CN205005309U - LED sectional type switches on circuit in turn based on MCU - Google Patents

LED sectional type switches on circuit in turn based on MCU Download PDF

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Publication number
CN205005309U
CN205005309U CN201520689942.5U CN201520689942U CN205005309U CN 205005309 U CN205005309 U CN 205005309U CN 201520689942 U CN201520689942 U CN 201520689942U CN 205005309 U CN205005309 U CN 205005309U
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China
Prior art keywords
mcu
circuit
led
led string
electronic switch
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Expired - Fee Related
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CN201520689942.5U
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Chinese (zh)
Inventor
魏栓正
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Zhenjiang Suneng Photoelectric Technology Co Ltd
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Zhenjiang Suneng Photoelectric Technology Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

The utility model discloses a LED sectional type switches on circuit in turn based on MCU, this circuit passes through MCU control electronic switch, make each section LED lamp pearl one after the other switch on, realize that whole string of LED lamp pearl turn -on time is unanimous basically, turn -on time prevents that partial lamp pearl from producing the light decay phenomenon in advance because of being long, overcome in the present high -pressure drive scheme each section unequal problem of LED lamp pearl turn -on time, the circuit all comprises semiconductor device and resistance, its life and LED life -span phase -match, can reach more than 50, 000 hours, through test, efficiency reaches 97%, power factor can reach more than 99%.

Description

Based on the LED segmented alternate conduction circuit of MCU
Technical field
The utility model relates to circuit design field, particularly relates to MCU Based Intelligent Control, flash drive circuit and constant-current circuit, is specifically related to a kind of LED segmented alternate conduction circuit based on MCU.
Background technology
Because LED has one-way conduction, the oppositely resistance to feature forced down, need constant current to drive, therefore need to convert alternating current to direct current by AC/DC supply convertor to power, wherein adopt the driver of switch power technology to become main flow, but Switching Power Supply need to use the energy-storage travelling wave tubes such as jumbo electrochemical capacitor, transformer.Because of the limitation in LED lamp space and condition of high temperature when working, make the lost of life of electrochemical capacitor, become the short slab of lamp life.
Industry is in order to overcome this problem, and various high-voltage linear drive circuit arises at the historic moment, mainly contain at present unistage type and multisection type drive circuit point, unistage type, because of LED conducting threshold voltage, causes LED ON time short, light efficiency and power factor low; Multisection type is generally followed input voltage waveform by the control of electronic switch and is dropped into LED string respectively, improve power factor and light efficiency, but also there is a part of LED string ON time length and other lamp string ON time is short, cause the problem of the preferential light decay of LED string that ON time is long.
Utility model content
Goal of the invention: for the deficiencies in the prior art, the purpose of this utility model is to provide a kind of LED segmented alternate conduction circuit based on MCU, and circuit structure is simple, and it is convenient to control, and efficiency is high.
Technical scheme: in order to realize foregoing invention object, the technical solution adopted in the utility model is:
Based on a LED segmented alternate conduction circuit of MCU, comprise rectification circuit sinusoidal ac being converted to Rectified alternating current, the voltage detecting circuit detecting input voltage instantaneous value, provide the power supply circuits of power supply, the electronic switch by MCU control, the constant-current circuit keeping loop current basicly stable and multistage LED string for MCU; Described multistage LED string receives the output of rectification circuit after connecting with constant-current circuit, every section of LED string is all parallel with electronic switch, under the control of MCU, and access or open circuit at any time, the segmentation realizing LED string is lighted; Described testing circuit is connected to the output of rectification circuit, and the output of testing circuit receives the A/D conversion inputs of MCU, is detected the instantaneous value of input voltage by MCU, and to determine connection and the shutoff of electronic switch, what control LED string thus lights order; Described constant-current circuit coordinates MCU to realize by field effect transistor and sample resistance, and MCU gathers the feedback voltage on sample resistance and exports PMW signal according to magnitude of voltage, controls the time of field effect transistor conducting, realizes constant current object; Power supply circuits receive the output of rectification circuit, for MCU provides power supply.
Described MCU is detected zero point, and control electronic switch and make the turn-on sequence of LED string within adjacent two cycles contrary, the equilibrium realizing LED string is luminous.
Described electronic switch selects double pole triode, field effect triode or electronic relay.
Described multistage LED string is more than 3 sections LED strings, and each LED string is in series by being no less than 3 LED.
The driving method of the described LED segmented alternate conduction circuit based on MCU, comprising:
1) be energized after electricity, the K1 of MCU, K2 ... Kn and PWM port output low level, make electronic switch Q1, Q2 ... Qn is all in off state, and T1 also turns off, and on whole LED string, no current passes through, not luminous;
2) the A/D1 Port detecting input voltage of MCU, after voltage zero-crossing signal occurs, K1 port output low level makes electronic switch Q1 keep turning off, K2 to Kn port exports high level and makes electronic switch Q2 to Qn switch connection, along with the rising of input voltage instantaneous value, first paragraph LED crossfire overcurrent is luminous; When input voltage instantaneous value is elevated to V1, K2 port output low level makes electronic switch Q2 disconnect, first paragraph LED string and the luminescence of second segment LED string upper reaches overcurrent; When input voltage instantaneous value is elevated to V2, K3 port output low level makes electronic switch Q3 disconnect, and first paragraph LED string, second segment LED string and the 3rd section of LED string upper reaches overcurrent are luminous; The rest may be inferred, and when input voltage instantaneous value is elevated to Vn-1, Kn port output low level makes electronic switch Qn disconnect, and whole LED string upper reaches overcurrent is luminous; When input voltage instantaneous value drops to Vn-1 from maximum, Kn port exports high level makes electronic switch Qn close, and on n-th section of LED string, obstructed overcurrent is not luminous; When input voltage instantaneous value drops to Vn-2 from maximum, Kn-1 port exports high level makes electronic switch Qn-1 close, and on n-th section of LED string and (n-1)th section of LED string, obstructed overcurrent is not luminous; The rest may be inferred, and when input voltage instantaneous value drops to V1, K2 port exports high level makes electronic switch Q2 close, and only has first paragraph LED crossfire overcurrent luminous; Along with the reduction of input voltage instantaneous value, first paragraph LED string can be not luminous lower than conducting voltage threshold value because of both end voltage yet;
3) when second zero crossing being detected, K1 port exports high level makes electronic switch Q1 close, and Kn port output low level makes electronic switch Qn switch disconnect, and along with the rising of input voltage instantaneous value, n-th section of LED crossfire overcurrent is luminous; When input voltage instantaneous value reaches V1, Kn-1 port output low level makes electronic switch Qn-1 disconnect, n-th section of LED string and (n-1)th section of LED crossfire overcurrent luminescence; The like, when input voltage instantaneous value is elevated to Vn, K1 port output low level makes electronic switch Q1 disconnect, and first paragraph LED crossfire overcurrent is luminous; When input voltage instantaneous value from maximum drop to Vn time, when K1 port exports high level, electronic switch Q1 closes, and first paragraph LED string does not have electric current not luminous; When inputting instantaneous voltage and dropping to Vn-1, K2 port exports high level makes electronic switch Q2 close, first paragraph LED string and second segment LED string do not have electric current not luminous, the like, when input voltage instantaneous value drops to V1, during Kn-1 port output high level, electronic switch Qn-1 closes, and (n-1)th section of LED string does not have electric current not luminous; Along with the reduction of input voltage instantaneous value, n-th section of LED string is because both end voltage is not luminous lower than conduction threshold;
4) according to above step cycle, each section of LED string one after the other conducting is realized.
Beneficial effect: compared with prior art, advantage of the present utility model comprises:
1) circuit of the present utility model is all made up of semiconductor device and resistance, and its useful life and LED life-span match, and can reach more than 50,000 hours.
2) the utility model is under the control of MCU, achieve the one after the other conducting of LED string, make the fluorescent lifetime of every LED lamp pearl consistent, overcome the disadvantage that the inconsistent and part lamp pearl that is that cause of other drive part by part circuit each LED lamp bead ON time shifts to an earlier date light decay.
3) the utility model adopts microprocessor as control device, than the simple switching voltage adopting the mode of electric resistance partial pressure to control electronic switch more accurately.
4) the utility model have timing merit dimming function falls.
5) the utility model has communication interface, can with control system cascade, realize centralized control.
Accompanying drawing explanation
Fig. 1 is the structure chart of the LED segmented alternate conduction circuit based on MCU;
Fig. 2 is the driving procedure chart of LED segmented alternate conduction circuit;
Fig. 3 is the driving effect schematic diagram of LED segmented alternate conduction circuit;
Fig. 4 is typically based on the structure chart of the LED segmented alternate conduction circuit of MCU.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
Embodiment 1
As shown in Figure 1, based on the LED segmented alternate conduction circuit of MCU, comprise rectification circuit 1, power supply circuits 2, testing circuit 3, MCU4, constant-current circuit 5, n section LED string and a corresponding n electronic switch, n be not less than 2 integer, n section LED string comprise first paragraph LED string 6, second segment LED string 7 ..., n-th section of LED string 12; N electronic switch comprise electronic switch Q19, electronic switch Q210 ..., electronic switch Qn11.N section LED string receives the output of rectification circuit 1 after connecting with constant-current circuit 5, every section of LED string is all parallel with electronic switch, can under the control of MCU4, and access or open circuit at any time, the segmentation realizing LED string is lighted.Rectification circuit 1 adopts bridge rectifier, the circuit two ends that its output is connected to constant-current circuit 5, multistage LED string is formed.Testing circuit 3 is connected to the output of rectification circuit 1, and its output receives the A/D conversion inputs of MCU4, is detected the instantaneous value of input voltage by MCU4, and to determine connection and the shutoff of electronic switch, what control LED string thus lights order.Electronic switch can be double pole triode or field effect transistor, also can select any electronic switch that can control.Transistor base connects the corresponding output of MCU, and the collector and emitter of triode is connected respectively to the two ends of LED string.Constant-current circuit 5 coordinates MCU to realize by field effect transistor T1 and sample resistance R4, and MCU gathers the feedback voltage on R4 and exports PMW signal according to its value, the time of control T1 conducting, realizes constant current object.
Based on the driving method of the LED segmented alternate conduction circuit of MCU, can realize the one after the other conducting of multistage LED string, flow chart is shown in Fig. 2 and Fig. 3, and process is as follows:
1) after powering on, the K1 of MCU, K2 ... Kn and PWM port output low level, make electronic switch Q1, Q2 ... Qn is all in off state, and T1 also turns off, and on whole LED string, no current passes through, not luminous.
2) the A/D1 Port detecting input voltage of MCU, after voltage zero-crossing signal occurs, K1 port output low level makes Q1 switch 9 keep turning off, and K2 to Kn port exports high level and makes Q2 to Qn switch connection, along with the rising of input voltage instantaneous value, first paragraph LED string 6 flows through galvanoluminescence; When input voltage instantaneous value is elevated to V1, K2 port output low level makes Q2 switch 10 disconnect, first paragraph LED string 6 and the luminescence of second segment LED string 7 upper reaches overcurrent; When input voltage instantaneous value is elevated to V2, K3 port output low level makes Q3 switch disconnect, and first paragraph LED string 6, second segment LED string 7 and the 3rd section of LED string upper reaches overcurrent are luminous; The rest may be inferred, and when input voltage instantaneous value is elevated to Vn-1, Kn port output low level makes Qn switch 11 disconnect, and whole LED string upper reaches overcurrent is luminous.When input voltage instantaneous value drops to Vn-1 from maximum, Kn port exports high level makes Qn switch 11 close, and on n-th section of LED string, obstructed overcurrent is not luminous; When input voltage instantaneous value drops to Vn-2 from maximum, Kn-1 port exports high level makes Qn-1 switch close, and on n-th section of LED string and (n-1)th section of LED string, obstructed overcurrent is not luminous; The rest may be inferred, and when input voltage instantaneous value drops to V1, K2 port exports high level makes Q2 switch close, and only has first paragraph LED crossfire overcurrent luminous; Along with the reduction of input voltage instantaneous value, first paragraph LED string can be not luminous lower than conducting voltage threshold value because of both end voltage yet.
3) when second zero crossing being detected, K1 port exports high level makes Q1 switch close, and Kn port output low level makes Qn switch 11 disconnect, and along with the rising of input voltage instantaneous value, n-th section of LED crossfire overcurrent is luminous; When input voltage instantaneous value reaches V1, Kn-1 port output low level makes Qn-1 switch disconnect, n-th section of LED string and (n-1)th section of LED crossfire overcurrent luminescence; The like, when input voltage instantaneous value is elevated to Vn, K1 port output low level makes Q1 switch disconnect, and first paragraph LED crossfire overcurrent is luminous.When input voltage instantaneous value from maximum drop to Vn time, when K1 port exports high level, Q1 switch closes, and first paragraph LED string does not have electric current not luminous; When inputting instantaneous voltage and dropping to Vn-1, K2 port exports high level makes Q2 switch close, first paragraph LED string and second segment LED string do not have electric current not luminous, the like, when input voltage instantaneous value drops to V1, during Kn-1 port output high level, Qn-1 switch closes, and (n-1)th section of LED string does not have electric current not luminous; Along with the reduction of input voltage instantaneous value, n-th section of LED string is because both end voltage is not luminous lower than conduction threshold.
4) each section of LED string one after the other conducting can and so forth, be realized.
5) A/D2 Port detecting feedback voltage size and in PWM port output signal, regulate T1 control loop electric current to make its substantially constant.
6) after powering on, MCU timer internal is started working, and when reaching the duration of program setting, changes the duty ratio of pwm signal, thus realizes falling merit dimming function.
7) utilize MCU internal standard serial communication interface, communicate with host computer, the centralized control of light fixture can be realized.
Embodiment 2
Figure 4 shows that a preferred version of the present utility model, in this preferred version, LED string is in series by 90 lamp pearls, whole piece LED string is divided into three sections, be respectively first paragraph LED string 6, second segment LED string 7 and the 3rd section of LED string 8, every section of 30 lamp pearls; Electronic switch is served as by double pole triode Q1, Q2, Q3, output port K1, K2 and K3 that transistor base is connected to MCU4 control by it, Q1 electronic switch 9 is attempted by the two ends of first paragraph LED string 6, Q2 electronic switch 10 is attempted by second segment LED string 7 two ends, Q3 electronic switch 11 is connected in parallel on the 3rd section of LED string 8 two ends, and electronic switch and three sections of LED strings are connected with constant-current circuit 5.
The 50Hz sine wave alternating current of input is the all-wave of 100Hz by the voltage waveform after rectification circuit 1 rectification.Rectification circuit two output is added in the circuit two ends that LED string and constant-current circuit are in series, and the operating current of constant-current circuit is less than or equal to the maximum operating currenbt of LED.Power supply circuits provide power supply for MCU4, and the voltage sample circuit that MCU4 is consisted of resistance R2 and resistance R3 detects input voltage, and setting voltage test point is V1, V2, V3.When input voltage rises between 0 to V1 voltage range, the output K1 output low level of MCU4, Q1 electronic switch 9 disconnects, and the conducting of first paragraph LED string 6 is luminous; When input voltage rises between V1 to V2 scope, MCU4 output K2 output low level, Q2 electronic switch 10 turns off, first paragraph LED string 6 and second segment LED string 7 conducting luminescence; When input voltage rises between V2 to V3 scope, MCU4 output K3 output low level, Q3 electric switch 11 turns off, and all LED string conductings are luminous; When input voltage drops to V2, MCU output K3 exports high level, Q3 electronic switch 11 conducting, and the 3rd section of LED string 8 no current is not luminous; When input voltage is lower than V1, MCU output K2 exports high level, Q2 electronic switch 10 conducting, and second segment LED string 7 no current is not luminous; Along with the reduction of input voltage instantaneous value, first paragraph LED string 6 also quits work because both end voltage does not reach conduction threshold, and when input voltage instantaneous value equals zero, the output K1 of MCU4 exports high level, Q1 electronic switch 9 conducting.
Next cycle comes interim, when input voltage rises between 0 to V1 voltage range, and the output K3 output low level of MCU4, Q3 electronic switch 11 disconnects, and the 3rd section of LED string 8 conducting is luminous; When input voltage rises between V1 to V2 scope, MCU4 output K2 output low level, Q2 electronic switch 10 turns off, second segment LED string 7 and the 3rd section of LED string 8 conducting luminescence; When input voltage rises between V2 to V3 scope, MCU4 output K1 output low level, Q1 electric switch 9 turns off, and all LED string conductings are luminous; When input voltage drops to V2, MCU output K1 exports high level, Q1 electronic switch 9 conducting, and first paragraph LED string 6 no current is not luminous; When input voltage is lower than V1, MCU output K2 exports high level, Q2 electronic switch 10 conducting, and second segment LED string 7 no current is not luminous; Along with the reduction of input voltage instantaneous value, the 3rd section of LED string also quits work because both end voltage does not reach conduction threshold.
And so forth, first paragraph and the 3rd section of LED string one after the other conducting, namely in each cycle, the ON time of every section of LED string is 2/3T, reaches the object that each section of lamp string fluorescent lifetime is substantially identical.
The size of A/D2 Port detecting feedback voltage also in PWM port output signal, regulates T1 control loop electric current to make its substantially constant.
After powering on, MCU timer internal is started working, and when reaching the duration of program setting, changes the duty ratio of pwm signal, thus realizes falling merit dimming function.
Utilize MCU internal standard serial communication interface, communicate with host computer, the centralized control of light fixture can be realized.
The utility model can also increase the hop count of LED string and the number of electronic switch as required, and is not limited only to this preferred version.
In addition, as another preferred version of the utility model, electronic switch can adopt field effect transistor to replace double pole triode.
MCU8 model of the present utility model can be selected flexibly according to actual conditions.
As a kind of preferred version, rectification circuit of the present utility model can adopt rectifier bridge, and voltage-stabiliser tube D2 can adopt the voltage stabilizing didoe of 5V, and the resistance of resistance R2, resistance R3 is 820K; The resistance of resistance R1 is 82K.The resistance of resistance R4 is determined according to power demand, and Correctional tube T1 can select field effect transistor.
Therefore, use the power supply circuits of the present embodiment, along with the rising of voltage, the segmentation of LED string is lighted, and because frequency is at more than 100Hz, human eye perceives is less than flicker, such circuit just can make full use of alternating current in the mode of piecewise differential, after tested, efficiency reaches 97%, and power factor can reach more than 99%.
Above-described embodiment does not limit the utility model in any form, the technical scheme that the mode that all employings are equal to replacement or equivalent transformation obtains, and all drops in protection range of the present utility model.

Claims (4)

1. the LED segmented alternate conduction circuit based on MCU, it is characterized in that, comprise rectification circuit sinusoidal ac being converted to Rectified alternating current, the voltage detecting circuit detecting input voltage instantaneous value, provide the power supply circuits of power supply, the electronic switch by MCU control, the constant-current circuit keeping loop current basicly stable and multistage LED string for MCU; Described multistage LED string receives the output of rectification circuit after connecting with constant-current circuit, every section of LED string is all parallel with electronic switch, under the control of MCU, and access or open circuit at any time, the segmentation realizing LED string is lighted; Described testing circuit is connected to the output of rectification circuit, and the output of testing circuit receives the A/D conversion inputs of MCU, is detected the instantaneous value of input voltage by MCU, and to determine connection and the shutoff of electronic switch, what control LED string thus lights order; Described constant-current circuit coordinates MCU to realize by field effect transistor and sample resistance, and MCU gathers the feedback voltage on sample resistance and exports PMW signal according to magnitude of voltage, controls the time of field effect transistor conducting, realizes constant current object; Power supply circuits receive the output of rectification circuit, for MCU provides power supply.
2. the LED segmented alternate conduction circuit based on MCU according to claim 1, it is characterized in that, described MCU is detected zero point, and control electronic switch and make the turn-on sequence of LED string within adjacent two cycles contrary, the equilibrium realizing LED string is luminous.
3. the LED segmented alternate conduction circuit based on MCU according to claim 1, it is characterized in that, described electronic switch selects double pole triode, field effect triode or electronic relay.
4. the LED segmented alternate conduction circuit based on MCU according to claim 1, it is characterized in that, described multistage LED string is more than 3 sections LED strings, and each LED string is in series by being no less than 3 LED.
CN201520689942.5U 2015-09-08 2015-09-08 LED sectional type switches on circuit in turn based on MCU Expired - Fee Related CN205005309U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105142282A (en) * 2015-09-08 2015-12-09 镇江苏能光电有限公司 MCU-based LED sectional type alternative conduction circuit and driving method thereof
CN107949105A (en) * 2017-11-21 2018-04-20 深圳市明微电子股份有限公司 Constant current driver circuit for LED and lamps and lanterns

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105142282A (en) * 2015-09-08 2015-12-09 镇江苏能光电有限公司 MCU-based LED sectional type alternative conduction circuit and driving method thereof
CN105142282B (en) * 2015-09-08 2018-07-10 镇江苏能光电有限公司 LED segmented alternate conduction circuits and its driving method based on MCU
CN107949105A (en) * 2017-11-21 2018-04-20 深圳市明微电子股份有限公司 Constant current driver circuit for LED and lamps and lanterns

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Granted publication date: 20160127

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