TEMPERATURE PROTECTION CIRCUIT, POWER SUPPLY, AND ELECTRONIC DEVICE
First Claim
1. A temperature protection circuit comprising:
- circuitry to compare a monitored temperature with each of a plurality of threshold temperatures to find the monitored temperature to have reached a threshold temperature when the monitored temperature has been maintained at the threshold temperature or higher over a predetermined confirmation period;
circuitry to set the confirmation period longer according as a threshold temperature compared with the monitored temperature is lower; and
circuitry to generate a temperature protection signal corresponding to a threshold temperature that the monitored temperature is found to have reached.
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Accused Products
Abstract
A temperature protection circuit comprises means adapted to compare the temperature being monitored with each of threshold temperatures and judging that the temperature being monitored reaches a threshold temperature when the temperature being monitored is maintained at the threshold temperature or more for a predetermined confirmation period, means adapted to set a longer confirmation period as the threshold temperature compared with the temperature being monitored is lower, means adapted to generate one of corresponding temperature protection signals (Sarm, Slmt, Stsd1, Stsd2) according to the judgment of which threshold temperature the temperature being monitored reaches. With this constitution, temperature protection operation can be preformed with high accuracy and high safety without unnecessarily narrowing the range of the operating temperature of an IC to be protected.
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Citations
7 Claims
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1. A temperature protection circuit comprising:
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circuitry to compare a monitored temperature with each of a plurality of threshold temperatures to find the monitored temperature to have reached a threshold temperature when the monitored temperature has been maintained at the threshold temperature or higher over a predetermined confirmation period; circuitry to set the confirmation period longer according as a threshold temperature compared with the monitored temperature is lower; and circuitry to generate a temperature protection signal corresponding to a threshold temperature that the monitored temperature is found to have reached. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification