CN105722285B - For the light source driving circuit of TRIAC dimmer - Google Patents
For the light source driving circuit of TRIAC dimmer Download PDFInfo
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- CN105722285B CN105722285B CN201410731506.XA CN201410731506A CN105722285B CN 105722285 B CN105722285 B CN 105722285B CN 201410731506 A CN201410731506 A CN 201410731506A CN 105722285 B CN105722285 B CN 105722285B
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Abstract
The present invention provides a kind of light source driving circuit for TRIAC dimmer, including rectifier, power supply changeover device, light adjusting controller and light source module.Rectifier is used to carry out rectification to the alternating voltage from TRIAC dimmer and generates rectified voltage.Power supply changeover device is coupled with the rectifier, is powered for receiving the rectified voltage and providing output current to light source module.Light adjusting controller is used to control the power supply changeover device according to the rectified voltage, to adjust the output current.Light source module includes the first light source with the first color, the second light source with the second color and the current distribution unit coupled with the first light source and the second light source.Current distribution unit flows through the electric current of the first light source according to output current adjusting and flows through the electric current of the second light source.The light source driving circuit of the present invention can adjust brightness and the color of light source simultaneously by TRIAC dimmer.
Description
Technical field
The present invention relates to a kind of light source driving circuit more particularly to a kind of adjust light source using TRIAC dimmer
Brightness and the light source driving circuit of color.
Background technology
It is well known that light emitting diode (LED) light source compared to conventional incandescent have energy conservation and environmental protection, luminous efficiency it is high,
The advantages that service life is long.Therefore, it is the inexorable trend of current development with LED light source substitution incandescent lamp.LED bulb is LED light
One kind in tool, it has the shape and size similar to conventional incandescent, and bulb includes LED light source and control chip.
Utilize existing light switch, such as traditional ON/OFF light modulator (on/off switch dimmer) or bidirectional triode thyristor tune
Light device (TRIAC dimmer) can only generally control the on or off of LED bulb or control the brightness of light bulb, and can not adjust
Save the color of light.If necessary to adjust the color of light, then need to utilize special switch or remote controler.
Invention content
The present invention provides a kind of light source driving circuit, including rectifier, power supply changeover device, light adjusting controller and light source die
Block.Rectifier is used to carry out rectification to the alternating voltage from TRIAC dimmer and generates rectified voltage.Power supply is converted
Device is coupled with the rectifier, is powered for receiving the rectified voltage and providing output current to light source module.Brightness adjustment control
Device is used to control the power supply changeover device according to the rectified voltage, to adjust the output current.Light source module includes having
The first light source of first color, have the second color second light source and coupled with the first light source and the second light source
Current distribution unit.Current distribution unit flows through the electric current of the first light source according to output current adjusting and flows through institute
State the electric current of second light source.
The present invention also provides a kind of light source driving circuit, including rectifier, power supply changeover device, light adjusting controller and shunting
Access.Rectifier is used to carry out rectification to the alternating voltage from TRIAC dimmer and generates rectified voltage.Power supply turns
Parallel operation is coupled with the rectifier, is powered for receiving the rectified voltage and providing output current to light source module.Light modulation control
Device processed is used to control the power supply changeover device according to the rectified voltage, to adjust the output current.Shunt access is via institute
It states rectifier to couple with the TRIAC dimmer, latching current is provided for the TRIAC dimmer and maintains electricity
Stream.The shunt access includes first resistor, the diode in parallel with the first resistor and the first resistor and described two
Pole pipe series connection capacitance and with the first resistor and the second resistance of the Diode series.
The light source driving circuit that an aspect of of the present present invention provides can adjust light source simultaneously by TRIAC dimmer
Brightness and color.It is double that the light source driving circuit that another aspect of the present invention provides can utilize improved shunt access that will flow through
Higher level is maintained to the electric current of controllable silicon dimmer, is showed so as to avoid the light source scintillation with conventional shunt access
As.
Description of the drawings
Below by way of the description for combining some embodiments of the present invention and its attached drawing, it will be further appreciated that the mesh of the present invention
, specific structural features and advantage.
Fig. 1 show the circuit diagram of light source driving circuit according to an embodiment of the invention；
Fig. 2 show the oscillogram of light source driving circuit shown in Fig. 1；
Fig. 3 show the structure diagram of light source module in Fig. 1；
Fig. 4 show the circuit diagram of light source driving circuit according to an embodiment of the invention；
Fig. 5 show the oscillogram of light source driving circuit shown in Fig. 4；
Fig. 6 show the circuit diagram of light source driving circuit in accordance with another embodiment of the present invention；And
Fig. 7 show the circuit diagram of the light source driving circuit according to another embodiment of the invention.
Specific embodiment
Detailed description will be provided to the embodiment of the present invention below.Although the present invention is explained by these embodiments
It states and illustrates, but should be noted that the present invention is not merely confined to these embodiments.On the contrary, the present invention cover it is rear attached
All substitutes, variant and equivalent defined in claim in spirit and invention scope.
In addition, in order to better illustrate the present invention, numerous details is given in specific embodiment below.
It will be understood by those skilled in the art that without these details, the present invention can equally be implemented.It is right in other example
It is not described in detail in known method, flow, element and circuit, in order to highlight the purport of the present invention.
Fig. 1 show the circuit diagram of light source driving circuit 100 according to an embodiment of the invention.In the example of Fig. 1
In son, light source driving circuit 100 includes the rectifier 108 coupled with TRIAC dimmer 104, light adjusting controller 110, electricity
Source converter 112 and light source module 118.TRIAC dimmer 104 receives the AC-input voltage V that power supply 102 providesIN
And output AC voltage VTRIAC.Rectifier 108 is by the alternating voltage V from TRIAC dimmer 104TRIACCarry out rectification
And generate rectified voltage VREC.Power supply changeover device 112 receives rectified voltage VRECAnd provide output current I for light source module 118OUT,
Light source module 118 to be given to power.Light adjusting controller 110 is according to rectified voltage VRECPower supply changeover device 112 is controlled to adjust output electricity
Flow IOUT, so as to adjust the brightness of light source 118.In one embodiment, light source driving circuit 100 is further included as bidirectional triode thyristor
Light modulator 104 provides latching current (latching current) and maintains the shunt access of electric current (holding current)
114.Shunt access 114 is coupled via rectifier 108 with TRIAC dimmer 104.
TRIAC dimmer 104 includes the triode-thyristor 206 being coupled between power supply 102 and rectifier 108.Three
Holding silicon-controlled 206 has first electrode A1, second electrode A2 and grid G.TRIAC dimmer 104, which further includes, to be connected in series with
Adjustable resistance 208 and capacitance 210 and bidirectional trigger diode 212.212 one end of bidirectional trigger diode and 210 phase of capacitance
Even, the other end is connected with the grid of triode-thyristor 206.Triode-thyristor 206 is a kind of two-way switch, can be double after triggering
To conducting electric current.When having positive voltage or negative voltage is applied to grid G, triode-thyristor 206 can be triggered.Shunt access
114 provide latching current, and after the triggering of triode-thyristor 206 after the triggering of triode-thyristor 206 for triode-thyristor 206
During conducting maintenance electric current is provided for triode-thyristor 206.After triggering, 206 constant conduction of triode-thyristor, until flowing through three ends
Silicon-controlled 206 electric current is reduced under its required maintenance electric current.In other words, after triode-thyristor 206 is triggered, in order to
Triode-thyristor 206 is kept to be connected, flowing through its electric current needs to be greater than or equal to its required maintenance electric current, and otherwise three ends can
Controlling silicon 206 will close.
Fig. 2 show the oscillogram of light source driving circuit 100 shown in Fig. 1.Waveform in Fig. 2 includes AC-input voltage
VIN, voltage V between 206 electrode A 1 of triode-thyristor and A2A2-A1, bidirectional trigger diode 212 electric current IDIAC, it is two-way controllable
The alternating voltage V that silicon light modulator 104 generatesTRIACThe rectified voltage V generated with rectifier 108REC.In the example in figure 2, it exchanges
Input voltage VINIt is sine wave.Fig. 2 will be described with reference to Fig. 1.
Initial time (such as in moment T0To T1Between), triode-thyristor 206 is closed, the voltage between electrode A 1 and A2
VA2-A1With AC-input voltage VINIncrease.In moment T1, the voltage difference at 210 both ends of capacitance causes bidirectional trigger diode 212 to lead
It is logical.The current impulse that the conducting of bidirectional trigger diode 212 generates acts on the grid of triode-thyristor 206 so that three ends are controllable
Silicon 206 is connected, thus by AC-input voltage VINRectifier 108 is transferred to, has electric current to flow through on triode-thyristor 206.It is handing over
Flow input voltage VINFirst half cycle (such as in moment T0To T2Between) will at the end of at the time of T2, because flowing through triode-thyristor 206
Electric current be decreased to maintain electric current under, triode-thyristor 206 is closed.In AC-input voltage VINLater half period (such as when
Carve T2To T4Between), when the voltage difference on capacitance 210 so that bidirectional trigger diode 212 is connected (such as in moment T3), three ends
Silicon-controlled 206 are connected again.By increasing or reducing the resistance value of adjustable resistance 208, the big of 210 charging current of capacitance can be adjusted
It is small, so as to adjust the angle of flow of bidirectional trigger diode 212.Therefore, the resistance value of adjustable resistance 208 finally determines that three ends are controllable
The angle of flow of silicon 206.Rectifier 108 is by alternating voltage VTRIACThe waveform of negative loop be converted to corresponding positive portions waveform
To generate rectified voltage VREC。
Fig. 3 show the structure diagram of light source module 118 in Fig. 1, and Fig. 3 will be described with reference to Fig. 1.Light source module
118 include first light source 121, second light source 122.First light source 121 can be first with the first color (such as cold light)
Light emitting diode chain.Second light source 122 can be the second light emitting diode chain with second of color (such as warm light).Light source die
Block 118 further includes the current distribution unit 120 coupled with first light source 121 and second light source 122, for according to output current
IOUTAdjusting flows through the electric current of first light source 121 and flows through the electric current of second light source 122.It is single that current distribution unit 120 includes monitoring
Member 302, control unit 304 and current adjustment unit 306.In one embodiment, current adjustment unit 306 includes current limiting unit
308.Monitoring unit 302 is coupled with first light source 121 and second light source 122, for providing instruction output current IOUTThe prison of size
Survey signal.Current adjustment unit 306 is coupled with second light source 122.Control unit 304 is adjusted with monitoring unit 302 and electric current
Unit 306 couples, and controls current adjustment unit 306 according to monitoring signals to adjust the electric current for flowing through second light source 122.Current limliting list
Member 308 flows through the maximum current of second light source 122 for limiting.
Fig. 4 show the circuit diagram of light source driving circuit 400 according to an embodiment of the invention.Fig. 5 is shown
The oscillogram of light source driving circuit 400 shown in Fig. 4.Fig. 4 will be described with reference to Fig. 5.The component identical with Fig. 1 labels in Fig. 4
Have the function of similar.Light source driving circuit 400 includes the rectifier 108 coupled with TRIAC dimmer 104, light modulation control
Device 110 processed, power supply changeover device 112, shunt access 114 and light source module 118.
In the example in fig. 4, shunt access 114 includes resistance 408 and diode 406 and and resistance parallel with one another
408 and diode 406 connect capacitance 404 and resistance 407.The anode of diode 406 is coupled with capacitance 404, diode 406
Cathode by resistance 407 with couple.Diode 406 is connected when capacitance 404 charges, and resistance 408 is short-circuited, charging current stream
Through capacitance 404, diode 406 and resistance 407 to ground, the charging current of capacitance 404 is not influenced, therefore two-way by resistance 408
The triggering of controllable silicon dimmer 104 will not be affected.When capacitance 404 discharges, diode 406 is reverse-biased, discharge current from
Ground flows through resistance 407, resistance 408 and capacitance 404.Because being influenced by resistance 408, the discharge current of capacitance 404 reduces.It compares
Conventional shunt access without resistance 408 and diode 406, the shunt access 114 in Fig. 4 include resistance 408 parallel with one another
With diode 406, charging current of the discharge current of capacitance 404 without influencing capacitance 404 can be reduced.When capacitance 404 discharges,
The electric current for flowing into power supply changeover device 112 is the discharge current of capacitance 404 and flows through both electric currents of TRIAC dimmer 104
The sum of, under the premise of load consumed current is certain, the electric current for flowing into power supply changeover device 112 is also certain.Therefore, capacitance 404
Discharge current reduction can cause to flow through the electric current increase of TRIAC dimmer 104.In other words, in the example of Fig. 4 of the present invention
Shunt access 114 electric current for flowing through TRIAC dimmer 104 can be maintained to higher level, flow through it is two-way can
The electric current for controlling silicon light modulator 104 is more than its required maintenance electric current, so as to avoid the scintillation of light source.
In the example in fig. 4, power supply changeover device 112 is to include switch 408, diode 412, capacitance 410 and inductance 414
Voltage boosting-reducing converter.The port of light adjusting controller 110 includes port HV, port COMP, port VDD, port FB, port
GATE, port GND and port CS.Port HV is coupled with rectifier 108, receives instruction rectified voltage VRECSignal VREC’.Signal
VREC' can be with signal VRECIt is proportional.In one embodiment, light adjusting controller 110 includes reference signal generation module (Fig. 4
In be not shown).The V that reference signal generation module is received according to port HVREC' signal generate reference signal REF (do not show in Fig. 4
Go out).The voltage value of reference signal REF can indicate the angle of flow of TRIAC dimmer 104.With reference to figure 2, if user's tune
Section TRIAC dimmer 104 turns it on angle reduction, then VTRIACTurn-on instant T in waveform1In a cycle waveform
It is moved behind position, reference signal REF voltage values reduce.If user adjusts TRIAC dimmer 104 and turns it on angle increase,
The alternating voltage V that then TRIAC dimmer 104 generatesTRIACTurn-on instant T in waveform1Position in a cycle waveform
Forward, the voltage value increase of reference signal REF.It will be understood to those skilled in the art that reference signal generation module can be adopted
With different known realization methods.Such as in one embodiment, reference signal generation module include RC wave filters, for pair
VREC' signal is filtered to generate reference signal REF.In another embodiment, reference signal generation module includes integration
Device, for VREC' signal integrated to generate reference signal REF.In yet another embodiment, reference signal generation module
Including A/D converter and D/A converter, for VREC' signal carries out digital sample and transformation to generate reference signal
REF.Light adjusting controller 110 generates drive signal according to reference signal REF, is controlled out by port GATE output drive signals
408 are closed, is exported so as to adjust power supply changeover device 112 to the output current I of light source module 118OUT.Therefore, when user's adjusting is two-way
During controllable silicon dimmer 104, output current IOUTIt changes correspondingly, the overall brightness of light source module 118 also accordingly changes.
In the example in fig. 4, light source module 118 includes first light source and second light source.First light source can have the
A kind of first light emitting diode chain LED1 of color (such as cold light).Second light source can have second of color (such as warm light)
Second light emitting diode chain LED2.It is single that light source module 118 further includes the electric current distribution coupled with light emitting diode chain LED1, LED2
Member, for according to output current IOUTAdjust the electric current I for flowing through light emitting diode chain LED1LED1With flow through light emitting diode chain
The electric current I of LED2LED2.In the example in fig. 4, current distribution unit includes monitoring unit (such as resistance R44), control unit
(such as transistor Q41) and current adjustment unit (such as including transistor Q42 and resistance R43, wherein resistance R43 is as current limliting
Unit).Resistance R44 is coupled with light emitting diode chain LED1, LED2, for providing instruction output current IOUTMonitoring signals.It is brilliant
Body pipe Q42 is coupled with light emitting diode chain LED2, for adjusting the electric current I for flowing through light emitting diode chain LED2LED2.Transistor
Q41 is coupled with resistance R44 and transistor Q42, for flowing through light-emitting diodes according to monitoring signals controlling transistor Q42 to adjust
The electric current I of pipe chain LED2LED2.If ignoring the electric current for flowing through resistance R43, the electric current I of light emitting diode chain LED1 is flowed throughLED1For
Output current IOUTElectric current I with flowing through light emitting diode chain LED2LED2Difference, therefore adjust flow through light emitting diode chain
The electric current distribution of light emitting diode chain LED1, LED2 can be realized in the electric current of LED2, and light-emitting diodes are flowed through so as to correspondingly adjust
The electric current I of pipe chain LED1LED1.Resistance R43 is coupled with transistor Q42, for limiting the maximum for flowing through light emitting diode chain LED2
Electric current.Specifically, as shown in figure 4, resistance R44 is coupled with light emitting diode chain LED1, LED2, light emitting diode chain is flowed through
The electric current I of LED1LED1With the electric current I for flowing through light emitting diode chain LED2LED2Flow through resistance R44, the voltage at resistance R44 both ends
VR44It is that may indicate that output current IOUTMonitoring signals, voltage VR44Value and output current IOUTSize it is approximately in proportion.Electricity
Resistance R44 is coupled between base stage and the emitter-base bandgap grading of transistor Q41, and the conducting state of transistor Q41 is by voltage VR44It determines.Transistor
The collector of Q42 is coupled with light emitting diode chain LED2, and emitter-base bandgap grading is coupled with resistance R44.In addition, the base stage of transistor Q42 and crystalline substance
The collector of body pipe Q41 is coupled in a common ground, and resistance R43 is coupled in the common ground and light emitting diode chain LED1, LED2
Anode between.
Below by taking the angle of flow that user reduces TRIAC dimmer 104 as an example, light source is driven with reference to Fig. 4 and Fig. 5
Circuit 400 illustrates.In one embodiment, the forward voltage drop of light emitting diode chain LED1 is more than light emitting diode chain LED2
Forward voltage drop, the resistance value of resistance R44 is configured as：When the angle of flow of TRIAC dimmer 104 is maximum value, electricity
Hinder R44 both end voltages VR44More than threshold value VBE_SAT, wherein threshold value VBE_SATIt is and the relevant door of transistor Q41 physical characteristics
Limit value.If the base-emitter voltage V of transistor Q41BEMore than threshold value VBE_SAT, transistor Q41 is located at saturation region.In Fig. 5
Show resistance R44 both end voltages VR44, transistor Q41 base current IQ41_B, transistor Q41 collector current IQ41_C、
The base current I of transistor Q42Q42_B, light emitting diode chain LED1 electric current ILED1With the electric current of light emitting diode chain LED2
ILED2Waveform.
As shown in figure 5, if user adjusts TRIAC dimmer 104, it is gradual since maximum value to turn it on angle
Reduce (such as in moment t0To t1Between), then the electric current for flowing through resistance R44 reduces, voltage VR44T reduces at any time.In voltage VR44
Drop to threshold value VBE_SATBefore, such as in moment t0To t1Between, transistor Q41 is located at saturation region, fully on, so that
The base stage and emitter-base bandgap grading of transistor Q42 is reverse-biased, and transistor Q42 is in cut-off region.In this section of section, the light-emitting diodes of cold light are generated
Pipe chain LED1 is connected, and the light emitting diode chain LED2 for generating warm light is closed, and light source module 118 generates cold light.As voltage VR44Reduce
To threshold value VBE_SAT(such as in moment t1), transistor Q41 initially enters amplification region, with the Base-emitter of transistor Q42
Voltage difference increases, and transistor Q42 also enters amplification region, and light emitting diode chain LED1 and light emitting diode chain LED2 are both turned on, light
Source module 118 generates the mixing output of cold light and warm light.In moment t1To t2Between, with the conducting of TRIAC dimmer 104
Angle reduces, and the electric current of light emitting diode chain LED1 reduces, the electric current increase of light emitting diode chain LED2, and output current IOUT
Reduce, the output of light source module 118 is from cold light gradually to warm light transition.As output current IOUTIt is reduced to and light emitting diode chain
The electric current I of LED2LED2Equal (such as in moment t2), light emitting diode chain LED1 is closed, and light emitting diode chain LED2 is still led
Logical, light source module 118 exports warm light.Until the angle of flow of TRIAC dimmer 104 further reduced, such as at the moment
t3, TRIAC dimmer 104 cannot be successfully triggered so as to close, and light emitting diode chain LED2 is closed.From light-emitting diodes
The electric current I of pipe chain LED1LED1With the electric current I of light emitting diode chain LED2LED2Waveform can be seen that as bidirectional triode thyristor dims
The angle of flow of device 104 reduces, and the brightness of light source module 118 is generally reducing.
In the example of Fig. 4, resistance R43 is used as current limiting unit.As seen from Figure 4, the base current of transistor Q42
IQ42_BIt is proportional to the electric current for flowing through resistance R43.If the resistance value of resistance R43 is larger, the electric current for flowing through resistance R43 is smaller, then
The base current I of transistor Q42Q42_BIt is smaller.According to the characteristic of transistor, the collector current of transistor Q42 (flows through luminous
The electric current I of diode chain LED2LED2) with the base current I of transistor Q42Q42_BThere is following relationship：
ILED2=β * IQ42_B(1)
Wherein, the base stage and collector current amplification coefficient that β is transistor Q42.Therefore, by adjusting the resistance of resistance R43
Value can limit the maximum current of light emitting diode chain LED2.
Fig. 6 show the circuit diagram of light source driving circuit 600 in accordance with another embodiment of the present invention, in Fig. 6 with
The identical component of Fig. 4 labels has the function of similar.Transistor (such as transistor Q41, Q42) in Fig. 4 employs NPN type
Triode is as an example, and the transistor (such as transistor Q61, Q62) in Fig. 6 employs the triode of positive-negative-positive as example.
It will be appreciated by those skilled in the art that its circuit theory is similar with Fig. 4, details are not described herein.
Fig. 7 show the circuit diagram of the light source driving circuit 700 according to another of the invention embodiment, in Fig. 7 with
The identical component of Fig. 4 labels has the function of similar.Light source driving circuit 700 is similar with the light source driving circuit 400 in Fig. 4,
Difference lies in, light source driving circuit 700 is used as monitoring unit using the partial pressure unit 702 in parallel with light emitting diode chain LED1,
For providing instruction output current IOUTMonitoring signals.Partial pressure unit 702 includes the resistance R76 and R72 of series connection, wherein resistance
The voltage at R72 both ends is as monitoring signals.Since when light emitting diode chain LED1 is connected, electric current ILED1With the voltage at its both ends
Exponent function relation, and the voltage at resistance R72 both ends is proportional to the voltage at light emitting diode chain LED1 both ends；On the other hand, such as
Fruit output current IOUTIt is larger, electric current ILED1Also it is larger.Therefore the voltage at resistance R72 both ends can indicate output current IOUTIt is big
It is small.
Fig. 8 show the circuit diagram of the light source driving circuit 800 according to another of the invention embodiment, in Fig. 8 with
The identical component of Fig. 4 labels has the function of similar.Light source driving circuit 800 is similar with the light source driving circuit 400 in Fig. 4,
Difference lies in the example of fig. 8, light source driving circuit 800 employs flyback converter as power supply changeover device 112.Flyback
Converter includes transformer 806, diode 802 and capacitance 804.
As previously mentioned, the present invention provides a kind of light source driving circuits.The light source driving circuit of present disclosure can be with
TRIAC dimmer is used cooperatively, and user can adjust the brightness of light source simultaneously using traditional TRIAC dimmer
And color, without using special light modulator or remote controler.
Embodiment and attached drawing are only the common embodiment of the present invention specifically above.Obviously, claims are not being departed from
Can there are various supplements, modification under the premise of the present invention spirit and invention scope that are defined and replace.Those skilled in the art
It should be understood that the present invention in practical applications can be according to specific environment and job requirement under the premise of without departing substantially from invention criterion
It is varied from form, structure, layout, ratio, material, element, component and other aspects.Therefore, embodiment disclosed here
It is merely to illustrate and unrestricted, the scope of the present invention is defined by appended claims and its legal equivalents, and is not limited to before this
Description.
Claims (11)
1. a kind of light source driving circuit, which is characterized in that the light source driving circuit includes：
Rectifier, for carrying out rectification to the alternating voltage from TRIAC dimmer and generating rectified voltage；
The power supply changeover device coupled with the rectifier, for receiving the rectified voltage and providing output current；
Light adjusting controller, for controlling the power supply changeover device according to the rectified voltage, to adjust the output current；And
The light source module for coupling with the power supply changeover device and being powered by the output current, wherein, the light source module includes：
First light source with the first color；
Second light source with the second color；And
The current distribution unit coupled with the first light source and the second light source flows for being adjusted according to the output current
Electric current through the first light source and the electric current for flowing through the second light source, wherein, the current distribution unit includes：With it is described
First light source and the monitoring unit of second light source coupling, for providing the monitoring signals for indicating the output current；With institute
State the control unit of monitoring unit coupling；And the current adjustment unit coupled with the second light source, wherein the control is single
Member controls the current adjustment unit according to the monitoring signals, to adjust the electric current for flowing through the second light source.
2. light source driving circuit according to claim 1, which is characterized in that
The first light source is the first light emitting diode chain, and the second light source is the second light emitting diode chain, and described first
The forward voltage drop of light emitting diode chain is more than the forward voltage drop of the second light emitting diode chain.
3. light source driving circuit according to claim 1, which is characterized in that the light source driving circuit further includes：
Shunt access, one end coupled via the rectifier with the TRIAC dimmer and the other end with ground coupling
It closes, for providing latching current for the TRIAC dimmer and maintaining electric current, the shunt access includes：
First resistor；
The diode in parallel with the first resistor；
The capacitance being in series with the first resistor in parallel and the diode；And
The second resistance being in series with the first resistor in parallel and the diode.
4. light source driving circuit according to claim 3, which is characterized in that
When the capacitor charging, charging current flows through the diode and the second resistance；When the capacitance discharges, put
Electric current flows through the second resistance and the first resistor.
5. light source driving circuit according to claim 1, which is characterized in that the current adjustment unit further includes：
Current limiting unit, for limiting the maximum current for flowing through the second light source.
6. light source driving circuit according to claim 1, which is characterized in that
The monitoring unit includes the 3rd resistor coupled with the first light source and the second light source, flows through described first
The electric current of light source flows through the 3rd resistor with the electric current for flowing through the second light source, wherein, the monitoring signals include institute
State the voltage at 3rd resistor both ends；
Described control unit includes the first transistor that is coupled with the 3rd resistor, the conducting state of the first transistor by
The voltage at the 3rd resistor both ends is controlled；
The current adjustment unit includes the second transistor coupled with the first transistor, and the second transistor is described
Electric current of the throttling through the second light source is lowered in the control of the first transistor.
7. light source driving circuit according to claim 6, which is characterized in that
If the voltage at the 3rd resistor both ends is more than the first threshold value, the first transistor works in saturation region, institute
It states first light source to light, the second transistor disconnects, and the second light source is closed.
8. light source driving circuit according to claim 1, which is characterized in that
The monitoring unit includes the partial pressure unit in parallel with the first light source, and the partial pressure unit includes the 4th electricity of series connection
Resistance and the 5th resistance, wherein, the monitoring signals include the voltage at the 5th resistance both ends；
Described control unit includes the first transistor that is coupled with the partial pressure unit, the conducting state of the first transistor by
The voltage at the 5th resistance both ends is controlled；
The current adjustment unit includes the second transistor coupled with the first transistor, and the second transistor is described
Electric current of the throttling through the second light source is lowered in the control of the first transistor.
9. light source driving circuit according to claim 8, which is characterized in that
If the voltage at the 5th resistance both ends is more than the first threshold value, the first transistor works in saturation region, institute
It states first light source to light, the second transistor disconnects, and the second light source is closed.
10. a kind of light source driving circuit, which is characterized in that the light source driving circuit includes：
Rectifier, for carrying out rectification to the alternating voltage from TRIAC dimmer and generating rectified voltage；
The power supply changeover device coupled with the rectifier, for receiving the rectified voltage and providing output electricity for light source module
Stream；
Light adjusting controller, for controlling the power supply changeover device according to the rectified voltage, to adjust the output current；And
Shunt access, one end coupled by the rectifier with the TRIAC dimmer and the other end with ground coupling
It closes, for providing latching current for the TRIAC dimmer and maintaining electric current, the shunt access includes：
First resistor；
The diode in parallel with the first resistor；
The capacitance being in series with the first resistor in parallel and the diode；And
The second resistance being in series with the first resistor in parallel and the diode.
11. light source driving circuit according to claim 10, which is characterized in that
When the capacitor charging, charging current flows through the diode and the second resistance；When the capacitance discharges, put
Electric current flows through the second resistance and the first resistor.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203340342U (en) * | 2013-04-04 | 2013-12-11 | Nxp股份有限公司 | Led drive circuit |
| CN103843458A (en) * | 2011-09-12 | 2014-06-04 | 朱诺制造有限公司 | Dimmable LED light fixture having adjustable color temperature |
| CN104025716A (en) * | 2011-11-22 | 2014-09-03 | 克里公司 | Driving circuits for solid-state lighting apparatus with high voltage led components and related methods |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103843458A (en) * | 2011-09-12 | 2014-06-04 | 朱诺制造有限公司 | Dimmable LED light fixture having adjustable color temperature |
| CN104025716A (en) * | 2011-11-22 | 2014-09-03 | 克里公司 | Driving circuits for solid-state lighting apparatus with high voltage led components and related methods |
| CN203340342U (en) * | 2013-04-04 | 2013-12-11 | Nxp股份有限公司 | Led drive circuit |
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