CN213093871U - Protection circuit with abnormal continuous overvoltage protection function - Google Patents
Protection circuit with abnormal continuous overvoltage protection function Download PDFInfo
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- CN213093871U CN213093871U CN202021957179.7U CN202021957179U CN213093871U CN 213093871 U CN213093871 U CN 213093871U CN 202021957179 U CN202021957179 U CN 202021957179U CN 213093871 U CN213093871 U CN 213093871U
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Abstract
The utility model discloses a protection circuit with excessive pressure protect function is lasted to anomaly, connect in parallel in power and load both ends respectively including it, this circuit is including the instantaneous overvoltage protection circuit that is arranged in releasing instantaneous surge voltage and be arranged in the circuit that the excessive pressure is lasted to anomaly and the overvoltage protection circuit is lasted to anomaly, instantaneous overvoltage protection circuit is parallelly connected with power and load both ends respectively, and the overvoltage protection circuit is lasted to anomaly is parallelly connected with power and load both ends respectively and is connected with instantaneous overvoltage protection circuit's output. The utility model discloses when can realize carrying out overvoltage protection to the load, still carry out the unusual overvoltage protection that lasts to instantaneous overvoltage protection circuit. Furthermore, the utility model discloses still set up the overcurrent protection circuit, when the electric current that flows through the load exceeded the settlement electric current, the overcurrent protection circuit broken circuit to the protection load. The utility model has the characteristics of safe and reliable, simple structure etc.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to an overvoltage protection technical field especially relates to a protection circuit with unusual overvoltage protection function that lasts.
[ background of the invention ]
The overvoltage protection circuit maintains the voltage value in the circuit in a relatively stable state so as to protect the load in the circuit to a certain extent. The common overvoltage protection device is a transient diode, which is a high-efficiency circuit protection device, has extremely fast response time and very high surge absorption capacity, and when two ends of the transient diode are subjected to instantaneous high-energy impact, the transient diode can change the impedance value of the two ends from high impedance to low impedance in extremely fast time to discharge instantaneous large current, so that the voltages at the two ends of the transient diode are clamped in a protection range to protect a back end circuit from instantaneous high-voltage impact. However, if an abnormal overvoltage with a long duration occurs in the circuit due to the unstable power supply, the transient diode will be aged or even damaged, and the normal overvoltage protection function of the transient diode will be affected.
Therefore, it is an objective requirement to avoid the transient diode from aging and even being damaged due to the abnormal sustained overvoltage.
[ Utility model ] content
The present invention is directed to solve the above problems, and provides a protection circuit having an abnormal continuous overvoltage protection function, which can prevent the transient diode from aging or being damaged due to the abnormal continuous overvoltage.
In order to realize the above-mentioned purpose, the utility model provides a pair of protection circuit with excessive pressure protect function is lasted to abnormity, connect in parallel in power and load both ends respectively including it, this circuit is including the instantaneous overvoltage protection circuit that is arranged in releasing instantaneous surge voltage and be arranged in the circuit that the circuit is unusual to last excessive pressure's the excessive pressure protect circuit that lasts, instantaneous overvoltage protection circuit connects in parallel with power and load both ends respectively, the excessive pressure protect circuit is lasted to abnormity connects in parallel and is connected with instantaneous overvoltage protection circuit's output with power and load both ends are parallelly connected respectively.
The transient overvoltage protection circuit comprises a first voltage limiting device and a second voltage limiting device, one end of the first voltage limiting device is connected with one end of the load, the other end of the first voltage limiting device is connected with one end of the second voltage limiting device and the input end of the abnormal continuous overvoltage protection circuit respectively, and the other end of the second voltage limiting device is connected with the other end of the load.
The first voltage limiting device is a first transient diode TVS1, the second voltage limiting device is a second transient diode TVS2, the anode of the first transient diode TVS1 is connected with one end of a load, the cathode of the first transient diode TVS1 is respectively connected with the cathode of the second transient diode TVS2 and the input end of the abnormal continuous overvoltage protection circuit, and the anode of the second transient diode TVS2 is connected with the other end of the load.
The abnormal continuous overvoltage in the circuit is the abnormal overvoltage which is caused by unstable power supply and has long duration and appears in the circuit.
The abnormal continuous overvoltage protection circuit comprises a bidirectional trigger diode D1 and a bidirectional thyristor TR1, one end of the bidirectional trigger diode D1 is connected with the output end of the instantaneous overvoltage protection circuit, the other end of the bidirectional trigger diode D1 is connected with the G pole of the bidirectional thyristor TR1, and the T1 pole and the T2 pole of the bidirectional thyristor TR1 are respectively connected with two ends of a load.
The circuit includes an overcurrent protection circuit connected in series between the power supply and the load.
The overcurrent protection circuit is one of a thermal relay, a fuse or a contactor.
Further, the fuse is a self-recovery fuse tube.
The utility model has the advantages that: the utility model discloses a set up instantaneous overvoltage crowbar and the unusual combination protection circuit who lasts overvoltage crowbar to provide instantaneous surge protection through instantaneous overvoltage crowbar, provide unusual overvoltage protection through the unusual excessive pressure that lasts that the overvoltage crowbar appears in to the circuit simultaneously. Furthermore, the utility model discloses still set up the overcurrent protection circuit, when the electric current that flows through the load exceeded the settlement electric current, the overcurrent protection circuit broken circuit to the protection load. The utility model has the characteristics of safe and reliable, simple structure etc.
[ description of the drawings ]
Fig. 1 is a schematic block diagram of the present invention.
Fig. 2 is a schematic circuit diagram of the present invention.
[ detailed description ] embodiments
The following examples are further to explain and supplement the present invention, and do not constitute any limitation to the present invention.
As shown in fig. 1, the protection circuit with the abnormal continuous overvoltage protection function of the present invention includes an instantaneous overvoltage protection circuit 10, an abnormal continuous overvoltage protection circuit 20, and an overcurrent protection circuit 30. The circuit is respectively connected with two ends of a power supply and two ends of a load in parallel and used for carrying out overvoltage protection and overcurrent protection on the load, wherein the power supply is an alternating current power supply.
As shown in fig. 1 and fig. 2, two ends of the instantaneous overvoltage protection circuit 10 are respectively connected in parallel with a power supply and a load circuit, and are used for performing instantaneous surge protection on a load. The transient overvoltage protection circuit 10 includes a first voltage limiting device and a second voltage limiting device, wherein one end of the first voltage limiting device is connected to one end of the load, the other end of the first voltage limiting device is connected to one end of the second voltage limiting device and the input end of the abnormal continuous overvoltage protection circuit 20, and the other end of the second voltage limiting device is connected to the other end of the load. The first voltage limiting device in this embodiment is a first transient diode TVS1, and the second voltage limiting device is a second transient diode TVS 2. Specifically, the anode of the first transient diode TVS1 is connected to one end of the load, the cathode thereof is connected to the cathode of the second transient diode TVS2 and the input terminal of the abnormal sustained overvoltage protection circuit 20, respectively, and the anode of the second transient diode TVS2 is connected to the other end of the load.
As shown in fig. 1 and fig. 2, the abnormal sustained overvoltage protection circuit 20 is connected in parallel to the two ends of the power supply and the load, and is connected to the output end of the instantaneous overvoltage protection circuit 10, and is used for relieving the abnormal sustained overvoltage in the circuit, in this embodiment, the abnormal sustained overvoltage in the circuit is an abnormal overvoltage which occurs in the circuit for a long time due to the unstable power supply. Specifically, the abnormal continuous overvoltage protection circuit 20 includes a diac D1 and a triac TR 1. One end of the bidirectional trigger diode D1 is connected to the output end of the instantaneous overvoltage protection circuit 10, the other end of the bidirectional trigger diode D1 is connected to the G pole of the triac T1, and the T1 pole and the T2 pole of the triac TR1 are connected to the two ends of the load, respectively.
As shown in fig. 1 and 2, the overcurrent protection circuit 30 is connected in series between the power supply and the load, and is used for preventing the load from being damaged due to excessive current flowing through the load. The overcurrent protection circuit 30 is a fuse or other overcurrent protection device, such as a thermal relay or a contactor, wherein the fuse is a fuse. The overcurrent protection circuit 30 in this embodiment is a fuse. Specifically, the fuse 30 has one end connected to a power source and the other end connected to a load.
As shown in fig. 2, the working principle of the present invention is: when an instantaneous high voltage appears at two ends of the power supply, the first transient diode TVS1 and the second transient diode TVS2 change from a high-resistance state to a low-resistance state in a very fast time to discharge an instantaneous large surge current, so that the voltage clamping at the two ends of the power supply is lower than the maximum withstand voltage of the load, and the load is protected from being damaged by the instantaneous high voltage. When the power supply is unstable and abnormal continuous overvoltage occurs at two ends of the power supply for a long time, and the abnormal overvoltage exceeds the breakover voltage of the diac D1, the diac D1 is conducted, the triac TR1 is conducted, and the abnormal overvoltage is discharged through the triac TR1, so as to protect the first transient diode TVS1 and the second transient diode TVS2 from aging and even damage due to the influence of the abnormal continuous overvoltage. When the current flowing through the load exceeds the current of the fuse F1, the fuse F1 opens to protect the load from overcurrent.
Although the present invention has been described in connection with the above embodiments, the scope of the present invention is not limited thereto, and modifications, replacements, and the like to the above members are all within the scope of the claims of the present invention without departing from the concept of the present invention.
Claims (7)
1. The protection circuit with the abnormal continuous overvoltage protection function is characterized by comprising an instantaneous overvoltage protection circuit (10) used for discharging instantaneous surge voltage and an abnormal continuous overvoltage protection circuit (20) used for abnormal continuous overvoltage in the discharge circuit, wherein the instantaneous overvoltage protection circuit (10) is connected with the two ends of the power supply and the two ends of the load in parallel, and the abnormal continuous overvoltage protection circuit (20) is connected with the two ends of the power supply and the two ends of the load in parallel and is connected with the output end of the instantaneous overvoltage protection circuit (10).
2. The protection circuit with the abnormal sustained overvoltage protection function according to claim 1, wherein the transient overvoltage protection circuit (10) comprises a first voltage limiting device and a second voltage limiting device, one end of the first voltage limiting device is connected to one end of the load, the other end of the first voltage limiting device is connected to one end of the second voltage limiting device and the input end of the abnormal sustained overvoltage protection circuit (20), respectively, and the other end of the second voltage limiting device is connected to the other end of the load.
3. The protection circuit with esd protection function of claim 2, wherein the first voltage limiting device is a first transient diode TVS1, the second voltage limiting device is a second transient diode TVS2, an anode of the first transient diode TVS1 is connected to one end of the load, a cathode of the first transient diode TVS1 is connected to a cathode of the second transient diode TVS2 and the input of the esd protection circuit (20), and an anode of the second transient diode TVS2 is connected to the other end of the load.
4. The protection circuit with an abnormal sustained overvoltage protection function according to claim 1, wherein the abnormal sustained overvoltage protection circuit (20) includes a diac D1 and a triac TR1, one end of the diac D1 is connected to the output terminal of the instantaneous overvoltage protection circuit (10), the other end thereof is connected to the G pole of the triac TR1, and the T1 pole and the T2 pole of the triac TR1 are connected to both ends of the load, respectively.
5. The protection circuit with the function of protecting against abnormal continuous overvoltage as claimed in claim 1, wherein the protection circuit with the function of protecting against abnormal continuous overvoltage comprises an overcurrent protection circuit (30), and the overcurrent protection circuit (30) is connected in series between a power supply and a load.
6. The protection circuit with abnormal sustained overvoltage protection function according to claim 5, wherein the overcurrent protection circuit (30) is one of a thermal relay, a fuse or a contactor.
7. The protection circuit with an abnormal sustained overvoltage protection function according to claim 6, wherein said fuse is a fuse tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021957179.7U CN213093871U (en) | 2020-09-09 | 2020-09-09 | Protection circuit with abnormal continuous overvoltage protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021957179.7U CN213093871U (en) | 2020-09-09 | 2020-09-09 | Protection circuit with abnormal continuous overvoltage protection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213093871U true CN213093871U (en) | 2021-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021957179.7U Active CN213093871U (en) | 2020-09-09 | 2020-09-09 | Protection circuit with abnormal continuous overvoltage protection function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213093871U (en) |
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2020
- 2020-09-09 CN CN202021957179.7U patent/CN213093871U/en active Active
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