CN210110646U - Protection circuit for preventing transient impulse current of relay - Google Patents
Protection circuit for preventing transient impulse current of relay Download PDFInfo
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- CN210110646U CN210110646U CN201920979430.0U CN201920979430U CN210110646U CN 210110646 U CN210110646 U CN 210110646U CN 201920979430 U CN201920979430 U CN 201920979430U CN 210110646 U CN210110646 U CN 210110646U
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- 238000005265 energy consumption Methods 0.000 abstract description 3
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Abstract
The utility model relates to a prevent relay transient state rush current's protection circuit, it judges and the transient state rush current when the control unit, output electric capacity C4 come the control relay actuation through relay bypass buffer unit, relay actuation voltage, prevents that the relay contact from gluing. And the relay bypass buffer unit does not adopt some energy consumption devices, such as NTC, PTC and the like as current limiting devices, but utilizes the current limiting characteristic of a collector of the triode, so that the current limiting is more reliable, and the influence of overlarge or uncontrollable impact current on rear-end equipment is effectively prevented.
Description
Technical Field
The utility model relates to an electrician's electronic technology field, concretely relates to prevent relay transient state rush current's protection circuit.
Background
In an electrical system, the power supply of some auxiliary equipment is controlled through a relay, so that the aim of saving energy is fulfilled. However, in the process of controlling the relay to be attracted, because the back-end equipment is unknown, the contact of the relay is stuck and fails due to overlarge impact current at the moment of attracting the relay.
In view of the above, the present inventors have made extensive conceptions for problems of the relay output control circuit, and have developed the present invention.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a prevent relay transient state impulse current's protection circuit, it can effectively solve too big transient state impulse current and the relay contact that leads to glues the problem of dying inefficacy.
In order to achieve the above object, the utility model adopts the following technical scheme:
a protection circuit for preventing transient impact current of a relay comprises a relay bypass buffer unit, a relay pull-in voltage judging and controlling circuit and an OUTPUT capacitor C4, wherein one end of the capacitor C4 is connected with an OUTPUT end OUTPUT of the relay, and the other end of the capacitor C4 is grounded;
the relay pull-in voltage judging and controlling unit comprises a relay K1, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a capacitor C2, a PNP triode Q3 and a 431 reference voltage chip U1; one end of the resistor R5 is connected with a power supply VCC, the other end of the resistor R5 is connected with the base electrode of the PNP triode Q3, the emitter electrode of the PNP triode is connected with the power supply VCC, the base electrode is connected with pin 3 of the 431 reference voltage chip U1 through the resistor R6, and the collector electrode is connected with the control end of the relay K1; one end of the resistor R7 is connected with the control end of the relay K1, and the other end is connected with pin 1 of the 431 reference voltage chip U1; the resistor R8 and the capacitor C2 are connected in parallel, one end of the resistor R8 is connected with pin 1 of the 431 reference voltage chip U1, and the other end of the resistor R8 is grounded; pin 2 of the 431 reference voltage chip is grounded, and pin 1 is connected with the OUTPUT terminal OUTPUT of the relay K1 through a resistor R9;
the relay bypass buffer unit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a PNP triode Q1 and an NPN triode Q2, wherein one end of the resistor R1 is connected with a control signal input end CON _ RLY, and the other end of the resistor R1 is connected with a base electrode of the PNP triode Q2; the resistor R2 is connected with the capacitor C1 in parallel, one end of the resistor R2 is connected with the base electrode of the PNP triode Q2, and the other end of the resistor R2 is grounded; the emitter of the PNP triode Q2 is grounded, and the collector is connected with the base of the NPN triode Q1 through a resistor R3; one end of the resistor R4 is connected with the base electrode of the NPN triode Q1, and the other end is connected with the emitting electrode of the NPN triode; and the emitter of the NPN triode Q1 is connected with the INPUT end INPUT of the relay K1, and the collector of the NPN triode Q1 is connected with the OUTPUT end OUTPUT of the relay K1.
The protection circuit further comprises a relay control unit, wherein the relay control unit comprises a resistor R9, a resistor R10, a resistor R11, a resistor R12, a capacitor C3, an NPN triode Q4 and an NPN triode Q5, one end of the resistor R13 is connected with a control signal input end CON _ RLY, the other end of the resistor R13 is connected with a base electrode of the NPN triode Q5, the resistor R12 and the capacitor C3 are connected in parallel, one end of the resistor R12 is connected with the base electrode of the NPN triode Q5, and the other end of the; one end of the resistor R10 is connected with a power supply VCC, the other end of the resistor R10 is connected with the collector of the NPN triode Q5, one end of the resistor R11 is connected with the collector of the NPN triode Q5, and the other end of the resistor R11 is grounded; the collector of the NPN transistor Q4 is connected to the OUTPUT terminal OUTPUT of the relay via the resistor R9, the base is connected to the collector of the NPN transistor Q5, and the emitter is grounded.
After the scheme is adopted, the utility model discloses a transient state impulse current when relay bypass buffer unit, relay actuation voltage are judged and the control unit, output capacitance C4 control the relay actuation prevents that the relay contact from gluing and dying. And the relay bypass buffer unit does not adopt some energy consumption devices, such as NTC, PTC and the like as current limiting devices, but utilizes the current limiting characteristic of a collector of the triode, so that the current limiting is more reliable, and the influence of overlarge or uncontrollable impact current on rear-end equipment is effectively prevented.
Furthermore, the utility model discloses still increased the detection of back end voltage on above-mentioned basis, the transient state impulse current that causes because the too big voltage difference of input and output end when preventing the relay actuation to lead to the relay contact to glue and die the inefficacy. Moreover, the utility model discloses on the break-make of control relay, only used a control signal, control is more simple and convenient reliable, and overall cost is lower.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
As shown in FIG. 1, the utility model discloses a prevent relay transient state rush current's protection circuit, it includes relay bypass buffer unit 1, relay actuation voltage judgement and control circuit 2, OUTPUT electric capacity C4, and the OUTPUT OUTPUT of relay is connected to electric capacity C4 one end, other end ground connection.
The relay bypass buffer unit 1 comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a PNP triode Q1 and an NPN triode Q2, wherein one end of the resistor R1 is connected with a control signal input end CON _ RLY, and the other end of the resistor R1 is connected with a base electrode of the PNP triode Q2; the resistor R2 is connected with the capacitor C1 in parallel, one end of the resistor R2 is connected with the base electrode of the PNP triode Q2, and the other end of the resistor R2 is grounded; the emitter of the PNP triode Q2 is grounded, and the collector is connected with the base of the NPN triode Q1 through a resistor R3; one end of the resistor R4 is connected with the base electrode of the NPN triode Q1, and the other end is connected with the emitting electrode of the NPN triode; and the emitter of the NPN triode Q1 is connected to the INPUT terminal INPUT of the relay, and the collector is connected to the OUTPUT terminal OUTPUT of the relay.
The relay pull-in voltage judging and controlling unit comprises a relay K1, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a capacitor C2, and a PNP triode Q3 and 431 reference voltage chip U1. One end of the resistor R5 is connected with a power supply VCC, the other end of the resistor R5 is connected with the base electrode of the PNP triode Q3, the emitter electrode of the PNP triode is connected with the power supply VCC, the base electrode is connected with pin 3 of the 431 reference voltage chip U1 through the resistor R6, and the collector electrode is connected with the control end of the relay K1; one end of the resistor R7 is connected with the control end of the relay K1, and the other end is connected with pin 1 of the 431 reference voltage chip U1; the resistor R8 and the capacitor C2 are connected in parallel, one end of the resistor R8 is connected with pin 1 of the 431 reference voltage chip U1, and the other end of the resistor R8 is grounded; pin 2 of the 431 reference voltage chip is grounded, and pin 1 is connected to the OUTPUT terminal OUTPUT of the relay K1 through a resistor R9. The parameters of the resistor R9 and the resistor R8 are matched, so that the output voltage of the relay K1 to be absorbed can be set; the resistor R7 is used for setting the return difference of the output voltage when the relay K1 is disconnected, and frequent pull-in and disconnection of the relay K1 caused by control signal fluctuation are prevented; the resistor R9 and the capacitor C2 can control the time delay of pull-in of the relay K1 after the output voltage reaches a set value.
Before the relay K1 is pulled in, a high level is INPUT into a control signal INPUT end CON _ RLY to control a PNP triode Q1 of the relay bypass buffer unit 1 to be conducted, an INPUT end INPUT charges an output capacitor C4 through the PNP triode Q1, according to the current limiting characteristic of a collector of a triode, the maximum charging current of the capacitor C4 is the collector current of a triode Q1, and the impact current of the capacitor C4 can be reliably controlled. When the voltage of the output capacitor C4 reaches a set value, the relay pull-in voltage judgment and control unit controls the conduction of the PNP triode Q3 by conducting pins 2 and 3 of the 431 reference voltage chip U1, so as to achieve the purpose of controlling the pull-in of the relay K1. During attraction, because the voltage difference between the input end and the output end of the relay K1 is small, the transient impact current during attraction of the relay K1 is controlled finally, and the contact of the relay is prevented from being stuck.
The protection circuit for preventing the transient rush current of the relay further comprises a relay control unit 3, wherein the relay control unit 3 comprises a resistor R9, a resistor R10, a resistor R11, a resistor R12, a capacitor C3, an NPN triode Q4 and an NPN triode Q5, one end of the resistor R13 is connected with a control signal input end CON _ RLY, the other end of the resistor R13 is connected with a base electrode of the NPN triode Q5, the resistor R12 is connected with the capacitor C3 in parallel, one end of the resistor R13 is connected with the base electrode of the NPN triode Q5, and the; one end of the resistor R10 is connected with a power supply VCC, the other end of the resistor R10 is connected with the collector of the NPN triode Q5, one end of the resistor R11 is connected with the collector of the NPN triode Q5, and the other end of the resistor R11 is grounded; the collector of the NPN transistor Q4 is connected to the OUTPUT terminal OUTPUT of the relay via the resistor R9, the base is connected to the collector of the NPN transistor Q5, and the emitter is grounded.
The IO port of the MUC or other single switch control signals control the pull-in and the disconnection of the relay by inputting control signals to the control signal input end CON _ RLY.
When a control signal CON _ RLY is at a high level, a resistor R1, a resistor R2, a capacitor C2, an NPN transistor Q2 are turned on, a resistor R2 and a PNP transistor Q2 are turned on, an INPUT terminal INPUT charges an output capacitor C2 through the PNP transistor Q2, and simultaneously, the control signal CON _ RLY is turned on through the resistor R2, the capacitor C2, the NPN transistor Q2, a base of the NPN transistor Q2 is at a low level, the NPN transistor Q2 is not turned on, when the output capacitor C2 is boosted to a set value V2, the voltage V2 is divided through the resistor R9, the capacitor C2 and the resistor R2, when the voltage of the resistor R2 is greater than a reference value 2.5V of an INPUT pin 1 of the reference chip U2, a pin 2, 3 of the reference chip U2 is turned on, a reference pin 2, a ground pin of the resistor R2, the resistor C2, the transistor Q2 is turned on, a ground pin is connected, a ground pin of the ground terminal, and a ground terminal VCC coil, and a ground terminal is connected to ground terminal V, when a ground terminal of the transistor C2, the transistor C2 is connected to ground terminal V, the ground terminal of the transistor C2, the ground terminal is connected to ground terminal V2, the ground terminal of the transistor C2, the transistor V2, the ground terminal of.
The utility model discloses a key lies in, the utility model discloses a relay bypass buffer unit 1, relay actuation voltage judge and the transient state impulse current when the control unit, output capacitance C4 control the relay actuation, prevent that the relay contact from gluing and dying. And in addition, the relay bypass buffer unit 1 does not adopt some energy consumption devices, such as NTC, PTC and the like, as current limiting devices, but utilizes the current limiting characteristic of a collector of the triode, so that the current limiting is more reliable, and the influence of overlarge or uncontrollable impact current on rear-end equipment is effectively prevented.
Furthermore, the utility model discloses still increased the detection of back end voltage on above-mentioned basis, the transient state impulse current that causes because the too big voltage difference of input and output end when preventing the relay actuation to lead to the relay contact to glue and die the inefficacy. Moreover, the utility model discloses on the break-make of control relay, only used a control signal, control is more simple and convenient reliable, and overall cost is lower.
The above description is only an embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any slight modifications, equivalent changes and modifications made by the technical spirit of the present invention to the above embodiments are all within the scope of the technical solution of the present invention.
Claims (2)
1. The utility model provides a prevent protection circuit of relay transient state rush current which characterized in that: the relay pull-in voltage detection circuit comprises a relay bypass buffer unit, a relay pull-in voltage judgment and control circuit and an OUTPUT capacitor C4, wherein one end of the capacitor C4 is connected with an OUTPUT end OUTPUT of a relay, and the other end of the capacitor C4 is grounded;
the relay pull-in voltage judging and controlling unit comprises a relay K1, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a capacitor C2, a PNP triode Q3 and a 431 reference voltage chip U1; one end of the resistor R5 is connected with a power supply VCC, the other end of the resistor R5 is connected with the base electrode of the PNP triode Q3, the emitter electrode of the PNP triode is connected with the power supply VCC, the base electrode is connected with pin 3 of the 431 reference voltage chip U1 through the resistor R6, and the collector electrode is connected with the control end of the relay K1; one end of the resistor R7 is connected with the control end of the relay K1, and the other end is connected with pin 1 of the 431 reference voltage chip U1; the resistor R8 and the capacitor C2 are connected in parallel, one end of the resistor R8 is connected with pin 1 of the 431 reference voltage chip U1, and the other end of the resistor R8 is grounded; pin 2 of the 431 reference voltage chip is grounded, and pin 1 is connected with the OUTPUT terminal OUTPUT of the relay K1 through a resistor R9;
the relay bypass buffer unit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a PNP triode Q1 and an NPN triode Q2, wherein one end of the resistor R1 is connected with a control signal input end CON _ RLY, and the other end of the resistor R1 is connected with a base electrode of the PNP triode Q2; the resistor R2 is connected with the capacitor C1 in parallel, one end of the resistor R2 is connected with the base electrode of the PNP triode Q2, and the other end of the resistor R2 is grounded; the emitter of the PNP triode Q2 is grounded, and the collector is connected with the base of the NPN triode Q1 through a resistor R3; one end of the resistor R4 is connected with the base electrode of the NPN triode Q1, and the other end is connected with the emitting electrode of the NPN triode; and the emitter of the NPN triode Q1 is connected with the INPUT end INPUT of the relay K1, and the collector of the NPN triode Q1 is connected with the OUTPUT end OUTPUT of the relay K1.
2. The protection circuit for preventing the transient rush current of the relay according to claim 1, wherein: the protection circuit further comprises a relay control unit, wherein the relay control unit comprises a resistor R9, a resistor R10, a resistor R11, a resistor R12, a capacitor C3, an NPN triode Q4 and an NPN triode Q5, one end of the resistor R13 is connected with a control signal input end CON _ RLY, the other end of the resistor R13 is connected with a base electrode of the NPN triode Q5, the resistor R12 and the capacitor C3 are connected in parallel, one end of the resistor R12 is connected with the base electrode of the NPN triode Q5, and the other end of the; one end of the resistor R10 is connected with a power supply VCC, the other end of the resistor R10 is connected with the collector of the NPN triode Q5, one end of the resistor R11 is connected with the collector of the NPN triode Q5, and the other end of the resistor R11 is grounded; the collector of the NPN transistor Q4 is connected to the OUTPUT terminal OUTPUT of the relay via the resistor R9, the base is connected to the collector of the NPN transistor Q5, and the emitter is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920979430.0U CN210110646U (en) | 2019-06-27 | 2019-06-27 | Protection circuit for preventing transient impulse current of relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920979430.0U CN210110646U (en) | 2019-06-27 | 2019-06-27 | Protection circuit for preventing transient impulse current of relay |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210110646U true CN210110646U (en) | 2020-02-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920979430.0U Withdrawn - After Issue CN210110646U (en) | 2019-06-27 | 2019-06-27 | Protection circuit for preventing transient impulse current of relay |
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| CN (1) | CN210110646U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110265259A (en) * | 2019-06-27 | 2019-09-20 | 厦门拓宝科技有限公司 | A kind of protection circuit of anti-relay great instantaneous current |
-
2019
- 2019-06-27 CN CN201920979430.0U patent/CN210110646U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110265259A (en) * | 2019-06-27 | 2019-09-20 | 厦门拓宝科技有限公司 | A kind of protection circuit of anti-relay great instantaneous current |
| CN110265259B (en) * | 2019-06-27 | 2024-04-09 | 厦门拓宝科技有限公司 | Protection circuit for preventing transient impact current of relay |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20200221 Effective date of abandoning: 20240409 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20200221 Effective date of abandoning: 20240409 |