Patent ID: 7425817

Claim:
Apparatus to control a lithium-ion battery charging process, comprising; a lithium-ion battery ( 250 ); a power controller ( 240 ); a device controller ( 230 ); a radio frequency (RF) power amplifier ( 220 ); a first voltage operated switch (VOS)( 274 ) operable to control connection between the battery ( 250 ) and device ( 210 ); a thermal detection means ( 254 ), operably coupled to the power controller ( 240 ); a battery feedback means ( 242 ) operable to couple the power controller ( 240 ) to a charger ( 260 ); and the charger ( 260 ) operable to respond to the battery feedback means ( 242 ), so relating charger output to battery state, wherein the charger ( 260 ) produces a default minimum output voltage in response to a suspension in battery charging when battery temperature exceeds a threshold, characterised by; logic circuitry ( 410 , 420 , 230 , 240 ) operable to indicate that battery charging has been suspended; a first switching means ( 442 ) depending from said logic circuitry operable to disconnect the negative terminal of battery ( 250 ) from ground ( 290 ) if charging has been suspended; a second switching means ( 432 , 434 ) depending from said logic circuitry operable to connect the RF power amplifier ( 220 ) to the charger ( 260 ) if charging has been suspended.