Switching regulator power supply

Claim 2

A regulated power supply circuit of varied input and constant output capability which comprises: a. a full-wave rectifier to produce DC output voltages from input voltages of varied magnitude and frequency; b. a blocking oscillator containing an oscillating transistor connected to said rectifier; c. a toroidal transformer connected to said oscillator to store output energy from said oscillator; d. a rectifier and a capacitor connected to a secondary winding of said transformer to charge said capacitor in dependence upon the turns of secondary winding and the repetition rate of said oscillator to provide an output voltage across said capacitor; e. feedback means including first and second signal transistors coupled to a winding of said transformer for turning said oscillator on and off to maintain said output voltage at a predetermined level; said feedback means further includes: f. a first diode whose anode is connected in series to the top terminal of said winding and whose cathode is connected to the emitter of said first signal transistor; g. a first resistor connected to the base of said first signal transistor and to the cathode of said first diode; h. a first capacitor connected in parallel with said resistor; i. a second capacitor whose first terminal is connected to the emitter of said first signal transistor and which is connected in parallel to the serial circuit of said first diode and said winding; j. a Zener diode whose cathode is connected to the base of said first signal transistor; k. a second diode whose anode is connected to the anode of said Zener diode; l. a third diode whose anode is connected to the cathode of said second diode and whose cathode is connected to the emitter of said second signal transistor, to the second terminal of said second capacitor, and to the bottom terminal of said winding; m. a second resistor connected to the collector of said first signal transistor, and to the base of said second signal transistor; n. a third resistor connected to the base and the emitter of said second signal transistor; o. a third capacitor connected in parallel to said third resistor, and across the base-emitter junction of said second signal transistor; p. and a common connection of the collector of said second signal transistor with the base of the oscillating transistor of said blocking oscillator.

Claim 3

The combination set forth in claim 1 wherein a plurality of secondary windings on said transformer and a plurality of rectifier-capacitor combinations provide a plurality of output voltages.

Claim 4

In a regulated power supply adapted to accept inputs from power lines of various frequencies and voltage amplitudes, and to provide a constant output voltage level, the combination which comprises: a. a full-wave bridge rectifier to produce DC output voltages from input voltages of varied magnitude and frequency; b. a transformer which stores input energy from said rectifier with one of a plurality of secondary windings connected to deliver energy to an output load; c. a blocking oscillator, connected at its collector current path to a transformer primary winding and in its control current path with one of said secondary windings, to control the storage of input energy in said transformer for depletion through said one of said secondary windings to said load; d. a rectifier-output capacitor combination coupled to said one of said secondary windings to provide an output voltage across said load; e. a two signal transistor feedback means coupled to a secondary winding of said transformer and connected to the control path of said blocking oscillator to controL the conduction periods of said oscillator and maintain said output voltages at predetermined levels; f. said blocking oscillator including a power transistor whose collector is connected through a primary coil of said transformer to the positive output node of said full-wave rectifier, whose emitter is connected to the emitter of the output signal transistor of said feedback means and inductively coupled to the negative output node of said rectifier, and whose base is resistively coupled through a winding of said transformer to the positive output node of said rectifier and connected to the collector of the output signal transistor of said feedback means; g. said feedback means including a series circuit of a diode connected to a terminal of a feedback winding of said transformer of instantaneous polarity opposite the polarity of said one of said secondary windings, with the cathode of said diode connected to the emitter of an input signal transistor, and the second terminal of said feedback winding is connected to the emitter of an output signal transistor whose base is resistively coupled to the collector of said input signal transistor; h. a reference voltage circuit including a Zener diode cathode connected to the base of said input signal transistor and anode coupled to the emitter of said output signal transistor; i. a capacitor, with one terminal connected to the emitter of said input signal transistor of said feedback means and the other terminal connected to the emitter of said output signal transistor, to serve as a feedback reference voltage source equal to the voltage across the emitter-base junction of said input signal transistor plus the voltage across said reference voltage circuit; and j. means to couple said rectifier-output capacitor combination to said transformer for reverse bias of the rectifier therein when said blocking oscillator is in a charge cycle, and to charge the output capacitor when said blocking oscillator is not in a charge cycle.

Claim 5

In a regulated power supply adapted to accept inputs from power lines of various frequencies and voltage amplitudes, and to provide a constant output voltage level, the combination which comprises: a. a full-wave bridge rectifier to produce DC output voltages from input voltages of varied magnitude and frequency; b. a transformer which stores input energy from said rectifier with one of a plurality of secondary windings connected to deliver energy to an output load; c. a blocking oscillator, connected at its collector current path to a transformer primary winding and in its control current path with one of said secondary windings, to control the storage of input energy in said transformer for depletion through said one of said secondary windings to said load; d. a rectifier-output capacitor combination coupled to said one of said secondary windings to provide an output voltage across said load; e. a two signal transistor feedback means coupled to a secondary winding of said transformer and connected to the control path of said blocking oscillator to controL the conduction periods of said oscillator and maintain said output voltages at predetermined levels; f. said blocking oscillator including a power transistor whose collector is connected through a primary coil of said transformer to the positive output node of said full-wave rectifier, whose emitter is connected to the emitter of the output signal transistor of said feedback means and inductively coupled to the negative output node of said rectifier, and whose base is resistively coupled through a winding of said transformer to the positive output node of said rectifier and connected to the collector of the output signal transistor of said feedback means; g. said feedback means including a series circuit of a diode connected to a terminal of a feedback winding of said transformer of instantaneous polarity opposite the polarity of said one of said secondary windings, with the cathode of said diode connected to the emitter of an input signal transistor, and the second terminal of said feedback winding is connected to the emitter of an output signal transistor whose base is resistively coupled to the collector of said input signal transistor; h. a reference voltage circuit including a Zener diode cathode connected to the base of said input signal transistor and anode coupled to the emitter of said output signal transistor; i. a capacitor, with one terminal connected to the emitter of said input signal transistor of said feedback means and the other terminal connected to the emitter of said output signal transistor, to serve as a feedback reference voltage source equal to the voltage across the emitter-base junction of said input signal transistor plus the voltage across said reference voltage circuit; and j. means to couple said rectifier-output capacitor combination to said transformer for reverse bias of the rectifier therein when said blocking oscillator is in a charge cycle, and to charge the output capacitor when said blocking oscillator is not in a charge cycle.