Isolated drive circuit of DC converter

Abstract

The invention discloses an isolated drive circuit of a DC converter, which relates to technical field of circuit drive. The isolated drive circuit of the DC converter comprises: an isolated transformer, a primary winding, a primary winding drive circuit, a first secondary winding and a second secondary winding whose same name ends are opposite, and a first switch pipe and a second switch pipe; the different name end of the first secondary winding is connected with source electrode of the first switch pipe, the same name end is connected with the drain electrode of the first switch pipe through a first resistance, the different name end of the first secondary winding is connected with the grid electrode of the first switch pipe through a first diode; the different name end of the first secondary winding is connected with the anode of the first diode; the same name end of the second secondary winding is connected with the source electrode of the second switch pipe, the different name end is connected with the drain electrode of the second switch pipe through a second resistance, the same name end of the second secondary winding is connected with the grid electrode of the second switch pipe through a second diode; the same name end of the second secondary winding is connected with the anode of the second diode. The whole circuit has simple topology, high reliability, can be used for many occasions flexibly.

Description

technical field [0001] The invention relates to the technical field of circuit driving, in particular to an isolated driving circuit for a DC converter. Background technique [0002] At present, there are many topologies of isolated drive circuits for half-bridge or full-bridge DC converters. With the further development of half-bridge or full-bridge DC converter circuit applications, new requirements are put forward for isolated drive circuits. The isolated drive circuit that can adjust the pulse width has attracted more and more attention. [0003] In the process of implementing the present invention, the inventors found that the topological form of the isolated drive circuit that can realize both frequency modulation and pulse width modulation is relatively limited, and its requirements on the anti-interference and control timing of the drive signal are usually very high, resulting in existing The reliability of the isolated driving circuit of the DC converter is low. T...

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Problems solved by technology

[0003] In the process of implementing the present invention, the inventors found that the topological form of the isolated drive circuit that can realize both frequency modulation and pulse width modulation is relatively limited, and its requirements on the anti-interference and control timing of the drive signal are usually very high, resulting in existing Low reliability of DC converter isolation driving circuit

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