Over-temperature protection method, over-temperature protection circuit and linear driving circuit thereof
AssigneeSilergy Semiconductor Technology (Hangzhou) LTD
InventorJin Jin
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Abstract
A method of over-temperature protection for a power switch, can include: (i) generating a sensing signal by sensing a temperature of the power switch; (ii) determining a temperature threshold signal based on a conduction voltage between first and second terminals of the power switch, where a value of the temperature threshold signal is reduced as the conduction voltage increases; and (iii) turning off the power switch when the sensing signal is greater than or equal to the temperature threshold signal.
Claims10
A method of over-temperature protection for a power switch, the method comprising:
- a) generating a sensing signal by sensing a temperature of said power switch;
- b) determining a temperature threshold signal based on a conduction voltage between first and second terminals of said power switch, wherein a value of said temperature threshold signal is reduced as said conduction voltage increases;
- and
- c) turning off said power switch when said sensing signal is greater than or equal to said temperature threshold signal.
An over-temperature protection circuit for a power switch, comprising:
- a) a temperature sensing circuit configured to output a sensing signal by sensing a temperature of said power switch;
- b) a temperature threshold signal generating circuit configured to generate a temperature threshold signal based on a conduction voltage between first and second terminals of said power switch, wherein a value of said temperature threshold signal is reduced as said conduction voltage increases;
- and
- c) a protection signal generating circuit configured to generate an over-temperature protection signal according to said sensing signal and said temperature threshold signal, wherein said over-temperature protection signal is activated to turn off said power switch when said sensing signal is greater than or equal to said temperature threshold signal.
Dependencies are inferred from the claim text.