CN108270426A - A kind of Zero-power-consumption standby power down switch module with button switch - Google Patents
A kind of Zero-power-consumption standby power down switch module with button switch Download PDFInfo
- Publication number
- CN108270426A CN108270426A CN201810253178.5A CN201810253178A CN108270426A CN 108270426 A CN108270426 A CN 108270426A CN 201810253178 A CN201810253178 A CN 201810253178A CN 108270426 A CN108270426 A CN 108270426A
- Authority
- CN
- China
- Prior art keywords
- resistance
- pin
- capacitance
- triode
- power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/567—Circuits characterised by the use of more than one type of semiconductor device, e.g. BIMOS, composite devices such as IGBT
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/96—Touch switches
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/0036—Means reducing energy consumption
Abstract
A kind of Zero-power-consumption standby power down switch module with button switch, is related to power down switch technical field, it is characterised in that：Including being connected to the L1 ends of 220V power supplys and N2 ends, it is connected to the N4 ends of the power input of control electric appliance and L3 ends and button switch AN1, the first capacitance C1, bridge rectifier, the first voltage-stabiliser tube VD1, first resistor R1, the second capacitance C2, first triode Q1, second resistance R3,3rd resistor R4, the 4th resistance R5,5th resistance R6, the 6th resistance R7, third capacitance C3,4th capacitance C4, the second triode Q2, the 7th resistance R8, photoelectrical coupler IC1, the 8th resistance R9, two-way controllable extension VT1；The configuration of the present invention is simple, push-button switch structure is easily controllable, by button switch can quickly start with closing control electric appliance, realize when control electric appliance for standby mode when power consumption be zero, energy saving and cost lowering；By multiple Zero-power-consumption standby power down switch wired in parallel with button switch, the function of one lamp of multi-joint control can also be achieved.
Description
Technical field：
The present invention relates to power down switch technical fields, and in particular to a kind of Zero-power-consumption standby power down switch with button switch
Module.
Background technology：
When many electronic products, the household electrical appliance in China are in idle function at present, there is very big stand-by power consumption, electric appliance
The electric energy that product is consumed when standby, has become a kind of serious energy waste.By taking household electrical appliance as an example, a city man
The household electrical appliance for having idle function in front yard have nearly more than 10 to plant, and per monthly average stand-by power consumption between 15-30 watts, this number accounts for
To 10% or so of family's power consumption.That is, inside the electricity charge that every month, one family was paid, one one-tenth is to treat
Machine power consumption is checked.As energy conservation and environmental protection becomes common recognition, lower stand-by power consumption technology is also paid attention to by consumer, zero-power
The research and development of stand-by energy-saving technology have very big meaning, if Zero-power-consumption standby power down switch module is used in various electronics
In product, unnecessary waste will be greatly reduced, good defencive function can also be played to environment.
Invention content：
The technical problems to be solved by the invention are to provide a kind of Zero-power-consumption standby energy-saving module with button switch,
Solve existing household electrical appliance and when electronic product is in standby mode, there are standby consumption, the situation that electricity consumption is caused to waste.
The technical problems to be solved by the invention are realized using following technical solution：
A kind of Zero-power-consumption standby power down switch module with button switch, it is characterised in that：Including being connected to 220V power supplys
L1 ends and N2 ends, be connected to the N4 ends of power input of control electric appliance and L3 ends and button switch AN1, the first capacitance
C1, bridge rectifier, the first voltage-stabiliser tube VD1, first resistor R1, the second capacitance C2, the first triode Q1, second resistance R3, the
Three resistance R4, the 4th resistance R5, the 5th resistance R6, the 6th resistance R7, third capacitance C3, the 4th capacitance C4, the second triode
Q2, the 7th resistance R8, photoelectrical coupler IC1, the 8th resistance R9, two-way controllable extension VT1；
The L1 ends be respectively connected to first capacitance C1 one end, bidirectional triode thyristor VT1 the 1st pin and the 8th resistance R9
One end, the first capacitor C1 other ends are connected to the 1st connecting pin of bridge rectifier, and the 3rd connecting pin of bridge rectifier connects respectively
Be connected to N2 ends, N4 ends, the 4th connecting pin ground connection of bridge rectifier, described first voltage-stabiliser tube VD1 one end, first resistor R1 one end,
Second capacitance C2 one end, the first triode Q1 emitters, second resistance R3 one end are respectively connected to the 2nd of bridge rectifier and connect
End, the first voltage-stabiliser tube VD1 other ends, the first resistor R1 other ends and the second capacitance C2 other ends are grounded respectively；
The second resistance R3 other ends are connected to the base stage of the first triode Q1, and described 3rd resistor R4 one end is connected to
The base stage of first triode Q1, the other end are connected to the collector of the second triode Q2；Described 4th resistance R5 one end is connected to
The collector of second triode Q2, described switch button AN1 one end are respectively connected to the 4th resistance R5 other ends, third capacitance C3
One end, the other end are connected to the 4th capacitance C4 one end；One end of the 5th resistance R6 is connected to the current collection of the first triode Q1
Pole, the other end are connected to the base stage of the second triode Q2；The third capacitance C3 other ends, the 4th capacitance C4 other ends, the 6th
The emitter of the resistance R7 other ends and the second triode Q2 are respectively connected to ground；
Described 7th resistance R8 one end is connected to the collector of the first triode Q1, and the other end is connected to photoelectrical coupler
The 1st pin of IC1；The second pin ground connection of the photoelectrical coupler IC1, the 3rd pin of photoelectrical coupler IC1 is connected to double
To controllable the 2nd pin for hanging VT1, the 4th pin of photoelectrical coupler IC1 is connected to the other end of the 8th resistance R9；It is described two-way
Controllable the 3rd pin connection L3 ends for hanging VT1；
The bridge rectifier is to be connected into primary Ioops by four diode D1-D4 to form, and D1, that is, bridge rectifier the 1st connects
Connect end, D2 i.e. the 2nd connecting pin of bridge rectifier, D3 i.e. the 3rd connecting pin of bridge rectifier, D4 i.e. the 4th connecting pin of bridge rectifier；
The other end of the resistance R8 is connected to the pin 1 of the IC1 of photoelectrical coupler；
The pin 2 of the photoelectrical coupler IC1 is grounded, and pin 4 is connect with one end of resistance 9, pin 3 and bidirectional triode thyristor
VTI two-way controllable pin 2；
The pin 1 of the bidirectional triode thyristor VTI connects the other end of resistance R9, and pin 3 connects power output end.
Compared with prior art, beneficial effects of the present invention are：The configuration of the present invention is simple, push-button switch structure are easy to control
System, by button can quickly start with closing control electric appliance, realize when control electric appliance for standby mode when power consumption be
Zero, energy saving and cost lowering.By multiple Zero-power-consumption standby power down switch wired in parallel with button switch, multi-joint control one can also be achieved
The function of lamp.
Description of the drawings：
Fig. 1 is the structural diagram of the present invention.
Specific embodiment：
Below in conjunction with being specifically illustrating and specific embodiment, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only the part of the embodiment of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, other realities that those of ordinary skill in the art are obtained without making creative work
Example is applied, belongs to protection scope of the present invention.
Embodiment 1：
As shown in Figure 1, the Zero-power-consumption standby power down switch module with button switch in a kind of smoke exhaust ventilator, including connection
To the L1 ends of 220V power supplys and N2 ends, it is connected to the N4 ends of the power input of control electric appliance and L3 ends and button switch
AN1, the first capacitance C1, bridge rectifier, the first voltage-stabiliser tube VD1, first resistor R1, the second capacitance C2, the first triode Q1, the
Two resistance R3,3rd resistor R4, the 4th resistance R5, the 5th resistance R6, the 6th resistance R7, third capacitance C3, the 4th capacitance C4, the
Two triode Q2, the 7th resistance R8, photoelectrical coupler IC1, the 8th resistance R9, two-way controllable extension VT1.
The L1 ends be respectively connected to first capacitance C1 one end, bidirectional triode thyristor VT1 the 1st pin and the 8th resistance R9
One end, the first capacitor C1 other ends are connected to the 1st connecting pin of bridge rectifier, and the 3rd connecting pin of bridge rectifier connects respectively
Be connected to N2 ends, N4 ends, the 4th connecting pin ground connection of bridge rectifier, described first voltage-stabiliser tube VD1 one end, first resistor R1 one end,
Second capacitance C2 one end, the first triode Q1 emitters, second resistance R3 one end are respectively connected to the 2nd of bridge rectifier and connect
End, the first voltage-stabiliser tube VD1 other ends, the first resistor R1 other ends and the second capacitance C2 other ends are grounded respectively.
The second resistance R3 other ends are connected to the base stage of the first triode Q1, and described 3rd resistor R4 one end is connected to
The base stage of first triode Q1, the other end are connected to the collector of the second triode Q2；Described 4th resistance R5 one end is connected to
The collector of second triode Q2, described switch button AN1 one end are respectively connected to the 4th resistance R5 other ends, third capacitance C3
One end, the other end are connected to the 4th capacitance C4 one end；One end of the 5th resistance R6 is connected to the current collection of the first triode Q1
Pole, the other end are connected to the base stage of the second triode Q2；The third capacitance C3 other ends, the 4th capacitance C4 other ends, the 6th
The emitter of the resistance R7 other ends and the second triode Q2 are respectively connected to ground.
Described 7th resistance R8 one end is connected to the collector of the first triode Q1, and the other end is connected to photoelectrical coupler
The 1st pin of IC1；The second pin ground connection of the photoelectrical coupler IC1, the 3rd pin of photoelectrical coupler IC1 is connected to double
To controllable the 2nd pin for hanging VT1, the 4th pin of photoelectrical coupler IC1 is connected to the other end of the 8th resistance R9；It is described two-way
Controllable the 3rd pin connection L3 ends for hanging VT1.
Operation principle：
L1 ends and N2 ends are connected on 220V power supplys first, N4 ends and L3 ends are connected to the unit of controlled electric appliance
On input terminal.
220V voltages on L1 ends export the direct current of 5V after C1 capacitance decompressions, bridge rectifier rectification and C2 capacitor filterings
Voltage, is connected to the emitter of Q1 triodes all the way, and another way is connected to the base stage of Q1 triodes, while tri- poles of Q1 through R3 circuits
Pipe is connected to the collector of Q2 triodes through R4 resistance, and the collector of Q2 triodes is connected with R5 resistance, and the R5 resistance other end connects
One end of AN1 button switches is connected to, while is also connected with C3 capacitances to ground, such R3, R4, R5 resistance charges to capacitance C3, makes C3
Capacitance is fully charged quickly, but at this time because AN1 button switches are not pressed connection, Q1 transistor base no-voltages, therefore Q1 tri-
Pole is not turned on, therefore Q2 triodes are also not turned on, and IC1 photoelectrical coupler internal illumination pipes do not shine, and the of IC1 photoelectrical couplers
3 pins and the 4th pin are not turned on, and are not turned on VT1 bidirectional triode thyristors, therefore are made kitchen ventilator no power, do not worked, in kitchen ventilator
Portion's circuit is completely in obstructed electricity condition.
But when needing the kitchen ventilator to work, press on switch button AN1, C3 capacitance charged pressure by Q2 transistor bases,
R7 resistance and the electric discharge of Q2 transistor emitters, make Q2 triode ONs, current collection extremely low level makes Q1 triode ONs, Q1 tri-
Pole pipe collector output high level is divided into two-way, is connected to the base stage of Q2 triodes through R6 all the way, obtains Q2 transistor bases electric
It is held on, another way is connected to the 1st pin of IC1 photoelectrical couplers through R8 resistance, makes IC1 optocoupler work once electrifieds, IC1 photoelectricity
4th pin of coupler is connected to the L1 ends of 220V voltages by R9 resistance, makes photoelectricity triggering VT1 inside IC1 photoelectrical couplers
The 3rd pin of bidirectional triode thyristor output high level is connected to the 2nd pin of VT1 bidirectional triode thyristors, and triggering VT1 bidirectional triode thyristors are led
Logical, the 3rd pin output 220V voltages of VT1 bidirectional triode thyristors make smoke exhaust ventilator circuitry work once electrified.At this time when AN1 buttons
After switch clicks release, the electricity not discharged on C3 will be discharged by R5 resistance to Q2 transistor collectors, when switch AN1 buttons
After release, Q1 triode ONs, the high level of collector output is held on Q2 triodes by R6 resistance, makes Q1 tri- in this way
Pole pipe is held on.IC1 photoelectrical couplers, which obtain, electric remains powered on working condition.When needing to close smoke exhaust ventilator, then press one
After lower AN1 button switches, the base voltage of Q2 triodes can be allowed to discharge through R5 resistance to Q2 triode collection moment to C3 capacitances
Electrode discharge is pulled low Q2 transistor base voltages and is less than 0.3V, Q2 triodes is prevented to be in cut-off state from being connected,
After the cut-off of Q2 triodes, Q1 transistor bases are also switched off in high level, Q1 transistor collectors output low level, IC1 photoelectricity
Coupler dead electricity does not work, and makes the 2nd pin trigger voltage of VT1 bidirectional triode thyristors and ends, the 3rd pin Non voltage output, makes pumping
Circuitry power-off inside kitchen ventilator reaches Zero-power-consumption standby state so as to reach smoke exhaust ventilator idle when, reaches
The purpose of using electricity wisely.
Embodiment 2：As shown in Figure 1, a kind of Zero-power-consumption standby power down switch module with button switch, including being connected to
The L1 ends of 220V power supplys and N2 ends are connected to the N4 ends of power input of control electric appliance and L3 ends and button switch AN1,
First capacitance C1, bridge rectifier, the first voltage-stabiliser tube VD1, first resistor R1, the second capacitance C2, the first triode Q1, second is electric
Hinder R3,3rd resistor R4, the 4th resistance R5, the 5th resistance R6, the 6th resistance R7, third capacitance C3, the 4th capacitance C4, the two or three
Pole pipe Q2, the 7th resistance R8, photoelectrical coupler IC1, the 8th resistance R9, two-way controllable extension VT1.
The L1 ends be respectively connected to first capacitance C1 one end, bidirectional triode thyristor VT1 the 1st pin and the 8th resistance R9
One end, the first capacitor C1 other ends are connected to the 1st connecting pin of bridge rectifier, and the 3rd connecting pin of bridge rectifier connects respectively
Be connected to N2 ends, N4 ends, the 4th connecting pin ground connection of bridge rectifier, described first voltage-stabiliser tube VD1 one end, first resistor R1 one end,
Second capacitance C2 one end, the first triode Q1 emitters, second resistance R3 one end are respectively connected to the 2nd of bridge rectifier and connect
End, the first voltage-stabiliser tube VD1 other ends, the first resistor R1 other ends and the second capacitance C2 other ends are grounded respectively.
The second resistance R3 other ends are connected to the base stage of the first triode Q1, and described 3rd resistor R4 one end is connected to
The base stage of first triode Q1, the other end are connected to the collector of the second triode Q2；Described 4th resistance R5 one end is connected to
The collector of second triode Q2, described switch button AN1 one end are respectively connected to the 4th resistance R5 other ends, third capacitance C3
One end, the other end are connected to the 4th capacitance C4 one end；One end of the 5th resistance R6 is connected to the current collection of the first triode Q1
Pole, the other end are connected to the base stage of the second triode Q2；The third capacitance C3 other ends, the 4th capacitance C4 other ends, the 6th
The emitter of the resistance R7 other ends and the second triode Q2 are respectively connected to ground.
Described 7th resistance R8 one end is connected to the collector of the first triode Q1, and the other end is connected to photoelectrical coupler
The 1st pin of IC1；The second pin ground connection of the photoelectrical coupler IC1, the 3rd pin of photoelectrical coupler IC1 is connected to double
To controllable the 2nd pin for hanging VT1, the 4th pin of photoelectrical coupler IC1 is connected to the other end of the 8th resistance R9；It is described two-way
Controllable the 3rd pin connection L3 ends for hanging VT1.
By above-mentioned multiple Zero-power-consumption standby power down switch wired in parallel with button switch, it can be achieved that one lamp of multi-joint control
Function.
Although an embodiment of the present invention has been shown and described.It for the ordinary skill in the art, can be with
Understanding without departing from the principles and spirit of the present invention can carry out these embodiments a variety of variations, modification, replace
And deformation, the scope of the present invention is defined by the appended.
Claims (5)
1. a kind of Zero-power-consumption standby power down switch module with button switch, it is characterised in that：Including being connected to 220V power supplys
L1 ends and N2 ends are connected to the N4 ends of power input of control electric appliance and L3 ends and button switch AN1, the first capacitance C1,
Bridge rectifier, the first voltage-stabiliser tube VD1, first resistor R1, the second capacitance C2, the first triode Q1, second resistance R3, third electricity
Hinder R4, the 4th resistance R5, the 5th resistance R6, the 6th resistance R7, the third capacitance triode Q2 of C3, the 4th capacitance C4, second, the
Seven resistance R8, photoelectrical coupler IC1, the 8th resistance R9, two-way controllable extension VT1；The L1 ends are respectively connected to the first capacitance
C1 one end, the 1st pin of bidirectional triode thyristor VT1 and the 8th resistance R9 one end, it is whole that the first capacitor C1 other ends are connected to bridge-type
The 1st connecting pin of device is flowed, the 3rd connecting pin of bridge rectifier is respectively connected to N2 ends, N4 ends, the 4th connecting pin of bridge rectifier
Ground connection, described first voltage-stabiliser tube VD1 one end, first resistor R1 one end, second capacitance C2 one end, the first triode Q1 emitters,
Second resistance R3 one end is respectively connected to the 2nd connecting pin of bridge rectifier, the first voltage-stabiliser tube VD1 other ends, the first electricity
The resistance R1 other ends and the second capacitance C2 other ends are grounded respectively；The second resistance R3 other ends are connected to the first triode Q1's
Base stage, described 3rd resistor R4 one end are connected to the base stage of the first triode Q1, and the other end is connected to the collection of the second triode Q2
Electrode；Described 4th resistance R5 one end is connected to the collector of the second triode Q2, and described switch button AN1 one end connects respectively
To the 4th resistance R5 other ends, third capacitance C3 one end, the other end is connected to the 4th capacitance C4 one end；The 5th resistance R6's
One end is connected to the collector of the first triode Q1, and the other end is connected to the base stage of the second triode Q2；The third capacitance C3
The other end, the 4th capacitance C4 other ends, the 6th resistance R7 other ends and the second triode Q2 emitter be respectively connected to ground；
Described 7th resistance R8 one end is connected to the collector of the first triode Q1, and what the other end was connected to photoelectrical coupler IC1 the 1st draws
Foot；The second pin ground connection of the photoelectrical coupler IC1, the 3rd pin of photoelectrical coupler IC1 are connected to two-way controllable extension
The 2nd pin of VT1, the 4th pin of photoelectrical coupler IC1 are connected to the other end of the 8th resistance R9；The two-way controllable extension VT1
The 3rd pin connection L3 ends.
2. a kind of Zero-power-consumption standby power down switch module with button switch according to claim 1, it is characterised in that：Institute
It is to be connected into primary Ioops by four diode D1-D4 to form to state bridge rectifier.
3. a kind of Zero-power-consumption standby power down switch module with button switch according to claim 1, it is characterised in that：Institute
The pin 2 for stating photoelectrical coupler IC1 is grounded, and pin 4 is connect with one end of resistance 9, and the pin 3 and VTI's of bidirectional triode thyristor is double
To controllable pin 2.
4. a kind of Zero-power-consumption standby power down switch module with button switch according to claim 1, it is characterised in that：Institute
State resistance R8 the other end be connected to photoelectrical coupler IC1 pin 1.
5. a kind of Zero-power-consumption standby power down switch module with button switch according to claim 1, it is characterised in that：Institute
The pin 1 for stating bidirectional triode thyristor VTI connects the other end of resistance R9, and pin 3 connects power output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810253178.5A CN108270426A (en) | 2018-03-26 | 2018-03-26 | A kind of Zero-power-consumption standby power down switch module with button switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810253178.5A CN108270426A (en) | 2018-03-26 | 2018-03-26 | A kind of Zero-power-consumption standby power down switch module with button switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108270426A true CN108270426A (en) | 2018-07-10 |
Family
ID=62777858
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810253178.5A Pending CN108270426A (en) | 2018-03-26 | 2018-03-26 | A kind of Zero-power-consumption standby power down switch module with button switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108270426A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110554760A (en) * | 2019-08-31 | 2019-12-10 | 合肥趣客电子商务有限公司 | Light-operated detection zero-power-consumption standby computer power socket circuit |
-
2018
- 2018-03-26 CN CN201810253178.5A patent/CN108270426A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110554760A (en) * | 2019-08-31 | 2019-12-10 | 合肥趣客电子商务有限公司 | Light-operated detection zero-power-consumption standby computer power socket circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201773297U (en) | Single-live wire wall-mounted type remote switch | |
| CN103312130B (en) | A kind of Bidirectional thyristor trigger circuit and method | |
| CN204481681U (en) | A kind of interleaved parallel PFC switching power circuit | |
| CN206251406U (en) | A kind of single live wire soft-touch control power-supply circuit | |
| CN108270426A (en) | A kind of Zero-power-consumption standby power down switch module with button switch | |
| CN106896859B (en) | A kind of automatic washing machine Zero consumption standby circuit | |
| CN204707110U (en) | Zero-power soft-touch control modular circuit | |
| CN205540099U (en) | Solid -state power module of air conditioner standby zero -power | |
| CN208209920U (en) | A kind of Zero-power-consumption standby power down switch module with button switch | |
| CN207318994U (en) | A kind of control circuit | |
| CN205335547U (en) | Electric water heater socket that economizes on electricity | |
| CN105514718B (en) | Electric heater electricity-saving socket | |
| CN105007065B (en) | Touch zero-power electric iron time-delaying energy-saving switch | |
| CN105356871B (en) | Zero-power-consumption standby touches power down switch | |
| CN107505878A (en) | A kind of control circuit | |
| CN204597919U (en) | A kind of multipoint control switch | |
| CN105549488B (en) | Air-conditioner standby zero-power solid-state power source module | |
| CN209562425U (en) | A kind of resistance-capacitance depressurization controlling power circuit | |
| CN108513409B (en) | T8 type LED lamp tube driving circuit driven by multiple ends | |
| CN205160495U (en) | Zero power consumption standby touches power down switch | |
| CN202798444U (en) | Circuit module capable of zero power consumption in a standby state | |
| CN207835883U (en) | A kind of efficient LED driving circuit meeting safety | |
| CN103354426B (en) | AC-DC changes insulating power supply circuit | |
| CN206180873U (en) | Program control instrument circuit is criticized to electricity | |
| CN105305813B (en) | Frequency-variable kitchen ventilator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |