on the desired machining shape, as the machining progresses,
Machining of corners and changes in plate thickness occur, but these state changes are detected by voltage signals in the machining gap, etc., and the detection signals are input to the arithmetic control circuit 15 to perform logical calculations. By outputting a predetermined device signal and controlling the machining pulse parameters, all required steps can be performed in a stable state, and the planned accuracy and machining speed can be reliably achieved.

For example, when machining the edge of a workpiece by changing the machining feed direction, when a change in the machining direction is detected by a machining state detection signal or a signal from an NC device (not shown) for controlling contour machining, etc. , based on the calculation result of the calculation control circuit 15, the oscillation frequency of the sawtooth wave generation circuit 12 is controlled to be reduced to a required value, thereby maintaining the machining accuracy of the corner and stabilizing it without causing wire breakage. Wire cutting) can be performed with high efficiency and configured in a way that can be done.

It should be noted that the pulse transformer l shown in Fig. 1 is provided with a plurality of primary windings, and each of these secondary windings is provided with a DC power supply and a switching element, so these may be driven in parallel or It is possible to selectively switch and drive using a switch that is not set.

In this case, for example, by using a ring counter or a sequential circuit in the driver 18 and sequentially switching the transformer input, it is possible to output a pulse train whose peak value changes in rotation.

In addition, by switching and connecting multiple taps provided on the secondary winding side, it is possible to take out any output from low voltage and large current to high voltage and low current, making one pulse transformer versatile. You will be able to use it.

In addition, since pulse width modulation technology is used, the pulse width of the control pulse, that is, the duty factor, can be controlled at high speed over a wide range in immediate response to the state of the machining gap, such as on a diagonal. Since it can be converted into any voltage and current using a transformer, for example, the output pulse width can be controlled in m5-ns, the frequency in the range of 1 to 5 KHz, and the power output can be controlled in a wide range of about 100W to IKW. The device of the present invention can be used for various purposes, such as arc welding (1KHz, ms) as an inverter or pulser for electrical processing.
, electrolytic machining (15KHz, ms), discharge low temperature sintering (
20KHz, ms), spot welding (20KHz, ms)
,? Micro welding (IMHz, Its), microstat machining (IMHz, μs), ram type electrical discharge machining (lO
Kt (z-IMHz, ns), wire cut electric discharge machining (5KHz, ns), laser machining (100M
It can be widely used for applications such as Hz, μs), etc.

In the second embodiment, the machining gap voltage signal is input to the arithmetic control circuit 15 and the current signal is input to the circuit 16, but this may be reversed, or the comparator 17 It is also possible to manually control the comparison signal input to the arithmetic control circuit 15, and to arbitrarily change and control the pulse width τon and duty factor of the comparison output. In addition to the current and voltage in the machining gap, the peak value of the discharge current, the impedance of the machining gap, and the sound and light generated by the discharge can be used as desired.

Next, the embodiment shown in FIG. 4 will be explained.

In FIG. 4, 19 is a pulse oscillator, 20 is a monostable element, 21 is a gate circuit, 22 is an arithmetic control circuit,
23 is a circuit for detecting the voltage in the machining gap.

Monostable element 2 with signal of pulse oscillator 19
0 is driven, and its pulse output is supplied to the gate circuit 21 together with the output of the voltage detection circuit 23.

The output pulse of the monostable element 20 has a frequency set by the pulse oscillator 19 and a pulse width set by the monostable element 20. Therefore, by changing the operating time of the monostable element 20, the pulse width, i.e. , the duty factor can be controlled, and by changing the oscillation frequency of the pulse oscillator 19, the repetition frequency of the output pulse can be controlled.

22 is an arithmetic control circuit consisting of a CPU, which receives the output signal of the voltage detection circuit 23, performs arithmetic processing such as fuzzy inference, outputs a necessary operation signal, and controls the operating time of the monostable element 20. It is something that you should do.

Therefore, even with this device, the machining gap signal
The pulse width τon of the drive output pulse and its utility factor τ0 can be automatically and adaptively controlled.

FIG. 5 is a circuit diagram showing the configuration of still another embodiment.

In this embodiment, the delay time of the monostable elements 1 to 20 as well as the oscillation frequency of the pulse oscillator 19 are controlled by the arithmetic control circuit 22 shown in FIG. Pulse width τon
It can be automatically controlled by the repetition frequency or machining gap signal together with the duty factor.

Of course, as in the first embodiment described in Section 2, the machining voltage and current are detected separately, or the impedance of the machining gap, sound, light, etc. generated due to electric discharge are detected, and these detection signals are used. may be supplied alone or in combination to the arithmetic control circuit 22 for control processing.

It should be noted that the oscillation frequency of the pulse oscillator 19 is controlled by the arithmetic control circuit 22, and the delay time of the monostable element is manually set. The monostable element 20 may be controlled by the arithmetic control circuit 22.

FIG. 6 shows an embodiment in which the sawtooth wave oscillation in the embodiment shown in FIG. 1 is controlled intermittently using a low frequency signal,
The same reference numerals as in FIG. 1 indicate the same components.

The voltage in the machining gap is detected by a resistor 9, the output signal thereof is input to an arithmetic control circuit 25 similar to the arithmetic control circuit 15 described above, and the gate 24 is controlled by the output pulse.
The high frequency sawtooth wave output of the sawtooth wave generation circuit 12 is controlled intermittently by the output pulse of the low frequency calculation control circuit 25.

FIG. 7 is a circuit diagram showing still another embodiment, in which the voltage in the machining gap is detected by a resistor 9, its output signal is inputted to the arithmetic control circuit 25, and its output pulse is used as the output pulse of the comparator 15. The gate circuit 26 is controlled by the output pulse of the arithmetic control circuit 25, and the high frequency output pulse of the comparator 15 is controlled intermittently by the low frequency output pulse of the arithmetic control circuit 25. This is an example.

FIG. 8 is a circuit diagram showing yet another modification example, and the first
The output of the current detection circuit 16 in the figure is transferred to the arithmetic control circuit 2.
5 is supplied to the gate circuit 26 together with the output from the arithmetic processing in step 5, the output pulse of the current detection circuit 16 is controlled to be intermittent, and the intermittent pulse train is supplied to the comparator I5.

According to this configuration, the output of the comparator 15 is as shown in FIG.
It becomes high only when the level is lower than the output E of .

This pulse train is controlled intermittently at a repetition period determined by the basic high-frequency pulse train or the output of the arithmetic control circuit 25, and the pulse width of the basic pulse train is controlled by the output E of the voltage detection circuit 16, Furthermore, since the output E is controlled according to the current flowing through the resistor IO, the pulse width of the basic high-frequency pulse train also varies according to the output E.

Such a pulse train can be used for electric discharge machining and wire electric discharge machining, for example, if the pulse width of the basic high-frequency pulse train is set to about μS~08, and the intermittent control interval is set to about ms.

In this case, the pulse train is intermittent with a period of about ms, so
During the interruption period, machining debris, gas, etc. are sufficiently removed from the machining gap, so by sequentially adaptively controlling this intermittent period according to the machining conditions, machining can be performed in an extremely stable state. .

In addition, in FIG. 6 and FIG. 8, if the comparison voltage signal input to the comparator 15 is configured to be manually set and controlled, the pulse width of the basic pulse and the duty factor can be manually set and controlled. Also, the arithmetic control circuit 25
As inputs to be supplied to the machining gap detection circuit, in addition to voltage and current, physical quantities such as sound and light generated due to discharge can be used.

Further, for this basic intermittent control of the high-frequency pulse train, the pulse oscillator used in the embodiment circuit shown in FIGS. 4 and 5 may be used. It goes without saying that the width modulation circuit is not limited to the one in the second embodiment, but can use a wide variety of conventionally known control circuits. In a pulse power supply device used for processing a workpiece, pulses generated by turning on and off high-speed switching elements are transformer-coupled and supplied to electrodes and workpieces.
A pulse width modulation circuit is used in the circuit that supplies control pulses to the high-speed switching element, and the oscillation frequency is controlled by changing the machining gap state or the output of the state detection signal of the energizing circuit, so the pulse width can be changed. ms～μS
~ns, and can easily control the duty factor τ 0n rOO+τoff over a wide range of 1 to 99%. Therefore, the device of the present invention can be used for electrolytic machining and electrical processing in the pulse width or ns range. From plating, electric discharge low temperature sintering, spot welding, etc.
Widely used as a multipurpose pulser for micro welding, micro stud machining, electrical discharge machining, etc. with pulse widths in the μs range, and even high frequency processing such as finishing electrical discharge machining with pulse widths in the ns range, wire cut electrical discharge machining, laser processing, etc. It is possible.

Since the repetition frequency of the generated pulses is controlled by the detection signal of the machining gap state, it is possible to respond quickly to changes in machining conditions, especially in high-frequency electric discharge machining and wire cutting. It is highly effective as a pulser for electrical discharge machining, laser machining, etc.

Further, since the pulse train for processing is converted into a pulse output suitable for the purpose of processing by a pulse transformer and supplied, extremely efficient processing can be achieved.

Furthermore, since the present invention is provided with a control circuit that controls the basic high-speed pulse train intermittently based on the state detection signal of the machining gap or its current-carrying circuit, it is possible to utilize this intermittent high-frequency pulse. Therefore, especially in electrolytic machining, electrical discharge machining, racer machining, etc. in which machining debris, gas, precipitates, etc. are generated in the machining gap, the machining layer, etc. must be removed, cooled, arc extinguished, etc. during the interruption period of the pulse train. This allows for stable processing, as well as spot welding, micro welding,
In micro stud processing, etc., stable welding control can be performed due to the cooling effect during the interruption period.

As described above, in the present invention, by controlling the pulse width, duty factor, and repetition frequency of the basic pulse, and by controlling the intermittent control of the basic high-frequency pulse train, the processing pulses can be arbitrarily controlled in a variety of ways and precisely. It is possible to perform fine control over a wide range of pulse widths up to m5-ns and frequencies up to about l-100MHz. Therefore, for example, in electrolytic machining, it is extremely effective against short circuits in the machining gap. In electroplating, it is possible to improve the coverage and perform uniform plating, and in discharge sintering, it is easy to sinter at a low temperature for a short time, and the sintering conditions can be finely controlled. In addition, spot welding prevents electrode friction, and micro welding makes it easy to form a uniform coating layer with fine surface roughness. In micro stud machining, desired protrusions can be formed discretely easily, and in ram type electric discharge machining and wire cut electric discharge machining, the pulse width, duty factor, and repetition frequency of the machining pulse can be controlled arbitrarily. It also makes it possible to easily and precisely control laser oscillation.

Further, in the present invention, two or more pulse input windings are provided on the primary side of the coupling transformer, a pulser is provided on each winding, and the output winding on the secondary side is configured so that it can be used for switching or parallel use. The line can be configured to have two or more output connection taps from high voltage to low voltage and can be configured to switch between them, making it possible to obtain any output from high voltage and low current to low voltage and large current, making it suitable for electrolytic processing, electrical processing, etc. It has the effect of being able to be used for multiple purposes such as plating, sintering, spot welding, micro welding, stud machining, electrical discharge machining, wire cut electrical discharge machining, and racer machining.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing the configuration of an electric discharge machining apparatus equipped with a power supply device according to the present invention, FIGS. 2 and 3 are time charts illustrating the operation of the pulse width control circuit, and FIGS. 3 to 8 9 are circuit diagrams showing other different embodiments, and FIG. 9 is a time chart explaining the operation thereof. 1---11---------Pulse transformer 2---
−・−−～−−−−Switching element 3−−−・−−−
1 DC power supply 4 --- 1 --- Machining electrode 5, --- 1 Workpiece 6 --- 1 --- Machining gap 7, --- 1 Rectifier circuit 8 --- Orthogonal changeover switch 9, io--------Resistor 11 - - Synchronous pulse shaping circuit 12 -
・ - Sawtooth wave generation circuit 13, l 4- - Photocoupler 5.22.25 6--・-・ 7-1-・ 8- ・ 21.24.26 ・Arithmetic control circuit current detection circuit ・Comparator driver pulse oscillator Monostable Element - Gate Circuit Voltage Detection Circuit Patent Applicant Agent of INR Research Institute Co., Ltd. (7524) Shotabe Mogami

Claims (1)

[Scope of Claims] (1) In a pulse power supply device for energization processing, which comprises a switching element connected in series to a DC power source and an output terminal of the switching element connected to the primary winding of a coupling transformer, the switching element controls the A pulse oscillation circuit for supplying pulses, a circuit for detecting the machining state, and a circuit for controlling the duty factor and repetition frequency of the control pulse based on the detection signal of the machining state detection circuit. The above-mentioned pulse power supply device for electrical processing. (2) The pulse oscillation circuit controls the oscillation frequency of the sawtooth wave generation circuit, the comparator that compares the output of the sawtooth wave generation circuit with the energization state detection circuit and the output of the sawtooth wave generation circuit, and generates a magnitude discrimination signal. A pulse power supply device for current processing according to claim 1, comprising a circuit. (3) For current processing according to claim 1 or 2, wherein the coupling transformer has a plurality of pulse input windings on the primary side and a plurality of output connection taps on the secondary side. Pulse power supply. (4) In a pulse power supply device for current-carrying processing, which is constructed by connecting a switching element in series to a DC power source and connecting its output terminal to the primary winding of a coupling transformer, a high-frequency pulse is used to supply control pulses to the switching element. an oscillation circuit; a low-frequency pulse oscillation circuit that oscillates a low-frequency pulse from the high-frequency pulse oscillation circuit and controls the output of the pulse oscillation circuit by its output; a circuit that detects a machining state; and a detection circuit that detects a machining state. The above-mentioned pulse power supply device for energization machining is characterized in that a circuit is provided for controlling the duty factor and repetition frequency of the low-frequency pulse using a signal. (5) The low frequency pulse oscillation circuit includes a sawtooth wave generation circuit, a comparator that compares the output of the sawtooth wave generation circuit with the energization state detection circuit, and generates a signal to determine the magnitude thereof, and A pulse power supply device for electrical machining according to claim 4, comprising a control circuit. (6) The current processing according to claim 4 or 5, wherein the coupling transformer has a plurality of pulse input windings on the primary side and a plurality of output connection taps on the secondary side. Pulse power supply device for use.