Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1979-06-22
1982-01-19
Shoop, William M.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
323289, 307280, 307300, H02M 3335
Patent
active
043120296
ABSTRACT:
The base electrode of the switching transistor in a converter is resistively connected to the output terminal of a pulse width modulator and connected through first and second series connected diodes to a ground reference potential which is also connected to the emitter of the transistor, the junction between the diodes being electrically connected through a large capacitor to the modulator output terminal. Voltage pulses at the output terminal cause the transistor to pass collector current and the second diode to conduct for charging the capacitor. On termination of voltage pulses, the modulator connects the output terminal thereof to ground. This causes the charge voltage on the capacitor to turn the first diode on to pull the base voltage sharply negative for rapidly drawing minority carriers out of the base region. This allows the base-emitter interelectrode capacitance of the switching transistor to discharge sooner for rapidly reducing the flow of collector current and decreasing power dissipation in the transistor during turnoff thereof.
REFERENCES:
patent: 3569792 (1971-03-01), Schroeder
patent: 3600666 (1971-08-01), Gliever
patent: 3697852 (1972-10-01), Gerbitz
patent: 3736495 (1973-05-01), Calkin et al.
patent: 3742242 (1973-06-01), Morio et al.
John Svalbe, "Packaged Pulse Width Modulator Simplifies Series Switching Regulator Design", Electronic Design 19, Sep., 14, 1972, p. 172. _
R. W. Hilsher, "Constant Period with Variable Duty Cycle Obtained from 555 Timer with Single Control", Electronic Design 14, Jul. 5, 1975, p. 72.
R. Solomon et al., "DC-DC Converter Using IC Timer", Electronic Design News, Sep. 5, 1973, pp. 87-91.
P. W. Cowett, Jr., "Switching Supply Converts -60 Volt to +5 V and .+-.6.3 V with 83% Efficiency", Electronic Design 2, Jan. 18, 1978, p. 106.
Cannon Russell A.
GTE Automatic Electric Laboratories Inc.
Shoop William M.
Wong Peter S.
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