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A more accurate steady state analysis of the zero-voltage switching quasi-resonant (ZVSQR) converter is conducted in this paper. The conversion ratio equation and the conditions to achieve zero-voltage switching (ZVS) are derived. According to the analysis, a ZVSQR converter can be designed to operate within a wider input voltage range. A ZVSQR inverted buck converter is simulated as an example to...
This brief presents a monolithic high-voltage light-emitting diode (LED) driver for lighting applications. The LED driver is able to operate at high switching frequency because large switching loss is eliminated by zero-voltage switching. Inductor values are therefore reduced. A constant-duty-ratio frequency regulator (CDFR) is proposed to regulate the LED current, and the small signal characteristics...
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