Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1979-05-17
1981-04-21
Shoop, William M.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 56, H02H 1122
Patent
active
042636442
ABSTRACT:
A switched DC-to-DC converter in a power supply is powered by input line current from an external power source and driven by voltage pulses from a variable duty cycle pulse width modulator for converting a DC input voltage to a DC supply voltage of a different value that is applied to a load impedance. A comparator monitors the supply voltage for producing an error voltage that biases the modulator for adjusting the width of the voltage pulses, and thus the duty cycle of the converter, for maintaining the supply voltage relatively constant. An RC circuit integrates the voltage pulses for producing an indication of the average value thereof, which is directly related to the value of line current drawn by the converter. When the average value of voltage pulses exceeds a reference voltage, the value of bias voltage is limited for establishing the maximum width of voltage pulses and duty cycle of the converter, and thereby limit the maximum line current drawn by the power supply.
REFERENCES:
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patent: 3946301 (1976-03-01), Love
patent: 3950691 (1976-04-01), Ohba
patent: 4128866 (1978-12-01), Doerre
patent: 4196320 (1980-04-01), Townsend
patent: 4204266 (1980-05-01), Kammiller et al.
"Pulse-Width Modulated DC-to-DC Converter", S. E. Bigbie & R. W. Carlsten IBM Technical Disclosure Bulletin, vol. 19, No. 5, Oct. 1976, pp. 1530-1533.
"Packaged Pulse-Width Modulator Simplifies Series-Switching Regulator Design" John Sualbe, Electronics Design 19, Sep. 14, 1972, p. 162.
"Constant Period With Variable Duty Cycle Obtained From 555 With Single Control", Robert W. Hilshu, Electronics Design 14, Jul. 5, 1975, p. 72.
"DC-to-DC Converter Uses IC Timer", Robert Solomon and Robert Broadway, Electronic Design News, Sep. 5, 1973, pp. 87-91.
"Switching Supply Converts -60V to +5V and .+-.6.3V with 83% Efficiency", Philip M. Cowett, Electronic Design 2, Jan. 18, 1978, p. 106.
Cannon Russell A.
GTE Automatic Electric Laboratories Inc.
Shoop William M.
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