CN104219840B - LED switch color temperature regulation controller and LED drive circuit - Google Patents
LED switch color temperature regulation controller and LED drive circuit Download PDFInfo
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- CN104219840B CN104219840B CN201410428982.4A CN201410428982A CN104219840B CN 104219840 B CN104219840 B CN 104219840B CN 201410428982 A CN201410428982 A CN 201410428982A CN 104219840 B CN104219840 B CN 104219840B
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Abstract
The invention relates to an LED switch color temperature regulation controller and an LED drive circuit and aims to control on/off of two LED sets powered via a direct-current constant current source. The LED switch color temperature regulation controller comprises a main power input end, an auxiliary power input end, a signal input end, a first drive signal output end, a second drive signal output end, an internal power supply circuit, an internal state storage, a drive signal generation circuit and a negative voltage clamping circuit. The internal power supply circuit connected to the main power input end and the auxiliary power input end is used for providing operating power; the internal state storage is used for cyclically changing and storing drive states of the LED sets according to sampling detection signals from the signal input end; the drive signal generation circuit is used for generating drive signals according to current drive states of the LED sets; the negative voltage clamping circuit is used for filtering negative voltage signals from the signal input end. The LED switch color temperature regulation controller and the LED drive circuit have the advantages that the structure of an LED switch color temperature regulation control circuit can be simplified, cost of the LED drive circuit can be decreased, and the size of the LED drive circuit can be reduced.
Description
Technical field
The present invention relates to field of LED illumination, more particularly, it relates to a kind of LED switch toning temperature controller and LED drive
Circuit.
Background technology
With the continuous expansion of LED illumination range of application, LED illumination is also from best single illumination functions gradually to intelligence
Change, hommization and energy saving direction develop.In order to meet people under different scenes to the requirement of light, possesses switch color-temperature regulating work(
The LED illumination lamp of energy is arisen at the historic moment.
At present existing color-temperature regulating scheme is regardless of the color-temperature regulating side realized using MCU or a kind of existing control chip
Case, is all extremely complex, is required for an independent detection circuit to detect input switch action.Due to being to input
The switch at end is detected that the circuit is required to bear high pressure, and input is the voltage of an exchange, in addition it is also necessary to the electricity
Pressure carries out rectification, so the detection circuit not only needs high voltage bearing components and parts but also needs rectification and the filter circuit of complexity.
Complicated circuit not only causes the cost of driving power supply to increase, and the volume of driving power supply can be caused to increase, and this is pushed away to LED
It is extensively unfavorable.
LED illumination colour temperature regulation scheme is mainly adjusted by remote control or input switch at present, in both technologies,
The cost adjusted by input switch is minimum, and without the need for transforming existing circuit, so switch color-temperature regulating side
Case increasingly obtains the acceptance of people.
Input switch color-temperature regulating is come the LED of the two-way different-colour of controlled output by the switch motion of input switch
The switch of pearl, for example, output has the LED (the generally LED of yellow and white) of two string different-colours, and input switch often switchs one
Secondary (i.e. short-circuit-open circuit is once), the LED string of conducting will change once, and the turn-on sequence of LED string can be held with input
The on an off circulation change of pass.Due to needing the action to input switch to detect, so needing to design a special inspection
Slowdown monitoring circuit is detected to input.The input detecting circuit of prior art is as shown in figure 1, by diode 101, filter capacitor
102 and 106, current-limiting resistance 103 and Zener diode 104 are constituted.Because input voltage is ac power waveform 200 at node 100
(as shown in Figure 2), its voltage is the high pressure of exchange, when detection circuit is detected to such voltage, should be born
Firmly the high pressure of several hectovolts, changes into the output voltage of exchange it is detected after DC voltage again.Current scheme
It is first AC-input voltage to be changed into DC voltage with diode 101, and behind and connects a larger high-voltage capacitance 102
It is filtered, also needs the DC voltage to be made up of resistance 103, Zener diode 104 and filter capacitor 106 by one afterwards
High pressure turn low-voltage circuit and be converted into low-voltage signal 201 (as shown in Figure 2).At node 105, the low-voltage signal 201 is input to control
The input of coremaking piece 107, control chip 107 judges the action of input switch by the signal, so as to control LED string 114
Switch.Because existing control chip can not typically directly drive MOS or IGCT, so needing to be designed using discrete component
An out drive circuit.The drive circuit is typically made up of resistance 108,109,111,112 and PNP type triode 110.
The scheme peripheral component of existing input switch color-temperature regulating is numerous, causes LED drive power plate to be difficult to accomplish little
Type, and cost can be caused to increase.
The content of the invention
The technical problem to be solved in the present invention is there is cost for existing input switch color-temperature regulating LED drive circuit
High, bulky defect, there is provided a kind of LED switch toning temperature controller and LED drive circuit.
The technical solution adopted for the present invention to solve the technical problems is：A kind of LED switch toning temperature controller is constructed, is used
In turning on/off for two groups of LED light groups for controlling to be powered by DC constant flowing power, the LED switch toning temperature controller includes：
Main power source input, for connecting external dc constant-current supply；
Accessory power supply input, for connecting external auxiliary power supply；
In-line power circuit, is connected to the main power source input and the accessory power supply input, for for the LED
Switch toning temperature controller provides working power；
Signal input part, for connecting the sampling node of DC constant flowing power outlet side by external sampling circuit, receiving
With regard to the sample detecting signal of the switch motion of the DC constant flowing power；
Internal state memory, for changing and storing LED light group driving condition according to the sample detecting signal cycle；
Drive signal generation circuit, drives for producing the first drive signal and second according to current LED light group driving condition
Dynamic signal；
First drive signal output end, is connected to the drive signal generation circuit, and for exporting described first letter is driven
Number, to control turning on/off for the first LED light group；
Second drive signal output end, is connected to the drive signal generation circuit, and for exporting described second letter is driven
Number, to control turning on/off for the second LED light group；And
Between the signal input part and the internal state memory, negative pressure clamp circuit is provided with, for filtering
State the negative pressure signal of signal input part.
In LED switch of the present invention toning temperature controller, the negative pressure clamp circuit and the internal state are deposited
Noise suppression circuit is provided between reservoir, for filtering the noise of the sample detecting signal of the signal input part input.
In LED switch of the present invention toning temperature controller, the negative pressure clamp circuit includes：First N-type MOS
Pipe, the second N-type metal-oxide-semiconductor and bias current sources；Wherein, the grid of the grid of the first N-type metal-oxide-semiconductor and the second N-type is connected, and with the
The drain electrode of two N-type metal-oxide-semiconductors is connected, and the drain electrode of the first N-type metal-oxide-semiconductor is connected with accessory power supply input；Bias supply one end with it is auxiliary
Power input is helped to connect, the other end is connected with the drain electrode of the second N-type metal-oxide-semiconductor, to carry out to the first N-type metal-oxide-semiconductor and the second N-type
Biasing；The source electrode of the first N-type metal-oxide-semiconductor is connected to signal input part, the source ground of the second N-type metal-oxide-semiconductor.
In LED switch of the present invention toning temperature controller, the noise suppression circuit and the internal state are deposited
Delay circuit is provided between reservoir, for filtering the transient signals change that the signal input part occurs, to avoid causing right
The erroneous judgement of the switch motion.
In LED switch of the present invention toning temperature controller, the delay circuit includes being made up of multiple d type flip flops
Counter.
In LED switch of the present invention toning temperature controller, the LED switch toning temperature controller is integrated circuit
LED switch color-temperature regulating control chip.
The technical solution adopted for the present invention to solve the technical problems is：A kind of LED drive circuit is constructed, for control not
State is turned on/off with two groups of LED light groups of colour temperature, the LED drive circuit includes：DC constant flowing power, LED as above
Switch toning temperature controller and the first driving switch pipe and the second driving switch pipe；Wherein
The signal input part of LED switch toning temperature controller is connected to DC constant flowing power outlet side by sample circuit
Sampling node；
The power input of LED switch toning temperature controller is connected to the defeated of DC constant flowing power by current-limiting resistance of powering
Go out end；
First drive signal output end of LED switch toning temperature controller connects the control of the first driving switch pipe
End, and the first LED light group positive pole is connected to the output end of DC constant flowing power, the negative pole of the first LED light group drives by first
Switching tube is grounded；
Second drive signal output end of LED switch toning temperature controller connects the control of the second driving switch pipe
End, and the second LED light group positive pole is connected to the output end of DC constant flowing power, the negative pole of the second LED light group drives by second
Switching tube is grounded.
In LED drive circuit of the present invention, including the accumulator as external auxiliary power supply, for described
Power for LED switch toning temperature controller in predetermined time interval after the switch cutoff of DC constant flowing power, to protect
Hold the current LED light group driving condition in the internal state memory of LED switch toning temperature controller.
In LED drive circuit of the present invention,
The DC constant flowing power is flyback constant-current supply, and the sampling node is transformer secondary output in flyback constant-current supply
The Same Name of Ends of coil；
The accumulator is storage capacitor, storage capacitor one end ground connection, another to terminate the LED switch color-temperature regulating
The accessory power supply input of controller；
The sample circuit is sampling current-limiting resistance.
In LED drive circuit of the present invention,
The DC constant flowing power is step-down constant current power supply, and the sampling node is step-down constant current power supply breaker in middle pipe
Drain electrode；
The accumulator is storage capacitor, storage capacitor one end ground connection, another to terminate the LED switch color-temperature regulating
The accessory power supply input of controller；
The sample circuit is sampling resistor.
Implement the invention has the advantages that：Due to adopting DC constant flowing power to power for LED light group, and by direct current
The sampling node of constant-current supply on off state is arranged on the outlet side of DC constant flowing power, thus sample detecting circuit is without the need for resistance to height
The components and parts of pressure and the rectification of complexity and filter circuit so that LED switch toning temperature control circuit structure is simplified, and is conducive to
Reduce the cost of LED drive circuit, reduce volume.In actual applications, for the lighting such as bulb lamp and shot-light, body
Product and cost it is critical that.
Description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is the schematic diagram of the LED drive circuit by switching color-temperature regulating of prior art；
Fig. 2 is the voltage oscillogram at LED drive circuit interior joint 100 and node 105 shown in Fig. 1；
Fig. 3 is the circuit theory diagrams of the LED drive circuit first embodiment that the present invention has switch toning temperature function；
Fig. 4 is the circuit block diagram of the LED switch color-temperature regulating control chip in LED drive circuit shown in Fig. 3；
Fig. 5 is the circuit theory diagrams of the negative pressure clamp circuit in the control chip of LED switch color-temperature regulating shown in Fig. 4；
Fig. 6 A are the circuit theory diagrams of the first delay circuit in the control chip of LED switch color-temperature regulating shown in Fig. 4；
Fig. 6 B are the circuit theory diagrams of the second delay circuit in the control chip of LED switch color-temperature regulating shown in Fig. 4；
Fig. 7 is the timing waveform of LED drive circuit shown in Fig. 3；
Fig. 8 is the circuit theory diagrams of the LED drive circuit second embodiment that the present invention has switch toning temperature function.
Specific embodiment
The present invention proposes a kind of brand-new LED colour temperature regulation schemes, LED switch toning temperature control circuit therein (including
LED switch is mixed colours temperature controller or control chip and peripheral circuit) LED that can apply to be powered by DC constant flowing power drives
Circuit, for example, can be applicable to the LED drive circuit powered by flyback constant-current supply, also apply be applicable to by the Constant Electric Current of decompression mode
The LED drive circuit that source powers.
The LED drive circuit of the present invention is used to control two groups of LED light groups of different-colour and turns on/off state.LED drives electricity
Road includes：DC constant flowing power, LED switch toning temperature controller and the first driving switch pipe and the second driving switch pipe；Its
The signal input part of middle LED switch toning temperature controller is connected to the sampling section of DC constant flowing power outlet side by sample circuit
Point；The power input of LED switch toning temperature controller is connected to the output end of DC constant flowing power by current-limiting resistance of powering；
First drive signal output end of LED switch toning temperature controller connects the control end of the first driving switch pipe, and the first LED
Group positive pole is connected to the output end of DC constant flowing power, and the negative pole of the first LED light group is grounded by the first driving switch pipe；LED
Second drive signal output end of switch toning temperature controller connects the control end of the second driving switch pipe, and the second LED light group
Positive pole is connected to the output end of DC constant flowing power, and the negative pole of the second LED light group is grounded by the second driving switch pipe.As excellent
Choosing, the LED drive circuit of the present invention also includes being used as the accumulator of external auxiliary power supply, for opening in DC constant flowing power
Power for LED switch toning temperature controller in predetermined time interval after concern is disconnected, to keep LED switch to mix colours temperature controller
Internal state memory in current LED light group driving condition.
Below in conjunction with Fig. 3 to Fig. 7, the first embodiment of the present invention is illustrated.
As shown in figure 3, the LED drive circuit that the present invention has switch toning temperature function includes the He of flyback constant-current supply 30
LED switch toning temperature control circuit.LED switch toning temperature control circuit is directly connected to the output end of flyback constant-current supply (i.e.
The negative pole of output commutation diode 308).
The flyback constant-current supply by control chip 317, switching tube 318, transformer 303, output commutation diode 308 and
Current sampling resistor 319 is constituted, wherein, the different name end of the primary coil of transformer 303 by rectifier bridge 302, input switch 301 with
AC power 300 connects, the drain electrode of the Same Name of Ends connecting valve pipe 318 of the primary coil of transformer 303.
LED switch toning temperature control circuit mainly includes LED switch color-temperature regulating control chip 309, sampling current-limiting resistance
305th, power current-limiting resistance 310, power supply storage capacitor 307 and respectively control LED light group 312 and 315 turn on/off first drive
The driving switch pipe 316 of dynamic switching tube 313 and second.Sampling one end of current-limiting resistance 305 and the Same Name of Ends of the secondary coil of transformer 303
(i.e. sampling node) 304 connects, and the other end connects with the signal input part (i.e. pin clk) of LED switch color-temperature regulating control chip 309
Connect.One end of power supply current-limiting resistance 310 connects with the output end (exporting the negative pole of commutation diode 308) of flyback constant-current supply
Connect, the other end is connected with the main power source input (i.e. pin vcc) of LED switch color-temperature regulating control chip 309.First driving switch
The control end of the driving switch pipe 316 of pipe 313 and second respectively with the first drive signal output end of control chip 309 (i.e. pin
L1) connect with the second drive signal output end (i.e. pin L2), colelctor electrode is connected respectively with LED light group 312 and 315, emitter stage
All it is connected with the ground wire of output.Power supply storage capacitor 307 one end ground connection is another to terminate the auxiliary of LED switch color-temperature regulating control chip
Help power input (i.e. pin vdd).
In the present embodiment, sampling is carried out by the signal of the Same Name of Ends (sampling node) 304 to transformer 303 defeated to judge
Enter short circuit or the open circuit of switch 301.In operating process, control chip 309 with its pin clk and sampling node 304 by being connected
The sampling current-limiting resistance 305 for connecing is sampled to the waveform of sampling node 304, so as to judge that input switch 301 is short-circuit condition
Or open-circuit condition, and according to the short/open state change of input switch 301 constantly changing the internal state of control chip 309
The state of memory, the different switch shape of state correspondence driving switch pipe 313 and 316 different in last internal state memory
State.Short circuit or open a way continuous circulation change of the switch of driving switch pipe 313 and 316 with input switch 301, for example, one
In individual period of change, switching tube 313 is opened, and switching tube 316 is closed；Followed by switching tube 313 is closed, and switching tube 316 is opened
Open；Be finally two switching tubes be all opening.Preferably, internal state memory can be realized by counter.As
Select, internal state memory can be with next by rest-set flip-flop, band EEPROM or flash storage etc.
Realize.
As shown in figure 4, according to an embodiment, the LED switch color-temperature regulating control chip in the LED drive circuit shown in Fig. 3
309 are provided with main power source input vcc, accessory power supply input vdd, signal input part clk, the first drive signal output end
L1, the second drive signal output end L2, earth terminal gnd；And the suppression of in-line power circuit 401, negative pressure clamp circuit 400, noise
Circuit processed 402, delay circuit 403, internal state memory 404 and drive signal generation circuit 405.
Wherein, in operation, in-line power circuit 401 is used to connect main power source input vcc and accessory power supply is defeated
Enter to hold vdd, to provide working power for LED switch color-temperature regulating control chip；Signal input part clk is used to pass through external sampling
The sampling node of circuit (current-limiting resistance 305 of for example sampling) connection DC constant flowing power, to receive with regard to DC constant flowing power
The sample detecting signal of input switch action；Internal state memory 404 is used to change and deposit according to sample detecting signal cycle
Storage LED light group driving condition；Negative pressure clamp circuit 400 is arranged between signal input part clk and internal state memory 404,
For filtering the negative pressure signal of signal input part clk.Drive signal generation circuit 405 is used for according to internal state memory storage
Current LED light group driving condition produce the first drive signal and the second drive signal；First drive signal output end L1 connects
In drive signal generation circuit, for exporting the first drive signal, to control turning on/off for the first LED light group；Second drive signal
Output end L2 is connected to drive signal generation circuit, for exporting the second drive signal, to control turning on/off for the second LED light group；
And noise suppression circuit is arranged between negative pressure clamp circuit 400 and internal state memory 404, for filtering signal input part
The noise of the sample detecting signal of clk inputs.Delay circuit 403 is arranged on noise suppression circuit and internal state memory 404
Between, for filtering the transient signals change of signal input part clk appearance, to avoid transient signals change from being caused to switch
The erroneous judgement of action.
It should be noted that the LED switch color-temperature regulating control chip 309 in the LED drive circuit shown in Fig. 3 can be collection
Into circuit chip, the LED switch that also can be made up of discrete elements mixes colours temperature controller to substitute.
In the first embodiment of LED drive circuit of the present invention, due to the Same Name of Ends (sampling of the secondary coil of transformer 303
Node) there is very high negative pressure in 304 waveform 702, if not carrying out clamper to negative pressure, can be to the inside of control chip 309 unit
Part causes to damage.In order to carry out clamper to negative pressure, control chip inside is special to arrange negative pressure clamp circuit 400.As shown in figure 5,
Negative pressure clamp circuit includes：First N-type metal-oxide-semiconductor 501, the second N-type metal-oxide-semiconductor 502 and bias current sources 503；Wherein, the first N-type
The grid of the grid of metal-oxide-semiconductor 501 and the second N-type 502 is connected, and is connected with the drain electrode of the second N-type metal-oxide-semiconductor 502, the first N-type MOS
The drain electrode of pipe 501 is connected with accessory power supply input vdd；Bias supply one end is connected with accessory power supply input vdd, the other end
It is connected with the drain electrode of the second N-type metal-oxide-semiconductor 502, to be biased to the first N-type metal-oxide-semiconductor 501 and the second N-type 502；First N-type
The source electrode of metal-oxide-semiconductor 501 is connected to signal input part clk, the source ground of the second N-type metal-oxide-semiconductor 502.
Due to the electric current very little of bias current sources 503, so metal-oxide-semiconductor 501 and 502 is all biased to weak conducting state.When drawing
When there is negative pressure at pin clk, the gate source voltage of metal-oxide-semiconductor 501 increase so as to enter the state of conducting through metal-oxide-semiconductor 501 and is drawn
The electric current Ic increases that pin clk flows out, the electric current produces a pressure reduction Vc after current-limiting resistance 305 of sampling, for compensating sampling
The negative pressure that node 304 occurs, it is ensured that in the voltage of the pin clk of control chip 309 be not in negative pressure.Internal signal clkb is
Signal of the sample detecting signal that pin clk is received after negative pressure clamp circuit, the part of negative pressure has been filtered out, should
Noise suppression circuit inside signal input to control chip.
Fig. 7 is the timing waveform of LED drive circuit shown in Fig. 3, wherein,
Waveform 700：What is represented is the open and closed of input switch 301；
Waveform 701：What is represented is the input signal of rectifier bridge 302；
Waveform 702：Signal at the secondary coil Same Name of Ends (i.e. sampling node) 304 of transformer 303；
Waveform 703：What is represented is the output signal of delay circuit 403, that is, the id signal inside control chip；
Waveform 704：What is represented is for touching inside internal state memory 404 according to the generation of the trailing edge of signal 703
Send out the trigger of the transformation of the state of internal state memory；
Waveform 705 and 706：What is represented is internal state signal.
From figure 7 it can be seen that when the short circuit of input switch 301 (switch closure), in the sampling node 304 of transformer 303
The waveform 702 of a similar square wave occurs, the waveform maximum is positive, and minimum of a value is negative, and its positive maximum is defeated
Go out positive bias-voltage of the voltage plus commutation diode 308, the absolute value of minimum of a value is multiplied by the circle of transformer 303 for input voltage
Than.When input switch 301 opens a way (switch cutoff), control chip 309 quits work, and the waveform at node 304 disappears, control
Chip 309 can just pass through the presence or absence for sampling and detecting the waveform, so as to judge that input switch 301 is in short-circuit condition
Or open-circuit condition.When the waveform duration at sampling node 304 is more than Td1, then control chip 309 is considered as input and opens
Pass 301 is short-circuit, and the id signal 703 inside control chip becomes 1 from state 0, when the waveform in sampling node 304 disappears
Lose, and locate to continue the time of Td2, then control chip 309 is considered as input switch 301 and has opened a way, the mark inside control chip
Know signal 703 and become 0 from state 1, a trailing edge occur.Control chip 309 be exactly according to control chip inside mark letter
The internal state of numbers 703 continuous varying cyclicallies oneself, when the trailing edge of the id signal 703 detected inside control chip,
Just change the state of an internal state memory.Why control chip 309 adds time delay by delay circuit 403
Td1 and Td2, is because in actual applications, flyback constant-current supply often occurs after the open circuit of input switch 301, because
High-voltage capacitance (being located between the output of rectifier bridge 302 and ground wire, not shown in Fig. 3) after rectification yet suffers from electricity, should
Electricity makes enough flyback current constant control chip 317 restart once, waveform occurs in sampling node 304, due to input switch
It is to disconnect, the electricity of high-voltage capacitance is discharged soon, so the working time is very short, control chip 309 must be to this situation
Filtered, can otherwise cause state chaotic.Situation is restarted after in order to filter this shutdown, control chip 309 is by time delay electricity
Road 403 adds the waveform at the sampling node 304 of a time delay Td1, i.e. transformer secondary coil must continuously be occurred
At least to be just considered input switch 301 short-circuit the time of Td1, is otherwise considered as misoperation.Td2 is in order to avoid in exchange
During the lowest point of electricity, the voltage in high-voltage capacitance may not enough support power work, of short duration switch occur and stop, and waveform 702 disappears
Lose, cause the erroneous judgement of control chip 309.Control chip 309 can be avoided clk temporary transient stopping by delay circuit 403
It is considered the shut-off of input switch, because particularly in the circuit with power factor emendation function, in the lowest point of input signal
When, because operating voltage not enough occurs the of short duration stoppings of clk.
In LED switch color-temperature regulating control chip of the present invention, delay circuit includes the first delay circuit and the second delay circuit,
For filtering the transient signals change of signal input part (clk) appearance, to avoid causing the erroneous judgement to switch motion.Hereinafter tie
Fig. 6 A and 6B illustrated embodiments are closed, the specific embodiment of delay circuit is illustrated.It should be noted that the time delay electricity in the present invention
Road is not limited to this embodiment, knows as is known to the person skilled in the art, and the delay circuit, example can be also realized using other modes
Such as：Realized using the method for RC retardation ratio.
Fig. 6 A are the circuit theory diagrams of the first delay circuit in the control chip of LED switch color-temperature regulating shown in Fig. 4, and first prolongs
When circuit be used for when signal input part (clk) occur square-wave signal (for example input switch 301 is short-circuit) beginning, the time delay Td1 times
Behind interval, export for confirming the signal that square-wave signal occurs, i.e., now the square wave of id signal 703 becomes high level from low level
That is rising edge.
Fig. 6 B are the circuit theory diagrams of the second delay circuit in the control chip of LED switch color-temperature regulating shown in Fig. 4；Second prolongs
When circuit be used for when signal input part (clk) square-wave signal (for example input switch 301 is opened a way) disappear start, the time delay Td2 times
Behind interval, export for confirming the signal that square-wave signal disappears, i.e., now the square wave of id signal 703 becomes low level from high level
That is trailing edge.
As shown in Figure 6A, the first delay circuit (i.e. Td1 delay circuits) is main by reset signal generating circuit and counter
Composition.Wherein reset signal generating circuit is made up of MOSFET 600, resistance 601, electric capacity 603 and NAND gate 602, counter by
D type flip flop is constituted.M d type flip flop 604～605 constitutes cycle counter, and 2 d type flip flops 606 and 607 constitute shift count
Device, wherein, the value of M determines the duration of Td1.The output of cycle counter is arrived as the clock signal input of shift counter
The clock signal pin position clk of shift counter.One end of resistance 601 is connected with internal electric source vdd, other end with
The drain electrode of MOSFET600 is connected, and the source electrode of MOSFET 600 is connected to ground wire, the drain electrode of MOSFET 600 as output end with
The input of not gate 602 is connected, and the output of NAND gate 602 is input to the reset of d type flip flop as reset signal R1 of counter
End R, electric capacity 603 is connected between the drain electrode of MOSFET 600 and ground wire.Cycle counter is made up of M d type flip flop, D triggerings
The reset terminal of device is all connected with output signal R1 of reset signal generating circuit, the D ends of previous d type flip flop be connected with Q- and with
The clk pins of latter d type flip flop are connected, and the clk of first d type flip flop 604 is connected with internal signal clkb signals, last
The Q- of individual trigger 605 is connected as output end with the clock pins clk of shift counter.D type flip flop in shift counter
606 and 607 reset pin R is connected with R1, and the clock pins clk and the D in cycle counter of d type flip flop 606 and 607 are triggered
The Q- of device 605 is connected, and the D pins of d type flip flop 606 are connected with internal electric source vdd, the D pin phases of its Q pin and d type flip flop 607
Even, the Q pin of d type flip flop 607 is the output end of whole Td1 delay circuits.
The operation principle of the first delay circuit is：When clkb signals do not occur, namely clkb be low level, MOSFET
600 are off state, and electric capacity 603 is charged by resistance 601, when the voltage at electric capacity two ends overturns higher than NAND gate 602
Threshold voltage when, output end R1 of reset signal generating circuit is low level, and the low level is entered to the d type flip flop in counter
Row resets, so the output end of counter, namely the Q ends of d type flip flop 607 are low level.
When square-wave signal occurs in clkb, each cycle of MOSFET 600 discharges electric capacity 603, namely NAND gate
602 input terminal voltage is unable to reach the threshold voltage of the upset of NAND gate, so output signal R1 of NAND gate is flat for high point,
Because signal R1 is the reset signal of whole counter, it is invalid that the signal resets when being high level, while clkb is used as counter
Clock signal, so forward part cycle counter start working, when cycle counter reaches a cycle, d type flip flop
There is a clock signal in 605 output, the clock signal as the shift counter of rear part clock, when clock signal goes out
When existing one time, the Q ends of d type flip flop 606 become high level from low level, when clock signal occurs second, d type flip flop 607
Q ends also become high level from low level.There is square-wave signal from clkb and start to count Q ends to d type flip flop 607 from low level
Become high level, the time interval is Td1.
As shown in Figure 6B, the second delay circuit (i.e. Td2 delay circuits) is by reset signal noise filter circuit and circulation meter
Number device composition.Reset signal noise filter circuit is made up of MOSFET 608, resistance 609 and electric capacity 610, one end of resistance 609
It is connected with internal electric source vdd, the other end of resistance 609 is connected with the drain electrode of MOSFET 608, and its node is used as the circuit
Output end R2, the source electrode of MOSFET 608 is connected with ground wire, and electric capacity 610 is connected between the drain electrode of MOSFET 608 and source electrode.
Cycle counter is made up of N number of d type flip flop 612,613 ... 614, wherein, the value of N determines the duration of Td2, d type flip flop
612nd, 613 ... 614 reset terminal pin R is connected with output end R2 of reset signal noise filter circuit, and d type flip flop 612 is arrived
A total of N number of between 614, each d type flip flop pin D is connected with its pin Q-, and in addition to d type flip flop 612, latter D is touched
The pin clk for sending out device is connected with the pin Q- of previous trigger, the clock letter of the pin clk of d type flip flop 612 and an inside
Numbers 611 are connected, the pin Q- of d type flip flop 614 for Td2 delay circuits output end.
The operation principle of the second delay circuit is：In the presence of the square wave of signal clkb, the signal is made an uproar through reset signal
Signal R2 after sound filter circuit is also a square wave, and the square wave constantly resets to the d type flip flop of counter, so output
End, namely the pin Q- of d type flip flop 614 is high level.
When signal clkb square wave disappear when, namely clkb be electronegative potential when, the state that MOSFET 608 is off, electricity
Hold 610 to be charged by resistance 609, output end R2 is high level, the high level causes the reset of d type flip flop to fail, circulate
Counter internally under the driving of clock signal 611, is counted.When cycle counter reaches a cycle, Td2 deferred telegrams
The level of the pin Q- of the output end on road, i.e. d type flip flop 614 becomes low level from high level, disappears from the square-wave signal of clkb
To the level of the pin Q- of d type flip flop 614, to become low time from height be time delay Td2.
In addition, during input switch 301 is opened a way, control chip 309 quits work, control chip 309 cannot be by supplying
Electric current-limiting resistance 310 is powered, but in a period of time (generally 3 seconds) after input switch 301 is opened a way, in control chip
The state of the status register in portion has to be maintained, namely must during this period of time have another auxiliary power supply
Source.In the LED drive circuit of the present invention, accumulator is introduced, as external auxiliary power supply, so as in DC constant flowing power
Switch cutoff after predetermined time interval in for LED switch toning temperature controller power, with keep LED switch mix colours temperature control
Current LED light group driving condition in the internal state memory of device processed.For example, using power supply storage capacitor 307, the electric capacity is just
It is to power to control chip in several seconds after opening a way in input switch 301, keeping the state of internal state memory.
The electric capacity is fully charged during the short circuit of input switch 301, and during input switch 301 is opened a way, electric capacity 307 is discharged, together
When in order to be kept for the longer time, input switch 301 open a way during, the operating current of control chip can at once be reduced to 1uA
Left and right, the retention time can be adjusted by changing the size of storage capacitor 307.
The LED switch toning temperature controller of the present invention, in being not only used directly for the flyback constant-current supply isolated, may be used also
In to be directly used in the buck configuration of non-isolated, as shown in Figure 8.Step-down constant current power supply 80 includes control chip 800, switching tube
801st, current sampling resistor 802 and commutation diode 803, step-down constant current power supply 80 is handed over by diode, input switch connection
Stream power supply.
As shown in figure 8, in the second embodiment of the present invention, in LED drive circuit, LED switch color-temperature regulating control chip
806 pin clk is connected by sampling resistor 805 with the drain electrode (i.e. sampling node) of the breaker in middle pipe 801 of step-down constant current power supply 80
Connect, while being connected with one end of inductor 804, the other end of inductor 804 ground connection.The pin L1 and L2 difference of control chip 806
Be connected with the control end of driving switch pipe 808 and 809, for control respectively LED light group 810 and 811 be switched on and off it is (i.e. bright
With go out).Power supply current-limiting resistance 807 one end with output positive pole (i.e. the negative pole of commutation diode 803) be connected, other end and
The pin vcc connections of control chip 806, for being powered to control chip 806.The one end of storage capacitor 812 and control chip
806 pin vdd connections, the other end is connected with the ground wire of output.
According to one embodiment of the invention, LED drive circuit include LED switch color-temperature regulating control chip, sampling current-limiting resistance,
The switching tube of power supply current-limiting resistance, storage capacitor and two control different-colour LED.Sampling current-limiting resistance one end and flyback constant current
The transformer secondary output winding of power supply is connected, and the other end is connected with the pin clk of LED switch color-temperature regulating control chip, current limliting of powering
One end of resistance is connected with the output cathode of flyback constant-current supply, the pin vcc of the other end and LED switch color-temperature regulating control chip
Be connected, storage capacitor is connected with the pin vdd of LED switch color-temperature regulating control chip, control LED switch controlled end respectively with
The output end of LED switch color-temperature regulating control chip is connected.
In the LED drive circuit transformer secondary output winding output end is detected by current-limiting resistance of sampling, when this
There is waveform, and duration more than the time of a setting in node, is considered as input switch short circuit；When the waveform of the node disappears
Lose, and the duration is more than the time of a setting, is considered as input switch open circuit.LED switch color-temperature regulating control chip passes through
The sampling current-limiting resistance is detected so as to judge the action of input switch to transformer output end, and then controls internal state.
In the LED drive circuit LED switch color-temperature regulating control chip is powered by current-limiting resistance of powering, the resistance is carried
For electric current a part for LED switch color-temperature regulating control chip normal work, another part be used for storage capacitor is entered
Row charges.
In the LED drive circuit, storage capacitor is used for when input switch is opened a way to LED switch color-temperature regulating control chip
Power supply, to keep the state inside LED switch color-temperature regulating control chip.Due to when input switch is opened a way, LED switch color-temperature regulating
The operating current of control chip falls below 1uA or so, it is possible to which the state that adjusted by changing the size of storage capacitor keeps
Time.
In the LED drive circuit, driving switch pipe in addition to cost consideration uses triode, works as output current
When larger, it is also possible to replaced using MOSFET.
LED switch color-temperature regulating control chip of the present invention can be used not only in the constant-current supply isolated, it is also possible to for dropping
In the constant-current control circuit of die pressing type.According to another embodiment of the present invention, the pin clk of LED switch color-temperature regulating control chip leads to
Over-sampling resistance is connected with one end of inductor in step-down constant current power supply.LED switch color-temperature regulating control chip output end with open
Close the connection of pipe control end.The positive pole that exports with step-down constant current power supply of one end of power supply current-limiting resistance is connected, other end and LED
The pin vcc connections of switch color-temperature regulating control chip.Storage capacitor one end and the pin vdd of LED switch color-temperature regulating control chip
Connection, the other end is connected with the ground wire of output.
Above example technology design only to illustrate the invention and feature, its object is to allow person skilled in the art
Scholar will appreciate that present disclosure and implement accordingly, can not limit the scope of the invention.It is all to want with right of the present invention
The impartial change that scope is done and modification are asked, the covering scope of the claims in the present invention all should be belonged to.
Claims (7)
1. a kind of LED switch is mixed colours temperature controller, for turning on/off for two groups of LED light groups controlling to be powered by DC constant flowing power,
Characterized in that, the LED switch toning temperature controller includes：
Main power source input（vcc）, for connecting external dc constant-current supply, the DC constant flowing power includes rectification circuit
（302）, be connected to the transformer of rectification output end（303）And the high-voltage capacitance being connected between rectification output end and ground, it is described
Transformer（303）Second coil side be the DC constant flowing power outlet side；
Accessory power supply input（vdd）, for connecting external auxiliary power supply；
In-line power circuit（401）, it is connected to the main power source input（vcc）With the accessory power supply input（vdd）, use
In for the LED switch toning temperature controller working power is provided；
Signal input part（clk）, for connecting the sampling node of DC constant flowing power outlet side by external sampling circuit
（304）, receive with regard to the DC constant flowing power switch motion sample detecting signal；
Delay circuit（403）, for filtering the signal input part（clk）The transient signals change of appearance, to avoid because described
High-voltage capacitance and cause the erroneous judgement to the switch motion；
Internal state memory（404）, for being changed according to the sample detecting signal cycle and store LED light group drive shape
State；
Drive signal generation circuit（405）, drive for producing the first drive signal and second according to current LED light group driving condition
Dynamic signal；
First drive signal output end（L1）, the drive signal generation circuit is connected to, drive letter for exporting described first
Number, to control turning on/off for the first LED light group；
Second drive signal output end（L2）, the drive signal generation circuit is connected to, drive letter for exporting described second
Number, to control turning on/off for the second LED light group；And
The signal input part（clk）And the internal state memory between, negative pressure clamp circuit is provided with（400）, it is used for
Filter the signal input part（clk）Negative pressure signal；
Wherein, the delay circuit（403）Including：
First delay circuit, for working as signal input part（clk）There is square-wave signal to start, it is defeated after the time delay very first time is spaced
Go out for confirming the signal that square-wave signal occurs；
Second delay circuit, for working as signal input part（clk）Square-wave signal disappears and starts, defeated after the time interval of time delay second
Go out for confirming the signal that square-wave signal disappears；
Wherein, the negative pressure clamp circuit includes：First N-type metal-oxide-semiconductor（501）, the second N-type metal-oxide-semiconductor（502）And bias current sources
（503）；Wherein, the first N-type metal-oxide-semiconductor（501）Grid and the second N-type（502）Grid be connected, and with the second N-type metal-oxide-semiconductor
（502）Drain electrode be connected, the first N-type metal-oxide-semiconductor（501）Drain electrode and accessory power supply input（vdd）Connection；Bias supply one end
With accessory power supply input（vdd）Connection, the other end and the second N-type metal-oxide-semiconductor（502）Drain electrode be connected, with to the first N-type MOS
Pipe（501）With the second N-type metal-oxide-semiconductor（502）It is biased；First N-type metal-oxide-semiconductor（501）Source electrode be connected to signal input part
（clk）, the second N-type metal-oxide-semiconductor（502）Source ground.
2. LED switch according to claim 1 is mixed colours temperature controller, it is characterised in that the negative pressure clamp circuit and institute
State delay circuit（403）Between be provided with noise suppression circuit（402）, for filtering the signal input part（clk）Input
The noise of sample detecting signal.
3. LED switch according to claim 1 is mixed colours temperature controller, it is characterised in that the delay circuit（403）Including
The counter being made up of multiple d type flip flops.
4. LED switch according to any one of claim 1 to 3 is mixed colours temperature controller, it is characterised in that the LED is opened
It is integrated circuit LED switch color-temperature regulating control chip to close toning temperature controller.
5. a kind of LED drive circuit, two groups of LED light groups for controlling different-colour turn on/off state, it is characterised in that institute
Stating LED drive circuit includes：DC constant flowing power, the LED switch color-temperature regulating control as any one of Claims 1-4
Device and the first driving switch pipe and the second driving switch pipe；Wherein
The signal input part of LED switch toning temperature controller（clk）DC constant flowing power outlet side is connected to by sample circuit
Sampling node（304）；
The power input of LED switch toning temperature controller（vcc）By current-limiting resistance of powering（310、807）It is connected to direct current permanent
The output end of stream power supply；
First drive signal output end of LED switch toning temperature controller（L1）Connect the control of the first driving switch pipe
End, and the first LED light group positive pole is connected to the output end of DC constant flowing power, the negative pole of the first LED light group drives by first
Switching tube is grounded；
Second drive signal output end of LED switch toning temperature controller（L2）Connect the control of the second driving switch pipe
End, and the second LED light group positive pole is connected to the output end of DC constant flowing power, the negative pole of the second LED light group drives by second
Switching tube is grounded.
6. LED drive circuit according to claim 5, it is characterised in that include being used as the energy storage electricity of external auxiliary power supply
Road, for being LED switch toning temperature control in the predetermined time interval after the switch cutoff of the DC constant flowing power
Device processed is powered, with the current LED light group driving condition in the internal state memory for keeping LED switch toning temperature controller.
7. LED drive circuit according to claim 6, it is characterised in that
The DC constant flowing power is flyback constant-current supply, and the sampling node is transformer in flyback constant-current supply（303）It is secondary
The Same Name of Ends of level coil；
The accumulator is storage capacitor（307）, the storage capacitor（307）One end is grounded, another to terminate the LED switch
The accessory power supply input of toning temperature controller（vdd）；
The sample circuit is sampling current-limiting resistance（305）.
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| CN105025632B (en) * | 2015-07-30 | 2018-09-21 | 深圳市芯飞凌半导体有限公司 | A kind of LED lamp and its control circuit of switch toning |
| CN105007662A (en) * | 2015-07-30 | 2015-10-28 | 深圳市芯飞凌半导体有限公司 | LED light and dual power supply switch color temperature tuning control circuit thereof |
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| US10034346B2 (en) | 2016-04-27 | 2018-07-24 | Lumileds Llc | Dim to warm controller for LEDs |
| CN105764201B (en) * | 2016-05-04 | 2017-09-05 | 无锡硅动力微电子股份有限公司 | Toning temperature control circuit |
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| CN105979660B (en) * | 2016-06-24 | 2017-12-19 | 深圳市富满电子集团股份有限公司 | A kind of LED, LED colour temperature adjustment control chips and circuit |
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| CN106341925B (en) * | 2016-09-21 | 2018-05-08 | 深圳市芯飞凌半导体有限公司 | LED drive chip, can colour temperature adjust LED drive power system and LED lamp |
| CN106793324B (en) * | 2017-01-04 | 2019-03-05 | 上海晶丰明源半导体股份有限公司 | Switch toning temperature controller and method, LED constant current drive system |
| CN109149944B (en) * | 2018-09-14 | 2020-07-10 | 电子科技大学 | On-chip integrated active negative voltage clamping circuit suitable for flyback converter |
| CN109089351A (en) * | 2018-10-18 | 2018-12-25 | 上海灿瑞科技股份有限公司 | A kind of LED drive power chip |
| CN110248440B (en) * | 2019-05-06 | 2021-10-19 | 深圳市安规科技有限公司 | Double-circuit switching power supply and lamp device |
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Effective date of registration: 20210315 Address after: Building C, No.888, Huanhu West 2nd Road, Lingang New District, Pudong New Area pilot Free Trade Zone, Shanghai Patentee after: Shanghai Xinfei Semiconductor Technology Co.,Ltd. Address before: 8g, west block, Changxing Plaza, 126 Changxing Road, Nanshan District, Shenzhen, Guangdong 518000 Patentee before: SILICON DRIVER SEMICONDUCTOR Co.,Ltd. |