CN103260286B - There is drive system and the light adjusting controller of dimming function - Google Patents
There is drive system and the light adjusting controller of dimming function Download PDFInfo
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- CN103260286B CN103260286B CN201210033476.6A CN201210033476A CN103260286B CN 103260286 B CN103260286 B CN 103260286B CN 201210033476 A CN201210033476 A CN 201210033476A CN 103260286 B CN103260286 B CN 103260286B
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Abstract
The invention discloses a kind of drive system with dimming function and light adjusting controller.This drive system includes transformer, luminescence component and light adjusting controller.This transformer has first side winding and the secondary side winding of phase inductance coupling.Between this secondary side winding is held with being coupled to out-put supply line and secondary side.This luminescence component, is held power supply by this out-put supply line and this secondary side.This light adjusting controller is coupled to this secondary side winding, and it, according to the cross-pressure of this secondary side winding, controls to flow through the electric current of this luminescence component.Therefore, the light adjusting controller of the present invention is by suitable external connection, in the case of being not necessarily required to three pins, is i.e. provided that phase truncation, pulse width modulation and the dimming function of simulation three kinds of modes of level.
Description
Technical field
The present invention is about for the light adjusting controller of luminescence component and drive system, espespecially can accept multiple light modulation control
The light adjusting controller of signal processed and drive system.
Background technology
Possess and have the light emitting diode of dimming function (light-emitting diode, LED) drive circuit at least three
Kind possible dimming mode: phase truncation (TRIAC), pulse wave width modulation (pulse-width modulation, PWM), with
And simulation level (analog level).In existing control chip product, the most only possess therein one or two kind of mode.
Fig. 1 shows the LED drive circuit of a kind of prior art, and it has flyback structure (flyback topology).
Transformer therein has first side winding PRM, secondary side winding SEC and the auxiliary winding AUX that phase inductance couples.As schemed
Showing, transformer has been generally isolated primary side circuit and secondary side circuit, the most only by inductance or the AC coupled of electric capacity, point
Not there is different primary side earth connections 22 and secondary side earth connection 24.Power factor improvement (power factor
Correction, PFC) controller 26 makes power switch 34 open a way or short circuit, so that transformer energy storage or release energy.Work as transformer
When releasing energy, secondary side winding SEC passes through commutation diode, sets up output voltage V on out-put supply line VDDLDD。
Multiple light emitting diodes 28 are series between out-put supply line VDDL and the secondary side earth connection 24 of secondary side.Computing
Amplifier 30 can pass through photo-coupler 36, it is provided that determines voltage back mechanism, when light emitting diode 28 is for open circuit, can make operation
Voltage VDDSubstantially less than determining voltage reference voltage VREF-CVA corresponding value.Operational amplifier 32 and current sense electricity
Resistance RS, equally by photo-coupler 36, it is provided that determines current feedback mechanism for one.When light emitting diode 28 is luminous, determines electric current and return
Infeed mechanism flows through the electric current of light emitting diode 28, is approximately equal to determine current reference voltag VREF-CCDivided by current sense resistance RS
The result of resistance value.
But, a kind of phase truncation (TRIAC) light-dimming method, is to set about from primary side.For example, with bleeder circuit, make
Pfc controller 26 detects the input voltage V of input power cord ININ.According to input voltage VINBe about 0V with more than 0V time
Between ratio, control to flow through the electric current of the LED at secondary side.But, it is the highest that the LED current of such method controls precision,
And PWM and simulation level dimming function cannot be provided.
Summary of the invention
Embodiments of the invention provide a kind of drive system with dimming function, it include transformer, luminescence component, with
And light adjusting controller.This transformer has first side winding and the secondary side winding of phase inductance coupling.This secondary side winding coupling
Between holding with being connected to out-put supply line and secondary side.This luminescence component, is held power supply by this out-put supply line and this secondary side.Should
Light adjusting controller is coupled to this secondary side winding, and it, according to the cross-pressure of this secondary side winding, controls to flow through the electricity of this luminescence component
Stream.
Embodiments of the invention provide a kind of light adjusting controller, are formed at IC chip.Light adjusting controller includes phase
Position is blocked control pin, brightness adjustment control pin and processes circuit.This phase truncation controls pin and may be coupled to transformer, uses
To receive sensing signal.This brightness adjustment control pin may be used to receive dim signal.This process circuit, is coupled to this phase truncation control
Between pin processed and this brightness adjustment control pin, in order to provide current settings signal.This process circuit is configured to this dim signal
Priority to this current settings effect of signals, higher than this sensing signal priority to this current settings effect of signals.This electricity
Stream sets signal can affect the electric current flowing through luminescence component.
Accompanying drawing explanation
Fig. 1 shows the LED drive circuit of a kind of prior art.
The secondary side circuit of the Fig. 2 LED drive circuit by being implemented according to the present invention.
Fig. 3 illustrates the internal circuit processed in circuit 41.
Fig. 4 then shows Fig. 1, Fig. 2 and some signal waveforms in Fig. 3.
Fig. 5 shows that the pin of light adjusting controller 40 is connected with the another kind of of external assembly, it is possible to achieve PWM dims.
Fig. 6 shows that the pin of light adjusting controller 40 is connected with the another kind of of external assembly, it is possible to achieve simulation light modulation.Fig. 7
Display light adjusting controller 40aThe connection of pin and external assembly, it is possible to achieve phase truncation dims.Fig. 8, Fig. 9, Figure 10 show
Light adjusting controller 40aThree kinds of pin and external assembly be connected, it is possible to achieve the dimming function of PWM and simulation level.
Wherein, description of reference numerals is as follows:
18 LED power supplies
22 primary side earth connections
24 secondary side earth connections
26 pfc controllers
28 light emitting diodes
30,32 operational amplifier
34 power switch
36 photo-couplers
40,40a light adjusting controller
41 process circuit
42 light modulation detecting phase circuit
44 reference signals provide circuit
46,58,62 resistance
48,64 electric capacity
50,52,56 circuit
60 buffers
ANADIM simulates brightness adjustment control pin
AUX assists winding
D1, D2, OS, OSF end
DRV drive end
IFB current feedback pin
IN input power cord
OUT output connecting pin
PRM first side winding
PWMDIM pulse wave width modulation light modulation pin
PWM/ANADIM pin
RS current sense resistance
SEC secondary side winding
SPWMDIMData signal
TRCDIM phase truncation controls pin
TTRC-OFFDo not power the period
TTRC-ONThe power supply period
VANASimulation dim signal
VD1、VD2Signal
VDD output voltage
VDDL out-put supply line
VDRVDrive signal
VFB voltage back pin
VINInput voltage
VI-SETCurrent settings signal
VOS、VOSFVoltage
VPWMPWM dim signal
VREF-CCDetermine current reference voltag
VREF-CVDetermine voltage reference voltage
VSTABLEStationary value
VTHCritical value
VTOPPreset voltage value
Detailed description of the invention
The secondary side circuit of the Fig. 2 LED drive circuit by being implemented according to the present invention, it is provided that phase truncation
(TRIAC), pulse wave width modulation (pulse-width modulation, PWM) and simulation level (analog level) three
The light modulation of the mode of kind.The primary side circuit not having display in Fig. 2 can be implemented with the primary side circuit in Fig. 1, or uses other
Primary side circuit implement, for industry, there is ordinary skill personage it is known that be not repeated.As shown in Figure 2, secondary side around
Electric current in group SEC is by, after diode rectification, setting up output voltage V on out-put supply line VDDLDD.Out-put supply line VDDL
Together with secondary side earth connection 24, light emitting diode 28 is powered.
Fig. 2 shows light adjusting controller 40.In the examples below, light adjusting controller 40 is the ic core of monocrystalline
Sheet, is formed on the silicon of monocrystalline.According to the light adjusting controller in other example that the present invention is implemented, discrete groups can be used
Form combined by part.
As shown in Figure 2, light adjusting controller 40 has output connecting pin OUT, voltage back pin VFB, current feedback pin
IFB, simulation brightness adjustment control pin ANADIM, pulse wave width modulation light modulation pin PWMDIM and phase truncation control pin
TRCDIM.Operational amplifier 30 in light adjusting controller 40 and operational amplifier 30 and 32 in 32 similar Fig. 1 of connected mode, be one
Plant feedback circuit, it is provided that similar determines voltage and determine current feedback mechanism.Be different from definite value in Fig. 1 determines current reference voltag
VREF-CC, current settings signal V in Fig. 2I-SETIt is by processing circuit 41, according on pin TRCDIM, PWMDIM and ANADIM
Signal is produced and is provided.In one embodiment, current settings signal VI-SETIt is about the voltage signal of simulation, its value maximum
It is 0mV for 350mV, minimum of a value.In another embodiment, current settings signal VI-SETFor the voltage signal of data signal, when
Logical value is " 1 " time, its magnitude of voltage is 350mV, and logical value is " 0 " time, its magnitude of voltage is 0.
In Fig. 2, the pin of light adjusting controller 40 and the connection of external assembly, it is possible to achieve phase truncation dims.With light modulation
Controller 40 realizes other dimming mode, by explained later on.
Process and circuit 41 has light modulation detecting phase circuit 42 and reference signal offer circuit 44.In fig. 2, light modulation phase
Position circuit for detecting 42, by resistance 46, is coupled to secondary side winding SEC.The pin PWMDIM of light adjusting controller 40 is suspension joint, no
It is connected to extraneous assembly.Pin ANADIM is then connected to electric capacity 48.Light modulation detecting phase circuit 42 is according to secondary side winding SEC
Cross-pressure, on pin PWMDIM, produces data signal SPWMDIM.Reference signal provides circuit 44 according to data signal SPWMDIM, come
Current settings signal V is providedI-SET。
Fig. 3 illustrates the internal circuit processed in circuit 41.Fig. 4 then shows Fig. 1, Fig. 2 and some signal waveforms in Fig. 3.
From top to bottom, the driving signal V on the most corresponding drive end DRV in FIG of the waveform in Fig. 4DRV, Fig. 1 center line input IN on
Input voltage VIN, secondary side winding SEC in fig. 2 one end OS on voltage VOS, signal V in Fig. 3 middle-end D1D1, in Fig. 3
Signal V on end D2D2, and Fig. 3 in current settings signal VI-SET。
Pfc controller 26 in Fig. 1 is from drive end DRV, to drive signal VDRVSwitch power switch 34.Such as Fig. 4 institute
Show, input voltage VINMagnitude of voltage change approximately along the sine wave (sinuous wave) after being rectified, but in certain phase place,
Because phase truncation dims, so quickly falling to 0V.
When power switch 34 is unlocked, voltage VOS(equal to the cross-pressure of secondary side winding SEC) can be the anti-of a negative value
Radio pressure, about ratio be the cross-pressure of first side winding PRM at that time, namely input voltage V in Fig. 1IN.When power switch 34 quilt
Close and during transformer discharge, out-put supply line VDDL is charged by secondary side winding SEC, so voltage VOSCan be existed by about strangulation
Output voltage VDD.Therefore, as shown in Figure 4, voltage VOSCan change up and down, and substantially be limited in operation voltage VDDAnd ratio
Example is in input voltage VINNegative voltage between.
Circuit 50 in Fig. 3, by pin TRCDIM, in order to generally to capture in voltage VOS the part for negative value, conversion
Become on the occasion of, carry out a little LPF simultaneously, and produce signal V on end D1D1, as shown in Figure 4.Can also from Fig. 4
Find out, signal VD1Waveform substantially reappeared input voltage VINWaveform.In fig. 2, it is connected to secondary side winding SEC and connects
Resistance 46 resistance value between pin TRCDIM, can be used to determine signal VD1To input voltage VINVoltage ratio.
Since signal VD1It is exactly substantially input voltage VIN, the circuit 52 in Fig. 3 just can substantially judge the phase instantly
The power supply period T defined desired by light modulation is blocked in positionTRC-ONWith the period T that do not powersTRC-OFF.For example, circuit 52 can be
Comparator, comparison signal VD1With critical value VTH, on end D2, produce data signal V according to thisD2, as shown in Figure 4.Work as pin
Data signal S when PWMDIM is suspension joint, on pin PWMDIMPWMDIMAbout equivalent digital signal VD2。
In another embodiment, light modulation detecting phase circuit 42 is according to voltage VOS-Occur that the gap periods of negative voltage is come
Judge the power supply period T defined desired by dimming at phase truncation instantlyTRC-ONWith the period T that do not powersTRC-OFF.Citing
For, by pin TRCDIM, light modulation detecting phase circuit 42 finds voltage VOSExperienced by one section of Preset Time (such as 500ns)
Suitable negative value does not the most occur, the most substantially can be determined that and instantly belong to the period T that do not powersTRC-OFF, dim detecting phase circuit
42 just make data signal VD2For in logic " 0 "；Otherwise, power supply period T is instantly belonged toTRC-ON, light modulation detecting phase circuit 42 is just
Make data signal VD2For in logic " 1 ".The maximum switch periods of this Preset Time, at least primary side power switch 34.Change
Yan Zhi, after power switch 34 experiences a switch periods, voltage VOSSuitable negative value does not the most occur, it is possible to represented at that time
Input voltage VINIt is approximately equal to 0, so instantly should be dimmed, by phase truncation, the period T that do not powersTRC-OFF。
When pin ANADIM external capacitor, as shown in the embodiment of Fig. 2, the reference signal in Fig. 3 provides circuit 44
Equivalent low pass filter, data signal SPWMDIMCarry out LPF, and current settings signal V is providedI-SET.Enforcement at Fig. 3
In example, current settings signal VI-SETStationary value V pursuedSTABLE, about can calculate by below equation I.
VSTABLE=VTOP*TTRC-ON/(TTRC-ON+TTRC-OFF) ……I
Wherein, VTOPIt is shown in Fig. 3, has preset voltage value, be for example 350mV.As shown in Figure 4, current settings letter
Number VI-SETLast big appointment is stable in stationary value VSTABLE。
With explanation, current settings signal V as shown by Fig. 2I-SETBy determining current feedback mechanism, about control stream
Electric current through light emitting diode 28.Current settings signal VI-SETIt is generally corresponding to phase truncation and dims the power supply probably defined
Period TTRC-ONWith the period T that do not powersTRC-OFFFilter result, so light adjusting controller 40 achieve phase truncation light modulation merit
Energy.
Fig. 5 shows that the pin of light adjusting controller 40 is connected with the another kind of of external assembly, it is possible to achieve PWM dims.One
In embodiment, circuit 56 can optionally replace the resistance 46 in Fig. 2, and it can forbid the function that phase truncation dims.Electricity
There is negative voltage low pass filter on road 56, along with input voltage VINChange, can be rough maintain end OSF voltage VOSFFor
Negative value, allow light modulation detecting phase circuit 42 judge is power supply period T always instantlyTRC-ON, so prohibiting phase truncation light modulation.
The PWM dim signal V of extraneous numeralPWMInput from pin PWMDIM.PWM dim signal VPWMLPF result, create
Current settings signal VI-SET, its level, PWM dim signal V can be corresponded approximately toPWMWork period (duty cycle).By Fig. 5
It can be seen that the intervention of resistance 58 so that PWM dim signal VPWMFor current settings signal VI-SETImpact, have precedence over end D2
On data signal VD2For current settings signal VI-SETImpact.
Fig. 6 shows that the pin of light adjusting controller 40 is connected with the another kind of of external assembly, it is possible to achieve simulation light modulation.At this
In embodiment, having resistance 46, pin PWMDIM in the middle of pin TRCDIM and one end OS of secondary side winding SEC is suspension joint, external
Simulation dim signal VANADirectly input from pin ANADIM, as current settings signal VI-SET.As seen from Figure 6, so
If simulation dim signal VANAOccur, current settings signal VI-SETWill be equal to simulate dim signal VANANo matter, pin
Signal on TRCDIM Yu PWMDIM why.Comprehensive speech, for current settings signal VI-SETThe priority arrangement of impact, by
Start at first, be simulation dim signal V respectivelyANA, the signal on PWMDIM and the signal on pin TRCDIM.
According to institute of the present invention embodiment light adjusting controller, it is not necessary to need three pins, provide phase truncation respectively
(TRIAC), PWM and the dimming function of simulation three kinds of modes of level.Fig. 7 illustrates light adjusting controller 40a, it connects with two
Pin (TRCDIM and PWM/ANADIM), provides three kinds of the same dimming functions.
In Fig. 7, light adjusting controller 40aThe connection of pin and external assembly, it is possible to achieve phase truncation dims.With light modulation
Controller 40aRealize the connection of other light modulation, by explained later on.
Light adjusting controller 40aIn the circuit 41 that processes explain in previously other embodiment, be not repeated.Adjust
Optical controller 40aHaving buffer 60, its input is connected to pin PWM/ANADIM, and output can produce current settings signal
VI-SET.In this embodiment, if the input signal of pin PWM/ANADIM, its voltage exceedes certain particular value, then buffer 60
Driving force be 0, current settings signal VI-SETDetermined by process circuit 41 completely.If the input letter of pin PWM/ANADIM
Number, its voltage is in certain particular range, then buffer 60 has sizable driving force, master control current settings signal VI-SET, make
It is little affected by processing circuit 41 is affected.For example, in the embodiment of this specification, if pin PWM/ANADIM
When input voltage is more than 400mV, the driving force of buffer 60 becomes 0；When the input voltage of pin PWM/ANADIM arrives between 0V
During 350mV, current settings signal VI-SETMagnitude of voltage can be approximately equal to the magnitude of voltage on pin PWM/ANADIM.
In the figure 7, the voltage of pin PWM/ANADIM approximates the voltage of power line VDD, more than 400mV, so buffering
The not effect of device 60 equivalent.Therefore, processing circuit 41 will be as previously introduced, by pin TRCDIM and secondary side
Winding detects input voltage VINPhase place, determine power supply period TTRC-ONWith the period T that do not powersTRC-OFF, and impose LPF
Produce current settings signal VI-SET, it is achieved that the function of phase truncation light modulation.
In Fig. 8, light adjusting controller 40aThe connection of pin and external assembly, it is possible to achieve the light modulation of PWM and simulation level
Function.PWM dim signal VPWMOr simulation dim signal VANADirectly pour into pin PWM/ANADIM.As long as PWM is dim signal VPWM
Or simulation dim signal VANAMagnitude of voltage between 0V to 350mV, current settings signal VI-SETReflection PWM light modulation that can be loyal is believed
Number VPWMWith simulation dim signal VANA.When pin PWM/ANADIM reception is simulation dim signal VANATime, simulate dim signal
VANALevel equivalent set the current value flowing through light emitting diode 28, reached simulate level dimming function.Work as pin
The PWM dim signal V of the numeral that PWM/ANADIM receivesPWMTime, although current settings signal VI-SETAlso corresponding number can be presented
Word signal, but power factor improvement (power factor correction, PFC) controller 26 and peripheral circuit institute framework
The PFC power supply unit become, the big appointment of loop frequency range of itself is 10～16Hz, it is possible to PWM dim signal
VPWMResult carry out LPF, flow through the value after the current value of light emitting diode 28 is about stable at a light modulation, reach
The dimming function of PWM.
In Fig. 9, light adjusting controller 40aThe connection of pin and external assembly, it is possible to achieve the light modulation of PWM and simulation level
Function.In Fig. 9, resistance 62 and the electric capacity 64 being connected on pin PWM/ANADIM, it is equal to low pass filter.PWM when numeral
Dim signal VPWMWhen being input to one end of resistance 62, pin PWM/ANADIM there will be corresponding simulation dim signal, reach
Dimming function to the same PWM.One end as resistance 62 receives simulation dim signal VANASituation, then with the feelings in Fig. 8
Shape is similar to, and is not repeated.
In Figure 10, light adjusting controller 40aThe connection of pin and external assembly, it is also possible to realize PWM and simulation level
Dimming function.Just in case the PWM dim signal V that signal source is providedPWMWith simulation dim signal VANAVoltage quasi position exceeded slow
When rushing device 60 acceptable scope, it may be necessary to PWM dim signal VPWMWith simulation dim signal VANAAfter step-down, just carry
Supply pin PWM/ANADIM.Therefore, with two resistance in Figure 10, in order to by PWM dim signal VPWMOr simulation dim signal
VANAStep-down, to provide the corresponding signal with suitable level on pin PWM/ANADIM.
As above example is explained, by suitable external connection, light adjusting controller 40aPhase place can be provided to cut
Disconnected (TRIAC), PWM and the dimming function of simulation three kinds of modes of level.It is similar to, about light adjusting controller 40a, for electricity
Stream sets signal VI-SETThe priority arrangement of impact, by first, be the signal on pin PWM/ANADIM, followed by connect
Signal on pin TRCDIM.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, that is made any repaiies
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (14)
1. there is a drive system for dimming function, including:
Transformer, has first side winding and the secondary side winding of phase inductance coupling, and this secondary side winding is coupled to output electricity
Between source line and secondary side ground end, this out-put supply line is held have positive voltage relative to this secondary side；
Luminescence component, is held power supply by this out-put supply line and this secondary side；And
This drive system is characterised by also including:
Light adjusting controller, is coupled to this secondary side winding, and it is according to the gap periods that cross-pressure is negative voltage of this secondary side winding,
Determine a current settings signal, to control to flow through the electric current of this luminescence component.
2. drive system as claimed in claim 1, it is characterised in that separately include:
Current detector, in order to detect this electric current flowing through this luminescence component, to provide current feedback signal；
This light adjusting controller includes:
Process circuit, be coupled to this secondary side winding, in order to provide this current settings signal；And
Feedback circuit, according to this current feedback signal and this current settings signal, controls this electric current.
3. drive system as claimed in claim 1, it is characterised in that this light adjusting controller includes:
Light modulation detecting phase circuit, by resistance, is coupled to this secondary side winding, according to this cross-pressure of this secondary side winding, produces
Raw data signal；And
Reference signal provides circuit, according to this data signal, it is provided that this current settings signal；
Wherein, this current settings signal is this electric current controlling to flow through this luminescence component.
4. drive system as claimed in claim 3, it is characterised in that this reference signal provides this numeral of circuit LPF letter
Number, to produce this current settings signal.
5. drive system as claimed in claim 1, it is characterised in that this light adjusting controller is integrated circuit, including:
Phase truncation controls pin, by resistance, is coupled to this secondary side winding；
Brightness adjustment control pin, in order to receive dim signal；And
Process circuit, be connected to this phase truncation and control between pin and this brightness adjustment control pin, in order to provide this current settings
Signal；
Wherein, this current settings signal is this electric current controlling to flow through this luminescence component.
6. drive system as claimed in claim 5, it is characterised in that this dim signal is simulation dim signal or pulse wave width
Degree modulation dim signal.
7. drive system as claimed in claim 5, it is characterised in that this dim signal is simulation dim signal, this light modulation control
Device processed separately includes:
Pulse wave width modulation light modulation pin；
Light modulation detecting phase circuit, is coupled to this phase truncation and controls, between pin and this pulse wave width modulation light modulation pin, to depend on
According to this cross-pressure of this secondary side winding, produce data signal；And
Reference signal provides circuit, according to this data signal, it is provided that this current settings signal.
8. drive system as claimed in claim 5, it is characterised in that this external filter capacitor of brightness adjustment control pin.
9. drive system as claimed in claim 1, it is characterised in that this luminescence component is multiple light emitting diode.
10. a light adjusting controller, is formed at IC chip and is applied to a drive system with dimming function, this tune
Optical controller is characterised by including:
Phase truncation controls pin, is coupled to transformer, in order to receive sensing signal；
Brightness adjustment control pin, in order to receive dim signal；And
Process circuit, be coupled to this phase truncation and control between pin and this brightness adjustment control pin, in order to provide current settings to believe
Number, wherein, this process circuit is configured to this dim signal priority to this current settings effect of signals, believes higher than this sensing
Priority number to this current settings effect of signals；
Wherein, this current settings effect of signals flows through the electric current of luminescence component.
11. light adjusting controllers as claimed in claim 10, it is characterised in that this dim signal is simulation dim signal, this tune
Optical controller separately includes:
Pulse wave width modulation light modulation pin；
Light modulation detecting phase circuit, is coupled to this phase truncation and controls, between pin and this pulse wave width modulation light modulation pin, to depend on
According to the cross-pressure of the secondary side winding of the transformer included by this drive system, produce data signal；And
Reference signal provides circuit, according to this data signal, it is provided that this current settings signal.
12. light adjusting controllers as claimed in claim 11, it is characterised in that this current settings signal is to should data signal
Mean value.
13. light adjusting controllers as claimed in claim 10, it is characterised in that separately include:
Current feedback pin, in order to receive current feedback signal, it represents the electric current flowing through luminescence component；And
Feedback circuit, according to this current feedback signal and this current settings signal, controls this electric current.
14. light adjusting controllers as claimed in claim 13, it is characterised in that separately include:
Output connecting pin, is driven by this feedback circuit, is external to photo-coupler.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210033476.6A CN103260286B (en) | 2012-02-15 | 2012-02-15 | There is drive system and the light adjusting controller of dimming function |
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| CN201210033476.6A CN103260286B (en) | 2012-02-15 | 2012-02-15 | There is drive system and the light adjusting controller of dimming function |
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| CN103260286B true CN103260286B (en) | 2016-08-17 |
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|---|---|---|---|---|
| CN101316469A (en) * | 2007-05-28 | 2008-12-03 | 通嘉科技股份有限公司 | Circuit and method for detecting load open loop state |
| CN101489335A (en) * | 2008-01-18 | 2009-07-22 | 尼克森微电子股份有限公司 | LED driving circuit and secondary side controller thereof |
| CN101686587A (en) * | 2008-09-25 | 2010-03-31 | 皇家飞利浦电子股份有限公司 | Drive for providing variable power for LED array |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2011045372A1 (en) * | 2009-10-14 | 2011-04-21 | Tridonic Uk Limited | Phase cut dimming of leds |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101316469A (en) * | 2007-05-28 | 2008-12-03 | 通嘉科技股份有限公司 | Circuit and method for detecting load open loop state |
| CN101489335A (en) * | 2008-01-18 | 2009-07-22 | 尼克森微电子股份有限公司 | LED driving circuit and secondary side controller thereof |
| CN101686587A (en) * | 2008-09-25 | 2010-03-31 | 皇家飞利浦电子股份有限公司 | Drive for providing variable power for LED array |
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