CN201774247U - Overvoltage protection circuit of alternating current fan - Google Patents
Overvoltage protection circuit of alternating current fan Download PDFInfo
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- CN201774247U CN201774247U CN2010202820549U CN201020282054U CN201774247U CN 201774247 U CN201774247 U CN 201774247U CN 2010202820549 U CN2010202820549 U CN 2010202820549U CN 201020282054 U CN201020282054 U CN 201020282054U CN 201774247 U CN201774247 U CN 201774247U
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- 238000005070 sampling Methods 0.000 claims abstract description 20
- 239000003990 capacitor Substances 0.000 claims description 9
- 238000001514 detection method Methods 0.000 abstract description 3
- 101100153768 Oryza sativa subsp. japonica TPR2 gene Proteins 0.000 description 5
- 101150102021 REL2 gene Proteins 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- NWJQLQGQZSIBAF-MLAUYUEBSA-N tacrolimus hydrate Chemical compound O.C1C[C@@H](O)[C@H](OC)C[C@@H]1\C=C(/C)[C@@H]1[C@H](C)[C@@H](O)CC(=O)[C@H](CC=C)/C=C(C)/C[C@H](C)C[C@H](OC)[C@H]([C@H](C[C@H]2C)OC)O[C@@]2(O)C(=O)C(=O)N2CCCC[C@H]2C(=O)O1 NWJQLQGQZSIBAF-MLAUYUEBSA-N 0.000 description 1
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Abstract
The utility model relates to an overvoltage crowbar of alternating current fan, its characterized in that includes voltage sampling circuit, MCU processing unit, drive execution circuit, voltage sampling circuit's output is connected with MCU processing unit's input, and MCU processing unit's output is connected with drive execution circuit's input, and drive execution circuit's output is connected with voltage sampling circuit's input. The utility model discloses owing to adopt by voltage sampling circuit, the overvoltage crowbar that MCU processing unit and drive actuating circuit constitute, detect the electric wire netting voltage through voltage sampling circuit, carry for MCU processing unit, after detecting the voltage value and surpassing the predetermined high-pressure detection value of MCU processing unit, drive actuating circuit reduces the voltage at fan both ends, prevent that the fan excessive pressure from damaging, after detecting the voltage value and being less than the predetermined low pressure detection value of MCU processing unit, drive actuating circuit directly inserts the commercial power with the fan, normal work.
Description
Technical field
The utility model relates to a kind of overvoltage crowbar of AC blower fan, particularly a kind of overvoltage crowbar of commercial electromagnetic oven AC blower fan.
Background technology
The cooling fan of commercial electromagnetic oven is generally the AC blower fan of rated voltage 220V or 380V.Because the fluctuation of the virtual voltage of electrical network is between ± 20%, commercial electromagnetic oven is in order to satisfy adaptability, and scope of design generally requires greater than ± 20%.But the voltage scope of design of 220V or the commercially available AC blower fan of 380V is no more than+and 10%, after surpassing+10%, AC blower fan raises because of electric current increases temperature, and life-span and reliability can reduce greatly.Therefore in commercial electromagnetic oven, must carry out overvoltage protection to blower fan.If adopt alternating current steady voltage plug or silicon-controlled voltage regulation circuit to carry out overvoltage protection, circuit complexity then, cost is higher, poor reliability, inconvenient maintenance.
The utility model content
The purpose of this utility model is to consider the problems referred to above, provides a kind of effectively simple, safe and reliable, the AC blower fan overvoltage crowbar that cost is low.
The technical solution of the utility model is: a kind of overvoltage crowbar of AC blower fan; it is characterized in that comprising voltage sampling circuit, MCU processing unit, drive executive circuit; the output of described voltage sampling circuit is connected with the input of MCU processing unit; the output of MCU processing unit is connected with the input that drives executive circuit, and the output that drives executive circuit is connected with the input of voltage sampling circuit.
Described voltage sampling circuit comprises voltage transformer T11, resistance R 11, resistance R 12, capacitor C 11, diode D11, wherein the primary coil of voltage transformer T11 is connected with civil power L1, L2 end, one end of secondary coil links to each other with the anode of diode D11, the other end is connected with earth terminal GND, the negative electrode of diode D11 links to each other with an end of resistance R 11, and the other end of resistance R 11 is connected with the input of resistance R 12, capacitor C 11 and MCU processing unit, the other end of capacitor C 11 and resistance R 12 is connected with earth terminal GND.
Described driving executive circuit comprises resistance R 31, resistance R 32, triode Q31, diode D31, relay R EL31 and at least one AC blower fan FAN31, wherein an end of resistance R 31 is connected with the output of MCU processing unit, the other end is connected with the base stage of triode Q31, the emitter of triode Q31 is connected with earth terminal GND, the C end of the collector electrode of triode Q31 and relay R EL31, the anode of diode D31 connects, the D end of relay R EL31, the negative electrode of diode D31 links to each other with DC power supply U, the COM end of AC blower fan FAN31 one end and relay R EL31, one end of resistance R 32 links to each other, the other end is connected with civil power L1 end, the NC end of relay R EL31 and the other end of resistance R 32, civil power L2 holds connection, and the NO end of relay R EL31 keeps unsettled.
The utility model is owing to adopt the overvoltage crowbar of being made up of voltage sampling circuit, MCU processing unit and driving executive circuit; by voltage sampling circuit detection of grid voltage; flow to the MCU processing unit; after detecting the magnitude of voltage high pressure detected value default above the MCU processing unit; drive the voltage reduction of executive circuit with the blower fan two ends; prevent that the blower fan overvoltage from damaging; after detecting magnitude of voltage and being lower than the low pressure detected value that the MCU processing unit presets; drive executive circuit blower fan is directly inserted civil power, operate as normal.The utility model circuit is simple, and is safe and reliable, and cost is low, and simple and effective overvoltage protection can be provided for the AC blower fan of commercial electromagnetic oven.
Description of drawings
Fig. 1 is the theory diagram of utility model;
Fig. 2 is the circuit theory diagrams of utility model embodiment;
Fig. 3 is that the inner blower fan overvoltage protection of the MCU of utility model embodiment switches subroutine flow chart.
Embodiment
Below in conjunction with embodiment and accompanying drawing the utility model is further specified.
As shown in Figure 1; the overvoltage crowbar of the utility model AC blower fan; comprise voltage sampling circuit 1, MCU processing unit 2, drive executive circuit 3; the output of described voltage sampling circuit 1 is connected with the input of MCU processing unit 2; the output of MCU processing unit 2 is connected with the input that drives executive circuit 3, and the output that drives executive circuit 3 is connected with the input of voltage sampling circuit 1.
As shown in Figure 2, described voltage sampling circuit 1 comprises voltage transformer T11, resistance R 11, resistance R 12, capacitor C 11, diode D11, wherein the primary coil of voltage transformer T11 is connected with civil power L1, L2 end, one end of secondary coil links to each other with the anode of diode D11, the other end is connected with earth terminal GND, the negative electrode of diode D11 links to each other with an end of resistance R 11, the other end of resistance R 11 is connected with the ADO input port of resistance R 12, capacitor C 11 and MCU processing unit 2, and the other end of capacitor C 11 and resistance R 12 is connected with earth terminal GND.
Described driving executive circuit 3 comprises resistance R 31, resistance R 32, triode Q31, diode D31, relay R EL31 and at least one AC blower fan FAN31, wherein an end of resistance R 31 is connected with the REL2 output port of MCU processing unit 2, the other end is connected with the base stage of triode Q31, the emitter of triode Q31 is connected with earth terminal GND, the C end of the collector electrode of triode Q31 and relay R EL31, the anode of diode D31 connects, the D end of relay R EL31, the negative electrode of diode D31 links to each other with DC power supply U, the COM end of AC blower fan FAN31 one end and relay R EL31, one end of resistance R 32 links to each other, the other end is connected with civil power L1 end, the NC end of relay R EL31 and the other end of resistance R 32, civil power L2 holds connection, and the NO end of relay R EL31 keeps unsettled.
As shown in Figure 3, described MCU processing unit 2 internal algorithm are, the fiducial value that high pressure detected value Vh and low pressure detected value Vl detect as return difference is set, and Tset is as the fiducial value of time-delay gate time.In the present embodiment, Vh=235V, Vl=230V, Tset=2s.
At first read voltage AD value, judge the high pressure flag bit;
If the high pressure flag bit is 0, whether then judge magnitude of voltage greater than Vh, be not more than then zero clearing delay counter, return main program; Greater than the counting of then delaying time, judge that whether the time-delay count value equals Tset, is not equal to and returns main program; Equal the then REL2 port of set high pressure flag bit and MCU, return main program.
If the high pressure flag bit is 1, whether then judge magnitude of voltage less than Vl, be not less than then zero clearing delay counter, return main program; Less than the counting of then delaying time, judge that whether the time-delay count value equals Tset, is not equal to and then returns main program; Equal the then REL2 port of zero clearing high pressure flag bit and MCU, return main program.
The operation principle of the utility model circuit is: after the voltage sampling circuit sample voltage value, give the ADO port of MCU, surpass set point Vh when detecting magnitude of voltage, set high pressure flag bit, time-delay is judged and is determined above behind the 235V, the REL2 port output high level of MCU, triode Q31 enters saturation condition in the driving executive circuit, the normally opened contact NO closure of relay R EL 31, normally-closed contact NC disconnects, dropping resistor R32 seals in the loop blower fan is carried out step-down, guarantees to surpass at+15% o'clock at line voltage, and blower voltage is no more than+10% scope.Return difference is set, when voltage is lower than 230V, the REL2 port output low level of MCU, Q31 enters cut-off state.The normally opened contact NO of relay R EL 31 disconnects, normally-closed contact NC closure, and blower fan directly inserts civil power, operate as normal.
Claims (3)
1. the overvoltage crowbar of an AC blower fan; it is characterized in that comprising voltage sampling circuit (1), MCU processing unit (2), drive executive circuit (3); the output of described voltage sampling circuit (1) is connected with the input of MCU processing unit (2); the output of MCU processing unit (2) is connected with the input that drives executive circuit (3), and the output that drives executive circuit (3) is connected with the input of voltage sampling circuit (1).
2. the overvoltage crowbar of AC blower fan according to claim 1; it is characterized in that described voltage sampling circuit (1) comprises voltage transformer T11; resistance R 11; resistance R 12; capacitor C 11; diode D11; the wherein primary coil of voltage transformer T11 and civil power L1; L2 holds connection; one end of secondary coil links to each other with the anode of diode D11; the other end is connected with earth terminal GND; the negative electrode of diode D11 links to each other with an end of resistance R 11; the other end of resistance R 11 and resistance R 12; the input of capacitor C 11 and MCU processing unit (2) connects, and the other end of capacitor C 11 and resistance R 12 is connected with earth terminal GND.
3. the overvoltage crowbar of AC blower fan according to claim 1; it is characterized in that described driving executive circuit (3) comprises resistance R 31; resistance R 32; triode Q31; diode D31; relay R EL31 and at least one AC blower fan FAN31; wherein an end of resistance R 31 is connected with the output of MCU processing unit (2); the other end is connected with the base stage of triode Q31; the emitter of triode Q 31 is connected with earth terminal GND; the C end of the collector electrode of triode Q31 and relay R EL31; the anode of diode D31 connects; the D end of relay R EL31; the negative electrode of diode D31 links to each other with DC power supply U; the COM end of AC blower fan FAN31 one end and relay R EL31; one end of resistance R 32 links to each other; the other end is connected with civil power L1 end; the NC end of relay R EL31 and the other end of resistance R 32; civil power L2 holds connection, and the NO end of relay R EL31 keeps unsettled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202820549U CN201774247U (en) | 2010-07-29 | 2010-07-29 | Overvoltage protection circuit of alternating current fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202820549U CN201774247U (en) | 2010-07-29 | 2010-07-29 | Overvoltage protection circuit of alternating current fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201774247U true CN201774247U (en) | 2011-03-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202820549U Expired - Fee Related CN201774247U (en) | 2010-07-29 | 2010-07-29 | Overvoltage protection circuit of alternating current fan |
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| Country | Link |
|---|---|
| CN (1) | CN201774247U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102650462A (en) * | 2012-06-05 | 2012-08-29 | 杭州源牌环境科技有限公司 | Wireless time sampling instrument for temperature controller of fan coil |
| CN110896210A (en) * | 2018-09-12 | 2020-03-20 | 简树 | Single-phase electric leakage circuit breaker control system |
-
2010
- 2010-07-29 CN CN2010202820549U patent/CN201774247U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102650462A (en) * | 2012-06-05 | 2012-08-29 | 杭州源牌环境科技有限公司 | Wireless time sampling instrument for temperature controller of fan coil |
| CN110896210A (en) * | 2018-09-12 | 2020-03-20 | 简树 | Single-phase electric leakage circuit breaker control system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: FOSHAN SHUNDE MIDEA ELECTRICAL HEATING APPLIANCES MANUFACTURING Co.,Ltd. Assignor: Midea Group Contract record no.: 2012440000405 Denomination of utility model: Overvoltage protection circuit of AC fan Granted publication date: 20110323 License type: Exclusive License Record date: 20120712 |
|
| C56 | Change in the name or address of the patentee |
Owner name: MIDEA GROUP CO., LTD. Free format text: FORMER NAME: MEIDI GROUP CO. LTD. |
|
| CP03 | Change of name, title or address |
Address after: 528311 Guangdong, Foshan, Beijiao, the United States, the United States and the United States on the avenue of the United States, the headquarters of the United States building B floor, District, 26-28 Patentee after: MIDEA GROUP Co.,Ltd. Address before: 528311 Penglai Road, Beijiao Town, Foshan District, Guangdong, China, Patentee before: Midea Group |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110323 Termination date: 20180729 |