A High-Power-Factor Dimmable LED Driver with Integrated Boost Converter and Half-Bridge-Topology Converter

A High-Power-Factor Dimmable LED Driver with Integrated Boost Converter and Half-Bridge-Topology Converter

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depileve easy clean This paper proposes a dimmable light-emitting diode (LED) driver featuring a high power factor and zero-voltage switching on (ZVS).The circuit is obtained by integrating a boost converter and a dc-dc converter with half-bridge topology.The high power factor is achieved by operating the boost converter in discontinuous current mode (DCM).

The LEDs are dimmed by the control scheme of asymmetrical pulse-width modulation (ASPWM).The developed circuit eliminates the inherited dc-offset current of the transformer in a conventional asymmetrical half-bridge converter by introducing a balance capacitor.Both active switches can operate at ZVS by freewheeling the boost feline 1-hcpch vaccine inductor current and the transformer magnetizing current to discharge the energy stored in their parasitic capacitance.

The circuit operation is analyzed in detailed, and mathematical equations are derived.Finally, a 115-W prototype circuit for driving high brightness LEDs was built and tested.The experimental results verify the feasibility of the proposed LED driver with satisfactory performance.

It can achieve a high power factor and ZVS operation.