Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1996-11-27
1998-12-22
Nappi, Robert E.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 19, 363 21, 320130, H02M 3335, H02J 704
Patent
active
058525491
ABSTRACT:
In a self-oscillating power-supply circuit for charging a battery, a switching transistor (T2) is turned off if the voltage across a sensing resistor (R3) exceeds the threshold voltage of a zener diode (D5). The zener diode is arranged in parallel with the series arrangement of the base-emitter junction of the switching transistor and the sensing resistor, so that the voltage of the battery does not influence the peak current at which the switching transistor is turned off. A diode (D6) is arranged in series with the zener diode and can be short-circuited by means of a switch (T3) in order to switch the power-supply circuit from slow charging to rapid charging. A voltage sensor (R8, R9, T4) monitors the battery voltage and eliminates the short-circuit of the diode (D6) when a given battery voltage is reached so that the power-supply circuit changes over to slow charging. A cascode transistor (T1) protects the switching transistor against overvoltage and stabilizes the voltage on the supply terminal (N3) to which a starting resistor (R6) is connected. This allows an accurate dosing of the current during slow charging.
REFERENCES:
patent: 4378585 (1983-03-01), Bete
patent: 4464619 (1984-08-01), Schwarz et al.
patent: 4523139 (1985-06-01), Schwarz et al.
patent: 4585988 (1986-04-01), Nakai
patent: 4652984 (1987-03-01), Van Der Akker et al.
patent: 4965506 (1990-10-01), Algra et al.
patent: 5479330 (1995-12-01), Bergk
Franzblau Bernard
Nappi Robert E.
Patel Rajnikant B.
U.S. Philips Corporation
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