CN204836696U - Constant -current drive circuit that LED lamp can be adjusted luminance - Google Patents
Constant -current drive circuit that LED lamp can be adjusted luminance Download PDFInfo
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- CN204836696U CN204836696U CN201520581678.3U CN201520581678U CN204836696U CN 204836696 U CN204836696 U CN 204836696U CN 201520581678 U CN201520581678 U CN 201520581678U CN 204836696 U CN204836696 U CN 204836696U
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Abstract
The utility model relates to a constant -current drive circuit that LED lamp can be adjusted luminance, include the DC -DC reduction voltage circuit that becomes by switch element, diode D1, inductance L1 and LED banks to and rectifier bridge circuit B1, constant -current drive circuit that LED lamp can be adjusted luminance still includes voltage testing and regulation and control circuit, the output both ends at rectifier bridge circuit B1 are connected to the voltage testing electricity, regulation and control circuit and voltage testing and switch element be electric the connection mutually, should regulate and control circuit receipt voltage testing's output voltage, through this output voltage of analysis, comes the input voltage vi at real -time supervision DC -DC reduction voltage circuit both ends to calculation reachs switch element's turn -on time TH and cut off time TL, controls switch element's the ratio to the cut off time that switches on, thereby makes the electric current of drive LED lamp keep invariable. The utility model discloses constant -current drive circuit have circuit structure simple, with low costs, adjust luminance easily and advantage such as safe and reliable.
Description
[
technical field]
The utility model relates to the circuit arrangement for general electric light source, particularly relates to power supply circuits and the control device thereof of LED, especially relates to the constant-current drive circuit of LED tunable optical.LED of the present utility model is the abbreviation of English LightEmittingDiode, and Chinese is meant to " light-emitting diode ".
[
background technology]
In recent years, LED is as a kind of energy saving environmental protection product, and application is more and more extensive, such as, for general lighting, mark and signal, and for the backlight etc. of display floater and video screen.LED drive circuit is used to provide power supply to LED.
The characteristic of LED is that requirement constant current drives, and LED lamp drive circuit comprises isolation constant-current drive circuit and non-isolated constant-current drive circuit, and non-isolated constant-current drive circuit, because efficiency is high, cost is low and integrated level is high, has very large advantage in low-power LED lamp application.
See Figure 10, this figure is that typical DC-DC reduction voltage circuit (is also Buck change-over circuit, LED in this circuit diagram can be single led, also can be multiple LED strip connection, or in parallel again after multiple LED strip connection), this DC-DC reduction voltage circuit comprises switch element, diode D1, inductance L 1 and LED, changes ON time or the deadline of switch element, can change the electric current flowing through LED; And releasing energy of deadline and inductance L 1 is relevant, the fault offset that must fill in inductance L 1 to close to zero time, at this moment open switch element, the loss of switch element is just smaller, Here it is the lowest point switching mode.
See Figure 11, the non-isolated constant-current drive circuit of prior art LED lamp drive circuit is adopt the sample voltage of series resistance R99 of LED of comparator 99 carry out control switch element Q99 by logic control circuit 98 and reach the object of constant current substantially; Although the easily constant current of this non-isolated constant-current drive circuit, light modulation, must add light adjusting circuit, cause cost to increase; To can intelligent dimming be realized, also must add the more expensive intelligent chip of price, i.e. programmable integrated circuit, cause cost to increase; And the power factor (PF) of this non-isolated constant-current drive circuit in civil power is lower, improve power factor (PF), power factor correction circuit (such as filling out paddy circuit) must be increased, cost also can be caused to increase.
See Figure 11, the input of the non-isolated constant-current drive circuit of prior art LED lamp drive circuit generally adopts urban electricity supply (abbreviation civil power), behind commercial power rectification, the cycle is generally 100 hertz, voltage after rectification is generally the direct current not stopping change from zero to 300 volts, the voltage difference of its crest voltage and LED is larger, can reach more than hectovolt, due to the voltage fluctuation of utility grid, its crest voltage also follows fluctuation, the inductance L 1 that currently available technology LED drives is generally milihenry rank, if control electric current by the series resistance R99 feedback of prior art, every a microsecond, electric current has no small change, if realize current constant control with the voltage of intelligent chip sampling series resistance R99, the intelligent chip reaction speed of control switch element Q99 is necessary for nanosecond rank, and intelligent chip reception storage signal wants several clock cycle, intelligent chip calculation process signal at least obtains tens clock cycle here, arrive intelligent chip output fill order again and also want several clock cycle, reach reaction speed within 100 nanoseconds, the clock frequency of intelligent chip must be greater than 100 megahertzes, in fact due to the complexity of computing, required intelligent chip clock frequency can be much higher, the clock frequency of intelligent chip is higher, energy consumption is also higher, cost is also higher simultaneously, this has very large obstacle to the application of universal intelligent chip on LED.
[
utility model content]
The constant-current drive circuit that the technical problems to be solved in the utility model is to avoid above-mentioned the deficiencies in the prior art part and provides a kind of LED tunable optical, conducting and the deadline of control switch element directly can be come with lower-cost circuit for regulating and controlling such as programmable integrated circuit, the object of constant current can be reached, external signal can also be received easily to realize intelligent dimming, have that circuit structure is simple, cost is low, light modulation is easy and the advantage such as safe and reliable.
The technical scheme that the utility model solve the technical problem employing is:
A constant-current drive circuit for LED tunable optical, comprises the DC-DC reduction voltage circuit be made up of switch element, diode D1, inductance L 1 and LED, and commercial power rectification is become the rectifier circuit B1 of pulsating direct current; The constant-current drive circuit of described LED tunable optical also comprises voltage detection module and circuit for regulating and controlling; Described voltage detection module is connected electrically in the output two ends of described rectifier circuit B1; Described circuit for regulating and controlling is electrically connected mutually with described voltage detection module and switch element, this circuit for regulating and controlling receives the output voltage signal of described voltage detection module, by analyzing this output voltage signal, carry out the input voltage Vi at DC-DC reduction voltage circuit two ends described in Real-Time Monitoring, and calculate described switch element ON time TH and deadline TL, control the ratio of conducting to deadline of described switch element, thus make the constant current hold of driving LED lamp.
The constant-current drive circuit of described LED tunable optical also comprises can receive the inductor J1 that external dimmer signaling module sends dim signal, the dim signal of reception is passed to described circuit for regulating and controlling by this inductor J1, after described circuit for regulating and controlling receives this dim signal, adjust described switch element ON time TH or deadline TL, thus make the electric current of driving LED lamp change to reach the object of light modulation.
Described voltage detection module comprises two resistance R1, R2 being cascaded, and two resistance R1, R2 of this series connection are connected electrically in the output two ends of described rectifier circuit B1; A port of described circuit for regulating and controlling is connected electrically between two resistance R1, R2.
The constant-current drive circuit of described LED tunable optical also comprises isolating diode D2 and storage capacitor C2; The anode of isolating diode D2 is connected electrically in the positive output end of described rectifier circuit B1, and the cathodic electricity of isolating diode D2 is connected to the anode tap of the LED of described DC-DC reduction voltage circuit; Between the negative electrode that storage capacitor C2 is connected electrically in isolating diode D2 and ground.
Described circuit for regulating and controlling is programmable integrated circuit, comprises programmable micro-control unit or chip microprocessor and peripheral circuit thereof.
The constant-current drive circuit of described LED tunable optical also comprises the supply module of powering for described circuit for regulating and controlling lowering and stabilizing blood pressure, and this supply module comprises dropping resistor RV, voltage stabilizing didoe DV and triode transistor Q1, and this triode transistor Q1 is field effect transistor or triode; Dropping resistor RV and voltage stabilizing didoe DV is connected electrically in the output two ends of described rectifier circuit B1 after connecting, the wherein plus earth of voltage stabilizing didoe DV, this ground is exactly the negative output terminal of described rectifier circuit B1, and dropping resistor RV connects the positive output end of described rectifier circuit B1; The grid of triode transistor Q1 or base stage are connected electrically between dropping resistor RV and voltage stabilizing didoe DV, the drain electrode of triode transistor Q1 or collector electrode are connected electrically in the positive output end of described rectifier circuit B1, and the source electrode of triode transistor Q1 or emitter are electrically connected to the power port of described circuit for regulating and controlling.
The constant-current drive circuit of described LED tunable optical also comprises inductor J1, dropping resistor RV, voltage stabilizing didoe DV and resistance R5; Described circuit for regulating and controlling is the micro-control unit U1 having eight ports; Described voltage detection module comprises two resistance R1 and R2, and resistance R1 and R2 is connected electrically in the output two ends of described rectifier circuit B1 after connecting; Described switch element is field effect transistor Q2, the grid of field effect transistor Q2 is electrically connected to first port OUT of micro-control unit U1 by resistance R5, the drain electrode of field effect transistor Q2 is electrically connected to the anode of inductance L 1 and diode D1, the source ground of field effect transistor Q2, this ground is exactly the negative output terminal of described rectifier circuit B1; Dropping resistor RV and voltage stabilizing didoe DV is connected electrically in the output two ends of described rectifier circuit B1 after connecting, the wherein plus earth of voltage stabilizing didoe DV, and dropping resistor RV connects the positive output end of described rectifier circuit B1; 5th the port VDD of micro-control unit U1 connects the common port of dropping resistor RV and voltage stabilizing didoe DV; Inductor J1 is infrared inductor, first port IR of this infrared inductor J1 is electrically connected to the 3rd the port IR of micro-control unit U1, second the port ground connection of infrared inductor J1, the 3rd port of infrared inductor J1 connects the common port of dropping resistor RV and voltage stabilizing didoe DV; 4th the port VSS ground connection of micro-control unit U1, the common port V2 of the 6th port V2 connecting resistance R1 and R2 of micro-control unit U1, second port of micro-control unit U1 and the 8th port unsettled.
Compared with the existing technology comparatively, the beneficial effect of the constant-current drive circuit of the utility model LED tunable optical is:
Owing to being provided with voltage detection module and circuit for regulating and controlling, the circuit for regulating and controlling cost adopted is lower again, such as a kind of lower-cost programmable integrated circuit, the output voltage signal of circuit for regulating and controlling receiver voltage detection module, by analyzing this output voltage signal, carry out the input voltage at Real-Time Monitoring DC-DC reduction voltage circuit two ends, and calculate ON time and the deadline of switch element, control the ratio of conducting to deadline of described switch element, thus make the constant current hold of driving LED.Therefore the utility model directly can carry out conducting and the deadline of control switch element with lower-cost circuit for regulating and controlling such as programmable integrated circuit, the object of constant current can be reached, external signal can also be received easily to realize intelligent dimming, have that circuit structure is simple, cost is low, light modulation is easy and the advantage such as safe and reliable.
[
accompanying drawing explanation]
Fig. 1 is the simple and clear electric principle block diagram of the constant-current drive circuit embodiment one of the utility model LED tunable optical;
Fig. 2 is the simple and clear electric principle block diagram of the constant-current drive circuit embodiment two of described LED tunable optical;
Fig. 3 is the simple and clear electric principle block diagram of the constant-current drive circuit embodiment three of described LED tunable optical;
Fig. 4 is the simple and clear electric principle block diagram of the constant-current drive circuit embodiment four of described LED tunable optical;
Fig. 5 is the simple and clear electric principle block diagram of the constant-current drive circuit embodiment five of described LED tunable optical;
Fig. 6 is the simple and clear electric principle block diagram of the constant-current drive circuit embodiment six of described LED tunable optical;
Fig. 7 is the simple and clear electric principle block diagram of the constant-current drive circuit embodiment seven of described LED tunable optical;
Fig. 8 is the simple and clear electric principle block diagram of the constant-current drive circuit embodiment eight of described LED tunable optical;
Fig. 9 is a kind of physical circuit schematic diagram of the constant-current drive circuit of described LED tunable optical;
Figure 10 is the electric principle block diagram of prior art DC-DC reduction voltage circuit (being also Buck change-over circuit);
Figure 11 is the electric principle schematic of the non-isolated constant-current drive circuit of prior art LED lamp drive circuit.
[embodiment]
Below in conjunction with each accompanying drawing, the utility model is described in further detail.
See Fig. 1 to Fig. 9, a kind of constant-current drive circuit of LED tunable optical, comprises the DC-DC reduction voltage circuit be made up of switch element 300, diode D1, inductance L 1 and LED, and LED is load, and commercial power rectification is become the rectifier circuit B1 of pulsating direct current; The constant-current drive circuit of described LED tunable optical also comprises voltage detection module 100 and circuit for regulating and controlling 200; Described voltage detection module 100 is connected electrically in the output two ends of described rectifier circuit B1; Described circuit for regulating and controlling 200 is electrically connected mutually with described voltage detection module 100 and switch element 300, this circuit for regulating and controlling 200 receives the output voltage signal of described voltage detection module 100, by analyzing this output voltage signal, carry out the input voltage Vi at DC-DC reduction voltage circuit two ends described in Real-Time Monitoring, and calculate described switch element 300 ON time TH and deadline TL, control the conducting of described switch element 300 to the ratio of deadline, thus make the constant current hold of driving LED lamp.
Described input voltage Vi selects as the case may be, can be to input to the crest voltage of described DC-DC reduction voltage circuit or average peak voltage or average voltage behind commercial power rectification.In a voltage wave cycle, when the fluctuation of input voltage Vi is more than or equal to 5%, after described input voltage Vi refers to commercial power rectification, input to crest voltage or the average peak voltage at described DC-DC reduction voltage circuit two ends; In a voltage wave cycle, when the fluctuation of input voltage Vi is less than 5%, the average voltage at described DC-DC reduction voltage circuit two ends is inputed to after described input voltage Vi generally can adopt commercial power rectification, input to crest voltage or the average peak voltage at described DC-DC reduction voltage circuit two ends after certain described input voltage Vi also can adopt commercial power rectification, now adopt crest voltage or average peak voltage and adopt average voltage similar.Specifically, see Fig. 1 to Fig. 7, when described DC-DC reduction voltage circuit two ends and voltage detection module 100 two ends do not have storage capacitor C2 in parallel, or see Fig. 8, when described DC-DC reduction voltage circuit two ends are parallel with storage capacitor C2, and this storage capacitor C2 is not when being connected in parallel on voltage detection module 100 two ends, or see Fig. 9, when when described DC-DC reduction voltage circuit two ends are parallel with storage capacitor C2 together with voltage detection module 100 two ends, the capacity of this storage capacitor C2 is smaller, crest voltage or the average peak voltage at described DC-DC reduction voltage circuit two ends is inputed to after described input voltage Vi refers to commercial power rectification, see Fig. 9, when when described DC-DC reduction voltage circuit two ends are parallel with storage capacitor C2 together with voltage detection module 100 two ends, the capacity of this storage capacitor C2 is enough large, the average voltage at described DC-DC reduction voltage circuit two ends is inputed to after described input voltage Vi generally can adopt commercial power rectification, input to crest voltage or the average peak voltage at described DC-DC reduction voltage circuit two ends after certain described input voltage Vi also can adopt commercial power rectification, now adopt crest voltage or average peak voltage and adopt average voltage similar.Average peak voltage is the mean value of each crest voltage of at least two voltage wave cycles, such as average peak voltage can adopt the mean value of each crest voltage of three voltage wave cycles, also the mean value of each crest voltage of four voltage wave cycles can be adopted, the mean value of each crest voltage of five voltage wave cycles can also be adopted, etc.
See Fig. 1 to Fig. 9, described circuit for regulating and controlling 200 is programmable integrated circuits, comprises programmable micro-control unit or chip microprocessor and peripheral circuit thereof; Programmable integrated circuit is also called intelligent chip sometimes.Circuit for regulating and controlling 200 comprises MCU, PLC or FPGA and peripheral circuit thereof.MCU is the abbreviation of English MicroControlUnit, and Chinese is micro-control unit, also known as one chip microcomputer (SingleChipMicrocomputer) or single-chip microcomputer.PLC is the abbreviation of English ProgrammableLogicController, and Chinese is programmable logic controller (PLC).FPGA(is the abbreviation of English Field-ProgrammableGateArray, and Chinese is field programmable gate array, is called for short programmable gate array.
Less demanding to circuit for regulating and controlling 200 described in the utility model, described circuit for regulating and controlling 200 only needs an A/D input port (i.e. analog/digital conversion input port), (a common input port is used for detecting infrared signal two common input ports, another common input port is used for detecting the mains switch time), a PWM output port, just can realize the constant current driving method of the utility model LED tunable optical and the function of circuit, therefore the cost compare of circuit for regulating and controlling 200 described in the utility model is low.Can reach this requirement than if any the MCU of a lot of 8, such as ATMEL(likes special Mel) company's model of producing is the MCU of atmega88, the model that the company of Yilong Electric ELECTRONICS CO LTD of TaiWan, China produces is the MCU of EM78P259, etc.PWM is the abbreviation of English PulseWidthModulation, and Chinese is pulse width modulation, is called for short pulse-width modulation.
See Fig. 2 and Fig. 5 to Fig. 9, the constant-current drive circuit of described LED tunable optical also comprises can receive the inductor J1 that external dimmer signaling module sends dim signal, the dim signal of reception is passed to described circuit for regulating and controlling 200 by this inductor J1, after described circuit for regulating and controlling 200 receives this dim signal, adjust described switch element 300 ON time TH or deadline TL, thus make the electric current of driving LED lamp change to reach the object of light modulation.
See Fig. 3 to Fig. 9, described voltage detection module 100 comprises two resistance R1, R2 being cascaded, and two resistance R1, R2 of this series connection are connected electrically in the output two ends of described rectifier circuit B1; A port of described circuit for regulating and controlling 200 is connected electrically between two resistance R1, R2.
See Fig. 8 and Fig. 9, the constant-current drive circuit of described LED tunable optical also comprises isolating diode D2 and storage capacitor C2; The anode of isolating diode D2 is connected electrically in the positive output end of described rectifier circuit B1, and the cathodic electricity of isolating diode D2 is connected to the anode tap of the LED of DC-DC reduction voltage circuit; Between the negative electrode that storage capacitor C2 is connected electrically in isolating diode D2 and ground.Like this when electric main zero passage, storage capacitor C2 can also provide electric energy to LED.
See Fig. 6 to Fig. 8, the constant-current drive circuit of described LED tunable optical also comprises the supply module of powering to described circuit for regulating and controlling 200 lowering and stabilizing blood pressure, this supply module comprises dropping resistor RV, voltage stabilizing didoe DV and triode transistor Q1, and this triode transistor Q1 is field effect transistor or triode; Dropping resistor RV and voltage stabilizing didoe DV is connected electrically in the output two ends of described rectifier circuit B1 after connecting, the wherein plus earth of voltage stabilizing didoe DV, this ground is exactly the negative output terminal of described rectifier circuit B1, and dropping resistor RV connects the positive output end of described rectifier circuit B1; The grid of triode transistor Q1 or base stage are connected electrically between dropping resistor RV and voltage stabilizing didoe DV, the drain electrode of triode transistor Q1 or collector electrode are connected electrically in the positive output end of described rectifier circuit B1, and the source electrode of triode transistor Q1 or emitter are electrically connected to the power port of described circuit for regulating and controlling 200.
See Fig. 1 to Fig. 9, the drive current of described LED keep constant while, described switch element 300 is operated in the lowest point switching mode; The lowest point switching mode be the fault offset that inductance L 1 is filled to close to zero time, at this moment open switch element 300, the loss of switch element 300 is just smaller.
See Fig. 2 and Fig. 5 to Fig. 9, described circuit for regulating and controlling 200 also receives dim signal 400, adjust described switch element 300 ON time TH or deadline TL, thus make the electric current of driving LED lamp change to reach the object of light modulation.The command voltage signal that dim signal 400 comprises infrared signal, wireless module signal or directly inputs.
See Fig. 1 to Fig. 9, the ON time TH of described switch element 300 calculates according to following empirical equation, TH=I*L/ (Vi-Vd), wherein I is the peak current of inductance L 1, unit is ampere, L is the inductance value of inductance L 1, unit is prosperous, Vi is the input voltage at described DC-DC reduction voltage circuit two ends, unit is volt, this input voltage Vi selects as the case may be, can be behind commercial power rectification, input to the crest voltage at described DC-DC reduction voltage circuit two ends or average peak voltage or average voltage, Vd is the conducting voltage of described LED, unit is volt, the unit of ON time TH is second.
See Fig. 1 to Fig. 9, TL deadline of described switch element 300 calculates according to following empirical equation, TL >=I*L/Vd, wherein I is the peak current of inductance L 1, and unit is ampere, and L is the inductance value of inductance L 1, unit is prosperous, Vd is the conducting voltage of described LED, and unit is volt, and deadline, the unit of TL was second.
When LED is single led, the conducting voltage Vd of described LED is this single led conducting voltage; When LED is multiple LED strip connection, the conducting voltage Vd of described LED is the conducting voltage sum of the plurality of LED; The like.
Above-mentioned ON time TH and deadline TL be according to following empirical equation calculate draw:
Formula one: I=V*T/L=(Vi-Vd) * TH/L, this formula one is the computing formula of inductance peak current I, voltage V, time T and inductance value L, wherein I is the peak current of inductance L 1, unit is ampere, Vi inputs to the crest voltage of described DC-DC reduction voltage circuit or average peak voltage or average voltage behind commercial power rectification, unit is volt, and Vd is the conducting voltage of described LED, unit is volt, and the unit of ON time TH is second.Formula I=V*T/L is an empirical formula, in the DC-DC reduction voltage circuit of Fig. 1, suppose that the D.C. resistance of inductance L 1 is very little, capacitive reactance is also very little, and the voltage drop change of LED is also minimum, formula is once the good realistic measurement data of energy so in actual applications.
Formula two: TH=I*L/ (Vi-Vd), converts formula one a little, just obtains formula two, namely the computing formula of ON time TH; As long as peak current I, inductance value L, input voltage Vi, the conducting voltage Vd of described LED substitutes into, and just can calculate the ON time TH of switch element 300.
In a LED, peak current I is that hope is constant, a constant at last, and the conducting voltage Vd of inductance value L and LED is constant, is also constant; In fact the conducting voltage of electric current, inductance value and LED all can some small change, and just variable quantity is very little, can be similar to and calculate as constant.So formula two just only has this Two Variables of ON time TH of input voltage Vi and switch element 300, that is with this formula two, just can change the ON time TH of switch element 300 according to the change of input voltage Vi, make the peak current I of LED constant.
During switch element 300 conducting, the electric current of inductance L 1 changes from small to big, and is the process of an energy storage, and when switch element 300 ends, the electric current of inductance L 1 from large to small, is a process released energy.Calculate the average current flowing through LED, the electric current formed when switch element 300 ends must be calculated.
Formula three: TL/TH=(Vi-Vd)/Vd; Formula three is LED constant-current drive circuit work (i.e. BCM patterns in a critical mode, refer to that switch element 300 ends, the electric current of inductance L 1 by peak value to zero time, open the mode of operation of switch element 300 at once), the relation of the conducting voltage Vd of ON time TH, turn-off time TL and input voltage Vi, LED; Formula three can see NXP(grace intelligence Pu semiconductor) the Buck change-over circuit profile of company.
Formula four: TL=(Vi-Vd) * TH/Vd, converts formula three a little, just obtains formula four; Again formula two is substituted into formula four, just obtains:
TL=(Vi-Vd) * I*L/ (Vi-Vd) * Vd, namely
Formula five: TL=I*L/Vd, this formula five be exactly switch element 300 deadline TL computing formula; According to formula five, when when turned off, TL equals I*L/Vd, under constant-current drive circuit as the LED tunable optical of Fig. 1 is operated in critical conduction mode (BCM), TL deadline of switch element 300 is relevant with the conducting voltage Vd of peak current I, inductance value L, LED.In LED, these three parameters can not become substantially.So can reach a conclusion, TL deadline of switch element 300 is constant, only needs change the ON time TH of switch element 300 accordingly according to the change of input voltage Vi, the LED average current of the constant-current drive circuit of this LED tunable optical just can be allowed under different voltage can to keep constant, and the ON operation of Simultaneous Switching element 300 is at the lowest point switching mode.Under critical conduction mode (BCM), the average current flowing through LED approximates the half of peak current.According to formula five, when when turned off, TL is greater than I*L/Vd, the electric current of whole LED is under being operated in discontinuous current mode (DCM).Switch element 300 when critical conduction mode (BCM) and discontinuous current mode (DCM) is all be operated in the lowest point switching mode, is all the normal mode of operation of described LED.Wherein critical conduction mode (BCM) is generally maximum average current, and discontinuous current mode (DCM) is mode of operation when described LED being turned down brightness, and average current is lower.
Fig. 1 is the simple and clear electric principle block diagram of the constant-current drive circuit embodiment one of the utility model LED tunable optical; In this Fig. 1, switch element 300, diode D1 and inductance L 1 form DC-DC reduction voltage circuit, and LED is its load, and the switch element 300 in this Fig. 1 is electron conductive type switching device, such as N channel-type field effect transistor; Electric main rectification is become pulsating direct current by rectifier circuit B1, the input that 1 port (L port) of rectifier circuit B1 and 3 ports (N port) are electric main, 2 ports (positive output end) of rectifier circuit B1 and 4 port (negative output terminals, namely be) that the direct current of rectifier circuit B1 exports two ends, the output voltage of this rectifier circuit B1 is as the input electric power of DC-DC reduction voltage circuit and voltage detection module 100 and sampled targets; Voltage detection module 100 is connected electrically in the output two ends of described rectifier circuit B1; Circuit for regulating and controlling 200 is electrically connected with described voltage detection module 100 and switch element 300, this circuit for regulating and controlling 200 receives the output voltage signal of described voltage detection module 100, by analyzing this output voltage signal, carry out the input voltage Vi at DC-DC reduction voltage circuit two ends described in Real-Time Monitoring, and calculate described switch element 300 ON time TH and deadline TL, control the conducting of described switch element 300 to the ratio of deadline, thus make the constant current hold of driving LED lamp; In this embodiment one, after described input voltage Vi refers to commercial power rectification, input to crest voltage or the average peak voltage of described DC-DC reduction voltage circuit.In this Fig. 1, when the conducting voltage Vd of inductance value L and LED is constant (actual be change very little, constant can be considered as approx in the application), the ON time TH of switch element 300 can be adjusted according to the change of input voltage Vi, thus allow the average current of driving LED lamp constant (actual be change very little, also constant current can be considered as approx in the application), and the ON operation of switch element 300 is at the lowest point switching mode.
Fig. 2 is the simple and clear electric principle block diagram of the constant-current drive circuit embodiment two of described LED tunable optical; This Fig. 2 adds dim signal 400 to input circuit for regulating and controlling 200 on the basis of Fig. 1, make described circuit for regulating and controlling 200 can from outside to adjust described switch element 300 ON time TH or deadline TL, thus make the electric current of driving LED lamp change to reach the object of light modulation.The command voltage signal that dim signal 400 comprises infrared signal, wireless module signal or directly inputs.In this embodiment two, after described input voltage Vi also refers to commercial power rectification, input to crest voltage or the average peak voltage of described DC-DC reduction voltage circuit.
Fig. 3 is the simple and clear electric principle block diagram of the constant-current drive circuit embodiment three of described LED tunable optical; This Fig. 3 is on the basis of Fig. 1, voltage detection module 100 is used as with two divider resistances R1, R2, namely described voltage detection module 100 comprises two resistance R1, R2 being cascaded, and two resistance R1, R2 of this series connection are connected electrically in the output two ends of described rectifier circuit B1; A port of described circuit for regulating and controlling 200 is connected electrically between two resistance R1, R2.Voltage detection module 100 in this Fig. 3 provides the voltage feedback signal of modulating output to circuit for regulating and controlling 200.In this embodiment three, after described input voltage Vi also refers to commercial power rectification, input to crest voltage or the average peak voltage of described DC-DC reduction voltage circuit.
Fig. 4 is the simple and clear electric principle block diagram of the constant-current drive circuit embodiment four of described LED tunable optical; This Fig. 4 is on the basis of Fig. 1, and the position of switch element 300 slightly changes, and the switch element 300 in this Fig. 4 is hole conduction type derailing switch element, as P channel-type field effect transistor.In this embodiment four, after described input voltage Vi also refers to commercial power rectification, input to crest voltage or the average peak voltage of described DC-DC reduction voltage circuit.
Fig. 5 is the simple and clear electric principle block diagram of the constant-current drive circuit embodiment five of described LED tunable optical; This Fig. 5 adds dim signal 400 to input to circuit for regulating and controlling 200 on the basis of Fig. 2.In this embodiment five, after described input voltage Vi also refers to commercial power rectification, input to crest voltage or the average peak voltage of described DC-DC reduction voltage circuit.
Fig. 6 is the simple and clear electric principle block diagram of the constant-current drive circuit embodiment six of described LED tunable optical; This Fig. 6 adds the simple and easy lowering and stabilizing blood pressure supply module into described circuit for regulating and controlling 200 power supply on the basis of Fig. 5, and this supply module comprises dropping resistor RV, voltage stabilizing didoe DV and triode transistor Q1, and this triode transistor Q1 is triode; Dropping resistor RV and voltage stabilizing didoe DV is connected electrically in the output two ends of described rectifier circuit B1 after connecting, the wherein plus earth of voltage stabilizing didoe DV, this ground is exactly the negative output terminal of described rectifier circuit B1, and dropping resistor RV connects the positive output end of described rectifier circuit B1; The base stage of triode transistor Q1 is connected electrically between dropping resistor RV and voltage stabilizing didoe DV, the collector electrode of triode transistor Q1 is connected electrically in the positive output end of described rectifier circuit B1, and the emitter of triode transistor Q1 is electrically connected to the power port of described circuit for regulating and controlling 200.In this Fig. 6, supply module also comprises electric capacity C5, and between the emitter that this electric capacity C5 is connected electrically in triode transistor Q1 and ground, the effect of electric capacity C5 has been energy storage and pressure stabilization function.The each embodiment of the utility model circuit for regulating and controlling used 200 is actually one piece of programmable integrated circuit.Described supply module, except providing burning voltage to except integrated circuit, when integrated circuit enters park mode, can also reduce standby power consumption; Time standby, main that consume electric energy is dropping resistor RV, and play amplification because triode transistor Q1 is just used as current follower, the electric current that dropping resistor RV consumes then can be low to moderate several microampere, so very conservation of power.That the switch element 300 in Fig. 6 adopts is field effect transistor Q2.In this embodiment six, after described input voltage Vi also refers to commercial power rectification, input to crest voltage or the average peak voltage of described DC-DC reduction voltage circuit.
Fig. 7 is the simple and clear electric principle block diagram of the constant-current drive circuit embodiment seven of described LED tunable optical; This Fig. 7 and Fig. 6 is substantially identical, and what the triode transistor Q1 unlike supply module adopted is field effect transistor; The grid of triode transistor Q1 is connected electrically between dropping resistor RV and voltage stabilizing didoe DV, the drain electrode of triode transistor Q1 is connected electrically in the positive output end of described rectifier circuit B1, and the source electrode of triode transistor Q1 is electrically connected to the power port of described circuit for regulating and controlling 200.In this embodiment seven, after described input voltage Vi also refers to commercial power rectification, input to crest voltage or the average peak voltage of described DC-DC reduction voltage circuit.
Fig. 8 is the simple and clear electric principle block diagram of the constant-current drive circuit embodiment eight of described LED tunable optical; This Fig. 8 adds isolating diode D2 and storage capacitor C2 on the basis of Fig. 6; The anode of isolating diode D2 is connected electrically in the positive output end of described rectifier circuit B1, and the cathodic electricity of isolating diode D2 is connected to the anode tap of the LED of DC-DC reduction voltage circuit; Between the negative electrode that storage capacitor C2 is connected electrically in isolating diode D2 and ground.Like this when electric main zero passage, storage capacitor C2 can also provide electric energy to LED.In this embodiment eight, after described input voltage Vi also refers to commercial power rectification, input to crest voltage or the average peak voltage of described DC-DC reduction voltage circuit.
LED in Fig. 1 to Fig. 8 can be single led, also can be multiple LED strip connection, or in parallel again after multiple LED strip connection.
Fig. 9 is a kind of physical circuit schematic diagram of the constant-current drive circuit of described LED tunable optical, in this Fig. 9, switch element 300 is the field effect transistor Q2 of N channel-type, field effect transistor Q2, diode D1 and inductance L 1 form DC-DC reduction voltage circuit, LED is its load, LED is made up of the LED of multiple series connection, certain LED can, only with a LED, also can be also in parallel again after multiple LED strip connection, electric main rectification is become pulsating direct current by rectifier circuit B1, two AC ports of rectifier circuit B1 are the input of electric main, the positive output end of rectifier circuit B1 and negative output terminal () be the output two ends of rectifier circuit B1, the output of this rectifier circuit B1 is as the input of DC-DC reduction voltage circuit and voltage detection module 100, described constant current driver circuit for LED comprises voltage detection module 100 and circuit for regulating and controlling 200, and also comprises inductor J1, dropping resistor RV, voltage stabilizing didoe DV and resistance R5, and inductor J1 is infrared inductor, dropping resistor RV and voltage stabilizing didoe DV forms supply module, for described circuit for regulating and controlling 200 lowering and stabilizing blood pressure is powered, described circuit for regulating and controlling 200 adopts the micro-control unit U1 having eight ports, such as ATMEL(likes special Mel) company produce model be the micro-control unit of atmega88, or the model that the company of Yilong Electric ELECTRONICS CO LTD of TaiWan, China produces is the micro-control unit of EM78P259, etc., described voltage detection module 100 comprises four resistance R1 ~ R4, wherein resistance R1 and R2 is connected electrically in the input two ends of DC-DC reduction voltage circuit after connecting, an isolating diode D2 has been accessed at the positive output end of described rectifier circuit B1, be connected electrically between the negative electrode of isolating diode D2 and the negative output terminal of rectifier circuit B1 after so just making resistance R1 and R2 connect, namely be somebody's turn to do resistance R1 and R2 is connected electrically in the cathode terminal of isolating diode D2, the main input voltage Vi playing detection DC-DC reduction voltage circuit, resistance R3 and R4 is also connected electrically in the output two ends of described rectifier circuit B1 after connecting, two component piezoresistances are adopted to be used as voltage detection module 100 in Fig. 9, wherein resistance R3 and R4 can be used as voltage detection module 100 for subsequent use, this resistance R3 and R4 is connected electrically in the anode tap of isolating diode D2, the input voltage of described micro-control unit U1 is inputed to after mainly working to detect commercial power rectification, safer like this and more accurate, the grid of field effect transistor Q2 is electrically connected to first port OUT of micro-control unit U1 by resistance R5, the drain electrode of field effect transistor Q2 is electrically connected to the anode of inductance L 1 and diode D1, the source ground of field effect transistor Q2, this ground is exactly the negative output terminal of described rectifier circuit B1, dropping resistor RV and voltage stabilizing didoe DV is connected electrically in the output two ends of described rectifier circuit B1 after connecting, the wherein plus earth of voltage stabilizing didoe DV, and dropping resistor RV connects the positive output end of described rectifier circuit B1, 5th the port VDD of micro-control unit U1 connects the common port of dropping resistor RV and voltage stabilizing didoe DV, inductor J1 is infrared inductor, first port IR of this infrared inductor J1 is electrically connected to the 3rd the port IR of micro-control unit U1, second the port ground connection of infrared inductor J1, the 3rd port of infrared inductor J1 connects the common port of dropping resistor RV and voltage stabilizing didoe DV, 4th the port VSS ground connection of micro-control unit U1, the common port V2 of the 6th port V2 connecting resistance R1 and R2 of micro-control unit U1, the common port V1 of the 7th port V1 connecting resistance R3 and R4 of micro-control unit U1, second port of micro-control unit U1 and the 8th port unsettled.
In fig .9, the constant-current drive circuit of described LED tunable optical also comprises filter capacitor C1, storage capacitor C2, electric capacity C3, electric capacity C4 and isolating diode D2.The anode of isolating diode D2 is connected electrically in the positive output end of described rectifier circuit B1, the cathodic electricity of isolating diode D2 is connected to the negative electrode of the diode D1 of DC-DC reduction voltage circuit, also be the anode of first LED in LED, between the negative electrode that storage capacitor C2 is connected electrically in isolating diode D2 and ground.Like this when electric main zero passage, storage capacitor C2 can also provide electric energy to LED, and storage capacitor C2 can allow the voltage fluctuation after rectification less.Filter capacitor C1 is connected in parallel on LED two ends, and this filter capacitor C1 effect is filtering, and this filter capacitor C1 can allow the current ripples of LED less, and the capacitance of filter capacitor C1 is large, can make the electric current flowing through LED also can be very level and smooth.Electric capacity C3 is connected in parallel on the two ends of resistance R2, and the effect of electric capacity C3 makes the crest voltage at DC-DC reduction voltage circuit two ends more steady, and such detected value is more stable.Electric capacity C4 is connected in parallel on the two ends of voltage stabilizing didoe DV, and the effect of electric capacity C4 has been the effect of energy storage and voltage stabilizing, when alternating current zero passage, provides electric energy to micro-control unit U1 use, allows the voltage of micro-control unit U1 more steady when voltage is crest voltage.
In the physical circuit of Fig. 9, when the Capacity Ratio of described DC-DC reduction voltage circuit two ends storage capacitor C2 of parallel connection together with voltage detection module 100 two ends is less, namely the capability value of storage capacitor C2 is little must in a voltage wave cycle, when the fluctuation of input voltage Vi is more than or equal to 5%, after described input voltage Vi refers to commercial power rectification, input to crest voltage or the average peak voltage at described DC-DC reduction voltage circuit two ends, when the capacity of described DC-DC reduction voltage circuit two ends storage capacitor C2 of parallel connection together with voltage detection module 100 two ends is enough large, namely the capability value of storage capacitor C2 is large must in a voltage wave cycle, when the fluctuation of input voltage Vi is less than 5%, the average voltage at described DC-DC reduction voltage circuit two ends is inputed to after described input voltage Vi generally can adopt commercial power rectification, crest voltage or the average peak voltage at described DC-DC reduction voltage circuit two ends is inputed to after certain described input voltage Vi also can adopt commercial power rectification, now adopt crest voltage or average peak voltage and adopt average voltage similar.
The constant-current drive circuit of the LED tunable optical of Fig. 9 can receive infrared signal and carry out remote control light modulating, and the dim signal modular circuit in remote controller does not draw in the utility model; Voltage after the rectifier circuit B1 rectification of Fig. 9 is divided into two-way, one tunnel is directly powered to micro-control unit U1 and inductor J1 by dropping resistor RV and voltage stabilizing didoe DV, and isolating diode D2 of leading up to supplies resistance R1 and R2 of DC-DC reduction voltage circuit and voltage detection module 100; Micro-control unit U1 controls the brightness of LED by receiving infrared signal.
Adopt the constant-current drive circuit of the utility model LED tunable optical, inductance L 1 in DC-DC reduction voltage circuit can adopt the inductance that inductance value is less, such as adopt the inductance of milihenry rank, so just can make the small volume of inductance L 1, such as, inductance L 1 in Fig. 9 physical circuit can adopt 1.5 milihenries.
The utility model proposes another mentality of designing, the feedback resistance that need not connect is to reach constant current, and gather the crest voltage after rectification or average peak voltage by voltage detection module 100, even or average voltage, again by the output voltage signal of circuit for regulating and controlling 200 analytical voltage detection module 100, carry out the input voltage Vi at Real-Time Monitoring DC-DC reduction voltage circuit two ends, and calculate described switch element 300 ON time TH and deadline TL, control the conducting of described switch element 300 to the ratio of deadline, thus make the constant current hold of the described LED of driving, and allow switch element 300 remain operating in the lowest point switching mode.The micro-control unit of prior art is all integrated with A/D converter and PWM controller, single like this micro-control unit just can realize gathering voltage signal, the conducting of control switch element 300 and deadline, reach control LED current constant, and receive external signal, adjust LED current and realize intelligent dimming.
Although the voltage behind commercial power rectification ceaselessly changes (although the frequency and voltage of country variant civil power is different with the cycle of 100 hertz from zero to three hectovolts, also current constant control can be realized) according to method of the present utility model, but its effective average voltage change is little, and each crest voltage continues about 50 microseconds.The speed of the A/D converter of 1 megahertz micro-control unit can faster than 20 microseconds, this each crest voltage of just sampling.As long as be averaged crest voltage to represent average effective voltage, carried out the switch of control switch element 300 by micro-control unit, the average current flowing through LED so on the whole just can keep constant current.Just can realize constant current with the reaction speed of tens microseconds microsecond even up to a hundred to drive, the integrated circuit of such lower cost and lower power consumption just can realize keeping the constant of electric current when voltage fluctuation, thus realizes intelligent dimming.
The above embodiment only have expressed preferred implementation of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims; It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model; Therefore, all equivalents of doing with the utility model right and modification, all should belong to the covering scope of the utility model claim.
Claims (7)
1. a constant-current drive circuit for LED tunable optical, comprises the DC-DC reduction voltage circuit be made up of switch element (300), diode D1, inductance L 1 and LED, and commercial power rectification is become the rectifier circuit B1 of pulsating direct current; It is characterized in that:
Also comprise voltage detection module (100) and circuit for regulating and controlling (200); Described voltage detection module (100) is connected electrically in the output two ends of described rectifier circuit B1; Described circuit for regulating and controlling (200) is electrically connected mutually with described voltage detection module (100) and switch element (300), this circuit for regulating and controlling (200) receives the output voltage signal of described voltage detection module (100), by analyzing this output voltage signal, carry out the input voltage Vi at DC-DC reduction voltage circuit two ends described in Real-Time Monitoring, and calculate described switch element (300) ON time TH and deadline TL, control the conducting of described switch element (300) to the ratio of deadline, thus make the constant current hold of driving LED lamp.
2. the constant-current drive circuit of LED tunable optical according to claim 1, is characterized in that:
Also comprise and can receive the inductor J1 that external dimmer signaling module sends dim signal, the dim signal of reception is passed to described circuit for regulating and controlling (200) by this inductor J1, after described circuit for regulating and controlling (200) receives this dim signal, adjust described switch element (300) ON time TH or deadline TL, thus make the electric current of driving LED lamp change to reach the object of light modulation.
3. the constant-current drive circuit of LED tunable optical according to claim 1, is characterized in that:
Described voltage detection module (100) comprises two resistance R1, R2 being cascaded, and two resistance R1, R2 of this series connection are connected electrically in the output two ends of described rectifier circuit B1; A port of described circuit for regulating and controlling (200) is connected electrically between two resistance R1, R2.
4. the constant-current drive circuit of LED tunable optical according to claim 1, is characterized in that:
Also comprise isolating diode D2 and storage capacitor C2; The anode of isolating diode D2 is connected electrically in the positive output end of described rectifier circuit B1, and the cathodic electricity of isolating diode D2 is connected to the anode tap of the LED of described DC-DC reduction voltage circuit; Between the negative electrode that storage capacitor C2 is connected electrically in isolating diode D2 and ground.
5. the constant-current drive circuit of LED tunable optical according to claim 1, is characterized in that:
Described circuit for regulating and controlling (200) is programmable integrated circuit, comprises programmable micro-control unit or chip microprocessor and peripheral circuit thereof.
6. the constant-current drive circuit of the LED tunable optical according to any one of claim 1 to 5, is characterized in that:
Also comprise the supply module of powering for described circuit for regulating and controlling (200) lowering and stabilizing blood pressure, this supply module comprises dropping resistor RV, voltage stabilizing didoe DV and triode transistor Q1, and this triode transistor Q1 is field effect transistor or triode; Dropping resistor RV and voltage stabilizing didoe DV is connected electrically in the output two ends of described rectifier circuit B1 after connecting, the wherein plus earth of voltage stabilizing didoe DV, this ground is exactly the negative output terminal of described rectifier circuit B1, and dropping resistor RV connects the positive output end of described rectifier circuit B1; The grid of triode transistor Q1 or base stage are connected electrically between dropping resistor RV and voltage stabilizing didoe DV, the drain electrode of triode transistor Q1 or collector electrode are connected electrically in the positive output end of described rectifier circuit B1, and the source electrode of triode transistor Q1 or emitter are electrically connected to the power port of described circuit for regulating and controlling (200).
7. the constant-current drive circuit of the LED tunable optical according to any one of claim 1,4 or 5, is characterized in that:
Also comprise inductor J1, dropping resistor RV, voltage stabilizing didoe DV and resistance R5; Described circuit for regulating and controlling (200) is for there being the micro-control unit U1 of eight ports; Described voltage detection module (100) comprises two resistance R1 and R2, and resistance R1 and R2 is connected electrically in the output two ends of described rectifier circuit B1 after connecting; Described switch element (300) is field effect transistor Q2, the grid of field effect transistor Q2 is electrically connected to first port OUT of micro-control unit U1 by resistance R5, the drain electrode of field effect transistor Q2 is electrically connected to the anode of inductance L 1 and diode D1, the source ground of field effect transistor Q2, this ground is exactly the negative output terminal of described rectifier circuit B1; Dropping resistor RV and voltage stabilizing didoe DV is connected electrically in the output two ends of described rectifier circuit B1 after connecting, the wherein plus earth of voltage stabilizing didoe DV, and dropping resistor RV connects the positive output end of described rectifier circuit B1; 5th the port VDD of micro-control unit U1 connects the common port of dropping resistor RV and voltage stabilizing didoe DV; Inductor J1 is infrared inductor, first port IR of this infrared inductor J1 is electrically connected to the 3rd the port IR of micro-control unit U1, second the port ground connection of infrared inductor J1, the 3rd port of infrared inductor J1 connects the common port of dropping resistor RV and voltage stabilizing didoe DV; 4th the port VSS ground connection of micro-control unit U1, the common port V2 of the 6th port V2 connecting resistance R1 and R2 of micro-control unit U1, second port of micro-control unit U1 and the 8th port unsettled.
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| CN201520581678.3U CN204836696U (en) | 2015-08-05 | 2015-08-05 | Constant -current drive circuit that LED lamp can be adjusted luminance |
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| CN201520581678.3U CN204836696U (en) | 2015-08-05 | 2015-08-05 | Constant -current drive circuit that LED lamp can be adjusted luminance |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105898958A (en) * | 2015-08-05 | 2016-08-24 | 肖志军 | Constant current driving method and circuit for LED lamp light adjustment |
| CN106535414A (en) * | 2016-12-22 | 2017-03-22 | 惠州Tcl照明电器有限公司 | Sensing control circuit and LED (Light Emitting Diode) power drive control circuit |
| CN107635323A (en) * | 2016-01-13 | 2018-01-26 | 上海新进芯微电子有限公司 | Led drive circuit |
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| CN107770893A (en) * | 2016-08-15 | 2018-03-06 | 肖志军 | The PWM method of supplying power to of soft and smooth control LED brightness |
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2015
- 2015-08-05 CN CN201520581678.3U patent/CN204836696U/en not_active Withdrawn - After Issue
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| CN105898958A (en) * | 2015-08-05 | 2016-08-24 | 肖志军 | Constant current driving method and circuit for LED lamp light adjustment |
| WO2017020670A1 (en) * | 2015-08-05 | 2017-02-09 | 肖志军 | Constant current driving method and circuit enabling dimming of led lamp |
| CN107635323A (en) * | 2016-01-13 | 2018-01-26 | 上海新进芯微电子有限公司 | Led drive circuit |
| CN107635323B (en) * | 2016-01-13 | 2019-10-08 | 上海新进芯微电子有限公司 | LED drive circuit |
| CN112664846A (en) * | 2016-01-22 | 2021-04-16 | 嘉兴山蒲照明电器有限公司 | Installation detection device, power module device and LED lamp using same |
| CN112664846B (en) * | 2016-01-22 | 2023-03-28 | 嘉兴山蒲照明电器有限公司 | Installation detection device, power module device and LED lamp using same |
| CN107770893A (en) * | 2016-08-15 | 2018-03-06 | 肖志军 | The PWM method of supplying power to of soft and smooth control LED brightness |
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| CN107635322A (en) * | 2017-10-27 | 2018-01-26 | 国网山东省电力公司商河县供电公司 | A kind of Dimmable LED constant-current drive circuit |
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