CN102545620A - Power supply device used for arc machining - Google Patents
Power supply device used for arc machining Download PDFInfo
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- CN102545620A CN102545620A CN2011103632851A CN201110363285A CN102545620A CN 102545620 A CN102545620 A CN 102545620A CN 2011103632851 A CN2011103632851 A CN 2011103632851A CN 201110363285 A CN201110363285 A CN 201110363285A CN 102545620 A CN102545620 A CN 102545620A
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Abstract
The present invention provides a power supply device used for arc machining, and is characterized by comprising: a DC converting circuit; a full-bridge inverter circuit used for converting a DC voltage into a high-frequency AC voltage; an output control circuit used for controlling the inverter circuit, wherein when an input current is high than a reference current, the inverter circuit is stopped for a set time; a switch element drive circuit used for driving a switch element in response to an output control signal and providing current for an inverse bias capacitor; and a switch control circuit used for making a first switch element and a fourth switch element conduct uncoincidently during a period from 0 to 1/2 period and making a second switch element and a third switch element conduct uncoincidently during a period from 1/2 to 1 period when the inverter circuit is stopped. Therefore, the power supply device of the utility model can solve the problem as follows: when an inverse bias voltage of the switch element driving circuit used for driving the inverter circuit of the power supply device drops, turn-off loss may increase, so that the switch element is degraded.
Description
Technical field
The present invention relates to drive the control of the switch element driver circuit that is built in the inverter circuit in the supply unit.
Background technology
The switch element that is built in the inverter circuit in the arc component processing power source then can produce delay if reverse blas reduces when turn-offing, turn-off loss thereby increase.
Fig. 4 is the electrical connection diagram of the arc component processing power source of prior art.In Fig. 4, the smmothing capacitor C1 that DC transfer circuit is located at the outlet side of No. 1 rectification circuit DR1 by No. 1 rectification circuit DR1 and parallel connection forms.
Inverter circuit INV forms full-bridge through opposed the 1st switch element TR1 to the 4 switch element TR4, is high-frequency ac voltage output afterwards with dc voltage conversion.
Transformer INT will be transformed to the high-frequency ac voltage that is suitable for electric arc processes by the high-frequency ac voltage of inverter circuit INV conversion; No. 2 times rectification circuit DR2 carries out rectification to the output of main transformer INT; Come to produce electric arc via direct current reactor DCL between sacrificial electrode 1 and the machined object M electric power being provided.
1 primary current testing circuit ID shown in Figure 4 detect transformer INT 1 side input current and export as 1 primary current detection signal ID.Output current detection circuit OD detect main transformer INT 2 sides output current and export as output current detection signal Od.1 time overcurrent sensing circuit OCP compares the value of 1 primary current detection signal Id and the value of the illustrated predetermined reference current signal If of omission, if 1 primary current detected value becomes more than the reference current value, then exports over-current detection signal Ocp 1 time.
Output control circuit SC shown in Fig. 4 makes the constant PWM control that comes modulating pulse width of pulse frequency, controls the pulse duration of the 1st output control signal Sc1 and the 2nd output control signal Sc2 of the half period of staggering each other according to output current detection signal Od.Then, if 1 over-current detection signal Ocp of input, then at the appointed time T1 during forbid the output of said the 1st output control signal Sc1 and the 2nd output control signal Sc2.
Fig. 2 has been to use the details drawing of the 1st switch element driver circuit DK1 pulse transformer, shown in for example Fig. 1; The 1st switch element driver circuit DK1 is formed by 1 driving switch element TR5, pulse transformer PT, 2 driving switch element TR6, resistor R 6 and contrary biased electrical container C2; 1 time driving switch element TR5 responds the 1st output control signal Sc1 and conducting; Voltage in response to the conducting of this 1 driving switch element TR5 with regulation is applied on 1 coil of pulse transformer PT; Apply voltage and produce induced voltage according to this, and it is outputed to 2 coils of pulse transformer PT.Next; Cut off 2 times driving switch element TR6 in response to induced voltage; Apply positive bias via 6 pairs of grids that form the 1st switch element TR1 of inverter circuit of resistor R, and to contrary biased electrical container C2 electric current is provided, generate reverse blas via resistor R 5 and resistor R 6.
Fig. 5 is the waveform timing diagram of the action of explanation prior art.In Fig. 5; The waveform of Fig. 5 (A) is represented over-current detection signal Pcp 1 time; The waveform of Fig. 5 (B) is represented the 1st output control signal Sc1; The waveform of Fig. 5 (C) is represented the 2nd output control signal Sc2, and the waveform of Fig. 5 (D) is represented the 1st switching drive signal Dk1, and the waveform of Fig. 5 (E) is represented the 2nd switching drive signal Dk2.
At moment t=t1 shown in Figure 5; After shown in Fig. 5 (B) the 1st output control signal Sc1 becomes high level; 1 driving switch element TR5 conducting of the 1st switch element driver circuit Dk1 shown in Figure 2 is applied to 1 coil N1 of pulse transformer PT with 1 voltage of regulation.And pulse transformer PT then produces induced voltage at 2 coil N2 if be applied in voltage 1 time at 1 coil.
At moment t=t1, cut off 2 times driving switch element TR6 in response to induced voltage, apply positive bias via resistor R 6 to the 1st switch element TR1 that forms inverter circuit, make its conducting.And then, via resistor R 6 electric current is offered contrary biased electrical container C2, and electric current is offered contrary biased electrical container C2 via resistor R 5, (for example-8V) generate reverse blas.
At moment t=t2, after the output of the 1st shown in Fig. 5 (B) control signal Sc1 becomes low level, cut off 1 time driving switch element TR5,1 the coil N1 that stops pulse transformer T1 applies voltage 1 time.
At moment t=t2, after stopping 1 coil N1 to pulse transformer T1 shown in Figure 2 and applying 1 voltage, stop to produce the induced voltage of 2 coil N2.At this moment, if 2 driving switch element T6 conducting, then from positive bias be changed to reverse blas (for example from+16V to-8V), cut off the 1st switch element TR1 shown in Figure 4.
At this moment, at moment t=t2, if electric arc in producing long-time short circuit takes place, 1 overcurrent sensing circuit OCP then shown in Figure 4 detects 1 overcurrent that is formed by long-time short circuit, and exports over-current detection signal Ocp 1 time.Then; Output control circuit SC is behind 1 over-current detection signal Ocp of input; During predetermined time T 1 (for example 2 cycles in inverter cycle); Forbid the output of the 1st output control signal Sc1 and the 2nd output control signal Sc2, the action of inverter circuit is stopped, avoiding thus because the damage of the switch element that the increase of the power consumption of short circuit for a long time causes.
But shown in Fig. 5 (C), if the output disabled time of the 2nd output control signal Sc2 is elongated, then the electric charge of contrary biased electrical container C2 is discharged, thereby causes reverse blas to reduce.
At moment t=t4; The output disabled time T1 of the 1st output control signal Sc1 and the 2nd output control signal Sc2 finishes; At moment t=t5, the output of the 1st shown in Fig. 5 (B) control signal Sc1 becomes high level, and the 1st switch element TR1 is applied in positive bias and conducting.
At moment t6, after the output of the 1st shown in Fig. 5 (B) control signal Sc1 becomes low level, cut off the 1st switch element TR1.At this moment because reverse blas (for example from-8V to-2V) reduce, therefore in the shutoff of the 1st switch element TR1, produces and postpone, thereby the collector current of turn-off power loss and the switch element when turn-offing increases.At this moment, if surpass the permissible range of the switch element that forms inverter circuit, will cause switch element deterioration (for example, patent documentation 1).
Patent documentation 1:JP spy opens clear 59-104830 communique
In the arc component processing power source of prior art shown in Figure 4, if long-time short circuit takes place, then in each switch element that forms inverter circuit, flow through big electric current in electric arc produces, power consumption increases, and causes the damage of switch element.Therefore, for fear of the damage of switch element, in the prior art; When flowing through big electric current in the switch element at inverter circuit; At the appointed time (for example 1 cycle in inverter cycle is to 3 cycles) during, stop the action of inverter circuit, make that the inverter cycle is elongated; Thereby reduce the power consumption of switch element and flow through the generation number of times of big electric current, avoid damaging at switch element.
But if the action dwell time of inverter circuit is elongated, the charging that then forms the contrary biased electrical container of switch element driver circuit will become insufficient, and reverse blas will reduce.And; If reverse blas reduces; Then the turn-off speed of switch element will be slack-off; Inverter circuit begins action if under this state, remove long-time short circuit, and the collector current of the switch element when then first shutoff loss and shutoff can significantly increase, and produces the problem of the deterioration that causes switch element.
Summary of the invention
Therefore, in the present invention, even purpose is to provide long-time short circuit takes place in electric arc produces, overcurrent protection also can be given full play to the arc component processing power source of function.
In order to solve above-mentioned problem, the 1st invention is a kind of arc component processing power source, is characterised in that to possess: DC transfer circuit, and it carries out rectification, level and smooth to commercial ac power source, thus output dc voltage; The inverter circuit of full-bridge, it is a high-frequency ac voltage with said dc voltage conversion, and is made up of the 1st switch element to the 4 switch elements; Transformer, it is transformed to said high-frequency ac voltage the voltage that is suitable for load; Output control circuit, the output control signal of the said inverter circuit of its output control, and after the input current of said transformer becomes more than the predetermined reference current, stop the predetermined time of said inverter circuit; And switch element driver circuit; 1 side of pulse transformer applies assigned voltage in response to said output control signal for it; At 2 side output induced voltages; And drive said switch element and to contrary biased electrical container electric current is provided via resistance, also possess: ON-OFF control circuit, when it stops at said inverter circuit; Make said the 1st switch element and the 4th switch element during 0 to 1/2 cycle, not overlap the ground conducting, make said the 2nd switch element and the 3rd switch element during 1/2 to 1 cycle, not overlap the ground conducting.
The 2nd invention is the arc component processing power source on the basis of the 1st invention; Be characterised in that; It was 0 to 1/4 cycle that said ON-OFF control circuit makes the ON time of said the 1st switch element; The ON time that makes said the 2nd switch element was 1/4 to 2/4 cycle, and the ON time that makes said the 3rd switch element was 2/4 to 3/4 cycle, and the ON time that makes said the 4th switch element was 3/4 to 4/4 cycle.
The 3rd invention is the arc component processing power source on the basis of the 1st invention, is characterised in that when said inverter circuit stopped, the minimum ON time of said switch element was 5% of 1 cycle.
(effect of invention)
In order to solve above-mentioned problem; Long-time short circuit takes place and when flowing through big electric current in the switch element at inverter circuit in the 1st invention in electric arc produces; Stop the inverter circuit stipulated time; And in stopping, providing electric charge to prevent that reverse blas from reducing to the contrary biased electrical container that forms switch element driver circuit; Therefore can not produce delay in the turn-off speed when removing long-time short circuit and begin the inverter circuit action, can suppress the first shutoff loss and the increase of collector current, can avoid the deterioration or the damage of switch element.
The 2nd invention and the 3rd invention are set at suitable value through the duty ratio with inverter, can electric charge be provided fully to contrary biased electrical container, can reverse blas be maintained suitable value.
Description of drawings
Fig. 1 is the electrical connection diagram of the arc component processing power source of execution mode 1 of the present invention.
Fig. 2 is the details drawing of the 1st switch element driver circuit shown in Figure 1.
Fig. 3 is the waveform timing diagram of the action of explanation execution mode 1.
Fig. 4 is the electrical connection diagram of the arc component processing power source of prior art.
Fig. 5 is the waveform timing diagram of the action of explanation prior art.
The explanation of symbol
1 sacrificial electrode
The AC commercial ac power source
The C1 smmothing capacitor
The DS ON-OFF control circuit
Ds1 the 1st switch controlling signal
Ds2 the 2nd switch controlling signal
Ds3 the 3rd switch controlling signal
Ds4 the 4th switch controlling signal
The DCL direct current reactor
No. 1 rectification circuit of DR1
No. 2 rectification circuits of DR2
DK1 the 1st switch element driver circuit
DK2 the 2nd switch element driver circuit
DK3 the 3rd switch element driver circuit
DK4 the 4th switch element driver circuit
Dk1 the 1st switch element drive signal
Dk2 the 2nd switch element drive signal
Dk3 the 3rd switch element drive signal
Dk4 the 4th switch element drive signal
IR output current initialization circuit
Ir output current setting signal
The INT transformer
The OD output current detection circuit
Od output current detection signal
1 overcurrent sensing circuit of OCP
1 over-current detection signal of Ocp
The M machined object
The SC main control circuit
Sc1 the 1st output control signal
Sc2 the 2nd output control signal
The TH welding torch
The TS starting switch
The Ts enabling signal
TR1 the 1st switch element
TR2 the 2nd switch element
TR3 the 3rd switch element
TR4 the 4th switch element
Embodiment
Fig. 1 is the electrical connection diagram of the arc component processing power source of execution mode 1 of the present invention.In Fig. 1, represent to carry out same action with the formation thing of the electrical connection diagram same-sign of prior art shown in Figure 4, therefore omit explanation, the formation thing that symbol is different only is described.
Output control circuit SC shown in Figure 1 makes the constant PWM control that comes modulating pulse width of pulse frequency, controls the pulse duration of the 1st output control signal Sc1 and the 2nd output control signal Sc2 of the half period of staggering each other according to output current detection signal Od.And; If 1 over-current detection signal Ocp of input; Then export the predetermined time T 1 phase control signal Sct in (for example 1 cycle in inverter cycle is to 3 cycles); And during output phase control signal Sct, the duty ratio of the 1st output control signal Sc1 and the 2nd output control signal Sc2 is fixed as predetermined value (for example, 5% to 25%) exports.
ON-OFF control circuit DS shown in Figure 1 exports the 1st switch controlling signal Ds1 and the 4th switch controlling signal Ds4 in response to the 1st output control signal Sc1; Drive the 1st switch element driver circuit DK1 and the 4th switch element driver circuit DK4; Export the 2nd switch controlling signal Ds2 and the 3rd switch controlling signal Ds3 in response to the 2nd output control signal Sc2; Drive the 2nd switch element driver circuit DK2 and the 3rd switch element driver circuit DK3; And when input phase control signal Sct; For example make the 4th switch controlling signal Ds4 with respect to the 1st switch controlling signal Ds1 1/4 periodic phase that is shifted, make the 3rd switch controlling signal Ds3 with respect to the 2nd switch controlling signal Ds2 be shifted 1/4 periodic phase, output afterwards.
Fig. 3 is the waveform timing diagram of the action of explanation execution mode 1 of the present invention.
In Fig. 3, the waveform of Fig. 3 (A) is represented over-current detection signal Ocp 1 time, and the waveform of Fig. 3 (B) is represented phase control signal Sct; The waveform of Fig. 3 (C) is represented the 1st output control signal Sc1; The waveform of Fig. 3 (D) is represented the 2nd output control signal Sc2, and the waveform of Fig. 3 (E) is represented the 1st switch controlling signal Ds1, and the waveform of Fig. 3 (F) is represented the 2nd switch controlling signal Ds2; The waveform of Fig. 3 (G) is represented the 3rd switch controlling signal Ds3; The waveform of Fig. 3 (H) is represented the 4th switch controlling signal Ds4, and the waveform of Fig. 3 (I) is represented the 1st switching drive signal Dk1, and the waveform of Fig. 3 (J) is represented the 2nd switching drive signal Dk2.
Next, action of the present invention is described.
At moment t=t1 shown in Figure 3, after the output of the 1st shown in Fig. 3 (C) control signal Sc1 became high level, ON-OFF control circuit DS responded the high level of the 1st output control signal Sc1 and exports the 1st switch controlling signal Ds1 and the 4th switch controlling signal Ds4.
In that the 1st switch element driver circuit DK1 shown in Figure 2 is imported the 1st switch controlling signal Ds1 after 1 driving switch element TR5 conducting; 1 coil N1 of 1 driving switch element TR5 pulse transformer PT applies 1 voltage of regulation; Pulse transformer PT produces induced voltages at 2 coil N2 after 1 coil N1 is applied in 1 voltage.Then; Cut off 2 driving switch element TR6 in response to induced voltage; Apply positive bias via resistor R 6 to the grid of the 1st switch element TR1 that forms inverter circuit, and to contrary biased electrical container C2 electric current is provided, (for example-8V) generate reverse blas via resistor R 5 and resistor R 6.And the 4th switch element driver circuit DK4 also carries out and above-mentioned identical action, therefore omits explanation.
At moment t=t2, after the 1st switch controlling signal Ds1 shown in Fig. 3 (C) becomes low level, stop to apply voltage 1 time at 1 coil N1 of the pulse transformer PT of the 1st switch element driver circuit DK1, the generation of the induced voltage of 2 coil N2 also stops.At this moment, 2 driving switch element TR6 conducting, such shown in Fig. 3 (I), from positive bias be changed to reverse blas (for example from+16V to-8V), cut off the 1st switch element TR1.
At moment t=t2, if long-time short circuit takes place in electric arc produces, then 1 overcurrent sensing circuit OCP detects 1 overcurrent that long-time short circuit causes, and as 1 over-current detection signal Ocp output.Then; Output control circuit SC is in response to 1 over-current detection signal; Export the phase control signal Sct of predetermined time T 1; And during output phase control signal Sct, the duty ratio of the 1st output control signal Sc1 and the 2nd output control signal Sc2 is set in predetermined value (for example 10%).
ON-OFF control circuit DS shown in Figure 1 is after moment t=t3 phase control signal Sct becomes high level; At moment t=t4; Make the 3rd switch controlling signal Ds3 shown in Fig. 3 (G) with respect to 1/4 periodic phase that is shifted of the 2nd switch controlling signal Ds2 shown in Fig. 3 (F); At moment t=t6, make the 4th switch controlling signal Ds4 shown in 3 (H) with respect to 1/4 periodic phase that is shifted of the 1st switch controlling signal Ds1 shown in Fig. 3 (E), afterwards output.
If make the 3rd switch controlling signal Ds3 with respect to the 2nd switch controlling signal Ds2 shown in Figure 3 1/4 periodic phase that is shifted, then the 2nd switch element TR2 and the 3rd switch element TR3 become dissengaged positions, and inverter circuit stops action.At this moment, the 2nd switch element driver circuit DK2 applies the voltage of regulation in response to 1 coil of the 2nd switch controlling signal Ds2 pulse transformer PT, applies voltage in response to this and produces induced voltage, and export to 2 coils of pulse transformer PT.Then; Cut off 2 times driving switch element TR6 in response to induced voltage; Apply positive bias via 6 pairs of grids that form the 1st switch element TR1 of inverter circuit of resistor R, and to contrary biased electrical container C2 electric current is provided, (for example-8V) keep reverse blas via resistor R 5 and resistor R 6.
Maintain in the output time of phase control signal Sct, the reverse blas that the 1st switch element driver circuit DK1, the 3rd switch element driver circuit DK3 and the 4th switch element driver circuit DK4 also carry out the same action shown in above-mentioned (for example-8V).
At moment t=t11; After phase control signal Sct became low level, ON-OFF control circuit DS was passed to PWM control from phase control, at moment t=t12; After the 1st switch controlling signal Ds1 and the 4th switch controlling signal Ds4 become high level, the 1st switch element TR1 and the 4th switch element TR4 conducting.
Next, at moment t=t13, after the 1st switch controlling signal Ds1 and the 4th switch controlling signal Ds4 become low level, cut off the 1st switch element TR1 and the 4th switch element TR4.At this moment, (for example-8V), therefore, in the turn-off speed of the 1st switch element TR1 and the 4th switch element TR4, can not produce delay owing to keep reverse blas.
As stated; In electric arc produces because short circuit for a long time when producing 1 overcurrent; Inverter circuit is passed to phase control from PWM control; Reverse blas through under phase control, imposing on switch element maintains assigned voltage, can suppress phase control and finish and be passed to the first shutoff loss of PWM control and the increase of the collector current when turn-offing, the protection that has improved switch element.
In above-mentioned,, then reverse blas can be roughly kept, in the turn-off speed of switch element, delay can be do not produced if the duty ratio of the 1st output control signal Sc1 and the 2nd output control signal Sc2 is made as 5%.
Claims (3)
1. arc component processing power source possesses:
DC transfer circuit, it carries out rectification, level and smooth to commercial ac power source, thus output dc voltage:
The inverter circuit of full-bridge, it is a high-frequency ac voltage with said dc voltage conversion, and is made up of the 1st switch element to the 4 switch elements;
Transformer, it is transformed to said high-frequency ac voltage the voltage that is suitable for load;
Output control circuit, the output control signal of the said inverter circuit of its output control, and after the input current of said transformer becomes more than the predetermined reference current, stop the predetermined time of said inverter circuit; With
Switch element driver circuit, 1 side of pulse transformer applies assigned voltage in response to said output control signal for it, exports induced voltages 2 sides, and drives said switch element and to contrary biased electrical container electric current is provided via resistance,
Said arc component processing power source also possesses:
ON-OFF control circuit; When it stops at said inverter circuit; Make said the 1st switch element and the 4th switch element during 0 to 1/2 cycle, not overlap the ground conducting, make said the 2nd switch element and the 3rd switch element during 1/2 to 1 cycle, not overlap the ground conducting.
2. arc component processing power source according to claim 1 is characterized in that,
It was 0 to 1/4 cycle that said ON-OFF control circuit makes the ON time of said the 1st switch element; The ON time that makes said the 2nd switch element was 1/4 to 2/4 cycle; The ON time that makes said the 3rd switch element was 2/4 to 3/4 cycle, and the ON time that makes said the 4th switch element was 3/4 to 4/4 cycle.
3. arc component processing power source according to claim 1 is characterized in that,
When said inverter circuit stopped, the minimum ON time of said switch element was 5% of 1 cycle.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010260905A JP5584101B2 (en) | 2010-11-24 | 2010-11-24 | Arc machining power supply |
| JP2010-260905 | 2010-11-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102545620A true CN102545620A (en) | 2012-07-04 |
| CN102545620B CN102545620B (en) | 2015-07-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110363285.1A Active CN102545620B (en) | 2010-11-24 | 2011-11-16 | Power supply device used for arc machining |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP5584101B2 (en) |
| CN (1) | CN102545620B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10483873B2 (en) | 2018-03-08 | 2019-11-19 | Omron Corporation | Power conversion apparatus and control method of inverter |
| CN110679076A (en) * | 2017-05-29 | 2020-01-10 | 松下知识产权经营株式会社 | Power supply device for arc machining and method for controlling power supply device for arc machining |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112867581A (en) * | 2018-08-24 | 2021-05-28 | 罗伯特·博世有限公司 | Laser cutting machine and safe electric power system for same |
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| JPS63276319A (en) * | 1987-05-07 | 1988-11-14 | Origin Electric Co Ltd | Drive circuit for semiconductor switching element |
| CN87101347A (en) * | 1987-06-11 | 1988-12-28 | 张作庆 | The high-voltage inverted electric welding machine of mining transistor DC |
| JPH04217877A (en) * | 1990-12-19 | 1992-08-07 | Hitachi Seiko Ltd | Overcurrent protective device for inverter |
| JPH09140122A (en) * | 1995-11-10 | 1997-05-27 | Nippon Electric Ind Co Ltd | Igbt driving reverse bias circuit |
| CN1663728A (en) * | 2004-03-01 | 2005-09-07 | 株式会社大亨 | Soft-switching half-bridge inverter power supply system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6498321B1 (en) * | 2001-04-09 | 2002-12-24 | Lincoln Global, Inc. | System and method for controlling an electric arc welder |
| JP2010284709A (en) * | 2009-06-15 | 2010-12-24 | Daihen Corp | Power source device |
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2010
- 2010-11-24 JP JP2010260905A patent/JP5584101B2/en active Active
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63276319A (en) * | 1987-05-07 | 1988-11-14 | Origin Electric Co Ltd | Drive circuit for semiconductor switching element |
| CN87101347A (en) * | 1987-06-11 | 1988-12-28 | 张作庆 | The high-voltage inverted electric welding machine of mining transistor DC |
| JPH04217877A (en) * | 1990-12-19 | 1992-08-07 | Hitachi Seiko Ltd | Overcurrent protective device for inverter |
| JPH09140122A (en) * | 1995-11-10 | 1997-05-27 | Nippon Electric Ind Co Ltd | Igbt driving reverse bias circuit |
| CN1663728A (en) * | 2004-03-01 | 2005-09-07 | 株式会社大亨 | Soft-switching half-bridge inverter power supply system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110679076A (en) * | 2017-05-29 | 2020-01-10 | 松下知识产权经营株式会社 | Power supply device for arc machining and method for controlling power supply device for arc machining |
| CN110679076B (en) * | 2017-05-29 | 2021-03-26 | 松下知识产权经营株式会社 | Power supply device for arc machining and method for controlling power supply device for arc machining |
| US10483873B2 (en) | 2018-03-08 | 2019-11-19 | Omron Corporation | Power conversion apparatus and control method of inverter |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5584101B2 (en) | 2014-09-03 |
| JP2012115009A (en) | 2012-06-14 |
| CN102545620B (en) | 2015-07-15 |
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