CN103152936B - Single-stage power supply LED (Light Emitting Diode) constant-current driving analog-voltage dimming circuit - Google Patents
Single-stage power supply LED (Light Emitting Diode) constant-current driving analog-voltage dimming circuit Download PDFInfo
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Abstract
The invention provides a single-stage power supply LED (Light Emitting Diode) constant-current driving analog-voltage dimming circuit, which comprises an input power supply module, a power supply control module, an isolation power conversion module, an analog-voltage input current adjusting module, a soft starting module, an output switch control module and a constant-current feedback module. The single-stage power supply LED constant-current driving analog-voltage dimming circuit has the beneficial effects that since the analog-voltage input current adjusting module and the output switch control module are added in a single-stage power supply LED constant-current driving circuit and are matched with the constant-current feedback module and a constant-voltage feedback module, the problems that the efficiency of a two-stage LED driving 0-10V dimming circuit is low, the luminous efficiency of an LED lamp is low and the like can be effectively solved, the energy saving demands at present are complied, the overall cost of the LED lamp is reduced and the intelligentization of the LED lamp is facilitated.
Description
Technical field
The present invention relates to field of LED drive, refer in particular to a kind of single-stage power supply LED constant current and drive analog voltage light adjusting circuit.
Background technology
Existing LED dimming power source circuit is mainly two kinds of forms:
As Fig. 1, alternating current AC changes into constant direct current DC voltage through single-stage power supply.Constant dc DC voltage again carries out 0-10V analog voltage control circuit output current by step-down circuit and carries out light modulation, unlatching, closedown to LED.
As Fig. 2, alternating current AC changes into constant direct current DC voltage through single-stage power supply.Constant dc DC voltage again carries out 0-10V analog voltage control circuit output current by booster type circuit and carries out light modulation, unlatching, closedown to LED.
Visible, traditional LED dimming power source circuit has following shortcoming:
1, the two-stage circuit adopted carries out constant current driving to LED and supports the light modulation of 0-10V analog voltage, and the complicated cost of circuit is high.
2, two-stage circuit loss ratio is comparatively large, and whole efficiency is lower, temperature rise.Unfavorable product is energy-efficient.
Summary of the invention
The object of the invention is to overcome above-mentioned defect, provide a kind of single-stage power supply LED constant current to drive analog voltage light adjusting circuit.
The object of the present invention is achieved like this: a kind of single-stage power supply LED constant current drives analog voltage light adjusting circuit, and it comprises input power module, energy supply control module, isolated power modular converter, analog voltage input current adjusting module, soft-start module, output switch control module and constant current feedback module; Described input power module is provided with ac input end, and input power module is connected with energy supply control module and isolated power modular converter; Described isolated power modular converter be provided with for give each module for power supply power supply output and for constant current voltage output end, isolated power modular converter is connected with energy supply control module, constant current feedback module; Described energy supply control module also connects constant current feedback module and soft-start module; Described analog voltage input current adjusting module is provided with analog voltage signal input, and analog voltage input current adjusting module is connected with constant current feedback module and output switch control module; Described input power module, delivers to isolated power conversion module after carrying out rectifying and wave-filtering after input AC electricity; Described energy supply control module, controls the output of isolated power conversion module for generation of pulse-width signal; Described isolated power conversion module, the constant current voltage for the power supply output and driving LED that the voltage isolated variable of input power module are formed to each module exports; Described analog voltage input current adjusting module, the constant current voltage changing isolated power modular converter for exporting adjustment constant current feedback module and then adjustment energy supply control module according to input analog voltage signal exports, and makes the constant current voltage of isolated power modular converter under the different analog voltage signal of height export the electric current being same ratio; Described soft-start module, is provided for constant current voltage when isolated power modular converter starts and exports slowly rising; Described output switch control module, for comparing the input analog voltage signal of analog voltage input current adjusting module and reference voltage, thus to open or closing control constant current voltage exports; Described constant current feedback module, for exporting according to the constant current voltage of isolated power modular converter and the adjustment signal of analog voltage input current adjusting module, output constant current controls signal to energy supply control module and provides required constant current output by pulse-width modulation and then adjustment isolated power modular converter;
In said structure, described analog voltage input current adjusting module comprises connected driving light modulation output unit and analog signal arithmetic element, wherein drive light modulation output unit to be connected with constant current feedback module, analog signal arithmetic element is provided with analog voltage signal input and is connected with output switch control module;
In said structure, it also comprises constant voltage feedback module, and described constant voltage feedback module is connected with isolated power modular converter, energy supply control module and output switch control module; Described constant voltage feedback module, for exporting according to the constant current voltage of isolated power modular converter and the standby signal of output switch control module, when zero load, output voltage control signal limits its constant current voltage by pulse-width modulation adjustment isolated power modular converter export to controlling energy supply control module; Described output switch control module also controls energy supply control module and exports to minimum for exporting standby signal to constant voltage feedback module when zero load by the constant current voltage of pulse-width modulation adjustment isolated power modular converter;
In said structure, described constant voltage feedback module comprises connected voltage compare driver element and constant voltage sampling unit, and wherein voltage compare driver element is also connected with the power supply output of energy supply control module, isolated power conversion module and output switch control module; Constant voltage sampling unit is connected with the constant current voltage output end of isolated power conversion module;
In said structure, described isolated power modular converter comprises isolated power converting unit and coupled power switch unit, the first auxiliary power unit, output rectification filter unit and the second auxiliary power unit; Described power switch unit is also connected with input power module, energy supply control module; Described first auxiliary power unit is also connected with energy supply control module; Described isolated power converting unit is also connected with energy supply control module; Described output rectification filter unit is also connected with constant voltage feedback module, constant current feedback module and output switch control module; Described second auxiliary power unit is also connected with auxiliary power unit, and auxiliary power unit is connected with constant voltage feedback module and constant current feedback module;
In said structure, it also comprises isolation module and boost voltage output module; Described energy supply control module is by isolation module and constant current feedback module, and constant voltage feedback module and soft-start module are connected; Described isolation module also connects isolated power modular converter; Described isolated power modular converter connects boost voltage output module, and boost voltage output module is provided with 12V DC output end;
In said structure, described output switch control module comprises output open and close unit, control signal comparison operation unit and closes minimizing output voltage unit; Wherein, output switching signal isolation drive unit is provided with switch signal input end, output switching signal isolation drive unit is connected with control signal comparison operation unit, control signal comparison operation unit connection closed reduces output voltage unit and is connected, and closes minimizing output voltage unit and is connected with constant voltage feedback module; Described control signal comparison operation unit is connected with analog voltage input current adjusting module;
In said structure, described energy supply control module comprises power supply PWM control PFC unit and coupled driver element, ZCD zero passage detection unit and feedback unit; Described driver element and ZCD zero passage detection unit are connected with isolated power modular converter respectively; Described feedback unit is connected with constant voltage feedback module, constant current feedback module and soft-start module; Described power supply PWM control PFC unit is also connected with input power module;
In said structure, described input power module comprises the anti-pulse lightning protection unit, EMI unit and the rectification filtering unit that connect successively; Described anti-pulse lightning protection unit is provided with ac input end; Described rectification filtering unit exports and connects energy supply control module and isolated power modular converter;
In said structure, described constant current feedback module comprises connected constant current and compares driver element and constant current sampling unit, and described constant current is compared driver element and is also connected with the power supply output of energy supply control module, isolated power conversion module and analog voltage input current adjusting module; Constant current voltage output end and the output switch control module of described constant current sampling unit and isolated power conversion module are connected; Described soft-start module comprises connected soft start unit and soft start sampling unit, and wherein soft start unit is also connected with energy supply control module, and soft start sampling unit is also connected with the power supply output of isolated power conversion module.
Compared to common LED dimming power source circuit, beneficial effect of the present invention is in single-stage power supply constant current driver circuit for LED, add analog voltage input current adjusting module and output switch control module, coordinate constant current feedback module, constant voltage feedback module, effectively can solve two-stage LED drives 0-10V light adjusting circuit efficiency low, LED lamp light efficiency low lamp problem meets demand energy-conservation now, reduces the holistic cost of LED lamp simultaneously, is beneficial to the intellectuality of LED lamp.
Accompanying drawing explanation
Below in conjunction with accompanying drawing in detail concrete structure of the present invention is described in detail
Fig. 1 is the LED dimming power source circuit diagram of existing employing step-down circuit;
Fig. 2 is the LED dimming power source circuit diagram of existing employing booster type circuit;
Fig. 3 is schematic block circuit diagram of the present invention;
Fig. 4 is the schematic block circuit diagram of specific embodiments of the invention;
Fig. 5 is specific embodiments of the invention circuit diagram;
Fig. 6 is local amplification circuit Fig. 1 of specific embodiment of the invention circuit diagram;
Fig. 7 is local amplification circuit Fig. 2 of specific embodiment of the invention circuit diagram.
1-input power module; 2-energy supply control module; 3-isolated power modular converter; 4-constant current feedback module; 5-soft-start module; 6-output switch control module; 7-analog voltage input current adjusting module; 8-constant voltage feedback module.
Embodiment
By describing technology contents of the present invention, structural feature in detail, realized object and effect, accompanying drawing is coordinated to be explained in detail below in conjunction with execution mode.
See Fig. 3, the invention provides a kind of single-stage power supply LED constant current and drive analog voltage light adjusting circuit,
It comprises input power module 1, energy supply control module 2, isolated power modular converter 3, analog voltage input current adjusting module 7, soft-start module 5, output switch control module 6 and constant current feedback module 4.
Each model calling closes:
Input power module is provided with ac input end, and input power module is connected with energy supply control module and isolated power modular converter; Described isolated power modular converter be provided with for give each module for power supply power supply output and for constant current voltage output end, isolated power modular converter is connected with energy supply control module, constant current feedback module; Described energy supply control module also connects constant current feedback module and soft-start module; Described analog voltage input current adjusting module is provided with analog voltage signal input, and analog voltage input current adjusting module is connected with constant current feedback module and output switch control module.
The function of each module and interaction relationship are:
Input power module, delivers to isolated power conversion module after carrying out rectifying and wave-filtering after input AC electricity;
Energy supply control module, controls the output of isolated power conversion module for generation of pulse-width signal;
Isolated power conversion module, the constant current voltage for the power supply output and driving LED that the voltage isolated variable of input power module are formed to each module exports;
Analog voltage input current adjusting module, the constant current voltage changing isolated power modular converter for exporting adjustment constant current feedback module and then adjustment energy supply control module according to input analog voltage signal exports, and makes the constant current voltage of isolated power modular converter under the different analog voltage signal of height export the electric current being same ratio;
Soft-start module, is provided for constant current voltage when isolated power modular converter starts and exports slowly rising;
Output switch control module, for comparing the input analog voltage signal of analog voltage input current adjusting module and reference voltage, thus to open or closing control constant current voltage exports;
Constant current feedback module, for exporting according to the constant current voltage of isolated power modular converter and the adjustment signal of analog voltage input current adjusting module, output constant current controls signal to energy supply control module and provides required constant current output by pulse-width modulation and then adjustment isolated power modular converter.
The invention provides a kind of embodiment of the further refinement based on circuit module, see Fig. 4, it also comprises constant voltage feedback module, isolation module and boost voltage output module.
Wherein constant voltage feedback module is connected with isolated power modular converter, energy supply control module and output switch control module, be for exporting according to the constant current voltage of isolated power modular converter and the standby signal of output switch control module, when zero load, output voltage control signal limits its constant current voltage by pulse-width modulation adjustment isolated power modular converter export to controlling energy supply control module.Corresponding, above-mentioned output switch control module also controls energy supply control module and exports to minimum for exporting standby signal to constant voltage feedback module when zero load by the constant current voltage of pulse-width modulation adjustment isolated power modular converter.
Best, described constant voltage feedback module comprises connected voltage compare driver element and constant voltage sampling unit, and wherein voltage compare driver element is also connected with the power supply output of energy supply control module, isolated power conversion module and output switch control module; Constant voltage sampling unit is connected with the constant current voltage output end of isolated power conversion module.
And isolation module is for signal isolation, above-mentioned energy supply control module is by isolation module and constant current feedback module, and the voltage compare driver element of constant voltage feedback module and soft-start module are connected.And isolation module also connects isolated power modular converter
Boost voltage output module is then be connected with described isolated power modular converter, and boost voltage output module is provided with 12V DC output end, can be the power supply that circuit other equipment outer carry out 12V direct current.
Further, as an embodiment, input power module comprises the anti-pulse lightning protection unit, EMI unit and the rectification filtering unit that connect successively; Described anti-pulse lightning protection unit is provided with ac input end; Described rectification filtering unit exports and connects energy supply control module and isolated power modular converter.
As an embodiment, energy supply control module comprises power supply PWM control PFC unit and coupled driver element, ZCD zero passage detection unit and feedback unit.Described driver element and ZCD zero passage detection unit are connected with isolated power modular converter respectively; Described feedback unit is connected by the voltage compare driver element of above-mentioned isolation module and constant voltage feedback module, constant current feedback module and soft-start module; Described power supply PWM control PFC unit is also connected with the rectification filtering unit of input power module.
As an embodiment, isolated power modular converter comprises isolated power converting unit and coupled power switch unit, the first auxiliary power unit, output rectification filter unit and the second auxiliary power unit; Described power switch unit is also connected with the rectification filtering unit of input power module, the driver element of energy supply control module; Described first auxiliary power unit is also connected with power supply PWM control PFC unit with the ZCD zero passage detection unit of energy supply control module; Described isolated power converting unit is also connected with the power supply PWM control PFC unit of energy supply control module; Described output rectification filter unit is also connected with the constant voltage sampling unit of constant voltage feedback module, constant current feedback module and output switch control module; Described second auxiliary power unit is also connected with auxiliary power unit, and auxiliary power unit can be connected with the voltage compare driver element of above-mentioned isolation module, constant voltage feedback module, constant current feedback module and analog voltage input current adjusting module.
As an embodiment, analog voltage input current adjusting module comprises the driving light modulation output unit of connected 2.5V-0V and the analog signal arithmetic element of 0-10V, wherein drive light modulation output unit to be connected with constant current feedback module, analog signal arithmetic element is provided with analog voltage signal input and is connected with output switch control module.
As an embodiment, output switch control module comprises output open and close unit, control signal comparison operation unit and closes minimizing output voltage unit; Wherein, output switching signal isolation drive unit is provided with switch signal input end, output switching signal isolation drive unit is connected with control signal comparison operation unit, control signal comparison operation unit connection closed reduces output voltage unit and is connected, and closes minimizing output voltage unit and is connected with constant voltage feedback module; Described control signal comparison operation unit is connected with analog voltage input current adjusting module;
As an embodiment, constant current feedback module comprises connected constant current and compares driver element and constant current sampling unit, and described constant current is compared driver element and is also connected with the power supply output of energy supply control module, isolated power conversion module and analog voltage input current adjusting module; Constant current voltage output end and the output switch control module of described constant current sampling unit and isolated power conversion module are connected; Described soft-start module comprises connected soft start unit and soft start sampling unit, and wherein soft start unit is also connected with energy supply control module, and soft start sampling unit is also connected with the power supply output of isolated power conversion module.
As an embodiment, described soft-start module comprises connected soft start unit and soft start sampling unit, wherein soft start unit is also connected with the feedback unit of energy supply control module by isolation module, and the second auxiliary power unit that soft start sampling unit is also connected with the power supply output of isolated power conversion module is connected.
Be specific embodiment circuit diagram see Fig. 5, wherein constant voltage feedback module 8 is by resistance R31, R33, voltage-stabiliser tube IC2, electric capacity C12, resistance R39, and optocoupler IC5 forms, be used for stable unloaded time output voltage circuit.
Output switch control module 6 is then by triode Q5, Q83, Q84, and resistance R61, R62, R96, R87, R86, R77, R42, R79, R78, diode D9, voltage-stabiliser tube IC8, voltage stabilizing chip IC 6 forms.Wherein, switching signal is by resistance R69, R70, R42, and R77, voltage stabilizing chip IC 6, voltage-stabiliser tube IC8 compares generation, and control signal is by diode D9, and resistance R86, R61, triode Q84, Q83 drive triode Q5 to carry out output open and close.Another road energising resistance R64 drives triode Q6, and the comparison end of triode Q6 output voltage control voltage-stabiliser tube IC2, makes output voltage also be controlled.The computing comparison amplifier that 1 pin of voltage stabilizing chip IC 6,2 pin, 3 pin form, voltage-stabiliser tube IC4, resistance R77 provides benchmark voltage 2.5V, 0-10V input analog voltage signal from analog voltage input current adjusting module becomes 10V-0V voltage signal through operational amplifier IC7 computing and carries out dividing potential drop by resistance R78, R79, the voltage drawn is for comparing with 2.5V reference voltage, finally closed or start signal, go to drive triode Q84, Q83, Q5 to carry out output open and close.The relation controlled is as follows:
1.0-10V input---be less than 0.8V---voltage stabilizing chip IC 6 and export high level-triode Q5 cut-off output closedown.
2.0-10V input---be greater than 0.8V---voltage stabilizing chip IC 6 output low levels-triode Q5 and end output unlatching.
In addition, the closedown minimizing output voltage circuit working process of output switch control module 6 is as follows:
0-10V input---when being less than 0.8V, triode Q83 ends, triode Q6 ends, 12V is by resistance R63, diode D8, compares terminal voltage to voltage stabilizing chip IC 2, and voltage stabilizing chip IC 2 is in degree of depth feedback, make elementaryly to be operated in underloading or interval work state by IC5, output voltage significantly reduces.The closedown that the reduction of output voltage and the cut-off of triode Q5 make LED good, when making to close load, electrochemical capacitor charging voltage is below the normal operating voltage of LED simultaneously.
Prepare for next time starts, so as not to unloaded time electrochemical capacitor be charged to the floating voltage higher than normal load LED impacted.
Without glimmer phenomenon when can realize closing by this output switch control module thus, output voltage when simultaneously coordinating constant voltage feedback module to realize turning off standby lower than LED normal working voltage, protection LED when power initiation from surge more than electrochemical capacitor.Reduce stand-by power consumption simultaneously.
See the local amplification circuit figure that Fig. 6 is constant current feedback module 4, analog voltage input current adjusting module 7 and periphery, analog voltage input current adjusting module coordinates with constant current feedback module, make different 0-10V signals, power supply exports the electric current of same ratio, thus reaches LED lamp output brightness in proportion.Each circuit working principle in current adjustment unit is as follows:
In figure, resistance R37, R46, R48, R50, R47, R34, R35, electric capacity C14, voltage-stabiliser tube IC3 form constant current feedback module 4, voltage-stabiliser tube IC4, electric capacity C14 provides reference voltage 2.5V, resistance R35, R47, R46, R48, R50, voltage-stabiliser tube IC2 forms bleeder circuit, and resistance R37 is constant current sample resistance, resistance R37 samples the voltage of gained, is superimposed upon in bleeder circuit.The reference voltage of voltage-stabiliser tube IC3 is Vf=2.5V, suppose that the inner triode of voltage-stabiliser tube IC2 is that the voltage ratio by adjusting resistance R47, R35 and R46, R48, R50 of conducting can obtain V1, the voltage acted on resistance R37 is V2, V2=Vf-V1, the V2 of gained is exactly constant current sampling voltage, output current Iout=V2/R37.V2+V1 is superimposed upon the comparison end of voltage-stabiliser tube IC3 and internal reference voltage compares, and controls optocoupler IC5 feedback quantity, and optocoupler IC5 adjusts the effect that primary circuit reaches constant current.
In figure, resistance R46, R48, R50, R66, R67, R68, R69, R70, R74, R75, R76, R88, R73, R72, R71, R72, electric capacity C15, C16, diode D10, operational amplifier IC7, voltage stabilizing didoe ZD3, ZD4, potentiometer RP1 etc. form 0-10V analog voltage input current adjusting module 7.Resistance R76, R88, R85, voltage stabilizing didoe ZD3 and external potentiometer CON4 forms the dim signal that bleeder circuit produces 0-10V, also can directly produce 0-10V dim signal by external 0-10V analog voltage signal.First 0-10V dim signal is input to the 5 pin IN+ of operational amplifier IC7 through resistance R88, R75.5,6,7 of operational amplifier IC7 is one group of operational amplifier, and 0-10V analog voltage signal is converted to 10-0V analog voltage, and concrete operation formula is as follows:
Vo: be the OUT2 output voltage of 7 pin of operational amplifier IC7
Vp: be the IN2+ input voltage=virtual voltage=resistance R71, R72, R73 of 6 pin of operational amplifier IC7, voltage stabilizing didoe ZD4 forms dividing potential drop voltage stabilizing circuit=5V
Vi: be the IN2-input voltage=0-10V analog voltage input signal of 50 pin of operational amplifier IC7
Vo=（1+R74/R75）*Vp–(R74/R75)*Vi
In circuit, R74=R75 so:
Vo=2*Vp–Vi
Suppose that the following voltage of input can obtain:
Vi=10V----Vo=0V
Vi=2V-----Vo=8V
Vi=0V-----Vo=10V
The OUT2 output voltage of 7 pin of operational amplifier IC7 carries out dividing potential drop through resistance R69, R70 again, obtains 2.5V-0V analog voltage signal.
This signal carries out voltage follow through the operational amplifier of 1,2, the 3 pin compositions of operational amplifier IC7, increases driving force.Drive singal changes the voltage ratio of resistance R46, R48, R50 thus electric current is adjusted through diode D10, carries out light modulation action.
See the relevant portion circuit diagram that Fig. 7 is soft-start module and periphery, when making power initiation by this soft-start module, output voltage slowly rises, and start-up time can set in start-up circuit.
The voltage that during power initiation, diode D1 exports rises by 0; the voltage signal risen is by resistance R41; electric capacity C11; resistance R49 is coupled to triode Q4 base stage; triode Q4 conducting during startup, to pass to when main primary makes power initiation operating state by interval work progressively to normal operating conditions by optocoupler IC5, thus makes that LED output voltage is ascending progressively rises to normal voltage; complete soft start action, protection LED impacts from voltage surge.Wherein soft-start time is primarily of resistance R41, resistance R49, and electric capacity C11 determines, the effect of electric capacity C49 is played and prevented misoperation.
The invention provides a kind of single-stage power supply LED constant current and drive analog voltage light adjusting circuit, low for current existing two-stage LED constant current PWM light adjusting circuit efficiency, the problem points such as temperature rise is high.The present invention, by carrying out brand-new circuit design to common single-stage power supply secondary feedback circuit, adds 0-10V analog voltage dimming interface.Core technology of the present invention realizes main module and comprises:
1,0-10V analog voltage input current adjusting module
2, soft-start module
3, output switch control module
Coordinate constant current feedback module, constant voltage feedback module, effectively can solve two-stage LED and drive 0-10V light adjusting circuit efficiency low, the low lamp problem of LED lamp light efficiency.This circuit can use by the external common potentiometer of single power supply, also can support that multiple power supply inputs the parallel connection of 0-10V analog voltage simultaneously and uses, facilitate the application of current Intelligent LED lamp.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every utilize specification of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (8)
1. single-stage power supply LED constant current drives an analog voltage light adjusting circuit, it is characterized in that: it comprises input power module, energy supply control module, isolated power modular converter, analog voltage input current adjusting module, soft-start module, output switch control module and constant current feedback module;
Described input power module is provided with ac input end, and input power module is connected with energy supply control module and isolated power modular converter; Described isolated power modular converter be provided with for give each module for power supply power supply output and for constant current voltage output end, isolated power modular converter is connected with energy supply control module, constant current feedback module; Described energy supply control module also connects constant current feedback module and soft-start module; Described analog voltage input current adjusting module is provided with analog voltage signal input, and analog voltage input current adjusting module is connected with constant current feedback module and output switch control module;
Described input power module, delivers to isolated power conversion module after carrying out rectifying and wave-filtering after input AC electricity;
Described energy supply control module, controls the output of isolated power conversion module for generation of pulse-width signal;
Described isolated power conversion module, the constant current voltage for the power supply output and driving LED that the voltage isolated variable of input power module are formed to each module exports;
Described analog voltage input current adjusting module, the constant current voltage changing isolated power modular converter for exporting adjustment constant current feedback module and then adjustment energy supply control module according to input analog voltage signal exports, and makes the constant current voltage of isolated power modular converter under the different analog voltage signal of height export the electric current being same ratio;
Described soft-start module, is provided for constant current voltage when isolated power modular converter starts and exports slowly rising;
Described output switch control module, for comparing the input analog voltage signal of analog voltage input current adjusting module and reference voltage, thus to open or closing control constant current voltage exports;
Described constant current feedback module, for exporting according to the constant current voltage of isolated power modular converter and the adjustment signal of analog voltage input current adjusting module, output constant current controls signal to energy supply control module and provides required constant current output by pulse-width modulation and then adjustment isolated power modular converter;
Also comprise constant voltage feedback module, described constant voltage feedback module is connected with isolated power modular converter, energy supply control module and output switch control module;
Described constant voltage feedback module, for exporting according to the constant current voltage of isolated power modular converter and the standby signal of output switch control module, when zero load, output voltage control signal limits its constant current voltage by pulse-width modulation adjustment isolated power modular converter export to controlling energy supply control module;
Described output switch control module also controls energy supply control module and exports to minimum for exporting standby signal to constant voltage feedback module when zero load by the constant current voltage of pulse-width modulation adjustment isolated power modular converter;
Described output switch control module comprises output open and close unit, control signal comparison operation unit and closes minimizing output voltage unit; Wherein, output switching signal isolation drive unit is provided with switch signal input end, output switching signal isolation drive unit is connected with control signal comparison operation unit, control signal comparison operation unit connection closed reduces output voltage unit and is connected, and closes minimizing output voltage unit and is connected with constant voltage feedback module; Described control signal comparison operation unit is connected with analog voltage input current adjusting module.
2. single-stage power supply LED constant current as claimed in claim 1 drives analog voltage light adjusting circuit, it is characterized in that: described analog voltage input current adjusting module comprises connected driving light modulation output unit and analog signal arithmetic element, wherein drive light modulation output unit to be connected with constant current feedback module, analog signal arithmetic element is provided with analog voltage signal input and is connected with output switch control module.
3. single-stage power supply LED constant current as claimed in claim 1 drives analog voltage light adjusting circuit, it is characterized in that: described constant voltage feedback module comprises connected voltage compare driver element and constant voltage sampling unit, wherein voltage compare driver element is also connected with the power supply output of energy supply control module, isolated power conversion module and output switch control module; Constant voltage sampling unit is connected with the constant current voltage output end of isolated power conversion module.
4. single-stage power supply LED constant current as claimed in claim 1 drives analog voltage light adjusting circuit, it is characterized in that: described isolated power modular converter comprises isolated power converting unit and coupled power switch unit, the first auxiliary power unit, output rectification filter unit and the second auxiliary power unit; Described power switch unit is also connected with input power module, energy supply control module; Described first auxiliary power unit is also connected with energy supply control module; Described isolated power converting unit is also connected with energy supply control module; Described output rectification filter unit is also connected with constant voltage feedback module, constant current feedback module and output switch control module; Described second auxiliary power unit is also connected with auxiliary power unit, and auxiliary power unit is connected with constant voltage feedback module and constant current feedback module.
5. single-stage power supply LED constant current as claimed in claim 1 drives analog voltage light adjusting circuit, it is characterized in that: it also comprises isolation module and boost voltage output module; Described energy supply control module is by isolation module and constant current feedback module, and constant voltage feedback module and soft-start module are connected; Described isolation module also connects isolated power modular converter; Described isolated power modular converter connects boost voltage output module, and boost voltage output module is provided with 12V DC output end.
6. single-stage power supply LED constant current as claimed in claim 1 drives analog voltage light adjusting circuit, it is characterized in that: described energy supply control module comprises power supply PWM control PFC unit and coupled driver element, ZCD zero passage detection unit and feedback unit; Described driver element and ZCD zero passage detection unit are connected with isolated power modular converter respectively; Described feedback unit is connected with constant voltage feedback module, constant current feedback module and soft-start module; Described power supply PWM control PFC unit is also connected with input power module.
7. the single-stage power supply LED constant current as described in claim 1-6 any one drives analog voltage light adjusting circuit, it is characterized in that: described input power module comprises the anti-pulse lightning protection unit, EMI unit and the rectification filtering unit that connect successively; Described anti-pulse lightning protection unit is provided with ac input end; Described rectification filtering unit exports and connects energy supply control module and isolated power modular converter.
8. the single-stage power supply LED constant current as described in claim 1 any one drives analog voltage light adjusting circuit, it is characterized in that: described constant current feedback module comprises connected constant current and compares driver element and constant current sampling unit, described constant current is compared driver element and is also connected with the power supply output of energy supply control module, isolated power conversion module and analog voltage input current adjusting module; Constant current voltage output end and the output switch control module of described constant current sampling unit and isolated power conversion module are connected;
Described soft-start module comprises connected soft start unit and soft start sampling unit, and wherein soft start unit is also connected with energy supply control module, and soft start sampling unit is also connected with the power supply output of isolated power conversion module.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310058174.9A CN103152936B (en) | 2013-02-25 | 2013-02-25 | Single-stage power supply LED (Light Emitting Diode) constant-current driving analog-voltage dimming circuit |
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| CN201310058174.9A CN103152936B (en) | 2013-02-25 | 2013-02-25 | Single-stage power supply LED (Light Emitting Diode) constant-current driving analog-voltage dimming circuit |
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| CN103152936B true CN103152936B (en) | 2015-07-15 |
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| CN103491689B (en) * | 2013-09-27 | 2016-04-20 | 阳亮 | Controllable silicon light modulation LED driving switch power circuit |
| CN105307316B (en) * | 2014-07-31 | 2018-03-13 | 比亚迪股份有限公司 | LED starts control circuit |
| CN105870779A (en) * | 2016-06-21 | 2016-08-17 | 中国工程物理研究院应用电子学研究所 | Laser driving circuit achieved in PWM constant-current mode |
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| CN1745603A (en) * | 2002-12-19 | 2006-03-08 | 皇家飞利浦电子股份有限公司 | LESs driver |
| CN101795517A (en) * | 2010-02-08 | 2010-08-04 | 英飞特电子（杭州）有限公司 | PWM chopping LED driving circuit used for leading edge and/or trailing edge light regulation |
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| JP4669382B2 (en) * | 2005-12-06 | 2011-04-13 | 日本航空電子工業株式会社 | LED drive circuit |
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| CN1745603A (en) * | 2002-12-19 | 2006-03-08 | 皇家飞利浦电子股份有限公司 | LESs driver |
| US20110043133A1 (en) * | 2009-08-19 | 2011-02-24 | Peter Van Laanen | LED-Based Lighting Power Supplies With Power Factor Correction And Dimming Control |
| CN101795517A (en) * | 2010-02-08 | 2010-08-04 | 英飞特电子（杭州）有限公司 | PWM chopping LED driving circuit used for leading edge and/or trailing edge light regulation |
| US20110260645A1 (en) * | 2010-04-26 | 2011-10-27 | Lite-On Technology Corporation | Led backlight driving module |
| CN101984734A (en) * | 2010-11-30 | 2011-03-09 | Bcd半导体制造有限公司 | Control circuit for acceleration start and soft start of LED |
| CN102833916A (en) * | 2012-08-23 | 2012-12-19 | 冠捷显示科技（厦门）有限公司 | DC (direct current) dimming type LED (Light Emitting Diode) drive circuit |
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