CN202127232U - Lightning-proof and overcurrent, overvoltage and undervoltage protection circuit - Google Patents
Lightning-proof and overcurrent, overvoltage and undervoltage protection circuit Download PDFInfo
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- CN202127232U CN202127232U CN2011201981497U CN201120198149U CN202127232U CN 202127232 U CN202127232 U CN 202127232U CN 2011201981497 U CN2011201981497 U CN 2011201981497U CN 201120198149 U CN201120198149 U CN 201120198149U CN 202127232 U CN202127232 U CN 202127232U
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Abstract
The utility model relates to a lightning-proof and overcurrent, overvoltage and undervoltage protection circuit, which comprises a lightning-proof and overcurrent protection circuit, a rectifying circuit, an alternating voltage sampling circuit, an overvoltage protection circuit, an undervoltage protection circuit, a microprocessor, a relay control circuit and a reset circuit. The microprocessor is connected with the overvoltage protection circuit, the undervoltage protection circuit, the relay control circuit and the reset circuit respectively. The alternating voltage sampling circuit is connected with the lightning-proof and overcurrent protection circuit, the overvoltage protection circuit and the undervoltage protection circuit respectively. The rectifying circuit is connected with the lightning-proof and overcurrent protection circuit and the microprocessor respectively. The microprocessor controls the relay control circuit to open and close according to output signals of the overvoltage protection circuit and the undervoltage protection circuit. The lightning-proof and overcurrent, overvoltage and undervoltage protection circuit has the advantages of being simple in circuit, low in cost and small in volume.
Description
Technical field
The utility model belongs to that a kind of lightning protection of family expenses supply power voltage is on fire, overcurrent, overvoltage, under-voltage protective circuit, can be used for the intelligent protection circuit of household electrical appliances such as compressor when electrical network is unusual of domestic air conditioning, refrigerator.
Background technology
Present universal day by day along with household electrical appliance such as China's air-conditioning, refrigerator, computers; And supply of electric power is not enough and electricity consumption is uneven, voltage ripple of power network is big, household electrical appliance often are damaged; Though the overvoltage/undervoltage protector of household electrical appliance is more on the market, does not have incorporate product.The overvoltage/undervoltage protective device probably can be classified as 2 types, and one type by protective tube or fuse, and piezoresistive element is formed, and when voltage surpassed its protection value, protection component blew, and in time cuts off the electricity supply, and plays a protective role.This type protector can not recover energized automatically when voltage recovers just often, uses very inconvenient.Another kind ofly form, when voltage surpasses the protection value, can cut off the electricity supply automatically, yet the possibility that this series products breaks down is very high by protective circuit, relay or controllable silicon; And do not have defencive functions such as lightning protection, overcurrent, accurate delay, can not household electrical appliance and supply line be played a protective role, and hardware circuit more complicated; The volume ratio of product is bigger; The failure rate that occurs is higher, and the voltage protection scope is non-adjustable, through retrieving the voltage protector that present MCU of no use controls.
In brief, prior art is to use hardware controls basically at present, complicated circuit, and cost is high, and the big inconvenience of volume is installed, and protective circuit does not have auto restore facility.
The utility model content
The purpose of the utility model is to overcome the shortcoming of prior art with not enough, and a kind of lightning protection, overcurrent, over under-voltage protection circuit are provided, and it is simple to have a circuit, and cost is low, the characteristics that volume is little.
The purpose of the utility model realizes through following technical proposals: this lightning protection, overcurrent, over under-voltage protection circuit comprise lightning protection and current foldback circuit, rectification circuit, alternating voltage sample circuit, overvoltage crowbar, under-voltage protecting circuit, microprocessor, control relay circuit and reset circuit; Microprocessor is connected with overvoltage crowbar, under-voltage protecting circuit, control relay circuit and reset circuit respectively; The alternating voltage sample circuit is connected with lightning protection and current foldback circuit, overvoltage crowbar and under-voltage protecting circuit respectively, and rectification circuit is connected with lightning protection and current foldback circuit, microprocessor respectively; Said microprocessor is according to the output signal of overvoltage crowbar and under-voltage protecting circuit, and the control relay control circuit is opened or be closed.
Said lightning protection and current foldback circuit comprise pressure-sensitive insurance ZR and the thermistor PTC1 that is in series.
Said rectification circuit comprises bridge rectifier, and the first electrochemical capacitor E1, the first voltage stabilizing didoe Z1 and the second voltage stabilizing didoe Z2 that are connected in parallel on the bridge rectifier output.
Said alternating voltage sample circuit comprises successively the 3rd diode D3 that connects, the 3rd resistance R 3, the 4th resistance R 4 and the 5th resistance R 5, and is connected on the 3rd resistance R 3, the tie point of the 4th resistance R 4 and the first adjustable resistance DP1 between the ground wire.
Said control relay circuit comprises the first triode Q1 and relay X1A; The base stage of the first triode Q1 is connected with microprocessor, and collector electrode is connected with relay X1A.
The utility model has following advantage and effect with respect to prior art:
1, the utility model is when receiving thunderbolt, big electric current, thereby the ZR in the current foldback circuit, PTC can cut off the electricity supply immediately electrical equipment is protected, and this kind protection can recover voluntarily; Protection voltage is adjustable, very easy to use.
2, when the line voltage overtension or cross when low single chip machine controlling circuit and can break off relay fast and cut off the electricity consumption power supply, and show this protective circuit through indicator light and work in which kind of state, make the client simple and clear.When line voltage recovered normal value, single chip machine controlling circuit control relay accurately was exported in the delay time that sets, delay time can when production, adjust according to customer requirement (acquiescence is 3 minutes).In delay time, the client also can remove time-delay through button, greatly facilitates the client.Can be applicable on the household electrical appliance such as domestic air conditioning, refrigerator, washing machine, can protect compressor stall when voltage is low to use effectively and cause damaging.
3, the utility model adopts microprocessor (MCU) as master controller; Automatically detect the electric voltage exception situation; And the deenergization of in time reporting to the police, thereby equipment such as protection household electrical appliance, hardware circuit is simple, control is reliable, cost is low; Volume is little, and has automatic recovery and functions such as emergency starting, voltage indication.
4, the alternating voltage sample circuit adopts quick comparator, can promptly and accurately inform microprocessor to the electric voltage exception situation and control.Delay recovery and emergency opening function after voltage is normal are directly controlled by MCU, can reduce the complicated circuit of former hardware time-delay, and be very easy to use and have intuitively voltage indicate.Cross current circuit and adopt the PTC protective circuit to form, improved the quick protection response speed of high voltage and high current.
Description of drawings
Fig. 1 is the electric functional-block diagram of the utility model intelligence overcurrent overvoltage/undervoltage protector;
Fig. 2 is the circuit diagram of the utility model intelligence overcurrent overvoltage/undervoltage protector;
Fig. 3 is the control flow chart of the utility model.
Embodiment
Below in conjunction with embodiment and accompanying drawing the utility model is described in further detail, but the execution mode of the utility model is not limited thereto.
Embodiment
As shown in Figure 1, the utility model comprises lightning protection and current foldback circuit, rectification circuit, alternating voltage sample circuit, overvoltage crowbar, under-voltage protecting circuit, microprocessor (being single chip machine controlling circuit), operating state indicating circuit, emergency key control circuit, control relay circuit, reset circuit and crystal oscillating circuit.Microprocessor is connected with overvoltage crowbar, under-voltage protecting circuit, operating state indicating circuit, emergency key control circuit, control relay circuit, reset circuit and crystal oscillating circuit respectively; The alternating voltage sample circuit is connected with lightning protection and current foldback circuit, overvoltage crowbar and under-voltage protecting circuit respectively, and rectification circuit is connected with lightning protection and current foldback circuit, microprocessor respectively.
As shown in Figure 2, lightning protection and current foldback circuit comprise pressure-sensitive insurance ZR and the thermistor PTC1 that is in series.Rectification circuit comprises bridge rectifier, and the first electrochemical capacitor E1, the first voltage stabilizing didoe Z1 and the second voltage stabilizing didoe Z2 that are connected in parallel on the bridge rectifier output.The alternating voltage sample circuit comprises successively the 3rd diode D3 that connects, the 3rd resistance R 3, the 4th resistance R 4 and the 5th resistance R 5, and is connected on the 3rd resistance R 3, the tie point of the 4th resistance R 4 and the first adjustable resistance DP1 between the ground wire.Overvoltage crowbar comprises the comparator that is connected with the 5th resistance R 5, and under-voltage protecting circuit comprises the comparator that is connected with the 5th resistance R 5.Crystal oscillating circuit comprises the 15 resistance R 15 and crystal oscillator XL that is in parallel, and the two ends after the 15 resistance R 15 and the crystal oscillator XL parallel connection all are connected with the pin of microprocessor.Control relay circuit comprises the first triode Q1 and relay X1A; The base stage of the first triode Q1 is connected with microprocessor, and collector electrode is connected with relay X1A.
Rectification circuit is from first resistance R 1; Through 1 step-down of first capacitor C, the first diode D1, the second diode D2, the 4th diode D4 and the 5th diode D5 rectification draw power supply and supply relay to use; After the first electrochemical capacitor E1, second resistance R 2; Through the first voltage stabilizing didoe Z1, the second voltage stabilizing didoe Z2 voltage stabilizing,, draw voltage and supply microprocessor to use again through the second electrochemical capacitor E2, second capacitor C 2.Take a sample through the 3rd diode D3,3 step-downs of the 3rd resistance R from line voltage during the alternating voltage sample circuit; After the 4th resistance R 4, the 5th resistance R the 5, the 14 resistance R 14, the first adjustable resistance DP1 dividing potential drop, be input to 5 pin of comparator IC2 in the overvoltage crowbar; 6 of comparator IC2; 7 pin link to each other and output to 2 pin of comparator IC2 in the overvoltage crowbar; Be input to 10 pin of comparator IC2 again through the 12 resistance R 12, the 6th resistance R 6 dividing potential drops; And the signal that the 8th resistance R 8 and the 7th resistance R 7 dividing potential drops draw is input to 3 pin of comparator IC2; 1 pin of comparator IC2 and 8 pin with 3 pin and 10 pin of signal feedback to comparator IC2, through the 13 resistance R 13 and the tenth resistance R 10, are input to signal 2 pin and 1 pin of microprocessor IC1 through the 9th resistance R 9 and the 11 resistance R 11 again after the 6th capacitor C 6 and 7 filtering of the 7th capacitor C.3 pin of microprocessor IC1 through the 16 resistance R 16 and the first triode Q1 to relay X1A and the 6th diode D6.Microprocessor IC1 through the signal (being the output signal of overvoltage crowbar and under-voltage protecting circuit) that obtains from 1 pin and 2 pin thus judging whether to need protection determines whether to relay signal by its unlatching or close the purpose that reaches control household electrical appliance power supply.18 pin of microprocessor IC1 through the 17 resistance R 17 to first LEDs 1,19 pin through the 18 resistance R 18 to second LEDs 2,19 pin through the 19 resistance R 19 to the 3rd LEDs 3.8 pin of microprocessor IC1 arrive button S1 through the 20 resistance R the 20, the 21 resistance R 21 and the 8th capacitor C 8 backs.1 pin of the chip IC3 that resets of microprocessor is through the 22 resistance R 22 to 3 pin, and 2 pin supply microprocessor to reset through the 9th capacitor C 9 to 3 pin.When circuit received strong interference, chip IC3 can make the microprocessor reliable reset through resetting.
Shown in Figure 3 is the control flow chart of the utility model, and when user's energized, the control procedure of the utility model is following:
S1, when microprocessor detects supply voltage and gets into high pressure or low-voltage variation, microprocessor can break off the power supply to relay immediately, thereby cuts off power supply, electric loading is used in protection; Red light is bright simultaneously, and amber light and green light go out and tell the user power utilization load to be in guard mode.
S2, when microprocessor detect supply voltage recover normal and delay time to (delay time is adjustable; Mainly be that the protection motor is in order to avoid the motor frequent starting; Delay time can be three minutes) time, microprocessor control relay adhesive immediately, energized is recovered the normal power supply with electric loading; Simultaneously bright, red light of green light and amber light go out and tell the user power utilization load to be in the normal power supply state, and with the delay time zero clearing.
S3, when microprocessor detects when being in guard mode with electric loading, the electricity consumption if the user is eager through the emergency key control circuit, realizes emergency service.
During high voltage when S4, the overcurrent that causes unusually when electrical network or thunderbolt, protect fast through pressure-sensitive insurance and PTC1.
Can according to client's demand circuit board be put in the supply socket of household electrical appliance, load current can be by the relay output decision of circuit board.The embodiment of the above is the preferred embodiment of the utility model only, is not the practical range that limits the utility model with this, so the variation that all shapes according to the utility model, principle are done all should be encompassed in the protection range of the utility model.
The foregoing description is the utility model preferred implementation; But the execution mode of the utility model is not restricted to the described embodiments; Other any do not deviate from change, the modification done under spirit and the principle of the utility model, substitutes, combination, simplify; All should be the substitute mode of equivalence, be included within the protection range of the utility model.
Claims (5)
1. a lightning protection, overcurrent, over under-voltage protection circuit is characterized in that: comprise lightning protection and current foldback circuit, rectification circuit, alternating voltage sample circuit, overvoltage crowbar, under-voltage protecting circuit, microprocessor, control relay circuit and reset circuit; Microprocessor is connected with overvoltage crowbar, under-voltage protecting circuit, control relay circuit and reset circuit respectively; The alternating voltage sample circuit is connected with lightning protection and current foldback circuit, overvoltage crowbar and under-voltage protecting circuit respectively, and rectification circuit is connected with lightning protection and current foldback circuit, microprocessor respectively; Said microprocessor is according to the output signal of overvoltage crowbar and under-voltage protecting circuit, and the control relay control circuit is opened or be closed.
2. lightning protection according to claim 1, overcurrent, over under-voltage protection circuit is characterized in that: said lightning protection and current foldback circuit comprise pressure-sensitive insurance ZR and the thermistor PTC1 that is in series.
3. lightning protection according to claim 1, overcurrent, over under-voltage protection circuit; It is characterized in that: said rectification circuit comprises bridge rectifier, and the first electrochemical capacitor E1, the first voltage stabilizing didoe Z1 and the second voltage stabilizing didoe Z2 that are connected in parallel on the bridge rectifier output.
4. lightning protection according to claim 1, overcurrent, over under-voltage protection circuit; It is characterized in that: said alternating voltage sample circuit comprises successively the 3rd diode D3 that connects, the 3rd resistance R 3, the 4th resistance R 4 and the 5th resistance R 5, and is connected on the 3rd resistance R 3, the tie point of the 4th resistance R 4 and the first adjustable resistance DP1 between the ground wire.
5. lightning protection according to claim 1, overcurrent, over under-voltage protection circuit is characterized in that: said control relay circuit comprises the first triode Q1 and relay X1A; The base stage of the first triode Q1 is connected with microprocessor, and collector electrode is connected with relay X1A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201981497U CN202127232U (en) | 2011-06-14 | 2011-06-14 | Lightning-proof and overcurrent, overvoltage and undervoltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201981497U CN202127232U (en) | 2011-06-14 | 2011-06-14 | Lightning-proof and overcurrent, overvoltage and undervoltage protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202127232U true CN202127232U (en) | 2012-01-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201981497U Expired - Fee Related CN202127232U (en) | 2011-06-14 | 2011-06-14 | Lightning-proof and overcurrent, overvoltage and undervoltage protection circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN202127232U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102222875A (en) * | 2011-06-14 | 2011-10-19 | 广东志高空调有限公司 | Lightening protection, overcurrent, overvoltage-undervoltage protection circuit and control method |
| CN103911806A (en) * | 2014-03-25 | 2014-07-09 | 王斌 | One-button-operated full-automatic washing machine computer program controller |
| CN104377641A (en) * | 2014-11-24 | 2015-02-25 | 程信羲 | Thick-film active surge suppression module |
| CN105119232A (en) * | 2015-09-24 | 2015-12-02 | 湖南劲阳电子有限公司 | Circuit protecting device |
-
2011
- 2011-06-14 CN CN2011201981497U patent/CN202127232U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102222875A (en) * | 2011-06-14 | 2011-10-19 | 广东志高空调有限公司 | Lightening protection, overcurrent, overvoltage-undervoltage protection circuit and control method |
| CN103911806A (en) * | 2014-03-25 | 2014-07-09 | 王斌 | One-button-operated full-automatic washing machine computer program controller |
| CN104377641A (en) * | 2014-11-24 | 2015-02-25 | 程信羲 | Thick-film active surge suppression module |
| CN105119232A (en) * | 2015-09-24 | 2015-12-02 | 湖南劲阳电子有限公司 | Circuit protecting device |
| CN105119232B (en) * | 2015-09-24 | 2019-04-19 | 湖南劲阳电子有限公司 | A kind of circuit protective 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: 20120125 Termination date: 20160614 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |