CN205304215U - Contactor protection control circuit and air conditioning equipment - Google Patents
Contactor protection control circuit and air conditioning equipment Download PDFInfo
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- CN205304215U CN205304215U CN201521134562.1U CN201521134562U CN205304215U CN 205304215 U CN205304215 U CN 205304215U CN 201521134562 U CN201521134562 U CN 201521134562U CN 205304215 U CN205304215 U CN 205304215U
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- control circuit
- power supply
- alternating current
- current power
- protection control
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Abstract
The utility model provides a contactor protection control circuit and air conditioning equipment, a termination alternating current power supply's of the contact of contactor live wire in this circuit of, the live wire port of another termination load, the zero line port of load connects alternating current power supply's zero line, contactor protection control circuit includes sampling unit, main control chip, switch tube and relay, for contactor protection control circuit, at the sampling unit who increases alternating current power supply in the control, when external input's alternating current power supply voltage abnormity, main control chip control switch turn -offs, and the just disconnection of contact switch of relay just no longer for the contactor power supply, avoids contactor coil to overflow, stops the air conditioning equipment even load and moves, contactor or load are burnt easily when having avoided voltage abnormity in the consumer problem.
Description
Technical field
This utility model relates to catalyst resist technology, particularly relates to a kind of catalyst protection control circuit and air-conditioning equipment.
Background technology
In current air-conditioner, general have application A.C. contactor to control the large current loads such as compressor, the power supply of off-premises station is typically also by indoor set control, and when the AC supply voltage exception of externally input, especially the remote districts such as rural area, power grid quality is severe, and voltage is relatively low or during recurrent fluctuations, the driving catalyst etc. being easily caused compressor of outdoor unit damages, and even compressor even load all can cause damage.
It is Vin=220V that current national electrical network exports biphase voltage rating, conventional air-conditioning uses A.C. contactor, its contact controls adhesive rated voltage Us, it can the fluctuation range U=75%��110%Us of normal adhesive, when selecting defeated rated voltage Us=220V, therefore pick-up voltage scope U=165��242V, when input voltage vin is lower than 165V or higher than 242V, namely beyond the scope of alternating current power supply, catalyst NC is likely to damage, especially when low pressure, power P=the I*Vin of catalyst NC, input voltage is more low, the electric current flowing through coil is more big, generate heat more severe, the reliability of coil burnout is more big, when input supply voltage Vin is in conjunction with critical voltage adnexa, such as Vin=165V, probe of contactor is in half attracting state, can produce instantaneous pressure arcing, cause that contact adhesion lost efficacy between contact.
Therefore failure mechanism is: line voltage is abnormal causes coil burnout. As supply voltage is too low, during pick-up voltage reliable lower than A.C. contactor, A.C. contactor is frequently adhesive at short notice, contact can not reliably adhesive, the electric current of control coil becomes greatly, causes that ac contactor coil burns.
Utility model content
This utility model purpose is in that to provide a kind of catalyst protection control circuit, it is intended to the problem that when solving electric voltage exception in electrical equipment, catalyst or load are easily burnt.
This utility model provides a kind of catalyst protection control circuit, the live wire of one termination alternating current power supply of the contact of this catalyst, the FireWire port port of another terminating load, the zero line port of described load connects the zero line of described alternating current power supply, and described catalyst protection control circuit includes sampling unit, main control chip, switching tube and relay;
The voltage of described alternating current power supply is sampled and exports sampled voltage at outfan by described sampling unit, the output of described sampling unit terminates the AD end of described main control chip, the output of described main control chip terminates the control end of described switching tube, the output head grounding of described switching tube, the input of described switching tube terminates one end of the coil of described relay, another termination working power of the coil of described relay; The contact switch one of described relay terminates the live wire of described alternating current power supply, one end of the coil of another described catalyst of termination, the zero line of another described alternating current power supply of termination of the coil of described catalyst; Wherein, control described switching tube to turn off when the described sampled voltage exception that the AD end of described main control chip detects.
Further, described catalyst protection control circuit also includes an overcurrent protector, and described overcurrent protector is connected between one end of the other end of the contact switch of described relay and the coil of described catalyst.
Further, described overcurrent protector is critesistor.
Further, described sampling unit includes rectification module and division module, the input of described rectification module terminates described alternating current power supply, the output of described rectification module terminates the input of described division module, and the outfan of described division module exports the described sampled voltage AD end to described main control chip.
Further, described rectification module is rectifier bridge.
Further, described division module includes the first divider resistance and the second divider resistance; The one of described first divider resistance terminates the positive output end of described rectifier bridge, other end ground connection; The one of described second divider resistance terminates the positive output end of described rectifier bridge, and another terminates the AD end of described main control chip.
Further, described sampling unit also includes filter capacitor, and described filter capacitor is in parallel with described first divider resistance.
Further, described switching tube is NPN type triode, the control base stage of end, input, outfan respectively NPN type triode, colelctor electrode, the emitter stage of described switching tube.
Additionally, additionally provide a kind of air-conditioning equipment, it is connected with alternating current power supply, including above-mentioned catalyst protection control circuit.
Further, described load is compressor.
Above-mentioned catalyst protection control circuit; voltage detecting function is increased on controlling; when the AC supply voltage exception of externally input; main control chip controls switch OFF; the contact switch of relay just disconnects, and just no longer powers to catalyst, it is to avoid contactor coil crosses stream; stop air-conditioning equipment even load to run, it is to avoid the problem that in electrical equipment, during electric voltage exception, catalyst or load are easily burnt.
Accompanying drawing explanation
Fig. 1 is the circuit theory schematic diagram of catalyst protection control circuit in this utility model one embodiment;
Fig. 2 is the circuit theory schematic diagram of catalyst protection control circuit in another embodiment of this utility model.
Detailed description of the invention
In order to make the technical problems to be solved in the utility model, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, this utility model is further elaborated. Should be appreciated that specific embodiment described herein is only in order to explain this utility model, be not used to limit this utility model.
Embodiment one:
Refer to Fig. 1; this utility model can be used for the catalyst protection control circuit in air-conditioning equipment; the live wire L of one termination alternating current power supply Vin of the contact of this catalyst NC; the FireWire port port of another terminating load M; the zero line port of load M meets the zero line N of alternating current power supply Vin, catalyst NC and protects control circuit to include sampling unit 10, main control chip MCU, switching tube Q and relay R Y.
The voltage of alternating current power supply Vin is sampled and exports sampled voltage at outfan by sampling unit 10, AD (analog digital conversion) end of the output termination main control chip MCU of sampling unit 10, the control end of the output termination switching tube Q of main control chip MCU, the output head grounding of switching tube Q, one end of the coil of the input contact relay RY of switching tube Q, another termination working power VCC of the coil of relay R Y; The contact switch one of relay R Y terminates the live wire L of alternating current power supply Vin, one end of the coil of another termination catalyst NC, the zero line N of another termination alternating current power supply Vin of the coil of catalyst NC; Wherein, control switching tube Q when the sampled voltage exception that the AD end of main control chip MCU detects to turn off.
In the present embodiment, sampling unit 10 includes rectification module BR and division module 11, the input of the output termination division module 11 of input termination the alternating current power supply Vin, rectification module BR of rectification module BR, the outfan of division module 11 exports the sampled voltage AD end to main control chip MCU. Preferably, rectification module is rectifier bridge. In other embodiments, rectification module BR obtains the sampled voltage before dividing potential drop with diode rectification, it would however also be possible to employ IC chip after can using transformer (transformator) blood pressure lowering, and collocation peripheral components etc. is constituted.
Division module includes the first divider resistance R1 and the second divider resistance R2; The positive output end V+ of the one termination rectifier bridge BR of the first divider resistance R1, other end ground connection; The positive output end V+ of the one termination rectifier bridge BR of the second divider resistance R2, the AD end of another termination main control chip MCU. Further, it is in parallel that rectification and voltage division module 10 also includes filter capacitor, filter capacitor and the first divider resistance R1.
It addition, switching tube Q is NPN type triode, switching tube Q controls the base stage of end, input, outfan respectively NPN type triode, colelctor electrode, emitter stage. In other embodiments, switching tube Q can also be metal-oxide-semiconductor.
Its operation principle is as follows, alternating current power supply Vin inputs after rectifier bridge BR, convert high direct voltage VDC to, high direct voltage VDC passes through divider resistance R1, R2 blood pressure lowering dividing potential drop, high direct voltage VDC is converted to light current voltage, form low pressure sampled voltage and receive on the AD mouth of main control chip MCU, sample again through the AD of main control chip MCU and determine the ac voltage of current input, judge whether AC overvoltage protection further according to this magnitude of voltage, when monitoring alternating current power supply Vin input voltage beyond threshold value, or moment fall and exceed threshold value, then main control chip MCU drives switching tube Q by exporting signal, switching tube Q drives relay R Y, relay R Y drives A.C. contactor NC again, A.C. contactor NC is by controlling the break-make of power supply input live wire L, thus controlling the action of compressor M even load M. when judging overload, disconnect catalyst NC, it is to avoid catalyst NC coil causes exception because input voltage is abnormal, as the phenomenon such as is burnt in coil burnout, contact.
Embodiment two:
Refer to Fig. 2, increase overcurrent protector with embodiment one the difference is that, A.C. contactor NC controls loop, generally select critesistor R3. Concrete, overcurrent protector is connected between one end of the other end of the contact switch of relay R Y and the coil of catalyst NC.
Its operation principle is as follows, during such as alternating current power supply Vin input voltage lower than 165V, if the control coil electric current that I is A.C. contactor NC, then input power P=I*Vin, input voltage vin is more low, the electric current I flowing through coil is more big, the resistance of critesistor R3 can become big, the change of resistance loop current, thus suppressing the increase of I, when critesistor R3 resistance is infinitely great close to when opening a way, the electric current of I tends to 0, can be considered that control loop disconnects, it is effectively protected the damage that catalyst NC coil brings because of heating, after controlling voltage Vin release, critesistor R3 resistance recovers normal, circuit enters and normally controls rule, critesistor R3 can protect repeatedly, improve the reliability of circuit.
In the above-described embodiment, main control chip MCU is single-chip microcomputer. The contact switch of relay R Y can be normally opened contact switch, it is also possible to be normally-closed contact switch. When contact switch is normally opened contact switch, when alternating current power supply Vin is normal, main control chip MC exports signal always and drives audion Q conducting; During alternating current power supply Vin exception, main control chip MC then disconnects the output signal driving audion Q, makes audion Q turn off. When contact switch is normally-closed contact switch, when alternating current power supply Vin is normal, main control chip MC then disconnects the output signal driving audion Q, makes audion Q turn off; During alternating current power supply Vin exception, main control chip then exports signal and drives audion Q conducting.
Additionally, additionally provide a kind of air-conditioning equipment, it is connected with alternating current power supply Vin, protects control circuit including above-mentioned catalyst NC. Further, load M is compressor. In other embodiments, load M can also be the high power load equipment such as blower motor.
Above-mentioned catalyst NC protects control circuit abnormal according to power network fluctuation, the real-time response control to A.C. contactor, the damage that protection A.C. contactor causes because electrical network is abnormal; circuit is fairly simple; adopted device is less, less costly, effectively promotes operation of air conditioner reliability.
Voltage detecting function is increased on controlling, when the alternating current power supply Vin electric voltage exception of externally input, main control chip MCU controls switch OFF, the contact switch of relay R Y just disconnects, power just no longer to catalyst NC, avoid contact with device NC coil and cross stream, stop air-conditioning equipment even load M and run, it is to avoid the problem that in electrical equipment, during electric voltage exception, catalyst NC or load M easily burns.
The foregoing is only preferred embodiment of the present utility model; not in order to limit this utility model; all any amendment, equivalent replacement and improvement etc. made within spirit of the present utility model and principle, should be included within protection domain of the present utility model.
Claims (10)
1. a catalyst protection control circuit, the live wire of one termination alternating current power supply of the contact of this catalyst, the FireWire port port of another terminating load, the zero line port of described load connects the zero line of described alternating current power supply, it is characterized in that, described catalyst protection control circuit includes sampling unit, main control chip, switching tube and relay;
The voltage of described alternating current power supply is sampled and exports sampled voltage at outfan by described sampling unit, the output of described sampling unit terminates the AD end of described main control chip, the output of described main control chip terminates the control end of described switching tube, the output head grounding of described switching tube, the input of described switching tube terminates one end of the coil of described relay, another termination working power of the coil of described relay; The contact switch one of described relay terminates the live wire of described alternating current power supply, one end of the coil of another described catalyst of termination, the zero line of another described alternating current power supply of termination of the coil of described catalyst; Wherein, control described switching tube to turn off when the described sampled voltage exception that the AD end of described main control chip detects.
2. catalyst protection control circuit as claimed in claim 1; it is characterized in that; described catalyst protection control circuit also includes an overcurrent protector, and described overcurrent protector is connected between one end of the other end of the contact switch of described relay and the coil of described catalyst.
3. catalyst protection control circuit as claimed in claim 2, it is characterised in that described overcurrent protector is critesistor.
4. the catalyst protection control circuit as described in claim 1,2 or 3; it is characterized in that; described sampling unit includes rectification module and division module; the input of described rectification module terminates described alternating current power supply; the output of described rectification module terminates the input of described division module, and the outfan of described division module exports the described sampled voltage AD end to described main control chip.
5. catalyst protection control circuit as claimed in claim 4, it is characterised in that described rectification module is rectifier bridge.
6. catalyst protection control circuit as claimed in claim 5, it is characterised in that described division module includes the first divider resistance and the second divider resistance; The one of described first divider resistance terminates the positive output end of described rectifier bridge, other end ground connection; The one of described second divider resistance terminates the positive output end of described rectifier bridge, and another terminates the AD end of described main control chip.
7. catalyst protection control circuit as claimed in claim 6, it is characterised in that described sampling unit also includes filter capacitor, and described filter capacitor is in parallel with described first divider resistance.
8. catalyst protection control circuit as claimed in claim 1, it is characterised in that described switching tube is NPN type triode, the control base stage of end, input, outfan respectively NPN type triode, colelctor electrode, the emitter stage of described switching tube.
9. an air-conditioning equipment, is connected with alternating current power supply, it is characterised in that include the catalyst protection control circuit described in any one of claim 1 to 8.
10. air-conditioning equipment as claimed in claim 9, it is characterised in that described load is compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521134562.1U CN205304215U (en) | 2015-12-30 | 2015-12-30 | Contactor protection control circuit and air conditioning equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521134562.1U CN205304215U (en) | 2015-12-30 | 2015-12-30 | Contactor protection control circuit and air conditioning equipment |
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| Publication Number | Publication Date |
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| CN205304215U true CN205304215U (en) | 2016-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201521134562.1U Active CN205304215U (en) | 2015-12-30 | 2015-12-30 | Contactor protection control circuit and air conditioning equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113937738A (en) * | 2021-10-14 | 2022-01-14 | 珠海拓芯科技有限公司 | Overvoltage protection unit and overvoltage protection method for input alternating-current power supply and air conditioner |
-
2015
- 2015-12-30 CN CN201521134562.1U patent/CN205304215U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113937738A (en) * | 2021-10-14 | 2022-01-14 | 珠海拓芯科技有限公司 | Overvoltage protection unit and overvoltage protection method for input alternating-current power supply and air conditioner |
| CN113937738B (en) * | 2021-10-14 | 2023-11-28 | 宁波奥克斯电气股份有限公司 | Overvoltage protection unit for input alternating current power supply, overvoltage protection method and air conditioner |
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