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Title:
METHOD AND APPARATUS FOR CONTROLLING SWITCHING POWER SOURCE
Document Type and Number:
Japanese Patent JPH04109868
Kind Code:
A
Abstract:

PURPOSE: To eliminate a reduction in an input voltage controllable range due to high frequency by fixing a pulse frequency and a pulse width, and altering the number of pluses included for a predetermined time.

CONSTITUTION: N is calculated by using a logic circuit. That is, an output voltage and a reference output voltage are inputted to a differential amplifier to obtain a differential voltage between both, it is input to a V/f converter to be converted into a frequency as a gate to obtain the N by counting clocks 1MHz. In this case, since the converter receives only a positive voltage, an input is so switched that the output of a differential amplifier always becomes positive by using the output of a digital comparator. Actually, in order to calculate the N, a binary counter output is shifted by 6 digits to obtain it. A gate 2 pulses are formed by a 1/(N+1) frequency divider and a gate 1 pulse as a clock pulse by using the N output, and further inverted to form a gate 3 pulse.


Inventors:
Sato, Shun
Murasato, Michihisa
Yamashita, Satoshi
Yamamoto, Takaaki
Application Number:
JP1990000226039
Publication Date:
April 10, 1992
Filing Date:
August 28, 1990
Export Citation:
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Assignee:
NIPPON STEEL CORP
International Classes:
H02M3/155; H02M3/28; (IPC1-7): H02M3/155; H02M3/28



 
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