CN210670012U - Time-delay disconnection circuit of projector - Google Patents
Time-delay disconnection circuit of projector Download PDFInfo
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- CN210670012U CN210670012U CN201922431137.3U CN201922431137U CN210670012U CN 210670012 U CN210670012 U CN 210670012U CN 201922431137 U CN201922431137 U CN 201922431137U CN 210670012 U CN210670012 U CN 210670012U
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 21
- 239000003990 capacitor Substances 0.000 claims abstract description 20
- 230000007547 defect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
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Abstract
A projector delay disconnection circuit comprises a switch button S2, wherein one end of the switch button S2 is connected with an L end of an alternating current power supply and a pin 1 of a 12VDC conversion circuit, the other end of the switch button S2 is sequentially connected with an anode of a projector and a common contact of a relay, a normally closed contact of the relay is connected with an N end of the alternating current power supply and a pin 2 of the 12VDC conversion circuit, the anode of the 12VDC conversion circuit is connected with one end of the switch button S1, Vcc of CD4011 and an emitter of a triode, and the cathode of the 12VDC conversion circuit; the other end of the switch button S1 is connected with one end of a capacitor C1, one end of a resistor R2 and pins 1 and 2 of the CD4011 through a resistor R1, the other end of the capacitor C1 is connected with GND, the other end of the resistor R2 is connected with the cathode of a red light-emitting diode, the anode of a diode D1 and one end of a relay coil, the other end of the relay coil is connected with the collector of a triode, the anode of the red light-emitting diode and the cathode of a diode D1, the base of the triode is connected with pin 3 of the CD4011, and pins 4, 5, 6, Vss, 8, 9, 10; the utility model has the advantages of timing is accurate, the interference killing feature is strong, save the cost etc.
Description
Technical Field
The utility model belongs to the technical field of the projecting apparatus control, concretely relates to projecting apparatus time delay break circuit.
Background
With the development of modern education, the multimedia projector has wide application in classroom teaching with the advantages of clear image-text, intuitive teaching and the like. However, the multimedia projector must be powered off after being turned off after a period of heat dissipation, otherwise the service life of the multimedia projector is affected, and even a bulb explosion accident occurs under severe conditions, so that the damage of the projector equipment is caused, and the proceeding of classroom teaching contents is affected. At present, in order to ensure the safety of a projector instrument, a manual on-duty mode is generally adopted to wait for manual power failure after the heat dissipation of the projector is finished, the mode is time-consuming and labor-consuming and has higher labor cost, in addition, in order to ensure the safety of the projector, a manufacturer continuously carries out technical improvement on the projector equipment, but partial improvement technology also has partial defects, for example, a pure analog circuit mode is adopted to carry out power failure delay design, but the defects of inaccurate delay time, unreliable circuits and the like exist; a 555 timer chip is adopted for delaying, although the timing is accurate, the defects that peripheral devices are too many, the occupied space of a PCB is large and the like exist; and a singlechip is adopted for time delay, so that the timing precision is high, the cost is high, and the technical route is complex.
Disclosure of Invention
In order to overcome the shortcoming of the prior art, the utility model aims to provide a projecting apparatus time delay open circuit adopts CD4011 to cut off the power supply time delay design, has regularly accurate, the interference killing feature is strong, peripheral device is few, save advantages such as cost.
In order to achieve the above purpose, the utility model discloses the technical scheme who takes does:
a projector delay disconnection circuit comprises a switch button S2, wherein one end of the switch button S2 is connected with the L end of an alternating current power supply AC1 and the 1-pin end of a 12VDC conversion circuit, the other end of the switch button S2 is connected with the positive end of a projector, the negative end of the projector is connected with the common contact end of a relay K1, the normally closed contact end of a relay K1 is connected with the N end of an alternating current power supply AC1 and the 2-pin end of the 12VDC conversion circuit, the positive end of the 12VDC conversion circuit is connected with one end of a switch button S1, the Vcc end of a CD4011 and the emitter end of a triode Q1, and the negative end of the 12VDC conversion circuit is connected with the GN;
the other end of the switch button S1 is connected with one end of a resistor R1, the other end of a resistor R1 is connected with one end of a capacitor C1, one end of a resistor R2, a pin 1 of a CD4011 and a pin 2 of the CD4011, the other end of a capacitor C1 is connected with a GND end, the other end of a resistor R2 is connected with a cathode end of a red light emitting diode L1, an anode end of a diode D1, one end of a relay K1 coil and a GND end, the other end of the relay K1 coil is connected with a collector end of a triode Q1, an anode end of a red light emitting diode L1 and a cathode end of a diode D1, a base end of the triode Q1 is connected with a pin 3 of a CD4011, and a pin 4, a pin 5, a pin 6, a pin, an 8 pin, a pin.
The power supply voltage of the alternating current power supply AC1 is 220V, and the output voltage of the 12VDC conversion circuit is 12V direct current.
The relay K1 is a 5-pin relay with the model of SRD-12VDC-SL-C and the power supply voltage of 12V.
The triode Q1 is a patch type PNP triode with the model number of S9012.
The capacitor C1 is an electrolytic capacitor with the parameter of 1 uF.
The diode D1 is a rectifier diode with the model number of IN 4007.
The parameters of the resistor R1 and the resistor R2 are 220 omega and 1k omega respectively.
The utility model has the advantages that:
1. the time delay processing is carried out through the digital chip CD4011, compared with the time delay of a traditional 555 timer, the time delay timer has the advantages of being strong in anti-interference capacity, accurate in time delay, saving cost, saving wiring space of a PCB and the like.
2. The delayed power-off indication is carried out through the red light-emitting diode, so that a user can clearly and visually know the working condition of the instrument conveniently.
3. The circuit has simple structure, high reliability and low cost.
Drawings
Fig. 1 is a schematic view of the present invention.
Fig. 2 is a schematic diagram showing the flow of current when the projector is operating normally when the on button S2 is pressed.
Fig. 3 is a schematic diagram of the current flow during operation of the time delay disconnect circuit when the off button S1 is pressed.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
Referring to fig. 1, a projector delay disconnection circuit comprises a switch button S2, wherein one end of the switch button S2 is connected with an L terminal of an alternating current power supply AC1 and a 1-pin terminal of a 12VDC conversion circuit, the other end of the switch button S2 is connected with a positive terminal of a projector, a negative terminal of the projector is connected with a common contact terminal of a relay K1, a normally closed contact terminal of a relay K1 is connected with an N terminal of an alternating current power supply AC1 and a 2-pin terminal of the 12VDC conversion circuit, the positive terminal of the 12VDC conversion circuit is connected with one end of a switch button S1, a Vcc terminal of a CD4011 and an emitter terminal of a triode Q1, and the negative terminal of the 12VDC conversion circuit is connected with a GND terminal;
the other end of the switch button S1 is connected with one end of a resistor R1, the other end of a resistor R1 is connected with one end of a capacitor C1, one end of a resistor R2, a pin 1 of a CD4011 and a pin 2 of the CD4011, the other end of a capacitor C1 is connected with a GND end, the other end of a resistor R2 is connected with a cathode end of a red light emitting diode L1, an anode end of a diode D1, one end of a relay K1 coil and a GND end, the other end of the relay K1 coil is connected with a collector end of a triode Q1, an anode end of a red light emitting diode L1 and a cathode end of a diode D1, a base end of the triode Q1 is connected with a pin 3 of a CD4011, and a pin 4, a pin 5, a pin 6, a pin, an 8 pin, a pin.
The power supply voltage of the alternating current power supply AC1 is 220V, and the output voltage of the 12VDC conversion circuit is 12V direct current.
The relay K1 is a 5-pin relay with the model of SRD-12VDC-SL-C and the power supply voltage of 12V.
The triode Q1 is a patch type PNP triode with the model number of S9012.
The capacitor C1 is an electrolytic capacitor with the parameter of 1 uF.
The diode D1 is a rectifier diode with the model number of IN 4007.
The parameters of the resistor R1 and the resistor R2 are 220 omega and 1k omega respectively.
The utility model discloses a theory of operation does:
selecting a CD4011 to design a delay circuit in the whole circuit module, wherein the CD4011 is provided with 4 independent 2-input-end NAND gates, and selecting one NAND gate in which the 1 pin, the 2 pin and the 3 pin are positioned to design the circuit (other three NAND gates are connected to a GND end because the other three NAND gates are not used in the circuit structure).
As shown in fig. 1 and 2, when the switch button S2 is closed and the switch button S1 is opened, the AC power supply AC1 supplies power to the projector, the projector operates normally, meanwhile, the 12VDC conversion circuit is started to convert 220V alternating current into 12V direct current to provide 12V power input for the CD4011, because the switch button S1 is in the off state, the capacitor charging circuit formed by the resistor R1 and the capacitor C1 is not started, the pins 1 and 2 of the CD4011 are in the low potential state, because the pins 1, 2 and 3 of the CD4011 form a 1-way NAND gate, the pin 3 potential is now high and the base terminal of transistor Q1 is also high, since both the base terminal and the emitter of transistor Q1 are high, transistor Q1 is off, therefore, no current flows through the two ends of the relay K1, the normally closed switch of the relay K1 keeps the closed state, and the projector keeps the working state.
As shown in fig. 1 and 3, when the switch button S1 is pressed, the charging circuit of the capacitor, which is composed of the resistor R1 and the capacitor C1, starts to charge, and the charging time formula is:
t ═ R1 × C1 × 0.85 (resistor R1 unit is Ω, capacitor C1 unit is uF, time T unit is S);
the resistance R1 takes the value of 220 omega, the capacitance C1 takes the value of 1uF, the time T obtained through calculation is 187 seconds, namely about 3 minutes, before the RC circuit is fully charged, pins 1 and 2 of the CD4011 are always kept in a low-potential state, pins 3 are always kept in a high-potential state, the normally closed switch of the relay is always kept in a closed state, the projector normally works, after 3 minutes (namely the time when the capacitance is fully charged), pins 1 and 2 of the CD4011 are converted into a high-potential state, pins 3 are converted into a low-potential state, the base terminal of the triode Q1 is also in a low potential, and as the base terminal of the triode Q1 is in the high potential, the triode Q1 is conducted, the coil of the relay K1 is electrified, so that the normally open contact is electrified, the normally closed contact is deenergized, and the switch is attracted to the normally. The power supply input of the projector is disconnected, and the electric equipment stops working. Meanwhile, since the red led L1 is powered, the red led L1 is in a normally on state for power-off indication.
When the input of the 220V alternating current power supply is stopped, the 12VDC conversion circuit stops the direct current output, and at the moment, the capacitor C1 is discharged through the resistor R2, so that the normal operation of the RC charging circuit is ensured next time.
Claims (7)
1. A projector delay disconnection circuit, comprising a switch button S2, characterized in that: one end of a switch button S2 is connected with the L end of an alternating current power supply AC1 and the 1-pin end of a 12VDC conversion circuit, the other end of the switch button S2 is connected with the positive end of a projector, the negative end of the projector is connected with the common contact end of a relay K1, the normally closed contact end of the relay K1 is connected with the N end of the alternating current power supply AC1 and the 2-pin end of the 12VDC conversion circuit, the positive end of the 12VDC conversion circuit is connected with one end of a switch button S1, the Vcc end of a CD4011 and the emitter end of a triode Q1, and the negative end of the 12VDC conversion circuit is connected with;
the other end of the switch button S1 is connected with one end of a resistor R1, the other end of a resistor R1 is connected with one end of a capacitor C1, one end of a resistor R2, a pin 1 of a CD4011 and a pin 2 of the CD4011, the other end of a capacitor C1 is connected with a GND end, the other end of a resistor R2 is connected with a cathode end of a red light emitting diode L1, an anode end of a diode D1, one end of a relay K1 coil and a GND end, the other end of the relay K1 coil is connected with a collector end of a triode Q1, an anode end of a red light emitting diode L1 and a cathode end of a diode D1, a base end of the triode Q1 is connected with a pin 3 of a CD4011, and a pin 4, a pin 5, a pin 6, a pin, an 8 pin, a pin.
2. A projector delay off circuit as claimed in claim 1, wherein: the power supply voltage of the alternating current power supply AC1 is 220V, and the output voltage of the 12VDC conversion circuit is 12V direct current.
3. A projector delay off circuit as claimed in claim 1, wherein: the relay K1 is a 5-pin relay with the model of SRD-12VDC-SL-C and the power supply voltage of 12V.
4. A projector delay off circuit as claimed in claim 1, wherein: the triode Q1 is a patch type PNP triode with the model number of S9012.
5. A projector delay off circuit as claimed in claim 1, wherein: the capacitor C1 is an electrolytic capacitor with the parameter of 1 uF.
6. A projector delay off circuit as claimed in claim 1, wherein: the diode D1 is a rectifier diode with the model number of IN 4007.
7. A projector delay off circuit as claimed in claim 1, wherein: the parameters of the resistor R1 and the resistor R2 are 220 omega and 1k omega respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922431137.3U CN210670012U (en) | 2019-12-30 | 2019-12-30 | Time-delay disconnection circuit of projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922431137.3U CN210670012U (en) | 2019-12-30 | 2019-12-30 | Time-delay disconnection circuit of projector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210670012U true CN210670012U (en) | 2020-06-02 |
Family
ID=70820412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922431137.3U Expired - Fee Related CN210670012U (en) | 2019-12-30 | 2019-12-30 | Time-delay disconnection circuit of projector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210670012U (en) |
-
2019
- 2019-12-30 CN CN201922431137.3U patent/CN210670012U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200602 |