Charging device having a broad voltage changing range, automatic charging cutoff based on temperature detection, and charging status maintenance.

DETAILED DESCRIPTION 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