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Over-temperature protection method, circuit and linear driving circuit with circuit

An over-temperature protection circuit and over-temperature protection technology, applied in the field of electronics, can solve the problems of complicated operation, inaccurate temperature detection, and inability to realize the self-starting of power tubes, and achieve the effect of reducing inherent errors and timely protection.

Active Publication Date: 2015-08-05
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can avoid the problem of inaccurate temperature detection, it cannot realize the self-starting of the power tube, that is, it needs to be powered on again after each latch-off, and the operation is cumbersome.

Method used

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  • Over-temperature protection method, circuit and linear driving circuit with circuit
  • Over-temperature protection method, circuit and linear driving circuit with circuit
  • Over-temperature protection method, circuit and linear driving circuit with circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] figure 2 For a schematic flow chart of a power tube over-temperature protection method provided in this embodiment, see figure 2 As shown, the method mainly includes the following steps:

[0055] Step 201: Detect the temperature of the power tube, and output a detection signal representing the currently detected temperature.

[0056] In this embodiment, the temperature of the power tube is detected to obtain a detection temperature (denoted as T sens ), and according to the detection temperature T sens Output one represents the current detection temperature T sens The probe signal S temp , so that the detection temperature T sens The higher the corresponding detection signal S temp higher.

[0057] As an illustration of this embodiment, the temperature of the power tube can be detected by the temperature sensing unit, and the detected temperature T sens The probe signal S temp It can be a voltage signal, that is, the temperature detected by the sensor in the ...

Embodiment 2

[0077] image 3 , 4 For the schematic diagram of the circuit principle of a power tube over-temperature protection circuit provided in Embodiment 1, see image 3 As shown, it mainly includes: a temperature detection circuit 301 , a temperature threshold signal generation circuit 302 and a protection signal generation circuit 303 . Its connection relationship and working principle are as follows:

[0078] Wherein, the temperature detecting circuit 301 detects the temperature of the power tube, and outputs a signal representing the detected temperature T sens The probe signal S temp . As an illustration of this embodiment, the temperature detection circuit 301 may include a temperature sensing unit to detect the temperature of the protected power tube.

[0079] The temperature threshold signal generating circuit 302 is based on the conduction voltage V between the first polarity terminal and the second polarity terminal of the power tube ds , the output temperature thresho...

Embodiment 3

[0099] In this embodiment, the Figure 5 The power tube over-temperature protection circuit 300 is used as an example in the linear drive circuit shown, and the implementation of the power tube over-temperature protection circuit is further described.

[0100] see Figure 5 As shown, the linear drive circuit of this embodiment mainly includes a main power stage circuit, and the main power stage circuit includes a power transistor M5 and an over-temperature protection circuit 300 disposed in the main power circuit.

[0101] see Figure 5 As shown, the first polarity terminal of the power tube M5 is coupled to the DC voltage input terminal Vout of the linear drive circuit through the load, and the second polarity terminal is coupled to the ground terminal through the detection resistor Rs, so that the first polarity of the power tube M5 flows through the power tube M5. The currents at the polarity terminal and the second polarity terminal are output currents of the linear driv...

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PUM

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Abstract

The invention provides an over-temperature protection method, a circuit and a linear driving circuit with the circuit. The over-temperature protection method of a power tube comprises a step of determining a temperature threshold signal according to the conduction voltage between the first polar end and the second polar end of a current power tube such that the larger the conduction voltage is large the smaller the value of the temperature threshold signal is, a step of detecting the temperature of the power tube to obtain a detection signal which presents temperature, and a step of controls the switch-on and switch-off of the power tube when the detection signal is larger than or equal to the temperature threshold signal. According to the technical scheme, the power tube is protected timely, and the protection is more reliable.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/10H02H5/04H02M1/08
CPCG05F1/569H01H37/32
Inventor 金津
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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