CN215990204U - Protection device for preventing circuit surge - Google Patents
Protection device for preventing circuit surge Download PDFInfo
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- CN215990204U CN215990204U CN202121465976.8U CN202121465976U CN215990204U CN 215990204 U CN215990204 U CN 215990204U CN 202121465976 U CN202121465976 U CN 202121465976U CN 215990204 U CN215990204 U CN 215990204U
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Abstract
The utility model relates to a circuit anti-surge protection device, which comprises a power supply, a control circuit, a switch circuit and a power-on circuit, wherein the output end of the power supply is connected with the input end of the power-on circuit; the control end of the control circuit is connected with the controlled end of the power-on circuit through the switch circuit and controls the power-on circuit, and the power supply voltage of the power-on circuit to the product to be tested is gradually increased from zero to rated voltage. The protection device for preventing the circuit from the surge is characterized in that a power-on circuit is arranged between a product to be tested and a power supply, and the power-on circuit is controlled by a control circuit and a switch circuit. When a product to be tested needs to be tested, the power supply voltage is gradually increased through the power-on circuit so as to reach the rated voltage of the product to be tested. The device avoids the surge at the moment of electrifying, and protects the product to be tested from being damaged by the large voltage at the moment.
Description
Technical Field
The utility model relates to the technical field of electronic product testing, in particular to a protection device for preventing a circuit from surge.
Background
The electronic product is a related product based on electric energy, and mainly comprises: watch, smartphone, phone, television, etc. After the electronic product is manufactured and assembled, the performance of the electronic product generally needs to be tested to detect whether each function of the electronic product is normal. When a product is tested, the product needs to be powered, and in the prior art, the product is directly powered on without any protection measures. However, the power supply will generate a surge at the moment of starting to supply power, and the instantaneous high voltage will easily damage the tested product, causing unnecessary loss. Therefore, how to perform power-on protection on a product to be tested is a problem to be solved urgently at present.
SUMMERY OF THE UTILITY MODEL
Therefore, it is necessary to provide a protection device for preventing circuit surge to solve the problem that the existing product to be tested is easily damaged by surge voltage when being electrified.
A circuit anti-surge protection device comprises a power supply, a control circuit, a switch circuit and a power-on circuit, wherein the output end of the power supply is connected with the input end of the power-on circuit, and the output end of the power-on circuit is connected with the power end of a product to be tested; the control end of the control circuit is connected with the controlled end of the power-on circuit through the switch circuit and controls the power-on circuit, and the power supply voltage of the power-on circuit to the product to be tested is gradually increased from zero to rated voltage.
Further, the power-up circuit includes a plurality of output voltage steps.
Furthermore, the power supply voltage of the power-on circuit to the product to be tested is gradually increased from zero step to rated voltage.
Furthermore, the power-on circuit comprises a booster circuit and an anti-surge resistor, and the booster circuit comprises a booster subunit and a first capacitor;
the output end of the booster subunit is connected with the first end of the anti-surge resistor, the second end of the anti-surge resistor is connected with the anode of the first capacitor, the connection node of the anti-surge resistor is the output end of the power-on circuit, and the cathode of the first capacitor is grounded.
Further, the anti-surge resistor is a negative temperature coefficient thermistor.
Further, the boost subunit includes a boost chip, and a controlled end of the boost chip is connected with a control end of the control circuit.
Furthermore, the control circuit comprises an MCU chip and a peripheral circuit thereof, and the switch circuit comprises an MOS tube; and the control end of the MCU chip controls the switch of the MOS tube so as to control the switch of the power-on circuit.
Furthermore, the circuit surge protection device also comprises a temperature sensor, wherein a probe of the temperature sensor is arranged in a product to be tested, and the output end of the temperature sensor is connected with the input end of the control circuit; when the temperature sensor detects that the product to be tested is over-temperature, the control circuit controls the power-on circuit to cut off power supply to the product to be tested.
According to the technical scheme, the power-on circuit is arranged between the product to be tested and the power supply, and is controlled by the control circuit and the switch circuit. When a product to be tested needs to be tested, the power supply voltage is gradually increased through the power-on circuit so as to reach the rated voltage of the product to be tested. The device avoids the surge at the moment of electrifying, and protects the product to be tested from being damaged by the large voltage at the moment.
Drawings
Fig. 1 is a schematic connection structure diagram of an embodiment of a protection device for preventing a circuit surge according to the present invention;
fig. 2 is a schematic structural connection diagram of an embodiment of the power-up circuit shown in fig. 1.
In the drawings, the components represented by the respective reference numerals are listed below:
1. a power supply; 2. a control circuit; 3. a switching circuit; 4. a product to be tested; 5. a power-up circuit; 51. A booster subunit; 52. a first capacitor; 53. an anti-surge resistor; 6. a temperature sensor.
Detailed Description
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It is apparent that the specific details set forth in the following description are merely exemplary of the utility model, which can be practiced in many other embodiments that depart from the specific details disclosed herein. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any inventive step, are within the scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.
In an embodiment, please refer to fig. 1 and fig. 2, an embodiment of the present invention provides a protection device for preventing a circuit from surge, including a power supply 1, a control circuit 2, a switch circuit 3, and a power-up circuit 5, wherein an output terminal of the power supply 1 is connected to an input terminal of the power-up circuit 5, and an output terminal of the power-up circuit 5 is connected to a power terminal of a product 4 to be tested; the control end of the control circuit 2 is connected with the controlled end of the power-on circuit 5 through the switch circuit 3, and controls the power-on circuit 5, and the power supply voltage of the power-on circuit 5 to the product 4 to be tested is gradually increased from zero to the rated voltage.
According to the technical scheme of the utility model, a power-on circuit 5 is arranged between a product 4 to be tested and a power supply, and the power-on circuit 5 is controlled by a control circuit 2 and a switch circuit 3. When the product 4 to be tested needs to be tested, the power supply voltage is gradually increased through the power-on circuit 5 so as to reach the rated voltage of the product 4 to be tested. The device avoids the surge at the moment of electrifying, and protects the product 4 to be tested from being damaged by the large voltage at the moment.
On the basis of the present embodiment, further, the power-on circuit 5 includes a plurality of output voltage steps. Further, the power supply voltage of the power-on circuit 5 to the product 4 to be tested is gradually increased from zero step to the rated voltage.
It can be understood that, when the device is used, the voltage is gradually increased from a low level to a high level through a plurality of voltage levels set by the power-on circuit 5, so that the damage to the product 4 to be tested caused by the instantaneous increase of the voltage is avoided. Of course, the power-up circuit 5 may also increase linearly in steps up to the rated voltage, which form is not described as a limitation in the present embodiment.
In the present embodiment, the power-on circuit 5 includes a voltage boosting circuit and an anti-surge resistor 53, where the voltage boosting circuit includes a voltage boosting subunit 51 and a first capacitor 52; the output end of the voltage boosting subunit 51 is connected with the first end of the surge-preventing resistor 53, the second end of the surge-preventing resistor 53 is connected with the anode of the first capacitor 52, the connection node is the output end of the power-on circuit 5, and the cathode of the first capacitor 52 is grounded. Further, the surge prevention resistor 53 is a negative temperature coefficient thermistor. Furthermore, the boost subunit comprises a boost chip, and a controlled end of the boost chip is connected with a control end of the control circuit.
It can be understood that the surge protection function of the device is further improved by the circuit, and of course, the circuit structure may also be in other forms, which are not described as limitations in this embodiment.
On the basis of the embodiment, further, the control circuit 2 includes an MCU chip and its peripheral circuits, and the switch circuit 3 includes an MOS transistor; the control end of the MCU chip controls the switch of the MOS tube, and further controls the switch of the power-on circuit 5.
Furthermore, the circuit surge protection device also comprises a temperature sensor 6, a probe of the temperature sensor 6 is arranged in the product 4 to be tested, and the output end of the temperature sensor 6 is connected with the input end of the control circuit; when the temperature sensor 6 detects that the product 4 to be tested is over-temperature, the control circuit controls the power-on circuit 5 to cut off the power supply to the product 4 to be tested.
When the temperature sensor is used, if the product to be tested 4 is over-temperature, the over-temperature phenomenon can be detected by the temperature sensor 6 in time, the control circuit 2 closes the power-on circuit 5 through the switch circuit 3, and then the power supply of the product to be tested 4 is cut off. The product 4 to be tested is protected from burning out in time. Protect the product, also protected the life safety of tester.
Certainly, an overvoltage detection circuit, an overcurrent detection circuit and the like can be arranged on the product 4 to be tested and connected with the control circuit 2, so that when the product 4 to be tested emits overvoltage, overcurrent and other conditions, power supply can be timely cut off to protect the product.
Of course, the power-up circuit 5 can also be implemented by other solutions, for example, by means of a stepped power supply by the power supply of the type E3631A by Keysight. The structural form is not described as a limitation in the embodiment.
According to the technical scheme, the product 4 to be tested is subjected to anti-surge protection in a stepped power-on mode, and the method is simple, effective and cost-saving.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the utility model. It should be noted that, for those skilled in the art, various changes, substitutions and alterations can be made without departing from the spirit and scope of the utility model. Therefore, the protection scope of the present invention should be subject to the claims.
Claims (8)
1. A protection device for preventing a circuit from surge, comprising: the power supply comprises a power supply source, a control circuit, a switch circuit and a power-on circuit, wherein the output end of the power supply source is connected with the input end of the power-on circuit, and the output end of the power-on circuit is connected with the power end of a product to be tested; the control end of the control circuit is connected with the controlled end of the power-on circuit through the switch circuit and controls the power-on circuit, and the power supply voltage of the power-on circuit to the product to be tested is gradually increased from zero to rated voltage.
2. The device of claim 1, wherein the power-up circuit comprises a plurality of output voltage steps.
3. The device according to claim 2, wherein the supply voltage of the power-on circuit to the product under test is gradually increased from zero step to the rated voltage.
4. The protection device for preventing the circuit from the surge according to claim 1, wherein the power-on circuit comprises a voltage boost circuit and an anti-surge resistor, the voltage boost circuit comprises a voltage boost subunit and a first capacitor;
the output end of the booster subunit is connected with the first end of the anti-surge resistor, the second end of the anti-surge resistor is connected with the anode of the first capacitor, the connection node of the anti-surge resistor is the output end of the power-on circuit, and the cathode of the first capacitor is grounded.
5. The device according to claim 4, wherein the anti-surge resistor is a negative temperature coefficient thermistor.
6. The device according to claim 4, wherein the boost sub-unit comprises a boost chip, and a controlled terminal of the boost chip is connected to a control terminal of the control circuit.
7. The protection device for preventing the circuit from the surge according to claim 1, wherein the control circuit comprises an MCU chip and peripheral circuits thereof, and the switch circuit comprises an MOS (metal oxide semiconductor) transistor; and the control end of the MCU chip controls the switch of the MOS tube so as to control the switch of the power-on circuit.
8. The circuit surge protection device according to claim 1, further comprising a temperature sensor, wherein a probe of the temperature sensor is disposed in a product to be tested, and an output end of the temperature sensor is connected to an input end of the control circuit; when the temperature sensor detects that the product to be tested is over-temperature, the control circuit controls the power-on circuit to cut off power supply to the product to be tested.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121465976.8U CN215990204U (en) | 2021-06-29 | 2021-06-29 | Protection device for preventing circuit surge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121465976.8U CN215990204U (en) | 2021-06-29 | 2021-06-29 | Protection device for preventing circuit surge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215990204U true CN215990204U (en) | 2022-03-08 |
Family
ID=80578695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121465976.8U Active CN215990204U (en) | 2021-06-29 | 2021-06-29 | Protection device for preventing circuit surge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215990204U (en) |
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2021
- 2021-06-29 CN CN202121465976.8U patent/CN215990204U/en active Active
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