Inverter power device for medium frequency resistance welding
A technology of inverter power supply and power supply device, applied in welding power supply and other directions, can solve the problems of increasing rectifier tube consumption and reducing the efficiency of inverter power supply, etc., and achieve the effect of improving control performance and reducing volume and weight
Inactive Publication Date: 2006-09-06
BEIJING UNIV OF TECH
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Problems solved by technology
The disadvantage of this kind of rectifier circuit is that two diodes are turned on for each half-wave of AC, and the power consumed on the rectifier is figure 1 2 times that of the rectifier circuit
Since the resistance welding power supply has the characteristics of low voltage and high current, doubling the consumption of the rectifier tube will seriously reduce the efficiency of the inverter power supply, so the resistance welding inverter power supply does not use this rectification circuit
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[0022] The present invention implements according to aforementioned accompanying drawing 2-6. The device adopts a single-coil double-inductance double-tube full-wave rectification circuit. In this kind of full-wave rectification circuit, only one diode is turned on every half cycle of AC, and the back pressure of the cut-off diode is equivalent to figure 1 Half of the reverse voltage that the middle diode bears, the reverse voltage is the voltage of the secondary coil N21 of the transformer. The conduction diode loss and figure 1 The losses of the diodes are the same. In order to reduce the tube consumption of the diode, select the Schottky diode.
[0023] In order to make the rectifier circuit adapt to the high current requirements of resistance welding, the design adopts the scheme that the number of turns of the secondary coil of the transformer is 1, the number of turns of the inductance coil is also 1, and the diodes are connected in parallel with multiple groups of re...
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Abstract
The inverter power source for medium frequency resistance welding includes transformer, bridge inverter connected to the primary coil of the transformer, one pair of diode rectifier units connected to the secondary coil of the transformer with the common point of the rectifier pair being one of the output ends of the power source, one set of serially connected single-turn windings on the inductor with two ends connected to the other ends of the rectifier pair with the connecting point of the serially connected single-turn windings being the other output end of the power source. The several sets of output are connected parallelly to constitute the total output of the power source. The present invention solves the problem of high back voltage in the off rectifying diode in the rectifier unit to raise the switching frequency of the inverter power source for resistance welding reach 20 KHz.
Description
technical field [0001] The invention relates to a medium-frequency resistance welding inverter power supply device, which is suitable for the field of welding technology. Background technique [0002] Resistance welding is a method of welding workpieces by resistance heat, which is mainly used in automobile and aviation manufacturing industries. The main equipment in the resistance welding machine is the resistance welding power supply unit. Due to the advantages of small size, light weight, and good controllability of the inverter power supply device, in the early 1980s, the resistance welding inverter power supply device began to replace the power frequency secondary rectification power supply device, as described in patent ZL93219514.8, US4973815. The switching frequency is an important technical index to measure the design level of the inverter power supply device. At present, the problem existing in the resistance welding inverter power supply device is that the switc...
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IPC IPC(8): B23K11/24
Inventor 李西恭刘嘉陈树君白韶军杨录东张亮
Owner BEIJING UNIV OF TECH