CN112283907B - Fan shutdown control method and control circuit and air conditioner - Google Patents
Fan shutdown control method and control circuit and air conditioner Download PDFInfo
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- CN112283907B CN112283907B CN202011156671.9A CN202011156671A CN112283907B CN 112283907 B CN112283907 B CN 112283907B CN 202011156671 A CN202011156671 A CN 202011156671A CN 112283907 B CN112283907 B CN 112283907B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a fan stop control method, a control circuit and an air conditioner, wherein the fan stop control method comprises the following steps: respectively detecting the power supply voltage and the rotating speed of the fan in real time; judging whether the fan is stopped or not according to the power supply voltage and the fan rotating speed; if yes, controlling the fan to stop. The method effectively avoids the problem that the normal work of devices and the normal operation of the air conditioner are influenced by the fact that the phase current is too high due to the fact that the fan is out of step caused by the fact that the fan is shut down at a high rotating speed due to direct power failure.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a fan shutdown control method, a fan shutdown control circuit and an air conditioner.
Background
At present, the common circuit topology of the inverter air conditioner is as follows: the mains supply boosts the input 220V mains supply to the required bus voltage (usually 350V or 380V) through the PFC circuit after passing through the EMI filter circuit, the power supply parts of the switching power supply circuit, the compressor driving circuit and the direct current fan driving circuit are all led in from the bus output by the PFC circuit, and the switching power supply circuit supplies power for the main chip and the peripheral circuits thereof and the load circuit such as a four-way valve, an electronic expansion valve and the like.
Because of the existence of the large electrolytic capacitor in the PFC circuit, when an air conditioner external unit is powered off, the release of charges stored in the electrolytic capacitor needs a certain time, so that the under-voltage reset of the main chip also needs a certain time, namely the voltage is reduced from more than 300V of the bus voltage to the reset voltage of the main chip which is generally only a few volts (for example, the reset voltage of the main chip which is powered by 3.3V is generally 90 percent of the typical value of the normal power supply voltage), the consumption of a compressor and the like exists in the period, but a certain time is still needed when the reset voltage of the main chip is reduced to the reset voltage of the main chip, at the moment, the main chip still outputs a PWM signal to adjust the fan to operate according to the target wind speed because the main chip is not reset, when the bus voltage is not enough to support the operating speed (hereinafter referred to as the rotating speed), the loss of step is easy to occur, so that a certain phase current in three-phase current is increased rapidly, the fault protection of the fan is triggered, and frequent current impact possibly causes the damage of the fan driving circuit or other devices in the circuit to be damaged, affecting the normal use of the air conditioner.
Thus, the prior art has yet to be improved and enhanced.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a fan halt control method, a control circuit and an air conditioner, which can effectively solve the problem that the normal work of devices and the normal operation of the air conditioner are influenced by the overhigh phase current caused by the fan desynchronizing due to the high-speed halt of the fan caused by the direct power failure.
In order to achieve the purpose, the invention adopts the following technical scheme:
the fan shutdown control method comprises the following steps:
respectively detecting the power supply voltage and the rotating speed of the fan in real time;
judging whether the fan is stopped or not according to the power supply voltage and the rotating speed of the fan;
if yes, controlling the fan to stop.
In the method for controlling the shutdown of the fan, the step of judging whether the fan is shut down or not according to the power supply voltage and the rotating speed of the fan comprises the following steps:
and when the power supply voltage is less than the preset power supply voltage and the rotating speed of the fan is greater than the preset rotating speed of the fan, judging that the fan needs to be stopped.
In the fan stop control method, the power supply voltage comprises an input voltage and a bus voltage, and when the power supply voltage is smaller than a preset power supply voltage, the method comprises the following steps:
and when the input voltage is less than the first preset voltage, the bus voltage is less than the second preset voltage, and the reduction rate of the bus voltage is greater than the reduction rate of the preset bus voltage, the power supply voltage is less than the preset power supply voltage.
In the fan stop control method, the step of controlling the fan to stop comprises the following steps:
and stopping outputting a driving signal for driving the fan to rotate, and controlling the fan to stop.
A fan shutdown control circuit comprising:
the fan driving module is respectively connected with the control module and the fan;
the power supply module is used for providing power supply voltage for the fan driving module according to the alternating voltage;
the voltage sampling module is used for sampling the power supply voltage in real time and outputting the sampled voltage to the control module;
the control module is used for controlling the fan to stop when judging that the fan needs to stop according to the sampling voltage and the detected fan rotating speed.
In the fan stop control circuit, the control module is specifically configured to determine that the supply voltage is less than the preset supply voltage according to the sampling voltage, and when determining that the fan rotation speed is greater than the preset fan rotation speed, control the fan driving circuit to stop outputting a driving signal for driving the fan to rotate, and control the fan to stop.
In the fan shutdown control circuit, the power supply module comprises an EMI filtering unit and a PFC circuit unit, the EIM filtering unit is respectively connected with the PFC circuit unit and the voltage sampling module, and the PFC circuit unit is respectively connected with the voltage sampling module and the fan driving module;
the EIM filtering unit is used for filtering the alternating-current voltage and outputting an input voltage to the PFC circuit unit;
the PFC circuit unit is used for outputting bus voltage to the fan driving module after boosting the input voltage.
In the fan shutdown control circuit, the voltage sampling module comprises a first sampling unit and a second sampling unit, the first sampling unit is respectively connected with the EMI filtering unit and the control module, and the second sampling unit is respectively connected with the PFC circuit unit and the control module;
the first sampling unit is used for sampling the input voltage and outputting a first sampling voltage to the control module;
the second sampling unit is used for outputting a second sampling voltage value control module after sampling the bus voltage.
In the fan stop control circuit, the control module comprises a control chip which is respectively connected with the first sampling unit, the second sampling unit and the fan driving module;
the control chip is used for judging that the input voltage is smaller than a first preset voltage according to the first sampling voltage, judging that the bus voltage is smaller than a second preset voltage according to the second sampling voltage, and the speed of the bus voltage which is smaller than the reduction speed of the preset bus voltage, and controlling the fan driving circuit to stop outputting a driving signal for driving the fan to rotate when judging that the fan rotating speed is larger than the preset fan rotating speed, so as to control the fan to stop.
An air conditioner comprises the fan stop control circuit.
Compared with the prior art, the fan stop control method, the fan stop control circuit and the air conditioner provided by the invention have the advantages that: respectively detecting the power supply voltage and the rotating speed of the fan in real time; judging whether the fan is stopped or not according to the power supply voltage and the rotating speed of the fan; if yes, controlling the fan to stop. Therefore, the problems that the normal work of devices and the normal operation of an air conditioner are influenced due to the fact that the phase current is too high because the fan is out of step caused by the fact that the high-speed stop of the fan is caused by direct power failure are effectively solved.
Drawings
FIG. 1 is a flow chart of a method for controlling the shutdown of a wind turbine according to the present invention;
FIG. 2 is a schematic diagram of a fan shutdown control circuit provided by the present invention;
100: a power supply module; 200: a voltage sampling module; 300: a control module; 400: a fan drive module; 500, a step of; a compressor drive module; 110: an EMI filtering unit; 120: a PFC circuit unit; 130: a switching power supply unit; 210: a first sampling unit; 220: a second sampling unit; MCU: and a control chip.
Detailed Description
In view of the defects of the prior art, the invention aims to provide a fan halt control method, a control circuit and an air conditioner, which can effectively solve the problem that the normal work of devices and the normal operation of the air conditioner are influenced by the overhigh phase current caused by the fan desynchronizing due to the high-speed halt of the fan caused by the direct power failure.
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the method for controlling shutdown of a wind turbine according to the present invention includes the following steps:
s100, respectively detecting the power supply voltage and the rotating speed of the fan in real time;
s200, judging whether the fan is stopped or not according to the power supply voltage and the rotating speed of the fan;
and S300, if so, controlling the fan to stop.
In this embodiment, when the air conditioner is in operation, if the external power supply is directly powered off at this time, for example, if the power supply is directly unplugged, the power supply voltage in the power circuit in the air conditioner will change rapidly, and the rotation speed of the corresponding fan should also change, then it can be determined whether the external power supply is directly disconnected according to the power supply voltage and the rotation speed of the fan; when the change of the rotating speed of the fan is not enough to adapt to the change of the power supply voltage, step-out is easy to occur, so that one phase of current in three-phase current is increased rapidly, the fault protection of the fan is triggered, and frequent current impact is likely to cause the fan driving circuit to be damaged or influence other devices in the circuit to be damaged, so that the normal operation of the air conditioner is influenced; therefore, when the air conditioner needs to be shut down according to the power supply voltage and the rotating speed of the fan, the fan is immediately controlled to stop rotating, so that the problems that the fan is out of step due to the fact that the high rotating speed of the fan is shut down due to direct power failure, phase current is too high, and normal work of devices and normal operation of the air conditioner are affected are effectively avoided, and the safety of air conditioner operation is improved.
Further, in an embodiment of the present invention, the step S200 specifically includes: 210. and when the power supply voltage is less than the preset power supply voltage and the rotating speed of the fan is greater than the preset rotating speed of the fan, judging that the fan needs to be stopped.
During specific implementation, after the air conditioner is powered on and opened, various uncertain factors can exist to enable the air conditioner to be powered off accidentally and directly, so that the problem that the fan is out of step due to the fact that the fan is shut down at a high rotating speed after the air conditioner is powered off directly and the phase current is too high to affect normal work of devices and normal operation of the air conditioner is avoided, and then the power supply voltage and the rotating speed of the fan can be continuously detected after the air conditioner is powered on and opened, the states of the power supply voltage and the rotating speed of the fan are monitored constantly, and therefore the reliability of the air conditioner is improved.
In this embodiment, when the air conditioner is in operation, after the external power supply is directly cut off, the power supply voltage in the power supply circuit in the air conditioner will be rapidly reduced, and a certain time is required for the under-voltage reset of the main chip, and in this time, the main chip will still control the high-speed rotation of the fan according to the target wind speed because the main chip is not reset, so that if the power supply voltage is judged to be less than the preset voltage and the fan speed is greater than the preset fan speed, the direct power-down of the air conditioner can be determined; when the power supply voltage is not enough to support the running speed of the fan, step-out is easy to occur, so that a certain phase current in three-phase current is increased rapidly, fault protection of the fan is triggered, and frequent current impact is likely to cause damage of a fan driving circuit or influence damage of other devices in the circuit, so that normal running of the air conditioner is influenced; therefore, when the air conditioner is determined to be powered down directly, the fan is immediately controlled to stop rotating, so that the problems that the normal work of devices and the normal operation of the air conditioner are influenced by overhigh phase current due to the fact that the fan is out of step caused by high-speed shutdown of the fan due to direct power down are effectively solved, and the operation safety of the air conditioner is improved.
Further, step 210 includes: and when the input voltage is less than the first preset voltage, the bus voltage is less than the second preset voltage, and the reduction rate of the bus voltage is greater than the reduction rate of the preset bus voltage, the power supply voltage is less than the preset power supply voltage.
Specifically, the power supply voltage of the embodiment includes an input voltage and a bus voltage, and after the power supply is directly powered down, the input voltage is rapidly reduced, the corresponding bus voltage is rapidly dropped, and when the state of the power supply voltage is judged, the states of the input voltage and the bus voltage are also judged; in addition, because the PFC circuit comprises an electrolytic capacitor, after the power supply is powered off, the voltage stored in the electrolytic capacitor needs a certain time to be released, at this moment, the voltage reduction of a power supply module and a control module in the rear-end circuit needs a certain time, which is equivalent to the time needed by the undervoltage reset of the control module, and the control module still controls the fan to rotate according to the target rotating speed, so that the fan is in a high-speed running state; meanwhile, when the rotating speed of the fan is greater than the preset rotating speed of the fan, whether the external power supply is directly powered off or not can be accurately judged, and then preparation is made for whether the fan is controlled to stop rotating or not subsequently; the preset time in this embodiment is the actual power-down speed of the bus voltage when the power socket is unplugged during the test.
Further, step S300 includes: and stopping outputting a driving signal for driving the fan to rotate, and controlling the fan to stop.
According to the principle that the fan stop control circuit drives the fan to rotate in the embodiment: the control module outputs a driving signal to the fan driving module when the control module works normally, and then the fan driving module controls the fan to rotate at a certain rotating speed according to the driving signal; in actual operation, the fan is controlled to stop, namely the control module stops outputting the driving signal, so that the fan driving module stops driving the fan without driving the fan to rotate, and the working state of the fan is controlled.
Based on the fan shutdown control method, please refer to fig. 2, the present invention further provides a fan shutdown control circuit, where the fan control circuit includes: the power supply module 100 is respectively connected with the voltage sampling module 200, the fan driving module 400 and the compressor driving module 500, the fan driving module 400 is respectively connected with the control module 300 and a fan, and the compressor driving module 500 is also connected with the control module 300; the power supply module 100 is configured to provide a power supply voltage for the fan driving module 400 and the compressor driving module 500 according to the ac voltage; the voltage sampling module 200 is configured to sample the power supply voltage in real time and output the sampled voltage to the control module 300; the control module 300 is configured to control the fan to stop when the fan needs to stop according to the sampling voltage and the detected fan speed. Therefore, the circuit effectively avoids the problems that the normal work of devices and the normal operation of an air conditioner are influenced due to the fact that the phase current is too high because the fan is out of step caused by the fact that the fan is shut down at a high rotating speed due to direct power failure.
The control module 300 is specifically configured to determine that the power supply voltage is less than the preset power supply voltage according to the sampling voltage, and when determining that the fan rotation speed is greater than the preset fan rotation speed, control the fan driving circuit to stop outputting a driving signal for driving the fan to rotate, and control the fan to stop.
Further, the power supply module 100 includes an EMI filter unit 110, a PFC circuit unit 120, and a switching power supply unit 130, the EIM filter unit is respectively connected to the PFC circuit unit 120 and the voltage sampling module 200, and the PFC circuit unit 120 is respectively connected to the voltage sampling module 200, the fan driving module 400, and the switching power supply unit 130; the EIM filtering unit is used for filtering the alternating-current voltage and outputting an input voltage to the PFC circuit unit 120 to supply power to the PFC circuit unit 120; the PFC circuit unit 120 is configured to boost the input voltage and output a bus voltage to the fan driving module 400, so as to supply power to the fan driving module 400, and ensure that the fan driving module 400 can normally drive the fan to rotate when the fan driving module 400 normally works; the switching power supply unit 130 is configured to convert the bus voltage and supply power to the control module 300 and a load circuit, such as a four-way valve and an electronic expansion valve, to ensure normal operation of the control module 300.
Further, the voltage sampling module 200 includes a first sampling unit 210 and a second sampling unit 220, the first sampling unit 210 is connected to the EMI filter unit 110 and the control module 300, respectively, and the second sampling unit 220 is connected to the PFC circuit unit 120 and the control module 300, respectively; the first sampling unit 210 is configured to sample an input voltage and output a first sampled voltage to the control module 300; the second sampling unit 220 is configured to output a second sampling voltage to the control module 300 after sampling the bus voltage, so that the control module 300 detects the input voltage and the bus voltage in real time according to the first sampling voltage and the second sampling voltage.
Further, the control module 300 includes a control chip MCU, and the control chip MCU is respectively connected to the first sampling unit 210, the second sampling unit 220, and the fan driving module 400; the control chip MCU is used for judging that the input voltage is smaller than a first preset voltage according to the first sampling voltage, judging that the bus voltage is smaller than a second preset voltage according to the second sampling voltage, and judging that the rate of the smaller bus voltage is smaller than the reduction rate of the preset bus voltage, and when the rotating speed of the fan is larger than the preset rotating speed of the fan, controlling the fan driving circuit to stop outputting a driving signal for driving the fan to rotate, controlling the fan to stop, detecting the changes of the input voltage and the bus voltage in real time by the control chip MCU, and effectively avoiding that the normal work of a device and the normal operation of an air conditioner are influenced by overhigh phase current caused by the fan desynchronizing due to the fact that the fan is stopped at a high rotating speed due to direct power failure.
Further, in the present embodiment, the first sampling unit 210 includes a first sampling resistor R1 and a second sampling resistor R2, and the second sampling unit 220 includes a third sampling resistor R3 and a fourth sampling resistor R4; one end of the first sampling resistor R1 is connected with one ends of the control chip MCU and the second sampling resistor R2, the other end of the first sampling resistor R1 is grounded, the other end of the second sampling resistor R2 is connected with the output end of the EMI filtering unit 110, one end of the third sampling resistor R3 is connected with one ends of the control chip MCU and the fourth sampling resistor R4, the other end of the third sampling resistor R3 is grounded, and the other end of the fourth sampling resistor R4 is connected with the output end of the PFC circuit unit 120; the first sampling resistor R1 and the second sampling resistor R2 are used for dividing and sampling the input voltage and outputting the divided voltage to the control chip MCU, and the third sampling resistor R3 and the fourth sampling resistor R4 are used for sampling the bus voltage and outputting the sampled voltage to the control chip MCU, so that the real-time detection of the input voltage and the bus voltage is realized.
The invention also provides an air conditioner which comprises the fan stop control circuit, and the fan stop control circuit is not described in detail since the fan stop control circuit is described in detail above.
In summary, according to the fan stop control method, the control circuit and the air conditioner provided by the invention, the fan stop control method detects the power supply voltage and the fan rotating speed in real time respectively; judging whether the fan is stopped or not according to the power supply voltage and the rotating speed of the fan; if yes, controlling the fan to stop. Therefore, the problems that the normal work of devices and the normal operation of an air conditioner are influenced due to the fact that the phase current is too high because the fan is out of step caused by the fact that the high-speed stop of the fan is caused by direct power failure are effectively solved.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (4)
1. A fan shutdown control method is characterized by comprising the following steps:
respectively detecting the power supply voltage and the rotating speed of the fan in real time;
judging whether the fan is stopped or not according to the power supply voltage and the fan rotating speed;
if yes, controlling the fan to stop;
the step of judging whether the fan is stopped or not according to the power supply voltage and the fan rotating speed comprises the following steps of:
when the power supply voltage is less than a preset power supply voltage and the rotating speed of the fan is greater than a preset rotating speed of the fan, judging that the fan needs to be stopped;
the supply voltage comprises an input voltage and a bus voltage, and when the supply voltage is less than a preset supply voltage, the step of:
when the input voltage is smaller than a first preset voltage, the bus voltage is smaller than a second preset voltage, and the reduction rate of the bus voltage is greater than the reduction rate of the preset bus voltage, the power supply voltage is smaller than the preset power supply voltage;
the step of respectively detecting the power supply voltage and the rotating speed of the fan in real time comprises the following steps of:
the first sampling unit samples the input voltage and then outputs a first sampling voltage value control module, the second sampling unit samples the bus voltage and then outputs a second sampling voltage value control module, and the control module detects the input voltage and the bus voltage in real time according to the first sampling voltage and the second sampling voltage;
the first sampling unit comprises a first sampling resistor and a second sampling resistor, the second sampling unit comprises a third sampling resistor and a fourth sampling resistor, and the control module comprises a control chip; the one end connection control chip of first sampling resistance and the one end of second sampling resistance, the other end ground connection of first sampling resistance, the output of EMI filtering unit is connected to the other end of second sampling resistance, one section connection control chip of third sampling resistance with the one end of fourth sampling resistance, the other end ground connection of third sampling resistance, the output of PFC circuit is connected to the other end of fourth sampling resistance.
2. The fan shutdown control method according to claim 1, wherein the step of controlling the fan to be shutdown includes:
and stopping outputting a driving signal for driving the fan to rotate, and controlling the fan to stop.
3. A fan shutdown control circuit, comprising:
the fan driving device comprises a power supply module, a voltage sampling module, a control module and a fan driving module, wherein the power supply module is respectively connected with the voltage sampling module and the fan driving module, and the fan driving module is respectively connected with the control module and a fan;
the power supply module is used for providing power supply voltage for the fan driving module according to alternating current voltage;
the voltage sampling module is used for sampling the power supply voltage in real time and outputting a sampling voltage to the control module;
the control module is used for controlling the fan to stop when judging that the fan needs to stop according to the sampling voltage and the detected fan rotating speed;
the control module is specifically used for judging that the power supply voltage is smaller than a preset power supply voltage according to the sampling voltage, and controlling the fan driving circuit to stop outputting a driving signal for driving the fan to rotate when judging that the fan rotating speed is greater than a preset fan rotating speed, so as to control the fan to stop;
the power supply module comprises an EMI filtering unit and a PFC circuit unit, the EMI filtering unit is respectively connected with the PFC circuit unit and the voltage sampling module, and the PFC circuit unit is respectively connected with the voltage sampling module and the fan driving module;
the EMI filtering unit is used for filtering the alternating current voltage and outputting input voltage to the PFC circuit unit;
the PFC circuit unit is used for boosting the input voltage and then outputting a bus voltage to the fan driving module;
the voltage sampling module comprises a first sampling unit and a second sampling unit, the first sampling unit is respectively connected with the EMI filtering unit and the control module, and the second sampling unit is respectively connected with the PFC circuit unit and the control module;
the first sampling unit is used for sampling the input voltage and outputting a first sampling voltage to the control module;
the second sampling unit is used for outputting a second sampling voltage value after sampling the bus voltage and the control module;
the control module comprises a control chip which is respectively connected with the first sampling unit, the second sampling unit and the fan driving module; the fan control module comprises a fan control module and a fan control unit, wherein the fan control module comprises a fan control module, the fan control module and a fan control unit, the fan control module comprises a fan control unit, and the fan control unit comprises a first sampling resistor and a second sampling resistor; one end of the first sampling resistor is connected with one end of the control chip and one end of the second sampling resistor, the other end of the first sampling resistor is grounded, the other end of the second sampling resistor is connected with the output end of the EMI filtering unit, one section of the third sampling resistor is connected with one end of the control chip and one end of the fourth sampling resistor, the other end of the third sampling resistor is grounded, and the other end of the fourth sampling resistor is connected with the output end of the PFC circuit;
the control chip is used for judging that the input voltage is smaller than a first preset voltage according to the first sampling voltage, judging that the bus voltage is smaller than a second preset voltage according to the second sampling voltage, and judging that the reduction rate of the bus voltage is greater than the reduction rate of the preset bus voltage, and when judging that the rotating speed of the fan is greater than the rotating speed of the preset fan, controlling the fan driving circuit to stop outputting a driving signal for driving the fan to rotate, and controlling the fan to stop.
4. An air conditioner characterized by comprising the fan stop control circuit of claim 3.
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| CN202011156671.9A CN112283907B (en) | 2020-10-26 | 2020-10-26 | Fan shutdown control method and control circuit and air conditioner |
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101090253A (en) * | 2006-06-16 | 2007-12-19 | 乐金电子(天津)电器有限公司 | Control unit of air-conditioning compressor |
| JP2008141902A (en) * | 2006-12-05 | 2008-06-19 | Matsushita Electric Ind Co Ltd | Control unit for brushless dc motor and ventilation blower |
| JP2010246227A (en) * | 2009-04-03 | 2010-10-28 | Panasonic Corp | Inverter controller, electric compressor, and home electric appliance |
| CN105553250A (en) * | 2016-02-29 | 2016-05-04 | 广东志高空调有限公司 | Power factor correction circuit |
| CN105591584A (en) * | 2015-08-07 | 2016-05-18 | 青岛海信日立空调系统有限公司 | Air-conditioning fan control method and device |
| CN106026845A (en) * | 2016-06-21 | 2016-10-12 | 珠海格力电器股份有限公司 | Fan drive device, air-conditioning system and fan drive method of air-conditioning system |
| CN107990505A (en) * | 2017-12-21 | 2018-05-04 | 广东美的暖通设备有限公司 | Frequency conversion control circuit and air conditioner |
| CN109458695A (en) * | 2018-10-31 | 2019-03-12 | 奥克斯空调股份有限公司 | A kind of demagnetization guard method of power-off compressor and device |
| CN109613452A (en) * | 2018-11-29 | 2019-04-12 | 奥克斯空调股份有限公司 | The power-off protection method of AC power source power failure detection method, DC frequency-changeable compressor |
| CN110022099A (en) * | 2019-04-29 | 2019-07-16 | 青岛海信日立空调系统有限公司 | A kind of detection method and device of permanent magnet synchronous motor step-out |
| CN110567094A (en) * | 2019-09-17 | 2019-12-13 | 宁波奥克斯电气股份有限公司 | Control method and device for power-off protection of air conditioner system and air conditioner |
-
2020
- 2020-10-26 CN CN202011156671.9A patent/CN112283907B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101090253A (en) * | 2006-06-16 | 2007-12-19 | 乐金电子(天津)电器有限公司 | Control unit of air-conditioning compressor |
| JP2008141902A (en) * | 2006-12-05 | 2008-06-19 | Matsushita Electric Ind Co Ltd | Control unit for brushless dc motor and ventilation blower |
| JP2010246227A (en) * | 2009-04-03 | 2010-10-28 | Panasonic Corp | Inverter controller, electric compressor, and home electric appliance |
| CN105591584A (en) * | 2015-08-07 | 2016-05-18 | 青岛海信日立空调系统有限公司 | Air-conditioning fan control method and device |
| CN105553250A (en) * | 2016-02-29 | 2016-05-04 | 广东志高空调有限公司 | Power factor correction circuit |
| CN106026845A (en) * | 2016-06-21 | 2016-10-12 | 珠海格力电器股份有限公司 | Fan drive device, air-conditioning system and fan drive method of air-conditioning system |
| CN107990505A (en) * | 2017-12-21 | 2018-05-04 | 广东美的暖通设备有限公司 | Frequency conversion control circuit and air conditioner |
| CN109458695A (en) * | 2018-10-31 | 2019-03-12 | 奥克斯空调股份有限公司 | A kind of demagnetization guard method of power-off compressor and device |
| CN109613452A (en) * | 2018-11-29 | 2019-04-12 | 奥克斯空调股份有限公司 | The power-off protection method of AC power source power failure detection method, DC frequency-changeable compressor |
| CN110022099A (en) * | 2019-04-29 | 2019-07-16 | 青岛海信日立空调系统有限公司 | A kind of detection method and device of permanent magnet synchronous motor step-out |
| CN110567094A (en) * | 2019-09-17 | 2019-12-13 | 宁波奥克斯电气股份有限公司 | Control method and device for power-off protection of air conditioner system and air conditioner |
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