Patent ID: 6850047
Filing Date: 2005-02-01
Classification: H02M,Y10S

Abstract:
1. A switching regulator for supplying an electrical load with a constant voltage which comprises: switching means inserted into a current route between an external voltage source and said electric load; smoothing means for smoothing an output from said switching means; control signal generating means for generating a PWM signal for switching said switching means, in such a manner that an output from said smoothing means are kept constant; rush current preventing means, in order to prevent a rush current from flowing in said current route, for generating a suppress control signal for suppressing a duty of said PWM signal within a prescribed duty during a prescribed time period, if a prescribed point voltage at a prescribed point on said current route after said switching regulator was turned on ascends and crosses over a prescribed ascending reference which is fixed lower than said prescribed point voltage; and recovering means for operating again said rush current preventing means even after once completing its operation, if said prescribed point voltage descends and crosses down a prescribed descending reference which is fixed lower than said prescribed ascending reference.