Electricity: battery or capacitor charging or discharging – Battery or cell charging – With thermal condition detection
Reexamination Certificate
1999-12-08
2001-08-14
Wong, Peter S. (Department: 2838)
Electricity: battery or capacitor charging or discharging
Battery or cell charging
With thermal condition detection
Reexamination Certificate
active
06275011
ABSTRACT:
BACKGROUND OF THE INVENTION
(a) Field of the Invention
A Charging Circuit suitable for Broad Voltage Changing Range and of the type of temperature detection automatic cutoff and of Transient Status Maintaining, composed of Transient Maintaining Ckt. suitable for Broad Voltage Range and Negative Temperature Coefficient Resistor Elements serving to verify the temperature of rechargeable cells, such that once the cell is charged to saturation and the temperature of the rechargeable cell rises to a predetermined level, the Negative Temperature Resistor Element will reduce its resistance in response, and that in turn will cutoff the Ckt. automatically, switch to a small current charging status, and the charging status will be maintained once the resistance of the Negative Temp. Coefficient Resistor Element reverts to increase should the temp. of the cell that is being charged go down, or should voltage fluctuation remain within a predetermined power supply voltage level, and the Circuit will reset itself once the rechargeable cell is removed or the power supply suspended.
(b) Description of the Prior Art
As is well known in the profession, conventionally a Charging Ckt. of the Automatic Cutoff and Transient Status Maintaining Type relies on Voltage or Current Detector composed of electronic elements to charge Rechargeable Cells incorporating Temp. Control Switches which, on sensing that there is a rising in temp. as a result of the rechargeable cell reaching saturation, will cause the charging unit to turn to feed a smaller current to the rechargeable cell, whereby the charging function is maintained all the while, a major shortcoming with such conventional Charging Ckt. of the Automatic Cutoff and Transient Status Maintaining Type is that it involves lots of electronic components built on a complicated structure necessitating expensive costs, and most regrettably, low reliability.
SUMMARY OF THE INVENTION
The primary object of the invention is to provide a Charging Ckt. suitable for Broad Voltage Changing Range and of the type of Temperature Detection Automatic Cutoff and of the Type of Transient status Maintaining which is able to control a thyrister to cut off the Main Charging Current once the saturation temperature of the rechargeable cell rises to a predetermined level that is sensed on a negative temp. coefficient resistor element which is coupled directly or indirectly to the same rechargeable cell, structurally the invention comprises:
Charging power supply: which can be any of a pure D.C., half-wave D.C., Full-Wave D.C., Intermittent Pulsating D.C., or rippled D.C. type; or alternatively one of a stabilized source or one variable source of which voltage variation is restricted within a predetermined ranging;
Rechargeable Cell: A Secondary Rechargeable Cell to be matched to a Thermo-control Switch and characterized by a rise in temperature concurrent with saturation;
Transient status Maintaining Ckt. fit for a Broad Voltage Ranging; composed of solid state electronic or electric components to be controlled as a function of negative temperature coefficient resistive elements incorporated on the rechargeable cell itself and serving to detect the instantaneous temp. of the same rechargeable cell, such that once at any given instant the charging action taking place on the rechargeable cell brings the temp. up to the point of approaching the saturation temp. the resistance on the part of the negative temp. coefficient resistor will reduce in response, and that eventually putting the Control Thyrister SCR open, meantime a Topping Charge of a smaller magnitude will pass a shunt bypass in parallel across the Anode A and Cathode K of said Thyrister, whereby a continued charging function is maintained concurrent with a continuous charging capability suitable for operation with a Transient Status Maintaining Ckt. under a Broad Voltage Changing Range clear and free of interferences until and unless the power supply is cutoff, or the rechargeable cell removed, whereupon the Transient Status Maintaining Ckt. will reset itself forthwith.
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Bacon & Thomas PLLC
Tibbits Pia
Wong Peter S.
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