CN202550893U - Single-ended forward parallel push-pull type large-power converter - Google Patents

Single-ended forward parallel push-pull type large-power converter Download PDF

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Publication number
CN202550893U
CN202550893U CN2012201120577U CN201220112057U CN202550893U CN 202550893 U CN202550893 U CN 202550893U CN 2012201120577 U CN2012201120577 U CN 2012201120577U CN 201220112057 U CN201220112057 U CN 201220112057U CN 202550893 U CN202550893 U CN 202550893U
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resistance
circuit
capacitor
link
push
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Chinese (zh)
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屈稳太
郭静
董凤莲
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Ningbo Institute of Technology of ZJU
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Ningbo Institute of Technology of ZJU
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Abstract

The utility model discloses a single-ended forward parallel push-pull type large-power converter, which mainly comprises a main circuit, a control power supply, a voltage regulation circuit, a push-pull type PWM waveform generation circuit, a pulse amplification circuit, a feedback circuit and the like. The main circuit is composed of a power frequency rectifying and filtering circuit, a push-pull type high-frequency inverter circuit, a high-frequency rectifying and filtering circuit and the like, which are sequentially and serially connected. The high-frequency inverter part of the single-ended forward parallel push-pull type large-power converter is provided with two single-ended forward transformers, wherein the magnetic circuits of the two transformers are completely independent from each other and the electric circuits of the two transformers are connected in parallel with each other. The two transformers are operated in a push-pull mode, thus are large in output power and reliable in operation. Meanwhile, when the positive and negative half-waves of the magnetic circuit of an ordinary push-pull power converter are asymmetric, DC magnetic biasing risks are avoided. In addition, the straight-through phenomenon of the bridge arm of a bridge circuit during operation can be avoided. A photoelectric coupler and a pulse transformer are not adopted by a power tube drive circuit, so that the circuit is simple and reliable in structure, small in volume and light in weight. The single-ended forward parallel push-pull type large-power converter can be widely applied to low-voltage and large-current occasions.

Description

The high-power converter of a kind of single-end ortho-exciting parallel pushpull formula
Technical field
The utility model relates to a kind of resistance welder, relates in particular to a kind of low-voltage, high-current power inverter of high power density.
Background technology
In resistance welder, mostly need the adjustable DC power supply of low-voltage and high-current, and traditional resistance welder power supply adopts the Industrial Frequency Transformer step-down; Volume is big, Heavy Weight, and dynamic response is slow; Control precision is not high, especially when some field works, brings very big inconvenience to the operator.Therefore modern resistance welding machine electric power mostly adopts the high-power high-frequency inverter, yet traditional high-power high-frequency inverter mainly adopts two kinds of circuit modes, and a kind of is bridge inverter main circuit, owing to there is the risk of bridge arm direct pass, failure rate is high; Another kind then is common push-pull circuit, owing to there is the magnetic circuit coupling, requires main transformer and control circuit in the strict symmetry of positive and negative half-wave; Manufacturing process is complicated; Cost is high, and main switch will bear the DC power supply voltage of twice when turn-offing simultaneously, and switching tube stress is big.
Summary of the invention
The purpose of the utility model is the deficiency to prior art, provides a kind of single-end ortho-exciting parallel pushpull formula high-power converter.
The purpose of the utility model realizes through following technical scheme: a kind of single-end ortho-exciting parallel pushpull formula converter, and it mainly is made up of main circuit, control power supply, voltage regulator circuit, push-pull type PWM Waveform generating circuit, pulse amplifying circuit and feedback circuit etc.; Said main circuit is composed in series by industrial frequency rectifying and filter circuit, push-pull type high-frequency inverter circuit, high-frequency rectification and filter circuit etc. successively; Voltage regulator circuit, push-pull type PWM Waveform generating circuit, pulse amplifying circuit and push-pull type high-frequency inverter circuit link to each other successively, and high-frequency rectification links to each other with voltage regulator circuit through feedback circuit with filter circuit; The control power supply links to each other with pulse amplifying circuit with voltage regulator circuit, push-pull type PWM Waveform generating circuit respectively, to voltage regulator circuit, push-pull type PWM Waveform generating circuit and pulse amplifying circuit power supply.
Further, said push-pull type high-frequency inverter circuit comprises: two transformer T 1And T 2, two insulated gate bipolar triode (Insulation Gate Bipolar Transistor, IGBT) Q 1And Q 2, two resistance R 1And R 2, two capacitor C 2And C 3, two diode D 3And D 4The cathode output end A of industrial frequency rectifying and filter circuit respectively with transformer T 1And T 2The first winding N 1End of the same name, diode D 3And D 4Negative electrode link to each other, the cathode output end B of industrial frequency rectifying and filter circuit respectively with transformer T 1And T 2Tertiary winding N 3End of the same name, insulated gate bipolar triode Q 1And Q 2Emitter, resistance R 1And R 2An end link to each other transformer T 1The first winding N 1Non-same polarity respectively with insulated gate bipolar triode Q 1Collector electrode and capacitor C 2An end link to each other capacitor C 2The other end and resistance R 1The other end link to each other; Transformer T 2The first winding N 1Non-same polarity respectively with insulated gate bipolar triode Q 2Collector electrode and capacitor C 3An end link to each other capacitor C 3The other end and resistance R 2The other end link to each other.
Further,, said high-frequency rectification and filter circuit comprise: two diode D 1And D 2, inductance L 1And capacitor C 4Diode D 1Anode meet the transformer T of push-pull type high-frequency inverter circuit 1The second winding N 2End of the same name, diode D 2Anode meet the transformer T of push-pull type high-frequency inverter circuit 2The second winding N 2End of the same name, diode D 1Negative electrode and diode D 2Negative electrode all and inductance L 1An end link to each other inductance L 1The other end and capacitor C 4An end link to each other, the joint is as the positive pole of output; Transformer T 1And T 2The second winding N 2Non-same polarity all and capacitor C 4The other end link to each other, the joint is as the negative pole of output.
Further,, said push-pull type PWM Waveform generating circuit comprises: integrated circuit U 3, three resistance R 3-R 5, two capacitor C 4, C 5Integrated circuit U 3First pin connect the output of voltage regulator circuit, integrated circuit U 3Crus secunda link to each other integrated circuit U with tripod 3The 4th pin respectively with resistance R 4, resistance R 5And capacitor C 5An end link to each other resistance R 4The ground end of another termination control power supply, resistance R 5And capacitor C 5All receive the control power supply+15V end.Integrated circuit U 3The 5th pin and capacitor C 4An end link to each other capacitor C 4Other end ground connection, integrated circuit U 3The 6th pin and resistance R 3An end link to each other resistance R 3The ground end of another termination control power supply; Integrated circuit U 3The 7th pin and the 16 pin all connect the ground end of control power supply; Integrated circuit U 3The tenth tripod, the 14 pin link to each other with the 15 pin; Integrated circuit U 3Octal, the 11 pin and the 12 pin all receive the control power supply+15V end; Integrated circuit U 3The 9th pin and the tenth pin as the two-way output of push-pull type PWM Waveform generating circuit.
Further, said pulse amplifying circuit comprises two emitter followers, and these two emitter followers connect the two-way output of push-pull type PWM Waveform generating circuit respectively, and one of them emitter follower comprises triode VT 1, two each and every one resistance R 6And R 7, a diode D 5, two voltage-stabiliser tube DW 1And DW 2One tunnel output and triode VT of push-pull type PWM Waveform generating circuit 1Base stage link to each other triode VT 1Collector electrode receive the control power supply+15V end, triode VT 1Emitter respectively with resistance R 6An end, resistance R 7An end and diode D 5Positive pole link to each other resistance R 6The ground end of another termination control power supply, resistance R 7The other end and diode D 5Negative pole all with voltage-stabiliser tube DW 1Negative pole link to each other, the junction is as insulated gate bipolar triode Q 1Gate drive signal, voltage-stabiliser tube DW 1Positive pole and voltage-stabiliser tube DW 2Positive pole link to each other voltage-stabiliser tube DW 2Negative pole receive insulated gate bipolar triode Q 1Emitter.
Further, said voltage feedback circuit comprises resistance R 15And resistance R 16Resistance R 15One terminate to main circuit output cathode, resistance R 15The other end and resistance R 16An end join resistance R 16The other end receive main circuit output negative pole, resistance R 15And resistance R 16The junction as voltage feedback signal U f
Further, said voltage regulator circuit comprises operational amplifier U 4, five resistance R 10-R 14, two capacitor C 6And C 7, two diode D 7And D 8, two potentiometer RP 1And RP 2Said external analog voltages instruction U gConnecting resistance R 10An end, resistance R 10Another termination operational amplifier U 4Negative input end, voltage feedback signal U fConnecting resistance R 11An end, resistance R 11The other end respectively with resistance R 12And capacitor C 6Link to each other resistance R 12The other end and operational amplifier U 4Positive input terminal link to each other capacitor C 6Other end ground connection, resistance R 11, resistance R 12, capacitor C 6Constitute a T mode filter, to voltage feedback signal U fCarry out filtering; Operational amplifier U 4Output and capacitor C 7And resistance R 13Continuous, capacitor C 7The other end and resistance R 14An end link to each other resistance R 14The other end and resistance R 13The other end all be connected to operational amplifier U 4Negative input end, thereby constitute a pi regulator; Operational amplifier U 4Output terminating diode D 7Negative pole, diode D 7Positive pole receive potentiometer RP 1Intermediate point, potentiometer RP 1Termination control power supply+15V end, potentiometer RP 1The ground end of another termination control power supply, form minimum amplitude limit, operational amplifier U to output voltage 4Output receive diode D 8Positive pole, diode D 8Negative pole receive potentiometer RP 2Intermediate point, potentiometer RP 2One terminate to control power supply+15V end, potentiometer RP 2The other end receive the ground end of control power supply, form maximum amplitude limit to output voltage.
The beneficial effect of the utility model is:
1, the high-power converter of this single-end ortho-exciting parallel pushpull formula is compared with traditional half-bridge converter or full-bridge converter, and advantage is not exist the straight-through problem of two switching tubes, so Dead Time need not be set, has improved circuit reliability greatly.
2, the high-power converter of this single-end ortho-exciting parallel pushpull formula is compared with traditional half-bridge converter or full-bridge converter, and advantage is two main switches altogether, can save isolating devices such as photoelectrical coupler or pulse transformer, makes circuit simple and reliable.
3, the high-power converter of this single-end ortho-exciting parallel pushpull formula is compared with traditional push-pull converter; Its advantage is that two main transformer magnetic circuits are independent, when design transformer and control circuit, do not need the strict symmetry of positive and negative half-wave, and traditional push-pull converter requires the necessary strict symmetry of positive and negative half-wave; Otherwise; Dc magnetization will appear in transformer, forms magnetic bias, causes inverter failure.
4, the high-power converter of this single-end ortho-exciting parallel pushpull formula is compared with traditional push-pull converter, and its advantage is main switch Q 1Or Q 2Only bear 1.5 times supply voltage, reduced requirement of withstand voltage main switch; And traditional push-pull converter circuit main switch Q 1Or Q 2Will bear 2 times supply voltage during shutoff, voltage stress is big.
Description of drawings
Fig. 1 is the composition frame chart of the high-power converter of single-end ortho-exciting parallel pushpull formula;
Fig. 2 is industrial frequency rectifying and filter circuit figure;
Fig. 3 is the circuit diagram of push-pull type high-frequency inverter circuit and high-frequency rectification and filter circuit;
Fig. 4 is the circuit diagram of push-pull type PWM Waveform generating circuit and pulse amplifying circuit;
Fig. 5 is the circuit diagram of feedback circuit and voltage regulator circuit;
Fig. 6 is the main transformer structure chart;
Fig. 7 is system's oscillogram.
Embodiment
As shown in Figure 1; The utility model single-end ortho-exciting parallel pushpull formula converter mainly is made up of main circuit, control power supply, voltage regulator circuit, push-pull type PWM Waveform generating circuit, pulse amplifying circuit and feedback circuit, and main circuit is composed in series by industrial frequency rectifying and filter circuit, push-pull type high-frequency inverter circuit, high-frequency rectification and filter circuit successively; Voltage regulator circuit, push-pull type PWM Waveform generating circuit, pulse amplifying circuit and push-pull type high-frequency inverter circuit link to each other successively, and high-frequency rectification links to each other with voltage regulator circuit through feedback circuit with filter circuit.The control power supply links to each other with pulse amplifying circuit with voltage regulator circuit, push-pull type PWM Waveform generating circuit respectively, to voltage regulator circuit, push-pull type PWM Waveform generating circuit and pulse amplifying circuit power supply.
The alternating current of electrical network input is transformed to direct current through industrial frequency rectifying and filter circuit; Direct current is transformed to the high frequency square wave alternating current through the push-pull type high-frequency inverter circuit; The high frequency square wave alternating current is transformed to direct current through high-frequency rectification and filter circuit again; Supply load, and be delivered to voltage regulator circuit through feedback circuit, as feedback signal.Voltage regulator circuit receives outside instruction simulation voltage; And the feedback signal that instruction simulation voltage and feedback circuit are sent here relatively; Produce control signal; This control signal produces the pwm pulse ripple through push-pull type PWM Waveform generating circuit, and the pwm pulse ripple amplifies back control push-pull type high-frequency inverter circuit through pulse amplifying circuit.
As shown in Figure 2, industrial frequency rectifying and filter circuit comprise two bridge rectifier module U 1And U 2With an electrochemical capacitor C 1Two bridge rectifier module U 1And U 2Ac input end AC 1And AC 2Receive the live wire L and the zero line N of AC network respectively; Two bridge rectifier module U 1And U 2Anodal all with electrochemical capacitor C 1Positive pole link to each other, the joint is as the cathode output end A of industrial frequency rectifying and filter circuit; Two bridge rectifier module U 1And U 2Negative pole all with electrochemical capacitor C 1Negative pole link to each other, the joint is as the cathode output end B of industrial frequency rectifying and filter circuit.
As shown in Figure 3, the push-pull type high-frequency inverter circuit comprises: two transformer T 1And T 2, two insulated gate bipolar triode (Insulation Gate Bipolar Transistor, IGBT) Q 1And Q 2, two resistance R 1And R 2, two capacitor C 2And C 3, two diode D 3And D 4The cathode output end A of industrial frequency rectifying and filter circuit respectively with transformer T 1And T 2The first winding N 1End of the same name, diode D 3And D 4Negative electrode link to each other, the cathode output end B of industrial frequency rectifying and filter circuit respectively with transformer T 1And T 2Tertiary winding N 3End of the same name, insulated gate bipolar triode Q 1And Q 2Emitter, resistance R 1And R 2An end link to each other transformer T 1The first winding N 1Non-same polarity respectively with insulated gate bipolar triode Q 1Collector electrode and capacitor C 2An end link to each other capacitor C 2The other end and resistance R 1The other end link to each other; Transformer T 2The first winding N 1Non-same polarity respectively with insulated gate bipolar triode Q 2Collector electrode and capacitor C 3An end link to each other capacitor C 3The other end and resistance R 2The other end link to each other.
As shown in Figure 3, high-frequency rectification and filter circuit comprise: two diode D 1And D 2, inductance L 1, capacitor C 4Diode D 1Anode meet the transformer T of push-pull type high-frequency inverter circuit 1The second winding N 2End of the same name, diode D 2Anode meet the transformer T of push-pull type high-frequency inverter circuit 2The second winding N 2End of the same name, diode D 1Negative electrode and diode D 2Negative electrode all and inductance L 1An end link to each other inductance L 1The other end and capacitor C 4An end link to each other, the joint is as the positive pole of output; Transformer T 1And T 2The second winding N 2Non-same polarity all and capacitor C 4The other end link to each other, the joint is as the negative pole of output.
As shown in Figure 4, push-pull type PWM Waveform generating circuit comprises: integrated circuit U 3, three resistance R 3-R 5, two capacitor C 4, C 5Resistance R 3And capacitor C 4Determined the carrier frequency of push-pull type PWM waveform; Integrated circuit U 3First pin connect the output of voltage regulator circuit, integrated circuit U 3Crus secunda link to each other integrated circuit U with tripod 3The 4th pin respectively with resistance R 4, resistance R 5And capacitor C 5An end link to each other resistance R 4The ground end of another termination control power supply, resistance R 5And capacitor C 5All receive the control power supply+15V end.Integrated circuit U 3The 5th pin and capacitor C 4An end link to each other capacitor C 4Other end ground connection, integrated circuit U 3The 6th pin and resistance R 3An end link to each other resistance R 3The ground end of another termination control power supply; Integrated circuit U 3The 7th pin and the 16 pin all connect the ground end of control power supply; Integrated circuit U 3The tenth tripod, the 14 pin link to each other with the 15 pin; Integrated circuit U 3Octal, the 11 pin and the 12 pin all receive the control power supply+15V end; Integrated circuit U 3The 9th pin and the tenth pin as the two-way output of push-pull type PWM Waveform generating circuit.
As shown in Figure 4, pulse amplifying circuit comprises two emitter followers, and these two emitter followers connect the two-way output of push-pull type PWM Waveform generating circuit respectively, and one of them emitter follower comprises triode VT 1, two each and every one resistance R 6And R 7, a diode D 5, two voltage-stabiliser tube DW 1And DW 2One tunnel output and triode VT of push-pull type PWM Waveform generating circuit 1Base stage link to each other triode VT 1Collector electrode receive the control power supply+15V end, triode VT 1Emitter respectively with resistance R 6An end, resistance R 7An end and diode D 5Positive pole link to each other resistance R 6The ground end of another termination control power supply, resistance R 7The other end and diode D 5Negative pole all with voltage-stabiliser tube DW 1Negative pole link to each other, the junction is as insulated gate bipolar triode Q 1Gate drive signal, voltage-stabiliser tube DW 1Positive pole and voltage-stabiliser tube DW 2Positive pole link to each other voltage-stabiliser tube DW 2Negative pole receive insulated gate bipolar triode Q 1Emitter, promptly control the ground end of power supply.Likewise, another emitter follower comprises triode VT 2, two resistance R 8And R 9, a diode D 6, two voltage-stabiliser tube DW 3And DW 4Another road output and triode VT of push-pull type PWM Waveform generating circuit 2Base stage link to each other triode VT 2Collector electrode connect the control power supply+15V end, triode VT 2Emitter respectively with resistance R 8An end, resistance R 9An end and diode D 6Positive pole link to each other resistance R 8The other end receive control power supply the ground end, resistance R 9The other end and diode D 6Negative pole all with voltage-stabiliser tube DW 3Negative pole link to each other, the junction is as insulated gate bipolar triode Q 2Gate drive signal, voltage-stabiliser tube DW 3Positive pole and voltage-stabiliser tube DW 4Positive pole link to each other voltage-stabiliser tube DW 4Negative pole receive insulated gate bipolar triode Q 2Emitter, promptly control the ground end of power supply.
As shown in Figure 5, voltage feedback circuit comprises resistance R 15And resistance R 16Resistance R 15One terminate to main circuit output cathode, resistance R 15The other end and resistance R 16An end join resistance R 16The other end receive main circuit output negative pole, resistance R 15And resistance R 16The junction draw as voltage feedback signal U fVoltage regulator circuit comprises operational amplifier U 4, five resistance R 10-R 14, two capacitor C 6And C 7, two diode D 7And D 8, two potentiometer RP 1And RP 2External analog voltages instruction U gConnecting resistance R 10An end, resistance R 10Another termination operational amplifier U 4Negative input end, voltage feedback signal U fConnecting resistance R 11An end, resistance R 11The other end respectively with resistance R 12And capacitor C 6Link to each other resistance R 12The other end and operational amplifier U 4Positive input terminal link to each other capacitor C 6Other end ground connection, resistance R 11, resistance R 12, capacitor C 6Constitute a T mode filter, to voltage feedback signal U fCarry out filtering; Operational amplifier U 4Output and capacitor C 7And resistance R 13Continuous, capacitor C 7The other end and resistance R 14An end link to each other resistance R 14The other end and resistance R 13The other end all be connected to operational amplifier U 4Negative input end, thereby constitute a pi regulator; Operational amplifier U 4Output terminating diode D 7Negative pole, diode D 7Positive pole receive potentiometer RP 1Intermediate point, potentiometer RP 1Termination control power supply+15V end, potentiometer RP 1The ground end of another termination control power supply, form minimum amplitude limit, operational amplifier U to output voltage 4Output receive diode D 8Positive pole, diode D 8Negative pole receive potentiometer RP 2Intermediate point, potentiometer RP 2One terminate to control power supply+15V end, potentiometer RP 2The other end receive the ground end of control power supply, form maximum amplitude limit to output voltage.
The utility model has partly adopted two single-ended forward type transformers fully independently on magnetic circuit at high-frequency inversion; Parallel connection on circuit connects; They work in the symmetrical operation mode, and power output is big, reliable operation; Avoided common danger of recommending the D.C. magnetic biasing that the power inverter magnetic circuit causes when positive and negative half-wave is asymmetric, the danger of bridge arm direct pass when also having overcome simultaneously bridge circuit work.Power tube drive circuit has saved photoelectrical coupler and pulse transformer, and circuit structure is simple, and reliable, volume is little, and is in light weight, needing to be widely used in the occasion of low-voltage and high-current, like various heaters, electric welding machine etc.
The type selecting of the main components and parts of the utility model and the design of main transformer are following:
The utility model be primarily aimed at specified output 48VDC load, its output-current rating is 62A, output voltage adjustable range 0V-48V.Converter overall dimension be 240
Figure 384590DEST_PATH_IMAGE001
200
Figure 183919DEST_PATH_IMAGE002
150, weight is 10kg.
1, transformer T 1And T 2Design
Select ferrite EE55 magnetic core for use, magnetic flux net sectional area Ae=354 mm2, operating frequency f=100kHz, work magnetic flux density △ B=0.3T, dc voltage U Dc=310V, duty ratio D=0.45 is according to balance of voltage equation U Dc=f
Figure 707304DEST_PATH_IMAGE002
N1
Figure 199465DEST_PATH_IMAGE002
Ae
Figure 175511DEST_PATH_IMAGE002
△ B/D calculates first side winding number of turn N 1=14, secondary side winding number of turn N 2=3, magnetic-reset umber of turn N 3=2
Figure 342313DEST_PATH_IMAGE002
N 1=28.Winding N 1Line directly select
Figure 985784DEST_PATH_IMAGE003
2.55mm the line of secondary side winding N2 is directly selected
Figure 383267DEST_PATH_IMAGE003
3.69mm, magnetic-reset winding N 3Line directly select 0.78mm.During coiling, with reference to figure 6, the N1 winding is around nexine, and the N3 winding is around the intermediate layer, and the N2 winding is at skin.
2, voltage regulator design
According to shown in Figure 5, can get:
Figure 253320DEST_PATH_IMAGE004
；
Parameter is selected, resistance R 10=20K
Figure 751297DEST_PATH_IMAGE005
, resistance R 11=resistance R 12=10K
Figure 257365DEST_PATH_IMAGE005
, resistance R 13=1M , resistance R 14=30K
Figure 418405DEST_PATH_IMAGE005
Capacitor C 7=0.0022 μ f, capacitor C 6=0. 47 μ f.
3, other parameters of operating part is selected
In circuit shown in Figure 2, bridge rectifier module U1 and U2 select the bridge rectifier module of 25A/1000V for use, and filter capacitor is selected 4 parallel connections of 470 μ f/450V electrochemical capacitors for use.
In push-pull type inverter main circuit shown in Figure 3, main switch Q 1And Q 2Select the High Speed I GBT of 600V/30A for use, secondary side rectifier diode D 1And D 2Select 200V for use, 2
Figure 331741DEST_PATH_IMAGE002
The fast recovery rectifier diode of 30A.Output inductor L 1=10 μ H/65A, output filter capacitor C 4=1000 μ f/200V, RC absorbs circuit capacitance C 2=C 3=0.022 μ f/630V, resistance R 1=R 2=100/10W, magnetic-reset diode D 3, D 4Elect fast diode MUR8100 as.
Recommend in PWM Waveform generating circuit and the pulse amplifying circuit integrated circuit U shown in Figure 4 3Can select the product TL494 of TI company for use, resistance R 3Select 1.8 K for use, capacitor C 4Select 0.01 μ f for use, resistance R 4 is selected 12K for use
Figure 461240DEST_PATH_IMAGE005
, resistance R 5 is selected 200K for use, and capacitor C 5 is selected 47 μ f/25V electrochemical capacitors, resistance R for use 6, resistance R 8Select 5.1 K for use
Figure 525273DEST_PATH_IMAGE005
, resistance R 7, resistance R 9Select 100 for use, triode VT 1, VT 2Select switching tube 9014 for use, diode D 5, D 6Select 1N4048 for use, voltage-stabiliser tube DW 1, DW 3Select 15V/2W for use, voltage-stabiliser tube DW 2, DW 4Select 5V/2W for use.
The course of work of the high-power converter of the utility model single-end ortho-exciting parallel pushpull formula is following: as shown in Figure 3, and transformer T 1, T 2The first winding N 1Be the primary side main winding, tertiary winding N 3Be the degaussing winding, the number of turn of tertiary winding N3 is the first winding N 12 times of the number of turn, tertiary winding N 3With diode D 3And D 4The effect of magnetic-reset, the second winding N are played in series connection 2Be secondary side winding, capacitor C 2And C 3Respectively with resistance R 2And R 3Be composed in series RC and absorb circuit, play and suppress main switch Q 1And Q 2The instantaneous peak voltage that produces at collector electrode during shutoff.Switching tube Q 1With switching tube Q 2Work in the symmetrical operation mode, two-way driving pulse phase phasic difference 180 o
When being operated in positive half wave, switching tube Q 1Conducting, main transformer T 1The first winding N 1Bear DC power supply voltage, its end of the same name () is being for just, and non-same polarity is for negative, the second winding N 2The induced voltage polarity and the first winding N 1Polarity identical, diode D 1Conducting is transformed to the secondary side low-voltage DC with the primary side high voltage direct current, to load electric energy is provided, simultaneously, and main transformer T 1Tertiary winding N 3Respond to 2 times of supply voltages, diode D 3Bearing 3 times of reverse supply voltages turn-offs; During this period, switching tube Q 2Turn-off main transformer T 2Tertiary winding N 3Induced voltage end of the same name for negative, non-same polarity is being for just, diode in series D 4Therefore conducting produces demagnetizing current, main transformer T 2The first winding N 1With the second winding N 2Induced voltage and tertiary winding N 3Induced voltage polarity identical, make secondary side diode D 2Bearing back-pressure turn-offs; Because the number of turn of tertiary winding N3 is the first winding N 12 times of the number of turn are then at the first winding N 1In induce 0.5 times supply voltage, main switch Q at this moment 2The voltage that collector electrode bore is 1.5 times supply voltage.
When being operated in negative half-wave, switching tube Q 2Conducting, main transformer T 2The first winding N 1Bear DC power supply voltage, its end of the same name (
Figure 70524DEST_PATH_IMAGE008
) for just, non-same polarity is for negative, the second winding N 2The induced voltage polarity and the first winding N 1Polarity identical, diode D 2Conducting is transformed to the secondary side low-voltage DC with the primary side high voltage direct current, to load electric energy is provided, simultaneously, and main transformer T 2Tertiary winding N 3Respond to 2 times of supply voltages, diode D 4Bearing 3 times of reverse supply voltages turn-offs; During this period, switching tube Q 1Turn-off main transformer T 1Tertiary winding N 3Induced voltage end of the same name for negative, non-same polarity is being for just, diode in series D 3Therefore conducting produces demagnetizing current, main transformer T 1The first winding N 1With the second winding N 2Induced voltage and tertiary winding N 3Induced voltage polarity identical, make secondary side diode D 1Bearing back-pressure turn-offs; Because tertiary winding N 3The number of turn be the first winding N 12 times of the number of turn are then at the first winding N 1In induce 0.5 times supply voltage, main switch Q at this moment 1The voltage that collector electrode bore is 1.5 times supply voltage.

Claims (7)

1. a single-end ortho-exciting parallel pushpull formula converter is characterized in that, it mainly is made up of main circuit, control power supply, voltage regulator circuit, push-pull type PWM Waveform generating circuit, pulse amplifying circuit and feedback circuit; Said main circuit is composed in series by industrial frequency rectifying and filter circuit, push-pull type high-frequency inverter circuit, high-frequency rectification and filter circuit successively; Voltage regulator circuit, push-pull type PWM Waveform generating circuit, pulse amplifying circuit and push-pull type high-frequency inverter circuit link to each other successively, and high-frequency rectification links to each other with voltage regulator circuit through feedback circuit with filter circuit; The control power supply links to each other with pulse amplifying circuit with voltage regulator circuit, push-pull type PWM Waveform generating circuit respectively.
2. according to the said single-end ortho-exciting parallel pushpull of claim 1 formula converter, it is characterized in that said push-pull type high-frequency inverter circuit comprises: two transformer T 1And T 2, two insulated gate bipolar triode Q 1And Q 2, two resistance R 1And R 2, two capacitor C 2And C 3, two diode D 3And D 4The cathode output end A of industrial frequency rectifying and filter circuit respectively with transformer T 1And T 2The first winding N 1End of the same name, diode D 3And D 4Negative electrode link to each other, the cathode output end B of industrial frequency rectifying and filter circuit respectively with transformer T 1And T 2Tertiary winding N 3End of the same name, insulated gate bipolar triode Q 1And Q 2Emitter, resistance R 1And R 2An end link to each other transformer T 1The first winding N 1Non-same polarity respectively with insulated gate bipolar triode Q 1Collector electrode and capacitor C 2An end link to each other capacitor C 2The other end and resistance R 1The other end link to each other; Transformer T 2The first winding N 1Non-same polarity respectively with insulated gate bipolar triode Q 2Collector electrode and capacitor C 3An end link to each other capacitor C 3The other end and resistance R 2The other end link to each other.
3. according to the said single-end ortho-exciting parallel pushpull of claim 1 formula converter, it is characterized in that said high-frequency rectification and filter circuit comprise: two diode D 1And D 2, inductance L 1And capacitor C 4Diode D 1Anode meet the transformer T of push-pull type high-frequency inverter circuit 1The second winding N 2End of the same name, diode D 2Anode meet the transformer T of push-pull type high-frequency inverter circuit 2The second winding N 2End of the same name, diode D 1Negative electrode and diode D 2Negative electrode all and inductance L 1An end link to each other inductance L 1The other end and capacitor C 4An end link to each other, the joint is as the positive pole of output; Transformer T 1And T 2The second winding N 2Non-same polarity all and capacitor C 4The other end link to each other, the joint is as the negative pole of output.
4. according to the said single-end ortho-exciting parallel pushpull of claim 1 formula converter, it is characterized in that said push-pull type PWM Waveform generating circuit comprises: integrated circuit U 3, three resistance R 3-R 5, two capacitor C 4, C 5Integrated circuit U 3First pin connect the output of voltage regulator circuit, integrated circuit U 3Crus secunda link to each other integrated circuit U with tripod 3The 4th pin respectively with resistance R 4, resistance R 5And capacitor C 5An end link to each other resistance R 4The ground end of another termination control power supply, resistance R 5And capacitor C 5All receive the control power supply+15V end; Integrated circuit U 3The 5th pin and capacitor C 4An end link to each other capacitor C 4Other end ground connection, integrated circuit U 3The 6th pin and resistance R 3An end link to each other resistance R 3The ground end of another termination control power supply; Integrated circuit U 3The 7th pin and the 16 pin all connect the ground end of control power supply; Integrated circuit U 3The tenth tripod, the 14 pin link to each other with the 15 pin; Integrated circuit U 3Octal, the 11 pin and the 12 pin all receive the control power supply+15V end; Integrated circuit U 3The 9th pin and the tenth pin as the two-way output of push-pull type PWM Waveform generating circuit.
5. according to the said single-end ortho-exciting parallel pushpull of claim 1 formula converter; It is characterized in that; Said pulse amplifying circuit comprises two emitter followers, and these two emitter followers connect the two-way output of push-pull type PWM Waveform generating circuit respectively, and one of them emitter follower comprises triode VT 1, two each and every one resistance R 6And R 7, a diode D 5, two voltage-stabiliser tube DW 1And DW 2One tunnel output and triode VT of push-pull type PWM Waveform generating circuit 1Base stage link to each other triode VT 1Collector electrode receive the control power supply+15V end, triode VT 1Emitter respectively with resistance R 6An end, resistance R 7An end and diode D 5Positive pole link to each other resistance R 6The ground end of another termination control power supply, resistance R 7The other end and diode D 5Negative pole all with voltage-stabiliser tube DW 1Negative pole link to each other, the junction is as insulated gate bipolar triode Q 1Gate drive signal, voltage-stabiliser tube DW 1Positive pole and voltage-stabiliser tube DW 2Positive pole link to each other voltage-stabiliser tube DW 2Negative pole receive insulated gate bipolar triode Q 1Emitter.
6. according to the said single-end ortho-exciting parallel pushpull of claim 1 formula converter, it is characterized in that said voltage feedback circuit comprises resistance R 15And resistance R 16Resistance R 15One terminate to main circuit output cathode, resistance R 15The other end and resistance R 16An end join resistance R 16The other end receive main circuit output negative pole, resistance R 15And resistance R 16The junction as voltage feedback signal U f
7. according to the said single-end ortho-exciting parallel pushpull of claim 1 formula converter, it is characterized in that said voltage regulator circuit comprises operational amplifier U 4, five resistance R 10-R 14, two capacitor C 6And C 7, two diode D 7And D 8, two potentiometer RP 1And RP 2Said external analog voltages instruction U gConnecting resistance R 10An end, resistance R 10Another termination operational amplifier U 4Negative input end, voltage feedback signal U fConnecting resistance R 11An end, resistance R 11The other end respectively with resistance R 12And capacitor C 6Link to each other resistance R 12The other end and operational amplifier U 4Positive input terminal link to each other capacitor C 6Other end ground connection, resistance R 11, resistance R 12, capacitor C 6Constitute a T mode filter, to voltage feedback signal U fCarry out filtering; Operational amplifier U 4Output and capacitor C 7And resistance R 13Continuous, capacitor C 7The other end and resistance R 14An end link to each other resistance R 14The other end and resistance R 13The other end all be connected to operational amplifier U 4Negative input end, thereby constitute a pi regulator; Operational amplifier U 4Output terminating diode D 7Negative pole, diode D 7Positive pole receive potentiometer RP 1Intermediate point, potentiometer RP 1Termination control power supply+15V end, potentiometer RP 1The ground end of another termination control power supply, form minimum amplitude limit, operational amplifier U to output voltage 4Output receive diode D 8Positive pole, diode D 8Negative pole receive potentiometer RP 2Intermediate point, potentiometer RP 2One terminate to control power supply+15V end, potentiometer RP 2The other end receive the ground end of control power supply, form maximum amplitude limit to output voltage.
CN2012201120577U 2012-03-23 2012-03-23 Single-ended forward parallel push-pull type large-power converter Expired - Fee Related CN202550893U (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102624246A (en) * 2012-03-23 2012-08-01 浙江大学宁波理工学院 Single-ended forward parallel push-pull type high-power converter
CN104571250A (en) * 2015-02-10 2015-04-29 四川英杰电气股份有限公司 Parallel high-power switching power supply
CN107843890A (en) * 2017-10-31 2018-03-27 海鹰企业集团有限责任公司 Sonar transmission circuit
CN108347175A (en) * 2018-04-23 2018-07-31 顺德职业技术学院 A kind of constant voltage outputting circuit of inverter
CN111476992A (en) * 2020-05-08 2020-07-31 中国北方车辆研究所 Bearing rotating speed signal regulating circuit in electrical equipment

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102624246A (en) * 2012-03-23 2012-08-01 浙江大学宁波理工学院 Single-ended forward parallel push-pull type high-power converter
CN102624246B (en) * 2012-03-23 2014-12-10 浙江大学宁波理工学院 Single-ended forward parallel push-pull type high-power converter
CN104571250A (en) * 2015-02-10 2015-04-29 四川英杰电气股份有限公司 Parallel high-power switching power supply
CN104571250B (en) * 2015-02-10 2016-03-16 四川英杰电气股份有限公司 A kind of parallel great power Switching Power Supply
CN107843890A (en) * 2017-10-31 2018-03-27 海鹰企业集团有限责任公司 Sonar transmission circuit
CN108347175A (en) * 2018-04-23 2018-07-31 顺德职业技术学院 A kind of constant voltage outputting circuit of inverter
CN108347175B (en) * 2018-04-23 2023-10-03 顺德职业技术学院 Constant voltage output circuit of inverter power supply
CN111476992A (en) * 2020-05-08 2020-07-31 中国北方车辆研究所 Bearing rotating speed signal regulating circuit in electrical equipment
CN111476992B (en) * 2020-05-08 2021-06-08 中国北方车辆研究所 Bearing rotating speed signal regulating circuit in electrical equipment

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