Device for realizing soft switching while welder no-load and light load for inverse welder
A technology of inverter welding machine and soft switch, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of large circulating energy, loss of duty cycle, switching loss and increased switching noise, etc. Noise, increased switching loss, significantly improved effect
Active Publication Date: 2007-10-10
AOTAI ELECTRIC
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Problems solved by technology
[0002] At present, the soft-switching arc welding inverter mostly adopts the full-bridge inverter circuit, and the control method adopts the pulse width modulation (PWM). In the existing zero voltage switching pulse width modulation (ZVS-PWM), two Both bridge arms realize zero-voltage switching, but the zero-voltage condition of the lagging bridge arm is greatly affected by the load and input voltage. When the load is no-load or light-loaded, the zero-voltage switching condition will be lost, and there will be large circulating current energy, Problems such as loss of duty cycle increase switching loss and switching noise, which are the shortcomings of the existing technology
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[0007] In order to clearly illustrate the technical characteristics of the solution, the solution is described below through a specific implementation.
[0008] It can be seen from the drawings that the inverter welding machine of this scheme realizes the soft switching device when the welding machine is no-load and light-load. It mainly includes high-power insulated gate bipolar transistors Q1 and Q3 as the forearm and high-power insulated gate. The bipolar transistors Q2 and Q4 are lagging arms, the capacitors C1 and C3 are the parallel capacitors of the leading arm, and the capacitors C2 and C4 are the full-bridge phase-shifting resonant circuits composed of the lagging arm parallel capacitors. The full-bridge phase-shifting resonant circuit passes high frequency The transformer T primary coil N1 outputs, the high frequency transformer T secondary output coil N2 outputs the inverter power. This scheme is that there is a secondary auxiliary coil N3 on the secondary of the high f...
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The soft switch device includes mainly one phase-shifting resonator bridge circuit including two leading arms with great power transistor and capacitor and two lagging arms with great power transistor and capacitor; one high frequency transformer as the output of the phase-shifting resonator bridge circuit; and one inverter power source connected to the secondary of the high frequency transformer. The present invention features that there is also one auxiliary winding N3 connected to one current converting inductor L in the secondary of the transformer. The current converting inductor L has U-shaped ferrite core and winding of 14-21 turns, and the auxiliary winding N3 has the same turns as the secondary output winding N2 or may be replaced directly with the secondary output winding N2.
Description
Technical field: [0001] The invention relates to a welding machine used for welding in industry, in particular to a soft switching device for an inverter welding machine to realize no-load and light-load conditions of the welding machine. Background technique: [0002] At present, soft-switching arc welding inverters mostly use full-bridge inverter circuits, while the control method uses pulse width modulation (PWM). In the existing technology of zero voltage switching pulse width modulation (ZVS-PWM), two The bridge arms achieve zero voltage switching, but the zero voltage condition of the lagging bridge arm is greatly affected by the load and input voltage. When the load is at no load or light load, the conditions for zero voltage switching will be lost, and the circulating current energy will be large. Problems such as the loss of duty cycle increase the switching loss and switching noise, which are the shortcomings of the prior art. Summary of the invention: [0003] The pur...
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IPC IPC(8): B23K9/10
Inventor 陈仁富
Owner AOTAI ELECTRIC