Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1984-06-13
1986-01-07
Wong, Peter S.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 2, 320 40, H02J 700
Patent
active
045636273
ABSTRACT:
There is disclosed herein a rechargeable battery pack for use with electronic devices, such as electronic flash units used in photography, and wherein the battery pack has a pair of exposed electrical terminals. At least one of the terminals is constructed in the form of a switch such that when the battery pack is removed from its case, the terminal will assume a switched state so as to eliminate any electrical shock hazard. The battery pack comprises rechargeable batteries, a DC/DC converter for converting the relatively low voltage of the rechargeable batteries to the relatively high output voltage of the battery pack, and includes a voltage monitor and limiting circuit which provides voltage regulation and provides a low battery voltage limit during discharge of the rechargeable batteries. In a preferred embodiment, a rechargeable battery pack for providing an output of approximately 330-360 volts DC is illustrated and wherein the positive output terminal of the battery pack is connected to the negative terminal thereof through a relatively large discharge resistance to both shunt the high voltage output terminals and to turn off the voltage converter to thereby eliminate any electrical shock hazard and to provide a very slow discharge of the rechargeable batteries of the battery pack.
REFERENCES:
patent: 4191917 (1980-03-01), Brown et al.
patent: 4300087 (1981-11-01), Meisner
Ault Anita M.
Vivitar Corporation
Wong Peter S.
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