CN105101514A - Analog dimming circuit for LED lighting - Google Patents
Analog dimming circuit for LED lighting Download PDFInfo
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- CN105101514A CN105101514A CN201410215029.1A CN201410215029A CN105101514A CN 105101514 A CN105101514 A CN 105101514A CN 201410215029 A CN201410215029 A CN 201410215029A CN 105101514 A CN105101514 A CN 105101514A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention provides an analog dimming circuit for LED lighting. The analog dimming circuit for the LED lighting comprises two voltage control current sources working at high-voltage and low-voltage control intervals, a turn-off time minimum timing part, an LED current sampling and diming compensation generation part; the turn-off time minimum timing part and the LED current sampling and diming compensation generation part are connected with the two voltage control current sources; the voltage control current source working at the high-voltage control interval provides an input current for the diming compensation generation part; and the voltage control current source working at the low-voltage control interval provides an input current for the diming compensation generation part and the turn-off time minimum timing part. The analog dimming circuit for the LED lighting enables a change of an LED input current in the whole control interval to be smooth; and when a control voltage is close to a turn-off voltage, a conductive circuit always exists and cannot be turned off, a diming lower limit is reduced then, and an LED diming range is broadened.
Description
Technical field
The present invention relates to field of analog integrated circuit, particularly a kind of analog light-adjusting circuit for LED illumination.
Background technology
LED is widely used due to its feature such as luminous efficiency height and long service life, and the application of light modulation can play its energy-conservation characteristic and increase the useful life of LED.
Simulation light modulation is one of main dimming mode of LED.Current LED simulates the many employings of light modulation and realizes by directly regulating the mode of the resistance that to be in series with LED.But the simulation dimming mode of this form cannot adapt to all kinds of novel LED type of drive, as worked in the high-accuracy and constant current control LED drive circuit of critical current mode pattern.
Based on the LED drive circuit working in critical current mode pattern of buck converter principle, its energy storage inductor and LED strip join, and are connected to ground by transistor switch mosfet, and when transistor MOSFET opens, power supply is to induction charging, and inductive current linearly rises.After inductive current reaches peak value, transistor switch mosfet disconnects, and inductance releases energy, and inductive current linearly declines.After inductive current drops to zero, transistor switch mosfet is opened again, restarts circulation, and the change of this process inductive current as shown in Figure 4.Final LED drive circuit reaches dynamic equilibrium, and LED current accurately equals the half of inductive current peak electric current.
In above-mentioned LED type of drive, the simple resistance changing series connection cannot change the size of current of LED, wants to change LED current, needs the inductive current detection threshold changing drive circuit.But when outside dimmer voltage is close to shutoff voltage value, current detection threshold minimum value can not arrange again too low.If because arrange too low, LED drives may due to problems such as process deviations, just LED current can be turned off when outside analog control voltage does not also reach shutoff voltage value, and current detection threshold minimum value arrange higher, can reduce again the light modulation excursion of LED.
Summary of the invention
The object of this invention is to provide a kind of analog light-adjusting circuit for LED illumination, be adapted to the LED drive circuit being operated in critical current mode pattern, make analog light-adjusting circuit LED output current change in whole control interval level and smooth; In control voltage close to there is turning circuit during shutoff voltage all the time and don't can turning off.
In order to achieve the above object, the invention provides a kind of analog light-adjusting circuit for LED illumination, comprising:
Work in two voltage-controlled current sources in high pressure and low voltage control interval, and the turn-off time minimum value timing piece be connected with described two voltage-controlled current sources, LED current is sampled and light modulation compensates production part; Wherein,
The described voltage-controlled current source working in high voltage control interval provides input current for described light modulation compensates production part;
The described voltage-controlled current source working in low voltage control interval compensates production part for described light modulation and described turn-off time minimum value timing piece provides input current.
Wherein, the voltage-controlled current source working in high voltage control interval described in comprises: the first transistor M1, transistor seconds M2, the first resistance R1, the second resistance R2, the 5th resistance R5 and current source I1; Wherein,
The grid of described the first transistor M1 meets high-order reference voltage REF2, and drain electrode connects one end of described 5th resistance R5, and source electrode connects one end of described first resistance R1, the other end ground connection of wherein said 5th resistance R5;
The grid of described transistor seconds M2 meets control voltage DIM, and source electrode connects one end of described second resistance R2;
Described current source I1 is as input current source, wherein said first resistance R1 and the second resistance R2 parallel connection is shunted described current source I1, the output current of described transistor seconds M2 is the shunting I3 of described input current source I1, is inversely proportional to described control voltage DIM.
Wherein, the voltage-controlled current source working in low voltage control interval described in comprises: third transistor M3, the 4th transistor M4, the 3rd resistance R3, the 4th resistance R4, current source I2, and the mirror image circuit be made up of the 5th transistor M5, the 6th transistor M6; Wherein,
The grid of described third transistor M3 meets described control voltage DIM, and source electrode connects one end of described 3rd resistance R3;
The grid of described 4th transistor M4 meets low level reference voltage REF1, and source electrode connects one end of described 4th resistance R4, and drain electrode connects the drain electrode of described 5th transistor M5;
The gate interconnection of described 5th transistor M5 and described 6th transistor M6, source grounding, the grid of wherein said 5th transistor M5 is connected with drain electrode;
Described current source I2 is as input current source, wherein said 3rd resistance R3 and the 4th resistance R4 parallel connection is shunted described current source I2, the output current of described third transistor M3 is the shunting I4 of described input current source I2, be inversely proportional to described control voltage DIM, the output current of described 4th transistor M4 is another shunting I5 of described input current source I2, is directly proportional to described control voltage DIM.
Wherein, described electric current I 3 is output current I with I4 sum
dIM1, described electric current I 5, through described mirror image circuit, obtains output current I
dIM2.
Wherein, described turn-off time minimum value timing piece comprises: the first electric capacity C1, the 7th transistor M7, the first comparator Comp1; Wherein,
The drain electrode of the 7th transistor M7 described in one termination of described first electric capacity C1 and the positive input terminal of the first comparator Comp1, other end ground connection, wherein said output current I
dIM2described first electric capacity C1 is charged;
The grid of described 7th transistor M7 meets control signal TC, source ground;
The negative input termination voltage REF3 of described first comparator Comp1.
Wherein, described LED current sampling and light modulation compensation production part comprise: the 8th transistor M8, the 5th resistance R
cS, the 6th resistance R6, the second comparator Comp2, and the loop be made up of LED, inductance L, diode D1; Wherein,
The grid of described 8th transistor M8 meets described control signal TC, and drain electrode connects described loop, and source electrode meets described 5th resistance R
cSone end, wherein said 5th resistance R
cSother end ground connection;
The source electrode of the 8th transistor M8 described in one termination of described 6th resistance R6, the negative input end of the second comparator Comp2 described in another termination, wherein said output current I
dIM1the voltage of control and compensation the 6th resistance R6, the positive input termination voltage REF4 of described second comparator Comp2;
A second electric capacity C2 in parallel with described LED is also comprised in wherein said loop.
The beneficial effect of technique scheme of the present invention is as follows:
In such scheme, analog light-adjusting circuit for LED illumination comprises: two voltage-controlled current sources working in high pressure and low voltage control interval, and the turn-off time minimum value timing piece be connected with described two voltage-controlled current sources, LED current is sampled and light modulation compensates production part; This analog light-adjusting circuit is adapted to the LED drive circuit being operated in critical current mode pattern, and analog light-adjusting circuit LED output current change in whole control interval is level and smooth; In control voltage close to there is turning circuit during shutoff voltage all the time and don't can turning off.
Accompanying drawing explanation
Fig. 1 represents in the embodiment of the present invention for working in the circuit diagram of two voltage-controlled current sources of high pressure and low voltage control interval in the analog light-adjusting circuit of LED illumination;
Fig. 2 represents the circuit diagram for turn-off time minimum value timing piece in the analog light-adjusting circuit of LED illumination in the embodiment of the present invention;
Fig. 3 represents the circuit diagram for LED current sampling in the analog light-adjusting circuit of LED illumination and light modulation compensation production part in the embodiment of the present invention;
Fig. 4 represents two kinds of inductive current operating state oscillograms that the LED that the embodiment of the present invention is suitable for drives;
Fig. 5 represents in the embodiment of the present invention for change oscillograms such as the External Control Voltage of the analog light-adjusting circuit of LED illumination, output current and corresponding bucking voltages;
Fig. 6 represents that the embodiment of the present invention is used for along with External Control Voltage change in the analog light-adjusting circuit of LED illumination, LED current and inductive current change oscillogram.
Embodiment
For making the technical problem to be solved in the present invention, technical scheme and advantage clearly, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
The present invention is directed to the problem that current LED simulation dimming mode cannot adapt to work in the high-accuracy and constant current control LED drive circuit of critical current mode pattern, provide a kind of analog light-adjusting circuit for LED illumination.
Embodiments provide a kind of analog light-adjusting circuit for LED illumination, comprising:
Work in two voltage-controlled current sources in high pressure and low voltage control interval, and the turn-off time minimum value timing piece be connected with described two voltage-controlled current sources, LED current is sampled and light modulation compensates production part;
In the embodiment of the present invention, voltage-controlled current source consists of: reference current source is as input current source; A pair PMOS is shunted reference current as differential input stage; Input stage one termination External Control Voltage; Another termination reference voltage of input stage, the size of reference voltage is the mid point of corresponding voltage control interval; The transistor that resistance on each branch road or grid leak are connected is biased; Grid connects the transistor output current of External Control Voltage and control voltage is inversely proportional to, and is light modulation offset current; The transistor output current that grid connects reference voltage is directly proportional to control voltage.Voltage-controlled current source is different according to reference voltage, is divided into high pressure and low voltage control interval; By arranging resistance, make the output current change in corresponding operation interval of two voltage-controlled current sources; And in non-corresponding interval, control voltage changes, output current size is constant.
Particularly, as shown in Figure 1, the voltage-controlled current source working in high voltage control interval described in comprises: the first transistor M1, transistor seconds M2, the first resistance R1, the second resistance R2, the 5th resistance R5 and current source I1;
The grid of described the first transistor M1 meets high-order reference voltage REF2, and drain electrode connects one end of described 5th resistance R5, and source electrode connects one end of described first resistance R1, the other end ground connection of wherein said 5th resistance R5; The grid of described transistor seconds M2 meets control voltage DIM, and source electrode connects one end of described second resistance R2; Described current source I1 is as input current source, wherein said first resistance R1 and the second resistance R2 parallel connection is shunted described current source I1, the output current of described transistor seconds M2 is the shunting I3 of described input current source I1, is inversely proportional in high voltage control interval with described voltage DIM.
The described voltage-controlled current source working in low voltage control interval comprises: third transistor M3, the 4th transistor M4, the 3rd resistance R3, the 4th resistance R4, current source I2, and the mirror image circuit be made up of the 5th transistor M5, the 6th transistor M6;
The grid of described third transistor M3 meets described control voltage DIM, and source electrode connects one end of described 3rd resistance R3; The grid of described 4th transistor M4 meets low level reference voltage REF1, and source electrode connects one end of described 4th resistance R4, and drain electrode connects the drain electrode of described 5th transistor M5; The gate interconnection of described 5th transistor M5 and described 6th transistor M6, source grounding, the grid of wherein said 5th transistor M5 is connected with drain electrode; Described current source I2 is as input current source, wherein said 3rd resistance R3 and the 4th resistance R4 parallel connection is shunted described current source I2, the output current of described third transistor M3 is the shunting I4 of described input current source I2, be inversely proportional to described voltage DIM in low voltage control interval, the output current of described 4th transistor M4 is another shunting I5 of described input current source I2, is directly proportional in low voltage control interval to described voltage DIM.
Described electric current I 3 is output current I with I4 sum
dIM1, described electric current I 5, through described mirror image circuit, obtains output current I
dIM2.
Particularly, the voltage-controlled current source being operated in high voltage control interval exports the light modulation offset current I3 be inversely proportional to voltage DIM; The voltage-controlled current source being operated in low voltage control interval exports the electric current of two inverse variation, is respectively the light modulation offset current be inversely proportional to voltage DIM and exports I4 and the chrono-amperometric that is directly proportional exports I5.Concrete curent change as shown in Figure 3, wherein output current I
dIM1sum is exported, for the size of control and compensation voltage for being operated in the light modulation offset current be inversely proportional to voltage DIM in height two control intervals; Output current I
dIM2for the voltage-controlled current source being operated in low pressure exports, its size is directly proportional to voltage DIM, for controlling the minimum turn-off time.
As shown in Figure 2, described turn-off time minimum value timing piece comprises: the first electric capacity C1, the 7th transistor M7, the first comparator Comp1;
Output current I
dIM2be that the first electric capacity C1 charges, capacitor charging end is connected to the drain electrode of the 7th transistor M7 and the positive input terminal of the first comparator Comp1.The grid end of the 7th transistor M7 connects power tube control signal TC, and have no progeny when power tube closes, TC saltus step is electronegative potential, electric current I
dIM2first electric capacity C1 is charged.After the voltage of the first electric capacity C1 is charged to and is greater than reference voltage REF3, it is high potential that the first comparator Comp1 exports saltus step.The time that the voltage of the first electric capacity C1 is charged to REF3 is the power tube minimum turn-off time, its size and electric current I
dIM2be inversely proportional to, be namely inversely proportional to DIM terminal voltage.
As shown in Figure 3, described LED current sampling and light modulation compensation production part comprise: the 8th transistor M8, the 5th resistance R
cS, the 6th resistance R6, the second comparator Comp2, and the loop be made up of LED, inductance L, diode D1, also comprise a second electric capacity C2 in parallel with described LED in described loop.
The grid of described 8th transistor M8 meets described control signal TC, and drain electrode connects described loop, and source electrode meets described 5th resistance R
cSone end, wherein said 5th resistance R
cSother end ground connection; The source electrode of the 8th transistor M8 described in one termination of described 6th resistance R6, the negative input end of the second comparator Comp2 described in another termination, wherein said output current I
dIM1the voltage of control and compensation the 6th resistance R6, the positive input termination voltage REF4 of described second comparator Comp2;
Particularly, the 5th resistance R
cSfor sampling resistor, the 6th resistance R6 is compensating resistance, sampling resistor R
cSbe connected with the 8th transistor M8 and carry out current sample, CS end is sampling end.CS end connects compensating resistance R6, electric current I
dIM1flow through compensating resistance R6 and produce bucking voltage △ V
cS.The negative input end of the second comparator Comp2 connects compensating resistance R6, and its voltage is sampled voltage V
cSwith bucking voltage △ V
cSsum.Second comparator Comp2 positive input terminal connects reference voltage REF4, and its value is maximum current detection threshold.Actual CS holds current detection threshold to be REF4 and bucking voltage △ V
cSdifference.When the 8th transistor M8 opens, inductive current linearly rises, R
cSon sampled voltage linearly rise thereupon.After sampled voltage is greater than CS end current detection threshold, it is electronegative potential that the second comparator Comp2 exports saltus step, and make power tube control signal TC saltus step be electronegative potential, the 8th transistor M8 turns off thereupon.Afterwards, LED, energy storage inductor L, diode D1 form a loop, and inductive current linearly declines.
When DIM voltage is higher, bucking voltage △ V
cSless, the minimum turn-off time is less, and the time that inductive current drops to zero is greater than the minimum turn-off time, and LED drive circuit is operated in inductive circuit critical conduction mode.After inductive current drops to zero, the 8th transistor M8 opens, and external power source charges again to energy storage inductor L, and inductive current linearly rises again.When DIM voltage drop, enter low voltage control interval, bucking voltage △ V
cSincrease with the minimum turn-off time thereupon.Due to bucking voltage △ V
cSincrease, energy storage inductor current peak is declined, the discharge and recharge time of inductance reduces.The time dropping to zero when inductive current is less than the minimum turn-off time, and LED drive circuit changes into and is operated in discontinous mode, and LED current is declined further, reduces light modulation lower limit, widens dimming scope.
The simulation dimming arrangement of the embodiment of the present invention has two kinds of light modulation mechanism, and first is the inductance peak current change between the whole district, by output current I
dIM1control and compensation voltage controls, as shown in Figure 5 and Figure 6.Second is the minimum turn-off time controling in low voltage control interval, and it is discontinous mode that LED is driven by critical current mode Mode change, and carry out corresponding light modulation, inductive current specifically as shown in Figure 4.
Such scheme of the present invention, two that control with the external analog voltages signal DIM difference form voltage-controlled current source output currents being operated in different control interval, control the bucking voltage △ V of current detection threshold
cSsize and the MOSFET minimum turn-off time.Compared with prior art, this programme is the LED drive circuit being adapted to be operated in critical current mode pattern, and dimming effect is level and smooth in whole DIM voltage control interval change, can carry out accurate light modulation.Arrange a DIM shutoff voltage, when DIM voltage is lower than shutoff voltage, LED drive circuit is closed, and when DIM voltage is close to shutoff voltage, LED current reduces, but there is On current all the time and can not turn off.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. the analog light-adjusting circuit for LED illumination, it is characterized in that, comprise: two voltage-controlled current sources working in high pressure and low voltage control interval, and the turn-off time minimum value timing piece be connected with described two voltage-controlled current sources, LED current is sampled and light modulation compensates production part; Wherein,
The described voltage-controlled current source working in high voltage control interval provides input current for described light modulation compensates production part;
The described voltage-controlled current source working in low voltage control interval compensates production part for described light modulation and described turn-off time minimum value timing piece provides input current.
2. the analog light-adjusting circuit for LED illumination according to claim 1, it is characterized in that, described in work in high voltage control interval voltage-controlled current source comprise: the first transistor (M1), transistor seconds (M2), the first resistance (R1), the second resistance (R2), the 5th resistance (R5) and current source (I1); Wherein,
The grid of described the first transistor (M1) connects high-order reference voltage (REF2), and drain electrode connects one end of described 5th resistance (R5), and source electrode connects one end of described first resistance (R1), the other end ground connection of wherein said 5th resistance (R5);
The grid of described transistor seconds (M2) connects control voltage (DIM), and source electrode connects one end of described second resistance (R2);
Described current source (I1) is as input current source, wherein said first resistance (R1) and the second resistance (R2) parallel connection are shunted described current source (I1), the output current of described transistor seconds (M2) is the shunting (I3) of described input current source (I1), is inversely proportional to described control voltage (DIM).
3. the analog light-adjusting circuit for LED illumination according to claim 2, it is characterized in that, the described voltage-controlled current source working in low voltage control interval comprises: third transistor (M3), the 4th transistor (M4), the 3rd resistance (R3), the 4th resistance (R4), current source (I2), and the mirror image circuit be made up of the 5th transistor (M5), the 6th transistor (M6); Wherein,
The grid of described third transistor (M3) connects described control voltage (DIM), and source electrode connects one end of described 3rd resistance (R3);
The grid of described 4th transistor (M4) connects low level reference voltage (REF1), and source electrode connects one end of described 4th resistance (R4), and drain electrode connects the drain electrode of described 5th transistor (M5);
The gate interconnection of described 5th transistor (M5) and described 6th transistor (M6), source grounding, the grid of wherein said 5th transistor (M5) is connected with drain electrode;
Described current source (I2) is as input current source, wherein said 3rd resistance (R3) and the parallel connection of the 4th resistance (R4) are shunted described current source (I2), the output current of described third transistor (M3) is the shunting (I4) of described input current source (I2), be inversely proportional to described control voltage (DIM), the output current of described 4th transistor (M4) is another shunting (I5) of described input current source (I2), is directly proportional to described control voltage (DIM).
4. the analog light-adjusting circuit for LED illumination according to claim 3, is characterized in that, described electric current (I3) and (I4) sum are output current (I
dIM1), described electric current (I5), through described mirror image circuit, obtains output current (I
dIM2).
5. the analog light-adjusting circuit for LED illumination according to claim 4, is characterized in that, described turn-off time minimum value timing piece comprises: the first electric capacity (C1), the 7th transistor (M7), the first comparator (Comp1); Wherein,
The drain electrode of the 7th transistor (M7) described in one termination of described first electric capacity (C1) and the positive input terminal of the first comparator (Comp1), other end ground connection, wherein said output current (I
dIM2) described first electric capacity (C1) is charged;
The grid of described 7th transistor (M7) connects control signal (TC), source ground;
The negative input termination voltage (REF3) of described first comparator (Comp1).
6. the analog light-adjusting circuit for LED illumination according to claim 4, is characterized in that, described LED current sampling and light modulation compensate production part and comprise: the 8th transistor (M8), the 5th resistance (R
cS), the 6th resistance (R6), the second comparator (Comp2), and the loop be made up of light-emitting diode (LED), inductance (L), diode (D1); Wherein,
The grid of described 8th transistor (M8) connects described control signal (TC), and drain electrode connects described loop, and source electrode meets described 5th resistance (R
cS) one end, wherein said 5th resistance (R
cS) other end ground connection;
The source electrode of the 8th transistor (M8) described in one termination of described 6th resistance (R6), the negative input end of the second comparator (Comp2) described in another termination, wherein said output current (I
dIM1) voltage of control and compensation the 6th resistance (R6), the positive input termination voltage (REF4) of described second comparator (Comp2);
Second electric capacity (C2) in parallel with described light-emitting diode (LED) is also comprised in wherein said loop.
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| CN201410215029.1A CN105101514B (en) | 2014-05-21 | 2014-05-21 | A kind of analog light-adjusting circuit for LED illuminations |
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| CN201410215029.1A CN105101514B (en) | 2014-05-21 | 2014-05-21 | A kind of analog light-adjusting circuit for LED illuminations |
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| CN105101514B CN105101514B (en) | 2018-04-13 |
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| CN110505729A (en) * | 2018-05-18 | 2019-11-26 | 华润矽威科技（上海）有限公司 | Improve the modulation circuit and its modulator approach of LED light modulation depth |
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