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Short-circuit protection circuit

A short-circuit protection circuit and resistance technology, applied in the direction of protection reacting to overcurrent, etc., can solve the problems of complicated operation and high cost of protection circuit

Inactive Publication Date: 2019-03-08
UBTECH ROBOTICS CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the embodiment of the present invention provides a short-circuit protection circuit, which aims to solve the problems of high cost and complicated operation of the existing protection circuit

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] An embodiment of the present invention provides a short-circuit protection circuit, which can be integrated into a circuit board to form a short-circuit protection device connected between a power supply and a load, such as a robot, a mobile terminal (such as a mobile phone, a tablet computer, etc.) When the load is short-circuited during the process of supplying power to the load, it prevents damage to the electronic components in the power supply and the load. Of course, the short circuit protection circuit can also be integrated in the power supply or load.

[0041] Such as figure 1As shown, the short circuit protection circuit 10 provided in this embodiment includes a first voltage divider module 101 , a second voltage divider module 102 , a control chip 103 , a comparison module 104 , a power resistor 105 and a switch module 106 .

[0042] The first end of the power resistor 105 is connected to the power supply 20, and the second end of the power resistor 105 is r...

Embodiment 2

[0049] This embodiment is a further description of Embodiment 1. Based on the implementation of Embodiment 1, this embodiment is the same or similar to Embodiment 1. For details, refer to the relevant description of Embodiment 1, which will not be repeated here. Such as image 3 As shown, in this embodiment, the switch module 106 includes a first switch unit 1061 and a second switch unit 1062 .

[0050] The first terminal of the first switch unit 1061 is the second terminal of the switch module 106, the second terminal of the first switch unit 1061 is grounded, and the third terminal of the first switch unit 1061 is connected to the second terminal of the first switch unit 1061. The first ends of the two switch units 1062 are connected; the second end of the second switch unit 1062 is the first end of the switch module 106, and the third end of the second switch unit 1062 is the first end of the switch module 106. third end.

[0051] In a specific application, when the above...

Embodiment 3

[0056] Figure 4 It is an example diagram of electronic components of a short-circuit protection circuit provided in this embodiment. For the convenience of explanation, only the parts related to this embodiment are shown. For the parts related to the previous embodiments, please refer to the relevant descriptions of the previous embodiments. I won’t go into details here, such as Figure 4 As shown: in this embodiment, the first switch unit 1061 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and a first switch element Q1.

[0057] The first end of the fifth resistor R5 is connected to the first end of the first switch element Q1, and the second end of the fifth resistor R5 is connected to the first end of the sixth resistor R6 to form the The first end of the first switch unit Q1; the second end of the sixth resistor R6 is grounded; the second end of the first switch element Q1 is connected to the first end of the seventh resistor R7, and the first ...

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Abstract

The invention belongs to the technical field of electronic circuits, and provides a short-circuit protection circuit. The short-circuit protection circuit comprises a first voltage dividing module, asecond voltage dividing module, a control chip, a comparison module, a power resistor and a switching module; the first end of the power resistor is connected with a power supply; the second end of the power resistor is separately connected with the first end of the first voltage dividing module and the first end of the switching module; the second end of the first voltage dividing module is connected with the first input end of the comparison module; the third end of the first voltage dividing module is grounded; the first end of the second voltage dividing module is connected with the powersupply; the second end of the second voltage dividing module is connected with the second input end of the comparison module; the third end of the second voltage dividing module is grounded; the output end of the comparison module is connected with the input end of the control chip; the output end of the control chip is connected with the second end of the switching module; and the third end of the switching module is connected with a load. Power supply is stopped when the load is short-circuited; damage of the power supply and an electronic device in the load is prevented; the structure is simple and easy to implement; and the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, in particular to a short circuit protection circuit. Background technique [0002] When the power supply supplies power to the load, when a short circuit occurs inside the load, it will cause damage to the electronic components or power supply in the load, and may also cause a safety accident. [0003] At present, the main way to achieve short-circuit protection is to use a fuse. When the current is too large, the fuse will automatically blow. This kind of short-circuit protection circuit requires frequent replacement of the fuse. The maintenance cost of the circuit is high, and the operation is troublesome. In addition, it takes a period of time for the fuse to blow. . Contents of the invention [0004] In view of this, an embodiment of the present invention provides a short circuit protection circuit, aiming at solving the problems of high cost and complicated operation of the e...

Claims

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Application Information

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IPC IPC(8): H02H3/08
Inventor 熊友军王浩
Owner UBTECH ROBOTICS CORP LTD