System for controlling arc striking of inverter welding machine and working method for system
A technology of inverter welding machine and arc striking device, which is applied in the field of control system and can solve the problems of low reliability, cumbersome circuits, heavy signal interference, etc.
Active Publication Date: 2017-06-27
SHANGHAI GREATWAY WELDING EQUIP
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Problems solved by technology
If a linear optocoupler, shunt or current Hall sensor is used, the circuit will be complicated, the signal interference will be heavy, the reliability will be low, and the circuit cost will be high
Method used
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[0022] The preferred embodiments of the present invention are given below in conjunction with the accompanying drawings to describe the technical solution of the present invention in detail.
[0023] Such as Figure 1 to Figure 2 As shown, the arc ignition control system of the inverter welding machine of the present invention includes a welding torch switch control circuit 1, a PWM pulse width comparison circuit 2, a control arc ignition device circuit 3, a PI adjustment circuit 4, and a PWM pulse width modulation circuit 5, wherein:
[0024] The welding torch switch control circuit 1 includes the 218th resistor R218, the 219th resistor R219, the 220th resistor R220, the 221st resistor R221, the 222nd resistor R222, the second The 17th capacitor C217, the 218th capacitor C218, the sixth optocoupler U6, the fourth voltage comparator U4A, the second relay K2B, the second relay K2B is connected in parallel with the 218th capacitor C218, the 210th The eighth capacitor C218 is co...
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The invention discloses a system for controlling arc striking of an inverter welding machine and a working method for the system. The system comprises a welding gun switch control circuit, wherein the welding gun switch control circuit comprises a 218th resistor, a 219th resistor, a 220th resistor, a 221rd resistor, a 222nd resistor, a 217th capacitor, a 218th capacitor, a sixth optocoupler, a fourth voltage comparator and a second relay, wherein the second relay is in parallel connected with the 218th capacitor; the 218th capacitor is connected with the 221rd resistor; the 221rd resistor is connected with a second pin of the sixth optocoupler; the 218th capacitor is connected with the 218th resistor; the 218th resistor is connected with the 222rd resistor; and the 222rd resistor is in series connected with a second pin of the fourth voltage comparator. According to the system disclosed by the invention, PWM pulses output by a PWM modulating unit are adopted, and a high-frequency high-voltage arc striking device is started up and shut down after signal processing at different widths during no load and welding, so that control on the arc striking device is realized.
Description
technical field [0001] The invention relates to a control system and its working method, in particular to a system for controlling the arc striking of an inverter welding machine and its working method. Background technique [0002] Inverter argon arc welding machines and plasma cutting machines need to add a high-frequency arc starting device to start the arc. The arc starting is controlled by the switch on the welding torch. After the welding current is formed, the high-frequency and high-voltage arc starting device needs to be cut off. At present, the inverter argon arc welding machine and the cutting machine judge to cut off the high-frequency high-voltage arc starting device by detecting the welding arc voltage or the welding circuit current. These two detection methods require signal isolation processing. If a linear optocoupler, shunt or current Hall sensor is used, the circuit will be cumbersome, the signal interference will be heavy, the reliability will be low, and...
Claims
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IPC IPC(8): B23K9/067B23K9/09
CPCB23K9/067B23K9/091
Inventor 崔正永易冲胡成绰
Owner SHANGHAI GREATWAY WELDING EQUIP