Abstract: A power supply circuit of switching regulator type includes a converter transformer defined by a first winding for receiving input power from a DC source and second winding for producing output power, a switching transistor for alternately making and breaking electric connection between the DC source and the first winding by alternate turn on and off operations of the switching transistor, and a rectifying circuit connected to the second winding for rectifying the output power. A power supply circuit further includes a first error detector for detecting a drift in the rectified output DC current and for producing a first control signal, a second error detector for detecting a drift in the rectified output DC voltage and for producing a second control signal, and a controller for controlling the on and off operations of the switching transistor based on either one of the first control signal and the second control signal so as to stabilize the rectified output power.

Abstract: A power supply circuit of switching regulator type includes a converter transformer defined by a first winding for receiving input power from a DC source and second winding for producing output power. A switching transistor is connected to the first winding for alternately making and breaking electric connection between the DC source and the first winding by alternate turn on and off operations of the switching transistor, and a rectifier is connected to the second winding for rectifying the output power. A first detector is provided for detecting the rectified output DC voltage during off-period of the switching transistor and for producing an output-voltage signal representing the output DC voltage. A power supply circuit further includes a second detector for detecting the input DC voltage during on-period of the switching transistor and for producing an input-voltage signal representing the input DC voltage.

Abstract: A power supply circuit comprises a converter transformer and a switching transistor. The input winding of the transformer, the collector and emitter of the transistor, and a collector-emitter current detecting resistor are connected in series, while the base of the transistor is connected through a starting resistor to a direct current input and is also connected to one end of the feedback winding of the transformer. A turning off capacitor and a diode are connected in series between both ends of the feedback winding, whereby the capacitor is charged on the occasion of non-conduction of the transistor. A switching element of two transistors as cascade connected is connected directly or through the above described resistor between one end of the capacitor and the emitter of the transistor.