CN211908364U - Multistage lightning surge protection circuit for direct-current power supply of product in power industry - Google Patents
Multistage lightning surge protection circuit for direct-current power supply of product in power industry Download PDFInfo
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- CN211908364U CN211908364U CN202020421731.4U CN202020421731U CN211908364U CN 211908364 U CN211908364 U CN 211908364U CN 202020421731 U CN202020421731 U CN 202020421731U CN 211908364 U CN211908364 U CN 211908364U
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Abstract
The utility model discloses a multistage thunderbolt surge protection circuit for electric power industry product DC power supply, it includes first, two, tertiary thunderbolt surge protection circuit, input power prevents anti-reverse circuit, EMI filter circuit. The first-stage lightning surge protection circuit can absorb most surge energy, and a fuse in the piezoresistor can cut off the circuit in time to prevent the piezoresistor from being ignited and burnt; the input power supply anti-reverse circuit utilizes the one-way conduction characteristic of a diode to avoid the damage of components and input direct current sources in the circuit; the second-stage lightning surge protection circuit rapidly acts and clamps by utilizing the characteristic of a bidirectional transient suppression diode, and reduces surge peak voltage again; the EMI filter can filter noise and reduce electromagnetic interference; the third-stage lightning surge protection circuit absorbs surge peaks and interference through the electrolytic capacitor, and further reduces surge voltage. The protection circuit is simple in structure, multistage in protection and high in reliability, and can effectively protect lightning surge of the direct-current power supply port.
Description
Technical Field
The utility model belongs to the electric power communication field relates to a multistage thunderbolt surge protection circuit for electric power industry product DC power supply.
Background
The power communication equipment is an important component in a power system, the communication equipment including a terminal electric meter uploads power utilization information in real time, power is switched on and off according to instructions and the like, and the reliability of the communication equipment is very important for the whole power system. With the wide application of the power communication equipment, the power communication equipment is inevitably applied to some severe occasions which are easy to be struck by lightning, such as outdoors and the like, and the requirements for the reliable operation of the equipment are higher. If the lightning surge voltage exceeds the withstand voltage of a device in the circuit, the device can be broken down, so that equipment failure is caused; in addition, the accumulation of low voltage surges generated by the switching of the power grid equipment can also reduce the service life of the device.
At present, a piezoresistor is singly used by a direct current power supply of most electric power communication equipment, or a scheme of connecting a fuse and the piezoresistor in series is used for protecting lightning surge, the fuse can break a circuit only under the conditions of overvoltage and very large current, if the leakage current of the piezoresistor is slowly increased, the fuse can not timely act to break the circuit, and the piezoresistor is overheated, ignited and burnt. In addition, the single-stage protection cannot effectively absorb the lightning surge of low frequency and high frequency, and equipment failure can still be caused. In addition, in the direct-current power supply protection circuit, the front-stage and rear-stage protection circuits absorb lightning surge stage by being connected with the common differential-mode inductor in series for time delay, but the common differential-mode inductor is saturated and fails due to overlarge surge current, and the reliability is poor.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides a multistage thunderbolt surge protection circuit for electric power industry product DC power supply. The utility model discloses the main technical scheme who adopts does:
a multi-stage lightning surge protection circuit for a direct-current power supply of a product in the power industry comprises a first-stage lightning surge protection circuit, an input power supply anti-reverse circuit, a second-stage lightning surge protection circuit, an EMI filter circuit and a third-stage lightning surge protection circuit.
The first-stage lightning surge protection circuit comprises thermal protection type piezoresistors TMOV1, TMOV2 and TMOV3, wherein one end of the thermal protection type piezoresistor TMOV1 is connected with a power supply anode DC +, and the other end of the thermal protection type piezoresistor TMOV1 is connected with a power supply cathode DC-; the thermal protection type piezoresistor TMOV2 and TMOV3 are connected in series, one end of a network formed by the piezoresistor TMOV2 and the piezoresistor TMOV3 is connected with a positive pole DC + of a power supply, the other end of the network is connected with a negative pole DC-of the power supply, and the middle connection position of the network is connected with the ground PE. Absorbing most of lightning surge energy by adopting a method of combining a common mode and a differential mode; meanwhile, when the heat absorbed and converted by the piezoresistor reaches the protection limit value of the internal temperature fuse, the fuse can cut off the circuit in time, and the piezoresistor is prevented from being ignited and burnt.
The input power supply anti-reverse circuit comprises an anti-reverse diode D1, wherein the anode of the anti-reverse diode D1 is connected with the positive pole DC + of the power supply and is connected behind the piezoresistor. The anti-reverse diode D1 is connected in series between the first stage lightning surge protection circuit and the second stage lightning surge protection circuit, and by utilizing the unidirectional conduction and reverse cut-off characteristics of the anti-reverse diode, the problem of damage of devices caused by direct reverse polarity of a power supply is solved, and the damage of high voltage possibly generated by a load circuit to a direct current source can be avoided.
The second-stage lightning surge protection circuit comprises a saturation resistance inductor L1 and a bidirectional transient suppression diode TVS1, wherein one end of the saturation resistance inductor L1 is connected with the cathode of the anti-reverse diode D1, and the other end of the saturation resistance inductor L1 is connected with one end of the bidirectional transient suppression diode TVS 1; one end of the bidirectional transient suppression diode TVS1 is connected with the anti-saturation inductor L1, and the other end is connected with the negative pole DC-of the power supply. The L1 can not only realize the gradual absorption of lightning surge by the front-stage and rear-stage protection circuits, but also bear larger surge current to be unsaturated, and the reliability is higher; the TVS1 transistor again reduces the surge spike voltage by its fast acting clamping feature.
The EMI filter circuit comprises an EMI filter, wherein a pin 1 of the EMI filter is connected with one end of the TVS1, a pin 2 of the EMI filter is respectively connected with the other end of the TVS1, a pin 3 of the EMI filter is connected with the cathode of the electrolytic capacitor, and a pin 4 of the EMI filter is connected with the anode of the electrolytic capacitor.
The third-stage lightning surge protection circuit consists of an electrolytic capacitor C1; the positive pole of the electrolytic capacitor C1 is connected with the 4 pin of the EMI filter, and the negative pole is connected with the 3 pin of the EMI filter.
The beneficial effects of the utility model are that a multistage thunderbolt surge protection circuit for terminal meter class DC power supply simple structure can multistage protection, and the reliability is high, the practicality is strong, absorbs surge peak and interference, reduces surge voltage, provides stable, reliable DC source for load circuit. The high-frequency component of the preceding stage lightning surge residual voltage is filtered, other noises in the circuit are filtered, and electromagnetic interference is prevented. The problem of device damage caused by the fact that the polarity of the power supply is connected reversely is solved, and the damage of a high voltage to a direct current source possibly generated by a load circuit can be avoided.
Drawings
Fig. 1 is a block diagram of a multistage lightning surge protection circuit for a terminal electric meter type dc power supply according to the present invention;
fig. 2 is the utility model discloses a multistage thunderbolt surge protection circuit diagram for terminal ammeter class DC power supply.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
As shown in FIG. 1, the utility model discloses a multistage thunderbolt surge protection circuit for electric power industry product DC power supply, it includes first order thunderbolt surge protection circuit, input power supply prevents anti-circuit, second level thunderbolt surge protection circuit, EMI filter circuit and third level thunderbolt surge protection circuit.
As shown in fig. 2, one end of the thermal protection type piezoresistor TMOV1 is connected with the positive pole DC + of the power supply, and the other end is connected with the negative pole DC-; the thermal protection type piezoresistor TMOV2 and TMOV3 are connected in series, one end of a network formed by the thermal protection type piezoresistor TMOV2 and the other end of the network is connected with a positive pole DC + of a power supply, the other end of the network is connected with a negative pole DC-of the power supply, and the middle connection part of the network is connected with the ground PE; the anode of the anti-reverse diode D1 is connected with the positive electrode DC + of the power supply and is connected behind the piezoresistor; one end of the anti-saturation inductor L1 is connected with the cathode of the anti-reverse diode D1, and the other end of the anti-saturation inductor L1 is connected with one end of the bidirectional transient suppression diode TVS 1; one end of the bidirectional transient suppression diode TVS1 is connected with the anti-saturation inductor L1, and the other end of the bidirectional transient suppression diode TVS1 is connected with the negative pole DC-of the power supply; a pin 1 of the EMI filter is connected with one end of the TVS1, a pin 2 is respectively connected with the other end of the TVS1, a pin 3 is connected with the cathode of the electrolytic capacitor, and a pin 4 is connected with the anode of the electrolytic capacitor; the positive pole of the electrolytic capacitor C1 is connected with the 4 pin of the EMI filter, and the negative pole is connected with the 3 pin of the EMI filter.
Under the normal working condition, the impedance of the thermal protection type piezoresistor is very high, which is equivalent to open circuit, and the normal work of the circuit can not be influenced.
When lightning surge occurs, the impedance of the piezoresistor in the first-stage lightning surge protection circuit is rapidly reduced, and most surge energy is absorbed, wherein the thermal protection type piezoresistor TMOV1 forms a differential mode absorption network to absorb most differential mode surge energy, and the thermal protection type piezoresistor TMOV2 and TMOV3 form a common mode absorption network to absorb most common mode surge energy; meanwhile, when the heat absorbed and converted by the piezoresistor reaches the protection limit value of the internal temperature fuse, the fuse can cut off the circuit in time, and the piezoresistor is prevented from being ignited and burnt.
When the residual voltage reaches the second-stage lightning surge protection circuit and two ends of a bidirectional transient suppression diode TVS1, if the residual voltage is smaller than the minimum breakdown voltage of TVS1, the TVS1 does not act and is equivalent to open circuit; if the residual voltage exceeds the minimum breakdown voltage of TVS1, TVS1 will snap clamp, again reducing the surge spike voltage. The response time of the first-stage piezoresistor is nanosecond level, the response time of the second-stage TVS1 tube is picosecond level, and the piezoresistor can absorb more surge energy than the TVS1 tube, so that the lightning surge is firstly absorbed by the piezoresistor and then absorbed by the TVS1 tube by utilizing the time delay characteristic of the anti-saturation inductor L1, the lightning surge is gradually absorbed by the front-stage and rear-stage protection circuits, meanwhile, the saturation magnetic flux density of the inductor L1 is high, the circuit is not saturated easily when large surge current flows, and the reliability of circuit protection is enhanced.
The EMI filter can filter the high-frequency component of the preceding stage lightning surge residual voltage and filter other noises in the circuit, and prevents electromagnetic interference.
When the residual voltage reaches the third-stage lightning surge protection circuit, the electrolytic capacitor C1 absorbs surge peaks and interference, so that the surge voltage is further reduced, and a stable and reliable direct current source is provided for a load circuit.
In addition, the input power supply reverse-connection prevention circuit utilizes the unidirectional conduction and reverse-connection characteristics of the diode D1, so that the problem of damage of devices caused by reverse connection of the power supply polarity is solved, and the damage of a high voltage to a direct current source possibly generated by a load circuit can be avoided.
The three-stage lightning surge protection circuits are mutually matched, and can absorb the lightning surge energy step by step. In practice, the type and the number of the thermal protection type piezoresistors are selected according to the voltage of a direct current power supply and the level capable of bearing lightning surge; selecting a bidirectional transient suppression diode and an electrolytic capacitor according to the maximum bearing voltage and the consumption current of the load circuit component; the differential mode inductance is selected according to the maximum current input and the EMI filter is selected according to the frequency range of the noise to be filtered out.
The above embodiment is a typical embodiment of the present invention, and common changes and substitutions performed by those skilled in the art within the technical scope of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. The utility model provides a multistage lightning surge protection circuit that is used for electric power industry product DC power supply which characterized in that: the power supply protection circuit comprises a first-stage lightning surge protection circuit, an input power supply anti-reverse circuit, a second-stage lightning surge protection circuit, an EMI filter circuit and a third-stage lightning surge protection circuit; the circuit comprises thermal protection type piezoresistors TMOV1, TMOV2, TMOV3, an anti-reverse diode D1, an anti-saturation inductor L1, a bidirectional transient suppression diode TVS1, an EMI filter and an electrolytic capacitor C1;
the first-stage lightning surge protection circuit comprises thermal protection piezoresistors TMOV1, TMOV2 and TMOV3, wherein one end of the thermal protection piezoresistor TMOV1 is connected with a power supply anode DC +, and the other end of the thermal protection piezoresistor TMOV1 is connected with a power supply cathode DC-; the thermal protection type piezoresistor TMOV2 and TMOV3 are connected in series, one end of a network formed by the thermal protection type piezoresistor TMOV2 and the other end of the network is connected with a positive pole DC + of a power supply, the other end of the network is connected with a negative pole DC-of the power supply, and the middle connection part of the network is connected with the ground PE;
the input power supply anti-reverse circuit comprises an anti-reverse diode D1, wherein the anode of the anti-reverse diode D1 is connected with the positive pole DC + of the power supply and is connected behind the piezoresistor;
the second-stage lightning surge protection circuit comprises a saturation resistance inductor L1 and a bidirectional transient suppression diode TVS1, wherein one end of the saturation resistance inductor L1 is connected with the cathode of an anti-reflection diode D1, and the other end of the saturation resistance inductor L1 is connected with one end of the bidirectional transient suppression diode TVS 1; one end of the bidirectional transient suppression diode TVS1 is connected with the anti-saturation inductor L1, and the other end of the bidirectional transient suppression diode TVS1 is connected with the negative pole DC-of the power supply;
the EMI filter circuit comprises an EMI filter, wherein a pin 1 of the EMI filter is connected with one end of the TVS1, a pin 2 of the EMI filter is respectively connected with the other end of the TVS1, a pin 3 of the EMI filter is connected with the cathode of the electrolytic capacitor, and a pin 4 of the EMI filter is connected with the anode of the electrolytic capacitor;
the third-stage lightning surge protection circuit comprises an electrolytic capacitor C1, wherein the anode of the electrolytic capacitor C1 is connected with the 4 pins of the EMI filter, and the cathode of the electrolytic capacitor C1 is connected with the 3 pins of the EMI filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020421731.4U CN211908364U (en) | 2020-03-28 | 2020-03-28 | Multistage lightning surge protection circuit for direct-current power supply of product in power industry |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020421731.4U CN211908364U (en) | 2020-03-28 | 2020-03-28 | Multistage lightning surge protection circuit for direct-current power supply of product in power industry |
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| CN211908364U true CN211908364U (en) | 2020-11-10 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113691121A (en) * | 2021-08-05 | 2021-11-23 | 广东美的厨房电器制造有限公司 | Filter plate and cooking device |
| CN114013328A (en) * | 2021-10-29 | 2022-02-08 | 北京新能源汽车股份有限公司 | Fill communication network electromagnetic interference protection circuit, electric automobile soon, fill electric pile |
| CN114397843A (en) * | 2022-01-10 | 2022-04-26 | 成都凯天电子股份有限公司 | Atmospheric data processing module based on FPGA |
-
2020
- 2020-03-28 CN CN202020421731.4U patent/CN211908364U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113691121A (en) * | 2021-08-05 | 2021-11-23 | 广东美的厨房电器制造有限公司 | Filter plate and cooking device |
| CN113691121B (en) * | 2021-08-05 | 2024-05-14 | 广东威特真空电子制造有限公司 | Filter plate and cooking device |
| CN114013328A (en) * | 2021-10-29 | 2022-02-08 | 北京新能源汽车股份有限公司 | Fill communication network electromagnetic interference protection circuit, electric automobile soon, fill electric pile |
| CN114013328B (en) * | 2021-10-29 | 2024-08-23 | 北京新能源汽车股份有限公司 | Quick-charging communication network electromagnetic interference protection circuit, electric automobile and charging pile |
| CN114397843A (en) * | 2022-01-10 | 2022-04-26 | 成都凯天电子股份有限公司 | Atmospheric data processing module based on FPGA |
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