CN212588082U9 - Power supply circuit applying overvoltage protector - Google Patents
Power supply circuit applying overvoltage protector Download PDFInfo
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- CN212588082U9 CN212588082U9 CN202021266132.6U CN202021266132U CN212588082U9 CN 212588082 U9 CN212588082 U9 CN 212588082U9 CN 202021266132 U CN202021266132 U CN 202021266132U CN 212588082 U9 CN212588082 U9 CN 212588082U9
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Abstract
The utility model relates to an electrician, electron device of low pressure distribution electric wire netting and DC power supply overvoltage accident protection, specifically speaking are an applied overvoltage protector's supply circuit. Most of the existing electric protection devices only carry out overcurrent protection on a line, and few overvoltage protection devices have the defect of parameter reduction after multiple breakover because of being limited by used components. The technical scheme of the utility model comprises a bidirectional thyristor and a bidirectional transient voltage suppression diode, wherein one end of the bidirectional transient voltage suppression diode is connected with the control level of the bidirectional thyristor, and the other end is connected with the second anode of the bidirectional thyristor; two anodes of the bidirectional controllable silicon are two pins of the protector respectively. The utility model has the advantages that: the temperature characteristic and various electrical performance indexes are stable, the size is small, and the bidirectional transient voltage suppression diode has the characteristics of small leakage current, quick response time, small influence of environmental temperature and stable various indexes in continuous use, so that the technical performance and indexes of the overvoltage protector are improved.
Description
Technical Field
The utility model relates to an electrician, electron device, the overvoltage protection of overvoltage electric power accident of low voltage distribution electric wire netting and DC power supply specifically speaking are overvoltage protector. The overvoltage protection circuit is suitable for overvoltage accident protection of low-voltage distribution power networks (AC220V and AC380V) and direct-current power supplies.
Background
In order to ensure the safe use and operation of electric equipment, a circuit breaker and a fuse are usually installed in a distribution line to protect against overload and short-circuit accidents, and a power supply line is cut off when the circuit has overload and short-circuit accidents, so that the electric equipment is protected and the fire accidents are prevented. Most of the common electric protection devices in the current market are overcurrent and short-circuit protection devices, and have no protection effect on overvoltage accidents of a power supply line; the composite overvoltage protector disclosed in the Chinese patent ZL 93206520.1 and the overvoltage control module disclosed in the ZL 200410039063.4 realize the overvoltage accident protection of the power grid, but due to the limitation of materials and production processes of the piezoresistor, the following defects exist: the voltage dependent resistor is connected with the overvoltage control module through the voltage dependent resistor, and the overvoltage control module is connected with the overvoltage protector through the voltage dependent resistor.
Disclosure of Invention
The utility model aims at providing an overvoltage protector adopts the overvoltage accident protector that can continuous use, and the quality stable performance that bidirectional thyristor TRIAC and two-way transient voltage suppression diode TVS constitute.
The technical scheme of the utility model is that: the bidirectional transient voltage suppressor comprises a bidirectional thyristor and a bidirectional transient voltage suppressor diode, wherein one end of the bidirectional transient voltage suppressor diode is connected with a control stage G of the bidirectional thyristor, and the other end of the bidirectional transient voltage suppressor diode is connected with a second anode T2 of the bidirectional thyristor; the first anode T1 and the second anode T2 of the triac are pin 1 and pin 2 of the overvoltage protector, respectively.
Furthermore, pins of the bidirectional thyristor and the bidirectional transient voltage suppression diode are correspondingly welded, and then the outside of the bidirectional thyristor and the bidirectional transient voltage suppression diode is packaged by adopting an insulating material.
The utility model has the advantages that: the temperature characteristic and various electrical performance indexes are stable, the size is small, the circuit breaker or the fuse is matched for use, and the circuit breaker or the fuse is used for overvoltage accident protection of low-voltage distribution power grids (AC220V and AC380V) and direct-current power supplies and has universal practicability. When the power supply voltage of the power grid is normal, the bidirectional transient voltage suppressor diode and the bidirectional thyristor are in a cut-off state, and the power grid or the direct-current power supply normally supplies power to the electric equipment; when the voltage of a power grid or a direct current power supply rises and exceeds a rated value, a bidirectional transient voltage suppression diode is conducted to trigger a bidirectional thyristor control level, the bidirectional thyristor is conducted, firstly, a tripping coil of a circuit breaker is driven to work to trip the circuit breaker, and an accident power supply is cut off; or the bidirectional thyristor is conducted to form a short circuit between the L line and the N line, and the fuse fuses to cut off the power supply, thereby realizing the purpose of protecting the electric equipment. The bidirectional transient voltage suppressor has the characteristics of small leakage current, strong reverse surge tolerance capability, quick response time, small influence of environmental temperature, good reverse clamping suppression characteristic, strong adaptability and stable continuous use of various index parameters, and compared with the prior art, the technical performance and index of the overvoltage protector are improved.
The technical solution of the present invention will be described in detail with reference to the accompanying drawings and the detailed description.
Drawings
FIG. 1 is a structural diagram of embodiment 1 of the present invention;
fig. 2 is a working principle diagram of embodiment 1 of the present invention;
fig. 3 is a working principle diagram of embodiment 2 of the present invention;
fig. 4 is a working principle diagram of embodiment 3 of the present invention;
fig. 5 is a working principle diagram of embodiment 4 of the present invention.
Detailed Description
Example 1
As shown in fig. 1, the technical solution of the present invention includes a bidirectional thyristor V and a bidirectional transient voltage suppression diode TVS, one end of the bidirectional transient voltage suppression diode TVS is connected to the control stage G of the bidirectional thyristor V, and the other end is connected to the second anode T2 of the bidirectional thyristor V; the first anode T1 of the triac V is pin 1 of the overvoltage protector, and the second anode T2 is pin 2 of the overvoltage protector.
And pins of the bidirectional thyristor V and the bidirectional transient voltage suppression diode TVS are correspondingly welded and then are externally packaged by an insulating material.
The working principle and the working process of the protector are explained by the following specific examples, fig. 2 is a working principle diagram of the overvoltage protector for a single-phase alternating current circuit (AC220V), and a bidirectional transient voltage suppression diode TVS with a proper voltage withstanding value is selected according to requirements to control the turn-off and turn-on of a bidirectional thyristor. A pin 1 of the overvoltage protector is connected with one end of a tripping coil YA, and the other end of the tripping coil YA is connected with an N wire of a power supply circuit; and a pin 2 of the overvoltage protector is connected with a power supply line L line.
When the voltage of the L line to the N line of the power supply line is lower than the breakdown voltage value of the bidirectional transient voltage suppression diode TVS, the bidirectional transient voltage suppression diode TVS is not conducted, the bidirectional thyristor V is cut off, the tripping coil YA does not work, the circuit breaker SA is in a closing state, and the line normally supplies power;
when the voltage of the power supply line exceeds the breakdown voltage value of the bidirectional transient voltage suppression diode TVS, the bidirectional transient voltage suppression diode TVS is conducted, the trigger current passes through the control stage G of the bidirectional thyristor V, the bidirectional thyristor is conducted, the L line, the bidirectional thyristor V, the tripping coil YA and the N line form a loop, the tripping coil YA is attracted, the circuit breaker SA is controlled to trip, the power supply line is disconnected, and overvoltage protection is achieved.
Example 2
As can be seen from fig. 3, in the present embodiment, the overvoltage protection device is used for overvoltage protection of a three-phase four-wire (AC380V) power supply line for low-voltage power distribution, and the pin 2 of the overvoltage protection device is connected to L1, L2, and L3 of the power supply line through three diodes VD1, VD2, and VD3, respectively, in the following connection manner:
the cathodes of the three diodes VD1, VD2 and VD3 are connected with the pin 2 of the overvoltage protector, the anode of the diode VD1 is connected with the end L1 of the power supply line, the anode of the diode VD2 is connected with the end L2 of the power supply line, and the anode of the diode VD3 is connected with the end L3 of the power supply line; the pin 1 of the overvoltage protector is connected with one end of the tripping coil YA, and the other end of the tripping coil YA is connected with the N end of the power supply circuit.
When the voltage of L1, L2 and L3 ends of a power supply line to the N end is lower than the breakdown voltage value of the bidirectional transient voltage suppression diode TVS, the bidirectional transient voltage suppression diode TVS is not conducted, the bidirectional thyristor V is cut off, no current passes through the tripping coil YA, the circuit breaker SA is in a closing state, and the line normally supplies power to electric equipment.
When the voltage of any phase L line to the N line in the circuit exceeds the breakdown voltage value of the bidirectional transient voltage suppression diode TVS, the bidirectional transient voltage suppression diode TVS is conducted, the control stage G of the bidirectional thyristor V has trigger current to pass through, the bidirectional thyristor is conducted, the tripping coil YA works, the circuit breaker SA trips, the overvoltage accident power supply is cut off, and overvoltage protection is realized.
Example 3
As can be seen from fig. 4, in this embodiment, the overvoltage protector cooperates with the fuse to realize line protection, the fuse FU is connected in series in the L line of the power supply line, the overvoltage protector is connected in parallel at two ends of the power load, that is, the pin 2 of the overvoltage protector is connected to the L line of the power supply line, and the pin 1 is connected to the N line of the power supply line.
When the circuit works, when the voltage of the L line to the N line of the power supply circuit is lower than the breakdown voltage value of the bidirectional transient voltage suppression diode TVS, the circuit normally supplies power; when the voltage of the power supply line exceeds the breakdown voltage value of the bidirectional transient voltage suppression diode TVS, the bidirectional transient voltage suppression diode TVS is conducted, the bidirectional thyristor is conducted, a short circuit is formed, the fuse FU is fused, and the electric equipment is protected.
Example 4
As can be seen from fig. 5, in this embodiment, the overvoltage protector cooperates with the fuse to realize overvoltage protection of the dc power supply, the fuse FU is connected in series in the positive line of the dc power supply line, the overvoltage protector is connected in parallel at two ends of the power load, that is, the pin 2 of the overvoltage protector is connected to the positive electrode of the dc power supply line, and the pin 1 is connected to the negative electrode of the dc power supply line.
When the direct current power supply works, when the voltage of the direct current power supply is lower than the breakdown voltage value of the bidirectional transient voltage suppression diode TVS, the power supply normally supplies power; when the power voltage exceeds the breakdown voltage value of the bidirectional transient voltage suppression diode TVS, the bidirectional transient voltage suppression diode TVS is conducted, the bidirectional thyristor is conducted to form a short circuit, the fuse FU is fused, the accident power supply is cut off, and the electric equipment is protected.
Claims (2)
1. A power supply circuit using an overvoltage protector, characterized in that: the overvoltage protector comprises a bidirectional thyristor (V) and a bidirectional transient voltage suppression diode (TVS), one end of the bidirectional transient voltage suppression diode (TVS) is connected with a control stage (G) of the bidirectional thyristor (V), and the other end of the bidirectional transient voltage suppression diode (TVS) is connected with a second anode (T2) of the bidirectional thyristor (V); a first anode (T1) and a second anode (T2) of the bidirectional triode thyristor (V) are a pin 1 and a pin 2 of the overvoltage protector respectively;
the power supply circuit includes any one of: three-phase four-wire power supply lines, single-phase alternating current power supply lines or direct current power supply lines;
in a three-phase four-wire power supply line, the power supply circuit further includes: three diodes (VD1, VD2, VD3) and a circuit breaker (SA) with at least three switches and its trip coil (YA); the anodes of the three diodes (VD1, VD2 and VD3) are respectively connected with the three phase lines of the power supply circuit, and the cathodes of the three diodes (VD1, VD2 and VD3) are all connected with a pin 2 of the overvoltage protector; and the three switches of the circuit breaker (SA) are respectively connected in series to the three phase lines of the power supply circuit; one end of the tripping coil (YA) is connected with the N line of the power supply circuit, and the other end of the tripping coil (YA) is connected with a pin 1 of the overvoltage protector;
in a single-phase ac power supply line, the power supply circuit further comprises: a circuit breaker (SA) with at least one switch and its trip coil (YA), or Fuse (FU); correspondingly, one switch of the circuit breaker (SA) is connected in series to the L line of the supply circuit; one end of the tripping coil (YA) is connected with the N line of the power supply circuit, and the other end of the tripping coil (YA) is connected with a pin 1 of the overvoltage protector; or, the Fuse (FU) is connected in series with the L line of the power supply circuit, the pin 2 of the overvoltage protector is connected with the L line, and the pin 1 is connected with the N line;
in a direct current power supply line, the power supply circuit further includes: fuse (FU), Fuse (FU) series connection in supply circuit's anodal circuit, overvoltage protector's pin 2 is connected anodal, and the negative pole is connected to pin 1.
2. The power supply circuit using the overvoltage protector as claimed in claim 1, wherein: and pins of the bidirectional thyristor (V) and the bidirectional transient voltage suppression diode (TVS) are correspondingly welded, and then are packaged by adopting an insulating material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021266132.6U CN212588082U9 (en) | 2020-07-02 | 2020-07-02 | Power supply circuit applying overvoltage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021266132.6U CN212588082U9 (en) | 2020-07-02 | 2020-07-02 | Power supply circuit applying overvoltage protector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN212588082U CN212588082U (en) | 2021-02-23 |
| CN212588082U9 true CN212588082U9 (en) | 2021-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021266132.6U Active CN212588082U9 (en) | 2020-07-02 | 2020-07-02 | Power supply circuit applying overvoltage protector |
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| Country | Link |
|---|---|
| CN (1) | CN212588082U9 (en) |
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- 2020-07-02 CN CN202021266132.6U patent/CN212588082U9/en active Active
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| CN212588082U (en) | 2021-02-23 |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CU01 | Correction of utility model | ||
| CU01 | Correction of utility model |
Correction item: Abstract figure Correct: Correct False: error Number: 09-01 Volume: 37 Correction item: Abstract figure|Claims|Description|Drawings Correct: Correct False: error Number: 09-01 Page: ?? Volume: 37 |