CN103167676A - Light-emitting diode (LED) light adjustment control circuit and LED lamp with light adjustment control circuit - Google Patents
Light-emitting diode (LED) light adjustment control circuit and LED lamp with light adjustment control circuit Download PDFInfo
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Abstract
The invention provides a light-emitting diode (LED) light adjustment control circuit. A digital-to-analogue conversion sub-module (141) of a light adjustment control module (104) is used for converting pulse-width modulation (PWM) signals, of a certain duty ratio, output by a control module (102) into analog voltage, and the analog voltage is input into a non-inverting input end of a comparator (AR1). The comparator (AR1) is used for comparing the analog voltage and sampling voltage of an inverted input end, namely, the magnitude of output currents of a constant-current drive module. After the duty ratio of the PWM signals is confirmed, if the sampling voltage is larger than the analog voltage, an optical coupler (142) feeds a control signal back to a power conversion module and controls the power conversion module to reduce output currents, namely, reduces the sampling voltage, until the sampling voltage of the non-inverting input end of the comparator (AR1) is equal to the analog voltage obtained after the PWM signals are converted, and therefore accuracy of the output currents of the circuit is realized. The invention provides a lamp utilizing the LED light adjustment control circuit. Accurate control of input currents of the LED lamp can be realized, and therefore luminance of the LED lamp can be accurately adjusted.
Description
Technical field
The present invention relates to answer lighting technical field, relate in particular to a kind of LED adjusting control circuit and have the LED light fixture of this adjusting control circuit.
Background technology
At present, the LED light regulating technology mainly comprises two kinds: a kind of amplitude by linear regulation LED output current changes the light output of LED, namely simulates light modulation; Another kind of for using switching circuit with sufficiently high frequency work with respect to eye recognition power, use PWM(Pulse Width Modulation, pulse width modulation) mean value that cycle and duty cycle change light output, i.e. digital dimming be set.
Compare with the simulation light modulation, digital dimming has higher light modulation precision, but because digital dimming can be introduced potential electromagnetic interference frequency, in the higher place of these EMC Requirements of the public lighting systems such as street lamp, Tunnel Lamp, is not suitable for using digital dimming.But simultaneously, uses the precision of output current of the simulation light modulation meeting reduction light adjusting circuit of general linear regulation, can't guarantee the fine adjustment of lamp brightness.
Summary of the invention
Technical problem to be solved by this invention is, a kind of LED adjusting control circuit is provided and has the LED light fixture of this adjusting control circuit, can accurately control the output current of LED adjusting control circuit, thereby accurately control the brightness of LED light fixture.
In order to solve the problems of the technologies described above, the embodiment of the present invention provides a kind of LED adjusting control circuit on the one hand, comprising:
be used for external AC power supply is converted to the power conversion module of constant output current, and the control module (102) that is used for exporting according to the brightness adjustment control instruction pulse width modulating signal of corresponding duty ratio, also comprise dimming controlling module (104), described dimming controlling module (104) comprises the digital-to-analogue conversion submodule (141) that is converted to analog signal for the pulse width modulating signal with described control module (102) output, comparator (AR1), optical coupler (142), sampling resistor (Rs), the first end of described sampling resistor (Rs) is connected with the output of described power conversion module, the second end ground connection, the inverting input of described comparator (AR1) is connected in the node between the output of described sampling resistor (Rs) and described power conversion module, the in-phase input end of described comparator (AR1) connects the output of described control module (102) by described digital-to-analogue conversion submodule (141), the output of described comparator (AR1) is connected with the first input end of described optical coupler (142), the second input external power supply (VCC) of described optical coupler (142), the output of this optical coupler (142) is connected with the feedback end of described power conversion module.
Wherein, described power conversion module comprises: the constant pressure source module (101) that is used for AC power is converted to DC power supply, and the constant-current driven module (103) that is used for providing to light fixture electric current, the output of described constant pressure source module (101) is connected with the input of described constant-current driven module (103); The feedback end of described constant-current driven module (103) is connected with the output of described optical coupler (142).
wherein, described digital-to-analogue conversion submodule (141) comprises inverter (U1), triode (Q1), the first to the 3rd divider resistance (R1, R2, R3), and electric capacity (C1), the base stage of described field effect transistor (Q1) connects the output of described control module (102) by described inverter (U1), the collector electrode of described field effect transistor (Q1) is by the first divider resistance (R1) external power supply (VCC), the grounded emitter of described field effect transistor (Q1), one end of the series circuit that is made of the series connection of described the second divider resistance (R2) and the 3rd divider resistance (R3) is connected in the collector electrode of described triode (Q1), other end ground connection, described electric capacity (C1) is in parallel with described the 3rd divider resistance (R3), the in-phase input end of described comparator (AR1) is connected in the node between described the second divider resistance (R2) and the 3rd divider resistance (R3).
wherein, described LED adjusting control circuit also comprises the first to the 3rd current-limiting resistance (R4, R5, R6), the inverting input of described comparator (AR1) is connected in the node between the output of described sampling resistor (Rs) and described constant-current driven module (103) by described the first divider resistance (R4), the second input of described optical coupler (142) is by described the second divider resistance (R5) external power supply (VCC), the output of described optical coupler module (142) is connected in the second input of described constant-current driven module (103) by described the 3rd current-limiting resistance (R6).
Wherein, when the duty ratio of described pwm control signal was 100%, the output current of described constant-current driven module (103) was maximum.
Wherein, when the duty ratio of described pwm control signal was 0%, the output current of described constant-current driven module (103) was minimum.
Wherein, described constant pressure source module (101) comprises APFC.
Wherein, described control module (102) is the single-chip microcomputer of Atmega88 for model.
A kind of LED light fixture with adjusting control circuit comprises light-emitting diode (LED) module, and above-mentioned adjusting control circuit, and described light-emitting diode (LED) module is connected with the power conversion module of described adjusting control circuit.
Implement the embodiment of the present invention, have following beneficial effect:
implement LED adjusting control circuit of the present invention and the LED light fixture with this light adjusting circuit, by by the digital-to-analogue conversion submodule 141 of dimming controlling module 104, the pwm signal of certain duty ratio of control module 102 outputs being converted to the in-phase input end of input comparator AR1 after aanalogvoltage, come the relatively sampled voltage of this aanalogvoltage and inverting input by this comparator AR1 again, after the duty ratio of this pwm signal is determined, send a control signal by optical coupler 142 to power conversion module, control its output current, thereby adjusting sampled voltage, until the sampled voltage of comparator AR1 inverting input equals the aanalogvoltage that this pwm signal is converted to, realize the accurate control of LED light fixture input current, and then the brightness of accurate adjustment LED light fixture.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or description of the Prior Art, apparently, accompanying drawing in the following describes is only part embodiment of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the system principle diagram of an embodiment of LED adjusting control circuit of the present invention;
Fig. 2 is the circuit theory diagrams of an embodiment of LED adjusting control circuit of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Referring to Fig. 1, be the circuit theory diagrams of an embodiment of LED adjusting control circuit of the present invention.during concrete enforcement, this LED adjusting control circuit of the embodiment of the present invention comprises: power conversion module, dimming controlling module 104 and be used for control signal module 102 according to the pulse width modulating signal of the corresponding duty ratio of brightness adjustment control instruction output, power conversion module is used for the outside input is converted to the constant output of suitable size, contrasted again the output of these constant outputs and control signal module 102 by dimming controlling module 104, and provide feedback signal according to comparing result to power conversion module, according to this feedback signal, secondary being carried out in the constant output after changing by this power conversion module 101 again regulates, the fine adjustment of realization to LED illuminating circuit input power, wherein, this dimming controlling module 104 comprises the digital-to-analogue conversion submodule (141) that is converted to analog signal for the pulse width modulating signal with described control module (102) output, comparator (AR1), optical coupler (142), sampling resistor (Rs), the first end of described sampling resistor (Rs) is connected with the output of described power conversion module, the second end ground connection, the inverting input of described comparator (AR1) is connected in the node between the output of described sampling resistor (Rs) and described power conversion module, the in-phase input end of described comparator (AR1) connects the output of described control module (102) by described digital-to-analogue conversion submodule (141), the output of described comparator (AR1) is connected with the first input end of described optical coupler (142), the second input external power supply (VCC) of described optical coupler (142), the output of this optical coupler (142) is connected with the feedback end of described power conversion module.
Referring to Fig. 1, the power conversion module of this LED adjusting control circuit of the embodiment of the present invention comprises for the constant pressure source module 101 that alternating voltage is converted to direct voltage, and the constant-current driven module 103 that is used for providing to light fixture electric current, the output of this constant pressure source module 101 is connected with the input of constant-current driven module 102; The feedback end of constant-current driven module (103) is connected with the output of described optical coupler (142).
referring to Fig. 1, in one embodiment, the digital-to-analogue conversion submodule 141 of the dimming controlling module 104 of the embodiment of the present invention comprises inverter U1, triode Q1, the first to the 3rd divider resistance R1, R2, R3, capacitor C 1, the b utmost point of triode Q1 is connected with the output of inverter U1, the input of this inverter U1 is connected with the output of control module 102, the e utmost point ground connection of this triode Q1, the c utmost point is by the first divider resistance R1 external power supply VCC, one end of the series circuit that is made of the second divider resistance R2 and the 3rd divider resistance R3 series connection is connected in the c utmost point of triode Q1 and the node between the first divider resistance R1, other end ground connection, capacitor C 1 is connected in parallel on the two ends of the 3rd divider resistance R3, the in-phase input end of comparator AR1 is connected in the node between this second divider resistance R2 and the 3rd divider resistance R3.
The constant pressure source module 101 of the embodiment of the present invention is with APFC(Active Power Factor Correction, APFC) constant pressure source modules A C/DC101, the external 220V AC power of input of this constant pressure source modules A C/DC101.Control module 102 in the embodiment of the present invention adopts Atmega88MCU.
In one embodiment, this dimming controlling module 104 also comprises the first to the 3rd current-limiting resistance R4, R5, R6, and the inverting input of comparator AR1 is connected in series in node between sampling resistor Rs and constant-current driven module 103 outputs by this first current-limiting resistance R4; The second input of optical coupler 142 is by this second current-limiting resistance R5 external power supply VCC, and its output is connected in the second input of constant-current driven module DC/DC103 by the 3rd current-limiting resistance R6.
implement the LED adjusting control circuit of the embodiment of the present invention, by the PWM(Pulse Width Modulation that control module 102 is exported by the digital-to-analogue conversion submodule 141 of dimming controlling module 104, pulse width modulation) signal is converted to the in-phase input end of input comparator AR1 after aanalogvoltage, come the relatively size of the sampled voltage of this aanalogvoltage and inverting input by this comparator AR1 again, after the duty ratio of this pwm signal is determined, if sampled voltage is greater than aanalogvoltage, feed back a control signal by optical coupler 142 to constant-current driven module 103, control it and reduce output current, namely reduce sampled voltage, until the sampled voltage of comparator AR1 inverting input equals the aanalogvoltage that this pwm signal is converted to, thereby realize the accurate control of LED light fixture input current, and then the brightness of accurate adjustment LED light fixture.Based on above-mentioned LED adjusting control circuit, the present invention also provides a kind of LED light fixture with above-mentioned adjusting control circuit.
Referring to Fig. 2, be the circuit theory diagrams of an embodiment of the LED light fixture with adjusting control circuit of the present invention.During concrete enforcement, this LED light fixture of the embodiment of the present invention comprises LED module, and the adjusting control circuit of above-described embodiment, this LED module is connected with the constant-current driven module 103 of this adjusting control circuit, and namely the anode of the LED in this LED module is connected with negative electrode with the both positive and negative polarity of this constant-current driven module 103 and is connected.
Be described in detail below in conjunction with the LED adjusting control circuit of operation principle to the embodiment of the present invention.
Referring to Fig. 1 and Fig. 2, in the embodiment of the present invention, when the pwm signal of the certain duty ratio of Atmega88MCU output, after process inverter U1 is anti-phase, the b utmost point of access triode Q1, control conducting or the shutoff of triode Q1.
When this triode Q1 turn-offed, the voltage V+ of the in-phase input end of comparator AR1 was:
V+ =
，
When triode Q1 conducting, the voltage V+ of the in-phase input end of comparator AR1 is:
V+=
，
In the embodiment of the present invention, the sampled voltage Vs of the inverting input of comparator AR1 is:
receive the light modulation instruction of the reduction LED lamp brightness that control centre sends when the Atmega88 single-chip microcomputer after, sending duty ratio to dimming controlling module 104 is the pwm signal of η, the pwm signal that is η by this dimming controlling module 104 according to this duty ratio again sends corresponding control signal to constant-current driven module DC/DC103, thereby this constant-current driven module DC/DC103 reduces the electric current of its output, the pwm signal that is namely η by the digital-to-analogue conversion submodule 141 of dimming controlling module 104 with this duty ratio is converted to the in-phase input end of aanalogvoltage V+ input terminal comparator AR1, the sampled voltage Vs that relatively obtains its inverting input as comparator AR1 is during greater than the voltage V+ of in-phase input end, the output output low level of comparator AR1, thereby optical coupler 142 conductings, and export a control signal to constant-current driven module DC/DC103 by protective resistance R6, thereby this constant-current driven module 103 begins to reduce its output current, because the output current of constant-current driven module 103 reduces, therefore, the sampled voltage Vs at sampling resistor Rs two ends reduces, until this sampled voltage Vs is reduced to when equating with this aanalogvoltage V+, this comparator AR1 no-output, be that optical coupler 142 is not worked, thereby can not transmit control signal again and control it to constant-current driven module DC/DC103 and reduce output current, thereby complete light modulation, that namely adjusts is accurately recently accurately controlled by the duty of this pwm signal:
1) when the duty ratio η of pwm signal is 100%, be low level after this pwm signal is anti-phase through inverter U1, it is the b low level very of triode Q1, make triode Q1 turn-off, this moment comparator AR1 in-phase input end voltage V+ and the terminal voltage Vc of capacitor C 1, namely the voltage VR3 at the 3rd divider resistance R3 two ends is:
Be the voltage of the in-phase input end of comparator AR1:
(3),
Preset the ratio between sampling resistor Rs and the first to the 3rd divider resistance R1, R2, R3 in the present embodiment, sampled voltage Vs=V when making beginning
+ max, this moment comparator AR1 output no-output, i.e. optical coupler 142 not conductings can not give constant-current driven module DC/DC103 control signal, thereby constant-current driven module DC/DC103 can not reduce its output current, at this moment its output current
Maximum:
。
2) when the duty ratio of pwm signal is 0%, this pwm signal is high level after inverter U1 is anti-phase, it is the b high level very of triode Q1, make triode Q1 conducting, capacitor C 1 discharge this moment, because the saturation voltage drop of triode Q1 is Uceo, therefore, the in-phase input end magnitude of voltage of comparator AR1:
Sampled voltage Vs=V during due to beginning
+ max, therefore, this moment, comparator AR1 relatively obtained
, output low level, optical coupler 142 conductings, and export a signal to constant-current driven module DC/DC103 by protective resistance R6, make its control reduce its output current, thereby reduce sampled voltage Vs, until satisfy
The time, comparator AR1 no-output, optical coupler 142 is not worked, and constant-current driven module 103 also no longer reduces output current, at this moment, can get minimum output current
,
3) when the duty ratio 100% of pwm signal〉η〉0% the time, in the one-period of pwm signal, when triode Q1 turn-offs, capacitor C 1 charging; During triode Q1 conducting, capacitor C 1 discharge, the average voltage at capacitor C 1 two ends is:
Wherein, η is the duty ratio of pwm signal,
" empty short " according to comparator AR1 will make the voltage V+ of comparator AR1 in-phase input end identical with sampled voltage Vs, namely as can be known
Can be got by formula (1), (3), (6), (7), this moment constant-current driven module DC/DC103 output current,
Hence one can see that, as long as determine resistance and the resistance of sampling resistor Rs and the magnitude of voltage of external power supply VCC of the first to the 3rd divider resistance R1, R2, R3, the output current I of constant-current driven module DC/DC103 is accurately controlled by the duty ratio of pwm signal fully.
implement the LED adjusting control circuit of the embodiment of the present invention, by by the digital-to-analogue conversion submodule 141 of dimming controlling module 104, the pwm signal of certain duty ratio of control module 102 outputs being converted to the in-phase input end of input comparator AR1 after aanalogvoltage, come the relatively sampled voltage of this aanalogvoltage and inverting input by this comparator AR1 again, after the duty ratio of this pwm signal is determined, feed back a control signal by optical coupler 142 to crossing current driver module 103 modules, control its output current, thereby adjusting sampled voltage, until the sampled voltage of comparator AR1 inverting input equals the aanalogvoltage that this pwm signal is converted to, realize the accurate control of LED light fixture input current, and then the brightness of accurate adjustment LED light fixture.
Above disclosed is only preferred embodiment of the present invention, certainly can not limit with this interest field of the present invention, one of ordinary skill in the art will appreciate that all or part of flow process that realizes above-described embodiment, and according to the equivalent variations that claim of the present invention is done, still belong to the scope that invention is contained.
Claims (9)
1. LED adjusting control circuit, comprise for external AC power supply being converted to the power conversion module of constant output current, and the control module (102) of exporting the pulse width modulating signal of corresponding duty ratio according to the brightness adjustment control instruction, it is characterized in that, also comprise dimming controlling module (104), described dimming controlling module (104) comprises the digital-to-analogue conversion submodule (141) that is converted to analog signal for the pulse width modulating signal with described control module (102) output, comparator (AR1), optical coupler (142), sampling resistor (Rs), the first end of described sampling resistor (Rs) is connected with the output of described power conversion module, the second end ground connection, the inverting input of described comparator (AR1) is connected in the node between the output of described sampling resistor (Rs) and described power conversion module, the in-phase input end of described comparator (AR1) connects the output of described control module (102) by described digital-to-analogue conversion submodule (141), the output of described comparator (AR1) is connected with the first input end of described optical coupler (142), the second input external power supply (VCC) of described optical coupler (142), the output of this optical coupler (142) is connected with the feedback end of described power conversion module.
2. LED adjusting control circuit as claimed in claim 1, it is characterized in that, described power conversion module comprises: the constant pressure source module (101) that is used for AC power is converted to DC power supply, and the constant-current driven module (103) that is used for providing to light fixture electric current, the output of described constant pressure source module (101) is connected with the input of described constant-current driven module (103); The feedback end of described constant-current driven module (103) is connected with the output of described optical coupler (142).
3. LED adjusting control circuit as claimed in claim 2, it is characterized in that, described digital-to-analogue conversion submodule (141) comprises inverter (U1), triode (Q1), the first to the 3rd divider resistance (R1, R2, R3), and electric capacity (C1), the base stage of described field effect transistor (Q1) connects the output of described control module (102) by described inverter (U1), the collector electrode of described field effect transistor (Q1) is by the first divider resistance (R1) external power supply (VCC), the grounded emitter of described field effect transistor (Q1), one end of the series circuit that is made of the series connection of described the second divider resistance (R2) and the 3rd divider resistance (R3) is connected in the collector electrode of described triode (Q1), other end ground connection, described electric capacity (C1) is in parallel with described the 3rd divider resistance (R3), the in-phase input end of described comparator (AR1) is connected in the node between described the second divider resistance (R2) and the 3rd divider resistance (R3).
4. LED adjusting control circuit as claimed in claim 3, it is characterized in that, also comprise the first to the 3rd current-limiting resistance (R4, R5, R6), the inverting input of described comparator (AR1) is connected in the node between the output of described sampling resistor (Rs) and described constant-current driven module (103) by described the first divider resistance (R4), the second input of described optical coupler (142) is by described the second divider resistance (R5) external power supply (VCC), the output of described optical coupler (142) is connected in the second input of described constant-current driven module (103) by described the 3rd current-limiting resistance (R6).
5. LED adjusting control circuit as described in any one in claim 2 to 4, is characterized in that, when the duty ratio of described pwm control signal was 100%, the output current of described constant-current driven module (103) was maximum.
6. LED adjusting control circuit as described in any one in claim 2 to 4, is characterized in that, when the duty ratio of described pwm control signal was 0%, the output current of described constant-current driven module (103) was minimum.
7. LED adjusting control circuit as described in any one in claim 2 to 4, is characterized in that, described constant pressure source module (101) comprises APFC.
8. LED adjusting control circuit as described in any one in claim 2 to 4, is characterized in that, described control module (102) is the single-chip microcomputer of Atmega88 for model.
9. LED light fixture with adjusting control circuit, it is characterized in that, comprise light-emitting diode (LED) module, and adjusting control circuit as described in any one in claim 1 to 8, described light-emitting diode (LED) module is connected with the power conversion module of described adjusting control circuit.
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| CN201110420256.4A CN103167676B (en) | 2011-12-15 | LED adjusting control circuit and there is the LED lamp of this adjusting control circuit |
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| CN201110420256.4A CN103167676B (en) | 2011-12-15 | LED adjusting control circuit and there is the LED lamp of this adjusting control circuit |
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| CN103167676B CN103167676B (en) | 2016-12-14 |
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| CN109638759A (en) * | 2018-12-24 | 2019-04-16 | 西电通用电气自动化有限公司 | It is a kind of to finely tune the control method and control circuit opened into threshold value based on PWM |
| CN109638759B (en) * | 2018-12-24 | 2020-04-21 | 西电通用电气自动化有限公司 | Control method and control circuit based on PWM fine tuning switching threshold |
| CN113301693A (en) * | 2021-05-25 | 2021-08-24 | 昂宝电子（上海）有限公司 | Multi-mode dimming circuit and method |
| CN113329544A (en) * | 2021-05-26 | 2021-08-31 | 欧普照明股份有限公司 | Lamp control circuit |
| CN113329544B (en) * | 2021-05-26 | 2024-04-26 | 欧普照明股份有限公司 | Lamp control circuit |
| CN116685014A (en) * | 2023-08-04 | 2023-09-01 | 无锡安特源科技股份有限公司 | Dimming control circuit and electronic equipment |
| CN116685014B (en) * | 2023-08-04 | 2023-10-20 | 无锡安特源科技股份有限公司 | Dimming control circuit and electronic equipment |
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