CN113595045A - Protection circuit and device for electric endurance test - Google Patents
Protection circuit and device for electric endurance test Download PDFInfo
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- CN113595045A CN113595045A CN202110806109.4A CN202110806109A CN113595045A CN 113595045 A CN113595045 A CN 113595045A CN 202110806109 A CN202110806109 A CN 202110806109A CN 113595045 A CN113595045 A CN 113595045A
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- 238000005070 sampling Methods 0.000 claims description 22
- 101100365087 Arabidopsis thaliana SCRA gene Proteins 0.000 claims description 17
- 101150105073 SCR1 gene Proteins 0.000 claims description 17
- 101100134054 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) NTG1 gene Proteins 0.000 claims description 17
- 239000003990 capacitor Substances 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims 2
- 230000001960 triggered effect Effects 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Tests Of Electronic Circuits (AREA)
Abstract
The invention relates to an over-current limiting protection device, and discloses a protection circuit and a device for an electric endurance test, wherein the protection circuit comprises an interface module, the interface module is provided with 3 interfaces, and the protection circuit is characterized by also comprising a switch module and a protection module; one end of the interface module is connected with an external input end, a third port of the interface module is grounded, a second port of the interface module is connected with the protection module, a first port of the interface module is connected with the switch module, the protection module receives current of the external input end, and when the received current exceeds a threshold value, the protection module is conducted, so that the switch module is triggered to be conducted; the protection circuit designed by the invention is simple in design, can quickly cut off overcurrent current within 50ms, and is beneficial to analyzing the performance of a device.
Description
Technical Field
The invention relates to an over-current limiting protection device, in particular to a protection circuit and a protection device for an electric endurance test.
Background
At present, the cut-off overrun current in the reliability experiment equipment is mainly cut off by a relay after fuse fusing or single chip microcomputer detection. The two current methods have the defect of slow cut-off time: the fuse fusing requirement and the current detection period of the single chip microcomputer are generally more than 2s, and the test device can be seriously damaged in the time, so that the performance analysis of the device is not facilitated.
For example, the patent name, a current overrun detection device; patent application No.: CN 201820168886.4; the application date is: 2018-08-17; the patent describes a current overrun detection device, including: power supply unit, data acquisition circuit, intelligent contactor, singlechip, display device. The power supply device supplies power to the single chip microcomputer, the intelligent contactor is connected in the main circuit, the data acquisition circuit and the display device are respectively connected with the single chip microcomputer, and a control signal end of the single chip microcomputer is connected with the intelligent contactor to conduct or shut off a switch of the intelligent contactor; the display device is connected with the single chip microcomputer and displays the current acquired by the data acquisition circuit in real time.
In the prior art, signals of over-current limit need to be detected through a single chip microcomputer and then controlled, so that the response efficiency is low, and the performance analysis of devices is influenced. .
Disclosure of Invention
The invention provides a protection circuit and a device for an electric endurance test, aiming at the defects that in the prior art, an over-current-limiting signal needs to be detected by a single chip microcomputer and then controlled, the response efficiency is low, and the performance analysis of a device is influenced.
In order to solve the technical problem, the invention is solved by the following technical scheme:
a protection circuit for an electric endurance test comprises an interface module, a switch module and a protection module, wherein the interface module is provided with 3 interfaces; interface module one end and external input end, interface module's third port ground connection, interface module's second port and protection module are connected, and interface module's first port is connected with the switch module, and protection module receives the electric current of external input end, and then protection module switches on when the electric current of receiving surpasss the threshold value to trigger the switch module and switch on.
The protection circuit is simple in design and can be well applied to reliability test equipment.
Preferably, the protection module comprises a resistor R2, a diode V2, a capacitor C2 and a resistor R3; the resistor R2 and the diode V2 are connected in series to form a first protection unit, the capacitor C2 and the resistor R3 are connected in parallel to form a second protection unit, and the first protection unit is connected with the second protection unit in series.
Preferably, the switching module comprises a diode V1 and a diode SCR 1; the diode V1 is connected in series with the diode SCR1, and the diode SCR1 is connected with the first protection unit.
Preferably, diode V2 is a zener diode and diode SCR1 is a thyristor rectifier diode. The input current is protected by the zener diode, and when a set threshold value is exceeded, the zener diode is turned on, so that the trigger diode SCR1 is turned on.
Preferably, the resistor R3 and the resistor R2 are both adjustable resistors. Through setting up adjustable resistance, can be according to the electric current that the regulation was passed through when carrying out the protection setting.
A protection device for an electric endurance test comprises the protection circuit.
Preferably, the protection circuit further comprises a controller and a current sampling module, wherein the controller is connected with a first interface of an interface module in the protection circuit; the current sampling module is connected with a second interface of the interface module in the protection circuit.
Preferably, the controller is a normally closed relay.
Preferably, the current sampling module is a sampling resistor R1.
Preferably, the sampling resistor R1 is an adjustable resistor. Due to the adoption of the technical scheme, the invention has the remarkable technical effects that:
the protection circuit is simple in design and can be well applied to reliability test equipment.
The input current is protected by the zener diode, and when a set threshold value is exceeded, the zener diode is turned on, so that the trigger diode SCR1 is turned on. .
Drawings
Fig. 1 is a diagram of a protection circuit of the present invention.
Fig. 2 is a circuit diagram of the guard of the present invention.
Fig. 3 is a circuit diagram of the guard of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1
A protection circuit for an electric endurance test comprises an interface module, a switch module and a protection module, wherein the interface module is provided with 3 interfaces; interface module one end and external input end, interface module's third port ground connection, interface module's second port and protection module are connected, and interface module's first port is connected with the switch module, and protection module receives the electric current of external input end, and then protection module switches on when the electric current of receiving surpasss the threshold value to trigger the switch module and switch on.
The protection circuit is simple in design and can be well applied to reliability test equipment.
The protection module comprises a resistor R2, a diode V2, a capacitor C2 and a resistor R3; the resistor R2 and the diode V2 are connected in series to form a first protection unit, the capacitor C2 and the resistor R3 are connected in parallel to form a second protection unit, and the first protection unit is connected with the second protection unit in series.
The switch module includes a diode V1 and a diode SCR 1; the diode V1 is connected in series with the diode SCR1, and the control electrode of the diode SCR1 is connected to the first protection unit.
Diode V2 is a zener diode and diode SCR1 is a thyristor rectifier diode. The input current is protected by the zener diode, and when a set threshold value is exceeded, the zener diode is turned on, so that the trigger diode SCR1 is turned on.
The resistor R3 and the resistor R2 are adjustable resistors. Through setting up adjustable resistance, can be according to the electric current that the regulation was passed through when carrying out the protection setting.
Example 2
On the basis of embodiment 1, the protection device for electric endurance test of this embodiment includes the protection circuit.
Example 3
On the basis of the above embodiment, the present embodiment further includes a controller and a current sampling module, where the controller is connected to the first interface of the interface module in the protection circuit; the current sampling module is connected with a second interface of the interface module in the protection circuit.
Example 4
On the basis of the above embodiments, the controller of the present embodiment is a normally closed relay.
Example 5
On the basis of the above embodiments, the current sampling module of the present embodiment is a sampling resistor R1. The sampling resistor R1 is an adjustable resistor.
Example 6
On the basis of the above embodiment, when the test circuit is turned on in this embodiment, both ends of the control coil of the normally closed relay are 12V, and the voltage on the sampling resistor is between 0V and 2.5V. When the current exceeds the upper sampling limit and the voltage on the sampling resistor reaches more than 3.5V, the pins 1 and 3 of the protection module conduct the coil of the relay, and the normally closed relay is switched off. At this moment, the circuit is disconnected, the voltage on the sampling resistor drops to 0, the pins 1 and 3 of the module are continuously conducted, and the normally closed relay can keep a cut-off state. The current flows through contacts 2 and 7 and the current sampling resistor R1 goes to GND. The control pin voltage of the SCR1 is now raised, causing the SCR1 to turn on. The relay coil, V1, SCR1 are connected in series in a 12V circuit. The sampling resistor, the relay switch and the DUT are connected in series, so that the currents are the same; no current passes in R1 and the voltage becomes 0.
According to fig. 3, the zener diode is a 3V zener diode; when the current flowing through the sampling resistor R1 exceeds 3.5V, the voltage stabilizing diode is conducted; therefore, the diode SCR1 is triggered to be conducted, and after the diode SCR1 is conducted, the closing coil is electrified, so that the relay is disconnected, and the DUT is subjected to over-current protection.
Claims (10)
1. A protection circuit for an electric endurance test comprises an interface module, wherein the interface module is provided with 3 interfaces and is characterized by further comprising a switch module and a protection module; interface module one end and external input end, interface module's third port ground connection, interface module's second port and protection module are connected, and interface module's first port is connected with the switch module, and protection module receives the electric current of external input end, and then protection module switches on when the electric current of receiving surpasss the threshold value to trigger the switch module and switch on.
2. The protection circuit for electric endurance test of claim 1, wherein the protection module comprises a resistor R2, a diode V2, a capacitor C2 and a resistor R3; the resistor R2 and the diode V2 are connected in series to form a first protection unit, the capacitor C2 and the resistor R3 are connected in parallel to form a second protection unit, and the first protection unit is connected with the second protection unit in series.
3. The protection circuit for electric endurance test of claim 2, wherein the switching module includes a diode V1 and a diode SCR 1; the diode V1 is connected in series with the diode SCR1, and the diode SCR1 is connected with the first protection unit.
4. The protection circuit for electric endurance test of claim 3, wherein diode V2 is a zener diode and diode SCR1 is a SCR diode.
5. The protection circuit for electric endurance test of claim 3, wherein the resistor R3 and the resistor R2 are both adjustable resistors.
6. A protective device for electrical endurance tests, comprising a protection circuit according to any of claims 1 to 5.
7. The protection device for the electric endurance test of claim 6, further comprising a controller and a current sampling module, wherein the controller is connected with the first interface of the interface module in the protection circuit; the current sampling module is connected with a second interface of the interface module in the protection circuit.
8. The protective device for electric endurance testing of claim 7, in which the controller is a normally closed relay.
9. The protection device for the electric endurance test of claim 7, wherein the current sampling module is a sampling resistor R1.
10. The protection device for the electric endurance test of claim 7, wherein the sampling resistor R1 is an adjustable resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110806109.4A CN113595045A (en) | 2021-07-16 | 2021-07-16 | Protection circuit and device for electric endurance test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110806109.4A CN113595045A (en) | 2021-07-16 | 2021-07-16 | Protection circuit and device for electric endurance test |
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| Publication Number | Publication Date |
|---|---|
| CN113595045A true CN113595045A (en) | 2021-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110806109.4A Pending CN113595045A (en) | 2021-07-16 | 2021-07-16 | Protection circuit and device for electric endurance test |
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| CN (1) | CN113595045A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2313320Y (en) * | 1997-12-18 | 1999-04-07 | 钟理彰 | Electronic over-current protector |
| KR20160114797A (en) * | 2015-03-24 | 2016-10-06 | 대성전기공업 주식회사 | Electronic Switching Device |
| CN206225983U (en) * | 2016-11-07 | 2017-06-06 | 广东美的制冷设备有限公司 | Over-voltage over-current protection circuit |
| CN107658843A (en) * | 2017-10-23 | 2018-02-02 | 江西美的贵雅照明有限公司 | Overvoltage crowbar and light fixture |
| CN112653082A (en) * | 2020-11-27 | 2021-04-13 | 凯迈（洛阳）测控有限公司 | Intelligent overcurrent protection module |
-
2021
- 2021-07-16 CN CN202110806109.4A patent/CN113595045A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2313320Y (en) * | 1997-12-18 | 1999-04-07 | 钟理彰 | Electronic over-current protector |
| KR20160114797A (en) * | 2015-03-24 | 2016-10-06 | 대성전기공업 주식회사 | Electronic Switching Device |
| CN206225983U (en) * | 2016-11-07 | 2017-06-06 | 广东美的制冷设备有限公司 | Over-voltage over-current protection circuit |
| CN107658843A (en) * | 2017-10-23 | 2018-02-02 | 江西美的贵雅照明有限公司 | Overvoltage crowbar and light fixture |
| CN112653082A (en) * | 2020-11-27 | 2021-04-13 | 凯迈（洛阳）测控有限公司 | Intelligent overcurrent protection module |
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Application publication date: 20211102 |