Electromagnetic load drive apparatus
First Claim
1. An electromagnetic load drive apparatus for an electromagnetic load having an inductive element, the apparatus comprising:
- a DC low voltage power source;
a capacitive element as a power source for feeding electric power to the inductive element at the time of operating the electromagnetic load, and recovering energy accumulated in the inductive element due to supply of electric power, the energy being recovered by the capacitive element at the time when the operation of the electromagnetic load is stopped;
first switching means for switching between a first state where a terminal of the capacitive element on a reference potential side is connected to a terminal of the low voltage power source on a side opposite to the terminal of the reference potential side and a second state where the terminal of the capacitive element on the reference potential side is connected to a terminal of the low voltage power source on the reference potential side; and
control means for controlling the first switching means to select the first state when the electromagnetic load is in operation so that the electric power is fed to the inductive element from the capacitive element and the low voltage power source that are connected in series, and to select the second state when the operation of the electromagnetic load is stopped.
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Accused Products
Abstract
A drive apparatus supplies electric power to a solenoid of an inductive load from a battery and a capacitor to improve response of the load. The drive apparatus comprises switches for switching between a first state where a negative side of the battery is connected to a positive side of the battery, and a second state where the negative side of the capacitor is connected to the negative side of the battery. When the load is in operation, the voltage applied to the solenoid is raised by the voltage of the battery as the first state, so that the current flowing into the solenoid rises sharply to improve response of the load. When the operation of the load is to be stopped, the electric power to the solenoid is interrupted, and the energy accumulated in the solenoid is recovered by the capacitor as the second state.
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Citations
10 Claims
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1. An electromagnetic load drive apparatus for an electromagnetic load having an inductive element, the apparatus comprising:
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a DC low voltage power source;
a capacitive element as a power source for feeding electric power to the inductive element at the time of operating the electromagnetic load, and recovering energy accumulated in the inductive element due to supply of electric power, the energy being recovered by the capacitive element at the time when the operation of the electromagnetic load is stopped;
first switching means for switching between a first state where a terminal of the capacitive element on a reference potential side is connected to a terminal of the low voltage power source on a side opposite to the terminal of the reference potential side and a second state where the terminal of the capacitive element on the reference potential side is connected to a terminal of the low voltage power source on the reference potential side; and
control means for controlling the first switching means to select the first state when the electromagnetic load is in operation so that the electric power is fed to the inductive element from the capacitive element and the low voltage power source that are connected in series, and to select the second state when the operation of the electromagnetic load is stopped. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification