Peak detecting circuiit for an input voltage and associated method
AssigneeChengdu Monolithic Power Systems Co., Ltd.
InventorsYuedong Chen, Junhong Li, Jiangwei Cheng
Life of this patent
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Abstract
A method for detecting a variation of input voltage. The method is generating an indication signal based on the input voltage, and comparing the input voltage with a first reference signal. The first reference signal is smaller than the indication signal, and if the input voltage is consistently smaller than the first reference signal during a first time duration from the moment when the input voltage is decreased to the first reference signal, the indication signal is decreased after the first time duration.
Claims12
A method for detecting an input voltage by using a peak detecting circuit, wherein the input voltage has a plurality of portions, each of the plurality of portions of the input voltage occupies a time duration equal to a period and has a respective peak value, the method comprising:
- generating an indication signal based on the input voltage, the indication signal has a first value indicating the peak value of a first one of the plurality of portions of the input voltage;
- generating a first reference signal based on the indication signal, wherein the first reference signal is smaller than the indication signal;
- and
- adjusting the indication signal by an adjusting circuit comprises a comparator comparing the input voltage with the first reference signal;
- and wherein
- decreasing the indication signal after a first time duration beginning from a moment when the input voltage is decreased to the first reference signal, if the input voltage is consistently smaller than the first reference signal during the first time duration, wherein the first time duration is longer than twice of the period of the input voltage.
A method for detecting an input voltage by using a peak detecting circuit, wherein the input voltage has a plurality of portions, each of the plurality of portions of the input voltage occupies a time duration equal to a period and has a respective peak value, the method comprising:
- generating an indication signal based on the input voltage, the indication signal has a first value indicating the peak value of a first one of the plurality of portions of the input voltage;
- generating a first reference signal and a second reference signal based on the indication signal, wherein the first reference signal is smaller than the indication signal, and the second reference signal is smaller than the first reference signal;
- and
- adjusting the indication signal by an adjusting circuit comprises a comparator comparing the input voltage with the first reference signal and the second reference signal;
- wherein
- decreasing the indication signal after a first time duration beginning from a moment when the input voltage is decreased to the first reference signal, if the input voltage is consistently smaller than the first reference signal and is equal to the second reference signal at any moment during the first time duration;
- and wherein
- decreasing the indication signal after a second time duration beginning from a moment when the input voltage is decreased to the second reference signal, if the input voltage is consistently smaller than the second reference signal during the second time duration;
- wherein the first time duration is longer than twice of the period of the input voltage, the second time duration is longer than the period of the input voltage and shorter than twice of the period of the input voltage.
Dependencies are inferred from the claim text.