Power Source Device
First Claim
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1. A power supply apparatus comprising:
- a voltage generation circuit having a switching element;
a control circuit which controls a switching operation of the switching element;
a voltage comparator which compares an output voltage from the voltage generation circuit with a predetermined test voltage; and
a timer circuit to be activated, when the output voltage from the voltage generation circuit is lower than the test voltage, to measure elapsed time, wherein the control circuit stops the switching operation of the switching element when the elapsed time measured by the timer circuit has exceeded a predetermined period of time.
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Abstract
A power supply apparatus is provided in the exemplary embodiments. The voltage generation circuit has a switching element. The control circuit controls a switching operation of the switching element. The voltage comparator compares an output voltage from the voltage generation circuit with a predetermined test voltage. The timer circuit is activated, when the output voltage from the voltage generation circuit is lower than the test voltage, and then measures elapsed time. The control circuit stops the switching operation of the switching element when the elapsed time measured by the timer circuit has exceeded a predetermined period of time.
38 Citations
11 Claims
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1. A power supply apparatus comprising:
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a voltage generation circuit having a switching element;
a control circuit which controls a switching operation of the switching element;
a voltage comparator which compares an output voltage from the voltage generation circuit with a predetermined test voltage; and
a timer circuit to be activated, when the output voltage from the voltage generation circuit is lower than the test voltage, to measure elapsed time, wherein the control circuit stops the switching operation of the switching element when the elapsed time measured by the timer circuit has exceeded a predetermined period of time. - View Dependent Claims (3, 4, 5, 6)
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2. A power supply apparatus comprising:
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a voltage generation circuit having a switching element;
a control circuit which controls a switching operation of the switching element;
a timer circuit which outputs a signal of a predetermined level when a predetermined period of time has elapsed from an initiation of a switching operation; and
a voltage comparator to be activated, when the signal of a predetermined level is output from the timer circuit, to compare an output voltage from the voltage generation circuit with a predetermined test voltage, wherein the control circuit stops the switching operation of the switching element when the output voltage from the voltage generation circuit is lower than the test voltage. - View Dependent Claims (9, 10, 11)
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7. A method for controlling a voltage generation circuit having a switching element, comprising:
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performing a voltage comparison between an output voltage from the voltage generation circuit and a predetermined test voltage;
measuring a period of time while the output voltage from the voltage generation circuit is lower than the test voltage; and
stopping a switching operation of the switching element when a period of time measured through the time measurement has exceeded a predetermined period of time.
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8. A method for controlling a voltage generation circuit having a switching element, comprising:
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detecting that a predetermined period of time has elapsed from an initiation of a switching operation of the switching element;
performing a voltage comparison between an output voltage from the voltage generation circuit and a predetermined test voltage when it is detected that the predetermined period of time has elapsed; and
stopping a switching operation of the switching element when as a result of the voltage comparison, an output voltage from the voltage generation circuit is lower than a test voltage.
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Specification