A power converter, a control method and a controller thereof, and a power supply system
By configuring the controller in the three-level boost circuit to simultaneously turn the switch on or off before mode switching, the problem of switch overvoltage failure is solved, and the reliability and safety of the circuit are improved.
CN122178739APending Publication Date: 2026-06-09SUNGROW POWER SUPPLY CO LTD
Patent Information
- Authority / Receiving Office
- CN Β· China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SUNGROW POWER SUPPLY CO LTD
- Filing Date
- 2026-01-27
- Publication Date
- 2026-06-09
AI Technical Summary
Technical Problem
In a three-level boost circuit, the switch is at risk of overvoltage failure, which affects the reliability and safety of the circuit.
Method used
Before switching modes, the controller is configured to simultaneously turn on or off the first and second switches, releasing the electrical energy of the inductor and parasitic capacitance through a specific circuit path to prevent the switches from being subjected to excessive voltage.
Benefits of technology
This improves the operational safety of the switch and the reliability of the power converter, prevents switch failure due to overvoltage, and enhances the overall safety of the circuit.
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Smart Images
Figure CN122178739A_ABST
Abstract
The application provides a power converter and a control method, a controller and a power supply system thereof, which are applied to the technical field of power electronics. The power converter comprises a three-level boost circuit and a controller. In the control of the three-level boost circuit, the first switch and the second switch are switched from the first switch mode to the second switch mode. Before the switching from the second switch mode to the first switch mode, the controller controls the first switch and the second switch to be simultaneously turned on or turned off. When the first switch and the second switch are simultaneously turned on, the electric energy stored in the inductance and the parasitic capacitance in the three-level boost circuit is released through the path formed by the first switch and the second switch. When the first switch and the second switch are simultaneously turned off, the electric energy stored in the inductance and the parasitic capacitance is released through the path formed by the first diode, the second diode, the upper half bus capacitor and the lower half bus capacitor in the three-level boost circuit. The overvoltage failure of the first switch or the second switch is avoided, and the reliability and safety of the whole power converter are improved.
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