Power supply having substantially constant output during load switching

• US 3,889,177 A
• Filed: 09/24/1973
• Issued: 06/10/1975
• Est. Priority Date: 06/15/1972
• Status: Expired due to Term

• Current Assignee: Charles Nelson Jr. Fendrich
• Original Assignee: Charles Nelson Jr. Fendrich
• Inventors: Fendrich, Charles Nelson Jr.
• Primary Examiner(s): Pellinen, A. D.
• Application Number:
  US05/400,436
• Time in Patent Office: 624 Days
• Field of Search: 321/2,4,14,18,19,27R 323/17,19,20,22T,22SC,23,25,DIG.1
• US Class Current: 323/266
• CPC Class Codes: H02M 3/33569 having several active switching elements H02M3/3353 takes precedence

Abstract

A power supply capable of maintaining substantially constant output when switching from no load to full load condition using a set of series capacitors which provide the required output voltage during switching.

Claims

1. A power supply comprising an input source of unregulated D.C. voltage, means coupling the input source to an output including, switching means between the input source and the output, a source of regularly recurrent pulses, means responsive to said pulses for rendering the switching means operative to connect the input source to the output for a time depending on the width of each pulse, said source of regularly recurrent pulses being jointly responsive to the instantaneous voltage amplitude of the input source and the voltage amplitude at the output for adjusting the width of the pulses for regulating the output voltage, wherein the source of regularly recurrent pulses includes a sawtooth waveform generator with the slope of the waves dependent on the instantaneous voltage of the input, means for sensing the voltage at the output, means for providing an error voltage having an amplitude dependent upon variations from a predetermined voltage at the output, and means for comparing the sawtooth waves with the error voltage to produce said regularly recurrent pulses, wherein the means coupling the input source to the output comprises a plurality of driven voltage converters with their inputs connected in parallel to the switching means and their outputs connected in series voltage adding relation, a source of oscillations, and means controlled by said source of oscillations for driving said converters in synchronism.

2. A power supply according to claim 1 including means for synchronizing the sawtooth waveform generator with the source of oscillations.

3. A power supply according to claim 2, including means responsive to a voltage greater than a predetermined amplitude applied to the converter means for rendering said switching means inoperative.

4. A power supply according to claim 1, including means responsive to a voltage greater than a predetermined amplitude applied to the converter means for rendering said switching inoperative.

5. A power supply comprising an input source of unregulated D.C. voltage, means coupling the input source to a load having an output including, switching means between the input source and the output, a source of regularly recurrent pulses, means responsive to said pulses for rendering the switching means operative to connect the input source to the output for a time depending on the width of each pulse, said source of regularly recurrent pulses being jointly responsive to the instantaneous voltage amplitude of the input source and the voltage amplitude at the output for adjusting the width of the pulses for regulating the output voltage, the means coupling the input source to the output comprises a plurality of driven voltage converterS with their inputs connected in parallel to the switching means and their outputs connected in series voltage adding relation, a source of oscillations, and means controlled by said source of oscillations for driving said converters in synchronism.

6. A power supply according to claim 5 including means responsive to a voltage greater than a predetermined amplitude applied to the converter means for rendering said switching means inoperative.