Driving circuit, switching power supply and power supply device
By combining the bootstrap protection unit and the isolation drive unit, the problem of insufficient upper transistor drive capability in the switching power supply circuit is solved, overvoltage protection of the power supply terminal is achieved, and the reliability and safety of the circuit are improved.
CN224538043UActive Publication Date: 2026-07-21ZHEJIANG CHINT ELECTRIC CO LTD
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Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG CHINT ELECTRIC CO LTD
- Filing Date
- 2025-06-27
- Publication Date
- 2026-07-21
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Figure CN224538043U_ABST
Abstract
The application discloses a driving circuit, a switching power supply and a power supply device. The driving circuit comprises an upper tube driving module, and the upper tube driving module comprises an isolation driving unit and a bootstrap protection unit. The bootstrap protection unit is used for charging energy storage based on a first voltage when a second power tube is turned on, and providing the stored energy to the first power tube to drive the first power tube to be turned on, and performing overvoltage protection on the first power supply end when the first power tube is turned on. The isolation driving unit is used for outputting an upper tube driving signal to the first power tube in response to a valid upper tube enable signal, so as to maintain the first power tube to be turned on. The bootstrap protection unit in the application solves the problems of insufficient driving capacity and poor high-voltage resistance, and improves the reliability and safety of the driving circuit.
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