CN220342037U - Lightning-stroke-resistant surge circuit - Google Patents
Lightning-stroke-resistant surge circuit Download PDFInfo
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- CN220342037U CN220342037U CN202321747955.4U CN202321747955U CN220342037U CN 220342037 U CN220342037 U CN 220342037U CN 202321747955 U CN202321747955 U CN 202321747955U CN 220342037 U CN220342037 U CN 220342037U
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- 208000025274 Lightning injury Diseases 0.000 title description 2
- 238000005070 sampling Methods 0.000 claims abstract description 35
- 238000001514 detection method Methods 0.000 claims abstract description 34
- 239000003990 capacitor Substances 0.000 claims description 26
- 230000002441 reversible effect Effects 0.000 claims description 11
- 230000008054 signal transmission Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 230000008094 contradictory effect Effects 0.000 description 1
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Abstract
The utility model discloses an anti-lightning surge circuit, which comprises a voltage detection unit and a control unit, wherein the voltage detection unit is provided with two input ends and an output end, the two input ends of the voltage detection unit are respectively connected with a lightning surge sampling point and a reference voltage, and the output end of the voltage detection unit is electrically connected with the control unit; the voltage detection unit is used for collecting and processing lightning surge sampling points and reference voltages, and then outputting output results to the control unit, so that the output state of the control unit is determined, the signal transmission of the driving circuit is controlled by utilizing the output state of the control unit, overvoltage or overcurrent caused by lightning surge is prevented from entering the driving circuit, the effect of stable and effective protection is achieved, and the circuit structure is simple and the manufacturing cost is effectively reduced.
Description
Technical Field
The utility model relates to the field of circuit protection, in particular to an anti-lightning surge circuit.
Background
Lightning surges are due to the phenomenon of transient high voltage or large current generated when lightning, electronic and electrical switches are operated. Lightning surge finally appears in a circuit as an overvoltage and overcurrent phenomenon, and the energy of the overvoltage and overcurrent phenomenon can instantaneously burn out devices on the circuit. In an internal circuit of a home appliance, a lightning surge phenomenon may occur. The singlechip is used as a control center and is electrically connected with an internal circuit of the electric appliance, and the overvoltage or overcurrent phenomenon caused by lightning surge is processed by receiving or sending a control signal. However, the single chip microcomputer may have delay when processing lightning surge, so that components in the circuit are damaged, and the situation of frying is caused.
Therefore, protection against this is needed. In the prior art, the problem of lightning surge is solved by replacing the singlechip with higher processing speed, but the improved cost is higher, and the stability cannot be ensured.
Disclosure of Invention
Aiming at the defects of the prior art, an anti-lightning surge circuit is provided.
To achieve the above object, the present utility model provides an anti-lightning surge circuit comprising: the lightning surge detection device comprises a voltage detection unit and a control unit, wherein the voltage detection unit is provided with two input ends and an output end, the two input ends of the voltage detection unit are respectively connected with a lightning surge sampling point and a reference voltage, and the output end of the voltage detection unit is electrically connected with the control unit.
According to one embodiment of the utility model, the voltage detection unit comprises a first voltage division module and a first voltage comparison module, wherein two input ends of the first voltage division module are respectively connected with the lightning surge sampling point and the reference voltage, an output end of the first voltage division module is electrically connected with the first voltage comparison module, and the first voltage comparison module is electrically connected with the control unit.
According to an embodiment of the utility model, the first voltage dividing module comprises a plurality of resistors, the first comparing module comprises a first voltage comparator, the lightning surge sampling point and the reference voltage are connected to one ends of the plurality of resistors, the other ends of the plurality of resistors are electrically connected to the input end of the first voltage comparator, and the output end of the first voltage comparator is electrically connected with the control unit.
According to an embodiment of the utility model, the control unit comprises a second voltage dividing module and a second comparing module, the second voltage dividing module is electrically connected with the second comparing module, the output end of the voltage detecting unit is electrically connected with the second voltage dividing module, and the reference voltage is connected with the second voltage dividing module.
According to an embodiment of the present utility model, the second voltage dividing module includes a plurality of resistors and a capacitor, the second comparing module includes a second voltage comparator and a third voltage comparator, the plurality of resistors and the capacitor are electrically connected to the input terminals of the second voltage comparator and the third voltage comparator, and the plurality of resistors and the capacitor are electrically connected to the output terminal of the voltage detecting unit.
According to an embodiment of the present utility model, the first voltage dividing module includes a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4, the positive input end of the first voltage comparator is electrically connected to the reference voltage, and the first resistor R1 is electrically connected therebetween; the reverse input end of the first voltage comparator is electrically connected with the lightning surge sampling point, the second resistor R2 is electrically connected between the first voltage comparator and the lightning surge sampling point, one end of the third resistor R3 is electrically connected with a node between the first voltage comparator and the first resistor R1, one end of the fourth resistor R4 is electrically connected with a node between the first voltage comparator and the second resistor R2, the other end of the third resistor R3 is electrically connected with the other end of the fourth resistor R4 and is commonly grounded, and the output end of the first voltage comparator is electrically connected with the control unit.
According to an embodiment of the present utility model, the second voltage dividing module includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and a capacitor C1, wherein the output end of the first voltage comparator is respectively connected to the fifth resistor R5 and the capacitor C1, a node between the fifth resistor R5 and the capacitor C1 is electrically connected to the positive input ends of the second voltage comparator and the third voltage comparator, one end of the other end of the fifth resistor R5 and one end of the sixth resistor R6 are commonly connected to a reference voltage, the other end of the sixth resistor R6 is electrically connected to one end of the seventh resistor R7, the midpoints of the two connections are respectively connected to the reverse input ends of the second voltage comparator and the third voltage comparator, and the other end of the seventh resistor R7 is electrically connected to the other end of the capacitor C1 and commonly grounded.
According to an embodiment of the present utility model, the first voltage comparator, the second voltage comparator and the third voltage comparator are all LM393.
According to one embodiment of the present utility model, the reference voltage is +5V.
The utility model has the advantages that the voltage detection unit 1 is used for collecting and processing lightning surge sampling points and reference voltages, and then outputting output results to the control unit, so as to determine the output state of the control unit, and control the signal transmission of the driving circuit by utilizing the output state of the control unit, so that overvoltage or overcurrent caused by lightning surge is prevented from entering the driving circuit, stable and effective protection effect is realized, and the circuit structure is simple and effective, and the manufacturing cost is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
FIG. 1 is a circuit block diagram of an anti-lightning surge in an embodiment;
FIG. 2 is a block diagram of a specific application of a lightning surge protection circuit diagram in an embodiment.
Description of the reference numerals
1-a voltage detection unit; 2-a control unit; 11-a first voltage dividing module; 12-a first comparison module; 21-a second voltage dividing module; 22-a second comparison module.
Detailed Description
Various embodiments of the utility model are disclosed in the following drawings, in which details of the practice are set forth in the following description for the purpose of clarity. However, it should be understood that these practical details are not to be taken as limiting the utility model. That is, in some embodiments of the utility model, these practical details are unnecessary. Moreover, for the purpose of simplifying the drawings, some conventional structures and components are shown in the drawings in a simplified schematic manner.
In addition, the descriptions of the "first," "second," and the like, herein are for descriptive purposes only and are not intended to be specifically construed as order or sequence, nor are they intended to limit the utility model solely for distinguishing between components or operations described in the same technical term, but are not to be construed as indicating or implying any relative importance or order of such features. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.
As shown in fig. 1, fig. 1 is a block diagram of a circuit for lightning surge protection. The lightning surge protection circuit provided by the embodiment comprises a voltage detection unit 1 and a control unit 2.
The voltage detection unit 1 is used for comparing the magnitudes of two input voltages. Specifically, the voltage detection unit is provided with two input ends and an output end, the two input ends are respectively connected with the reference voltage and the lightning surge sampling point, and the output state of the output end is controlled by comparing the two input ends.
The output end of the voltage detection unit 1 is electrically connected with the control unit 2. After the reference voltage and the lightning surge sampling point are compared by the voltage detection unit 1, a signal is output from the output end of the voltage detection single source and is transmitted into the control unit 2, so that the output state of the control unit 2 is controlled.
Specifically, when the voltage value of the lightning surge sampling point is greater than the voltage value of the reference voltage, the output state of the voltage detection unit 1 is low, resulting in that the control unit 2 also outputs the state as low.
When the voltage value of the lightning surge sampling point is smaller than the voltage value of the reference voltage, the output state of the voltage detection unit 1 is in a high-resistance state, so that the output state of the control unit 2 is also in the high-resistance state.
Referring to fig. 2, fig. 2 is a block diagram of an anti-lightning surge circuit diagram, in this embodiment, an output end of the control unit 2 is electrically connected to the driving circuit, so as to control a signal transmission state of the driving circuit. When the voltage detection unit 1 outputs a low level, the control unit 2 outputs a low level as well. At this time, the driving circuit cannot transmit driving signals, and the driving is turned off rapidly, so that overvoltage or overcurrent caused by lightning surge cannot enter the control circuit, and the condition that components of the circuit are damaged by the lightning surge is avoided.
When the output of the voltage detecting unit 1 is in a high-resistance state, the output end of the control unit 2 is also in a high-resistance state. At this time, the driving circuit normally transmits a driving signal and performs driving control.
The voltage detection unit 1 includes a first voltage division module 11 and a first voltage comparison module 12, where the first voltage division module 11 is configured to divide an input value of two input ends of the first voltage comparison module 12. The two input ends of the first voltage dividing module 11 are respectively connected with the lightning surge sampling point and the reference voltage, the output end of the first voltage dividing module 11 is electrically connected with the first voltage comparing module 12, and the control unit of the first voltage comparing module 12 is electrically connected.
Specifically, one input end of the first voltage dividing module collects a voltage value of a lightning surge sampling point, and the other input end of the first voltage dividing module collects a reference voltage, and further, the reference voltage value is set to be +5V.
The first voltage dividing module 11 includes a plurality of resistors, the first comparing module 12 includes a first voltage comparator, the lightning surge sampling point and the reference voltage are connected to one ends of the plurality of resistors, the other ends of the plurality of resistors are electrically connected to an input end of the first voltage comparator, and an output end of the first voltage comparator is electrically connected to the control unit. That is, the lightning surge sampling point and the reference voltage enter the input end of the first voltage comparator after passing through a plurality of resistors.
Specifically, the first voltage dividing module 11 includes a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4.
The first voltage comparator is provided with a forward input end and a reverse input end, the forward input end of the first voltage comparator is electrically connected with the reference voltage, and the first resistor R1 is electrically connected between the forward input end of the first voltage comparator and the reference voltage. Further, the reference voltage is set to +5v. In this embodiment, the first resistor R1 is connected in series between the reference voltage and the positive input terminal of the first comparator, that is, one end of the first resistor R1 is electrically connected to the reference voltage as the input terminal.
The reverse input end of the first voltage comparator is electrically connected with the lightning surge sampling point, and the second resistor R2 is electrically connected between the reverse input end and the lightning surge sampling point. In this embodiment, the second resistor R2 is connected in series between the inverting input terminal of the first comparator and the lightning surge sampling point, that is, one end of the second resistor R2 is used as the input terminal of the lightning surge sampling point, and the other end thereof is connected to the inverting terminal of the first voltage comparator.
The first resistor R1 and the second resistor R2 are respectively used as input ends of a reference voltage and a lightning surge sampling point, so that the first voltage comparator is prevented from being damaged by direct connection, and the voltage division effect is achieved.
The reference voltage and the lightning surge sampling point are input through the first resistor R1 and the second resistor R2 respectively, and then are input into the first voltage comparator after being further divided. One end of the third resistor R3 is electrically connected to the node between the first voltage comparator and the R1, one end of the fourth resistor R4 is electrically connected to the reception between the first voltage comparator and the R2, and the other end of the third resistor R3 is electrically connected to the other end of the fourth resistor R4 and is commonly grounded.
After the reference voltage and the lightning surge sampling point are divided by the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R2 respectively, the forward input end of the first voltage comparator collects the divided reference voltage, the reverse input end of the first voltage comparator collects the divided voltage of the lightning surge sampling point, the first voltage comparator compares the values of the reference voltage and the lightning surge sampling point, when the voltage collected by the forward input end is larger than the voltage collected by the reverse end, the output end of the first voltage comparator is in a high-resistance state, and when the voltage collected by the forward input end is smaller than the voltage collected by the reverse input end, the output of the first voltage comparator is in a low level.
The output end of the first voltage comparator is electrically connected with the control unit 2, and the control unit 2 is controlled by the output state of the first voltage comparator.
With continued reference to fig. 2, the control unit 2 includes a second voltage dividing module 21 and a second comparing module 22, the second voltage dividing module 21 is electrically connected to the second comparing module 22, and an output end of the voltage detecting unit 1 is electrically connected to the second voltage dividing module 21. That is, the output end of the first voltage comparator is electrically connected to the second voltage dividing module 21.
The second voltage dividing module 21 includes a plurality of resistors and a capacitor, and the second comparing module 22 includes a second voltage comparator and a third voltage comparator.
The resistors are coupled to the capacitors, and the output end of the voltage detection unit 1 is electrically connected to the nodes between the resistors and the capacitors. The nodes between the resistors and the capacitors are also electrically connected with the input ends of the second comparator and the third comparator.
Specifically, the second voltage dividing module 21 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a capacitor C1, a second voltage comparator, and a third voltage comparator. The output end of the first voltage comparator is respectively connected with the fifth resistor R5 and the capacitor C1, a node between the fifth resistor R5 and the capacitor C1 is electrically connected with the positive input ends of the second voltage comparator and the third voltage comparator, and the other end of the fifth resistor R5 and one end of the sixth resistor R6 are commonly connected with the reference voltage. Further, the reference voltage has a value of +5v.
The other end of the sixth resistor R6 is electrically connected with one end of the seventh resistor R7, the midpoints of the sixth resistor R6 and the seventh resistor R7 are respectively connected with the reverse input ends of the second voltage comparator and the third voltage comparator, and the other end of the seventh resistor R7 is electrically connected with the other end of the electric resistor and is commonly grounded.
The positive input ends of the second voltage comparator and the third voltage comparator collect the output voltage of the first voltage comparator divided by the fifth resistor R5 and the capacitor C1, and the negative input ends of the second voltage comparator and the third voltage comparator collect the reference voltage divided by the sixth resistor R6 and the seventh resistor R7. That is, the value input to the positive input terminal of the second voltage comparator is the same as the value input to the positive input terminal of the third voltage comparator, and the value input to the negative input terminal of the second voltage comparator is the same as the value input to the negative input terminal of the third voltage comparator.
Preferably, the first voltage comparator, the second voltage comparator and the third voltage comparator are all LM393.
When the output end of the first voltage comparator outputs a high resistance state, the fifth resistor R5 is connected with the reference voltage, and the fifth resistor R5 serves as a pull-up resistor to pull up the voltage value of the output end of the first voltage comparator, so that the output state of the first voltage comparator changes to a high level. At this time, the capacitor C1 starts to charge, and the output voltage of the first voltage comparator is divided by the fifth resistor R2 and the capacitor C1 and is input to the positive input terminals of the second voltage comparator and the third voltage comparator. The reference voltage is divided by the sixth resistors R6 and R7 and then input to the inverting input terminal of the second voltage comparator.
The second voltage comparator and the third comparator compare the values inputted from the input terminals. When the output end of the first voltage comparator outputs a high level, the values of the positive input ends of the second voltage comparator and the third voltage comparator are larger than the values of the negative input ends. At this time, the output end of the second voltage comparator and the output end of the third voltage comparator are in a high-resistance state.
When the output end of the first voltage comparator is at a low level, the capacitor C1 is discharged. The values of the positive input ends of the second voltage comparator and the third voltage comparator are smaller than the value of the negative input end, and the output ends of the second voltage comparator and the third comparator are output to be low level.
With reference to fig. 2, in the present embodiment, the output end of the second voltage comparator and the output end of the third voltage comparator are respectively electrically connected to the driving circuit. And controlling the cut-off and the on states of the driving circuit through the value output by the output end.
When the output of the second voltage comparator and the output of the third voltage comparator are in a high resistance state, the driving circuit is in a conducting state, and when the output of the second voltage comparator and the output of the third voltage comparator are in a low level, the driving circuit is in a cut-off state.
Specifically, the singlechip transmits PPG signals to the IGBT driving module through a PWMH interface and a PWML interface. The output of the control unit 2 is connected between the singlechip and the IGBT driving module. When the value of the lightning surge sampling point is larger than the reference voltage value, the voltage detection unit 1 outputs a low-level signal, the control unit 2 also outputs a low level, and at the moment, the singlechip cannot transmit a PPG signal to the IGBT driving module, and PPG driving is further closed. Transient high voltage caused by lightning surge cannot enter the driving circuit, and the driving circuit is protected.
When the value of the lightning surge sampling point is lower than the reference voltage value, the voltage detection unit 1 outputs a high-level signal after the effect of the fifth resistor R5, the control unit 2 outputs the high-resistance state, and the singlechip can normally transmit the PPG signal to the IGBT driving module at the moment, and the driving circuit normally operates.
That is, when the value of the lightning surge sampling point is a normal value, the PPG signal transmission is normal, so that the driving circuit operates normally; when the over-current or over-voltage phenomenon is caused by lightning surge, the lightning surge sampling point and the reference voltage are respectively processed by the voltage detection unit 1 and the control unit 2 to output a low-level signal, so that the signal transmission of the driving circuit is stopped, the inside of the circuit and the components thereof are prevented from being damaged by the over-voltage or over-current phenomenon, and timely and effective protection measures are carried out.
In summary, the voltage detection unit 1 is configured to collect a lightning surge sampling point and a reference voltage, and the value divided by the first voltage division module 11 is input to the first voltage comparator, the first voltage comparator compares the two values and outputs an output result to the control unit 2, so as to determine an output state of the control unit 2, and control signal transmission or cutoff of the driving circuit by using the output state of the control unit 2, thereby preventing lightning surge from entering the driving circuit and effectively preventing the lightning surge from damaging components inside the circuit.
Through the anti-lightning surge circuit, overvoltage or overcurrent caused by lightning surge can be timely treated, the lightning surge is stably and effectively protected, and the anti-lightning surge circuit consisting of a plurality of resistors, three LM393 voltage comparators and a capacitor C1 reduces the protection cost.
The foregoing description is only illustrative of the utility model and is not to be construed as limiting the utility model. Various modifications and variations of the present utility model will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, or the like, which is within the spirit and principles of the present utility model, should be included in the scope of the claims of the present utility model.
Claims (9)
1. An anti-lightning surge circuit, comprising: the lightning surge detection device comprises a voltage detection unit (1) and a control unit (2), wherein the voltage detection unit (1) is provided with two input ends and one output end, the two input ends of the voltage detection unit (1) are respectively connected with a lightning surge sampling point and a reference voltage, and the output end of the voltage detection unit (1) is electrically connected with the control unit (2).
2. The lightning surge protection circuit according to claim 1, wherein the voltage detection unit (1) comprises a first voltage division module (11) and a first voltage comparison module (12), two input ends of the first voltage division module (11) are respectively connected with the lightning surge sampling point and the reference voltage, an output end of the first voltage division module (11) is electrically connected with the first voltage comparison module (12), and the first voltage comparison module (12) is electrically connected with the control unit (2).
3. The lightning surge protection circuit according to claim 2, wherein the first voltage dividing module (11) comprises a plurality of resistors, the first voltage comparing module (12) comprises a first voltage comparator, the lightning surge sampling point and the reference voltage are connected to one ends of the plurality of resistors, the other ends of the plurality of resistors are electrically connected to the input end of the first voltage comparator, and the output end of the first voltage comparator is electrically connected to the control unit (2).
4. A lightning surge protection circuit according to claim 3, wherein the control unit (2) comprises a second voltage dividing module (21) and a second comparing module (22), the second voltage dividing module (21) is electrically connected with the second comparing module (22), and the output end of the voltage detecting unit (1) is electrically connected with the second voltage dividing module (21).
5. The lightning-proof surge circuit according to claim 4, wherein the second voltage dividing module (21) comprises a plurality of resistors and a capacitor, the second comparing module (22) comprises a second voltage comparator and a third voltage comparator, the plurality of resistors and the capacitor are electrically connected to the input ends of the second voltage comparator and the third voltage comparator, and the output end of the voltage detecting unit (1) is electrically connected to the plurality of resistors and the capacitor.
6. The lightning-resistant surge circuit according to claim 3, wherein the first voltage dividing module (11) comprises a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4, the positive input end of the first voltage comparator is electrically connected with a reference voltage, and the first resistor R1 is electrically connected between the two; the reverse input end of the first voltage comparator is electrically connected with the lightning surge sampling point, the second resistor R2 is electrically connected between the first voltage comparator and the lightning surge sampling point, one end of the third resistor R3 is electrically connected with a node between the first voltage comparator and the first resistor R1, one end of the fourth resistor R4 is electrically connected with a node between the first voltage comparator and the second resistor R2, the other end of the third resistor R3 is electrically connected with the other end of the fourth resistor R4 and is commonly grounded, and the output end of the first voltage comparator is electrically connected with the control unit.
7. The lightning-resistant surge circuit according to claim 5, wherein the second voltage dividing module (21) comprises a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and a capacitor C1, wherein the output end of the first voltage comparator is respectively connected to the fifth resistor R5 and the capacitor C1, a node between the fifth resistor R5 and the capacitor C1 is electrically connected to the positive input ends of the second voltage comparator and the third voltage comparator, the other end of the fifth resistor R5 and one end of the sixth resistor R6 are commonly connected to a reference voltage, the other end of the sixth resistor R6 and one end of the seventh resistor R7 are electrically connected, and midpoints of the two connections are respectively connected to the reverse input ends of the second voltage comparator and the third voltage comparator, and the other end of the seventh resistor R7 and the other end of the capacitor C1 are electrically connected to a common ground.
8. The lightning protection surge circuit of claim 5 wherein the first voltage comparator, the second voltage comparator, and the third voltage comparator are all LM393.
9. The lightning protection surge circuit of claim 1 wherein the reference voltage is +5v in magnitude.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321747955.4U CN220342037U (en) | 2023-07-04 | 2023-07-04 | Lightning-stroke-resistant surge circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321747955.4U CN220342037U (en) | 2023-07-04 | 2023-07-04 | Lightning-stroke-resistant surge circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220342037U true CN220342037U (en) | 2024-01-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321747955.4U Active CN220342037U (en) | 2023-07-04 | 2023-07-04 | Lightning-stroke-resistant surge circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220342037U (en) |
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2023
- 2023-07-04 CN CN202321747955.4U patent/CN220342037U/en active Active
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