CN219643580U - Short-circuit protection circuit and electronic equipment - Google Patents
Short-circuit protection circuit and electronic equipment Download PDFInfo
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- CN219643580U CN219643580U CN202221744766.7U CN202221744766U CN219643580U CN 219643580 U CN219643580 U CN 219643580U CN 202221744766 U CN202221744766 U CN 202221744766U CN 219643580 U CN219643580 U CN 219643580U
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- protection circuit
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- 238000001914 filtration Methods 0.000 claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims description 34
- 238000010586 diagram Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Abstract
The embodiment of the utility model discloses a short-circuit protection circuit and electronic equipment, wherein the short-circuit protection circuit comprises: the circuit comprises a filtering unit, a switching unit, a protection circuit and an output circuit; the filter unit is connected with the switch unit, the switch unit is connected with the output circuit, and the protection circuit is respectively connected with the filter unit, the switch unit and the output circuit; the switch unit is used for being disconnected when the output circuit is short-circuited, so that the output circuit stops working; the filtering unit is used for providing time for the switching unit to establish a working mode; the protection circuit is used for being disconnected when the output circuit is short-circuited, so that the switch unit is disconnected; the output circuit is used for outputting voltage. When the output circuit outputs short circuit, the protection circuit is switched on, and the enabling switch of the switch unit is switched off, so that the output circuit does not work, the purpose of heat balance of the short circuit switch device is achieved, and the chip damage caused by short circuit is effectively protected.
Description
Technical Field
The utility model relates to the technical field of electronic circuits, in particular to a short-circuit protection circuit.
Background
Chips are widely used in circuits today, however, if a circuit is shorted, the chip may be damaged due to an excessive temperature rise, so that it is important to protect the chip when the circuit is shorted.
Disclosure of Invention
Based on this, it is necessary to provide a short-circuit protection circuit for solving the above problems, and when the output circuit outputs a short circuit, the protection circuit is turned on, and the enabling switch of the switching unit is turned off, so that the output circuit does not work, thereby achieving the purpose of heat balance of the short-circuit switching device, and effectively protecting the chip from damage caused after the short circuit.
In a first aspect, the present utility model provides a short-circuit protection circuit comprising:
the circuit comprises a filtering unit, a switching unit, a protection circuit and an output circuit;
the filter unit is connected with the switch unit, the switch unit is connected with the output circuit, and the protection circuit is respectively connected with the filter unit, the switch unit and the output circuit;
the switch unit is used for being disconnected when the output circuit is short-circuited, so that the output circuit stops working;
the filtering unit is used for providing time for the switching unit to establish a working mode;
the protection circuit is used for being disconnected when the output circuit is short-circuited, so that the switch unit is disconnected;
the output circuit is used for outputting voltage.
Optionally, the filtering unit includes:
a first resistor and a first capacitor;
one end of the first resistor is a voltage input end, and the voltage input end is connected with the switch unit;
the other end of the first resistor is connected with one end of the first capacitor and the protection circuit respectively;
the other end of the first capacitor is connected with the protection circuit.
Optionally, the switching unit includes:
a step-down chip, an inductor and a diode;
the first pin of the voltage reduction chip is connected with the voltage input end of the first resistor, and the second pin of the voltage reduction chip is respectively connected with one end of the diode and one end of the inductor; the third pin of the buck chip is respectively connected with the other end of the diode and the output circuit, and is grounded; the fourth pin of the voltage reduction chip is connected with the other end of the inductor and the output circuit respectively; and a fifth pin of the voltage reduction chip is respectively connected with the protection circuit and one end of the first resistor connected with the first capacitor.
Optionally, the protection circuit includes:
a second resistor and a triode; the second resistor is connected with the triode in series;
one end of the second resistor is connected with one end of the first resistor and the fifth pin respectively; the other end of the second resistor is connected with the first interface end of the triode;
the second interface end of the triode is connected with the output circuit; the second interface end of the triode is grounded with a circuit connected with the output circuit; and the third interface end of the triode is connected with the output circuit.
Optionally, the output circuit includes:
a second capacitor, a third resistor and a fourth resistor;
one end of the second capacitor is connected with one end of the diode; the other end of the second capacitor is connected with one end of the inductor and one end of the third resistor respectively; one end of the third resistor, which is connected with the second capacitor, is a voltage output end;
the other end of the third resistor is connected with the third interface end and one end of the fourth resistor respectively; the other end of the fourth resistor is connected with the second interface end.
Optionally, one end of the second resistor connected with the fifth pin is connected with one end of the fifth resistor;
the other end of the fifth resistor is connected with the second interface end.
Optionally, the voltage input terminal is connected with one end of a third capacitor, and the other end of the third capacitor is grounded.
In a second aspect, the utility model provides an electronic device comprising a short-circuit protection circuit as described in the first aspect.
The embodiment of the utility model has the following beneficial effects: the short-circuit protection circuit comprises a filtering unit, a switching unit, a protection circuit and an output circuit, wherein the filtering unit is connected with the switching unit, the switching unit is connected with the output circuit, and the protection circuit is respectively connected with the filtering unit, the switching unit and the output circuit. When the output circuit outputs short circuit, the protection circuit is switched on, the enabling switch of the switching unit is switched off, so that the output circuit does not work, the enabling switch of the switching unit is switched on again after the re-electrifying filtering unit is reset, the output circuit outputs normally, the purpose of heat balance of the short circuit switching device is achieved, and the damage of a chip caused by short circuit is effectively protected.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Wherein:
FIG. 1 is a schematic diagram of a short-circuit protection circuit according to an embodiment of the present utility model;
fig. 2 is a schematic circuit diagram of a short-circuit protection circuit according to an embodiment of the utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1, a schematic structure diagram of a short-circuit protection circuit according to an embodiment of the utility model is shown, where the short-circuit protection circuit includes: the filter unit 10, the switch unit 20, the output circuit 30, and the protection circuit 40.
The filter unit 10 is connected to the switch unit 20, the switch unit 20 is connected to the output circuit 30, and the protection circuit 40 is connected to the filter unit 10, the switch unit 20, and the output circuit 30, respectively. The switching unit 20 is used to open when the output circuit 30 is short-circuited, so that the output circuit 30 stops operating. The filter unit 10 is used to provide time for the switching unit 20 to establish the operation mode. The protection circuit 40 is used to be opened when the output circuit 30 is short-circuited, so that the switching unit 20 is opened, thereby protecting the circuit. The output circuit 30 is for outputting a voltage.
When the output circuit is short-circuited, the protection circuit works, the switch unit is cut off, and when the circuit is electrified again, the filter unit works to make the switch unit work again, so that the output circuit can output and normally work, the purpose of heat balance of the switch devices in the short-circuit switch unit is achieved, and the requirement of long-term short circuit of product output is met.
Referring to fig. 2, a schematic structure diagram of a short-circuit protection circuit according to an embodiment of the utility model includes a filter unit 10, a switch unit 20, an output circuit 30, and a protection circuit 40 shown in fig. 1.
The filtering unit comprises a first resistor R200 and a first capacitor C201:
specifically, one end of the first resistor R200 is a voltage input end, the voltage input end is connected to the switch unit 20, the other end of the first resistor R200 is connected to one end of the first capacitor C201 and the protection circuit 40, and the other end of the first capacitor C201 is also connected to the protection circuit 40. In addition, the voltage input end is connected with one end of the third capacitor C200, and the other end of the third capacitor C200 is grounded.
The switching unit includes a buck chip Q200, an inductor L4001, and a diode D201:
IN this embodiment, the model of the buck chip Q200 may be LM-2576-5V, the buck chip Q200 has five pins, where the first pin 1 is an input terminal (IN), the second pin 2 is an output terminal (OUT), the third pin 3 is a ground point (GND), and the fourth pin 4 is a feedback pin (FBCAK); the fifth pin 5 is a switch (ON/OFF) for controlling the voltage-dropping chip Q200 to be turned ON or OFF. Specifically, the first pin 1 of the buck chip Q200 is connected to the voltage input end of the first resistor R200, the second pin 2 of the buck chip Q200 is connected to one end of the diode D201 and one end of the inductor L4001, the third pin 3 of the buck chip Q200 is connected to the other end of the diode D201 and the output circuit 30, the third pin 3 is grounded, the fourth pin 4 of the buck chip Q200 is connected to the other end of the inductor L4001 and the output circuit 30, and the fifth pin 5 of the buck chip Q200 is connected to the protection circuit 40 and one end of the first resistor R200 connected to the first capacitor C201.
The protection circuit 40 includes a second resistor R206 and a transistor D200:
specifically, the second resistor R206 is connected in series with the transistor D200. One end of the second resistor R206 is connected to one end of the first resistor R200 and the fifth pin 5, the other end of the second resistor R206 is connected to the first interface end 01 of the triode D200, the second interface end 02 of the triode D200 is connected to the output circuit 30, the circuit connected to the output circuit 30 is grounded, and the third interface end 03 of the triode D200 is connected to the output circuit 30.
One end of the second resistor R206 connected to the fifth pin 5 is connected to one end of the fifth resistor R201, and the other end of the fifth resistor R201 is connected to the second interface terminal 02.
The output circuit 30 includes a second capacitor C202, a third resistor R202, and a fourth resistor R203:
one end of the second capacitor C202 is connected to one end of the diode D201, the other end of the second capacitor C202 is connected to one end of the inductor L4001 and one end of the third resistor R202, where one end of the third resistor R202 connected to the second capacitor C202 is a voltage output end, the other end of the third resistor R202 is connected to one end of the third interface 03 and one end of the fourth resistor R203, and the other end of the fourth resistor R203 is connected to the second interface 03.
In the embodiment of the present utility model, the triode D200 is an NPN triode, and the switching characteristic of the NPN triode is that the NPN triode is turned on when the collector inputs a high level, and turned off when the collector inputs a low level. The switching characteristic of the buck chip Q200 is that when the fifth pin 5 is at a high level, the fifth pin 5 is opened, the buck chip Q200 cannot establish the operation mode, and when the fifth pin 5 is at a low level, the fifth pin 5 is closed, and the buck chip Q200 establishes the operation mode. The present embodiment designs the short-circuit protection circuit based on the switching characteristics of the NPN transistor and the switching characteristics of the buck chip Q200. In addition, if the first resistor R200 and the first capacitor C201 are not present, the fifth pin 5 of the buck chip Q200 is at a high level, and the buck chip Q200 cannot establish the operation mode, and in this embodiment, the reset time of the first resistor R200 and the first capacitor C201 is used to establish the operation mode of the buck chip Q200, that is, the first resistor R200 and the first capacitor C201 function to provide a period of time for the buck chip Q200 to establish the operation mode when the power is turned on. Specifically, the 24V input is powered on, reset through the first resistor R200 and the first capacitor C201, the buck chip Q200 establishes a working mode, the chip output is enabled to be turned on, the output of the buck chip Q200 is 5V after the chip output is enabled, the triode D200 is turned on, the fifth pin 5 of the buck chip Q200 is at a low level, and the buck chip Q200 continuously works. When the output 5V is short-circuited, the triode D200 is not conducted, the fifth pin 5 is at a high level, the output enable of the buck chip Q200 is closed, at the moment, the buck chip Q200 does not work and can work only by being electrified again, so that the chip damage caused by the short circuit is effectively protected.
In the embodiment of the utility model, based on the switching characteristic of the NPN triode and the switching characteristic of the buck chip Q200, when the output voltage is short-circuited, the disconnection of the fifth pin 5 of the buck chip Q200 is controlled by utilizing the non-conduction of the fifth pin 5 of the buck chip Q200, so that the chip does not work, and the chip damage caused by the short circuit is effectively protected.
In an embodiment of the present utility model, an electronic device is further provided, where the electronic device includes a short-circuit protection circuit in the embodiment shown in fig. 1 or fig. 2.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the utility model and are described in detail herein without thereby limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.
Claims (6)
1. A short-circuit protection circuit, the short-circuit protection circuit comprising:
the circuit comprises a filtering unit, a switching unit, a protection circuit and an output circuit;
the filter unit is connected with the switch unit, the switch unit is connected with the output circuit, and the protection circuit is respectively connected with the filter unit, the switch unit and the output circuit;
the switch unit is used for being disconnected when the output circuit is short-circuited, so that the output circuit stops working;
the filtering unit is used for providing time for the switching unit to establish a working mode;
the protection circuit is used for being disconnected when the output circuit is short-circuited, so that the switch unit is disconnected;
the output circuit is used for outputting voltage;
the filtering unit includes: a first resistor and a first capacitor;
one end of the first resistor is a voltage input end, and the voltage input end is connected with the switch unit;
the other end of the first resistor is connected with one end of the first capacitor and the protection circuit respectively;
the other end of the first capacitor is connected with the protection circuit;
the switching unit includes: a buck chip;
the first pin of the voltage reduction chip is connected with the voltage input end of the first resistor, the fifth pin of the voltage reduction chip is respectively connected with the protection circuit, and one end of the first resistor connected with the first capacitor;
the protection circuit includes:
a second resistor and a triode; the second resistor is connected with the triode in series;
one end of the second resistor is connected with one end of the first resistor and the fifth pin respectively; the other end of the second resistor is connected with the first interface end of the triode;
the second interface end of the triode is connected with the output circuit; the second interface end of the triode is grounded with a circuit connected with the output circuit; and the third interface end of the triode is connected with the output circuit.
2. The short-circuit protection circuit according to claim 1, wherein the switching unit further comprises:
an inductor and a diode;
the second pin of the voltage reduction chip is respectively connected with one end of the diode and one end of the inductor; the third pin of the buck chip is respectively connected with the other end of the diode and the output circuit, and is grounded; and a fourth pin of the voltage reduction chip is respectively connected with the other end of the inductor and the output circuit.
3. The short-circuit protection circuit of claim 1, wherein the output circuit comprises:
a second capacitor, a third resistor and a fourth resistor;
one end of the second capacitor is connected with one end of the diode; the other end of the second capacitor is connected with one end of the inductor and one end of the third resistor respectively; one end of the third resistor, which is connected with the second capacitor, is a voltage output end;
the other end of the third resistor is connected with the third interface end and one end of the fourth resistor respectively; the other end of the fourth resistor is connected with the second interface end.
4. The short-circuit protection circuit of claim 1, wherein:
one end of the second resistor, which is connected with the fifth pin, is connected with one end of the fifth resistor;
the other end of the fifth resistor is connected with the second interface end.
5. The short-circuit protection circuit of claim 1, wherein:
the voltage input end is connected with one end of a third capacitor, and the other end of the third capacitor is grounded.
6. An electronic device comprising the short-circuit protection circuit according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221744766.7U CN219643580U (en) | 2022-07-07 | 2022-07-07 | Short-circuit protection circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221744766.7U CN219643580U (en) | 2022-07-07 | 2022-07-07 | Short-circuit protection circuit and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219643580U true CN219643580U (en) | 2023-09-05 |
Family
ID=87818947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221744766.7U Active CN219643580U (en) | 2022-07-07 | 2022-07-07 | Short-circuit protection circuit and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219643580U (en) |
-
2022
- 2022-07-07 CN CN202221744766.7U patent/CN219643580U/en active Active
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