Browse Prior Art Database

Single SCR High Frequency Regulated DC Power Supply

IP.com Disclosure Number: IPCOM000076119D
Original Publication Date: 1972-Jan-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Kiankhooy Fard, P: AUTHOR

Abstract

When the silicon-controlled rectifier SCR is triggered, a current is established in L1 which is exponential and depends on L1, resistor R, its initial current, and duration of the time the input Ein between node A and G is connected to node B. Also, a sinusoidal current is established in L2 which depends on L2, C2, the initial current, the initial voltage of C, and the duration of the time the input Ein is again connected to node B.

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 76% of the total text.

Page 1 of 2

Single SCR High Frequency Regulated DC Power Supply

When the silicon-controlled rectifier SCR is triggered, a current is established in L1 which is exponential and depends on L1, resistor R, its initial current, and duration of the time the input Ein between node A and G is connected to node B. Also, a sinusoidal current is established in L2 which depends on L2, C2, the initial current, the initial voltage of C, and the duration of the time the input Ein is again connected to node B.

The current L2 turns off the SCR and the diode D1. When both are turned off, L1 and L2 are in series and their currents are the same. This current is sinusoidal with a larger time constant and discharges the capacitor C, thus changing its polarity.

The SCR is triggered again and the above is repeated.

As the triggering frequency increases, the current through L1 increases and forces C to a higher reverse polarity. Therefore, as the frequency increases, the commutating current increases. This increase in the current causes higher voltage across L2, C2 and node B-G. Thus, by affecting the triggering frequency of the SCR, the current through L2 can be regulated.

The supply can be operated with and without the diode D1.

There are three different ways to connect the primary of the transformer. In all three ways, the average of (volts X seconds) at the transformer primary is zero to cause triggering of the SCR.

The primary of the transformer can be connected across L2 or across C2 or acros...