CN104883773B - A kind of single-stage multiple-channel output LED power constant-current drive circuit - Google Patents
A kind of single-stage multiple-channel output LED power constant-current drive circuit Download PDFInfo
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Abstract
The present invention provides a kind of single-stage multiple-channel output LED power constant-current drive circuit, including power module, energy supply control module, transformer, constant current constant voltage control module, signal generator module, output detection module and at least two LED load access passage；Constant current constant voltage control module is connected with energy supply control module, the secondary coil of transformer and signal generator module respectively；Signal generator module is connected by exporting detection module and LED load access passage；Output detection module detects a LED load access passage when having electric current output, sends a signal；Signal generator module determines the port number of LED access；And export corresponding analog voltage according to port number；Constant current constant voltage control module exports corresponding control signal；Energy supply control module controls the size of power module adjustment output current according to control signal.The present invention realizes that single-level circuit drives, and the multiple LEDs of power drives, improves the efficiency of power circuit.
Description
Technical field
The present invention relates to LED circuit field, a kind of single-stage multiple-channel output LED power constant-current drive circuit is particularly related to.
Background technology
Existing multiple-channel output LED drive power has following two：
As shown in figure 1, changing into constant D/C voltage using common secondary constant-current LED power；Constant DC voltage leads to again
Cross buck or boost circuit and carry out output multi-channel driving LED；
As shown in Fig. 2 changing into constant D/C voltage using common primary side constant current LED power supplies.Constant DC voltage leads to again
Cross buck or boost circuit and carry out output multi-channel driving LED；
Number of patent application is 201410499908.1《A kind of multiple-channel output height decompression LED constant current driving power supply》, it is open
It is a kind of to include PFC rectification circuits and the two-part LED drivings of DC/DC decompressions constant current link, by being depressured constant current ring in DC/DC
Section is improved to possess high decompression ability, the converter composition of multiple-channel output ability, and converter input is the height that PFC rectifications are exported
400V direct currents are pressed, output multi-channel constant current driving current drives one group of LED illumination lamp per driving current all the way.Though the patent
Poor reliability caused by excessive LED series connection is so solved the problems, such as, but can not realize that the quantity according to the LED accessed is automatic
The output of electric current is adjusted, and does not support analog voltage dimming function.
Above-mentioned traditional multiple-channel output LED drive power could be realized to LED power circuit using two-stage circuit
Constant current drives, and circuit is complicated, cost is high, two-stage circuit loss is big, overall efficiency is relatively low, the problems such as temperature rise, does not meet product
Energy-efficient requirement.
The content of the invention
The technical problems to be solved by the invention are：A kind of single-stage multiple-channel output LED power constant-current drive circuit is provided, it is real
Existing single-level circuit driving, and the multiple LED outputs of single power drives, improve the efficiency of power circuit.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：
A kind of single-stage multiple-channel output LED power constant-current drive circuit, including power module, energy supply control module, transformer,
Constant current constant voltage control module, signal generator module, output detection module and at least two LED load access passage；
The primary coil of the power module and energy supply control module respectively with the transformer is connected, the institute being arranged in parallel
The LED load access passage for stating at least two is connected with the secondary coil of the transformer；The constant current constant voltage control module point
It is not connected with the energy supply control module, the secondary coil of the transformer and the signal generator module；The signal is produced
Module accesses passage by the output detection module and the LED load and is connected；
The output detection module, when having electric current output for detecting described in one LED load access passage, sends one and believes
Number to the signal generator module；
The signal generator module, the port number of LED access is determined for the quantity according to the signal received；
And corresponding analog voltage is exported according to the port number, and the analog voltage is sent to constant current constant voltage control mould
Block；
The constant current constant voltage control module, after the analog voltage and reference voltage are compared, output is corresponding
Control signal is to the energy supply control module；
The energy supply control module, the power supply is controlled for receiving the control signal, and according to the control signal
Module adjusts the size of output current.
Another technical scheme that the present invention is provided is：
A kind of single-stage multiple-channel output LED power constant-current drive circuit, including power module, energy supply control module, transformer,
Module, output detection module and at least two LED load access passage occur for primary-side-control module, pwm signal；
The primary coil of the power module and energy supply control module respectively with the transformer is connected, the institute being arranged in parallel
The LED load access passage for stating at least two is connected with the secondary coil of the transformer；The primary-side-control module respectively with
Module connection occurs for the energy supply control module and the pwm signal；The pwm signal occurs module and detected by the output
Module is connected with LED load access passage；
The output detection module, when having electric current output for detecting described in one LED load access passage, sends one and believes
Number to the pwm signal occur module；
Module occurs for the pwm signal, and the passage of LED access is determined for the quantity according to the signal received
Number；And the pwm signal of corresponding dutycycle is exported according to the port number, and the pwm signal is sent to the primary side control
Molding block；
The primary-side-control module, for sending corresponding control signal to the power supply according to the pwm signal
Module；
The energy supply control module, the power supply is controlled for receiving the control signal, and according to the control signal
Module adjusts the size of output current.
The beneficial effects of the present invention are：Be different from the multiple-channel output constant current driver circuit for LED of prior art, it is necessary to using
Multiple power drives, and realized for two-stage circuit mode, circuit is complicated, and cost is high, and two-stage circuit loss is big, and efficiency is low asks
Topic.The present invention passes through output by adding output detection module and signal generator module in primary side feedback LED power circuit
Detection of the detection module to LED channel current, and signal generator module and constant current constant voltage control module cooperation, export phase
The control signal answered is to energy supply control module；Primary-side-control module, output inspection are then added in secondary side feedback LED power circuit
Survey module and module occurs for pwm signal；Detection again by output detection module to LED channel current, and pwm signal
Occur the cooperation of module and primary-side-control module, export corresponding control signal to energy supply control module；
The present invention realizes either primary side feedback or secondary side feedback LED power circuit, can be accessed according to LED load
The LED quantity of passage access carrys out the adaptive power supply that adjusts and exports suitable electric current, facilitates user's disassembled and assembled freely LED lamp；Together
When, and can realize LED multi-path light fixture just only can be driven by the power circuit of a power module and single-stage；Simplify LED power
Drive circuit, lifts the efficiency of LED power circuit, reduces the cost of power circuit.
Brief description of the drawings
Fig. 1 is the single-stage multiple-channel output LED drive power circuit schematic diagram of the primary side feedback of prior art；
Fig. 2 is the single-stage multiple-channel output LED drive power circuit schematic diagram of the secondary side feedback of prior art；
Fig. 3 is the circuit of the single-stage multiple-channel output LED power constant-current drive circuit of specific embodiment of the invention secondary side feedback
Principle schematic；
Fig. 4 is the circuit of the single-stage multiple-channel output LED power constant-current drive circuit of specific embodiment of the invention primary side feedback
Principle schematic；
Fig. 5 drags the schematic diagram of No. 2 output circuits for the LED power circuit one of specific embodiment of the invention primary side feedback；
Fig. 6 drags the schematic diagram of No. 2 output circuits for the LED power circuit one of specific embodiment of the invention secondary side feedback；
Fig. 7 drags the schematic diagram of No. 2 output circuits for the LED power circuit one of invention specific embodiment secondary side feedback；
Fig. 8 is the signal of the single-stage multiple-channel output LED power constant-current drive circuit of specific embodiment of the invention primary side feedback
Figure；
Fig. 9 is the signal of the single-stage multiple-channel output LED power constant-current drive circuit of specific embodiment of the invention secondary side feedback
Figure.
Embodiment
To describe technology contents, the objects and the effects of the present invention in detail, below in conjunction with embodiment and coordinate attached
Figure is explained.
The design of most critical of the present invention is：Pass through single-level circuit sentencing according to the access quantity of LED load access passage
It is disconnected, export the size that corresponding control signal controls output current to energy supply control module；Realize single power supply and single-stage power supply
Multiple-channel output is driven, circuit efficiency is improved, circuit cost is reduced.
Refer to PWM IC in Fig. 1 to Fig. 9, figure is energy supply control module.
As shown in Fig. 3,6,7 and 9, the present invention provides a kind of single-stage multiple-channel output LED power constant-current drive circuit, including electricity
Source module, energy supply control module, transformer, constant current constant voltage control module, signal generator module, output detection module and at least two
Individual LED load access passage；
The primary coil of the power module and energy supply control module respectively with the transformer is connected, the institute being arranged in parallel
The LED load access passage for stating at least two is connected with the secondary coil of the transformer；The constant current constant voltage control module point
It is not connected with the energy supply control module, the secondary coil of the transformer and the signal generator module；The signal is produced
Module accesses passage by the output detection module and the LED load and is connected；
The output detection module, when having electric current output for detecting described in one LED load access passage, sends one and believes
Number to the signal generator module；
The signal generator module, the port number of LED access is determined for the quantity according to the signal received；
And corresponding analog voltage is exported according to the port number, and the analog voltage is sent to constant current constant voltage control mould
Block；
The constant current constant voltage control module, after the analog voltage and reference voltage are compared, output is corresponding
Control signal is to the energy supply control module；
The energy supply control module, the power supply is controlled for receiving the control signal, and according to the control signal
Module adjusts the size of output current.
It was found from foregoing description, the beneficial effects of the present invention are：Increase signal in secondary side feedback power driving circuit
Generation module and output detection module；Realize secondary side feedback power circuit can single-stage drive multiple identical LEDs, and often increase
A LED that subtracts one, circuit by automatic detection, judge and control power module exports corresponding electric current；Electricity is driven by single-stage
Extreme efficiency is brought on road, and reduces the holistic cost of power circuit, and user can be met again according to demand disassembled and assembled freely LED,
It is user-friendly.
Further, the output detection module includes the output detection circuit and VCC power supply circuits being sequentially connected；
The output detection circuit, for the electric current detected to be converted into detection voltage；And by the detection voltage
It is compared with default detection reference voltage, the corresponding control level of output one to the signal generating module；
The VCC power supply circuits, for providing stable primary side operating voltage, reference voltage and detection reference voltage.
Seen from the above description, the judgement of passage output current is accessed to LED load by output detection circuit, in detection
(there is electric current output) and just sends a level signal to having when LED access, mould occurs for a preferably low level to signal
Block, is provided accurately for the follow-up constant current constant voltage control module control signal adaptable according to the level signal selection output received
Basis for estimation.
Further, the signal generator module include be sequentially connected light modulation incoming end, analog voltage generation circuit and
Partial pressure output circuit；
The light modulator incoming end, the dimmer voltage value for receiving active light modulator or the output of passive light modulator, and will
The dimmer voltage value is exported to the analog voltage generation circuit；
The analog voltage generation circuit, for producing corresponding simulation according to the port number and the dimmer voltage value
Voltage signal, and the analog voltage signal is exported to the partial pressure output circuit；
The partial pressure output circuit, for receiving after the analog voltage, by the analog voltage according to corresponding partial pressure
Than carrying out voltage division processing, the analog voltage after being handled, and send to the constant current constant voltage control module.
Seen from the above description, single-stage multiple-channel output LED power constant-current drive circuit of the invention is supported certain simultaneously
Dimming function in the range of analog voltage, realizes and LED load access passage or multichannel is dimmed, meet user's need
Ask.
Further, the analog voltage generation circuit, specifically for limiting adjustable maximum electricity according to the port number
Flow valuve, and produce corresponding mould in the range of the corresponding adjustable voltage value of the maximum current value according to the dimmer voltage value
Intend voltage；The analog voltage is exported to the constant current constant voltage control module.
Seen from the above description, signal generator module of the invention can be limited according to the port number of access LED load
Power module export to it is each access passage maximum current so that realize it is each load access passage LED, from close to
Dimmed in the maximal current regions of setting, it is to avoid LED input current is excessive and causes LED reduced lifetime, and defeated
Enter electric current how small and cause LED lamplight according to not enough.
As shown in Fig. 4,5 and 8, another technical scheme that the present invention is provided is：
A kind of single-stage multiple-channel output LED power constant-current drive circuit, including power module, energy supply control module, transformer,
Module, output detection module and at least two LED load access passage occur for primary-side-control module, pwm signal；
The primary coil of the power module and energy supply control module respectively with the transformer is connected, the institute being arranged in parallel
The LED load access passage for stating at least two is connected with the secondary coil of the transformer；The primary-side-control module respectively with
Module connection occurs for the energy supply control module and the pwm signal；The pwm signal occurs module and detected by the output
Module is connected with LED load access passage；
The output detection module, when having electric current output for detecting described in one LED load access passage, sends one and believes
Number to the pwm signal occur module；
Module occurs for the pwm signal, and the passage of LED access is determined for the quantity according to the signal received
Number；And the pwm signal of corresponding dutycycle is exported according to the port number, and the pwm signal is sent to the primary side control
Molding block；
The primary-side-control module, for sending corresponding control signal to the power supply according to the pwm signal
Module；
The energy supply control module, the power supply is controlled for receiving the control signal, and according to the control signal
Module adjusts the size of output current.
It was found from foregoing description, the beneficial effects of the present invention are：Increase primary side in primary side feedback power driving circuit
Module and output detection module occur for control module, pwm signal；Realize that primary side feedback power circuit being capable of the multiple phases of single-stage driving
Same LED, and often increase and decrease a LED, automatic detection, judgement and control power module are exported electricity accordingly by circuit
Stream；Extreme efficiency is brought by single-stage drive circuit, and reduces the holistic cost of power circuit, user can be met again according to need
Disassembled and assembled freely LED is sought, is user-friendly.
Further, the output detection module includes the output detection circuit and VCC power supply circuits being sequentially connected；
The output detection circuit, for the electric current detected to be converted into detection voltage；And by the detection voltage
It is compared with default detection reference voltage, module occurs for the corresponding control level of output one to the pwm signal；
The VCC power supply circuits, for providing stable primary side operating voltage, reference voltage and detection reference voltage.
Seen from the above description, the judgement of passage output current is accessed to LED load by output detection circuit, in detection
(there is electric current output) and just sends a level signal to having when LED access, a preferably low level to pwm signal occurs
Module, for the rear primary-side-control module control signal adaptable according to the pwm signal output received provides it is accurate judge according to
According to.
Further, light modulator incoming end, the simulation electricity that module includes being sequentially connected occur for the pwm signal
Press generation circuit, 0-10V conversion pwm circuits and PWM transmission circuits；
The light modulator incoming end, the dimmer voltage value for receiving active light modulator or the output of passive light modulator, and will
The dimmer voltage value is exported to the analog voltage generation circuit；
The analog voltage generation circuit, for producing corresponding simulation according to the port number and the dimmer voltage value
Voltage, and the analog voltage is exported to 0-10V conversion pwm circuits；
The 0-10V changes pwm circuit, is exported for the analog voltage to be converted into corresponding pwm signal to described
PWM transport modules；
The PWM transmission circuits, for the pwm signal amplification of input to be transmitted to the control module.
Seen from the above description, on the basis of primary side feedback power driving circuit realizes single-stage multiple-channel output, also support
0-10V analog voltage dimming function, realizes the dimming function that passage or multichannel are accessed to a LED load, better meets
The demand of user.
Further, the analog voltage generation circuit, specifically for limiting adjustable maximum electricity according to the port number
Flow valuve, and produce corresponding mould in the range of the corresponding adjustable voltage value of the maximum current value according to the dimmer voltage value
Intend voltage；The analog voltage is exported to the 0-10V and changes pwm circuit.
Seen from the above description, in single-stage multiple-channel output primary side feedback power driving circuit of the invention, the pwm signal
The LED string number of passage can also be accessed according to actual access LED load by occurring module, produce the simulation electricity of corresponding output current
Pressure, and support the control of external light modulator to realize the light modulation in certain analog voltage range value, further, moreover it is possible to realize intelligence
Energyization limits power module according to the quantity for having the LED load that electric current is exported to access passage, i.e. the LED quantity of reality access
Export to the maximum current of each passage, so that each the LED of access passage is supported on the maximum current closed to limiting
Dimmed in region, the suitable current value that each LED load access passage of intelligentized control method is exported in the ideal range.
Further, the 0-10V conversions pwm circuit includes three-level discharge circuit；The three-level discharge circuit includes phase
The sawtooth wave generating circuit and pwm signal generation circuit connected；
The sawtooth wave generating circuit is made up of preceding two stage amplifer, for the analog voltage of input to be converted into corresponding frequencies
Exported with the sawtooth waveforms of amplitude to pwm signal generation circuit；
The pwm signal generation circuit is made up of third level amplifier, for receiving dimmer voltage value and the sawtooth waveforms；Than
Compared with dimmer voltage value and sawtooth waveforms, the linear relationship between sawtooth waveforms and the value range of dimmer voltage is obtained；According to described linear
Relation exports corresponding pwm signal.
Seen from the above description, 0-10V changes pwm circuit and produced by three-level discharge circuit, preceding two stage amplifer circuit composition
Sawtooth wave generating circuit, the frequency of the sawtooth waveforms of sawtooth wave generating circuit output and the PWM frequency identical of output, sawtooth waveforms production
Raw circuit is exported to pwm signal generation circuit after producing sawtooth waveforms；
Pwm signal generation circuit is exported accordingly after treatment according to the dimmer voltage value of light modulator input input
Pwm signal, specifically：
When light modulator incoming end access be passive light modulator when, the passive light modulator can be variable resistor；First
Produce in basic voltage, dimming process, by exporting the voltage in certain limit value after basic voltage is dragged down；
When light modulator incoming end access be active light modulator when, preferably described active light modulator be 0-10V light modulators, institute
State active light modulator and export 0-10V voltages to pwm signal generation circuit；By pwm signal generation circuit by the magnitude of voltage of input
It is compared with sawtooth waveforms, output pwm signal is worth linear relationship with input voltage after comparing, then defeated according to the linear relationship
Go out corresponding pwm signal；
When light modulator incoming end is without external light modulator, pwm signal generation circuit exports the pwm signal of maximum duty cycle.
Further, the primary-side-control module includes output current adjustment circuit, output voltage controlling circuit and VCC confessions
Circuit；
The input of the output current adjustment circuit connects the pwm signal and occurs module, and output end connects institute respectively
State the primary coil of energy supply control module, the VCC power supply circuits and transformer；
The input of the output voltage controlling circuit connects the pwm signal and occurs module, and output end connects institute respectively
State VCC power supply circuits and energy supply control module；
The VCC power supply circuits are also connected with the primary coil and the energy supply control module of the transformer.
Fig. 4,5 and 8 are refer to, embodiments of the invention one are：
A kind of primary side feedback single-stage multiple-channel output LED power constant-current drive circuit, including power module, power supply mould
It is logical that module, output detection module and the access of at least two LED load occur for block, transformer, primary-side-control module, pwm signal
Road；
The output detection module includes the output detection circuit and VCC power supply circuits being sequentially connected；
Light modulator incoming end, analog voltage generation circuit, the 0-10V that module includes being sequentially connected occur for the pwm signal
Change pwm circuit and PWM transmission circuits；
The primary-side-control module includes output current adjustment circuit and the output voltage controlling circuit being connected with each other；
The primary coil of the power module and energy supply control module respectively with the transformer is connected, the institute being arranged in parallel
The LED load access passage for stating at least two is connected with the secondary coil of the transformer；The primary-side-control module respectively with
Module connection occurs for the energy supply control module and the pwm signal, specifically, the output electricity of the primary-side-control module
The input for flowing adjustment circuit and the output voltage controlling circuit connects the pwm signal generation module, and output end connects respectively
Connect the primary coil of the energy supply control module and transformer；The pwm signal occurs module and passes through the output detection module
It is connected with LED load access passage.
As shown in figure 5, LED load access passage can match one drag two LED lamp tube, one drag three LED lamp tubes, and
One drags the light fixture of N number of LED lamp tube, and above-mentioned LED power supply reduces the holistic cost of power supply, meets the demand saved now, together
When reduce the holistic cost of LED lamp.
Fig. 5 and 8 are refer to, on the basis of embodiment one, embodiments of the invention two are：
The output detection module includes the output detection circuit and VCC power supply circuits being sequentially connected；Specifically：
The output detection circuit include resistance R46, R63, R71, R45, R47, R36, electric capacity C27, C21, C20, C24,
C22 and photoisolator IC7；Specific operation principle is as follows：
Channel LED 1+ is accessed into LED load when there is LED to concatenate, during LED1-, there will be electric current to pass through R36, R36 will be produced
The detection reference voltage that one voltage is set by R46 the 3rd pin IN+ and the 2nd pin for being given to photoisolator IC7 amplifiers
It is compared, a low level is exported more afterwards, tells pwm signal to occur first LED load access passage of module and access
LED.Resistance R63 plays a part of acceleration detection process；Electric capacity C20, C21 and C27 are used for filtering circuit clutter, prevent circuit
Misoperation.
Similarly, second LED load access passage has LED to access LED2+, during LED2-, will have electric current to cross R47, R47
The detection base that a voltage is set by R45 the 5th pin IN+ and the 6th pin for being given to photoisolator IC7 amplifiers will be produced
Quasi- voltage is compared, and a low level is exported more afterwards, tells pwm signal to occur second LED load access passage of module
LED is accessed.Likewise, R71 plays a part of acceleration detection process；Electric capacity C22 and C24 are used for filtering circuit clutter, in advance
Anti- circuit erroneous action.
The VCC power supply circuits include resistance R74, R75, R102, R104, R103, R87, R82, R37, R105, R79,
R106, electric capacity C38, C39, C40, C55, C57, C26, photoisolator IC2, IC8, metal-oxide-semiconductor Q9, Q123 and voltage-stabiliser tube ZD2；With
In providing stable+15VCC operating voltages ,+2.5V reference voltages, also adjustable detection reference voltage, the benchmark of passage is adjusted
Photovoltage.
Light modulator incoming end, analog voltage generation circuit, the 0-10V that module includes being sequentially connected occur for the pwm signal
Change pwm circuit and PWM transmission circuits；The 0-10V conversions pwm circuit includes three-level discharge circuit；The three-level amplifier electricity
The sawtooth wave generating circuit and pwm signal generation circuit that road includes being connected with each other are specific：
The analog voltage generation circuit include resistance R39, R94, R40, R85, R108, R88, R49, R43, R109,
R44, R72, R69, R68, R38, R107, electric capacity C10, C11, C23, C56, C26, voltage-stabiliser tube ZD5, ZD4, metal-oxide-semiconductor Q8, Q10,
Q4, Q5 and photoisolator IC10；Wherein, C56, R72, ZD5 and ZD4 constitute dimming input circuit, the light modulation input electricity
Road is connected with the light modulator incoming end, and the light modulator incoming end can support two kinds of input patterns, and one kind is passive light modulation
Device, one kind is active light modulator；
After passive light modulator is accessed, 10V basic voltage is produced by R72, ZD5 and C56, passes through the external nothings of R69 and R68
Source light modulator, actual is exactly variable resistor, and basic voltage is dragged down by R68 during light modulation, forms the 0-10V analog voltages of light modulation
(INPUT-V)。
After active light modulator is accessed, the 0-10V voltages of outside 0-10V light modulators output are dimmed by R68, formation
Analog voltage (INPUT-V)；ZD4 plays voltage-limiting protection effect, and when outside has higher than 10V control sources, ZD4 plays pressure limiting
Effect；C54 plays the light modulation that buffered analog variation in voltage brings and flashed；
The light modulation analog voltage of generation, Q10 is conveyed to in main multichannel analog voltage control circuit by metal-oxide-semiconductor Q8；
The level signal of the output detection module output, Q5 is driven by R94；R85 drives Q4；Born when there is a LED
When load access passage has accessed LED, such as LED1 passages access LED, output detection module exports the low electricity of the passage
Put down the analog voltage generation circuit for occurring module to the pwm signal, driving metal-oxide-semiconductor Q5 conductings, the base of passage after Q5 conductings
In quasi- dimmer voltage Vn, the add circuit for being sent to IC10 compositions, carry out being added the analog voltage for improving Q10 outputs, give subordinate's mould
Block (0-10V changes pwm circuit) lifting drives the LED1 passages of access to the electric current set.Similarly, if detecting second
LED load access passage has output current, i.e. LED2 passages have accessed LED, are also same operation principle；
The dimmer voltage Vn of benchmark represents the output current of each passage, when accessing a passage, and the 7 of IC10 outputs
N-VT voltages=VN of pin, IC10 exports N-VT voltages=VN+VN of 7 pin when two passages are accessed；So ensure that
Can be with the electric current of multi output at double per the output current of one channel power source of multiple access.Passage is regardless of order, arbitrarily access.Formula
For：Export each channel currents of total current=N*；
The N-VT voltages of IC10 outputs pass to 0-10V by Q10 and change pwm circuit.
The quantity for the LED string that above-mentioned analog voltage generation circuit can be accessed according to reality, produces corresponding output current
Analog voltage, and the control of external light modulator is supported, it is achieved thereby that LED power circuit can be according to there is LED access
LED load access number of channels limit power module and export to the maximum current of each passage so that the LED of each passage
Lamp is dimmed from closing in the maximal current regions limited.
The 0-10V conversions pwm circuit is produced by three-level discharge circuit, including integrated IC3 (1)-(7) pin, resistance R62,
R61, R60, R50, R52, R58, R59, R77, electric capacity C52, C50, C53, C51, C54 and diode D8.Preceding two stage amplifer composition
Sawtooth wave generating circuit, resistance R62 and electric capacity C52 discharge and recharges determine the frequency of sawtooth waveforms, the frequency and the pwm signal of output
Frequency is identical；Resistance R60 and R61 determine the amplitude of sawtooth waveforms, and R50, R52 and C50 provide amplifier reference center electrical voltage point, be
Can and 10V voltage ratios compared with the amplitude of sawtooth waveforms must be over 10Vo-p.Preceding two stage amplifer circuit is produced by integrated IC3 (1)
The sawtooth waveforms of pin output, is transferred to third level discharge circuit pwm signal by electric capacity C53, resistance R58 and diode D8 and produces electricity
Road produces pwm signal；
Pwm signal generation circuit includes integrated IC3 (8)-(10) pin, and R59, C54 and R77 composition, specific work are former
Manage and be：After the analog voltage of the analog voltage generation circuit output is received, analog voltage is inputed to by R77 and C54
Third level amplifier "+"；Sawtooth waveforms has filtered out dc component by C53 simultaneously, and the sawtooth waveforms of exchange is transmitted into third level amplifier
Input "-" end；Resistance R58 and diode D8 plays the linear of the PWM that clampers and improvement third level amplifier export more afterwards and 0-10V
Relation；Last third level amplifier is transmitted by IC3 the 8th pin output pwm signal proportional to analog voltage to the PWM
Circuit.
The PWM transmission circuits include resistance R53, R54, R55, R56, R57, R79, R71, photoisolator IC5, three poles
Pipe Q6, Q7 and electric capacity C57；Triode is transferred to by R71, R79 and C57 when external-connected port PWM+ inputs pwm signal
Q7 and Q6 are amplified driving photoisolator IC5 and pass to the primary-side-control module；As outside DIM+, pass through 0-10V
Conversion pwm circuit output pwm signal passes through R57, and R56, which is transferred to Q7 and Q6 and is amplified driving photoisolator IC5, to be passed to
Primary-side-control module.
Fig. 5 and 8 are refer to, on the basis of embodiment one, embodiments of the invention three are：
The pwm signal generation module also includes opening and closing control module, and the keying control module connects the original respectively
Side control module and 0-10V change the pwm signal generation circuit of pwm circuit；
The keying control module resistance R67, R66, R70, R64, R65, R78, R73, R76, R47, R63, Phototube Coupling
Device IC4, electric capacity C55 and triode Q8.R64, R65, R78 and IC4 composition benchmark 1.0V；Switching voltage signal takes third level amplifier
Circuit input "+" end, i.e., integrated IC3 IN3+ pin are compared by the voltage after R67, R66 and R70 and benchmark 1.0V, low
When 1.0V, tertiary circuit output low level drives triode Q8 to turn on, by photoisolator IC6 by R76 and R47
The diode current flow in portion is lighted, and electric power output voltage is reduced, so as to close output current, LED closed.R73 rises back stagnant
Effect, accelerates closing motion and breakdown action, it is to avoid causes and is flashed caused by switch.
The keying control module realizes the opening and closing to LED circuit power supply.
The primary-side-control module, the primary-side-control module includes output current adjustment circuit, output voltage control electricity
Road and VCC power supply circuits；
Output current adjustment circuit includes resistance R34, R28, R29, R30, R31, electric capacity C17, C18, C19 and Phototube Coupling
Device IC5；When LED circuit is normal uncomfortable smooth, PSR IC energy supply control modules control the output current of power module, by metal-oxide-semiconductor Q1
Produce primary current and give PSR IC energy supply control modules through R23 one Voltage Feedback of generation, energy supply control module is according to transformer
The parameter such as turn ratio, corresponding drive waveforms are exported by GATE pin so that LED circuit power supply realizes constant current.
Output current adjustment circuit is received occurs the pwm signal that module is produced by the pwm signal, and pwm signal is through photoelectricity
Isolator IC5 isolation amplification output pwm signals, by resistance R30, R31, R29, R28, electric capacity C18, C19 are integrated into a tune
The control voltage of whole electric current, the control voltage is higher than normal constant current feedback voltage, control voltage input PSR IC power supply controls
The current sense pin of molding block；PSR IC energy supply control modules are received after the control voltage, and adjustment GATE pin outputs are maximum
Ratio or the pwm signal of frequency are taken, so as to adjust the output current of power supply, the purpose of light modulation is reached.
The output voltage controlling circuit includes resistance R36, R35, R26 and photoisolator IC6, is opening and closing control module
After output switching signal, pass through the triode inside photoisolator IC6 isolation drives, when LED lamp needs to close, IC6
Internal triode receives the signal conduction of IC6 light emitting diodes, primary side VCC by resistance R35, R36 and R26 partial pressure export to
The unloaded limitation pin ZCS of PSR IC energy supply control modules；And by adjusting resistance R35 and R36 intrinsic standoff ratio, can be less than
LED has just started luminous lower limit, it is ensured that LED circuit power supply is operated in no-load standby state without output current；
Conversely, when the diode inside photoisolator IC6 ends, the triode being attached thereto is also switched off, primary side VCC
Voltage be not superimposed upon on resistance R26, and by the auxiliary winding output voltage of the certain turn ratio of transformer, the voltage of output passes through electricity
Hinder to export the power supply of LED circuit after R25, R24 and R26 intrinsic standoff ratio and bring up to original setting value.
VCC power supply circuits constitute mu balanced circuit by resistance R32 and voltage-regulator diode ZD3；Because LED circuit is in dimming process
In diminishing with output current, output voltage also diminishes therewith, the voltage that transformer secondary winding is produced also step-down therewith,
The mu balanced circuit that VCC power supply circuits are constituted can be good at ensureing the linear stable in dimming process.
Fig. 6,7 and 9 are refer to, embodiments of the invention four are：
A kind of single-stage multiple-channel output LED power constant-current drive circuit of secondary side feedback, including power module, power supply mould
Block, transformer, constant current constant voltage control module, signal generator module, output detection module and the access of at least two LED load are logical
Road；
The output detection module includes the output detection circuit and VCC power supply circuits being sequentially connected；
The signal generator module includes light modulation incoming end, analog voltage generation circuit and partial pressure the output electricity being sequentially connected
Road；
The primary coil of the power module and energy supply control module respectively with the transformer is connected, the institute being arranged in parallel
The LED load access passage for stating at least two is connected with the secondary coil of the transformer；The constant current constant voltage control module point
It is not connected with the energy supply control module, the secondary coil of the transformer and the signal generator module；The signal is produced
Module accesses passage by the output detection module and the LED load and is connected；
Wherein, the element composition and operation principle of the output detection module refer to embodiment two；
The analog voltage of the analog voltage generation module output will enter by the R33 and R34 of the partial pressure output circuit
After row voltage division processing, obtain being adapted to the analog voltage that the constant current constant voltage control module is used to control energy supply control module, realize
The multichannel output of secondary side feedback single-stage multiple-channel output LED power constant-current drive circuit and dimming function.
As shown in Figures 6 and 7, LED load access passage can match one drag two LED lamp tube, one drag three LED lamp tubes,
And the light fixture for dragging N number of LED lamp tube.
In summary, a kind of single-stage multiple-channel output LED power constant-current drive circuit that the present invention is provided, respectively for primary side
Feed back LED power circuit structure and secondary side feedback LED power circuit structure carries out innovative improvement, realize either primary side anti-
Feedback or secondary side feedback LED power circuit, the LED quantity that passage access can be accessed according to LED load are adaptively adjusted
Power supply exports suitable electric current, supports single power drives multiplexer channel output；Meanwhile, LED electricity is realized using single-level circuit
The linearity light adjusting function of source circuit；Further, while ensureing that LED circuit can stablize constant current output, and it can support many
The dim signal for planting input type carries out the adjustment of electric power outputting current, and flexibly opens and closes LED output currents；Realization is improved
The whole efficiency of LED circuit power supply, reduces circuit loss, reduces circuit cost, meets the demand of current energy-conserving and environment-protective.
Embodiments of the invention are the foregoing is only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalents that bright specification and accompanying drawing content are made, or the technical field of correlation is directly or indirectly used in, similarly include
In the scope of patent protection of the present invention.
Claims (9)
1. a kind of single-stage multiple-channel output LED power constant-current drive circuit, it is characterised in that including power module, power supply mould
Block, transformer, constant current constant voltage control module, signal generator module, output detection module and the access of at least two LED load are logical
Road；
The primary coil of the power module and energy supply control module respectively with the transformer is connected, be arranged in parallel it is described extremely
Few two LED load access passage is connected with the secondary coil of the transformer；The constant current constant voltage control module respectively with
The energy supply control module, the secondary coil of the transformer and signal generator module connection；The signal generator module
Passage is accessed by the output detection module and the LED load to be connected；
The output detection module, when having electric current output for detecting described in one LED load access passage, sends a signal to
The signal generator module；
The signal generator module, the port number of LED access is determined for the quantity according to the signal received；And
Corresponding analog voltage is exported according to the port number, and the analog voltage is sent to the constant current constant voltage control module；
The constant current constant voltage control module, after the analog voltage and reference voltage are compared, the corresponding control of output
Signal is to the energy supply control module；
The energy supply control module, the power module is controlled for receiving the control signal, and according to the control signal
Adjust the size of output current；
The output detection module includes the output detection circuit and VCC power supply circuits being sequentially connected；
The output detection circuit, for the electric current detected to be converted into detection voltage；And by the detection voltage and in advance
If detection reference voltage be compared, the corresponding control level of output one is to the signal generating module；
The VCC power supply circuits, for providing stable primary side operating voltage, reference voltage and detection reference voltage.
2. according to a kind of single-stage multiple-channel output LED power constant-current drive circuit described in claim 1, it is characterised in that described
Signal generator module includes light modulation incoming end, analog voltage generation circuit and the partial pressure output circuit being sequentially connected；
The light modulator incoming end, the dimmer voltage value for receiving active light modulator or the output of passive light modulator, and will be described
Dimmer voltage value is exported to the analog voltage generation circuit；
The analog voltage generation circuit, for producing corresponding simulation electricity according to the port number and the dimmer voltage value
Pressure, and the analog voltage is exported to the partial pressure output circuit；
The partial pressure output circuit, for receiving after the analog voltage, the analog voltage is entered according to corresponding intrinsic standoff ratio
Row voltage division processing, obtains the analog voltage after voltage division processing, and send to the constant current constant voltage control module.
3. according to a kind of single-stage multiple-channel output LED power constant-current drive circuit described in claim 2, it is characterised in that described
Analog voltage generation circuit, specifically for limiting adjustable maximum current value according to the port number, and according to the light modulation
Magnitude of voltage produces corresponding analog voltage in the range of the corresponding adjustable voltage value of the maximum current value；By the analog voltage
Export to the constant current constant voltage control module.
4. a kind of single-stage multiple-channel output LED power constant-current drive circuit, it is characterised in that including power module, power supply mould
It is logical that module, output detection module and the access of at least two LED load occur for block, transformer, primary-side-control module, pwm signal
Road；
The primary coil of the power module and energy supply control module respectively with the transformer is connected, be arranged in parallel it is described extremely
Few two LED load access passage is connected with the secondary coil of the transformer；The primary-side-control module respectively with it is described
Module connection occurs for energy supply control module and the pwm signal；The pwm signal occurs module and passes through the output detection module
It is connected with LED load access passage；
The output detection module, when having electric current output for detecting described in one LED load access passage, sends a signal to
Module occurs for the pwm signal；
Module occurs for the pwm signal, and the port number of LED access is determined for the quantity according to the signal received；
And the pwm signal of corresponding dutycycle is exported according to the port number, and the pwm signal is sent to the primary-side-control mould
Block；
The primary-side-control module, for sending corresponding control signal to the energy supply control module according to the pwm signal；
The energy supply control module, the power module is controlled for receiving the control signal, and according to the control signal
Adjust the size of output current.
5. according to a kind of single-stage multiple-channel output LED power constant-current drive circuit described in claim 4, it is characterised in that described
Output detection module includes the output detection circuit and VCC power supply circuits being sequentially connected；
The output detection circuit, for the electric current detected to be converted into detection voltage；And by the detection voltage and in advance
If detection reference voltage be compared, output one it is corresponding control level to the pwm signal occur module；
The VCC power supply circuits, for providing stable primary side operating voltage, reference voltage and detection reference voltage.
6. according to a kind of single-stage multiple-channel output LED power constant-current drive circuit described in claim 4, it is characterised in that described
Pwm signal occur module include be sequentially connected light modulator incoming end, analog voltage generation circuit, 0-10V conversion pwm circuit and
PWM transmission circuits；
The light modulator incoming end, the dimmer voltage value for receiving active light modulator or the output of passive light modulator, and will be described
Dimmer voltage value is exported to the analog voltage generation circuit；
The analog voltage generation circuit, for producing corresponding simulation electricity according to the port number and the dimmer voltage value
Pressure, and the analog voltage is exported to 0-10V conversion pwm circuits；
The 0-10V changes pwm circuit, is exported for the analog voltage to be converted into corresponding pwm signal to PWM biographies
Defeated module；
The PWM transmission circuits, for the pwm signal amplification of input to be transmitted to the control module.
7. according to a kind of single-stage multiple-channel output LED power constant-current drive circuit described in claim 6, it is characterised in that described
Analog voltage generation circuit, specifically for limiting adjustable maximum current value according to the port number, and according to the light modulation
Magnitude of voltage produces corresponding analog voltage in the range of the corresponding adjustable voltage value of the maximum current value；By the analog voltage
Export to the 0-10V and change pwm circuit.
8. according to a kind of single-stage multiple-channel output LED power constant-current drive circuit described in claim 6, it is characterised in that described
0-10V conversion pwm circuits include three-level discharge circuit；The three-level discharge circuit includes the sawtooth wave generating circuit being connected with each other
And pwm signal generation circuit；
The sawtooth wave generating circuit is made up of preceding two stage amplifer, for the analog voltage of input to be converted into corresponding frequencies and width
The sawtooth waveforms of degree is exported to pwm signal generation circuit；
The pwm signal generation circuit is made up of third level amplifier, for receiving dimmer voltage value and the sawtooth waveforms；Compare tune
Photovoltage value and sawtooth waveforms, obtain the linear relationship between sawtooth waveforms and the value range of dimmer voltage；According to the linear relationship
Export corresponding pwm signal.
9. according to a kind of single-stage multiple-channel output LED power constant-current drive circuit described in claim 4, it is characterised in that described
Primary-side-control module includes output current adjustment circuit, output voltage controlling circuit and VCC power supply circuits；
The input of the output current adjustment circuit connects the pwm signal and occurs module, and output end connects the electricity respectively
The primary coil of source control module, the VCC power supply circuits and transformer；
The input of the output voltage controlling circuit connects the pwm signal and occurs module, and output end connects the VCC respectively
Power supply circuit and energy supply control module；
The VCC power supply circuits are also connected with the primary coil and the energy supply control module of the transformer.
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| CN201510190327.4A CN104883773B (en) | 2015-04-21 | 2015-04-21 | A kind of single-stage multiple-channel output LED power constant-current drive circuit |
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| CN201510190327.4A CN104883773B (en) | 2015-04-21 | 2015-04-21 | A kind of single-stage multiple-channel output LED power constant-current drive circuit |
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| CN104883773B true CN104883773B (en) | 2017-07-25 |
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| CN107155238B (en) * | 2017-06-13 | 2019-02-05 | 深圳民爆光电技术有限公司 | A kind of multiple-channel output constant current driver circuit for LED and driving method |
| CN107911902A (en) * | 2017-11-30 | 2018-04-13 | 广东新昇电业科技股份有限公司 | A kind of doubleway output switch toning circuit temperature |
| CN111614272A (en) * | 2020-06-18 | 2020-09-01 | 福建省中科生物股份有限公司 | Centralized power supply type load driving method and system |
| CN112351547B (en) * | 2020-12-04 | 2022-05-10 | 华源智信半导体(武汉)有限公司 | Intelligent adjusting method and system for driving LED |
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| CN2699561Y (en) * | 2004-03-17 | 2005-05-11 | 毛锦铭 | Lithium battery charger |
| TW201116158A (en) * | 2009-10-16 | 2011-05-01 | Himax Display Inc | Current-type driver of light emitting device |
| CN203618199U (en) * | 2013-12-26 | 2014-05-28 | 北斗照明科技（深圳）有限公司 | LED intelligent driver |
| CN104066244A (en) * | 2014-06-16 | 2014-09-24 | 上海大学 | Universal LED simulation dimming circuit |
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2015
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2699561Y (en) * | 2004-03-17 | 2005-05-11 | 毛锦铭 | Lithium battery charger |
| TW201116158A (en) * | 2009-10-16 | 2011-05-01 | Himax Display Inc | Current-type driver of light emitting device |
| CN203618199U (en) * | 2013-12-26 | 2014-05-28 | 北斗照明科技（深圳）有限公司 | LED intelligent driver |
| CN104066244A (en) * | 2014-06-16 | 2014-09-24 | 上海大学 | Universal LED simulation dimming circuit |
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