CN110797853A - Lightning protection circuit and lightning protection street lamp - Google Patents
Lightning protection circuit and lightning protection street lamp Download PDFInfo
- Publication number
- CN110797853A CN110797853A CN201911146127.3A CN201911146127A CN110797853A CN 110797853 A CN110797853 A CN 110797853A CN 201911146127 A CN201911146127 A CN 201911146127A CN 110797853 A CN110797853 A CN 110797853A
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- lightning protection
- output end
- circuit
- piezoresistor
- thermistor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a lightning protection circuit and a lightning protection street lamp, relating to the technical field of circuit lightning protection, and the key points of the technical scheme are as follows: including connecting at anodal fuse F1 of power, fuse F1's output is connected with piezo-resistor's input, and piezo-resistor's output is connected on the power negative pole, and piezo-resistor's output is connected at the input of load, and the output of load is connected at the power negative pole. The lightning protection circuit is arranged in the circuit, so that the technical problem that the lightning rod or the lightning arrester is complex to install is solved.
Description
Technical Field
The invention relates to the technical field of circuit lightning protection, in particular to a lightning protection circuit and a lightning protection street lamp.
Background
The lightning voltage is very big, often can appear in life that the thunder and lightning damages the condition of circuit.
In the prior art, lightning protection of strong current, weak current or commercial power is performed through a lightning rod or a lightning protector, and the lightning is short-circuited by the lightning protector or the lightning rod so as to protect a working circuit.
The defects in the prior art are as follows: the installation of the lightning rod or arrester is relatively complicated.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to: the lightning protection circuit and the lightning protection street lamp have the advantages that the circuit has the lightning protection function and replaces a lightning rod or a lightning protector.
The technical scheme includes that the lightning protection circuit comprises a fuse F1 connected to the positive pole of a power supply, the output end of the fuse F1 is connected with the input end of a voltage dependent resistor, the output end of the voltage dependent resistor is connected to the negative pole of the power supply, the output end of the voltage dependent resistor is connected to the input end of a load, and the output end of the load is connected to the negative pole of the power supply.
Through above-mentioned technical scheme, through piezo-resistor's setting, when the high pressure of thunder and lightning got into the circuit, piezo-resistor's electric current surge, and resistance infinitesimal resistance lets most electric current pass through piezo-resistor in other words, and then can reduce the electric current of load, plays the guard action to the load, and is more convenient for installing the arrester once more on the load, lets circuit itself have the effect of lightning protection.
Further, the positive electrode of the power supply is connected with a fuse F2, the output end of the fuse F2 is connected with a voltage dependent resistor MOV4, the output end of the voltage dependent resistor MOV4 is connected with the negative electrode of the power supply, and the input end of the voltage dependent resistor is connected with the input end of the load.
Through above-mentioned technical scheme, through piezo-resistor MOV 4's setting, when the high pressure arrived, two piezo-resistors absorbed energy in turn, and then can let and improve lightning protection effect.
Furthermore, the input end of the piezoresistor MOV1 is connected with a thermistor RT1, the output end of the thermistor RT1 is connected with the input end of a load, and the output end of the piezoresistor is connected with the negative pole of a power supply.
Through the technical scheme, when enough energy cannot be absorbed through any one of the piezoresistors MOV1 and MOV4 after the absorption, the other piezoresistor absorbs the heat, so that the heat can be alternately absorbed, and the thermistor can slow down the absorption of the energy.
Furthermore, the input end of the piezoresistor MOV4 is connected with a thermistor RT2, the output end of the thermistor RT2 is connected with the input end of a load, and the output end of the piezoresistor is connected with the negative pole of a power supply.
Through the technical scheme, after the energy of one piezoresistor is absorbed fully, the voltage applied to the piezoresistor MOV1 is applied to the thermistor RT1, the energy applied to the piezoresistor MOV4 is applied to the thermistor RT2, the buffer can be provided for the piezoresistor, the piezoresistor absorbs the energy again after recovering the energy absorption capacity, the back-and-forth energy consumption is realized, and the lightning protection effect is better.
Further, the output ends of the thermistor RT1 and the thermistor RT2 are connected with a varistor MOV2, and the output end of the varistor MOV2 is connected with the negative electrode of the power supply.
Through the technical scheme, the MOV1 and the MOV2 form first-stage protection, a small part of voltage remaining after the first-stage protection collects energy again through the thermistor RT1, the thermistor RT2 and the varistor MOV2, the thermistor has a good inhibition effect on input high-voltage surge, the MOV2 (the varistor) absorbs part of residual voltage, and the thermistor RT1 and the thermistor RT2 have the effect of limiting current, so that the absorption of the energy of the varistor MOV2 can be slowed down, the time for the varistor MOV2 to absorb the energy is longer, and meanwhile, the time for consuming the energy is provided for the M0V1 varistor and the varistor MOV4 to prepare for next energy absorption. When the varistor MOV2 is no longer absorbing energy, the voltage across the varistor MOV2 is applied through thermistor RT1 and thermistor RT2 is applied across the varistor MOV1 and varistor MOV 4. The piezo-resistor MOV1 and the piezo-resistor MOV4 may in turn re-absorb a part of the energy. The energy absorbed over time is less and less in such a round trip.
Further, the threshold values are different between the piezoresistor MOV1 and/or the piezoresistor MOV4 and/or the piezoresistor MOV 1.
Through the technical scheme, different threshold values can enable different piezoresistors to absorb energy at different starting times, so that the energy can be absorbed more easily and alternately.
A lightning protection street lamp comprises the lightning protection circuit, the LED lamp and the LED driving circuit, wherein the lightning protection circuit is as claimed in any one of claims 1 to 6, and a rectifying circuit is connected between the LED driving circuit and the lightning protection circuit.
Through above-mentioned technical scheme, through the setting of lightning protection circuit, can let the circuit of street lamp have the function of lightning protection, replaced the installation of lightning rod or arrester.
Furthermore, a ripple removing circuit is coupled to the LED lamp.
Through above-mentioned technical scheme, reduce the stroboscopic through removing ripple circuit.
Further, the LED drive circuit comprises an LED drive chip with an output end connected to the LED lamp, and a voltage dependent resistor MOV3 is connected between an input pin of the LED drive chip and the analog ground.
Through above-mentioned technical scheme, through piezo-resistor MOV 3's setting, can improve the lightning protection effect, when overvoltage protection in the lightning protection circuit is not enough, carry out the absorption of energy through MOV3, protect LED drive circuit.
In conclusion, the invention has the following technical effects:
the first stage protection: when a high voltage of 10KV flows into the lightning protection circuit through AC-L, AC-N, the high voltage firstly passes through a circuit consisting of a fuse F1, a piezoresistor MOV4, a fuse F2 and a piezoresistor MOV1, because the absorption capacity and energy of the piezoresistor are different, the voltage at two ends of the piezoresistor MOV4 is increased because the piezoresistor MOV4 absorbs more energy under the assumption that the absorption capacity and energy of the piezoresistor are stronger, the voltage at the two ends of the piezoresistor MOV4 are not higher, the piezoresistor MOV4 cannot absorb more energy, the high voltage applied to the MOV4 passes through the fuse F1, the fuse F2 reaches the threshold of the piezoresistor MOV1, the piezoresistor MOV1 absorbs the high-voltage energy to work, and the piezoresistor MOV4 is replaced by time to consume energy and prepare for absorbing the energy again. When the varistor MOV1 absorbs no further energy, the high voltage across the varistor MOV1 passes through the fuse F2 and the fuse F1 reaches the threshold of the varistor MOV 4. The round trip can absorb more energy than the two piezoresistors which are combined together, and the energy which can be absorbed is less and less along with the time, so that part of high-voltage energy flows into a second-stage protection circuit of the lightning protection device.
And (3) second-stage protection: the rest residual high voltage passes through the thermistor RT1, the thermistor RT2 and the varistor MOV2, the thermistor has good inhibition effect on the input high voltage surge, the varistor MOV2 absorbs part of residual voltage, and the thermistor RT1 and the thermistor RT2 have the effect of limiting current, so that the absorption of energy of the varistor MOV2 can be slowed down, the time for the varistor MOV2 to absorb energy is longer, and meanwhile, the time for energy consumption is provided for the varistor MOV1 and the varistor MOV4, and the preparation is made for next energy absorption. When the voltage dependent resistor MOV2 is no longer absorbing energy, the voltage applied across the voltage dependent resistor MOV2 is passed through thermistor RT1 and thermistor RT2 is applied across the voltage dependent resistors MOV1 and MOV 4. The piezo-resistor MOV1 and the piezo-resistor MOV4 may in turn re-absorb a part of the energy. The energy absorbed in such a round trip over time will be less and less, so that only a very small part of the high voltage energy flows into the third stage protection circuit of our lightning protection device.
And (3) third-stage protection: the remaining residual voltage is already quite small but is absorbed by the varistor MOV3 in order to further protect the circuit and to ensure the safety of the circuit.
Through the protection in three stages, the damage of thunder and lightning to the circuit can be effectively prevented.
Drawings
Fig. 1 is a circuit diagram of a lightning protection street lamp in embodiment 1;
fig. 2 is a circuit diagram of a ripple removing circuit in embodiment 1;
fig. 3 is a partial circuit diagram of the lightning protection street lamp according to the embodiment 2;
fig. 4 is a partial circuit diagram of the lightning protection street lamp according to the embodiment 3;
FIG. 5 is a partial circuit diagram of the lightning protection street lamp according to embodiment 4;
fig. 6 is a partial circuit diagram of the lightning protection street lamp according to embodiment 5.
Reference numerals: 1. a lightning protection circuit; 2. a light source control circuit; 3. a filter circuit; 4. and a ripple removing circuit.
Detailed Description
The light source control circuit 2 includes an LED driving chip, the model is MT7842 in this embodiment, the LED driving chip has 8 pins, the first pin is connected with a capacitor C4, the output end of the capacitor C4 is connected with digital ground, the third pin is connected with the input end of a capacitor C3, the output end of the capacitor C3 is connected with digital ground, the second pin is connected with the input end of a resistor R7, the output end of the resistor R7 is connected with a resistor R8, the output end of the resistor R8 is connected with the input end of the LED lamp, the input end of a resistor R6 is connected between the second pin and the input end of the resistor R7, the output end of the resistor R6 is connected with digital ground, and the output end of the resistor R6 is connected with.
The fourth pin is connected with the anode of a diode D2, and the cathode of a diode D2 is connected with the analog ground. The fourth pin is connected with the input ends of two resistors R4 and R5 which are connected in parallel, the input ends of the two resistors R4 and R5 which are connected in parallel are connected with the input end of a diode D2, the output ends of the two resistors R4 and R5 which are connected in parallel are connected with a digital ground, the second pin is connected with a capacitor C5, and the output end of the capacitor C5 is connected with the digital ground.
The output end of the capacitor C5 is connected with the input end of an inductor L-EE10, and the output end of the inductor is connected with the input end of the LED lamp.
The output end of the inductor is connected with the input end of a capacitor demodulation capacitor T1, and the output end of the demodulation capacitor T1 is connected to the analog ground.
The input end of the LED is connected with the input end of a resistor R9, the output end of a resistor R9 is connected to the analog ground, and the output end of R9 is connected to the input end of the LED lamp.
And the pin five is connected with the output end of the AC/DC converter.
The AC/DC converter is provided with four pins, wherein a third pin and a fourth pin are input ends and are respectively connected with the positive pole and the negative pole of alternating current, a first pin and a second pin are output ends of a direct current power supply, a second pin is the positive pole of the direct current power supply, a first pin is the negative pole AC-L of the direct current power supply, and a first pin is connected with analog ground.
And a pin V of the LED driving chip is connected to a pin II of the AC/DC converter. The No. 6 image of the LED driving chip is connected to the No. five pin of the LED driving chip. The six pins of the LED driving chip are connected with the input end of a capacitor C2, and the output end of a capacitor C2 is connected with the analog ground.
The fifth pin of the LED driving chip is connected with the input end of a resistor R2, the output end of a resistor R2 is connected with the input end of a resistor R3, the output end of the resistor R3 is connected with the anode of an electrolytic capacitor CE1, and the cathode of the electrolytic capacitor CE1 is connected with the analog ground.
The pin five of the LED driving chip is connected with the anode of a diode D4, and the cathode of a diode D4 is connected with the anode of an electrolytic capacitor CE 1.
The fourth pin of the AC/DC converter is connected to the anode of a diode D1, and the cathode of a diode D1 is connected to the anode of an electrolytic capacitor CE 1.
And a fourth pin of the AC/DC converter is used as the input end of the LED driving circuit and connected to the output end of the lightning protection circuit 1, and a third sound effect of the AC/DC converter is connected to the negative electrode of the lightning protection circuit 1.
The positive pole of LED lamp is connected with the input that removes ripple circuit 4, and the negative pole at the LED lamp is connected to the output that removes ripple circuit 4.
Remove ripple circuit 4 and include that the input is connected at anodal resistance R10 of LED lamp, resistance R10's output is connected with, the model is the ripple chip that removes of MT1729, it has eight pins to remove the ripple chip, wherein, it is connected with resistance R10's output to remove No. 8 pins of ripple chip, resistance R10's output is connected with electric capacity C6's input, electric capacity C6's output is connected with simulation ground, it connects on simulation ground to remove No. six pins of ripple chip, it is connected with electric capacity C7's input to remove No. seven pins of ripple chip, electric capacity C7's output is connected with simulation ground, it is connected with No. 4 pins of removing the ripple chip to remove No. three pins of ripple chip, it connects the negative pole at the load to remove No. four pins of ripple chip, the load is the LED lamp in this embodiment, it connects on the negative pole of LED.
The first pin of the ripple removing chip is connected with the input end of a resistor R13, and the output end of the resistor R13 is connected to the negative electrode of the LED lamp.
The second pin of the ripple removing chip is connected with the input end of a resistor R11, the output end of the resistor R11 is connected with the analog ground, the input end of a resistor R11 is connected with the input end of a resistor R12, and the output end of the resistor R12 is connected with the analog ground.
A lightning protection circuit 1 comprises a fuse F1 with an input end connected to a power supply anode AC-L, wherein an output end of the fuse F1 is connected with a piezoresistor MOV1, the piezoresistor is a zinc oxide piezoresistor with the model of 10D471, an output end of the piezoresistor MOV1 is connected to a power supply cathode AC-N, an output end of the fuse is connected with an input end of a load, and the load is a light source control circuit 2 in the embodiment.
A filter circuit 3 is connected between the lightning protection circuit 1 and the light source control circuit 2. The filter circuit 3 comprises an inductor L1, the input end of the inductor L1 is connected with the output end of the thermistor RT1, a resistor R1 is connected in parallel with the two ends of the inductor, the output end of the thermistor RT1 is connected with the input end of an inductor of the conjugate inductor LF1, the output end of the conjugate inductor LF1 is connected with the fourth pin of the AC/DC conversion chip, one end of the other conjugate inductor LF1 is connected with the power supply negative pole AC-N, and the output end of the conjugate inductor LF1 is connected with the third pin of the AC/DC conversion chip.
The output end of the thermistor is connected with the input end of a capacitor C1, and the output end of a capacitor C1 is connected with the analog ground.
The resistor R14 is connected in parallel with two ends of the capacitor C1.
The working principle of the piezoresistor is as follows: when the voltage applied to the varistor is below its threshold value, the current flowing through it is extremely small, corresponding to a resistance of infinite value. That is, when the voltage across it is below its threshold, it behaves as an open-state switch. When the voltage across the varistor exceeds its threshold, the current flowing through it increases sharply, corresponding to a resistance of infinitesimal magnitude. That is, when the voltage applied to it is above its threshold, it behaves as a closed-state switch.
The working principle of the thermistor is as follows: the thermistor has shorter operation time and smaller holding current and operation current when the ambient temperature is relatively higher. When the circuit works normally, the temperature of the thermistor is close to the room temperature, the resistance is small, the thermistor is connected in series in the circuit and cannot block the current from passing through, when the circuit has over-current due to fault, the temperature of the thermistor rises due to the increase of heating power, when the temperature exceeds the switching temperature, the resistance can increase sharply instantly, and the current in the loop is reduced to a safe value rapidly.
The first stage protection: when 10KV high voltage enters ACL and ACN and passes through a resistance wire F1, a piezoresistor MOV1, a fuse F2 and a piezoresistor MOV4 to form a loop, the resistance value of the piezoresistor is changed from large to small when the high potential is reached and the current is changed from small to large due to the characteristics of the piezoresistor, a part of voltage is absorbed, and the rest residual voltage flows to a stage.
And (3) second-stage protection: the rest residual voltage is not absorbed, when the residual voltage passes through the thermistors RT1, RT2 and MOV2, the current is changed from small to large due to the characteristics of the NTC thermistors, the MOV2 absorbs a part of residual voltage, and when the temperature of the NTC thermistors exceeds the switching temperature under the condition of large current, the resistance is suddenly increased, so that the circuit forms an open circuit, the current is quickly reduced to a safe value, the recovery time of the NTC is quick, the recovery time of the thermistors and the piezoresistors is crossed, the residual voltage can form a circuit back and forth at F1, RT1, MOV2, F2, RT2 and MOV2, the residual voltage is repeatedly absorbed, and the rest residual voltage flows to a stage.
And (3) third-stage protection: the remaining residual voltage is already quite small but is absorbed by MOV3 in order to further protect the circuit and ensure the safety of the circuit.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (9)
1. A lightning protection circuit (1), characterized by: the power supply voltage regulation circuit comprises a fuse F1 connected to the positive pole of a power supply, wherein the output end of the fuse F1 is connected with the input end of a piezoresistor MOV4, the output end of the piezoresistor MOV4 is connected to the negative pole of the power supply, the output end of the piezoresistor MOV4 is connected to the input end of a load, and the output end of the load is connected to the negative pole of the power supply.
2. A lightning protection circuit (1) according to claim 1, characterized in that: the positive pole of the power supply is connected with a fuse F2, the output end of the fuse F2 is connected with a piezoresistor MOV1, the output end of the piezoresistor MOV1 is connected with the negative pole of the power supply, and the input end of the piezoresistor is connected with the input end of the load.
3. A lightning protection circuit (1) according to claim 1, characterized in that: the input end of the piezoresistor MOV1 is connected with a thermistor RT1, the output end of the thermistor RT1 is connected with the input end of a load, and the output end of the piezoresistor is connected with the negative pole of a power supply.
4. A lightning protection circuit (1) according to claim 1, characterized in that: the input end of the piezoresistor MOV4 is connected with a thermistor RT2, the output end of the thermistor RT2 is connected with the input end of a load, and the output end of the piezoresistor is connected with the negative pole of a power supply.
5. A lightning protection circuit (1) according to claim 4, characterized in that: the output ends of the thermistor RT1 and the thermistor RT2 are connected with a varistor MOV2, and the output end of the varistor MOV2 is connected with the negative electrode of the power supply.
6. A lightning protection circuit (1) according to claim 2, characterized in that: the threshold values are different between the piezo-resistor MOV1 and/or the piezo-resistor MOV4 and/or the piezo-resistor MOV 1.
7. A lightning protection street lamp comprising the lightning protection circuit (1) as claimed in any one of claims 1 to 6, an LED lamp and an LED driving circuit, wherein a rectifying circuit is connected between the LED driving circuit and the lightning protection circuit (1).
8. The lightning protection street lamp according to claim 7, wherein: the LED lamp is also coupled with a ripple removing circuit (4).
9. The lightning protection street lamp according to claim 8, wherein: the LED driving circuit comprises an LED driving chip of which the output end is connected to the LED lamp, and a piezoresistor MOV3 is connected between the input pin of the LED driving chip and the analog ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911146127.3A CN110797853B (en) | 2019-11-21 | 2019-11-21 | Lightning protection circuit and lightning protection street lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911146127.3A CN110797853B (en) | 2019-11-21 | 2019-11-21 | Lightning protection circuit and lightning protection street lamp |
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| Publication Number | Publication Date |
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| CN110797853A true CN110797853A (en) | 2020-02-14 |
| CN110797853B CN110797853B (en) | 2021-12-07 |
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| CN201911146127.3A Active CN110797853B (en) | 2019-11-21 | 2019-11-21 | Lightning protection circuit and lightning protection street lamp |
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| CN201700047U (en) * | 2010-04-02 | 2011-01-05 | 上海古森实业有限公司 | Led lamp driving circuit |
| CN102014557A (en) * | 2010-10-19 | 2011-04-13 | 王子能 | LED dimming power supply |
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