CN204407858U - A kind of overvoltage crowbar - Google Patents
A kind of overvoltage crowbar Download PDFInfo
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- CN204407858U CN204407858U CN201520136699.4U CN201520136699U CN204407858U CN 204407858 U CN204407858 U CN 204407858U CN 201520136699 U CN201520136699 U CN 201520136699U CN 204407858 U CN204407858 U CN 204407858U
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- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 5
- 238000001914 filtration Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000012271 agricultural production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005401 electroluminescence Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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Abstract
The utility model discloses a kind of overvoltage crowbar, comprise transformer T1, transformer T2, rectifier bridge Q1, rectifier bridge Q2, three terminal regulator U1 and chip U2.The utility model, by using the electronic components such as cheap chip NE555 timer, effectively controls manufacturing cost, when line voltage is higher than 240V, automatically cuts off the supply line of load RL, prevents power consumption equipment overvoltage and the object damaged to reach.
Description
Technical field
The utility model relates to a kind of protective circuit, specifically a kind of overvoltage crowbar.
Background technology
Along with popularizing of present electric equipment, bring revolutionary change to industrial and agricultural production, Defence business, science and technology, accelerate the development of society, people have stepped into Electrification Age, also make the quality of life of people obtain significantly to improve, also more and more be unable to do without these electric equipments.Along with the development of science and technology, the precision of electric equipment also improves gradually, there occurs earth-shaking change, but how to protect the interference not being subject to the external world of these electric equipments, has become the subject matter that current development in science and technology is paid close attention to.The electrical network of current China is popularized, and huge network system gives us many convenience.But along with the user of access electrical network increases, and the variation of consumer electronics, also result in the instability of line voltage, voltage fluctuated, also become the principal element damaging electric equipment.How to protect power consumption equipment when change in voltage is larger, the direction having become people to study now.The multiplex Single-chip Controlling of prior art, not only control algolithm is complicated, and price is high.
Utility model content
The purpose of this utility model is to provide that a kind of circuit structure is simple, function-stable and the overvoltage crowbar of low cost of manufacture, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the utility model provides following technical scheme:
A kind of overvoltage crowbar, comprise transformer T1, transformer T2, rectifier bridge Q1, rectifier bridge Q2, three terminal regulator U1 and chip U2, described transformer T1 coil L1 one end connects 220V alternating current and load RL respectively, the transformer T1 coil L1 other end connects the 220V alternating current other end respectively, relay K contact switch K-1 and electric capacity C3, the relay K contact switch K-1 other end connects the electric capacity C3 other end and transformer T2 coil L3 respectively, the transformer T2 coil L3 other end connects the load RL other end, described transformer T1 coil L2 one end connects rectifier bridge Q1 pin 1 respectively, electric capacity C1, rectifier bridge Q1 pin 2, three terminal regulator U1 pin 1, resistance R1, relay K coil, diode D3 negative pole and resistance R2, the transformer T1 coil L2 other end connects rectifier bridge Q1 pin 3, rectifier bridge Q1 pin 4 connects the electric capacity C1 other end respectively, three terminal regulator U1 pin 2 and electric capacity C2 ground connection, the electric capacity C2 other end connects three terminal regulator U1 pin 3 respectively, chip U2 pin 4, chip U2 pin 8 and triode VT3 emitter, chip U2 pin 3 is contact resistance R3 and resistance R4 respectively, the resistance R4 other end connects diode D4 positive pole, diode D4 negative pole connecting triode VT3 base stage, triode VT3 collector electrode connects buzzer B, described resistance R3 other end connecting triode VT2 base stage, triode VT2 collector electrode connecting triode VT1 base stage, triode VT1 collector electrode is connecting luminous diode D1 negative pole respectively, the relay K coil other end and diode D3 positive pole, the light-emitting diode D1 positive pole contact resistance R1 other end, described triode VT1 emitter is connecting triode VT2 emitter respectively, light-emitting diode D2 negative pole, the buzzer B other end, chip U2 pin 1, potentiometer RP, electric capacity C4 and rectifier bridge Q2 pin 4 also ground connection, the light-emitting diode D2 positive pole contact resistance R2 other end, described rectifier bridge Q2 pin 1 and pin 3 connection transformer T2 coil L4 two ends respectively, rectifier bridge Q2 pin 2 is contact resistance R5 and the electric capacity C4 other end respectively, the resistance R5 other end connects the potentiometer RP other end, potentiometer RP slide plate connects chip U2 pin 2 and chip U2 pin 6 respectively.
As further program of the utility model: described three terminal regulator U1 model is 7805.
As the utility model further scheme: described chip U2 model is NE555.
Compared with prior art, the beneficial effects of the utility model are: the utility model is by using the electronic components such as cheap chip NE555 timer, effectively control manufacturing cost, when line voltage is higher than 240V, the supply line of automatic cut-out load RL, prevents power consumption equipment overvoltage and the object damaged to reach.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of overvoltage crowbar.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, in the utility model embodiment, a kind of overvoltage crowbar, comprise transformer T1, transformer T2, rectifier bridge Q1, rectifier bridge Q2, three terminal regulator U1 and chip U2, transformer T1 coil L1 one end connects 220V alternating current and load RL respectively, the transformer T1 coil L1 other end connects the 220V alternating current other end respectively, relay K contact switch K 1 and electric capacity C3, the relay K contact switch K-1 other end connects the electric capacity C3 other end and transformer T2 coil L3 respectively, the transformer T2 coil L3 other end connects the load RL other end, transformer T1 coil L2 one end connects rectifier bridge Q1 pin 1 respectively, electric capacity C1, rectifier bridge Q1 pin 2, three terminal regulator U1 pin 1, resistance R1, relay K coil, diode D3 negative pole and resistance R2, the transformer T1 coil L2 other end connects rectifier bridge Q1 pin 3, rectifier bridge Q1 pin 4 connects the electric capacity C1 other end respectively, three terminal regulator U1 pin 2 and electric capacity C2 ground connection, the electric capacity C2 other end connects three terminal regulator U1 pin 3 respectively, chip U2 pin 4, chip U2 pin 8 and triode VT3 emitter, chip U2 pin 3 is contact resistance R3 and resistance R4 respectively, the resistance R4 other end connects diode D4 positive pole, diode D4 negative pole connecting triode VT3 base stage, triode VT3 collector electrode connects buzzer B, resistance R3 other end connecting triode VT2 base stage, triode VT2 collector electrode connecting triode VT1 base stage, triode VT1 collector electrode is connecting luminous diode D1 negative pole respectively, the relay K coil other end and diode D3 positive pole, the light-emitting diode D1 positive pole contact resistance R1 other end, triode VT1 emitter is connecting triode VT2 emitter respectively, light-emitting diode D2 negative pole, the buzzer B other end, chip U2 pin 1, potentiometer RP, electric capacity C4 and rectifier bridge Q2 pin 4 also ground connection, the light-emitting diode D2 positive pole contact resistance R2 other end, rectifier bridge Q2 pin 1 and pin 3 connection transformer T2 coil L4 two ends respectively, rectifier bridge Q2 pin 2 is contact resistance R5 and the electric capacity C4 other end respectively, the resistance R5 other end connects the potentiometer RP other end, potentiometer RP slide plate connects chip U2 pin 2 and chip U2 pin 6 respectively.
Three terminal regulator U1 model is 7805.
Chip U2 model is NE555.
Operation principle of the present utility model is: civil power is through T1 step-down, rectifier bridge Q1 rectification and electric capacity C1 filtering, for circuit provides 12V DC supply, for chip U2 and buzzer B provides 6V operating voltage (VCC) after three terminal regulator U1 voltage stabilizing, during normal electricity consumption, relay K is in release condition, do not consume consuming electric power, relay contact K-1 is in closure state, load RL obtains electric work, transformer T2 is used for the identification of load RL power, when load RL obtains electric work, electric current flows through transformer T2 coil L3 and produces induced electromotive force at L4 end, through rectifier bridge Q2 full-wave rectification, electric capacity C4 filtering, resistance R5 and potentiometer RP dividing potential drop, coupling is to the pin 2 of chip U2 and pin 6, chip U2 is linked to be monostable mode, as voltage comparator, when the pin 2 of chip U2 and pin 6 voltage are lower than 1/3VCC, chip U2 pin 3 exports high level, make triode VT2 saturated through resistance R3, VT1 ends, relay K is in release condition, circuit maintains normal power supply, because the pin 3 of chip U2 is high level, diode D4 is not enough to conducting, triode VT3 ends, buzzer B not sounding.
When exceeding power limitation with electric loading RL, in transformer T2 coil L3, electric current increases, L4 both end voltage raises, through rectifier bridge Q2 rectification, electric capacity C4 two ends direct voltage raises immediately, the pin 2 of chip U2 and pin 6 input voltage > 2/3VCC, its state is reversed, chip U2 pin 3 output low level, VT2 ends, VT1 saturation conduction, relay K obtains electric adhesive, cut off load supplying loop, now light-emitting diode D1 obtains electroluminescence, diode D4 punctures conducting, triode VT3 is saturated, buzzer B obtains electric sounding, realize sound and light alarm, light-emitting diode D2 is power supply instruction, electric capacity C3 is relay contact protection electric capacity, spark damage contact when can prevent K from disconnecting.
The utility model, by using the electronic components such as cheap chip NE555 timer, effectively controls manufacturing cost, when line voltage is higher than 240V, automatically cuts off the supply line of load RL, prevents power consumption equipment overvoltage and the object damaged to reach.
Claims (3)
1. an overvoltage crowbar, comprise transformer T1, transformer T2, rectifier bridge Q1, rectifier bridge Q2, three terminal regulator U1 and chip U2, it is characterized in that, described transformer T1 coil L1 one end connects 220V alternating current and load RL respectively, the transformer T1 coil L1 other end connects the 220V alternating current other end respectively, relay K contact switch K-1 and electric capacity C3, the relay K contact switch K-1 other end connects the electric capacity C3 other end and transformer T2 coil L3 respectively, the transformer T2 coil L3 other end connects the load RL other end, described transformer T1 coil L2 one end connects rectifier bridge Q1 pin 1 respectively, electric capacity C1, rectifier bridge Q1 pin 2, three terminal regulator U1 pin 1, resistance R1, relay K coil, diode D3 negative pole and resistance R2, the transformer T1 coil L2 other end connects rectifier bridge Q1 pin 3, rectifier bridge Q1 pin 4 connects the electric capacity C1 other end respectively, three terminal regulator U1 pin 2 and electric capacity C2 ground connection, the electric capacity C2 other end connects three terminal regulator U1 pin 3 respectively, chip U2 pin 4, chip U2 pin 8 and triode VT3 emitter, chip U2 pin 3 is contact resistance R3 and resistance R4 respectively, the resistance R4 other end connects diode D4 positive pole, diode D4 negative pole connecting triode VT3 base stage, triode VT3 collector electrode connects buzzer B, described resistance R3 other end connecting triode VT2 base stage, triode VT2 collector electrode connecting triode VT1 base stage, triode VT1 collector electrode is connecting luminous diode D1 negative pole respectively, the relay K coil other end and diode D3 positive pole, the light-emitting diode D1 positive pole contact resistance R1 other end, described triode VT1 emitter is connecting triode VT2 emitter respectively, light-emitting diode D2 negative pole, the buzzer B other end, chip U2 pin 1, potentiometer RP, electric capacity C4 and rectifier bridge Q2 pin 4 also ground connection, the light-emitting diode D2 positive pole contact resistance R2 other end, described rectifier bridge Q2 pin 1 and pin 3 connection transformer T2 coil L4 two ends respectively, rectifier bridge Q2 pin 2 is contact resistance R5 and the electric capacity C4 other end respectively, the resistance R5 other end connects the potentiometer RP other end, potentiometer RP slide plate connects chip U2 pin 2 and chip U2 pin 6 respectively.
2. overvoltage crowbar according to claim 1, is characterized in that, described three terminal regulator U1 model is 7805.
3. overvoltage crowbar according to claim 1, is characterized in that, described chip U2 model is NE555.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520136699.4U CN204407858U (en) | 2015-03-05 | 2015-03-05 | A kind of overvoltage crowbar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520136699.4U CN204407858U (en) | 2015-03-05 | 2015-03-05 | A kind of overvoltage crowbar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204407858U true CN204407858U (en) | 2015-06-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520136699.4U Expired - Fee Related CN204407858U (en) | 2015-03-05 | 2015-03-05 | A kind of overvoltage crowbar |
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| CN (1) | CN204407858U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105407435A (en) * | 2015-11-26 | 2016-03-16 | 宁波柏人艾电子有限公司 | Audio adjusting circuit |
| CN105527482A (en) * | 2015-12-30 | 2016-04-27 | 国网山东郓城县供电公司 | Power system current monitoring system |
| CN106374426A (en) * | 2016-11-02 | 2017-02-01 | 成都俊巡科技有限公司 | Load power-based automatic cutoff circuit |
| CN106532638A (en) * | 2016-11-02 | 2017-03-22 | 成都俊巡科技有限公司 | Circuit capable of limiting load power |
| CN106972769A (en) * | 2017-05-16 | 2017-07-21 | 国网河南省电力公司平顶山供电公司 | A kind of light current electrical load overvoltage crowbar |
| CN107041027A (en) * | 2017-05-04 | 2017-08-11 | 安徽庆恒信息科技有限公司 | Intelligent microwave oven |
| CN108199344A (en) * | 2017-12-29 | 2018-06-22 | 河南北瑞电子科技有限公司 | A kind of household appliance protecting device |
| CN111130089A (en) * | 2020-01-07 | 2020-05-08 | 惠州拓邦电气技术有限公司 | Switching power supply device |
-
2015
- 2015-03-05 CN CN201520136699.4U patent/CN204407858U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105407435A (en) * | 2015-11-26 | 2016-03-16 | 宁波柏人艾电子有限公司 | Audio adjusting circuit |
| CN105527482A (en) * | 2015-12-30 | 2016-04-27 | 国网山东郓城县供电公司 | Power system current monitoring system |
| CN105527482B (en) * | 2015-12-30 | 2018-05-18 | 国网山东郓城县供电公司 | A kind of electric system current monitoring system |
| CN106374426A (en) * | 2016-11-02 | 2017-02-01 | 成都俊巡科技有限公司 | Load power-based automatic cutoff circuit |
| CN106532638A (en) * | 2016-11-02 | 2017-03-22 | 成都俊巡科技有限公司 | Circuit capable of limiting load power |
| CN107041027A (en) * | 2017-05-04 | 2017-08-11 | 安徽庆恒信息科技有限公司 | Intelligent microwave oven |
| CN106972769A (en) * | 2017-05-16 | 2017-07-21 | 国网河南省电力公司平顶山供电公司 | A kind of light current electrical load overvoltage crowbar |
| CN108199344A (en) * | 2017-12-29 | 2018-06-22 | 河南北瑞电子科技有限公司 | A kind of household appliance protecting device |
| CN111130089A (en) * | 2020-01-07 | 2020-05-08 | 惠州拓邦电气技术有限公司 | Switching power supply device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150617 Termination date: 20160305 |
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| CF01 | Termination of patent right due to non-payment of annual fee |