CN108322964A - LED drive power circuit - Google Patents
LED drive power circuit Download PDFInfo
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- CN108322964A CN108322964A CN201810286053.2A CN201810286053A CN108322964A CN 108322964 A CN108322964 A CN 108322964A CN 201810286053 A CN201810286053 A CN 201810286053A CN 108322964 A CN108322964 A CN 108322964A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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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
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Abstract
The invention discloses a kind of LED drive power circuits comprising dimming unit, control unit, communication unit and power supply unit, dimming unit are used to receive the first dim signal of light modulator transmission and are filtered；Control unit is connect with the dimming unit, for exporting the second dim signal to supply voltage according to first dim signal to be dimmed, and for being communicated the corresponding feedback signal of programming signal output to be sent according to the cd-rom recorder with cd-rom recorder；Communication unit is connect with described control unit, and the feedback signal back for exporting described control unit gives the cd-rom recorder；And power supply unit is connect with described control unit, for being powered to described control unit；Wherein, the dimming unit, control unit, power supply unit and communication unit are connected to a multiplex interface so that the light modulator or the cd-rom recorder connect.Interface and connecting line can be saved, cost, optimizing structure design are reduced.
Description
Technical field
The present invention relates to power electronics field more particularly to a kind of LED drive power circuits.
Background technology
As science and technology and expanding economy, LED have been widely applied in the daily life of people, LED has energy saving, ring
Protect, the advantages that service life is long and luminous efficiency is high, and LED drive power circuit as LED energy source in LED technology
Field occupies very important status.Usual LED drive power circuit has dimming function and programmable functions, dimming function tool
Body refers to the dimming interface connection of light modulator and LED drive power circuit, and it is defeated to change power supply by voltage or change in duty cycle
Go out electric current, to be dimmed to LED lamp；Programing function specifically refers to cd-rom recorder and passes through the volume with LED drive power circuit
Journey interface is connected and can be programmed.So light modulator and cd-rom recorder and LED lamp drive electricity by two core wires and LED respectively
Source circuit connects, and LED drive power circuit will at least draw three two core wires.This will lead to the cost of LED drive power circuit
Therefore increase, and the size of structure design and difficulty increase, and directly affect the installation and use of user, be not suitable with power supply with
The development trend of lamps and lanterns miniaturization.
Invention content
The embodiment of the present invention provides a kind of LED drive power circuit, it is intended to solve LED drive power circuit in the prior art
The technical issues of needing to draw at least three two core wires when realizing dimming function and programmable functions.
An embodiment of the present invention provides a kind of LED drive power circuits comprising dimming unit, control unit, communication are single
Member and power supply unit, the dimming unit are used to receive the first dim signal of light modulator transmission and are filtered；Institute
It states control unit to connect with the dimming unit, for exporting the second dim signal to electricity of powering according to first dim signal
Pressure is used to be communicated with cd-rom recorder corresponding anti-with the programming signal output sent according to the cd-rom recorder to be dimmed
Feedback signal；The communication unit is connect with described control unit, the feedback signal back for exporting described control unit to
The cd-rom recorder；And said supply unit is connect with described control unit, for being powered to described control unit；Its
In, the dimming unit, control unit, power supply unit and communication unit are connected to a multiplex interface for the light modulator
Or the cd-rom recorder connection.
Further, said supply unit includes level-one power supply subelement, two level power supply subelement and three-level supplied for electronic
Unit, the level-one power supply subelement, two level power supply subelement and three-level power supply subelement mutually connect, when
When the multiplex interface connects the light modulator, the supply voltage is powered by level-one power supply subelement and the two level
Subelement is powered described control unit；When the multiplex interface connects the cd-rom recorder, the cd-rom recorder passes through institute
It states level-one power supply subelement and two level power supply subelement is powered described control unit；When the multiplex interface is hanging
When, the supply voltage supplies described control unit by level-one power supply subelement and two level power supply subelement
Electricity, the three-level power supply subelement export third dim signal to the multiplex interface.
Further, level-one power supply subelement include the second triode, the second diode, the first zener diode,
6th capacitance, the 7th capacitance and twelfth resistor；The anode of second diode is connect with the supply voltage, described
The cathode of second diode is connect with the collector of second triode, the base stage connection described first of second triode
The cathode of zener diode, the plus earth of first zener diode, the cathode of second diode and described first
6th capacitance in parallel and the 7th capacitance, the collector and base of second diode between the anode of zener diode
It is connected with the twelfth resistor between pole, the emitter of second diode is powered the output of subelement as the level-one
End is connected to the input terminal of the input terminal and three-level power supply subelement of the two level power supply subelement.
Further, said supply unit further includes the first diode, and the anode of first diode is connected to described
The cathode of multiplex interface, the diode is connected to the level-one power supply subelement.
Further, two level power supply subelement include the 28th resistance, the second voltage stabilizing element, the 5th triode,
14th resistance, the 17th resistance and the 5th capacitance；The collector of 5th triode is as the two level supplied for electronic list
The input terminal of member connects the input terminal of the output end and three-level power supply subelement of level-one power supply subelement, and the described 5th
The base stage of triode is grounded through second voltage stabilizing element, is connected between the collector and base stage of the 5th triode described
28th resistance, the 14th resistance and the 17th resistance are in parallel with the 5th capacitance after being serially connected, described
5th capacitance one end is grounded, and the other end is connected to the emitter of the 5th triode, and the emitter of the 5th triode is made
Output end for two level power supply subelement is connected to described control unit to be powered to it.
Further, second voltage stabilizing element is TL431 chips, the cathode connection described the of second voltage stabilizing element
The reference pole of the base stage of five triodes, the plus earth of second voltage stabilizing element, second zener diode is connected to institute
It states between the 14th resistance and the 17th resistance.
Further, three-level power supply subelement includes thirteenth resistor, third voltage stabilizing element, the 4th diode, the
20 resistance, the 21st resistance and the 24th resistance；One end of the thirteenth resistor is as the three-level supplied for electronic
The input terminal of unit and with the level-one power subelement output end and the two level power subelement input terminal connect, institute
The other end for stating thirteenth resistor is grounded through the third voltage stabilizing element, and the anode of the 4th diode is connected to the third
Between voltage stabilizing element and the thirteenth resistor, the cathode of the 4th diode is through the 20th resistance and the described 20th
Four resistance eutral groundings, one end of the 21st resistance be connected to the 4th diode cathode and the 20th resistance it
Between, the other end of the 21st resistance connects the multiplex interface.
Further, the third voltage stabilizing element is TL431 chips, the cathode connection described the of the third voltage stabilizing element
The reference level of 13 resistance, the plus earth of the third voltage stabilizing element, the third voltage stabilizing element is connected to the described 20th
Between resistance and the 24th resistance.
Further, the dimming unit includes the 7th resistance, the 8th resistance, the 9th resistance, the second capacitance and third
Capacitance；One end of 8th resistance connects the multiplex interface, and the other end passes through the 7th resistance and described control unit
Connection；One end is connected between the 7th resistance and the 8th resistance after 9th resistance is in parallel with third capacitance, separately
One end is grounded；One end of second capacitance is connected between the 7th resistance and described control unit, second capacitance
The other end ground connection.
Further, the communication unit include third diode, third transistor, the 4th triode, the 15th resistance,
18th resistance, the 19th resistance and the 22nd resistance；The anode of the third diode connects the multiplex interface, institute
The cathode for stating third diode connects the collector of the 4th triode, and the emitter ground connection of the 4th triode is described
The 22nd resistance is connected between the base stage and emitter of 4th triode, the base stage of the 4th triode passes through institute
The collector that the 19th resistance connects the third transistor is stated, is connected between the emitter and base stage of the third transistor
The base stage of 15th resistance, the third triode connects described control unit by the 18th resistance.
Compared with prior art, the beneficial effects of the invention are as follows：The present invention is by by dimming unit, control unit, power supply
Unit and communication unit are connected to a multiplex interface so that light modulator or cd-rom recorder connect so that light modulator and cd-rom recorder can
Dimming function and programing function are realized to share an interface, saves interface and connecting line, reduces cost, and optimization structure is set
Meter.
Description of the drawings
Technical solution in order to illustrate the embodiments of the present invention more clearly, below will be to needed in embodiment description
Attached drawing is briefly described, it should be apparent that, drawings in the following description are some embodiments of the invention, general for this field
For logical technical staff, without creative efforts, other drawings may also be obtained based on these drawings.
Fig. 1 is the frame principle figure of LED drive power circuit provided in an embodiment of the present invention；
Fig. 2 illustrates the electrical block diagram of LED drive power circuit provided in an embodiment of the present invention；
Fig. 3 is the frame principle figure of power supply unit in LED drive power circuit provided in an embodiment of the present invention；
Fig. 4 illustrates the connection diagram of LED drive power circuit practical application provided in an embodiment of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
It should be appreciated that ought use in this specification and in the appended claims, term " comprising " and "comprising" instruction
Described feature, entirety, step, operation, the presence of element and/or component, but one or more of the other feature, whole is not precluded
Body, step, operation, element, component and/or its presence or addition gathered.
It is also understood that the term used in this description of the invention is merely for the sake of the mesh for describing specific embodiment
And be not intended to limit the present invention.As description of the invention and it is used in the attached claims, unless on
Other situations are hereafter clearly indicated, otherwise " one " of singulative, "one" and "the" are intended to include plural form.
It will be further appreciated that the term "and/or" used in description of the invention and the appended claims is
Refer to any combinations and all possible combinations of one or more of associated item listed, and includes these combinations.
Referring to Fig.1, an embodiment of the present invention provides a kind of LED drive power circuits 100 comprising dimming unit 110, control
Unit 120, power supply unit 140 and communication unit 130 processed, described control unit 120 can be used control chip and realize, the control
Unit 120 processed is connect with the dimming unit 110, said supply unit 140 and the communication unit 130 simultaneously.Wherein, institute
Dimming unit 110 is stated to be used to receive the first dim signal of the transmission of light modulator 200 and be filtered；Described control unit
120 are used for according to first dim signal the second dim signal of output to supply voltage to be dimmed, described control unit
120 are additionally operable to be communicated the corresponding feedback letter of programming signal output to be sent according to the cd-rom recorder 300 with cd-rom recorder 300
Number；The feedback signal back that the communication unit 130 is used to export described control unit 120 gives the cd-rom recorder 300；It is described
Power supply unit 140 to described control unit 120 for being powered；Wherein, the dimming unit 110, control unit 120, confession
Electric unit 140 and communication unit 130 are connected to a multiplex interface so that the light modulator 200 or the cd-rom recorder 300 connect
It connects.By designing above, the light modulator 200 and the cd-rom recorder 300 can pass through multiplex interface and described control unit 120
Connection so that light modulator 200 and cd-rom recorder 300 can share an interface to realize dimming function and programing function, save
Interface and connecting line reduce cost, optimizing structure design.
With reference to Fig. 2, Fig. 3, in one embodiment, such as in the present embodiment, said supply unit 140 includes level-one supplied for electronic
Unit 141, two level power supply subelement 142 and three-level power supply subelement 143, the level-one power supply subelement 141, the two level
Power supply subelement 142 and three-level power supply subelement 143 homogeneously connect, circuit shown in the multiplex interface corresponding diagram 2
DIM+ pins in figure, the supply voltage that the supply voltage is provided by the power supply mainboard of LED drive power, the supply voltage
DVCC pins in circuit diagram described in corresponding diagram 2, when the multiplex interface connects the light modulator 200, by supply voltage
DVCC is powered to described control unit 120.Specifically, the supply voltage DVCC passes through level-one power supply subelement
141 output 15v DC voltages, the reference dc voltage that 5V is exported using two level power supply subelement 142 come to the control
Unit 120 processed is powered.When the multiplex interface is hanging, the supply voltage DVCC passes through level-one power supply subelement
141 and two level power supply subelement 142 described control unit 120 is powered, three-level power supply subelement 143 exports
Third dim signal is to the multiplex interface, and specifically, the third dim signal is 10V so that described control unit 120 is defeated
Go out the dim signal of 100% duty ratio so that LED light most light.Existing LED drive power circuit is when using programing function
Need to build test environment, need be equipped with AC power, power meter, LED lamp load etc., to simulate true use condition to
LED drive power circuit is powered, and ensures that the power supply of the light-adjusting module inside LED drive power circuit could normally realize programming work(
Can, operating environment requirements are high, and cumbersome, working efficiency is low.And the present invention may be implemented not needing external power supply power supply
Programing function is completed, realizes the programming of off-line type, specifically, when supply voltage is 0V, by the cd-rom recorder 300 to the control
Unit 120 is powered, and when the multiplex interface connects the cd-rom recorder 300, the cd-rom recorder 300 inputs programming signal,
The serial ports pulse signal that the programming signal is 0 to 10V, the programming signal that the cd-rom recorder 300 inputs pass through the first diode
D1 enters the level-one power supply subelement 141 and two level power supply subelement 142 exports the reference dc voltage of 5V voltage stabilizings
To be powered to described control unit 120.
In one embodiment, such as in the present embodiment, level-one power supply subelement 141 includes the second triode Q2, the
Two diode D2, the first zener diode ZD1, the 6th capacitance C6, the 7th capacitance C7 and twelfth resistor R12；Described second
The anode of diode D2 is connect with the supply voltage, the collection of the cathode of the second diode D2 and the second triode Q2
Electrode connects, and the base stage of the second triode Q2 connects the cathode of the first zener diode ZD1, first voltage stabilizing two
The plus earth of pole pipe ZD1, it is in parallel between the cathode of the second diode D2 and the anode of the first zener diode ZD1
The 6th capacitance C6 and the 7th capacitance C7 is connected with described between the collector and base stage of the second three-level pole pipe Q2
Output end connection of the emitter of twelfth resistor R12, the second three-level pole pipe Q2 as level-one power supply subelement 141
To the input terminal of the input terminal and three-level power supply subelement 143 of two level power supply subelement 142, specifically, described the
Two triode Q2 manage for NPN.
In one embodiment, such as in the present embodiment, two level power supply subelement 142 include the 28th resistance R28,
Second voltage stabilizing element U2, the 5th triode Q5, the 14th resistance R14, the 17th resistance 417 and the 5th capacitance C5, described
The collector of five triode Q5 connects the level-one power supply subelement 141 as the input terminal of two level power supply subelement 142
Output end and the three-level power supply subelement 143 input terminal, the base stage of the 5th triode Q5 is through second voltage stabilizing
Element U2 ground connection, is connected with the 28th resistance R28 between the collector and base stage of the 5th triode Q5, and the described 14th
Resistance R14 and the 17th resistance R17 is in parallel with the 5th capacitance C5 after being serially connected, the 5th capacitance C5 mono- terminations
Ground, the other end are connected to the emitter of the 5th triode Q5, and the emitter of the 5th triode Q5 is as the two level
The output end of power supply subelement 142 is connected to described control unit 120 to be powered to it, specifically, second voltage stabilizing
Element U2 is TL431 chips, and the cathode of the second voltage stabilizing element U2 connects the base stage of the 5th triode Q5, described second
The plus earth of voltage stabilizing element U2, the reference pole of the second voltage stabilizing element U2 are connected to the 14th resistance R14 and described
Between 17th resistance R17, specifically, the 5th triode Q5 manages for NPN, it is of course possible to which understanding, described second is steady
Pressure element U2 can also can realize the element of linear voltage stabilization for other.
In one embodiment, such as in the present embodiment, three-level power supply subelement 143 includes thirteenth resistor R13, the
Three voltage stabilizing element U3, the 4th diode D4, the 20th resistance R20, the 21st resistance R21 and the 24th resistance R24, institute
State one end of thirteenth resistor R13 as the three-level power subelement 143 input terminal and power subelement with the level-one
The power input terminal of subelement 142 of output end 141 and the two level connect, the other end of the thirteenth resistor R13 is through institute
Third voltage stabilizing element U3 ground connection is stated, the anode of the 4th diode D4 is connected to the third voltage stabilizing element U3 and the described tenth
Between three resistance R13, the cathode of the 4th diode D4 is through the 20th resistance R20 and the 24th resistance R24
One end of ground connection, the 21st resistance R21 is connected to the cathode of the 4th diode D4 and the 20th resistance R20
Between, the other end of the 21st resistance R21 connects the multiplex interface, and specifically, the third voltage stabilizing element U3 is
The cathode of TL431 chips, the third voltage stabilizing element U3 connects the thirteenth resistor R13, the third voltage stabilizing element U3's
The reference level of plus earth, the third voltage stabilizing element U3 is connected to the 20th resistance R20 and the 24th resistance
Between R24, it is of course possible to which understanding, the third voltage stabilizing element U3 can also can realize the element of linear voltage stabilization for other.
In one embodiment, such as in the present embodiment, the dimming unit 110 include the 7th resistance R7, the 8th resistance R8,
9th resistance R9, the second capacitance C2 and third capacitance C3；The termination multiplex interfaces of the 8th resistance R8 even, it is another
End is connect by the 7th resistance R7 with described control unit 120, and the 9th resistance R9 is in parallel with third capacitance C3 latter
End is connected between the 7th resistance R7 and the 8th resistance R8, and one end of other end ground connection, the second capacitance C2 connects
It is connected between the 7th resistance R7 and described control unit 120, the other end ground connection of the second capacitance C2.
In one embodiment, such as in the present embodiment, the communication unit 130 includes third diode D3, the three or three pole
Pipe Q3, the 4th triode Q4, the 15th resistance R15, the 18th resistance R18, the 19th resistance R19 and the 22nd resistance
R22；The anode of the third diode D3 connects the multiplex interface, the cathode connection the described 4th of the third diode D3
The collector of triode Q4, the emitter ground connection of the 4th triode Q4, the base stage and emitter of the 4th triode Q4
Between be connected with the 22nd resistance R22, the base stage of the 4th triode Q4 passes through the 19th resistance R19 connections
The collector of the third transistor Q3 is connected with the 15th electricity between the emitter and base stage of the third transistor Q3
Hinder R15, the base stage of the third triode Q3 by the TX pins of the 18th resistance R18 connections described control unit 120,
Specifically, the third transistor Q3 is PNP pipe, and the 4th triode Q4 manages for NPN.
Operation principle of the detailed description below present invention under each state：
When light modulation, the multiplex interface connects the light modulator 200, and the light modulator 200 inputs the first light modulation letter
Number arrive the dimming unit 110, first dim signal be 0 to 10V analog signal, the dimming unit 110 receive institute
Output is to described control unit 120, the control after stating the first dim signal and being filtered to first dim signal
Unit 120 processed exports the second dim signal for stablizing duty ratio by programmed algorithm to the supply voltage to be dimmed.Example
Such as, when first dim signal is 1V, described control unit 120 is by first dim signal by modulus variation output
The second dim signal that duty ratio is 10%, amplitude is 5V is to reduce the brightness of LED light；When first dim signal is 10V
When, described control unit 120 by first dim signal by modulus variation output duty cycle be 100%, amplitude is 5V's
Second dim signal is to increase the brightness of LED light；Second dim signal is pwm signal.By the confession in dimming process
Piezoelectric voltage DVCC is powered for described control unit, and specifically, the supply voltage passes through level-one power supply subelement 141
15v DC voltages are exported, exporting 5V DC voltages using two level power supply subelement 142 comes to described control unit 120
It is powered.
When programming, the multiplex interface connects the cd-rom recorder 300, and the cd-rom recorder 300 inputs programming signal described in
Control unit 120, the programming signal are the 0 serial ports pulse signal for arriving 10V, and the programming signal is through 3rd resistor R3 and the 5th
The programming signal is input to the RX feet of described control unit 120, the TX feet of described control unit 120 are defeated after resistance R5 partial pressures
Go out feedback signal to the communication unit 130, the feedback signal returns to the cd-rom recorder 300 through the communication unit 130.
For example, when the TX feet of described control unit are 0V, Q3, the emitter of the third transistor Q3 is connected in the third transistor
Current potential be the 5V provided by reference voltage high level, by the 19th resistance R19 and the 22nd resistance R22
The 4th triode Q4 is connected after partial pressure, since the voltage that the reseting interface is connected of the 4th triode Q4 is by under
It draws, exports a low level feedback signal to the cd-rom recorder 300；When the TX feet of described control unit are 5V, institute
Third transistor Q3 cut-offs are stated, so that the 4th triode Q4 is also switched off, the three-level power supply subelement 143 passes through at this time
The 21st resistance R21 exports the feedback signal of high level to the cd-rom recorder 300.In short, described control unit
120 receive the programming signal by RX feet and export the feedback signal by TX feet to be carried out with the cd-rom recorder 300
Communication.In programming process, described control unit 120 can complete programming when no external power supply is powered, and realize the volume of off-line type
Journey specifically when supply voltage is 0V, is powered described control unit 120 by the cd-rom recorder 300, when the multiplexing
When interface connects the cd-rom recorder 300, the cd-rom recorder 300 inputs programming signal, the serial ports that the programming signal is 0 to 10V
Pulse signal, the programming signal that the cd-rom recorder 300 inputs enter the level-one power supply subelement 141 by the first diode
The reference dc voltage of 5V voltage stabilizings is exported with two level power supply subelement 142 to be powered to described control unit 120.
When hanging, the multiplex interface is hanging, and described control unit 120 passes through the level-one by the supply voltage DVCC
Power supply subelement 141 and two level power supply subelement 142 are powered, the subelement 143 of three-level power supply at this time output the
Three dim signals are to the multiplex interface, and specifically, the third dim signal is 10V, and described control unit 120 detects institute
The current potential for stating multiplex interface is 10V so that described control unit 120 exports the dim signal of 100% duty ratio by LED light tune
To most light.
With reference to Fig. 4, which show the connection signals in practical applications of LED drive power circuit of the embodiment of the present invention
Figure, including LED drive power circuit 100, light modulator 200, cd-rom recorder 300 and LED lamp 400, the LED drive power electricity
Road 100 is the LED drive power circuit 100 in above example, and the input terminal connection of the LED drive power circuit 100 is handed over
The output end in galvanic electricity source, the LED drive power circuit 100 connects the LED lamp 400, the light modulator 200 and the burning
Record device 300 is connect by multiplex interface with the LED drive power circuit 100, by designing above so that 200 He of light modulator
Cd-rom recorder 300 can share an interface to realize dimming function and programing function, save interface and connecting line, reduce at
This, optimizing structure design.
LED drive power circuit of the present invention is by connecting dimming unit, control unit, power supply unit and communication unit
A multiplex interface is connected to so that light modulator or cd-rom recorder connect so that light modulator and cd-rom recorder can share an interface to realize
Dimming function and programing function, save interface and connecting line, reduce cost, optimizing structure design.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or replace
It changes, these modifications or substitutions should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with right
It is required that protection domain subject to.
Claims (10)
1. a kind of LED drive power circuit, which is characterized in that including：
Dimming unit, for receive light modulator transmission the first dim signal and be filtered；
Control unit, described control unit are connect with the dimming unit, for exporting second according to first dim signal
Dim signal to supply voltage to be dimmed, and for being communicated burning to be sent according to the cd-rom recorder with cd-rom recorder
Signal exports corresponding feedback signal；
Communication unit, the communication unit are connect with described control unit, the feedback signal for exporting described control unit
Feed back to the cd-rom recorder；And
Power supply unit, said supply unit are connect with described control unit, for being powered to described control unit；
Wherein, the dimming unit, control unit, power supply unit and communication unit are connected to a multiplex interface for described
Light modulator or cd-rom recorder connection.
2. LED drive power circuit according to claim 1, which is characterized in that said supply unit includes level-one power supply
Subelement, two level power supply subelement and three-level power supply subelement, the level-one power supply subelement, two level power supply subelement
And the three-level power supply subelement mutually connects,
When the multiplex interface connects the light modulator, the supply voltage passes through level-one power supply subelement and described two
Grade power supply subelement is powered described control unit；
When the multiplex interface connects the cd-rom recorder, the cd-rom recorder passes through level-one power supply subelement and the two level
Power supply subelement is powered described control unit；
When the multiplex interface is hanging, the supply voltage passes through level-one power supply subelement and the two level supplied for electronic list
Member is powered described control unit, and the three-level power supply subelement exports third dim signal to the multiplex interface.
3. LED drive power circuit according to claim 2, which is characterized in that level-one power supply subelement includes the
Two triodes, the second diode, the first zener diode, the 6th capacitance, the 7th capacitance and twelfth resistor；Described second
The anode of diode is connect with the supply voltage, and the cathode of second diode and the collector of second triode connect
It connects, the base stage of second triode connects the cathode of first zener diode, the anode of first zener diode
Ground connection, the 6th capacitance in parallel and described between the cathode of second diode and the anode of first zener diode
7th capacitance is connected with the twelfth resistor, second diode between the collector and base stage of second diode
Emitter be connected to the two level as the power output end of subelement of the level-one and power the input terminal of subelement and described
The input terminal of three-level power supply subelement.
4. LED drive power circuit according to claim 2, which is characterized in that said supply unit further includes the one or two
The anode of pole pipe, first diode is connected to the multiplex interface, and the cathode of the diode is connected to the level-one and supplies
Electronic unit.
5. LED drive power circuit according to claim 2, which is characterized in that two level power supply subelement includes the
28 resistance, the second voltage stabilizing element, the 5th triode, the 14th resistance, the 17th resistance and the 5th capacitance；Described 5th
The collector of triode as the two level power subelement input terminal connect the level-one power subelement output end and
The input terminal of three-level power supply subelement, the base stage of the 5th triode are grounded through second voltage stabilizing element, and described the
The 28th resistance, the 14th resistance and the 17th electricity are connected between the collector and base stage of five triodes
Resistance is in parallel with the 5th capacitance after being serially connected, and the 5th capacitance one end ground connection, the other end is connected to the five or three pole
The emitter of the emitter of pipe, the 5th triode is connected to the control as the output end of two level power supply subelement
Unit is to be powered it.
6. LED drive power circuit according to claim 5, which is characterized in that second voltage stabilizing element is TL431 cores
Piece, the cathode of second voltage stabilizing element connect the base stage of the 5th triode, the plus earth of second voltage stabilizing element,
The reference pole of second zener diode is connected between the 14th resistance and the 17th resistance.
7. LED drive power circuit according to claim 2, which is characterized in that three-level power supply subelement includes the
13 resistance, third voltage stabilizing element, the 4th diode, the 20th resistance, the 21st resistance and the 24th resistance；It is described
One end of thirteenth resistor as the three-level power subelement input terminal and with the level-one power subelement output end
It is connected with the input terminal of two level power supply subelement, the other end of the thirteenth resistor connects through the third voltage stabilizing element
The anode on ground, the 4th diode is connected between the third voltage stabilizing element and the thirteenth resistor, and the described 4th 2
The cathode of pole pipe is connected to through the 20th resistance and the 24th resistance eutral grounding, one end of the 21st resistance
Between the cathode and the 20th resistance of 4th diode, the other end of the 21st resistance connects the multiplexing
Interface.
8. LED drive power circuit according to claim 7, which is characterized in that the third voltage stabilizing element is TL431 cores
Piece, the cathode of the third voltage stabilizing element connect the thirteenth resistor, the plus earth of the third voltage stabilizing element, and described the
The reference level of three voltage stabilizing elements is connected between the 20th resistance and the 24th resistance.
9. LED drive power circuit according to claim 1, which is characterized in that the dimming unit include the 7th resistance,
8th resistance, the 9th resistance, the second capacitance and third capacitance；One end of 8th resistance connects the multiplex interface, separately
One end is connect by the 7th resistance with described control unit；One end is connected to after 9th resistance is in parallel with third capacitance
Between 7th resistance and the 8th resistance, other end ground connection；One end of second capacitance is connected to the 7th electricity
Between resistance and described control unit, the other end of second capacitance is grounded.
10. LED drive power circuit according to claim 1, which is characterized in that the communication unit includes the three or two pole
Pipe, third transistor, the 4th triode, the 15th resistance, the 18th resistance, the 19th resistance and the 22nd resistance；Institute
The anode for stating third diode connects the multiplex interface, and the cathode of the third diode connects the collection of the 4th triode
Electrode, the emitter ground connection of the 4th triode, is connected with described the between the base stage and emitter of the 4th triode
The base stage of 22 resistance, the 4th triode connects the collector of the third transistor by the 19th resistance,
The 15th resistance is connected between the emitter and base stage of the third transistor, the base stage of the third triode passes through
18th resistance connects described control unit.
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| CN114071837A (en) * | 2020-08-07 | 2022-02-18 | 全汉企业股份有限公司 | Lighting power supply circuit with dimming function and control method thereof |
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| CN108322964B (en) | 2023-09-08 |
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