CN105657932B - Light source driving circuit and brightness and color-temperature controller - Google Patents
Light source driving circuit and brightness and color-temperature controller Download PDFInfo
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- CN105657932B CN105657932B CN201410729730.5A CN201410729730A CN105657932B CN 105657932 B CN105657932 B CN 105657932B CN 201410729730 A CN201410729730 A CN 201410729730A CN 105657932 B CN105657932 B CN 105657932B
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Abstract
The invention discloses a kind of light source driving circuit and brightness and color-temperature controller.Light source driving circuit is used to adjusting brightness and the colour temperature of light source, and including electric power converter and is coupled in brightness and the color-temperature controller of electric power converter.Electric power converter is coupling between power supply and light source, for receiving electric energy from power supply and providing the electric energy after adjusting to light source.Brightness and color-temperature controller be used for the conduction detection signal for receiving the conducting state for the triode-thyristor light modulator that instruction is coupled between power supply and electric power converter, and adjusts the brightness of light source based on conduction detection signal.Brightness and color-temperature controller are additionally operable to receive the switch monitors signal of the operation for the ON/that instruction is coupled in triode-thyristor light modulator, and adjust the colour temperature of light source based on switch monitors signal.The present invention is come by the operation to power switch while realizes adjusting to light-source brightness and colour temperature, simple and convenient and save cost without using extra dedicated devices.
Description
Technical field
The present invention relates to light source field, more particularly to a kind of light source driving circuit and brightness and color-temperature controller.
Background technology
In recent years, the new type light source such as light emitting diode (light-emitting diode, LED) on material and manufacture all
Achieve progress.LED has the characteristics that the high efficiency, long-life, bright-colored, can be applied to automobile, computer, communication, military affairs
With the field such as daily necessities.For example LED light can substitute traditional incandescent lamp as lighting source.
Light source can be adjusted in different ways.For example electric power converter receives the alternating current that AC power provides
Pressure, and produce DC voltage and power for LED light source.Controller is according to the light modulation being coupling between AC power and electric power converter
Device adjusts the output of electric power converter, so as to adjust the brightness of LED light source.The light modulator can be triode-thyristor
(TRIAC) light modulator or ON/OFF (ON/OFF) light modulator.However, this light modulator be all only used for adjust light-source brightness and
The colour temperature of light source can not be adjusted.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of light source driving circuit and brightness and color-temperature controller, can
The adjusting to light-source brightness and colour temperature is realized in a manner of simple and convenient.
In order to solve the above technical problems, the present invention provides a kind of light source driving circuit, for adjust light source brightness and
Colour temperature.Light source driving circuit includes：Electric power converter, is coupling between power supply and the light source, for being received from the power supply
Electric energy and to the light source provide adjust after electric energy；And brightness and color-temperature controller, the electric power converter is coupled in,
The conducting inspection of the conducting state for the TRIAC light modulators being coupled in for receiving instruction between the power supply and the electric power converter
Signal is surveyed, and the brightness of the light source is adjusted based on the conduction detection signal, wherein the brightness and color-temperature controller
It is additionally operable to receive the switch monitors signal of the operation for on/off (ON/OFF) switch that instruction is coupled in the TRIAC light modulators, and
And the colour temperature of the light source is adjusted based on the switch monitors signal.
Present invention also offers a kind of brightness and color-temperature controller, the brightness and color-temperature controller include：Signal produces
Device, the proportional monitoring signals of average current for producing to flowing through light source；TRIAC monitors, for receiving instruction coupling
The conduction detection signal of the conducting state of TRIAC light modulators between power supply and electric power converter and according to it is described conducting examine
Signal is surveyed to produce the reference signal of the desired value for the average current for indicating to flow through the light source；Driver, is coupled in the letter
Number generator and the TRIAC monitors, for according to the monitoring signals and the reference signal come produce drive signal with
The electric power converter is controlled to provide the electric energy after adjusting to the light source；And colour temperature control unit, indicate coupling for receiving
Together in the switch monitors signal of the ON/OFF of the TRIAC light modulators operations switched, and it is based on the switch monitors signal
Adjust the colour temperature of the light source.
Compared with prior art, light source driving circuit of the invention and brightness and color-temperature controller can be by opening power supply
The operation for closing (e.g., including ON/OFF is switched and TRIAC light modulators) to realize the adjusting to light-source brightness and colour temperature, nothing at the same time
It need to use extra dedicated devices, it is simple and convenient and save cost.
Brief description of the drawings
Below by way of the description that some embodiments of the present invention are combined with its attached drawing, it will be further appreciated that the mesh of the present invention
, specific structural features and advantage.
Figure 1A show the block diagram of light source driving circuit according to embodiments of the present invention；
Figure 1B show the light source driving circuit comprising ON/OFF switches and TRIAC light modulators according to embodiments of the present invention
Block diagram；
Fig. 1 C show the generation of TRIAC light modulators or received signal oscillogram in Figure 1B；
Fig. 2 show the schematic diagram of one embodiment of the power switch in Figure 1A and Figure 1B；
Fig. 3 show the circuit diagram of light source driving circuit according to embodiments of the present invention；
Fig. 4 show the brightness in Fig. 3 and the structure diagram of color-temperature controller；
Fig. 5 show the structure diagram of the TRIAC monitors in Fig. 4；
Fig. 6 show the structure diagram of the color temperature control module in Fig. 4；
Fig. 7 show the light source driving circuit comprising the color temperature control module shown in Fig. 6 according to embodiments of the present invention
Signal waveforms；
Fig. 8 show the light source driving electricity of the color temperature control module according to another embodiment of the present invention comprising shown in Fig. 6
The signal waveforms on road；And
Fig. 9 show control light-source brightness according to embodiments of the present invention and the method flow diagram of colour temperature.
Embodiment
Detailed reference will be provided to the embodiment of the present invention below.Although the present invention is explained by these embodiments
State and illustrate, but should be noted that the present invention is not merely confined to these embodiments.On the contrary, the present invention cover it is appended
All substitutes, variation 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 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, formality, element and circuit, in order to highlight the purport of the present invention.
Figure 1A show the block diagram of light source driving circuit 100 according to embodiments of the present invention.In one embodiment, light
Source includes the first light-emitting component (for example, the first LED chains 120) and the second light-emitting component (for example, the 2nd LED chains 130).Second
LED chains 130 can have the color temperature value different from the first LED chains 120, for example, the first LED chains 120 have the first color temperature value, and
2nd LED chains 130 have the second color temperature value.It is coupling in power supply VINPower switch 101 between light source driving circuit 100 includes
ON/OFF switchs 102 (for example, rocker switch) and TRIAC light modulators 104, by power supply VINIt is selectively coupled to light source driving electricity
Road 100.It is worth noting that, although ON/OFF switches 102 are coupling in before TRIAC light modulators 104 in figure ia, this is simultaneously
It is nonrestrictive.For example, as shown in figure 3, ON/OFF switches 102 can be coupling in after TRIAC light modulators 104.In an implementation
In example, power switch 101 can be placed in the power switch on metope.As shown in Fig. 2, the power switch 101 divides for the first half
The TRIAC light modulators 104 and the ON/OFF switches 102 of the latter half divided.In operation, by the way that ON/OFF switches 102 are switched
To ON ends or OFF ends, the conduction state of power switch 101 for closure or can be disconnected by user's control, and by ON/OFF
The operation (for example, opening operation) of switch 102 adjusts the colour temperature of light source.Meanwhile user can also be by TRIAC light modulators
104 operation (for example, knob-operated) adjusts the brightness of light source.
AC-input voltage V from power supplyIN102 and TRIAC light modulators 104, which are switched, via ON/OFF is converted into alternating current
Press VTRIAC.Light source driving circuit 100 includes being used for alternating voltage VTRIACIt is converted into rectified voltage VRECRectifier 106, coupling
Close electric power converter 108 between rectifier 106 and light source (for example, the first LED chains 120 and the 2nd LED chains 130), brightness
With color-temperature controller 112, the first controlling switch 122 and the second controlling switch 132.Electric power converter 108 is used for from rectifier 106
Receive rectified voltage VRECAnd the output electricity after adjusting is provided to light source (for example, the first LED chains 120 and the 2nd LED chains 130)
Flow IOUT.Electric power converter 108 includes the transformer 110 with primary side winding and vice-side winding.
Brightness and color-temperature controller 112 are coupling in the primary side winding of transformer 110 with light source (for example, the first LED chains 120
And the 2nd LED chain 130) between, the switch monitors of the operation (for example, opening operation) for receiving instruction ON/OFF switches 102
Signal TS, and the colour temperature of light source (for example, the first LED chains 120 and the 2nd LED chains 130) is adjusted based on switch monitors signal TS.
As shown in Figure 1A, brightness and color-temperature controller 112 produce the controls of first control signal CTR1 and second according to switch monitors signal TS
Signal CTR2 processed controls the first LED chains 120 and the 2nd LED chains 130 respectively.
First control signal CTR1 selectively switch on be coupling in brightness and 112 and the first LED chains 120 of color-temperature controller it
Between the first controlling switch 122 so that the colour temperature of light source is adjusted to the first color temperature value.Second control signal CTR2 is optionally
The second controlling switch 132 being coupling between 112 and the 2nd LED chains 130 of brightness and color-temperature controller is connected, so that the color of light source
Temperature is adjusted to the second color temperature value.More specifically, if first control signal CTR1, which is connected, is coupling in brightness and colour temperature control
The first controlling switch 122 between 112 and the first LED chains 120 of device, then electric current ILED1Flow through the first LED chains 120 and light source
Colour temperature is adjusted to the first color temperature value；If second control signal CTR2, which is connected, is coupling in brightness and color-temperature controller 112 and the
The second controlling switch 132 between two LED chains 130, then electric current ILED2The colour temperature for flowing through the 2nd LED chains 130 and light source is adjusted
Whole is the second color temperature value.
In addition, brightness and color-temperature controller 112 be additionally operable to receive instruction TRIAC light modulators 104 conducting state (for example,
Angle of flow between 0-180 degree) conduction detection signal TD, and the brightness of light source is adjusted based on conduction detection signal TD
(for example, electric current ILED1Or electric current ILED2Value).Specifically, the operation of the adjustment brightness can be understood with reference to Figure 1B and Fig. 1 C, is schemed
1B show the light source driving circuit 100 that 102 and TRIAC light modulators 104 are switched comprising ON/OFF according to embodiments of the present invention
Block diagram.As shown in Figure 1B, TRIAC light modulators 104 include being coupling between ON/OFF switches 102 and rectifier 106
TRIAC devices 202.TRIAC devices 202 have port A1, port A2 and grid G.TRIAC light modulators 104 further include series connection coupling
The variable resistor 204 and capacitance 206 of conjunction, and two ends exchange (Diode for Alternating Current, DIAC) device
208.One end of DIAC devices 208 is coupled to capacitance 206, and the other end is coupled to the grid G of TRIAC devices 202.TRIAC devices
202 be two-way switch, can be in either direction conducting electric current once being triggered.TRIAC devices 202 can be by applying to grid G just
Electric current or negative current triggering.Once being triggered, TRIAC devices 202 will drop to threshold in the electric current for flowing through port A1 and port A2
Value is (for example, keep electric current IH) be held on before.
Fig. 1 C show TRIAC light modulators 104 in Figure 1B according to an embodiment of the invention and generate or received signal
Oscillogram.Fig. 1 C will be described with reference to Figure 1B.Fig. 1 C show AC-input voltage VIN, TRIAC devices 202 port A1 and
Voltage V between the A2 of portA2-A1, flow through the electric current I of DIAC devices 208DIAC, alternating voltage VTRIACWith rectified voltage VRECWaveform.
In the example of Fig. 1 C, AC-input voltage VINWith sine waveform.In moment T0To moment T1Between, TRIAC
Device 202 turns off, the voltage V between port A1 and port A2A2-A1With AC-input voltage VINIncrease and increase.In moment T1
To moment T2Between, TRIAC devices 202 are held on.So in moment T1To moment T2Between, alternating voltage VTRIACWaveform and friendship
Flow input voltage VINWaveform it is consistent.
Close to AC-input voltage VINThe first half period T at the time of terminate2, due to flowing through the electricity of TRIAC devices 202
The holding electric current for being brought down below TRIAC devices 202 is flowed down, TRIAC devices 202 turn off.In AC-input voltage VINThe second half
In cycle, when the voltage on capacitance 206 is in moment T3When turning on DIAC devices 208, TRIAC devices 202 turn on again.Similarly,
In moment T3To moment T4Between, alternating voltage VTRIACWaveform and AC-input voltage VINWaveform it is consistent.
In one embodiment, user can adjust the resistance value R of variable resistor 204204, for example, rotation TRIAC light modulators 104
Knob adjust the resistance value R of variable resistor 204204.The resistance value R of variable resistor 204204Determine that TRIAC devices 202 are defeated in exchange
Enter voltage VINEach half period in turn-on instant.More specifically, in one embodiment, if the resistance value of variable resistor
R204Increase, in moment T0The average value of the charging current to charge afterwards for capacitance 206 reduces.Therefore, the voltage on capacitance 206 needs
More times are wanted to reach and 208 relevant voltage threshold of DIAC devices.So the turn-on instant of TRIAC devices 202 is prolonged
Late, for example, being later than moment T1.Similarly, if the resistance value R of variable resistor204Reduce, the turn-on instant of TRIAC devices 202 is carried
It is early, for example, earlier than moment T1.Therefore, by adjusting the resistance value R of variable resistor 204204, TRIAC devices 202 in each half period
Turn-on instant adjusted accordingly, for example, turn-on instant is delayed or early by.TRIAC light modulators 104 can have other knots
Structure, and it is not limited to the embodiment of Figure 1B and Fig. 1 C.In another embodiment, if the resistance value R of variable resistor 204204Become
Change, for example, resistance value R204Be adjusted by a user, in each half period the shut-off moment of TRIAC devices 202 be adjusted.To illustrate
Bright, in the following description, TRIAC light modulators 104 adjust the turn-on instant of TRIAC devices 202.However, not office of the invention
It is limited to this, TRIAC light modulators 104 of the invention apply also for the shut-off moment of adjustment TRIAC devices 202.
Figure 1A and Figure 1B are returned to, brightness and color-temperature controller 112 receive the conducting state (example of instruction TRIAC devices 202
Such as, the angle of flow between 0-180 degree) conduction detection signal TD, and light source is adjusted based on conduction detection signal TD
Brightness is (for example, electric current ILED1Or electric current ILED2Value).Brightness and color-temperature controller 112 produce drive according to conduction detection signal TD
Dynamic signal DRV.Controlling switch (for example, controlling switch Q3 in Fig. 3) in drive signal DRV control electric power converters 108 is handed over
For first state (for example, conducting state) and the second state (for example, off state) is worked in, LED light source is flowed through so as to adjust
Average current (for example, electric current ILED1Or electric current ILED2).More specifically, in one embodiment, brightness and color-temperature controller
112 detect the turn-on instant of TRIAC devices 202 in each cycle based on conduction detection signal TD.If variable resistor 204
Resistance value R204Increase (for example, knob by rotating TRIAC light modulators 104), in each cycle during the conducting of TRIAC devices 202
Carve delay.Thus, brightness and 112 controlling switch Q3 of color-temperature controller flow through LED light source (for example, the first LED chains 120 to reduce
Or the 2nd LED chain 130) average current.Similarly, if the resistance value R of variable resistor 204204Reduce, brightness and color-temperature controller
112 controlling switch Q3 flow through the average current of LED light source (for example, the first LED chains 120 or the 2nd LED chains 130) to improve.Example
Such as, if as described above, if brightness and color-temperature controller 112 produce first control signal according to switch monitors signal TS
CTR1 connects the first controlling switch 122 and the colour temperature of light source is adjusted to the first color temperature value, then brightness and color-temperature controller
112 flow through the average current I of the first LED light source 120 according to the operation of TRIAC light modulators 104 to adjustLED1.If brightness and
Color-temperature controller 112 according to switch monitors signal TS produce second control signal CTR2 come connect the second controlling switch 132 and
The colour temperature of light source is adjusted to the second color temperature value, then brightness and color-temperature controller 112 according to the operation of TRIAC light modulators 104 come
The average current I of the second LED light source 130 is flowed through in adjustmentLED2。
Advantageously, brightness and color-temperature controller 112 not only can adjust light source according to the operation of ON/OFF switches 102
The colour temperature of (for example, the first LED chains 120 and the 2nd LED chains 130), can also at the same time according to the operation of TRIAC light modulators 104 come
The brightness of LED light source (for example, the first LED chains 120 and the 2nd LED chains 130) is adjusted, without using extra dedicated devices,
It is simple and convenient and save cost.Brightness and the operation of color-temperature controller 112 will be described further with reference to Fig. 3.
Fig. 3 show the circuit diagram of light source driving circuit 300 according to embodiments of the present invention.In figure 3, it is succinct
For the sake of, power supply V is not shownINWith TRIAC light modulators 104.Light source driving circuit 300 is by power supply VIN(for example, 110/120V is exchanged,
60Hz) 102 and TRIAC light modulators 104 are switched via ON/OFF to power.Alternating voltage VTRIACVia wave filter 302 and rectifier
106 (for example, the bridge rectifiers being made of diode D1-D4) are converted into rectified voltage VREC.Electric power converter 108 is from rectification
Device 106 receives rectified voltage VRECAnd provided to light source (for example, the first LED chains 120 and the 2nd LED chains 130) defeated after adjusting
Go out electric current IOUT。
In the example of fig. 3, electric power converter 108 includes transformer 110, controlling switch Q3, diode D5 and capacitance C8.
Transformer 110 includes being used to receive rectified voltage V from rectifier 106RECPrimary side winding 305, for 120 and of the first LED chains
2nd LED chains 130 provide output current IOUTVice-side winding 307, magnetic core 311 and for being carried to brightness and color-temperature controller 112
The auxiliary winding 309 of voltage supplied.Transformer 110 shown in Fig. 3 includes three windings and simply illustrates and not limit, other
In embodiment, transformer 110 may include the winding of other varying numbers.In the embodiment shown in fig. 3, it is coupled in primary side winding
305 controlling switch Q3 is located at the outside of brightness and color-temperature controller 112.In other embodiments, controlling switch Q3 can also
It is integrated in the inside of brightness and color-temperature controller 112.
Brightness and color-temperature controller 112 are coupled in the primary side winding 305 and auxiliary winding 309 of transformer 110.Brightness and color
Temperature controller 112 can be flyback pulse width modulation (PWM) controller, be selectivelyed switch on and original for producing pwm signal
The controlling switch Q3 that side winding 305 is connected, and adjust the output current of transformer 110 by adjusting the duty cycle of pwm signal
IOUT.Citing but not limit, the port of brightness and color-temperature controller 112 include port HV, CLK, PWM, VDD, GND, COMP,
CS, FB, SW1 and SW2.
Brightness and color-temperature controller 112 receive rectified voltage V at the HV of portINConduction detection signal TD and according to conducting
Signal TD is detected to adjust the average current for flowing through LED light source (for example, electric current ILED1Or electric current ILED2).Specifically, conduction detection
Signal TD can indicate the conducting state of the TRIAC devices 202 in TRIAC light modulators 104 (for example, leading between 0-180 degree
Current flow angle degree).Brightness and color-temperature controller 112 can provide leading corresponding to TRIAC light modulators 104 based on conduction detection signal TD
The reference signal REF (being described in detail in such as figure 4 below and Fig. 5) of current flow angle degree, and produced according to reference signal REF at the PWM of port
Drive signal DRV flows through the average current of LED light source to adjust (for example, electric current ILED1Or electric current ILED2)。
Advantageously, in response to the rotation process of TRIAC light modulators 104 in primary circuit, the light source (example in secondary circuit
Such as, the first LED chains 120 and the 2nd LED chains 130) brightness be adjusted to correspond to TRIAC tune by brightness and color-temperature controller 112
The target brightness value (for example, 25%, 50%, 75%, 90%, 100% etc.) of the angle of flow of light device 104.
Brightness and color-temperature controller 112 receive the conducting state of instruction ON/OFF switches 102 (for example, connecing at the CLK of port
On-off open state) switch monitors signal TS, and according to switch monitors signal TS produce first control signal CTR1 (in port
At SW1) and second control signal CTR2 (at the SW2 of port) control the first LED chains 120 and the 2nd LED chains 130 respectively.More
Specifically, in one embodiment, if switch monitors signal TS instructions first switch on ON/OFF switches 102, brightness
First control signal CTR1 is produced with color-temperature controller 112 to connect the first controlling switch 122 and produce second control signal
CTR2 disconnects the second controlling switch 132, therefore, electric current ILED1Flow through the first LED chains 120 and flow through the 2nd LED without electric current
Chain 130；If switch monitors signal TS instruction ON/OFF switches 102 are disconnected and are again switched within a predetermined period of time, bright
Degree and color-temperature controller 112 produce first control signal CTR1 to disconnect the first controlling switch 122 and produce the second control letter
Number CTR2 connects the second controlling switch 132, and therefore, no electric current flows through the first LED chains 120, electric current ILED2Flow through the 2nd LED
Chain 130.Because the 2nd LED chains 130 can have the colour temperature different from the first LED chains 120, brightness and color-temperature controller
112 can adjust the colour temperature of light source according to switch monitors signal TS.
Port FB receives instruction from the bleeder circuit (not indicating) for the auxiliary winding 309 for being coupled in transformer 110 and flows through pair
The electric current I of side winding 307SCurrent monitor signal SEN (for example, current monitor signal SEN, which may indicate that, flows through vice-side winding 307
Electric current ISWhen drop to 0).Port CS receives the electric current I that instruction flows through primary side winding 305PMonitoring signals LPSEN.Brightness
Current monitor signal SEN and monitoring signals LPSEN is received with color-temperature controller 112, and drive signal is produced at the PWM of port
DRV controls controlling switch Q3 to adjust the output current I of electric power converter 108OUT.Brightness and color-temperature controller 112 are according to electricity
Stream monitoring signals SEN and monitoring signals LPSEN produces drive signal DRV to control the conducting of controlling switch Q3 at the PWM of port
State (for example, being switched on or switched off state).For example, when current monitor signal SEN instructions flow through the electric current I of vice-side winding 307SUnder
When being down to 0, controlling switch Q3 can be converted into on-state by drive signal DRV from off-state.More specifically, current monitoring
The voltage of signal SEN can flow through the target current value I of light source with instructionTARGETThe voltage of reference signal be compared, monitoring letter
The voltage of number LPSEN can be with indicating target current value ITARGETThe voltage of another reference signal be compared, if any ratio
The instantaneous current value that the instruction of relatively result flows through light source is more than target current value ITARGET, then brightness and color-temperature controller 112, which are reduced, drives
The duty cycle of dynamic signal DRV, vice versa.In one embodiment, if drive signal DRV for first state (for example, logic
High level), then controlling switch Q3 is connected, and electric current flows through primary side winding 305, and magnetic core 311 carries out energy storage.If drive signal
DRV is the second state (for example, logic low), and controlling switch Q3 is disconnected, and is coupled in the diode D5 of vice-side winding 307
Forward bias is so that the energy being stored in magnetic core 311 is discharged to capacitance C8 and light source through vice-side winding 307.Therefore, can be with
The electric energy of light source (for example, the first LED chains 120 and the 2nd LED chains 130) is adjusted according to drive signal DRV.
Port VDD is coupled in auxiliary winding 309.In one embodiment, the energy storage list being coupled between port VDD and ground
First (for example, capacitance C5) powers when ON/OFF switches 102 disconnect for brightness and color-temperature controller 112.Port COMP passes through electricity
Hold and coupled with ground (port GND), for providing error signal.
Advantageously, in response to the opening operation of ON/OFF switches 102 in primary circuit, in the disconnected of ON/OFF switches 102
Open and be again switched in the predetermined amount of time after operation after ON/OFF switches 102, the light source in secondary circuit is (for example, the first LED
120 and the 2nd LED chains 130 of chain) colour temperature target color temperature value is adjusted to (for example, the first colour temperature by brightness and color-temperature controller 112
Value or the second color temperature value).
Fig. 4 show the brightness in Fig. 3 and the structure diagram of color-temperature controller 112.Fig. 4 will be described with reference to Fig. 3.
In the example of fig. 4, brightness and color-temperature controller 112 divide the brightness control module for top half and the colour temperature control of the latter half
Molding block.
The operation principle of brightness control module is as follows：
Brightness control module includes signal generator 410, TRIAC monitors 432 and driver 430.Signal generator 410
Produce monitoring signals (for example, square-wave signal 412).The average voltage of monitoring signals is with flowing through LED light source (for example, the first LED chains
120 or the 2nd LED chain 130) average current IOUT(for example, electric current ILED1Or ILED2) proportional.432 basis of TRIAC monitors
Conduction detection signal TD produces reference signal REF.Reference signal REF instructions flow through LED light source (for example, the first LED chains 120
Or the 2nd LED chain 130) average current target current value (for example, target current value ITARGET).Correspondingly, driver 430
Drive signal DRV is produced based on square-wave signal 412 and reference signal REF.Signal generator 410, driver 430 and transformer
110 composition negative feedback loops.The negative feedback loop keeps the average voltage of square-wave signal 412 to be equal to reference signal REF, so as to keep flowing
Average current I through LED light source (for example, the first LED chains 120 or the 2nd LED chains 130)OUTEqual to target current value ITARGET.Please
Note that the angle of flow of TRIAC light modulators 104 can change with the rotation process of user, therefore reference signal REF is also corresponding
Change.In this way, the adjustment of the brightness to LED light source is realized.
Signal generator 410 includes Acquisition Circuit 402, state detector 404 and multiple selector 408.Acquisition Circuit 402
It is connected with port CS, to receive the monitoring signals LPSEN that instruction flows through the electric current of primary side winding 305.Acquisition Circuit 402 is according to prison
Survey the proportional peak signal V of peak value that signal LPSEN sampling keeps and produces the electric current to flowing through primary side winding 305PK.
In one embodiment, multiple selector 408 includes the switch with first port, second port and the 3rd port.Multi-path choice
The first port of device 408 is connected with the output terminal of Acquisition Circuit 402, for receiving peak signal VPK.The of multiple selector 408
Two-port netwerk is connected with reference ground GND, for receiving predeterminated voltage signal VPRE(for example, VPREFor zero volt).Multiple selector 408
The 3rd port be connected with the input terminal of driver 430, for providing square-wave signal 412.In another embodiment, multichannel is selected
The second port for selecting device 408 may also connect to other signal generators, receive pre-set constant reference voltage.
State detector 404 is connected with port FB, to receive current monitor signal SEN.State detector 404 is according to electric current
Monitoring signals SEN judges whether transformer 110 works in preset state, and produces switch controlling signal 406 to control multichannel to select
Select device 408.More specifically, in one embodiment, when current monitor signal SEN have indication transformer 110 work in it is pre-
If during the first voltage value of state, switch controlling signal 406 has first state (for example, high level).At this time, multiple selector
408 first port and the conducting of the 3rd port.Thus, square-wave signal 412 is equal to peak signal VPK.As current monitor signal SEN
When the second voltage value of preset state is not worked in indication transformer 110, switch controlling signal 406 has the second state
(for example, low level).At this time, the second port of multiple selector 408 and the conducting of the 3rd port.Thus, square-wave signal 412 is equal to
Predeterminated voltage signal VPRE。
Advantageously, TRIAC monitors 432 can adjust reference signal REF according to TRIAC light modulators 104.More specifically
Ground is said, in one embodiment, if conduction detection signal TD indicates TRIAC 202 turn-on instants in each cycle of device
Shifted to an earlier date (that is, angle of flow increases), then TRIAC monitors 432 increase reference signal REF.Thus, LED light source (example is flowed through
Such as, the first LED chains 120 or the 2nd LED chains 130) average current increase.Similarly, if conduction detection signal TD indicates TRIAC
Turn-on instant of the device 202 in each cycle is delayed by (that is, angle of flow reduces), then TRIAC monitors 432 reduce reference
Signal REF.Thus, the average current for flowing through LED light source (for example, the first LED chains 120 or the 2nd LED chains 130) reduces.Brightness
Control module can have other structures, and be not limited to the embodiment of Fig. 4.
Fig. 5 show the structure diagram of the TRIAC monitors 432 in Fig. 4 according to an embodiment of the invention.Fig. 5
It will be described with reference to Fig. 4.In the example of fig. 5, TRIAC monitors 432 include divider 502, comparator 506 and wave filter
510.In one embodiment, divider 502 includes the resistance R7 and resistance R8 of series coupled.Divider 502 receives conducting inspection
Signal TD is surveyed, and instruction rectified voltage V is providedINVoltage division signal 504.Comparator 506 is by voltage division signal 504 and threshold voltage
VTHIt is compared, and square-wave signal 508 is produced according to comparative result.Wave filter 510 filters square-wave signal 508, to produce reference
Signal REF.
More specifically, in one embodiment, in moment T1To moment T2ON time TTRI_ONIt is interior, voltage division signal
504 are more than threshold voltage VTH(for example, zero volt), square-wave signal 508 are switched to high level.In moment T2To moment T3Pass
Disconnected time TTRI_OFFInterior, voltage division signal 504 is less than threshold voltage VTH, square-wave signal 508 is switched to low level.When TRIAC devices
When the turn-on instant of part 202 changes, the average voltage respective change of square-wave signal 508.Wave filter 510 filters square-wave signal
508, so as to provide the reference signal REF proportional to the average voltage of square-wave signal 508.Therefore, by adjusting reference signal
REF can adjust the average current for flowing through LED light source (for example, the first LED chains 120 or the 2nd LED chains 130), it is achieved thereby that root
Brightness adjustment control according to TRIAC light modulators 104 to LED light source (for example, the first LED chains 120 or the 2nd LED chains 130).TRIAC is supervised
Other structures can be had by surveying device 432, and be not limited to the embodiment of Fig. 5.
Driver 430 includes operational amplifier 414, sawtooth waveforms maker 420, comparator 426 and buffer 428.One
In a embodiment, operational amplifier 414 includes operation transconductance amplifier (Operational Transconductance
Amplifier, OTA) 418 and capacitance 416.The positive input of operation transconductance amplifier 418 receives square-wave signal 412, reversely
Input terminal receives reference signal REF.Wherein, reference signal REF represents output current ILED1Or ILED2Target current value ITARGET。
Operation transconductance amplifier 418 produces electric current I according to the difference between square-wave signal 412 and reference signal REF in output terminal418Give
416 charge or discharge of capacitance, so as to produce error signal 422.Due to the ripple on 416 filtering error signal 422 of capacitance, error
Signal 422 by square-wave signal 412 average voltage VSQ_AVGDifference between reference signal REF determines.In another embodiment
In, capacitance 416 passes through a port and 418 phase of operation transconductance amplifier of controller outside brightness and color-temperature controller 112
Even.
Sawtooth waveforms maker 420 produces sawtooth signal SAW.426 comparison error signal 422 of comparator and sawtooth signal
SAW, and produce comparison signal.Buffer 428 receives comparison signal, and produces drive signal DRV (for example, pulsewidth modulation is believed
Number).In the fig. 4 embodiment, if the average voltage V of square-wave signal 412SQ_AVGIncrease, error signal 422 increase therewith, saw
Tooth ripple signal SAW then needs more times to increase to error signal 422.Thus, the duty cycle of drive signal DRV reduces, from
And reduce output current ILED1Or ILED2Average current, until the average voltage V of square-wave signal 412SQ_AVGIt is reduced to reference to letter
Number REF.Similarly, if the average voltage V of square-wave signal 412SQ_AVGReducing, the duty cycle of drive signal DRV can increase, so that
Increase output current ILED1Or ILED2Average current, until the average voltage V of square-wave signal 412SQ_AVGIncrease to reference signal
REF.In this way, output current ILED1Or ILED2Average current can be adjusted to and target current value ITARGETIt is equal, that is, realize
Brilliance control to light source (for example, the first LED chains 120 and the 2nd LED chains 130).
In addition, the operation principle of color temperature control module is as follows：
Fig. 6 show the structure diagram of the color temperature control module in Fig. 4.From the point of view of Fig. 4 and Fig. 6, colour temperature control mould
Block includes determining whether unit 434, NOT gate 436, startup and low pressure locking (UVL) circuit 438 and colour temperature control unit 440.
Start and low pressure locking (UVL) circuit 438 is connected with port VDD, for according to different power levels selectivity
Ground starts one or more components inside brightness and color-temperature controller 112.
In one embodiment, if the voltage on the VDD of port is higher than the first predeterminated voltage, start and low pressure locking is electric
Road 438 will start component all in brightness and color-temperature controller 112.When 102 disconnection of ON/OFF switches, if on the VDD of port
Voltage be less than the second predeterminated voltage, start and low pressure lock-in circuit 438 will close portions in brightness and color-temperature controller 112
Part is to save electric energy.If the voltage on the VDD of port is less than the 3rd predeterminated voltage, starts and low pressure lock-in circuit 438 will close
All components.In one embodiment, the first predeterminated voltage is higher than the second predeterminated voltage, and the second predeterminated voltage is default higher than the 3rd
Voltage.
Identifying unit 434 detects the energy state of brightness and color-temperature controller 112 and is based on brightness and color-temperature controller
112 energy state and produce the first judgement signal VDD_L and second and judge signal VDD_H.112 base of brightness and color-temperature controller
The colour temperature of light source is adjusted in the first judgement signal VDD_L, the second judgement signal VDD_H and switch monitors signal TS.For example,
If the voltage at the port VDD of brightness and color-temperature controller 112 is less than reset threshold voltage (for example, 4V), first judges
Signal VDD_L has first state (for example, logic high)；If the electricity at the port VDD of brightness and color-temperature controller 112
Pressure is more than reset threshold voltage (for example, 4V), then the first judgement signal VDD_L has the second state (for example, logic low)；
If the voltage at the port VDD of brightness and color-temperature controller 112 is less than enabled threshold voltage (for example, 10V), second judges
Signal VDD_H has first state (for example, logic low)；If the electricity at the port VDD of brightness and color-temperature controller 112
Pressure is more than enabled threshold voltage (for example, 10V), then second judges that signal VDD_H has the second state (for example, logically high electricity
It is flat).
Colour temperature control unit 440 is used to judge that signal VDD_L and second judges signal according to switch monitors signal TS, first
VDD_H produces first control signal CTR1 and second control signal CTR2 to control the first LED chains 120 and the 2nd LED chains respectively
130.In one embodiment, colour temperature control unit 440 includes timer 602, the first d type flip flop 604, the second d type flip flop
606th, first with door 608 and second and door 610.Timer 602 receives switch monitors signal TS and in switch monitors signal TS
Occur starting timing during trailing edge, timer 602 also switch monitors signal TS each trailing edge predefined time interval
Pulse signal TS_DE is produced after Δ t.Pulse signal TS_DE is coupled in the input port CLK of the first d type flip flop 604, and
Switch monitors signal TS is coupled in the input port CLK of the second d type flip flop 606.The input port D1 couplings of first d type flip flop 604
Together in its output portAnd the output port Q1 of the first d type flip flop 604 is coupled in the input terminal of the second d type flip flop 606
Mouth D2.
The input port R of first d type flip flop 604 and the second d type flip flop 606 is each coupled to the output port of NOT gate 436, and
And the input port of NOT gate 436 is coupled in identifying unit 434.If the voltage at the port VDD of brightness and color-temperature controller 112
Less than reset threshold voltage (for example, 4V), first judges that signal VDD_L is logic high, then the first d type flip flop 604 and the
2-D trigger 606 is all reset by NOT gate 436, therefore, output port Q1 and the 2nd the D triggering of the first d type flip flop 604
The output port Q2 of device 606 is reset as logic low, and the output port of the first d type flip flop 604Touched with the 2nd D
Send out the output port of device 606All it is reset as logic high.
Second judges the output port Q of signal VDD_H and the second d type flip flop 6062It is each coupled to first and door 608, first
The electric current I for producing first control signal CTR1 with door 608 to control the first controlling switch 122 and flow through the first LED chains 120LED1。
The output port Q2 of second judgement signal VDD_H and the second d type flip flop 606 is each coupled to second and door 610, and second and door 610
The electric current I for producing second control signal CTR2 to control the second controlling switch 132 and flow through the 2nd LED chains 130LED2.With this side
Formula, brightness and color-temperature controller 112 can switch 102 opening operation in response to ON/OFF and adjust the colour temperature of light source.
Fig. 7 show the signal waveforms of the light source driving circuit comprising the color temperature control module shown in Fig. 6.Fig. 7 is shown
Switch monitors signal TS, pulse signal TS_DE, first judge that signal VDD_L, second judge signal VDD_H, input port D1
Voltage, the voltage at output port Q2, first control signal CTR1 and second control signal at the voltage at place, output port Q1
The signal waveform of CTR2.Fig. 7 will be described with reference to Fig. 3 and Fig. 6.
At the t0 moment, ON/OFF switches 102 are connected.At the t1 moment, switch monitors signal TS is from first state (for example, patrolling
Volume low level) change into the second state (for example, logic high), the voltage at the VDD of port increases to reset threshold voltage (example
Such as, 4V) and first judgement signal VDD_L change into the second state (for example, patrolling from first state (for example, logic high)
Collect low level).Voltage at the t2 moment, port VDD increases to enabled threshold voltage (for example, 10V) and second judges letter
Number VDD_H changes into the second state (for example, logic high) from first state (for example, logic low).Arrived at the t0 moment
In the time interval at t2 moment, the output port Q2 of the output port Q1 of the first d type flip flop 604 and the second d type flip flop 606 is
Logic low.Since first and door 608 and second and door 610 receives second judge that signal VDD_H is logic low, the
One control signal CTR1 and second control signal CTR2 is also logic low.After instant t 2, since second judges letter
Number VDD_H changes into logic high, and first control signal CTR1 also changes into logic high, therefore, the first controlling switch
122 connections and electric current ILED1Begin flow through the first LED chains 120.At the t3 moment, ON/OFF switch 102 disconnect, and brightness and
Voltage at the port VDD of color-temperature controller 112 is begun to decline.Once as described above, there is trailing edge in switch monitors signal TS,
Pulse signal TS_DE can be produced after predefined time interval Δ t.At the t4 moment, occur in response to pulse signal TS_DE
Rising edge, the input port D1 of the first d type flip flop 604 changes into logic low from logic high, and the first D is triggered
The output port Q1 of device 604 changes into logic high from logic low.Voltage at the t5 moment, port VDD is reduced to
Enabled threshold voltage (for example, 10V), and the second judgement signal VDD_H is changed into from the second state (for example, logic high)
First state (for example, logic low).Therefore, because first judges signal with door 608 and second and door 610 receives second
VDD_H is logic low, and first control signal CTR1 and second control signal CTR2 are also logic lows.
At the t6 moment, there is rising edge in switch monitors signal TS, and instruction ON/OFF switches 102 are again switched on.The t3 moment arrives
The time interval at t6 moment is less than predetermined (regulation) time interval (for example, t6-t3<3 seconds) so that the voltage at the VDD of port is protected
Hold more than reset threshold voltage (for example, 4V) and the first judgement signal VDD_L remains logic low.In response to switch
The rising edge that monitoring signals TS occurs, the output port Q2 of the second d type flip flop 606 change into logically high electricity from logic low
It is flat, and its output portLogic low is changed into from logic high.Time similar to the t1 moment to the t2 moment
Interval, from the t6 moment to the time interval at t7 moment, first control signal CTR1 and second control signal CTR2 are logic lows
Level.After the t7 moment, the voltage at the VDD of port increases to more than enabled threshold voltage, and second judges that signal VDD_H changes
For logic high, and second control signal CTR2 also changes into logic high, and the second controlling switch 132 is connected and electricity
Flow ILED2Begin flow through the 2nd LED chains 130.Then, ON/OFF switches 102 are again off, and at the VDD of t8 moment ports
Voltage is reduced to enabled threshold voltage (for example, 10V).Signal waveform in from the t8 moment to the time interval at t10 moment is similar
Signal waveform in from the t0 moment to the time interval at t5 moment.At the t9 moment, the first controlling switch 122 is connected and electric current
ILED1Begin flow through the first LED chains 120.
Therefore, brightness and color-temperature controller 112 are alternatively switched on the first control in response to the opening operation of ON/OFF switches 102
System switch 122 and the second controlling switch 132, since the 2nd LED chains 130 can have the colour temperature different from the first LED chains 120,
Therefore, brightness and color-temperature controller 112 can adjust the colour temperature of light source in response to the opening operation of ON/OFF switches 102.
The light source comprising the color temperature control module shown in Fig. 6 that Fig. 8 show according to another embodiment of the invention drives
The signal waveforms of dynamic circuit.Fig. 8 shows that switch monitors signal TS, pulse signal TS_DE, first judge signal VDD_L, the
Two judge the voltage at signal VDD_H, input port D1, the voltage at output port Q1, the voltage at output port Q2, first
The signal waveform of control signal CTR1 and second control signal CTR2.Fig. 8 will be described with reference to Fig. 3, Fig. 6 and Fig. 7.
From t0 moment to t6 ' waveform in the time interval at moment be similar in Fig. 7 slave the t0 moment to t6 moment when
Between be spaced in waveform.At the t7 ' moment, ON/OFF switches 102 are again switched on.The time interval at t3 moment to t7 ' moment is more than
Predetermined time interval is (for example, t7 '-t3>3 seconds).Therefore, the voltage at the t6 ' moment, port VDD is reduced to reset threshold electricity
Press (for example, 4V), and the first judgement signal VDD_L changes into logic high from logic low, output port Q1 and defeated
Exit port Q2 is reset as logic low.Since first and door 608 and second and door 610 receives second judge signal
VDD_H is logic low, and first control signal CTR1 and second control signal CTR2 are also logic low.
At the t8 ' moment, switch monitors signal TS changes into the second state (example from first state (for example, logic low)
Such as, logic high), the voltage at the VDD of port increases to reset threshold voltage (for example, 4V), and first judges signal
VDD_L changes into the second state (for example, logic low) from first state (for example, logic high).At the t9 ' moment, end
Voltage at mouth VDD increases to enabled threshold voltage (for example, 10V), and second judges signal VDD_H from first state (example
Such as, logic low) change into the second state (for example, logic high).T7 ' the moment is into the time interval at t9 ' moment
Signal waveform is similar to the t0 moment to the signal waveform in the time interval at t2 moment.After the t9 ' moment, at the VDD of port
Voltage increases to more than enabled threshold voltage, and the second judgement signal VDD_H changes into logic high, and first control signal
CTR1 also changes into logic high.Then, the first controlling switch 122 is connected and electric current ILED1Begin flow through the first LED chains
120。
If as shown in fig. 7, the opening operation and next making operation of switch monitors signal TS instruction ON/OFF switches 102
Between time interval be less than predetermined time interval (for example, 3 seconds), then brightness and color-temperature controller 112 are opened in response to ON/OFF
102 next making operation is closed by the colour temperature of light source (for example, the first LED chains 120 and the 2nd LED chains 130) from the first color temperature value
Change into the second color temperature value.More specifically, in the example in figure 7, during first time interval (for example, from the t2 moment to
The time interval at t5 moment), first control signal CTR1 is logic high, and the first LED chains 120 are connected, the 2nd LED chains 130
Disconnect, so that the colour temperature of light source is adjusted to the first color temperature value；During the second time interval different from first time interval
(for example, from t7 moment to the time interval at t8 moment), second control signal CTR2 are logic high, and the first LED chains 120 are disconnected
Open, the 2nd LED chains 130 are connected, so that the colour temperature of light source is adjusted to the second color temperature value.Therefore, brightness and color-temperature controller 112
By being alternatively switched on the first controlling switch 122 and the second controlling switch 132 by the colour temperature of light source from the first LED chains 120
Colour temperature changes into the colour temperature of the 2nd LED chains 130.If however, as shown in figure 8, switch monitors signal TS instruction ON/OFF switches
Time interval between 102 opening operation and next making operation is more than predetermined time interval (for example, 3 seconds), then brightness and
The colour temperature of light source is reset to preset color temperature value by color-temperature controller 112 in response to next making operation of ON/OFF switches 102.
In the example of Fig. 8, preset color temperature value can be the color temperature value of the first LED chains 120, for example, the color temperature value that by dispatching from the factory when is set；In advance
If color temperature value is not limited to the color temperature value shown in the example of Fig. 8.
Fig. 9 show control light-source brightness according to embodiments of the present invention and the method flow diagram 900 of colour temperature.Fig. 9 will be tied
Figure 1A-Fig. 8 is closed to be described.The specific steps covered in Fig. 9 are merely exemplary, i.e. the present invention is adapted for carrying out various
Other steps or in Fig. 9 state the step of be improved the step of.
In step 902, drive circuit (for example, light source driving circuit 100 or 300) receives electric energy and by electricity from power supply
After force transducer (such as electric power converter 108) provides adjusting to light source (for example, the first LED chains 120 and the 2nd LED chains 130)
Electric energy.
In step 904, the reference signal that instruction flows through the target current value of light source is adjusted according to conduction detection signal,
So as to which accordingly adjustment flows through the average current of light source, and then adjust the brightness of light source.In one embodiment, by brightness and colour temperature
Controller 112 receives the conducting inspection of the conducting state for the TRIAC light modulators 104 that instruction is coupling between power supply and electric power converter
Survey signal TD, and based on conduction detection signal TD come adjust instruction flow through light source target current value reference signal.Specifically,
The conducting state of TRIAC devices 202 in conduction detection signal TD instruction TRIAC light modulators 104 is (for example, between 0-180 degree
Angle of flow).Brightness and color-temperature controller 112 can be provided according to conduction detection signal TD corresponds to TRIAC light modulators 104
Angle of flow reference signal REF (as being described in detail in above-mentioned Fig. 4 and Fig. 5), and according to reference signal REF in port
Drive signal DRV is produced at PWM to adjust the average current for flowing through LED light source (for example, electric current ILED1Or electric current ILED2)。
In step 906, switch monitors signal is received, switch monitors signal is (for example, by brightness and color-temperature controller 112
The switch monitors signal TS of reception) instruction is coupling in ON/OFF between power supply and electric power converter and switchs (for example, ON/OFF is opened
Close operation 102).
In step 908, the colour temperature based on switch monitors signal TS adjustment light sources.For example, during first time interval
(for example, the time interval at t2 moment to t5 moment in the figure 7), brightness and color-temperature controller 112 can produce the first control
Signal CTR1 connects the first LED chains 120 with the first color temperature value, and produces second control signal CTR2 and have to disconnect
2nd LED chains 130 of the second color temperature value, so that the colour temperature of light source is adjusted to the first color temperature value；Different between first time
Every the second time interval during (for example, the time interval at t7 moment to t8 moment in the figure 7), brightness and color-temperature controller
112 can produce first control signal CTR1 to disconnect the first LED chains 120, and produce second control signal CTR2 to connect
2nd LED chains 130, so that the colour temperature of light source is adjusted to the second color temperature value.
In this way, brightness and color-temperature controller 112 not only can adjust light source according to the operation of ON/OFF switches 102
The colour temperature of (for example, the first LED chains 120 and the 2nd LED chains 130), can also at the same time according to the operation of TRIAC light modulators 104 come
The brightness of LED light source (for example, the first LED chains 120 and the 2nd LED chains 130) is adjusted, without using extra dedicated devices,
It is simple and convenient and save cost.
Above description is that the embodiment based on LED chains illustrates.However, it can also apply according to an embodiment of the invention
To other types of light source.In other words, the embodiment of the present invention is not limited to LED light source, is equally applicable to other types of light
Source.
Herein using wording and expression contribute to it is illustrative and not limiting, using these wording and expression will not herein
Any equivalent (or part equivalent) of diagram and the characteristic of description is excluded outside invention scope, in the scope of claim
It is interior that there may be various modifications.Others modification, variation and alternative also likely to be present.Therefore, claim is intended to institute
There is such equivalent.
Claims (9)
1. a kind of light source driving circuit, for adjusting brightness and the colour temperature of light source, the light source is included with the first color temperature value
First light-emitting component and the second light-emitting component with the second color temperature value, it is characterised in that the light source driving circuit includes：
Electric power converter, is coupling between power supply and the light source, for receiving electric energy and to the light source from the power supply
Electric energy after adjusting is provided；And
Brightness and color-temperature controller, are coupled in the electric power converter, and the power supply and the electricity are coupled in for receiving instruction
The conduction detection signal of the conducting state of triode-thyristor light modulator between force transducer, and believed based on the conduction detection
Number adjust the brightness of the light source, wherein the brightness and color-temperature controller be additionally operable to receive instruction be coupled in three end can
The switch monitors signal of the operation of the ON/of silicon light modulator is controlled, and it is described to adjust based on the switch monitors signal
The colour temperature of light source,
Wherein, the brightness and color-temperature controller include：
Identifying unit, the identifying unit are used for the energy state for detecting the brightness and color-temperature controller and based on described bright
The energy state of degree and color-temperature controller produces first and judges that signal and second judges signal；And
Colour temperature control unit, the colour temperature control unit be used for according to described first judge signal, it is described second judge signal and
The switch monitors signal produces first control signal and second control signal, wherein, the first control signal is optionally
The first controlling switch being coupling between the brightness and color-temperature controller and first light-emitting component is connected so that the light
The colour temperature in source is adjusted to first color temperature value, and the second control signal, which selectivelyes switch on, is coupling in the brightness and color
The second controlling switch between temperature controller and second light-emitting component is so that the colour temperature of the light source is adjusted to described
Two color temperature values.
2. light source driving circuit according to claim 1, it is characterised in that the brightness and color-temperature controller further include：
Signal generator, the proportional monitoring signals of average current for producing to flowing through the light source；
Triode-thyristor monitor, for receiving the conduction detection signal and producing instruction according to the conduction detection signal
Flow through the reference signal of the desired value of the average current of the light source；And
Driver, is coupled in the signal generator and the triode-thyristor monitor, for according to the monitoring signals and
The reference signal produces drive signal, to control the electric power converter to provide the electric energy after the adjusting to the light
Source.
3. light source driving circuit according to claim 2, it is characterised in that the signal generator, the driver and
Transformer composition negative feedback loop in the electric power converter, the negative feedback loop are maintained to flow through the average electricity of the light source
Stream is equal to the desired value.
4. light source driving circuit according to claim 2, it is characterised in that three ends described in the conduction detection signal designation
The angle of flow of controllable silicon dimmer, if angle of flow described in the conduction detection signal designation increases, three end can
Control silicon monitor increases the reference signal and the driver adjusts the drive signal and flows through the light source to increase
The average current, and if angle of flow described in the conduction detection signal designation reduces, the triode-thyristor prison
Survey the device reduction reference signal and the driver adjusts the drive signal and flows through the described flat of the light source to reduce
Equal electric current.
5. light source driving circuit according to claim 1, it is characterised in that the colour temperature control unit includes：
Timer, for receiving the switch monitors signal, the timer is when trailing edge occurs in the switch monitors signal
Start timing, and pulse signal is produced after the predefined time interval of the trailing edge；
First d type flip flop, for receiving the pulse signal；And
Second d type flip flop, is coupled in first d type flip flop, for receiving the switch monitors signal；
Wherein described first control signal and the second control signal are the output signals based on second d type flip flop and produce
Raw.
6. light source driving circuit according to claim 1, it is characterised in that if described in the switch monitors signal designation
Time interval between the opening operation of ON/and next making operation is less than predetermined time interval, then the brightness and
Color-temperature controller in response to the ON/ next making operation by the colour temperature of the light source from the first color temperature value tune
Whole is the second color temperature value.
7. light source driving circuit according to claim 1, it is characterised in that if described in the switch monitors signal designation
Time interval between the opening operation of ON/and next making operation is more than predetermined time interval, then the brightness and
The colour temperature of the light source is reset to preset color temperature by color-temperature controller in response to next making operation of the ON/
Value.
8. light source driving circuit according to claim 1, it is characterised in that the light source driving circuit further includes rectification
Device, the electric power converter include transformer, and the transformer includes primary side winding, vice-side winding and auxiliary winding, the original
Side winding coupled in the rectifier and by the rectifier from the power supply receive electric energy, the vice-side winding be used for
The light source provides the electric energy after the adjusting, and the auxiliary winding is used to power to the brightness and color-temperature controller, described
ON/and the triode-thyristor light modulator are coupling between the power supply and the rectifier.
9. light source driving circuit according to claim 1, it is characterised in that the brightness and color-temperature controller are used to receive
Instruction flows through the current monitor signal of the current value of the light source, and is provided according to current monitor signal control to described
Electric energy after the adjusting of light source.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410729730.5A CN105657932B (en) | 2014-12-04 | 2014-12-04 | Light source driving circuit and brightness and color-temperature controller |
| TW104139427A TWI653907B (en) | 2014-12-04 | 2015-11-26 | A driver circuit for a light source, and a controller for luminance and color temperature |
| US14/954,613 US9781793B2 (en) | 2008-12-12 | 2015-11-30 | Controlling brightness and color temperature of light sources |
| JP2015235511A JP2016111018A (en) | 2014-12-04 | 2015-12-02 | Controlling brightness and color temperature of light sources |
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| CN201410729730.5A CN105657932B (en) | 2014-12-04 | 2014-12-04 | Light source driving circuit and brightness and color-temperature controller |
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| CN105657932B true CN105657932B (en) | 2018-05-15 |
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| CN106211486B (en) * | 2016-08-31 | 2018-09-28 | 深圳市明微电子股份有限公司 | A kind of LED lamp and its light modulation toning circuit |
| CN106793317B (en) * | 2016-12-30 | 2018-12-14 | 杰华特微电子（杭州）有限公司 | Light adjusting circuit, light-dimming method and LED drive circuit |
| CN106973468B (en) * | 2017-05-26 | 2018-09-14 | 深圳市安吉丽光电科技有限公司 | A kind of LED light modulation toning circuits based on DOB designs |
| CN107172745B (en) * | 2017-06-05 | 2019-04-30 | 广州视源电子科技股份有限公司 | Colour temperature Automatic adjustment method, device and lamp mirror |
| TWI698153B (en) * | 2017-12-20 | 2020-07-01 | 美商亮銳公司 | Dimmer switch interface and led light system |
| CN110392461A (en) * | 2018-04-18 | 2019-10-29 | 凹凸电子（武汉）有限公司 | Controller, light source driving circuit and the method for controlling light source module |
| CN112672460A (en) * | 2019-10-15 | 2021-04-16 | 凹凸电子(成都)有限公司 | Controller and method for controlling light source module |
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| CN202551428U (en) * | 2012-03-20 | 2012-11-21 | 厦门高贤电子科技有限公司 | Regulation and control device for LED (light-emitting diode) lamp |
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| TWI448191B (en) | 2012-01-10 | 2014-08-01 | Univ Nat Taipei Technology | Feedback control to reduce power consumption light-emitting diode driving device |
| TWI452928B (en) | 2012-09-26 | 2014-09-11 | Anteya Technology Corp | LED device and its color temperature and brightness control method and device |
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| CN102316648A (en) * | 2011-09-15 | 2012-01-11 | 四川新力光源有限公司 | Light-emitting diode (LED) illuminating device |
| CN202551428U (en) * | 2012-03-20 | 2012-11-21 | 厦门高贤电子科技有限公司 | Regulation and control device for LED (light-emitting diode) lamp |
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| TWI653907B (en) | 2019-03-11 |
| TW201633848A (en) | 2016-09-16 |
| CN105657932A (en) | 2016-06-08 |
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