CN215180531U - Zinc oxide piezoresistor measuring device - Google Patents
Zinc oxide piezoresistor measuring device Download PDFInfo
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- CN215180531U CN215180531U CN202120070493.1U CN202120070493U CN215180531U CN 215180531 U CN215180531 U CN 215180531U CN 202120070493 U CN202120070493 U CN 202120070493U CN 215180531 U CN215180531 U CN 215180531U
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- circuit
- zinc oxide
- thyristor
- relay
- cathode
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- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 title claims abstract description 110
- 239000011787 zinc oxide Substances 0.000 title claims abstract description 55
- 238000012360 testing method Methods 0.000 claims abstract description 49
- 238000007599 discharging Methods 0.000 claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims description 14
- 230000002457 bidirectional effect Effects 0.000 claims description 13
- 238000005259 measurement Methods 0.000 claims description 8
- 230000001681 protective effect Effects 0.000 claims description 2
- 230000001052 transient effect Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 9
- 230000000903 blocking effect Effects 0.000 abstract description 5
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model discloses a zinc oxide piezoresistor measuring device, which comprises a test power supply and a test electrode, wherein the test power supply comprises a rectifying circuit, a reversing circuit and a discharging circuit; the input end of the rectification circuit is connected with three-phase alternating current; the output end of the rectification circuit is connected with the input end of the reversing circuit; the output end of the reversing circuit is connected with the input end of the discharging circuit, the output end of the discharging circuit is connected with the testing electrode, and the testing electrode is connected with the zinc oxide piezoresistor to be tested; a reversing circuit is arranged between a test main circuit and a tested zinc oxide piezoresistor; and when the reactor is charged, the main circuit is cut off, so that the reactor discharges the zinc oxide resistance valve plate. A method of blocking a thyristor reversely by an LC oscillating circuit is adopted in the reversing circuit to protect a test main circuit from being impacted by surge current. The service life of the test circuit is effectively prolonged, the circuit structure is simple, and the operation is convenient.
Description
Technical Field
The utility model relates to a piezo-resistor tests technical field, specifically is a zinc oxide piezo-resistor measuring device.
Background
The zinc oxide resistance valve plate is a core element of a zinc oxide lightning arrester and is used for preventing external lightning strike or internal overvoltage impact from damaging electric equipment. The measurement of the electrical parameters (including nonlinear coefficient, leakage current, voltage gradient and residual voltage ratio) of the zinc oxide resistor valve plate is of great importance, and the parameters are also the standards for directly determining whether the zinc oxide piezoresistor can meet the requirements of practical engineering application. The zinc oxide piezoresistor has different working temperature and environment temperature due to different operation working conditions, and the electrical parameters measured at the working temperature as close as possible are closer to the electrical performance under the actual operation condition. The existing measuring method and the measuring device have the following problems: 1. when a common zinc oxide piezoresistor is tested, special impulse voltage needs to be provided, and impulse discharge needs to be carried out every time the test is carried out, so that the phenomenon that the energy consumption is too high and the like can occur in the conventional main test circuit, and in addition, the process of the impulse discharge can generate extremely large surge current, the loss is caused to the main test circuit, and the service life of the main test circuit is threatened; 2. The test box of the zinc oxide resistance card and the zinc oxide test production line device have high cost, which is hundreds of thousands to hundreds of thousands, and the test period is long and the operation is complex.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a zinc oxide piezoresistor measuring device, which arranges a reversing circuit between a test main circuit and a measured zinc oxide piezoresistor; and when the reactor is charged, the main circuit is cut off, so that the reactor discharges the zinc oxide resistance valve plate. A method of blocking a thyristor reversely by an LC oscillating circuit is adopted in the reversing circuit to protect a test main circuit from being impacted by surge current. The service life of the test circuit is effectively prolonged, the circuit structure is simple, and the operation is convenient.
In order to achieve the above object, the utility model provides a following technical scheme: a zinc oxide piezoresistor measuring device comprises a test power supply and a test electrode, wherein the test power supply comprises a rectifying circuit, a reversing circuit and a discharging circuit; the input end of the rectification circuit is connected with three-phase alternating current; the output end of the rectification circuit is connected with the input end of the reversing circuit; the output end of the reversing circuit is connected with the input end of the discharging circuit, the output end of the discharging circuit is connected with the testing electrode, and the testing electrode is connected with the zinc oxide piezoresistor to be tested;
the reversing circuit comprises a first relay, a first thyristor, a second thyristor, a third thyristor, a first diode, a second relay, a first capacitor and a first inductor; one end of the first inductor is connected with the anode of the first thyristor and the normally closed contact of the first relay, the normally closed contact of the first relay is connected with the anode of the first diode, and the cathode of the first diode is connected with the control end of the first thyristor; the cathode of the first thyristor is connected with one end of the discharge circuit;
the other end of the first inductor is connected with the anode of the second thyristor and the normally open contact of the first relay; the normally open contact of the first relay is connected with the anode of a second diode, the cathode of the second diode is connected with the control end of the second thyristor, and the cathode of the second thyristor is connected with one end of a first capacitor; the other end of the first capacitor is connected with the cathode of the first thyristor;
the other end of the first capacitor is also connected with one end of a normally closed contact of a second relay and the anode of a third thyristor, the other end of the normally closed contact of the second relay is connected with the anode of a third diode, and the cathode of the third diode is connected with the anode of the third diode
And the cathode of the third thyristor is connected with the other end of the discharge circuit.
Preferably, the discharge circuit includes a second relay and a reactor; one end of the reactor is connected with the cathode of the first thyristor; the other end of the reactor is connected with the cathode of the third thyristor; the normally open contact of the second relay is connected with one test electrode, the cathode of the third thyristor is connected with the other test electrode, and the zinc oxide piezoresistor to be tested is connected between the two test electrodes.
Preferably, in any one of the above embodiments, the rectifier circuit includes a transformer, a bidirectional TVS tube, and a rectifier bridge; the transformer comprises a transformer, a bidirectional TVS tube, a rectifier bridge, a primary coil, a secondary coil, a bidirectional TVS tube, a rectifier bridge and a transformer, wherein the primary coil of the transformer is connected with three-phase alternating current, two ends of the secondary coil of the transformer are connected with the bidirectional TVS tube in parallel, one end of the secondary coil of the transformer is connected with one input end of the rectifier bridge, and the other end of the secondary coil of the transformer is connected with the other input end of the rectifier bridge.
In any one of the above embodiments, preferably, the discharge circuit further includes a protection resistor.
In any one of the above embodiments, preferably, the protection resistor is connected in parallel across the reactor.
In any one of the above embodiments, preferably, the protection resistor is a nonlinear zinc oxide resistor.
In any of the above embodiments, preferably, the voltage level of the nonlinear zinc oxide resistor is higher than that of the zinc oxide varistor to be tested.
In any one of the above embodiments, it is preferable that the control coils of the first relay and the second relay are connected to the secondary coil of the reactor, respectively.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the zinc oxide piezoresistor measuring device of the utility model arranges a reversing circuit between the main test circuit and the zinc oxide piezoresistor to be measured; and when the reactor is charged, the main circuit is cut off, so that the reactor discharges the zinc oxide resistance valve plate. A method of blocking a thyristor reversely by an LC oscillating circuit is adopted in the reversing circuit to protect a test main circuit from being impacted by surge current. The service life of the test circuit is effectively prolonged, the circuit structure is simple, and the operation is convenient.
2. The utility model discloses a zinc oxide piezo-resistor measuring device still includes protective resistor in discharge circuit, carries out overvoltage protection to the main circuit, and its voltage rating is higher than the resistance that awaits measuring. When the nonlinear resistor to be tested fails, the protection resistor can limit the high voltage at the two ends of the reactor.
3. The utility model discloses a zinc oxide piezo-resistor measuring device has set up two-way TVS pipe in rectifier circuit's the secondary coil, can restrain the overload pulse that the electric wire netting brought effectively to play the effect of all components and parts in protection rectifier bridge and the load.
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
Fig. 1 is a circuit diagram of a commutation circuit in a zinc oxide piezoresistor measuring device provided by the utility model;
FIG. 2 is a circuit diagram of a rectifying circuit in the zinc oxide piezoresistor measuring device provided by the utility model;
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1-2, the present invention provides a technical solution: a zinc oxide piezoresistor measuring device comprises a test power supply and a test electrode, wherein the test power supply comprises a rectifying circuit, a reversing circuit and a discharging circuit; the input end of the rectification circuit is connected with three-phase alternating current; the output end of the rectification circuit is connected with the input end of the reversing circuit; the output end of the reversing circuit is connected with the input end of the discharging circuit, the output end of the discharging circuit is connected with the testing electrode, and the testing electrode is connected with the zinc oxide piezoresistor to be tested.
In this embodiment, the input three-phase current is rectified by the rectifier circuit, the rectified output current is input to the commutation circuit, the commutation circuit outputs a control signal, and the current of the rectifier circuit, which is the main circuit, is cut off. The discharge circuit discharges the tested zinc oxide resistor.
As shown in fig. 2, specifically, the rectifier circuit includes a transformer, a bidirectional TVS tube and a rectifier bridge; the transformer comprises a transformer, a bidirectional TVS tube, a rectifier bridge, a primary coil, a secondary coil, a bidirectional TVS tube, a rectifier bridge and a transformer, wherein the primary coil of the transformer is connected with three-phase alternating current, two ends of the secondary coil of the transformer are connected with the bidirectional TVS tube in parallel, one end of the secondary coil of the transformer is connected with one input end of the rectifier bridge, and the other end of the secondary coil of the transformer is connected with the other input end of the rectifier bridge. A primary coil of the transformer is connected with three-phase alternating current, a secondary coil is coupled with the primary coil, the induced current is input into a rectifier bridge after being obtained, and a direct current signal is output to a reversing circuit after the induced current is rectified by the rectifier bridge; the application of the bidirectional TVS in the alternating current circuit can effectively restrain overload pulse brought by a power grid, thereby playing a role in protecting all components in a rectifier bridge and a load. It should be noted that the clamping voltage of the TVS is not greater than the maximum allowable voltage of the circuit.
As shown in fig. 1, the commutation circuit includes a first relay ZL, a first thyristor V1, a second thyristor V2, a third thyristor V3, a first diode D1, a second diode D2, a second relay K, a first capacitor C, and a first inductor L1; one end of the first inductor L1 is connected with the anode of a first thyristor V1 and the normally closed contact of a first relay ZL, the normally closed contact of the first relay ZL is connected with the anode of a first diode D1, and the cathode of the first diode D1 is connected with the control end of a first thyristor V1; the cathode of the first thyristor V1 is connected with one end of the discharge circuit;
the other end of the first inductor L1 is connected with the anode of the second thyristor V2 and the normally open contact of the first relay ZL; a normally open contact of the first relay ZL is connected with an anode of a second diode D2, a cathode of the second diode D2 is connected, a control end of the second thyristor V2, and a cathode of the second thyristor V2 is connected with one end of a first capacitor C; the other end of the first capacitor C is connected with the cathode of a first thyristor V1; and control coils of the first relay and the second relay are respectively connected with secondary coils of the reactor.
The other end of the first capacitor C is further connected with one end of a normally closed contact of a second relay K and the anode of a third thyristor V3, the other end of the normally closed contact of the second relay K is connected with the anode of a third diode, the cathode of the third diode D3 is connected with the control end of a third thyristor V3, and the cathode of the third thyristor V3 is connected with the other end of the discharge circuit.
Preferably, the discharge circuit includes a second relay K and a reactor; one end of the reactor is connected with the cathode of the first thyristor V1; the other end of the reactor is connected with the cathode of a third thyristor V3; the normally open contact of the second relay K is connected with one test electrode, the cathode of the third thyristor V3 is connected with the other test electrode, and the zinc oxide piezoresistor to be tested is connected between the two test electrodes.
In the present commutation circuit, a rectifier circuit first charges a reactor L. After the reactor L is charged, the relay ZJ and the relay K are enabled to act through secondary side logic control of the secondary coil, a normally closed contact A of the ZJ is disconnected, a normally open contact B of the ZJ is closed and V2 is conducted, a normally closed contact C of the relay K is disconnected, and a normally open contact V3 is disconnected, at the moment, a forward current V1 is still conducted, an oscillation circuit formed by the L1 and the C starts to oscillate, the capacitor C starts to discharge through the L1, the current direction of the capacitor C is opposite to that of a main circuit current, when the current value flowing through the V1 is reduced to 0, the V1 is forcibly disconnected, and the reversing process is ended. The method of blocking the thyristor reversely by the LC oscillating circuit is adopted in the commutation circuit, so that the process of cutting off the main circuit and discharging the zinc oxide resistance valve plate by the reactor is realized.
In the preferred embodiment of the present application, the discharge circuit further includes a protection resistor R5. The protection resistor is connected in parallel at two ends of the reactor. The protection resistor is a nonlinear zinc oxide resistor. The voltage level of the nonlinear zinc oxide resistor is higher than that of the zinc oxide piezoresistor to be detected. The protection resistor is arranged in the discharge circuit to perform overvoltage protection on the main circuit, and the voltage level of the protection resistor is higher than that of the resistor to be detected. When the nonlinear resistor to be tested fails, the protection resistor can limit the high voltage at the two ends of the reactor.
The zinc oxide piezoresistor measuring device of the utility model arranges a reversing circuit between the main test circuit and the zinc oxide piezoresistor to be measured; and when the reactor is charged, the main circuit is cut off, so that the reactor discharges the zinc oxide resistance valve plate. A method of blocking a thyristor reversely by an LC oscillating circuit is adopted in the reversing circuit to protect a test main circuit from being impacted by surge current. The service life of the test circuit is effectively prolonged, the circuit structure is simple, and the operation is convenient.
In the description of the present invention, it is to be understood that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings and are only for convenience in describing the present invention and simplifying the description, but are not intended to indicate or imply that the indicated devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present 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 the invention. In this specification, the schematic representations of the terms used above do not necessarily 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.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A zinc oxide piezoresistor measuring device comprises a test power supply and a test electrode, and is characterized in that the test power supply comprises a rectifying circuit, a reversing circuit and a discharging circuit; the input end of the rectification circuit is connected with three-phase alternating current; the output end of the rectification circuit is connected with the input end of the reversing circuit; the output end of the reversing circuit is connected with the input end of the discharging circuit, the output end of the discharging circuit is connected with the testing electrode, and the testing electrode is connected with the zinc oxide piezoresistor to be tested;
the reversing circuit comprises a first relay, a first thyristor, a second thyristor, a third thyristor, a first diode, a second relay, a first capacitor and a first inductor; one end of the first inductor is connected with the anode of the first thyristor and the normally closed contact of the first relay, the normally closed contact of the first relay is connected with the anode of the first diode, and the cathode of the first diode is connected with the control end of the first thyristor; the cathode of the first thyristor is connected with one end of the discharge circuit;
the other end of the first inductor is connected with the anode of the second thyristor and the normally open contact of the first relay; the normally open contact of the first relay is connected with the anode of a second diode, the cathode of the second diode is connected with the control end of the second thyristor, and the cathode of the second thyristor is connected with one end of a first capacitor; the other end of the first capacitor is connected with the cathode of the first thyristor;
the other end of the first capacitor is also connected with one end of a normally closed contact of a second relay and the anode of a third thyristor, the other end of the normally closed contact of the second relay is connected with the anode of a third diode, and the cathode of the third diode is connected with the anode of the third diode
And the cathode of the third thyristor is connected with the other end of the discharge circuit.
2. The zinc oxide varistor measurement device of claim 1, wherein the discharge circuit comprises a second relay and a reactor; one end of the reactor is connected with the cathode of the first thyristor; the other end of the reactor is connected with the cathode of the third thyristor; the normally open contact of the second relay is connected with one test electrode, the cathode of the third thyristor is connected with the other test electrode, and the zinc oxide piezoresistor to be tested is connected between the two test electrodes.
3. The zinc oxide varistor measurement device of claim 1, characterized in that: the rectification circuit comprises a transformer, a bidirectional TVS (transient voltage suppressor) tube and a rectification bridge; the transformer comprises a transformer, a bidirectional TVS tube, a rectifier bridge, a primary coil, a secondary coil, a bidirectional TVS tube, a rectifier bridge and a transformer, wherein the primary coil of the transformer is connected with three-phase alternating current, two ends of the secondary coil of the transformer are connected with the bidirectional TVS tube in parallel, one end of the secondary coil of the transformer is connected with one input end of the rectifier bridge, and the other end of the secondary coil of the transformer is connected with the other input end of the rectifier bridge.
4. The zinc oxide varistor measurement device of claim 1, characterized in that: the discharge circuit also comprises a protective resistor.
5. The zinc oxide varistor measurement device of claim 4, characterized in that: the protection resistor is connected in parallel at two ends of the reactor.
6. The zinc oxide varistor measurement device of claim 5, wherein: the protection resistor is a nonlinear zinc oxide resistor.
7. The zinc oxide varistor measurement device of claim 6, wherein: the voltage level of the nonlinear zinc oxide resistor is higher than that of the zinc oxide piezoresistor to be detected.
8. The zinc oxide varistor measurement device of claim 6, wherein: and control coils of the first relay and the second relay are respectively connected with secondary coils of the reactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120070493.1U CN215180531U (en) | 2021-01-12 | 2021-01-12 | Zinc oxide piezoresistor measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120070493.1U CN215180531U (en) | 2021-01-12 | 2021-01-12 | Zinc oxide piezoresistor measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215180531U true CN215180531U (en) | 2021-12-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120070493.1U Expired - Fee Related CN215180531U (en) | 2021-01-12 | 2021-01-12 | Zinc oxide piezoresistor measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215180531U (en) |
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2021
- 2021-01-12 CN CN202120070493.1U patent/CN215180531U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211214 |
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| CF01 | Termination of patent right due to non-payment of annual fee |