Isolation driving and isolation power supply integrated circuit

Abstract

The invention relates to the technical field of welding driving, and discloses an isolation driving and isolation power supply integrated circuit. The isolation driving and isolation power supply integrated circuit comprises an isolation transfer unit, an isolation power extraction unit and an isolation signal extraction unit, wherein the isolation transfer unit comprises an isolation transformer,a primary coil is arranged at a primary side of the isolation transformer, a modulation signal in input to the primary coil and comprises an on-load frequency signal, a secondary side of the isolation transformer comprises a first isolation coil and a second isolation coil, a dotted end of the first isolation coil is connected with the isolation power extraction unit, a dotted end of the first isolation coil is connected with the isolation signal extraction unit, a non-dotted end of the second isolation coil is connected with the isolation power extraction unit, the dotted end of the first isolation coil is connected with the isolation signal extraction unit, the isolation transfer unit is used for transmitting the modulation signal, the isolation power extraction unit is used for providing a power supply, and the isolation signal extraction unit is used for providing control pulse. Isolation of the control pulse and isolation of the power supply can be achieved by the isolation transformer, and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of welding drive, more specifically, it relates to a two-in-one circuit of isolated drive and isolated power supply. Background technique [0002] In the TIG welding of aluminum and its alloys, since the surface of the aluminum material will chemically react with the oxygen in the air to form an oxide film, the melting point of this oxide film is much higher than that of the aluminum material, such as DC TIG welding with positive polarity connection , The surface of the molten pool is covered by an oxide film, which cannot meet the requirements of the welding process, and the welding cannot be carried out. When the negative polarity connection is used, the tungsten rod is the positive pole, and electrons are emitted from the workpiece to the tungsten pole, which has the effect of cleaning the oxide film, but the tungsten pole burns seriously, and the weld penetration is not enough. Therefore, AC arc must be ...

AI Technical Summary

Problems solved by technology

[0004] In order to realize the isolated drive, in addition to the isolation of the power supply, the two trigger pulses A and B provided by the control circuit with a phase difference of 180 degrees also need to be isolated and transmitted through two optocouplers U2 and U5, because the DC-DC module internal The circuit is complex and costly, and the cost of the optocoupler is also high, so the overall cost of the existing solution is relatively high, which weakens the competitiveness of the product for welding machine products with increasing pressure on competitive costs

Images