Method for wide input voltage of direct current inverter welding machine and wide input voltage circuit thereof
An inverter circuit, DC inverter technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problem that the welding machine cannot be used normally.
Inactive Publication Date: 2017-02-22
XUCHANG UNIV
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[0004] The invention provides a method for a wide input voltage of a DC inverter welding machine and its wide input voltage circuit, which can solve the problem that the welding machine cannot be used due to the fluctuation of the input voltage that is too high or too low or even better than the input voltage during the use of the welding machine. Phenomenon of normal use
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[0023] The overall design is to ensure that no matter how the AC input voltage changes, figure 1 The front-end voltage of part B is a stable value.
[0024] The allowable input voltage variation range designed by the present invention is between AC 150V-990V, as long as the input voltage is within this range, the welding machine can work normally.
[0025] The front-end voltage of part B designed by the present invention is DC 650V, and the allowable fluctuation range is 35V up and down.
[0026]When the AC input voltage is 220V±10%, the relays K1 and K2 in part A are closed, and the MOSFET field effect transistors Q1 and Q2 are always in the disconnected state. At this time, the AC input voltage is rectified by diodes D1-D4, and directly added to both ends of the filter capacitors C1-C4, and at the same time, one end of the AC input is applied to the midpoint of the filter capacitors C1-C4 through the relay K1 to form a voltage doubler circuit. It is ensured that the front-...
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The invention relates to a method for a wide input voltage of a direct current inverter welding machine and a wide input voltage circuit thereof. The wide input voltage circuit contains an inverter circuit commonly used by the welding machine, an output filter circuit and a welding output circuit, and is characterized in that the inverter circuit commonly used by the welding machine, the output filter circuit and the welding output circuit are connected with the wide input voltage circuit; wherein the wide input voltage circuit comprises an AC (alternating current) input end, a rectifying circuit connected with the AC input end; a resistance R3, a resistance R4 and a resistance R5 are connected in series and then connected in parallel with a circuit subjected to rectification; an inductance L1 is connected in series with a field-effect tube Q1 and then connected in parallel with the circuit subjected to the rectification; a resistance R6, a resistance R7 and a resistance R8 are connected in series and then are connected in parallel with a direct current output end circuit, of which the core is added with a voltage stabilizing circuit at the front end of a welding machine inverter circuit; and when the voltage is too high, too low or fluctuated, the voltage can be stabilized within a permissible range after going through a voltage stabilizing circuit, so as to guarantee the normal operation of the welding machine.
Description
technical field [0001] The invention relates to a method for a wide input voltage of a DC inverter welding machine and a wide input voltage circuit thereof. Background technique [0002] The DC inverter welding machine is more and more accepted by the majority of users, but the inverter welding machine has strict requirements on the input voltage during use. At present, the power supply voltage of the inverter welding machine on the market is usually two levels, one is AC 220V Power supply, the other is 380V power supply, and the voltage requirements are relatively strict. When the voltage fluctuates temporarily beyond a certain range (±10% of the rated voltage), it will cause the failure of the subsequent circuit and cause a short pause in the welding process. The arc phenomenon has a great impact on the quality of the welded product. How to solve the wide voltage input range of the inverter welding machine has become a problem that must be solved. [0003] The present in...
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IPC IPC(8): B23K9/10
CPCB23K9/1043
Inventor 罗书克王红玲张元敏
Owner XUCHANG UNIV