Driving circuit of load

Details Driving circuit of load Driving circuit of load

2009-09-25

2011-10-11

Berhane, Adolf (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S283000, C323S284000

Reexamination Certificate

active

08035366

ABSTRACT:
A driving circuit of a load has an output semiconductor element connected in series in a power supply path from a power source to the load, to control a current of the load, a PWM signal generator for controlling ON/OFF of the output semiconductor element, a driver of the output semiconductor element according to the PWM signal, a detection resistor made of a semiconductor detecting a current of the load, a current output amplifier outputting a monitored current of detection resistor without being influenced by variation of ambient temperature, a resistor converting the monitored current into a monitored voltage, a current source outputting a constant current without being influenced by variation of ambient temperature, a resistor outputting a reference voltage according to the constant current, and an A/D converter converting the monitored voltage according to the reference voltage into a detected current value of the current of the load.

REFERENCES:
patent: 6476589 (2002-11-01), Umminger et al.
patent: 7268529 (2007-09-01), Mochizuki et al.
patent: 7408388 (2008-08-01), Nagasawa et al.
patent: 7764057 (2010-07-01), Groom
patent: 2003/0020442 (2003-01-01), Hwang
patent: 2000-114039 (2000-04-01), None

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