US 7,893,655 B2
Charging and power supply for mobile devicesGeneral
US 7,893,655 B2
Charging and power supply for mobile devices
Tech Center:
2800 Semiconductors/Memory, Circuits/Measuring and Testing, Optics/Photocopying, Printing/Measuring and Testing
Examiner:
Edward Tso
Art Unit:
2858 Printing/Measuring and Testing
Agent:
Inventors:
Dusan VESELIC
Priority:
12/13/05
Filed:
03/03/10
Granted:
02/22/11
Expiration:
12/13/25
Abstract
Charging and power supply for mobile devices is disclosed. A USB-compliant charging and power supply circuit includes switch-mode battery charging circuitry for receiving power from an external power source and for supplying output power through an output node to an electronic system of an electronic communication device and a battery. Battery isolation circuitry includes a semiconductor switch connecting the output node to the battery. The battery isolation circuitry senses voltage at the output node and variably restricts current to the battery when the voltage is below a minimum voltage value by operationally controlling the semiconductor switch as current passes through it. During variable current restriction the electronic system is supplied required power with said battery being supplied any additional available power.
Cooperative Patent Classification (CPC)
H02H02J7/0068H02JY10T29/49117Y10T