Battery charger with monitor and protection circuits

Details Battery charger with monitor and protection circuits Battery charger with monitor and protection circuits

1998-07-01

2000-03-14

Tso, Edward H.

Electricity: battery or capacitor charging or discharging

One cell or battery charges another

Vehicle battery charging

320134, H01M 1046, H01M 1044

Patent

active

060377453

ABSTRACT:
A charging apparatus for charging batteries of automobiles includes an inverter for converting the direct current from a direct current power source into an alternating current and a transformer having a first coil and a second coil. When an alternating current from the inverter is applied to the first coil, the second coil produces an alternating voltage. A capacitor is connected between the terminals of the second coil to increase the alternating voltage produced in the second coil. A rectifier circuit rectifies the alternating voltage increased in the booster circuit into a direct current voltage and the direct current voltage is applied to the battery. Two transistors, which function as a short circuit, are provided in the rectifier circuit. When the direct current voltage from the rectifier circuit is equal to or higher than a predetermined permissible value, a drive signal from a drive circuit turns on the two transistors. Then, the terminals of the second coil are short-circuited and the voltage applied to the terminals instantaneously turns null. This protects the elements forming the charging apparatus from high voltage.

REFERENCES:
patent: 4742290 (1988-05-01), Sutphin et al.
patent: 5157319 (1992-10-01), Klontz et al.
patent: 5568036 (1996-10-01), Hulsey et al.
SAE International, "Electric Vehicle Inductive Coupling Recommended Practice," from handbook entitled SAE Ground Vehicle Standards Index, Feb. 1, 1995, pages cover, index and 1-28.

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