Inverter welding machine protection circuit and electric welding machine
A technology for inverter welding machines and protection circuits, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of poor protection stability, single protection function, and low safety of electricity use, and achieve improved stability and safety reliability effect
Pending Publication Date: 2020-12-18
SHENZHEN JASIC TECH
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Problems solved by technology
[0005] The purpose of this application is to provide an inverter welding machine protection circuit and an electric welding machine, aiming at solving the need to design a protection diode to protect the boost diode in the traditional technical solution of the inverter welding machine with PFC circuit, and the protection is stable Poor performance, low electricity safety, and single protection function
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[0038] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.
[0039] It should be noted that when an element is referred to as being “fixed” or “disposed on” another element, it may be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.
[0040] It is to be understood that the terms "length", "width", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "top" , "bottom", "inner", "outer" and oth...
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The invention discloses an inverter welding machine protection circuit and an electric welding machine. An input voltage detection circuit is used to detect an input voltage signal to generate an input voltage detection signal. A control circuit generates a switch control signal, a correction enabling signal and an inversion control signal according to the input voltage detection signal. An overvoltage protection circuit generates a first protection signal to disconnect a first direct current according to the input voltage signal greater than a first voltage threshold, and controls the on-offstate of the first direct current according to the switch control signal. A current regulating circuit regulates a rectified voltage signal output by a rectification circuit according to the disconnection of the first direct current. A power correction circuit performs power correction on the rectified voltage signal according to the correction enabling signal and a second direct current to generate a correction voltage signal. An inversion rectification circuit performs inversion rectification on the correction voltage signal according to the inversion control signal to generate a driving voltage signal. According to the inverter welding machine protection circuit and the electric welding machine, startup surge protection is realized, dual overvoltage protection of hardware and software is realized, and the stability and reliability of overvoltage protection are improved.
Description
technical field [0001] The application belongs to the technical field of circuit protection, and in particular relates to an inverter welding machine protection circuit and an electric welding machine. Background technique [0002] Inverter welding machine refers to the arc welding power supply using inverter technology. Its working principle is that the AC voltage of the mains is rectified by the rectifier module, the power of the PFC (Power Factor Correction, power factor correction) circuit is corrected, and the energy storage of the capacitor is filtered to become a high voltage. Direct current, direct current is converted into high-frequency AC square wave through the inverter unit, and after the AC square wave is stepped down by the main transformer, it is converted into low-voltage high-current DC output through diode rectification and inductance filtering again. [0003] At present, the traditional inverter welding machine with PFC circuit generally has a relatively ...
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Login to View More IPC IPC(8): B23K9/10
CPCB23K9/1056
Inventor 王科海黎波
Owner SHENZHEN JASIC TECH