CN209375468U - Circuit for projector adapter - Google Patents
Circuit for projector adapter Download PDFInfo
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- CN209375468U CN209375468U CN201822122307.5U CN201822122307U CN209375468U CN 209375468 U CN209375468 U CN 209375468U CN 201822122307 U CN201822122307 U CN 201822122307U CN 209375468 U CN209375468 U CN 209375468U
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Abstract
The utility model discloses a kind of circuit for projector adapter, including the first current rectifying and wave filtering circuit, the input terminal of the first current rectifying and wave filtering circuit accesses alternating current；Control circuit, control circuit include chip U1 and switching circuit, and the feeder ear of chip U1 connects the output end of the first current rectifying and wave filtering circuit, and switching circuit connects the control terminal of chip U1, and switching circuit is also connected with resistor coupled in parallel circuit；Transformer TR1, the transformer TR1 include primary coil, secondary coil and feedback coil, and one end of the primary coil of transformer TR1 connects the first current rectifying and wave filtering circuit, the other end and switching circuit of the primary coil of transformer TR1；Second current rectifying and wave filtering circuit, the secondary coil of the input terminal connection transformer TR1 of the second current rectifying and wave filtering circuit, the output end of the second current rectifying and wave filtering circuit connect projector apparatus.The utility model power consumption is lower, improves the power of integrated circuit.
Description
Technical field
The utility model relates to porjector technology fields, more particularly to a kind of circuit for projector adapter.
Background technique
With the development of science and technology, present people's lives all be unable to do without sci-tech product, either school instruction, still
Company's meeting can all use projector apparatus to carry out the displaying of data.The existing adapter for projector can only be accomplished
Simple power supply when occurring the failures such as short circuit in circuit can not accomplish to automatically shut down that subsequent conditioning circuit is protected not to be burned out,
In addition, the existing adapter circuit power consumption for projector apparatus is larger, with the development of technology, people are suitable for projector
The requirement of orchestration is also higher and higher, but the existing requirement that can not further reach low-power consumption, green energy resource.
Utility model content
The purpose of this utility model is to provide the high circuits for projector adapter of a kind of small power consumption, power.
A kind of technical solution of circuit for projector adapter disclosed by the utility model is:
For the circuit of projector adapter, including the first current rectifying and wave filtering circuit, first current rectifying and wave filtering circuit it is defeated
Enter to terminate into alternating current.
Control circuit, the control circuit include chip U1 and switching circuit, described in the feeder ear connection of the chip U1
The output end of first current rectifying and wave filtering circuit, the switching circuit connect the control terminal of the chip U1, and the switching circuit also connects
It is connected to resistor coupled in parallel circuit, the other end ground connection of the resistor coupled in parallel circuit, the resistor coupled in parallel circuit includes multiple in parallel
Small valued resistor.
Transformer TR1, the transformer TR1 include primary coil, secondary coil and feedback coil, the transformer TR1
One end of primary coil connect first current rectifying and wave filtering circuit, the other end of the primary coil of the transformer TR1 and institute
State switching circuit.
Second current rectifying and wave filtering circuit, the input terminal of second current rectifying and wave filtering circuit connect the secondary of the transformer TR1
The output end of coil, second current rectifying and wave filtering circuit connects projector apparatus.
Preferably, first current rectifying and wave filtering circuit includes rectifier bridge BD1, the input terminal of the rectifier bridge BD1
Access alternating current, be connected between the rectifier bridge BD1 and alternating current fuse F1, the rectifier bridge BD1 and the fuse F1 it
Between be parallel with varistor MOV1, it is in parallel between the output end of the rectifier bridge BD1 and the transformer TR1, the chip U1
There are capacitor C1, capacitor C2 and common mode inductance LCF1, one end of the capacitor C1 is in series with resistance R9, resistance R10 and accesses the core
The feeder ear of piece U1, the other end ground connection of the capacitor C1.
Preferably, the switching circuit includes field-effect tube Q1, and the gate series of the field-effect tube Q1 have electricity
Hinder R6, the other end of the resistance R6 connects the control terminal of the chip U1, the grid and resistance R6 of the field-effect tube Q1 it
Between be also connected with resistance R16, the other end ground connection of the resistance R16, the resistance R6 and resistance R16 form bleeder circuit, institute
The other end of the primary coil of the drain electrode connection transformer TR1 of field-effect tube Q1 is stated, the source electrode of the field-effect tube Q1 connects institute
State resistor coupled in parallel circuit.
Preferably, the resistor coupled in parallel circuit includes the resistance R1 being connected in parallel, resistance R2, resistance R3 and electricity
R4 is hindered, the resistance R1, resistance R2, resistance R3 and resistance R4 are connected in parallel the source electrode of the field-effect tube Q1, the resistance R1,
One end of resistance R2, resistance R3 and resistance R4 parallel connection is also in series with resistance R5, and the other end of the resistance R5 connects the chip
The pin 4 of U1, the other end ground connection of the resistance R1, resistance R2, resistance R3 and resistance R4.
Preferably, the control circuit further includes having start-up circuit, and the input terminal of the start-up circuit connects institute
State the feedback coil of transformer TR1, the output end parallel connection of the output end of the start-up circuit and first current rectifying and wave filtering circuit
The feeder ear of the chip U1 is connected, the start-up circuit includes diode D3, the model 1N4007 of the diode D3, institute
The anode for stating diode D3 connects the feedback coil of the transformer TR1, and the cathode of the diode D3 connects the chip U1
Feeder ear, the diode D3 anode be also in series with resistance R8, be parallel between the diode D3 and the chip U1
Capacitor C3.
Preferably, high pressure absorption is also connected between first current rectifying and wave filtering circuit and the transformer TR1
Circuit, the high pressure absorbing circuit include capacitor C5, capacitor C7, inductance R11 and inductance R12, the capacitor C5, capacitor C7, electricity
One end of sense R11 and inductance R12 is connected in parallel one end of the primary coil of the transformer TR1, the capacitor C7, inductance R11
The other end of the primary coil of the transformer TR1, another termination of the capacitor C5 are connected in parallel with the other end of inductance R12
Ground.
Preferably, second current rectifying and wave filtering circuit includes diode D1, the anode connection of the diode D1
The secondary coil of the transformer TR1, the positive and negative end of the diode D1 are parallel with capacitor C24 and resistance R23, the electricity
Hold C24 and resistance R23 to be cascaded.
Preferably, second current rectifying and wave filtering circuit further includes having common mode inductance LCF2, the common mode inductance
The other end that capacitor C6, capacitor C7 and inductance R14, the common mode inductance LCF2 are parallel between LCF2 and the diode D1 connects
Projector apparatus is connect to be powered.
It preferably, further include having feed circuit, the input terminal of the feed circuit is connected in parallel on second rectification
In filter circuit, the output end of the feed circuit connects the pin 2 of the chip U1, and the feed circuit includes optocoupler U2,
The collector of the phototriode of the optocoupler U2 is parallel with the pin 2 that capacitor C9 connects the chip U2, the optocoupler U2's
The emitter of phototriode is grounded, and the anode of the light emitting diode of the optocoupler U2 is in series with resistance R22, and is connected to institute
It states between resistance R23 and capacitor C6, the cathode of the light emitting diode of the optocoupler U2 is connected with voltage regulator circuit, the optocoupler U2's
Resistance R21 is also parallel between the anode and cathode of light emitting diode.
Preferably, the voltage regulator circuit includes voltage-stablizer U3, and the pin 3 of the voltage-stablizer U3 connects the optocoupler
The pin 2 of the cathode of the light emitting diode of U2, the voltage-stablizer U3 is grounded, and the pin 1 of the voltage-stablizer U3 is in series with resistance
R17, the other end of the resistance R17 are connected in parallel on one end of the common mode inductance LCF2, the pin 1 of the voltage-stablizer U3 and institute
It states to be parallel between resistance R17 between resistance R18 and the pin 1 and pin 3 of resistance R19, the voltage-stablizer U3 and is parallel with resistance
R20 and capacitor C10.
The utility model provides a kind of circuit for projector adapter, after accessing alternating current, the chip U1 of control circuit
It into working condition, is connected by chip U1 control switch circuit, can be realized regulation, to make the primary coil of transformer to opening
The circuit conducting on powered-down road, resistor coupled in parallel resistance, the small valued resistor of multiple parallel connections of resistor coupled in parallel circuit effectively reduce
Power consumption in circuit improves the power of circuit.Alternating current becomes high straightening by high-voltage alternating after the first current rectifying and wave filtering circuit
Stream is transmitted further to transformer TR1, and transformer TR1 carries out decompression to high voltage direct current and becomes required low-voltage direct, the second rectification
Filter circuit is to the low-voltage direct further progress rectifying and wave-filtering after decompression.The power consumption of the utility model integrated circuit is lower, section
It has saved energy consumption and has improved power.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the circuit for projector adapter of the utility model.
Specific embodiment
The utility model is further elaborated and is illustrated with Figure of description combined with specific embodiments below:
Referring to FIG. 1, it is used for the circuit of projector adapter, including the first current rectifying and wave filtering circuit 10, first rectification
The input terminal of filter circuit 10 accesses alternating current.
Control circuit 20, the control circuit 20 include chip U1 and switching circuit 22, the model of the chip U1
The pin 5 of OB2362, the chip U1 are feeder ear, and the pin 4 of the chip U1 is in series with capacitor C8, and capacitor C8 plays filtering
Effect, the pin 6 of the chip U1 is control terminal, and the pin 1 of the chip U1 is ground terminal, the pin 3 of the chip U1
It is in series with resistance R15.The feeder ear of the chip U1 connects the output end of first current rectifying and wave filtering circuit 10, the switch
Circuit 22 connects the control terminal of the chip U1, and the switching circuit 22 is also connected with resistor coupled in parallel circuit 24, and the resistance is simultaneously
Join the small valued resistor that circuit 24 includes multiple parallel connections.
Transformer TR1, the transformer TR1 include primary coil, secondary coil and feedback coil, the transformer TR1
Primary coil connect first current rectifying and wave filtering circuit 10 and the switching circuit 22.
Second current rectifying and wave filtering circuit 30, the input terminal of second current rectifying and wave filtering circuit 30 connect the transformer TR1's
The output end of secondary coil, second current rectifying and wave filtering circuit 30 connects projector apparatus.
First current rectifying and wave filtering circuit 10 includes rectifier bridge BD1, and the input terminal of the rectifier bridge BD1 accesses alternating current, institute
It states and is connected with fuse F1 between rectifier bridge BD1 and alternating current, be parallel between the rectifier bridge BD1 and the fuse F1 pressure-sensitive
Capacitor C1, capacitor C2 and common mode inductance are parallel between the output end and transformer TR1 of resistance MOV1, the rectifier bridge BD1
The other end of LCF1, the capacitor C1 are grounded.Fuse F1 plays the role of protection, when overtension in circuit, timely burns
It is disconnected.Varistor MOV1 has the effect of that good Anti-surging is anti-lightning strike, and circuit is effectively protected.Capacitor C1 and capacitor C2 are played
The effect of filtering.The model UU-9.8 of common mode inductance LCF1, common mode inductance LCF1 play the role of EMI filtering, effective to filter
It except the electromagnetic interference signal of circuit positive and negative anodes, and prevents electromagnetic interference signal to external radiation, prevents other components by dry
It disturbs.
The switching circuit 22 includes field-effect tube Q1, and the field-effect tube Q1 is N-channel field-effect tube, the field-effect
The model 7N60 of pipe Q1, the gate series of the field-effect tube Q1 have a resistance R6, described in the other end connection of the resistance R6
The control terminal of chip U1 is also connected with resistance R16 between the grid and resistance R6 of the field-effect tube Q1, the resistance R16's
Other end ground connection, the resistance R6 and resistance R16 form bleeder circuit, and the drain electrode of the field-effect tube Q1 connects transformer TR1
Primary coil the other end, the source electrode of the field-effect tube Q1 connects the resistor coupled in parallel circuit 24.When the control of chip U1
When pin 6 being held to export electric signal, resistance R6 and resistance R16 form bleeder circuit, and the resistance value of resistance R6 is higher than the resistance of resistance R16
Value, electric current is high level by the level that resistance R6 is output to the grid of field-effect tube Q1, to make the source electrode of field-effect tube Q1
It is connected with drain electrode.
The resistor coupled in parallel circuit 24 includes resistance R1, resistance R2, resistance R3 and the resistance R4 being connected in parallel, the electricity
Resistance R1, resistance R2, resistance R3 and resistance R4 are connected in parallel the source electrode of the field-effect tube Q1, the resistance R1, resistance R2, resistance
One end of R3 and resistance R4 parallel connection is also in series with resistance R5, and the other end of the resistance R5 connects the pin 4 of the chip U1, institute
State the other end ground connection of resistance R1, resistance R2, resistance R3 and resistance R4.Resistance R5 be big valued resistor, resistance R1, resistance R2,
The resistance value of resistance R3 and resistance R4 are the pull down resistor of small resistance value, so that the power consumption drop after field-effect tube Q1 conducting in circuit
It is low.
The control circuit 20 further includes having start-up circuit 26, and the input terminal of the start-up circuit 26 connects the transformer
The output end of the feedback coil of TR1, the output end of the start-up circuit 26 and first current rectifying and wave filtering circuit 10 is connected in parallel
The feeder ear of the chip U1, the start-up circuit 26 include diode D3, and the diode D3 is the steady of model 1N4007
Diode is pressed, the anode of the diode D3 connects the feedback coil of the transformer TR1, and the cathode of the diode D3 connects
The feeder ear of the chip U1 is connect, the anode of the diode D3 is also in series with resistance R8, the diode D3 and the chip
Capacitor C3 is parallel between U1.Start-up circuit 26 plays the role of bootrom U1 work, and resistance R8 is to adjust resistance, can adjust
Section is output to the electric signal size of chip U1.
High pressure absorbing circuit 40 is also connected between first current rectifying and wave filtering circuit 10 and the transformer TR1, it is described
High pressure absorbing circuit 40 include capacitor C5, capacitor C7, inductance R11 and inductance R12, the capacitor C5, capacitor C7, inductance R11 and
One end of inductance R12 is connected in parallel one end of the primary coil of the transformer TR1, the capacitor C7, inductance R11 and inductance
The other end parallel connection of R12 is connected in series with diode D2, and the other end of the diode D2 connects the primary of the transformer TR1
The other end of coil, the other end ground connection of the capacitor C5.Diode D2 is the zener diode of model 1N4007, diode
D2 prevents electric current reverse circulated, and capacitor C5, capacitor C7 cooperation inductance R11 and inductance R12 effectively absorb the high frequency in circuit
Pulse signal, capacitor C5 can be released over the ground excessive voltage.
Second current rectifying and wave filtering circuit 30 includes diode D1, and the anode of the diode D1 connects the transformer
The secondary coil of TR1, the positive and negative end of the diode D1 are parallel with capacitor C24 and resistance R23, the capacitor C24 and electricity
Resistance R23 is cascaded.The diode D1 is the Schottky barrier diodes of model SB20100, capacitor C24 and resistance
R23 forms RC filter circuit, is filtered effect again to the voltage after decompression, and diode D1 plays the role of rectification, utilizes
The nonlinear characteristic of Schottky barrier diodes, so that the lower power consumption in circuit.
Second current rectifying and wave filtering circuit 30 further includes having common mode inductance LCF2, the common mode inductance LCF2 and two pole
Be parallel between pipe D1 capacitor C6, capacitor C7 and inductance R14, the common mode inductance LCF2 the other end connect projector apparatus into
Row power supply.The model UU-9.8 of common mode inductance LCF2, common mode inductance LCF1 play the role of EMI filtering, effectively filter out electricity
Electromagnetic interference signal in road improves the interference free performance of circuit.Capacitor C6, capacitor C7 and inductance R14 play the role of filtering.
Circuit for projector adapter further includes having feed circuit 50, and the input terminal of the feed circuit 50 is connected in parallel on
In second current rectifying and wave filtering circuit 30, the output end of the feed circuit 50 connects the pin 2 of the chip U1, described anti-
Current feed circuit 50 includes optocoupler U2, and the collector of the phototriode of the optocoupler U2 is in series with resistance R7, and the resistance R7's is another
One end is parallel with the pin 2 that capacitor C9 connects the chip U2, and the emitter ground connection of the phototriode of the optocoupler U2 is described
The anode of the light emitting diode of optocoupler U2 is in series with resistance R22, the other end of the resistance R22 be connected to the resistance R23 and
Between capacitor C6, the other end of the resistance R22 is also parallel with diode ZD1, the cathode of the light emitting diode of the optocoupler U2
It is connected with voltage regulator circuit 52, is also parallel with resistance R21 between the anode and cathode of the light emitting diode of the optocoupler U2.Diode
ZD1 is zener diode, plays the role of protecting circuit.
The voltage regulator circuit 52 includes voltage-stablizer U3, and the pin 3 of the voltage-stablizer U3 connects luminous the two of the optocoupler U2
The pin 2 of the cathode of pole pipe, the voltage-stablizer U3 is grounded, and the pin 1 of the voltage-stablizer U3 is in series with resistance R17, the resistance
The other end of R17 is connected in parallel on one end of the common mode inductance LCF2, between the pin 1 of the voltage-stablizer U3 and the resistance R17
It is parallel between resistance R18 and the pin 1 and pin 3 of resistance R19, the voltage-stablizer U3 and is parallel with resistance R20 and capacitor C10.
When fault-free in circuit, the voltage at the both ends resistance R21 is equal, the light emitting diode cut-off of optocoupler U2；When in circuit go out
When the failures such as existing short circuit, the voltage at the both ends resistance R21 is different, since one end of resistance R21 is connected with voltage regulator circuit, this
When resistance R21 this one end voltage it is normal, the other end voltage of resistance R21 is higher than this one end voltage, to make the hair of optocoupler U2
Optical diode conducting, and then the phototriode of optocoupler U2 is connected, the collector output signal of the phototriode of optocoupler U2
To the chip U1, chip U1 is according to obtained feedback signal, and the field-effect tube Q1 of control switch circuit 22 is closed, to reach
Protect the purpose of circuit.
Specifically, the first current rectifying and wave filtering circuit 10 is by the exchange of high pressure after the first current rectifying and wave filtering circuit 10 accesses alternating current
Electricity is transformed into the direct current of high pressure, and direct current is filtered by capacitor C1, capacitor C2 and common mode inductance LCF1, is anti-interference
After processing, enter in circuit.
After the first current rectifying and wave filtering circuit 10 accesses alternating current, it will appear immediate current in circuit, so that transformer TR1
There is electric current in primary coil, and the secondary coil of transformer TR1 is impacted induced electromotive force is occurred and also generate electric current, transformer TR1
Feedback coil influenced induced electromotive force also occur electric current occur by secondary coil.Occur in the feedback coil of transformer TR1
Electric current is transferred to chip U1 by start-up circuit 26, and the pin 5 of chip U1 inputs the electricity that the transmission of the first current rectifying and wave filtering circuit 10 comes
Stream is not enough to start start-up operation, and chip U1 starting is started to work after the feedback coil transmission incoming current of transformer TR1.
The pin 5 of chip U1 can detect the voltage in circuit, when the overtension in circuit, chip U1 energy
Control field-effect tube Q1 cut-off in time is played the role of protecting circuit.The pin 5 and pin 4 of chip U1 can be to field-effect tube Q1
The voltage at both ends is detected, and the operation of electric current is then carried out by the voltage difference at both ends, is examined to realize to the electric current of circuit
It surveys, when electric current is excessively high in circuit, chip U1 can timely control field-effect tube Q1 cut-off, play the role of protecting circuit.
The utility model provides a kind of circuit for projector adapter, after accessing alternating current, the chip U1 of control circuit
It into working condition, is connected by chip U1 control switch circuit, can be realized regulation, to make the primary coil of transformer to opening
The circuit conducting on powered-down road, resistor coupled in parallel resistance, the small valued resistor of multiple parallel connections of resistor coupled in parallel circuit effectively reduce
Power consumption in circuit improves the power of circuit.Alternating current becomes high straightening by high-voltage alternating after the first current rectifying and wave filtering circuit
Stream is transmitted further to transformer TR1, and transformer TR1 carries out decompression to high voltage direct current and becomes required low-voltage direct, the second rectification
Filter circuit is to the low-voltage direct further progress rectifying and wave-filtering after decompression.The utility model integrated circuit power consumption is lower, saves
Energy consumption improves power.
Finally it should be noted that above embodiments are only to illustrate the technical solution of the utility model, rather than to this reality
With the limitation of novel protected range, although being explained in detail referring to preferred embodiment to the utility model, this field it is general
Lead to it will be appreciated by the skilled person that can be with the technical solution of the present invention is modified or equivalently replaced, without departing from this
The spirit and scope of utility model technical solution.
Claims (10)
1. being used for the circuit of projector adapter, it is characterised in that: including the first current rectifying and wave filtering circuit, first rectifying and wave-filtering
The input terminal of circuit accesses alternating current；
Control circuit, the control circuit include chip U1 and switching circuit, the feeder ear connection described first of the chip U1
The output end of current rectifying and wave filtering circuit, the switching circuit connect the control terminal of the chip U1, and the switching circuit is also connected with
Resistor coupled in parallel circuit, the other end ground connection of the resistor coupled in parallel circuit, the resistor coupled in parallel circuit includes the small resistance of multiple parallel connections
It is worth resistance；
Transformer TR1, the transformer TR1 include primary coil, secondary coil and feedback coil, and the transformer TR1's is first
One end of grade coil connects first current rectifying and wave filtering circuit, the other end of the primary coil of the transformer TR1 and described opens
Powered-down road；
Second current rectifying and wave filtering circuit, the input terminal of second current rectifying and wave filtering circuit connect the secondary coil of the transformer TR1,
The output end of second current rectifying and wave filtering circuit connects projector apparatus.
2. being used for the circuit of projector adapter as described in claim 1, it is characterised in that: first current rectifying and wave filtering circuit
Including rectifier bridge BD1, the input terminal of the rectifier bridge BD1 accesses alternating current, is connected with insurance between the rectifier bridge BD1 and alternating current
Silk F1, is parallel with varistor MOV1, the output end of the rectifier bridge BD1 between the rectifier bridge BD1 and the fuse F1
Capacitor C1, capacitor C2 and common mode inductance LCF1 are parallel between the transformer TR1, the chip U1, the capacitor C1's
One end is in series with resistance R9, resistance R10 accesses the feeder ear of the chip U1, the other end ground connection of the capacitor C1.
3. being used for the circuit of projector adapter as described in claim 1, it is characterised in that: the switching circuit includes field effect
Should pipe Q1, the gate series of the field-effect tube Q1 have resistance R6, and the other end of the resistance R6 connects the control of the chip U1
End processed is also connected with resistance R16 between the grid and resistance R6 of the field-effect tube Q1, the other end of the resistance R16 is grounded,
The resistance R6 and resistance R16 forms bleeder circuit, the primary coil of the drain electrode connection transformer TR1 of the field-effect tube Q1
The source electrode of the other end, the field-effect tube Q1 connects the resistor coupled in parallel circuit.
4. being used for the circuit of projector adapter as claimed in claim 3, it is characterised in that: the resistor coupled in parallel circuit includes
Resistance R1, resistance R2, resistance R3 and resistance R4, the resistance R1, resistance R2, resistance R3 and the resistance R4 being connected in parallel are in parallel
The source electrode of the field-effect tube Q1 is connected, the resistance R1, resistance R2, resistance R3 and one end of resistance R4 parallel connection are also in series with electricity
R5 is hindered, the other end of the resistance R5 connects the pin 4 of the chip U1, the resistance R1, resistance R2, resistance R3 and resistance R4
The other end ground connection.
5. being used for the circuit of projector adapter as described in claim 1, it is characterised in that: the control circuit further includes having
Start-up circuit, the input terminal of the start-up circuit connect the feedback coil of the transformer TR1, the output end of the start-up circuit
The feeder ear of the chip U1 is connected in parallel with the output end of first current rectifying and wave filtering circuit, the start-up circuit includes two poles
The model 1N4007 of pipe D3, the diode D3, the anode of the diode D3 connect the feedback line of the transformer TR1
Circle, the cathode of the diode D3 connect the feeder ear of the chip U1, and the anode of the diode D3 is also in series with resistance R8,
Capacitor C3 is parallel between the diode D3 and the chip U1.
6. being used for the circuit of projector adapter as described in claim 1, it is characterised in that: first current rectifying and wave filtering circuit
Be also connected with high pressure absorbing circuit between the transformer TR1, the high pressure absorbing circuit 40 include capacitor C5, capacitor C7,
Inductance R11 and inductance R12, the capacitor C5, capacitor C7, inductance R11 and inductance R12 one end be connected in parallel the transformer
The other end of one end of the primary coil of TR1, the capacitor C7, inductance R11 and inductance R12 are connected in parallel the transformer TR1
Primary coil the other end, the capacitor C5 the other end ground connection.
7. being used for the circuit of projector adapter as described in claim 1, it is characterised in that: second current rectifying and wave filtering circuit
Including diode D1, the anode of the diode D1 connects the secondary coil of the transformer TR1, and the diode D1's is positive and negative
Pole both ends are parallel with capacitor C24 and resistance R23, and the capacitor C24 and resistance R23 are cascaded.
8. being used for the circuit of projector adapter as claimed in claim 7, it is characterised in that: second current rectifying and wave filtering circuit
Further include having common mode inductance LCF2, be parallel between the common mode inductance LCF2 and the diode D1 capacitor C6, capacitor C7 and
The other end connection projector apparatus of inductance R14, the common mode inductance LCF2 are powered.
9. being used for the circuit of projector adapter as claimed in claim 8, it is characterised in that: it further include having feed circuit, institute
The input terminal for stating feed circuit is connected in parallel in second current rectifying and wave filtering circuit, and the output end of the feed circuit connects the core
The pin 2 of piece U1, the feed circuit include optocoupler U2, and the collector of the phototriode of the optocoupler U2 is parallel with capacitor C9
Connect the pin 2 of the chip U2, the emitter ground connection of the phototriode of the optocoupler U2, the light-emitting diodes of the optocoupler U2
The anode of pipe is in series with resistance R22, and is connected between the resistance R23 and capacitor C6, the light emitting diode of the optocoupler U2
Cathode be connected with voltage regulator circuit, be also parallel with resistance R21 between the anode and cathode of the light emitting diode of the optocoupler U2.
10. being used for the circuit of projector adapter as claimed in claim 9, it is characterised in that: the voltage regulator circuit includes steady
Depressor U3, the pin 3 of the voltage-stablizer U3 connect the cathode of the light emitting diode of the optocoupler U2, the pin of the voltage-stablizer U3
2 ground connection, the pin 1 of the voltage-stablizer U3 are in series with resistance R17, and the other end of the resistance R17 is connected in parallel on the common mode inductance
One end of LCF2 is parallel with resistance R18 and resistance R19 between the pin 1 of the voltage-stablizer U3 and the resistance R17, described steady
Resistance R20 and capacitor C10 are parallel between the pin 1 and pin 3 of depressor U3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822122307.5U CN209375468U (en) | 2018-12-18 | 2018-12-18 | Circuit for projector adapter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822122307.5U CN209375468U (en) | 2018-12-18 | 2018-12-18 | Circuit for projector adapter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209375468U true CN209375468U (en) | 2019-09-10 |
Family
ID=67833091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822122307.5U Active CN209375468U (en) | 2018-12-18 | 2018-12-18 | Circuit for projector adapter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209375468U (en) |
-
2018
- 2018-12-18 CN CN201822122307.5U patent/CN209375468U/en active Active
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