Electricity: battery or capacitor charging or discharging – Battery or cell charging – Pulsed
Patent
1997-01-15
1998-07-21
Tso, Edward
Electricity: battery or capacitor charging or discharging
Battery or cell charging
Pulsed
320158, 320145, H02J 704, H02J 716
Patent
active
057839301
ABSTRACT:
A self-oscillating buck mode battery charger apparatus 10. The apparatus 10 includes a main switching transistor 22, a first control transistor 34 and a second control transistor 36. The control transistors 34 and 36 are arranged such that neither control transistor sees the full input mains voltage across input terminals 12 of the apparatus 10 when the switching transistor 22 is turned off. An alternative embodiment of the invention includes a high and low main sensing circuit 102 in which a controller 120 is used to detect an excessively high mains voltage condition as well as an undesirably low mains voltage condition. The controller 120 turns off a PWM control circuit 104 when either condition is present for a predetermined length of time. Turning off the PWM control circuit 104 causes the main switching transistor 106 to be turned off, thereby preventing damage to the components of the charger apparatus 100. The charger apparatus is especially well-suited for applications where a rectified DC mains voltage is used to provide a charging current to a rechargeable battery.
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Albert Larry T.
Athari Frank Faez
Black & Decker Inc.
Tso Edward
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