Convenient-to-control isolation driving circuit system based on metal oxide semiconductor field effect transistor (MOSFET)

By using a combination of discrete transformers and optocouplers to create an isolated drive circuit, the insulation and compatibility issues of the MOSFET isolation drive circuit in high-voltage, high-power power supplies are solved, achieving the effects of small transformer size, low insulation requirements, and wide applicability.

CN122292849APending Publication Date: 2026-06-26QINGDAO HANTEK ELECTRONICS
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Patent Information

Application Number
CN202610656936.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-13
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

In existing high-voltage, high-power power supplies, the isolation drive circuit of MOSFET has problems such as large transformer size, difficult winding, high insulation requirements, and difficulty in matching the drive transformer.

Method used

By employing an input voltage regulator circuit, a transformer drive circuit, a transformer secondary rectifier and filter circuit, and a drive output and negative voltage bootstrap circuit, and combining discrete transformers and optocouplers, isolated driving of MOSFETs is achieved, reducing insulation requirements and adapting to different MOSFET parameters.

Benefits of technology

It effectively reduces the insulation requirements of transformers, simplifies winding design, has a wide range of applications, strong adaptability, and is suitable for various MOSFET models.

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Abstract

The invention discloses a convenient-to-control isolation driving circuit system based on an MOSFET. The convenient-to-control isolation driving circuit system comprises an input voltage stabilizing circuit, a transformer driving circuit, a transformer secondary rectifying and filtering circuit and a driving output and negative voltage bootstrap circuit, wherein the input voltage stabilizing circuit comprises a linear voltage stabilizing element, a driving power supply, a feedback network and a filter capacitor; the input end of the linear voltage stabilizing element is coupled with a driving power supply, the driving power supply inputs voltage VIN, and the linear voltage stabilizing element is connected to the ground by being coupled with a feedback network; according to the auxiliary power supply, a secondary winding of a transformer in an auxiliary power supply in the prior art is separated out and placed into a separate transformer, the insulation requirement of the transformer of the auxiliary power supply is effectively lowered, more MOSFETs are easy to drive, and through driving of the high-voltage MOSFETs, the stability of the auxiliary power supply is improved, and the service life of the auxiliary power supply is prolonged. And the problem of excessive auxiliary power supply windings is effectively solved.
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