Passive Clamp Circuit for Efficient Flyback Converters
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Summary
Problems
Flyback topology-based power converters face inefficiencies due to discontinuous operation modes, leading to significant energy loss and heat dissipation, particularly in AC-DC adapters for portable devices, where the leakage inductance energy is not effectively recycled, resulting in reduced power density and increased size.
Innovation solutions
The implementation of a passive clamp circuit with an auxiliary energy storage system that redirects leakage inductance energy to reduce RMS current and charge through the clamp capacitor, utilizing diodes and rectifiers to manage energy flow and create zero-voltage switching conditions, thereby enhancing efficiency and power density.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If flyback topology operates in discontinuous mode, then the circuit simplicity is maintained, but energy loss increases and efficiency decreases
Why choose this principle:
The patent converts the harmful leakage inductance energy into useful energy by redirecting it through the passive clamp circuit to charge the clamp capacitor, which then provides energy during the main switch off-time, transforming the harmful effect into a beneficial energy source that improves efficiency without adding active components
Principle concept:
If flyback topology operates in discontinuous mode, then the circuit simplicity is maintained, but energy loss increases and efficiency decreases
Why choose this principle:
The clamp capacitor stores energy from the leakage inductance and automatically provides it during the switch off-period, creating a self-sustaining energy recycling mechanism that reduces overall energy loss without requiring external control or active intervention
Application Domain
Data Source
AI summary:
The implementation of a passive clamp circuit with an auxiliary energy storage system that redirects leakage inductance energy to reduce RMS current and charge through the clamp capacitor, utilizing diodes and rectifiers to manage energy flow and create zero-voltage switching conditions, thereby enhancing efficiency and power density.
Abstract
A circuit having primary and secondary sides includes a flyback converter having an input voltage source and a transformer with primary and secondary windings. A main switch is in series with the primary winding. A passive clamp circuit includes a clamp diode, a clamp capacitor, and an auxiliary circuit including first and second rectifiers in series with each other and with an electronic component configured to store electromagnetic energy. The electronic component has first and second terminals. A cathode of the first rectifier is connected with the passive clamp circuit, and an anode of the first rectifier is connected to the second terminal of electronic component. An anode of the second rectifier is connected with the cathode of the first rectifier, and a cathode of the second rectifier is connected with the first terminal of the electronic component.