Title:
POWER SUPPLY
Document Type and Number:
Japanese Patent JPS5833730
Kind Code:
A
Abstract:
PURPOSE:To improve the efficiency and stability and to attain small sized power supply, by making use of merits of a switching power supply and a series dropper power supply and compensating demerits of them through combination. CONSTITUTION:An error detection circuit 25 detects a voltage difference between a reference voltage terminal 28 and an error detecting terminal 9 connected to an output 17. A voltage of a base 18 of a transistor (TR)3 is changed in response to this error voltage and the base bias voltage of the TR3 is controlled so that the error voltage is about zero. In a switching power supply 1, the switching operation of a switching circuit 19 is controlled via a modulation circuit 20 so that an error voltage detected at an error detection circuit 23 is about zero, in other words, an output terminal 4 and a reference voltage terminal 7 have almost the same voltage. The output terminal 4 and the base 18 of the Tr are kept to almost the same voltage.
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Inventors:
YOSHINO RIYOUZOU
YAMAGA MITSUHIRO
YAMAGIWA AKIRA
MATSUMOTO TAKASHI
USAMI NAGATOSHI
YAMAGA MITSUHIRO
YAMAGIWA AKIRA
MATSUMOTO TAKASHI
USAMI NAGATOSHI
Application Number:
JP13120981A
Publication Date:
February 28, 1983
Filing Date:
August 21, 1981
Export Citation:
Assignee:
HITACHI LTD
International Classes:
G05F1/56; H02M3/155; H02M3/28; (IPC1-7): G05F1/56; G05F1/64
Domestic Patent References:
| JPS5790726A | 1982-06-05 |
Attorney, Agent or Firm:
Makoto Suzuki