CN209345423U - Multichannel dimming drive system - Google Patents
Multichannel dimming drive system Download PDFInfo
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- CN209345423U CN209345423U CN201821368134.9U CN201821368134U CN209345423U CN 209345423 U CN209345423 U CN 209345423U CN 201821368134 U CN201821368134 U CN 201821368134U CN 209345423 U CN209345423 U CN 209345423U
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Abstract
The utility model provides a kind of multichannel dimming drive system, and including light emitting source and for driving the light emitting source to realize the driving circuit of constant-current dimming control, the driving circuit includes rectification module, Power Factor Correction Control module and constant flow module；Rectification module is used to mains converting direct current and export；Half sine wave voltage of the Power Factor Correction Control module for exporting the rectification module exports after carrying out power factor adjustment processing and boosting steady pressure treatment to the positive terminal of the light emitting source；Constant flow module is used to receive external IIC dimming commands and generates corresponding constant current according to the IIC dimming commands and export to the negative pole end of the light emitting source.Compared with the relevant technologies, the achievable multichannel light modulation of the multichannel dimming drive system of the utility model, power factor are high and high-efficient.
Description
Technical field
The utility model relates to field of circuit technology more particularly to a kind of multichannel dimming drive systems.
Background technique
Currently, lamp bead for illumination using more and more extensive, especially LED lamp bead is more widely applied, and is such as used for
Daily indoor and outdoor lighting LED lamp is also just more more and more universal.LED lamp is with its high efficiency, low power consuming, energy conservation and environmental protection,
Many advantages, such as response is fast, long service life becomes the lighting source of a new generation.Traditional incandescent lamp and fluorescent lamp all may be used
It is dimmed with configuring light modulator, adjusts the output illuminance of light, to meet the needs of people.And the lamps and lanterns of lamp bead are used, especially
It is that simulation/PWM light modulation chip and its peripheral circuit is generally used to be dimmed using the LED lamp of LED lamp bead.
As shown in Figure 1, the simulation of the relevant technologies/PWM light modulation chip and its peripheral circuit scheme generally include fuse F1,
First diode D1, the second diode D2, third diode D3, the 4th diode 4, first capacitor C1, varistor R3, mould
Quasi-/PWM light modulation chip U1, LED lamp bead and chip periphery circuit；The chip periphery circuit includes inductance L1, first resistor
R1, second resistance R2, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the second capacitor C2, third capacitor C3, the 4th capacitor
C4, the 5th capacitor C5, the 5th diode D5, the 6th diode D6, the 7th diode D7, transformer T1 and the first transistor
M1.The working principle of the program are as follows: the input port of the program is connected to alternating current and obtains 220V alternating current, which passes through
After the concatenated fuse F1, the varistor R3 in parallel；Using by the diode D1, the second diode D2,
The rectifier bridge of third diode D3 and the 4th diode 4 composition is rectified；And it is filtered by the first capacitor C1
And pressure stabilizing；Voltage output by pressure stabilizing is to simulation/PWM light modulation chip U1, the chip periphery circuit and transformer
The primary of T1 is as input voltage.Output voltage of the secondary output one of the transformer T1 close to 100V；Pass through series connection institute
After stating the 6th diode D6；And process the second capacitor C2 is filtered and pressure stabilizing；Voltage output by pressure stabilizing is to LED light
Pearl uses.In addition, external dimming commands are received by the PWM port that the simulation/PWM dims chip U1；The simulation/
PWM dims chip U1 and the chip periphery circuit and generates a drive control level according to command content together；And pass through institute
State the control and driving of the 4th resistance R4, the first transistor M1 and the transformer T1；To export constant current described in
LED lamp bead realizes constant-current dimming.
However, supply voltage after rectification needs to keep comparing for the brightness for allowing the LED lamp bead to keep more stable
Stablize, so the value of the first capacitor C1 for rectifying and wave-filtering is generally bigger, generally 47uF or so；To make the LED
Lamp bead keeps more stable and relatively high brightness, causes the second capacitor C2 value larger, generally 220uF or so；This
Sample can make the diode of rectifier bridge turn-on time within the commutation cycle shorter, and then cause program power factor low, and one
As less than 0.5.When the LED lamp bead current maxima is fixed, the number for the LED lamp bead of connecting determines the LED lamp bead
Design voltage；When the LED lamp bead number is less, the overall presure drop of the LED lamp bead is lower, so the efficiency of the program is under
Drop.It is dimmed all the way since the program can only be realized, the higher cost in the case where needing multichannel to dim.
Therefore, it is really necessary to provide the new multichannel dimming drive system of one kind to solve the above problems.
Utility model content
For the above the deficiencies in the prior art, the utility model proposes a kind of achievable multichannel light modulation, power factor it is high and
High-efficient multichannel dimming drive system.
In order to solve the above-mentioned technical problem, the utility model provides a kind of multichannel dimming drive system, comprising: light emitting source
With the driving circuit for driving the light emitting source to realize that constant-current dimming controls, the driving circuit includes:
Rectification module, for mains to be converted direct current and are exported；
Power Factor Correction Control module, the half sine wave voltage for exporting the rectification module carry out power factor
It exports after adjustment processing and boosting steady pressure treatment to the positive terminal of the light emitting source；And
Constant flow module generates corresponding constant electricity according to the IIC dimming commands for receiving external IIC dimming commands
It flows and exports to the negative pole end of the light emitting source.
Preferably, the Power Factor Correction Control module include PFC chip, transformer, first resistor, second resistance,
3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, first capacitor, second
Capacitor, third capacitor, the 5th capacitor, the 6th capacitor, the second diode, third diode, the 4th diode and first crystal
Pipe；
The primary input terminal of the first end of the first resistor, the first end of the second resistance and the transformer point
It is not connected to the output of the rectification module；
The port VCC of the PFC chip be respectively connected to the second end of the second resistance, the first end of the second capacitor with
And second diode negative pole end；
The secondary output end of the transformer is connected to the end ZCD of the PFC chip by the 5th resistance of connecting
Mouthful；Meanwhile the secondary output end of the transformer is respectively connected to institute by being sequentially connected in series the third capacitor and the 4th resistance
State the positive terminal of the second diode and the negative pole end of the third diode；
The port MULT of the PFC chip be respectively connected to the second end of the first resistor, the 3rd resistor
The first end of one end and the first capacitor；
The primary output terminal of the transformer is respectively connected to the positive terminal and the first crystal of the 4th diode
The drain electrode end of pipe；
The negative pole end of 4th diode be respectively connected to the 9th resistance first end, the first end of the 5th capacitor with
And the positive terminal of the light emitting source；
The port INV of the PFC chip is respectively connected to the 9th resistance second end, the first end of the 8th resistance
And the first end of the 6th capacitor；
The port COMP of the PFC chip is connected to the second end of the 6th capacitor；
The port GD of the PFC chip is connected to the gate terminal of the first transistor by the 6th resistance of connecting；
The port CS of the PFC chip be respectively connected to the first transistor source terminal and the 7th resistance
One end；
The second end of the 3rd resistor, the second end of the 7th resistance, the second end of the 8th resistance, described
The second end of one capacitor, the second end of second capacitor, the second end of the 5th capacitor, the third diode anode
The secondary input terminal of end and the transformer is grounded.
Preferably, the third diode is zener diode, and the first transistor is that NMOS transistor or power are opened
Guan Guan.
Preferably, the light emitting source is LED lamp bead.
Preferably, the constant flow module includes multiple constant current output ends, and the light emitting source includes multiple groups, the constant flow module
Each constant current output end be connected to the negative pole end of wherein light emitting source described in one group.
Preferably, the constant current output end includes five, and the light emitting source includes five groups and is connected in parallel with each other, each
The constant current output end be respectively connected to one group described in light emitting source negative pole end, the output of the Power Factor Correction Control module
It is respectively connected to the positive terminal of five light emitting sources.
Compared with the relevant technologies, the multichannel dimming drive system of the utility model by the rectification module is exported half
Sine voltage exports after carrying out power factor adjustment processing and boosting steady pressure treatment to the positive terminal of the light emitting source；To mention
The high power factor of the multichannel dimming drive system, wherein exporting the power factor in rated power reaches 0.9 or more, and
It reduces its influence to input voltage fluctuation and stability is good.On the other hand, the constant flow module includes multiple constant current output ends,
The light emitting source includes multiple groups, and each constant current output end of the constant flow module is connected to wherein light emitting source described in one group
Negative pole end；The efficiency of the program is higher and realizes multichannel light modulation.
Detailed description of the invention
According to the present invention will be described in detail below with reference to the accompanying drawings.By made detailed description in conjunction with the following drawings, this is practical
Novel above-mentioned or otherwise content will be apparent and be easier to understand.In attached drawing:
Fig. 1 is that simulation/PWM of the relevant technologies dims the circuit diagram of chip and its peripheral circuit scheme；
Fig. 2 is the circuit diagram of the utility model multichannel dimming drive system；
Fig. 3 is key node waveform diagram in Fig. 2.
Specific embodiment
The specific embodiment that according to the present invention will be described in detail below with reference to the accompanying drawings.
Specific embodiment/the embodiment recorded herein is the specific specific embodiment of the utility model, for saying
The design of bright the utility model, be it is explanatory and illustrative, should not be construed as to the utility model embodiment and this reality
With the limitation of novel range.In addition to the embodiment recorded herein, those skilled in the art can also be based on the claim of this application
Using obvious other technical solutions, these technical solutions include using to remembering herein for book and specification disclosure of that
The technical solution for making any obvious substitutions and modifications of the embodiment of load, all the protection scope of the utility model it
It is interior.
It please join shown in Fig. 2, the utility model provides a kind of multichannel dimming drive system 100, comprising: light emitting source 1 and drive
Dynamic circuit 2.
The light emitting source 1 is for converting electrical energy into luminous energy.Specifically, the light emitting source 1 is LED lamp bead, it is certainly unlimited
In this, other devices with attribute.The light emitting source includes multiple groups, that is to say, that light emitting source 1 described in one group is by a lamp
Bead string is constituted, and the lamp bead string is that lamp bead individual is connected in series.In present embodiment, it is five that the light emitting source 1, which includes five groups,
A lamp bead string, respectively lamp bead string 11, lamp bead string 12, lamp bead string 13, lamp bead string 14 and lamp bead string 15.
The driving circuit includes rectification module 21, Power Factor Correction Control module 22 and constant flow module 23.
The rectification module 21 is used to mains converting direct current and export.The output of the rectification module 21 is distinguished
It is connected to the input of the Power Factor Correction Control module 22 and the input of the constant flow module 23.
The half sine wave voltage that the Power Factor Correction Control module 22 is used to export the rectification module 21 carries out
It exports after power factor adjustment processing and boosting steady pressure treatment to the positive terminal of the light emitting source 1.
Specifically, the Power Factor Correction Control module 22 includes PFC chip U1, transformer T1, first resistor R1, the
Two resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8,
Nine resistance R9, first capacitor C1, the second capacitor C2, third capacitor C3, the 5th capacitor C5, the 6th capacitor C6, the second diode D2,
Third diode D3, the 4th diode D4 and the first transistor M1.
The primary of the first end of the first resistor R1, the first end of the second resistance R2 and the transformer T1 is defeated
Enter end and is respectively connected to the output of the rectification module 21, i.e., the first end of the described first resistor R1, the second resistance R2
The voltage of the primary input terminal of first end and the transformer T1 is VCC；The port VCC of the PFC chip is respectively connected to
The negative pole end of the second end of the second resistance R2, the first end of the second capacitor C2 and the second diode D2；The transformer
The secondary output end of T1 is connected to the port ZCD of the PFC chip by the 5th resistance R5 that connects；The transformer T1's
Secondary output end is respectively connected to the second diode D2's by being sequentially connected in series the third capacitor C3 and the 4th resistance R4
The negative pole end of positive terminal and the third diode D3；The port MULT of the PFC chip is respectively connected to the first resistor
The first end of the second end of R1, the first end of the 3rd resistor R3 and the first capacitor C1；The transformer T1's is first
Grade output end is respectively connected to the positive terminal of the 4th diode D4 and the drain electrode end of the first transistor M1；Described 4th
The negative pole end of diode D4 is respectively connected to the 9th resistance R9 first end, the first end of the 5th capacitor C5 and the hair
The input of light source 1, wherein the negative pole end of the 4th diode D4 is the output of the Power Factor Correction Control module 22,
The output voltage is VOUT；The port INV of the PFC chip is respectively connected to the 9th resistance R9 second end, the described 8th
The first end of the first end of resistance R8 and the 6th capacitor C6；The port COMP of the PFC chip is connected to the described 6th
The second end of capacitor C6；The port GD of the PFC chip is connected to the first transistor by the 6th resistance R6 that connects
The gate terminal of M1；The port CS of the PFC chip be respectively connected to the first transistor M1 source terminal and it is described 7th electricity
Hinder the first end of R7；The second end of the 3rd resistor R3, the second end of the 7th resistance R7, the 8th resistance R8
Second end, the second end of the first capacitor C1, the second end of the second capacitor C2, the second end of the 5th capacitor C5,
The positive terminal of the third diode D3 and the secondary input terminal of the transformer T1 are grounded.
It should be noted that the same position resistance, the string of capacitor and relationship are simultaneously unlimited, as long as most in foregoing circuit
Whole numerical value is consistent with ratio, this is the common knowledge that those skilled in the art are readily apparent that according to above content.
In present embodiment, more preferably, the third diode D3 is zener diode, and the first transistor M1 is
NMOS transistor or power switch tube.
The constant flow module 23 is used to receive external IIC dimming commands, is generated according to the IIC dimming commands corresponding permanent
Constant current is simultaneously exported to the negative pole end of the light emitting source 1
Specifically, the interface end of the constant flow module 23 includes OUT output end, the input of IIC control interface, VCC power end
And GND ground terminal.Wherein the VCC power end is connected to the output of the rectification module 21, i.e., the input of the described VCC power end
Voltage is VCC；The GND ground terminal ground connection；The OUT output end is connected to the output of the light emitting source 1；The IIC control
Interface input is for receiving external IIC dimming commands.
The constant flow module 23 includes multiple constant current output ends, and the light emitting source 1 includes multiple groups, and the light emitting source 1 includes
Multiple lamp bead strings, each constant current output end of the constant flow module 23 are connected to the cathode of wherein light emitting source 1 described in one group
End.
In present embodiment, the output end of the constant flow module 23 includes five, and respectively OUT1 output end, OUT2 is defeated
Outlet, OUT3 output end, OUT4 output end and OUT5 output end.The light emitting source 1 includes five groups and is connected in parallel with each other, often
One constant current output end be respectively connected to one group described in light emitting source 1 negative pole end.That is, the light emitting source 1 includes
Five lamp bead strings, respectively the first lamp bead string 11, the first lamp bead string 12, the first lamp bead string 13, the first lamp bead string 14 and first
Lamp bead string 15.The output end of each constant flow module 23 is connected to the negative pole end of a lamp bead string.The i.e. described OUT1
Output end is connected to the negative pole end of the first lamp bead string 11；The OUT2 output end is connected to the negative of the first lamp bead string 12
Extremely；The OUT3 output end is connected to the negative pole end of the first lamp bead string 13；The OUT4 output end is connected to described
The negative pole end of one lamp bead string 14；The OUT5 output end is connected to the negative pole end of the first lamp bead string 15.The power factor
The output of Corrective control module 22 is respectively connected to the positive terminal of five light emitting sources 1.The i.e. described first lamp bead string 11 is just
Extremely, the anode of the positive terminal of the first lamp bead string 12, the positive terminal of the first lamp bead string 13, the first lamp bead string 14
The positive terminal of end and the first lamp bead string 15 is respectively connected to the output of the Power Factor Correction Control module 22, also
To say, the positive terminal of the first lamp bead string 11, the positive terminal of the first lamp bead string 12, the first lamp bead string 13 anode
The positive terminal at end, the positive terminal of the first lamp bead string 14 and the first lamp bead string 15 is respectively connected to the four or two pole
The negative pole end of pipe D4, the voltage of the node are VOUT.The circuit may be implemented multichannel dimming function and including brightness stability.
The constant flow module 23 includes all the way for receiving the IIC control interface input of IIC dimming commands, the IIC control
Interface input processed includes a port SDA and a port SCL.
In present embodiment, the constant flow module 23 includes that multiple IIC controls for receiving IIC dimming commands respectively connect
Mouth input, each described IIC control interface input includes a port SDA and a port SCL.More preferably, the constant current
Module 23 includes five IIC control interface inputs；The light emitting source includes five groups and is connected in parallel with each other, i.e., described to shine
Source 1 includes five lamp bead strings, each described IIC control interface input control one described lamp bead string, to control the lamp bead
The brightness of string.Certainly, without being limited thereto, it can also be arranged described in the IIC control interface input control two or three
Lamp bead string, this two or three lamp bead cross luma degree it is consistent.In practical applications, it can configure according to actual needs
The quantity of IIC control interface input.
It should be noted that be related in the description at the both ends of the electronic components such as resistance, capacitor in present embodiment, if
For the component there are positive and negative polarity, then it is negative pole end that first end, which is positive terminal, second end,；If not distinguishing positive and negative polarity,
First end and second end is successively then defined as according to the flow direction of electric signal, to facilitate description.
It is further illustrated below from the working condition of the multichannel dimming drive system:
In present embodiment, fuse F1, varistor R10, by first diode D1, the 5th diode D5, the six or two
The rectifier bridge and filter capacitor C4 of pole pipe D6 and the 7th diode D7 composition have collectively constituted the embodiment of the present invention rectification mould
Block 21.It please join shown in Fig. 3, mains voltage is VIN；The output voltage of the rectification module 21 is VCC；The rectification module
21 are converted into the alternating voltage VIN of alternating current 220V50Hz the half sine wave voltage VCC after rectification.Wherein, the input electricity of alternating current
Pressing VIN is the alternating current of 85V to 240VAC, and waveform is sine wave, and voltage VCC output waveform is partly just after bridge rectifier
String wave.
In present embodiment, the Power Factor Correction Control module 22 is the power factor adjustment member of the present embodiment,
It is simultaneously also the boosting voltage stabilization part of the present embodiment.Voltage waveform after rectification is converted into the high direct voltage of 400V by the part,
And the power factor that the multichannel dimming drive system 100 is kept in conversion process is relatively high value, and specific value reaches
To 0.9 or more, and close to 1.
Specifically, the Power Factor Correction Control module 22 includes PFC chip U1, and in present embodiment, the PFC core
Piece U1 is single- stage PFC chip.
When the multichannel dimming drive system 100 carries out system electrification, the second capacitor R2 is as start-up resistor, institute
The rectified voltage VCC for stating the output of rectification module 21 is supplied to the port VCC of the PFC chip U1, and the PFC chip U1 is opened
It starts building to make.
When the multichannel dimming drive system 100 carries out system normal operation, the PFC chip U1 is supplied by DC low-voltage
Circuit power supply, secondary, described third capacitor C3, fourth electricity of the DC low-voltage power supply circuit by the transformer T1
Hinder R4, the third diode D3, the second diode D2 and the second capacitor C2 composition.Circuit handle passes through institute
Stating the secondary of transformer T1 reduces the VCC voltage for being input to the transformer T1 primary, while the secondary of the transformer T1
Generate induced current IS.When induced current IS is timing, induced current IS passes through the third capacitor C3, the 4th electricity
Resistance R4, the third diode D3, the second diode D2 charge to the second capacitor C2.Because described second
The capacitance of capacitor C2 is bigger, is generally set to 22uF, and the first end of the second capacitor C2 forms one close to the steady of direct current
Constant voltage VDD is provided to the port VCC of the PFC chip U1.
When the multichannel dimming drive system 100 carries out system normal operation, the port the GD output of the PFC chip U1
When one high level, the high level of the output is supplied to the grid of the first transistor M1 by the 6th resistance R6 that connects
End；The first transistor M1 is NMOS transistor or power switch tube, the first transistor M1 conducting；Wherein described
The turn-on time Ton of one transistor M1 is a set time Ton.The primary current IP of the transformer T1 becomes larger, meanwhile, institute
It states the secondary of transformer T1 and generates induced current IS.On the contrary, when the port GD of the PFC chip U1 exports a low level, institute
The first transistor M1 closing is stated, the primary current IP of the transformer T1 becomes smaller, meanwhile, the secondary of the transformer T1 generates
The induced current IS of opposite direction.The PFC chip U1 under the control of control logic, the primary current of the transformer T1
The average value of IP presents and waveform and phase rectified voltage VCC about the same, thus the multichannel dimming drive system 100
Input power factor be maintained at higher level, wherein exporting the power factor in rated power reaches 0.9 or more, and close to
1。
The output voltage VO UT of the Power Factor Correction Control module 22 by acted on as feedback resistance described
Voltage value is fed back to the port COMP and the port INV of the PFC chip U1 by eight resistance R8 and the 9th resistance R9.It is described
Analog-digital converter ADC inside PFC chip U1 by the voltage of the port INV be converted to digital signal be supplied to it is described
Counter inside PFC chip U1.The counter sets the sizes values of the turn-on time Ton according to above-mentioned digital signal,
To control the primary current IP average value size of the transformer T1, to realize the stability contorting of output voltage.
IIC dimming commands outside the IIC control interface input reception of the constant flow module 23, and according to the IIC
The constant current value of dimming commands setting response is supplied to different output port OUT, wherein for the port OUT1 to the port OUT5, into
And realize the current constant control of chip；Each output port OUT individually controls the brightness of the lamp bead string, realizes multichannel tune
Light.
The IIC control interface input includes a port SDA and a port SCL, and the IIC dimming commands pass through institute
It states the port SDA and the port SCL and enters progress IIC verification after the PFC chip U1, error code can be effectively prevented, improve
Accuracy and anti-interference to signal are conducive to transmit at a distance.
It is analyzed by foregoing circuit, the output voltage stabilization of the Power Factor Correction Control module 22 can be by setting
Count the light emitting source 1 number control voltage, and the constant flow module 23 control be output to the light emitting source 1 constant current value it is big
It is small, to realize the high efficiency of the multichannel dimming drive system 100.
Compared with the relevant technologies, the multichannel dimming drive system of the utility model by the rectification module is exported half
Sine voltage exports after carrying out power factor adjustment processing and boosting steady pressure treatment to the positive terminal of the light emitting source；To mention
The high power factor of the multichannel dimming drive system, wherein exporting the power factor in rated power reaches 0.9 or more, and
It reduces its influence to input voltage fluctuation and stability is good.On the other hand, the constant flow module includes multiple constant current output ends,
The light emitting source includes multiple groups, and each constant current output end of the constant flow module is connected to wherein light emitting source described in one group
Negative pole end；The efficiency of the program is higher and realizes multichannel light modulation.
It should be noted that each embodiment above by reference to described in attached drawing is only to illustrate the utility model rather than limits
The scope of the utility model processed, those skilled in the art should understand that, in the spirit and model for not departing from the utility model
The modification or equivalent replacement carried out under the premise of enclosing to the utility model, should all cover within the scope of the utility model.
In addition, signified outer unless the context, the word occurred in the singular includes plural form, and vice versa.In addition, except non-specifically
Illustrate, then any embodiment all or part of in combination with any other embodiment all or part of come using.
Claims (6)
1. a kind of multichannel dimming drive system characterized by comprising light emitting source and for driving the light emitting source to realize constant current
The driving circuit of brightness adjustment control, the driving circuit include:
Rectification module, for mains to be converted direct current and are exported；
Power Factor Correction Control module, the half sine wave voltage for exporting the rectification module carry out power factor adjustment
It exports after processing and boosting steady pressure treatment to the positive terminal of the light emitting source；And
Constant flow module generates corresponding constant current simultaneously according to the IIC dimming commands for receiving external IIC dimming commands
It exports to the negative pole end of the light emitting source.
2. multichannel dimming drive system according to claim 1, which is characterized in that the Power Factor Correction Control module
Including PFC chip, transformer, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th
Resistance, the 8th resistance, the 9th resistance, first capacitor, the second capacitor, third capacitor, the 5th capacitor, the 6th capacitor, the two or two pole
Pipe, third diode, the 4th diode and the first transistor；
The primary input terminal of the first end of the first resistor, the first end of the second resistance and the transformer connects respectively
It is connected to the output of the rectification module；
The port VCC of the PFC chip is respectively connected to the second end of the second resistance, the first end of the second capacitor and
The negative pole end of two diodes；
The secondary output end of the transformer is connected to the port ZCD of the PFC chip by the 5th resistance of connecting；Together
When, the secondary output end of the transformer is respectively connected to described second by being sequentially connected in series the third capacitor and the 4th resistance
The negative pole end of the positive terminal of diode and the third diode；
The port MULT of the PFC chip is respectively connected to the second end of the first resistor, the first end of the 3rd resistor
And the first end of the first capacitor；
The primary output terminal of the transformer is respectively connected to the positive terminal and the first transistor of the 4th diode
Drain electrode end；
The negative pole end of 4th diode is respectively connected to the 9th resistance first end, the first end of the 5th capacitor and institute
State the positive terminal of light emitting source；
The port INV of the PFC chip be respectively connected to the 9th resistance second end, the first end of the 8th resistance and
The first end of 6th capacitor；
The port COMP of the PFC chip is connected to the second end of the 6th capacitor；
The port GD of the PFC chip is connected to the gate terminal of the first transistor by the 6th resistance of connecting；
The port CS of the PFC chip be respectively connected to the first transistor source terminal and the 7th resistance first
End；
The second end of the 3rd resistor, the second end of the 7th resistance, the second end of the 8th resistance, first electricity
The second end of appearance, the second end of second capacitor, the second end of the 5th capacitor, the third diode positive terminal with
And the secondary input terminal of the transformer is grounded.
3. multichannel dimming drive system according to claim 2, which is characterized in that the third diode is two pole of pressure stabilizing
Pipe, the first transistor are NMOS transistor or power switch tube.
4. multichannel dimming drive system according to claim 1, which is characterized in that the light emitting source is LED lamp bead.
5. multichannel dimming drive system according to claim 1, which is characterized in that the constant flow module includes multiple constant currents
Output end, the light emitting source include multiple groups, and each constant current output end of the constant flow module is connected to wherein described in one group
The negative pole end of light emitting source.
6. multichannel dimming drive system according to claim 5, which is characterized in that the constant current output end includes five,
The light emitting source includes five groups and being connected in parallel with each other, each described constant current output end be respectively connected to one group described in light emitting source
Negative pole end, the output of the Power Factor Correction Control module is respectively connected to the positive terminal of five light emitting sources.
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| CN201821368134.9U CN209345423U (en) | 2018-08-23 | 2018-08-23 | Multichannel dimming drive system |
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| CN201821368134.9U CN209345423U (en) | 2018-08-23 | 2018-08-23 | Multichannel dimming drive system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110519898A (en) * | 2019-09-04 | 2019-11-29 | 西安中科微星光电科技有限公司 | The light source control module and light source control method of star simulator |
-
2018
- 2018-08-23 CN CN201821368134.9U patent/CN209345423U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110519898A (en) * | 2019-09-04 | 2019-11-29 | 西安中科微星光电科技有限公司 | The light source control module and light source control method of star simulator |
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