CN104219840A - 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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- CN104219840A CN104219840A CN201410428982.4A CN201410428982A CN104219840A CN 104219840 A CN104219840 A CN 104219840A CN 201410428982 A CN201410428982 A CN 201410428982A CN 104219840 A CN104219840 A CN 104219840A
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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, relate to a kind of LED switch color-temperature regulating controller and LED drive circuit.
Background technology
Along with the continuous expansion of LED illumination range of application, LED illumination also develops to intellectuality, hommization and energy saving direction gradually from the most single illumination functions.In order to meet people's requirement to light under different sight, the LED illumination lamp possessing switch color-temperature regulating function is arisen at the historic moment.
The color-temperature regulating scheme no matter current existing color-temperature regulating scheme uses MCU or a kind of existing control chip to realize is all very complicated, all need one independently testing circuit input switch action is detected.Owing to being detect the switch of input, this circuit needs to bear high pressure, and input is the voltage exchanged, and also needs to carry out rectification to this voltage, so this testing circuit not only needs rectification and the filter circuit of high voltage bearing components and parts but also needs complexity.Complicated circuit not only causes the cost of driving power to increase, and the volume of driving power can be caused to increase, and this is disadvantageous to the popularization of LED.
LED illumination colour temperature regulation scheme regulates mainly through remote control or input switch at present, in these two kinds of technology, the cost regulated by input switch is minimum, and without the need to transforming existing circuit, so switch color-temperature regulating scheme more and more obtains the acceptance of people.
Input switch color-temperature regulating is the switch of the LED lamp bead being controlled the two-way different-colour exported by the switch motion of input switch, such as, export and have the LED of two string different-colours (being generally LED that is yellow and white), the every switch of input switch is (namely short circuit-open circuit once) once, the LED string of conducting will change once, and the turn-on sequence of LED string can holding and closing circulation change along with input switch.Owing to needing to detect the action of input switch, so need the special testing circuit of design one to detect input.As shown in Figure 1, by diode 101, filter capacitor 102 and 106, current-limiting resistance 103 and voltage stabilizing didoe 104 form the input detecting circuit of prior art.Because node 100 place input voltage is ac power waveform 200 (as shown in Figure 2), its voltage is the high pressure exchanged, when testing circuit detects such voltage, the high pressure of a few hectovolt should be sustained, after again the output voltage exchanged being changed into direct voltage, it is detected.Current scheme first with diode 101, AC-input voltage is changed into direct voltage, and thereafter and connect a larger high-voltage capacitance 102 and carry out filtering, also to need this direct voltage by one by resistance 103 afterwards, the high pressure that voltage stabilizing didoe 104 and filter capacitor 106 form turns low-voltage circuit and converts low-voltage signal 201 (as shown in Figure 2) to.Node 105 place, this low-voltage signal 201 is input to the input of control chip 107, and control chip 107 judges the action of input switch by this signal, thus controls the switch of LED string 114.Because existing control chip generally can not Direct driver MOS or thyristor, so need to use discrete component to design a drive circuit.This drive circuit is generally 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 miniaturization, and cost can be caused to increase.
Summary of the invention
The technical problem to be solved in the present invention is, there is high, the bulky defect of cost, provide a kind of LED switch color-temperature regulating controller and LED drive circuit for existing input switch color-temperature regulating LED drive circuit.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of LED switch color-temperature regulating controller, for two groups of LED groups controlling to be powered by DC constant flowing power bright/go out, described LED switch color-temperature regulating controller comprises:
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 described main power source input and described accessory power supply input, for providing working power for described LED switch color-temperature regulating controller;
Signal input part, for connecting the sampling node of DC constant flowing power outlet side, receiving the sample detecting signal of the switch motion about described DC constant flowing power by external sampling circuit;
Internal state memory, for changing according to described sample detecting signal cycle and storing LED group driving condition;
Drive signal generation circuit, for producing the first drive singal and the second drive singal according to current LED group driving condition;
First drive singal output, is connected to described drive signal generation circuit, for exporting described first drive singal, with control the first LED group bright/go out;
Second drive singal output, is connected to described drive signal generation circuit, for exporting described second drive singal, with control the second LED group bright/go out; And
Between described signal input part and described internal state memory, be provided with negative pressure clamp circuit, for the negative pressure signal of signal input part described in filtering.
In LED switch color-temperature regulating controller of the present invention, between described negative pressure clamp circuit and described internal state memory, be provided with noise suppression circuit, for the noise of the sample detecting signal of signal input part input described in filtering.
In LED switch color-temperature regulating controller of the present invention, described negative pressure clamp circuit comprises: the first N-type metal-oxide-semiconductor, the second N-type metal-oxide-semiconductor and bias current sources; Wherein, the grid of the first N-type metal-oxide-semiconductor is connected with the grid of the second N-type, and is connected with the drain electrode of the second N-type metal-oxide-semiconductor, and the drain electrode of the first N-type metal-oxide-semiconductor is connected with accessory power supply input; Bias supply one end is connected with accessory power supply input, and the other end is connected with the drain electrode of the second N-type metal-oxide-semiconductor, to be biased the first N-type metal-oxide-semiconductor and the second N-type; 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 color-temperature regulating controller of the present invention, delay circuit is provided with between described noise suppression circuit and described internal state memory, for the transient signals change that signal input part described in filtering occurs, to avoid causing the erroneous judgement to described switch motion.
In LED switch color-temperature regulating controller of the present invention, described delay circuit comprises the counter be made up of multiple d type flip flop.
In LED switch color-temperature regulating controller of the present invention, described LED switch color-temperature regulating 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: construct a kind of LED drive circuit, for control two groups of LED groups of different-colour bright/state of going out, described LED drive circuit comprises: DC constant flowing power, LED switch color-temperature regulating controller as above and the first driving switch pipe and the second driving switch pipe; Wherein
The signal input part of LED switch color-temperature regulating controller is connected to the sampling node of DC constant flowing power outlet side by sample circuit;
The power input of LED switch color-temperature regulating controller is connected to the output of DC constant flowing power by power supply current-limiting resistance;
First drive singal output of LED switch color-temperature regulating controller connects the control end of described first driving switch pipe, and the first LED group positive pole is connected to the output of DC constant flowing power, and the negative pole of the first LED group is by the first driving switch pipe ground connection;
Second drive singal output of LED switch color-temperature regulating controller connects the control end of described second driving switch pipe, and the second LED group positive pole is connected to the output of DC constant flowing power, and the negative pole of the second LED group is by the second driving switch pipe ground connection.
In LED drive circuit of the present invention, comprise the accumulator as external auxiliary power supply, for powering for described LED switch color-temperature regulating controller in the predetermined time interval after the switch cutoff of described DC constant flowing power, to keep the current LED group driving condition in the internal state memory of LED switch color-temperature regulating controller.
In LED drive circuit of the present invention,
Described DC constant flowing power is flyback constant-current supply, and described sampling node is the Same Name of Ends of transformer secondary coil in flyback constant-current supply;
Described accumulator is storage capacitor, described storage capacitor one end ground connection, the accessory power supply input of LED switch color-temperature regulating controller described in another termination;
Described sample circuit is sampling current-limiting resistance.
In LED drive circuit of the present invention,
Described DC constant flowing power is step-down constant current power supply, and described sampling node is the drain electrode of step-down constant current power supply breaker in middle pipe;
Described accumulator is storage capacitor, described storage capacitor one end ground connection, the accessory power supply input of LED switch color-temperature regulating controller described in another termination;
Described sample circuit is sampling resistor.
Implement the present invention and there is following beneficial effect: owing to adopting DC constant flowing power to be that LED group is powered, and the sampling node of DC constant flowing power on off state is arranged on the outlet side of DC constant flowing power, thus sample detecting circuit is without the need to the rectification of high voltage bearing components and parts and complexity and filter circuit, LED switch color-temperature regulating control circuit structure is simplified, is conducive to the cost, the reduction volume that reduce LED drive circuit.In actual applications, for the lighting such as bulb lamp and shot-light, volume and cost are vital.
Accompanying drawing explanation
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 switch color-temperature regulating of prior art;
Fig. 2 is the voltage oscillogram at the LED drive circuit interior joint 100 shown in Fig. 1 and node 105 place;
Fig. 3 is the circuit theory diagrams that the present invention has LED drive circuit first embodiment of switch color-temperature regulating 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 color-temperature regulating of LED switch shown in Fig. 4 control chip;
Fig. 6 A is the circuit theory diagrams of the first delay circuit in the color-temperature regulating of LED switch shown in Fig. 4 control chip;
Fig. 6 B is the circuit theory diagrams of the second delay circuit in the color-temperature regulating of LED switch shown in Fig. 4 control chip;
Fig. 7 is the timing waveform of LED drive circuit shown in Fig. 3;
Fig. 8 is the circuit theory diagrams that the present invention has LED drive circuit second embodiment of switch color-temperature regulating function.
Embodiment
The present invention proposes a kind of brand-new LED colour temperature regulation scheme, LED switch color-temperature regulating control circuit wherein (comprising LED switch color-temperature regulating controller or control chip and peripheral circuit) can be applied to the LED drive circuit of being powered by DC constant flowing power, such as can be applicable to the LED drive circuit of being powered by flyback constant-current supply, also can be applicable to the LED drive circuit of being powered by the constant-current supply of decompression mode.
LED drive circuit of the present invention for control two groups of LED groups of different-colour bright/state of going out.LED drive circuit comprises: DC constant flowing power, LED switch color-temperature regulating controller and the first driving switch pipe and the second driving switch pipe; Wherein the signal input part of LED switch color-temperature regulating controller is connected to the sampling node of DC constant flowing power outlet side by sample circuit; The power input of LED switch color-temperature regulating controller is connected to the output of DC constant flowing power by power supply current-limiting resistance; First drive singal output of LED switch color-temperature regulating controller connects the control end of the first driving switch pipe, and the first LED group positive pole is connected to the output of DC constant flowing power, and the negative pole of the first LED group is by the first driving switch pipe ground connection; Second drive singal output of LED switch color-temperature regulating controller connects the control end of the second driving switch pipe, and the second LED group positive pole is connected to the output of DC constant flowing power, and the negative pole of the second LED group is by the second driving switch pipe ground connection.As preferably, LED drive circuit of the present invention also comprises the accumulator as external auxiliary power supply, for powering for LED switch color-temperature regulating controller in the predetermined time interval after the switch cutoff of DC constant flowing power, to keep the current LED group driving condition in the internal state memory of LED switch color-temperature regulating controller.
Below in conjunction with Fig. 3 to Fig. 7, the first embodiment of the present invention is described.
As shown in Figure 3, the LED drive circuit that the present invention has a switch color-temperature regulating function comprises flyback constant-current supply 30 and LED switch color-temperature regulating control circuit.LED switch color-temperature regulating control circuit is directly connected to the output (namely exporting the negative pole of rectifier diode 308) of flyback constant-current supply.
This flyback constant-current supply is made up of control chip 317, switching tube 318, transformer 303, output rectifier diode 308 and current sampling resistor 319, wherein, the different name end of transformer 303 primary coil is connected with AC power 300 by rectifier bridge 302, input switch 301, the drain electrode of the Same Name of Ends connecting valve pipe 318 of transformer 303 primary coil.
LED switch color-temperature regulating control circuit mainly comprise LED switch color-temperature regulating control chip 309, sampling current-limiting resistance 305, power supply current-limiting resistance 310, power supply storage capacitor 307 and control respectively LED group 312 and 315 bright/the first driving switch pipe 313 and the second driving switch pipe 316 of going out.Sampling current-limiting resistance 305 one end is connected with the Same Name of Ends (i.e. sampling node) 304 of transformer 303 secondary coil, and the other end is connected with the signal input part (i.e. pin clk) of LED switch color-temperature regulating control chip 309.Power supply one end of current-limiting resistance 310 is connected with the output (namely exporting the negative pole of rectifier diode 308) of flyback constant-current supply, and the other end is connected with the main power source input (i.e. pin vcc) of LED switch color-temperature regulating control chip 309.The control end of the first driving switch pipe 313 and the second driving switch pipe 316 is connected with the first drive singal output (i.e. pin L1) of control chip 309 and the second drive singal output (i.e. pin L2) respectively, collector electrode is connected with LED group 312 and 315 respectively, and emitter is all connected with the ground wire exported.Power supply storage capacitor 307 one end ground connection, the accessory power supply input (i.e. pin vdd) of another termination LED switch color-temperature regulating control chip.
In the present embodiment, to be sampled the short circuit or open circuit that judge input switch 301 by the signal of the Same Name of Ends (sampling node) 304 to transformer 303.In operating process, control chip 309 is sampled by the waveform of the sampling current-limiting resistance 305 pairs of sampling node 304 be connected with sampling node 304 with its pin clk, thus judge that input switch 301 is short-circuit condition or open-circuit condition, and constantly change the state of control chip 309 internal state memory according to the short/open state variation of input switch 301, the on off state that the corresponding driving switch pipe 313 and 316 of states different in last internal state memory is different.The switch of driving switch pipe 313 and 316 is along with the short circuit of input switch 301 or continuous circulation change of opening a way, and such as, in a period of change, switching tube 313 is opened, and switching tube 316 is closed; Then be that switching tube 313 is closed, and switching tube 316 is opened; Be finally two switching tubes be all opening.As preferably, internal state memory can be realized by counter.As selection, internal state memory can also be realized by rest-set flip-flop, band EEPROM (Electrically Erasable Programmable Read Only Memo) or flash storage etc.
As shown in Figure 4, according to an embodiment, the LED switch color-temperature regulating control chip 309 in the LED drive circuit shown in Fig. 3 is provided with main power source input vcc, accessory power supply input vdd, signal input part clk, the first drive singal output L1, the second drive singal output L2, earth terminal gnd; And in-line power circuit 401, negative pressure clamp circuit 400, noise suppression circuit 402, delay circuit 403, internal state memory 404 and drive signal generation circuit 405.
Wherein, in operation, in-line power circuit 401 for connecting main power source input vcc and accessory power supply input vdd, to provide working power for LED switch color-temperature regulating control chip; Signal input part clk is used for the sampling node being connected DC constant flowing power by external sampling circuit (current-limiting resistance 305 of such as sampling), to receive the sample detecting signal of the input switch action about DC constant flowing power; Internal state memory 404 is for changing according to sample detecting signal cycle and storing LED group driving condition; Negative pressure clamp circuit 400 is arranged between signal input part clk and internal state memory 404, for the negative pressure signal of filtered signal input clk.Drive signal generation circuit 405 produces the first drive singal and the second drive singal for the current LED group driving condition stored according to internal state memory; First drive singal output L1 is connected to drive signal generation circuit, for exporting the first drive singal, with control the first LED group bright/go out; Second drive singal output L2 is connected to drive signal generation circuit, for exporting the second drive singal, with control the second LED group bright/go out; And noise suppression circuit is arranged between negative pressure clamp circuit 400 and internal state memory 404, for the noise of the sample detecting signal that filtered signal input clk inputs.Delay circuit 403 is arranged between noise suppression circuit and internal state memory 404, for the transient signals change that filtered signal input clk occurs, changes to avoid transient signals the erroneous judgement to switch motion caused.
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 integrated circuit (IC) chip, the LED switch color-temperature regulating controller that also can be made up of discrete elements substitutes.
In the first embodiment of LED drive circuit of the present invention, because the waveform 702 of the Same Name of Ends (sampling node) 304 of transformer 303 secondary coil exists very high negative pressure, if do not carry out clamper to negative pressure, then can cause damage to control chip 309 inner member.In order to carry out clamper to negative pressure, control chip inside arranges negative pressure clamp circuit 400 specially.As shown in Figure 5, negative pressure clamp circuit comprises: the first N-type metal-oxide-semiconductor 501, second N-type metal-oxide-semiconductor 502 and bias current sources 503; Wherein, the grid of the first N-type metal-oxide-semiconductor 501 is connected with the grid of the second N-type 502, and is connected with the drain electrode of the second N-type metal-oxide-semiconductor 502, and the drain electrode of the first N-type metal-oxide-semiconductor 501 is connected with accessory power supply input vdd; Bias supply one end is connected with accessory power supply input vdd, and the other end is connected with the drain electrode of the second N-type metal-oxide-semiconductor 502, to be biased the first N-type metal-oxide-semiconductor 501 and the second N-type 502; The source electrode of the first N-type metal-oxide-semiconductor 501 is connected to signal input part clk, the source ground of the second N-type metal-oxide-semiconductor 502.
Because bias current sources 503 electric current is very little, so metal-oxide-semiconductor 501 and 502 is all biased to weak conducting state.When there is negative pressure in pin clk place, the gate source voltage of metal-oxide-semiconductor 501 increases, it is made to enter the state of conducting, the electric current I c flowed out through metal-oxide-semiconductor 501 and pin clk increases, this electric current produces a pressure reduction Vc after over-sampling current-limiting resistance 305, for the negative pressure that compensating sampling node 304 occurs, ensure that and there will not be negative pressure at the voltage of control chip 309 pin clk.Internal signal clkb is the signal of sample detecting signal after negative pressure clamp circuit that pin clk receives, and the part of negative pressure is by filtering, and this signal is input to the noise suppression circuit of control chip inside.
Fig. 7 is the timing waveform of LED drive circuit shown in Fig. 3, wherein,
Waveform 700: representative be the open and closed of input switch 301;
Waveform 701: representative be the input signal of rectifier bridge 302;
Waveform 702: the signal at secondary coil Same Name of Ends (i.e. sampling node) 304 place of transformer 303;
Waveform 703: representative be the output signal of delay circuit 403, that is the id signal of control chip inside;
Waveform 704: representative be the triggering signal of the transformation of the state for trigger internal status register that internal state memory 404 inside produces according to the trailing edge of signal 703;
Waveform 705 and 706: representative be internal state signal.
As can be seen from Figure 7, when input switch 301 short circuit (switch closes), the waveform 702 of a similar square wave is there will be in the sampling node 304 of transformer 303, this waveform maximum is positive, and minimum value is negative, its positive maximum is the positive bias-voltage that output voltage adds rectifier diode 308, and the absolute value of minimum value is the turn ratio that input voltage is multiplied by transformer 303.When input switch 301 opens a way (switch cutoff), control chip 309 quits work, the waveform at node 304 place disappears, control chip 309 just can by sample and the existence detecting this waveform whether, thus judge that input switch 301 is in short-circuit condition or open-circuit condition.When the waveform duration at sampling node 304 place is more than Td1, then control chip 309 just thinks input switch 301 short circuit, the id signal 703 of control chip inside becomes 1 from state 0, when the waveform in sampling node 304 disappears, and place continues the time of Td2, then control chip 309 just thinks that input switch 301 is opened a way, and the id signal 703 of control chip inside becomes 0 from state 1, occurs a trailing edge.Control chip 309 is exactly the state according to continuous varying cyclically oneself inside of the id signal 703 of control chip inside, when the trailing edge of id signal 703 of control chip inside being detected, just changes the state of an internal state memory.Why control chip 309 adds Td1 and Td2 time of delay by delay circuit 403, because in actual applications, often there will be flyback constant-current supply after input switch 301 is opened a way, because the high-voltage capacitance after rectification is (between the output and ground wire of rectifier bridge 302, not shown in Fig. 3) still there is electricity, this electricity enough makes flyback current constant control chip 317 restart once, waveform is there is in sampling node 304, because input switch disconnects, the electricity of high-voltage capacitance is discharged soon, so the operating time is very short, control chip 309 must carry out filtering to this situation, otherwise state can be caused chaotic.In order to restart situation after this shutdown of filtering, control chip 309 by delay circuit 403 add one time of delay Td1, namely the waveform at sampling node 304 place of transformer secondary coil must occur that the time of at least Td1 just can be regarded as input switch 301 short circuit continuously, otherwise is considered as misoperation.Td2 is that the voltage in high-voltage capacitance may support power work not in order to avoid when the lowest point of alternating current, and occur that of short duration switch stops, waveform 702 disappears, and causes the erroneous judgement of control chip 309.Can avoid control chip 309 that the shutoff of input switch is thought in stopping temporary transient for clk by delay circuit 403, because particularly in the circuit of band power factor emendation function, when the lowest point of input signal, because operating voltage there will be the of short duration stopping of clk not.
In LED switch color-temperature regulating control chip of the present invention, delay circuit comprises the first delay circuit and the second delay circuit, for the transient signals change that filtered signal input (clk) occurs, to avoid causing the erroneous judgement to switch motion.Below in conjunction with Fig. 6 A and 6B illustrated embodiment, the embodiment of delay circuit is described.It should be noted that, the delay circuit in the present invention is not limited to this embodiment, knows as is known to the person skilled in the art, and other modes also can be adopted to realize this delay circuit, such as: the method adopting RC to postpone realizes.
Fig. 6 A is the circuit theory diagrams of the first delay circuit in the color-temperature regulating of LED switch shown in Fig. 4 control chip, first delay circuit is used for occurring that square-wave signal (such as input switch 301 short circuit) starts when signal input part (clk), after the time delay Td1 time interval, export for confirming the signal that square-wave signal occurs, namely now id signal 703 square wave becomes high level and rising edge from low level.
Fig. 6 B is the circuit theory diagrams of the second delay circuit in the color-temperature regulating of LED switch shown in Fig. 4 control chip; Second delay circuit is used for starting when signal input part (clk) square-wave signal (such as input switch 301 is opened a way) disappears, after the time delay Td2 time interval, export for confirming the signal that square-wave signal disappears, namely now id signal 703 square wave becomes low level and trailing edge from high level.
As shown in Figure 6A, the first delay circuit (i.e. Td1 delay circuit) forms primarily of reset signal generating circuit sum counter.Wherein reset signal generating circuit is made up of MOSFET 600, resistance 601, electric capacity 603 and NAND gate 602, and counter is made up of d type flip flop.M d type flip flop 604 ~ 605 forms cycle counter, and 2 d type flip flops 606 and 607 form shift counter, and wherein, the value of M determines the duration of Td1.The output of cycle counter is input to the clock signal pin position clk of shift counter as the clock signal of shift counter.One end of resistance 601 is connected with internal electric source vdd, one end is connected with the drain electrode of MOSFET600 in addition, the source electrode of MOSFET 600 is connected to ground wire, the drain electrode of MOSFET 600 is connected as the input of output with NAND gate 602, the output of NAND gate 602 is input to the reset terminal R of d type flip flop, between the drain electrode that electric capacity 603 is connected to MOSFET 600 and ground wire as the reset signal R1 of counter.Cycle counter is made up of M d type flip flop, the reset terminal of d type flip flop is all connected with the output signal R1 of reset signal generating circuit, the D end of previous d type flip flop is connected with Q-and is connected with the clk pin of a rear d type flip flop, the clk of first d type flip flop 604 is connected with internal signal clkb signal, and the Q-of last trigger 605 is connected with the clock pins clk of shift counter as output.D type flip flop 606 in shift counter with 607 reset pin R and R1 be connected, d type flip flop 606 is connected with the Q-of the d type flip flop 605 in cycle counter with the clock pins clk of 607, the D pin of d type flip flop 606 is connected with internal electric source vdd, its Q pin is connected with the D pin of d type flip flop 607, and the Q pin of d type flip flop 607 is the output of whole Td1 delay circuit.
The operation principle of the first delay circuit is: when clkb signal does not occur, also namely clkb is low level, MOSFET 600 is in off state, electric capacity 603 is charged by resistance 601, when the threshold voltage that the voltage at electric capacity two ends overturns higher than NAND gate 602, the output R1 of reset signal generating circuit is low level, and this low level resets to the d type flip flop in counter, so the output of counter, also namely the Q end of d type flip flop 607 is low level.
When there is square-wave signal in clkb, MOSFET 600 each cycle discharges to electric capacity 603, also namely the input terminal voltage of NAND gate 602 cannot reach the threshold voltage of the upset of NAND gate, so the output signal R1 of NAND gate is that high point is flat, due to the reset signal that signal R1 is whole counter, it is invalid that this signal resets when being high level, clkb is as the clock signal of counter simultaneously, so the cycle counter of forward part is started working, when cycle counter reaches one-period, there is a clock signal in the output of d type flip flop 605, this clock signal is as the clock of the shift counter of rear section, when clock signal occurs one time, the Q end of d type flip flop 606 becomes high level from low level, when there is second time in clock signal, the Q end of d type flip flop 607 also becomes high level from low level.The Q end counting d type flip flop 607 from square-wave signal appears in clkb becomes high level from low level, and namely this time interval is Td1.
As shown in Figure 6B, the second delay circuit (i.e. Td2 delay circuit) is made up of reset signal noise filter circuit and cycle counter.Reset signal noise filter circuit is made up of MOSFET 608, resistance 609 and electric capacity 610, one end of resistance 609 is connected with internal electric source vdd, other one end of resistance 609 is connected with the drain electrode of MOSFET 608, its node is as the output R2 of this circuit, the source electrode of MOSFET 608 is connected with ground wire, between the drain electrode that electric capacity 610 is connected to MOSFET 608 and source electrode.Cycle counter is by N number of d type flip flop 612, 613 ... 614 compositions, wherein, the value of N determines the duration of Td2, d type flip flop 612, 613 ... the reset terminal pin R of 614 is connected with the output R2 of reset signal noise filter circuit, total total N number of between d type flip flop 612 to 614, each d type flip flop pin D is connected with its pin Q-, except d type flip flop 612, the pin clk of a rear d type flip flop is connected with the pin Q-of previous trigger, the pin clk of d type flip flop 612 is connected with an inner clock signal 611, the pin Q-of d type flip flop 614 is the output of Td2 delay circuit.
The operation principle of the second delay circuit is: when the square wave of signal clkb exists, the signal R2 of this signal after reset signal noise filter circuit is also a square wave, this square wave constantly resets to the d type flip flop of counter, so output, also namely the pin Q-of d type flip flop 614 is high level.
When the square wave of signal clkb disappears, also when namely clkb is electronegative potential, MOSFET 608 is in the state of shutoff, electric capacity 610 is charged by resistance 609, output R2 is high level, this high level makes the reset of d type flip flop lose efficacy, and cycle counter, under the driving of internal clock signal 611, counts.When cycle counter reaches one-period, the output of Td2 delay circuit, namely the level of the pin Q-of d type flip flop 614 becomes low level from high level, and disappearing from the square-wave signal of clkb, to become the low time to the level of the pin Q-of d type flip flop 614 from height be Td2 time of delay.
In addition, during input switch 301 is opened a way, control chip 309 quits work, control chip 309 cannot be powered by power supply current-limiting resistance 310, but in a period of time (being generally 3 seconds) after input switch 301 is opened a way, the state of the status register of control chip inside must be maintained, and another one auxiliary power supply also namely during this period of time must be had to originate.In LED drive circuit of the present invention, introduce accumulator, as external auxiliary power supply, to power for LED switch color-temperature regulating controller in the predetermined time interval after the switch cutoff of DC constant flowing power, to keep the current LED group driving condition in the internal state memory of LED switch color-temperature regulating controller.Such as, adopt power supply storage capacitor 307, this electric capacity is exactly to power to control chip in several seconds after input switch 301 open circuit, keeping the state of internal state memory.This electric capacity is filled electricity during input switch 301 short circuit, during input switch 301 is opened a way, electric capacity 307 discharges, simultaneously in order to keep the time more grown, during input switch 301 is opened a way, the operating current of control chip can be reduced to about 1uA at once, and the retention time can be adjusted by the size changing storage capacitor 307.
LED switch color-temperature regulating controller of the present invention, not only can be directly used in the flyback constant-current supply of isolation, can also be directly used in the buck configuration of non-isolated, as shown in Figure 8.Step-down constant current power supply 80 comprises control chip 800, switching tube 801, current sampling resistor 802 and rectifier diode 803, and step-down constant current power supply 80 connects AC power by diode, input switch.
As shown in Figure 8, in the second embodiment of the present invention, in LED drive circuit, the pin clk of LED switch color-temperature regulating control chip 806 is connected with the drain electrode (i.e. sampling node) of step-down constant current power supply 80 breaker in middle pipe 801 by sampling resistor 805, be connected with one end of inductor 804, inductor 804 other end ground connection simultaneously.Pin L1 with L2 of control chip 806 is connected with the control end of driving switch pipe 808 and 809 respectively, for controlling unlatching and the shutoff (i.e. on and off) of LED group 810 and 811 respectively.Power supply one end of current-limiting resistance 807 is connected with the positive pole (i.e. the negative pole of rectifier diode 803) of output, and one end is connected with the pin vcc of control chip 806 in addition, for powering to control chip 806.Storage capacitor 812 one end is connected with the pin vdd of control chip 806, and the other end is connected with the ground wire of output.
According to one embodiment of the invention, LED drive circuit comprises the switching tube of LED switch color-temperature regulating control chip, sampling current-limiting resistance, power supply current-limiting resistance, storage capacitor and two control different-colour LED.Sampling current-limiting resistance one end is connected with the transformer secondary output winding of flyback constant-current supply, the other end is connected with the pin clk of LED switch color-temperature regulating control chip, one end of power supply current-limiting resistance is connected with the output cathode of flyback constant-current supply, the other end is connected with the pin vcc of LED switch color-temperature regulating control chip, storage capacitor is connected with the pin vdd of LED switch color-temperature regulating control chip, and the switch controlled end of control LED is connected with the output of LED switch color-temperature regulating control chip respectively.
Detected transformer secondary output winding output by sampling current-limiting resistance in this LED drive circuit, when waveform appears in this node, and the duration is more than the time of a setting, just thinks input switch short circuit; When the waveform of this node disappears, and the duration is more than the time of a setting, just thinks that input switch is opened a way.LED switch color-temperature regulating control chip to be detected transformer output by this sampling current-limiting resistance thus judges the action of input switch, and then controls internal state.
Powered to LED switch color-temperature regulating control chip by power supply current-limiting resistance in this LED drive circuit, the electric current part that this resistance provides is for the normal work of LED switch color-temperature regulating control chip, and a part is used for charging to storage capacitor in addition.
In this LED drive circuit, storage capacitor is used for powering to LED switch color-temperature regulating control chip when input switch is opened a way, to keep the state of LED switch color-temperature regulating control chip inside.Due to when input switch is opened a way, the operating current of LED switch color-temperature regulating control chip has dropped to about 1uA, so the time that the state that can be adjusted by the size changing storage capacitor is kept.
In this LED drive circuit, driving switch pipe, uses except cost consideration except triode, when output current is larger, MOSFET also can be used to replace.
LED switch color-temperature regulating control chip of the present invention not only may be used for, in the constant-current supply of isolating, also may be used in the constant-current control circuit of decompression mode.According to another embodiment of the present invention, the pin clk of LED switch color-temperature regulating control chip is connected with one end of inductor in step-down constant current power supply by sampling resistor.LED switch color-temperature regulating control chip output is connected with switch controlled end.One end of power supply current-limiting resistance is connected with the positive pole that step-down constant current power supply exports, and one end is connected with the pin vcc of LED switch color-temperature regulating control chip in addition.Storage capacitor one end is connected with the pin vdd of LED switch color-temperature regulating control chip, and the other end is connected with the ground wire of output.
Above embodiment, only for technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement accordingly, can not limit the scope of the invention.All equalizations done with the claims in the present invention scope change and modify, and all should belong to the covering scope of the claims in the present invention.
Claims (10)
1. a LED switch color-temperature regulating controller, for two groups of LED groups controlling to be powered by DC constant flowing power bright/go out, it is characterized in that, described LED switch color-temperature regulating controller comprises:
Main power source input (vcc), for connecting external dc constant-current supply;
Accessory power supply input (vdd), for connecting external auxiliary power supply;
In-line power circuit (401), is connected to described main power source input (vcc) and described accessory power supply input (vdd), for providing working power for described LED switch color-temperature regulating controller;
Signal input part (clk), for connecting the sampling node (304) of DC constant flowing power outlet side, receiving the sample detecting signal of the switch motion about described DC constant flowing power by external sampling circuit;
Internal state memory (404), for changing according to described sample detecting signal cycle and storing LED group driving condition;
Drive signal generation circuit (405), for producing the first drive singal and the second drive singal according to current LED group driving condition;
First drive singal output (L1), is connected to described drive signal generation circuit, for exporting described first drive singal, with control the first LED group bright/go out;
Second drive singal output (L2), is connected to described drive signal generation circuit, for exporting described second drive singal, with control the second LED group bright/go out; And
Between described signal input part (clk) and described internal state memory, be provided with negative pressure clamp circuit (400), for the negative pressure signal of signal input part described in filtering (clk).
2. LED switch color-temperature regulating controller according to claim 1, it is characterized in that, noise suppression circuit (402) is provided with, for the noise of the sample detecting signal that signal input part described in filtering (clk) inputs between described negative pressure clamp circuit and described internal state memory.
3. LED switch color-temperature regulating controller according to claim 1, is characterized in that, described negative pressure clamp circuit comprises: the first N-type metal-oxide-semiconductor (501), the second N-type metal-oxide-semiconductor (502) and bias current sources (503); Wherein, the grid of the first N-type metal-oxide-semiconductor (501) is connected with the grid of the second N-type (502), and be connected with the drain electrode of the second N-type metal-oxide-semiconductor (502), the drain electrode of the first N-type metal-oxide-semiconductor (501) is connected with accessory power supply input (vdd); Bias supply one end is connected with accessory power supply input (vdd), and the other end is connected with the drain electrode of the second N-type metal-oxide-semiconductor (502), to be biased the first N-type metal-oxide-semiconductor (501) and the second N-type (502); The source electrode of the first N-type metal-oxide-semiconductor (501) is connected to signal input part (clk), the source ground of the second N-type metal-oxide-semiconductor (502).
4. LED switch color-temperature regulating controller according to claim 2, it is characterized in that, delay circuit (403) is provided with between described noise suppression circuit (402) and described internal state memory (404), for the transient signals change that signal input part described in filtering (clk) occurs, to avoid causing the erroneous judgement to described switch motion.
5. LED switch color-temperature regulating controller according to claim 4, is characterized in that, described delay circuit (403) comprises the counter be made up of multiple d type flip flop.
6. LED switch color-temperature regulating controller according to any one of claim 1 to 5, is characterized in that, described LED switch color-temperature regulating controller is integrated circuit LED switch color-temperature regulating control chip.
7. a LED drive circuit, for control two groups of LED groups of different-colour bright/state of going out, it is characterized in that, described LED drive circuit comprises: DC constant flowing power, LED switch color-temperature regulating controller according to any one of claim 1 to 6 and the first driving switch pipe and the second driving switch pipe; Wherein
The signal input part (clk) of LED switch color-temperature regulating controller is connected to the sampling node (304) of DC constant flowing power outlet side by sample circuit;
The power input (vcc) of LED switch color-temperature regulating controller is connected to the output of DC constant flowing power by power supply current-limiting resistance (310,807);
First drive singal output (L1) of LED switch color-temperature regulating controller connects the control end of described first driving switch pipe, and the first LED group positive pole is connected to the output of DC constant flowing power, the negative pole of the first LED group is by the first driving switch pipe ground connection;
Second drive singal output (L2) of LED switch color-temperature regulating controller connects the control end of described second driving switch pipe, and the second LED group positive pole is connected to the output of DC constant flowing power, the negative pole of the second LED group is by the second driving switch pipe ground connection.
8. LED drive circuit according to claim 7, it is characterized in that, comprise the accumulator as external auxiliary power supply, for powering for described LED switch color-temperature regulating controller in the predetermined time interval after the switch cutoff of described DC constant flowing power, to keep the current LED group driving condition in the internal state memory of LED switch color-temperature regulating controller.
9. LED drive circuit according to claim 8, is characterized in that,
Described DC constant flowing power is flyback constant-current supply, and described sampling node is the Same Name of Ends of transformer (303) secondary coil in flyback constant-current supply;
Described accumulator is storage capacitor (307), described storage capacitor (307) one end ground connection, the accessory power supply input (vdd) of LED switch color-temperature regulating controller described in another termination;
Described sample circuit is sampling current-limiting resistance (305).
10. LED drive circuit according to claim 8, is characterized in that,
Described DC constant flowing power is step-down constant current power supply, and described sampling node is the drain electrode of step-down constant current power supply breaker in middle pipe (801);
Described accumulator is storage capacitor (812), described storage capacitor (812) one end ground connection, the accessory power supply input (vdd) of LED switch color-temperature regulating controller described in another termination;
Described sample circuit is sampling resistor (805).
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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. |