Over-temperature protection method, circuit and linear drive circuit with the circuit

An over-temperature protection circuit and over-temperature protection technology, applied in the field of electronics, can solve the problems of cumbersome operation, inaccurate temperature detection, inability to realize self-starting of power tubes, etc., and achieve the effect of timely protection and reducing inherent errors.
CN104821552BActive Publication Date: 2018-04-27SILERGY SEMICON TECH (HANGZHOU) CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
SILERGY SEMICON TECH (HANGZHOU) CO LTD
Publication Date
2018-04-27

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Abstract

An over-temperature protection method, a circuit, and a linear drive circuit with the circuit. The over-temperature protection method of a power tube includes: according to the conduction voltage between the first polarity end and the second polarity end of the power tube , determine the temperature threshold signal, so that the larger the conduction voltage, the smaller the value of the temperature threshold signal; detect the current temperature of the power tube to obtain a detection signal representing the temperature; when the detection signal When it is greater than or equal to the temperature threshold signal, the power tube is controlled to be turned off. The technical scheme protects the power tube in a more timely and reliable manner.
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Description

technical field

[0001] The invention relates to the field of electronics, in particular to an over-temperature protection method, a circuit and a linear drive circuit with the circuit. Background technique

[0002] In the power supply circuit that outputs voltage to the load through the power tube connected between the power supply terminal and the load, when the load is short-circuited, the voltage on the power tube connected in series with the load between the power supply terminal and the ground terminal in these circuits will change. Large, so that the power Po that the power tube bears is too large, and then the temperature of the power tube rises, and the greater the power it bears, the higher the temperature rises. When the temperature of the power tube rises to a certain temperature, it may be Cause the power tube to be burnt out.

[0003] In order to avoid the above situation from happening, if figure 1 As shown, one approach in the prior art is to detect the temp...

Claims

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