CN219739961U - Lightning protection circuit - Google Patents
Lightning protection circuit Download PDFInfo
- Publication number
- CN219739961U CN219739961U CN202320631222.8U CN202320631222U CN219739961U CN 219739961 U CN219739961 U CN 219739961U CN 202320631222 U CN202320631222 U CN 202320631222U CN 219739961 U CN219739961 U CN 219739961U
- Authority
- CN
- China
- Prior art keywords
- module
- power supply
- voltage
- driving
- resistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001514 detection method Methods 0.000 claims abstract description 26
- 239000004065 semiconductor Substances 0.000 claims description 26
- 230000001012 protector Effects 0.000 claims description 23
- 229910044991 metal oxide Inorganic materials 0.000 claims description 3
- 150000004706 metal oxides Chemical class 0.000 claims description 3
- 230000002265 prevention Effects 0.000 abstract description 8
- 208000025274 Lightning injury Diseases 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model provides a lightning protection circuit which can meet the kiloampere level current capacity, has a reverse connection prevention function, and can reduce the cost of the lightning protection circuit and the space layout; the input end is connected with a power supply, and the output end is connected with a post-stage circuit and comprises a voltage detection module, a driving module and a main surge protection module which are sequentially connected; the voltage detection module is connected with a power supply, and is used for detecting the voltage of the input end of the power supply, obtaining a voltage control signal and transmitting the voltage control signal to the driving module; the driving module is used for receiving the voltage control signal output by the voltage detection module, obtaining a driving signal and transmitting the driving signal to the main surge protection module; the main surge protection module is connected with the rear-stage circuit and is used for receiving a driving signal output from the driving module so as to absorb negative-pressure surge and reversely connect and protect the rear-stage circuit.
Description
Technical Field
The utility model relates to the technical field of lightning protection, in particular to a lightning protection circuit.
Background
The lightning protection circuit is a key circuit for protecting a power input port, and the circuit plays a role in protecting a post-stage power conversion device or a battery pack, and is equipped with the lightning protection circuit in almost all secondary power and primary power applications. For outdoor application scene, typical lightning protection circuit is provided with one-level protection circuit and second grade protection circuit generally, one-level protection circuit is realized the positive and negative voltage lightning protection of input and output by high-power TVS of kiloampere level and decoupling inductance, can clamp positive pressure surge in reasonable scope through one-level protection circuit, but negative pressure surge is still high voltage because its particularity often still, extremely fragile back-stage circuit sensitive components and parts, consequently still need set up second grade protection circuit and further reduce one-level protection circuit's negative residual voltage, in order to protect back-stage circuit sensitive components and parts not damaged, simultaneously because of the positive negative pole of power input port is not allowed to connect conversely, it is realized by power MOS pipe series power diode to need second grade protection circuit to prevent reverse connection, it possesses negative residual voltage clamp ability and prevents reverse connection ability, but because MOS pipe's through-flow ability is low, can't satisfy kiloampere level application demand. Therefore, how to improve the current capacity of the lightning protection circuit to the kiloampere level, and make the lightning protection circuit have the reverse connection preventing function, reduce the cost of the lightning protection circuit and reduce the space layout become the problems to be solved urgently.
Disclosure of Invention
In view of the above problems, the present utility model provides a lightning protection circuit, which can meet the kiloampere level current capacity, has a reverse connection prevention function, and can reduce the cost of the lightning protection circuit and the space layout.
The technical scheme of the utility model is that the lightning protection circuit comprises a voltage detection module, a driving module and a main surge protection module which are sequentially connected, wherein the input end of the lightning protection circuit is connected with a power supply, and the output end of the lightning protection circuit is connected with a rear-stage circuit;
the voltage detection module is connected with a power supply, and is used for detecting the voltage of the input end of the power supply, obtaining a voltage control signal and transmitting the voltage control signal to the driving module;
the driving module is used for receiving the voltage control signal output by the voltage detection module, obtaining a driving signal and transmitting the driving signal to the main surge protection module;
the main surge protection module is connected with the rear-stage circuit and is used for receiving a driving signal output from the driving module so as to absorb negative-pressure surge and reversely connect and protect the rear-stage circuit.
It is further characterized by:
the voltage detection module includes: the first resistor, the second resistor and the first diode; the first resistor, the second resistor and the first diode are sequentially connected in series and then connected to the two ends of the power supply in parallel, wherein the first resistor is connected to the positive end of the power supply, and the negative electrode of the first diode is connected to the negative end of the power supply; the connection point of the first resistor and the second resistor is connected to the input end of the driving module;
the driving module comprises a first MOS tube, and the first MOS tube is a metal oxide semiconductor MOS tube; the grid electrode of the first MOS tube is connected to the output end of the voltage detection module, the drain electrode of the first MOS tube is connected to the negative end of the power supply, and the source electrode of the first MOS tube is connected to the control end of the main surge protection module;
the main surge protection module comprises a first semiconductor programmable overvoltage protector; the control electrode of the first semiconductor programmable overvoltage protector is connected to the output end of the driving module, the anode of the first semiconductor programmable overvoltage protector is connected to the negative end of the power supply, and the cathode of the first semiconductor programmable overvoltage protector is connected to the positive end of the power supply.
The utility model has the beneficial effects that through the voltage detection module, the driving module and the main surge protection module, if the input of the power input end does not meet the preset condition, the negative pressure surge and the reverse connection protection of the subsequent-stage circuit can be absorbed, so that the kiloampere-level current capacity can be met, the negative pressure surge can be stably eliminated, the lightning protection effect is good, the reverse connection prevention function is realized, the problem that the current capacity of the traditional reverse connection prevention lightning protection circuit is low in cost is effectively solved, and the economic use value is better.
Drawings
FIG. 1 is a schematic circuit diagram of an embodiment of the present utility model;
Detailed Description
In order to make the objects, technical solutions and advantages of the present utility model more apparent, the following detailed description of the embodiments of the present utility model is given with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
The embodiment of the utility model provides a lightning protection circuit, which is shown by referring to FIG. 1, wherein an input end of the lightning protection circuit is connected with a power supply, an output end of the lightning protection circuit is connected with a later-stage circuit, and the lightning protection circuit comprises a voltage detection module 1, a driving module 2 and a main surge protection module 3 which are sequentially connected; the input end of the voltage detection module 1 is connected with the input end of the power supply, the output end of the voltage detection module 1 is connected with the input end of the driving module 2, the output end of the driving module 2 is connected with the control end of the main surge protection module 3, and the output end of the main surge protection module 3 is connected with the output end of the power supply;
the voltage detection module 1 is connected with a power supply, and is used for detecting the voltage of an input end of the power supply, obtaining a voltage control signal and transmitting the voltage control signal to the driving module 2;
the driving module 2 is used for receiving the voltage control signal output from the voltage detection module 1, obtaining a driving signal and transmitting the driving signal to the main surge protection module 3;
the main surge protection module 3 is connected with the rear-stage circuit and is used for receiving a driving signal output from the driving module 2 so as to realize negative-pressure surge absorption and reverse connection protection of the rear-stage circuit when the input of the power input end meets the preset condition;
the preset condition refers to whether the input voltage of the power supply is positive or negative, and whether negative lightning stroke occurs or not.
The voltage detection module 1 comprises a first resistor R1, a second resistor R2 and a first diode D1; the first resistor R1, the second resistor R2 and the first diode D1 are sequentially connected in series and then connected to two ends of a power supply in parallel, wherein the first resistor R1 is connected to the positive end of the power supply, and the negative electrode of the first diode D1 is connected to the negative end of the power supply; the connection point of the first resistor R1 and the second resistor R2 is connected to the input end of the driving module 2; the driving module 2 comprises a first MOS tube Q1, and a metal oxide semiconductor MOS tube adopted by the first MOS tube Q1; the grid electrode of the first MOS tube Q1 is connected to the output end of the voltage detection module 1, the drain electrode of the first MOS tube Q1 is connected to the negative end of the power supply, and the source electrode of the first MOS tube Q1 is connected to the control end of the main surge protection module 3; the main surge protection module 3 comprises a first semiconductor programmable overvoltage protector U1; the control electrode of the first semiconductor programmable overvoltage protector U1 is connected to the output end of the driving module 2, the anode of the first semiconductor programmable overvoltage protector U1 is connected to the negative end of the power supply, and the cathode of the first semiconductor programmable overvoltage protector U1 is connected to the positive end of the power supply.
A lightning protection method comprising the steps of:
under the condition that the input voltage of the power supply is positive voltage input, the voltage control signal output by the voltage detection module 1 controls the driving module 2 to be conducted, and the driving signal generated by the driving module 2 drives the main surge protection module 3 to be conducted from anode to cathode under the set condition, wherein the set condition is that: under the condition that the input voltage of the power supply is positive voltage input and negative lightning stroke occurs, the anode and the cathode of the first semiconductor programmable overvoltage protector are conducted, and the first semiconductor programmable overvoltage protector absorbs the surge energy of the negative lightning stroke;
under the condition that the input voltage of the power supply is positive voltage input, the voltage control signal output by the voltage detection module 1 controls the drive module 2 to be conducted, and the drive signal generated by the drive module 2 drives the control electrode of the first semiconductor programmable overvoltage protector to be conducted with the anode so as to realize self-bias;
under the condition that the input voltage of the power supply is negative pressure input, the voltage control signal output by the voltage detection module 1 controls the driving module 2 to cut off, and the driving signal generated by the driving module 2 drives the control electrode of the first semiconductor programmable overvoltage protector to be in a high-resistance suspension state and lose self-bias, the anode and the cathode of the first semiconductor programmable overvoltage protector are not conducted, and reverse connection protection is achieved.
The working principle of the present utility model is that,
when the input voltage of the power supply is positive voltage input, the first diode D1 is conducted in the forward direction, and positive voltage is generated between the second resistor R2 and two ends of the first diode D1 and used as an input control signal of the driving module 2; when the input voltage of the power supply is negative voltage input, the first diode D1 is reversely cut off, and the voltage at two ends of the first resistor R1 is approximately equal to zero volt and is also used as an input control signal of the driving module 2;
when the input voltage of the power supply is positive voltage input, the voltage detection module 1 outputs a positive voltage control signal to the grid electrode of the first MOS tube Q1, and the first MOS tube Q1 is conducted; when the input voltage of the power supply is negative-pressure input, the voltage detection module 1 outputs a control signal which is approximately equal to zero volt to the grid electrode of the first MOS tube Q1, and the first MOS tube Q1 is cut off;
when the input voltage of the power supply is positive voltage input, the first MOS tube Q1 is conducted, the control electrode of the first semiconductor programmable overvoltage protector U1 is electrically connected with the anode to realize self-bias, and when negative lightning stroke occurs, the anode of the first semiconductor programmable overvoltage protector U1 is conducted to the cathode, so that the lightning stroke energy is absorbed by the first semiconductor programmable overvoltage protector U1 to play a role in negative surge protection; when the input voltage of the power supply is negative pressure input, the first MOS tube Q1 is cut off, the control electrode of the first semiconductor programmable overvoltage protector U1 is in a high-resistance suspension state and loses self-bias, and the anode of the first semiconductor programmable overvoltage protector U1 is cut off from the cathode to play a role in preventing reverse connection.
In summary, the lightning protection structure provided by the embodiment of the utility model has the advantages that the inherent low internal resistance characteristic of the adopted semiconductor programmable overvoltage protector can meet the kiloampere level current capacity, the residual voltage after one lightning protection can be stably eliminated, the lightning protection structure has a good lightning protection effect, the reverse connection prevention function is realized, and the problem that the current capacity of the existing reverse connection prevention lightning protection circuit is low and the cost is high is effectively solved. The embodiment of the utility model is applied to the design of the lightning protection circuit, has the functions of lightning protection and reverse connection prevention, does not need to separately design a reverse connection prevention circuit, and can reduce the cost and the space layout.
In fig. 1, vi is the input terminal voltage of the power supply, and V0 is the output terminal voltage of the power supply.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (4)
1. The utility model provides a lightning protection circuit, input is connected with the power, and the output is connected with the later stage circuit, its characterized in that: the device comprises a voltage detection module, a driving module and a main surge protection module which are connected in sequence;
the voltage detection module is connected with a power supply, and is used for detecting the voltage of the input end of the power supply, obtaining a voltage control signal and transmitting the voltage control signal to the driving module;
the driving module is used for receiving the voltage control signal output by the voltage detection module, obtaining a driving signal and transmitting the driving signal to the main surge protection module;
the main surge protection module is connected with the rear-stage circuit and is used for receiving a driving signal output from the driving module so as to absorb negative-pressure surge and reversely connect and protect the rear-stage circuit.
2. A lightning protection circuit according to claim 1 wherein: the voltage detection module includes: the first resistor, the second resistor and the first diode; the first resistor, the second resistor and the first diode are sequentially connected in series and then connected to the two ends of the power supply in parallel, wherein the first resistor is connected to the positive end of the power supply, and the negative electrode of the first diode is connected to the negative end of the power supply; the connection point of the first resistor and the second resistor is connected to the input end of the driving module.
3. A lightning protection circuit according to claim 1 wherein: the driving module comprises a first MOS tube, and the first MOS tube is a metal oxide semiconductor MOS tube; the grid electrode of the first MOS tube is connected to the output end of the voltage detection module, the drain electrode of the first MOS tube is connected to the negative end of the power supply, and the source electrode of the first MOS tube is connected to the control end of the main surge protection module.
4. A lightning protection circuit according to claim 1 wherein: the main surge protection module comprises a first semiconductor programmable overvoltage protector; the control electrode of the first semiconductor programmable overvoltage protector is connected to the output end of the driving module, the anode of the first semiconductor programmable overvoltage protector is connected to the negative end of the power supply, and the cathode of the first semiconductor programmable overvoltage protector is connected to the positive end of the power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320631222.8U CN219739961U (en) | 2023-03-28 | 2023-03-28 | Lightning protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320631222.8U CN219739961U (en) | 2023-03-28 | 2023-03-28 | Lightning protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219739961U true CN219739961U (en) | 2023-09-22 |
Family
ID=88026031
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320631222.8U Active CN219739961U (en) | 2023-03-28 | 2023-03-28 | Lightning protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219739961U (en) |
-
2023
- 2023-03-28 CN CN202320631222.8U patent/CN219739961U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102684652B (en) | The synchronized-pulse control circuit of anti-MCU or drive IC fault | |
| CN203415975U (en) | Two-way surge protection circuit | |
| CN211908364U (en) | Multistage lightning surge protection circuit for direct-current power supply of product in power industry | |
| CN103855765A (en) | Battery management system protecting device preventing over-voltage impact | |
| CN110492439A (en) | Protection circuit suitable for high-power SiCMOSFET | |
| CN218386788U (en) | Power-off circuit of low-voltage direct-current power supply | |
| US20090231772A1 (en) | Car charger and surge protection device thereof | |
| CN105552828A (en) | Self-powered bidirectional direct-current solid-state circuitbreaker | |
| CN107947557A (en) | A kind of soft starting circuit of anti-over-pressed, under-voltage surge | |
| CN108134514A (en) | Power MOS pipe lets out discharge protection circuit in a kind of inverter circuit | |
| CN2577503Y (en) | Over voltage protection device of single-phase bridge inverter for medium voltage frequency transformer | |
| CN219739961U (en) | Lightning protection circuit | |
| CN206595713U (en) | A kind of surge protection circuit | |
| CN101989742A (en) | No-load protection circuit for capacitor step-down | |
| CN203027132U (en) | Multifunctional pre-stage start control circuit of switching power supply | |
| CN112271788A (en) | Lithium battery charging management system and method | |
| CN116111568A (en) | Lightning protection circuit and method | |
| CN217486178U (en) | Reverse connection preventing circuit for direct current input | |
| CN203352131U (en) | Port with over-current protection and surge prevention functions | |
| CN2865136Y (en) | Transistor switch protection circuit | |
| CN204758768U (en) | IGBT overflows failure detector circuit | |
| CN203691022U (en) | Overvoltage impact preventing battery management system protection device | |
| CN218783573U (en) | Inverter and photovoltaic system | |
| CN101345418A (en) | Electricity disturbance absorption circuit of vehicle-mounted power supply | |
| CN206640308U (en) | A kind of Vehicular power protective circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |