CN104883773A - Single-stage multi-output LED power supply constant current drive circuit - Google Patents
Single-stage multi-output LED power supply constant current drive circuit Download PDFInfo
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Abstract
The present invention provides a single-stage multi-output LED power supply constant current drive circuit. The single-stage multi-output LED power supply constant current drive circuit comprises a power supply module, a power supply control module, a transformer, a constant current constant voltage control module, a signal generating module, an output detection module and at least two LED load access channels. The constant current constant voltage control module is connected with the power supply control module, a secondary-side coil of the transformer and the signal generating module separately, the signal generating module is connected with the LED load access channels via the output detection module, and the output detection module sends a signal when detecting that one LED load access channel outputs a current. The signal generating module determines the channel number of the LED lamp access and outputs a corresponding analog voltage according to the channel number, and the constant current constant voltage control module outputs a corresponding control signal, and the power supply control module controls the power supply module to adjust an output current according to the control signal. The single-stage multi-output LED power supply constant current drive circuit of the present invention realizes the single-stage circuit driving, and realizes the situation that one power supply drives a plurality of LED lamps, thereby improving the efficiency of a power supply circuit.
Description
Technical field
The present invention relates to LED circuit field, specifically be a kind of single-stage multiple-channel output LED power constant-current drive circuit.
Background technology
Existing multiple-channel output LED drive power has following two kinds:
As shown in Figure 1, common secondary constant-current LED power is adopted to change into constant DC voltage; Constant DC voltage carries out output multi-channel driving LED by buck or boost circuit again;
As shown in Figure 2, common former limit constant current LED power supplies is adopted to change into constant DC voltage.Constant DC voltage carries out output multi-channel driving LED by buck or boost circuit again;
Number of patent application is " a kind of multiple-channel output height step-down LED constant current driving power " of 201410499908.1, disclose one and comprise PFC rectification circuit and the two-part LED driving of DC/DC step-down constant current link, by being improved to the converter formation possessing high step-down ability, multiple-channel output ability in DC/DC step-down constant current link, converter input is the high pressure 400V direct current that PFC rectification exports, output multi-channel constant current drive current, each road drive current drives one group of LED illumination lamp.Although this patent solves too much LED and to connect the poor reliability problem caused, but the output automatically adjusting electric current according to the quantity of the LED of access cannot be realized, and not support analog voltage dimming function.
Above-mentioned traditional multiple-channel output LED drive power is all adopt two-stage circuit could realize driving the constant current of LED power circuit, circuit is complicated, cost is high, two-stage circuit loss is large, overall efficiency is lower, the problems such as temperature rise is high, do not meet the requirement that product is energy-efficient.
Summary of the invention
Technical problem to be solved by this invention is: provide a kind of single-stage multiple-channel output LED power constant-current drive circuit, realizes single-level circuit and drives, and the multiple LED of single power drives exports, and improves the efficiency of power circuit.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
A kind of single-stage multiple-channel output LED power constant-current drive circuit, comprises the LED load access passage of power module, energy supply control module, transformer, constant current constant voltage control module, signal generator module, output detections module and at least two;
Described power module and energy supply control module are connected with the primary coil of described transformer respectively, and the LED load access passage of described at least two that are arranged in parallel is connected with the secondary coil of described transformer; Described constant current constant voltage control module is connected with the secondary coil of described energy supply control module, described transformer and described signal generator module respectively; Described signal generator module accesses expanding channels by described output detections module and described LED load;
Described output detections module, during for detecting that described in one, LED load access passage has electric current to export, sends a signal to described signal generator module;
Described signal generator module, for the port number of the quantity determination LED access according to the described signal received; And export corresponding analog voltage according to described port number, and described analog voltage is sent to described constant current constant voltage control module;
Described constant current constant voltage control module, after described analog voltage and reference voltage being compared, exports and controls signal to described energy supply control module accordingly;
Described energy supply control module, for receiving described control signal, and controls the size of described power module adjustment output current according to described control signal.
Another technical scheme provided by the invention is:
A kind of single-stage multiple-channel output LED power constant-current drive circuit, comprises the LED load access passage of power module, energy supply control module, transformer, former limit control module, pwm signal generation module, output detections module and at least two;
Described power module and energy supply control module are connected with the primary coil of described transformer respectively, and the LED load access passage of described at least two that are arranged in parallel is connected with the secondary coil of described transformer; Described former limit control module respectively with described energy supply control module and described pwm signal generation model calling; Described pwm signal generation module accesses expanding channels by described output detections module and described LED load;
Described output detections module, during for detecting that described in one, LED load access passage has electric current to export, sends a signal to described pwm signal generation module;
Described pwm signal generation module, for the port number of the quantity determination LED access according to the described signal received; And export the pwm signal of corresponding duty ratio according to described port number, and described pwm signal is sent to described former limit control module;
Described former limit control module, controls signal to described energy supply control module accordingly for sending according to described pwm signal;
Described energy supply control module, for receiving described control signal, and controls the size of described power module adjustment output current according to described control signal.
Beneficial effect of the present invention is: the multiple-channel output constant current driver circuit for LED being different from prior art, needs to adopt multiple power drives, and realizes for two-stage circuit mode, and circuit is complicated, and cost is high, and two-stage circuit loss is large, the problems such as efficiency is low.The present invention by adding output detections module and signal generator module in the feedback LED power circuit of former limit, by the detection of output detections module to LED channel current, and the cooperation of signal generator module and constant current constant voltage control module, export and control signal to energy supply control module accordingly; Former limit control module, output detections module and pwm signal generation module is then added in secondary side feedback LED power circuit; Same output detections module of passing through is to the detection of LED channel current, and the cooperation of pwm signal generation module and former limit control module, exports and controls signal to energy supply control module accordingly;
No matter present invention achieves is former limit feedback or secondary side feedback LED power circuit, and the LED quantity that can access passage access according to LED load is carried out self-adaptative adjustment power supply and exported suitable electric current, facilitates user's disassembled and assembled freely LED lamp; Meanwhile, the power circuit that can realize again by means of only a power module and single-stage just can drive LED multi-path light fixture; Simplify LED power drive circuit, promote the efficiency of LED power circuit, reduce the cost of power circuit.
Accompanying drawing explanation
Fig. 1 is the single-stage multiple-channel output LED drive power circuit schematic diagram of the former limit 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 theory schematic diagram of the single-stage multiple-channel output LED power constant-current drive circuit of specific embodiment of the invention secondary side feedback;
Fig. 4 is the circuit theory schematic diagram of the single-stage multiple-channel output LED power constant-current drive circuit of the specific embodiment of the invention former limit feedback;
Fig. 5 is the schematic diagram that the LED power circuit one of the specific embodiment of the invention former limit feedback drags No. 2 output circuits;
Fig. 6 is the schematic diagram that the LED power circuit one of specific embodiment of the invention secondary side feedback drags No. 2 output circuits;
Fig. 7 is the schematic diagram that the LED power circuit one of invention specific embodiment secondary side feedback drags No. 2 output circuits;
Fig. 8 is the schematic diagram of the single-stage multiple-channel output LED power constant-current drive circuit of the specific embodiment of the invention former limit feedback;
Fig. 9 is the schematic diagram of the single-stage multiple-channel output LED power constant-current drive circuit of specific embodiment of the invention secondary side feedback.
Embodiment
By describing technology contents of the present invention in detail, realized object and effect, accompanying drawing is coordinated to be explained below in conjunction with execution mode.
The design of most critical of the present invention is: by the judgement of single-level circuit according to the access quantity of LED load access passage, export and control signal to the size that energy supply control module controls output current accordingly; Realize single power supply and single-stage power supply driving multiple-channel output, improve circuit efficiency, reduce circuit cost.
Please refer to Fig. 1 to Fig. 9, PWM IC and energy supply control module in figure.
As Fig. 3,6, shown in 7 and 9, the invention provides a kind of single-stage multiple-channel output LED power constant-current drive circuit, comprise the LED load access passage of power module, energy supply control module, transformer, constant current constant voltage control module, signal generator module, output detections module and at least two;
Described power module and energy supply control module are connected with the primary coil of described transformer respectively, and the LED load access passage of described at least two that are arranged in parallel is connected with the secondary coil of described transformer; Described constant current constant voltage control module is connected with the secondary coil of described energy supply control module, described transformer and described signal generator module respectively; Described signal generator module accesses expanding channels by described output detections module and described LED load;
Described output detections module, during for detecting that described in one, LED load access passage has electric current to export, sends a signal to described signal generator module;
Described signal generator module, for the port number of the quantity determination LED access according to the described signal received; And export corresponding analog voltage according to described port number, and described analog voltage is sent to described constant current constant voltage control module;
Described constant current constant voltage control module, after described analog voltage and reference voltage being compared, exports and controls signal to described energy supply control module accordingly;
Described energy supply control module, for receiving described control signal, and controls the size of described power module adjustment output current according to described control signal.
From foregoing description, beneficial effect of the present invention is: in secondary side feedback power driving circuit, increase signal generator module and output detections module; Realize secondary side feedback power circuit and single-stage can drive multiple identical LED, and often increase and decrease a LED, circuit automatically will detect, judge and control power module and export corresponding electric current; Bring extreme efficiency by single-stage drive circuit, and reduce the holistic cost of power circuit, user can be met again according to demand disassembled and assembled freely LED, be user-friendly to.
Further, described output detections module comprises the output detection circuit and VCC power supply circuits that connect successively;
Described output detection circuit, the current conversion for detecting is detection voltage; And described detection voltage and the detection reference voltage preset are compared, export the control level of a correspondence to described signal generating module;
Described VCC power supply circuits, for providing stable former limit operating voltage, reference voltage and detection reference voltage.
Seen from the above description, by the judgement of output detection circuit to LED load access passage output current, when LED access having been detected, (namely having electric current to export) just sends a level signal, be preferably a low level to signal generating module, select to export the control signal adapted for follow-up constant current constant voltage control module according to the level signal received and basis for estimation is accurately provided.
Further, described signal generator module comprises the light modulation incoming end, analog voltage generation circuit and point voltage follower circuit that connect successively;
Described dimmer incoming end, for receiving the dimmer voltage value of active dimmer or the output of passive dimmer, and exports described analog voltage generation circuit to by described dimmer voltage value;
Described analog voltage produces circuit, for producing corresponding analog voltage signal according to described port number and described dimmer voltage value, and described analog voltage signal is exported to described point voltage follower circuit;
Described point of voltage follower circuit, after receiving described analog voltage, carries out voltage division processing by described analog voltage according to the voltage ratio of correspondence, obtains the analog voltage after processing, and is sent to described constant current constant voltage control module.
Seen from the above description, single-stage multiple-channel output LED power constant-current drive circuit of the present invention is supported in the dimming function within the scope of certain analog voltage simultaneously, realizes carrying out light modulation to a LED load access passage or multichannel, meets consumers' demand.
Further, described analog voltage produces circuit, specifically for limiting adjustable lowest high-current value according to described port number, and within the scope of the adjustable voltage value that described lowest high-current value is corresponding, produces corresponding analog voltage according to described dimmer voltage value; Export described analog voltage to described constant current constant voltage control module.
Seen from the above description, signal generator module of the present invention can limit according to the port number of access LED load the maximum current that power module exports each access passage to, thus realize the LED of each load access passage, light modulation is carried out in the maximal current regions being closed to setting, avoid LED input current excessive and cause LED reduced lifetime, and how little input current is and cause LED lamplight according to not enough.
As shown in Fig. 4,5 and 8, another technical scheme provided by the invention is:
A kind of single-stage multiple-channel output LED power constant-current drive circuit, comprises the LED load access passage of power module, energy supply control module, transformer, former limit control module, pwm signal generation module, output detections module and at least two;
Described power module and energy supply control module are connected with the primary coil of described transformer respectively, and the LED load access passage of described at least two that are arranged in parallel is connected with the secondary coil of described transformer; Described former limit control module respectively with described energy supply control module and described pwm signal generation model calling; Described pwm signal generation module accesses expanding channels by described output detections module and described LED load;
Described output detections module, during for detecting that described in one, LED load access passage has electric current to export, sends a signal to described pwm signal generation module;
Described pwm signal generation module, for the port number of the quantity determination LED access according to the described signal received; And export the pwm signal of corresponding duty ratio according to described port number, and described pwm signal is sent to described former limit control module;
Described former limit control module, controls signal to described energy supply control module accordingly for sending according to described pwm signal;
Described energy supply control module, for receiving described control signal, and controls the size of described power module adjustment output current according to described control signal.
From foregoing description, beneficial effect of the present invention is: in the fed power supplies drive circuit of former limit, increase former limit control module, pwm signal generation module and output detections module; Realize former limit fed power supplies circuit and single-stage can drive multiple identical LED, and often increase and decrease a LED, circuit automatically will detect, judge and control power module and export corresponding electric current; Bring extreme efficiency by single-stage drive circuit, and reduce the holistic cost of power circuit, user can be met again according to demand disassembled and assembled freely LED, be user-friendly to.
Further, described output detections module comprises the output detection circuit and VCC power supply circuits that connect successively;
Described output detection circuit, the current conversion for detecting is detection voltage; And described detection voltage and the detection reference voltage preset are compared, export the control level of a correspondence to described pwm signal generation module;
Described VCC power supply circuits, for providing stable former limit operating voltage, reference voltage and detection reference voltage.
Seen from the above description, by the judgement of output detection circuit to LED load access passage output current, when LED access having been detected, (namely having electric current to export) just sends a level signal, be preferably a low level to pwm signal generation module, provide basis for estimation accurately for rear former limit control module exports according to the pwm signal received the control signal adapted.
Further, described pwm signal generation module comprises the dimmer incoming end, the analog electrical that connect successively
Pressure produces circuit, 0-10V changes pwm circuit and PWM transmission circuit;
Described dimmer incoming end, for receiving the dimmer voltage value of active dimmer or the output of passive dimmer, and exports described analog voltage generation circuit to by described dimmer voltage value;
Described analog voltage produces circuit, for producing corresponding analog voltage according to described port number and described dimmer voltage value, and described analog voltage is exported to described 0-10V conversion pwm circuit;
Described 0-10V changes pwm circuit, exports described PWM transport module to for described analog voltage being converted to corresponding pwm signal;
Described PWM transmission circuit, transfers to described control module for being amplified by the pwm signal of input.
Seen from the above description, on former limit, fed power supplies drive circuit realizes on the basis of single-stage multiple-channel output, also supports the analog voltage dimming function of 0-10V, realizes, to LED load access passage or a multichannel dimming function, better meeting the demand of user.
Further, described analog voltage produces circuit, specifically for limiting adjustable lowest high-current value according to described port number, and within the scope of the adjustable voltage value that described lowest high-current value is corresponding, produces corresponding analog voltage according to described dimmer voltage value; Described analog voltage is exported to described 0-10V and change pwm circuit.
Seen from the above description, in the fed power supplies drive circuit of the former limit of single-stage multiple-channel output of the present invention, described pwm signal generation module can also access the LED string number of LED load access passage according to reality, produce the analog voltage of corresponding output current, and the light modulation supporting in the certain analog voltage range value of the control realization of external dimmer, further, the quantity of the intelligent LED load access passage according to there being electric current to export can also be realized, namely the LED quantity of actual access limits the maximum current that power module exports each passage to, thus make the LED load of each access passage carry out light modulation in the maximal current regions being closed to restriction, the suitable current value that intelligentized control method each LED load access passage exports in ideal range.
Further, described 0-10V conversion pwm circuit comprises three grades of discharge circuits; Described three grades of discharge circuits comprise interconnective sawtooth wave generating circuit and pwm signal generation circuit;
Described sawtooth wave generating circuit is made up of front two stage amplifer, exports pwm signal generation circuit to for the sawtooth waveforms analog voltage of input being converted to corresponding frequencies and amplitude;
Described pwm signal generation circuit is made up of third level amplifier, for receiving dimmer voltage value and described sawtooth waveforms; Relatively dimmer voltage value and sawtooth waveforms, obtain the linear relationship between sawtooth waveforms and the value range of dimmer voltage; Corresponding pwm signal is exported according to described linear relationship.
Seen from the above description, 0-10V changes pwm circuit and is produced by three grades of discharge circuits, front two stage amplifer circuit composition sawtooth wave generating circuit, the sawtooth wave frequency that sawtooth wave generating circuit exports is identical with the PWM frequency of output, and sawtooth wave generating circuit exports pwm signal generation circuit to after producing sawtooth waveforms;
Pwm signal generation circuit exports corresponding pwm signal after treatment according to the dimmer voltage value of dimmer input input, concrete:
When dimmer incoming end access be passive dimmer time, described passive dimmer can be variable resistor; First basic voltage is produced, in dimming process, by basic voltage being dragged down the voltage in rear output certain limit value;
When the access of dimmer incoming end be active dimmer time, preferred described active dimmer is 0-10V dimmer, and described active dimmer exports 0-10V voltage to pwm signal generation circuit; The magnitude of voltage of input and sawtooth waveforms are compared by pwm signal generation circuit, relatively, output pwm signal and input voltage are worth linear relationship, then export corresponding pwm signal according to described linear relationship;
When dimmer incoming end is without external dimmer, pwm signal generation circuit exports the pwm signal of maximum duty cycle.
Further, described former limit control module comprises output current Circuit tuning, output voltage controlling circuit and VCC power supply circuits;
The input of described output current Circuit tuning connects described pwm signal generation module, and output connects the primary coil of described energy supply control module, described VCC power supply circuits and transformer respectively;
The input of described output voltage controlling circuit connects described pwm signal generation module, and output connects described VCC power supply circuits and energy supply control module respectively;
Described VCC power supply circuits are also connected with the primary coil of described transformer and described energy supply control module.
Please refer to Fig. 4,5 and 8, embodiments of the invention one are:
A kind of former limit feedback single-stage multiple-channel output LED power constant-current drive circuit, comprises the LED load access passage of power module, energy supply control module, transformer, former limit control module, pwm signal generation module, output detections module and at least two;
Described output detections module comprises the output detection circuit and VCC power supply circuits that connect successively;
Described pwm signal generation module comprises the dimmer incoming end, analog voltage generation circuit, 0-10V conversion pwm circuit and the PWM transmission circuit that connect successively;
Described former limit control module comprises interconnective output current Circuit tuning and output voltage controlling circuit;
Described power module and energy supply control module are connected with the primary coil of described transformer respectively, and the LED load access passage of described at least two that are arranged in parallel is connected with the secondary coil of described transformer; Described former limit control module respectively with described energy supply control module and described pwm signal generation model calling, concrete, the described output current Circuit tuning of described former limit control module is connected described pwm signal generation module with the input of described output voltage controlling circuit, output connects the primary coil of described energy supply control module and transformer respectively; Described pwm signal generation module accesses expanding channels by described output detections module and described LED load.
As shown in Figure 5, described LED load access passage can mate one drag two LED lamp tube, and drag three LED lamp tube, and the light fixture that drags N number of LED lamp tube, and above-mentioned LED power supply reduces the holistic cost of power supply, meet demand energy-conservation now, reduce the holistic cost of LED lamp simultaneously.
Please refer to Fig. 5 and 8, on the basis of embodiment one, embodiments of the invention two are:
Described output detections module comprises the output detection circuit and VCC power supply circuits that connect successively; Concrete:
Described output detection circuit comprises resistance R46, R63, R71, R45, R47, R36, electric capacity C27, C21, C20, C24, C22 and photoisolator IC7; Concrete operation principle is as follows:
Be connected in series into LED load access channel LED 1+ when there being LED, during LED1-, electric current will be had through R36, generation voltage is given to by R46 the detection reference voltage that the 3rd pin IN+ of photoisolator IC7 amplifier and the 2nd pin set and compares by R36, export a low level more afterwards, tell that pwm signal generation module first LED load access passage has accessed LED.Resistance R63 plays the effect of acceleration detection process; Electric capacity C20, C21 and C27 are used for filtering circuit clutter, prevention circuit erroneous action.
In like manner, second LED load access passage has LED to access LED2+, during LED2-, electric current will be had to cross R47, generation voltage is given to by R45 the detection reference voltage that the 5th pin IN+ of photoisolator IC7 amplifier and the 6th pin set and compares by R47, export a low level more afterwards, tell that pwm signal generation module second LED load access passage has accessed LED.Same, R71 plays the effect of acceleration detection process; Electric capacity C22 and C24 is used for filtering circuit clutter, prevention circuit erroneous action.
Described VCC power supply circuits comprise 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; For providing stable+15VCC operating voltage ,+2.5V reference voltage, also has adjustable detection reference voltage, the benchmark dimmer voltage of passage.
Described pwm signal generation module comprises the dimmer incoming end, analog voltage generation circuit, 0-10V conversion pwm circuit and the PWM transmission circuit that connect successively; Described 0-10V changes pwm circuit and comprises three grades of discharge circuits; Described three grades of discharge circuits comprise interconnective sawtooth wave generating circuit and pwm signal generation circuit concrete:
Described analog voltage produces circuit and comprises 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, and described dimming input circuit is connected with described dimmer incoming end, and described dimmer incoming end can support two kinds of input patterns, and one is passive dimmer, and one is active dimmer;
When after the passive dimmer of access, produced the basic voltage of 10V by R72, ZD5 and C56, by the external passive dimmer of R69 and R68, actual is exactly variable resistor, by R68, basic voltage is dragged down during light modulation, form the 0-10V analog voltage (INPUT-V) of light modulation.
When after the active dimmer of access, the 0-10V voltage that outside 0-10V dimmer exports is by R68, the analog voltage (INPUT-V) forming light modulation; ZD4 plays voltage-limiting protection effect, when outside have input higher than 10V voltage time, ZD4 plays the effect of pressure limiting; C54 plays the light modulation that buffered analog variation in voltage brings and flashes;
The light modulation analog voltage produced, flowing to Q10 through metal-oxide-semiconductor Q8 is in main multichannel analog voltage control circuit;
The level signal that described output detections module exports, drives Q5 by R94; R85 drives Q4; In time having a LED load access passage to access LED, as LED1 passage access LED, output detections module exports the analog voltage generation circuit of low level to described pwm signal generation module of this passage, driven MOS pipe Q5 conducting, the benchmark dimmer voltage Vn of passage after Q5 conducting, deliver in the add circuit of IC10 composition, carry out being added the analog voltage improving Q10 and export, rise to the electric current set to subordinate's module (0-10V changes pwm circuit), drive the LED1 passage of access.In like manner, if detect, second LED load access passage has output current, and namely LED2 passage has accessed LED, is also same operation principle;
The dimmer voltage Vn of benchmark represents the output current of each passage, when an access passage, and the N-VT voltage=VN of 7 pin that IC10 exports, when access two passages time, IC10 exports the N-VT voltage=VN+VN of 7 pin; So ensure that the output current of every multiple access channel power source can multi output electric current at double.Passage, regardless of order, arbitrarily accesses.Formula is: export each channel current of total current=N*;
The N-VT voltage that IC10 exports passes to 0-10V by Q10 and changes pwm circuit.
Above-mentioned analog voltage produces circuit can according to the quantity of the LED string of reality access, produce the analog voltage of corresponding output current, and support the control of external dimmer, thus achieve LED power circuit can export each passage to maximum current according to the LED load access number of channels restriction power module having LED to access, thus make the LED of each passage from being closed to light modulation in limited maximal current regions.
Described 0-10V changes pwm circuit and is produced by three grades of discharge circuits, comprise integrated IC3 (1)-(7) pin, resistance R62, R61, R60, R50, R52, R58, R59, R77, electric capacity C52, C50, C53, C51, C54 and diode D8.Front two stage amplifer composition sawtooth wave generating circuit, resistance R62 and electric capacity C52 discharge and recharge determine sawtooth wave frequency, and this frequency is identical with the pwm signal frequency of output; Resistance R60 and R61 determines the amplitude of sawtooth waveforms, and R50, R52 and C50 provide amplifier reference center electrical voltage point, and in order to energy and 10V voltage compare, the amplitude of sawtooth waveforms must be over 10Vo-p.Front two stage amplifer circuit produces the sawtooth waveforms exported by (1) pin of integrated IC3, is transferred to third level discharge circuit pwm signal generation circuit produces pwm signal by electric capacity C53, resistance R58 and diode D8;
Pwm signal generation circuit comprises (8)-(10) pin of integrated IC3, R59, C54 and R77 form, concrete operation principle is: after the analog voltage receiving the output of described analog voltage generation circuit, analog voltage inputs to third level amplifier "+" through R77 and C54; Sawtooth waveforms passes through C53 filtering dc component simultaneously, the sawtooth waveforms of interchange is passed to input "-" end of third level amplifier; Resistance R58 and diode D8 plays clamper and improves the linear relationship of PWM and the 0-10V that third level amplifier exports more afterwards; Last third level amplifier exports the pwm signal proportional with analog voltage to described PWM transmission circuit by the 8th pin of IC3.
Described PWM transmission circuit comprises resistance R53, R54, R55, R56, R57, R79, R71, photoisolator IC5, triode Q6, Q7 and electric capacity C57; When external-connected port PWM+ inputs pwm signal time, be transferred to triode Q7 and Q6 by R71, R79 and C57 carry out amplifications driving photoisolator IC5 and pass to described former limit control module; As outside DIM+, change pwm circuit output pwm signal by 0-10V and be transferred to Q7 and Q6 through R57, R56 and carry out amplifications driving photoisolator IC5 and pass to former limit control module.
Please refer to Fig. 5 and 8, on the basis of embodiment one, embodiments of the invention three are:
Described pwm signal generation module also comprises keying control module, and described keying control module connects the pwm signal generation circuit of described former limit control module and 0-10V conversion pwm circuit respectively;
Described keying control module resistance R67, R66, R70, R64, R65, R78, R73, R76, R47, R63, photoisolator IC4, electric capacity C55 and triode Q8.R64, R65, R78 and IC4 form benchmark 1.0V; Switching voltage signal gets third level discharge circuit input "+" end, the i.e. IN3+ pin of integrated IC3, compared by this voltage after R67, R66 and R70 and benchmark 1.0V, during lower than 1.0V, tertiary circuit output low level, drives triode Q8 conducting by R76 and R47, the diode current flow of photoisolator IC6 inside is luminous, electric power output voltage is reduced, thus closes output current, LED is closed.R73 plays back stagnant effect, accelerates closing motion and breakdown action, avoids the flicker causing switch to cause.
Described keying control module achieves the opening and closing to LED circuit power supply.
Described former limit control module, described former limit control module comprises output current Circuit tuning, output voltage controlling circuit and VCC power supply circuits;
Output current Circuit tuning comprises resistance R34, R28, R29, R30, R31, electric capacity C17, C18, C19 and photoisolator IC5; LED circuit normal uncomfortable smooth time, PSR IC energy supply control module controls the output current of power module, produce primary current by metal-oxide-semiconductor Q1 and produce a Voltage Feedback to PSRIC energy supply control module through R23, energy supply control module is according to parameters such as the turn ratios of transformer, export corresponding drive waveforms by GATE pin, make LED circuit power supply realize constant current.
Output current Circuit tuning receives the pwm signal produced by described pwm signal generation module, pwm signal isolates amplification output pwm signal through photoisolator IC5, through resistance R30, R31, R29, R28, electric capacity C18, C19 is integrated into the control voltage of an adjustment electric current, described control voltage is higher than normal constant current feedback voltage, and control voltage inputs the current sense pin of PSR IC energy supply control module; After PSR IC energy supply control module receives described control voltage, adjustment GATE pin export maximum take than or the pwm signal of frequency, thus the output current of adjustment power supply, reaches the object of light modulation.
Described output voltage controlling circuit comprises resistance R36, R35, R26 and photoisolator IC6, after keying control module output switching signal, by the triode of photoisolator IC6 isolation drive inside, when LED lamp needs to close, the inner triode of IC6 receives the signal conduction of IC6 light-emitting diode, and former limit VCC exports to the unloaded restrict foot ZCS of PSR IC energy supply control module through resistance R35, R36 and R26 dividing potential drop; And pass through the voltage ratio of adjusting resistance R35 and R36, can obtain just having started luminous lower limit lower than LED, ensure to be operated in no-load standby state by LED circuit power supply no-output electric current;
Otherwise, when the diode cut-off of photoisolator IC6 inside, the triode be attached thereto also ends, former limit VCC voltage be not superimposed upon on resistance R26, by the auxiliary winding output voltage of the certain turn ratio of transformer, the voltage exported brings up to original set point by being exported by the power supply of LED circuit after the voltage ratio of resistance R25, R24 and R26.
VCC power supply circuits form voltage stabilizing circuit by resistance R32 and voltage stabilizing didoe ZD3; Due to LED circuit diminishing along with output current in dimming process, output voltage also diminishes thereupon, the voltage that transformer secondary winding produces also step-down thereupon, and the voltage stabilizing circuit that VCC power supply circuits are formed can be good at ensureing the linear stable in dimming process.
Please refer to Fig. 6,7 and 9, embodiments of the invention four are:
A single-stage multiple-channel output LED power constant-current drive circuit for secondary side feedback, comprises the LED load access passage of power module, energy supply control module, transformer, constant current constant voltage control module, signal generator module, output detections module and at least two;
Described output detections module comprises the output detection circuit and VCC power supply circuits that connect successively;
Described signal generator module comprises the light modulation incoming end, analog voltage generation circuit and point voltage follower circuit that connect successively;
Described power module and energy supply control module are connected with the primary coil of described transformer respectively, and the LED load access passage of described at least two that are arranged in parallel is connected with the secondary coil of described transformer; Described constant current constant voltage control module is connected with the secondary coil of described energy supply control module, described transformer and described signal generator module respectively; Described signal generator module accesses expanding channels by described output detections module and described LED load;
Wherein, described output detections module element composition and operation principle please refer to embodiment two;
The analog voltage that described analog voltage generation module exports is by after R33 and R34 of described point of voltage follower circuit carries out voltage division processing, obtain applicable described constant current constant voltage control module for controlling the analog voltage of energy supply control module, the multichannel realizing secondary side feedback single-stage multiple-channel output LED power constant-current drive circuit exports and dimming function.
As shown in Figures 6 and 7, described LED load access passage can mate one drag two LED lamp tube, and drag three LED lamp tube, and the light fixture that drags N number of LED lamp tube.
In sum, a kind of single-stage multiple-channel output LED power constant-current drive circuit provided by the invention, novelty improvement is carried out respectively for former limit feedback LED power circuit structure and secondary side feedback LED power circuit structure, no matter achieve is former limit feedback or secondary side feedback LED power circuit, the LED quantity that can access passage access according to LED load is carried out self-adaptative adjustment power supply and is exported suitable electric current, supports that single power drives multiplexer channel exports; Meanwhile, single-level circuit is adopted to achieve the linearity light adjusting function of LED power circuit; Further, while guarantee LED circuit can stablize constant current output, can support that again the dim signal of multiple input type carries out the adjustment of electric power outputting current, and open and close LED output current flexibly; Realize the whole efficiency that improve LED circuit power supply, reduce circuit loss, reduce circuit cost, meet the demand of current energy-conserving and environment-protective.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every equivalents utilizing specification of the present invention and accompanying drawing content to do, or be directly or indirectly used in relevant technical field, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. a single-stage multiple-channel output LED power constant-current drive circuit, is characterized in that, comprises the LED load access passage of power module, energy supply control module, transformer, constant current constant voltage control module, signal generator module, output detections module and at least two;
Described power module and energy supply control module are connected with the primary coil of described transformer respectively, and the LED load access passage of described at least two that are arranged in parallel is connected with the secondary coil of described transformer; Described constant current constant voltage control module is connected with the secondary coil of described energy supply control module, described transformer and described signal generator module respectively; Described signal generator module accesses expanding channels by described output detections module and described LED load;
Described output detections module, during for detecting that described in one, LED load access passage has electric current to export, sends a signal to described signal generator module;
Described signal generator module, for the port number of the quantity determination LED access according to the described signal received; And export corresponding analog voltage according to described port number, and described analog voltage is sent to described constant current constant voltage control module;
Described constant current constant voltage control module, after described analog voltage and reference voltage being compared, exports and controls signal to described energy supply control module accordingly;
Described energy supply control module, for receiving described control signal, and controls the size of described power module adjustment output current according to described control signal.
2., according to a kind of single-stage multiple-channel output LED power constant-current drive circuit according to claim 1, it is characterized in that, described output detections module comprises the output detection circuit and VCC power supply circuits that connect successively;
Described output detection circuit, the current conversion for detecting is detection voltage; And described detection voltage and the detection reference voltage preset are compared, export the control level of a correspondence to described signal generating module;
Described VCC power supply circuits, for providing stable former limit operating voltage, reference voltage and detection reference voltage.
3. according to a kind of single-stage multiple-channel output LED power constant-current drive circuit according to claim 1, it is characterized in that, described signal generator module comprises the light modulation incoming end, analog voltage generation circuit and point voltage follower circuit that connect successively;
Described dimmer incoming end, for receiving the dimmer voltage value of active dimmer or the output of passive dimmer, and exports described analog voltage generation circuit to by described dimmer voltage value;
Described analog voltage produces circuit, for producing corresponding analog voltage according to described port number and described dimmer voltage value, and described analog voltage is exported to described point voltage follower circuit;
Described point of voltage follower circuit, after receiving described analog voltage, carries out voltage division processing by described analog voltage according to the voltage ratio of correspondence, obtains the analog voltage after voltage division processing, and be sent to described constant current constant voltage control module.
4. according to a kind of single-stage multiple-channel output LED power constant-current drive circuit according to claim 3, it is characterized in that, described analog voltage produces circuit, specifically for limiting adjustable lowest high-current value according to described port number, and within the scope of the adjustable voltage value that described lowest high-current value is corresponding, produce corresponding analog voltage according to described dimmer voltage value; Export described analog voltage to described constant current constant voltage control module.
5. a single-stage multiple-channel output LED power constant-current drive circuit, is characterized in that, comprises the LED load access passage of power module, energy supply control module, transformer, former limit control module, pwm signal generation module, output detections module and at least two;
Described power module and energy supply control module are connected with the primary coil of described transformer respectively, and the LED load access passage of described at least two that are arranged in parallel is connected with the secondary coil of described transformer; Described former limit control module respectively with described energy supply control module and described pwm signal generation model calling; Described pwm signal generation module accesses expanding channels by described output detections module and described LED load;
Described output detections module, during for detecting that described in one, LED load access passage has electric current to export, sends a signal to described pwm signal generation module;
Described pwm signal generation module, for the port number of the quantity determination LED access according to the described signal received; And export the pwm signal of corresponding duty ratio according to described port number, and described pwm signal is sent to described former limit control module;
Described former limit control module, controls signal to described energy supply control module accordingly for sending according to described pwm signal;
Described energy supply control module, for receiving described control signal, and controls the size of described power module adjustment output current according to described control signal.
6., according to a kind of single-stage multiple-channel output LED power constant-current drive circuit according to claim 5, it is characterized in that, described output detections module comprises the output detection circuit and VCC power supply circuits that connect successively;
Described output detection circuit, the current conversion for detecting is detection voltage; And described detection voltage and the detection reference voltage preset are compared, export the control level of a correspondence to described pwm signal generation module;
Described VCC power supply circuits, for providing stable former limit operating voltage, reference voltage and detection reference voltage.
7. according to a kind of single-stage multiple-channel output LED power constant-current drive circuit according to claim 5, it is characterized in that, described pwm signal generation module comprises the dimmer incoming end, analog voltage generation circuit, 0-10V conversion pwm circuit and the PWM transmission circuit that connect successively;
Described dimmer incoming end, for receiving the dimmer voltage value of active dimmer or the output of passive dimmer, and exports described analog voltage generation circuit to by described dimmer voltage value;
Described analog voltage produces circuit, for producing corresponding analog voltage according to described port number and described dimmer voltage value, and described analog voltage is exported to described 0-10V conversion pwm circuit;
Described 0-10V changes pwm circuit, exports described PWM transport module to for described analog voltage being converted to corresponding pwm signal;
Described PWM transmission circuit, transfers to described control module for being amplified by the pwm signal of input.
8. according to a kind of single-stage multiple-channel output LED power constant-current drive circuit according to claim 7, it is characterized in that, described analog voltage produces circuit, specifically for limiting adjustable lowest high-current value according to described port number, and within the scope of the adjustable voltage value that described lowest high-current value is corresponding, produce corresponding analog voltage according to described dimmer voltage value; Described analog voltage is exported to described 0-10V and change pwm circuit.
9. according to a kind of single-stage multiple-channel output LED power constant-current drive circuit according to claim 5, it is characterized in that, described 0-10V changes pwm circuit and comprises three grades of discharge circuits; Described three grades of discharge circuits comprise interconnective sawtooth wave generating circuit and pwm signal generation circuit;
Described sawtooth wave generating circuit is made up of front two stage amplifer, exports pwm signal generation circuit to for the sawtooth waveforms analog voltage of input being converted to corresponding frequencies and amplitude;
Described pwm signal generation circuit is made up of third level amplifier, for receiving dimmer voltage value and described sawtooth waveforms; Relatively dimmer voltage value and sawtooth waveforms, obtain the linear relationship between sawtooth waveforms and the value range of dimmer voltage; Corresponding pwm signal is exported according to described linear relationship.
10., according to a kind of single-stage multiple-channel output LED power constant-current drive circuit according to claim 5, it is characterized in that, described former limit control module comprises output current Circuit tuning, output voltage controlling circuit and VCC power supply circuits;
The input of described output current Circuit tuning connects described pwm signal generation module, and output connects the primary coil of described energy supply control module, described VCC power supply circuits and transformer respectively;
The input of described output voltage controlling circuit connects described pwm signal generation module, and output connects described VCC power supply circuits and energy supply control module respectively;
Described VCC power supply circuits are also connected with the primary coil of described transformer and described energy supply control module.
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| 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 |
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| CN112351547A (en) * | 2020-12-04 | 2021-02-09 | 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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