CN210724193U - High-reliability easy-tripping parallel piezoresistor assembly - Google Patents
High-reliability easy-tripping parallel piezoresistor assembly Download PDFInfo
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- CN210724193U CN210724193U CN201921922267.0U CN201921922267U CN210724193U CN 210724193 U CN210724193 U CN 210724193U CN 201921922267 U CN201921922267 U CN 201921922267U CN 210724193 U CN210724193 U CN 210724193U
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Abstract
A high-reliability easy-tripping parallel piezoresistor component comprises a first piezoresistor, at least one second piezoresistor and an overcurrent and overheat circuit breaking mechanism, wherein the piezoresistor of the first piezoresistor has the lowest voltage value; the first terminal pin of the first piezoresistor and the first terminal pin of each second piezoresistor are connected with a first connection wire of the circuit; the second terminal pins of the first piezoresistors and the second terminal pins of each second piezoresistor are connected with the second wiring of the circuit, and the end faces where the first terminal pins of the first piezoresistors are located are connected with the first wiring of the circuit through the overcurrent and overheat circuit breaking mechanism. The first piezoresistor with the lowest voltage-dependent voltage value is set as a key device for tripping, and the end face of the first piezoresistor is not provided with a pit, so that the integrity of the piezoresistor is kept, the first piezoresistor can be tripped smoothly, the breakdown is avoided, welding points are easier to trip, and the reliability and the safety are higher; under the condition of large-current surge, the current is shared by all the piezoresistors, so that the safety is improved.
Description
Technical Field
The utility model relates to an overvoltage protection electron technical field especially relates to a parallelly connected piezo-resistor subassembly of high reliable easy dropout.
Background
For various reasons, power systems often have overvoltage, which generally includes overvoltage caused by lightning, operation overvoltage caused by turning on and off capacitive load, overvoltage caused by other grid faults, and the like, and the overvoltage can cause damage to electric equipment.
In the overvoltage protection, a surge protector (SPD, i.e. a low voltage lightning protector) is generally connected in parallel in an electric equipment circuit, and the voltage sensitivity characteristic of a varistor (MOV) of a core component of the SPD is utilized to protect the electric equipment from being damaged by various overvoltage. At present, this technique generally uses low-melting material as welding point, and the connecting end of the connecting lead is welded with one end face of the varistor (MOV), and under the condition of overvoltage, when the protection capability is exceeded, the low-melting welding point heats and melts and is pulled to be separated from the end face of the varistor (MOV), so that the circuit is disconnected.
In order to make the solder joint break away from easily, there is a reported practice that an inwardly recessed pit is arranged on the end surface of one of the piezoresistors (MOV), and the connecting end of the connecting lead is soldered in the pit through the solder joint, so that although the resistance of the piezoresistor at the pit is reduced, the current passing through the solder joint is increased, and the solder joint is easy to trip, the structural integrity of the piezoresistor is damaged due to the arrangement of the pit, and the current is concentrated in the small pit with too high density, so that the piezoresistor is easy to break down to cause short circuit, the reliability is poor, and a large potential safety hazard still exists.
Disclosure of Invention
The to-be-solved technical problem of the utility model is to provide a parallelly connected piezo-resistor subassembly of high reliable easy dropout, this kind of high reliable parallelly connected piezo-resistor subassembly of easy dropout makes the solder joint dropout more easily, and is more reliable safer. The technical scheme is as follows:
a high-reliability easy-tripping parallel piezoresistor component is characterized in that: the overcurrent and overheat circuit breaking device comprises a first piezoresistor, at least one second piezoresistor and an overcurrent and overheat circuit breaking mechanism, wherein the voltage-dependent voltage value of each second piezoresistor is greater than that of the first piezoresistor; the first terminal pin of the first piezoresistor and the first terminal pin of each second piezoresistor are connected with a first connection wire of the circuit; the second terminal pins of the first piezoresistors and the second terminal pins of each second piezoresistor are connected with the second wiring of the circuit, and the end faces where the first terminal pins of the first piezoresistors are located are connected with the first wiring of the circuit through the overcurrent and overheat circuit breaking mechanism.
The high-reliability easy-to-trip piezoresistor component is characterized in that each piezoresistor connected in parallel is divided into a first piezoresistor and at least one second piezoresistor, the piezovoltage value of the first piezoresistor is set to be the lowest, the first piezoresistor is used as a key device for tripping, and under the conditions of over-voltage caused by ultra-large lightning stroke overvoltage, power grid fault and the like, the first piezoresistor is easy to heat, so that the overcurrent and overheating circuit breaking mechanism breaks a first connection of a circuit, and the first piezoresistor is prevented from being broken down to cause fire, so that the purposes of tripping and protecting a rear circuit are achieved.
As a preferable embodiment of the present invention, the voltage-dependent voltage value of the second voltage-dependent resistor is 1.01 to 1.25 times the voltage-dependent voltage value of the first voltage-dependent resistor.
As the utility model discloses an optimal scheme, the one end that overflows overheated circuit breaking mechanism is connected on the same position of first lead pin place terminal surface of a piezo-resistor, overflow overheated circuit breaking mechanism's the other end with the first wiring of circuit is connected.
As the utility model discloses an optimal scheme, the first wiring of circuit includes first wiring anterior segment and first wiring back end, first pin of first piezo-resistor, each second piezo-resistor's first pin all are connected with first wiring back end, overflow overheated circuit breaker's one end and connect on the terminal surface at first piezo-resistor's first pin place and stagger each other with the hookup location of first pin, overflow overheated circuit breaker's the other end and connect on first wiring anterior segment.
As the utility model discloses further preferred scheme, overflowing overheated circuit breaking mechanism and including low-melting thing solder joint, dropout wiring and drawing off mechanism, the one end of dropout wiring is passed through low-melting thing solder joint and is welded on the terminal surface at first pin place of first piezo-resistor, the other end of dropout wiring with the first wiring of circuit is connected, draws off the setting of mechanism on taking off the lock joint line.
As a further preferred aspect of the present invention, the pull-off mechanism is a metal elastic member, the trip wiring includes a first section of trip wiring and a second section of trip wiring, and the metal elastic member is connected between the first section of trip wiring and the second section of trip wiring.
As a still further preferable aspect of the present invention, the metal elastic member is a metal spring.
As a further preferred aspect of the present invention, the overcurrent overheat breaking mechanism is an independent and complete electronic device. The above-mentioned independent complete electronic device includes but is not limited to a common fuse, a temperature fuse, and a temperature resistor, which may be one of them, or a combination of two or more of them.
Compared with the prior art, the utility model, have following advantage:
because the first piezoresistor with the lowest piezoresistor voltage value is set as a key device for tripping, the overcurrent and overheat circuit breaking mechanism is directly arranged on the end face of the first piezoresistor, and no pit is arranged on the end face of the first piezoresistor, the integrity of the piezoresistor cannot be damaged, the first piezoresistor can be tripped smoothly, and the piezoresistors can be prevented from being punctured and ignited, therefore, the high-reliability easy-tripping piezoresistor component can trip welding spots more easily, and is more reliable and safer; under the condition of large-current surge, the current is shared by the first piezoresistor and each second piezoresistor, so that the surge protection circuit can bear the impact of larger surge current, the residual voltage of surge impact is lower, the protection level is higher, and the safety and reliability of the whole protected circuit are greatly improved.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention;
FIG. 2 is a modified structure of FIG. 1 in which the varistors are tightly attached together, and the common pins are used for the tight attaching surfaces;
fig. 3 is a schematic structural diagram of a second embodiment of the present invention;
fig. 4 is a modified structure of fig. 3 in which the varistors are closely attached together, and the closely attached surfaces thereof use common pins.
Detailed Description
The following further describes the preferred embodiments of the present invention with reference to the accompanying drawings.
Example one
As shown in fig. 1 and fig. 2, the high-reliability easy-to-trip parallel varistor assembly includes a first varistor 1, two second varistors 2 (one or more) and an overcurrent and overheat breaking mechanism 3, where the overcurrent and overheat breaking mechanism 3 includes a low-melt solder joint 301, a first trip wire section 302, a second trip wire section 303 and a metal spring 304, and the metal spring 304 is connected between the first trip wire section 302 and the second trip wire section 303; the voltage-dependent voltage value of each second voltage-dependent resistor 2 is greater than that of the first voltage-dependent resistor 1; the first pin 4 of the first piezoresistor 1 and the first pin 5 of each second piezoresistor 2 are connected with a first connection wire (L) of the circuit; the second pin 6 of the first piezoresistor 1 and the second pin 7 of each second piezoresistor 2 are connected with a second connection wire (N) of the circuit; the end part of the first section 302 of the trip connection is welded on the same position of the end surface of the first pin 4 of the first piezoresistor 1 through a low-melting-point object welding spot 301, and the end part of the second section 302 of the trip connection is connected with the first connection (L) of the circuit.
The voltage-sensitive value of the second voltage-sensitive resistor 2 is 1.01-1.25 times that of the first voltage-sensitive resistor 1.
The circuit refers to an external application circuit.
The low-melting-point solder 301 is generally made of tin or the like.
According to the high-reliability easy-tripping piezoresistor assembly, each piezoresistor connected in parallel is divided into a first piezoresistor 1 and two second piezoresistors 2, the piezovoltage value of the first piezoresistor 1 is set to be the lowest, the first piezoresistor 1 is used as a key device for tripping, under the conditions of overvoltage caused by lightning, power grid fault overvoltage and the like, a low-melt welding spot 301 on the first piezoresistor 1 with the lowest piezovoltage value is melted through large current, and a first section 302 of a tripping wiring is separated from the end face of the first piezoresistor 1 under the action of the tensile force of a metal spring 304, so that the purposes of tripping and protecting a rear circuit are achieved. Because the first piezoresistor 1 with the lowest voltage-sensitive value is set as a key device for tripping, the first section 302 of the tripping connection wire is directly welded on the end surface of the first piezoresistor 1, and no pit is arranged on the end surface of the first piezoresistor 1, the integrity of the piezoresistor cannot be damaged, the phenomenon that the current is concentrated in a small pit to cause overlarge current density is avoided, the first piezoresistor 1 can be tripped smoothly, and the phenomenon that each piezoresistor is punctured to cause fire can be avoided, therefore, the high-reliability easy-tripping piezoresistor component can more easily trip a welding spot, and is more reliable and safer; when a large current surge occurs, the current is shared by the first varistor 1 and the second varistor 2, so that the high current surge can be withstood, and the safety is improved.
Example two
As shown in fig. 3 and 4, in the case that the other parts are the same as the first embodiment, the difference is only that: the first connection (L) of the circuit comprises a first connection front section L1 and a first connection rear section L2, the first terminal pin 4 of the first piezoresistor 1 and the first terminal pin 5 of each second piezoresistor 2 are connected with the first connection rear section L2, one end of the overcurrent and overheat breaking mechanism 3 is connected to the end face where the first terminal pin 4 of the first piezoresistor 1 is located and is mutually staggered with the connection position of the first terminal pin 4, and the other end of the overcurrent and overheat breaking mechanism 3 is connected to the first connection front section L1.
In other embodiments, the overcurrent, overheat and shutdown mechanism is a single complete electronic device, including but not limited to a common fuse, a temperature fuse, and a temperature resistor, which may be one of them, or a combination of two or more of them.
In addition, it should be noted that the names of the parts and the like of the embodiments described in the present specification may be different, and all the equivalent or simple changes made according to the structure, the features and the principle of the present invention are included in the protection scope of the present invention. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (8)
1. A high-reliability easy-tripping parallel piezoresistor component is characterized in that: the overcurrent and overheat circuit breaking device comprises a first piezoresistor, at least one second piezoresistor and an overcurrent and overheat circuit breaking mechanism, wherein the voltage-dependent voltage value of each second piezoresistor is greater than that of the first piezoresistor; the first terminal pin of the first piezoresistor and the first terminal pin of each second piezoresistor are connected with a first connection wire of the circuit; the second terminal pins of the first piezoresistors and the second terminal pins of each second piezoresistor are connected with the second wiring of the circuit, and the end faces where the first terminal pins of the first piezoresistors are located are connected with the first wiring of the circuit through the overcurrent and overheat circuit breaking mechanism.
2. The high reliability easy-to-trip shunt resistor assembly of claim 1, wherein: the voltage-sensitive value of the second voltage-sensitive resistor is 1.01-1.25 times that of the first voltage-sensitive resistor.
3. The high reliability easy-to-trip shunt resistor assembly of claim 1, wherein: one end of the overcurrent and overheat circuit breaking mechanism is connected to the same position of the end face where the first lead pin of the first piezoresistor is located, and the other end of the overcurrent and overheat circuit breaking mechanism is connected with a first wiring of the circuit.
4. The high reliability easy-to-trip shunt resistor assembly of claim 1, wherein: the first wiring of circuit includes first wiring anterior segment and first wiring back end, first pin, each second piezo-resistor's of first piezo-resistor first pin all are connected with first wiring back end, the one end of overflowing overheated circuit breaking mechanism is connected on the terminal surface at first piezo-resistor's first pin place and stagger each other with the hookup location of first pin, overflow overheated circuit breaking mechanism's the other end and connect on first wiring anterior segment.
5. The high-reliability easy-to-trip parallel voltage dependent resistor assembly as claimed in claim 3 or 4, wherein: the overcurrent overheating circuit breaking mechanism comprises a low-melting-object welding spot, a tripping wiring and a pulling-out mechanism, one end of the tripping wiring is welded on the end face of the first pin of the first piezoresistor through the low-melting-object welding spot, the other end of the tripping wiring is connected with the first wiring of the circuit, and the pulling-out mechanism is arranged on the tripping connection line.
6. The highly reliable easy-to-trip parallel varistor assembly of claim 5, further comprising: the pull-out mechanism is a metal elastic piece, the tripping connection wire comprises a first section of the tripping connection wire and a second section of the tripping connection wire, and the metal elastic piece is connected between the first section of the tripping connection wire and the second section of the tripping connection wire.
7. The highly reliable easy-to-trip shunt varistor assembly of claim 6, wherein: the metal elastic piece is a metal spring.
8. The high-reliability easy-to-trip parallel voltage dependent resistor assembly as claimed in claim 3 or 4, wherein: the overcurrent, overheat and circuit breaking mechanism is an independent and complete electronic device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921922267.0U CN210724193U (en) | 2019-11-08 | 2019-11-08 | High-reliability easy-tripping parallel piezoresistor assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921922267.0U CN210724193U (en) | 2019-11-08 | 2019-11-08 | High-reliability easy-tripping parallel piezoresistor assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210724193U true CN210724193U (en) | 2020-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921922267.0U Active CN210724193U (en) | 2019-11-08 | 2019-11-08 | High-reliability easy-tripping parallel piezoresistor assembly |
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| Country | Link |
|---|---|
| CN (1) | CN210724193U (en) |
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- 2019-11-08 CN CN201921922267.0U patent/CN210724193U/en active Active
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