CN104010420B - Adjustable color temperature module, the LED drive circuit of adjustable color temperature and system - Google Patents
Adjustable color temperature module, the LED drive circuit of adjustable color temperature and system Download PDFInfo
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- CN104010420B CN104010420B CN201410248427.3A CN201410248427A CN104010420B CN 104010420 B CN104010420 B CN 104010420B CN 201410248427 A CN201410248427 A CN 201410248427A CN 104010420 B CN104010420 B CN 104010420B
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Abstract
The invention provides the LED drive circuit of a kind of adjustable color temperature, power supply signal end or the output voltage signal end of one first sampling unit and LED drive circuit are electrically connected；One partial pressure unit is electrically connected the first sampling unit；One second sampling unit is electrically connected the first sampling unit；The first input end of adjustable color temperature module is electrically connected partial pressure unit by switching the first input end of detection comparator, its second input is electrically connected the second sampling unit by the first input end of timing comparator, its first outfan is electrically connected the LED load negative electrode of color temperature state by the drain electrode of the first MOS transistor, and its second outfan is electrically connected the LED load negative electrode of another colour temperature state by the drain electrode of the second MOS transistor；By controlling being turned on or off of the first MOS transistor and/or the second MOS transistor, and then control conducting and the closedown of the LED load of different-colour state, thus regulating colour temperature。
Description
Technical field
The present invention relates to field of LED drive, particularly relate to a kind of adjustable color temperature module, the LED drive circuit of adjustable color temperature and system。
Background technology
Referring to Fig. 1, the rough schematic view of the LED drive circuit of prior art。As it is shown in figure 1, input AC alternating current power supply 101 is connected to two inputs of rectifier bridge 103；Rectifier bridge 103 will filter through capacitor C1 after AC rectification, produce a DC voltage, resistance R1 and capacitor C2 and produce a low-voltage DC and make driving chip 105 start；Transformator T1 has two to three windings, including a primary side winding, is connected between the drain D RAIN of capacitor C1 and driving chip 105；One vice-side winding, connects between anode and the negative pole of output capacitor C3 of sustained diode 1, and the negative electrode of sustained diode 1 is connected with the anode of output capacitor C3, and load LED is parallel to output capacitor C3 two ends。
Using the LED of above-mentioned LED drive circuit, light is output as a kind of color, is typically color of sunshine or warm white, it is impossible to make LED realize the selection of multiple color temperatures。
Summary of the invention
It is an object of the invention to, for the LED drive circuit Problems existing of adjustable color temperature in prior art, a kind of adjustable color temperature module, the LED drive circuit of adjustable color temperature and system are provided, controlled conducting and the closedown of the LED load of different-colour by adjustable color temperature module, reach the purpose that multiple color temperatures selects。
For achieving the above object, the invention provides a kind of adjustable color temperature module, including: a switch detection comparator, a timing comparator, a state machine, one first MOS transistor and one second MOS transistor；The first input end of described switch detection comparator is an input of described adjustable color temperature module, for receiving one first sampled voltage signal, second input of described switch detection comparator and the outfan of one first reference voltage source are electrically connected, and the outfan of described switch detection comparator is electrically connected the first input end to described state machine；The first input end of described timing comparator is another input of described adjustable color temperature module, for receiving one second sampled voltage signal, second input of described timing comparator and the outfan of one second reference voltage source are electrically connected, and the outfan of described timing comparator is electrically connected the second input to described state machine；First outfan of described state machine is electrically connected the grid to described first MOS transistor, first outfan that drain electrode is described adjustable color temperature module of described first MOS transistor, exports one first voltage control signal to control conducting and the cut out of the LED load of color temperature state for the comparative result according to described switch detection comparator；Second outfan of described state machine is electrically connected the grid to described second MOS transistor, second outfan that drain electrode is described adjustable color temperature module of described second MOS transistor, exports one second voltage control signal to control conducting and the cut out of the LED load of another colour temperature state for the comparative result according to described timing comparator。
For achieving the above object, present invention also offers the LED drive circuit of a kind of adjustable color temperature, including an adjustable color temperature module of the present invention, one first sampling unit, a partial pressure unit and one second sampling unit；Power supply signal end or the output voltage signal end of described first sampling unit and LED drive circuit are electrically connected, and are used for obtaining sampled voltage signal；Described partial pressure unit is electrically connected described first sampling unit, obtains the first sampled voltage signal for described sampled voltage signal is carried out dividing potential drop；Described second sampling unit is electrically connected described first sampling unit, is used for obtaining the second sampled voltage signal；The first input end of described adjustable color temperature module is electrically connected described partial pressure unit by the first input end of described switch detection comparator, second input of described adjustable color temperature module is electrically connected described second sampling unit by the first input end of described timing comparator, first outfan of described adjustable color temperature module is electrically connected the LED load negative electrode of color temperature state by the drain electrode of described first MOS transistor, and the second outfan of described adjustable color temperature module is electrically connected the LED load negative electrode of another colour temperature state by the drain electrode of described second MOS transistor；Comparative result according to described switch detection comparator and described timing comparator controls being turned on or off of described first MOS transistor and/or the second MOS transistor, and then controls conducting and the closedown of the LED load of different-colour state, thus regulating colour temperature。
For achieving the above object, present invention also offers the LED drive system of a kind of adjustable color temperature, including the LED drive circuit of a LED driver, a commutation diode, an output capacitance, the LED load of different-colour state and adjustable color temperature of the present invention；Described LED driver and described commutation diode are electrically connected, and described commutation diode is electrically connected with described output capacitance and each LED load respectively；Described first sampling unit and described commutation diode are electrically connected, and are used for obtaining sampled voltage signal；Described partial pressure unit is electrically connected described first sampling unit, obtains the first sampled voltage signal for described sampled voltage signal is carried out dividing potential drop；Described second sampling unit is electrically connected described first sampling unit, is used for obtaining the second sampled voltage signal；The first input end of described adjustable color temperature module is electrically connected described partial pressure unit by the first input end of described switch detection comparator, second input of described adjustable color temperature module is electrically connected described second sampling unit by the first input end of described timing comparator, first outfan of described adjustable color temperature module is electrically connected the LED load negative electrode of color temperature state by the drain electrode of described first MOS transistor, and the second outfan of described adjustable color temperature module is electrically connected the LED load negative electrode of another colour temperature state by the drain electrode of described second MOS transistor；Comparative result according to described switch detection comparator and described timing comparator controls being turned on or off of described first MOS transistor and/or the second MOS transistor, and then controls conducting and the closedown of the LED load of different-colour state, thus regulating colour temperature。
It is an advantage of the current invention that: controlled conducting and the closedown of the LED load of different-colour by adjustable color temperature module, reach the purpose that colour temperature selects, make the control that LED is switched by common wall, it is possible to achieve the selection of multiple color temperatures。
Accompanying drawing explanation
Fig. 1, the flyback LED drive circuit schematic diagram of prior art；
Fig. 2, the schematic diagram of the LED drive circuit of adjustable color temperature of the present invention；
Fig. 3, the schematic diagram of LED drive system one embodiment of flyback adjustable color temperature of the present invention；
Fig. 4, the circuit work exemplary waveform diagram of the LED drive system of flyback adjustable color temperature of the present invention；
Fig. 5, the schematic diagram of another embodiment of LED drive system of flyback adjustable color temperature of the present invention；
Fig. 6, the schematic diagram of the LED drive system of voltage-dropping type adjustable color temperature of the present invention。
Detailed description of the invention
Elaborate below in conjunction with the accompanying drawing LED drive circuit to adjustable color temperature provided by the invention and system。
First an embodiment of the LED drive circuit of adjustable color temperature of the present invention is provided in conjunction with accompanying drawing 2。
With reference to Fig. 2, the configuration diagram of the LED drive circuit of adjustable color temperature of the present invention, described drive circuit includes: one first sampling unit 21, partial pressure unit 22,1 second sampling unit 23 and an adjustable color temperature module 24。Described adjustable color temperature module 24 includes: a switch detection comparator CP1, a timing comparator CP2, a state machine FSM, one first MOS transistor M1 and one second MOS transistor M2。
Power supply signal end or the output voltage signal end of described first sampling unit 21 and LED drive circuit are electrically connected, and are used for obtaining sampled voltage signal DET。As optional embodiment, described first sampling unit 21 includes the sampling resistor R1 and sampling capacitance C2 of concatenation, the output voltage signal end of described sampling resistor R1 and LED drive circuit is electrically connected the negative electrode of commutation diode (be such as electrically connected in LED drive system), and described sampling capacitance C2 obtains described sampled voltage signal DET by described sampling resistor R1。Or, described first sampling unit 21 includes the sampling resistor R1 of concatenation, sampling diode D2 and sampling capacitance C2；The power supply signal end of described sampling resistor R1 one end and LED drive circuit is electrically connected the anode of commutation diode (be such as electrically connected in LED drive system), the other end of sampling resistor R1 connects the anode of sampling diode D2, the negative electrode of sampling diode D2 connects the other end of sampling capacitance C2, sampling capacitance C2 and connects circuit ground；Described sampling capacitance C2 obtains described sampled voltage signal DET by described sampling diode D2。
Described partial pressure unit 22 is electrically connected described first sampling unit 21, obtains the first sampled voltage signal DET1 for described sampled voltage signal DET is carried out dividing potential drop。Optionally, described partial pressure unit 22 includes the upper divider resistance R2 and lower divider resistance R3 of concatenation, described upper divider resistance R2 one end is coupled between described sampling resistor R1 and sampling capacitance C2 (when described first sampling unit 21 is provided with sampling diode D2, described upper divider resistance R2 one end is coupled between described sampling diode D2 and sampling capacitance C2), the other end is electrically connected with the first input end of described lower divider resistance R3 and described switch detection comparator CP1 respectively。Voltage on sampling capacitance C2 is by obtaining an a low-voltage dc signal i.e. input of the first sampled voltage signal DET1, DET1 input switch detection comparator CP1 after divider resistance R2 and R3 dividing potential drop。When the input switch of LED is closed, the DET voltage that sampling capacitance C2 obtains declines, and the first sampled voltage signal DET1 also begins to decline。Wherein, the input switch of described LED is common wall switch。
Described second sampling unit 23 is electrically connected described first sampling unit 21, is used for obtaining the second sampled voltage signal VCC。Optionally, described second sampling unit 23 includes one for electric diode D3, a timer capacitor C3 and a Zener diode ZD1, described confession electric diode D3 one end is coupled between described sampling resistor R1 and sampling capacitance C2 (when described first sampling unit 21 is provided with sampling diode D2, described confession electric diode D3 one end is coupled between described sampling diode D2 and sampling capacitance C2), the other end and described timer capacitor C3 are electrically connected, and described timer capacitor C3 obtains described second sampled voltage signal VCC by described for electric diode D3；Wherein, the capacitance of the described timer capacitor C3 capacitance more than described sampling capacitance C2；So, when the input switch of LED is closed, the speed that the DET voltage that sampling capacitance C2 obtains declines is more a lot of soon than the speed that the timer capacitor C3 VCC voltage obtained declines。Described Zener diode ZD1 timer capacitor C3 in parallel and described two ends, Zener diode ZD1 limits the maximum of voltage VCC, also limit the maximum of voltage DET simultaneously。
The input that first input end is described adjustable color temperature module 24 of described switch detection comparator CP1, for receiving the first sampled voltage signal DET1, second input of switch detection comparator CP1 and the outfan of one first reference voltage source Ref1 are electrically connected, and the outfan of switch detection comparator CP1 is electrically connected the first input end to described state machine FSM。When the input switch of LED is closed, the output voltage signal of LED drive circuit declines, and the first sampled voltage signal DET1 begins to decline, and the voltage signal of DET1 and the first reference voltage source Ref1 is compared by switch detection comparator CP1；When the first sampled voltage signal DET1 drops to the magnitude of voltage of the first reference voltage source Ref1, switch detection comparator CP1 overturns and outputs signal to state machine FSM。
Another input that first input end is described adjustable color temperature module 24 of described timing comparator CP2, for receiving the second sampled voltage signal VCC, second input of timing comparator CP2 and the outfan of one second reference voltage source Ref2 are electrically connected, and the outfan of timing comparator CP2 is electrically connected the second input to described state machine。When the input switch of LED is closed, the speed that velocity ratio the first sampled voltage signal DET1 that the second sampled voltage signal VCC declines declines is slow；When the second sampled voltage signal VCC is slowly drop down to the magnitude of voltage of the second reference voltage source Ref2, timing comparator CP2 overturns and outputs signal to state machine FSM。
First outfan of described state machine FSM is electrically connected the grid to described first MOS transistor M1, first outfan that drain electrode is described adjustable color temperature module 24 of described first MOS transistor M1；First outfan of described adjustable color temperature module 24 exports one first voltage control signal Drain1 in order to control conducting and the cut out of the LED load LED1 of color temperature state according to the comparative result of described switch detection comparator CP1；Second outfan of described state machine FSM is electrically connected the grid to described second MOS transistor M2, second outfan that drain electrode is described adjustable color temperature module 24 of described second MOS transistor M2；Second outfan of described adjustable color temperature module 24 exports one second voltage control signal Drain2 in order to control conducting and the cut out of the LED load LED2 of another colour temperature state according to the comparative result of described timing comparator CP2。The described state machine FSM comparative result according to described switch detection comparator CP1 and described timing comparator CP2, control being turned on or off of described first MOS transistor M1 and/or the second MOS transistor M2, and then control the conducting of LED load and the closedown of different-colour state, thus realizing regulating colour temperature。Wherein, described LED load refers to the LED lamp bead that output drives, and described LED refers to the whole LED including driving power supply, shell。
As preferred embodiment, described adjustable color temperature module 24 farther includes: an an operational amplifier EA1 and status comparator CP3。One input of described operational amplifier EA1 is electrically connected with the source electrode of a current setting resistance R5 and 1 the tenth MOS transistor M10 respectively, another input of described operational amplifier EA1 and the outfan of one the 3rd reference voltage source Ref3 are electrically connected, and the outfan of described operational amplifier EA1 is electrically connected the grid of described tenth MOS transistor M10。The drain electrode of described tenth MOS transistor M10 is electrically connected the drain electrode of one the 7th MOS transistor M7, and described 7th MOS transistor M7 and one the 8th MOS transistor M8, one the 9th MOS transistor M9 form current mirror。The drain electrode of described 8th MOS transistor M8 is electrically connected one first current source Is1 and one second current source Is2；Described first current source Is1 is electrically connected the drain electrode of one the 3rd MOS transistor M3, described 3rd MOS transistor M3 and one the 5th MOS transistor M5 forms current mirror, and the drain electrode of described 5th MOS transistor M5 is electrically connected the first outfan to described adjustable color temperature module 24；Described second current source Is2 is electrically connected the drain electrode of one the 4th MOS transistor M4, described 4th MOS transistor M4 and one the 6th MOS transistor M6 forms current mirror, and the drain electrode of described 6th MOS transistor M6 is electrically connected the second outfan to described adjustable color temperature module 24。The drain electrode of described 9th MOS transistor M9 is electrically connected with the input of a load current source Is3 and described status comparator CP3 respectively, and the outfan of described status comparator CP3 is electrically connected described state machine FSM。Described state machine FSM is the mode of operation of adjustable color temperature circuit according to the output output control of described status comparator CP3。
Operational amplifier EA1 and MOS transistor M10 forms a closed loop, control the voltage on current setting resistance R5 and make it equal with the voltage of the 3rd reference voltage source Ref3, it is essentially identical that electric current on current setting resistance R5 flows through MOS transistor M10 and MOS transistor M7, the electric current on MOS transistor M8 and M9 and the electric current on current setting resistance R5。Electric current Iset on MOS transistor M8 is used for controlling current source Is1 and Is2, the electric current on Is1 and Is2 and the electric current on current setting resistance R5 is made to be directly proportional, electric current on current source Is1 and Is2 flows through MOS transistor M3 and M4, MOS transistor M5 and M3 is one group of current mirror, MOS transistor M6 and M4 is one group of current mirror, then the electric current on MOS transistor M5 and M6 is directly proportional to the electric current on current setting resistance R5, thereby through the electric current regulated on current setting resistance R5, when can M1 and M2 be closed, the LED current of each LED load is configured, thus realizing night-light function。Electric current on MOS transistor M9 flows through load current source Is3, voltage on load current source Is3 exports to status comparator CP3, status comparator CP3 outputs signal to state machine FSM, the state machine FSM mode of operation of adjustable color temperature circuit according to the output output control of described status comparator CP3。
An embodiment of the LED drive system of adjustable color temperature of the present invention is provided below in conjunction with accompanying drawing 3-4。
With reference to Fig. 3, the schematic diagram of LED drive system one embodiment of flyback adjustable color temperature of the present invention。Described LED drive system includes same components symbol in circuit shown in LED drive circuit 31(and Fig. 2 of a LED driver, a commutation diode D1, an output capacitance C1, the LED load LED1 of different-colour state, LED2 and adjustable color temperature of the present invention and represents same or similar assembly), in present embodiment, described LED driver adopts flyback LED driver, LED load LED1, LED2 colour temperature are different, are generally color of sunshine and warm white。
Flyback LED driver includes the vice-side winding of a transformator T1, transformator T1 and connects commutation diode D1 and circuit ground, and commutation diode D1 connects output capacitance C1 and two paths of LED load LED1, LED2。Flyback LED driver is generally constant-current type output, at the former limit power switch pipe (power MOS pipe for former limit anti exciting converter, not shown) close time, in transformator T1, energy storage is discharged into by commutation diode D1 in output capacitance C1 and LED load, output capacitance C1 stores the energy in HF switch cycle, reduces the current ripples in LED load。
The vice-side winding (being the anode of commutation diode D1) of transformator T1 is simultaneously connected with the sampling resistor R1 of the first sampling unit 21, the other end of sampling resistor R1 connects the anode of a sampling diode D2, the negative electrode of sampling diode D2 connects the other end of sampling capacitance C2, sampling capacitance C2 and connects circuit ground。Sampling resistor R1 and sampling diode D2 series connection, and connect sampling capacitance C2, when flyback LED driver works, sampling resistor R1 is sampling capacitance C2 charging by the diode D2 that samples, and sampling capacitance C2 obtains a DC voltage DET(and sampled voltage signal)。
DET obtains a low-voltage dc signal DET1(i.e. the first sampled voltage signal by divider resistance R2 and the R3 dividing potential drop of partial pressure unit 22), DET1 output extremely switchs an input of detection comparator CP1, another input of switch detection comparator CP1 connects the first reference voltage source Ref1, the outfan connection status machine FSM of switch detection comparator CP1。
Voltage on first sampling unit 21 sampling capacitance C2 is connected to timer capacitor C3 by the electric diode D3 that supplies of the second sampling unit 23, the other end of timer capacitor C3 connects circuit ground, Zener diode ZD1 is parallel to timer capacitor C3 two ends, timer capacitor connects an input of timing comparator CP2, another input of timing comparator CP2 connects the outfan connection status machine FSM of the second reference voltage source Ref2, timing comparator CP2。Sampling capacitance C2, by being timer capacitor C3 charging for electric diode D3, timer capacitor C3 also obtains a DC voltage VCC(i.e. the second sampled voltage signal)。On timer capacitor C3, shunt regulator tube ZD1, ZD1 limit the maximum of DC voltage VCC, also limit the maximum of DC voltage DET simultaneously。
The output of state machine FSM connects the grid of power switch MOS transistor M1 and power switch MOS transistor M2, and the drain electrode of MOS transistor M1 and MOS transistor M2 is connected with the negative electrode of two paths of LED load LED1, LED2 respectively。
When the input switch of LED is closed, flyback LED driver quits work, and without high-frequency impulse on transformator T1 vice-side winding, sampling resistor R1 and sampling diode D2 stops powering for sampling capacitance C2, and DET voltage begins to decline。The midpoint of divider resistance R2 and R3 obtains a signal DET1 being directly proportional with DET voltage, and DET1 and Ref1 is compared by switch detection comparator CP1, and when DET voltage drops to Ref1 value, switch detection comparator CP1 overturns and outputs signal to state machine FSM。The capacitance of the usual sampling capacitance C2 capacitance than timer capacitor C3 is much smaller, so the speed that DET voltage declines is more a lot of soon than the speed that VCC voltage declines, when VCC voltage is slowly drop down to reference voltage Ref2 value, timing comparator CP2 overturns and outputs signal to state machine FSM。State machine FSM, by switching the signal of detection comparator CP1 and timing comparator CP2, controls the turning on and off of power switch MOS transistor M1 and M2, thus whether controlling the conducting of the LED load of two-way different-colour, reaches the purpose that colour temperature selects。Its exemplary operation order is as shown in table 1。
| Switch motion | State | LED1 | LED2 |
| First time start | 1 | Bright | Go out |
| Shutdown quickly start (CP1 overturns, and CP2 does not overturn) | 2 | Go out | Bright |
| Shutdown quickly start (CP1 overturns, and CP2 does not overturn) again | 3 | Bright | Bright |
| Shutdown quickly start (CP1 overturns, and CP2 does not overturn) again | 1 | Bright | Go out |
| Shutdown and start shooting again (CP1, CP2 all overturn) of waiting for a period of time | 1 | Bright | Go out |
The LED drive system one exemplary operation order of table 1 adjustable color temperature of the present invention。
As preferred embodiment, as preferred embodiment, described adjustable color temperature module 24 farther includes: an an operational amplifier EA1 and status comparator CP3, and its circuit connects referring to Fig. 2 and corresponding description thereof。
Operational amplifier EA1 and MOS transistor M10 forms a closed loop, controls the voltage on current setting resistance R5 and makes it equal with the voltage of the 3rd reference voltage source Ref3。Electric current on current setting resistance R5 flows through MOS transistor M10 and MOS transistor M7；MOS transistor M7, M8, M9 form current mirror, so that the electric current on MOS transistor M8 and M9 and the electric current on current setting resistance R5 are essentially identical。Electric current on MOS transistor M8 is used for controlling current source Is1 and Is2, makes the electric current on Is1 and Is2 and the electric current on current setting resistance R5 be directly proportional。Electric current on current source Is1 and Is2 flows through MOS transistor M3 and M4；MOS transistor M5 and M3 is one group of current mirror, and MOS transistor M6 and M4 is one group of current mirror；Then the electric current on MOS transistor M5 and M6 is directly proportional to the electric current on current setting resistance R5；Thereby through the electric current regulated on current setting resistance R5, it is possible to when M1 and M2 closes, the LED current of each LED load is configured, makes LED1 and/or LED2 be in glimmer state, thus realizing the function of night-light。Its exemplary operation order is as shown in table 2。
| Switch motion | State | LED1 | LED2 |
| First time start | 1 | Bright | Go out |
| Shutdown quickly start (CP1 overturns, and CP2 does not overturn) | 2 | Go out | Bright |
| Shutdown quickly start (CP1 overturns, and CP2 does not overturn) again | 3 | Bright | Bright |
| Shutdown quickly start (CP1 overturns, and CP2 does not overturn) again | 4 | Glimmer | Glimmer |
| Shutdown and start shooting again (CP1, CP2 all overturn) of waiting for a period of time | 1 | Bright | Go out |
Another exemplary operation order of the LED drive system of table 2 adjustable color temperature of the present invention。
When not using current setting resistance R5, voltage on load current source Is3 is relatively low, status comparator CP3 outputs signal to state machine FSM, when input line LED being detected switchs perseveration, state machine FSM will not enter the 4th state (glimmer), and directly periodic duty in the 1st to the 3rd state, as shown in table 1。
Fig. 4 is the circuit work exemplary waveform diagram of the LED drive system of the adjustable color temperature of flyback of the present invention, and job order shown in corresponding table 2, when Drain1 or Drain2 voltage is high, represents corresponding LED load lamp and goes out。
When first time starts shooting, DET voltage follow VCC voltage slowly rises, and now enters state 1:LED1 bright, and LED2 goes out；After shutdown, VCC voltage slowly declines, and DET voltage declines rapidly, after DET voltage drops to the upset threshold values of CP1, again starts shooting, and DET voltage and VCC voltage rise to the clamp voltage of ZD1, now enters state 2:LED1 and goes out, and LED2 is bright；When again shutting down and quickly start shooting, enter state 3:LED1 and LED2 and light simultaneously；When again shutting down and quickly start shooting, entering state 4:LED1 and LED2 glimmer simultaneously, electric current and the resistance of current setting resistance R5 in LED1 and LED2 are directly proportional。If shutdown keeps certain time, after waiting the upset threshold values that VCC voltage drops to CP2, again starting shooting, it is bright that system resets to state 1:LED1, and LED2 goes out。
The present invention, by detecting opening and closedown of LED input line switch, controls conducting and the closedown of the LED load of two-way different-colour, reaches the purpose that colour temperature selects。Described above being only an exemplary embodiments, each state of LED and its job order all can be adapted to different application。
The LED drive system of adjustable color temperature of the present invention can also be passed through output voltage detection and carry out colour temperature adjustment。With reference to Fig. 5, the schematic diagram of another embodiment of LED drive system of flyback adjustable color temperature of the present invention。It is different in that with Fig. 3 illustrated embodiment, described first sampling unit 21 includes the sampling resistor R1 and sampling capacitance C2 that only include concatenation, the negative electrode of commutation diode D1 connects the sampling resistor R1 of the first sampling unit 21, described sampling capacitance C2 obtains described sampled voltage signal DET by described sampling resistor R1, namely detection and power supply signal end adopt output voltage signal VOUT to provide。LED drive circuit 41 driving method of its adjustable color temperature is similar with controlling logical AND Fig. 3 illustrated embodiment, does not repeat them here。
The LED drive circuit of adjustable color temperature of the present invention can be applied equally in non-isolated voltage-dropping type structure。With reference to Fig. 6, the schematic diagram of the LED drive system of voltage-dropping type adjustable color temperature of the present invention。Wherein, the driving principle of the LED drive circuit of adjustable color temperature is similar with controlling logical AND Fig. 3 illustrated embodiment, does not repeat them here。
The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from the principles of the invention; can also making some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention。
Claims (10)
1. an adjustable color temperature module, it is characterised in that including: a switch detection comparator, a timing comparator, a state machine, one first MOS transistor and one second MOS transistor；
The first input end of described switch detection comparator is an input of described adjustable color temperature module, for receiving one first sampled voltage signal, second input of described switch detection comparator and the outfan of one first reference voltage source are electrically connected, and the outfan of described switch detection comparator is electrically connected the first input end to described state machine；
The first input end of described timing comparator is another input of described adjustable color temperature module, for receiving one second sampled voltage signal, second input of described timing comparator and the outfan of one second reference voltage source are electrically connected, and the outfan of described timing comparator is electrically connected the second input to described state machine；
First outfan of described state machine is electrically connected the grid to described first MOS transistor, first outfan that drain electrode is described adjustable color temperature module of described first MOS transistor, exports one first voltage control signal to control conducting and the cut out of the LED load of color temperature state for the comparative result according to described switch detection comparator；
Second outfan of described state machine is electrically connected the grid to described second MOS transistor, second outfan that drain electrode is described adjustable color temperature module of described second MOS transistor, exports one second voltage control signal to control conducting and the cut out of the LED load of another colour temperature state for the comparative result according to described timing comparator。
2. adjustable color temperature module according to claim 1, it is characterised in that described adjustable color temperature module farther includes a: operational amplifier and a status comparator；One input of described operational amplifier is electrically connected with the source electrode of a current setting resistance and 1 the tenth MOS transistor respectively, another input of described operational amplifier and the outfan of one the 3rd reference voltage source are electrically connected, and the outfan of described operational amplifier is electrically connected the grid of described tenth MOS transistor；The drain electrode of described tenth MOS transistor is electrically connected the drain electrode of one the 7th MOS transistor, described 7th MOS transistor and one the 8th MOS transistor, one the 9th MOS transistor composition current mirror；The drain electrode of described 8th MOS transistor is electrically connected one first current source and one second current source, described first current source is electrically connected the drain electrode of one the 3rd MOS transistor, described 3rd MOS transistor and one the 5th MOS transistor composition current mirror, the drain electrode of described 5th MOS transistor is electrically connected the first outfan to described adjustable color temperature module, described second current source is electrically connected the drain electrode of one the 4th MOS transistor, described 4th MOS transistor and one the 6th MOS transistor composition current mirror, the drain electrode of described 6th MOS transistor is electrically connected the second outfan to described adjustable color temperature module；The drain electrode of described 9th MOS transistor is electrically connected with the input of a load current source and described status comparator respectively, and the outfan of described status comparator is electrically connected described state machine。
3. the LED drive circuit of an adjustable color temperature, it is characterised in that include the adjustable color temperature module described in a claim 1, one first sampling unit, a partial pressure unit and one second sampling unit；
Power supply signal end or the output voltage signal end of described first sampling unit and LED drive circuit are electrically connected, and are used for obtaining sampled voltage signal；Described partial pressure unit is electrically connected described first sampling unit, obtains the first sampled voltage signal for described sampled voltage signal is carried out dividing potential drop；Described second sampling unit is electrically connected described first sampling unit, is used for obtaining the second sampled voltage signal；The first input end of described adjustable color temperature module is electrically connected described partial pressure unit by the first input end of described switch detection comparator, second input of described adjustable color temperature module is electrically connected described second sampling unit by the first input end of described timing comparator, first outfan of described adjustable color temperature module is electrically connected the LED load negative electrode of color temperature state by the drain electrode of described first MOS transistor, and the second outfan of described adjustable color temperature module is electrically connected the LED load negative electrode of another colour temperature state by the drain electrode of described second MOS transistor；Comparative result according to described switch detection comparator and described timing comparator controls being turned on or off of described first MOS transistor and/or the second MOS transistor, and then controls conducting and the closedown of the LED load of different-colour state, thus regulating colour temperature。
4. the LED drive circuit of adjustable color temperature according to claim 3, it is characterized in that, described first sampling unit includes sampling resistor and the sampling capacitance of concatenation, the output voltage signal end of described sampling resistor and LED drive circuit is electrically connected, and described sampling capacitance obtains described sampled voltage signal by described sampling resistor；Described partial pressure unit includes the upper divider resistance of concatenation and lower divider resistance, described upper divider resistance one end is coupled between described sampling resistor and sampling capacitance, and the other end is electrically connected with the first input end of described lower divider resistance and described switch detection comparator respectively；Described second sampling unit includes one for electric diode, a timer capacitor and a Zener diode, described confession electric diode one end is coupled between described sampling resistor and sampling capacitance, the other end and described timer capacitor are electrically connected, described timer capacitor obtains described second sampled voltage signal by described for electric diode, described Zener diode timer capacitor two ends in parallel and described, wherein, the capacitance of described timer capacitor is more than the capacitance of described sampling capacitance。
5. the LED drive circuit of adjustable color temperature according to claim 3, it is characterized in that, described first sampling unit includes the sampling resistor of concatenation, sampling diode and sampling capacitance, the power supply signal end of described sampling resistor and LED drive circuit is electrically connected, and described sampling capacitance obtains described sampled voltage signal by described sampling diode；Described partial pressure unit includes the upper divider resistance of concatenation and lower divider resistance, described upper divider resistance one end is coupled between described sampling diode and sampling capacitance, and the other end is electrically connected with the first input end of described lower divider resistance and described switch detection comparator respectively；Described second sampling unit includes one for electric diode, a timer capacitor and a Zener diode, described confession electric diode one end is coupled between described sampling resistor and sampling capacitance, the other end and described timer capacitor are electrically connected, described timer capacitor obtains described second sampled voltage signal by described for electric diode, described Zener diode is parallel to described timer capacitor two ends, wherein, the capacitance of described timer capacitor is more than the capacitance of described sampling capacitance。
6. the LED drive circuit of adjustable color temperature according to claim 3, it is characterised in that described adjustable color temperature module farther includes a: operational amplifier and a status comparator；One input of described operational amplifier is electrically connected with the source electrode of a current setting resistance and 1 the tenth MOS transistor respectively, another input of described operational amplifier and the outfan of one the 3rd reference voltage source are electrically connected, and the outfan of described operational amplifier is electrically connected the grid of described tenth MOS transistor；The drain electrode of described tenth MOS transistor is electrically connected the drain electrode of one the 7th MOS transistor, described 7th MOS transistor and one the 8th MOS transistor, one the 9th MOS transistor composition current mirror；The drain electrode of described 8th MOS transistor is electrically connected one first current source and one second current source, described first current source is electrically connected the drain electrode of one the 3rd MOS transistor, described 3rd MOS transistor and one the 5th MOS transistor composition current mirror, the drain electrode of described 5th MOS transistor is electrically connected the first outfan to described adjustable color temperature module, in order to control the electric current of the LED load of described color temperature state, described second current source is electrically connected the drain electrode of one the 4th MOS transistor, described 4th MOS transistor and one the 6th MOS transistor composition current mirror, the drain electrode of described 6th MOS transistor is electrically connected the second outfan to described adjustable color temperature module, in order to control the electric current of the LED load of another colour temperature state described；The drain electrode of described 9th MOS transistor is electrically connected with the input of a load current source and described status comparator respectively, and the outfan of described status comparator is electrically connected described state machine。
7. a LED drive system for adjustable color temperature, including the LED load of a LED driver, a commutation diode, an output capacitance and different-colour state, it is characterised in that farther include the LED drive circuit of adjustable color temperature described in claim 3；
Described LED driver and described commutation diode are electrically connected, and described commutation diode is electrically connected with described output capacitance and each LED load respectively；Described first sampling unit and described commutation diode are electrically connected, and are used for obtaining sampled voltage signal；Described partial pressure unit is electrically connected described first sampling unit, obtains the first sampled voltage signal for described sampled voltage signal is carried out dividing potential drop；Described second sampling unit is electrically connected described first sampling unit, is used for obtaining the second sampled voltage signal；The first input end of described adjustable color temperature module is electrically connected described partial pressure unit by the first input end of described switch detection comparator, second input of described adjustable color temperature module is electrically connected described second sampling unit by the first input end of described timing comparator, first outfan of described adjustable color temperature module is electrically connected the LED load negative electrode of color temperature state by the drain electrode of described first MOS transistor, and the second outfan of described adjustable color temperature module is electrically connected the LED load negative electrode of another colour temperature state by the drain electrode of described second MOS transistor；Comparative result according to described switch detection comparator and described timing comparator controls being turned on or off of described first MOS transistor and/or the second MOS transistor, and then controls conducting and the closedown of the LED load of different-colour state, thus regulating colour temperature。
8. the LED drive system of adjustable color temperature according to claim 7, it is characterized in that, described first sampling unit includes sampling resistor and the sampling capacitance of concatenation, the negative electrode of described sampling resistor and described commutation diode is electrically connected, and described sampling capacitance obtains described sampled voltage signal by described sampling resistor；Described partial pressure unit includes the upper divider resistance of concatenation and lower divider resistance, described upper divider resistance one end is coupled between described sampling resistor and sampling capacitance, and the other end is electrically connected with the first input end of described lower divider resistance and described switch detection comparator respectively；Described second sampling unit includes one for electric diode, a timer capacitor and a Zener diode, described confession electric diode one end is coupled between described sampling resistor and sampling capacitance, the other end and described timer capacitor are electrically connected, described timer capacitor obtains described second sampled voltage signal by described for electric diode, described Zener diode timer capacitor two ends in parallel and described, wherein, the capacitance of described timer capacitor is more than the capacitance of described sampling capacitance。
9. the LED drive system of adjustable color temperature according to claim 7, it is characterized in that, described first sampling unit includes the sampling resistor of concatenation, sampling diode and sampling capacitance, the power supply signal end of described sampling resistor and LED drive circuit is electrically connected, and described sampling capacitance obtains described sampled voltage signal by described sampling diode；Described partial pressure unit includes the upper divider resistance of concatenation and lower divider resistance, described upper divider resistance one end is coupled between described sampling diode and sampling capacitance, and the other end is electrically connected with the first input end of described lower divider resistance and described switch detection comparator respectively；Described second sampling unit includes one for electric diode, a timer capacitor and a Zener diode, described confession electric diode one end is coupled between described sampling resistor and sampling capacitance, the other end and described timer capacitor are electrically connected, described timer capacitor obtains described second sampled voltage signal by described for electric diode, described Zener diode is parallel to described timer capacitor two ends, wherein, the capacitance of described timer capacitor is more than the capacitance of described sampling capacitance。
10. the LED drive system of adjustable color temperature according to claim 7, it is characterised in that described adjustable color temperature module farther includes a: operational amplifier and a status comparator；One input of described operational amplifier is electrically connected with the source electrode of a current setting resistance and 1 the tenth MOS transistor respectively, another input of described operational amplifier and the outfan of one the 3rd reference voltage source are electrically connected, and the outfan of described operational amplifier is electrically connected the grid of described tenth MOS transistor；The drain electrode of described tenth MOS transistor is electrically connected the drain electrode of one the 7th MOS transistor, described 7th MOS transistor and one the 8th MOS transistor, one the 9th MOS transistor composition current mirror；The drain electrode of described 8th MOS transistor is electrically connected one first current source and one second current source, described first current source is electrically connected the drain electrode of one the 3rd MOS transistor, described 3rd MOS transistor and one the 5th MOS transistor composition current mirror, the drain electrode of described 5th MOS transistor is electrically connected the first outfan to described adjustable color temperature module, described second current source is electrically connected the drain electrode of one the 4th MOS transistor, described 4th MOS transistor and one the 6th MOS transistor composition current mirror, the drain electrode of described 6th MOS transistor is electrically connected the second outfan to described adjustable color temperature module；The drain electrode of described 9th MOS transistor is electrically connected with the input of a load current source and described status comparator respectively, and the outfan of described status comparator is electrically connected described state machine。
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| CN106304518B (en) * | 2015-05-13 | 2019-04-16 | 华润矽威科技（上海）有限公司 | A kind of control circuit and method adjusting LED colour temperature or brightness |
| CN110557003A (en) * | 2018-06-01 | 2019-12-10 | 宏碁股份有限公司 | Power supply conversion device |
| CN111083840A (en) * | 2019-12-25 | 2020-04-28 | 深圳市芯飞凌半导体有限公司 | LED drive circuit with color-adjusting switch |
| US11864290B1 (en) | 2022-01-24 | 2024-01-02 | Wangs Alliance Corporation | Dim-to-warm lighting |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102200247A (en) * | 2010-03-24 | 2011-09-28 | 富准精密工业(深圳)有限公司 | Light emitting diode lamp |
| CN202210893U (en) * | 2011-09-28 | 2012-05-02 | 许瑞清 | Linear constant-current controller, chip, and drive device |
| CN102917494A (en) * | 2012-09-29 | 2013-02-06 | 彩虹集团公司 | Two-dimensional color temperature regulating device of LED lamps |
| WO2013107894A1 (en) * | 2012-01-20 | 2013-07-25 | Osram Gmbh | Optoelectronic component device |
| CN203951650U (en) * | 2014-06-06 | 2014-11-19 | 上海晶丰明源半导体有限公司 | The LED drive circuit of adjustable color temperature module, adjustable color temperature and system |
-
2014
- 2014-06-06 CN CN201410248427.3A patent/CN104010420B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102200247A (en) * | 2010-03-24 | 2011-09-28 | 富准精密工业(深圳)有限公司 | Light emitting diode lamp |
| CN202210893U (en) * | 2011-09-28 | 2012-05-02 | 许瑞清 | Linear constant-current controller, chip, and drive device |
| WO2013107894A1 (en) * | 2012-01-20 | 2013-07-25 | Osram Gmbh | Optoelectronic component device |
| CN102917494A (en) * | 2012-09-29 | 2013-02-06 | 彩虹集团公司 | Two-dimensional color temperature regulating device of LED lamps |
| CN203951650U (en) * | 2014-06-06 | 2014-11-19 | 上海晶丰明源半导体有限公司 | The LED drive circuit of adjustable color temperature module, adjustable color temperature and system |
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