CN104010420A - Color-temperature-adjustable module and color-temperature-adjustable LED driving circuit and system - Google Patents
Color-temperature-adjustable module and color-temperature-adjustable LED driving circuit and system Download PDFInfo
- Publication number
- CN104010420A CN104010420A CN201410248427.3A CN201410248427A CN104010420A CN 104010420 A CN104010420 A CN 104010420A CN 201410248427 A CN201410248427 A CN 201410248427A CN 104010420 A CN104010420 A CN 104010420A
- Authority
- CN
- China
- Prior art keywords
- mos transistor
- electricity
- sampling
- color temperature
- adjustable color
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention provides a color-temperature-adjustable LED driving circuit. A first sampling unit is electrically connected with the power supply signal end or the output voltage signal end of the LED driving circuit; a voltage-dividing unit is electrically connected with the first sampling unit; a second sampling unit is electrically connected with the first sampling unit; the first input end of a color-temperature-adjustable module is electrically connected with the voltage-dividing unit through the first input end of a switch detection comparator, the second input end of the color-temperature-adjustable module is electrically connected with the second sampling unit through the first input end of a timing comparator, the first output end of the color-temperature-adjustable module is electrically connected with the cathode of an LED load in one color-temperature state through the drain of a first MOS transistor, and the second output end of the color-temperature-adjustable module is electrically connected with the cathode of an LED load in another color-temperature state through the drain of a second MOS transistor; the first MOS transistor and/or the second MOS transistor are/is controlled to be connected or disconnected to further control the LED loads in the different color-temperature states to be connected and disconnected, and the color temperature is accordingly adjusted.
Description
Technical field
The present invention relates to LED and drive field, relate in particular to LED drive circuit and the system of a kind of adjustable color temperature module, adjustable color temperature.
Background technology
Referring to Fig. 1, the rough schematic view of the LED drive circuit of prior art.As shown in Figure 1, input AC AC power 101 is connected to two inputs of rectifier bridge 103; Rectifier bridge 103 by capacitor C1 filtering, produces a direct voltage by AC rectification, and resistance R 1 and capacitor C2 produce a low-voltage DC makes to drive chip 105 to start; Transformer T1 has two to three windings, comprises a former limit winding, is connected in capacitor C1 and drives between the drain D RAIN of chip 105; A secondary winding, connects between the anode of sustained diode 1 and the negative pole of output capacitor C3, 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.
The LED lamp that uses above-mentioned LED drive circuit, light is output as a kind of color, is typically color of sunshine or warm white, cannot make LED lamp realize the selection of multiple color temperatures.
Summary of the invention
The object of the invention is to, the problem existing for the LED drive circuit of adjustable color temperature in prior art, LED drive circuit and the system of a kind of adjustable color temperature module, adjustable color temperature are provided, the conducting of the LED load by adjustable color temperature module controls different-colour with close, reach the object that multiple color temperatures is selected.
For achieving the above object, the invention provides a kind of adjustable color temperature module, comprising: 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, be used for receiving one first sampled voltage signal, the second input of described switch detection comparator is connected with the output electricity of one first reference voltage source, and the output electricity of described switch detection comparator is connected to the first input end of described state machine; The first input end of described timing comparator is another input of described adjustable color temperature module, be used for receiving one second sampled voltage signal, the second input of described timing comparator is connected with the output electricity of one second reference voltage source, and the output electricity of described timing comparator is connected to the second input of described state machine; The first output electricity of described state machine is connected to the grid of described the first MOS transistor, the drain electrode of described the first MOS transistor is the first output of described adjustable color temperature module, for according to comparative result output one first voltage control signal of described switch detection comparator with control temperature state of the same colour LED load conducting with close; The second output electricity of described state machine is connected to the grid of described the second MOS transistor, the drain electrode of described the second MOS transistor is the second output of described adjustable color temperature module, for according to the comparative result of described timing comparator, export a second voltage control signal with control another colour temperature state LED load conducting with close.
For achieving the above object, the present invention also provides a kind of LED drive circuit of adjustable color temperature, comprises an adjustable color temperature module of the present invention, one first sampling unit, a partial pressure unit and one second sampling unit; Described the first sampling unit is connected with power supply signal end or the output voltage signal end electricity of LED drive circuit, for obtaining sampled voltage signal; Described partial pressure unit electricity connects described the first sampling unit, for described sampled voltage signal is carried out to dividing potential drop, obtains the first sampled voltage signal; Described the second sampling unit electricity connects described the first sampling unit, for obtaining the second sampled voltage signal; The first input end of described adjustable color temperature module connects described partial pressure unit by the first input end electricity of described switch detection comparator, the second input of described adjustable color temperature module connects described the second sampling unit by the first input end electricity of described timing comparator, the first output of described adjustable color temperature module connects the LED load negative electrode of temperature state of the same colour by the drain electrode electricity of described the first MOS transistor, the second output of described adjustable color temperature module connects the LED load negative electrode of another colour temperature state by the drain electrode electricity of described the second MOS transistor; According to the comparative result of described switch detection comparator and described timing comparator, control conducting or the disconnection of described the first MOS transistor and/or the second MOS transistor, so control different-colour state LED load conducting with close, thereby regulate colour temperature.
For achieving the above object, the present invention also provides a kind of LED drive system of adjustable color temperature, comprises the LED load of a LED driver, a rectifier diode, an output capacitance, different-colour state and the LED drive circuit of adjustable color temperature of the present invention; Described LED driver is connected with described rectifier diode electricity, and described rectifier diode is connected with described output capacitance and each LED load electricity respectively; Described the first sampling unit is connected with described rectifier diode electricity, for obtaining sampled voltage signal; Described partial pressure unit electricity connects described the first sampling unit, for described sampled voltage signal is carried out to dividing potential drop, obtains the first sampled voltage signal; Described the second sampling unit electricity connects described the first sampling unit, for obtaining the second sampled voltage signal; The first input end of described adjustable color temperature module connects described partial pressure unit by the first input end electricity of described switch detection comparator, the second input of described adjustable color temperature module connects described the second sampling unit by the first input end electricity of described timing comparator, the first output of described adjustable color temperature module connects the LED load negative electrode of temperature state of the same colour by the drain electrode electricity of described the first MOS transistor, the second output of described adjustable color temperature module connects the LED load negative electrode of another colour temperature state by the drain electrode electricity of described the second MOS transistor; According to the comparative result of described switch detection comparator and described timing comparator, control conducting or the disconnection of described the first MOS transistor and/or the second MOS transistor, so control different-colour state LED load conducting with close, thereby regulate colour temperature.
The invention has the advantages that: the conducting of the LED load by adjustable color temperature module controls different-colour with close, reach the object that colour temperature is selected, make LED lamp by the control of common wall switch, can realize 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 LED drivetrain of flyback adjustable color temperature of the present invention is unified the schematic diagram of execution mode;
Fig. 4, the circuit working typical waveform figure of the LED drive system of flyback adjustable color temperature of the present invention;
Fig. 5, the schematic diagram of another execution mode 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.
Embodiment
Below in conjunction with accompanying drawing, the LED drive circuit of adjustable color temperature provided by the invention and system are elaborated.
First by reference to the accompanying drawings 2 execution modes that provide the LED drive circuit of adjustable color temperature of the present invention.
With reference to figure 2, the configuration diagram of the LED drive circuit of adjustable color temperature of the present invention, described drive circuit comprises: one first sampling unit 21, a partial pressure unit 22, one second sampling unit 23 and an adjustable color temperature module 24.Described adjustable color temperature module 24 comprises: a switch detection comparator CP1, a timing comparator C P2, a state machine FSM, one first MOS transistor M1 and one second MOS transistor M2.
Described the first sampling unit 21 is connected with power supply signal end or the output voltage signal end electricity of LED drive circuit, for obtaining sampled voltage signal DET.As optional execution mode, described the first sampling unit 21 comprises sampling resistor R1 and the sampling capacitance C2 of serial connection, described sampling resistor R1 is connected (negative electrode that for example electricity connects rectifier diode in LED drive system) with the output voltage signal end electricity of LED drive circuit, described sampling capacitance C2 obtains described sampled voltage signal DET by described sampling resistor R1.Or described the first sampling unit 21 comprises sampling resistor R1, sampling diode D2 and the sampling capacitance C2 of serial connection; Described sampling resistor R1 one end is connected (anode that for example electricity connects rectifier diode in LED drive system) with the power supply signal end electricity of LED drive circuit, the other end of sampling resistor R1 connects the anode of sampling diode D2, the negative electrode of sampling diode D2 connects sampling capacitance C2, the other end connecting circuit ground of sampling capacitance C2; Described sampling capacitance C2 obtains described sampled voltage signal DET by described sampling diode D2.
Described partial pressure unit 22 electricity connect described the first sampling unit 21, for described sampled voltage signal DET is carried out to dividing potential drop, obtain the first sampled voltage signal DET1.Optionally, described partial pressure unit 22 comprises upper divider resistance R2 and the lower divider resistance R3 of serial connection, described upper divider resistance R2 one end is coupled between described sampling resistor R1 and sampling capacitance C2 (when described the 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 connected with the first input end electricity of described lower divider resistance R3 and described switch detection comparator CP1 respectively.Voltage on sampling capacitance C2 obtains i.e. the first sampled voltage signal DET1 of a low-voltage dc signal, an input of DET1 input switch detection comparator CP1 after by divider resistance R2 and R3 dividing potential drop.When the input switch of LED lamp is closed, the DET voltage drop that sampling capacitance C2 obtains, the first sampled voltage signal DET1 also starts to decline.Wherein, the input switch of described LED lamp is common wall switch.
Described the second sampling unit 23 electricity connect described the first sampling unit 21, for obtaining the second sampled voltage signal VCC.Optionally, described the second sampling unit 23 comprises that one for electric diode D3, a timing capacitor C 3 and a voltage stabilizing didoe ZD1, describedly for electric diode D3 one end, be coupled between described sampling resistor R1 and sampling capacitance C2 (when described the first sampling unit 21 is provided with sampling diode D2, the described electric diode D3 one end that supplies is coupled between described sampling diode D2 and sampling capacitance C2), the other end is connected with described timing capacitor C 3 electricity, and described timing capacitor C 3 is obtained described the second sampled voltage signal VCC by described for electric diode D3; Wherein, the capacitance of described timing capacitor C 3 is greater than the capacitance of described sampling capacitance C2; Like this, when the input switch of LED lamp is closed, the speed of the VCC voltage drop that the speed of the DET voltage drop that sampling capacitance C2 obtains obtains than timing capacitor C 3 is a lot of soon.Described voltage stabilizing didoe ZD1 parallel connection and described timing capacitor C 3 two ends, voltage stabilizing didoe ZD1 has limited the maximum of voltage VCC, has also limited the maximum of voltage DET simultaneously.
The first input end of described switch detection comparator CP1 is an input of described adjustable color temperature module 24, be used for receiving the first sampled voltage signal DET1, the second input of switch detection comparator CP1 is connected with the output electricity of one first reference voltage source Ref1, and the output electricity of switch detection comparator CP1 is connected to the first input end of described state machine FSM.When the input switch of LED lamp is closed, the output voltage signal of LED drive circuit declines, and the first sampled voltage signal DET1 starts to decline, and switch detection comparator CP1 compares DET1 with the voltage signal of the first reference voltage source Ref1; 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.
The first input end of described timing comparator C P2 is another input of described adjustable color temperature module 24, be used for receiving the second sampled voltage signal VCC, the second input of timing comparator C P2 is connected with the output electricity of one second reference voltage source Ref2, and the output electricity of timing comparator C P2 is connected to the second input of described state machine.When the input switch of LED lamp is closed, the speed that speed ratio the first sampled voltage signal DET1 that the second sampled voltage signal VCC declines declines is slow; When the magnitude of voltage of the second sampled voltage signal VCC slow decreasing to the second reference voltage source Ref2, timing comparator C P2 upset and output signal to state machine FSM.
The first output electricity of described state machine FSM is connected to the grid of described the first MOS transistor M1, and the drain electrode of described the first MOS transistor M1 is the first output of described adjustable color temperature module 24; The first output of described adjustable color temperature module 24 according to the comparative result output one first voltage control signal Drain1 of described switch detection comparator CP1 in order to control temperature state of the same colour LED load LED1 conducting with close; The second output electricity of described state machine FSM is connected to the grid of described the second MOS transistor M2, and the drain electrode of described the second MOS transistor M2 is the second output of described adjustable color temperature module 24; The second output of described adjustable color temperature module 24 according to the comparative result of described timing comparator C P2 export a second voltage control signal Drain2 in order to control another colour temperature state LED load LED2 conducting with close.Described state machine FSM is according to the comparative result of described switch detection comparator CP1 and described timing comparator C P2, control conducting or the disconnection of described the first MOS transistor M1 and/or the second MOS transistor M2, and then control different-colour state LED load conducting with close, thereby realize, regulate colour temperature.Wherein, described LED load refers to the LED lamp pearl that output drives, and described LED lamp refers to the whole LED lamp that comprises driving power, shell.
As preferred embodiment, described adjustable color temperature module 24 further comprises: an operational amplifier EA1 and a status comparator CP3.An input of described operational amplifier EA1 is connected with the source electrode electricity of a current setting resistance R5 and 1 the tenth MOS transistor M10 respectively, another input of described operational amplifier EA1 is connected with the output electricity of one the 3rd reference voltage source Ref3, and the output electricity of described operational amplifier EA1 connects the grid of described the tenth MOS transistor M10.The drain electrode electricity of described the tenth MOS transistor M10 connects the drain electrode of one the 7th MOS transistor M7, and described the 7th MOS transistor M7 and one the 8th MOS transistor M8, one the 9th MOS transistor M9 form current mirror.The drain electrode electricity of described the 8th MOS transistor M8 connects one first current source Is1 and one second current source Is2; Described the first current source Is1 is electrically connected the drain electrode of one the 3rd MOS transistor M3, described the 3rd MOS transistor M3 and one the 5th MOS transistor M5 form current mirror, and the drain electrode electricity of described the 5th MOS transistor M5 is connected to the first output of described adjustable color temperature module 24; Described the second current source Is2 is electrically connected the drain electrode of one the 4th MOS transistor M4, described the 4th MOS transistor M4 and one the 6th MOS transistor M6 form current mirror, and the drain electrode electricity of described the 6th MOS transistor M6 is connected to the second output of described adjustable color temperature module 24.The drain electrode of described the 9th MOS transistor M9 is connected with the input electricity of a load current source Is3 and described status comparator CP3 respectively, and the output electricity of described status comparator CP3 connects described state machine FSM.Described state machine FSM controls the mode of operation of described adjustable color temperature circuit according to the Output rusults of described status comparator CP3.
Operational amplifier EA1 and MOS transistor M10 form 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, electric current on current setting resistance R5 flow through MOS transistor M10 and MOS transistor M7, the electric current on the electric current on MOS transistor M8 and M9 and current setting resistance R5 is basic identical.Electric current I set on MOS transistor M8 is used for controlling current source Is1 and Is2, electric current on Is1 and Is2 and the electric current on current setting resistance R5 are directly proportional, electric current on current source Is1 and Is2 flow through MOS transistor M3 and M4, MOS transistor M5 and M3 are one group of current mirror, MOS transistor M6 and M4 are one group of current mirror, the electric current on MOS transistor M5 and M6 is directly proportional to the electric current on current setting resistance R5, thereby by regulating the electric current on current setting resistance R5, in the time of can closing M1 and M2, the LED electric current of each LED load arranges, thereby realize night-light function.Electric current on the MOS transistor M9 load current source Is3 that flows through, Voltage-output on load current source Is3 is to status comparator CP3, status comparator CP3 outputs signal to state machine FSM, and state machine FSM controls the mode of operation of described adjustable color temperature circuit according to the Output rusults of described status comparator CP3.
Below in conjunction with accompanying drawing 3-4, provide an execution mode of the LED drive system of adjustable color temperature of the present invention.
With reference to figure 3, the LED drivetrain of flyback adjustable color temperature of the present invention is unified the schematic diagram of execution mode.Described LED drive system comprises shown in LED load LED1, the LED2 of a LED driver, a rectifier diode D1, an output capacitance C1, different-colour state and the LED drive circuit 31(of adjustable color temperature of the present invention and Fig. 2 in circuit that same components symbol represents same or similar assembly), in present embodiment, described LED driver adopts flyback LED driver, LED load LED1, LED2 colour temperature difference, be generally color of sunshine and warm white.
Flyback LED driver comprises a transformer T1, and the secondary winding of transformer T1 connects rectifier diode D1 and circuit ground, and rectifier diode D1 connects output capacitance C1 and two paths of LED load LED1, LED2.Flyback LED driver is generally constant-current type output, at former limit power switch pipe, (be the power MOS pipe of former limit anti exciting converter, not shown) while closing, in transformer T1, energy storage is discharged in output capacitance C1 and LED load by rectifier diode D1, the energy in output capacitance C1 storage HF switch cycle, reduces the current ripples in LED load.
The secondary winding of transformer T1 (being the anode of rectifier diode D1) connects the sampling resistor R1 of the first sampling unit 21 simultaneously, the other end of sampling resistor R1 connects the anode of a sampling diode D2, the negative electrode of sampling diode D2 connects sampling capacitance C2, the other end connecting circuit ground of sampling capacitance C2.Sampling resistor R1 and sampling diode D2 series connection, and connect sampling capacitance C2, when flyback LED driver is worked, sampling resistor R1 is that sampling capacitance C2 charges by sampling diode D2, and on sampling capacitance C2, obtaining a direct voltage DET(is sampled voltage signal).
DET obtains i.e. the first sampled voltage signal of a low-voltage dc signal DET1(by divider resistance R2 and the R3 dividing potential drop of partial pressure unit 22), DET1 exports an input of switch detection comparator CP1 to, another input of switch detection comparator CP1 connects the first reference voltage source Ref1, the output connect state machine FSM of switch detection comparator CP1.
Voltage on the first sampling unit 21 sampling capacitance C2 is connected to timing capacitor C 3 by the second sampling unit 23 for electric diode D3, the other end connecting circuit ground of timing capacitor C 3, voltage stabilizing didoe ZD1 is parallel to timing capacitor C 3 two ends, timing electric capacity connects an input of timing comparator C P2, another input of timing comparator C P2 connects the second reference voltage source Ref2, the output connect state machine FSM of timing comparator C P2.Sampling capacitance C2, by being 3 chargings of timing capacitor C for electric diode D3, also obtains i.e. the second sampled voltage signal of a direct voltage VCC(in timing capacitor C 3).Shunt regulator tube ZD1 in timing capacitor C 3, ZD1 has limited the maximum of direct voltage VCC, has also limited the maximum of direct 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 lamp is closed, flyback LED driver quits work, and on transformer T1 secondary winding, without high-frequency impulse, sampling resistor R1 and sampling diode D2 stop the power supply for sampling capacitance C2, and DET voltage starts to decline.The mid point of divider resistance R2 and R3 obtains a signal DET1 who is directly proportional with DET voltage, switch detection comparator CP1 compares DET1 with Ref1, when DET voltage drop is during to Ref1 value, switch detection comparator CP1 upset and output signal to state machine FSM.Conventionally the capacitance of sampling capacitance C2 is more much smaller than the capacitance of timing capacitor C 3, so the speed of DET voltage drop is more a lot of soon than the speed of VCC voltage drop, when VCC voltage slow decreasing is during to reference voltage Ref2 value, timing comparator C P2 upset and output signal to state machine FSM.State machine FSM is by the signal of switch detection comparator CP1 and timing comparator C P2, and power ratio control switch mos transistor M1 and M2 turn on and off, thus control two-way different-colour LED load conducting whether, reach the object that colour temperature is selected.Its exemplary operation order is as shown in table 1.
| Switch motion | State | LED1 | LED2 |
| Start for the first time | 1 | Bright | Go out |
| Shutdown very soon start (CP1 upset, CP2 does not overturn) | 2 | Go out | Bright |
| Shutdown start very soon (CP1 upset, CP2 does not overturn) again | 3 | Bright | Bright |
| Shutdown start very soon (CP1 upset, CP2 does not overturn) again | 1 | Bright | Go out |
| Shutdown and start shooting again (CP1, CP2 all overturns) that wait for a period of time | 1 | Bright | Go out |
The LED drivetrain of table 1 adjustable color temperature of the present invention is unified exemplary operation order.
As preferred embodiment, as preferred embodiment, described adjustable color temperature module 24 further comprises: an operational amplifier EA1 and a status comparator CP3, its circuit connects referring to Fig. 2 and corresponding description thereof.
Operational amplifier EA1 and MOS transistor M10 form 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.Electric current on current setting resistance R5 flow through MOS transistor M10 and MOS transistor M7; MOS transistor M7, M8, M9 forms current mirror, thereby makes electric current and the electric current on current setting resistance R5 on MOS transistor M8 and M9 basic identical.Electric current on MOS transistor M8 is used for controlling current source Is1 and Is2, and electric current on Is1 and Is2 and the electric current on current setting resistance R5 are directly proportional.Electric current on current source Is1 and Is2 flow through MOS transistor M3 and M4; MOS transistor M5 and M3 are one group of current mirror, and MOS transistor M6 and M4 are one group of current mirror; The electric current on MOS transistor M5 and M6 is directly proportional to the electric current on current setting resistance R5; Thereby by regulating the electric current on current setting resistance R5, can when M1 and M2 close, to the LED electric current of each LED load, arrange, make LED1 and/or LED2 in glimmer state, thereby realize the function of night-light.Its exemplary operation order is as shown in table 2.
| Switch motion | State | LED1 | LED2 |
| Start for the first time | 1 | Bright | Go out |
| Shutdown very soon start (CP1 upset, CP2 does not overturn) | 2 | Go out | Bright |
| Shutdown start very soon (CP1 upset, CP2 does not overturn) again | 3 | Bright | Bright |
| Shutdown start very soon (CP1 upset, CP2 does not overturn) again | 4 | Glimmer | Glimmer |
| Shutdown and start shooting again (CP1, CP2 all overturns) that wait 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 lower, status comparator CP3 outputs signal to state machine FSM, when the input line switch perseveration of LED lamp being detected, state machine FSM can not enter the 4th state (glimmer), and directly periodic duty in the 1st to the 3rd state is as shown in table 1.
Fig. 4 is the circuit working typical waveform figure of 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 are while being high, represents that corresponding LED load lamp goes out.
When starting shooting for the first time, DET voltage follow VCC voltage rising, the 1:LED1 that now gets the hang of is bright, and LED2 goes out; After shutdown, VCC voltage slow decreasing, DET voltage declines rapidly, when DET voltage drop is to the upset threshold values of CP1, start again, DET voltage and VCC voltage rise to the clamp voltage of ZD1, and the 2:LED1 that now gets the hang of goes out, and LED2 is bright; When shutdown is also started shooting very soon again, get the hang of 3:LED1 and LED2 light simultaneously; When shutdown is also started shooting very soon again, 4:LED1 and the LED2 glimmer simultaneously that gets the hang of, the resistance of the electric current in LED1 and LED2 and current setting resistance R5 is directly proportional.If shutdown keeps certain hour, wait for that VCC voltage drop is to the upset threshold values of CP2, start again, it is bright that system resets to state 1:LED1, and LED2 goes out.
The present invention is by detecting opening and closing of LED lamp input line switch, control two-way different-colour LED load conducting with close, reach the object that colour temperature is selected.Described above is only an exemplary embodiments, each state of LED with and job order all can adjust to adapt to different application.
The LED drive system of adjustable color temperature of the present invention can also be detected and be carried out colour temperature adjusting by output voltage.With reference to figure 5, the schematic diagram of another execution mode of LED drive system of flyback adjustable color temperature of the present invention.Be with Fig. 3 illustrated embodiment difference, described the first sampling unit 21 comprises sampling resistor R1 and the sampling capacitance C2 that only comprises serial connection, the negative electrode of rectifier 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, and also detection and power supply signal end adopt output voltage signal VOUT to provide.LED drive circuit 41 driving methods of its adjustable color temperature and control logic and Fig. 3 illustrated embodiment are similar, do not repeat them here.
The LED drive circuit of adjustable color temperature of the present invention can be applied in non-isolated buck-type structure equally.With reference to figure 6, the schematic diagram of the LED drive system of voltage-dropping type adjustable color temperature of the present invention.Wherein, the drive principle of the LED drive circuit of adjustable color temperature and control logic and Fig. 3 illustrated embodiment are similar, do 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 make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. an adjustable color temperature module, is characterized in that, comprising: 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, be used for receiving one first sampled voltage signal, the second input of described switch detection comparator is connected with the output electricity of one first reference voltage source, and the output electricity of described switch detection comparator is connected to the first input end of described state machine;
The first input end of described timing comparator is another input of described adjustable color temperature module, be used for receiving one second sampled voltage signal, the second input of described timing comparator is connected with the output electricity of one second reference voltage source, and the output electricity of described timing comparator is connected to the second input of described state machine;
The first output electricity of described state machine is connected to the grid of described the first MOS transistor, the drain electrode of described the first MOS transistor is the first output of described adjustable color temperature module, for according to comparative result output one first voltage control signal of described switch detection comparator with control temperature state of the same colour LED load conducting with close;
The second output electricity of described state machine is connected to the grid of described the second MOS transistor, the drain electrode of described the second MOS transistor is the second output of described adjustable color temperature module, for according to the comparative result of described timing comparator, export a second voltage control signal with control another colour temperature state LED load conducting with close.
2. adjustable color temperature module according to claim 1, is characterized in that, described adjustable color temperature module further comprises: an operational amplifier and a status comparator, one input of described operational amplifier is connected with the source electrode electricity of a current setting resistance and 1 the tenth MOS transistor respectively, another input of described operational amplifier is connected with the output electricity of one the 3rd reference voltage source, and the output electricity of described operational amplifier connects the grid of described the tenth MOS transistor, the drain electrode electricity of described the tenth MOS transistor connects the drain electrode of one the 7th MOS transistor, and described the 7th MOS transistor and one the 8th MOS transistor, one the 9th MOS transistor form current mirror, the drain electrode electricity of described the 8th MOS transistor connects one first current source and one second current source, described the first current source is electrically connected the drain electrode of one the 3rd MOS transistor, described the 3rd MOS transistor and one the 5th MOS transistor form current mirror, the drain electrode electricity of described the 5th MOS transistor is connected to the first output of described adjustable color temperature module, described the second current source is electrically connected the drain electrode of one the 4th MOS transistor, described the 4th MOS transistor and one the 6th MOS transistor form current mirror, the drain electrode electricity of described the 6th MOS transistor is connected to the second output of described adjustable color temperature module, the drain electrode of described the 9th MOS transistor is connected with the input electricity of a load current source and described status comparator respectively, and the output electricity of described status comparator connects described state machine.
3. a LED drive circuit for adjustable color temperature, is characterized in that, comprises an adjustable color temperature module claimed in claim 1, one first sampling unit, a partial pressure unit and one second sampling unit;
Described the first sampling unit is connected with power supply signal end or the output voltage signal end electricity of LED drive circuit, for obtaining sampled voltage signal; Described partial pressure unit electricity connects described the first sampling unit, for described sampled voltage signal is carried out to dividing potential drop, obtains the first sampled voltage signal; Described the second sampling unit electricity connects described the first sampling unit, for obtaining the second sampled voltage signal; The first input end of described adjustable color temperature module connects described partial pressure unit by the first input end electricity of described switch detection comparator, the second input of described adjustable color temperature module connects described the second sampling unit by the first input end electricity of described timing comparator, the first output of described adjustable color temperature module connects the LED load negative electrode of temperature state of the same colour by the drain electrode electricity of described the first MOS transistor, the second output of described adjustable color temperature module connects the LED load negative electrode of another colour temperature state by the drain electrode electricity of described the second MOS transistor; According to the comparative result of described switch detection comparator and described timing comparator, control conducting or the disconnection of described the first MOS transistor and/or the second MOS transistor, so control different-colour state LED load conducting with close, thereby regulate colour temperature.
4. the LED drive circuit of adjustable color temperature according to claim 3, it is characterized in that, described the first sampling unit comprises sampling resistor and the sampling capacitance of serial connection, described sampling resistor is connected with the output voltage signal end electricity of LED drive circuit, and described sampling capacitance obtains described sampled voltage signal by described sampling resistor; Described partial pressure unit comprises upper divider resistance and the lower divider resistance of serial connection, described upper divider resistance one end is coupled between described sampling resistor and sampling capacitance, and the other end is connected with the first input end electricity of described lower divider resistance and described switch detection comparator respectively; Described the second sampling unit comprises that one for electric diode, a timing electric capacity and a voltage stabilizing didoe, the described electric diode one end that supplies is coupled between described sampling resistor and sampling capacitance, the other end is connected with described timing electric capacity electricity, described timing electric capacity obtains described the second sampled voltage signal by described for electric diode, described voltage stabilizing didoe parallel connection and described timing electric capacity two ends, wherein, the capacitance of described timing electric capacity is greater 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 the first sampling unit comprises sampling resistor, sampling diode and the sampling capacitance of serial connection, described sampling resistor is connected with the power supply signal end electricity of LED drive circuit, and described sampling capacitance obtains described sampled voltage signal by described sampling diode; Described partial pressure unit comprises upper divider resistance and the lower divider resistance of serial connection, described upper divider resistance one end is coupled between described sampling diode and sampling capacitance, and the other end is connected with the first input end electricity of described lower divider resistance and described switch detection comparator respectively; Described the second sampling unit comprises that one for electric diode, a timing electric capacity and a voltage stabilizing didoe, the described electric diode one end that supplies is coupled between described sampling resistor and sampling capacitance, the other end is connected with described timing electric capacity electricity, described timing electric capacity obtains described the second sampled voltage signal by described for electric diode, described voltage stabilizing didoe is parallel to described timing electric capacity two ends, wherein, the capacitance of described timing electric capacity is greater than the capacitance of described sampling capacitance.
6. the LED drive circuit of adjustable color temperature according to claim 3, is characterized in that, described adjustable color temperature module further comprises: an operational amplifier and a status comparator, one input of described operational amplifier is connected with the source electrode electricity of a current setting resistance and 1 the tenth MOS transistor respectively, another input of described operational amplifier is connected with the output electricity of one the 3rd reference voltage source, and the output electricity of described operational amplifier connects the grid of described the tenth MOS transistor, the drain electrode electricity of described the tenth MOS transistor connects the drain electrode of one the 7th MOS transistor, and described the 7th MOS transistor and one the 8th MOS transistor, one the 9th MOS transistor form current mirror, the drain electrode electricity of described the 8th MOS transistor connects one first current source and one second current source, described the first current source is electrically connected the drain electrode of one the 3rd MOS transistor, described the 3rd MOS transistor and one the 5th MOS transistor form current mirror, the drain electrode electricity of described the 5th MOS transistor is connected to the first output of described adjustable color temperature module, in order to control the electric current of the LED load of described temperature state of the same colour, described the second current source is electrically connected the drain electrode of one the 4th MOS transistor, described the 4th MOS transistor and one the 6th MOS transistor form current mirror, the drain electrode electricity of described the 6th MOS transistor is connected to the second output of described adjustable color temperature module, in order to control the electric current of the LED load of described another colour temperature state, the drain electrode of described the 9th MOS transistor is connected with the input electricity of a load current source and described status comparator respectively, and the output electricity of described status comparator connects described state machine.
7. a LED drive system for adjustable color temperature, comprises the LED load of a LED driver, a rectifier diode, an output capacitance and different-colour state, it is characterized in that, further comprises the LED drive circuit of adjustable color temperature claimed in claim 3;
Described LED driver is connected with described rectifier diode electricity, and described rectifier diode is connected with described output capacitance and each LED load electricity respectively; Described the first sampling unit is connected with described rectifier diode electricity, for obtaining sampled voltage signal; Described partial pressure unit electricity connects described the first sampling unit, for described sampled voltage signal is carried out to dividing potential drop, obtains the first sampled voltage signal; Described the second sampling unit electricity connects described the first sampling unit, for obtaining the second sampled voltage signal; The first input end of described adjustable color temperature module connects described partial pressure unit by the first input end electricity of described switch detection comparator, the second input of described adjustable color temperature module connects described the second sampling unit by the first input end electricity of described timing comparator, the first output of described adjustable color temperature module connects the LED load negative electrode of temperature state of the same colour by the drain electrode electricity of described the first MOS transistor, the second output of described adjustable color temperature module connects the LED load negative electrode of another colour temperature state by the drain electrode electricity of described the second MOS transistor; According to the comparative result of described switch detection comparator and described timing comparator, control conducting or the disconnection of described the first MOS transistor and/or the second MOS transistor, so control different-colour state LED load conducting with close, thereby regulate colour temperature.
8. the LED drive system of adjustable color temperature according to claim 7, it is characterized in that, described the first sampling unit comprises sampling resistor and the sampling capacitance of serial connection, described sampling resistor is connected with the negative electrode electricity of described rectifier diode, and described sampling capacitance obtains described sampled voltage signal by described sampling resistor; Described partial pressure unit comprises upper divider resistance and the lower divider resistance of serial connection, described upper divider resistance one end is coupled between described sampling resistor and sampling capacitance, and the other end is connected with the first input end electricity of described lower divider resistance and described switch detection comparator respectively; Described the second sampling unit comprises that one for electric diode, a timing electric capacity and a voltage stabilizing didoe, the described electric diode one end that supplies is coupled between described sampling resistor and sampling capacitance, the other end is connected with described timing electric capacity electricity, described timing electric capacity obtains described the second sampled voltage signal by described for electric diode, described voltage stabilizing didoe parallel connection and described timing electric capacity two ends, wherein, the capacitance of described timing electric capacity is greater 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 the first sampling unit comprises sampling resistor, sampling diode and the sampling capacitance of serial connection, described sampling resistor is connected with the power supply signal end electricity of LED drive circuit, and described sampling capacitance obtains described sampled voltage signal by described sampling diode; Described partial pressure unit comprises upper divider resistance and the lower divider resistance of serial connection, described upper divider resistance one end is coupled between described sampling diode and sampling capacitance, and the other end is connected with the first input end electricity of described lower divider resistance and described switch detection comparator respectively; Described the second sampling unit comprises that one for electric diode, a timing electric capacity and a voltage stabilizing didoe, the described electric diode one end that supplies is coupled between described sampling resistor and sampling capacitance, the other end is connected with described timing electric capacity electricity, described timing electric capacity obtains described the second sampled voltage signal by described for electric diode, described voltage stabilizing didoe is parallel to described timing electric capacity two ends, wherein, the capacitance of described timing electric capacity is greater than the capacitance of described sampling capacitance.
10. the LED drive system of adjustable color temperature according to claim 7, is characterized in that, described adjustable color temperature module further comprises: an operational amplifier and a status comparator, one input of described operational amplifier is connected with the source electrode electricity of a current setting resistance and 1 the tenth MOS transistor respectively, another input of described operational amplifier is connected with the output electricity of one the 3rd reference voltage source, and the output electricity of described operational amplifier connects the grid of described the tenth MOS transistor, the drain electrode electricity of described the tenth MOS transistor connects the drain electrode of one the 7th MOS transistor, and described the 7th MOS transistor and one the 8th MOS transistor, one the 9th MOS transistor form current mirror, the drain electrode electricity of described the 8th MOS transistor connects one first current source and one second current source, described the first current source is electrically connected the drain electrode of one the 3rd MOS transistor, described the 3rd MOS transistor and one the 5th MOS transistor form current mirror, the drain electrode electricity of described the 5th MOS transistor is connected to the first output of described adjustable color temperature module, described the second current source is electrically connected the drain electrode of one the 4th MOS transistor, described the 4th MOS transistor and one the 6th MOS transistor form current mirror, the drain electrode electricity of described the 6th MOS transistor is connected to the second output of described adjustable color temperature module, the drain electrode of described the 9th MOS transistor is connected with the input electricity of a load current source and described status comparator respectively, and the output electricity of described status comparator connects described state machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410248427.3A CN104010420B (en) | 2014-06-06 | 2014-06-06 | Adjustable color temperature module, the LED drive circuit of adjustable color temperature and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410248427.3A CN104010420B (en) | 2014-06-06 | 2014-06-06 | Adjustable color temperature module, the LED drive circuit of adjustable color temperature and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104010420A true CN104010420A (en) | 2014-08-27 |
| CN104010420B CN104010420B (en) | 2016-06-22 |
Family
ID=51370872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410248427.3A Active CN104010420B (en) | 2014-06-06 | 2014-06-06 | Adjustable color temperature module, the LED drive circuit of adjustable color temperature and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104010420B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106304518A (en) * | 2015-05-13 | 2017-01-04 | 华润矽威科技（上海）有限公司 | A kind of regulate LED colour temperature or the control circuit of brightness and method |
| 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 |
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 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106304518A (en) * | 2015-05-13 | 2017-01-04 | 华润矽威科技（上海）有限公司 | A kind of regulate LED colour temperature or the control circuit of brightness and method |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104010420B (en) | 2016-06-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10187938B2 (en) | Multichannel constant current LED controlling circuit and controlling method | |
| US9812975B2 (en) | Resonant converter with capacitive mode control and associated control method | |
| TWI492483B (en) | Step - up battery charge management system and its control method | |
| US8890440B2 (en) | Circuits and methods for driving light sources | |
| TWI633807B (en) | Switching power supply system, control circuit and associated control method | |
| CN103702486A (en) | LED driving circuit system, control circuit and control method | |
| CN103917028B (en) | A kind of LED constant current source and control method thereof | |
| CN203722871U (en) | LED drive circuit system and LED drive control circuit | |
| US20170288434A1 (en) | Switching power supply device | |
| US10492254B2 (en) | Power supply circuit and LED driving circuit | |
| TWI519200B (en) | Driving circuits, methods and controllers thereof for driving light sources | |
| EP3595413B1 (en) | Constant current led power supply circuit with maximum output power limiting circuit | |
| CN202424552U (en) | Voltage reduction type voltage-stabilizing and rectifying circuit | |
| GB2497213A (en) | Circuits and methods for driving light sources | |
| CN103517506B (en) | For the drive circuit of LED source power supply and method, power converter | |
| CN203788516U (en) | Intelligent dimming efficient constant-current LED driving chip | |
| CN104010420A (en) | Color-temperature-adjustable module and color-temperature-adjustable LED driving circuit and system | |
| CN104244517B (en) | The LED drive system of brightness-adjustable module and brightness-adjustable | |
| CN103580508B (en) | Ac/dc converter circuit | |
| CN103796389B (en) | High-high brightness hoisting module, controllable silicon light modulation LED drive circuit and system | |
| CN104124862A (en) | High-PFC constant current control device without loop compensation and voltage converter | |
| CN108235495A (en) | The LED drive circuit system of adjustable color | |
| US8836233B2 (en) | Light source apparatus and driving apparatus thereof | |
| CN203951650U (en) | The LED drive circuit of adjustable color temperature module, adjustable color temperature and system | |
| CN211019318U (en) | High-power L ED lighting device and power module for driving same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 5 room 504-511, room 2, Lane 666, Zhang Heng Road, Pudong New Area, China (Shanghai) free trade zone, Shanghai, China () Patentee after: Shanghai semiconducto Limited by Share Ltd Address before: Bi Sheng Lu Pudong New Area Zhangjiang hi tech park Shanghai 201204 Lane 299 No. 10 3 floor Patentee before: Shanghai Bright Power Semiconductor Co.,Ltd. |