Device for detection of power-off
First Claim
1. A device for detecting a power-off of external input power from a power supply device, comprising:
- a detection unit for generating an induced current in response to an AC current provided by the power supply device;
a voltage supply unit for converting the induced current generated by the detection unit into a detection voltage; and
a voltage comparison unit for comparing the detection voltage provided by the voltage supply unit and a reference voltage, and for providing a power-off detection signal when there is a difference between the detection voltage and the reference voltage.
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Accused Products
Abstract
A power-off detection device is formed without use of a photo coupler, which is expensive and occupies a relatively large area. The power-off detection device rectifies AC power, provided as external input power from a power supply device, into DC power, detects the power-off of the external input power from the power supply device as provided to an electronic appliance, provides a power-off detection signal to central control means of the electronic appliance, and enables the central control means to prepare for the power-off, thereby reducing manufacturing cost of the power supply device, and achieving miniaturization thereof.
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Citations
11 Claims
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1. A device for detecting a power-off of external input power from a power supply device, comprising:
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a detection unit for generating an induced current in response to an AC current provided by the power supply device;
a voltage supply unit for converting the induced current generated by the detection unit into a detection voltage; and
a voltage comparison unit for comparing the detection voltage provided by the voltage supply unit and a reference voltage, and for providing a power-off detection signal when there is a difference between the detection voltage and the reference voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A device for detecting a power-off of an external input power from a power supply device, comprising:
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a transformer for generating an induced current in response to AC power provided by the power supply device;
a voltage supply unit for smoothing and rectifying the induced current generated by the transformer to provide a detection voltage; and
a voltage comparison unit for comparing the detection voltage provided by the voltage supply unit and a reference voltage, and for providing a power-off detection signal when there is a difference between the detection voltage and the reference voltage.
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Specification