CN1725620A - AC-DC two-purpose high voltage small current power supply - Google Patents
AC-DC two-purpose high voltage small current power supply Download PDFInfo
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- CN1725620A CN1725620A CN 200410060420 CN200410060420A CN1725620A CN 1725620 A CN1725620 A CN 1725620A CN 200410060420 CN200410060420 CN 200410060420 CN 200410060420 A CN200410060420 A CN 200410060420A CN 1725620 A CN1725620 A CN 1725620A
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Abstract
A high voltage small current power supply used for both AC and DC is prepared as using multi-secondary winding high frequency transformer as high frequency isolation transformer with its primary being connected to low voltage rectifying inversion power circuit , connecting each secondary winding to a high voltage module circuit with its output end being connecting to voltage - current sampling resistance , connecting the sampling voltage - current to sampling fiber interface of control circuit , outputting voltage command signal by high voltage module control fiber interface and outputting pulse width modulation signal to said inversion power circuit by control circuit .
Description
Technical field
The invention belongs to the high voltage-small current power power-supply, can be used as the driving source of tests such as high die pressing product such as lightning arrester, high-tension cable, high-voltage switch gear.
Background technology
Existing high voltage driving source all can only output dc voltage or can only output AC voltage, and the power cell of high voltage direct current driving source and high-voltage alternating driving source can not be general, and volume is excessive.In order to satisfy on-the-spot test requirement to high die pressing product, need a kind ofly can export high-voltage dc voltage, can export the High AC voltage (driving source of frequency range 0.1Hz～120Hz) again.
Summary of the invention
The object of the present invention is to provide a kind of high voltage-small current power power-supply that can AC/DC.
For achieving the above object, the technical solution used in the present invention is: the little current power power supply of a kind of AC and DC dual-purpose high voltage, it is by lower pressure rectifier inverter power element circuit, high-frequency isolation transformer, a plurality of high-pressure modular circuit and control circuit are formed, high-frequency isolation transformer is many secondary winding high frequency transformer, its former edge joint lower pressure rectifier inverter power element circuit output, each secondary winding connects a high-pressure modular circuit, each high-pressure modular circuit is by the AC/DC/AC power cell, step-up transformer, rectification circuit and optical fiber interface and control circuit are formed, optical fiber interface and control circuit are connected with the controlled end of AC/DC/AC power cell, the its corresponding secondary winding of the input termination of AC/DC/AC power cell, its former limit of output termination step-up transformer, the step-up transformer secondary connects rectification circuit, the rectification circuit output end series connection of each high-pressure modular circuit, output at rectification circuit also is connected to divider resistance, the output of a high-pressure modular circuit is connected to output voltage sample resistance and output current sample resistance therein, output voltage sample resistance and above-mentioned divider resistance are composed in series bleeder circuit, voltage sampling end and current sampling end connect the voltage to frequency conversion circuit through amplifying circuit respectively, the output termination optical fiber interface and the control circuit of voltage to frequency conversion circuit, control circuit comprises CPU and coupled pulse-width signal interface, sampling optical fiber interface and high-pressure modular control optical fiber interface, the sampling optical fiber interface of the electric current and voltage sampled signal output connection control circuit of above-mentioned optical fiber interface and control circuit, high-pressure modular control optical fiber interface is connected to AC/DC/AC power cell output voltage instruction signal with the optical fiber interface and the control circuit of each high-pressure modular circuit respectively by optical fiber, and control circuit is connected to its output pulse width modulation signal with the controlled end of lower pressure rectifier inverter power element circuit simultaneously.
Described lower pressure rectifier inverter power element circuit is made up of the half-bridge inversion circuit that rectifier bridge, low pass filter and power device constitute, the low-pass filter of output termination of rectifier bridge, the output termination half-bridge inversion circuit of low pass filter.
The step-up transformer of described each high-pressure modular circuit is formed by former limit several step-up transformers connected with each other, and the secondary of each step-up transformer respectively is connected to a rectification circuit, and the output of rectification circuit is connected in series.
The full bridge inverter that buck circuit that described AC/DC/AC power cell is made of rectifier bridge, two low pass filters, semiconductor device and power device constitute is formed, two low pass filters are connected between rectifier bridge, the chopper circuit respectively and chopper circuit, full bridge inverter between.
The high-pressure modular of the input termination whole system control circuit of optical fiber interface control optical fiber interface in optical fiber interface and the control circuit, the output of optical fiber interface connects subtracter through low pass filter, the voltage sampling end of the input termination AC/DC/AC power cell of resistance pressure-dividing network, output connects subtracter through voltage follower, the output termination of subtracter stagnates chain rate than the controller input, and the chain rate that stagnates connects photoelectrical coupler than controller output end.
Separate by insulation board between the described high-pressure modular.Each secondary winding of high-frequency isolation transformer all adopts the high-tension cable coiling.
The present invention adopts identical power circuit can the output amplitude galvanic current to press, again can the adjustable alternating voltage of output frequency, reduced the volume of power power-supply greatly, and satisfied the on-the-spot test requirement of high die pressing product.The present invention has realized the electrical isolation of input and output by adopting many secondary of high frequency winding transformer.High voltage power output unit module of the present invention adopts pulse amplitude modulation (PAM) technology, can realize direct voltage or the continuous adjustable output of alternating voltage by programming, the ac output voltage frequency can be regulated continuously at 0.1Hz～120Hz, and voltage and frequency accuracy be better than ± and 1%.Because the present invention has adopted modular construction, therefore can be combined into different output voltage high pressure driving sources such as 60kV, 120kV, 200kV by the high voltage power unit module number of increase and decrease overlapped in series.
Description of drawings
Fig. 1 is a general principles block diagram of the present invention;
Fig. 2 is the circuit theory diagrams of lower pressure rectifier inverter power element circuit;
Fig. 3 is the high-pressure modular circuit theory diagrams with sampling feedback circuit;
Fig. 4 is high-pressure modular circuit theory diagrams of not establishing the sampling feedback circuit;
Fig. 5 is the circuit theory diagrams of AC/DC/AC circuit;
Fig. 6 is the B point voltage waveform schematic diagram that amplitude changes by sinusoidal rule among Fig. 5;
Fig. 7 is a step-up transformer original edge voltage waveform schematic diagram;
Fig. 8 is the optical fiber interface of high-pressure modular and the circuit theory diagrams of control circuit;
Fig. 9 is the control circuit theory diagram of whole system.
Embodiment
Below to realize that 120kV is output as example and introduces specific implementation.As shown in Figure 1, the present invention is that 12KV high-pressure modular 1～10 and control circuit are formed by lower pressure rectifier inverter power element circuit, high-frequency isolation transformer BT, ten high-pressure modular circuit on the whole.High-frequency isolation transformer BT is many secondary winding high frequency transformer, its former edge joint lower pressure rectifier inverter power element circuit output, and each secondary winding connects a high-pressure modular circuit.Isolate by adopt many windings high frequency transformer at input side, each secondary winding with one independently the 12kV high-pressure modular link to each other, separate by insulation board between each 12kV high-pressure modular, the secondary winding all adopts the coiling of 125kV high-tension cable, the isolation fully between the electric insulation between so just having realized input and having exported and 10 the 12kV high-pressure modulars.For the volume that reduces high-frequency isolation transformer BT and reduce difficulty of processing, by lower pressure rectifier inverter power element circuit the 50Hz/220V input voltage is transformed into the 20kHz square-wave voltage, because the raising of input voltage frequency, the volume of this transformer also greatly reduces.
As shown in Figure 2, this comprises rectification and two links of inversion lower pressure rectifier inverter power element circuit, the half-bridge inversion circuit that the LC low pass filter that constitutes by D1～D4 rectifier bridge, by L1, C22, C23 and power device Q1, Q2 constitute is formed, the output termination LC filter of rectifier bridge, the output termination half-bridge inversion circuit of LC filter.The 220V/50Hz alternating current obtains direct voltage through diode rectification and LC filtering earlier, obtains the 20kHz high frequency square wave voltage through half-bridge inversion circuit again.The two-way pulse-width signal (PWM) that is sent by control circuit of opening/turn-off of power device Q1, Q2 is controlled among the figure.
Shown in Fig. 3,4, each high-pressure modular circuit is formed by AC/DC/AC power cell, step-up transformer, rectification circuit and optical fiber interface and control circuit.As shown in Figure 3, the step-up transformer of first high-pressure modular circuit is made up of former limit ten step-up transformer T1～T10 connected with each other, the step-up transformer of other high-pressure modular circuit is made up of former limit ten step-up transformer T11～T20 connected with each other, the secondary of each step-up transformer respectively is connected to a rectification circuit, and the output of rectification circuit is connected in series.Owing to all realized electrical isolation between 12kV high-pressure modular and input and the module, the design of this module outlet side isolating transformer only need consider by direct current 12kV, i.e. V
N/ N (V
NBe rated output voltage, N is a number of modules).12kV high-pressure modular outlet side adopts high-frequency step-up transformer to isolate, if use single transformer to boost, supposes that step-up ratio is 300V: 12kV=1: 40, and then step-up ratio is 40, if secondary distributed capacitance is C, converts former limit and just becomes 40
2* C=1600 * C, this electric capacity will increase the switching loss of former limit power device and cause transformer secondary wave distortion.The present invention adopts the i.e. connected mode shown in Fig. 3,4 of a plurality of transformers at outlet side, each small transformers step-up ratio is 4, rectification output series connection is boosted, the distributed capacitance of converting former limit has only original 1/10th, thereby effectively reduced the influence of step-up transformer distributed capacitance, be not easy to cause the overcurrent of former limit power circuit.
As shown in Figure 5, the full bridge inverter that the LC low pass filter that the AC/DC/AC power cell constitutes respectively by D5～D8 rectifier bridge, by L2, C25 and L3, C26, the buck circuit that MOSFET semiconductor device Q3, Q4 constitute and MOSFET power device Q5～Q8 constitute is formed, the L2C25 low pass filter is connected between rectifier bridge and the chopper circuit, the L3C26 low pass filter is connected between chopper circuit and the full bridge inverter, C24 is noninductive absorption electric capacity among the figure, and C27 is a capacitance.The direct voltage that the high frequency square wave voltage input of lower pressure rectifier inverter power element circuit output obtains fluctuating through diode rectifier bridge rectification and LC filtering, the buck circuit that constitutes through Q3, Q4 converts the controlled direct voltage of amplitude to again.When high pressure of the present invention is output as direct voltage, the B point is pressed for galvanic current among Fig. 5, when being output as AC120kV (peak-to-peak value), the B point changes by sinusoidal rule for amplitude, the frequency of wave component is can be adjustable continuously in 0.1Hz～120Hz scope under the control of control circuit, be output as example with the 50Hz interchange, B point waveform as shown in Figure 6.The full bridge inverter that above-mentioned voltage constitutes via Q5～Q8 again is reverse into the square-wave voltage output of 20kHz, so the original edge voltage of step-up transformer T1～T10, T11～T20 is the high-frequency ac square-wave voltage, as shown in Figure 7.
Optical fiber interface and control circuit and the controlled end of AC/DC/AC power cell are that the gate pole of Q3, Q4 and Q5～Q8 is connected.Its corresponding high-frequency isolation transformer BT secondary of the input termination winding of AC/DC/AC power cell, its output termination step-up transformer T1～T10 and the former limit of T11～T20, the secondary of step-up transformer T1～T10 and T11～T20 connects rectification circuit.
The series connection of the rectification circuit output end of high-pressure modular circuit 1～10 also is connected to divider resistance R1～R10 and R11～R20 respectively at the output of rectification circuit.Divider resistance can adopt high withstand voltage high resistance measurement, also can adopt general resistance.Because high voltage source generally requires plus earth, therefore in 12kV high-pressure modular circuit 1, be provided with output voltage and output current detection circuit, as shown in Figure 3, output at high-pressure modular circuit 1 is connected to output voltage sample resistance Rv and output current sample resistance Ri, the withstand voltage high resistance measurement R1～R10 of output voltage sample resistance Rv and above-mentioned height is composed in series bleeder circuit, voltage sampling end and current sampling end meet voltage to frequency conversion circuit VFC through amplifying circuit Amp respectively, output termination optical fiber interface and the control circuit of voltage to frequency conversion circuit VFC.Bleeder circuit feeds back to the sampling amplifying element according to certain voltage ratio with the electric current and voltage sampled signal, after the amplifying circuit Amp processing through high input impedance, after voltage to frequency conversion circuit VFC carries out voltage to frequency conversion, obtain the pulse signal of frequency and the proportional variation of feedback signal amplitude, again after optical fiber interface and control circuit carry out opto-electronic conversion by Optical Fiber Transmission to control circuit.Optical fiber interface and control circuit adopt the HFBR1521/2521 of AT company, and voltage-to-frequency converter adopts the AD7742 (2.75MHz changes output frequency) of AD company.When the present invention exports for 120Hz AC, 24 points of ripple sampling weekly, precision can reach 10.There is not testing circuit in other 9 12kV high-pressure modulars, as shown in Figure 4.
Shown in Fig. 1,9, control circuit comprises CPU and coupled pulse-width signal (PWM) interface, sampling optical fiber interface P2 and high-pressure modular control optical fiber interface.The sampling optical fiber interface of the electric current and voltage sampled signal output connection control circuit of optical fiber interface in the above-mentioned high-pressure modular 1 and control circuit, high-pressure modular control optical fiber interface is connected to AC/DC/AC power cell output voltage instruction signal with the optical fiber interface and the control circuit of each high-pressure modular circuit respectively by optical fiber, and control circuit is connected to its output pulse width modulation signal with the controlled end of lower pressure rectifier inverter power element circuit simultaneously.
The sampled signal Vf of output voltage and electric current, If become the level pulse signal by sampling optical fiber interface conversion, finish mould/number conversion by the sequential logical circuit among the field programmable logic circuit FPGA then.CPU reads the sampled value of output voltage and output current, calculates regulation voltage is sent in the back to each 12kV high-pressure modular by optical fiber command signal through control.CPU finishes the control to lower pressure rectifier/inverter power unit by pulse-width signal (PWM) interface circuit among the figure, converts the 50Hz alternating voltage to the 20kHz high frequency square wave voltage.
Realize high-precision voltage output, key is the control to B point voltage among Fig. 5.Each 12kV high-pressure modular of the present invention has independently optical fiber interface and control circuit, the control circuit of whole system passes the failure alarm signal that B point voltage command signal also receives this high-pressure modular of uploading by control optical fiber down to high-pressure modular, and the control circuit of each high-pressure modular is exactly will control the B point voltage to follow the tracks of identical command signal.As shown in Figure 8, control circuit passes down is the equal but adjustable sequence of high frequency pulses of pulsewidth of amplitude, after carrying out opto-electronic conversion, optical fiber interface HFBR1521/2521 inside, connects the subtracter of forming by U2B and peripheral components by obtaining B point voltage command signal behind the RC low pass filter filters out radio-frequency component of forming by R26, C29.Resistance pressure-dividing network sampling B point voltage signal VB by resistance R 21, R22 composition, the B point voltage signal of sampling connects subtracter through the voltage follower that U2A (LM224) forms, subtract each other with B point voltage command signal and to obtain error signal, controlled Q1 after stagnant chain rate that U3A (LM339) and peripheral components are formed is than controller again, the control signal of Q2 switching tube is exported this control signal through photoelectrical coupler OP3 and OP4 respectively.Promptly when error signal surpasses the error higher limit, open Q2, turn-off Q1, reduce the B point voltage; Prescribe a time limit when error signal is lower than under the error, turn-off Q2, open Q1, rising B point voltage, thus make the command voltage signal that passes under each 12kV high-pressure modular tracking Control plate.The control impuls of Q5～Q8 is directly produced by 20KHz clock-signal generator among the figure in the full bridge inverter, B point direct voltage is reverse into the square-wave voltage output of 20kHz.
The plenty hardware resources that also is provided with control circuit can realize the interface with the user very easily, and the user can finish the test of measurand automatically and output test result by programming.
Claims (7)
1, the little current power power supply of a kind of AC and DC dual-purpose high voltage, it is characterized in that, it is by lower pressure rectifier inverter power element circuit, high-frequency isolation transformer, a plurality of high-pressure modular circuit and control circuit are formed, high-frequency isolation transformer is many secondary winding high frequency transformer, its former edge joint lower pressure rectifier inverter power element circuit output, each secondary winding connects a high-pressure modular circuit, each high-pressure modular circuit is by the AC/DC/AC power cell, step-up transformer, rectification circuit and optical fiber interface and control circuit are formed, optical fiber interface and control circuit are connected with the controlled end of AC/DC/AC power cell, the its corresponding secondary winding of the input termination of AC/DC/AC power cell, its former limit of output termination step-up transformer, the step-up transformer secondary connects rectification circuit, the rectification circuit output end series connection of each high-pressure modular circuit, output at rectification circuit also is connected to divider resistance, the output of a high-pressure modular circuit is connected to output voltage sample resistance and output current sample resistance therein, output voltage sample resistance and above-mentioned divider resistance are composed in series bleeder circuit, voltage sampling end and current sampling end connect the voltage to frequency conversion circuit through amplifying circuit respectively, the output termination optical fiber interface and the control circuit of voltage to frequency conversion circuit, control circuit comprises CPU and coupled pulse-width signal interface, sampling optical fiber interface and high-pressure modular control optical fiber interface, the sampling optical fiber interface of the electric current and voltage sampled signal output connection control circuit of above-mentioned optical fiber interface and control circuit, high-pressure modular control optical fiber interface is connected to AC/DC/AC power cell output voltage instruction signal with the optical fiber interface and the control circuit of each high-pressure modular circuit respectively by optical fiber, and control circuit is connected to its output pulse width modulation signal with the controlled end of lower pressure rectifier inverter power element circuit simultaneously.
2, the little current power power supply of AC and DC dual-purpose high voltage as claimed in claim 1, it is characterized in that, described lower pressure rectifier inverter power element circuit is made up of the half-bridge inversion circuit that rectifier bridge, low pass filter and power device constitute, the low-pass filter of output termination of rectifier bridge, the output termination half-bridge inversion circuit of low pass filter.
3, the little current power power supply of AC and DC dual-purpose high voltage as claimed in claim 1 or 2, it is characterized in that, the step-up transformer of described each high-pressure modular circuit is formed by former limit several step-up transformers connected with each other, the secondary of each step-up transformer respectively is connected to a rectification circuit, and the output of rectification circuit is connected in series.
4, the little current power power supply of AC and DC dual-purpose high voltage as claimed in claim 1 or 2, it is characterized in that, the full bridge inverter that buck circuit that described AC/DC/AC power cell is made of rectifier bridge, two low pass filters, semiconductor device and power device constitute is formed, two low pass filters are connected between rectifier bridge, the chopper circuit respectively and chopper circuit, full bridge inverter between.
5, the little current power power supply of AC and DC dual-purpose high voltage as claimed in claim 1 or 2, it is characterized in that, the high-pressure modular of the input termination whole system control circuit of optical fiber interface control optical fiber interface in optical fiber interface and the control circuit, the output of optical fiber interface connects subtracter through low pass filter, the voltage sampling end of the input termination AC/DC/AC power cell of resistance pressure-dividing network, output connects subtracter through voltage follower, the output termination of subtracter stagnates chain rate than the controller input, and the chain rate that stagnates connects photoelectrical coupler than controller output end.
6, the little current power power supply of AC and DC dual-purpose high voltage as claimed in claim 1 or 2 is characterized in that, separates by insulation board between the described high-pressure modular.
7, the little current power power supply of AC and DC dual-purpose high voltage as claimed in claim 1 or 2 is characterized in that, each secondary winding of high-frequency isolation transformer all adopts the high-tension cable coiling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100604205A CN100514820C (en) | 2004-07-22 | 2004-07-22 | AC-DC two-purpose high voltage small current power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100604205A CN100514820C (en) | 2004-07-22 | 2004-07-22 | AC-DC two-purpose high voltage small current power supply |
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| Publication Number | Publication Date |
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| CN1725620A true CN1725620A (en) | 2006-01-25 |
| CN100514820C CN100514820C (en) | 2009-07-15 |
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| CNB2004100604205A Expired - Fee Related CN100514820C (en) | 2004-07-22 | 2004-07-22 | AC-DC two-purpose high voltage small current power supply |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100449924C (en) * | 2006-08-07 | 2009-01-07 | 深圳市计量质量检测研究院 | Digital high-voltage generator with any wave form |
| CN101295936B (en) * | 2007-04-27 | 2011-01-26 | 北京合康亿盛变频科技股份有限公司 | Exterior feeding control power supply of high voltage frequency convertor power unit |
| CN102237803A (en) * | 2010-04-23 | 2011-11-09 | 上海凯世通半导体有限公司 | High-voltage power supply unit |
| CN102638173A (en) * | 2012-04-10 | 2012-08-15 | 四川大学 | Isolated constant amplitude vector alternating current voltage regulator |
| CN103616547A (en) * | 2013-12-05 | 2014-03-05 | 杭州四达电炉成套设备有限公司 | Terminal voltage optical fiber isolating and sampling circuit and method of power semiconductor device |
| CN104486857A (en) * | 2014-12-01 | 2015-04-01 | 广东美的厨房电器制造有限公司 | Electromagnetic heating device and voltage sampling circuit of electromagnetic heating device |
| CN107449970A (en) * | 2017-09-28 | 2017-12-08 | 国网安徽省电力公司检修公司 | Insulaion resistance and the test integrated device of dielectric loss |
| CN108418451A (en) * | 2018-05-03 | 2018-08-17 | 深圳鹏城新能科技有限公司 | A kind of multiple voltage output device of high-frequency isolation |
| CN109039096A (en) * | 2018-08-29 | 2018-12-18 | 浙江双驰电气科技有限公司 | A kind of concrete pump power supply using electrolytic capacitor energy storage |
| CN109950937A (en) * | 2019-04-16 | 2019-06-28 | 诺丁汉(余姚)智能电气化研究院有限公司 | A kind of topological structure of the isolated power inverter of distribution of driving AC load |
| CN112846451A (en) * | 2020-12-26 | 2021-05-28 | 上海沪工焊接集团股份有限公司 | High-frequency control circuit PCB layout method for welding machine |
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2004
- 2004-07-22 CN CNB2004100604205A patent/CN100514820C/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100449924C (en) * | 2006-08-07 | 2009-01-07 | 深圳市计量质量检测研究院 | Digital high-voltage generator with any wave form |
| CN101295936B (en) * | 2007-04-27 | 2011-01-26 | 北京合康亿盛变频科技股份有限公司 | Exterior feeding control power supply of high voltage frequency convertor power unit |
| CN102237803B (en) * | 2010-04-23 | 2015-05-13 | 上海凯世通半导体有限公司 | High-voltage power supply unit |
| CN102237803A (en) * | 2010-04-23 | 2011-11-09 | 上海凯世通半导体有限公司 | High-voltage power supply unit |
| CN102638173A (en) * | 2012-04-10 | 2012-08-15 | 四川大学 | Isolated constant amplitude vector alternating current voltage regulator |
| CN103616547A (en) * | 2013-12-05 | 2014-03-05 | 杭州四达电炉成套设备有限公司 | Terminal voltage optical fiber isolating and sampling circuit and method of power semiconductor device |
| CN103616547B (en) * | 2013-12-05 | 2016-08-24 | 杭州四达电炉成套设备有限公司 | Power semiconductor terminal voltage Fiber isolation sample circuit and method |
| CN104486857A (en) * | 2014-12-01 | 2015-04-01 | 广东美的厨房电器制造有限公司 | Electromagnetic heating device and voltage sampling circuit of electromagnetic heating device |
| CN104486857B (en) * | 2014-12-01 | 2016-04-06 | 广东美的厨房电器制造有限公司 | The voltage sampling circuit of electromagnetic heater and electromagnetic heater |
| CN107449970A (en) * | 2017-09-28 | 2017-12-08 | 国网安徽省电力公司检修公司 | Insulaion resistance and the test integrated device of dielectric loss |
| CN108418451A (en) * | 2018-05-03 | 2018-08-17 | 深圳鹏城新能科技有限公司 | A kind of multiple voltage output device of high-frequency isolation |
| CN109039096A (en) * | 2018-08-29 | 2018-12-18 | 浙江双驰电气科技有限公司 | A kind of concrete pump power supply using electrolytic capacitor energy storage |
| CN109950937A (en) * | 2019-04-16 | 2019-06-28 | 诺丁汉(余姚)智能电气化研究院有限公司 | A kind of topological structure of the isolated power inverter of distribution of driving AC load |
| CN112846451A (en) * | 2020-12-26 | 2021-05-28 | 上海沪工焊接集团股份有限公司 | High-frequency control circuit PCB layout method for welding machine |
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| CN100514820C (en) | 2009-07-15 |
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