CN103586564B - Based on the Pulse MIG Welding Power Source system of STM32 - Google Patents
Based on the Pulse MIG Welding Power Source system of STM32 Download PDFInfo
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- CN103586564B CN103586564B CN201310516396.0A CN201310516396A CN103586564B CN 103586564 B CN103586564 B CN 103586564B CN 201310516396 A CN201310516396 A CN 201310516396A CN 103586564 B CN103586564 B CN 103586564B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
- B23K9/1006—Power supply
- B23K9/1043—Power supply characterised by the electric circuit
- B23K9/1056—Power supply characterised by the electric circuit by using digital means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/095—Monitoring or automatic control of welding parameters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
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Abstract
The invention discloses a kind of Pulse MIG Welding Power Source system based on STM32, comprise inverter main circuit and control circuit.Described inverter main circuit comprises the input rectifying filtration module, high-frequency inversion module, power voltage changing module and the output rectification filter module that are electrically connected successively; Described control circuit comprises STM32 Digital Control module, measure voltage & current module, failure protection module, human-computer interface module and high-frequency drive module; It is given that human-computer interface module adopts digital pulse coding device to realize welding parameter.The present invention uses STM32 chip controls Pulse MIG Welding Power Source system, and system architecture is simple, and controlling functions is mainly through software simulating, antijamming capability is strong, solving traditional pulse MIG, to weld power system structure complicated, bulky, the given problem such as precise and stable not of parameter.
Description
Technical field
The present invention relates to a kind of Pulse MIG Welding Power Source system based on STM32.
Background technology
Pulse MIC welding technology is comparatively used for high performance automatic welding occasion, it integrates high-efficiency high-quality and automation, its outstanding process characteristic is: zone of welding current is wider, namely pulse MIC welding can obtain spray transfer under average current is less than the condition of critical electric current value, comprises all galvanic areas of short circuiting transfer to spray transfer; Molten bath volume is little, and the heating of droplet transfer and molten pool metal is intermittent, not easily drops down stream, can complete horizontal position welding, vertical position welding smoothly, be conducive to realizing all position welding; Droplet transfer process control is stronger, both can obtain larger fusion penetration (because pulse current amplitude is large), can control again total average welding current in lower level, effectively can control heat input.
Being growing more intense in recent years along with market competition, improve welding productivity, ensure product quality, realize the automation of welding production, the intelligent attention more and more obtaining welding production enterprise, particularly during robot welding welding quality and the higher occasion of required precision all the more so.Add incorporating of the new and high technologies such as modern artificial intelligence technology, digital information treatment technology, computer vision technique, also impel pulse MIC welding technology just towards welding high-speed and high-efficiency, welding digital control, the development of control system intelligent direction.
Existing pulse MIC welding technology mainly contains the shortcoming of the following aspects:
(1) complex structure.It is adopt analog control system to realize controlling that traditional pulse MIG welds power supply, and component number is many, complex structure, bulky.
(2) underaction is controlled, accurately.Traditional analog control system carries out the limited in one's ability of complex process, and component number is many, and the parameter of control system is determined by the parameter of the discrete component such as resistance, electric capacity, and control system debugging is complicated, very flexible; The parameter distribution of resistance, electric capacity affects the uniformity of control system, the poor stability of parameter, as the stability of temperature drift effects control system simultaneously.
Summary of the invention
Technical problem to be solved by this invention, is just to provide a kind of Pulse MIG Welding Power Source system based on STM32, its component number is few, structure is simple, volume is little, controls to debug simple and flexible and parameter accurate stable is good.
Solve the problems of the technologies described above, the present invention adopts following technical scheme:
Based on a Pulse MIG Welding Power Source system of STM32, comprise inverter main circuit and control circuit; Described inverter main circuit comprises the input rectifying filtration module, high-frequency inversion module, power voltage changing module and the output rectification filter module that are electrically connected successively; Input and the three-phase alternating current of input rectifying filtration module input that electrical network is connected, the output of output rectification filter module is connected with arc load;
Described control circuit comprises STM32 Digital Control module, measure voltage & current module, failure protection module, human-computer interface module and high-frequency drive module; Measure voltage & current module inputs arc load, exports STM32 Digital Control module to; failure protection module input three-phase alternating current, export STM32 Digital Control module to, STM32 Digital Control module except with the interconnected communication of human-computer interface module except also through high-frequency drive model calling tremendously high frequency inversion module.
Described STM32 Digital Control module is for adopting control chip STM32F103ZET6, the feedback voltage current parameters of arc load is detected and the given voltage and current parameter of human-computer interface module carries out PI computing according to measure voltage & current module, issue the phase-shift PWM module control signal that STM32 is embedded, phase-shift PWM module produces four tunnel phase-shift PWM signals, and switching tube IGBT the turning on and off under no-voltage going to control high-frequency inversion module is amplified by high-frequency drive module, carry out Pulse MIG Welding Power Source and export pulse current and Control of Voltage; Described human-computer interface module adopts digital pulse coding device to realize the accurately given of welding parameter, and human-computer interface module shows welding parameter in real time.
Described failure protection module comprises interconnective over-voltage detection circuit, undervoltage detection circuit, over-current detection circuit and excess temperature testing circuit, AND circuit and peripheral circuit.
Described PWM drive singal strengthens driving force by high-frequency drive module.
1., for an inverter main circuit for the Pulse MIG Welding Power Source system based on STM32, described inverter main circuit specifically comprises input rectifying bridge (BR1) and output rectifier and filter;
Described input rectifying bridge (BR1) comprising: first to fourth IGBT switching tube (VT1 ~ VT4), with parasitic diode and parasitic capacitance (C9 ~ C12) on each switching tube, first is connected successively respectively with the 4th switching tube (VT2 with VT4) with the 3rd switching tube (VT1 with VT3), second after parallel connection again, the first electric capacity and the 3rd electric capacity (C1 and C3), the second electric capacity and the 4th electric capacity (C2 and C4) is separately had to connect after parallel connection respectively again, the forward of input rectifying bridge (BR1) exports after inductance (L1), is added in one end of the first electric capacity (C1) positive pole and the 3rd electric capacity (C3), oppositely exports one end of the second electric capacity (C2) negative pole and the 4th electric capacity (C4) to, output between first switching tube and the 3rd switching tube (VT1 and VT3) or the 5th electric capacity capacitance (C5) inputted through parallel connection, again through last tremendously high frequency isolating transformer (T1) input of the second inductance resonant inductance (L2) after 6th electric capacity capacitance (C6), output between second switch pipe and the 4th switching tube (VT2 and VT4) or input to another input of high-frequency isolation transformer (T1), first and the 3rd the brachium pontis that forms of switching tube (VT1 and VT3) be leading-bridge, second and the 4th the brachium pontis that forms of switching tube (VT2 and VT4) be lagging leg, 2 IGBT switching tubes of each brachium pontis become 180 ° of complementary conductings, the angle of flow between two brachium pontis differs a phase place,
Described output rectifier and filter comprises: the 5th diode and the 6th diode (V5 and V6), 7th diode and the 8th diode (V7 and V8) are in parallel respectively, 5th diode in parallel and the positive pole of the 6th diode (V5 and V6) connect an output of high-frequency isolation transformer (T1), 7th diode in parallel and the positive pole of the 8th diode (V7 and V8) connect another output of high-frequency isolation transformer (T1), 5th diode in parallel and the 6th diode (V5 and V6) are also parallel with the first absorption resistance and the 7th electric capacity (C7), first absorption resistance is the 5th resistance in parallel and the 6th resistance (R5 and R6), equally, the 7th diode in parallel and the 8th diode (V7 and V8) are also parallel with the second absorption resistance and the 8th electric capacity (C8), the second absorption resistance is the 7th resistance in parallel and the 8th resistance (R7 and R8), 5th diode to the negative pole of the 8th diode (V5 ~ V8) is one end of output after the 3rd inductance (L3), the other end of output is the centre tap of high-frequency isolation transformer (T1).
Operation principle of the present invention:
The present invention adopts full-bridge phase-shift soft switch main circuit, interrupted by digital PI control algolithm and timer period, realize exporting pulse current and Control of Voltage: three-phase main-frequency alternating current enters high-frequency inversion module become smooth direct current electricity after input rectifying filtration module after, then enters arc load by power voltage changing module, output rectification filter module, meanwhile, after STM32 Digital Control module carries out PI computing according to the feedback voltage current parameters of measure voltage & current module detection arc load and the given voltage and current parameter of human-computer interface module, issue STM32 embedded phase-shift PWM module control signal, phase-shift PWM module is made to produce four tunnel phase-shift PWM signals, and switching tube IGBT the turning on and off under no-voltage going to control high-frequency inversion module is amplified by high-frequency drive module, and obtain 20kHz high-frequency high-voltage, high-frequency high-voltage converts through overpower voltage changing module the low-voltage and high-current meeting welding process requirement to again and exports, level and smooth welding current is received again through output rectification filter module, by this current impulse of process implementation source of welding current and Control of Voltage,
The overvoltage of failure protection module, under-voltage, overcurrent and excess temperature testing circuit detect three-phase main-frequency voltage, primary current and radiator temperature; failure protection module is given the voltage x current detected and temperature signal; as there is the phenomenon of overvoltage, under-voltage, overcurrent and excess temperature; failure protection module will give STM32 Digital Control module a low level fault guard signal; STM32 Digital Control module produces the switching tube of low level PWM by high-frequency drive module shuts down high-frequency inversion module, protection main circuit trouble free service.
Compared with prior art, tool has the following advantages and beneficial effect in the present invention:
1. the present invention adopts STM32 chip to realize the Digital Control of Pulse MIG Welding Power Source, and structure is simple, and system is flexible.
2. the present invention adopts pulse coder to realize the accurately given of welding parameter, overcomes traditional potentiometer and realizes the problems such as the given welding process not accurately the caused instability of parameter.
3. the present invention adopts soft-switching inversion technology, achieves FR Sofe Switch, greatly reduces switching loss and the electric stress of power tube, improves condition of work, reduce electromagnetic interference, improve overall efficiency.
Accompanying drawing explanation
Fig. 1 is overall structure block diagram of the present invention;
Fig. 2 is the circuit theory diagrams of inverter main circuit of the present invention;
Fig. 3 is the circuit theory diagrams of high-frequency drive module of the present invention;
Fig. 4 a is the voltage detecting circuit schematic diagram of measure voltage & current module of the present invention;
Fig. 4 b is the current detection circuit schematic diagram of measure voltage & current module of the present invention;
Fig. 5 is the circuit theory diagrams of failure protection module of the present invention;
Fig. 6 is the structural representation of STM32 Digital Control module of the present invention;
Fig. 7 is the Pulse Electric flow graph of power-supply system of the present invention;
Fig. 8 is the program flow diagram of the control system based on STM32 of the present invention.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail.
As shown in Figure 1, the Pulse MIG Welding Power Source system embodiment based on STM32 of the present invention, comprises inverter main circuit and control circuit.
Inverter main circuit comprises the input rectifying filtration module, high-frequency inversion module, power voltage changing module and the output rectification filter module that are electrically connected successively; Input and the three-phase alternating current of input rectifying filtration module input that electrical network is connected, the output of output rectification filter module is connected with arc load.
Control circuit comprises STM32 Digital Control module, measure voltage & current module, failure protection module, human-computer interface module and high-frequency drive module; Measure voltage & current module inputs arc load, exports STM32 Digital Control module to; failure protection module input three-phase alternating current input voltage is conventional voltage check device, exports STM32 Digital Control module to, STM32 Digital Control module except with the interconnected communication of human-computer interface module except also through high-frequency drive model calling tremendously high frequency inversion module.
STM32 Digital Control module adopts control chip STM32F103ZET6, detect after the feedback voltage current parameters of arc load and the given voltage and current parameter of human-computer interface module carry out PI computing according to measure voltage & current module, issue STM32 embedded phase-shift PWM module control signal, phase-shift PWM module is made to produce four tunnel phase-shift PWM signals, and switching tube IGBT the turning on and off under no-voltage going to control high-frequency inversion module is amplified by high-frequency drive module, realize Sofe Switch, realize MIG and weld the control that power supply exports pulse current and voltage, described human-computer interface module adopts digital pulse coding device to realize the accurately given of welding parameter, and human-computer interface module shows welding parameter in real time.
Failure protection module comprises interconnective over-voltage detection circuit, undervoltage detection circuit, over-current detection circuit and excess temperature testing circuit, AND circuit and peripheral circuit.Failure protection module detects three-phase alternating current input voltage, is conventional voltage check device; Detecting excess temperature signal, is conventional temperature relay; Detection of primary over-current signal is conventional Hall current sensor.PWM drive singal strengthens driving force by high-frequency drive module.
Fig. 2 is the circuit theory diagrams of inverter main circuit of the present invention.Inverter main circuit adopts full-bridge phase-shifted soft switch converter, and its topological structure is made up of input rectifying filter circuit, full bridge inverter, high-frequency isolation transformer, output rectifier and filter; Wherein BR1 is input rectifying bridge, and VT1 ~ VT4 is 4 IGBT switching tubes, and with parasitic diode and parasitic capacitance on each switching tube, L2 is resonant inductance, and C5, C6 are capacitances, and V5 ~ V8 is for exporting commutation diode, and inductance L 3 forms output filter circuit.The brachium pontis of VT1 and VT3 composition is leading-bridge, the brachium pontis of VT2 and VT4 composition is lagging leg, 2 IGBT switching tubes of each brachium pontis become 180 ° of complementary conductings, the angle of flow between two brachium pontis differs a phase place, i.e. phase shifting angle, by regulating this phase shifting angle just can regulation output voltage and current.In high-frequency converter loop, the stray inductance of the parasitic capacitance of master power switch pipe and isolating transformer, leakage inductance and resonant inductance etc. constitute a LC resonant tank, no-voltage resonant commutation is realized in device for power switching switching process, it is made to be operated in Sofe Switch state, switching loss is low, and the electromagnetic stress of device significantly reduces.
For an inverter main circuit for the Pulse MIG Welding Power Source system based on STM32, described inverter main circuit specifically comprises input rectifying bridge (BR1) and output rectifier and filter;
Described input rectifying bridge (BR1) comprising: first to fourth IGBT switching tube (VT1 ~ VT4), with parasitic diode and parasitic capacitance (C9 ~ C12) on each switching tube, first is connected successively respectively with the 4th switching tube (VT2 with VT4) with the 3rd switching tube (VT1 with VT3), second after parallel connection again, the first electric capacity and the 3rd electric capacity (C1 and C3), the second electric capacity and the 4th electric capacity (C2 and C4) is separately had to connect after parallel connection respectively again, the forward of input rectifying bridge (BR1) exports after inductance (L1), is added in one end of the first electric capacity (C1) positive pole and the 3rd electric capacity (C3), oppositely exports one end of the second electric capacity (C2) negative pole and the 4th electric capacity (C4) to, output between first switching tube and the 3rd switching tube (VT1 and VT3) or the 5th electric capacity capacitance (C5) inputted through parallel connection, again through last tremendously high frequency isolating transformer (T1) input of the second inductance resonant inductance (L2) after 6th electric capacity capacitance (C6), output between second switch pipe and the 4th switching tube (VT2 and VT4) or input to another input of high-frequency isolation transformer (T1), first and the 3rd the brachium pontis that forms of switching tube (VT1 and VT3) be leading-bridge, second and the 4th the brachium pontis that forms of switching tube (VT2 and VT4) be lagging leg, 2 IGBT switching tubes of each brachium pontis become 180 ° of complementary conductings, the angle of flow between two brachium pontis differs a phase place,
Described output rectifier and filter comprises: the 5th diode and the 6th diode (V5 and V6), 7th diode and the 8th diode (V7 and V8) are in parallel respectively, 5th diode in parallel and the positive pole of the 6th diode (V5 and V6) connect an output of high-frequency isolation transformer (T1), 7th diode in parallel and the positive pole of the 8th diode (V7 and V8) connect another output of high-frequency isolation transformer (T1), 5th diode in parallel and the 6th diode (V5 and V6) are also parallel with the first absorption resistance and the 7th electric capacity (C7), first absorption resistance is the 5th resistance in parallel and the 6th resistance (R5 and R6), equally, 7th diode in parallel and the 8th diode (V7 and V8) are also parallel with the second absorption resistance and the 8th electric capacity (C8), second absorption resistance is the 7th resistance in parallel and the 8th resistance (R7 and R8), export rectification the 5th diode to the 8th diode (V5 ~ V8) negative pole through the 3rd inductance (L3) be output one end, output the other end be the centre tap of high-frequency isolation transformer (T1).
The circuit theory diagrams of high-frequency drive module of the present invention as shown in Figure 3.The supply voltage of STM32 chip is 3.3V, its high speed pwm signal exported also only has 3.3V, it is not enough to the break-make driving high power device IGBT, therefore need the driving force strengthening this pwm signal, the four tunnel phase-shift PWM signals produced by STM32 are as shown in Figure 3 through high-frequency drive module, produce four tunnel push-pull type pulsed drive, respectively as the drive singal of converter bridge switching parts pipe VT1 ~ VT4, gauge tap pipe break-make.
The voltage detecting circuit schematic diagram of measure voltage & current module of the present invention and the current detection circuit schematic diagram of measure voltage & current module of the present invention as shown in figures 4 a and 4b respectively.
Voltage sampling signal is after inductance L 5, L6 and electric capacity C47, C48 filtering, adopt the sampling of non-isolated resistance R47, R48 dividing potential drop, signal condition is carried out afterwards through operational amplifier U16B, carry out isolating, adjusting through precision photoelectric coupler chip U18, voltage follower U17B again, become the voltage signal linear with output voltage, the voltage signal being less than or equal to 3.3V obtained is input to the ADCIN0 of STM32 Digital Control module respectively, then realizes voltage A/D by corresponding software and change.Current sampling circuit utilizes Hall current sensor to carry out current signal sampling to the output current of main circuit, Hall current sensor obtains the weak voltage signals linear with output current and obtains comparatively clean, level and smooth signal afterwards after filtering, then respectively current feedback signal is input to the ADCIN1 of STM32 Digital Control module, then realizes electric current A/D by corresponding software and change.The feedback of voltage and current closed control circuit that above-mentioned link is formed, just can realize the control exporting pulse current and voltage.
Fig. 5 is fault secure circuit schematic diagram of the present invention.Three-phase alternating current is inputted electrical network after Industrial Frequency Transformer step-down by overvoltage and undervoltage detection circuit; resistor voltage divider circuit is supplied after being rectified into d. c. voltage signal with bridge rectifier; regulate the size of bridge circuit resistance R39, R26 and R38, R24 respectively; just can change electrical network overvoltage and under-voltage threshold values, overvoltage and under-voltage protection effect can be played.Excess temperature testing circuit realizes overheat protector by the disconnection detecting the temperature relay on radiator, obtain CN1 1. 2. cut-off signal is to the inverting input of comparator U6A, U6A carries out voltage compare as comparator.Its in-phase end is given reference voltage, and when the temperature of radiator is lower than temperature relay threshold temperature, temperature relay closes, and comparator U6A inverting input is low level, and comparator U6A exports high level; When the temperature of radiator is higher than temperature relay threshold temperature, temperature relay disconnects, and comparator U6A inverting input is high level, comparator U6A output low level, and this signal can cause the error protection of STM32 to interrupt.Over-current detection circuit detection of primary current signal gives the inverting input of comparator U6B after filtering; U6B is given reference current as its in-phase input end of comparator; when the primary current detected is greater than given reference current; comparator U6B output low level, this signal can cause the error protection of STM32 to interrupt.Be connected with the external interrupt pin GPIOG9 of STM32 after optocoupler U14 with the output of door U13 in figure; when with door U13 output output overvoltage, under-voltage, cross gentle over-current detection signal there is under-voltage, overvoltage, mistake gentle over current fault time; with door output low level; output low level after U14 optocoupler; the triggering signal of interrupting as the error protection of STM32 is to the external interrupt pin GPIOG9 of STM32; enter error protection interrupt service subroutine, realize error protection.
Fig. 6 is the structural representation of STM32 Digital Control module of the present invention.STM32 Digital Control module adopts the STM32F103ZET6 chip of ST company, and its basic structure comprises pwm signal output module, human-computer interface module, memory module RAM and FLASH, digital I/O mouth and A/D analog input.The analog signal that A/D sampling is come in delivers to the A/D ALT-CH alternate channel of STM32 Digital Control module, STM32 Digital Control module realizes A/D conversion by software algorithm, after the result of A/D conversion and the given parameter of human-computer interface module are carried out PI computing, issue STM32 embedded phase-shift PWM module control signal, make phase-shift PWM module produce four tunnel phase-shift PWM signals, four tunnel phase-shift PWM signals carry out phase shift modulation to main circuit after the isolation of high-frequency drive module is amplified.Have employed timer period herein to interrupt and underflow interruption, after timer period down trigger, in cycle interruption service routine, the original comparison match value counted up is changed to the matching value subtracting counting and need, when underflow down trigger, in underflow interrupt service routine, the original comparison match value subtracting counting is changed to the comparison match value that next cycle counts up needs, realize full-bridge phase-shift soft switch and control; Adopt one-period timer periodically to switch output current set-point, the pulse realizing electric current exports.
It is output Pulse Electric flow graph of the present invention shown in Fig. 7.Export pulse current in one-period, have 2 stages: peak point current stage Tp; Background current stage Tb.
It is the program flow diagram of STM32 control system of the present invention shown in Fig. 8.The software of design mainly realizes the reading of A/D transformation result and exports the control of pulse current and voltage, namely realizes that the adjustable pwm pulse of phase shifting angle produces, the duty ratio modulation of driving pulse, stage pulse switch and current constant control stage by stage.The operation principle of control system program is: when also starting welding after system initialization, program enters striking program, it comprises SECO (supply gas, wire feed etc.), wire feed striking at a slow speed, when electric current is greater than certain value, and after extending a period of time, program enters the current pulse circulates stage: in the peak point current stage, when this phases-time then enters the background current stage; In the background current stage, when this phases-time then enters the peak point current stage, so constantly move in circles, realize the control exporting pulse current and voltage.Calculate each phases-time when each stage starts by algorithm, adopt unified timer to carry out timing to each stage, and carry out the current constant control of output current in each stage by set-point.In pulse cycle process, constantly check welding stop signal, stop weldering instruction once receive, program enters receipts arc and controls the stage, finally stops the welding arc welding gun switch signal that also circular wait is new.
Claims (1)
1. for an inverter main circuit for the Pulse MIG Welding Power Source system based on STM32, it is characterized in that: described inverter main circuit specifically comprises input rectifying bridge (BR1) and output rectifier and filter;
Described input rectifying bridge (BR1) comprising: first to fourth IGBT switching tube (VT1 ~ VT4), with parasitic diode and parasitic capacitance (C9 ~ C12) on each IGBT switching tube, first is connected successively respectively with the 4th IGBT switching tube (VT2 with VT4) with the 3rd IGBT switching tube (VT1 with VT3), second after parallel connection again, the first electric capacity and the 3rd electric capacity (C1 and C3), the second electric capacity and the 4th electric capacity (C2 and C4) is separately had to connect after parallel connection respectively again, the forward of input rectifying bridge (BR1) exports after inductance (L1), is added in one end of the first electric capacity (C1) positive pole and the 3rd electric capacity (C3), oppositely exports one end of the second electric capacity (C2) negative pole and the 4th electric capacity (C4) to, output between one IGBT switching tube and the 3rd IGBT switching tube (VT1 and VT3) or the 5th electric capacity capacitance (C5) inputted through parallel connection, again through last tremendously high frequency isolating transformer (T1) input of the second inductance resonant inductance (L2) after 6th electric capacity capacitance (C6), output between 2nd IGBT switching tube and the 4th IGBT switching tube (VT2 and VT4) or input to another input of high-frequency isolation transformer (T1), first and the 3rd the brachium pontis that forms of IGBT switching tube (VT1 and VT3) be leading-bridge, second and the 4th the brachium pontis that forms of IGBT switching tube (VT2 and VT4) be lagging leg, 2 IGBT switching tubes of each brachium pontis become 180 ° of complementary conductings, the angle of flow between two brachium pontis differs a phase place,
Described output rectifier and filter comprises: the 5th diode and the 6th diode (V5 and V6), 7th diode and the 8th diode (V7 and V8) are in parallel respectively, 5th diode in parallel and the positive pole of the 6th diode (V5 and V6) connect an output of high-frequency isolation transformer (T1), 7th diode in parallel and the positive pole of the 8th diode (V7 and V8) connect another output of high-frequency isolation transformer (T1), 5th diode in parallel and the 6th diode (V5 and V6) are also parallel with the first absorption resistance and the 7th electric capacity (C7), first absorption resistance is the 5th resistance in parallel and the 6th resistance (R5 and R6), equally, the 7th diode in parallel and the 8th diode (V7 and V8) are also parallel with the second absorption resistance and the 8th electric capacity (C8), the second absorption resistance is the 7th resistance in parallel and the 8th resistance (R7 and R8), 5th diode to the negative pole of the 8th diode (V5 ~ V8) is one end of output after the 3rd inductance (L3), the other end of output is the centre tap of high-frequency isolation transformer (T1).
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Address after: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Patentee after: ELECTRIC POWER RESEARCH INSTITUTE, GUANGDONG POWER GRID CO., LTD. Patentee after: South China University of Technology Address before: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Patentee before: Electrical Power Research Institute of Guangdong Power Grid Corporation Patentee before: South China University of Technology |