CN2562914Y

CN2562914Y - Reverse change arc welder using polypropylene capacitor as rectification input filter capacitor

Info

Publication number: CN2562914Y
Application number: CN 02276129
Authority: CN
Inventors: 李华; 闵恭
Original assignee: SHUANGLIU MARUI ELECTRONIC EQUIPMENT FACTORY CHENGDU; SHUANGLIU MARUI ELECTRONIC EQU
Current assignee: SHUANGLIU MARUI ELECTRONIC EQUIPMENT FACTORY CHENGDU; SHUANGLIU MARUI ELECTRONIC EQU
Priority date: 2002-08-16
Filing date: 2002-08-16
Publication date: 2003-07-30
Anticipated expiration: 2012-08-16

Abstract

The utility model discloses a novel reverse change arc welder which, on the basis of the circuit of the prior reverse change arc welder, changes the middle-front stage rectification input filter capacitor in an original circle into a polypropylene capacitor from an electrolytic capacitor. And a switch-on surge protection circuit in the original circuit is omitted at the same time. The reverse change arc welder is simple in the circuit structure and high in power factor, low in the costs of the whole machine, and especially is improved in quality of the whole machine and reliability.

Description

With the polypropylene capacitor is the inverter arc welding machine of rectification input filter capacitor

The utility model relates to a kind of inverter arc welding machine.

At present, at home and abroad the prime rectification input filter capacitor in the inverter arc welding machine is the electrolytic capacitor that adopts high-voltage large-capacity all.It generally adopts 450V, two of the electrochemical capacitors of 1000 μ or several series connection, and the equal double-screw bolt extraction of pin is to satisfy the needs of big electric current.This technical scheme is actually from the indiscriminately imitating of inverse switch power supply, and the particularity of inverter arc welding machine power supply is not analyzed and is reasonably improved.Therefore it there are the following problems: one is because capacitance is very big, and electrical network just presents needle pattern and asynchronous with electrical network to the charge waveforms of electric capacity, has influenced the power factor of system.It generates heat when high-frequency high-power uses easily two because the equiva lent impedance of electrochemical capacitor is big.This heating can make the electrolyte of electrochemical capacitor progressively dry, until damaging electrolytic capacitor, jeopardizes the normal use of whole system.It three is that the electrolytic capacitor volume is big, and inconvenience is installed, and costs an arm and a leg.It also need be set up the anti-surge that closes a floodgate and impacting circuit four because capacitance is big, makes system complex, and cost rises.

The purpose of this utility model is to avoid above-mentioned weak point of the prior art, and a kind of power factor height is provided, good reliability, and line construction is simple, the inverter arc welding machine that the complete machine cost is low.

The purpose of this utility model is achieved in that prime rectification input filter capacitor in the conventional inversion arc welder, electrolytic capacitor by high-voltage large-capacity changes the polypropylene dielectric capacitor into, and the anti-surge of combined floodgate that also can save simultaneously in the existing inverter arc welding machine circuit impacts circuit.

The drawing of accompanying drawing is described as follows:

Fig. 1 is the circuit diagram of existing inverter arc welding machine.

Figure is 2 for circuit diagram of the present utility model.

The utility model is described in further detail below in conjunction with drawings and Examples, this novel inverter arc welding machine is on the basis of existing inverter arc welding machine, to have prime rectification input filter capacitor in the inverter arc welding machine circuit---two 450V now, the series connection electrochemical capacitor of 1000 μ removes, and the polypropylene dielectric capacitor of changing 8 μ f is as prime rectification input filter capacitor.Simultaneously the anti-surge of the combined floodgate in original inverter arc welding machine circuit being impacted circuit saves.Circuit makes the power supply of inversion system that buffering still be arranged after improving like this, can not cause a large amount of high-frequency harmonics to electrical network, and power factor is descended, and electrical network is caused damage.Simultaneously inversion system do not need in the three phase rectifier＜5% ripple voltage carries out filtering again, reduces the filter ripple voltage.Naturally can satisfy at this load characteristic by inversion system.Any retention time when inverter arc welding machine does not need power down in addition, it only needs " the little reservoir " of a storage instantaneous energy.Therefore inverter arc welding machine must not wanted the very big electric capacity of capacitance.After changing the little polypropylene dielectric capacitor of capacitance, its equivalent series resistance is low, and loss is little, and the permission electric current is big, volume is little, price is low.Especially it is in operation and produces heat hardly, and 3% repair rate when having eliminated former employing electrochemical capacitor has improved the reliability of complete machine.Save the anti-surge that closes a floodgate and impact circuit, make circuit structure simple, the complete machine cost descends, and the q﹠r of complete machine further improves.

Claims

1, a kind ofly improve the novel inverter arc welding machine that forms by existing inverter arc welding machine, it is characterized in that will existing inverter arc welding machine in prime rectification input filter capacitor, change the polypropylene dielectric capacitor into by the electrolytic capacitor of high-voltage large-capacity.

2, novel inverter arc welding machine according to claim 1, the anti-surge of combined floodgate that it is characterized in that saving in the existing inverter arc welding machine circuit impacts circuit.