Full-bridge IGBT drive circuit and implementation method thereof

Abstract

The invention provides a full-bridge IGBT drive circuit and an implementation method thereof. According to the invention, the two IO interfaces of the CPU are used as control signals at the same time;when the two control signal levels are the same; the IGBT driving signals are not output, the full-bridge circuit does not act, the driving signals are output and the full-bridge circuit acts only when one control signal is low and the other control signal is high, and when the levels of the two control signals are different and overturn at the same time, the driving signals are switched and theoutput voltage of the full-bridge circuit overturns, so that the problem of mutual exclusiveness is solved; the driving ends of the driving chips for controlling the opening and closing of the two groups of IGBTs are connected in series, and a current-limiting resistor is connected in series in a loop, so that the two groups of IGBTs for opening and closing operations are ensured to be simultaneously switched on and off, and the problem of synchronism is solved; the input ends of the two driving chips which are connected in series are connected with the small-capacity capacitor in parallel, the capacitor and the current-limiting resistor form an RC time-delay circuit, dead zone time delay of switching-on and switching-off operation is increased, immediate switching-off after switching-on or immediate switching-on after switching-off is prevented, and the intermittent problem is solved.

Description

technical field [0001] The invention relates to the technical field of full-bridge IGBT drive, in particular to a full-bridge IGBT drive circuit and its implementation method. Background technique [0002] In the distribution network power supply system, the permanent magnet operating mechanism is widely used in the distribution line because of its advantages of simple structure, high reliability and fast operation speed. The opening and closing operation of the monostable permanent magnet operating mechanism shares an electromagnetic coil. Applying a DC voltage in the forward direction is closing, and applying a DC voltage in the reverse direction is opening. The power output stage of the conventional drive circuit is a full bridge composed of 4 IGBTs. circuit, the bus voltage is DC220V or DC380V, such as figure 1 As shown, Q801 and Q804 are turned on at the same time as closing, and Q803 and Q802 are turned on at the same time as opening. [0003] The four IGBTs in the f...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a full-bridge IGBT drive circuit and its implementation method, which aims to solve the problem that the IGBT drive circuit in the prior art cannot satisfy mutual exclusion, synchronization and intermittent at the same time, and realize low-cost, low-complexity Degree circuit realizes the driving of IGBT

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