Pulse width modulated dc-to-dc boost converter

Details Pulse width modulated dc-to-dc boost converter Pulse width modulated dc-to-dc boost converter

H - Electricity

02

M

H02M 3/155 (2006.01) H02M 3/158 (2006.01) H03K 17/0814 (2006.01)

Patent

CA 2169160

A pulse width modulated DC-to-DC boost converter circuit (300) in which switching losses are minimized. The circuit operates at a constant frequency and in continuous mode (at a constant current). Turn-on losses are minimized by causing the parasitic intrinsic capacitance of the main switching device (302) to be discharged before the switching device is switched to the conducting state, and reducing reverse recovery current from the output rectifier (320) of the circuit when the output rectifier turns off. Turn-off losses in the switching device are minimized by causing a condition of zero volts across the switching device at turn-off.

Circuit (300) de convertisseur élévateur de tension continu/continu à modulation de largeur d'impulsions dans lequel les pertes de commutation sont réduites au minimum. Le circuit fonctionne à une fréquence constante et en mode continu (à un courant constant). On réduit au minimum les pertes à l'allumage en provoquant la décharge de la capacité intrinsèque parasite du dispositif de commutation principal (302) avant que ce dernier soit commuté à l'état conducteur, et en réduisant le courant de recouvrement inverse provenant du redresseur de sortie (320) du circuit lorsque ce dernier est mis hors tension. On réduit au minimum les pertes de mise hors tension dans le dispositif de commutation en créant une situation de tension nulle dans le dispositif de commutation lors de la mise hors tension.

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