CN204810140U - Power factor correction circuit and invertion power supply circuit, contravariant welding machine - Google Patents

Power factor correction circuit and invertion power supply circuit, contravariant welding machine Download PDF

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Publication number
CN204810140U
CN204810140U CN201520541140.XU CN201520541140U CN204810140U CN 204810140 U CN204810140 U CN 204810140U CN 201520541140 U CN201520541140 U CN 201520541140U CN 204810140 U CN204810140 U CN 204810140U
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China
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circuit
output
voltage
power
power transistor
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CN201520541140.XU
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不公告发明人
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Shanghai Hugong Electric Group Co Ltd
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Shanghai Hugong Electric Group Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier

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Abstract

The utility model relates to an invertion power supply circuit is applied to to the power factor correction circuit, and the invertion power supply circuit includes power transistor and drive circuit, the power factor correction circuit includes: current transformer, current transformer's primary winding is connected with power transistor's output, rectifier circuit is connected with current transformer's secondary, voltage sampling circuit, one end is connected with rectifier circuit's output, and the other end and current transformer's secondary is connected, filter circuit sets up with voltage sampling circuit is parallelly connected, voltage follower, voltage follower's input and filter circuit are connected, and control circuit for be connected with drive circuit, thereby and control the switch of control power transistor to drive circuit according to voltage follower's output voltage. Above -mentioned power factor correction circuit can obtain higher power factor and stability is better. The utility model discloses still relate to an invertion power supply circuit and contravariant welding machine.

Description

Circuit of power factor correction and inverter power circuit, inverter type welder
Technical field
The utility model relates to power technique fields, particularly relates to a kind of circuit of power factor correction, also relates to a kind of inverter power circuit and a kind of inverter type welder.
Background technology
Along with the source of welding current develop rapidly and more and more universal, user to the demand of power supply also in continuous growth, require that source of welding current manufacturer can produce more efficiently, the green power supply of more high-quality, to reduce electric energy loss, alleviate network load and pollution, namely require that the source of welding current has higher power factor, described how design power factor correcting (PowerFactorCorrection, PFC) circuit is key technology.Traditional circuit of power factor correction generally adopts shunt to detect boost inductor current.Because the power output of welding machine is all more than multikilowatt, main circuit current is larger, thus makes shunt caloric value comparatively large, large to the power requirement of shunt, thus is unfavorable for the power factor improving power circuit.Further, the conference of shunt caloric value causes the resistance of shunt to fluctuate and causes the deviation of sampled signal, reduces the stability of system.
Utility model content
Based on this, be necessary to provide one to have High Power Factor and the good circuit of power factor correction of stability.
A kind of circuit of power factor correction, be applied in inverter power circuit, described inverter power circuit comprises power transistor and the drive circuit for driving described power transistor to carry out switch; Described circuit of power factor correction comprises: current transformer, and the armature winding of described current transformer is connected with the output of described power transistor; Rectification circuit, is connected with the secondary winding of described current transformer; Voltage sampling circuit, one end is connected with the output of described rectification circuit, and the other end is connected with the secondary winding of described current transformer; Filter circuit, is arranged in parallel with described voltage sampling circuit; Voltage follower, the input of described voltage follower is connected with described filter circuit; And control circuit, be connected with the output of described voltage follower; Described control circuit is used for being connected with described drive circuit, and to control drive circuit according to the output voltage of described voltage follower thus control the switch of power transistor.
Wherein in an embodiment, also comprise current sampling resistor; Described current sampling resistor is parallel to the secondary winding two ends of described current transformer.
Wherein in an embodiment, described rectification circuit comprises rectifier diode; Described voltage sampling circuit comprises voltage sample resistance; The positive pole of described rectifier diode is connected with secondary winding one end of described current transformer, and the negative pole of described rectifier diode is connected with described voltage sample resistance; The other end of the secondary winding of described current transformer is connected with described voltage sample resistance.
Wherein in an embodiment, also comprise the absorbing circuit between input and output being parallel to described power transistor; Described absorbing circuit is for absorbing the peak voltage signal flowing to described power transistor.
Wherein in an embodiment, described absorbing circuit comprises the first resistance, the first electric capacity and the first diode; The positive pole of described first diode is connected with the input of described power transistor, and the negative pole of described first diode is connected with the output of described power transistor; Described first resistor coupled in parallel is in the two ends of described first diode; One end of described first electric capacity is connected with the negative pole of described first diode, and the other end is connected with the output of described power transistor, the armature winding of described current transformer respectively.
Also relate to a kind of inverter power circuit.
A kind of inverter power circuit, comprises boost inductance, power transistor and drive circuit; One end of described booster voltage is connected with power input, and the other end is connected with the input of described power transistor; Described drive circuit is connected with the control end of described power transistor, driving described power transistor to carry out switch, it is characterized in that, also comprise circuit of power factor correction for controlling; Described circuit of power factor correction comprises:
Current transformer, the armature winding of described current transformer is connected with the output of described power transistor;
Rectification circuit, is connected with the secondary winding of described current transformer;
Voltage sampling circuit, one end is connected with the output of described rectification circuit, and the other end is connected with the secondary winding of described current transformer;
Filter circuit, is arranged in parallel with described voltage sampling circuit;
Voltage follower, the input of described voltage follower is connected with described filter circuit; And
Control circuit, is connected with the output of described voltage follower; Described control circuit is used for being connected with described drive circuit, and to control drive circuit according to the output voltage of described voltage follower thus control the switch of power transistor.
Wherein in an embodiment, described circuit of power factor correction also comprises the absorbing circuit between input and output being parallel to described power transistor; Described absorbing circuit is for absorbing the peak voltage signal flowing to described power transistor.
Wherein in an embodiment, also comprise input rectification circuit, inverter circuit and output rectification circuit; One end of described boost inductance is connected with described input rectification circuit; The other end of described boost inductance is connected with described inverter circuit; The output of described inverter circuit is also connected with described output rectification circuit.
Wherein in an embodiment, also comprise constant voltage DC output circuit; The input of described constant voltage DC output circuit is connected with described boost inductance, and the output of described constant voltage DC output circuit is as DC voltage output end.
Also relate to a kind of inverter type welder.
A kind of inverter type welder, comprises the inverter power circuit described in aforementioned any embodiment.
Above-mentioned circuit of power factor correction, inverter power circuit and inverter type welder, carrying out current sample by current transformer can be converted to small area analysis signal by the big current flowing through power transistor.Small area analysis signal is converted to sampled voltage after voltage sampling circuit.Sampled voltage is sent to after voltage follower carries out electric current isolation after processing of circuit after filtering and exports to control circuit, to realize the switch control rule to power transistor, carry out the input current waveform on continuous regulating circuit, make its change of following input voltage waveform and change, and then improving the power factor of input power.Carry out current sample by current transformer, caloric value is lower, can improve the power factor of input power further and improve the stability of circuit.And the electric current isolated controlling between circuit of power factor correction and the main translation circuit of inverter can be realized by voltage follower, further increase the stability of circuit.
Accompanying drawing explanation
Fig. 1 is the circuit theory schematic diagram of the inverter power circuit in an embodiment;
Fig. 2 is the schematic block circuit diagram of the circuit of power factor correction in the inverter power circuit in Fig. 1;
Fig. 3 is the circuit theory diagrams of the circuit of power factor correction in Fig. 2.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Inverter power circuit in one embodiment, going for inverter type welder etc. needs to use in the electric equipment of inverter.Fig. 1 is the circuit theory schematic diagram of the inverter power circuit in an embodiment, and it comprises input rectification circuit 110, boost inductance L, power transistor VT 1, power factor correction (PFC) circuit 120, drive circuit (not shown), constant voltage DC output circuit 130, inverter circuit 140 and output rectification circuit 150.
Input rectification circuit 110 carries out rectification for the alternating current inputted electrical network and is changed direct current.In the present embodiment, input rectification circuit 110 comprises full bridge rectifier 112 and half-wave rectifying circuit 114.Particularly, half-wave rectifying circuit 114 comprises halfwave rectifier electric capacity C 2.Be sent to after the rectification of the alternating current exported by electrical network via full bridge rectifier 112 in half-wave rectifying circuit 114 and carry out rectification and to obtain on one just lower negative continuous half-wave voltage V d.
Boost inductance L as boosting element to improve input voltage value.One end of boost inductance L and halfwave rectifier electric capacity C 2positive pole connect, the other end then respectively with constant voltage DC output circuit 130, power transistor VT 1input connect.
Power transistor VT 1control end be connected with drive circuit, for carrying out switch motion under the driving of drive circuit, the input current waveform come on continuous regulating circuit makes its change of following output voltage waveforms and changes, to improve the power factor of input power.
Circuit of power factor correction 120 is for correcting the power factor of input power, and as shown in Figure 2, Fig. 3 is then the circuit theory diagrams in a specific embodiment to its theory diagram.Below in conjunction with Fig. 2 and Fig. 3, circuit of power factor correction 120 is described in further details.Circuit of power factor correction 120 comprises absorbing circuit 1202, Current Transmit 1, rectification circuit 1204, voltage sampling circuit 1206, filter circuit 1208, voltage follower 1210 and control circuit 1212.
Absorbing circuit 1202 is arranged in parallel in power transistor VT 1input and output between, for flowing through power transistor VT 1on peak voltage signal absorb.In the present embodiment, absorbing circuit 1202 is RCD absorbing circuit, and it comprises the first resistance R 1, the first diode D 1and the first electric capacity C 1.Wherein, the first diode D 1positive pole and power transistor VT 1input connect, negative pole then with the first electric capacity C 1connect.First resistance R1 and the first diode D 1be arranged in parallel.First electric capacity C 1the other end then respectively with power transistor VT 1output, Current Transmit 1armature winding connect.Due to power transistor VT 1operating frequency general all more than tens KHz.In speed-sensitive switch process, power transistor VT 1easily bear larger voltage and current, switching loss is comparatively large, and the heating that loss causes easily damages device simultaneously.Secondly due to the effect of boost inductance L, at power transistor VT 1in turn off process, easily bear larger peak voltage, make power transistor VT 1puncture.Therefore by arranging absorbing circuit 1202, power transistor VT can be protected 1avoid the impact that the peak voltage be subject to impacts.
Current Transmit 1armature winding on not with the first electric capacity C 1the one end connected is connected with the negative pole that power supply inputs and ground connection.Current Transmit 1secondary winding side be provided with current sampling resistor R 2.Current sampling resistor R 2be arranged in parallel in Current Transmit 1secondary winding two ends between.Current Transmit 1can will flow through power transistor VT 1on big current be converted to small area analysis signal after export.
Rectification circuit 1204 is connected to Current Transmit 1and between voltage sampling unit 1206.In the present embodiment, rectification circuit 1204 comprises rectifier diode D 3, voltage sampling unit 1206 comprises voltage sample resistance R 3.Wherein, rectifier diode D 3positive pole respectively with current sampling resistor R 2, Current Transmit 1connect, rectifier diode D 3negative pole then respectively with voltage sample resistance R 3and filter circuit 1208 connects.Through Current Transmit 1the small area analysis signal that conversion is formed is through rectifier diode D 3rectification after through by voltage sample resistance R 3to be converted to sampled voltage.
Filter circuit 1208 is connected between voltage sampling unit 1206 and voltage follower 1210.Filter circuit 1208 adopts RC filter circuit, and namely it comprises filter capacitor C 5and filter resistance R 5.Voltage follower 1210 is the U in Fig. 3 1.Wherein, filter resistance R 5one end respectively with voltage sample resistance R 3, rectifier diode D 3negative pole connect, the other end then with voltage follower U 1in-phase input end connect.Filter capacitor C 5one end and voltage follower U 1in-phase input end connect, the other end and voltage sample resistance R 3ground connection after connecting.Voltage follower U 1output then with control chip U 2connect.Voltage follower U 1the electric current isolated controlling between circuit of power factor correction and the main translation circuit of inverter power circuit can be realized, further increase the stability of circuit.Control circuit 1212 is connected with drive circuit (not shown), for according to voltage follower U 1output voltage drive circuit is controlled, to realize power transistor VT 1switch control rule, carry out the input current waveform on continuous regulating circuit, make its change of following input voltage waveform and change, and then improve the power factor of input power.
Circuit of power factor correction 120 passes through Current Transmit 1carry out current sample, can will flow through power transistor VT 1big current be converted to small area analysis signal.Small area analysis signal is converted to sampled voltage after voltage sampling circuit 1206.Sampled voltage after filtering circuit 1208 is sent to after voltage follower 1210 carries out electric current isolation and exports to control circuit 1212, to realize power transistor VT after processing 1switch control rule, carry out the input current waveform on continuous regulating circuit, make its change of following input voltage waveform and change, and then improve the power factor of input power.Pass through Current Transmit 1carry out current sample, caloric value is lower, can improve the power factor of input power further and improve the stability of circuit.And the electric current isolated controlling between circuit of power factor correction 120 and the main translation circuit of inverter power circuit can be realized by voltage follower 1210, further increase the stability of circuit.
See Fig. 1 and Fig. 3, the input of constant voltage DC output circuit 130 respectively with boost inductance L and power transistor VT 1input connect.Constant voltage DC output circuit 130 is at power transistor VT 1constant direct voltage is exported during shutoff.Particularly, constant voltage DC output circuit 130 comprises rectifier diode D 2, filter capacitor C 3and filter capacitor C 4.Rectifier diode D 2positive pole be connected with boost inductance L, negative pole then respectively with filter capacitor C 3, filter capacitor C 4positive pole connect, and as DC voltage output end, export the direct voltage V satisfied the demands cC.
In the present embodiment, inverter circuit 140 comprises medium frequency inverter circuit 142 and intermediate frequency transforming circuit 144.Exported after the rectification process of output rectification circuit 150 again by the current signal after inverter circuit 140 processes, to maintain the normal operation of inverter power circuit place equipment.
Above-mentioned inverter power circuit have employed circuit of power factor correction 120, has higher stability, decreases current harmonics component, has higher power factor, improves power quality.Further, due to the Current Transmit in circuit of power factor correction 120 1can not Power Limitation be subject to, the cyclic duration factor of its place equipment can not be affected.
The utility model additionally provides a kind of inverter type welder, comprises the inverter power circuit in previous embodiment, have higher reliability, and cyclic duration factor is higher.
Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this specification is recorded.
The above embodiment only have expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to utility model patent scope.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.

Claims (10)

1. a circuit of power factor correction, is applied in inverter power circuit, and described inverter power circuit comprises power transistor and the drive circuit for driving described power transistor to carry out switch; It is characterized in that, described circuit of power factor correction comprises:
Current transformer, the armature winding of described current transformer is connected with the output of described power transistor;
Rectification circuit, is connected with the secondary winding of described current transformer;
Voltage sampling circuit, one end is connected with the output of described rectification circuit, and the other end is connected with the secondary winding of described current transformer;
Filter circuit, is arranged in parallel with described voltage sampling circuit;
Voltage follower, the input of described voltage follower is connected with described filter circuit; And
Control circuit, is connected with the output of described voltage follower; Described control circuit is used for being connected with described drive circuit, and to control drive circuit according to the output voltage of described voltage follower thus control the switch of power transistor.
2. require the circuit of power factor correction described in 1 as requested, it is characterized in that, also comprise current sampling resistor; Described current sampling resistor is parallel to the secondary winding two ends of described current transformer.
3. circuit of power factor correction according to claim 1, is characterized in that, described rectification circuit comprises rectifier diode; Described voltage sampling circuit comprises voltage sample resistance;
The positive pole of described rectifier diode is connected with secondary winding one end of described current transformer, and the negative pole of described rectifier diode is connected with described voltage sample resistance; The other end of the secondary winding of described current transformer is connected with described voltage sample resistance.
4. circuit of power factor correction according to claim 1, is characterized in that, also comprises the absorbing circuit between input and output being parallel to described power transistor; Described absorbing circuit is for absorbing the peak voltage signal flowing to described power transistor.
5. circuit of power factor correction according to claim 4, is characterized in that, described absorbing circuit comprises the first resistance, the first electric capacity and the first diode; The positive pole of described first diode is connected with the input of described power transistor, and the negative pole of described first diode is connected with the output of described power transistor; Described first resistor coupled in parallel is in the two ends of described first diode; One end of described first electric capacity is connected with the negative pole of described first diode, and the other end is connected with the output of described power transistor, the armature winding of described current transformer respectively.
6. an inverter power circuit, comprises boost inductance, power transistor and drive circuit; One end of described booster voltage is connected with power input, and the other end is connected with the input of described power transistor; Described drive circuit is connected with the control end of described power transistor, driving described power transistor to carry out switch, it is characterized in that, also comprise circuit of power factor correction for controlling; Described circuit of power factor correction comprises:
Current transformer, the armature winding of described current transformer is connected with the output of described power transistor;
Rectification circuit, is connected with the secondary winding of described current transformer;
Voltage sampling circuit, one end is connected with the output of described rectification circuit, and the other end is connected with the secondary winding of described current transformer;
Filter circuit, is arranged in parallel with described voltage sampling circuit;
Voltage follower, the input of described voltage follower is connected with described filter circuit; And
Control circuit, is connected with the output of described voltage follower; Described control circuit is used for being connected with described drive circuit, and to control drive circuit according to the output voltage of described voltage follower thus control the switch of power transistor.
7. inverter power circuit according to claim 6, is characterized in that, described circuit of power factor correction also comprises the absorbing circuit between input and output being parallel to described power transistor; Described absorbing circuit is for absorbing the peak voltage signal flowing to described power transistor.
8. inverter power circuit according to claim 6, is characterized in that, also comprises input rectification circuit, inverter circuit and output rectification circuit; One end of described boost inductance is connected with described input rectification circuit; The other end of described boost inductance is connected with described inverter circuit; The output of described inverter circuit is also connected with described output rectification circuit.
9. inverter power circuit according to claim 6, is characterized in that, also comprises constant voltage DC output circuit; The input of described constant voltage DC output circuit is connected with described boost inductance, and the output of described constant voltage DC output circuit is as DC voltage output end.
10. an inverter type welder, is characterized in that, comprise as arbitrary in claim 6 ~ 9 as described in inverter power circuit.
CN201520541140.XU 2015-07-23 2015-07-23 Power factor correction circuit and invertion power supply circuit, contravariant welding machine Expired - Fee Related CN204810140U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201520541140.XU CN204810140U (en) 2015-07-23 2015-07-23 Power factor correction circuit and invertion power supply circuit, contravariant welding machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201520541140.XU CN204810140U (en) 2015-07-23 2015-07-23 Power factor correction circuit and invertion power supply circuit, contravariant welding machine

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108919879A (en) * 2018-07-13 2018-11-30 坎德拉（深圳）科技创新有限公司 Voltage conversion circuit
CN110417266A (en) * 2018-04-26 2019-11-05 比亚迪股份有限公司 Dcdc converter, Vehicular charger and electric vehicle

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110417266A (en) * 2018-04-26 2019-11-05 比亚迪股份有限公司 Dcdc converter, Vehicular charger and electric vehicle
US11870357B2 (en) 2018-04-26 2024-01-09 Byd Company Limited Dc-dc converter, on-board charger, and electric vehicle
CN108919879A (en) * 2018-07-13 2018-11-30 坎德拉（深圳）科技创新有限公司 Voltage conversion circuit
CN108919879B (en) * 2018-07-13 2020-06-09 坎德拉（深圳）科技创新有限公司 Voltage conversion circuit

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Granted publication date: 20151125

Termination date: 20200723