CN105914708A - Net-touching shutdown protection circuit used for fan and fan equipped with same - Google Patents
Net-touching shutdown protection circuit used for fan and fan equipped with same Download PDFInfo
- Publication number
- CN105914708A CN105914708A CN201610508623.9A CN201610508623A CN105914708A CN 105914708 A CN105914708 A CN 105914708A CN 201610508623 A CN201610508623 A CN 201610508623A CN 105914708 A CN105914708 A CN 105914708A
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- Prior art keywords
- fan
- circuit
- power supply
- alternating current
- net
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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 net-touching shutdown protection circuit used for a fan and the fan equipped with the same. The fan comprises a net cover and a motor; the protection circuit comprises a phase-commutating circuit, a touch signal generation circuit, a zero-cross detection circuit and a main controller, wherein the input end of the phase-commutating circuit is connected with an alternating current power supply while the output end of the phase-commutating circuit is connected with the motor; the touch signal generation circuit is used for generating a touch shutdown signal when the net cover is touched; the zero-cross detection circuit is connected with the alternating current power supply for detecting the voltage zero-cross signal of the alternating current power supply; the main controller is connected with the phase-commutating circuit, the touch signal generation circuit and the zero-cross detection circuit separately; and when the main controller receives the touch shutdown signal, the main controller controls the phase-commutating circuit according to the voltage zero-cross signal of the alternating current power supply to output direct current to the motor through the phase-commutating circuit so as to enable the motor to be stopped. By adoption of the net-touching shutdown protection circuit, when the net cover of the fan is touched by a person or an animal in the running process of the motor of the fan, the motor can be controlled to be stopped in time so as to avoid injury to the person or the animal.
Description
Technical field
The present invention relates to household electrical appliance technical field, particularly to a kind of net-fault stoppage protection circuit for fan and there is it
Fan.
Background technology
The net-fault stoppage protection of fan at present, is mainly realized by relay double-throw contact, i.e. touches fan as user
During guard, by relay, the power supply of fan electromotor is switched to unidirectional current by alternating current, so that motor realizes quickly system
Dynamic, it is to avoid human body is damaged.
Summary of the invention
It is contemplated that one of technical problem solved the most to a certain extent in correlation technique.To this end, the one of the present invention
Purpose is to propose a kind of net-fault stoppage protection circuit for fan, when receiving touch stopping signal according to alternating current power supply
Voltage zero-crossing signal commutation circuit is controlled, with by commutation circuit output unidirectional current to motor, make motor realize fast
Speed is shut down, it is to avoid damage human or animal.
Further object is that a kind of fan of proposition.
For achieving the above object, one aspect of the present invention embodiment proposes a kind of net-fault stoppage protection circuit for fan, institute
State fan and include that guard and motor, described net-fault stoppage protection circuit include: commutation circuit, the input of described commutation circuit
Being connected with alternating current power supply, the outfan of described commutation circuit is connected with described motor；Touch signal generation circuit, described touch
Signal generating circuit touches stopping signal in order to generate when described guard is touched；Zero cross detection circuit, described zero passage detection
Circuit be connected with described alternating current power supply with detect described alternating current power supply voltage zero-crossing signal；And master controller, described master control
Device processed is connected with described commutation circuit, described touch signal generation circuit and described zero cross detection circuit respectively, described main control
Described commutation circuit is controlled by device voltage zero-crossing signal according to described alternating current power supply when receiving described touch stopping signal
System, to export unidirectional current extremely described motor by described commutation circuit, so that described motor stalling.
The net-fault stoppage protection circuit for fan according to embodiments of the present invention, the input of commutation circuit and alternating current power supply phase
Even, the outfan of commutation circuit is connected with motor, and touch signal generation circuit is shut down in order to generate when guard is touched to touch
Signal, master controller is when receiving touch stopping signal, according to the voltage zero-cross of the alternating current power supply of zero cross detection circuit detection
Commutation circuit is controlled by signal, with by commutation circuit output unidirectional current to motor, make motor realize quick shutdown, keep away
Exempt from human or animal is damaged, improve the safety of fan.
According to one embodiment of present invention, described master controller when not receiving described touch stopping signal by control institute
State commutation circuit output AC electricity extremely described motor, so that described motor runs well.
According to one embodiment of present invention, described commutation circuit includes: first to fourth switch element, the first switch element
One end be connected with one end of second switch unit after be connected with one end of described alternating current power supply, one end of the 3rd switch element and
One end of 4th switch element be connected after be connected with the other end of described alternating current power supply, the other end of described first switch element with
The other end of described 3rd switch element be connected after be connected with one end of described motor, the other end of described second switch unit with
The other end of described 4th switch element is connected with the other end of described motor after being connected, described first to fourth switch element
Control end to be connected with described master controller respectively.
According to one embodiment of present invention, described first switch element is identical with the circuit structure of described second switch unit,
Described first switch element includes: the first switching tube, the first end of described first switching tube and one end phase of described alternating current power supply
Even, the second end of described first switching tube is connected with one end of described motor；First photoelectrical coupler, described first smooth thermocouple
First end of clutch is connected with the first end of described first switching tube by the first resistance, the second of described first photoelectrical coupler
End is connected with the control end of described first switching tube, and the 3rd end and first of described first photoelectrical coupler is preset power supply and is connected,
4th end of described first photoelectrical coupler is connected with described master controller by the second resistance.
According to one embodiment of present invention, described 3rd switch element is identical with the circuit structure of described 4th switch element,
Described 3rd switch element includes: second switch pipe, the first end of described second switch pipe and the other end of described alternating current power supply
Being connected, the second end of described second switch pipe is connected with the other end of described motor, and the control end of described second switch pipe passes through
3rd resistance is connected with described master controller.
Further, described first switching tube and second switch pipe are controllable silicon.
According to one embodiment of present invention, described zero cross detection circuit includes: diode, the positive pole of described diode and institute
The one end stating alternating current power supply is connected；Audion, the base stage of described audion is by the negative pole of the 4th resistance with described diode
Being connected, the colelctor electrode of described audion is preset power supply by the 5th resistance and first and is connected, and by the 6th resistance and described master
Controller is connected, the grounded emitter of described audion；7th resistance, described 7th resistance is connected to the base of described audion
Between pole and emitter stage.
According to one embodiment of present invention, described master controller controls described according to the voltage zero-crossing signal of described alternating current power supply
The switching sequence of first to fourth switch element is so that the alternating current that described alternating current power supply exports is converted to institute by described commutation circuit
State unidirectional current.
Additionally, embodiments of the invention also proposed a kind of fan, it includes the above-mentioned net-fault stoppage protection electricity for fan
Road.
The fan of the embodiment of the present invention, by the above-mentioned net-fault stoppage protection circuit for fan, shuts down receiving touch
During signal, it is possible to according to the voltage zero-crossing signal of alternating current power supply, commutation circuit is controlled, with straight by commutation circuit output
Stream electricity, to motor, makes motor realize quick shutdown, it is to avoid to damage human or animal, improves the safety of fan.
Accompanying drawing explanation
Fig. 1 is the block diagram of the net-fault stoppage protection circuit for fan according to embodiments of the present invention.
Fig. 2 is according to an embodiment of the invention for the structural representation of net-fault stoppage protection circuit of fan.
Fig. 3 is the switching sequence figure of first to fourth switch element in commutation circuit according to an embodiment of the invention.
Fig. 4 is according to an embodiment of the invention for the net-fault stoppage protection circuit diagram of fan.
Detailed description of the invention
Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings, the most identical
Or similar label represents same or similar element or has the element of same or like function.Retouch below with reference to accompanying drawing
The embodiment stated is exemplary, it is intended to is used for explaining the present invention, and is not considered as limiting the invention.
Below with reference to the accompanying drawings describe the net-fault stoppage protection circuit for fan proposed according to embodiments of the present invention and there is it
Fan.
Fig. 1 is the block diagram of the net-fault stoppage protection circuit for fan according to embodiments of the present invention, wherein, fan
Including guard and motor.
As it is shown in figure 1, this net-fault stoppage protection circuit being used for fan include commutation circuit 10, touch signal generation circuit 20,
Zero cross detection circuit 30 and master controller 40.
Wherein, the input of commutation circuit 10 is connected with alternating current power supply (AB), the outfan of commutation circuit 10 and motor M
It is connected.Touch signal generation circuit 20 touches stopping signal in order to generate when guard is touched.Zero cross detection circuit 30 with
Alternating current power supply is connected to detect the voltage zero-crossing signal of alternating current power supply.Master controller 40 is believed with commutation circuit 10, touch respectively
Number occur circuit 20 be connected with zero cross detection circuit 30, master controller 40 receive touch stopping signal time according to alternating current
Commutation circuit 10 is controlled by the voltage zero-crossing signal in source, to export unidirectional current to motor M by commutation circuit 10, with
Make motor M stall.
In an embodiment of the present invention, master controller 40 do not receive touch stopping signal time by control commutation circuit 10
Output AC electricity is to motor M, so that motor M runs well.
Specifically, fan is when normally working, and master controller 40 is electric to motor M by controlling commutation circuit 10 output AC,
So that motor M runs well.And in fan course of normal operation, if net-fault condition occurs, such as, have people or animal
When touching the guard of fan, corresponding touch signal generation circuit 20 can generate touch stopping signal, and sends to main control
Device 40, master controller 40 receive touch stopping signal after, by with any one input line in alternating current power supply input line
The zero cross detection circuit 30 being connected detects the voltage zero-crossing signal of alternating current power supply, and according to the voltage zero-crossing signal control of alternating current power supply
Commutation circuit 10 processed exports unidirectional current to motor M, so that motor M realizes fast braking, effectively prevents human or animal from being injured.
According to one embodiment of present invention, as in figure 2 it is shown, commutation circuit 10 includes: first to fourth switch element, the
One end of one switch element K1 is connected with one end of alternating current power supply after being connected with one end of second switch unit K2, the 3rd switch
One end of unit K3 is connected with the other end of alternating current power supply after being connected with one end of the 4th switch element K4, the first switch element
The other end of K1 and the other end of the 3rd switch element K3 are connected with one end of motor M after being connected, second switch unit K2's
The other end of the other end and the 4th switch element K4 is connected with the other end of motor M after being connected, first to fourth switch element
Control end to be connected with master controller 40 respectively.
Master controller 40 controls the switching sequence of first to fourth switch element according to the voltage zero-crossing signal of alternating current power supply so that changing
The alternating current that alternating current power supply exports is converted to unidirectional current by circuitry phase 10.
Specifically, as in figure 2 it is shown, when fan normally works, master controller 40 controls first in commutation circuit 10
Switch element K1 and the 4th switch element K4 is both turned on, and it is the most disconnected to control second switch unit K2 and the 3rd switch element K3
Opening, now alternating current power supply is directly inputted into motor M, motor M normal operation.And when net-fault condition occurs, touch signal
Occurring circuit 20 to generate touch stopping signal and send to master controller 40, master controller 40 is receiving touch stopping signal
After, first control the first switch element K1 and the 4th switch element K4 and all disconnect, then wait the voltage zero-cross letter of alternating current power supply
Number.As it is shown on figure 3, when voltage zero-crossing signal VDD alternating current power supply being detected is turned to 1 by 0, master controller 40 is controlled
Second switch unit K2 and the 3rd switch element K3 processed is both turned on, and at the first switch element K1 and the 4th switch element K4
In off-state, when voltage zero-crossing signal VDD alternating current power supply being detected is turned to 0 by 1, master controller 40 controls
Two switch element K2 and the 3rd switch element K3 all disconnect, and control the first switch element K1 and the 4th switch element K4 and lead
Logical, circulate successively, until motor M shuts down, control first to fourth switch element and all disconnect, it is achieved motor quick
Braking, prevents human or animal from coming to harm.
It is understood that in an embodiment of the present invention, when fan normally works, master controller 40 can also control
Two switch element K2 and the 3rd switch element K3 are both turned on, so that alternating current power supply input runs well to motor M, motor M,
And receive touch stopping signal time, according to voltage zero-crossing signal control first to fourth switch element switching sequence so that
The alternating current that alternating current power supply exports is converted to unidirectional current by commutation circuit 10, and I will not elaborate for concrete control process.
In an embodiment of the present invention, the first switch element K1 to the 4th switch element K4 can be controllable silicon, metal-oxide-semiconductor, height
Pressure audion or photoelectrical coupler etc..
Specifically, according to one embodiment of present invention, as shown in Figure 4, the first switch element K1 and second switch unit K2
Circuit structure identical.First switch element K1 includes first switch transistor T the 1, first photoelectrical coupler U1, the first resistance R1
With the second resistance R2, wherein, the first end of the first switch transistor T 1 is connected with one end A of alternating current power supply, the first switch transistor T 1
The second end be connected with one end of motor M, first end of the first photoelectrical coupler U1 by the first resistance R1 with first switch
First end of pipe T1 is connected, and second end of the first photoelectrical coupler U1 and the control end of the first switch transistor T 1 are connected, the first light
3rd end of electric coupler U1 and first is preset power supply VCC1 (voltage can be+5V) and is connected, the first photoelectrical coupler U1's
4th end is connected with master controller 40 by the second resistance R2, and the first switch transistor T 1 can be controllable silicon.
As shown in Figure 4, the circuit structure of the 3rd switch element K3 and the 4th switch element K4 is identical, the 3rd switch element K3
Including second switch pipe T2 and the 3rd resistance R3, wherein, first end of second switch pipe T2 and the other end B of alternating current power supply
Being connected, second end of second switch pipe T2 is connected with the other end of motor M, and the control end of second switch pipe T2 passes through the 3rd
Resistance R3 is connected with master controller 40, and second switch pipe T2 can be controllable silicon.
According to one embodiment of present invention, as shown in Figure 4, zero cross detection circuit may include that diode D1, audion
Q1, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and the 7th resistance R7, wherein, the positive pole of diode D1 with
One end of alternating current power supply A is connected, and the base stage of audion Q1 is connected by the negative pole of the 4th resistance R4 and diode D1, and three
The colelctor electrode of pole pipe Q1 is preset power supply VCC1 by the 5th resistance R5 and first and is connected, and by the 6th resistance R6 and master control
Device 40 processed is connected, and the grounded emitter GND of audion Q1, the 7th resistance R7 are connected to base stage and the transmitting of audion Q1
Between pole.I will not elaborate for specific works principle.
The net-fault stoppage protection circuit for fan according to embodiments of the present invention, the input of commutation circuit and alternating current power supply phase
Even, the outfan of commutation circuit is connected with motor, and touch signal generation circuit is shut down in order to generate when guard is touched to touch
Signal, master controller is when receiving touch stopping signal, according to the voltage zero-cross of the alternating current power supply of zero cross detection circuit detection
Commutation circuit is controlled by signal, with by commutation circuit output unidirectional current to motor, make motor realize quick shutdown, keep away
Exempt from human or animal is damaged, improve the safety of fan.
Additionally, embodiments of the invention also proposed a kind of fan, it includes the above-mentioned net-fault stoppage protection electricity for fan
Road.
The fan of the embodiment of the present invention, by the above-mentioned net-fault stoppage protection circuit for fan, shuts down receiving touch
During signal, it is possible to according to the voltage zero-crossing signal of alternating current power supply, commutation circuit is controlled, with straight by commutation circuit output
Stream electricity, to motor, makes motor realize quick shutdown, it is to avoid to damage human or animal, improves the safety of fan.
In describing the invention, term " first ", " second " are only used for describing purpose, and it is not intended that indicate or dark
Show relative importance or the implicit quantity indicating indicated technical characteristic.Thus, " first ", " second " are defined
Feature can express or implicitly include at least one this feature.
In the present invention, unless otherwise clearly defined and limited, term " install ", " being connected ", " connection ", " fixing "
Should be interpreted broadly Deng term, connect for example, it may be fixing, it is also possible to be to removably connect, or integral；Can be
It is mechanically connected, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, can be two
The connection of individual element internal or the interaction relationship of two elements, unless otherwise clear and definite restriction.Common for this area
For technical staff, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show
Example " or the description of " some examples " etc. means to combine this embodiment or example describes specific features, structure, material or
Feature is contained at least one embodiment or the example of the present invention.In this manual, the schematic representation to above-mentioned term
Necessarily it is directed to identical embodiment or example.And, the specific features of description, structure, material or feature are permissible
One or more embodiment in office or example combine in an appropriate manner.Additionally, in the case of the most conflicting, ability
The feature of the different embodiments described in this specification or example and different embodiment or example can be entered by the technical staff in territory
Row combines and combination.
Although above it has been shown and described that embodiments of the invention, it is to be understood that above-described embodiment is exemplary,
Being not considered as limiting the invention, those of ordinary skill in the art within the scope of the invention can be to above-described embodiment
It is changed, revises, replaces and modification.
Claims (9)
1. the net-fault stoppage protection circuit for fan, it is characterised in that described fan includes guard and motor, described
Net-fault stoppage protection circuit includes:
Commutation circuit, the input of described commutation circuit is connected with alternating current power supply, the outfan of described commutation circuit and described electricity
Machine is connected；
Touch signal generation circuit, described touch signal generation circuit shuts down letter in order to generate when described guard is touched to touch
Number；
Zero cross detection circuit, described zero cross detection circuit be connected with described alternating current power supply with detect described alternating current power supply voltage mistake
Zero-signal；And
Master controller, described master controller is examined with described commutation circuit, described touch signal generation circuit and described zero passage respectively
Slowdown monitoring circuit be connected, described master controller when receiving described touch stopping signal according to described alternating current power supply voltage zero-cross letter
Number described commutation circuit is controlled, with by described commutation circuit output unidirectional current to described motor so that described motor
Stall.
2. the net-fault stoppage protection circuit for fan as claimed in claim 1, it is characterised in that described master controller exists
By controlling described commutation circuit output AC electricity extremely described motor when not receiving described touch stopping signal, so that described electricity
Machine runs well.
3. the net-fault stoppage protection circuit for fan as claimed in claim 1 or 2, it is characterised in that described commutation electricity
Road includes:
First to fourth switch element, one end of the first switch element and one end of second switch unit exchange with described after being connected
One end of power supply is connected, and one end of the 3rd switch element is connected with one end of the 4th switch element afterwards another with described alternating current power supply
One end is connected, and the other end of described first switch element is connected rear and described motor with the other end of described 3rd switch element
One end is connected, and the other end of described second switch unit is connected rear and described motor with the other end of described 4th switch element
The other end is connected, and the control end of described first to fourth switch element is connected with described master controller respectively.
4. the net-fault stoppage protection circuit for fan as claimed in claim 3, it is characterised in that described first switch is single
The circuit structure of first and described second switch unit is identical, and described first switch element includes:
First switching tube, the first end of described first switching tube is connected with one end of described alternating current power supply, described first switching tube
The second end be connected with one end of described motor；
First photoelectrical coupler, the first end of described first photoelectrical coupler by the first resistance and described first switching tube the
One end is connected, and the second end of described first photoelectrical coupler is connected with the control end of described first switching tube, described first photoelectricity
3rd end of bonder and first is preset power supply and is connected, and the 4th end of described first photoelectrical coupler passes through the second resistance with described
Master controller is connected.
5. the net-fault stoppage protection circuit for fan as claimed in claim 4, it is characterised in that described 3rd switch is single
The circuit structure of first and described 4th switch element is identical, and described 3rd switch element includes:
Second switch pipe, the first end of described second switch pipe is connected with the other end of described alternating current power supply, described second switch
Second end of pipe is connected with the other end of described motor, and the control end of described second switch pipe is by the 3rd resistance and described master control
Device processed is connected.
6. the net-fault stoppage protection circuit for fan as claimed in claim 5, it is characterised in that described first switching tube
It is controllable silicon with second switch pipe.
7. the net-fault stoppage protection circuit for fan as claimed in claim 1, it is characterised in that described zero passage detection electricity
Road includes:
Diode, the positive pole of described diode is connected with one end of described alternating current power supply；
Audion, the base stage of described audion is connected with the negative pole of described diode by the 4th resistance, described audion
Colelctor electrode is preset power supply by the 5th resistance and first and is connected, and is connected with described master controller by the 6th resistance, and described three
The grounded emitter of pole pipe；
7th resistance, described 7th resistance is connected between base stage and the emitter stage of described audion.
8. the net-fault stoppage protection circuit for fan as claimed in claim 3, it is characterised in that described master controller root
The switching sequence of described first to fourth switch element is controlled so that described commutation is electric according to the voltage zero-crossing signal of described alternating current power supply
The alternating current that described alternating current power supply exports is converted to described unidirectional current by road.
9. a fan, it is characterised in that include that the net-fault for fan as according to any one of claim 1-8 is shut down
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 true CN105914708A (en) | 2016-08-31 |
| CN105914708B CN105914708B (en) | 2019-08-27 |
Family
ID=56753711
Family Applications (1)
| 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 |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105914708B (en) |
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 |
|---|---|
| CN105914708B (en) | 2019-08-27 |
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