CN104661408A - LED dimming circuit and LED lamp - Google Patents
LED dimming circuit and LED lamp Download PDFInfo
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- CN104661408A CN104661408A CN201510070717.8A CN201510070717A CN104661408A CN 104661408 A CN104661408 A CN 104661408A CN 201510070717 A CN201510070717 A CN 201510070717A CN 104661408 A CN104661408 A CN 104661408A
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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 LED lamp. The LED lamp comprises an LED dimming circuit connected with a diming switch, wherein the LED dimming circuit comprises a rectifying and filtering unit, a switch device, a switch control chip, an output unit, a sampling resistor and a power regulating unit; the power regulating unit is used for collecting waveform of output voltage of the output end of the diming switch; when the waveform is a normal sine wave, the output power of the output unit is regulated according to switching on and off frequency of the output voltage with accordance with the condition; when the waveform is a chopped sine wave, the output power of the output unit is regulated to be maximum. The LED dimming circuit is used for detecting the current waveform which passes through regulation switches and judging the type of the regulation switches according to the characteristics of different influences of ordinary switches and silicon-controlled regulation switches on the current, thereby controlling output power of the circuit by using different control strategies and implementing compatibility of stepless dimming and segmental dimming.
Description
Technical field
The present invention relates to LED illumination technology, particularly relate to a kind of LED light adjusting circuit and LED lamp.
Background technology
Existing segmented light modulation is use common wall type switch by different on-off times, to produce corresponding power output and brightness.Circuit realiration uses to have the functional circuit that number of times opened by identification switch, makes circuit produce corresponding power output and make LED send different brightness.But its weakness is light modulation is segmentation, usually only has 2 ~ 4 sections, can not stepless adjustment brightness linearly.Advantage uses to install simply.
Existing controllable silicon light modulation needs to use special controllable silicon dimmer, and the special power supply with controllable silicon light modulation function or light source could be with the use of.Its advantage is for can realize stepless dimming, but it can not general with sectional dimming.
Summary of the invention
The object of the invention be to provide a kind of can the LED light adjusting circuit of compatible stepless dimming and sectional dimming.
The invention provides a kind of LED light adjusting circuit, be connected with dimmer switch, comprise rectification filtering unit, switching device, switch control chip, output unit, sampling resistor and power adjustment unit, wherein:
The input of described rectification filtering unit connects AC power by described dimmer switch, export the positive input terminal of output unit described in termination, the negative input end of output unit described in the input termination of described switching device, the output of described switching device is by sampling resistor ground connection, the pwm signal that described switch control chip is exported by its output, to the control end of described switching device, controls the break-make of described switching device to control the output of described output unit; The output of dimmer switch described in one termination of described power adjustment unit, the pwm signal input port of switch control chip described in another termination;
Described power adjustment unit gathers the waveform of the output voltage of the output of described dimmer switch, when described waveform is normal sine wave, described power adjustment unit regulates the duty ratio of the pwm signal exported according to the qualified break-make number of times of described output voltage, the duty ratio of the pwm signal that described switch control chip self exports according to the duty cycle adjustment of received pwm signal, to regulate the power output of described output unit; When described waveform is sinusoidal wave by copped wave, then described power adjustment unit regulates the duty ratio of the pwm signal exported to be fixed value, the duty ratio of the pwm signal that described switch control chip self exports according to the duty cycle adjustment of the pwm signal of connect reception, to regulate the power output of described output unit for maximum.
Present invention also offers a kind of LED lamp, be connected with dimmer switch, comprise above-mentioned LED light adjusting circuit.
Above-mentioned LED light adjusting circuit is by detecting the current waveform through by-pass cock, the characteristic of the Different Effects of Switch Controller electric current is regulated according to regular tap and controllable silicon, judge the type of by-pass cock thus use the power output of different control strategy control circuits, realizing the compatibility of stepless dimming and sectional dimming.Realize two different dimming functions with same circuit, then make people very easy to use, meet different product demand.
Accompanying drawing explanation
Fig. 1 is the module diagram of LED light adjusting circuit in present pre-ferred embodiments;
Fig. 2 is the circuit theory diagrams of the light adjusting circuit of LED shown in Fig. 1.
Embodiment
In order to make the technical problem to be solved in the present invention, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Refer to Fig. 1 and Fig. 2, LED light adjusting circuit in LED lamp in present pre-ferred embodiments, i.e. Switching Power Supply, this LED light adjusting circuit is connected with output L, the zero line output N of dimmer switch 10 respectively, and LED light adjusting circuit comprises rectification filtering unit 100, switching device Q1, switch control chip U1, output unit 200, sampling resistor R0 and power adjustment unit 300.Switch control chip U1 is power-supply controller of electric, and concrete model circuit is determined according to the circuit topology of selected Switching Power Supply.In the present embodiment, switch control chip U1 illustrates embodiment for model SSL2129 series of power controller.
The input of rectification filtering unit 100 meets AC power AC by dimmer switch 10, export the positive input terminal of termination output unit 200, the negative input end of the input termination output unit 200 of switching device Q1, the output of switching device Q1 is by sampling resistor R0 ground connection, switch control chip U1 passes through the control end of pwm signal to switching device Q1 of its pwm signal output 5 output, and the break-make of control switch device Q1 is to control the output voltage of output unit 200; The output (fire wire output end L or zero line output N) of one termination dimmer switch 10 of power adjustment unit 300, the pwm signal input port 3 of another termination switch control chip.The pwm signal output 5 of switch control chip U1 connects the control end of switching device Q1 by an output resistance.
Power adjustment unit 300 gathers the output voltage V of the output of dimmer switch 10
lwaveform, when waveform is normal sinusoidal wave, judges that dimmer switch 10 leads to a key switch broken for common one, power adjustment unit 300 is according to output voltage V
lthe duty ratio of the pwm signal that qualified break-make number of times regulates its output port to export, the duty ratio of the pwm signal (pwm2) that the duty cycle adjustment self (pwm signal output port 5) of the pwm signal (pwm1) that switch control chip U1 receives according to (pwm signal input port 3) exports, make-and-break time in a pulse signal of control switch device Q1 is with the power output of regulation output unit 200, the high-speed switch number of times of what this break-make number of times was corresponding is dimmer switch 10, its condition is the time of twice unlatching is more than Preset Time, Preset Time can be set as 1, 2, 3 seconds etc.When waveform is sinusoidal wave by copped wave, judge that dimmer switch 10 is as controllable silicon by-pass cock, then power adjustment unit 300 regulates the duty ratio of the pwm signal (pwm1) exported to be fixed value, the duty ratio of the pwm signal (pwm2) that switch control chip U1 self exports according to the duty cycle adjustment of the pwm signal of connect reception, the conducting always of control switch device Q1 with the power output of regulation output unit 200 for maximum, namely under current input power, the maximum power that switching power circuit can export.In the present embodiment, above-mentioned fixed value is 100%.
Rectification filtering unit 100 can utilize the circuit realiration shown in Fig. 2, also can select other traditional circuit according to the circuit topology of selected Switching Power Supply.
Output unit 200 comprises the first diode D1, magnetic bead P1, non-isolated transformer, voltage stabilizing didoe D2, the first filter capacitor C1 and the first output resistance R1.
The negative electrode of the first diode D1 connects rectification filtering unit 100 output by magnetic bead P1, the anode of the one termination first diode D1 of the main coil T1-1 of non-isolated transformer, the input of switching device Q1 and the anode of described voltage stabilizing didoe D2, the negative electrode of voltage stabilizing didoe connects the output of rectification filtering unit 100, the two ends of the first filter capacitor C1 connect the other end of the main coil T1-1 of rectification filtering unit 100 output and non-isolated transformer respectively, and the first output resistance R1 is in parallel with the first filter capacitor C1.
Output unit 200 also comprises common mode inductance T2 and the second filter capacitor C2, two inputs of common mode inductance T2 connect the two ends of the first output resistance R1 respectively, two outputs connect the two ends of the second filter capacitor C2 respectively, and the two ends of the second filter capacitor C2 are also respectively as positive-negative output end LED+, LED-of LED light adjusting circuit.
Power adjustment unit 300 comprises input detecting circuit 320 and single-chip microcomputer U2, and in the present embodiment, single-chip microcomputer U2 selects model 12CONA04 chip.In other embodiments, concrete model circuit is determined according to the circuit topology of selected Switching Power Supply.
The output of the input termination dimmer switch 10 of input detecting circuit 320, output output detections voltage V
jto the inputting testing terminal 4 of single-chip microcomputer U2.Single-chip microcomputer U2 judges the detection voltage V that input detecting circuit 320 exports
jwaveform, when waveform is normal sinusoidal wave, judges that dimmer switch 10 is for common one logical one key switch broken, single-chip microcomputer U2 is according to detecting voltage V
jqualified break-make number of times, pwm signal output 5/6 exports the pwm signal input port 3 of pwm signal (pwm1) to switch control chip U1 of the duty ratio corresponding with break-make number of times by output resistance R2, the pwm signal (pwm2) that switch control chip U1 regulates self pwm signal output port 5 to export according to this pwm signal (pwm1), the make-and-break time in a pulse signal of control switch device Q1 is to change the power output of output unit 200; When waveform is sinusoidal wave by copped wave, judge that dimmer switch 10 is as controllable silicon by-pass cock, the pwm signal output 5/6 of single-chip microcomputer U2 by output resistance R2 output duty cycle be the pwm signal (pwm1) of 100% to the pwm signal input port 3 of switch control chip U1, control switch device Q1 conducting always makes the power output of output unit 200 be maximum.
More specifically in embodiment, when waveform is normal sine wave, power adjustment unit 300 (single-chip microcomputer U2) is according to output voltage V
lqualified break-make number of times regulates the duty ratio of the pwm signal (pwm1) exported to switch control chip U1, and switch control chip U1 regulates the duty ratio of the pwm signal (pwm2) self exported identical with the duty ratio of the pwm signal that power adjustment unit 300 exports (pwm1).In other embodiments, when waveform is normal sine wave, the duty ratio of the pwm signal (pwm1) that switch control chip U1 regulates the duty ratio of the pwm signal (pwm2) self exported and power adjustment unit 300 to export can be set as changing in proportion, as one raises gradually, another reduces gradually, or both raise simultaneously or lower, but rate of change is not identical.
Input detecting circuit 320 comprises detection resistance R3, the first voltage stabilizing didoe D3, divider resistance R4 and the first electric capacity of voltage regulation C3, detect fire wire output end L or the zero line output N of a termination dimmer switch 10 of resistance R3, the negative electrode of another termination first voltage stabilizing didoe D3, the anode of the first voltage stabilizing didoe D3 connects the inputting testing terminal 4 of single-chip microcomputer U2, and by divider resistance R4 ground connection, the first electric capacity of voltage regulation C3 is in parallel with divider resistance R4.
Power adjustment unit 300 also comprises the power circuit 340 for single-chip microcomputer U2 powers.Power circuit 340 comprises starting resistance R5 and R6, the second diode D4, the second electric capacity of voltage regulation C4, the second output resistance R7, the 3rd voltage stabilizing didoe D5 and the 3rd filter capacitor C5.
One termination rectification filtering unit 100 output of starting resistance R5 and R6, the other end is by connecing the negative electrode of the second diode D4, and by the second electric capacity of voltage regulation C4 ground connection, the anode of the second diode D4 connects the Same Name of Ends of the first ancillary coil T1-2 of non-isolated transformer, the other end ground connection of this first ancillary coil T1-2, the negative electrode of the second output resistance R7 mono-termination second diode D4, the negative electrode of another termination the 3rd voltage stabilizing didoe D5 and the power port of single-chip microcomputer U2, the plus earth of the 3rd voltage stabilizing didoe D5, second filter capacitor C5 is in parallel with the 3rd voltage stabilizing didoe D5.
In the above-described embodiments, switching device Q1 is N-type metal-oxide-semiconductor, and the input of the first switching tube Q1, output, control end are respectively metal-oxide-semiconductor drain electrode, source electrode, grid.The pwm signal output 5 of switch control chip U1 connects the control end of switching device Q1 by a dead resistance R9, and this dead resistance R9 meet a reverse flow diode D6.The connected mode of other pins of switch control chip U1, with reference to figure 2, can be determined according to the circuit topology according to selected Switching Power Supply.
LED light adjusting circuit workflow is as follows: when being regular tap in circuit, after opening switch, is given to the inputting testing terminal 4 of single-chip microcomputer U2 by input detecting circuit 320 input, and this port is responsible for detecting input voltage V
lwave character, be used for being given to the switchtype in single-chip microcomputer U2 internal judgment circuit.If the result detected is regular tap, then single-chip microcomputer works in sectional dimming pattern, and when the switch motion of corresponding number of times done by switch, then single-chip microcomputer exports the pwm signal (pwm1) of corresponding default duty ratio to switch control chip U1 at pwm signal output port 5/6, the pwm signal (pwm2) that switch control chip U1 regulates self pwm signal output 5 to export according to this pwm signal (pwm1), with the make-and-break time of control switch device Q1 within a pulse period, change the peak current of LED dimming power source circuit, thus make power output be respectively maximum power/half-power/10% power three kinds state, to obtain different brightness.As opened switch for the first time, the duty ratio of the pwm signal (pwm1) of pwm signal output port 5/6 output of single-chip microcomputer U2 is 100%, the duty ratio of the pwm signal (pwm2) that switch control chip U1 exports is 100%, now exports total power; Second time shutdown switch is also opened at the appointed time, then the duty ratio of the pwm signal (pwm1) of single-chip microcomputer U2 output is 50%, the duty ratio of the pwm signal (pwm2) that switch control chip U1 exports is 50%, now exports as half-power; Third time turns off and opens switch, then the duty ratio of the pwm signal (pwm1) of single-chip microcomputer U2 output is 10%, and the duty ratio of the pwm signal (pwm2) that switch control chip U1 exports is 10%, and now exporting is 10% power.
When accessing controllable silicon by-pass cock in LED light adjusting circuit, the waveform that single-chip microcomputer U2 inputs according to input detecting circuit 320, and work in controllable silicon light modulation mode.Namely single-chip microcomputer U2 locks the duty ratio of the pwm signal (pwm1) exported is 100%, the duty ratio making switch control chip U1 lock the pwm signal (pwm2) exported is 100%, to make in thyristor regulating photoreduction process according to silicon controlled amplitude of accommodation linear change power, and segmented model can not be jumped into, silicon controlled can not be had influence on and normally work.
Single-chip microcomputer U2 is used for detecting and identifies the operating state of LED light adjusting circuit, power output is changed by the peak current changed in LED power circuit, by the duty ratio of pwm signal (pwm2) that by-pass cock control chip U1 exports, be used for switching and the mode changing output current to change power output.
LED light adjusting circuit is by detecting the current waveform through by-pass cock, the characteristic of the Different Effects of Switch Controller electric current is regulated according to regular tap and controllable silicon, judge the type of by-pass cock thus use the power output of different control strategy control circuits, realizing the compatibility of stepless dimming and sectional dimming.Realize two different dimming functions with same circuit, then make people very easy to use, meet different product demand.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a LED light adjusting circuit, is connected with dimmer switch, it is characterized in that, comprises rectification filtering unit, switching device, switch control chip, output unit, sampling resistor and power adjustment unit, wherein:
The input of described rectification filtering unit connects AC power by described dimmer switch, export the positive input terminal of output unit described in termination, the negative input end of output unit described in the input termination of described switching device, the output of described switching device is by sampling resistor ground connection, the pwm signal that described switch control chip is exported by its output, to the control end of described switching device, controls the break-make of described switching device to control the output of described output unit; The output of dimmer switch described in one termination of described power adjustment unit, the pwm signal input port of switch control chip described in another termination;
Described power adjustment unit gathers the waveform of the output voltage of the output of described dimmer switch, when described waveform is normal sine wave, described power adjustment unit regulates the duty ratio of the pwm signal exported according to the qualified break-make number of times of described output voltage, the duty ratio of the pwm signal that described switch control chip self exports according to the duty cycle adjustment of received pwm signal, to regulate the power output of described output unit; When described waveform is sinusoidal wave by copped wave, then described power adjustment unit regulates the duty ratio of the pwm signal exported to be fixed value, the duty ratio of the pwm signal that described switch control chip self exports according to the duty cycle adjustment of the pwm signal of connect reception, to regulate the power output of described output unit for maximum.
2. LED light adjusting circuit as claimed in claim 1, it is characterized in that, described power adjustment unit comprises input detecting circuit and single-chip microcomputer, the output of dimmer switch described in the input termination of described input detecting circuit, and output output detections voltage is to the inputting testing terminal of described single-chip microcomputer;
Described single-chip microcomputer judges the waveform of the detection voltage that described input detecting circuit exports, when waveform is normal sine wave, described single-chip microcomputer, according to the qualified break-make number of times of described detection voltage, exports the pwm signal of the duty ratio corresponding with described break-make number of times to described switch control chip; When waveform is sinusoidal wave by copped wave, described single-chip microcomputer output duty cycle is the pwm signal extremely described switch control chip of fixed value, makes the power output of described output unit be maximum.
3. LED light adjusting circuit as claimed in claim 1 or 2, it is characterized in that, described fixed value is 100%.
4. LED light adjusting circuit as claimed in claim 1, it is characterized in that, when described waveform is normal sine wave, described power adjustment unit regulates the duty ratio of the pwm signal exported to described switch control chip according to described output voltage qualified break-make number of times, and described switch control chip regulates the duty ratio of the pwm signal self exported identical with the duty ratio of the pwm signal that described power adjustment unit exports.
5. LED light adjusting circuit as claimed in claim 3, it is characterized in that, described input detecting circuit comprises detection resistance, the first voltage stabilizing didoe, divider resistance and the first electric capacity of voltage regulation, the fire wire output end of dimmer switch described in one termination of described detection resistance or zero line output, the negative electrode of the first voltage stabilizing didoe described in another termination, the anode of described first voltage stabilizing didoe connects the inputting testing terminal of described single-chip microcomputer, and by described divider resistance ground connection, described first electric capacity of voltage regulation is in parallel with described divider resistance.
6. LED light adjusting circuit as claimed in claim 3, is characterized in that, described power adjustment unit also comprises the power circuit of powering for described single-chip microcomputer.
7. LED light adjusting circuit as claimed in claim 6, it is characterized in that, described output unit comprises the first diode, magnetic bead, non-isolated transformer, the second voltage stabilizing didoe, the first filter capacitor and the first output resistance, wherein:
The negative electrode of described first diode connects the output of described rectification filtering unit by described magnetic bead, the anode of the anode of the first diode, the input of described switching device and described second voltage stabilizing didoe described in one termination of the main coil of described non-isolated transformer, the negative electrode of described second voltage stabilizing didoe connects the output of described rectification filtering unit, the two ends of described first filter capacitor connect the other end of the main coil of described rectification filtering unit output and described non-isolated transformer respectively, and described first output resistance is in parallel with described first filter capacitor.
8. LED light adjusting circuit as claimed in claim 7, it is characterized in that, described output unit also comprises common mode inductance and the second filter capacitor, two inputs of described common mode inductance connect the two ends of described first output resistance respectively, two outputs connect the two ends of described second filter capacitor respectively, and the two ends of described second filter capacitor are also respectively as the positive-negative output end of LED light adjusting circuit.
9. LED light adjusting circuit as claimed in claim 7, it is characterized in that, described power circuit comprises starting resistance, the second diode, the second electric capacity of voltage regulation, the second output resistance, the 3rd voltage stabilizing didoe and the 3rd filter capacitor, wherein;
Rectification filtering unit output described in one termination of described starting resistance, the other end is by connecing the negative electrode of described second diode, and by described second electric capacity of voltage regulation ground connection, the anode of described second diode connects the Same Name of Ends of the first ancillary coil of described non-isolated transformer, the other end ground connection of this first ancillary coil, the negative electrode of the second diode described in described second output resistance one termination, the negative electrode of the 3rd voltage stabilizing didoe described in another termination and the power port of described single-chip microcomputer, the plus earth of described 3rd voltage stabilizing didoe, described 3rd filter capacitor is in parallel with described 3rd voltage stabilizing didoe.
10. a LED lamp, is connected with dimmer switch, it is characterized in that, comprises the LED light adjusting circuit described in any one of claim 1 to 9.
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| CN201510070717.8A CN104661408B (en) | 2015-02-10 | 2015-02-10 | LED light adjusting circuits and LED lamp |
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| CN201510070717.8A CN104661408B (en) | 2015-02-10 | 2015-02-10 | LED light adjusting circuits and LED lamp |
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| CN104661408B CN104661408B (en) | 2017-11-03 |
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| CN110099476A (en) * | 2018-01-31 | 2019-08-06 | 长沙泰科阳微电子有限公司 | A kind of high PF Intelligent dimming circuit structure of high integration |
| CN110545606A (en) * | 2019-09-30 | 2019-12-06 | 中山市蓝德电子有限公司 | power supply method and power supply circuit adopting same |
| CN112543532A (en) * | 2020-12-15 | 2021-03-23 | 上海晶丰明源半导体股份有限公司 | Dimming control circuit and device thereof |
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| Publication number | Publication date |
|---|---|
| CN104661408B (en) | 2017-11-03 |
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