SWITCHING VOLTAGE REGULATOR

• US 3,790,879 A
• Filed: 11/12/1971
• Issued: 02/05/1974
• Est. Priority Date: 11/12/1971
• Status: Expired due to Term

• Current Assignee: Slavko Milovancevic
• Original Assignee: Slavko Milovancevic
• Inventors: Milovancevic, Slavko
• Primary Examiner(s): Goldberg, Gerald
• Application Number:
  US05/198,311
• Time in Patent Office: 816 Days
• Field of Search: 323/4,9,17,22T,22SC,23,24,25,38,DIG.1 321/16,45C,45S 307/240,248,252J,252M,296,297
• US Class Current: 323/284
• CPC Class Codes: H02M 3/1563 without using an external clock H02M3/158 takes precedence

Abstract

A switching voltage regulator for providing constant voltage to a load from an unregulated d-c source of any form, employing a series control transistor whose on and off state is controlled by a modified static switch either directly, or through a transistor driver stage. The modified static switch serves also the purpose of sensing the output voltage magnitude and initiating the conduction of said control transistor, when the same is supplied with an input d-c voltage.

Claims

1. A modified static switch used as switching control means and comprising first and second Silicon Controlled Rectifier (SCR) each respective SCR coupled to said common terminal by its cathode, a commutating capacitor connected between anodes of said SCR'"'"''"'"'s, each respective anode connected to a resistor, each resistor connected by its remaining end to an input terminal and to a (starting) starting capacitor having its other plate connected to the gate of said second SCR, and to a second SCR gate protective resistor connected between gate and cathode electrodes, a feedback resistor connected between anode and the gate of said second SCR, gate electrode of said first SCR being responsive to the signal applied between gate - cathode electrodes, and finally a connection from anode of said first SCR used as a shifting potential point convenient for control of other circuits (as in previous claims f.e.).

2. A switching voltage regulator circuit responsive to d-c input voltage and delivering regulated and filtered output voltage, comprising input terminal, common terminal, output terminal, transistor switch connected between said input and output terminals, a storage capacitor connected between said common and said output terminals, series connection of a fixed resistor connected to said common terminal and a variable resistor connected to said output terminal to sense the voltage across said storage capacitor, a protective resistor connected between said output terminal and the control electrode of said transistor switch, a current limiting resistor connected between said input terminal and said transistor switch, a protective diode connected by its cathode to said control electrode, a sensing resistor connected to the variable arm of said variable resistor, a modified static switch (indicated by the square designated 3 in FIG. 1) to sense the voltage across output terminals through said sensing resistor and to control the switching of said transistor switch through said protective diode, and comprising first and second Silicon Controlled Rectifier (SCR), each respective SCR having its cathode connected to said common terminal, a commutating capacitor connected between anodes of said SCR'"'"''"'"'s, each respective anode connected to a resistor, each resistor connected by its remaining end to said input terminal and to a starting capacitor, whose other plate is connected to the gate electrode of said second SCR and to a second SCR gate protective resistor connected between gate and cathode electrodes, a feedback resistor connected between anode and the gate of said second SCR, gate electrode of said first SCR being responsive to the signal applied between gate - cathode electrodes, and finally, anode electrode of said first SCR is connected to the anode electrode of said protective diode.

3. A switching voltage regulator circuit responsive to d-c input voltage and delivering regulated and filtered output voltage, comprising input terminal, common terminal, output terminal, a transistor switch connected to said input and output terminals, current limiting resistor connected between said input terminal and said transistor switch, storage capacitor connected to said common and output terminals, a fixed resistor connected to said common terminal and in series with a variable resistor coupled to said output terminal to sense output voltage, a protective resistor coupled to said transistor switch and said current limiting resistor junction, while its other end is connected to control electrode of said transistor switch, sensing resistor coupled to the arm of said variable resistor, voltage divider consisting of two resistors and coupled to said common and input terminals to provide voltage reference for emitter electrode of an n-p-n transitor, used to drive said transistor switch tHrough a collector resistor connected to its control electrode, a base current limiting resistor for said n-p-n transistor, with its other end coupled to a protective resistor (having remaining end connected to said common terminal) and to the cathode of a protective diode, whose anode is connected to a modified static switch (indicated by the square designated 3'"'"''"'"' in FIG. 2) to sense the voltage across output terminals through said sensing resistor, and to control the switching of said transistor switch through said protective diode, comprising first and second Silicon Controlled Rectifier (SCR), each respective SCR having its cathode connected to said common terminal, a commutating capacitor connected between anodes of said SCR'"'"''"'"'s, each respective anode connected to a resistor, each resistor coupled by its remaining end to said input terminal and to a starting capacitor, whose other plate is connected to the gate electrode of said second SCR and to a second SCR gate protective resistor connected between gate and cathode electrodes, a feedback resistor connected between anode and the gate of said second SCR, gate electrode of said first SCR being responsive to the signal applied between gate - cathode electrodes, and finally, anode electrode of said first SCR is connected to the anode electrode of said protective diode.