CN106990664A - Projection screen automatic deploying and retracting control box based on operation of current transformers principle - Google Patents
Projection screen automatic deploying and retracting control box based on operation of current transformers principle Download PDFInfo
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- CN106990664A CN106990664A CN201710401720.2A CN201710401720A CN106990664A CN 106990664 A CN106990664 A CN 106990664A CN 201710401720 A CN201710401720 A CN 201710401720A CN 106990664 A CN106990664 A CN 106990664A
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/58—Projection screens collapsible, e.g. foldable; of variable area
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Abstract
The present invention relates to a kind of projection screen automatic deploying and retracting control box based on operation of current transformers principle.Including box body, power input jack, power supply output socket, motor switch connection jaws, AC power, projecting apparatus, screen motor switch, current transformer, current rectifying and wave filtering circuit, triggers circuit, supply convertor, relay, power supply exports led indicator lamps, delay electricity-saving power supply output socket, screen motor, controllable silicon electric-controlled plate, delay circuit, time-delay relay；The beneficial effects of the present invention are：Projecting apparatus is opened with remote control, projection bulb brightens, screen motor rotation, screen is put down automatically；Projecting apparatus is closed with remote control, now projection bulb does not work, the rotation of screen motor, screen is packed up automatically, time saving and energy saving；If connecting screen motor power plug at delay electricity-saving power supply output socket, moreover it is possible to accomplish in projecting apparatus to make when not in use the screen motor of insertion socket to power off entirely, so as to play energy-saving effect.
Description
Technical field
The present invention relates to a kind of projection screen draw off gear, and in particular to a kind of throwing based on operation of current transformers principle
Shadow screen automatic deploying and retracting control box.
Background technology
The patent No. 2016207177312 discloses a kind of projection screen automatic retraction device based on illuminance sensor,
The problem of can solve the problem that projection screen automatic deploying and retracting, but be due to the strong of the light that the illumination being soaked out from projector lamp is mapped to screen
Degree be change, run into light than it is dark when, screen may be packed up automatically, and this results in automatic retraction device in stability
Difference, poor reliability；And illuminance sensor can not be arranged on the reflecting surface of screen when using, and can only install projection screen
Outside, this results in the problem of illuminance sensor does not receive optical signal, the presence of these problems, in the urgent need in the market is sent out
The projection screen automatic deploying and retracting control device of bright a kind of non-illuminance sensor, for solving the deficiencies in the prior art.
The content of the invention
To overcome the deficiencies in the prior art, the present invention is adopted the following technical scheme that, above-mentioned background skill can be solved well
The problem of being proposed in art.
A kind of projection screen automatic deploying and retracting control box based on operation of current transformers principle, including box body, power input
Socket, power supply output socket, motor switch connection jaws, AC power, projecting apparatus, screen motor switch, current transformer, rectification
Filter circuit, triggers circuit, supply convertor, relay, power supply output led indicator lamps, delay electricity-saving power supply output socket, screen
Curtain motor, controllable silicon electric-controlled plate, delay circuit, time-delay relay；Insertion is mounted with power supply in the exterior front panel of the box body
Input socket, power supply output socket, motor switch connection jaws, power supply output led indicator lamps, delay electricity-saving power supply output socket；
The inside of the box body, design and installation current transformer, current rectifying and wave filtering circuit, triggers circuit, supply convertor, relay,
Controllable silicon electric-controlled plate, delay circuit, time-delay relay；The power input jack external connection 220v AC powers, the electricity
There are two power lines, the input of the primary coil of a L live wires connection current transformer, in addition one inside the input socket of source
N zero lines connect the inside N zero lines of power supply output socket, another wire connection electricity of the primary coil input of current transformer
The inside L live wires of source output socket；The secondary coil connection current rectifying and wave filtering circuit of the current transformer, to obtain one with throwing
Shadow instrument consumes the d. c. voltage signal of changed power, and the d. c. voltage signal of this change connects triggers circuit, institute by wire
It is the Schmidt trigger being made of 555 integrated packages to state triggers circuit, and the triggers circuit provides 5v direct currents by supply convertor
Voltage, the input voltage of the supply convertor is exchange 220v, and it passes through the box bodys 1 of two wire connecting power input sockets
Internal L live wires and N zero lines, the relay are 5v DC relays, and its coil is directly connected to triggers circuit by two wires
Output end.
Further, relay connects motor switch connection jaws by three wires, and motor switch connection jaws are connected by plug
Screen motor direction switch is connect, and three conductor in parallel should remove screen motor liter on screen motor direction switch, when using
Drop switch, or screen motor direction switch is in neutral position.
The operation principle for the Schmidt trigger that 555 integrated packages are made is：When the voltage of input is higher than its supply voltage
2/3rds when, trigger exports a low level signal, a termination 5v positive sources of relay coil, and another termination applies close
The output end of special trigger, the coil of such relay obtains 5v DC voltages, the normal open switch closure of relay, screen motor
Obtain electric, screen declines automatically, automatically opens up screen；And when the voltage of input is less than 1/3rd of its supply voltage, touch
Send out device and export a high level signal, the coil of such relay obtains voltage difference for 0v DC voltages, the normal open switch of relay
Disconnect, normally closed switch closure, the switch is due to being connected in parallel on former screen motor direction switch, so screen rises automatically, to receive
Play screen.
When projecting apparatus is plugged into the power supply output socket of box portion outside by power line, projecting apparatus is in holding state,
5-10w electric energy is consumed, changes the primary coil of current transformer and the turn ratio of secondary coil, exports current rectifying and wave filtering circuit
DC voltage be less than 1v, or in the output end of current rectifying and wave filtering circuit, a partial pressure potential device in parallel is used as adjustment of sensitivity
Device, makes the voltage that partial pressure potential device is exported be less than 1v；Projecting apparatus is opened with remote control again, projection bulb brightens, and projecting apparatus disappears
Wasted work rate calculates the number of turn that the secondary coil of current transformer needs, makes the straight of current rectifying and wave filtering circuit output in 100w or so
Flow voltage and be more than 3.5v, or by adjusting partial pressure potential device, output voltage is more than 3.5v, now triggers circuit exports low electricity
Flat, the coil of such relay obtains 5v DC voltages, and the normal open switch closure of relay, screen is put down, reached certainly automatically
The dynamic purpose for opening projection screen.
After playing lantern slides terminate or after video playback terminates, then with remote control projecting apparatus is closed, now projection bulb
Do not work, the general power of projecting apparatus consumption is in 5-10w, and the DC voltage of current rectifying and wave filtering circuit output is less than 1v, Schmidt trigger
Upset, triggers circuit output high level, what the coil of such relay was obtained is that voltage difference is 0v DC voltages, relay it is normal
Switch off, normally closed switch closure, screen motor is rotated, and drives screen to rise, screen is packed up automatically.
Further improvement is that, box portion outside increase a delay electricity-saving power supply output socket, time-delay relay it is normally opened
The L live wires of end connection power input jack, the normal closed end of time-delay relay connects the output end of controllable silicon electric-controlled plate, delay after
The movable end of electrical equipment connects the L live wires of delay electricity-saving power supply output socket, and the coil of time-delay relay connects the defeated of delay circuit
Go out end；Delay circuit is triggered using low level, only when triggers circuit exports 0v voltage signals, delay circuit output 5v voltages
Signal is to the coil of time-delay relay, and the normally opened end of time-delay relay is closed, to the voltage of the input of controllable silicon electric-controlled plate
Delay electricity-saving power supply output socket is delivered directly to by the normally opened end of time-delay relay, screen motor obtains electric, and screen can be immediately
Pack up.
Further improvement is that, 5v the or 0v voltage signals of triggers circuit output connect controllable silicon electric-controlled plate by wire
The input of not circuit, the output end of not circuit connects the triggering end of bidirectional triode thyristor, when projecting apparatus is in holding state
When, triggers circuit output 5v voltage signals, the output 0v voltage signals of the not circuit of controllable silicon electric-controlled plate to bidirectional triode thyristor
Triggering end, bidirectional triode thyristor is in cut-off state, and its output end connects the normal-closed end of time-delay relay, and delay electricity-saving power supply is defeated
Going out the L live wires of socket can not obtain electric, delay electricity-saving power supply output socket Non voltage output；When projecting apparatus is in running order,
Triggers circuit exports 0v voltage signals, output 5v voltage signals the touching to bidirectional triode thyristor of the not circuit of controllable silicon electric-controlled plate
Originator, bidirectional triode thyristor is in the conduction state, and its output end connects the normal-closed end of time-delay relay, the normally opened end of time-delay relay
The L live wires of power input jack are connected, the L live wires of delay electricity-saving power supply output socket obtain electric, delay electricity-saving power supply output socket
There is the output of 220v alternating voltages.
Further improvement is that, when closing projecting apparatus, triggers circuit exports high level signal to delay circuit, delay electricity
Rood is to after high level signal, time-delay relay normal open switch closure, delay electricity-saving power supply output socket output 220v alternating currents
2-3 minutes；If the power supply of screen motor is accessed into delay electricity-saving power supply output socket, in 2-3 minutes this section of delay
In time, screen motor packs up screen automatically, after delay terminates, and time-delay relay normal open switch disconnects, normally closed switch closure, this
Bidirectional triode thyristor is in cut-off state under state, and the power-off of delay electricity-saving power supply output socket can be accomplished to make screen motor not make
Used time powers off entirely；Or other electrical equipments are connected, full power-off can be accomplished, so as to reach power savings.
Further improvement is that, power input jack, power supply output socket, delay electricity-saving power supply output socket is market
The concave 220v projecting apparatus of upper sale, desktop computer 220v power lines male plug mouthful, its ground wire are directly connected to the outer of box body
On shell；And motor switch connection jaws also be concave power cord jack, but three power-line plugs be it is arranged in parallel, equally
Matched female power cord jack, three power line jacks are also arranged in parallel；And female power cord jack insertion service message source
Just matched in line socket.
The beneficial effects of the present invention are：Projecting apparatus is opened with remote control, projection bulb brightens, the rotation of screen motor, screen
Curtain is put down automatically；Projecting apparatus is closed with remote control, now projection bulb does not work, screen motor rotation, screen is packed up automatically,
It is time saving and energy saving；If connecting the attaching plug of screen motor at delay electricity-saving power supply output socket, moreover it is possible to accomplish in projecting apparatus
When not in use, screen motor is made to power off entirely, so as to play power savings.
Brief description of the drawings
Fig. 1 is the circuit operation principle and structural representation of the present invention,
Fig. 2 is surface structure schematic diagram of the invention,
Fig. 3 is embodiments of the invention using renderings,
In figure：1st, box body, 2, power input jack, 3, power supply output socket, 4, motor switch connection jaws, 5, AC power, 6,
Projecting apparatus, 7, screen motor switch, 8, current transformer, 9, current rectifying and wave filtering circuit, 10, trigger, 11, supply convertor, 12,
Relay A, 13, led power supply output indicators, 14, delay electricity-saving power supply output socket, 15, screen motor, 16, controllable silicon electricity
Control plate, 17, delay circuit, 18, time-delay relay.
Embodiment
Embodiment 1, as shown in Figure 1, Figure 2, Figure 3 shows, a kind of projection screen based on operation of current transformers principle are received automatically
Put control box, including box body 1, power input jack 2, power supply output socket 3, motor switch connection jaws 4, AC power 5, projection
Instrument 6, screen motor switch 7, current transformer 8, current rectifying and wave filtering circuit 9, triggers circuit 10, supply convertor 11, relay 12,
Power supply output led indicator lamps 13, delay electricity-saving power supply output socket 14, screen motor 15, controllable silicon electric-controlled plate 16, delay circuit
17, time-delay relay 18；Insertion is mounted with power input jack 2, power supply output socket on the external front face panel of the box body 1
3, motor switch connection jaws 4, power supply output led indicator lamps 13, delay electricity-saving power supply output socket 14；The inside of the box body 1,
Design and installation current transformer 8, current rectifying and wave filtering circuit 9, triggers circuit 10, supply convertor 11, relay 12, controllable silicon electricity
Control plate 16, delay circuit 17, time-delay relay 18；The external connection 220v AC powers 5 of power input jack 2, the electricity
There are two power lines inside source input socket 2, the input of the primary coil of a L live wires connection current transformer 8, in addition one
The inside N zero lines of root N zero lines connection power supply output socket 3, another wire of the primary coil input of current transformer 8 connects
Connect the inside L live wires of power supply output socket 3；The secondary coil connection current rectifying and wave filtering circuit 9 of the current transformer 8, to obtain
One d. c. voltage signal with the consumption changed power of projecting apparatus 6, d. c. voltage signal of this change is connected by wire to be touched
Power Generation Road 10, the triggers circuit 10 is the Schmidt trigger being made of 555 integrated packages, and the triggers circuit 10 is become by power supply
Parallel operation 11 provides 5v DC voltages, and the input voltage of the supply convertor 11 is exchange 220v, and it is connected by two wires
The inside L live wires of box body 1 and N zero lines of power input jack 2, the relay 12 are 5v DC relays, and its coil passes through two
Root wire is directly connected to the output end of triggers circuit 10.
Further, relay 12 connects motor switch connection jaws 4 by three wires, and motor switch connection jaws 4 are by inserting
Head connection screen motor direction switch, and three conductor in parallel should remove screen electricity on screen motor direction switch, when using
Machine direction switch, or screen motor direction switch is in neutral position.
The operation principle for the Schmidt trigger that 555 integrated packages are made is：When the voltage of input is higher than its supply voltage
2/3rds when, trigger exports a low level signal, a termination 5v positive sources of the coil of relay 12, and another termination applies
The output end of schmitt trigger, the coil of such relay 12 obtains 5v DC voltages, the normal open switch closure of relay 12, screen
Curtain motor obtains electric, and screen declines automatically, automatically opens up screen；And when the voltage of input is less than 1/3rd of its supply voltage
When, trigger exports a high level signal, and the coil of such relay 12 obtains voltage difference for 0v DC voltages, relay 12
Normal open switch disconnects, normally closed switch closure, and the switch is due to being connected in parallel on former screen motor direction switch, so on screen is automatic
Rise, to pack up screen.
When projecting apparatus 6 is plugged into the power supply output socket 3 outside box body 1 by power line, projecting apparatus 6 is in standby shape
State, consumes 5-10w electric energy, changes the primary coil of current transformer 8 and the turn ratio of secondary coil, makes current rectifying and wave filtering circuit
The DC voltage of 9 outputs is less than 1v, or in the output end of current rectifying and wave filtering circuit 9, and an even partial pressure potential device, as sensitive
Adjusting means is spent, the voltage that partial pressure potential device is exported is less than 1v；Projecting apparatus 6 is opened with remote control again, projection bulb brightens, thrown
Shadow instrument 6 consumes power in 100w or so, changes the number of turn of the secondary coil of current transformer 8, makes what current rectifying and wave filtering circuit 9 was exported
DC voltage is more than 3.5v, or by adjusting partial pressure potential device, output voltage is more than 3.5v, and now triggers circuit 10 is exported
Low level, the coil of such relay 12 obtains 5v DC voltages, and the normal open switch closure of relay 12, screen is put automatically
Under, reach the purpose for automatically opening up projection screen.
After playing lantern slides terminate or after video playback terminates, then with remote control projecting apparatus 6 is closed, now projection bulb
Do not work, the general power that projecting apparatus 6 is consumed is less than 1v, schmidt trigger in 5-10w, the DC voltage that current rectifying and wave filtering circuit 9 is exported
Device is overturn, and the output high level of triggers circuit 10, what the coil of such relay 12 was obtained is that voltage difference is 0v DC voltages, relay
The normal open switch of device 12 disconnects, and normally closed switch closure, screen rises automatically, and screen is packed up automatically.
Further improve is that the outside of box body 1 increases by a delay electricity-saving power supply output socket 14, time-delay relay 18
Normally opened end connects the L live wires of power input jack 2, the output of the normal closed end connection controllable silicon electric-controlled plate 16 of time-delay relay 18
End, the L live wires of the movable end connection delay electricity-saving power supply output socket 14 of time-delay relay 18, the coil of time-delay relay 18 connects
Connect the output end of delay circuit 17；Delay circuit 17 is triggered using low level, only exports 0v voltage signals in triggers circuit 10
When, delay circuit 17 export 5v voltage signals to time-delay relay 18 coil, time-delay relay 18 normally opened end closure, come to
The voltage of the input of controllable silicon electric-controlled plate 16 passes through, and it is defeated that the normally opened end of time-delay relay 18 is delivered directly to delay electricity-saving power supply
Go out socket 14, screen motor 15 obtains electric, can packed up immediately.
Further improve is that it is automatically controlled that 5v the or 0v voltage signals that triggers circuit 10 is exported connect controllable silicon by wire
The input of the not circuit of plate 16, the output end of not circuit connects the triggering end of bidirectional triode thyristor, is treated when projecting apparatus is in
During machine state, the output 5v voltage signals of triggers circuit 10, the output 0v voltage signals of the not circuit of controllable silicon electric-controlled plate 16 are extremely
The triggering end of bidirectional triode thyristor, bidirectional triode thyristor is in cut-off state, and its output end connects the normal-closed end of time-delay relay 18, prolonged
When power saving power output socket 14 L live wires can not obtain electric, the Non voltage output of delay electricity-saving power supply output socket 14；Work as projecting apparatus
When in running order, the output 0v voltage signals of triggers circuit 10, the output 5v voltages of the not circuit of controllable silicon electric-controlled plate 16
Signal is to the triggering end of bidirectional triode thyristor, and bidirectional triode thyristor is in the conduction state, its output end connection time-delay relay 18 it is normal
Closed end, the normally opened end of time-delay relay 18 connects the L live wires of power input jack, the L fire of delay electricity-saving power supply output socket 14
Line obtains electric, and delay electricity-saving power supply output socket 14 has the output of 220v alternating voltages.
Further improve is, when closing projecting apparatus 6, and triggers circuit 10 exports high level signal to delay circuit
17, delay circuit 17 is obtained after high level signal, the normal open switch of time-delay relay 18 closure, delay electricity-saving power supply output socket 14
Export 220v alternating currents 2-3 minutes；If the power supply of screen motor 15 is accessed into delay electricity-saving power supply output socket 14,
In this period of delay 2-3 minutes, screen motor 15 packs up screen automatically, and after delay terminates, time-delay relay 18 is normally opened to be opened
Shut-off is opened, normally closed switch closure, therefore bidirectional triode thyristor is in cut-off state under state, and delay electricity-saving power supply output socket 14 breaks
Electricity, can accomplish to make the full power-off when not in use of screen motor 15；Or other electrical equipments are connected, full power-off can be accomplished, so that
Reach power savings.
Further improve is that power input jack 2, power supply output socket 3, delay electricity-saving power supply output socket 14 is equal
Concave 220v projecting apparatus, the desktop computer 220v power lines male plug mouth sold in the market, its ground wire are directly connected to box
On the shell of body 1；And motor switch connection jaws 4 are also concave power cord jack, but three power-line plugs are parallels
Row, same matched female power cord jack, three power line jacks are also arranged in parallel；And female power cord jack is inserted
Enter and just matched in public power cord jack.
The beneficial effects of the present invention are：Projecting apparatus 6 is opened with remote control, projection bulb brightens, and screen motor 15 rotates,
Screen is put down automatically；Projecting apparatus 6 is closed with remote control, now projection bulb does not work, and screen motor 15 rotates, and screen is automatic
Pack up, it is time saving and energy saving；If connecting the electrical equipment of screen motor 15 or other at delay electricity-saving power supply output socket 14, it can do
To in projecting apparatus 6, when not in use, other electrical equipments of insertion spigot are powered off entirely, so as to play energy-saving effect.
Claims (3)
1. a kind of projection screen automatic deploying and retracting controller based on operation of current transformers principle, including box body（1）, power input
Socket（2）, power supply output socket（3）, motor switch connection jaws（4）, AC power（5）, projecting apparatus（6）, screen motor switch
（7）, current transformer（8）, current rectifying and wave filtering circuit（9）, triggers circuit（10）, supply convertor（11）, relay（12）, power supply
Export led indicator lamps（13）, delay electricity-saving power supply output socket（14）, screen motor（15）, controllable silicon electric-controlled plate（16）, delay
Circuit（17）, time-delay relay（18）；It is characterized in that：The box body（1）Exterior front panel on insertion be mounted with that power supply is defeated
Enter socket（2）, power supply output socket（3）, motor switch connection jaws（4）, power supply output led indicator lamps（13）, delay electricity-saving electricity
Source output socket（14）；The box body（1）Inside, design and installation current transformer（8）, current rectifying and wave filtering circuit（9）, triggering
Circuit（10）, supply convertor（11）, relay（12）, controllable silicon electric-controlled plate（16）, delay circuit（17）, time-delay relay
（18）；The power input jack（2）External connection 220v AC powers（5）, the power input jack（2）Inside has two
Power line, a L live wire connects current transformer（8）Primary coil input, N zero line connection box body in addition（1）
Internal electric source output socket（3）N zero lines, current transformer（8）Primary coil input another cable coupling box body
（1）Internal electric source output socket（3）L live wires；The current transformer（8）Secondary coil connection current rectifying and wave filtering circuit（9）,
For obtaining one with projecting apparatus（6）The d. c. voltage signal of changed power is consumed, the d. c. voltage signal of this change passes through
Wire connects triggers circuit（10）, the triggers circuit（10）For the Schmidt trigger being made of 555 integrated packages, the triggering
Circuit（10）By supply convertor（11）5v DC voltages, the supply convertor are provided（11）Input voltage for exchange
220v, it passes through two cable coupling box bodies（1）Internal electric source input socket（2）L live wires and N zero lines, the relay
（12）For 5v DC relays, its coil is directly connected to triggers circuit by a wire（10）Output end, lead for one in addition
Line connects triggers circuit（10）Power cathode.
2. a kind of projection screen automatic deploying and retracting controller based on operation of current transformers principle according to claim 1,
It is characterized in that：One delay electricity-saving power supply output socket of the outside of box body 1 increase（14）, time-delay relay（18）Normally opened end connection
Power input jack（2）L live wires, time-delay relay（18）Normal closed end connection controllable silicon electric-controlled plate（16）Output end,
Time-delay relay（18）Movable end connection delay electricity-saving power supply output socket（14）L live wires, time-delay relay（18）Line
Circle connection delay circuit（17）Output end；Delay circuit（17）Triggered using low level, only in triggers circuit（10）Output
During 0v voltage signals, delay circuit（17）5v voltage signals are exported to time-delay relay（18）Coil, time-delay relay（18）
Normally opened end closure, to controllable silicon electric-controlled plate（16）The voltage of input pass through time-delay relay（18）Normally opened end it is direct
It is transported to delay electricity-saving power supply output socket（14）, screen motor（15）Obtain electric, screen can be packed up immediately.
3. a kind of projection screen automatic deploying and retracting controller based on operation of current transformers principle according to claim 1,
It is characterized in that：When closing projecting apparatus（6）When, triggers circuit（10）High level signal is exported to delay circuit（17）, delay electricity
Road（17）Obtain after high level signal, time-delay relay（18）Normal open switch is closed, delay electricity-saving power supply output socket（14）It is defeated
Go out 220v alternating currents 2-3 minutes；By screen motor（15）Power supply access delay electricity-saving power supply output socket（14）, prolonging
When this period of 2-3 minutes in, screen motor（15）It is automatic to pack up screen, after delay terminates, time-delay relay（18）It is normally opened
Switch off, normally closed switch closure, bidirectional triode thyristor is in cut-off state, delay electricity-saving power supply output socket under this state（14）
Power-off, can accomplish in projecting apparatus（6）When not in use, the screen motor of insertion spigot is made（15）Full power-off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710401720.2A CN106990664A (en) | 2017-05-31 | 2017-05-31 | Projection screen automatic deploying and retracting control box based on operation of current transformers principle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710401720.2A CN106990664A (en) | 2017-05-31 | 2017-05-31 | Projection screen automatic deploying and retracting control box based on operation of current transformers principle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106990664A true CN106990664A (en) | 2017-07-28 |
Family
ID=59421694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710401720.2A Pending CN106990664A (en) | 2017-05-31 | 2017-05-31 | Projection screen automatic deploying and retracting control box based on operation of current transformers principle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019024212A1 (en) * | 2017-08-01 | 2019-02-07 | 深圳市光峰光电技术有限公司 | Power switch control circuit and projector |
-
2017
- 2017-05-31 CN CN201710401720.2A patent/CN106990664A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019024212A1 (en) * | 2017-08-01 | 2019-02-07 | 深圳市光峰光电技术有限公司 | Power switch control circuit and projector |
| CN109327214A (en) * | 2017-08-01 | 2019-02-12 | 深圳光峰科技股份有限公司 | A kind of power on-off control circuit and projector |
| CN109327214B (en) * | 2017-08-01 | 2021-06-08 | 深圳光峰科技股份有限公司 | Power switch control circuit and projector |
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