Browse Prior Art Database

Multivibrator Power Supply

IP.com Disclosure Number: IPCOM000098192D
Original Publication Date: 1960-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 3 page(s) / 46K

Publishing Venue

IBM

Related People

Hakimoglu, A: AUTHOR

Abstract

A regulated power supply is provided using a magnetic multivibrator having a flux reset control winding energized in accordance with an error voltage between a reference voltage and a portion of the load voltage. Transistors switch the D. C. input and produce a square wave output, the reset half cycle being controlled as to duration and the rectified portion having a variable average value in accordance therewith.

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Multivibrator Power Supply

A regulated power supply is provided using a magnetic multivibrator having a flux reset control winding energized in accordance with an error voltage between a reference voltage and a portion of the load voltage. Transistors switch the D.
C. input and produce a square wave output, the reset half cycle being controlled as to duration and the rectified portion having a variable average value in accordance therewith.

The magnetic amplifier 10 comprises a core 11 of substantially rectangular hysteresis loop material bearing windings N1, N2, N3, N4 and Nc. N1 is connected to provide for saturating or setting flux in the core 11 in a positive direction. N2 is connected in the opposite sense to provide reset of the magnetic flux in core 11. N4 is connected to provide base current for driving the transistor TR 1 to saturation during the power half cycle flux setting time of the core 11. The output N3 is connected for applying positive output pulses to a load circuit across which is connected a load bleeder resistor RL. Control winding Nc is connected to permit the flow of current through it during reset of the core 11. Control of the reset time is effected by connecting a transistor TR 2 across Nc through emitter and collector resistors 15 and 16 which together serve to limit the maximum control current.

The filter circuit 12 comprises a choke L connected in series with N3 and the load circuit and a shunt filter capacitor Cf. A diode Df is connected across the input side of the L to provide for supplying a current to the choke during the control or reset half cycle.

The error detector circuit 13 comprises a voltage divider, including a resistor 21 and an adjustable resistor 22, connected across the load circuit. A Zener diode Z, connected across the load circuit in series with a resistor 23, provides a substantially fixed reference source. The emitter and base of the error detector transist...