CN205304229U - Relay control protection electric circuit and tame electric installation - Google Patents
Relay control protection electric circuit and tame electric installation Download PDFInfo
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- CN205304229U CN205304229U CN201521104236.6U CN201521104236U CN205304229U CN 205304229 U CN205304229 U CN 205304229U CN 201521104236 U CN201521104236 U CN 201521104236U CN 205304229 U CN205304229 U CN 205304229U
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Abstract
The utility model provides a drive coil termination DC power supply of relay control protection electric circuit and tame electric installation, relay in the circuit another termination of drive coil relay drive circuit's output, the relay control protection electric circuit include: the voltage detection circuit that restores to the throne detects the termination DC power supply to corresponding level signal is exported at the output to voltage swing according to DC power supply, control chip, detection port connects reset voltage detection circuit's output, output port connects relay drive circuit's input, the control chip basis whether level signal's state is selected to drive relay drive circuit work. Increasing the voltage detection circuit that resets, crossing when low as external input's alternating current voltage, control chip stops to export control signal, and the drive coil of relay does not have the electric current to flow through, and the relay drive coil does not produce the electromagnetic force, and the moving plate and the still of messenger's relay effectively break off.
Description
Technical field
The utility model relates to rly. protection technology, particularly relates to a kind of Control protection circuit and home appliance.
Background technology
In current conditioner, general have the forceful electric power loads such as application Control compressor, blower fan, four-way valve, and when the AC power of outside input occurs that voltage is lower, especially the remote districts such as rural area, power grid quality is severe, when voltage is lower, it is easy to cause driven compressor rly. etc. to damage.
Its failure mechanism is: when the driving coil of rly. flows through electric current, the driving coil of rly. make the moving plate of rly. relative to the electromagnetic force that the running gear of rly. produces and quiet be pulled together; When electrical network occurs that voltage is lower, the electric current of the driving coil flowing through rly. is too low, the electromagnetic force that the driving coil of rly. produces relative to the running gear of rly. diminishes, the moving plate of rly. and quiet can not effectively adhesives, between the moving plate of rly. and quiet, gap occurs, electric arc occur between the moving plate of rly. and quiet, the heat of electric arc burns rly..
Practical novel content
The utility model object is to provide a kind of Control protection circuit, it is intended to solve when the outside AC supply voltage inputted is too low, and rly. can not problem that effectively adhesive is easily burnt.
The utility model provides a kind of Control protection circuit; the driving coil one termination direct supply of described rly.; the described driving coil the other end succeeds the output terminal of electrical apparatus driving circuit, and described direct supply is obtained by AC power transformation, and described Control protection circuit comprises:
One reset voltage detecting circuit, direct supply described in detection termination, and the voltage size according to direct supply exports corresponding level signal at output terminal;
One control chip, detection port connects the output terminal of described reset voltage detecting circuit, and output port connects the input terminus of described rly. driving circuit, and described control chip is according to whether the condition selecting of described level signal drives described rly. drive circuit works.
Further, described reset voltage detecting circuit comprises first point of compressive resistance, the 2nd point of compressive resistance, the first switching tube, the first stake resistance, the first output resistance, voltage stabilizing tube and the first electric capacity, wherein:
Direct supply described in the input termination of described first switching tube, the control end of described first switching tube connects described direct supply by described first point of compressive resistance, also by described 2nd point of compressive resistance ground connection, the output terminal of described first switching tube is by described first ground resistance earth;
The output terminal of the first switching tube described in one termination of described first output resistance, the other end as described reset voltage detecting circuit output termination described in control the detection port of chip and described voltage stabilizing tube negative electrode, the plus earth of described voltage stabilizing tube, described first electric capacity is in parallel with described voltage stabilizing tube.
Further, described first switching tube is PNP type triode, and the input terminus of described first switching tube, control end, output terminal are respectively the emtting electrode of PNP type triode, base stage, collector electrode.
Further, also comprising chip port protection circuit, this chip port protection circuit is connected between the output terminal of described reset voltage detecting circuit and the detection port of described control chip.
Further, described chip port protection circuit comprises the first diode, the 2nd diode, the 2nd output resistance and the 2nd electric capacity, wherein,
Described 2nd output resistance is connected between the output terminal of described reset voltage detecting circuit and the detection port of described control chip, the anode of described first diode and the negative electrode of described 2nd diode connect the output terminal of described reset voltage detecting circuit, the negative electrode of described first diode connects an operating voltage, the plus earth of described 2nd diode, the detection port of chip is controlled, the other end ground connection described in one termination of described 2nd electric capacity.
Further, described first diode and the 2nd diode are schottky diode or fast quick-recovery diode.
Further, described control chip is micro-chip, and the detection port of described control chip is the reseting port of micro-chip.
Further, described rly. driving circuit is chip ULN2003.
Further, described rly. driving circuit comprises the 3rd diode, the 4th diode, the 2nd switching tube, the first input resistance and the 3rd point of compressive resistance, wherein:
The output terminal of chip is controlled described in one termination of described first input resistance, the control end of the 2nd switching tube described in another termination, between the control end that described 3rd point of compressive resistance is connected to described 2nd switching tube and output terminal, and the output head grounding of described 2nd switching tube, the driving coil the other end of rly. described in the input termination of described 2nd switching tube, and be connected with the anode of described 3rd diode and the negative electrode of the 4th diode, the negative electrode of described 3rd diode connects a working power, the plus earth of described 4th diode.
Additionally provide a kind of home appliance, incoming transport power supply, comprise rly. and above-mentioned Control protection circuit.
Above-mentioned Control protection circuit increases reset voltage detecting circuit; when the AC supply voltage of outside input is too low; control chip stops exporting control signal; the driving coil of rly. does not have electric current to flow through; rly. drives coil not produce electromagnetic force, makes moving plate and the quiet effectively disconnection of rly..
Accompanying drawing explanation
Fig. 1 is the schematic circuit diagram of the utility model better embodiment repeat circuit Control protection circuit.
Embodiment
In order to make the technical problems to be solved in the utility model, technical scheme and useful effect clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated. It is to be understood that specific embodiment described herein is only in order to explain the utility model, and it is not used in restriction the utility model.
Refer to Fig. 1; the better embodiment of the utility model can be applicable to the protection circuit of the Control in home appliance (such as air-conditioning, refrigerator etc.); the driving coil one termination direct supply VDD of its relay R Y; driving the coil the other end to succeed the output terminal of electrical apparatus driving circuit 11, direct supply VDD is obtained by AC power Vin (such as domestic electric network voltage) transformation
Specifically, AC power Vin is converted to light current direct supply VDD by alternating-current direct stream translation IC circuit 1, direct supply VDD does not stablize constant, and direct supply VDD becomes high with AC power Vin voltage and becomes high, and direct supply VDD becomes low with direct supply Vin voltage and becomes low; Direct supply VDD is the service voltage of relay R Y. Alternating-current direct stream translation IC circuit 1 for switching power source chip or can be made up of simple transformer, rectification bridge and filter capacitor.
In addition, by DC voltage-stabilizing IC circuit 2, direct supply VDD being converted to working power (or operating voltage) VCC is that the chip in Control protection circuit or discrete component are powered. DC voltage-stabilizing IC circuit 2 can be 7805 voltage stabilizing circuit, it is also possible to is DC-DC voltage stabilizing circuit.
In the present embodiment, Control protection circuit comprises reset voltage detecting circuit 12, control chip MCU and chip port protection circuit 13.
The detection termination direct supply VDD of reset voltage detecting circuit 12, and the voltage size according to direct supply VDD exports corresponding level signal at output terminal. The detection port 4 of control chip MCU connects the output terminals A 1 of reset voltage detecting circuit 12, the output port 3 of control chip MCU succeeds the input terminus of electrical apparatus driving circuit 11, and chip MCU is according to whether the condition selecting of level signal drives rly. driving circuit 11 to work in control. Chip port protection circuit 13 is connected between the output terminals A 1 of reset voltage detecting circuit 12 and the detection port 4 of control chip MCU.
Control chip MCU is micro-chip, and the detection port 4 of control chip MCU is the reseting port 4 of micro-chip. UPD78F0515AGB-GAF-AX or the R7F0C903-908 micro-chip chip of the optional auspicious Sa (brand) of micro-chip. In the present embodiment, control chip MCU suppose there is has at least 4 ports: port 1 and port 2 are the power supply port of control chip MCU. Output port 3 can export high level or low voltage, is high resistance state when set. Reseting port 4 is when high level being detected, control chip MCU normal operation, the output port 3 of control chip MCU exports control signal, when lower level being detected, control chip MCU enters reset mode, and the output port 3 of control chip MCU stops exporting control signal.
Wherein in an embodiment, reset voltage detecting circuit 12 comprises first point of compressive resistance R1, the 2nd point of compressive resistance R2, the first switching tube Q1, the first stake resistance R3, the first output resistance R4, voltage stabilizing tube DZ and the first electric capacity C1.
The input termination direct supply VDD of the first switching tube Q1, the control end of the first switching tube Q1 meets direct supply VDD by first point of compressive resistance R1, and also by the 2nd point of compressive resistance R2 ground connection, the output terminal of the first switching tube Q1 is by the first stake resistance R3 ground connection; The output terminal of the one termination first switching tube Q1 of the first output resistance R4, the other end connects, as the output terminals A 1 of reset voltage detecting circuit 12, the detection port 4 and voltage stabilizing tube DZ negative electrode that control chip MCU, the plus earth of voltage stabilizing tube DZ, the first electric capacity C1 is in parallel with voltage stabilizing tube DZ.
Preferably, the first switching tube Q1 is PNP type triode, and the input terminus of the first switching tube Q1, control end, output terminal are respectively the emtting electrode of PNP type triode, base stage, collector electrode. In other embodiments, the first switching tube Q1 can manage for MOS.
By selecting one point of compressive resistance, the 2nd point of compressive resistance R2, the first switching tube Q1, the first stake resistance R3, the first output resistance R4, voltage stabilizing tube DZ and the rational parameter value of the first electric capacity C1, make when direct supply VDD is greater than critical voltage Vr (setting the minimum pick-up voltage that critical voltage Vr equals relay R Y), first switching tube Q1 conducting, output terminals A 1 is high level; When direct supply VDD is less than critical voltage Vr, the first switching tube Q1 ends, and output terminals A 1 is lower level;
The effect of voltage stabilizing tube DZ be but during the first switching tube Q1 conducting, the voltage that direct supply VDD exports through the first switching tube Q1 collector electrode is after the voltage stabilizing step-down of voltage stabilizing tube DZ, make reseting port 4 voltage outputting to control chip MCU can not exceed its maximum voltage that can bear, because it is lower than driving the direct supply VDD of relay R Y to give the control operating voltage VCC that chip MCU powers, as direct supply VDD be 12V, operating voltage VCC is 5V, and the voltage on reseting port 4 can not more than 5V.
Wherein in an embodiment, chip port protection circuit 13 comprises the first diode D1, the 2nd diode D2, the 2nd output resistance R5 and the 2nd electric capacity C2.
2nd output resistance R5 is connected between the output terminals A 1 of reset voltage detecting circuit 12 and the detection port 4 of control chip MCU, the anode of the first diode D1 and the negative electrode of the 2nd diode D2 connect the output terminals A 1 of reset voltage detecting circuit 12, the negative electrode of the first diode D1 connects an operating voltage, the plus earth of the 2nd diode D2, the detection port 4 of the one termination control chip MCU of the 2nd electric capacity C2, the other end ground connection.
Chip port protection circuit 13 improves control chip MCU port immunity from interference. First diode D1 and the 2nd diode D2 is schottky diode or quick recovery-type diode, for being protected by the port of control chip MCU; 2nd output resistance R5 and the 2nd electric capacity C2 is for improving immunity from interference; This partial circuit be for the protection of with raising immunity from interference, when without this partial circuit, Control protection circuit can also normally use. Wherein in an embodiment, rly. driving circuit 11 is chip ULN2003.
In another embodiment, rly. driving circuit 11 comprises the 3rd diode D3, the 4th diode D4, the 2nd switching tube Q2, the first input resistance R6 and the 3rd point of compressive resistance R7. The output port 3 of the one termination control chip MCU of the first input resistance R6, the control end of another termination the 2nd switching tube Q2, between the control end that 3rd point of compressive resistance R7 is connected to the 2nd switching tube Q2 and output terminal, and the 2nd output head grounding of switching tube Q2, the driving coil the other end of the input relay termination RY of the 2nd switching tube Q2, and be connected with the anode of the 3rd diode D3 and the negative electrode of the 4th diode D4, the negative electrode of the 3rd diode D3 connects a working power, the plus earth of the 4th diode D4.
In the present embodiment, the 2nd switching tube Q2 is NPN type triode, and the input terminus of the 2nd switching tube Q2, output terminal, control end are respectively the collector electrode of NPN type triode, emtting electrode, base stage. In other embodiments, the 2nd switching tube Q2 can manage for MOS.
The feature of this circuit is, when the output port 3 of control chip MCU exports high level, and rly. driving circuit 11 conducting, the driving coil of relay R Y flows through electric current; When the output port 3 of control chip MCU exports lower level, rly. driving circuit 11 ends, and the driving coil of relay R Y does not have electric current to flow through.
Protecting in circuit at Control, the minimum pick-up voltage of relay R Y is critical voltage Vr; When relay R Y coil flows through electric current, the driving coil of relay R Y produces electromagnetic force relative to the running gear of relay R Y; Assuming that the driving coil two ends of relay R Y initially do not have voltage, when the voltage being greater than critical voltage Vr that the driving coil two ends of relay R Y apply, the electromagnetic force of generation is enough big, make the moving plate of relay R Y and quiet be pulled together; When the voltage being less than critical voltage Vr that the driving coil two ends of relay R Y apply, the electromagnetic force produced is big not, between the moving plate of relay R Y and quiet, gap occurs, if relay R Y load 14 is forceful electric power load, electric arc may occur between the moving plate of relay R Y and quiet, the heat of electric arc burns relay R Y.
In Control protection circuit working process:
When AC power Vin voltage is normal, direct supply VDD is greater than critical voltage Vr, it is high level that reset voltage detecting circuit 12 exports to the reseting port 4 of control chip MCU, control chip MCU normally runs, when control needs, the output port 3 of control chip MCU exports high level, rly. driving circuit 11 conducting, the driving coil of relay R Y has electric current to flow through, because direct supply VDD is greater than critical voltage Vr, it is enough big that the driving coil of relay R Y produces electromagnetic force relative to the running gear of relay R Y, the moving plate of relay R Y and quiet reliable adhesive.
AC power is when Vin reduces, when Vin low to a certain value time, direct supply VDD is less than critical voltage Vr, and it is lower level that reset voltage detecting circuit 12 exports to the reseting port 4 of control chip MCU, control chip MCU is for reset mode, and the output port 3 of control chip MCU is high resistance state; The driving coil of relay R Y does not have electric current to flow through, the driving coil of relay R Y generation electromagnetic force useless relative to the running gear of relay R Y, ensures moving plate and the quiet reliably disconnection of relay R Y.
Applicating example:
Parameter type selecting is: operating voltage VCC=5V, critical voltage Vr=7.7V; First switching tube Q1 magnification be 200 and emtting electrode be 0.7V to base stage conduction voltage drop, first point of compressive resistance R1 is 510 ��, 2nd point of compressive resistance R2R2 is 5.1K ��, first stake resistance R3 is 10K ��, first output resistance R4 is 1K ��, voltage stabilizing tube DZ voltage of voltage regulation is 4.7V, and the first electric capacity C1 is 0.1uF;
When assuming AC power Vin=220V, direct supply VDD is 12V, now the level of the output terminals A 1 of reset voltage detecting circuit 12 is 4.7V, control chip MCU normally runs, when control needs, the output port 3 of control chip MCU exports high level, rly. driving circuit 11 conducting, the driving coil of relay R Y has electric current to flow through, because direct supply VDD > critical voltage is Vr, it is enough big that the driving coil of relay R Y produces electromagnetic force relative to the running gear of relay R Y, relay R Y moving plate and quiet reliable adhesive;
Assume that Vin voltage slowly reduces from 220V, direct supply vdd voltage is along with slowly becoming low, as direct supply VDD < critical voltage Vr=7.7V, when now the base stage voltage of the first switching tube Q1 is lower than 7.7*0.51/ (0.51+5.1)=0.7V, first switching tube Q1 ends, and the level of the output terminals A 1A1 of reset voltage detecting circuit 12 is 0V; Chip MCU is for reset mode in control, and the output port 3 of MCU is high resistance state; The driving coil of relay R Y does not have electric current to flow through, the driving coil of relay R Y generation electromagnetic force useless relative to the running gear of relay R Y, ensures moving plate and the quiet reliably disconnection of relay R Y.
Whether wherein said reset voltage detecting circuit 12 has exception for monitoring the driving direct supply VDD of relay R Y; the control signal rear drive forceful electric power load 14 that rly. driving circuit 11 receives self-acting control chip MCU output runs; control chip MCU processes input reset signal and exports control signal; its advantage is: available protecting rly. reliable operation; when electrical network occurs that voltage is lower, the timely and effective disconnection of rly., is adopted device less; cost is lower, reliability height.
The foregoing is only better embodiment of the present utility model; not in order to limit the utility model; all any amendment, equivalent replacement and improvement etc. done within spirit of the present utility model and principle, all should be included within protection domain of the present utility model.
Claims (10)
1. a Control protection circuit; the driving coil one termination direct supply of described rly., the described driving coil the other end succeeds the output terminal of electrical apparatus driving circuit, and described direct supply is obtained by AC power transformation; it is characterized in that, described Control protection circuit comprises:
One reset voltage detecting circuit, direct supply described in detection termination, and the voltage size according to direct supply exports corresponding level signal at output terminal;
One control chip, detection port connects the output terminal of described reset voltage detecting circuit, and output port connects the input terminus of described rly. driving circuit, and described control chip is according to whether the condition selecting of described level signal drives described rly. drive circuit works.
2. Control protection circuit as claimed in claim 1; it is characterized in that; described reset voltage detecting circuit comprises first point of compressive resistance, the 2nd point of compressive resistance, the first switching tube, the first stake resistance, the first output resistance, voltage stabilizing tube and the first electric capacity, wherein:
Direct supply described in the input termination of described first switching tube, the control end of described first switching tube connects described direct supply by described first point of compressive resistance, also by described 2nd point of compressive resistance ground connection, the output terminal of described first switching tube is by described first ground resistance earth;
The output terminal of the first switching tube described in one termination of described first output resistance, the other end as described reset voltage detecting circuit output termination described in control the detection port of chip and described voltage stabilizing tube negative electrode, the plus earth of described voltage stabilizing tube, described first electric capacity is in parallel with described voltage stabilizing tube.
3. Control protection circuit as claimed in claim 2, it is characterised in that, described first switching tube is PNP type triode, and the input terminus of described first switching tube, control end, output terminal are respectively the emtting electrode of PNP type triode, base stage, collector electrode.
4. as described in item as arbitrary in claims 1 to 3 Control protection circuit; it is characterized in that; also comprising chip port protection circuit, this chip port protection circuit is connected between the output terminal of described reset voltage detecting circuit and the detection port of described control chip.
5. Control protection circuit as claimed in claim 4, it is characterised in that, described chip port protection circuit comprises the first diode, the 2nd diode, the 2nd output resistance and the 2nd electric capacity, wherein,
Described 2nd output resistance is connected between the output terminal of described reset voltage detecting circuit and the detection port of described control chip, the anode of described first diode and the negative electrode of described 2nd diode connect the output terminal of described reset voltage detecting circuit, the negative electrode of described first diode connects an operating voltage, the plus earth of described 2nd diode, the detection port of chip is controlled, the other end ground connection described in one termination of described 2nd electric capacity.
6. Control protection circuit as claimed in claim 5, it is characterised in that, described first diode and the 2nd diode are schottky diode or fast quick-recovery diode.
7. Control protection circuit as claimed in claim 1, it is characterised in that, described control chip is micro-chip, and the detection port of described control chip is the reseting port of micro-chip.
8. Control protection circuit as claimed in claim 1, it is characterised in that, described rly. driving circuit is chip ULN2003.
9. Control protection circuit as claimed in claim 1, it is characterised in that, described rly. driving circuit comprises the 3rd diode, the 4th diode, the 2nd switching tube, the first input resistance and the 3rd point of compressive resistance, wherein:
The output terminal of chip is controlled described in one termination of described first input resistance, the control end of the 2nd switching tube described in another termination, between the control end that described 3rd point of compressive resistance is connected to described 2nd switching tube and output terminal, and the output head grounding of described 2nd switching tube, the driving coil the other end of rly. described in the input termination of described 2nd switching tube, and be connected with the anode of described 3rd diode and the negative electrode of the 4th diode, the negative electrode of described 3rd diode connects a working power, the plus earth of described 4th diode.
10. a home appliance, incoming transport power supply, it is characterised in that, comprise the protection circuit of the Control described in rly. and the arbitrary item of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521104236.6U CN205304229U (en) | 2015-12-24 | 2015-12-24 | Relay control protection electric circuit and tame electric installation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521104236.6U CN205304229U (en) | 2015-12-24 | 2015-12-24 | Relay control protection electric circuit and tame electric installation |
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| CN205304229U true CN205304229U (en) | 2016-06-08 |
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| CN201521104236.6U Active CN205304229U (en) | 2015-12-24 | 2015-12-24 | Relay control protection electric circuit and tame electric installation |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106452131A (en) * | 2016-11-30 | 2017-02-22 | 重庆中科芯亿达电子有限公司 | Voltage-stabilizing power source integrated circuit with relay drive |
| CN106799972A (en) * | 2017-02-28 | 2017-06-06 | 深圳巴斯巴科技发展有限公司 | A kind of charging electric vehicle box |
| CN110706976A (en) * | 2019-10-11 | 2020-01-17 | 广东美的制冷设备有限公司 | Relay control circuit, method and electric appliance |
| CN111668807A (en) * | 2020-05-07 | 2020-09-15 | 武汉市蓝电电子股份有限公司 | Overvoltage protection circuit for output port of battery test equipment |
| CN114888499A (en) * | 2022-07-14 | 2022-08-12 | 广东阿达智能装备有限公司 | Dry reed relay protection and drive circuit for wire bonding machine |
-
2015
- 2015-12-24 CN CN201521104236.6U patent/CN205304229U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106452131A (en) * | 2016-11-30 | 2017-02-22 | 重庆中科芯亿达电子有限公司 | Voltage-stabilizing power source integrated circuit with relay drive |
| CN106799972A (en) * | 2017-02-28 | 2017-06-06 | 深圳巴斯巴科技发展有限公司 | A kind of charging electric vehicle box |
| CN110706976A (en) * | 2019-10-11 | 2020-01-17 | 广东美的制冷设备有限公司 | Relay control circuit, method and electric appliance |
| CN110706976B (en) * | 2019-10-11 | 2022-05-20 | 广东美的制冷设备有限公司 | Relay control circuit, method and electric appliance |
| CN111668807A (en) * | 2020-05-07 | 2020-09-15 | 武汉市蓝电电子股份有限公司 | Overvoltage protection circuit for output port of battery test equipment |
| CN114888499A (en) * | 2022-07-14 | 2022-08-12 | 广东阿达智能装备有限公司 | Dry reed relay protection and drive circuit for wire bonding machine |
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