Title :
On the minimization of switching losses in DC-DC boost converters
Author :
Salazar, L.D. ; Ziogas, P.D. ; Joos, G.
Author_Institution :
Dept. of Electr. & Comput. Eng., Concordia Univ., Montreal, Que., Canada
Abstract :
A high-frequency snubber circuit is proposed for a zero-voltage-switched (ZVS) single-switch pulse-width-modulated (PWM) boost converter. It is shown to be effective in reducing switching losses during turn-off in high-voltage applications. The lossless snubber subcircuit consists of an LC resonant circuit and two diodes. The resonant capacitor of this LC circuit is parallel with the switch and discharges directly through the load, thus providing lossless switching and increasing the input-output DC gain of the converter. Experimental verification has shown a better efficiency (5% higher at 2 kW output power) and an increased output-input DC gain (15% to 20%) compared with a similar standard boost converter with a diode-resistance-capacitor (DRC) snubber circuit. No extra switch or special resistor is required to remove the energy of the snubber capacitor
Keywords :
losses; overvoltage protection; power convertors; pulse width modulation; switching; 2 kW; 20 kHz; DC-DC boost converters; LC resonant circuit; PWM; diode-resistance-capacitor; diodes; high-frequency snubber circuit; high-voltage; input-output DC gain; lossless switching; output-input DC gain; single-switch pulse-width-modulated; switching losses minimisation; turn-off; zero-voltage-switched; DC-DC power converters; Diodes; Minimization; Pulse width modulation converters; RLC circuits; Snubbers; Switches; Switching circuits; Switching converters; Switching loss;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 1992. APEC '92. Conference Proceedings 1992., Seventh Annual
Conference_Location :
Boston, MA
Print_ISBN :
0-7803-0485-3
DOI :
10.1109/APEC.1992.228344
