Power-supply circuit

Details Power-supply circuit Power-supply circuit

H - Electricity

02

M

323/4

H02M 3/156 (2006.01) H02M 7/217 (2006.01)

Patent

CA 1271220

ABSTRACT: " Power-supply circuit". In order to maintain the voltage across a first capacitor (C1) for energizing a motor (M) substantially constant over a wide range of mains voltages, this capa- citor (C1) is charged during the rising edges of the ap- plied mains voltage in that above a specific input voltage (Umin) a first transistor (T1) is turned on via a second capacitor (C2) and a first resistor (R2). When the mains voltabe rectified by a diode (D1) exceeds a specific value (U2) defined by a first zener diode (Z2) a second transis- tor (T2) is turned on and, consequently, the first tran- sistor (T1) is turned off. When the first transistor (T1) is cut off the first capacitor (C1) is discharged through the motor (M). The second capacitor (C2) is then dis- charged via a second zener diode (Z1) and prevents the first transistor (T1) from being turned on.

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