Power supply device

H - Electricity – 02 – M

Patent

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Details

H02M 3/28 (2006.01) H02M 3/335 (2006.01) H02M 3/338 (2006.01)

Patent

CA 2220736

The invention relates to a power supply device for a small-sized electronic appliance, and is intended to realize a reliable power supply device at low cost. To achieve the object, a primary side coil (34) of a switching transformer and a switching element (35) are connected in series to both ends of an input power source (31), a series circuit of a resistance (32) and a capacitor (33) is connected to the input power source (31), the junction of the resistance (32) and capacitor (33) is connected to one end of a control winding (37) of the switching transformer, other end of the control winding (37) of the switching transformer is connected to a control terminal of the switching element (35), and a discharge circuit (40) driven by a signal of the control winding (37) of the switching transformer is used as means for discharging said capacitor (33), and therefore the conventional high withstand voltage diode is not necessary, reverse leak current is prevented, so that a highly reliable power supply device may be realized.

L'invention se rapporte à une alimentation électrique extrêmement fiable et bon marché, destinée à de petits dispositifs électroniques, dans lesquels on n'utilise plus les diodes habituelles pour tensions de maintien élevées, ce qui permet de prévenir les courants de fuite à polarisation inverse. Un circuit monté en série d'un enroulement primaire latéral (34) d'un transformateur de commutation et d'un élément de commutation (35) est connecté entre les extrémités d'une source de courant d'entrée (31), et un circuit monté en série constitué d'une résistance (32) et d'un condensateur (33) est également connecté entre les extrémités de la source de courant (31). Le point de connexion entre la résistance (32) et le condensateur (33) est raccordé à une extrémité de l'enroulement de commande (37) du transformateur de commutation et l'autre extrémité de l'enroulement (37) du transformateur est connectée à la borne de commande de l'élément de commutation (35). Un circuit de décharge (40) commandé par des signaux provenant de l'enroulement de commande (37) du transformateur est utilisé comme organe de décharge du condensateur (33).

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