CN203984748U - LED light fixture Drive and Control Circuit and LED light fixture - Google Patents
LED light fixture Drive and Control Circuit and LED light fixture Download PDFInfo
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- CN203984748U CN203984748U CN201420423286.XU CN201420423286U CN203984748U CN 203984748 U CN203984748 U CN 203984748U CN 201420423286 U CN201420423286 U CN 201420423286U CN 203984748 U CN203984748 U CN 203984748U
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Abstract
The utility model relates to LED light fixture Drive and Control Circuit and LED light fixture, wherein, LED light fixture Drive and Control Circuit comprises PWM controller, MUX, variable voltage source, the first driver, the second driver, the first constant current auxiliary circuit and the second constant current auxiliary circuit.The utility model LED light fixture Drive and Control Circuit provides a kind of control circuit hardware structure that two groups of different LED chip groups of colour temperature are carried out the toning light modulation of not intermodulation that is utilized to control.
Description
Technical field
The utility model relates to LED lighting field, is specifically related to LED light fixture Drive and Control Circuit and LED light fixture.
Background technology
LED light source has the advantages such as environmental protection, energy-conservation, long service life, driving voltage be low, is acknowledged as the most promising lighting source of 21 century.
In middle high-power LED lighting fixture, people wish that LED light fixture preferably possesses toning function, to obtain the illuminating effect that approaches natural daylight most; User also wishes that LED light fixture possesses dimming function, so that can arbitrarily regulate according to different lighting environments the brightness of light fixture simultaneously.
Although in recent years, there are many tunable optical toning LED light fixtures in market, due to the problem of control circuit, regulating effect and users' expectation differ larger, when main manifestations is toning, lamp brightness can change with light fixture colour temperature, and this adjusting problem is called brightness and colour temperature intermodulation problem.
The meaning of english abbreviation representative used herein under this explanation.LED, English full name is Light Emitting Diode, Chinese is: light-emitting diode.PWM, English full name is Pulse Width Modulation, Chinese is: pulse width modulation.Metal-oxide-semiconductor, claims again MOSFET, and English full name is Metal Oxide Semiconductor Field Effect Transistor, and Chinese is mos field effect transistor, also claims isolated-gate field effect transistor (IGFET); Power MOS pipe, also claims POWER MOSFET, is the special isolated-gate field effect transistor (IGFET) of a class conducting channel groove structure, is divided into: P ditch enhanced power metal-oxide-semiconductor, P ditch depletion type power MOS pipe, N ditch enhanced power metal-oxide-semiconductor and N ditch depletion type power MOS pipe.In this article, power NMOS pipe refers to N ditch enhanced power metal-oxide-semiconductor.
Utility model content
Based on this, being necessary, for brightness and colour temperature intermodulation problem, provides a kind of LED light fixture Drive and Control Circuit, and it is a kind of control circuit hardware structure that two groups of different LED chip groups of colour temperature are carried out the toning light modulation of not intermodulation that is utilized to control.
Based on this, being necessary, for brightness and colour temperature intermodulation problem, provides a kind of LED light fixture, and it is a kind of LED light fixture hardware structure that is utilized to carry out the toning light modulation of not intermodulation.
LED light fixture Drive and Control Circuit, comprises PWM controller, MUX, variable voltage source, the first driver, the second driver, the first constant current auxiliary circuit and the second constant current auxiliary circuit; Described PWM controller is provided with the first output and the second output, described MUX is provided with the first selection input, second and selects input, two data input pins and an output, described variable voltage source is provided with controlled end and output, and described the first constant current auxiliary circuit, described the second constant current auxiliary circuit are respectively equipped with drive end and input; The first output of PWM controller connects the input of the first driver, the first selection input of MUX, and the second output of PWM controller connects the input of the second driver, the second selection input of MUX; The output of the first driver connects the drive end of the first constant current auxiliary circuit, and the output of the second driver connects the drive end of the second constant current auxiliary circuit; Two data input pins of MUX connect respectively the input of the first constant current auxiliary circuit, the input of the second constant current auxiliary circuit, and the output of MUX connects the controlled end of variable voltage source; The input of the input of the output of variable voltage source and the first constant current auxiliary circuit, the second constant current auxiliary circuit forms respectively the first external interface, the second external interface, and variable voltage source jointly completes constant current with the first constant current auxiliary circuit, the second constant current auxiliary circuit respectively and controls.
Therein in an embodiment, described the first constant current auxiliary circuit comprises the first power NMOS pipe, the first error amplifier, the first reference power supply and the first sampling resistor, the source electrode of the first power NMOS pipe connects one end of inverting input and first sampling resistor of the first error amplifier, the other end ground connection of the first sampling resistor, the first reference power supply connects the normal phase input end of the first error amplifier, the output of the first error amplifier connects the grid of the first power NMOS pipe, the drain electrode of the first power NMOS pipe is as the input of described the first constant current auxiliary circuit, the grid of the first power NMOS pipe is as the controlled end of described the first constant current auxiliary circuit, described the second constant current auxiliary circuit comprises the second power NMOS pipe, the second error amplifier, the second reference power supply and the second sampling resistor, the source electrode of the second power NMOS pipe connects one end of inverting input and second sampling resistor of the second error amplifier, the other end ground connection of the second sampling resistor, the second reference power supply connects the normal phase input end of the second error amplifier, the output of the second error amplifier connects the grid of the second power NMOS pipe, the drain electrode of the second power NMOS pipe is as the input of described the second constant current auxiliary circuit, the grid of the second power NMOS pipe is as the controlled end of described the second constant current auxiliary circuit.
Therein in an embodiment, described LED light fixture Drive and Control Circuit also comprises OD output NAND gate, OD output NAND gate is provided with two data input pins and an output, connect one to one respectively two data input pins of OD output NAND gate of the first output of PWM controller, the second output, the output of OD output NAND gate connects the drive end of the first constant current auxiliary circuit or the drive end of the second constant current auxiliary circuit.
In an embodiment, between the output of described MUX and the controlled end of described variable voltage source, be serially connected with in order analog to digital converter, decision circuit, digital to analog converter therein.
In an embodiment, the first external interface of described LED light fixture Drive and Control Circuit, the second external interface are all connected with respectively diode therein.
In an embodiment, the first external interface of described LED light fixture Drive and Control Circuit, the second external interface are all connected with respectively decoupling capacitor therein.
A kind of LED light fixture, the LED lamp group that comprises LED light fixture Drive and Control Circuit described in the utility model and two groups of different-colours, the LED lamp group of two groups of different-colours is corresponding the first external interface and the second external interface that is connected to described LED light fixture Drive and Control Circuit respectively.
LED light fixture Drive and Control Circuit of the present utility model utilize variable voltage source can respectively with the first constant current auxiliary circuit, the second constant current auxiliary circuit completes on the basis that constant current controls jointly, in conjunction with PWM controller, control variable voltage source respectively with the first constant current auxiliary circuit, the cooperative sequential of the second constant current auxiliary circuit, a kind of control circuit hardware structure that two groups of different LED chip groups of colour temperature are carried out the toning light modulation of not intermodulation that is utilized to control is provided.And PWM controller, the first driver, the second driver all do not participate in the work of constant current control, relatively improved the stability that constant current is controlled; Utilize MUX to select the first in running order constant current auxiliary circuit or the second constant current auxiliary circuit and variable voltage source co-operation according to the output signal of PWM controller, avoided arranging two variable voltage sources and the first constant current auxiliary circuit, the second constant current auxiliary circuit carries out corresponding matching one by one, the number that arranges that has reduced variable voltage source, has reduced cost relatively.
The utility model is jointly realized constant current and is controlled by the first constant current auxiliary circuit of above-mentioned concrete structure or the second constant current auxiliary circuit and variable voltage source are set, relatively current constant-current circuit, do not need DC-DC translation circuit, volume reduces relatively, also there is no the electromagnetic interference of extra circuits.
The utility model LED light fixture Drive and Control Circuit is by arranging OD output NAND gate between two outputs at PWM controller and the drive end of the first constant current auxiliary circuit or the drive end of the second constant current auxiliary circuit, both work simultaneously to have avoided PWM controller to cause the first constant current auxiliary circuit, the second constant current auxiliary circuit in powered on moment or graunch, cause variable voltage source overload.
The utility model LED light fixture Drive and Control Circuit is all connected with respectively diode at the first external interface, the second external interface.The purpose of this design is, when the first external interface, the second external interface connect respectively LED chip group and carry out work, diode can absorb the spike that LED chip group line stray inductance causes.
The utility model LED light fixture Drive and Control Circuit is all connected with respectively decoupling capacitor at the first external interface, the second external interface.The purpose of this design is, the LED chip group connecting into for avoiding High-frequency Interference stream of pulses to cross.
The utility model LED light fixture is in conjunction with the LED lamp group of LED light fixture Drive and Control Circuit described in the utility model and two groups of different-colours, and a kind of hardware structure of LED light fixture of the light modulation that can be used for mixing colours is provided.
The utility model also provides a kind of LED light fixture Drive and Control Circuit, comprises PWM controller, variable voltage source, driver and constant current auxiliary circuit; Described PWM controller is established output, and described variable voltage source is provided with controlled end and output, and described constant current auxiliary circuit is provided with drive end and input; The output of PWM controller connects the input of driver; The output of driver connects the drive end of constant current auxiliary circuit; Constant current auxiliary circuit is provided with the controlled end that input connects variable voltage source; The input of the output of variable voltage source and constant current auxiliary circuit forms external interface, and variable voltage source and constant current auxiliary circuit jointly complete constant current and control.
Therein in an embodiment, described constant current auxiliary circuit comprises power NMOS pipe, error amplifier, reference power supply and sampling resistor, the source electrode of power NMOS pipe connects the inverting input of error amplifier and one end of sampling resistor, the other end ground connection of sampling resistor, reference power supply connects the normal phase input end of error amplifier, the output of error amplifier connects the grid of power NMOS pipe, the drain electrode of power NMOS pipe is as the input of described constant current auxiliary circuit, and the grid of power NMOS pipe is as the controlled end of described constant current auxiliary circuit.
In an embodiment, between the input of described constant current auxiliary circuit and the controlled end of described variable voltage source, be serially connected with in order analog to digital converter, decision circuit, digital to analog converter therein.
The utility model is utilizing variable voltage source jointly to complete on the basis of constant current control with constant current auxiliary circuit, in conjunction with PWM controller, control the work schedule of variable voltage source and constant current auxiliary circuit, a kind of control circuit hardware structure that one group of monochromatic warm LED chip group is carried out light modulation that can be used for controlling is provided.And PWM controller, driver all do not participate in the work of constant current control, relatively improved the stability that constant current is controlled.
The utility model is jointly realized constant current and is controlled by the constant current auxiliary circuit of above-mentioned concrete structure and variable voltage source are set, and constant-current circuit, does not need DC-DC translation circuit relatively at present, and volume reduces relatively, also there is no the electromagnetic interference of extra circuits.
Accompanying drawing explanation
Fig. 1 is the hardware configuration schematic diagram of embodiment mono-LED light fixture Drive and Control Circuit;
Fig. 2 is the hardware configuration schematic diagram of embodiment bis-LED light fixtures;
Fig. 3 is the hardware configuration schematic diagram of embodiment tri-LED light fixture Drive and Control Circuit;
Fig. 4 is the hardware configuration schematic diagram of embodiment tetra-LED light fixtures.
Embodiment
Embodiment mono-
As shown in Figure 1, LED light fixture Drive and Control Circuit comprises PWM controller 1, MUX 2, variable voltage source 3, the first driver 4, the second driver 5, the first constant current auxiliary circuit 6 and the second constant current auxiliary circuit 7; PWM controller 1 is provided with the first output and the second output, MUX 2 is provided with the first selection input, second and selects input, two data input pins and an output, variable voltage source 3 is provided with controlled end and output, and the first constant current auxiliary circuit 6, the second constant current auxiliary circuit 7 are all provided with respectively drive end and input; The first output of PWM controller 1 connects the input of the first driver 4, the first selection input of MUX 2, and the second output of PWM controller 1 connects the input of the second driver 5, the second selection input of MUX 2; The output of the first driver 4 connects the drive end of the first constant current auxiliary circuit 6, and the output of the second driver 5 connects the drive end of the second constant current auxiliary circuit 7; Two data input pins of MUX 2 connect respectively the input of the first constant current auxiliary circuit 6, the input of the second constant current auxiliary circuit 7, and the output of MUX 2 connects the controlled end of variable voltage source; The input of the input of the output of variable voltage source 3 and the first constant current auxiliary circuit 6, the second constant current auxiliary circuit 7 forms respectively the first external interface 21, the second external interface 22, and variable voltage source 3 jointly completes constant current with the first constant current auxiliary circuit 6, the second constant current auxiliary circuit 7 respectively and controls.
The operation principle of this LED light fixture Drive and Control Circuit is: PWM controller 1 sends the pulse signal that adjustable two-way pulse position staggers mutually, utilize the first driver 4, the second driver 5 is controlled the first constant current auxiliary circuits 6 and the second constant current auxiliary circuit 7 (the first driver 4 that takes turns to operate, the second driver 5 has improved the load capacity of driving pulse, to drive respectively the first constant current auxiliary circuit 6, the second constant current auxiliary circuit 7), MUX 2 is sent two pulse signals according to PWM controller 1 and can be selected and be in the controlled end that the first constant current auxiliary circuit 6 of operating state or the input end signal of the second constant current auxiliary circuit 7 are given to variable voltage source 3, variable voltage source 3 is for being controlled by external signal, export variable Switching Power Supply, variable voltage source 3 in turn with the first constant current auxiliary circuits 6, the second constant current auxiliary circuit 7 jointly completes constant current and controls.
The application of this LED light fixture Drive and Control Circuit is, the first external interface 21, the second external interface 22 in LED light fixture Drive and Control Circuit access respectively two groups of LED chip groups that colour temperature is different, then by adjusting the duty ratio of two pulse signals of PWM controller 1 output, thereby control the work schedule of the LED chip group that two groups of colour temperatures are different, realization reaches mutually non-interfering light modulation toning effect, can obtain corresponding colour temperature and brightness, and realize in brightness regulation process, it is constant that colour temperature maintains, in colour temperature adjustment process, it is constant that brightness maintains.
Therefore, the utility model utilize variable voltage source 3 can respectively with the first constant current auxiliary circuit 6, the second constant current auxiliary circuit 7 completes on the basis that constant current controls jointly, in conjunction with PWM controller 1, control variable voltage source 3 respectively with the first constant current auxiliary circuits 6, the second constant current auxiliary circuit road 7 cooperative sequential, a kind of mix colours control circuit hardware structure of light modulation of two groups of different LED chip groups of colour temperature that is utilized to control is provided.And PWM controller 1, the first driver 4, the second driver 5 all do not participate in the work of constant current control, relatively improved the stability that constant current is controlled; Utilize MUX 2 to select in the first constant current auxiliary circuit 6 or the second constant current auxiliary circuit 7 and variable voltage source 3 co-operation according to the output signal of PWM controller 1, two variable voltage sources have been avoided arranging and the first constant current auxiliary circuit 6, the second constant current auxiliary circuit 7 carry out corresponding matching one by one, the number that arranges that has reduced variable voltage source, has reduced cost relatively.
Therein in an embodiment, the first constant current auxiliary circuit 6 comprises the first power NMOS pipe Q1, the first error amplifier EA1, the first reference power supply Vref1 and the first sampling resistor Rs1, the source S of the first power NMOS pipe Q1 connects one end of inverting input and the first sampling resistor Rs1 of the first error amplifier EA1, the other end ground connection of the first sampling resistor Rs1, the first reference power supply Vref1 connects the normal phase input end of the first error amplifier EA1, the output of the first error amplifier EA1 connects the grid G of the first power NMOS pipe Q1, the drain D of the first power NMOS pipe Q1 is as the input of the first constant current auxiliary circuit 6, the grid G of the first power NMOS pipe Q1 is as the controlled end of the first constant current auxiliary circuit 6, the second constant current auxiliary circuit 7 comprises the second power NMOS pipe Q2, the second error amplifier EA2, the second reference power supply Vref2 and the second sampling resistor Rs2, the source S of the second power NMOS pipe Q2 connects one end of inverting input and the second sampling resistor Rs2 of the second error amplifier EA2, the other end ground connection of the second sampling resistor Rs2, the second reference power supply Vref2 connects the normal phase input end of the second error amplifier EA2, the output of the second error amplifier EA2 connects the grid G of the second power NMOS pipe Q2, the drain D of the second power NMOS pipe Q2 is as the input of the second constant current auxiliary circuit 7, the grid G of the second power NMOS pipe Q2 is as the controlled end of the second constant current auxiliary circuit 7.
The first constant current auxiliary circuit 6 of this concrete structure or the second constant current auxiliary circuit 7 are jointly realized constant current with variable voltage source 3 and are controlled, relatively current constant-current circuit, do not need DC-DC translation circuit, volume reduces relatively, also there is no the electromagnetic interference of extra circuits.
At this, with the first external interface 21, second external interface 22 of this LED light fixture Drive and Control Circuit, access respectively two groups of different LED chip groups of colour temperature and carry out concrete job description, to increase the understanding to this LED light fixture Drive and Control Circuit.Between the first output output high period of PWM controller 1, now, the second output output low level of PWM controller 1, MUX 2 selects the voltage signal of the drain D of the first power NMOS pipe Q1 to be given to the controlled end of variable voltage source 3, the first driver 4 drives the first power NMOS pipe Q1 conducting, the second not conducting of power NMOS pipe Q2; The co-operation of variable voltage source 3 and the first constant current auxiliary circuit 6 is as follows: when the output voltage V cc of variable voltage source 3 is on the low side, by being connected on the drive current I of the LED chip group of the first external interface 21
oWbe less than rated value (Vref1/Rs1), the first error amplifier EA1 output voltage is high, the drain D of the first power NMOS pipe Q1 and the pressure drop V between source S
dSvery little, the input voltage value of the controlled end of variable voltage source 3 is on the low side, and variable voltage source 3 will boosted output voltages Vcc, makes above-mentioned drive current I
oWraise; When the output voltage V cc of variable voltage source 3 is higher, the anti-phase input terminal voltage of the first error amplifier EA1 raises, and the first error amplifier EA1 output voltage reduces, the drain D of the first power NMOS pipe Q1 and the pressure drop V between source S
dSraise, the both end voltage that is connected on the LED chip group of the first external interface 21 reduces, above-mentioned drive current I
oWdecline, finally make above-mentioned drive current I
oWstable; At drive current I
oWreach in rated value situation, if the drain D of the first power NMOS pipe Q1 and the pressure drop V between source S
dSbe greater than settings, the input voltage value of the controlled end of variable voltage source 3 is higher, and the output voltage V cc of variable voltage source 3 will decline, and finally makes the output voltage V cc of variable voltage source 3 stable in the reasonable scope.Between the second output output high period of PWM controller 1, now, the first output output low level of PWM controller 1, MUX 2 selects the voltage signal of the drain D of the second power NMOS pipe Q2 to be given to the controlled end of variable voltage source 3, the second driver 5 drives the second power NMOS pipe Q2 conducting, the first not conducting of power NMOS pipe Q1; The co-operation of variable voltage source 3 and the second constant current auxiliary circuit 7 is with reference to the co-operation of variable voltage source 3 and the first constant current auxiliary circuit 6.By adjusting the duty ratio of two pulse signals of PWM controller 1 output, can obtain corresponding colour temperature and brightness, and realize in brightness regulation process, it is constant that colour temperature maintains, and in colour temperature adjustment process, it is constant that brightness maintains.
State in the use in the LED light fixture Drive and Control Circuit of the first constant current auxiliary circuit 6, the second constant current auxiliary circuit 7, the first driver 4, the second driver 5 are the corresponding work that drives the first power NMOS pipe Q1, the second power NMOS pipe Q2, therefore, the first driver 4, the second driver 5 can adopt respectively gate drivers, also can according to its effect, carry out other specific designs by those of ordinary skills.
Therein in an embodiment, this LED light fixture Drive and Control Circuit also comprises OD output NAND gate 8, OD output NAND gate 8 is provided with two data input pins and an output, connect one to one respectively two data input pins of OD output NAND gate 8 of the first output of PWM controller 1, the second output, the output of OD output NAND gate 8 connects the drive end of the first constant current auxiliary circuit 6 or the second constant current auxiliary circuit 7.This scheme is mainly that both work simultaneously in order to avoid PWM controller 1 to cause the first constant current auxiliary circuit 6, the second constant current auxiliary circuit 7 in powered on moment or graunch, causes variable voltage source overload.
Therein in an embodiment, between the controlled end of the output of MUX 2 and variable voltage source 3, be serially connected with in order analog to digital converter 51, decision circuit 52, digital to analog converter 53, the operation principle of this partial circuit is, the output voltage values of MUX 2, through analog to digital converter 51, convert digital signal to and be given to decision circuit 52, on the low side when lower than a preset value through decision circuit 52 judgement, export one and represent that low level data are to digital to analog converter 53, digital to analog converter 53 output LOW voltage signals, therefore, the input voltage value of the controlled end of variable voltage source 3 is on the low side, force the voltage vcc of variable voltage source 3 outputs to raise, if higher when higher than another preset value through decision circuit 52 judgement, export data that represent high level to digital to analog converter 53, digital to analog converter 53 output HIGH voltage signals, therefore, the input voltage value of the controlled end of variable voltage source 3 is higher, forces the voltage vcc of variable voltage source 3 outputs to decline.This programme is by arranging by analog to digital converter 51, decision circuit 52, digital to analog converter 53, providing a kind of can, for adjusting the circuit hardware framework of input signal of the controlled end of variable voltage source 3, make the different multiple variable voltage source 3 of controlled end semaphore request go in the application's LED light fixture Drive and Control Circuit.
In an embodiment, the first external interface 21 of this LED light fixture Drive and Control Circuit, the second external interface 22 have been connected respectively diode D1, diode D2 therein.The purpose of this design is, when the first external interface 21, the second external interface 22 connect respectively LED chip group and carry out work, diode D1, diode D2 can absorb the spike that LED chip group line stray inductance causes.
In an embodiment, the first external interface 21 of this LED light fixture Drive and Control Circuit, the second external interface 22 have been connected respectively decoupling capacitor C1, C2, the LED chip group connecting into for avoiding High-frequency Interference stream of pulses to cross therein.
Embodiment bis-
As depicted in figs. 1 and 2, the present embodiment provides a kind of LED light fixture, it comprises that the LED lamp group of 71,72, two groups of different-colours of LED lamp group of LED light fixture Drive and Control Circuit described in embodiment mono-and two groups of different-colours is connected to the first external interface 21 and second external interface 22 of LED light fixture Drive and Control Circuit.
One description can be known in conjunction with the embodiments, by adjusting the duty ratio of two pulse signals of PWM controller 1 output, and can be so that LED light fixture reaches light modulation toning effect.Therefore, the present embodiment provides a kind of hardware structure of LED light fixture of the light modulation that can be used for mixing colours.
At this, the design parameter setting of describing a practical application increases the understanding to scheme.
Suppose that LED light fixture power output is 36W, two groups of LED chip group inner connecting ways are 24 strings 3 also, and two paths of LED chip count is 72 * 2, and both driving voltages are 72～82V, and both drive currents are 450mA.For reducing the loss of power NMOS pipe, the first constant current auxiliary circuit 6 and the second constant current auxiliary circuit 7 adopt respectively 60V/3A power NMOS pipe, reference power supply Vref1, Vref2 are 0.45V, sampling resistor Rs1, Rs2 all get 1.0 Ω, for avoiding stroboscopic, the frequency of two pulse signals of PWM controller is fixed as 10.0KHz, by changing the duty ratio D of two pulse signals of PWM controller, and can be from visually obtaining the light modulation toning illuminating effect of colour temperature conversion, luminance transformation.
Embodiment tri-
The present embodiment, is the hardware circuit of having simplified embodiment mono-, and a kind of control circuit hardware structure that one group of monochromatic warm LED chip group is carried out light modulation that can be used for controlling is provided.
As shown in Figure 3, LED light fixture Drive and Control Circuit comprises PWM controller 31, variable voltage source 33, driver 34 and constant current auxiliary circuit 35; PWM controller is provided with output, and variable voltage source 33 is provided with controlled end and output, and constant current auxiliary circuit 35 is provided with drive end and input; The output of PWM controller 31 connects the input of driver 34; The output of driver 34 connects the drive end of constant current auxiliary circuit 35; Constant current auxiliary circuit 35 is provided with the controlled end that input connects variable voltage source 33; The input of the output of variable voltage source 33 and constant current auxiliary circuit 35 forms the external interface 30 of LED light fixture Drive and Control Circuit.
The operation principle of this LED light fixture Drive and Control Circuit is: PWM controller 31 sends adjustable pulse signal, utilize driver 34 to control the work of constant current auxiliary circuit 35, constant current auxiliary circuit 35 in working order lower and variable voltage source 33 completes constant current control jointly, and variable voltage source 33 is for being subject to external signal to control, export variable Switching Power Supply.
The application of this LED light fixture Drive and Control Circuit is that the one group of monochromatic warm LED chip group of external interface 30 access in LED light fixture Drive and Control Circuit, then, by changing the duty ratio of the pulse signal of PWM controller 31 outputs, can reach light modulation effect.
Therefore, the utility model is utilizing variable voltage source 33 jointly to complete on the basis of constant current control with constant current auxiliary circuit 35, in conjunction with PWM controller 31, control variable voltage source 33 and the cooperative sequential of constant current auxiliary circuit 35, a kind of control circuit hardware structure that one group of monochromatic warm LED chip group is carried out light modulation that can be used for controlling is provided.And PWM controller 31, driver 34 all do not participate in the work of constant current control, relatively improved the stability that constant current is controlled.
Therein in an embodiment, constant current auxiliary circuit 35 comprises power NMOS pipe Q, error amplifier EA, reference power supply Vref and sampling resistor Rs, the source S of power NMOS pipe Q connects the inverting input of error amplifier EA and one end of sampling resistor Rs, the other end ground connection of sampling resistor Rs, reference power supply Vref connects the normal phase input end of error amplifier EA, the output of error amplifier EA connects the grid G of power NMOS pipe Q, the drain D of power NMOS pipe Q is as the input of constant current auxiliary circuit 35, the grid G of power NMOS pipe Q is as the controlled end of constant current auxiliary circuit 35.
Constant current auxiliary circuit 35 and the variable voltage source 33 of this concrete structure jointly realized constant current and controlled, and constant-current circuit, does not need DC-DC translation circuit relatively at present, and volume reduces relatively, also there is no the electromagnetic interference of extra circuits.
Between the output output high period of PWM controller 31, driver 34 driving power NMOS pipe Q conductings, the co-operation of variable voltage source 33 and constant current auxiliary circuit 35, concrete co-operation process is with reference to the co-operation of embodiment mono-variable voltage source 3 and the first constant current auxiliary circuit 6.
State in the use in the LED light fixture Drive and Control Circuit of constant current auxiliary circuit 35, driver 34 is the work of driving power NMOS pipe Q, therefore, driver 34 can adopt gate drivers, also can according to its effect, carry out other specific designs by those of ordinary skills.
Therein in an embodiment, between the controlled end of the input of constant current auxiliary circuit 35 and variable voltage source 33, be serially connected with in order analog to digital converter 61, decision circuit 62, digital to analog converter 63, the operation principle of this partial circuit is, the input terminal voltage value of constant current auxiliary circuit 35, through analog to digital converter 61, convert digital signal to and be given to decision circuit 62, on the low side when lower than a preset value through decision circuit 62 judgement, export one and represent that low level data are to digital to analog converter 63, digital to analog converter 63 output LOW voltage signals, therefore, the input voltage value of the controlled end of variable voltage source 33 is on the low side, force the voltage vcc of variable voltage source 33 outputs to raise, if higher when higher than another preset value through decision circuit 62 judgement, export data that represent high level to digital to analog converter 63, digital to analog converter 63 output HIGH voltage signals, therefore, the input voltage value of the controlled end of variable voltage source 33 is higher, forces the voltage vcc of variable voltage source 33 outputs to decline.This programme is by arranging by analog to digital converter 61, decision circuit 62, digital to analog converter 63, providing a kind of can, for adjusting the circuit hardware framework of input signal of the controlled end of variable voltage source 33, make the different multiple variable voltage source 33 of controlled end semaphore request go in the application's LED light fixture Drive and Control Circuit.
In an embodiment, the external interface 30 of this LED light fixture Drive and Control Circuit is connected with diode D3 therein.The purpose of this design is that, when external interface 30 connection LED chip groups are carried out work, diode D3 can absorb the spike that LED chip group line stray inductance causes.
In an embodiment, the external interface 30 of this LED light fixture Drive and Control Circuit is connected with decoupling capacitor C3 therein, the LED chip group connecting into for avoiding High-frequency Interference stream of pulses to cross.
Embodiment tetra-
As shown in Figure 3 and Figure 4, the present embodiment provides a kind of LED light fixture, and it comprises LED light fixture Drive and Control Circuit and one group of monochromatic warm LED lamp group 80 described in embodiment tri-, and LED lamp group 80 is connected to the external interface 30 of LED light fixture Drive and Control Circuit.
Three description can be known in conjunction with the embodiments, by adjusting the duty ratio (that is adjusting variable voltage source and the cooperative sequential of constant current auxiliary circuit) of the pulse signal of PWM controller 31 outputs, and can be so that LED light fixture reaches light modulation effect.Therefore, the present embodiment provides a kind of hardware structure that can be used for carrying out the LED light fixture of light modulation.
The above embodiment has only expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not therefore 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, the protection range of the utility model patent should be as the criterion with claims.
Claims (10)
1. a LED light fixture Drive and Control Circuit, is characterized in that, comprises PWM controller, MUX, variable voltage source, the first driver, the second driver, the first constant current auxiliary circuit and the second constant current auxiliary circuit; Described PWM controller is provided with the first output and the second output, described MUX is provided with the first selection input, second and selects input, two data input pins and an output, described variable voltage source is provided with controlled end and output, and described the first constant current auxiliary circuit, described the second constant current auxiliary circuit are respectively equipped with drive end and input; The first output of PWM controller connects the input of the first driver, the first selection input of MUX, and the second output of PWM controller connects the input of the second driver, the second selection input of MUX; The output of the first driver connects the drive end of the first constant current auxiliary circuit, and the output of the second driver connects the drive end of the second constant current auxiliary circuit; Two data input pins of MUX connect respectively the input of the first constant current auxiliary circuit, the input of the second constant current auxiliary circuit, and the output of MUX connects the controlled end of variable voltage source; The input of the input of the output of variable voltage source and the first constant current auxiliary circuit, the second constant current auxiliary circuit forms respectively the first external interface, the second external interface, and variable voltage source jointly completes constant current with the first constant current auxiliary circuit, the second constant current auxiliary circuit respectively and controls.
2. LED light fixture Drive and Control Circuit according to claim 1, it is characterized in that, described the first constant current auxiliary circuit comprises the first power NMOS pipe, the first error amplifier, the first reference power supply and the first sampling resistor, the source electrode of the first power NMOS pipe connects one end of inverting input and first sampling resistor of the first error amplifier, the other end ground connection of the first sampling resistor, the first reference power supply connects the normal phase input end of the first error amplifier, the output of the first error amplifier connects the grid of the first power NMOS pipe, the drain electrode of the first power NMOS pipe is as the input of described the first constant current auxiliary circuit, the grid of the first power NMOS pipe is as the controlled end of described the first constant current auxiliary circuit, described the second constant current auxiliary circuit comprises the second power NMOS pipe, the second error amplifier, the second reference power supply and the second sampling resistor, the source electrode of the second power NMOS pipe connects one end of inverting input and second sampling resistor of the second error amplifier, the other end ground connection of the second sampling resistor, the second reference power supply connects the normal phase input end of the second error amplifier, the output of the second error amplifier connects the grid of the second power NMOS pipe, the drain electrode of the second power NMOS pipe is as the input of described the second constant current auxiliary circuit, the grid of the second power NMOS pipe is as the controlled end of described the second constant current auxiliary circuit.
3. LED light fixture Drive and Control Circuit according to claim 1, it is characterized in that, described LED light fixture Drive and Control Circuit also comprises OD output NAND gate, OD output NAND gate is provided with two data input pins and an output, connect one to one respectively two data input pins of OD output NAND gate of the first output of PWM controller, the second output, the output of OD output NAND gate connects the drive end of the first constant current auxiliary circuit or the drive end of the second constant current auxiliary circuit.
4. LED light fixture Drive and Control Circuit according to claim 1, is characterized in that, between the output of described MUX and the controlled end of described variable voltage source, is serially connected with in order analog to digital converter, decision circuit, digital to analog converter.
5. according to the LED light fixture Drive and Control Circuit described in claim 1 to 4 any one, it is characterized in that, the first external interface, second external interface of described LED light fixture Drive and Control Circuit are connected with respectively diode.
6. according to the LED light fixture Drive and Control Circuit described in claim 1 to 4 any one, it is characterized in that, the first external interface, second external interface of described LED light fixture Drive and Control Circuit are connected with respectively decoupling capacitor.
7. a LED light fixture, it is characterized in that, comprise LED light fixture Drive and Control Circuit described in claim 1 to 4 any one and the LED lamp group of two groups of different-colours, the LED lamp group of two groups of different-colours is corresponding the first external interface and the second external interface that is connected to described LED light fixture Drive and Control Circuit respectively.
8. a LED light fixture Drive and Control Circuit, is characterized in that, comprises PWM controller, variable voltage source, driver and constant current auxiliary circuit; Described PWM controller is established output, and described variable voltage source is provided with controlled end and output, and described constant current auxiliary circuit is provided with drive end and input; The output of PWM controller connects the input of driver; The output of driver connects the drive end of constant current auxiliary circuit; Constant current auxiliary circuit is provided with the controlled end that input connects variable voltage source; The input of the output of variable voltage source and constant current auxiliary circuit forms external interface, and variable voltage source and constant current auxiliary circuit jointly complete constant current and control.
9. LED light fixture Drive and Control Circuit according to claim 8, it is characterized in that, described constant current auxiliary circuit comprises power NMOS pipe, error amplifier, reference power supply and sampling resistor, the source electrode of power NMOS pipe connects the inverting input of error amplifier and one end of sampling resistor, the other end ground connection of sampling resistor, reference power supply connects the normal phase input end of error amplifier, the output of error amplifier connects the grid of power NMOS pipe, the drain electrode of power NMOS pipe is as the input of described constant current auxiliary circuit, the grid of power NMOS pipe is as the controlled end of described constant current auxiliary circuit.
10. LED light fixture Drive and Control Circuit according to claim 8 or claim 9, is characterized in that, between the input of described constant current auxiliary circuit and the controlled end of described variable voltage source, is serially connected with in order analog to digital converter, decision circuit, digital to analog converter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420423286.XU CN203984748U (en) | 2014-07-29 | 2014-07-29 | LED light fixture Drive and Control Circuit and LED light fixture |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420423286.XU CN203984748U (en) | 2014-07-29 | 2014-07-29 | LED light fixture Drive and Control Circuit and LED light fixture |
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| CN203984748U true CN203984748U (en) | 2014-12-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105050298A (en) * | 2015-09-09 | 2015-11-11 | 广州达森灯光股份有限公司 | LED dimming circuit device |
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2014
- 2014-07-29 CN CN201420423286.XU patent/CN203984748U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105050298A (en) * | 2015-09-09 | 2015-11-11 | 广州达森灯光股份有限公司 | LED dimming circuit device |
| CN105050298B (en) * | 2015-09-09 | 2019-01-22 | 广州达森灯光股份有限公司 | LED light adjusting circuit device |
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Granted publication date: 20141203 Termination date: 20170729 |