CN203645882U - LED driving circuit for changing luminescent colors with cooperation of power switch - Google Patents

LED driving circuit for changing luminescent colors with cooperation of power switch Download PDF

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Publication number
CN203645882U
CN203645882U CN201320834135.9U CN201320834135U CN203645882U CN 203645882 U CN203645882 U CN 203645882U CN 201320834135 U CN201320834135 U CN 201320834135U CN 203645882 U CN203645882 U CN 203645882U
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China
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unit
color
drive circuit
control unit
led drive
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CN201320834135.9U
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Chinese (zh)
Inventor
万叶华
金昌洲
凌厉锋
叶松安
沈锦祥
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Sengled Optoelectronics Co Ltd
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Sengled Optoelectronics Co Ltd
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Abstract

The utility model discloses an LED driving circuit for changing luminescent colors with cooperation of a power switch. The LED driving circuit mainly comprises a switch state detection unit connected with a transformer unit, a color control unit receiving a switch monitoring signal indicating actions of a power switch and outputting a feedback signal according to the switch monitoring signal, a switch tube used for controlling on and off of the primary of the transformer unit, used for receiving the feedback signal from the color control unit, controlling the switch tube according to the feedback signal and further controlling the voltage outputted to the secondary of the transformer unit, and a voltage detection unit used for detecting the supply voltage of the color control unit. Color change of an LED lighting device can be achieved through combination of actions of a normal power switch on a wall and the above LED driving circuit directly. The cost is low and the usage is convenient.

Description

A kind of LED drive circuit that coordinates mains switch to change glow color
Technical field
The utility model relates to LED lighting technical field, particularly a kind of LED drive circuit that coordinates mains switch to change glow color.
Background technology
LED due to have energy-saving and environmental protection, can be light-operated, the lot of advantages such as solidification, long-life, be widely used in various lighting fields in the today of advocating low-carbon (LC) life.
In the prior art, the holder structure of LED lamp is generally designed to the holder structure identical with original illuminating lamp such as incandescent lamp, electricity-saving lamp, LED lamp directly can be replaced to original illuminating lamp like this, is not only convenient to install, and does not change the structure of original illuminator.
But LED lamp is directly replaced after original illuminating lamp, the dimming function of the LED lamp after replacement cannot be brought into play, if LED lamp is carried out to light modulation, must in original illuminator, access in addition dimmer, so just increase the use cost of LED lamp, and in the time of mounted LED lamp, also need professional installation personnel that dimmer is installed, install complicated.And, directly replace after original illuminating lamp with LED lamp, cannot utilize existing standard machinery switch to carry out variable color control to LED lamp.
Utility model content
The utility model has overcome above-mentioned the deficiencies in the prior art, provides a kind of without changing current wiring, do not need additional any peripheral dimmer switch or equipment, directly can realizing by common power switch motion the LED drive circuit that light color converts.
The technical solution of the utility model is achieved in that
A kind of LED drive circuit that coordinates mains switch to change glow color, for driving the LED lighting device that includes three kinds of color LED lamp pearls of RGB, and described LED drive circuit connects AC power and mains switch, LED drive circuit comprises filter unit and rectification unit, described LED drive circuit receives AC power input, after unit and rectification unit, obtain direct voltage after filtering, it is characterized in that: described LED drive circuit also comprises:
Transformer unit, is connected with rectification unit, and transformer unit comprises elementary and secondary;
On off state detecting unit, connection transformer unit, for detection of the operate condition of mains switch;
Color control unit, is connected with the secondary of described transformer unit and on off state detecting unit, and described color control unit receives the switch monitor signal of the action of instruction mains switch, and exports a feedback signal according to described switch monitor signal; And:
Switching tube, is connected with the elementary of flyback converting unit and transformer unit respectively, for the elementary break-make of control transformer unit;
Flyback converting unit, is connected with the elementary of transformer unit, for receiving the feedback signal from described color control unit, and according to described feedback signal control switch pipe, outputs to the secondary voltage height of transformer unit thereby control;
Voltage detection unit, is connected with color control unit, and for detection of the supply power voltage of color control unit, when described supply power voltage is during lower than minium operation voltage value, this voltage detection unit will stop the work of color control unit, and LED lighting device cuts out simultaneously.
As preferably, described switching tube is field effect transistor, and it comprises grid, drain electrode and source electrode, and described grid is connected with described flyback converting unit, and described drain electrode is connected with the elementary of described transformer unit.
As preferably, described LED drive circuit also comprises constant current unit, and this constant current unit is connected between described color control unit and LED lighting device.The lamp pearl of LED lighting device always has three tunnels, be respectively red, blue and green, the electric current of this three street lamps pearl is by constant current unit controls, constant current unit receives the pwm signal of color control unit output and regulates by the high accuracy that the variation of its duty ratio realizes RGB three paths of LEDs lamp pearl electric currents, and in the time of the curent changes of three street lamp pearls, the brightness of three kinds of colors will be different, the color relation blending can be different, thereby realize the effect that multiple color shows.
As preferably, described constant current unit comprises the first field effect transistor, the second field effect transistor and the resistance being connected with the first field effect transistor and the second field effect transistor; Described the first field effect transistor and the second field effect transistor are N-type field effect transistor, include grid, drain electrode and source electrode; The grid of described the first field effect transistor is connected with the source electrode of the second field effect transistor, the drain electrode of the first field effect transistor is connected with the grid of the second field effect transistor, and the grid of the second field effect transistor is connected color control unit and receives the pwm signal from color control unit with the drain electrode of the first field effect transistor.
As preferably, described on off state detecting unit is connected between the elementary of transformer unit and color control unit.The detection position point of on off state detecting unit is high-pressure side detection.
As preferably, described on off state detecting unit is connected between the secondary of transformer unit and color control unit.The detection position point of on off state detecting unit is low-pressure end detection.
As preferably, described LED drive circuit also comprises the light-coupled isolation unit in order to electrical isolation, this light-coupled isolation unit is connected between described flyback control unit and color control unit, described flyback control unit receives described feedback signal from described light-coupled isolation unit, and according to the output voltage of this feedback signal control transformer unit.
As preferably, the primary and secondary of described transformer unit is isolation.Isolation refers to that AC mains electricity input end and final output are to meet safety requirement, and secondary is safety low-pressure, directly touches the secondary danger that can not produce electric shock.
As preferably, the primary and secondary of described transformer unit is non-isolation.Non-isolation is AC mains electricity input end and secondary electrical connection, directly touches the secondary danger that can produce electric shock, need separately add protection.
Compared to prior art, the utility model is without changing current wiring, not needing additional any peripheral dimmer switch or equipment, directly can realize the conversion of LED lighting device color by common power switch motion on wall, LED lighting device can directly be replaced traditional lighting light source, cost is low, easy to use.
Brief description of the drawings
Fig. 1 is the structured flowchart of the utility model LED drive circuit the first embodiment;
Fig. 2 is the structured flowchart of the utility model LED drive circuit the second embodiment;
Fig. 3 is the structured flowchart of the utility model LED drive circuit the 3rd embodiment;
Fig. 4 is the structured flowchart of the utility model LED drive circuit the 4th embodiment;
Fig. 5 is the structured flowchart of the utility model LED drive circuit the 5th embodiment;
Fig. 6 is the structured flowchart of the utility model LED drive circuit the 6th embodiment;
Fig. 7 is the utility model LED drive circuit working state figure;
Fig. 8 is the schematic flow sheet of the utility model LED drive circuit method of work.
Embodiment
Embodiment of the present utility model is as follows:
Fig. 1 is the structured flowchart of the utility model LED drive circuit the first embodiment, as shown in Figure 1, the utility model LED drive circuit is for driving LED lighting device, described LED lighting device comprises the LED lamp pearl of three kinds of colors of RGB, the actual illuminating device luminous color of LED of seeing has by these three primary colors mixes and produces, and this LED drive circuit is connected with AC power 1 and common power switch 2, mains switch 2 refers to the switch of ON/OFF conventional in life, wherein, AC power 1 and mains switch 2 are existing structures in the market, LED drive circuit of the present utility model comprises filter unit 3, rectification unit 4, transformer unit 5, on off state detecting unit 6, flyback control unit 7, color control unit 8, constant current unit 9, switching tube 10 and voltage detection unit 13.
Described transformer unit 5 comprise with rectification unit 4 be connected elementary and that be connected with LED lighting device secondary.Described flyback control unit 7 is connected between the elementary of transformer unit and color control unit 8.Described on off state detecting unit 6 is connected between the secondary of transformer unit 5 and color control unit 8, for the switch monitor signal of the action of instruction mains switch 2 is inputed to color control unit 8, color control unit 8 according to switch monitor signal output one flow through LED lighting device electric current feed back signal to flyback control unit 7, flyback control unit 7 is according to this feedback signal control switch pipe 10, thereby control outputs to the voltage height of 5 levels of transformer unit.Voltage detection unit 13, be connected with color control unit 8, for detection of the supply power voltage of color control unit 8, when described supply power voltage is during lower than minium operation voltage value, this voltage detection unit 13 will stop color control unit 8 works, and LED lighting device cuts out simultaneously.
Concrete driving process is as follows: first LED drive circuit unit 3 carries out input ac voltage signal to be rectified into direct current signal through rectification unit 4 again after filtering after filtering, and transformer unit 5 converts this direct current signal the needed applicable voltage of output to and provides power supply to flyback control unit 7 and color control unit 8.Flyback control unit 7 is by the stablizing with arrival output voltage to the control of switching tube 10.
In the present embodiment, described switching tube 10 is field effect transistor, comprises grid, drain electrode and source electrode, and the grid of switching tube 10 is connected with described flyback converting unit 7, and the drain electrode of switching tube 10 is connected with transformer unit 5 is elementary; The secondary LED lighting device that is connected with of transformer unit 5, switching tube 10 is field effect transistor, and it is a kind of operating state of high frequency, and frequency is at tens KHz, carry out control switch pipe 10 by flyback control unit 7 and open and turn-off, controlling energy, to be passed to transformer secondary be output.Flyback control unit 7 to the control command of switching tube 10 is in conjunction with producing from the elementary voltage recording of transformer unit 5 and electric current (flow through and be connected to the voltage that the ohmically electric current of the field effect transistor source electrode produces) institute of flowing through switching tube 10.
In the present embodiment, LED lighting device comprises RGB three paths of LEDs lamp pearls.In addition, the secondary electric capacity 11 that is also connected in parallel of transformer unit 5.Because the capacitance of electric capacity 11 is larger, stopping as after its charging, its electric energy discharges slower, thus can be in the time that power supply be cut off, can continue as color control unit 8 and power.
After powering on for the first time, color control unit 8 resets and lights LED lighting device according to the color of storing in flash memory (color of preserving when the last time turns off the light), the color of LED lighting device inputs respectively different electric currents to RGB three paths of LEDs lamp pearls by constant current unit 9, realize the conversion RGB ratio of brightness separately, thereby reach the variation of color.
In the time that mains switch 2 moves, on off state detecting unit 6 can detect corresponding action and pass to color control unit 8, and color control unit 8 is exported corresponding pwm signal according to current operating state (constant color state or circulation variable color state).If carry out continuous switch motion fast, system can be recovered preset value (fix certain color and operating state and revert to constant color state).Color control unit 8 concrete by output three road pwm signals to constant current unit 9,9 of the constant current unit change in duty cycle by three road PWM realizes the high accuracy control of RGB three paths of LEDs lamp pearl electric currents, thereby realizes the demonstration of multiple color.Described constant current unit 9 comprises the first field effect transistor, the second field effect transistor and the resistance being connected with the first field effect transistor and the second field effect transistor; Described the first field effect transistor and the second field effect transistor are N-type field effect transistor, include grid, drain electrode and source electrode; The grid of described the first field effect transistor is connected with the source electrode of the second field effect transistor, the drain electrode of the first field effect transistor is connected with the grid of the second field effect transistor, and the grid of the second field effect transistor is connected color control unit 8 and receives the pwm signal from color control unit 8 with the drain electrode of the first field effect transistor.
In the time that mains switch 2 is closed, because input power is cut off, LED drive circuit cannot be worked, LED lighting device will cut out, but now electric capacity 11 will continue as color control unit 8 and power, so now color control unit 8 will work on, until the voltage of this electric capacity 11 is lower than a certain limit value time, color control unit 8 just can reset.During color control unit 8 continuous firings, after mains switch 2 is opened again, 6 of on off state detecting units can be passed to this signal color control unit 8, color control unit 8 is judged and switch current operating state by changing the pwm signal of its output.
Figure 2 shows that the structured flowchart of the utility model LED drive circuit the second embodiment, LED drive circuit shown in Fig. 2 and Fig. 1 are similar, difference is only: the LED drive circuit shown in the second embodiment also comprises a light-coupled isolation unit 12, this light-coupled isolation unit 12 is connected between described flyback control unit 7 and color control unit 8, described flyback control unit 7 receives the feedback signal of the electric current of indicating the LED lighting device of flowing through from described light-coupled isolation unit 12, and according to the output voltage of this feedback signal control transformer unit 5.
Figure 3 shows that the structured flowchart of the utility model LED drive circuit the 3rd embodiment, the LED drive circuit shown in Fig. 3 and Fig. 1 are similar, and difference is only: the LED drive circuit shown in the 3rd embodiment is by non-the primary and secondary of described transformer unit 5 isolation.
Figure 4 shows that the structured flowchart of the utility model LED drive circuit the 4th embodiment, LED drive circuit shown in Fig. 4 and Fig. 3 are similar, difference is only: the LED drive circuit shown in the 4th embodiment also comprises a light-coupled isolation unit 12, this light-coupled isolation unit 12 is connected between described flyback control unit 7 and digital control unit 8, described flyback control unit 7 receives the feedback signal of the electric current of indicating the LED lighting device of flowing through from described light-coupled isolation unit 12, and according to the output voltage of this feedback signal control transformer unit 5.
Figure 5 shows that the structured flowchart of the utility model LED drive circuit the 5th embodiment, LED drive circuit shown in Fig. 5 and Fig. 1 are similar, difference is only: in the 5th embodiment, described on off state detecting unit 6 is connected between the elementary of transformer unit 5 and color control unit 8.
Figure 6 shows that the structured flowchart of the utility model LED drive circuit the 6th embodiment, LED drive circuit shown in Fig. 6 and Fig. 5 are similar, difference is only: the LED drive circuit shown in the 6th embodiment also comprises a light-coupled isolation unit 12, this light-coupled isolation unit 12 is connected between described flyback control unit 7 and color control unit 8, described flyback control unit 7 receives the feedback signal of the electric current of indicating the LED lighting device of flowing through from light-coupled isolation unit 12, and according to the output voltage of this feedback signal control transformer unit 5.
Fig. 7 is the utility model LED drive circuit working state figure, as shown in Figure 7, concrete switch motion toning process is as follows: power on for the first time (the last power-off of distance exceedes more than 2 seconds), LED drive circuit operating state is constant color state, and under this state, LED lighting device is constant color.When mains switch 2 power cutoffs and in 2 seconds opening power again, now drive circuit works state will become as circulation variable color state, start varying cyclically color gradually by the color of fixing last time, thereby color control unit 8 reaches the conversion of color by not stopping to change red-green-blue ratio separately.Under this state, when mains switch 2 power cutoffs and in 2 seconds again when opening power, color will immobilize, shown color for before turn off the light when dynamic change before flashy color.
Fig. 8 is the schematic flow sheet of the utility model LED drive circuit method of work, and as shown in Figure 8, the process step that the utility model changes LED lighting device color by mains switch in conjunction with above-mentioned drive circuit is as follows:
Step 810: system initialization:
(1), system mode is constant color state;
(2), high-speed switch counting zero clearing continuously;
(3), read the color of preserving before power-off;
Step 811: the state that detects mains switch;
Step 812: if mains switch attonity continues to detect the state of mains switch;
Step 813: if detect that mains switch closes, color control unit can judge that whether its supply power voltage is lower than minium operation voltage value according to the signal of voltage detection unit;
Step 814:; If voltage detection module detects the supply power voltage of color control unit and, lower than the lower limit of color control unit operating voltage, LED lighting device cuts out; If, lower than the lower limit of color control unit operating voltage, do not return to step 811, continue sense switch state;
Step 815: if mains switch is opened, color control unit judges whether continuous high-speed switch number of times has exceeded the assigned switch number of times completing within the time of setting.Within the time of setting, the assigned switch number of times that completes can be changed according to actual product demand in program, and such as being defined in, in 2 seconds, to carry out 2 switch motions be critical point.Under mains switch open mode, close and open again No. 1 switch of meter work.
Step 816: if high-speed switch number of times has exceeded the assigned switch number of times completing within the time of setting continuously, all parameters of system are recovered preset value, and color is certain default constant color, and operating state is constant color state.Such as carried out being more than or equal to the continuous switch motion of 3 times in 2 seconds, carry out more fast switch, all parameters of system are recovered preset value, and color is certain default constant color, and operating state is constant color state;
Step 817: if high-speed switch number of times does not exceed the assigned switch number of times completing within the time of setting continuously, the operating state of circuit before judgement; Such as continuous on-off times in 2 seconds only has 1 time, switch motion is slower; The operating state of circuit before judgement;
Step 818: if the operating state of circuit is constant color state before, change current state, start by current color the variable color that circulates, then return to the state of step 811 continuation detection mains switch; In the time again carrying out switch motion, stop and being fixed as a kind of color;
Step 819: if the operating state of circuit is circulation variable color state before, change current state, show the color of preserving, then return to the state of step 811 continuation detection mains switch.
The utility model preferred embodiment is just for helping to set forth the utility model.Preferred embodiment does not have all details of detailed descriptionthe, and also not limiting this utility model is only described embodiment.Obviously,, according to the content of this specification, can make many modifications and variations.These embodiment are chosen and specifically described to this specification, is in order to explain better principle of the present utility model and practical application, thereby under making, technical field technical staff can utilize the utility model well.The utility model is only subject to the restriction of claims and four corner and equivalent.Disclosed is above only several specific embodiments of the application, but the application is not limited thereto, and the changes that any person skilled in the art can think of, all should drop in the application's protection range.

Claims (9)

1. a LED drive circuit that coordinates mains switch to change glow color, for driving the LED lighting device that includes three kinds of color LED lamp pearls of RGB, and described LED drive circuit connects AC power and mains switch, LED drive circuit comprises filter unit and rectification unit, described LED drive circuit receives AC power input, after unit and rectification unit, obtain direct voltage after filtering, it is characterized in that: described LED drive circuit also comprises:
Transformer unit, is connected with rectification unit, and transformer unit comprises elementary and secondary;
On off state detecting unit, connection transformer unit, for detection of the operate condition of mains switch;
Color control unit, is connected with the secondary of described transformer unit and on off state detecting unit, and described color control unit receives the switch monitor signal of the action of instruction mains switch, and exports a feedback signal according to described switch monitor signal; And:
Switching tube, is connected with the elementary of flyback converting unit and transformer unit respectively, for the elementary break-make of control transformer unit;
Flyback converting unit, is connected with the elementary of transformer unit, for receiving the feedback signal from described color control unit, and according to described feedback signal control switch pipe, outputs to the secondary voltage height of transformer unit thereby control;
Voltage detection unit, is connected with color control unit, and for detection of the supply power voltage of color control unit, when described supply power voltage is during lower than minium operation voltage value, this voltage detection unit will stop the work of color control unit, and LED lighting device cuts out simultaneously.
2. a kind of LED drive circuit that coordinates mains switch to change glow color according to claim 1, it is characterized in that: described switching tube is field effect transistor, it comprises grid, drain electrode and source electrode, described grid is connected with described flyback converting unit, and described drain electrode is connected with the elementary of described transformer unit.
3. a kind of LED drive circuit that coordinates mains switch to change glow color according to claim 1, is characterized in that: described LED drive circuit also comprises constant current unit, and this constant current unit is connected between described color control unit and LED lighting device.
4. a kind of LED drive circuit that coordinates mains switch to change glow color according to claim 3, is characterized in that: described constant current unit comprises the first field effect transistor, the second field effect transistor and the resistance being connected with the first field effect transistor and the second field effect transistor; Described the first field effect transistor and the second field effect transistor are N-type field effect transistor, include grid, drain electrode and source electrode; The grid of described the first field effect transistor is connected with the source electrode of the second field effect transistor, the drain electrode of the first field effect transistor is connected with the grid of the second field effect transistor, and the grid of the second field effect transistor is connected color control unit and receives the pwm signal from color control unit with the drain electrode of the first field effect transistor.
5. a kind of LED drive circuit that coordinates mains switch to change glow color according to claim 1, is characterized in that: described on off state detecting unit is connected between the elementary of transformer unit and color control unit.
6. a kind of LED drive circuit that coordinates mains switch to change glow color according to claim 1, is characterized in that: described on off state detecting unit is connected between the secondary of transformer unit and color control unit.
7. a kind of LED drive circuit that coordinates mains switch to change glow color according to claim 1, it is characterized in that: described LED drive circuit also comprises the light-coupled isolation unit in order to electrical isolation, this light-coupled isolation unit is connected between described flyback control unit and color control unit, described flyback control unit receives described feedback signal from described light-coupled isolation unit, and according to the output voltage of this feedback signal control transformer unit.
8. a kind of LED drive circuit that coordinates mains switch to change glow color according to claim 1, is characterized in that: the primary and secondary of described transformer unit is isolation.
9. a kind of LED drive circuit that coordinates mains switch to change glow color according to claim 1, is characterized in that: the primary and secondary of described transformer unit is non-isolation.
CN201320834135.9U 2013-12-16 2013-12-16 LED driving circuit for changing luminescent colors with cooperation of power switch Active CN203645882U (en)

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Application Number Priority Date Filing Date Title
CN201320834135.9U CN203645882U (en) 2013-12-16 2013-12-16 LED driving circuit for changing luminescent colors with cooperation of power switch

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106211498A (en) * 2014-09-29 2016-12-07 张胡玉婕 A kind of photochromic control method of illuminator
CN106898209A (en) * 2015-12-21 2017-06-27 重庆尊来科技有限责任公司 Count light emitting-type science popularization device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106211498A (en) * 2014-09-29 2016-12-07 张胡玉婕 A kind of photochromic control method of illuminator
TWI577234B (en) * 2014-09-29 2017-04-01 Hu Yu Jie Chang An adjustable lighting fixture
CN106211498B (en) * 2014-09-29 2018-12-11 张胡玉婕 A kind of photochromic control method of lighting device
CN106898209A (en) * 2015-12-21 2017-06-27 重庆尊来科技有限责任公司 Count light emitting-type science popularization device

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