Thermal protection of a switch
AssigneeSTMicroelectronics S.r.l.
InventorLaurent Moindron
Life of this patent
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Abstract
A method and a circuit for detecting an overheating of an electronic switch of power supply of a load by an A.C. voltage, in which a voltage representative of the temperature in the vicinity of the switch is compared with a threshold, the result of this comparison being sampled at frequency corresponding to an even multiple of the frequency of the A.C. power supply voltage, to provide a signal indicative of the fact that a temperature threshold has been exceeded.
Claims8
A method for detecting an overheating of an electronic switch of power supply of a load by an A.C. voltage, wherein a voltage representative of the temperature in the vicinity of the switch is compared with a threshold, the result of this comparison being sampled at zero values of the A.C. power supply voltage and at a frequency corresponding to an even multiple of the frequency of the A.C. power supply voltage, to provide a signal indicative of the fact that a temperature threshold has been exceeded.
A circuit for detecting a possible overheating of an A.C. switch, comprising:
- a comparator of an A.C. voltage proportional to the current temperature with respect to a threshold;
- and
- a flip-flop sampled at zero values of the A.C. voltage and at a frequency corresponding to an even multiple of the frequency of the A.C. voltage.
Dependencies are inferred from the claim text.