Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Low Frequency Switching Power Supply

IP.com Disclosure Number: IPCOM000081484D
Original Publication Date: 1974-Jun-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Gobson, LL: AUTHOR [+2]

Abstract

Fig. 1 illustrates the basic configuration of a low-frequency switching power supply. The primary of the transformer 10 is driven by an AC voltage. A current limited switch 12 connects the rectified secondary voltage to the filter capacitor CF and to the load RL. The current limited switch 12 is driven by a control signal, derived from voltage feedback by conventional means. Capacitor C1 provides transient voltage suppression only.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Low Frequency Switching Power Supply

Fig. 1 illustrates the basic configuration of a low-frequency switching power supply. The primary of the transformer 10 is driven by an AC voltage. A current limited switch 12 connects the rectified secondary voltage to the filter capacitor CF and to the load RL. The current limited switch 12 is driven by a control signal, derived from voltage feedback by conventional means. Capacitor C1 provides transient voltage suppression only.

Figs. 2 and 3 illustrate the operation of the power supply. During each half cycle of the AC voltage, the current limited switch 12 is turned on and the output voltage increases until a detect level VT is reached. The switch is then turned off and stays off until the next half cycle of the AC voltage. If low ripple is desired, the ripple voltage on the output can be made very small by making CF a very large capacitance. The limit current for the current limited switch 12 is chosen so as to optimize efficiency of the supply.

1

Page 2 of 2

2

[This page contains 1 picture or other non-text object]