CN214252481U

CN214252481U - Breakdown detection circuit of TVS (transient voltage suppressor) tube

Info

Publication number: CN214252481U
Application number: CN202022771085.7U
Authority: CN
Inventors: 叶常青; 杨亭亭; 张君胥; 李武岐
Original assignee: Shenzhen Xinwangda Intelligent Technology Co ltd
Current assignee: Shenzhen Xinwangda Intelligent Technology Co ltd
Priority date: 2020-11-24
Filing date: 2020-11-24
Publication date: 2021-09-21
Anticipated expiration: 2030-11-24

Abstract

The utility model relates to a TVS's monomer device test field discloses a breakdown detection circuit of TVS pipe, including power, switching circuit, ampere meter, voltmeter, pulse detection circuit and TVS pipe, power, switching circuit, ampere meter, TVS pipe are established ties in proper order and are formed the return circuit, the voltmeter connects in parallel at the both ends of TVS pipe, pulse detection circuit connects in parallel at the both ends of TVS pipe and with switching circuit is connected; after the power supply is turned on and the switching circuit is closed, the switching circuit is controlled to be switched off when the pulse detection circuit detects that a current pulse signal is generated in the loop. The utility model provides a circuit can solve and cause the difficult problem that is surveyed the sample and burns out when puncturing with traditional test method test secondary, realizes the accurate detection to TVS pipe secondary puncture, and can not cause the burning out of being surveyed the sample, reaches the purpose to being surveyed sample nondestructive test and repeatability test.

Description

Breakdown detection circuit of TVS (transient voltage suppressor) tube

Technical Field

The utility model relates to a TVS's monomer device test field, in particular to breakdown detection circuitry of TVS pipe.

Background

For single device verification of TVS, at present, no good mode is available for testing secondary breakdown, devices are often burnt due to instantaneous large current in the testing process, the voltage and current values during secondary breakdown cannot be accurately measured, and the measuring precision cannot be guaranteed.

The conventional test method is to directly connect the TVS tube to two ends of a power supply for testing, and the test method is easy to cause that the tested sample is directly burnt out due to overlarge current after the tested sample is subjected to secondary breakdown, the test cannot be repeatedly carried out, the test result cannot be reproduced, and the test accuracy is not high.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a breakdown detection circuitry of TVS pipe can solve and cause the difficult problem that the sample that is surveyed burns out when puncturing with traditional test method test secondary, realizes the accurate detection to TVS pipe secondary puncture, and can not cause the burning out of the sample that is surveyed, reaches the purpose to the sample nondestructive test that is surveyed and repeatability tests.

The utility model provides a breakdown detection circuit of TVS pipe, including power, switch circuit, ampere meter, voltmeter, pulse detection circuit and TVS pipe, power, switch circuit, ampere meter, TVS pipe are established ties in proper order and are formed the return circuit, the voltmeter connects in parallel at the both ends of TVS pipe, pulse detection circuit connects in parallel at the both ends of TVS pipe and with switch circuit is connected;

after the power supply is turned on and the switching circuit is closed, the switching circuit is controlled to be switched off when the pulse detection circuit detects that a current pulse signal is generated in the loop.

Further, the switch circuit is a metal oxide semiconductor field effect transistor.

Furthermore, the positive electrode of the power supply is connected with the drain electrode of the metal-oxide-semiconductor field effect transistor, the source electrode of the metal-oxide-semiconductor field effect transistor is connected with the input end of the TVS tube through the ammeter, the output end of the TVS tube is connected with the negative electrode of the power supply, the voltmeter is connected in parallel between the input end and the output end of the TVS tube, the input port of the pulse detection circuit is connected with the input end of the TVS tube, and the output port of the pulse detection circuit is connected with the drain electrode of the metal-oxide-semiconductor field effect transistor.

Further, the power supply is an adjustable power supply module.

Further, the TVS device further comprises a resistor R1, wherein the resistor R1 is a current limiting resistor, and the resistor R1 is connected between the output end of the TVS tube and the negative pole of the power supply in series.

Further, a resistor R2 is included, and the resistor R2 is connected between the gate and the source of the MOSFET.

Further, the switching circuit is a flip-flop or a switch.

The utility model also provides another breakdown detection circuit of TVS pipe, including power, switch circuit, voltmeter, resistance, pulse detection circuit and TVS pipe, power, switch circuit, TVS pipe, resistance are established ties in proper order and are formed the return circuit, the voltmeter connects in parallel at the both ends of resistance, pulse detection circuit connects in parallel at the both ends that TVS pipe and resistance are established ties and with switch circuit connection;

after the power supply is turned on and the switch circuit is closed, the voltmeter detects the voltages at two ends of the resistor, the current in the loop is obtained through ohm's law calculation, and when the pulse detection circuit detects that a current pulse signal is generated in the loop, the switch circuit is controlled to be turned off.

The utility model provides an among the breakdown detection circuitry of TVS pipe, the power provides variable voltage and electric current for whole circuit, and MOSFET Q1 in the circuit plays the effect of switch, exports low level at once when pulse detection circuitry detects the pulse current that the secondary broke down caused, and MOSFET Q1 cuts off, makes whole test circuit break off immediately, can avoid the return circuit current to continue to increase and cause the burnout of being surveyed the sample; meanwhile, a voltmeter and an ammeter in the circuit can immediately record the voltage and current values at the moment of pulse current occurrence, so that the purpose of detecting secondary breakdown is achieved; after the circuit is reset, the test can continue to be repeated.

Drawings

Fig. 1 is a circuit block diagram of an embodiment of the present invention;

fig. 2 is a schematic circuit diagram of an embodiment of the present invention;

fig. 3 is a circuit block diagram of another embodiment of the present invention.

In the figure, a power supply 1, a switch circuit 2, an ammeter 3, a TVS tube 4, a voltmeter 5, a pulse detection circuit 6 and a resistor 7.

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, the utility model provides a breakdown detection circuit of TVS pipe, including power 1, switch circuit 2, ampere meter 3, voltmeter 5, pulse detection circuit 6 and TVS pipe 4, power 1, switch circuit 2, ampere meter 3, TVS pipe 4 establish ties in proper order and form the return circuit, voltmeter 5 connects in parallel at the both ends of TVS pipe 4, pulse detection circuit 6 connects in parallel at the both ends of TVS pipe 4 and is connected with switch circuit 2;

wherein, power 1 opens, when the voltage at TVS pipe 4 both ends surpassed normal operating voltage, pulse detection circuitry 6 is through the pulse signal of real-time detection TVS pipe 4 with the disconnection of control switch circuit 2.

In one embodiment, as shown in fig. 2, the switch circuit 2 is a mosfet.

In this embodiment, the switch circuit 2 may be a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) or a triode, and in this embodiment, the Metal Oxide Semiconductor Field Effect Transistor (MOSFET) is taken as an example, and is denoted as Q1, and functions as a switch in the circuit to control the on and off of the whole circuit, in fig. 1, G is a gate, S is a source, D is a drain, and under normal conditions, D, S of Q1 is in a conducting state.

In one embodiment, the positive electrode of the power supply 1 is connected to the drain of the mosfet, the source of the mosfet is connected to the input terminal of the TVS tube 4 through the ammeter 3, the output terminal of the TVS tube 4 is connected to the negative electrode of the power supply 1, the voltmeter 5 is connected in parallel between the input terminal and the output terminal of the TVS tube 4, the input port of the pulse detection circuit 6 is connected to the input terminal of the TVS tube 4, and the output port of the pulse detection circuit 6 is connected to the drain of the mosfet.

IN this embodiment, as shown IN fig. 1, the input end of the TVS tube 4 is the point a, and the output end is the input port (PLUS IN) of the point B pulse detection circuit 6 to detect the pulse signal at the point a. The voltage at two ends of the TVS tube presents a high-resistance state under normal working voltage, the current of the whole circuit loop is very small, generally at uA (microampere) level or even nA (nanoamp) level, at this time, the output port (OUT) of the pulse detection circuit 6 is always at high level, and Q1 is conducted; when the voltage at the two ends of the TVS tube exceeds the normal working voltage of the TVS tube and reaches the secondary breakdown voltage, the TVS tube is broken down, the current IN the circuit is increased instantly, the PLUS IN detection port of the pulse detection circuit 6 can detect the pulse signal at the point A acutely, once the pulse signal is detected, the OUT port of the pulse detection circuit 6 can output a low level immediately, and at the moment, the Q1 is turned off to cut off the voltage at the two ends of the TVS tube and the current IN the loop of the TVS tube IN time so as to prevent the TVS from being burnt due to the fact that the current continues to be increased, thereby achieving the purpose of measuring the secondary breakdown and not burning the sample; after resetting the pulse detection circuit 6, the test can be restarted.

Voltmeter 5 and ammeter 3 monitor the voltage at two ends of the TVS and the current in the loop in real time, and provide voltage and current data for secondary breakdown.

In one embodiment, the power supply 1 is an adjustable power supply module, which provides a variable voltage and current for the whole circuit, and as the voltage of the power supply 1 gradually increases, the voltage at the two ends of the TVS also increases, and after the voltage reaches a certain degree, the TVS enters a secondary breakdown state.

In one embodiment, the breakdown detection circuit of the TVS tube further includes a resistor R1, the resistor R1 is a current limiting resistor, and the resistor R1 is connected in series between the negative electrodes of the power supply 1 and the output terminal of the TVS tube 4.

In one embodiment, the breakdown detection circuit of the TVS transistor further includes a resistor R2, wherein the resistor R1 is connected between the gate and the source of the mosfet Q1 for increasing the on and off time of the mosfet Q1.

In one embodiment, the switching circuit 2 is a flip-flop, a switch, or other means, and achieves the purpose of cutting off the voltage and current.

As shown in fig. 3, the utility model also provides a breakdown detection circuit of TVS pipe, including power 1, switch circuit 2, voltmeter 5, resistance 7, pulse detection circuit 6 and TVS pipe 4, power 1, switch circuit 2, TVS pipe 4, resistance 7 establish ties in proper order and form the return circuit, voltmeter 5 connects in parallel at the both ends of resistance 7, pulse detection circuit 6 connects in parallel at the both ends that TVS pipe 4 and resistance 7 establish ties and with switch circuit 2 is connected;

after the power supply 1 is switched on and the switch circuit 2 is switched off, the voltmeter 5 detects the voltages at two ends of the resistor 7, the current in the loop is obtained through ohm's law calculation, and when the pulse detection circuit 6 detects that a current pulse signal is generated in the loop, the switch circuit 2 is controlled to be switched off.

The detection method comprises the following steps: the voltage at the two ends of the resistor 7 is detected by using the voltmeter 5, the current in the loop and the voltage at the two ends of the TVS tube 4 are obtained by calculation according to the ohm law I ═ U/R, and the purpose of controlling the switch circuit 2 is realized through the obtained change of the voltage at the two ends of the TVS tube 4.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, apparatus, article, or method that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, apparatus, article, or method. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, apparatus, article, or method that includes the element.

The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the same way in the protection scope of the present invention.

Claims

1. The utility model provides a breakdown detection circuitry of TVS pipe, its characterized in that, includes power, switch circuit, ampere meter, voltmeter, pulse detection circuitry and TVS pipe, power, switch circuit, ampere meter, TVS pipe are established ties in proper order and are formed the return circuit, the voltmeter connects in parallel the both ends of TVS pipe, pulse detection circuitry connects in parallel the both ends of TVS pipe and with switch circuit connects, pulse detection circuitry is used for detecting the current pulse signal that produces in the return circuit, and is used for control the switch circuit disconnection.

2. The breakdown detection circuit of TVS transistor of claim 1, wherein said switch circuit is a mosfet.

3. The breakdown detection circuit of TVS transistor of claim 2, wherein the positive terminal of the power supply is connected to the drain of the mosfet, the source of the mosfet is connected to the input terminal of the TVS transistor through the current meter, the output terminal of the TVS transistor is connected to the negative terminal of the power supply, the voltage meter is connected in parallel between the input terminal and the output terminal of the TVS transistor, the input port of the pulse detection circuit is connected to the input terminal of the TVS transistor, and the output port of the pulse detection circuit is connected to the drain of the mosfet.

4. The breakdown detection circuit of TVS tube of claim 1, wherein said power supply is an adjustable power supply module.

5. The breakdown detection circuit of TVS transistor of claim 3, further comprising a resistor R1, wherein said resistor R1 is a current limiting resistor, and said resistor R1 is connected in series between the output terminal of said TVS transistor and the negative terminal of said power supply.

6. The breakdown detection circuit of TVS tube of claim 3, further comprising a resistor R2, wherein said resistor R2 is connected between the gate and the source of said MOSFET.

7. The breakdown detection circuit of TVS tube of claim 1, wherein said switching circuit is a flip-flop or a switch.

8. The utility model provides a breakdown detection circuitry of TVS pipe, its characterized in that, includes power, switching circuit, voltmeter, resistance, pulse detection circuitry and TVS pipe, power, switching circuit, TVS pipe, resistance are established ties in proper order and are formed the return circuit, the voltmeter connects in parallel the both ends of resistance, the voltmeter is used for the voltage at detection resistance both ends, pulse detection circuitry connects in parallel TVS pipe and resistance both ends of establishing ties and with switching circuit connects, pulse detection circuitry is used for detecting the current pulse signal that produces in the return circuit, and be used for control switching circuit disconnection.