CN214227895U - Overvoltage-undervoltage and reverse connection prevention multifunctional protection circuit - Google Patents
Overvoltage-undervoltage and reverse connection prevention multifunctional protection circuit Download PDFInfo
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- CN214227895U CN214227895U CN202120031944.0U CN202120031944U CN214227895U CN 214227895 U CN214227895 U CN 214227895U CN 202120031944 U CN202120031944 U CN 202120031944U CN 214227895 U CN214227895 U CN 214227895U
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Abstract
The utility model discloses a cross undervoltage and prevent multi-functional protection circuit of anti-butting, including overvoltage detection circuit, undervoltage detection circuit and electronic switch circuit, electronic switch circuit's control end is connected with overvoltage detection circuit's output and undervoltage detection circuit's output respectively, and electronic switch circuit's output is connected with direct current input's negative pole, and overvoltage detection circuit's input and undervoltage detection circuit input all are connected with direct current input's positive pole. The circuit has the advantages of solving the harm caused by overvoltage, solving the harm caused by undervoltage, solving the problem of reverse connection prevention of the input end and the output end, along with few circuit devices, simple circuit, low cost and high response speed.
Description
Technical Field
The utility model relates to an electronic circuit technical field particularly, relates to a cross undervoltage and prevent multi-functional protection circuit of anti-reverse connection.
Background
In daily life and work, various electrical equipment is needed, the voltage fluctuation of a power supply grid is very large when a large power load incorporated into the power supply grid is started or closed, and the electrical equipment is likely to be damaged when the input voltage is far higher than the voltage of the electrical equipment;
when the voltage of the battery is too low, the electronic equipment continues to use the battery for charging, and the battery is easy to damage in a feeding state; when the positive and negative electrodes of the direct current input end are not in place in reverse connection and are in wrong connection, electric equipment can be damaged.
An effective solution to the problems in the related art has not been proposed yet.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned technical problem among the correlation technique, the utility model provides a cross under-voltage and prevent multi-functional protection circuit of transposition can not only solve the harm that the excessive pressure brought, can also solve the harm that the under-voltage brought, can also solve input output simultaneously and prevent the problem of transposition, and this circuit device is few, the circuit is simple, with low costs, and response speed is fast, can overcome the above-mentioned not enough of prior art.
In order to achieve the technical purpose, the technical scheme of the utility model is realized as follows: the utility model provides a cross undervoltage and prevent multi-functional protection circuit of anti-butting, includes overvoltage detection circuit, undervoltage detection circuit and electronic switch circuit, electronic switch circuit's control end is connected with respectively overvoltage detection circuit's output with undervoltage detection circuit's output, electronic switch circuit's output is connected with direct current input's negative pole, overvoltage detection circuit's input with undervoltage detection circuit input all with direct current input's positive pole is connected.
Further, an input circuit of the overvoltage detection circuit is sequentially connected with a resistor R1, a transient suppression diode V1 and a triode V2; an emitter of the triode V2 is connected with a diode V3, a collector of the triode V2 is connected with a G electrode of an MOS tube Q1 and an MOS tube Q2, and a resistor R4 is connected to the diode V3 in parallel.
Further, an input circuit of the undervoltage detection circuit is sequentially connected with a resistor R2, a transient suppression diode V4, a resistor R3 and a diode V5, and the resistor R3 is connected with a transient suppression diode V6 in parallel; one end of the resistor R3 adjacent to the transient suppression diode V4 is connected with a G pole of a MOS transistor Q1 and a G pole of a MOS transistor Q2.
Further, the input circuit of the electronic switch circuit is connected with the load end of the negative pole of the direct current input through a MOS tube Q2, the output circuit of the electronic switch circuit is connected with the negative pole of the direct current input through a MOS tube Q1, and the MOS tube Q1 is connected with the MOS tube Q2 in series.
Further, the transient suppression diode V1 of the overvoltage detection circuit, and the transient suppression diode V4 and the transient suppression diode V6 of the undervoltage detection circuit may both be voltage regulators.
The utility model has the advantages that: when the input voltage is higher than or lower than the working voltage of the electronic equipment, the electronic equipment does not work, so that the electronic equipment is protected from being damaged, and the power supply equipment is also protected from being damaged; the overvoltage-undervoltage reverse connection preventing circuit needs fewer devices, is very simple in circuit composition, low in economic cost and high in cost performance; the circuit has fast response time, and can meet various direct current input circuits by selecting resistors, transient suppression diodes and MOS tubes with different parameters according to the working conditions of electronic equipment without being limited by input voltage and current.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a block diagram of a overvoltage/undervoltage and reverse-connection prevention multifunctional protection circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a overvoltage/undervoltage and reverse-connection prevention multifunctional protection circuit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of simulation using saber simulation software according to an embodiment of the present invention;
fig. 4 is a schematic diagram of simulation results of fig. 3 according to an embodiment of the present invention.
In the figure: 1. an overvoltage detection circuit; 2. an undervoltage detection circuit; 3. an electronic switching circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art all belong to the protection scope of the present invention.
As shown in fig. 1-2, according to the utility model discloses an cross undervoltage and prevent multi-functional protection circuit of reversal, including overvoltage detection circuit 1, undervoltage detection circuit 2 and electronic switch circuit 3, electronic switch circuit 3's control end is connected with respectively overvoltage detection circuit 1's output with undervoltage detection circuit 2's output, electronic switch circuit 3's output and direct current input's negative pole are connected, overvoltage detection circuit 1's input with undervoltage detection circuit 2 input all with direct current input's positive pole is connected.
In a specific embodiment of the present invention, the input circuit of the overvoltage detection circuit 1 is sequentially connected to a resistor R1, a transient suppression diode V1, and a triode V2; an emitter of the triode V2 is connected with a diode V3, a collector of the triode V2 is connected with a G electrode of an MOS tube Q1 and an MOS tube Q2, and a resistor R4 is connected to the diode V3 in parallel.
When the positive voltage of the direct current input exceeds the reverse voltage of the transient suppression diode V1, the positive voltage current flows through the transient suppression diode V1 through the current-limiting resistor R1, at the moment, the current flows through the base electrode of the triode V2, the triode belongs to a current control type, the triode is in saturated conduction, the grid voltages of the MOS tube Q1 and the MOS tube Q2 are far lower than the minimum value of the gate threshold voltage of the MOS tube Q1 and the gate voltage of the MOS tube Q2, the MOS tube Q1 and the MOS tube Q2 are in a cut-off state, and the negative input end and the load end of the direct current input are not conducted; when the input voltage is not over-voltage, the transient suppression diode V1 is cut off, and the transistor V2 is in a cut-off state.
In a specific embodiment of the present invention, the input circuit of the under-voltage detection circuit 2 is sequentially connected with a resistor R2, a transient suppression diode V4, a resistor R3 and a diode V5, and the resistor R3 is connected in parallel with a transient suppression diode V6; one end of the resistor R3 adjacent to the transient suppression diode V4 is connected with a G pole of a MOS transistor Q1 and a G pole of a MOS transistor Q2.
When the input voltage is a normal value, the transient suppression diode V4 is conducted, after the positive voltage is divided by the resistors R2 and R3, the gate voltages of the MOS transistor Q1 and the MOS transistor Q2 are higher than the gate threshold of the MOS transistor Q2, the sources and the drains of the MOS transistor Q1 and the MOS transistor Q2 are conducted, the direct current input negative input end and the load end are conducted, and the transient suppression diode V6 clamps the gate source voltages of the MOS transistor Q1 and the MOS transistor Q2 within the highest voltage which the transient suppression diode V6 can bear, so that the MOS transistor Q1 and the MOS transistor Q2 are protected; when the input voltage is undervoltage, the transient suppression diode V4 is turned off, the gate voltages of the MOS transistor Q1 and the MOS transistor Q2 are clamped to a low level through the diode V5 and the resistor R3, the MOS transistor Q1 and the MOS transistor Q2 are in a cut-off state, and the dc input negative input terminal and the load terminal are not turned on.
In a specific embodiment of the present invention, the input circuit of the electronic switch circuit 3 is connected to the load end of the dc input negative electrode through the MOS transistor Q2, the output circuit of the electronic switch circuit 3 is connected to the dc input negative electrode through the MOS transistor Q1, the MOS transistor Q1 is connected in series to the MOS transistor Q2.
When the anode of the direct current input end is a cathode and the cathode is an anode, the anode voltage cannot form a loop in the overvoltage detection circuit and the undervoltage detection circuit due to the one-way conductivity of the diodes V3 and V5, the transient suppression diode V4 and the resistor R2 pull the gate voltages of the MOS transistor Q1 and the MOS transistor Q2 to a low voltage level, and the MOS transistor Q1 and the MOS transistor Q2 are in a cut-off state; the transient suppression diode V1 and the resistor R1 pull down the base of the triode V2 to a low voltage level, the triode V2 is also in a cut-off state, at the moment, the direct current input positive input end and the load end are not conducted, and the positive electrode of the input end, the load and the negative electrode cannot form a loop, so that the function of reverse connection prevention is achieved.
In a specific embodiment of the present invention, the transient suppression diode V1 of the overvoltage detection circuit 1 and the transient suppression diode V4 and the transient suppression diode V6 of the undervoltage detection circuit 2 are all voltage-stabilizing tubes.
For the convenience of understanding the above technical solutions of the present invention, the above technical solutions of the present invention are explained in detail through specific use modes below.
According to an cross under-voltage and prevent multi-functional protection circuit of transposition, when this circuit was used in electronic equipment, at first, overvoltage detection circuit 1 and under-voltage detection circuit 2's input was connected to electronic equipment direct current input's positive pole, electronic switch circuit 3 is at electronic equipment direct current input negative pole.
When the direct current input voltage of the electronic equipment is between the undervoltage value and the overvoltage value, the electronic equipment can normally work; when the power supply voltage is higher than the overvoltage value and lower than the undervoltage value or the anode and the cathode of the input end are reversely connected, the circuit can turn off the direct current input cathode, and the anode and the cathode of the electronic equipment can not form a circuit loop.
According to the utility model discloses a cross undervoltage and prevent multi-functional protection circuit of transposition, the following embodiment enumerated.
The requirements are as follows: when the electronic equipment normally works, the direct current input voltage range is 18V-36V, the output voltage is 24V, and the electronic equipment is not damaged when the surge voltage amplitude is 100V, the duration is 500ms, or the input voltage is lower than 18V.
The parameters of the overvoltage-undervoltage reverse-connection-prevention multifunctional protection circuit designed according to the requirements are as follows:
| device bit number | Description of devices | Device value |
| R1 | Resistance (RC) | 20k |
| R2 | Resistance (RC) | 30k |
| R3 | Resistance (RC) | 10k |
| R4 | Resistance (RC) | 100k |
| V1 | Transient suppression diode | P6KE33A |
| V2 | Triode transistor | 2SC945 |
| V3 | Diode with a high-voltage source | LL4148 |
| V4 | Transient suppression diode | P6KE15A |
| V5 | Diode with a high-voltage source | LL4148 |
| V6 | Transient suppression diode | P6KE15A |
| Q1 | N-channel MOS tube | SE150180G |
| Q2 | N-channel MOS tube | SE150180G |
And (3) obtaining a simulation conclusion according to the parameters of the components in the table and the parameters shown in the figures 3-4: when the input voltage is higher than 34.5V or lower than 18V or the input positive and negative electrodes are reversed, the overvoltage-undervoltage and reverse-connection prevention multifunctional protection circuit can quickly respond, the negative electrode input is turned off, and when the input voltage is in the normal working voltage range of the load, the load work is not influenced by the overvoltage-undervoltage reverse-connection prevention circuit.
In the actual circuit simulation, 28V is output when the equipment normally works, the overvoltage surge voltage is 100V, the duration time is 500ms, the obtained overvoltage waveform and the conclusion that an actual circuit is set up according to the parameters in the table, and the voltage waveform of the load end is obtained when the equipment is in overvoltage surge.
When the input provides 28V direct-current voltage, the load can work normally, when the 100V voltage is in overvoltage surge, the circuit is quickly turned off, the load input voltage is zero, and the load is protected; when the voltage returns to the normal value, the load can work normally.
In summary, according to the above technical solution of the present invention, when the input voltage is higher than or lower than the operating voltage of the electronic device, the electronic device does not operate, which protects the electronic device from being damaged and also protects the power supply device from being damaged; the overvoltage-undervoltage reverse connection preventing circuit needs fewer devices, is very simple in circuit composition, low in economic cost and high in cost performance; the circuit has fast response time, and can meet various direct current input circuits by selecting resistors, transient suppression diodes and MOS tubes with different parameters according to the working conditions of electronic equipment without being limited by input voltage and current.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The utility model provides a cross undervoltage and prevent multi-functional protection circuit who connects, its characterized in that, including overvoltage detection circuit (1), undervoltage detection circuit (2) and electronic switch circuit (3), the control end of electronic switch circuit (3) is connected with respectively overvoltage detection circuit (1)'s output with undervoltage detection circuit (2)'s output, electronic switch circuit (3)'s output and direct current input's negative pole are connected, overvoltage detection circuit (1)'s input with undervoltage detection circuit (2) input all with direct current input's positive pole is connected.
2. The multifunctional protection circuit for overvoltage, undervoltage and reverse connection prevention according to claim 1, wherein the input circuit of the overvoltage detection circuit (1) is connected with a resistor R1, a transient suppression diode V1 and a triode V2 in sequence; an emitter of the triode V2 is connected with a diode V3, a collector of the triode V2 is connected with a G electrode of an MOS tube Q1 and an MOS tube Q2, and a resistor R4 is connected to the diode V3 in parallel.
3. The under-voltage and reverse-connection-prevention multifunctional protection circuit as claimed in claim 1, wherein an input circuit of the under-voltage detection circuit (2) is connected with a resistor R2, a transient suppression diode V4, a resistor R3 and a diode V5 in sequence, and the resistor R3 is connected with a transient suppression diode V6 in parallel; one end of the resistor R3 adjacent to the transient suppression diode V4 is connected with a G pole of a MOS transistor Q1 and a G pole of a MOS transistor Q2.
4. An under-voltage and reverse-connection-prevention multifunctional protection circuit as claimed in claim 1, wherein the input circuit of the electronic switch circuit (3) is connected to the load terminal of the negative pole of the dc input through a MOS transistor Q2, the output circuit of the electronic switch circuit (3) is connected to the negative pole of the dc input through a MOS transistor Q1, and the MOS transistor Q1 is connected in series with the MOS transistor Q2.
5. The overvoltage/undervoltage and reverse-connection prevention multifunctional protection circuit according to claim 1, wherein a voltage regulator tube is selected from the transient suppression diode V1 of the overvoltage detection circuit (1) and the transient suppression diode V4 and the transient suppression diode V6 of the undervoltage detection circuit (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120031944.0U CN214227895U (en) | 2021-01-07 | 2021-01-07 | Overvoltage-undervoltage and reverse connection prevention multifunctional protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120031944.0U CN214227895U (en) | 2021-01-07 | 2021-01-07 | Overvoltage-undervoltage and reverse connection prevention multifunctional protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN214227895U true CN214227895U (en) | 2021-09-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120031944.0U Active CN214227895U (en) | 2021-01-07 | 2021-01-07 | Overvoltage-undervoltage and reverse connection prevention multifunctional protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214227895U (en) |
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2021
- 2021-01-07 CN CN202120031944.0U patent/CN214227895U/en active Active
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