Super speed inverting pole-changing square wave current arc-welding power supply device
An arc welding power supply and polarity-changing technology, which is applied in arc welding equipment, welding equipment, manufacturing tools, etc., can solve the problems of slow current rise rate and fall rate, low working frequency of polarity-changing current, etc.
Inactive Publication Date: 2008-02-20
BEIHANG UNIV
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Problems solved by technology
The power supply device of the present invention is aimed at solving the problems of the conventional variable polarity square wave power supply outputting variable polarity current with low working frequency and slow current rising rate and falling rate when the current polarity is switched.
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Embodiment Construction
[0010] The present invention will be further described in detail below in conjunction with the accompanying drawings.
[0011] Please refer to Fig. 1, the present invention is an ultra-fast conversion variable polarity square wave current arc welding power supply device, a full-bridge conversion circuit is connected in parallel between the positive pole and the negative pole of the DC power supply, A parallel absorbing protection circuit is connected in parallel. The parallel absorption protection circuit consists of a power diode D, an electrolytic capacitor C E , a high-frequency capacitor C and a power resistor R, which reliably ensure that the first power switch tube T 1 and the second power switch tube T 2 , the third power switch tube T 3 and the fourth power switch tube T 4 Normal operation of the circuit at high frequency polarity reversal. A freewheeling inductance L and a power diode D are connected to the positive pole of the DC power supply and the positive po...
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The present invention discloses a super rapid exchanging polarity changing square wave current arc welding power supply device used for electric arc welding, which comprise a DC power supply, a full bridge transfer circuit, a drive circuit, a control system, a parallel absorbing protecting circuit and an assistant DC power supply. The parallel absorbing protecting circuit consists of a power diode D, an electrolytic condenser CE, a high frequency capacitance C and a power resistor R. For the power supply of the present invention, through connecting a follow current inductance L between the DC power supply and the full bridge transfer circuit, and synchronously increasing the power diode D, the electrolytic condenser CE, the high frequency capacitance C, the power resistor R and the assistant DC power supply, the follow current inductance L ensures the output current having rapid current ascension rate and the current descending rate respectively not less than 50A / Mus by using the characteristic that: the current flowing can not suddenly exchange, and transfer frequency of the output polarity square wave is 1Hz to 20 kHz, and the positive conducting time ratio is 10 percent to 90 percent, and the current amplitude value of the positive and negative half wave is 5 to 400 A.
Description
technical field [0001] The present invention relates to a power supply device suitable for arc welding, more particularly, it refers to a supersonic device with fast current rising rate and falling rate, and the output variable polarity square wave current frequency can reach ≥ 20kHz (ultrasonic frequency) Fast switching variable polarity square wave current arc welding power supply unit. Background technique [0002] Variable polarity welding power supply is a new type of welding power supply that replaces sine wave AC and square wave AC power supplies, and is mainly used in tungsten argon arc welding and plasma arc welding. The variable polarity power supply is actually a square-wave AC power supply whose current frequency, positive and negative half-wave current amplitudes, and time ratios can be adjusted independently. The structure of a conventional variable polarity power supply is shown in Figure 2. Due to the design characteristics of the power supply structure, whe...
Claims
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Inventor 齐铂金从保强黄松涛
Owner BEIHANG UNIV