Title:
POWER SUPPLY DEVICE
Document Type and Number:
Japanese Patent JPH01148025
Kind Code:
A
Abstract:
PURPOSE:To feed output for putting AC together with DC, to a load, by offsetting the AC component of output generated from a transforming means, from common potential. CONSTITUTION:In a power supply device, the primary winding T1 side of a transformer T is provided with a PWM circuit and a driving circuit with a switching transistor and the like, and alternating current generated on its secondary winding T2 is rectified and smoothed by a diode 4 and a capacitor 5, and the output is generated. The capacitor 5 is series-connected to a capacitor 7, and a smoothing circuit is composed to earth one end of the capacitor 7. Besides, the output of the connecting point of the diode 4 and the transformer T is directed to a terminal 3 via a short-circuit-proof circuit with a filter consisting of resistors 21-22 and a capacitor 23, and a load is connected to the terminal. Then, alternating current and direct current are obtained, and by a circuit simplified more than that of putting the current amounts together with connection in series, current can be fed to the load.
Inventors:
TAKAHASHI KAZUYOSHI
Application Number:
JP30451287A
Publication Date:
June 09, 1989
Filing Date:
December 03, 1987
Export Citation:
Assignee:
CANON KK
International Classes:
H02J3/02; (IPC1-7): H02J3/02
Attorney, Agent or Firm:
Kato Taku