REGULATOR CIRCUIT - YOKOGAWA ELECTRIC WORKS LTD

Title:

REGULATOR CIRCUIT

Document Type and Number:

Japanese Patent JPS5762429

Kind Code:

A

Abstract:

PURPOSE:To reduce the loss of electric power at a series regulator by flowing a current from a DC/DC converter and the transformer of a switching regulator to the Zener diode of the series regulator. CONSTITUTION:The transformer T of a switching regulator 1 is provided with another winding n3; its one terminal is connected to the emitter of the transistor (TR)Q1 of a series regulator 2, and the other terminal is connected to a common point through the series circuit of a diode D1 and a capacitor C1. A current i2 flowing through a Zener diode ZD is one obtained by dividing a voltage, regulated by the Zener diode ZD, by a resistance R1, i.e., a current free from fluctuations of an input voltage VS. In addition, the value of the output voltage Vc(=Va+Vb) of a rectifying and smoothing circuit 3 may be greater than a Vz, so the Vs can rise up to a level higher than the Va approximately by the saturation voltage (about 0.2V) of the TRQ1, reducing the loss of a voltage at the series regulator 2 greatly.

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JPS5838411

[Title of the device] The protection circuit of a constant voltage power supply circuit

Inventors:

OKAMURI KENTA

Application Number:

JP13858980A

Publication Date:

April 15, 1982

Filing Date:

October 03, 1980

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