A soft switched pwm ac to dc converter with gate array logic...

H - Electricity – 02 – M

Patent

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H02M 1/00 (2006.01)

Patent

CA 2216889

A soft switched PWM AC to DC power converter for a DC power supply is disclosed. The power supply includes a power factor corrector (PFC) converter with a power boost topology, a DC/DC converter with a forward topology and a fly-back converter which serves as an auxiliary power supply for the controller components. The three converters are synchronized by a gate array logic (GAL) IC to minimize EMI noise. The GAL also conditions the PWM for the PFC and the DC/DC converter to provide very precise switching control. Synchronizing and PWM timing signals are derived by the GAL using a high-speed clock signal that is input to the GAL as a data input. The clock signal is repeatedly divided using synchronous division to yield a digital monostable timing signal that enables very precise control of converter switches.

Convertisseur d'alimentation c.a./c.c. MID (modulation d'impulsions en durée) à commutation graduelle pour alimentation c.c. L'alimentation comprend un convertisseur de correcteur de facteur de puissance (PFC) à topologie d'élévation de puissance, un convertisseur c.c./c.c. à topologie directe et un convertisseur indirect servant d'alimentation auxiliaire pour les composants du contrôleur. Les trois convertisseurs sont synchronisés par un CI à réseau de portes logiques (GAL) afin de réduire le bruit de brouillage électromagnétique. En outre, le GAL conditionne la MID pour le convertisseur de PFC et le convertisseur c.c./c.c. afin d'assurer une commande de commutation très précise. Les signaux de synchronisation et de temporisation MID sont extraits du GAL au moyen d'un signal d'horloge à grande vitesse transmis au GAL sous forme de données. Le signal d'horloge est divisé à plusieurs reprises par division synchrone afin d'obtenir un signal de temporisation monostable permettant une commande très précise de commutateurs de convertisseurs.

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