一种PWM模式反激强迫谐振电路及其控制方法
By using a PWM mode flyback forced resonant circuit, and utilizing a resonance cancellation circuit and a control circuit to release residual charge before the switching transistor is turned on, the loss and noise problems caused by resonance are solved, achieving zero-voltage turn-on and noise reduction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- AEROSPACE SCI & IND INERTIA TECH CO LTD
- Filing Date
- 2020-12-17
- Publication Date
- 2026-07-17
AI Technical Summary
In existing flyback DC/DC circuits, resonance causes random high voltages when the MOSFET is turned on, resulting in losses and noise. Frequency modulation methods are costly and complex to operate, making them difficult to apply widely.
A PWM-mode flyback forced resonant circuit is used. Through a resonance elimination circuit and a control circuit, the primary side residual charge is released before the first switch is turned on to eliminate resonance. The circuit includes a transformer, a first switch, a resonance elimination circuit, and a control circuit. Resonance elimination is controlled by a delay circuit, an acceleration circuit, and a conversion circuit.
This achieves zero-voltage turn-on of the MOSFET, reducing turn-on losses and noise. Theoretically, the noise is reduced by half, and the MOSFET loss is also reduced.
Smart Images
Figure CN114649926B_ABST