CN214228513U - Projector power supply control circuit - Google Patents
Projector power supply control circuit Download PDFInfo
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- CN214228513U CN214228513U CN202120252534.9U CN202120252534U CN214228513U CN 214228513 U CN214228513 U CN 214228513U CN 202120252534 U CN202120252534 U CN 202120252534U CN 214228513 U CN214228513 U CN 214228513U
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- power supply
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The utility model discloses a projector power supply control circuit, which comprises a switch driving module, a main circuit power supply module, a sampling feedback module and an auxiliary circuit power supply module; the input end of the switch driving module is connected with the alternating current power supply equipment, the output end of the switch driving module is connected with the input end of the main circuit power supply module, and the output end of the main circuit power supply module is connected with the LED lamp beads; the output end of the main circuit power supply module is connected with the input end of the auxiliary circuit power supply module, the output end of the auxiliary circuit power supply module is connected with the projector control equipment, the enabling end of the auxiliary circuit power supply module is connected with the input end of the sampling feedback module, the output end of the sampling feedback module is connected with the control end of the main circuit power supply module, and the feedback end of the sampling feedback module is connected with the control end of the switch driving module. The utility model discloses a set up the circular telegram control that the feedback module that takes a sample can realize high-power LED lamp pearl, save the power consumption cost and ensure that it is long when the effective use of lamp pearl.
Description
Technical Field
The utility model relates to a projecting apparatus equipment technical field particularly, relates to a projecting apparatus power control circuit.
Background
In the multimedia teaching equipment, the projector can visually and clearly present teaching contents to students and becomes a core device in the field of multimedia teaching. However, in the whole teaching process, the situation that the projector is not needed to be used midway can be avoided, and the lessee can keep the working state of the projector in principle, namely, the high-power LED lamp beads in the projector can be continuously used, so that unnecessary electric energy resource waste is caused, and the service life of the lamp beads can be shortened in the past.
Disclosure of Invention
An object of the utility model is to overcome the not enough of prior art, the utility model provides a projector power control circuit can realize the circular telegram control to high-power LED lamp pearl through setting up sample feedback module, when using electricity sparingly cost, when guaranteeing effective use of lamp pearl long.
In order to solve the above problems, the present invention provides a power control circuit for a projector, wherein the power control circuit comprises a switch driving module, a main circuit power supply module, a sampling feedback module and an auxiliary circuit power supply module; wherein the content of the first and second substances,
the input end of the switch driving module is connected with an alternating current power supply device, the output end of the switch driving module is connected with the input end of the main circuit power supply module, and the output end of the main circuit power supply module is connected with the LED lamp bead;
the output end of the main circuit power supply module is connected with the input end of the auxiliary circuit power supply module, the output end of the auxiliary circuit power supply module is connected with projector control equipment, the enabling end of the auxiliary circuit power supply module is connected with the input end of the sampling feedback module, the output end of the sampling feedback module is connected with the control end of the main circuit power supply module, and the feedback end of the sampling feedback module is connected with the control end of the switch driving module.
In an optional embodiment, the switch driving module includes a primary rectifying and filtering unit and a switch control unit;
the input end of the primary rectification filter unit is connected with the alternating current power supply equipment, the output end of the primary rectification filter unit is connected with the input end of the switch control unit, and the output end of the switch control unit is connected with the input end of the main circuit power supply module.
In an optional embodiment, the primary rectification filtering unit includes an RC filter and a full-wave rectifier connected in sequence.
In an optional embodiment, the switch control unit comprises a PWM switch control chip with model LD 7575.
In an optional embodiment, the main circuit power supply module includes a step-down transformer, a secondary rectification filter circuit, and a negative switch tube;
the main circuit power supply module is provided with a lamp bead connection interface;
the primary coil of the step-down transformer is connected with the output end of the switch control unit, the secondary coil of the step-down transformer is connected with the input end of the secondary rectification filter circuit, the positive output end of the secondary rectification filter circuit is connected with the positive end on the lamp bead connecting interface, and the negative output end of the secondary rectification filter circuit is connected with the negative end on the lamp bead connecting interface through the negative switch tube.
In an optional embodiment, the auxiliary power supply module includes a DC-DC conversion chip with a model number XL 4013;
the auxiliary circuit power supply module is provided with an equipment connecting interface, the input end of the DC-DC conversion chip is connected with the positive output end of the secondary rectification filter circuit, and the output end of the DC-DC conversion chip is connected with the positive end of the equipment connecting interface.
In an optional implementation manner, the sampling feedback module includes a lamp bead power supply control unit and a signal feedback control unit;
the input end of the lamp bead power supply control unit is connected with the enabling end on the equipment connecting interface, and the output end of the lamp bead power supply control unit is connected with the control end of the negative switch tube;
the input end of the signal feedback control unit is connected with the output end of the negative switch tube, and the feedback end of the signal feedback control unit is connected with the control end of the switch control unit.
In an alternative embodiment, the signal feedback control unit includes an operational amplifier chip of model LM 358.
The embodiment of the utility model provides an in, can realize the circular telegram control to high-power LED lamp pearl through setting up sampling feedback module, and utilize its feedback function can realize the output signal regulation and control to switch drive module to the self power supply demand of real-time response main road power module and auxiliary power module, save the power consumption cost by a wide margin, compare in traditional lamp pearl not cut off the power supply operation, be favorable to guaranteeing that it is long when the effective use of lamp pearl possesses better practicality.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a power control circuit of a projector according to an embodiment of the present invention;
fig. 2 is a specific design diagram of a power control circuit of a projector according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic diagram illustrating a power control circuit of a projector according to an embodiment of the present invention.
As shown in fig. 1, a power control circuit of a projector includes a switch driving module, a main circuit power supply module, a sampling feedback module, and an auxiliary circuit power supply module; basically, the input end of the switch driving module is connected with an alternating current power supply device, the output end of the switch driving module is connected with the input end of the main circuit power supply module, and the output end of the main circuit power supply module is connected with the LED lamp bead; the output end of the main circuit power supply module is connected with the input end of the auxiliary circuit power supply module, the output end of the auxiliary circuit power supply module is connected with projector control equipment, the enabling end of the auxiliary circuit power supply module is connected with the input end of the sampling feedback module, the output end of the sampling feedback module is connected with the control end of the main circuit power supply module, and the feedback end of the sampling feedback module is connected with the control end of the switch driving module.
In the embodiment of the present invention, the switch driving module is used for outputting an electric signal for safely getting electricity and stably controlling to the ac power supply device to the main circuit power supply module; the main circuit power supply module is used for performing steady-state constant current power supply on the LED lamp beads; the auxiliary circuit power supply module is used for realizing a voltage reduction function to complete normal power supply of the projector control equipment or the projector audio output equipment; the sampling feedback module is used for controlling the power supply state of the main circuit power supply module to the LED lamp beads and feeding the power supply state back to the switch driving module so as to control the specific power supply mode of the whole circuit.
Referring to fig. 2, fig. 2 shows a specific design diagram of a power control circuit of a projector according to an embodiment of the present invention, and the following description can be performed on each module in fig. 1:
further, the switch driving module includes a primary rectifying and filtering unit and a switch control unit, and an input end of the primary rectifying and filtering unit is connected to the ac power supply device (its interface is CON1), an output end of the primary rectifying and filtering unit is connected to an input end of the switch control unit, and an output end of the switch control unit is connected to an input end of the main circuit power supply module.
Specifically, the primary rectifying and filtering unit comprises an RC filter and a full-wave rectifier BD1 which are connected in sequence, wherein the RC filter is composed of a resistor R1, a resistor R2 and a capacitor CX1, a basic filtering function can be realized by the RC filter, and a basic rectifying function can be realized by the full-wave rectifier BD 1. In addition, an excitation coil LF1 is further provided on a connection wire between the RC filter and the full-wave rectifier BD1, so that a function of suppressing common mode interference can be realized, and an input protection function for the switching control unit can be performed.
Specifically, the switch control unit comprises a PWM switch control chip U2 with model LD7575, and the chip U2 can adaptively turn on a power-saving operation mode, has the characteristics of high performance, low power consumption, low cost and the like, and simultaneously provides protection functions such as overvoltage and overload. In the implementation process, the HV pin based on the chip U2 is connected to the positive terminal of a large capacitor EC1 through a resistor R4 and a resistor R3 to provide starting current for the chip U2; based on the fact that the chip U2 is in a working state, the PWM waveform output by the GATE pin is regulated according to the control signal fed back by the FB pin of the chip U2 to control the on-time and the on-time of the switching tube Q2, so as to adjust the power supply signal of the main circuit power supply module, which is specifically represented as: (1) when a switch control part U1B of the photoelectric coupler is in a conducting state, the FB pin is at a low level, and at the moment, the chip U2 acquires that the main circuit power supply module continues to supply power to the LED lamp bead and the auxiliary circuit power supply module continues to supply power to the projector control equipment, and then the PWM waveform is adjusted to control the whole circuit to operate in a double power supply mode; (2) when the switch control part U1B of the photoelectric coupler is in an off state, the FB pin is at a high level, and at this time, the chip U2 obtains that the main circuit power supply module stops supplying power to the LED lamp bead and the auxiliary circuit power supply module continues supplying power to the projector control device, and then adjusts the PWM waveform to control the entire circuit to operate in the single power supply mode.
Further, the main circuit power supply module comprises a step-down transformer T1, a secondary rectification filter circuit and a negative switch tube Q4, and the main circuit power supply module is provided with a lamp bead connection interface CON 2; basically, the primary coil of the step-down transformer T1 is connected to the output end of the switch control unit, the secondary coil of the step-down transformer T1 is connected to the input end of the secondary rectification filter circuit, the positive output end of the secondary rectification filter circuit is connected to the positive LED + on the bead connection interface CON2, and the negative output end of the secondary rectification filter circuit is connected to the negative LED-on the bead connection interface CON2 through the negative switch tube Q4.
In an implementation process, for the input end of the main circuit power supply module, a primary coil of the step-down transformer T1 generates a power-on loop depending on the switching tube Q2 being in a conducting state, so that a positive voltage is generated in the positive end LED +; for the output end of the main circuit power supply module, the lamp bead connection interface CON2 generates a power-on loop depending on that the negative switch tube Q4 is in a conducting state, so that the LED lamp bead can be powered by being butted with the lamp bead connection interface CON 2.
Furthermore, the auxiliary circuit power supply module includes a DC-DC conversion chip U3 with a model of XL4013, and the auxiliary circuit power supply module is provided with an equipment connection interface CON3, an input end of the DC-DC conversion chip U3 is connected with an anode output end (which provides a positive voltage LED +) of the secondary rectification filter circuit, and an output end of the DC-DC conversion chip U3 is connected with an anode end V + on the equipment connection interface CON 3. In an implementation process, the projector control device may take power by interfacing with the device connection interface CON3 by using a direct current voltage reduction function of the DC-DC conversion chip U3.
Furthermore, the sampling feedback module comprises a lamp bead power supply control unit and a signal feedback control unit; the input end of the lamp bead power supply control unit is connected with an enable end ENA on the equipment connection interface CON3, and the output end of the lamp bead power supply control unit is connected with the control end of the negative switch tube Q4; the input end of the signal feedback control unit is connected with the output end of the negative switch tube Q4, and the feedback end of the signal feedback control unit is connected with the control end of the switch control unit.
Specifically, the lamp bead power supply control unit comprises a switching tube Q6 and a PNP triode Q5; in an implementation process, based on the docking state of the projector control device and the device connection interface CON3, the projector control device sends an enable control signal to an enable terminal ENA of the device connection interface CON3 to artificially control whether the lamp bead connection interface CON2 generates a power-on loop, which is specifically represented as: when the enable control signal is at a high level, triggering both the switching tube Q6 and the PNP triode Q5 to be in a conducting state, so that the negative switching tube Q4 is in a conducting state, and at this time, the lamp bead connection interface CON2 generates a power-on loop; on the contrary, when the enable control signal is at a low level, the lamp bead connection interface CON2 cannot generate a power-on loop.
Specifically, the signal feedback control unit comprises an operational amplifier chip U5 with model number LM358, an IN1(+) pin of the chip U5 is connected with an output end (S pole) of the negative switch tube Q4 through a resistor R39, an IN1(-) pin of the chip U5 is connected with an a terminal, an OUT1 pin of the chip U5 is connected with a light emitting driving part U1A of the photocoupler through a diode D6 and a resistor R34, wherein the a terminal voltage is used as a comparison reference value of the chip U5, and is a voltage division result of a parallel resistor R24// R27 on a positive voltage LED +. The specific implementation process is as follows: (1) when the negative switch tube Q4 is IN a conducting state, the IN1(+) pin extracts a current voltage value when the lamp bead connection interface CON2 generates a power-on loop, and according to the current voltage value being greater than the voltage of the a terminal, the OUT1 pin outputs a positive voltage LED + to enable the light-emitting driving part U1A of the photoelectric coupler to be IN a light-emitting state, so that the switch control part U1B of the photoelectric coupler is conducted; (2) when the negative switching tube Q4 is IN an off state, the IN1(+) pin will receive a ground signal, and at this time, 0V is output through the OUT1 pin to keep the light-emitting driving portion U1A of the photocoupler inoperative, thereby turning off the switch control portion U1B of the photocoupler.
The embodiment of the utility model provides an in, can realize the circular telegram control to high-power LED lamp pearl through setting up sampling feedback module, and utilize its feedback function can realize the output signal regulation and control to switch drive module to the self power supply demand of real-time response main road power module and auxiliary power module, save the power consumption cost by a wide margin, compare in traditional lamp pearl not cut off the power supply operation, be favorable to guaranteeing that it is long when the effective use of lamp pearl possesses better practicality.
The above detailed description is made on the projector power control circuit provided by the embodiment of the present invention, and the detailed examples are adopted herein to explain the principle and the implementation manner of the present invention, and the description of the above embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.
Claims (8)
1. A projector power supply control circuit is characterized in that the control circuit comprises a switch driving module, a main circuit power supply module, a sampling feedback module and an auxiliary circuit power supply module; wherein the content of the first and second substances,
the input end of the switch driving module is connected with an alternating current power supply device, the output end of the switch driving module is connected with the input end of the main circuit power supply module, and the output end of the main circuit power supply module is connected with the LED lamp bead;
the output end of the main circuit power supply module is connected with the input end of the auxiliary circuit power supply module, the output end of the auxiliary circuit power supply module is connected with projector control equipment, the enabling end of the auxiliary circuit power supply module is connected with the input end of the sampling feedback module, the output end of the sampling feedback module is connected with the control end of the main circuit power supply module, and the feedback end of the sampling feedback module is connected with the control end of the switch driving module.
2. The projector power control circuit according to claim 1, wherein the switch driving module comprises a primary rectifying and filtering unit and a switch control unit;
the input end of the primary rectification filter unit is connected with the alternating current power supply equipment, the output end of the primary rectification filter unit is connected with the input end of the switch control unit, and the output end of the switch control unit is connected with the input end of the main circuit power supply module.
3. The projector power supply control circuit according to claim 2, wherein the primary rectification filter unit includes an RC filter and a full-wave rectifier connected in series.
4. The projector power control circuit according to claim 2, wherein the switching control unit includes a PWM switching control chip of model LD 7575.
5. The projector power control circuit according to claim 2, wherein the main circuit power supply module comprises a step-down transformer, a secondary rectification filter circuit and a negative switch tube;
the main circuit power supply module is provided with a lamp bead connection interface;
the primary coil of the step-down transformer is connected with the output end of the switch control unit, the secondary coil of the step-down transformer is connected with the input end of the secondary rectification filter circuit, the positive output end of the secondary rectification filter circuit is connected with the positive end on the lamp bead connecting interface, and the negative output end of the secondary rectification filter circuit is connected with the negative end on the lamp bead connecting interface through the negative switch tube.
6. The projector power supply control circuit as claimed in claim 5, wherein the auxiliary power supply module comprises a DC-DC conversion chip with model number XL 4013;
the auxiliary circuit power supply module is provided with an equipment connecting interface, the input end of the DC-DC conversion chip is connected with the positive output end of the secondary rectification filter circuit, and the output end of the DC-DC conversion chip is connected with the positive end of the equipment connecting interface.
7. The projector power control circuit of claim 6, wherein the sampling feedback module comprises a lamp bead power supply control unit and a signal feedback control unit;
the input end of the lamp bead power supply control unit is connected with the enabling end on the equipment connecting interface, and the output end of the lamp bead power supply control unit is connected with the control end of the negative switch tube;
the input end of the signal feedback control unit is connected with the output end of the negative switch tube, and the feedback end of the signal feedback control unit is connected with the control end of the switch control unit.
8. The projector power control circuit as claimed in claim 7, wherein the signal feedback control unit comprises an operational amplifier chip of model LM 358.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120252534.9U CN214228513U (en) | 2021-01-28 | 2021-01-28 | Projector power supply control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120252534.9U CN214228513U (en) | 2021-01-28 | 2021-01-28 | Projector power supply control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN214228513U true CN214228513U (en) | 2021-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120252534.9U Active CN214228513U (en) | 2021-01-28 | 2021-01-28 | Projector power supply control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214228513U (en) |
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2021
- 2021-01-28 CN CN202120252534.9U patent/CN214228513U/en active Active
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