CN210196097U - Fan locked rotor detection circuit for air purifier - Google Patents
Fan locked rotor detection circuit for air purifier Download PDFInfo
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- CN210196097U CN210196097U CN201921076118.7U CN201921076118U CN210196097U CN 210196097 U CN210196097 U CN 210196097U CN 201921076118 U CN201921076118 U CN 201921076118U CN 210196097 U CN210196097 U CN 210196097U
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- 238000001514 detection method Methods 0.000 title claims abstract description 23
- 239000003990 capacitor Substances 0.000 abstract description 7
- 241000894006 Bacteria Species 0.000 description 1
- 241000883990 Flabellum Species 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 239000008358 core component Substances 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
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
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- 239000002341 toxic gas Substances 0.000 description 1
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Abstract
A blower locked-rotor detection circuit for an air purifier comprises a blower, a freewheeling diode is connected on the blower in parallel, one end of the fan is connected with a power supply, the other end of the fan is connected with a first triode, the base electrode of the first triode is connected with a fan control signal interface through a first resistor, the fan control signal interface is connected with a first indicator light, the emitter of the first triode is grounded through a second resistor, the emitter of the first triode is connected with the base of the second triode through a first capacitor and a third resistor which are connected in series, a second capacitor and a fourth resistor which are connected in series are arranged between the emitter and the collector of the second triode, the collecting electrode of second triode is connected with the second pilot lamp through fourth resistance, the collecting electrode of second triode is connected with the power through fifth resistance, be equipped with the sixth resistance between the base of second triode and the collecting electrode.
Description
The technical field is as follows:
the utility model relates to a stifled detection circuitry that changes of fan for air purifier.
Background art:
air purifier mainly utilizes the fan with air suction machine, through built-in filter screen filtered air, can play the effect of filtering dust, peculiar smell, toxic gas and killing partial bacterium.
The fan is used as a core component of the air purifier, and the working state of the fan can directly influence the performance of the air purifier; when the flabellum of fan was blockked up by the foreign matter, can take place fan stall trouble, lead to the overheated inefficacy of fan, had very big potential safety hazard.
In the existing detection technology, the blower locked rotor fault is mainly realized by means of over-temperature detection, but because the over-temperature detection can detect various different faults, whether the locked rotor fault occurs or not can not be quickly distinguished by means of over-temperature detection, and the accuracy and the reaction speed cannot meet the use requirements.
The utility model has the following contents:
the embodiment of the utility model provides a fan stalling detection circuit for air purifier, structural design is reasonable, adopts two pilot lamps to distinguish the concrete operating condition of fan, and the problem that exists among the prior art has been solved to the stalling trouble that can be quick accurate detection goes out the fan.
The utility model discloses a solve the technical scheme that above-mentioned technical problem adopted and be:
a blower locked-rotor detection circuit for an air purifier comprises a blower, a freewheeling diode is connected on the blower in parallel, one end of the fan is connected with a power supply, the other end of the fan is connected with a first triode, the base electrode of the first triode is connected with a fan control signal interface through a first resistor, the fan control signal interface is connected with a first indicator light, the emitter of the first triode is grounded through a second resistor, the emitter of the first triode is connected with the base of the second triode through a first capacitor and a third resistor which are connected in series, a second capacitor and a fourth resistor which are connected in series are arranged between the emitter and the collector of the second triode, the collecting electrode of second triode is connected with the second pilot lamp through fourth resistance, the collecting electrode of second triode is connected with the power through fifth resistance, be equipped with the sixth resistance between the base of second triode and the collecting electrode.
The fan comprises a Buck driving circuit and a direct current motor.
The model number of the freewheeling diode is 1N 5206.
The first triode and the second triode are both NPN type triodes.
The fan control signal interface is a level signal interface.
The power supply voltage is 5V.
The utility model adopts the above structure, the fan is controlled to rotate or stop by connecting high level or low level on the fan control signal interface; the specific working state and the locked-rotor fault condition of the fan are distinguished by turning on or off the first indicator lamp and the second indicator lamp, the accurate detection of the locked-rotor fault of the fan is effectively realized, and the device has the advantages of being simple in structure, efficient, accurate and low in cost.
Description of the drawings:
fig. 1 is an electrical schematic diagram of the present invention.
The specific implementation mode is as follows:
in order to clearly illustrate the technical features of the present invention, the present invention is explained in detail by the following embodiments in combination with the accompanying drawings.
As shown in fig. 1, a blower locked-rotor detection circuit for an air purifier comprises a blower, a freewheeling diode connected in parallel to the blower, one end of the fan is connected with a power supply, the other end of the fan is connected with a first triode, the base electrode of the first triode is connected with a fan control signal interface through a first resistor, the fan control signal interface is connected with a first indicator light, the emitter of the first triode is grounded through a second resistor, the emitter of the first triode is connected with the base of the second triode through a first capacitor and a third resistor which are connected in series, a second capacitor and a fourth resistor which are connected in series are arranged between the emitter and the collector of the second triode, the collecting electrode of second triode is connected with the second pilot lamp through fourth resistance, the collecting electrode of second triode is connected with the power through fifth resistance, be equipped with the sixth resistance between the base of second triode and the collecting electrode.
The fan comprises a Buck driving circuit and a direct current motor.
The model number of the freewheeling diode is 1N 5206.
The first triode and the second triode are both NPN type triodes.
The fan control signal interface is a level signal interface.
The power supply voltage is 5V.
When the FAN control signal interface FAN is at a high level, the first triode Q1 is connected, the FAN is powered on to operate, the working current of the FAN changes in a pulse mode, the changed current generates changed voltage on the second resistor R2, and alternating current components of the changed voltage are transmitted through the first capacitor coupling and the third resistor R3 and act on the base electrode of the second triode Q2. When the base voltage of the second triode Q2 is higher than the conducting voltage, the second triode Q2 is conducted and grounded, at this time, the fan detection signal output end is grounded equivalently through the fourth resistor R4, and the output is at a low level; when the base voltage of the second triode Q2 is lower than the conducting voltage, the second triode Q2 is turned off, the detection signal output end is connected with the 5V power supply through the fourth resistor R4 and the fifth resistor R5, the output of the detection signal output end is high level, namely, the fan detection circuit outputs a pulse-shaped signal with high and low level conversion. When the fan control signal interface is at a low level, the fan stops rotating, and the fan detection signal output end is at a high level constantly. For better fault identification, the fan detection signal output end is subjected to logic inversion operation and is connected with a second indicator light LED 2.
When the fan control signal interface is at a high level and the fan detection signal output end is at a high level, the logic inversion operation output is at a high level, and at the moment, the first indicator light LED1 and the second indicator light LED2 are simultaneously lightened; when the FAN control signal FAN is at a high level and the FAN detection signal output end is at a low level, the logic inversion operation output is at a low level, the first indicator light LED1 is turned on, and the second indicator light LED2 is turned off; when the fan control signal interface is at a low level, the first indicator light LED1 and the second indicator light LED2 are turned off simultaneously.
In summary, when the fan control signal interface is at a high level, the first indicator light LED1 is normally on, and the second indicator light LED2 flashes, which indicates that the fan M is operating normally; when a locked-rotor fault occurs and the fan cannot work normally, the first indicator light LED1 is normally on, the second indicator light LED2 is turned off, and the locked-rotor fault occurs on the fan M at the moment; distinguish the concrete operating condition and the stifled commentaries on classics trouble condition of fan through two pilot lamps, effectively realized the accurate detection of fan stifled commentaries on classics trouble, circuit structure is simple, low cost, has higher use value, and the security is high.
The above-mentioned specific embodiments can not be regarded as the restriction to the scope of protection of the utility model, to technical personnel in this technical field, it is right the utility model discloses any replacement improvement or transform that embodiment made all fall within the scope of protection of the utility model.
The parts of the present invention not described in detail are the known techniques of those skilled in the art.
Claims (6)
1. The utility model provides a fan lock-up detection circuitry for air purifier which characterized in that: including the fan, it has freewheeling diode to connect in parallel on the fan, the power supply is connected to the one end of fan, and first triode is connected to the other end, the base of first triode has fan control signal interface through first resistance connection, fan control signal interface connection has first pilot lamp, the projecting pole of first triode passes through second resistance ground connection and sets up, the base of second triode is connected through the first electric capacity and the third resistance of looks series connection to the projecting pole of first triode, be equipped with the second electric capacity and the fourth resistance of looks series connection between the projecting pole and the collecting electrode of second triode, the collecting electrode of second triode has the second pilot lamp through the fourth resistance connection, the collecting electrode of second triode has the power through fifth resistance connection, be equipped with sixth resistance between the base and the collecting electrode of second triode.
2. The circuit of claim 1, wherein: the fan comprises a Buck driving circuit and a direct current motor.
3. The circuit of claim 1, wherein: the model number of the freewheeling diode is 1N 5206.
4. The circuit of claim 1, wherein: the first triode and the second triode are both NPN type triodes.
5. The circuit of claim 1, wherein: the fan control signal interface is a level signal interface.
6. The circuit of claim 1, wherein: the power supply voltage is 5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921076118.7U CN210196097U (en) | 2019-07-10 | 2019-07-10 | Fan locked rotor detection circuit for air purifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921076118.7U CN210196097U (en) | 2019-07-10 | 2019-07-10 | Fan locked rotor detection circuit for air purifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210196097U true CN210196097U (en) | 2020-03-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921076118.7U Expired - Fee Related CN210196097U (en) | 2019-07-10 | 2019-07-10 | Fan locked rotor detection circuit for air purifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210196097U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114060298A (en) * | 2020-08-04 | 2022-02-18 | 广东美的环境电器制造有限公司 | Control circuit and method of electric fan |
| CN114382716A (en) * | 2020-10-22 | 2022-04-22 | 广东美的环境电器制造有限公司 | Control circuit, control method, control device, equipment and medium of electric fan |
-
2019
- 2019-07-10 CN CN201921076118.7U patent/CN210196097U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114060298A (en) * | 2020-08-04 | 2022-02-18 | 广东美的环境电器制造有限公司 | Control circuit and method of electric fan |
| CN114060298B (en) * | 2020-08-04 | 2023-11-17 | 广东美的环境电器制造有限公司 | Control circuit and method of electric fan |
| CN114382716A (en) * | 2020-10-22 | 2022-04-22 | 广东美的环境电器制造有限公司 | Control circuit, control method, control device, equipment and medium of electric fan |
| CN114382716B (en) * | 2020-10-22 | 2023-11-21 | 广东美的环境电器制造有限公司 | Control circuit, control method, device, equipment and medium of electric fan |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200327 |