CN105992437A - Light source drive circuit and light source module - Google Patents
Light source drive circuit and light source module Download PDFInfo
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- CN105992437A CN105992437A CN201510082437.9A CN201510082437A CN105992437A CN 105992437 A CN105992437 A CN 105992437A CN 201510082437 A CN201510082437 A CN 201510082437A CN 105992437 A CN105992437 A CN 105992437A
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Abstract
The invention provides a light source drive circuit and a light source module. The light source drive circuit is composed of a rectifier, a power converter, and a light source module; the rectifier is used for receiving a voltage from a power supply and generating a rectification voltage; the power converter coupled with the rectifier is used for receiving the rectification voltage and providing an output current to the light source module for power supplying. The light source module consists of a first light source having a first color, a second light source having a second color, and a current distribution unit coupled with the first light source and the second light source; the current distribution unit adjusts a current flowing through the first light source and a current flowing through the second light source according to an output current. According to the light source drive circuit, the brightness and color of the light source can be adjusted simultaneously by a traditional switch.
Description
Technical field
The present invention relates to a kind of drive circuit, especially relate to a kind of light source driving circuit and light source die
Block.
Background technology
It is known that light emitting diode (LED) light source compared to conventional incandescent have energy-conserving and environment-protective,
The advantages such as luminous efficiency height, length in service life.Therefore, it is current for replacing electric filament lamp with LED light source
The inexorable trend of development.LED bulb is the one in LED lamp, and it has and conventional incandescent
Similar profile and size, bulb includes LED light source and control chip.Utilize existing electricity
Lamp switch, such as traditional ON/OFF dimmer (on/off switch dimmer), typically can only control LED
The on or off of bulb, or control the brightness of bulb, and the color of light cannot be regulated.If needed
The color of light to be regulated, then need to utilize special switch or remote controller.
Summary of the invention
The invention provides a kind of light source driving circuit, including commutator, power converter and light source die
Block.Commutator from the voltage of power supply and produces commutating voltage for reception.Power converter is with described
Rectifier couples, is used for receiving described commutating voltage and providing output electric current to power to light source module.Light
Source module include having the first color the first light source, have the second color secondary light source and with institute
Stating the first light source and the current distribution unit of described secondary light source coupling, current distribution unit is according to described
Output electric current regulation flows through the electric current of described first light source and flows through the electric current of described secondary light source.
Present invention also offers a kind of light source module, including there is the first light source of the first color, having
The secondary light source of the second color and the electric current coupled with described first light source and described secondary light source divide
Join unit.Current distribution unit regulates according to the input current of light source module and flows through described first light source
Electric current and the electric current flowing through described secondary light source.
The light source driving circuit provided by the present invention and light source module, utilize traditional on and off switch i.e.
Brightness and the color of light source can be regulated simultaneously.
Accompanying drawing explanation
Below by way of combining the description of some embodiments of the present invention and accompanying drawing thereof, it will be further appreciated that
The purpose 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 circuit diagram of light source driving circuit according to an embodiment of the invention；
The circuit diagram of the controller that Fig. 3 show in Fig. 2；
The oscillogram of the controller that Fig. 4 show in Fig. 2；
The oscillogram of the light source driving circuit that Fig. 5 show in Fig. 2；
The circuit diagram of the current distribution unit that Fig. 6 show in Fig. 2；
Fig. 7 show the first light source and the current waveform figure of secondary light source in Fig. 2；
The circuit diagram of the another kind of embodiment of the controller that Fig. 8 show in Fig. 2；And
The oscillogram of the light source driving circuit that Fig. 9 show in Fig. 2.
Detailed description of the invention
Hereinafter embodiments of the invention will be provided detailed description.Although the present invention is implemented by these
Mode is illustrated and illustrates, but it should be noted that the present invention is not merely confined to these and implements
Mode.On the contrary, in the present invention contains spirit defined in appended claim and invention scope
All substitutes, variant and equivalent.
It addition, in order to better illustrate the present invention, detailed description of the invention below gives numerous
Detail.It will be understood by those skilled in the art that do not have these details, the present invention equally may be used
To implement.In other example, for known method, flow process, element and circuit not
It is described in detail, in order to highlight the purport of the present invention.
Fig. 1 show the circuit signal of light source driving circuit 100 according to an embodiment of the invention
Figure.Light source driving circuit 100 comprises commutator 204.Commutator 204 is by and off switch 1002
Couple with power supply 202, for receiving the voltage from power supply 202, and carry for power converter 206
For commutating voltage.Power converter 206 receives commutating voltage and for loading (such as light source module 118)
Output electric current is provided.Power converter 206 can be buck converter or booster converter.One
In individual embodiment, power converter 206 comprises energy-storage units 214 and for monitoring energy-storage units 214
The current monitor 278 (such as one resistance) of situation.Current monitor 278 is controller 210
Thering is provided the first signal ISEN, this first signal ISEN instruction flows through the instantaneous electricity of energy-storage units 214
Stream.Controller 210 receives the first signal ISEN and utilizes wave filter (figure 3 illustrates) to
One signal ISEN is filtered producing the second letter that instruction flows through the average current of energy-storage units 214
Number IAVG, and (i.e. power converter 206 is defeated to control to flow through the average current of energy-storage units 214
Go out electric current IOUT, this electric current namely the input current of light source module 118) so that this average current with
Target current value is equal.Light source module 118 includes the first light source 121 and secondary light source 122.First
Light source 121 can be the first light emitting diode chain LED1 with the first color (such as warm light).
Secondary light source 122 can be the second light emitting diode chain with the second color (such as cold light)
LED2.Light source module 118 also includes the electric current coupled with the first light source 121 and secondary light source 122
Allocation unit 201, for the output electric current I according to power converter 206OUTRegulation flows through the first light
The electric current in source 121 and the electric current flowing through secondary light source 122.
Fig. 2 show the circuit signal of light source driving circuit 200 according to an embodiment of the invention
Figure.Fig. 2 numbers with Fig. 1 identical parts there is similar function.In the example in figure 2, light
Source driving circuit 200 comprises commutator 204, power converter 206, controller 210 and light source die
Block 118.Commutator 204 can be the bridge rectifier comprising diode D1-D4.Commutator 204
Coupled with power supply 202 by and off switch 1002, and adjust the voltage from power supply 202.Electric power
Changer 206 receive commutator 204 output adjustment after commutating voltage and provide output electric current IOUT
For load (such as light source module 118) power supply.In one embodiment, on and off switch 1002 is to put
Conventional power source switch on metope.
In the example in figure 2, power converter 206 is buck converter.This buck converter comprises
Electric capacity the 308, first switch 316, diode 314, current monitor (such as resistance 218), storage
Can unit 214 (comprising the inductance 302 and inductance 304 electromagnetically coupled to each other) and electric capacity 324.
Diode 314 is between switch 316 and the ground of light source driving circuit 200.Electric capacity 324 and light source
Module 118 is in parallel.
Inductance 302 and inductance 304 are connected to a common node 333.In the example in figure 2,
Node 333 is between resistance 218 and inductance 302.But the present invention is not limited to this structure, joint
Point 333 can also be between switch 316 and resistance 218.Node 333 provides for controller 210
With reference to ground.In one embodiment, the reference ground of controller 210 and the ground of light source driving circuit 200
Different.By switching on and off switch 316, the electric current flowing through inductance 302 can be adjusted, from
And regulate the output electric current I of power converter 206OUT.Inductance 304 monitors the situation of inductance 302,
Such as, monitoring flows through the current value whether electric current of inductance 302 is reduced to preset.
Node between one end of resistance 218 with switch 316 and diode 314 negative electrode is connected, another
End is connected with inductance 302.Resistance 218 provides the first signal ISEN, when switch 316 connects on and off
When opening, this first signal ISEN all can indicate the transient current flowing through inductance 302.In other words, no
Pipe switch 316 connection is also off, and resistance 218 all can monitor the transient current flowing through inductance 302.
Controller 210 receives the first signal ISEN, and makes stream by being switched on or switched off switch 316
Through the average current of inductance 302 equal to target current value.Electric capacity 324 filters output electric current IOUT's
Ripple so that the input current of light source module 118 relatively steadily and is equal to flow through the average of inductance 302
Electric current, so that the input current of light source module 118 is equal with target current value.Herein " with target
Current value is equal " it is to be sent to from inductance 304 with ignoring in the undesirable situation not considering component
In the case of the electric power of controller 210.
In the example of Fig. 2, the port of controller 210 include ZCD, GND, DRV, VDD,
CS, COMP and CLK.Port ZCD couples with inductance 304, is used for receiving instruction inductance 302
The monitoring of situation (such as, flowing through the current value " 0 " whether the electric current of inductance 302 is reduced to preset)
Signal AUX.Port DRV couples with switch 316, is used for producing driving signal (such as pulse width
Modulated signal PWM1) to be switched on or switched off switch 316.Port VDD couples also with inductance 304
Receive the electric power of self-inductance 304.Port CS couples with resistance 218, is used for receiving instruction and flows through
First signal ISEN of the transient current of inductance 302.Port COMP is by electric capacity 318 and control
The reference ground coupling of device 210.Port CLK is connected to commutator 204 by resistance R3 and passes through
Resistance R6 be connected to (i.e. port CLK by the partial pressure unit comprising resistance R3 and R6 and
Commutator 204 couples with on and off switch 1002), for monitoring the action of on and off switch 1002.?
In one embodiment, controller 210 receives the of instruction on and off switch 1002 by port CLK
The light modulation of the light modulation request signal of set and second group of action of instruction on and off switch 1002 terminates
Signal, and adjust output electric current I according to light modulation request signal and light modulation termination signalOUT.Specifically,
Controller 210 adjusts output electric current I under the effect of light modulation request signal continuouslyOUT, terminate in light modulation
Stop under the effect of signal adjusting output electric current IOUT.In the example in figure 2, port GND is (also
The i.e. reference ground of controller 210) it is connected to node 333.
Switch 316 can be N-type mos field effect transistor (N-type
MOSFET).The conducting state of switch 316 is by switching the grid voltage of 316 and port GND's
Voltage difference between voltage (i.e. the voltage of node 333) determines.Therefore, port DRV exports
Pulse width modulating signal PWM1 determines the state of switch 316.When switch 316 connection, control
The reference ground of device 210 processed is higher than the ground of light source driving circuit 200 so that the circuit of the present invention can be fitted
For having the power supply of high voltage.
When switching 316 connection, electric current flows through switch 316, resistance 218, inductance 302, light source
Module 118 is to the ground of light source driving circuit 200.When switch 316 disconnection, electric current flow through resistance 218,
Inductance 302, light source module 118 and diode 314.Inductance 304 couples with inductance 302 and can
The situation of monitoring inductance 302, such as, monitoring flows through whether the electric current of inductance 302 is reduced to preset electricity
Flow valuve.Controller 210 flows through the electric current of inductance 302 according to signal AUX and ISEN monitoring, and
Switch 316 is controlled so that flow through the average of inductance 302 by pulse width modulating signal PWM1
Electric current is equal to target current value.So after electric capacity 324 filters, the output of power converter 206
Electric current IOUTIt is also equal to target current value.
Fig. 3 show the circuit diagram of Fig. 2 middle controller 210.Fig. 4 show in Fig. 3 control
The oscillogram of device 210.Fig. 3 will be described in conjunction with Fig. 2 and Fig. 4.
In the example in figure 3, controller 210 comprises dimming unit 301, wave filter 303, error
Amplifier 602, comparator 604, going sawtooth signal generator 606, reset signal generator 608
With pulse width modulating signal generator 610.Dimming unit 301 monitors on and off switch 1002 in Fig. 2
Action, by port CLK receive light modulation request signal and light modulation termination signal and produce light modulation letter
Number SET, wherein, the set of light modulation request signal instruction on and off switch 1002, light modulation is eventually
Second group of action of stop signal instruction on and off switch 1002, dim signal SET instruction flows through inductance
The target current value of the average current of 302.First signal ISEN is filtered also by wave filter 303
Secondary signal IAVG indicating the average current flowing through inductance 302 is provided.In the example in figure 3,
It is internal that wave filter 303 is integrated in controller 210, and in other examples, wave filter 303 is permissible
It is positioned at the outside of controller 210.Error amplifier 602 is according to dim signal SET and secondary signal
Voltage difference between IAVG produces error signal VEA, is made by the effect of error signal VEA
Flow through the average current of inductance 302 equal to target current value.Going sawtooth signal generator 606 produces saw
Tooth ripple signal SAW.Comparator 604 and error amplifier 602 and going sawtooth signal generator 606
Coupling, and error signal VEA is compared with sawtooth signal SAW.Reset signal produces
Device 608 couples with port ZCD, and the signal AUX received according to port ZCD produces and resets
Signal RESET, reset signal RESET acts on going sawtooth signal generator 606 and pulse width
Degree modulated signal generator 610.So that switch 316 under the effect of reset signal RESET
Connect.Signal AUX instruction flows through whether the electric current of inductance 302 is reduced to pre-set current value (such as
It is reduced to 0).Pulse width modulating signal generator 610 produces with comparator 604 and reset signal
Raw device 608 couples, and the output and reset signal RESET according to comparator 604 produces pulse width
Degree modulated signal PWM1.Pulse width modulating signal PWM1 controls switch by port DRV
The conducting state of 316.
When switching 316 connection, electric current flows through switch 316, resistance 218, inductance 302, light source
Module 118 is to the ground of light source driving circuit 200.In one embodiment, when switching 316 connection,
The voltage of signal AUX is negative value.When switch 316 disconnection, the voltage of signal AUX become on the occasion of.
When switch 316 disconnection, electric current flows through resistance 218, inductance 302, light source module 118 and diode
314, the electric current flowing through inductance 302 is gradually reduced, when the electric current flowing through inductance 302 is reduced to preset
Current value (is such as reduced to 0), and the voltage of signal AUX can produce a trailing edge.At signal AUX
Under the effect of trailing edge, reset signal RESET of reset signal generator 608 output produces one
Individual pulse.Under the effect of the pulse of reset signal RESET, pulse width modulating signal generator
610 generations have the pulse width modulating signal PWM1 of the first state (such as logic 1) to turn on
Close 316.Under the effect of the pulse of reset signal RESET, going sawtooth signal generator 606 produces
The voltage of raw sawtooth signal SAW starts to increase from initial value INI.When sawtooth signal SAW
Voltage increase to the voltage of error signal VEA, pulse width modulating signal generator 610 produces
There is the pulse width modulating signal PWM1 of the second state (such as logical zero) to disconnect switch 316,
And the voltage of sawtooth signal SAW is reset to initial value INI.Until reset signal RESET
Next pulse when arriving, the voltage of sawtooth signal SAW just starts again from initial value INI to increase
Greatly.
In one embodiment, the dutycycle of pulse width modulating signal PWM1 is by error signal
VEA determines.If the voltage that the voltage of secondary signal IAVG is less than dim signal SET, then miss
Difference amplifier 602 increases the voltage of error signal VEA to increase pulse width modulating signal PWM1
Dutycycle so that the average current flowing through inductance 302 increases, until secondary signal IAVG
Voltage increase to the voltage of dim signal SET.If the voltage of secondary signal IAVG is more than adjusting
The voltage of optical signal SET, then error amplifier 602 reduces the voltage of error signal VEA to reduce
The dutycycle of pulse width modulating signal PWM1, so that flow through the average current of inductance 302
Reduce, until the voltage of secondary signal IAVG is reduced to the voltage of dim signal SET.So,
The average current flowing through inductance 302 can be adjusted to equal with target current value.
The oscillogram of the light source driving circuit 200 that Fig. 5 show in Fig. 2.Dimming unit in Fig. 3
The function of 301 will be described in conjunction with Fig. 5.Dimming unit 301 include trigger monitoring means 305,
Timer 307 and D/A converter 311.In one embodiment, timer 307 includes enumerator
309.Trigger monitoring means 305 to terminate believing by port CLK reception light modulation request signal and light modulation
Number, and enable signal EN and start according to light modulation request signal and light modulation termination signal generation or close
Timer 307.Timer 307 timing under the control of described enable signal EN.D/A converter
311 produce dim signal SET to regulate power converter 206 for the output according to timer 307
Output electric current IOUT.The set of light modulation request signal instruction on and off switch 1002, light modulation
Second group of action of termination signal instruction on and off switch 1002.Dimming unit 301 is at light modulation request letter
Number the lower value adjusting dim signal SET continuously of effect, stop under the effect of light modulation termination signal
Adjust the value of dim signal SET.In other words, if monitoring first group of on and off switch 1002 and moving
Making, controller 210 adjusts the output electric current I of electric power converter 206 continuouslyOUT；If monitoring electricity
Second group of action of source switch 1002, controller 210 stops adjusting the output of electric power converter 206
Electric current IOUT.In one embodiment, the set of on and off switch 1002 includes that first connects
Logical action.In one embodiment, second group of action of on and off switch 1002 includes first disconnection
Action and second ON Action thereafter.
Assume that initial time on and off switch 1002 disconnects.When on and off switch 1002 is connected by user,
Power converter 206 is powered for light source module 118, and it exports electric current IOUTValue by D/A switch
The initial value of the dim signal SET that device 311 produces determines.On the other hand, when on and off switch 1002
When being connected by user, trigger monitoring means 305 and receive light modulation request signal at port CLK.
In one embodiment, trigger monitoring means 305 receive light modulation request signal show as at port
CLK monitors voltage rising edge 1203 (shown in Fig. 5).In response to light modulation request signal, touch
Send out monitoring means 305 and produce the enable signal EN with high level, thus start timer 307 and open
Beginning timing.In the example in figure 3, the enumerator 309 in timer 307 is in the driving of clock signal
Under start counting up, count value starts to progressively increase to N (N is the integer more than or equal to 1) from 0.
In one embodiment, controller 210 is after receiving light modulation request signal, adjustment output electric current
IOUTOutput electric current I is kept in a preset time period beforeOUTConstant, such as at enumerator 309
Count value reach time period T1 corresponding before N within, D/A converter 311 keeps light modulation letter
Number SET is initial value, keeps output electric current IOUTConstant.In count value from the beginning of N, D/A turns
The value being incremented by increase dim signal SET continuously of the corresponding count value of parallel operation 311.As a result of which it is, it is electric
The output electric current I of force transducer 206OUTAnd the brightness of light source module 118 increases the most accordingly.
Once light source module 118 reaches desired brightness, and user is by executing on and off switch 1002
The brightness adjustment of light source module 118 is terminated with second group of action.Produce under the effect of second group of action
Raw light modulation termination signal.In one embodiment, second group of action include first disconnection action and its
After second ON Action.Trigger monitoring means 305 and receive light modulation termination letter at port CLK
Number.In one embodiment, trigger monitoring means 305 receive light modulation termination signal show as end
Mouth CLK monitors voltage trailing edge 1208 and voltage rising edge thereafter 1210.Terminate in light modulation
Under the effect of signal, trigger monitoring means 305 generation and there is low level enable signal EN, thus
Closing timer 307, enumerator 309 keeps its count value M now constant, D/A converter
311 also answer this to keep the value of dim signal SET constant.As a result of which it is, power converter 206 is defeated
Go out electric current IOUTAnd the brightness of light source module 118 all stops change.
Therefore, within the count value of enumerator 309 is 0 to time period T1 corresponding for N-1, electricity
The output electric current I of force transducer 206OUTKeep initial value constant.Count value from enumerator 309
Within time period T2 corresponding for N to M, the output electric current I of power converter 206OUTContinue
Increasing, the brightness of light source module 118 the most persistently increases.After time period T2, in response to light modulation
Termination signal, the output electric current I of power converter 206OUTAnd the brightness of light source module 118 all quilts
Locking.In one embodiment, N is 1, a length of the 0 of time period T1, then controller 210
Begin to after receiving light modulation request signal adjust output electric current I continuouslyOUT。
When on and off switch 1002 disconnect after a period of time in, controller 210 can by with port
The capacitances to supply power of VDD coupling.In one embodiment, if the second of on and off switch 1002 group is moved
The interval time between first disconnection action and second ON Action thereafter in work exceedes threshold
Value, the count value of enumerator 309 will be reset as 0, the output electricity after second ON Action
Stream IOUTInitial value will be recovered.
The circuit diagram of the current distribution unit 201 that Fig. 6 show in Fig. 2.Fig. 7 show figure
The electric current I of the first light emitting diode chain LED1 in 2LED1With the second light emitting diode chain LED2's
Electric current ILED2Electric current I is exported with power converter 206OUTBetween relation.Fig. 6 will be in conjunction with Fig. 7
It is described.
Current distribution unit 201 includes and light emitting diode chain LED1 and light emitting diode chain LED2
The control unit 641 that couple with monitoring means 645 of monitoring means 645 of coupling and with luminescence two
The current adjustment unit 643 of pole pipe chain LED1 coupling.Monitoring means 645 provides instruction output electric current
IOUTMonitoring signal.Control unit 641 is according to instruction output electric current IOUTMonitoring signal control
Current adjustment unit 643, flows through the electric current I of light emitting diode chain LED1 with regulationLED1.At Fig. 2
With in the example of Fig. 6, monitoring means includes and light emitting diode chain LED1 and light emitting diode chain
The resistance RT of LED2 coupling, instruction output electric current IOUTMonitoring signal VTIt is resistance RT two ends
Voltage.Control unit 641 includes that operational amplifier 507, current adjustment unit 643 include and send out
The second switch (such as transistor Q) of optical diode chain LED1 series connection.Operational amplifier 507
Anode receives reference signal VREF from reference signal generation unit 505, negative terminal by resistance RW with
Resistance RT couples, and outfan couples with transistor Q.Operational amplifier 507 is by controlling crystal
Pipe Q regulates the electric current I flowing through light emitting diode chain LED1LED1.Because flowing through light emitting diode
The electric current I of chain LED2LED2For output electric current IOUTWith the electric current flowing through light emitting diode chain LED1
ILED1Difference, therefore regulation flows through the electric current I of light emitting diode chain LED1LED1Luminescence can be realized
Diode chain LED1, the electric current distribution of LED2, thus correspondingly regulation flows through light emitting diode chain
The electric current I of LED2LED2.In one embodiment, reference signal generation unit 505, operation amplifier
Device 507 and transistor Q are integrated in chip 221.
If on and off switch 1002 is connected, the output electric current I of power converter 206OUTIt flow to light source
Module 118, the initial voltage on port S that chip 221 is connected with resistance RW is less than reference signal
Reference signal VREF that generation unit 505 produces, operational amplifier 507 makes transistor Q complete
Full conducting.For ease of the electric current I of light emitting diode chain LED1 is describedLED1With light emitting diode chain
The electric current I of LED2LED2With output electric current IOUTRelation, it is assumed that output electric current IOUTFrom the beginning of 0
It is gradually increased.In one embodiment, light source driving circuit 200 is configured such that light emitting diode chain
The forward voltage drop of the LED1 forward voltage drop less than light emitting diode chain LED2.When light emitting diode chain
The voltage at LED1 two ends reaches its forward voltage drop, and light emitting diode chain LED1 turns on, now luminous
Diode chain LED2 does not turns on, and electric current flows through light emitting diode chain LED1, resistance RW and resistance
RT is to ground.Flow through the electric current I of light emitting diode chain LED1LED1Along with output electric current IOUTIncrease
And increase, the voltage V on port SSIncrease the most therewith.On the other hand, along with output electric current IOUT
Increase, when the voltage at light emitting diode chain LED2 two ends reaches its forward voltage drop, light emitting diode chain
LED2 is also switched on.As output electric current IOUTIncrease to IT1Time, the voltage V on port SSIncrease to
Close to a value of the voltage of reference signal VREF, transistor Q enters amplification region, operation amplifier
Device 507 starts to regulate linearly flow through the electricity of light emitting diode chain LED1 by controlling transistor Q
Stream ILED1, so that the voltage of 507 two inputs of operational amplifier levels off to equal.
Therefore, under preferable state, when transistor Q works in linear model, on port S
Voltage VSWith the relation of reference signal VREF it is
VS=VREF (1)
Wherein, VREFIt it is the magnitude of voltage of reference signal VREF.
Because flowing through total electric current of light emitting diode chain LED1 and light emitting diode chain LED2 (i.e.
Output electric current IOUT) all flow through resistance RT to ground, the voltage V at resistance RT two endsTCan represent
For
VT=IOUT×RT (2)
Wherein, RTIt it is the resistance of resistance RT.
Resistance RW connects with light emitting diode chain LED1, flows through light emitting diode chain LED1's
Electric current ILED1Can be expressed as
Wherein, RWIt it is the resistance of resistance RW.
Flow through the electric current I of light emitting diode chain LED2LED2Can be expressed as
ILED2=IOUT-ILED1 (4)
Wherein, RWIt it is the resistance of resistance RW.
By equation (3) it can be seen that operational amplifier 507 is according to monitoring signal VTControl transistor
Q flows through the electric current I of light emitting diode chain LED1 with regulationLED1.Can to (4) by equation (1)
To find out, when transistor Q works in linear zone, if output electric current IOUTIncrease, ILED1By
The least, and ILED2It is gradually increased.As output electric current IOUTIncrease to IT2Time, operational amplifier
507 make transistor Q close so that light emitting diode chain LED1 closes, and light emitting diode chain
LED2 remains up.
Looking back Fig. 5, after on and off switch 1002 is connected, in the T2 time period, dimming unit 301 is defeated
The value of the dim signal SET gone out increases over, so that output electric current IOUTIncrease over.
If light emitting diode chain LED1 is warm light, light emitting diode chain LED2 is cold light, then T2 time
Section inner light source module 118 overall brightness increase, its color from warm light to cold light gradually transition.
The circuit diagram of the another kind of embodiment of the controller 210 that Fig. 8 show in Fig. 2.Fig. 8
Similar with Fig. 3, difference is the configuration of dimming unit 301.In the example of fig. 8, dimming unit
301 include triggering monitoring means 805, enumerator 801 and D/A converter 811.Trigger monitoring single
Unit 805 receives the switch monitors signal of the action of instruction on and off switch 1002 by port CLK,
And produce driving signal according to the action of on and off switch 1002.The action of on and off switch 1002 includes connecing
Logical action and disconnection action.Enumerator 801 produces count value under the driving driving signal.D/A
Transducer 811 produces dim signal SET, controller 210 basis according to the count value of enumerator 801
Dim signal SET adjusts output electric current IOUT。
Fig. 9 show the ripple of the light source driving circuit 200 of the configuration that have employed Fig. 8 middle controller 210
Shape figure.Fig. 9 will be described in conjunction with Fig. 8.Assume that initial time on and off switch 1002 disconnects.When
On and off switch 1002 is connected by user, and power converter 206 is powered for light source module 118, its
Output electric current IOUTThe initial value of dim signal SET that produced by D/A converter 811 of value determine.
If user wants to change brightness and/or the color of light source, on and off switch 1002 can be imposed one group
Action.Trigger monitoring means 805 and receive switch monitors signal by port CLK.An enforcement
In example, the set of on and off switch 1002 includes that first disconnection action and thereafter first connect
Logical action, correspondingly, triggering monitoring means 805 receives switch monitors signal and shows as at port
CLK monitors voltage trailing edge 1903 and voltage rising edge thereafter 1905.In this group action
Under effect, trigger monitoring means 805 and produce the count value driving signal CNT to make enumerator 801
Add 1 (such as becoming 1 from 0), the value also phase of the dim signal SET of D/A converter 811 output
The change (such as increasing to the second value from initial value) answered.As a result of which it is, power converter 206
Output electric current IOUTCorresponding change.From figure 7 it can be seen that the brightness of light source module 118 and color are also
Can be with output electric current IOUTTo change.It is similar to, if user is on and off switch 1002 again
Secondary impose set, such as second disconnection action and second ON Action thereafter, trigger prison
Survey unit 805 receives switch monitors signal and shows as monitoring voltage trailing edge at port CLK
1907 and voltage rising edge 1909 thereafter.Under the effect of this group action, trigger monitoring means 805
Produce and drive signal CNT to make the count value of enumerator 801 add 1 (such as becoming 2 from 1), number/
The value of the dim signal SET of weighted-voltage D/A converter 811 output changes the most accordingly and (such as increases from the second value
Greatly to the 3rd value).The color of light source module 118 and brightness also can change the most again.
As it was previously stated, the invention provides a kind of light source driving circuit.The light source of present disclosure drives
Circuit can with traditional on and off switch with the use of.User can utilize traditional metope on and off switch
Regulate brightness and the color of light source, without using special dimmer or remote controller simultaneously.
Embodiment and accompanying drawing are only the conventional embodiment of the present invention specifically above.Obviously, without departing from
Can there is various supplement on the premise of the present invention that claims are defined spirit and invention scope, repair
Change and replace.It should be appreciated by those skilled in the art that the present invention in actual applications can be according to concrete
Environment and job requirement on the premise of without departing substantially from invention criterion form, structure, layout, ratio,
Material, element, assembly and other side are varied from.Therefore, embodiment disclosed here is only used for
Illustrative not limiting, the scope of the present invention is defined by claims and legal equivalents thereof, and not
It is limited to description before this.
Claims (22)
1. a light source driving circuit, it is characterised in that described light source driving circuit includes:
Commutator, from the voltage of power supply and produces commutating voltage for reception；
With the power converter of described rectifier couples, it is used for receiving described commutating voltage and output being provided
Electric current；And
The light source module coupled with described power converter and powered by described output electric current, wherein, institute
State light source module to include:
There is the first light source of the first color；
There is the secondary light source of the second color；And
The current distribution unit coupled with described first light source and described secondary light source, for basis
The regulation of described output electric current flows through the electric current of described first light source and flows through the electric current of described secondary light source.
Light source driving circuit the most according to claim 1, it is characterised in that described light source
Drive circuit also includes:
The controller coupled with described power converter, is connected to described power supply and described light for monitoring
On and off switch between source driving circuit, receives the light modulation of the set indicating described on and off switch
The light modulation termination signal of second group of action of request signal and the described on and off switch of instruction, in described light modulation
Adjust described output electric current under the effect of request signal, stop under the effect of described light modulation termination signal
Adjust described output electric current.
Light source driving circuit the most according to claim 2, it is characterised in that described control
Device keeps described output electric current constant before adjusting described output electric current in a preset time period.
Light source driving circuit the most according to claim 2, it is characterised in that described power supply
The set of switch includes first ON Action, and second group of action of described on and off switch includes
First disconnection action and second ON Action thereafter.
Light source driving circuit the most according to claim 2, it is characterised in that described control
Device includes:
Dimming unit, for producing light modulation according to described light modulation request signal and described light modulation termination signal
Signal, described controller adjusts described output electric current according to described dim signal.
Light source driving circuit the most according to claim 5, it is characterised in that described light modulation
Unit includes:
Trigger monitoring means, be used for receiving described light modulation request signal and described light modulation termination signal and producing
Raw enable signal；
Timer, for timing under the control of described enable signal；And
D/A converter, produces described dim signal for the output according to described timer.
Light source driving circuit the most according to claim 1, it is characterised in that described light source
Drive circuit also includes:
The controller coupled with described power converter, is used for receiving switch monitors signal and according to described
Switch monitors signal adjusts described output electric current, and wherein, described switch monitors signal designation is connected to institute
State the set of on and off switch between power supply and described light source driving circuit.
Light source driving circuit the most according to claim 7, it is characterised in that described power supply
After switch first switches on, described output electric current is the first value, if the switch that described controller receives
The described set of on and off switch described in monitoring signal designation includes first disconnection action and thereafter
Second ON Action, described output electric current is adjusted to from described first value by the most described controller
Two-value.
Light source driving circuit the most according to claim 7, it is characterised in that described control
Device includes:
Dimming unit, for producing dim signal, described controller root according to described switch monitors signal
Described output electric current is adjusted according to described dim signal.
Light source driving circuit the most according to claim 9, it is characterised in that described light modulation
Unit includes:
Trigger monitoring means, be used for receiving described switch monitors signal and producing driving signal；
Enumerator, for counting under the driving of described driving signal；And
D/A converter, produces described dim signal for the count value according to described enumerator.
11. according to the light source driving circuit described in claim 5 or 9, it is characterised in that described
Light source driving circuit also includes:
It is coupled in the energy-storage units between described commutator and described light source module；
The current monitor coupled with described energy-storage units, is used for providing instruction to flow through described energy-storage units
The first signal of transient current；And
The wave filter coupled with described current monitor, for providing instruction stream according to described first signal
Through the secondary signal of the average current of described energy-storage units,
Wherein, described controller is coupled in described commutator and the first of described energy-storage units by control
Switch adjusts described output electric current.
12. light source driving circuits according to claim 11, it is characterised in that described control
Device also includes:
Signal generator, is used for producing sawtooth signal；And
Error amplifier, for producing error signal according to described secondary signal and described dim signal,
Wherein, if the voltage of described sawtooth signal increases to the voltage of described error signal, then institute
State controller and disconnect described first switch.
13. light source driving circuits according to claim 12, it is characterised in that described control
Device also includes:
For producing the reset signal generator of reset signal, described controller is in described reset signal
Effect is lower connects described first switch.
14. light source driving circuits according to claim 1, it is characterised in that
Described first light source is the first light emitting diode chain, and described secondary light source is the second light emitting diode
Chain, and the forward voltage drop of described first light emitting diode chain is less than described second light emitting diode chain just
To pressure drop.
15. light source driving circuits according to claim 1, it is characterised in that described electric current
Allocation unit includes:
The monitoring means coupled with described first light source and described secondary light source, is used for providing instruction described
The monitoring signal of output electric current；
The control unit coupled with described monitoring means；And
With the current adjustment unit of described first light source couples, wherein said control unit is according to described prison
Survey signal and control described current adjustment unit to regulate the electric current flowing through described first light source.
16. light source driving circuits according to claim 15, it is characterised in that described monitoring
Unit includes:
First resistance,
Wherein, the electric current flowing through described first light source and the electric current flowing through described secondary light source all flow through institute
State the first resistance.
17. light source driving circuits according to claim 15, it is characterised in that described control
Unit includes second that operational amplifier, described current adjustment unit include connecting with described first light source
Switch,
Wherein, the first input end of described operational amplifier receives reference signal, described operational amplifier
The second input couple with described monitoring means to receive described monitoring signal, institute by the second resistance
The outfan stating operational amplifier couples with described second switch, and described operational amplifier is by controlling institute
State second switch and regulate the electric current flowing through described first light source.
18. 1 kinds of light source modules, it is characterised in that described light source module includes:
There is the first light source of the first color；
There is the secondary light source of the second color；And
The current distribution unit coupled with described first light source and described secondary light source, for according to described
The input current of light source module regulates and flows through the electric current of described first light source and flow through described second light
The electric current in source.
19. light source modules according to claim 18, it is characterised in that
Described first light source is the first light emitting diode chain, and described secondary light source is the second light emitting diode
Chain, and the forward voltage drop of described first light emitting diode chain is less than described second light emitting diode chain just
To pressure drop.
20. light source modules according to claim 18, it is characterised in that described electric current distributes
Unit includes:
The monitoring means coupled with described first light source and described secondary light source, is used for providing instruction described
The monitoring signal of input current；
The control unit coupled with described monitoring means；And
With the current adjustment unit of described first light source couples, wherein said control unit is according to described prison
Survey signal and control described current adjustment unit to regulate the electric current flowing through described first light source.
21. light source modules according to claim 20, it is characterised in that described monitoring means
Including:
First resistance,
Wherein, the electric current flowing through described first light source and the electric current flowing through described secondary light source all flow through institute
State the first resistance.
22. light source modules according to claim 20, it is characterised in that described control unit
Including operational amplifier, described current adjustment unit includes that connect with described first light source second opens
Close,
Wherein, the first input end of described operational amplifier receives reference signal, described operational amplifier
The second input couple with described monitoring means to receive described monitoring signal, institute by the second resistance
The outfan stating operational amplifier couples with described second switch, and described operational amplifier is by controlling institute
State second switch and regulate the electric current flowing through described first light source.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510082437.9A CN105992437A (en) | 2015-02-13 | 2015-02-13 | Light source drive circuit and light source module |
| TW105103666A TWI612842B (en) | 2015-02-13 | 2016-02-04 | Light source driving circuit and light source module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510082437.9A CN105992437A (en) | 2015-02-13 | 2015-02-13 | Light source drive circuit and light source module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105992437A true CN105992437A (en) | 2016-10-05 |
Family
ID=57042383
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510082437.9A Pending CN105992437A (en) | 2015-02-13 | 2015-02-13 | Light source drive circuit and light source module |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN105992437A (en) |
| TW (1) | TWI612842B (en) |
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Also Published As
| Publication number | Publication date |
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| TW201705813A (en) | 2017-02-01 |
| TWI612842B (en) | 2018-01-21 |
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