Load control device and method
First Claim
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1. A load control device comprising:
- a control circuit that controls driving of a load; and
a protection circuit that monitors a power supply voltage supplied to the control circuit and stops control by the control circuit when the power supply voltage drops below a threshold value,wherein the protection circuit has a means to provide the threshold value with a hysteresis characteristic having a width equal to or larger than a voltage drop level based on a wiring resistance of a path for supplying a driving current to the load and a maximum value of the driving current.
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Abstract
A load control device includes a control circuit and a protection circuit. The control circuit controls driving of an electric load. The protection circuit monitors a power supply voltage supplied to the control circuit and stops control of driving the load by the control circuit, when the power supply voltage drops below a threshold value. The protection circuit provides the threshold value with a hysteresis characteristic having a width determined by a product of a wiring resistance of a path for supplying a driving current to the load and a maximum value of the driving current.
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Citations
20 Claims
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1. A load control device comprising:
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a control circuit that controls driving of a load; and a protection circuit that monitors a power supply voltage supplied to the control circuit and stops control by the control circuit when the power supply voltage drops below a threshold value, wherein the protection circuit has a means to provide the threshold value with a hysteresis characteristic having a width equal to or larger than a voltage drop level based on a wiring resistance of a path for supplying a driving current to the load and a maximum value of the driving current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A load control method comprising the steps of:
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monitoring a power supply voltage supplied to a control circuit for controlling driving of a load; stopping control by the control circuit when the power supply voltage drops below a threshold value; changing the threshold value by adding a hysteresis when the control is stopped, the hysteresis having a width equal to or larger than a voltage drop level determined based on a wiring resistance of a path for supplying a driving current to the load and a maximum value of the driving current; resuming the control by the control circuit when the power supply voltage rises above the threshold value changed with the hysteresis. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification