Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1996-11-27
1998-12-08
Riley, Shawn
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
320140, H02M 3335
Patent
active
058479406
ABSTRACT:
In a self-oscillating power-supply circuit for charging a battery (B) the switching transistor (T2) is turned off if the voltage across the sensing resistor (R3) exceeds the threshold voltage of a zener diode (D5). Instead of the zener diode (D5) it is possible to use a switching transistor which is actuated when the current through the switching transistor exceeds a given value. A diode (D6) is arranged in series with the zener diode (D5) 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 may be added to monitor the battery voltage and to eliminate the short-circuit of the diode (D6) when a given battery voltage is reached, as a result of which the power-supply circuit changes over to slow charging. A cascode transistor (T1) reduces the dissipation of the switching transistor (T2), protects the switching transistor (T2) against overvoltage and stabilizes the voltage on the supply terminal (N3) to which the starting resistor (R6) is connected. This allows an accurate dosing of the current during slow charging.
REFERENCES:
patent: 4652984 (1987-03-01), van der Akker et al.
patent: 4684871 (1987-08-01), Plagge
patent: 4965506 (1990-10-01), Algra et al.
Faller F. Brice
Riley Shawn
U.S. Philips Corporation
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