CN105914708B - For the net-fault stoppage protection circuit of fan and with its fan - Google Patents
For the net-fault stoppage protection circuit of fan and with its fan Download PDFInfo
- Publication number
- CN105914708B CN105914708B CN201610508623.9A CN201610508623A CN105914708B CN 105914708 B CN105914708 B CN 105914708B CN 201610508623 A CN201610508623 A CN 201610508623A CN 105914708 B CN105914708 B CN 105914708B
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- Prior art keywords
- circuit
- fan
- switch unit
- motor
- power source
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/12—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to undesired approach to, or touching of, live parts by living beings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
- H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
- H02P3/18—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor
- H02P3/24—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor by applying dc to the motor
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The invention discloses a kind of net-fault stoppage protection circuit for fan and with its fan; wherein, fan includes mesh enclosure and motor, and protection circuit includes: commutation circuit; the input terminal of commutation circuit is connected with AC power source, and the output end of commutation circuit is connected to the motor；Circuit occurs for touch signal, touches stopping signal to generate when mesh enclosure is touched；Zero cross detection circuit, zero cross detection circuit are connected to detect the voltage zero-crossing signal of AC power source with AC power source；Master controller; circuit occurs with commutation circuit, touch signal respectively for master controller and zero cross detection circuit is connected; master controller controls commutation circuit according to the voltage zero-crossing signal of AC power source when receiving touch stopping signal; to export direct current to motor, so that motor stalls by commutation circuit.The circuit when human or animal touches the mesh enclosure of fan, can control motor stopping in time, avoid damaging human or animal in fan motor operational process.
Description
Technical field
The present invention relates to field of home appliance technology, in particular to a kind of net-fault stoppage protection circuit and tool for fan
There is its fan.
Background technique
The net-fault stoppage protection of fan at present, is mainly realized by relay double-throw contact, i.e., when user touches wind
When the mesh enclosure of fan, the power supply of fan motor is switched to by alternating current by direct current by relay, so that motor is realized fastly
Speed braking, avoids harm to the human body.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
One purpose is to propose a kind of net-fault stoppage protection circuit for fan, when receiving touch stopping signal according to exchange
The voltage zero-crossing signal of power supply controls commutation circuit, to export direct current to motor by commutation circuit, keeps motor real
Existing quick shutdown, avoids damaging human or animal.
It is another object of the present invention to propose a kind of fan.
To achieve the above object, one aspect of the present invention embodiment proposes a kind of net-fault stoppage protection electricity for fan
Road, the fan include mesh enclosure and motor, and the net-fault stoppage protection circuit includes: commutation circuit, the commutation circuit it is defeated
Enter end to be connected with AC power source, the output end of the commutation circuit is connected with the motor；Circuit, the touching occur for touch signal
It touches signal generating circuit and touches stopping signal to generate when the mesh enclosure is touched；Zero cross detection circuit, the zero passage inspection
Slowdown monitoring circuit is connected to detect the voltage zero-crossing signal of the AC power source with the AC power source；And master controller, the master
Circuit occurs with the commutation circuit, the touch signal respectively for controller and the zero cross detection circuit is connected, the master control
Device processed when receiving the touch stopping signal according to the voltage zero-crossing signal of the AC power source to the commutation circuit into
Row control, to export direct current to the motor, so that the motor stalls by the commutation circuit.
Net-fault stoppage protection circuit according to an embodiment of the present invention for fan, the input terminal and alternating current of commutation circuit
Source is connected, and the output end of commutation circuit is connected to the motor, and touch signal occurs circuit and touches to generate when mesh enclosure is touched
Stopping signal, master controller is when receiving touch stopping signal, according to the voltage of the AC power source of zero cross detection circuit detection
Zero cross signal controls commutation circuit, to make motor realize quick shutdown by commutation circuit output direct current to motor,
It avoids damaging human or animal, improves the safety of fan.
According to one embodiment of present invention, the master controller passes through control when not receiving the touch stopping signal
It makes the commutation circuit and exports alternating current to the motor, so that the motor runs well.
According to one embodiment of present invention, the commutation circuit includes: first to fourth switch unit, first switch list
One end of member and one end of second switch unit are connected after being connected with one end of the AC power source, one end of third switch unit
It is connected after being connected with one end of the 4th switch unit with the other end of the AC power source, the other end of the first switch unit
It is connected after being connected with the other end of the third switch unit with one end of the motor, the other end of the second switch unit
It is connected after being connected with the other end of the 4th switch unit with the other end of the motor, first to fourth switch unit
Control terminal be connected respectively with the master controller.
According to one embodiment of present invention, the circuit structure phase of the first switch unit and the second switch unit
Together, the first switch unit includes: first switch tube, one end of the first end of the first switch tube and the AC power source
It is connected, the second end of the first switch tube is connected with one end of the motor；First photoelectrical coupler, the first photoelectricity coupling
The first end of clutch is connected by first resistor with the first end of the first switch tube, and the second of first photoelectrical coupler
End is connected with the control terminal of the first switch tube, and the third end of first photoelectrical coupler is connected with the first default power supply,
4th end of first photoelectrical coupler is connected by second resistance with the master controller.
According to one embodiment of present invention, the circuit structure phase of the third switch unit and the 4th switch unit
Together, the third switch unit includes: second switch, and the first end of the second switch is another with the AC power source
End is connected, and the second end of the second switch is connected with the other end of the motor, and the control terminal of the second switch is logical
3rd resistor is crossed to be connected with the master controller.
Further, the first switch tube and second switch are silicon-controlled.
According to one embodiment of present invention, the zero cross detection circuit includes: diode, the diode anode with
One end of the AC power source is connected；Triode, the base stage of the third pole pipe are negative by the 4th resistance and the diode
Extremely be connected, the collector of the triode is connected by the 5th resistance with the first default power supply, and pass through the 6th resistance with it is described
Master controller is connected, the emitter ground connection of the triode；7th resistance, the 7th resistance are connected to the base of the triode
Between pole and emitter.
According to one embodiment of present invention, the master controller is controlled according to the voltage zero-crossing signal of the AC power source
The switching sequence of first to fourth switch unit is so that the alternating current that the commutation circuit exports the AC power source turns
It is changed to the direct current.
In addition, the embodiment of the present invention also proposed a kind of fan comprising the above-mentioned net-fault for fan, which is shut down, protects
Protection circuit.
The fan of the embodiment of the present invention is touched by the above-mentioned net-fault stoppage protection circuit for fan receiving
When stopping signal, commutation circuit can be controlled according to the voltage zero-crossing signal of AC power source, with defeated by commutation circuit
Direct current makes motor realize quick shutdown, avoids damaging human or animal, improve the safety of fan to motor out.
Detailed description of the invention
Fig. 1 is the block diagram of the net-fault stoppage protection circuit according to an embodiment of the present invention for fan.
Fig. 2 is the structural schematic diagram of the net-fault stoppage protection circuit according to an embodiment of the invention for fan.
Fig. 3 is the switching sequence figure of first to fourth switch unit in commutation circuit according to an embodiment of the invention.
Fig. 4 is the net-fault stoppage protection circuit diagram according to an embodiment of the invention for fan.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
Below with reference to the accompanying drawings come describe the net-fault stoppage protection circuit proposed according to embodiments of the present invention for fan and
With its fan.
Fig. 1 is the block diagram of the net-fault stoppage protection circuit according to an embodiment of the present invention for fan, wherein wind
Fan includes mesh enclosure and motor.
As shown in Figure 1, the net-fault stoppage protection circuit for being used for fan includes commutation circuit 10, touch signal generation circuit
20, zero cross detection circuit 30 and master controller 40.
Wherein, the input terminal of commutation circuit 10 is connected with AC power source (AB), output end and the motor M phase of commutation circuit 10
Even.Touch signal occurs circuit 20 and touches stopping signal to generate when mesh enclosure is touched.Zero cross detection circuit 30 with exchange
Power supply is connected to detect the voltage zero-crossing signal of AC power source.Master controller 40 occurs with commutation circuit 10, touch signal respectively
Circuit 20 is connected with zero cross detection circuit 30, and master controller 40 is when receiving touch stopping signal according to the voltage of AC power source
Zero cross signal controls commutation circuit 10, to export direct current to motor M, so that motor M is stalled by commutation circuit 10.
In an embodiment of the present invention, master controller 40 passes through control commutation circuit when not receiving and touching stopping signal
10 output alternating currents are to motor M, so that motor M runs well.
Specifically, fan is in normal work, master controller 40 exports alternating current to electricity by control commutation circuit 10
Machine M, so that motor M runs well.And in fan course of normal operation, if net-fault condition occurs, such as someone or dynamic
When object touches the mesh enclosure of fan, circuit 20, which occurs, for corresponding touch signal can generate touch stopping signal, and be sent to master control
Device 40 processed, master controller 40 receive touch stopping signal after, by with any one input line in AC power source input line
Connected zero cross detection circuit 30 detects the voltage zero-crossing signal of AC power source, and according to the voltage zero-crossing signal control of AC power source
Commutation circuit 10 processed exports direct current and effectively prevent human or animal to be injured so that motor M realizes fast braking to motor M.
According to one embodiment of present invention, as shown in Fig. 2, commutation circuit 10 includes: first to fourth switch unit, the
One end of one switch unit K1 and one end of second switch unit K2 are connected after being connected with one end of AC power source, and third switch is single
One end of first K3 and one end of the 4th switch unit K4 are connected after being connected with the other end of AC power source, first switch unit K1's
The other end of the other end and third switch unit K3 are connected after being connected with one end of motor M, the other end of second switch unit K2
It is connected after being connected with the other end of the 4th switch unit K4 with the other end of motor M, the control terminal of first to fourth switch unit
It is connected respectively with master controller 40.
Master controller 40 controls the switching sequence of first to fourth switch unit according to the voltage zero-crossing signal of AC power source
So that the alternating current that AC power source exports is converted to direct current by commutation circuit 10.
Specifically, as shown in Fig. 2, master controller 40 controls first in commutation circuit 10 when fan works normally
Switch unit K1 and the 4th switch unit K4 are both turned on, and control second switch unit K2 and third switch unit K3 is disconnected,
AC power source is directly inputted into motor M at this time, and motor M runs well.And when net-fault condition occurs, circuit occurs for touch signal
20 generate touch stopping signal and are sent to master controller 40, and master controller 40 first controls after receiving touch stopping signal
First switch unit K1 and the 4th switch unit K4 are disconnected, and then wait the voltage zero-crossing signal of AC power source.Such as Fig. 3 institute
Show, when the voltage zero-crossing signal VDD for detecting AC power source is turned to 1 by 0, master controller 40 controls second switch unit K2
It is both turned on third switch unit K3, and first switch unit K1 and the 4th switch unit K4 are in an off state, when detecting
When the voltage zero-crossing signal VDD of AC power source is turned to 0 by 1, master controller 40 controls second switch unit K2 and third switch
Unit K3 is disconnected, and controls first switch unit K1 and the 4th switch unit K4 conducting, is circuited sequentially, until motor M stops
Operating, first to fourth switch unit of control disconnect, realize the fast braking of motor, prevent human or animal from coming to harm.
It is understood that in an embodiment of the present invention, when fan works normally, master controller 40 also be can control
Second switch unit K2 and third switch unit K3 are both turned on, so that AC power source is input to motor M, motor M runs well, and
When receiving touch stopping signal, the switching sequence of first to fourth switch unit is controlled so as to change according to voltage zero-crossing signal
The alternating current that AC power source exports is converted to direct current by circuitry phase 10, and I will not elaborate for specific control process.
In an embodiment of the present invention, first switch unit K1 to the 4th switch unit K4 can be silicon-controlled, metal-oxide-semiconductor,
High-voltage three-pole pipe or photoelectrical coupler etc..
Specifically, according to one embodiment of present invention, as shown in figure 4, first switch unit K1 and second switch unit
The circuit structure of K2 is identical.First switch unit K1 include first switch tube T1, the first photoelectrical coupler U1, first resistor R1 and
Second resistance R2, wherein the first end of first switch tube T1 is connected with one end A of AC power source, and the second of first switch tube T1
End is connected with one end of motor M, and the first end of the first photoelectrical coupler U1 passes through the of first resistor R1 and first switch tube T1
One end is connected, and the second end of the first photoelectrical coupler U1 is connected with the control terminal of first switch tube T1, the first photoelectrical coupler U1
Third end be connected with the first default power supply VCC1 (voltage can be+5V), the 4th end of the first photoelectrical coupler U1 passes through second
Resistance R2 is connected with master controller 40, and first switch tube T1 can be silicon-controlled.
As shown in figure 4, the circuit structure of third switch unit K3 and the 4th switch unit K4 are identical, third switch unit K3
Including second switch T2 and 3rd resistor R3, wherein the other end B phase of the first end of second switch T2 and AC power source
Even, the second end of second switch T2 is connected with the other end of motor M, and the control terminal of second switch T2 passes through 3rd resistor R3
It is connected with master controller 40, second switch T2 can be silicon-controlled.
According to one embodiment of present invention, as shown in figure 4, zero cross detection circuit may include: diode D1, triode
Q1, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and the 7th resistance R7, wherein the anode and AC power source of diode D1
One end of A is connected, and the base stage of third pole pipe Q1 is connected by the 4th resistance R4 with the cathode of diode D1, the current collection of triode Q1
Pole is connected by the 5th resistance R5 with the first default power supply VCC1, and is connected by the 6th resistance R6 with master controller 40, three poles
The emitter of pipe Q1 is grounded GND, and the 7th resistance R7 is connected between the base stage and emitter of triode Q1.Concrete operating principle this
In be no longer described in detail.
Net-fault stoppage protection circuit according to an embodiment of the present invention for fan, the input terminal and alternating current of commutation circuit
Source is connected, and the output end of commutation circuit is connected to the motor, and touch signal occurs circuit and touches to generate when mesh enclosure is touched
Stopping signal, master controller is when receiving touch stopping signal, according to the voltage of the AC power source of zero cross detection circuit detection
Zero cross signal controls commutation circuit, to make motor realize quick shutdown by commutation circuit output direct current to motor,
It avoids damaging human or animal, improves the safety of fan.
In addition, the embodiment of the present invention also proposed a kind of fan comprising the above-mentioned net-fault for fan, which is shut down, protects
Protection circuit.
The fan of the embodiment of the present invention is touched by the above-mentioned net-fault stoppage protection circuit for fan receiving
When stopping signal, commutation circuit can be controlled according to the voltage zero-crossing signal of AC power source, with defeated by commutation circuit
Direct current makes motor realize quick shutdown, avoids damaging human or animal, improve the safety of fan to motor out.
In the description of the present invention, term " first ", " second " are used for description purposes only, and should not be understood as instruction or dark
Show relative importance or implicitly indicates the quantity of indicated technical characteristic.The feature of " first ", " second " is defined as a result,
It can explicitly or implicitly include at least one of the features.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (8)
1. a kind of net-fault stoppage protection circuit for fan, which is characterized in that the fan includes mesh enclosure and motor, the touching
Net stoppage protection circuit includes:
The input terminal of commutation circuit, the commutation circuit is connected with AC power source, the output end of the commutation circuit and the electricity
Machine is connected；
Circuit occurs for touch signal, and the touch signal occurs circuit and shuts down letter to generate to touch when the mesh enclosure is touched
Number；
Zero cross detection circuit, the zero cross detection circuit are connected to detect the voltage mistake of the AC power source with the AC power source
Zero-signal；And
Master controller, circuit occurs with the commutation circuit, the touch signal respectively for the master controller and the zero passage is examined
Slowdown monitoring circuit is connected, and the master controller is believed when receiving the touch stopping signal according to the voltage zero-cross of the AC power source
Number the commutation circuit is controlled, to export direct current to the motor, so that the motor by the commutation circuit
Stalling；
Wherein, the commutation circuit includes: first to fourth switch unit, one end of first switch unit and second switch unit
One end be connected after be connected with one end of the AC power source, one end phase of one end of third switch unit and the 4th switch unit
The other end of AC power source described in Lian Houyu is connected, the other end of the first switch unit and the third switch unit it is another
One end is connected after being connected with one end of the motor, the other end of the second switch unit and the 4th switch unit it is another
One end be connected after is connected with the other end of the motor, the control terminal of first to fourth switch unit respectively with the master control
Device processed is connected.
2. being used for the net-fault stoppage protection circuit of fan as described in claim 1, which is characterized in that the master controller is not
Alternating current is exported to the motor, so that the motor by controlling the commutation circuit when receiving the touch stopping signal
It runs well.
3. being used for the net-fault stoppage protection circuit of fan as described in claim 1, which is characterized in that the first switch unit
Identical with the circuit structure of the second switch unit, the first switch unit includes:
First switch tube, the first end of the first switch tube are connected with one end of the AC power source, the first switch tube
Second end be connected with one end of the motor；
First photoelectrical coupler, the first end of first photoelectrical coupler pass through first resistor and the first switch tube the
One end is connected, and the second end of first photoelectrical coupler is connected with the control terminal of the first switch tube, first photoelectricity
The third end of coupler is connected with the first default power supply, the 4th end of first photoelectrical coupler by second resistance with it is described
Master controller is connected.
4. being used for the net-fault stoppage protection circuit of fan as claimed in claim 3, which is characterized in that the third switch unit
Identical with the circuit structure of the 4th switch unit, the third switch unit includes:
Second switch, the first end of the second switch are connected with the other end of the AC power source, the second switch
The second end of pipe is connected with the other end of the motor, and the control terminal of the second switch passes through 3rd resistor and the master control
Device processed is connected.
5. as claimed in claim 4 be used for fan net-fault stoppage protection circuit, which is characterized in that the first switch tube and
Second switch is silicon-controlled.
6. being used for the net-fault stoppage protection circuit of fan as described in claim 1, which is characterized in that the zero cross detection circuit
Include:
The anode of diode, the diode is connected with one end of the AC power source；
The base stage of triode, the triode is connected by the 4th resistance with the cathode of the diode, the collection of the triode
Electrode is connected by the 5th resistance with the first default power supply, and is connected by the 6th resistance with the master controller, three pole
The emitter of pipe is grounded；
7th resistance, the 7th resistance are connected between the base stage and emitter of the triode.
7. as described in claim 1 be used for fan net-fault stoppage protection circuit, which is characterized in that the master controller according to
The voltage zero-crossing signal of the AC power source controls the switching sequence of first to fourth switch unit so that the commutation is electric
The alternating current that the AC power source exports is converted to the direct current by road.
8. a kind of fan, which is characterized in that shut down and protect including the net-fault such as of any of claims 1-7 for fan
Protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610508623.9A CN105914708B (en) | 2016-06-29 | 2016-06-29 | For the net-fault stoppage protection circuit of fan and with its fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610508623.9A CN105914708B (en) | 2016-06-29 | 2016-06-29 | For the net-fault stoppage protection circuit of fan and with its fan |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105914708A CN105914708A (en) | 2016-08-31 |
| CN105914708B true CN105914708B (en) | 2019-08-27 |
Family
ID=56753711
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610508623.9A Active CN105914708B (en) | 2016-06-29 | 2016-06-29 | For the net-fault stoppage protection circuit of fan and with its fan |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0449687A1 (en) * | 1990-03-26 | 1991-10-02 | Automobiles Peugeot | Control process of a self-piloted synchronous motor and device for using the same |
| CN2814802Y (en) * | 2005-06-27 | 2006-09-06 | 广东科龙电器股份有限公司 | Air conditioner fan motor stepless speed regulating device |
| KR20090022442A (en) * | 2007-08-30 | 2009-03-04 | 장영준 | Safe fan |
| CN102758783A (en) * | 2011-04-26 | 2012-10-31 | 郭炜斌 | Finger touch protection fan |
| CN202597145U (en) * | 2011-12-28 | 2012-12-12 | 李国强 | Finger touch protection device for electric fan |
| CN205863893U (en) * | 2016-06-29 | 2017-01-04 | 广东美的环境电器制造有限公司 | For the net-fault stoppage protection circuit of fan and the fan with it |
-
2016
- 2016-06-29 CN CN201610508623.9A patent/CN105914708B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0449687A1 (en) * | 1990-03-26 | 1991-10-02 | Automobiles Peugeot | Control process of a self-piloted synchronous motor and device for using the same |
| CN2814802Y (en) * | 2005-06-27 | 2006-09-06 | 广东科龙电器股份有限公司 | Air conditioner fan motor stepless speed regulating device |
| KR20090022442A (en) * | 2007-08-30 | 2009-03-04 | 장영준 | Safe fan |
| CN102758783A (en) * | 2011-04-26 | 2012-10-31 | 郭炜斌 | Finger touch protection fan |
| CN202597145U (en) * | 2011-12-28 | 2012-12-12 | 李国强 | Finger touch protection device for electric fan |
| CN205863893U (en) * | 2016-06-29 | 2017-01-04 | 广东美的环境电器制造有限公司 | For the net-fault stoppage protection circuit of fan and the fan with it |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105914708A (en) | 2016-08-31 |
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