POWER SUPPLY MONITORING CIRCUIT, AC/DC CONVERSION APPARATUS AND CONTROL METHOD OF POWER SUPPLY MONITORING CIRCUIT
First Claim
1. A power supply monitoring circuit comprising:
- a holding part holding, every time a local maximum value of a power supply voltage which fluctuates is detected, the local maximum value as a local maximum voltage value;
a power stop detector detecting whether or not supply of the power supply voltage is stopped based on whether or not a state that a value of the power supply voltage is smaller than a first reference value according to the local maximum voltage value continues longer than a predetermined period; and
a reference value controller decreasing the first reference value during a period in which the value of the power supply voltage exceeds a second reference value smaller than the first reference value and in which stop of the supply of the power supply voltage is detected.
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Accused Products
Abstract
There is provided a power supply monitoring circuit including a holding part holding, every time a local maximum value of a power supply voltage which fluctuates is detected, the local maximum value as a local maximum voltage value, a power stop detector detecting whether or not supply of the power supply voltage is stopped based on whether or not a state that a value of the power supply voltage is smaller than a first reference value according to the local maximum voltage value continues longer than a predetermined period, and a reference value controller decreasing the first reference value during a period in which the value of the power supply voltage exceeds a second reference value smaller than the first reference value and in which stop of the supply of the power supply voltage is detected.
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Citations
9 Claims
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1. A power supply monitoring circuit comprising:
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a holding part holding, every time a local maximum value of a power supply voltage which fluctuates is detected, the local maximum value as a local maximum voltage value; a power stop detector detecting whether or not supply of the power supply voltage is stopped based on whether or not a state that a value of the power supply voltage is smaller than a first reference value according to the local maximum voltage value continues longer than a predetermined period; and a reference value controller decreasing the first reference value during a period in which the value of the power supply voltage exceeds a second reference value smaller than the first reference value and in which stop of the supply of the power supply voltage is detected. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An AC/DC conversion apparatus comprising:
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a rectifier circuit generating a pulsating flow signal by rectifying an AC signal; a holding part holding, every time a local maximum value of a power supply voltage as a voltage of the pulsating flow signal is detected, the local maximum value as a local maximum voltage value; a power stop detector detecting whether or not supply of the power supply voltage is stopped based on whether or not a state that a value of the power supply voltage is smaller than a first reference value according to the local maximum voltage value continues longer than a predetermined period; and a reference value controller decreasing the first reference value during a period in which the value of the power supply voltage exceeds a second reference value smaller than the first reference value and in which stop of the supply of the power supply voltage is detected.
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9. A control method of a power supply monitoring circuit, comprising:
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detecting, by a power stop detector, whether or not supply of a power supply voltage is stopped based on whether or not a state continues longer than a predetermined period, the state being that a value of the power supply voltage is smaller than a first reference value according to a local maximum voltage value which is held by a holding part holding, every time a local maximum value of the power supply voltage which fluctuates is detected, the local maximum value as the local maximum voltage value; and decreasing, by a reference value controller, the first reference value during a period in which the value of the power supply voltage exceeds a second reference value smaller than the first reference value and in which stop of the supply of the power supply voltage is detected.
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Specification