Power source for a hybrid vehicle
First Claim
1. A power source for a hybrid vehicle having an engine and a motor generator and using a high voltage for driving the motor generator, a medium voltage for driving a motor of an auxiliary device, and a low voltage for a controller, and including a secondary battery for the high voltage and a secondary battery for the low voltage, comprising;
- a step-down circuit for stepping down the medium voltage to the low voltage and aback electromotive force detecting means for detecting generation of a back electromotive force in the motor of the auxiliary device and charging the low voltage stepped down by the step-down circuit in the secondary battery for the low voltage.
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Accused Products
Abstract
A power source for a hybrid vehicle is provided which can protect its electric motor driving circuit from being damaged by a back electromotive force generated in a motor. The back electromotive force generated in an electric motor 44 is detected by a high voltage detector circuit 48 and converted by a step-down circuit 46into a low voltage which is then stored in a low-voltage secondary battery 28. Accordingly, as the back electromotive force does not become excessively high, it will be prevented from damaging a switching circuit 42. Also, the back electromotive force generated in the motor 44 is charged in the low-voltage secondary battery 28 and can thus be supplied to a control circuit 40 or any other component, contributing to the reduction of the fuel consumption of the hybrid vehicle.
12 Citations
6 Claims
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1. A power source for a hybrid vehicle having an engine and a motor generator and using a high voltage for driving the motor generator, a medium voltage for driving a motor of an auxiliary device, and a low voltage for a controller, and including a secondary battery for the high voltage and a secondary battery for the low voltage, comprising;
- a step-down circuit for stepping down the medium voltage to the low voltage and aback electromotive force detecting means for detecting generation of a back electromotive force in the motor of the auxiliary device and charging the low voltage stepped down by the step-down circuit in the secondary battery for the low voltage.
- View Dependent Claims (4)
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2. A power source for a hybrid vehicle having an engine and a motor generator and using a high voltage for driving the motor generator, a medium voltage for driving a motor of an auxiliary device, and a low voltage for a controller, including a secondary battery for the high voltage and a secondary battery for the low voltage, comprising;
- a secondary battery for the medium voltage and back electromotive force detecting means for detecting generation of a back electromotive force in the motor of the auxiliary device and for charging the back electromotive force in the secondary battery for the medium voltage.
- View Dependent Claims (5)
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3. A power source for a hybrid vehicle having an engine and a motor generator and using a high voltage for driving the motor generator, a medium voltage for driving a motor of an auxiliary device, and a low voltage for a controller, and including a secondary battery for the high voltage and a secondary battery for the low voltage, comprising;
- a secondary battery for the medium voltage arranged for temporarily maintaining the power of a back electromotive force generated in the motor of the auxiliary device and supplying an electricity to the motor of the auxiliary device.
- View Dependent Claims (6)
Specification