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Chip output short circuit protection circuit

An output short circuit and circuit protection technology, applied in the field of circuits, can solve the problems of power tube damage, burning overvoltage and overcurrent protection chips, power tube voltage difference, etc.

Pending Publication Date: 2021-05-11
SHENZHEN SIYUAN SEMICON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If VOUT is suddenly short-circuited to ground, the drain end of the power transistor in the analog short-circuit switch S0 instantly bears a voltage much higher than VIN, and the source end of the power transistor appears negative pressure; at this time, the drain-source of the power transistor will generate a very large Voltage difference, if the withstand voltage of the power tube is not enough to withstand such a high voltage, the power tube will be damaged, thus burning the overvoltage and overcurrent protection chip U1

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0055] Please refer to image 3 As shown, the first embodiment provides a chip output short circuit protection circuit 200 . The detection module TEST in the chip output short-circuit protection circuit 200 in the first embodiment includes an NPN transistor Q and a logic module LOG.

[0056] Wherein, the logic module LOG is configured to control the driving module DRI to drive the first transistor M1 to turn on when it is determined that the voltage at the negative terminal of the diode D is negative.

[0057] In this implementation manner, the logic module LOG is an analog circuit. Of course, it is not limited thereto, and the logic module LOG may also be a digital-analog hybrid circuit or a digital circuit.

[0058] The specific circuit connection structure is: the collector of the NPN transistor Q is connected to the input terminal of the logic module LOG, the base of the NPN transistor Q is used as the second end of the detection module TEST, and the emitter of the NPN t...

Embodiment 2

[0062] Please refer to Figure 4 As shown, the second embodiment provides a chip output short circuit protection circuit 300 . The circuit in the chip output short-circuit protection circuit 300 in the second embodiment is basically the same as that in the first embodiment. The difference between the two embodiments is: the detection module TEST is an NMOS transistor M2. The NMOS transistor M2 detects whether the voltage at the negative terminal of the diode D is negative to directly trigger the driving module DRI. The NMOS transistor M2 can directly trigger the driving module DRI without setting the logic module LOG in the first embodiment, and the circuit is simpler.

[0063] The specific circuit connection structure is: the drain of the NMOS transistor M2 is used as the first terminal of the detection module TEST, the gate of the NMOS transistor M2 is used as the second terminal of the detection module TEST, and the source of the NMOS transistor M2 is used as the first te...

Embodiment 3

[0067] Please refer to Figure 5 As shown, the third embodiment provides a chip output short circuit protection circuit 400 . The circuit in the chip output short-circuit protection circuit 300 in the third embodiment is basically the same as that in the second embodiment. The difference between the two embodiments is: the chip output short-circuit protection circuit 400 in the third embodiment adds a third capacitor C3 on the basis of the second embodiment.

[0068] The first end of the third capacitor C3 is respectively connected to the output end of the driving module DRI and the gate of the first transistor M1; the second end of the third capacitor C3 is respectively connected to the first transistor The drain of M1, the second terminal of the fourth inductor L4, and the first terminal of the first capacitor C1.

[0069] The third capacitor C3 is the capacitance added by the gate-drain capacitive coupling of the first transistor M1. Its function is that during the rapid...

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Abstract

The invention provides a chip output short-circuit protection circuit. The chip output short-circuit protection circuit comprises a driving module, a first transistor, a first capacitor, a second capacitor, a first inductor, a second inductor, a third inductor, a fourth inductor, a fifth inductor, a sixth inductor, a short-circuit switch, a diode and a detection module; the detection module is used for detecting whether the voltage of the cathode end of the diode is a negative value so as to trigger the driving module; and the first end of the detection module is connected to the input end of the driving module, the second end of the detection module is connected to the positive electrode end of the diode and the first end of the fifth inductor, and the third end of the detection module is connected to the source electrode of the first transistor. The reliability of chip output short circuit protection is high.

Description

technical field [0001] The invention relates to the field of circuit technology, in particular to a chip output short-circuit protection circuit applied to an overvoltage and overcurrent protection chip. Background technique [0002] At present, with the increasing use of mobile devices such as smartphones, wearable devices, power tools, and drones. Lithium-ion battery-powered applications in the mobile device are an important part of it. Due to the stability problem of lithium-ion batteries, the overvoltage and over-current protection chip is used as the front-end application of lithium-ion battery chargers to protect lithium-ion batteries and chargers. Among them, the overvoltage and overcurrent protection chip can realize various protection functions, such as input power supply and lithium battery overvoltage protection, load current limiting protection and output short circuit protection, etc. [0003] The charge and discharge current limits of the battery protection c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/00H02H7/20H02H9/02H02J7/00
CPCH02H7/008H02H7/205H02H9/02H02J7/00304H02J7/00308
Inventor 贺江平王俊喜孙晓良
Owner SHENZHEN SIYUAN SEMICON CO LTD
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