CN217335075U - TVS diode protection circuit - Google Patents
TVS diode protection circuit Download PDFInfo
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- CN217335075U CN217335075U CN202220373817.3U CN202220373817U CN217335075U CN 217335075 U CN217335075 U CN 217335075U CN 202220373817 U CN202220373817 U CN 202220373817U CN 217335075 U CN217335075 U CN 217335075U
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Abstract
The utility model provides a TVS diode protection circuit, include: the device comprises a TVS diode, an RC circuit, a voltage amplification module, a voltage comparison module and a processor; the first end of the TVS diode is used for being connected with a bus, and the second end of the TVS diode is connected with the input end of the RC circuit; the first output end of the RC circuit is connected with the input end of the voltage amplification module, and the second output end of the RC circuit is grounded; the output end of the voltage amplifying module is connected with the input end of the voltage comparing module, and the output end of the voltage comparing module is connected with an IO port of the processor; TVS diode protection circuit can effectively monitor the short circuit condition of TVS diode, avoid because TVS diode short circuit leads to the back stage mainboard protection inefficacy.
Description
Technical Field
The utility model relates to a power protection technical field especially relates to a TVS diode protection circuit.
Background
A conventional Transient Voltage Suppressor (TVS) diode is a high-performance protection device in the form of a diode, which has an extremely fast response speed and a considerable surge discharging capability. When two poles of the TVS diode are impacted by reverse transient high energy, the TVS diode can quickly change the high impedance between the two poles into low impedance, absorb surge power up to thousands of watts, clamp the voltage between the two poles at a preset value, effectively protect precision components in an electronic circuit from being damaged by various surge pulses, and is generally used for a BUS BUS for surge protection so as to ensure the safe operation of a circuit system and a module.
At present, in a protection circuit of a TVS diode, after the TVS diode works under a long-time overvoltage or works and ages for a long time, the TVS diode is short-circuited or impedance is obviously reduced, surge lightning stroke protection capability is reduced, a rear-stage mainboard cannot be continuously protected, and product performance is reduced or functions are abnormal.
SUMMERY OF THE UTILITY MODEL
To the problem, an object of the utility model is to provide a TVS diode protection circuit, its short circuit condition that can effectively monitor the TVS diode avoids because the TVS diode short circuit leads to the back level mainboard protection inefficacy.
The utility model provides a TVS diode protection circuit, include: the device comprises a TVS diode, an RC circuit, a voltage amplification module, a voltage comparison module and a processor; the first end of the TVS diode is used for being connected with a bus, and the second end of the TVS diode is connected with the input end of the RC circuit; the first output end of the RC circuit is connected with the input end of the voltage amplification module, and the second output end of the RC circuit is grounded; the output end of the voltage amplifying module is connected with the input end of the voltage comparing module, and the output end of the voltage comparing module is connected with the IO port of the processor.
As an improvement of the above, the RC circuit includes: the circuit comprises a first resistor and a capacitor, wherein a first end of the first resistor and a first end of the capacitor are connected with an input end of the RC circuit, a second end of the first resistor is connected with a first output end of the RC circuit, and a second end of the capacitor is connected with a second output end of the RC circuit.
As an improvement of the above scheme, the voltage amplification module includes a non-inverting amplifier, a second resistor and a third resistor, a non-inverting input terminal of the non-inverting amplifier is connected to an input terminal of the voltage amplification module, an inverting input terminal of the non-inverting amplifier is connected to a first terminal of the second resistor and a first terminal of the third resistor, and an output terminal of the non-inverting amplifier is connected to a second terminal of the second resistor and an output terminal of the voltage amplification module; and the second end of the third resistor is grounded.
As an improvement of the above scheme, the TVS diode protection circuit further includes a voltage stabilizing module, an input end of the voltage stabilizing module is connected to the second end of the first resistor, and an output end of the voltage stabilizing module is grounded.
As an improvement of the above scheme, the voltage regulation module includes a voltage regulation diode, a cathode of the voltage regulation diode is connected with an input end of the voltage regulation module, and an anode of the voltage regulation diode is connected with an output of the voltage regulation module.
As an improvement of the above scheme, the voltage comparison module includes a voltage comparator, a fourth resistor and a fifth resistor, a non-inverting input terminal of the voltage comparator is connected to an input terminal of the voltage comparison module, and an inverting input terminal of the voltage comparator is connected to a first terminal of the fourth resistor and a first terminal of the fifth resistor; the second end of the fourth resistor is used for connecting a power supply; a second end of the fifth resistor is grounded; and the output end of the voltage comparator is connected with the output end of the voltage comparison module.
As an improvement of the above scheme, the TVS diode protection circuit further includes a sixth resistor, a first end of the sixth resistor is connected between the output end of the voltage comparison module and the IO port of the processor, and a second end of the sixth resistor is used for accessing a power supply.
As an improvement of the above scheme, the voltage comparator is configured to compare the voltage output by the in-phase amplifier with a reference voltage, and trigger an output warning signal when the voltage output by the in-phase amplifier is greater than the reference voltage; and the processor is used for responding to the warning signal and closing the power supply of the post-stage circuit.
Compared with the prior art, the beneficial effects of the utility model reside in that: the TVS diode protection circuit includes: the device comprises a TVS diode, an RC circuit, a voltage amplification module, a voltage comparison module and a processor; the first end of the TVS diode is used for being connected with a bus, and the second end of the TVS diode is connected with the input end of the RC circuit; the first output end of the RC circuit is connected with the input end of the voltage amplification module, and the second output end of the RC circuit is grounded; the output end of the voltage amplifying module is connected with the input end of the voltage comparing module, and the output end of the voltage comparing module is connected with the IO port of the processor. The embodiment of the utility model provides an in, the bus flow is through the voltage of TVS diode passes through behind the RC circuit voltage amplification module enlargies, then with the reference voltage of voltage comparison module is relatively to trigger warning signal for the operation is responded to according to warning signal to the treater, for example closes the power, lights the warning light etc. thereby monitors the short circuit condition of TVS diode, avoids because TVS diode short circuit leads to the back level mainboard protection inefficacy.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required for the embodiments will be briefly described below, and obviously, the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a TVS diode protection circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of another TVS diode protection circuit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a TVS diode protection circuit according to an embodiment of the present invention.
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 efforts belong to the protection scope of the present invention.
Please refer to fig. 1, which is a schematic diagram of a TVS diode protection circuit according to an embodiment of the present invention, the TVS diode protection circuit specifically includes: the circuit comprises a TVS diode D1, an RC circuit 1, a voltage amplification module 2, a voltage comparison module 3 and a processor 4; the first end of the TVS diode D1 is used for being connected with a BUS BUS, and the second end of the TVS diode D1 is connected with the input end of the RC circuit 1; the first output end of the RC circuit 1 is connected with the input end of the voltage amplification module 2, and the second output end of the RC circuit is grounded; the output end of the voltage amplification module 2 is connected with the input end of the voltage comparison module 3, and the output end of the voltage comparison module 3 is connected with the IO port of the processor 4.
For example, when the TVS diode is subjected to a high voltage for multiple times, aging damage may occur, and impedance may start to decrease or approach a short circuit, a current flowing through the RC circuit 1 may increase, because the TVS diode may only slightly damage, a voltage flowing through the RC circuit 1 is smaller at this time, the voltage is amplified by the voltage amplifying module 2 and then compared with a reference voltage of the voltage comparing module 3, but a set condition is met, for example, when the voltage output by the voltage amplifying module 2 is greater than the reference voltage, the voltage comparing module 3 is triggered to output a warning signal, the warning signal is output, that is, the function of the TVS diode is affected at this time, for example, a short circuit occurs, and needs to be processed, the warning signal is output to an IO port of the processor 4 to inform the processor 4 that the TVS diode is abnormal, and the processing may perform corresponding post-stage processing, for example, for example, the power supply of a prototype machine is turned off, a prompt lamp is lightened, the short-circuit condition of the TVS diode can be effectively monitored, and the failure of rear-stage mainboard protection caused by the short circuit of the TVS diode is avoided, so that the running condition of a protection device is monitored in real time, and whether the TVS needs to be replaced is warned. In the embodiment of the present invention, the specific type of the processor is not specifically limited, and for example, an ADM1272 chip may be used.
As shown in fig. 2, the RC circuit includes: a first resistor R1 and a capacitor C1, wherein a first terminal of the first resistor R1 and a first terminal of the capacitor C1 are connected to the input terminal of the RC circuit, a second terminal of the first resistor R1 is connected to the first output terminal of the RC circuit, and a second terminal of the capacitor C1 is connected to the second output terminal of the RC circuit.
For example, the first resistor R1 is used as a sampling resistor, when the TVS diode D1 encounters high voltage or has aged long-term operation performance many times, the impedance at both ends of the TVS diode D1 starts to decrease, and the BUS has a dc bias with a fixed voltage, which causes the current flowing through the first resistor R1 to increase, because the TVS diode D1 may be slightly damaged at this time, the impedance at both ends of the TVS diode is still large, the voltage flowing through the first resistor R1 is small at this time, and the voltage can enter the voltage comparison module 3 after being amplified and compared with the reference voltage. Because TVS diode D1's damage is the gradual damage under the most of the circumstances, is the process that has a resistance to diminish gradually, exceeds a value and just can indicate TVS diode D1 inefficacy, the utility model discloses a first resistance R1, the design of the circuit of voltage amplification module, the components and parts parameter has been transferred, sets for the decision threshold, for example combine bias voltage on the BUS of BUS, TVS diode D1's impedance change curve, the comprehensive decision reference voltage such as the magnification of voltage amplification module. The utility model discloses need not direct detection TVS diode D1, through first resistance detection current not only can realize short-circuit protection, can also realize different TVS's inefficacy or short circuit detection through the different resistances of setting for first resistance R1, and the circuit is simple, has good suitability. Simultaneously appear resistance diminish and short circuit back when TVS diode D1, owing to have electric capacity C1's existence, the link still is the high impedance, and voltage signal still can keep transmitting on the BUS BUS, and function and performance are not influenced, but this moment because TVS diode D1 has had the damage, and surge thunderbolt protective capacity descends, need to let CPU know this condition, does processing on next step, for example can close model machine power, can give and be used for the pilot lamp suggestion etc. the utility model discloses in do not specifically limit.
In another embodiment, as shown in fig. 2, the TVS diode protection circuit further includes a voltage stabilizing module 5, an input terminal of the voltage stabilizing module 5 is connected to the second terminal of the first resistor R1, and an output terminal of the voltage stabilizing module 5 is grounded.
As shown in fig. 3, the voltage amplification module includes a non-inverting amplifier U1, a second resistor R2, and a third resistor R3, a non-inverting input terminal of the non-inverting amplifier U1 is connected to the input terminal of the voltage amplification module, an inverting input terminal of the non-inverting amplifier U1 is connected to a first end of a second resistor R2 and a first end of a third resistor R3, and an output terminal of the non-inverting amplifier U1 is connected to a second end of the second resistor R2 and an output terminal of the voltage amplification module; the second end of the third resistor R3 is grounded.
Specifically, the voltage regulation module 5 includes a voltage regulation diode D2, a cathode of the voltage regulation diode D2 is connected to an input terminal of the voltage regulation module 5, and an anode of the voltage regulation diode D2 is connected to an output of the voltage regulation module 5.
In the embodiment of the present invention, the zener diode D2 is connected between the non-inverting input terminal of the non-inverting amplifier U1 and the second terminal of the first resistor R1, so that the non-inverting amplifier U1 can be effectively protected.
The voltage comparison module comprises a voltage comparator U2, a fourth resistor R4 and a fifth resistor R5, wherein the non-inverting input end of the voltage comparator U2 is connected with the input end of the voltage comparison module, and the inverting input end of the voltage comparator U2 is connected with the first end of the fourth resistor R4 and the first end of the fifth resistor R5; the second end of the fourth resistor R4 is used for connecting a power supply; a second end of the fifth resistor R5 is grounded; the output end of the voltage comparator U2 is connected with the output end of the voltage comparison module.
Further, the TVS diode protection circuit further includes a sixth resistor R6, a first end of the sixth resistor R6 is connected between the output terminal of the voltage comparison module and the IO port of the processor, and a second end of the sixth resistor R6 is used for connecting to a power supply.
The utility model discloses a TVS diode protection circuit can connect in parallel in XDSL, the difference line and the single-ended on the bus such as USB are online, have extensive application.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is communication connection between them, and specifically, the connection relationship can be implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.
Claims (7)
1. A TVS diode protection circuit, comprising: the device comprises a TVS diode, an RC circuit, a voltage amplification module, a voltage comparison module and a processor; the first end of the TVS diode is used for being connected with a bus, and the second end of the TVS diode is connected with the input end of the RC circuit; the first output end of the RC circuit is connected with the input end of the voltage amplification module, and the second output end of the RC circuit is grounded; the output end of the voltage amplifying module is connected with the input end of the voltage comparing module, and the output end of the voltage comparing module is connected with the IO port of the processor.
2. The TVS diode protection circuit of claim 1, wherein the RC circuit comprises: the circuit comprises a first resistor and a capacitor, wherein a first end of the first resistor and a first end of the capacitor are connected with an input end of the RC circuit, a second end of the first resistor is connected with a first output end of the RC circuit, and a second end of the capacitor is connected with a second output end of the RC circuit.
3. The TVS diode protection circuit of claim 2, wherein said voltage amplification block comprises a non-inverting amplifier, a second resistor and a third resistor, wherein a non-inverting input of said non-inverting amplifier is connected to an input of said voltage amplification block, a non-inverting input of said non-inverting amplifier is connected to a first terminal of said second resistor and a first terminal of said third resistor, and an output of said non-inverting amplifier is connected to a second terminal of said second resistor and an output of said voltage amplification block; and the second end of the third resistor is grounded.
4. The TVS diode protection circuit of claim 3, further comprising a voltage regulation block, an input terminal of the voltage regulation block being connected to the second terminal of the first resistor, an output terminal of the voltage regulation block being connected to ground.
5. The TVS diode protection circuit of claim 4, wherein the regulator module comprises a regulator diode, a cathode of the regulator diode being connected to an input of the regulator module, and an anode of the regulator diode being connected to an output of the regulator module.
6. The TVS diode protection circuit of claim 3, wherein the voltage comparison module includes a voltage comparator, a fourth resistor and a fifth resistor, a non-inverting input of the voltage comparator is connected with an input of the voltage comparison module, and an inverting input of the voltage comparator is connected with a first terminal of the fourth resistor and a first terminal of the fifth resistor; the second end of the fourth resistor is used for connecting a power supply; a second end of the fifth resistor is grounded; and the output end of the voltage comparator is connected with the output end of the voltage comparison module.
7. The TVS diode protection circuit as claimed in claim 5, further comprising a sixth resistor, a first end of the sixth resistor being connected between the output of the voltage comparison module and the IO port of the processor, a second end of the sixth resistor being for accessing a power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220373817.3U CN217335075U (en) | 2022-02-23 | 2022-02-23 | TVS diode protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220373817.3U CN217335075U (en) | 2022-02-23 | 2022-02-23 | TVS diode protection circuit |
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| CN217335075U true CN217335075U (en) | 2022-08-30 |
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| CN202220373817.3U Active CN217335075U (en) | 2022-02-23 | 2022-02-23 | TVS diode protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115588973A (en) * | 2022-11-24 | 2023-01-10 | 苏州浪潮智能科技有限公司 | Transient diode failure monitoring circuit |
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- 2022-02-23 CN CN202220373817.3U patent/CN217335075U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115588973A (en) * | 2022-11-24 | 2023-01-10 | 苏州浪潮智能科技有限公司 | Transient diode failure monitoring circuit |
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