CN213633692U - Conductivity detection circuit and detection device of TVS tube - Google Patents
Conductivity detection circuit and detection device of TVS tube Download PDFInfo
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- CN213633692U CN213633692U CN202020814077.3U CN202020814077U CN213633692U CN 213633692 U CN213633692 U CN 213633692U CN 202020814077 U CN202020814077 U CN 202020814077U CN 213633692 U CN213633692 U CN 213633692U
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Abstract
The utility model relates to a semiconductor technology field, the utility model provides a continuity detection circuitry and detection device of TVS pipe. Wherein, the conductivity detection circuitry of TVS pipe includes: the positive and negative switching circuit comprises a control end and a power supply terminal, wherein the power supply terminal comprises a first power supply end and a second power supply end; the switching device is connected with the control end of the positive-negative switching circuit so as to switch the polarity of the first power supply end and the second power supply end through the control end; the detection circuit comprises a current detection device, a power connection end and a test end, wherein the power connection end is connected with a power terminal, so that when the test end is connected into the TVS tube, the conductivity of the TVS tube is determined according to a current signal in the detection circuit detected by the current detection device. The utility model discloses a conductivity detection circuitry of TVS pipe has the conductivity test of TVS pipe convenient simple and the accurate reliable advantage of test result to it is high to have efficiency of software testing, advantage that the cost of labor is low.
Description
Technical Field
The utility model relates to the field of semiconductor technology, especially, relate to continuity detection circuitry and detection device of TVS pipe.
Background
At present, a universal meter is often adopted to perform conductivity test on a TVS (Transient Voltage tester) tube, two contacts of the universal meter are respectively connected to the TVS tube to perform the conductivity test on the TVS tube in one direction, and then the two contacts of the universal meter need to be manually exchanged, namely: carry out the ascending conduction test in another side to the TVS pipe after changing the position with two contacts of universal meter, manual operation is loaded down with trivial details, and the human cost is high. Especially, when a large number of TVS tubes are to be tested, the above operations need to be repeated one by one.
Furthermore, the voltage drop across the tap of the test diode of a multimeter is typically 1.5V. However, the turn-on voltage of the damaged TVS tube is uncertain, that is: it may be lower than 1.5V or higher than 1.5V, and therefore, when the turn-on voltage of the damaged TVS tube is higher than 1.5V, it cannot be effectively tested whether the TVS tube is damaged by the multimeter.
Disclosure of Invention
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least.
Therefore, an object of the present invention is to provide a circuit for detecting conductivity of a TVS tube. The conductivity detection circuit of the TVS tube has the advantages of convenience and simplicity in conductivity test of the TVS tube, accuracy and reliability in test results, high test efficiency and low labor cost.
Another object of the present invention is to provide a detecting device.
In order to achieve the above object, a first aspect of the present invention discloses a conductivity detection circuit of a TVS tube, including: the positive and negative switching circuit comprises a control end and power supply terminals, and the power supply terminals comprise a first power supply end and a second power supply end; the switching device is connected with the control end of the positive-negative switching circuit so as to switch the polarities of the first power supply end and the second power supply end through the control end; the detection circuit comprises a current detection device, a power connection end and a test end, wherein the power connection end is connected with the power terminal, so that when the test end is connected into the TVS tube, the conductivity of the TVS tube is determined according to a current signal in the detection circuit detected by the current detection device.
Further, the positive-negative pole switching circuit includes: the base electrode of the first triode is connected with the switching device, the emitting electrode of the first triode is grounded, the collecting electrode of the first triode is connected with the collecting electrode of the second triode, the emitting electrode of the second triode is connected with the power supply, and the base electrode of the second triode is connected with one end of the first resistor; the base electrode of the third triode is connected with the switching device, the emitting electrode of the third triode is grounded, the collecting electrode of the third triode is connected with the collecting electrode of the fourth triode, the emitting electrode of the fourth triode is connected with the power supply, and the base electrode of the fourth triode is connected with one end of the second resistor; the other end of the first resistor is used as the first power supply end, the first power supply end is connected with the collector electrode of the third triode and the collector electrode of the fourth triode, the other end of the second resistor is used as the second power supply end, and the second power supply end is connected with the collector electrode of the first triode and the collector electrode of the second triode.
Further, the first triode and the third triode are NPN type triodes, and the second triode and the fourth triode are PNP type triodes.
Further, the switching device includes a switch, a first end of the switch is connected to the power supply, a second end of the switch is connected to the base of the first triode, and a third end of the switch is connected to the base of the third triode, wherein the first end and the second end of the switch are connected, the second power supply end is a positive electrode, the first power supply end is a negative electrode, the first end and the third end of the switch are connected, the first power supply end is a positive electrode, and the second power supply end is a negative electrode.
Furthermore, the power connection end of the detection circuit comprises a first power connection end and a second power connection end, the test end comprises a first test end and a second test end, the first power connection end is connected with the first power end, the second power connection end is connected with the second power end, the first test end is used for being connected with one end of the TVS tube, and the second test end is used for being connected with the other end of the TVS tube after passing through the third resistor.
Further, the current detection device includes: the anode of the first light-emitting diode is connected with the first power supply connecting end, and the cathode of the first light-emitting diode is connected with the first testing end; a second light emitting diode in anti-parallel with the first light emitting diode.
Furthermore, the TVS tube is a TVS tube on the board card, one end of the TVS tube is connected with the pin of the board card, and the other end of the TVS tube is connected with the grounding end of the board card.
Furthermore, the TVS tubes are multiple, one ends of the TVS tubes are connected with the pins of the board card in a one-to-one correspondence mode, and the other ends of the TVS tubes are connected with the grounding end of the board card.
Furthermore, a plurality of pins of the board card are connected with the first test end, and the grounding end of the board card is connected with the second test end through the third resistor.
The second aspect of the utility model discloses a detection device, include: the circuit for detecting conductivity of a TVS tube according to the first aspect.
The utility model provides an above-mentioned one or more technical scheme has one of following technological effect at least:
according to the utility model discloses an embodiment has the convenient simple and accurate reliable advantage of test result of continuity test of TVS pipe to it is high to have efficiency of software testing, advantage that the cost of labor is low.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a block diagram of a circuit for detecting conductivity of a TVS tube according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a conductivity detection circuit of a TVS tube according to an embodiment of the present invention.
Reference numerals:
110: a positive and negative switching circuit; 120: a switching device; 130: a detection circuit.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The following describes the continuity detection circuit and detection device of TVS tube according to the embodiment of the present invention with reference to the accompanying drawings.
Fig. 1 is a block diagram of a circuit for detecting conductivity of a TVS tube according to an embodiment of the present invention. As shown in fig. 1, and with reference to fig. 2, a conductivity detection circuit for TVS tube according to an embodiment of the present invention includes: positive-negative switching circuit 110, switching device 120 and detection circuit 130.
The positive-negative switching circuit 110 includes a control terminal and power terminals, and the power terminals include a first power terminal J1 and a second power terminal J2. The switching device 120 is connected to the control terminal of the positive-negative polarity switching circuit 110 to switch the polarities of the first power supply terminal J1 and the second power supply terminal J2 via the control terminal. The detection circuit 130 includes a current detection device 131, a power connection terminal 132 and a test terminal 133, wherein the power connection terminal 132 is connected to the power terminal to determine the conductivity of the TVS tube according to a current signal in the detection circuit 130 detected by the current detection device 131 when the test terminal 133 is connected to the TVS tube.
According to the utility model discloses conductivity detection circuitry of TVS pipe, positive negative pole switching circuit pass through the power supply terminal for detection circuitry and the TVS pipe power supply that links to each other with detection circuitry, when the TVS pipe switches on, have current signal in the detection circuitry, consequently, can determine TVS's conductivity through the current signal among the sense current. In addition, the polarity of the first power supply end and the polarity of the second power supply end are switched through the switching device, bidirectional conductivity detection can be carried out on the TVS, the TVS has the advantages of being comprehensive and reliable in detection, the action of manually changing the polarity is omitted, and the TVS is convenient and easy to operate.
The positive-negative electrode switching circuit 110, the switching device 120, and the detection circuit 130 according to the embodiment of the present invention are described below with specific examples.
As shown in fig. 2, in conjunction with fig. 1, the positive-negative polarity switching circuit 110 includes: the circuit comprises a first triode D1, a second triode D2, a third triode D3 and a fourth triode D4, wherein the base of the first triode D1 is connected with the switching device 120, the emitter of the first triode D1 is Grounded (GND), the collector of the first triode D1 is connected with the collector of the second triode D2, the emitter of the second triode D2 is connected with a power supply VCC, and the base of the second triode D2 is connected with one end of a first resistor.
The base of the third triode D3 is connected to the switching device 120, the emitter of the third triode D3 is grounded, the collector of the third triode D3 is connected to the collector of the fourth triode D4, the emitter of the fourth triode D4 is connected to the power source VCC, and the base of the fourth triode D4 is connected to one end of the second resistor R2.
The other end of the first resistor R1 serves as a first power supply terminal J1, the first power supply terminal J1 is connected to the collector of the third transistor D3 and the collector of the fourth transistor D4, the other end of the second resistor R2 serves as a second power supply terminal J2, and the second power supply terminal J2 is connected to the collector of the first transistor D1 and the collector of the second transistor D2.
As shown in fig. 2, in the present example, the first transistor D1 and the third transistor D3 are NPN transistors, and the second transistor D2 and the fourth transistor D4 are PNP transistors.
The positive-negative switching circuit 110 can realize the positive-negative switching of the voltages of the first power supply end J1 and the second power supply end J2, and the purpose of the positive-negative switching is to test whether the TVS tube can be switched on under the forward voltage and the reverse voltage without changing the positive-negative line of the power supply back and forth in the process of conducting a conductivity test on the TVS tube, and the voltage switching of the first power supply end J1 and the second power supply end J2 of the positive-negative switching circuit 110 can be realized only by controlling the positive-negative switching circuit 110 through the switching device 120. The method has the advantages of simple operation and comprehensive and reliable test of the TVS tube.
In one embodiment of the present invention, the switching device 120 includes a switch. As shown in fig. 2, the first terminal 1 of the switch 120 is connected to the power VCC, the second terminal 2 of the switch 120 is connected to the base of the first transistor D1, and the third terminal 3 of the switch 120 is connected to the base of the third transistor D3, in the example shown in fig. 2, after the first terminal 1 and the second terminal 2 of the switch 120 are connected, the second power terminal J2 is a positive electrode, and the first power terminal J1 is a negative electrode; when the first terminal 1 of the switch 120 is connected to the third terminal 3, the first power supply terminal J1 is positive, and the second power supply terminal J2 is negative.
In the above description, the power supply VCC is, for example, a 24V dc power supply, that is: when the first power source terminal J1 is 24V +, the second power source terminal J2 is 24V-. Similarly, when the first power source terminal J1 is 24V-, the second power source terminal J2 is 24V +.
As shown in fig. 2, in an embodiment of the present invention, the power connection end 132 of the detection circuit 130 includes a first power connection end 1321 and a second power connection end 1322, the test end 133 includes a first test end 1331 and a second test end 1332, the first power connection end 1321 is connected to the first power supply end J1, the second power connection end 1322 is connected to the second power supply end J2, the first test end 1331 is used for being connected to one end of the TVS tube, and the second test end 1332 is used for being connected to the other end of the TVS tube through the third resistor R3.
In this example, the current detection device 131 includes: a first light emitting diode D5 and a second light emitting diode D6. The anode of the first led D5 is connected to the first power connection terminal 1321, the cathode of the first led D5 is connected to the first test terminal 1331, and the second led D6 is connected in reverse parallel to the first led D5.
It should be noted that the second led D6 and the first led D5 are connected in anti-parallel: the second light emitting diode D6 is connected in parallel with the first light emitting diode D5, and the anode of the second light emitting diode D6 is connected to the cathode of the first light emitting diode D5, and the cathode of the second light emitting diode D6 is connected to the anode of the first light emitting diode D5.
Thus, the first power connection terminal 1321, the current detection device 131, and the TVS tube are connected to the second power connection terminal 1322, when a current flows into the current detection device from the first power connection terminal 1321, if the TVS tube is turned on, the current may return to the second power connection terminal 1322 after passing through the TVS tube, at this time, in the current detection device, the current passes through the first light emitting diode D5, and the first light emitting diode D5 is lit, thereby determining that the TVS tube is turned on in the current flowing direction.
Likewise, when the current is reversed, i.e.: the current flows into the current detection device from the second power connection 1322, and if the TVS tube is turned on, the current may return to the first power connection 1321 after passing through the TVS tube, at this time, in the current detection device, the current passes through the second light emitting diode D6, and the second light emitting diode D6 is lit, thereby determining that the TVS tube is also turned on in the direction of this current flowing.
In this example, the switching device 120 is only needed to switch the positive and negative electrodes of the positive and negative switching circuit 110, so that the bidirectional conduction detection of the TVS tube is conveniently realized, the polarity conversion by manual operation is not needed, and the TVS tube polarity switching circuit has the advantages of simple operation and comprehensive and reliable test.
Through the utility model discloses conductivity detection circuitry of TVS pipe can realize testing the TVS pipe of connecting on multiple chip, for example, as shown in FIG. 2, TVS pipe is the TVS pipe on integrated circuit board 200, and in this example, the one end of TVS pipe links to each other with integrated circuit board 200's pin, and the other end of TVS pipe links to each other with integrated circuit board 200's earthing terminal EARTH. At this time, the pin connected to the TVS transistor on the board 200 is only required to be used as a test terminal, for example, a first test terminal 1331, then, the ground terminal EARTH of the board is used as another test terminal, for example, a second test terminal 1332, after passing through the third resistor R3, the first power connection terminal 1321 is connected to the first test terminal 1331, and the second power connection terminal 1322 is connected to the second test terminal 1332, so that the bidirectional conductivity test of the TVS transistor on the board card can be implemented.
Further, there are a plurality of TVS pipes of the board card 200, as shown in fig. 2, one ends of the plurality of TVS pipes are connected to the plurality of pins of the board card 200 in a one-to-one correspondence, and the other ends of the plurality of TVS pipes are connected to the ground terminal EARTH of the board card 200. At this time, a plurality of pins of the board card 200 are all connected to the first test terminal 1331, and after the ground terminal EARTH of the board card 200 is connected to the second test terminal 1332 through the third resistor R3, the bidirectional conductivity test can be conveniently performed on the plurality of TVS tubes of the board card 200. The method has the advantages of convenience and simplicity in testing, accurate and reliable testing results, high testing efficiency and low labor cost. In this example, the power source VCC is, for example, a 24V dc power source, and the third resistor R3 is, for example, a 500 ohm resistor.
In an embodiment of the utility model, a detection device is still disclosed, include: the conductivity detection circuit of a TVS tube according to any one of the above embodiments. The detection device has the advantages of convenience and simplicity in conductivity test of the TVS tube, accurate and reliable test results, high test efficiency and low labor cost.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
The above embodiments are merely illustrative, and not restrictive, of the present invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalent substitutions may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all of the technical solutions should be covered by the scope of the claims of the present invention.
Claims (10)
1. A circuit for detecting conductivity of a TVS tube is provided, which comprises:
the positive and negative switching circuit comprises a control end and power supply terminals, and the power supply terminals comprise a first power supply end and a second power supply end;
the switching device is connected with the control end of the positive-negative switching circuit so as to switch the polarities of the first power supply end and the second power supply end through the control end;
the detection circuit comprises a current detection device, a power connection end and a test end, wherein the power connection end is connected with the power terminal, so that when the test end is connected into the TVS tube, the conductivity of the TVS tube is determined according to a current signal in the detection circuit detected by the current detection device.
2. The conductivity detection circuit of TVS tube of claim 1, wherein said positive-negative polarity switching circuit comprises: a first transistor to a fourth transistor, wherein,
the base electrode of the first triode is connected with the switching device, the emitting electrode of the first triode is grounded, the collecting electrode of the first triode is connected with the collecting electrode of the second triode, the emitting electrode of the second triode is connected with the power supply, and the base electrode of the second triode is connected with one end of the first resistor;
the base electrode of the third triode is connected with the switching device, the emitting electrode of the third triode is grounded, the collecting electrode of the third triode is connected with the collecting electrode of the fourth triode, the emitting electrode of the fourth triode is connected with the power supply, and the base electrode of the fourth triode is connected with one end of the second resistor;
the other end of the first resistor is used as the first power supply end, the first power supply end is connected with the collector electrode of the third triode and the collector electrode of the fourth triode, the other end of the second resistor is used as the second power supply end, and the second power supply end is connected with the collector electrode of the first triode and the collector electrode of the second triode.
3. The TVS transistor conduction detection circuit of claim 2, wherein said first transistor and said third transistor are NPN transistors, and said second transistor and said fourth transistor are PNP transistors.
4. The TVS tube conductivity detecting circuit of claim 2 or 3, wherein the switching device comprises a switch, a first terminal of the switch is connected to a power source, a second terminal of the switch is connected to the base of the first transistor, a third terminal of the switch is connected to the base of the third transistor, wherein,
the first end and the second end of the change-over switch are connected, the second power supply end is an anode, the first power supply end is a cathode, the first end and the third end of the change-over switch are connected, the first power supply end is an anode, and the second power supply end is a cathode.
5. The conductivity detection circuit of TVS tube of claim 4, wherein said power connection terminal of said detection circuit comprises a first power connection terminal and a second power connection terminal, said test terminal comprises a first test terminal and a second test terminal, said first power connection terminal is connected to said first power terminal, said second power connection terminal is connected to said second power terminal, said first test terminal is used for connecting to one end of TVS tube, said second test terminal is used for connecting to another end of TVS tube through a third resistor.
6. The TVS tube conductivity detecting circuit of claim 5, wherein the current detecting means includes:
the anode of the first light-emitting diode is connected with the first power supply connecting end, and the cathode of the first light-emitting diode is connected with the first testing end;
a second light emitting diode in anti-parallel with the first light emitting diode.
7. The TVS tube conductivity detection circuit as claimed in claim 6, wherein the TVS tube is a TVS tube on a board card, one end of the TVS tube is connected with a pin of the board card, and the other end of the TVS tube is connected with a grounding end of the board card.
8. The conductivity detection circuit of TVS tubes of claim 7, wherein there are a plurality of TVS tubes, one end of each of the plurality of TVS tubes is connected to a plurality of pins of said board card in a one-to-one correspondence, and the other end of each of the plurality of TVS tubes is connected to a ground terminal of said board card.
9. The TVS transistor conduction detection circuit of claim 8, wherein a plurality of pins of said board card are all connected to said first test terminal, and a ground terminal of said board card is connected to said second test terminal through said third resistor.
10. A detection device, comprising: the conductivity detection circuit of TVS tube as claimed in any one of claims 1 to 9.
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| CN202020814077.3U CN213633692U (en) | 2020-05-15 | 2020-05-15 | Conductivity detection circuit and detection device of TVS tube |
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| CN202020814077.3U CN213633692U (en) | 2020-05-15 | 2020-05-15 | Conductivity detection circuit and detection device of TVS tube |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113567839A (en) * | 2021-07-29 | 2021-10-29 | 深圳市火乐科技发展有限公司 | Circuit detection system and projection equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113567839A (en) * | 2021-07-29 | 2021-10-29 | 深圳市火乐科技发展有限公司 | Circuit detection system and projection equipment |
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