CN2140279Y

CN2140279Y - Arc cutting and welding power supply

Info

Publication number: CN2140279Y
Application number: CN 92236837
Authority: CN
Inventors: 吴登青
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-10-13
Filing date: 1992-10-13
Publication date: 1993-08-18
Anticipated expiration: 2002-10-13

Abstract

The utility model provides an arc cutting and welding power supply which comprises that the output terminal of the main transformer B is connected with the main power supply Z of the rectifier in parallel. The arc cutting and welding power supply is characterized in that the main power Z is connected with an arc generating power composed of a capacitive voltage divider C and a bridge type rectifier D in parallel. The utility model has good steep falling property, high power factor, low energy consumption, small size and light weight. The arc cutting and welding power supply is an ideal renewal product of existing electric-arc cutting and arc welding power supply apparatus.

Description

Arc cutting and welding power supply

The utility model relates to local heat cutting and welding equipment, more particularly relates to a kind of electric arc cutting and electric arc welding power supply device.

As everyone knows, be that electric arc cuts or arc welding all requires power supply to have the external characteristics of suddenly falling, therefore mainly contain two kinds in existing electric arc cutting and electric arc welding power supply: 1, separate unit high-leakage impedance transformer; 2, each double power-supply system with a transformer composition of striking power supply and main power source satisfies respectively striking and job requirement.3, the power-supply system that consists of with transformer and relay.Therefore, obviously there is following some deficiency in prior art: the equipment heaviness; Power factor is low; The contact conversion, the fault rate height.

In view of the defects of prior art, the purpose of this utility model provides and a kind ofly can obtain good dropping characteristic, power factor height, the energy consumption low cutting of modified electric arc and electric arc welding power supply device without the contact conversion.

To achieve these goals, technical solution of the present utility model is included in the main power source of the output parallel rectifier of transformer B, it is characterized in that the striking power supply that parallel connection one is made of capacitive divider and bridge rectifier on the described main power source, wherein capacitive divider is by the decompression capacitor Co and the dividing potential drop capacitor C that is connected in parallel on the ac input end of bridge rectifier of the ac input end that is connected on bridge rectifier ₁Form.

Because the striking power supply of above-mentioned technical solution of the present utility model is to use capacitance partial pressure, but therefore saves energy not only, the power factor of compensation main transformer and other inductive load, and as long as suitably select decompression capacitor Co and dividing potential drop capacitor C ₁Capacity, need not the contact conversion and can obtain good dropping characteristic.I am through repeatedly actual measurement checking, and the utility model is than prior art, and power factor improves 15%～20%, and saves energy is more than 20%.Main transformer can dwindle 1/3 than the main transformer volume of prior art in the same specification supply unit technical solution of the present utility model in addition.

The technological means that relevant the utility model achieves the above object, effect is used, be described in detail as follows especially exemplified by two possible embodiments of the utility model and conjunction with figs., believe other purpose of the present utility model, advantage and feature, the public will obtain darker understanding more specifically therefrom.

Description of drawings

Fig. 1 is for a kind of plasma that uses technical solution described in the utility model is cut, the schematic diagram of the circuit of welding power supply device.

Fig. 2 is the schematic diagram of the circuit of a kind of electricity source for dc arc welding device of use technical solution described in the utility model.

Embodiment 1

With reference to Fig. 1, the striking power supply comprises three phase capacitance divider C and three-phase bridge rectifier circuit D in this example, and wherein three phase capacitance divider C forms like this: three dividing potential drop capacitor C ₁Constitute triangular net, three nodes of this triangular net link to each other with the ac input end of three-phase bridge rectifier circuit D respectively; Three decompression capacitor Co are connected on the ac input end of three-phase bridge rectifier circuit D respectively.In concrete the enforcement, earlier cut, weld required striking electric current and determine that the capacity of decompression capacitor Co is that 10 μ F～40 μ F are advisable according to plasma, again according to plasma cut, welding machine floating voltage setting value Vo utilizes formula Vo=Co/(3C+Co) in the V(formula V be the civil power phase voltage) calculate the dividing potential drop capacitor C ₁Capacity.

Main power source Z utilizes known technology and 1 implements by reference to the accompanying drawings.Main power source does not have special enforcement requirement, as long as satisfy plasma cutting or welding job voltage and plasma is cut, the rated power of welding machine requires.

With reference to Fig. 1, with the ac input end parallel connection of main power source Z and striking power supply, again the negative potential output of striking power supply and main power source Z and the secondary windings that meets rear series connection high frequency electric source output transformer G are got final product plasma cutting or Plasma Welding power supply.

Embodiment 2

With reference to Fig. 2, the striking power supply comprises single-phase capacitance divider C and single phase bridge type rectifier circu D in this example, and wherein single-phase capacitance divider C is in the ac input end of single phase bridge type rectifier circu dividing potential drop capacitor C in parallel ₁, two the decompression capacitor Co that connect respectively again form.In concrete the enforcement, earlier weld required striking electric current according to direct current and determine that the capacity of decompression capacitor Co is that 20 μ F～50 μ F are advisable, the setting value Vz according to the DC arc welder floating voltage utilizes Vz=Co/(2C+Co again) in the V(formula V be city's electric wire voltage or phase voltage) calculate the dividing potential drop capacitor C ₁Capacity.

Main power source Z can utilize known technology and 2 implement by reference to the accompanying drawings, as long as this main power source Z satisfies direct-current arc welding operating voltage and the requirement of welding machine rated power.

With reference to Fig. 2, the striking power supply is connected in parallel on the main power source Z, be about on the elementary winding of ac input end cross-over connection main power transformer B of striking power supply, the end of the same name of the direct current output of the dc output end of striking power supply and main power source is linked to each other.

Claims

1, a kind of arc cutting and arc welding supply unit, be included in the main power source of the output parallel rectifier of transformer B, it is characterized in that the striking power supply that parallel connection one is made of capacitive divider and bridge rectifier on the described main power source, wherein capacitive divider is by the decompression capacitor C of the ac input end that is connected on bridge rectifier ₀Dividing potential drop capacitor C with the ac input end that is connected in parallel on bridge rectifier ₁Form.

2, a kind of arc according to claim 1 cuts and the arc welding supply unit, it is characterized in that described capacitive divider is the three phase capacitance divider, bridge rectifier is three-phase bridge rectifier circuit, wherein the three phase capacitance divider by be connected on respectively in the phase line three decompression capacitor Co and respectively rectified three-phase circuit in parallel ac input end and consist of three dividing potential drop capacitor C at triangle networking ₁Form.

3, a kind of arc cutting according to claim 1 and arc welding supply unit, it is characterized in that described capacitive divider is single-phase or the two-phase capacitive divider, bridge rectifier is single-phase or the two-phase bridge rectifier, and wherein single-phase or two-phase capacitive divider is by two decompression capacitor Co and a dividing potential drop capacitor C that is connected in parallel on the ac input end of single-phase or two-phase bridge rectifier of being connected on respectively in two power lines ₁Form.

4, according to claim 1 or 2 or 3 described a kind of arc cutting and arc welding supply units, the capacity that it is characterized in that decompression capacitor Co is greater than the dividing potential drop capacitor C ₁Capacity; The span of decompression capacitor Co capacity is 10 μ F～50 μ F.