CN104994659B - A kind of LED light adjusting circuits - Google Patents
A kind of LED light adjusting circuits Download PDFInfo
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- CN104994659B CN104994659B CN201510439523.0A CN201510439523A CN104994659B CN 104994659 B CN104994659 B CN 104994659B CN 201510439523 A CN201510439523 A CN 201510439523A CN 104994659 B CN104994659 B CN 104994659B
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Abstract
A kind of LED light adjusting circuits provided by the invention, including sequentially connected input rectifying filter circuit, transformer and output rectifier and filter, transformer includes primary coil, secondary coil and ancillary coil；Further include phase-cut dimming circuit, start-up circuit, drive control IC1, power switch pipe, feedback control circuit, constant current constant voltage IC2 and 0 10V light adjusting circuits；Input rectifying filter circuit connects drive control IC1 by start-up circuit, input rectifying filter circuit, phase-cut dimming circuit, drive control IC1 and power switch pipe are sequentially connected, power switch pipe connects primary coil, and ancillary coil connection drive control IC1 powers for drive control IC1；Secondary coil connects output rectifier and filter, and output rectifier and filter connects constant current constant voltage IC2 and 0 10V light adjusting circuits, 0 10V light adjusting circuits connection constant current constant voltage IC2 respectively；Constant current constant voltage IC2 is connected by feedback control circuit with drive control IC1.Compared with prior art, the present invention has the advantages that simple in structure, easy to adjust.
Description
Technical field
The present invention relates to a kind of LED illumination control circuits, are specially a kind of LED light adjusting circuits.
Background technology
LED is lighting source of new generation, since LED luminous efficiencies are high, energy expenditure is low, long lifespan, not mercurous, and is had
Good dimming behavior, therefore market spreading speed is very fast.It is right in order to build more comfortable lighting atmosphere and energy saving
The research of LED light regulating technologies seems of crucial importance.Two kinds of mainstream light modulators of existing market, one kind are silicon-controlled phase-cut dimmers,
Another kind is 0-10V light modulators.However, the light modulation of existing LED power is all a kind of single dimming mode, user installation and
With can all run into many problems in the process, for example, corresponding light modulation device must be bought, it is clear that the LED of the prior art
Light adjusting circuit can not meet the application demand of people.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of LED intelligence simple in structure, easy to adjust
Light adjusting circuit.
In order to solve the above-mentioned technical problem, the present invention uses following technical scheme：A kind of LED light adjusting circuits, feature exist
In：Including sequentially connected input rectifying filter circuit, transformer and output rectifier and filter, the transformer includes primary
Coil, secondary coil and ancillary coil；Further include phase-cut dimming circuit, start-up circuit, drive control IC1, power switch pipe, anti-
Present control circuit, constant current constant voltage IC2 and 0-10V light adjusting circuit；
The input rectifying filter circuit connects the drive control IC1, the input rectifying by the start-up circuit
Filter circuit, the phase-cut dimming circuit, the drive control IC1 and the power switch pipe are sequentially connected, and the power is opened
It closes pipe and connects the primary coil, the ancillary coil connects the drive control IC1, powers for drive control IC1；
The secondary coil connects the output rectifier and filter, and the output rectifier and filter connects described respectively
Constant current constant voltage IC2 and the 0-10V light adjusting circuits, the 0-10V light adjusting circuits connect the constant current constant voltage IC2；
The constant current constant voltage IC2 is connected by the feedback control circuit with the drive control IC1.
The phase-cut dimming circuit provides dim signal for drive control IC1, and the output rectifier and filter will export
In voltage, current feedback to the constant current constant voltage IC2, respectively with reference voltage, current vs, when output voltage or electric current are more than
Reference voltage or electric current, the constant current constant voltage IC2 output dim signals are transmitted to the driving through the feedback control circuit and control
IC1 processed, the drive control IC1 correspondingly adjust its output current；The 0-10V light adjusting circuits are to the constant current constant voltage IC2
Dim signal is provided, the constant current constant voltage IC2 outputs dim signal is transmitted to the drive control IC1 through feedback circuit, described
Drive control IC1 correspondingly adjusts its output current；
The phase-cut dimming circuit includes resistance R4, R5 and R6 of series connection, described in the input rectifying filter circuit connection
Resistance R6, the resistance R4 ground connection；Resistance R4, R5 and R6 partial pressure, the tie point of the resistance R4 and resistance R5 connect
Connect the MULT feet of the drive control IC1.When input voltage phase-cut dimming, the MULT feet of the drive control IC1 detect
Voltage on resistance R4, so as to adjust output current value；
The 0-10V light adjusting circuits are equipped with 0-10V light modulations IC3, voltage reference IC4 and 0-10V light modulation input terminal；The electricity
Press benchmark IC4 plus earths, the IN+ feet of 0-10V light modulations IC3 be connected to voltage reference IC4 cathodes 4 and the 0-10V dim it is defeated
Between entering end, such setting makes voltage reference IC4 provide reference voltage for 0-10V light modulations IC3；The 0-10V light modulations IC3's
Output feet are connected with IN1- feet by resistance R38.Above-mentioned set-up mode makes the Output foot voltage follows of 0-10V light modulations IC3
0-10V dims the voltage change of input terminal, adjusts 0-10V light adjusting circuits accurate；The Output feet of the 0-10V light modulations IC3
It is connected with IN2+ feet by resistance R36, R41；The IN2- feet of 0-10V light modulations IC3 are grounded by capacitance C21；0-10V dims IC3
Output2 feet through diode D9 connection IN2- feet.Above-mentioned set-up mode makes Output2 foot voltage follow Output foot voltages
Variation, that is, follow the voltage change of 0-10V light modulation input terminals, i.e. 0-10V light adjusting circuits form voltage follower, it is permanent to adapt to constant current
The parameter of IC2 is pressed, it is more accurate to adjust.
LED Intelligent dimming circuits provided by the invention using simple structure, have been compatible with phase-cut dimming and 0-10V light modulations
Two kinds of dimming modes commonly used in the prior art, moreover, phase-cut dimming circuit and 0-10V light adjusting circuits are respectively arranged at primary line
Circle one side and secondary coil one side, two kinds of dim signals are adjusted independently of each other, what user can be according to needed for being selected actual conditions
Dimming mode, when matching dimming pieces, range of choice is wider.Therefore compared with prior art, the present invention has simple in structure, adjusting
The advantages of facilitating.
Further, the output voltage of the output rectifier and filter is divided by the resistance R28 and R29 to connect, described
The tie point of resistance R28 and R29 connect the IN1- feet of the constant current constant voltage IC2, and the output rectifier and filter 3 passes through resistance
R23 is connected the IN1+ feet of the constant current constant voltage IC2 with R26, and reference power supply is provided for constant current constant voltage IC2 internal references.
The Output2 feet of the 0-10V light adjusting circuits are connected to the IN2+ feet of the constant current constant voltage IC2 by resistance R31,
The IN2- feet of the constant current constant voltage IC2 connect sampling resistor RJ1, the sampling resistor RJ1 by resistance R34 and are connected to described defeated
Go out on the ground wire of current rectifying and wave filtering circuit 3.
OUT1 feet, the OUT2 feet of the constant current constant voltage IC2 connects the feedback control circuit.
Further, the feedback control circuit includes common anode diode and photoelectrical coupler；The constant current constant voltage IC2's
OUT1 feet, OUT2 feet connect two cathodes of the common anode diode by resistance R24 with R25 respectively；The output rectification filter
Wave circuit resistance R23, R22 connect the input anode of the photoelectrical coupler, and the anode of the common anode diode connects the light
The input cathode of electric coupler；The output of the photoelectrical coupler connects the COMP feet of the drive control IC1.The constant current is permanent
Pressure IC2 compares output voltage and internal reference voltage, compares the dim signal and output current of the output of 0-10V light adjusting circuits, when
When output voltage changes more than certain value or 0-10V dim signals, the light emitting source in photoelectrical coupler has electric current to pass through light
Electric coupler output current is affected by it, and feeds back to drive control IC1, and drive control IC changes the duty of power switch pipe Q2
Than so as to adjust output current.
Further, it is grounded after described ancillary coil connection resistance R7, R8；The resistance R7 connects point with the resistance R8
Pressure, tie point are connected with drive control IC1, and reference voltage is provided for drive control IC1.
Further, the ancillary coil passes through the ZCD feet of the resistance R20 connections drive control IC1, the detection of ZCD feet
The zero crossing electric current of ancillary coil prevents the transformer from saturation occur.
Further, the COMP feet of the drive control IC1 are connected with compensation circuit.The compensation circuit maintains loop
Stability makes drive control IC1 keep stable work.
Further, sampling resistor RJ1, sampling resistor RJ1 and the constant current are equipped in the output rectifier and filter
The IN2- feet connection of constant pressure IC2；Diode D6 in parallel on sampling resistor RJ1.When LED load short circuit, diode D6's sets
Energy protective resistance RJ1 is put not to be burned due to electric current is excessive.
Further, passive leadage circuit is further included, passive leadage circuit includes resistance R3 and capacitance CB2, resistance R3's
One end is grounded, and the other end connects the capacitance CB2, and the other end of capacitance CB2 is connected to the start-up circuit, primary line
Circle and phase-cut dimming circuit.The passive leadage circuit ensures that initial input current amount is sufficient for the minimal maintenance of phase-cut dimming
Electric current, and peak current is absorbed, input current is made to tend towards stability.
Description of the drawings
Fig. 1 is LED light adjusting circuits block diagram provided by the invention；
Fig. 2 is the circuit diagram of LED light adjusting circuits provided by the invention；
Fig. 3 is 0-10V light adjusting circuit schematic diagrams in LED light adjusting circuits provided by the invention.
Specific embodiment
Below in conjunction with the specific embodiment of the description of the drawings present invention.
Referring to Fig. 1 to 3, a kind of LED light adjusting circuits provided by the invention, including sequentially connected input rectifying filter circuit
1st, transformer 2 and output rectifier and filter 3, the transformer 2 include primary coil 201, secondary coil 203 and ancillary coil
202；Further include phase-cut dimming circuit 4, start-up circuit 11, drive control IC1, power switch pipe 5, feedback control circuit 6, constant current
Constant pressure IC2 and 0-10V light adjusting circuit 7；
The input rectifying filter circuit 1 connects the drive control IC1 by the start-up circuit 11, and the input is whole
Stream filter circuit 1, the phase-cut dimming circuit 4, the drive control IC1 and the power switch pipe 5 are sequentially connected, the work(
Rate switching tube 5 connects the primary coil 201, and the ancillary coil 202 connects the drive control IC1, is drive control IC1
Power supply；
The secondary coil 203 connects the output rectifier and filter 3, and the output rectifier and filter 3 connects respectively
The constant current constant voltage IC2 and the 0-10V light adjusting circuits 7 are met, the 0-10V light adjusting circuits 7 connect the constant current constant voltage IC2；
The constant current constant voltage IC2 is connected by the feedback control circuit 6 with the drive control IC1.
The phase-cut dimming circuit 4 provides dim signal for drive control IC1, and the output rectifier and filter 3 will be defeated
Go out voltage, in current feedback to the constant current constant voltage IC2, and its internal reference voltage, current vs, when output voltage is more than base
Quasi- voltage, electric current, the constant current constant voltage IC2 outputs dim signal are transmitted to the drive control through the feedback control circuit 6
IC1, the drive control IC1 correspondingly adjust its output current；The 0-10V light adjusting circuits 7 are carried to the constant current constant voltage IC2
For dim signal, the constant current constant voltage IC2 outputs dim signal is transmitted to the drive control IC1, the drive through feedback circuit 6
Dynamic control IC1 correspondingly adjusts its output current.
A kind of LED light adjusting circuits provided by the invention using simple structure, have been compatible with phase-cut dimming and 0-10V light modulations
Two kinds of common dimming modes of user, moreover, two kinds of dim signals of phase-cut dimming circuit 4 and 0-10V light adjusting circuits 7 are mutually only
Dimming mode vertical to adjust, that user can be according to needed for being selected actual conditions, when matching dimming pieces, range of choice is wider.Therefore
Compared with prior art, the present invention has the advantages that simple in structure, easy to adjust.
Referring to Fig. 2, the phase-cut dimming circuit 4 includes resistance R4, R5 and R6 of series connection, the input rectifying filter circuit
The 1 connection resistance R6, the resistance R4 ground connection；Resistance R4, R5 and R6 partial pressure, the resistance R4 and resistance R5's
Tie point connects the MULT feet of the drive control IC1.When input voltage phase-cut dimming, the MULT of the drive control IC1
Foot detects the voltage on resistance R4, so as to adjust output current value.
Referring to Fig. 2, the output rectifier and filter 3 provides vdd voltage, the resistance R23 connections institute by resistance R23
Constant current constant voltage IC2 and the 0-10V light adjusting circuits 7 are stated, is that the constant current constant voltage IC2 and the 0-10V light adjusting circuits 7 are powered.
Referring to Fig. 3, the 0-10V light adjusting circuits 7 are voltage and current follower, including 0-10V light modulations IC3, resistance
R35, R36, R37, R38, R39, R40, R41, diode D9, capacitance C21 and voltage reference IC4；Described resistance R40, R37
It connects and divides with R35, the input terminal (0-10V DIM+) of the termination 0-10V light adjusting circuits 7 of the resistance R40 is described
The other end ground connection of termination the voltage reference IC4, the voltage reference IC4 of resistance R35, the resistance R35 with it is described
The tie point of resistance R37 connects the IN1+ feet of the 0-10V light modulations IC3；
The IN1- feet of the 0-10V light modulations IC3 are grounded by the resistance R39, the Output of the 0-10V light modulations IC3
Foot dims the IN1- feet of IC3 by the resistance R38 connections, is arranged such the Output foot voltage follows for making 0-10V light modulations IC3
The input terminal voltage variation of the 0-10V light adjusting circuits 7；
The Output feet of the 0-10V light modulations IC3 connect the 0-10V light modulations IC3's by the resistance R36 with R41
IN2+ feet, the IN2- feet of the 0-10V light modulations IC3 are grounded by the capacitance C21, the Output2 of the 0-10V light modulations IC3
Foot connects its IN2- foot through the diode D9, is arranged such the Output2 foot voltage follows for making the 0-10V light modulations IC3
Output foot voltage changes follow 0-10V to dim the voltage change of input terminal (0-10V DIM+)；
The REF signal of the Output2 feet output carrying 0-10V light modulation input terminal voltage variations of the 0-10V light modulations IC3,
It is connected to the constant current constant voltage IC2.
Referring to Fig. 2, the start-up circuit 11 includes resistance R13, R14, R15, and the input rectifying filtered electrical 1 passes through resistance
R13, R14, R15 connect the VCC feet of the drive control IC1, start the drive control IC1.
The ancillary coil 202 connects the VCC feet of the drive control IC1 by linear voltage-stabilizing circuit 8, is the driving
Control IC1 power supplies.
The ancillary coil 202 is grounded after connecting resistance R8, R7；The resistance R7 connects partial pressure with the resistance R8,
Tie point is connected to the INV feet of the drive control IC1, the INV foot sampled voltage signals of the drive control IC1, and with it is interior
Portion's reference voltage compares, to obtain fixed DC adjustmenting voltage.
The GD feet of the drive control IC1 are opened by the grid of the resistance R16 connections power switch pipe 5, the power
The source electrode for closing pipe 5 is grounded by sampling resistor R19, and the drain electrode of the power switch pipe 5 connects the primary coil 201.
By the ZCD feet of the resistance R20 connections drive control IC1, ZCD feet detect described auxiliary the ancillary coil 202
The zero crossing electric current of index contour circle 202 prevents the transformer 2 from saturation occur.
The CS feet of the drive control IC1 are by resistance R12 connection sampling resistor R19 to detection of excessive current, the drive
The CS feet of dynamic control IC1 detect the electric current of the primary coil 201.
The COMP feet of the drive control IC1 are connected with compensation circuit 9, the compensation circuit 9 include resistance R9, R10 and
Capacitance C2, the resistance R9 is in parallel with the resistance R10 after connecting with the capacitance C2, described in one end connection of the resistance R9
Resistance R8, the other end connect the capacitance C2, the COMP feet of the other end connection drive control IC1 of the capacitance C2.The benefit
The stability that circuit 9 maintains loop is repaid, drive control IC1 is made to keep stable work.
Referring to Fig. 2, the output voltage of the output rectifier and filter 3 is divided by the resistance R28 and R29 to connect, described
The tie point of resistance R28 and R29 connect the IN1- feet of the constant current constant voltage IC2, and the output rectifier and filter 3 passes through resistance
R23 is connected the IN1+ feet of the constant current constant voltage IC2 with R26, and reference power supply is provided for constant current constant voltage IC2 internal references.
The REF signal that the 0-10V light adjusting circuits 7 export is connected to the IN2+ of the constant current constant voltage IC2 by resistance R31
Foot, the IN2- feet of the constant current constant voltage IC2 connect sampling resistor RJ1, the sampling resistor RJ1 by resistance R34 and are connected to institute
On the ground wire for stating output rectifier and filter 3.
The feedback control circuit 6 includes common anode diode D8 and photoelectrical coupler 601；The constant current constant voltage IC2's
OUT1 feet, OUT2 feet connect two cathodes of the common anode diode D8 by resistance R24 with R25 respectively；The VDD signal leads to
The input anode of the resistance R22 connections photoelectrical coupler 601 is crossed, the anode of the common anode diode connects the photoelectric coupling
The input cathode of device 601；The output of the photoelectrical coupler 601 connects the COMP feet of the drive control IC1.The constant current is permanent
Pressure IC2 compares output voltage and internal reference voltage, compares the REF signal and output current of the output of 0-10V light adjusting circuits, when defeated
When going out voltage and changing more than certain value or REF signal, the light emitting source in photoelectrical coupler 601 has electric current to pass through photoelectricity coupling
601 output current of clutch is affected by it, and feeds back to drive control IC1, changes the duty cycle of drive control IC1 output currents, from
And adjust output current.
Referring to Fig. 2, as a preferred embodiment, diode D6 in parallel on the sampling resistor RJ1, when LED load is short
Lu Shi, LED load, common mode inductance LF3, diode D6, secondary coil 203 are formed into a loop, and protect sampling resistor RJ1 not because of electric current
It is excessive and be burned.
Referring to Fig. 2, as a preferred embodiment, the input rectifying filter circuit 1 is connected by passive leadage circuit 10
Drive control IC1, transformer 2 and phase-cut dimming circuit 4, the passive leadage circuit 10 includes resistance R3 and capacitance CB2, described
One end ground connection of resistance R3, the other end connect the capacitance CB2, and the other end of the capacitance CB2 is connected to the start-up circuit
11st, primary coil 201 and phase-cut dimming circuit 4.The passive leadage circuit 10 ensures that initial input current amount is sufficient for cutting
The mutually minimal maintenance electric current of light modulation 4, and peak current is absorbed, input current is made to tend towards stability.
Referring to Fig. 2, as a preferred embodiment, the linear voltage-stabilizing circuit 8 uses LDO regulator circuits.When input and it is defeated
When going out curent change, the linear voltage-stabilizing circuit is able to maintain that drive control IC1 is constantly in normal working condition.
According to the disclosure and teachings of the above specification, those skilled in the art in the invention can also be to above-mentioned embodiment party
Formula is changed and changed.Therefore, the invention is not limited in specific embodiment disclosed and described above, to the present invention's
Some modifications and changes should also be as falling into the scope of the claims of the present invention.In addition, it although is used in this specification
Some specific terms, but these terms are merely for convenience of description, do not limit the present invention in any way.
Claims (8)
1. a kind of LED light adjusting circuits, it is characterised in that：Including sequentially connected input rectifying filter circuit, transformer and output
Current rectifying and wave filtering circuit, the transformer include primary coil, secondary coil and ancillary coil；It further includes phase-cut dimming circuit, open
Dynamic circuit, drive control IC1, power switch pipe, feedback control circuit, constant current constant voltage IC2 and 0-10V light adjusting circuit；
The input rectifying filter circuit connects the drive control IC1, the input rectifying filtering by the start-up circuit
Circuit, the phase-cut dimming circuit, the drive control IC1 and the power switch pipe are sequentially connected, the power switch pipe
The primary coil is connected, the ancillary coil connects the drive control IC1, powers for drive control IC1；
The secondary coil connects the output rectifier and filter, and the output rectifier and filter connects the constant current respectively
Constant pressure IC2 and the 0-10V light adjusting circuits, the 0-10V light adjusting circuits connect the constant current constant voltage IC2；
The constant current constant voltage IC2 is connected by the feedback control circuit with the drive control IC1；
The phase-cut dimming circuit provides dim signal for drive control IC1, the output rectifier and filter by output voltage,
Current feedback in the constant current constant voltage IC2, respectively with reference voltage, current vs, when output voltage or electric current are more than benchmark
Voltage or electric current, the constant current constant voltage IC2 outputs dim signal are transmitted to the drive control through the feedback control circuit
IC1, the drive control IC1 are by exporting the conducting and cut-off of height control of Electric potentials switching tube Q2；The 0-10V light adjusting circuits
Dim signal is provided to the constant current constant voltage IC2, the constant current constant voltage IC2 output dim signals are transmitted to described through feedback circuit
Drive control IC1, the drive control IC1 correspondingly adjust its output current；
The phase-cut dimming circuit includes resistance R4, R5 and R6 of series connection, and the input rectifying filter circuit connects the resistance
R6, the resistance R4 ground connection；Resistance R4, R5 and R6 partial pressure, the resistance R4 are connected institute with the tie point of the resistance R5
State the MULT feet of drive control IC1；
The 0-10V light adjusting circuits are equipped with 0-10V light modulations IC3, voltage reference IC4 and 0-10V light modulation input terminal；The voltage base
Quasi- IC4 plus earths, the IN1+ feet of the 0-10V light modulations IC3 are connected to the cathode of voltage reference IC4 and 0-10V light modulations input
Between end；
The Output feet of the 0-10V light modulations IC3 are connected with IN1- feet by resistance R38；
The Output feet of the 0-10V light modulations IC3 are connected with IN2+ feet by resistance R36, R41；0-10V dims the IN2- of IC3
Foot is grounded by capacitance C21；The Output2 feet of 0-10V light modulations IC3 are through diode D9 connection IN2- feet；
The 0-10V light adjusting circuits are voltage and current follower, further include, resistance R35, R36, R37, R38, R39, R40,
R41, diode D9 and capacitance C21；Resistance R40, R37 series connection partial pressure, a termination 0-10V of the resistance R40
The input terminal of light adjusting circuit, a termination of the resistance R35 connect the voltage reference IC4 cathodes, other end connection IN1+ feet；
The IN1- feet of the 0-10V light modulations IC3 are grounded by the resistance R39；
The REF signal of the Output2 feet output carrying 0-10V light modulation input terminal voltage variations of the 0-10V light modulations IC3, connection
To the constant current constant voltage IC2；
The start-up circuit includes resistance R13, R14, R15, and the input rectifying filter circuit is connected by resistance R13, R14, R15
The VCC feet of the drive control IC1 are connect, start the drive control IC1.
2. a kind of LED light adjusting circuits according to claim 1, it is characterised in that：The output rectifier and filter it is defeated
Go out voltage to be divided by the resistance R28 and R29 to connect, the tie point of the resistance R28 and R29 connects the constant current constant voltage IC2's
IN1- feet, the output rectifier and filter are connected the IN1+ feet of the constant current constant voltage IC2 by resistance R23 with R26, are constant current
Constant pressure IC2 internal references provide reference power supply；
The dim signal of the 0-10V light adjusting circuits output is connected to the IN2+ feet of the constant current constant voltage IC2 by resistance R31,
The IN2- feet of the constant current constant voltage IC2 connect sampling resistor RJ1, the sampling resistor RJ1 by resistance R34 and are connected to described defeated
Go out on the ground wire of current rectifying and wave filtering circuit；
OUT1 feet, the OUT2 feet of the constant current constant voltage IC2 connects the feedback control circuit.
3. a kind of LED light adjusting circuits according to claim 2, it is characterised in that：The feedback control circuit includes common anode
Diode and photoelectrical coupler；Described in OUT1 feet, the OUT2 feet of the constant current constant voltage IC2 is connected respectively by resistance R24 with R25
Two cathodes of common anode diode；The output rectifier and filter connects the photoelectrical coupler by resistance R23, R22
Anode is inputted, the anode of the common anode diode connects the input cathode of the photoelectrical coupler；The photoelectrical coupler it is defeated
Go out the COMP feet for connecting the drive control IC1.
4. a kind of LED light adjusting circuits according to claim 1, it is characterised in that：Described ancillary coil connection resistance R7, R8
After be grounded；The resistance R7 connects partial pressure with the resistance R8, and tie point is connected with drive control IC1, is drive control IC1
Reference voltage is provided.
5. a kind of LED light adjusting circuits according to claim 1, it is characterised in that：The ancillary coil is connected by resistance R20
The ZCD feet of the drive control IC1 are connect, the zero crossing electric current of ZCD feet detection ancillary coil prevents the transformer from saturation occur.
6. a kind of LED light adjusting circuits according to claim 1, it is characterised in that：The COMP feet of the drive control IC1 connect
It is connected to compensation circuit.
7. a kind of LED light adjusting circuits according to claim 1, it is characterised in that：It is set in the output rectifier and filter
There are sampling resistor RJ1, sampling resistor RJ1 to be connected with the IN2- feet of the constant current constant voltage IC2；In parallel two on sampling resistor RJ1
Pole pipe D6.
8. a kind of LED light adjusting circuits according to claim 1, it is characterised in that：Passive leadage circuit is further included, it is passive to let out
Electric discharge road includes resistance R3 and capacitance CB2, and one end of resistance R3 is grounded, and the other end connects the capacitance CB2, the capacitance CB2
The other end be connected to the start-up circuit, transformer and phase-cut dimming circuit.
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| CN109757009A (en) * | 2019-03-14 | 2019-05-14 | 深圳市健森实业有限公司 | A kind of high-precision LED light modulation line and input-output line isolation circuit control system |
| CN110753428B (en) * | 2019-09-19 | 2021-06-08 | 浙江凯耀照明有限责任公司 | Isolation dimming circuit built by operational amplifier |
| CN110519901A (en) * | 2019-09-19 | 2019-11-29 | 深圳市紫光照明技术股份有限公司 | A kind of Intelligent lamp |
| CN110753422B (en) * | 2019-10-19 | 2021-12-03 | 浙江凯耀照明有限责任公司 | Quick start circuit applied to operational amplifier building |
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| CN102026453B (en) * | 2010-12-31 | 2014-04-30 | 崧顺电子（深圳）有限公司 | Light emitting diode (LED) power source dimming control device |
| TWI451808B (en) * | 2011-11-24 | 2014-09-01 | Leadtrend Tech Corp | Dimmable driving systems and dimmable controllers |
| CN205017633U (en) * | 2015-07-23 | 2016-02-03 | 佛山冠今光电科技有限公司 | LED light modulation circuit |
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| CN201854482U (en) * | 2010-11-01 | 2011-06-01 | 王子能 | LED power circuit |
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Denomination of invention: A LED dimming circuit Effective date of registration: 20201214 Granted publication date: 20180518 Pledgee: Shunde Guangdong rural commercial bank Limited by Share Ltd. Daliang branch Pledgor: FOSHAN TOPDAY OPTOELECTRONICS TECHNOLOGY Co.,Ltd. Registration number: Y2020980009231 |
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Date of cancellation: 20211217 Granted publication date: 20180518 Pledgee: Shunde Guangdong rural commercial bank Limited by Share Ltd. Daliang branch Pledgor: FOSHAN TOPDAY OPTOELECTRONICS TECHNOLOGY Co.,Ltd. Registration number: Y2020980009231 |
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Denomination of invention: LED dimming circuit Effective date of registration: 20211220 Granted publication date: 20180518 Pledgee: Guangdong Shunde Rural Commercial Bank Co.,Ltd. science and technology innovation sub branch Pledgor: FOSHAN TOPDAY OPTOELECTRONICS TECHNOLOGY Co.,Ltd. Registration number: Y2021980015722 |