Title:
ELECTRIC LOAD CONTROL CIRCUIT FOR VEHICLE
Document Type and Number:
Japanese Patent JP3520291
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an electric load control circuit for vehicle, which drives a field effect transistor for driving a coil by pulse width modulation(PWM) control and which is able to protect a load, when a power supply is reversely connected and increase the current efficiency with the increase in the number of components being suppressed.
SOLUTION: This circuit is constituted of a coil 3 inserted between a power supply 1 and the ground 2a, a field effect transistor 5 which is inserted between the coil 3 and the ground 2a and is provided in parallel with a parasitic diode 4, which allows current to flow only in one direction from the ground 2a to the power supply 1, an microprocessor unit(MPU) for driving the field effect transistor 5 by PWM control, a flywheel diode 6 which is inserted between a point between the downstream side of the coil 3 and the field effect transistor 5 and the upstream side of the coil 3 and which allows current to flow only in one direction from the downstream side to the upstream side of the coil 3, and a reverse connection preventing transistor 7 which is inserted between the flywheel diode 6 and the power supply 1 and is operated by the difference in voltage between the ground 2b and the flywheel diode 6.
Inventors:
Kimura, Makoto
Application Number:
JP10887098A
Publication Date:
April 19, 2004
Filing Date:
April 20, 1998
Export Citation:
Assignee:
UNISIA JECS CORP
International Classes:
B60R16/03; B60R16/02; H02H7/00; H02H11/00; H02J7/14; (IPC1-7): H02J7/14; B60R16/02; H02H7/00; H02H11/00
Attorney, Agent or Firm:
朝倉 悟 （外１名）
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