Electricity: motive power systems – Automatic and/or with time-delay means – Responsive to thermal conditions
Reexamination Certificate
2006-05-02
2006-05-02
Fletcher, Marlon T. (Department: 2837)
Electricity: motive power systems
Automatic and/or with time-delay means
Responsive to thermal conditions
C318S472000, C318S473000, C318S474000, C318S477000, C318S432000, C318S434000
Reexamination Certificate
active
07038415
ABSTRACT:
A temperature sensor (33) detects the temperature of a MOS transistor (7), and a current detecting circuit (35) detects current flowing in the MOS transistor (7). When the voltage corresponding to the detected temperature or the voltage corresponding to the detected current is increased to a threshold value or more, an overheat state detecting signal and further switching signal is set to a high level. As a result, a switch circuit in a driving circuit (17) is turned on, and the gate resistance value becomes the parallel value of a resistor (25), and the PWM frequency in the PWM control circuit is lowered, whereby the switching loss of the MOS transistor (7) can be reduced under the state that the motor (2) is rotated.
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Nakamura Koji
Nomura Manabu
Yoshimura Satoshi
Denso Corporation
Fletcher Marlon T.
Posz Law Group , PLC
Smith Tyrone
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