Electrical computers and digital processing systems: support – Computer power control – Power conservation
Reexamination Certificate
2008-07-22
2008-07-22
Cao, Chun (Department: 2115)
Electrical computers and digital processing systems: support
Computer power control
Power conservation
C701S036000, C713S324000
Reexamination Certificate
active
07404097
ABSTRACT:
The vehicle-installed microcomputer system includes an A/D converter converting analog signal sent from an onboard sensor circuit into digital signal, a microcomputer which operates in one of regular mode where a predetermined arithmetic computation on the digital signal is performed, and sleep mode where the predetermined arithmetic computation is prohibited from being performed, a first power supply circuit supplied with electric power from outside to produce a power supply voltage to be applied to the microcomputer, a second power supply circuit supplied with electric power from outside through an interruption switch to produce a power supply voltage to be applied to the A/D converter and the sensor circuit, the second power supply circuit having an output voltage accuracy higher than that of the first power supply circuit. The power interruption switch is opened to prohibit the second power supply circuit from being supplied with electric power in the sleep mode.
REFERENCES:
patent: 6642879 (2003-11-01), Amar et al.
patent: 7276887 (2007-10-01), Miki et al.
patent: 2007/0018711 (2007-01-01), Miki et al.
patent: A 2004-280763 (2004-10-01), None
Nomoto Kazuo
Suzuki Tatsuya
Yamamoto Naoki
Cao Chun
Denso Corporation
Oliff & Berridg,e PLC
Wang Albert
LandOfFree
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