CN104902617B - Single-stage power supply LED constant current drives light adjusting circuit - Google Patents
Single-stage power supply LED constant current drives light adjusting circuit Download PDFInfo
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Abstract
The present invention provides a kind of single-stage power supply LED constant current driving light adjusting circuit, improves the efficiency of power circuit, and reduction light modulation cost realizes energy-conservation.The power module and energy supply control module of the present invention connects the primary coil of transformer respectively；Energy supply control module opens and closes control module and PWM transport modules by control module connection；Control module is also connected with the primary coil of transformer；Control module is opened and closed to be connected with PWM transport modules by signal conversion module；Control module is received after the switching signal for opening and closing control module output, sends a control signal to energy supply control module；And receive after the pwm signal of the PWM transport modules output, corresponding dim signal is sent to energy supply control module；The magnitude of voltage of input is converted to corresponding pwm signal and exported to PWM transport modules by signal conversion module；PWM transport modules transmit the pwm signal amplification of input to the control module.
Description
Technical field
Present invention relates particularly to a kind of single-stage power supply LED constant current driving light adjusting circuit.
Background technology
The LED dimming power source circuits of prior art are mainly two kinds of forms：
Such as Fig. 1, constant D/C voltage is changed into using common power.Constant DC voltage is again by buck or boost circuit
Carry out 0-10V analog voltages or pwm control circuit output current is dimmed to LED, open, close；
Such as Fig. 2, using common secondary feedback power supply, adjusting control circuit is added in secondary feedback circuit.Carry out 0-10V
Analog voltage or pwm control circuit output current are dimmed to LED, are opened, and are closed.
Number of patent application also discloses that a kind of constant-current dimming of LED lamp is controlled for 201210337363.5 application documents
Device, including dc source, current order generator, current monitor, comparator and current compensator, pwm control circuit and
Power conversion circuit, mainly by increasing pwm control circuit, by control LED lamp light on and off time ratio and effectively it is bright
The purpose of light modulation is realized in the change of degree.
It can be seen that, traditional LED dimming power sources circuit has following shortcomings:
1st, constant current driving is carried out to LED using two-stage circuit and supports 0-10V analog voltages to dim, circuit complexity cost
It is high.
2nd, two-stage circuit loss ratio is larger, and whole efficiency is than relatively low, temperature rise.Unfavorable product is energy-efficient.
3rd, the dimming power source of common secondary feedback power supply, circuit structure is complicated, and cost is high, and efficiency is less than primary feedback electricity
Source, is unfavorable for cost control and the energy-conservation of product.
The content of the invention
The technical problems to be solved by the invention are：A kind of single-stage power supply LED constant current driving light adjusting circuit is provided, electricity is improved
The efficiency of source circuit, reduction light modulation cost, realizes energy-conservation.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：
A kind of single-stage power supply LED constant current drives light adjusting circuit, including power module, energy supply control module, transformer, control
Module, keying control module, signal conversion module and PWM transport modules；
The power module and energy supply control module connect the primary coil of the transformer respectively；The power supply mould
Block connects the keying control module and PWM transport modules by the control module；The control module also with the transformation
The primary coil connection of device；The keying control module is connected by the signal conversion module with the PWM transport modules；
After the control module, the switching signal for receiving the keying control module output, send a control signal to
Energy supply control module；And receive after the pwm signal of the PWM transport modules output, corresponding dim signal is sent to power supply
Control module；
The energy supply control module, power module output is controlled for receiving after the control signal or the dim signal
The size of electric current；
The signal conversion module, is exported to PWM biographies for the magnitude of voltage of input to be converted into corresponding pwm signal
Defeated module；
The PWM transport modules, for the pwm signal amplification of input to be transmitted to the control module.
The beneficial effects of the present invention are：Present invention difference and the LED constant current driving light adjusting circuit of prior art, are adopted mostly
Realized with two-stage circuit or common secondary feedback mode, circuit is complicated, cost is high, two-stage circuit loss is big, and efficiency is low to ask
Topic.The present invention adds control module in common primary fed power supplies LED circuit, opens and closes control module, signal conversion module
With PWM transport modules；By the cooperation of control module and energy supply control module and transformer, control power supply output same ratio
Electric current, so as to realize the constant current driving of common primary feedback LED power；Passed by control module and signal conversion module and PWM
The cooperation of defeated module, realizes Serial regulation, opens and closes the output current of power module, and then realize opening for linearity light adjusting and LED
Close；Further, LED circuit of the invention is also supported according to a range of analog voltage inputted, or variable resistor, or
Pwm signal realizes the adjustment of output current.The present invention realizes the linearity light adjusting work(of common primary fed power supplies LED circuit
Can, and improve the efficiency of LED circuit power supply, reduction light modulation cost and circuit loss, can preferably energy-conserving and environment-protective, be beneficial to
The intelligentized control method of LED lamp.
Brief description of the drawings
Fig. 1 is the 0-10V light modulation LED power supply circuit diagrams of prior art；
Fig. 2 is in the prior art using 0-10V or the common secondary feedback LED power circuit diagram of pwm signal light modulation；
Fig. 3 is the schematic block circuit diagram that a kind of single-stage power supply LED constant current of one embodiment of the invention drives light adjusting circuit；
Fig. 4 is the circuit diagram that a kind of single-stage power supply LED constant current of one embodiment of the invention drives light adjusting circuit；
Fig. 5 is that the circuit of control module in a kind of single-stage power supply LED constant current driving light adjusting circuit of one embodiment of the invention shows
It is intended to；
Fig. 6 is that the circuit of secondary control in a kind of single-stage power supply LED constant current driving light adjusting circuit of one embodiment of the invention shows
It is intended to.
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:By being arranged on the control module of primary circuit, opening and closing control module, signal
Modular converter and PWM transport modules realize LED constant current driving, light modulation and open and close, improve circuit whole efficiency, reduction circuit into
This, energy-conserving and environment-protective.
Fig. 1 be refer to Fig. 6；
As shown in Figures 3 and 4, a kind of single-stage power supply LED constant current driving light adjusting circuit of present invention offer, including power module,
Energy supply control module, transformer, control module, keying control module, signal conversion module and PWM transport modules；
The power module and energy supply control module connect the primary coil of the transformer respectively；The power supply mould
Block connects the keying control module and PWM transport modules by the control module；The control module also with the transformation
The primary coil connection of device；The keying control module is connected by the signal conversion module with the PWM transport modules；
After the control module, the switching signal for receiving the keying control module output, send a control signal to
Energy supply control module；And receive after the pwm signal of the PWM transport modules output, corresponding dim signal is sent to power supply
Control module；
The energy supply control module, power module output is controlled for receiving after the control signal or the dim signal
The size of electric current；
The signal conversion module, is exported to PWM biographies for the magnitude of voltage of input to be converted into corresponding pwm signal
Defeated module；
The PWM transport modules, for the pwm signal amplification of input to be transmitted to the control module.
From the foregoing, the control module by being arranged on transformer primary side, to the switching signal or pwm signal received
Handled, send corresponding control signal or dim signal to energy supply control module, realize control LED circuit power supply output phase
Electric current in proportion, it is ensured that the brightness of LED lamp output in proportion；Realize the opening and closing to LED circuit power supply.
The present invention just can realize constant current driving and the light modulation to LED circuit using stage circuit, and suitable for common time
Level fed power supplies circuit, simplifies the structure composition of circuit, reduces circuit cost, while reducing circuit loss, improves LED
The whole efficiency of circuit.
Further, in addition to constant pressure feedback module, the constant pressure feedback module connect respectively the energy supply control module,
The primary coil of control module and transformer；
The constant pressure feedback module, for producing Voltage Feedback to the energy supply control module；
The energy supply control module, being additionally operable to receive foundation after the Voltage Feedback includes the parameter of transformer turn ratio
The corresponding drive waveforms of control output.
Seen from the above description, in LED circuit routine work, phase when uncomfortable smooth, power supply mould is controlled by energy supply control module
The output current of block.Specifically, being to produce a Voltage Feedback to energy supply control module by constant pressure feedback module, then pass through electricity
Source control module exports corresponding drive waveforms according to parameters such as the turn ratios of transformer being attached thereto, realizes LED circuit electricity
The constant current output in source.
Further, the control module is powered electricity including output current adjustment circuit, output voltage controlling circuit and VCC
Road；
The input of the output current adjustment circuit connects the PWM transport modules, 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 keying control module, and output end connects described respectively
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.
Further, the dim signal is control voltage；The output current adjustment circuit includes isolation amplifying unit
And integral unit；One end of the isolation amplifying unit connects the PWM transport modules, and the other end is connected by the integral unit
Connect the energy supply control module；
The isolation amplifying unit, for receiving the pwm signal, isolation enhanced processing is carried out to the pwm signal；
The integral unit, for will be integrated into control voltage by isolating the pwm signal of enhanced processing, and occurs to institute
State energy supply control module.
Seen from the above description, output current adjustment circuit realizes the pwm signal according to input to reach the mesh of light modulation
's.Specifically, output current adjustment circuit is after the pwm signal that PWM transport modules are sended over is received, amplify by isolation
The isolation amplification of unit, then pass through the control voltage that integral unit is integrated into a control electric current, the control voltage is higher than LED
Normal constant current feedback voltage, the control voltage is exported to the current sense pin of energy supply control module, passes through electricity in circuit
Source control module adjusts the dutycycle or frequency of the pwm signal of output according to the control voltage, so as to adjust LED circuit power supply
Output current, it is final to realize light modulation purpose.
Further, the output voltage controlling circuit includes isolation drive unit and partial pressure output unit；The isolation
One end of driver element connects the keying control module, and the other end connects the power supply by the partial pressure output unit
Module；
The isolation drive unit, the switching signal for receiving the keying control module output, according to the switch
Semiconductor element on or off inside signal isolation driving；
After the partial pressure output unit, the Continuity signal or cut-off signals for receiving the isolation drive unit output,
Control the VCC voltages of the VCC power supply circuits output to carry out voltage division processing according to corresponding intrinsic standoff ratio, send after voltage division processing
VCC voltages are to the energy supply control module；
The VCC power supply circuits include mu balanced circuit.
Seen from the above description, output voltage controlling circuit is realized reaches LED circuit according to the switching signal received
The keying control function of power supply.Specifically, after the shutdown signal for opening and closing control module output is received in isolation drive unit, will
Turned on by the triode semiconductor element inside photoisolator isolation drive, and the VCC voltages of transformer primary side are through undue
Pressure output unit partial pressure exports the unloaded limitation pin to energy supply control module, realizes the partial pressure by adjusting partial pressure output unit
Than, obtain the luminous lower limit less than LED, it is ensured that LED power circuit is operated in no-load standby state without output current, it is real
The closing of existing LED；
Conversely, after open signal is received, isolation drive unit is by the diode and triode inside isolation drive half
Conductor element ends, and the auxiliary winding output voltage of the certain turn ratio of transformer passes through the certain intrinsic standoff ratio of the partial pressure output unit
After export to energy supply control module, realization brings up to the output current value of LED power original setting value, realizes LED
Open.
Further, the signal conversion module includes three-level discharge circuit；The three-level discharge circuit includes mutually interconnecting
The sawtooth wave generating circuit and pwm signal generation circuit connect；
The sawtooth wave generating circuit is made up of preceding two stage amplifer, for by the magnitude of voltage of input be converted to corresponding frequencies and
The sawtooth waveforms of amplitude 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；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.
Further, the signal conversion module also includes light modulator incoming end；
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 pwm signal generation circuit.
Seen from the above description, signal conversion module is produced by three-level discharge circuit, and preceding two stage amplifer circuit constitutes sawtooth
Wave generation circuit, the frequency of the sawtooth waveforms of sawtooth wave generating circuit output and the PWM frequency identical of output, sawtooth waveforms produce electricity
Road 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 PWM transport modules include amplification driver element；The input difference of the amplification driver element
Connect external-connected port and the signal conversion module；
The amplification driver element, it is right for receiving the pwm signal from external-connected port or signal conversion module output
The pwm signal is amplified processing；The pwm signal after enhanced processing is sent to the control module.
Further, the control module that opens and closes includes the reference voltage circuit of interconnection and compares discharge circuit；
The reference voltage circuit, for producing benchmark voltage；
It is described to compare discharge circuit, for the switching voltage signal of input to be compared with the reference voltage,
If less than the reference voltage value, output shutdown signal to the control module；
If higher than the reference voltage value, output open signal to the control module.
Seen from the above description, opening and closing control module realizes being turned off and on for LED circuit power supply, specifically, by base
Quasi- potential circuit produces reference voltage, and preferred reference voltage is 1.0V；The switching voltage signal of input and reference voltage are done into ratio
Compared with, during less than reference voltage, control output high level driving triode ON, and then turn on the luminous of the connection control module
Diode, electric power output voltage is reduced, so as to close the output current of power supply, realizes the closing of LED；And vice versa.
Further, the control module is controlled by the triode and light emitting diode and described open and close that are sequentially connected respectively
Molding block and the connection of PWM transport modules.
Fig. 4-6 are refer to, embodiments of the invention one are：
A kind of single-stage power supply LED constant current drives light adjusting circuit, including power module, PSR IC energy supply control modules, transformation
Device, control module, keying control module, signal conversion module, PWM transport modules, the LED load of at least one and external light modulation
Device.
One end of the primary coil of power module connection transformer, energy supply control module passes through metal-oxide-semiconductor Q1 connection transformers
Primary coil the other end；The secondary coil connection LED load of transformer；Three poles of control module respectively by being sequentially connected
Pipe and light emitting diode are connected with the keying control module and PWM transport modules；The keying control module is turned by signal
Mold changing block is connected with the PWM transport modules；The signal conversion module and the external passive light modulator of PWM transport modules.
Fig. 4-5 are refer to, on the basis of embodiment one, embodiments of the invention two are：
As shown in figure 5, the control module is powered including output current adjustment circuit, output voltage controlling circuit and VCC
Circuit；
Output current adjustment circuit includes resistance R33, R34, R28, R29, R30, R31, electric capacity C17, C18, C19 and photoelectricity
Isolator IC5；When LED circuit is normal uncomfortable smooth, PSR IC energy supply control modules control the output current of power module, by MOS
Pipe Q1 produces primary current and gives PSR IC energy supply control modules through R23 one Voltage Feedback of generation, and energy supply control module is according to change
The parameters such as the turn ratio of depressor, export corresponding drive waveforms so that LED circuit power supply realizes constant current by GATE pin.
Output current adjustment circuit receives the pwm signal produced by PWM transport modules, and pwm signal is through photoisolator IC5
Isolation amplification output pwm signal, by resistance R30, R31, R29, R28, electric capacity C18, C19 are integrated into the control of an adjustment electric current
Voltage processed, the control voltage is higher than normal constant current feedback voltage, and control voltage inputs the electricity of PSR IC energy supply control modules
Stream detecting pin；PSR IC energy supply control modules are received after the control voltage, and adjustment GATE pin outputs are maximum to take ratio or frequency
The pwm signal of rate, so as to adjust the output current of power supply, reaches the purpose of light modulation.
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. 4 and 6 are refer to, on the basis of embodiment one, embodiments of the invention three are：
The secondary control of LED circuit includes opening and closing control module, signal conversion module and PWM transport modules；Specifically：
The signal conversion module is preferably that 0-10V turns pwm signal module, is produced by three-level discharge circuit, including integrated
IC3 (1)-(7) pin, resistance R62, R61, R60, R50, R52, R58, R59, R77, R68, R69, R72, electric capacity C52, C50, C53,
C51, C54, C56, diode D8, voltage-stabiliser tube ZD4, ZD5.Preceding two stage amplifer constitutes sawtooth wave generating circuit, resistance R62 and electric capacity
C52 discharge and recharges determine the frequency of sawtooth waveforms, and the frequency is identical with the PWM signal frequency exported；Resistance R60 and R61 are determined
The amplitude of sawtooth waveforms, in order to be able to 10V voltage ratios compared with the amplitude of sawtooth waveforms must be over 10Vo-p.Preceding two stage amplifer circuit production
The sawtooth waveforms that raw (1) pin by integrated IC3 is exported, third level amplifier is transferred to by electric capacity C53, resistance R58 and diode D8
Circuit PWM signal generating circuit produces pwm signal；
Pwm signal generation circuit includes integrated IC3 (8)-(10) pin, R59, C54, R77, R69, R72, ZD5, C56 and
R68 is constituted, and specific operation principle is：Pwm signal generation circuit supports the external light modulator of two kinds of input patterns, Yi Zhongshi
Passive light modulator, one kind is active light modulator；
When access passive light modulator after, fundamental voltage by R72, ZD5 and C56 produce 10V basic voltage, by R69,
R77, C54 are linked into integrated IC3 10 pin；Actual passive light modulator is exactly variable resistor, by R68 basic voltage during light modulation
Drag down, integrated IC3 10 pin are inputed to by R77, so as to realize that 0-10V voltage occur in integrated IC3 10 pin.
After active light modulator is accessed, the 0-10V voltages of outside 0-10V light modulators output are connect by R68, R77 and C54
To integrated IC3 10 pin, voltage-regulator diode ZD4 plays voltage-limiting protection effect；When outside has higher than 10V control sources, voltage stabilizing
Diode ZD4 plays a part of pressure limiting；Electric capacity C54 plays the light modulation that buffered analog variation in voltage brings and flashed.
Sawtooth waveforms has filtered out dc component by electric capacity C53, and the sawtooth waveforms and input voltage of exchange are transmitted into subordinate together
The input "-" end of amplifier, i.e., integrated IC3 IN3- pin are compared；Resistance R58 and diode D8 play clamper and improve the third level
PWM and 0-10V linear relationship that amplifier is exported more afterwards.
0-10V importations are made up of R72, ZD5, R69, ZD4, R68, R77 and C54, and R72, ZD5 and R69 provide 10V's
Basic voltage；
When external tapping DIM+ is without external light modulator, "+" end, i.e., integrated IC3 are inputted to third level discharge circuit by R77
IN3+ pin so that pwm signal generation circuit export maximum duty cycle pwm signal.
When the external variable resistors of DIM+, basic voltage 10V is with external variable resistor formation bleeder circuit to discharge circuit
"+" end is inputted, i.e., integrated IC3 IN3+ pin provide 0-10V voltage.
"+" end, i.e., integrated IC3 are inputted to discharge circuit by R77 and R68 when external tapping DIM+ external 0-10V voltages
IN3+ pin transmit 0-10V voltage.
Electric capacity C54 plays a part of to filter out noise and clutter in circuit.
PWM transport modules include resistance R53, R54, R55, R56, R57, R79, R71, photoisolator IC5, triode
Q6, Q7 and electric capacity C57；Triode Q7 is transferred to by R71, R79 and C57 when external-connected port PWM+ inputs pwm signal
Driving photoisolator IC5, which is amplified, with Q6 passes to control module；As outside DIM+, pwm signal mould is turned by 0-10V
Block, i.e. signal conversion module output pwm signal pass through R57, and R56 is transferred to Q7 and Q6 and is amplified driving photoisolator IC5
Pass to control module.
Opening and closing control module includes 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 high 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.
In summary, a kind of single-stage power supply LED constant current driving light adjusting circuit that the present invention is provided, can not only make common first
Level fed power supplies LED circuit realizes linearity light adjusting function；And realized using single-level circuit, ensureing LED circuit energy
While enough stablizing constant current output, and the dim signal of a variety of input types can be supported to carry out the adjustment of electric power outputting current, with
And flexibly open and close LED output currents；Realize and improve the whole efficiency of LED circuit power supply, reduce circuit loss, reduction circuit into
This, 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 (8)
1. a kind of single-stage power supply LED constant current drives light adjusting circuit, it is characterised in that including power module, energy supply control module, change
Depressor, control module, keying control module, signal conversion module and PWM transport modules；
The power module and energy supply control module connect the primary coil of the transformer respectively；The energy supply control module leads to
Cross the control module connection keying control module and PWM transport modules；The control module also with the transformer
Primary coil is connected；The keying control module is connected by the signal conversion module with the PWM transport modules；
After the control module, the switching signal for receiving the keying control module output, power supply is sent a control signal to
Control module；And receive after the pwm signal of the PWM transport modules output, corresponding dim signal is sent to power supply
Module；
The energy supply control module, for controlling power module output current after receiving the control signal or the dim signal
Size；
The signal conversion module, is exported to PWM transmission moulds for the magnitude of voltage of input to be converted into corresponding pwm signal
Block；
The PWM transport modules, for the pwm signal amplification of input to be transmitted to the control module；
Wherein, the 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 transport modules, and output end connects the power supply control respectively
The primary coil of molding block, the VCC power supply circuits and transformer；
The input of the output voltage controlling circuit connects the keying control module, and output end connects the VCC and supplied respectively
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；
Wherein, the output voltage controlling circuit includes isolation drive unit and partial pressure output unit；The isolation drive unit
One end connect the keying control module, the other end passes through the partial pressure output unit and connects the energy supply control module；
The isolation drive unit, the switching signal for receiving the keying control module output, according to the switching signal
Semiconductor element on or off inside isolation drive；
After the partial pressure output unit, the Continuity signal or cut-off signals for receiving the isolation drive unit output, control
The VCC voltages of the VCC power supply circuits output carry out voltage division processing according to corresponding intrinsic standoff ratio, send the VCC after voltage division processing
Voltage is to the energy supply control module；
The VCC power supply circuits include mu balanced circuit.
2. a kind of single-stage power supply LED constant current driving light adjusting circuit according to claim 1, it is characterised in that also including perseverance
Feedback module is pressed, the constant pressure feedback module connects the primary side line of the energy supply control module, control module and transformer respectively
Circle；
The constant pressure feedback module, for producing Voltage Feedback to the energy supply control module；
The energy supply control module, being additionally operable to receive foundation after the Voltage Feedback includes the state modulator of transformer turn ratio
Export corresponding drive waveforms.
3. a kind of single-stage power supply LED constant current driving light adjusting circuit according to claim 1, it is characterised in that the light modulation
Signal is control voltage；The output current adjustment circuit includes isolation amplifying unit and integral unit；The isolation amplification is single
One end of member connects the PWM transport modules, and the other end connects the energy supply control module by the integral unit；
The isolation amplifying unit, for receiving the pwm signal, isolation enhanced processing is carried out to the pwm signal；
The integral unit, for will be integrated into control voltage by isolating the pwm signal of enhanced processing, and occurs to the electricity
Source control module.
4. a kind of single-stage power supply LED constant current driving light adjusting circuit according to claim 1, it is characterised in that the signal
Modular converter includes three-level discharge circuit；The three-level discharge circuit includes the sawtooth wave generating circuit being connected with each other and PWM letters
Number generation circuit；
The sawtooth wave generating circuit is made up of preceding two stage amplifer, for the magnitude of voltage of input to be converted into corresponding frequencies and amplitude
Sawtooth waveforms export 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.
5. a kind of single-stage power supply LED constant current driving light adjusting circuit according to claim 4, it is characterised in that the signal
Modular converter also includes light modulator incoming end；
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 pwm signal generation circuit.
6. a kind of single-stage power supply LED constant current driving light adjusting circuit according to claim 1, it is characterised in that the PWM is passed
Defeated module includes amplification driver element；The input of the amplification driver element connects external-connected port and signal conversion respectively
Module；
The amplification driver element, for receiving the pwm signal from external-connected port or signal conversion module output, to described
Pwm signal is amplified processing；The pwm signal after enhanced processing is sent to the control module.
7. a kind of single-stage power supply LED constant current driving light adjusting circuit according to claim 1, it is characterised in that the keying
Control module includes the reference voltage circuit being connected with each other and compares discharge circuit；
The reference voltage circuit, for producing benchmark voltage；
It is described to compare discharge circuit, for the switching voltage signal of input to be compared with the reference voltage,
If less than the reference voltage value, output shutdown signal to the control module；
If higher than the reference voltage value, output open signal to the control module.
8. a kind of single-stage power supply LED constant current driving light adjusting circuit according to claim 1, it is characterised in that the control
Module is connected by the triode and light emitting diode that are sequentially connected with the keying control module and PWM transport modules respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510190246.4A CN104902617B (en) | 2015-04-21 | 2015-04-21 | Single-stage power supply LED constant current drives light adjusting circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510190246.4A CN104902617B (en) | 2015-04-21 | 2015-04-21 | Single-stage power supply LED constant current drives light adjusting circuit |
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| CN104902617A CN104902617A (en) | 2015-09-09 |
| CN104902617B true CN104902617B (en) | 2017-08-29 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN207665240U (en) * | 2017-11-10 | 2018-07-27 | 深圳市银河风云网络系统股份有限公司 | LED light control device and system |
| CN110032233A (en) * | 2019-04-30 | 2019-07-19 | 深圳市明微电子股份有限公司 | A kind of adaptive constant-flow device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201750592U (en) * | 2010-06-25 | 2011-02-16 | 深圳市欣锐特科技有限公司 | LED driver and LED lamp |
| CN203167353U (en) * | 2013-02-25 | 2013-08-28 | 阳亮 | Single-stage power supply-based LED constant-current driving PWM input light modulation circuit |
| CN103715901A (en) * | 2012-10-05 | 2014-04-09 | Nxp股份有限公司 | Switched-mode power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101523978B (en) * | 2006-11-03 | 2011-04-06 | 奥斯兰姆有限公司 | A circuit for driving light sources and related method |
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2015
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201750592U (en) * | 2010-06-25 | 2011-02-16 | 深圳市欣锐特科技有限公司 | LED driver and LED lamp |
| CN103715901A (en) * | 2012-10-05 | 2014-04-09 | Nxp股份有限公司 | Switched-mode power supply |
| CN203167353U (en) * | 2013-02-25 | 2013-08-28 | 阳亮 | Single-stage power supply-based LED constant-current driving PWM input light modulation circuit |
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