CN102594174A - Welding power source for full voltage range - Google Patents

Welding power source for full voltage range Download PDF

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Publication number
CN102594174A
CN102594174A CN2012100307839A CN201210030783A CN102594174A CN 102594174 A CN102594174 A CN 102594174A CN 2012100307839 A CN2012100307839 A CN 2012100307839A CN 201210030783 A CN201210030783 A CN 201210030783A CN 102594174 A CN102594174 A CN 102594174A
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CN
China
Prior art keywords
source
full
circuit
welding current
voltage
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Pending
Application number
CN2012100307839A
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Chinese (zh)
Inventor
尤志春
张辉
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SHANGHAI WEITELI WELDING EQUIPMENT MANUFACTURING Co Ltd
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SHANGHAI WEITELI WELDING EQUIPMENT MANUFACTURING Co Ltd
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Priority to CN2012100307839A priority Critical patent/CN102594174A/en
Publication of CN102594174A publication Critical patent/CN102594174A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a welding power source suitable for a full voltage range. The welding power source for the full voltage range comprises a power input rectifying circuit, a preceding boost circuit, and a later full bridge phase-shift inverter circuit. Single phase or triphase alternating current in the full voltage range is rectified by the power input rectifying circuit and then serves as input voltage of the preceding boost circuit which boosts the input voltage to a fixed voltage value, and the later full bridge phase-shift inverter circuit is used for reducing switching loss. The welding power source for the full voltage range has the advantages of being high in efficiency and energy-saving; and capable of improving the power factors of a welder, reducing the reactive power loss, and increasing the generality of the welder.

Description

A kind of source of welding current of full voltage range
Technical field
The present invention relates to a kind of welder power technical field, relate in particular to a kind of energy-efficient source of welding current that is applicable to full voltage range.
Background technology
Along with the raising that the development of power electronic technology and the whole world require energy-saving and emission-reduction, arc welding inverter in the application of welding profession more and more widely and progressively occupies main flow market.Domestic research to arc welding inverter is started late, and up to the nineties in last century, domestic part scholar, expert and enterprise just begin to pay close attention to the application of inversion transformation technique in Arc Welding Power.After 2000, minority state internal welding machine successful development also puts into production.
For the traditional welding power supply, adopt structure as shown in fig. 1 mostly.As shown in fig. 1, power frequency supply 11 is high-frequency inversion 12 behind over commutation, then the structure of full-wave rectification 13.Such structure exists very big defective.At first, the employed source of welding current of prior art, the electric pressure that can be suitable for is fixed.When line voltage has fluctuation its welding performance and power source performance all can be very poor.Secondly, welding machine when full load is used, causes very big pollution because its power factor (PF) is very low to electrical network as high power load.Moreover, the employed source of welding current in the prior art, it is single-phase, three-phase input power supply is not general, has the danger of aircraft bombing like careless wrong electric pressure.At last, the employed source of welding current in the prior art, traditional hard switching circuit is partly adopted in its inversion, its switching tube caloric value is increased but also has reduced the arcing time factor of whole electric welding machine.
Therefore in order to improve the versatility of welding machine, improve its power factor, reduce the heating loss, reach energy-efficient general purpose, it is not enough only reducing the performance that changes switching tube, must change its power supply topologies simultaneously.Therefore be badly in need of in the prior art wanting a kind of new source of welding current structure, can improve its versatility, can also improve its power factor, reduce the heating loss, realize energy-efficient.
Summary of the invention
In order to overcome the defective that exists in the prior art, the present invention provides a kind of energy-efficient source of welding current that is applicable to full voltage range, and this power supply can effectively improve the welder power factor, reduces reactive loss, increases the versatility of welding machine.
In order to realize the foregoing invention purpose; The present invention provides a kind of source of welding current of full voltage range, it is characterized in that, comprising: the power supply input rectification circuit; Prime booster circuit, back level full-bridge phase shifting inverter circuit; This power supply input rectification circuit with the alternating current of the full voltage range of single-phase or three-phase after rectification as the input voltage of electrode booster circuit, it is a fixed voltage value that this prime booster circuit boosts input voltage, this back level full-bridge phase shifting inverter circuit is used to reduce switching loss.
Further, this prime booster circuit is made up of electric capacity, energy storage inductor, switching tube and fly-wheel diode and PFC control circuit.
Further, this back level full-bridge phase shifting inverter circuit comprises four switching tubes, parallelly connected with this four switching tubes respectively electric capacity and pulsactor.
Further; Four switching tubes of this back level full-bridge phase shifting inverter circuit, electric capacity parallelly connected with this four switching tubes and the leakage inductance of pulsactor and transformer are formed a resonant element respectively, and four switching tubes that make this back grade full-bridge phase shifting inverter circuit are switch under zero voltage condition successively.
Further, the alternating current of this full voltage range is 208 volts to 460 volts.This fixed voltage value is 700 volts.
Further; This output voltage U pv of this prime booster circuit and the relational expression of input voltage Udc are ; Wherein D is the duty ratio of chopper circuit; D=ton/T; Ton is the switch conduction time, and T is the switch conduction cycle.
Further, this source of welding current also comprises a full-wave rectifying circuit, and this full-wave rectifying circuit comprises at least 2 diode connected in parallel and an electric capacity.
Further; This source of welding current also comprises a welding control system, and this welding control system comprises the magnitude of voltage that is connected with power supply input and individual event/three-phase detection module and the output voltage current detection module that is connected with the output of these whole rectification circuits.This welding control system also comprises an input module and a display module.
Compared with prior art, the source of welding current that is applicable to full voltage range provided by the present invention, this power supply can effectively improve the welder power factor, reduces reactive loss, increases the versatility of welding machine.The input voltage range of this source of welding current is 208 ~ 460V, and single-phase alternating current and three-phase alternating current are general.Utilize the source of welding current provided by the present invention, its power factor (PF) can reach 99%, and efficient can reach 90%, and total harmonic distortion THD < 5%.
Description of drawings
Can graphicly further be understood through following detailed Description Of The Invention and appended about advantage of the present invention and spirit.
Fig. 1 is the structural representation of the employed source of welding current in the prior art;
Fig. 2 is the structural representation of the source of welding current of full voltage range provided by the present invention;
Fig. 3 is the detailed circuit schematic of the source of welding current of full voltage range provided by the present invention.
Embodiment
Specify specific embodiment of the present invention below in conjunction with accompanying drawing.
The employed source of welding current in the prior art, owing to adopt power frequency supply high-frequency inverter inversion behind over commutation, and then the structure of process full-wave rectifying circuit rectification, therefore have many technological deficiencies.The technological deficiency of one of them outbalance is exactly that the employed source of welding current of the prior art electric pressure that can be suitable for is fixed.When line voltage has fluctuation its welding performance and power source performance all can be very poor.The object of the present invention is to provide a kind of source of welding current that is applicable to full voltage range.Usually, full voltage range refers to the voltage range of the employed interchange point of overwhelming majority of countries in the world wide, between 208 volts to 460 volts.
In order to realize the foregoing invention purpose; The present invention provides a kind of source of welding current of full voltage range; Comprise: the power supply input rectification circuit, prime booster circuit, back level full-bridge phase shifting inverter circuit, this power supply input rectification circuit is with the alternating current of the full voltage range of single-phase or the three-phase input voltage as the electrode booster circuit after rectification; It is a fixed voltage value that this prime booster circuit boosts input voltage, and this back level full-bridge phase shifting inverter circuit is used to reduce switching loss.As shown in Figure 2, Fig. 2 is the structural representation of the source of welding current of full voltage range provided by the present invention.The input voltage of power supply 101 is between 208 volts to 460 volts, provides single-phase or three-phase alternating current.The input voltage of power supply 101 boosts through the booster circuit 103 that comprises an intelligent PFC chip (Power Factor Correction power factor circuit) through behind the frequency rectifier 102.This booster circuit 103 makes the input voltage after the rectification be raised to the required voltage of late-class circuit full-bridge phase shifting inverter circuit.In the present invention, this booster circuit 103 comprises an IGBT switching tube, when input voltage is in full voltage range, all can be risen to a fixed voltage value by this booster circuit 103.Full-bridge phase shifting inverter circuit 104 with soft switching function is used to reduce switching loss.Soft switching function is meant the principle of using resonance, makes the electric current (or voltage) in the switching device press sine or the variation of quasi sine rule.When the electric current natural zero-crossing, make device turn-off (or voltage is when being zero, make device open-minded), thereby reduce switching loss.And then through transformer 105 transformations and full-wave rectifying circuit 106 rectifications acquisition one welding output voltage (or electric current).
In order to realize better technique effect, the present invention also provides a welding control system 200 simultaneously, and this welding control system can be controlled the driving of IGBT switching tube.This welding control system comprises that also a magnitude of voltage detects and single-phase three-phase detection module 201 and output voltage current detection module, even an input display module 203, is used for controlling better this full voltage source of welding current.
Below will combine Fig. 3, specify the electrical block diagram of this full voltage source of welding current.As shown in Figure 3, this circuit comprises input power supply 101, frequency rectifier 102, prime booster circuit 103, back level full-bridge phase shifting inverter circuit 104, transformer 105 and full-wave rectifying circuit 106.
Input power supply 101 is used to provide single-phase or the three-phase voltage value is the alternating current of 208V ~ 460V.As 103 inputs of prime boost PFC circuit, control inductance L 1 energy storage and release after 102 rectifications of alternating current process frequency rectifier through the break-make of control Q switching.Thereby make voltage be raised to the required voltage of late-class circuit full-bridge phase shifting inverter circuit.Wherein thereby the control of switching tube Q mainly contains the PFC control chip and accomplishes and improved power factor (PF).
This prime booster circuit 103 is made up of capacitor C 1, energy storage inductor L1, switching tube Q and afterflow diode D and PFC control circuit (see figure 2).The PFC control chip is through detecting the output voltage of rectifier bridge 102 (as shown in Figure 3); And inductance L 1 current waveform; Calculate the duty ratio of the gate leve control impuls of switching tube Q at chip internal; Through regulating the size of its duty ratio, come the power factor (PF) of machine is continued to correct, thereby make its power factor (PF) reach more than 0.99.Because the switching tube Q of prime booster circuit 103 is IGBT switching tubes, so, can make the alternating current of various electric pressures, be raised to fixing value by the booster circuit that the IGBT switching tube is formed.For example, no matter the magnitude of voltage of input voltage is 208 volts or 460 volts, is all risen to 700 volts through behind this prime booster circuit.Wherein the relational expression of prime voltage lifting PFC circuit output voltage Upv and input voltage Udc is ; Wherein D is the duty ratio of chopper circuit; D=ton/T; Ton is the switch conduction time, and T is the switch conduction cycle.
The prime booster circuit 103 logical duty ratio through control switch pipe Q is by sinusoidal rule, and with the input voltage homophase, thereby the current waveform of control inductance L be sinusoidal absolute value, is sine wave thereby make input current waveform.And, make power factor (PF) near 1 with the input voltage homophase.
Back level full-bridge phase shifting inverter circuit 104 is to realize (see figure 2) through the bridge Phase shifted PWM Controlled chip.As shown in Figure 3; The bridge Phase shifted PWM Controlled circuit is by the bridge Phase shifted PWM Controlled chip, amplifier U1, and the Hall current instrument transformer is formed; Electric current is given to be compared with value current feedback through regulating; Magnitude of voltage after amplifier calculates is given as the bridge Phase shifted PWM Controlled chip, and the size of regulating phase shifting angle between Q1 and Q4 and Q2 and the Q3 is controlled the size of machine electric current.(leakage inductance of C3 ~ C6) and pulsactor L2 and transformer is as resonant element, and four switching tubes that make FB (Full-Bridge is called for short FB) pwm converter are switch under zero voltage condition successively to utilize the electric capacity of the output two ends parallel connection of Q1 ~ Q4.Like this, just improve the condition of work of switching tube, reduced switching loss, realized the soft switch of constant frequency, improved efficient.
Voltage behind level full-bridge phase shifting inverter circuit 104 later is through transformer 105 step-downs, and the electric current after the step-down is imported after full-wave rectifying circuit 106 rectifications.As shown in Figure 3, this full-wave rectifying circuit 106 comprises a diode D1 D2 of a parallel connection at least, and inductance L 2.
Compared with prior art, the source of welding current that is applicable to full voltage range provided by the present invention, this power supply can effectively improve the welder power factor, reduces reactive loss, increases the versatility of welding machine.The input voltage range of this source of welding current is 208 ~ 460V, and single-phase alternating current and three-phase alternating current are general.Utilize the source of welding current provided by the present invention, its power factor (PF) can reach 99%, and efficient can reach 90%, and THD < 5%.
Described in this specification is preferred embodiment of the present invention, and above embodiment is only in order to explain technical scheme of the present invention but not limitation of the present invention.All those skilled in the art all should be within scope of the present invention under this invention's idea through the available technical scheme of logical analysis, reasoning, or a limited experiment.

Claims (10)

1. the source of welding current of a full voltage range; It is characterized in that; Comprise: the power supply input rectification circuit, prime booster circuit, back level full-bridge phase shifting inverter circuit, said power supply input rectification circuit is with the alternating current of the full voltage range of single-phase or the three-phase input voltage as the electrode booster circuit after rectification; It is a fixed voltage value that said prime booster circuit boosts input voltage, and said back level full-bridge phase shifting inverter circuit is used to reduce switching loss.
2. the source of welding current as claimed in claim 1, said prime booster circuit is made up of electric capacity, energy storage inductor, switching tube and fly-wheel diode and PFC control circuit.
3. the source of welding current as claimed in claim 1, said back level full-bridge phase shifting inverter circuit comprises four switching tubes, respectively with parallelly connected electric capacity and the pulsactor of described four switching tubes.
4. the source of welding current as claimed in claim 3; Four switching tubes of said back level full-bridge phase shifting inverter circuit, electric capacity parallelly connected with described four switching tubes and the leakage inductance of pulsactor and transformer are formed a resonant element respectively, and four switching tubes that make said grade full-bridge phase shifting inverter circuit afterwards are switch under zero voltage condition successively.
5. the source of welding current as claimed in claim 1, the alternating current of said full voltage range are 208 volts to 460 volts.
6. the source of welding current as claimed in claim 1, said fixed voltage value are 700 volts.
7. the source of welding current as claimed in claim 1; The said output voltage U pv of said prime booster circuit and the relational expression of input voltage Udc are ; Wherein D is the duty ratio of chopper circuit; D=ton/T; Ton is the switch conduction time, and T is the switch conduction cycle.
8. the source of welding current as claimed in claim 1, the said source of welding current also comprises a full-wave rectifying circuit, said full-wave rectifying circuit comprises at least 2 diode connected in parallel and an electric capacity.
9. the source of welding current as claimed in claim 1; The said source of welding current also comprises a welding control system, and said welding control system comprises the magnitude of voltage that is connected with power supply input and individual event/three-phase detection module and the output voltage current detection module that is connected with the output of said whole rectification circuits.
10. the source of welding current as claimed in claim 9, said welding control system also comprise an input module and a display module.
CN2012100307839A 2012-02-13 2012-02-13 Welding power source for full voltage range Pending CN102594174A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103369806A (en) * 2013-07-24 2013-10-23 深圳市朗文科技实业有限公司 Electronic ballast of single stage circuit structure
CN103647464A (en) * 2013-11-28 2014-03-19 江西洪都航空工业集团有限责任公司 High-voltage and intermediate-frequency AC/DC conversion system
CN104242637A (en) * 2013-06-10 2014-12-24 现代自动车株式会社 Duty control method and system for low-voltage DC-DC converter
WO2016049989A1 (en) * 2014-09-30 2016-04-07 深圳市茂润电气有限公司 Step-up automatic matching circuit, and power conversion device used for smart travel
CN107707003A (en) * 2017-09-08 2018-02-16 广州双穗电气设备有限公司 PWM pulse width type constant-current charge formula capacitor discharge welding charge control systems

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1712170A (en) * 2004-06-22 2005-12-28 林肯环球公司 Power source for high current welding
CN101465598A (en) * 2009-01-08 2009-06-24 普天信息技术研究院有限公司 AC/DC converter
CN101577487A (en) * 2008-08-26 2009-11-11 江苏中凌高科技有限公司 Capacitor-decoupling three-phase active power factor corrector
CN102000900A (en) * 2010-10-21 2011-04-06 赵玉林 Digital intelligent electric welder

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1712170A (en) * 2004-06-22 2005-12-28 林肯环球公司 Power source for high current welding
CN101577487A (en) * 2008-08-26 2009-11-11 江苏中凌高科技有限公司 Capacitor-decoupling three-phase active power factor corrector
CN101465598A (en) * 2009-01-08 2009-06-24 普天信息技术研究院有限公司 AC/DC converter
CN102000900A (en) * 2010-10-21 2011-04-06 赵玉林 Digital intelligent electric welder

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104242637A (en) * 2013-06-10 2014-12-24 现代自动车株式会社 Duty control method and system for low-voltage DC-DC converter
CN103369806A (en) * 2013-07-24 2013-10-23 深圳市朗文科技实业有限公司 Electronic ballast of single stage circuit structure
CN103369806B (en) * 2013-07-24 2016-02-24 深圳市朗文科技实业有限公司 The electric ballast of single stage circuit structure
CN103647464A (en) * 2013-11-28 2014-03-19 江西洪都航空工业集团有限责任公司 High-voltage and intermediate-frequency AC/DC conversion system
WO2016049989A1 (en) * 2014-09-30 2016-04-07 深圳市茂润电气有限公司 Step-up automatic matching circuit, and power conversion device used for smart travel
CN107707003A (en) * 2017-09-08 2018-02-16 广州双穗电气设备有限公司 PWM pulse width type constant-current charge formula capacitor discharge welding charge control systems
CN107707003B (en) * 2017-09-08 2020-12-08 广州双穗电气设备有限公司 PWM pulse width type constant-current charging type capacitor energy storage welding charging control system

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Application publication date: 20120718