CN202696961U - Light emitting diode (LED) dimming device - Google Patents
Light emitting diode (LED) dimming device Download PDFInfo
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- CN202696961U CN202696961U CN 201220270680 CN201220270680U CN202696961U CN 202696961 U CN202696961 U CN 202696961U CN 201220270680 CN201220270680 CN 201220270680 CN 201220270680 U CN201220270680 U CN 201220270680U CN 202696961 U CN202696961 U CN 202696961U
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Abstract
The utility model relates to a light emitting diode (LED) dimming device which comprises a power source input end, a power source output end and a dimming circuit. The dimming circuit comprises a square-wave generator, a rectification filtering circuit, a compare circuit, a triangular wave generator, a metal oxide semiconductor (MOS) pipe switch circuit and a current adjusting circuit. Impedance of a current adjusting circuit is changed through adjustment of external adjustable resistance or external voltage, accordingly the duty ratio of square waves in the square-wave generator is changed, and the dimming function is achieved. Requirements of the LED dimming device for types of input power sources are not high, and the LED dimming function can also be achieved without a constant current power source. Meanwhile, dimming efficiency is high, loss is little, flicker does not occur, energy and power are saved, and safety and reliability are achieved.
Description
Technical field
The utility model relates to technical field of lighting fixtures, particularly a kind of LED dimmer.
Background technology
Present dimmer on the market roughly is divided into two large classes, and a class is controllable silicon light modulation, and its shortcoming is that light modulation has flicker, and the EMI electromagnetic interference is larger; Another kind of is the step-down constant-current dimming, and its advantage is, the light modulation process can not glimmered, and can realize far distance light regulation, and shortcoming is that cost is higher, and efficiency losses is larger, and EMI disturbs also larger.And the switching frequency of step-down dimming mode is generally more than the 50K, has larger switching loss.
Therefore, need a kind of can making things convenient for and the dimmer of high effective controlling light badly, make it have power stability, the characteristics that constant current efficient is high are to satisfy people's active demand.
The utility model content
Main purpose of the present utility model is, for above-mentioned deficiency of the prior art, provides a kind of LED dimmer, and light modulation has flicker in the above-mentioned prior art to solve, the defective that the low-loss of light modulation efficient is large.
For achieving the above object, the utility model by the following technical solutions.
The utility model provides a kind of LED dimmer, comprises power input, power output end and light adjusting circuit, and described light adjusting circuit comprises:
Square-wave generator is connected with described power input, for generation of square-wave signal;
Current rectifying and wave filtering circuit is connected with described square-wave generator, is used for described square-wave signal is carried out rectification and filtering;
Comparison circuit is connected with described current rectifying and wave filtering circuit, comprises comparator and triangular-wave generator, and described comparison circuit is used for described square-wave signal and described triangular signal are compared, and described triangular signal is carried out copped wave process;
The metal-oxide-semiconductor switching circuit is connected with described power output end, is used for the signal output with described comparison circuit, and
Current regulating circuit is connected with described square-wave generator, is used for the amplitude of regulating described square-wave signal.
Preferably, also comprise voltage amplifier circuit, described voltage amplifier circuit is arranged between described current rectifying and wave filtering circuit and the described comparison circuit.
Preferably, also comprise waveform shaping circuit, be arranged between described comparison circuit and the metal-oxide-semiconductor switching circuit, be used for the described triangular signal after the copped wave is shaped as square-wave signal.
Preferably, described current regulating circuit comprises a transformer, and described transformer comprises primary coil and secondary coil, and described primary coil is provided with adjustable resistance or PWM modulator.
Preferably, described adjustable resistance is potentiometer.
Preferably, the frequency of described triangular signal is 120HZ～130HZ.
Preferably, also comprise one or more LED light, described LED light series connection is arranged between described power input and the metal-oxide-semiconductor switching circuit.
Than above-mentioned prior art, the utlity model has following advantage.
LED dimmer of the present utility model changes the amplitude of square-wave signal by the size of regulation voltage, compare with the square-wave signal and the triangular signal that change again, thereby change the duty ratio of metal-oxide-semiconductor, to realize harmless light modulation, therefore, this LED dimmer is less demanding to the type of input power, does not need constant-current supply can realize equally light modulation effect to LED.And the efficient of light modulation is high, and loss is little, and energy saving is safe and reliable.
Description of drawings
Fig. 1 is the circuit structure block diagram of LED dimmer among the embodiment of the present utility model.
Fig. 2 is the circuit structure block diagram of LED dimmer among another embodiment of the utility model.
Fig. 3 is the circuit theory schematic diagram of LED dimmer among the another embodiment of the utility model.
Fig. 4 is the overall structure schematic diagram of middle LED dimmer embodiment illustrated in fig. 3.
The realization of the utility model purpose, functional characteristics and advantage are described further with reference to accompanying drawing in connection with embodiment.
Embodiment
Describe the technical solution of the utility model in detail below with reference to drawings and the specific embodiments, so as clearer, understand invention essence of the present utility model intuitively.
Fig. 1 is the circuit structure block diagram of LED dimmer among the embodiment of the present utility model.
With reference to shown in Figure 1, present embodiment provides a kind of LED dimmer 100, it comprises power input 1, power output end 2 and light adjusting circuit 3, can connect polytype power supply between power input 1 and the power output end 2, it for example can be constant-current supply, also can be common power supply adaptor, perhaps laptop electric power, etc.Even adopt common power supply adaptor to input as power supply, also can be by the high effective controlling light of light adjusting circuit 3 realizations to LED.
Particularly, above-mentioned light adjusting circuit 3 comprises square-wave generator 31, current rectifying and wave filtering circuit 32, comparison circuit 33 and metal-oxide-semiconductor switching circuit 34, wherein,
Square-wave generator 31 is connected with power input 1, and mainly for generation of square-wave signal, the frequency of this square wave signal can have wider scope, and present embodiment can adopt the frequency about 20KHZ.
Current rectifying and wave filtering circuit 32 is connected with above-mentioned square-wave generator 31, is mainly used in square-wave signal is carried out rectification and filtering, and the high order harmonic component in the filtering square-wave signal, and current signal carried out rectification.
Metal-oxide-semiconductor switching circuit 34 is connected with power output end 2, is used for above-mentioned result is exported by metal-oxide-semiconductor, forms the square-wave signal of variable duty ratio.
Above-mentioned square-wave generator 31 also is connected with a current regulating circuit 35, and this current regulating circuit 35 can be used for regulating the amplitude of square-wave signal.
Therefore, the LED dimmer 100 of present embodiment adopts above-mentioned light adjusting circuit 3, utilizes current regulating circuit 35 that the amplitude of square-wave signal is changed, and compares with the square-wave signal and the triangular signal that change again, by square-wave signal the copped wave of triangular signal is processed, realize the change of the duty ratio of metal-oxide-semiconductor output signal, thereby realize the output current of steady change, to be used for the light modulation of LED, and good dimming effect, do not glimmer, loss is also very low, and can effectively save electric energy.
Fig. 2 is the circuit structure block diagram of LED dimmer among another embodiment of the utility model.
With reference to shown in Figure 2, present embodiment is based on embodiment illustrated in fig. 1, itself and difference embodiment illustrated in fig. 1 are, the light adjusting circuit 3 of present embodiment also comprises voltage amplifier circuit 36, this voltage amplifier circuit 36 is arranged between current rectifying and wave filtering circuit 32 and the comparison circuit 33, being used for that the square-wave signal behind the rectifying and wave-filtering is carried out suitable amplification processes, to increase its amplitude, thereby make the adjustable extent of light adjusting circuit 3 wider, realize higher light modulation ratio, when practical application, the LED dimmer 100 of present embodiment can reach 1000: 1 light modulation ratio, has widened widely its range of application.
Simultaneously, the light adjusting circuit 3 of present embodiment also comprises waveform shaping circuit 37, these waveform shaping circuit 37 1 ends are connected with comparison circuit 33, the other end is connected 34 with the metal-oxide-semiconductor switching circuit, be used for the triangular signal after the copped wave is shaped as square-wave signal, so that this signal before entering metal-oxide-semiconductor with its rising edge and trailing edge steepen as much as possible, thereby reduce the connection loss of metal-oxide-semiconductor, raise the efficiency.
In addition, above-mentioned current regulating circuit 35 comprises a transformer, this transformer comprises again primary coil and secondary coil, be provided with adjustable resistance or PWM modulator at primary coil, when regulating above-mentioned adjustable resistance or PWM modulator, can change the electric current in the primary coil, according to electromagnetic induction principle, electric current in the secondary coil also changes thereupon, and then realizes the change of square-wave signal amplitude.For simplified structure, save production cost, the adjustable resistance of present embodiment can adopt potentiometer, and it is simple in structure, dependable performance, and also adjustable extent is large, is suitable for very much current regulating circuit.
As known from the above, present embodiment has increased voltage amplifier circuit 36 and waveform shaping circuit 37 with respect to a upper embodiment, makes dimming effect better, has also improved light modulation efficient, has reduced loss.And adopt potentiometer that the voltage of light adjusting circuit 3 is regulated, and not only simple in structure, easy to adjust, and adjustable range is wide, can realize larger light modulation ratio.
Fig. 3 is the circuit theory schematic diagram of LED dimmer among the another embodiment of the utility model; Fig. 4 is the overall structure schematic diagram of middle LED dimmer embodiment illustrated in fig. 3.
With reference to Fig. 3 and shown in Figure 4, the LED dimmer 100 that present embodiment provides has a power input 1, a power output end 2 and a light adjusting circuit 3, this power input 1 and power output end 2 all are arranged on the shell 4,3 of light adjusting circuits are enclosed in this shell, connect external circuit by binding post.
Further, light adjusting circuit 3 comprises square-wave generator 31, current regulating circuit 35, current rectifying and wave filtering circuit 32, voltage amplifier circuit 36, comparison circuit 33, waveform shaping circuit 37 and the metal-oxide-semiconductor switching circuit 34 that connects successively.Square-wave generator 31 1 ends are connected with power input 1, and the other end is by above-mentioned current regulating circuit 35 access power output ends 2.This current regulating circuit 35 comprises a transformer 351, this transformer 351 comprises primary coil and secondary coil, be provided with adjustable resistance 352 at primary coil, when regulating above-mentioned adjustable resistance 351, can change the electric current in the primary coil, according to electromagnetic induction principle, the electric current in the secondary coil also changes thereupon, and then realizes the change of square-wave signal amplitude.For simplified structure, save production cost, what the adjustable resistance 352 of present embodiment adopted is potentiometer, its adjustable extent can be chosen as 0～100K Ω, can realize 1000: 1 light modulation ratio.
In the present embodiment, square-wave generator 31 produces the square-wave signal of 20KHZ, and amplitude is determined by the voltage of input power.Square-wave signal is linked into voltage amplifier circuit after current rectifying and wave filtering circuit 32 filtering high order harmonic components, the square-wave signal gain after the rectification is amplified, and improves amplitude, and is input in the middle of the comparison circuit 33.
Processing signals is input to Shape correction in the waveform shaping circuit 37 after described comparator 331 outputs.Above-mentioned processing signals after copped wave is through after the shaping, and rising edge and trailing edge become precipitous, become the square wave of approximate ideal.The square wave input of waveform shaping circuit 37 after with above-mentioned shaping in the middle of metal-oxide-semiconductor switching circuit 34, by the HF switch effect of metal-oxide-semiconductor 341, with square wave with certain duty ratio output.
Through above-mentioned waveform processing, if add the LED lamp at the two ends of power input 1 and power output end 2 this moment, only need to regulate above-mentioned current regulating circuit 35, can realize the light modulation to the LED lamp.
Table 1 is the partial test data of the dimmer 100 of present embodiment, and is specific as follows:
Table 1
In the table 1, adjustable resistance is the Standard resistance range of adjustable resistance 352 in the current regulating circuit 35, control voltage is the input voltage between power input 1 and the power output end 2, duty ratio is the duty ratio through the square wave of metal-oxide-semiconductor 341 outputs, efficient is the ratio of power output and input power, description be LED light modulation efficient.As can be seen from Table 1, the LED dimmer 100 of present embodiment can be realized the light modulation of relative broad range, can carry out 0～100% adjusting to the duty ratio of output square wave, and duty ratio is higher, and light modulation efficient is also just higher, power output is also higher, and the brightness of LED lamp is also larger.
In theory, the triangle wave frequency is more high better, because frequency is higher, people's eyes more more be can't see flicker, but the higher switching loss of frequency is larger, and EMI disturbs larger.If frequency setting relatively rationally (between the 120-200HZ) people's eyes be can't see flicker, and there is not EMI to disturb.Thereby can realize higher light modulation efficient.But in fact, the triangle wave frequency can not surpass 1KHZ or low 120HZ, because too high frequency can increase the switching loss of metal-oxide-semiconductor 341, makes the power conversion efficiency step-down, and as too low, eye can be felt flicker.Therefore, must select a suitable scope.Through experimental verification, when the triangular wave of present embodiment adopts the frequency of 130HZ, can reach higher power conversion efficiency, and switching loss is also very little, people's eyes are imperceptible flicker also, realizes efficient flicker free light modulation.
In sum, LED dimmer of the present utility model changes the amplitude of square-wave signal by the size of regulation voltage, compare with the square-wave signal and the triangular signal that change again, thereby change the duty ratio of metal-oxide-semiconductor, to realize harmless light modulation, therefore, this LED dimmer is less demanding to the type of input power, does not need constant-current supply can realize equally light modulation effect to LED.And the efficient of light modulation is high, and loss is little, and energy saving is safe and reliable.
The above only is preferred embodiment of the present utility model; be not so limit its claim; every equivalent structure transformation that utilizes the utility model specification and accompanying drawing content to do; directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.
Claims (7)
1. a LED dimmer comprises power input, power output end and light adjusting circuit, it is characterized in that, described light adjusting circuit comprises:
Square-wave generator is connected with described power input, for generation of square-wave signal;
Current rectifying and wave filtering circuit is connected with described square-wave generator, is used for described square-wave signal is carried out rectification and filtering;
Triangular-wave generator is connected with described power input, for generation of triangular signal;
Comparison circuit is connected with triangular-wave generator with described current rectifying and wave filtering circuit, is used for rectifying and wave-filtering voltage and described triangular signal and compares, thereby produce a square wave take triangular wave as benchmark;
The metal-oxide-semiconductor switching circuit is connected with described power output end, is used for the signal output with described comparison circuit, and
Current regulating circuit is connected with described square-wave generator, is used for the pulsewidth of regulating described square-wave signal.
2. LED dimmer as claimed in claim 1, it is characterized in that: also comprise voltage amplifier circuit, described voltage amplifier circuit is arranged between described current rectifying and wave filtering circuit and the described comparison circuit.
3. LED dimmer as claimed in claim 1 is characterized in that: also comprise waveform shaping circuit, be arranged between described comparison circuit and the metal-oxide-semiconductor switching circuit, be used for the described triangular signal after the copped wave is shaped as square-wave signal.
4. LED dimmer as claimed in claim 1, it is characterized in that: described current regulating circuit comprises a transformer, and described transformer comprises primary coil and secondary coil, and described primary coil is provided with adjustable resistance or PWM modulator.
5. LED dimmer as claimed in claim 4, it is characterized in that: described adjustable resistance is potentiometer.
6. LED dimmer as claimed in claim 1, it is characterized in that: the frequency of described triangular signal is 120HZ～130HZ.
7. such as each described LED dimmer in the claim 1～6, it is characterized in that: also comprise one or more LED lamps, described LED lamp series connection is arranged between described power input and the metal-oxide-semiconductor switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220270680 CN202696961U (en) | 2012-06-08 | 2012-06-08 | Light emitting diode (LED) dimming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220270680 CN202696961U (en) | 2012-06-08 | 2012-06-08 | Light emitting diode (LED) dimming device |
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| CN202696961U true CN202696961U (en) | 2013-01-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220270680 Expired - Fee Related CN202696961U (en) | 2012-06-08 | 2012-06-08 | Light emitting diode (LED) dimming device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103607800A (en) * | 2013-03-27 | 2014-02-26 | 中感科技有限公司 | Intelligent dimming module and intelligent dimming LED lamp and control method thereof |
| WO2015135232A1 (en) * | 2014-03-13 | 2015-09-17 | 深圳市华星光电技术有限公司 | Circuit and method for reducing loss of inductance magnetic core |
| CN108633143A (en) * | 2018-07-18 | 2018-10-09 | 惠州市烁达德高光电科技有限公司 | A kind of light adjusting circuit of LED light |
| CN115278977A (en) * | 2022-09-29 | 2022-11-01 | 广东东菱电源科技有限公司 | Three-in-one dimming power supply cascade control circuit with external adjustable resistor |
-
2012
- 2012-06-08 CN CN 201220270680 patent/CN202696961U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103607800A (en) * | 2013-03-27 | 2014-02-26 | 中感科技有限公司 | Intelligent dimming module and intelligent dimming LED lamp and control method thereof |
| CN103607800B (en) * | 2013-03-27 | 2016-02-17 | 中感科技有限公司 | Intelligent dimming module and intelligent dimming LED and control method thereof |
| WO2015135232A1 (en) * | 2014-03-13 | 2015-09-17 | 深圳市华星光电技术有限公司 | Circuit and method for reducing loss of inductance magnetic core |
| CN108633143A (en) * | 2018-07-18 | 2018-10-09 | 惠州市烁达德高光电科技有限公司 | A kind of light adjusting circuit of LED light |
| CN115278977A (en) * | 2022-09-29 | 2022-11-01 | 广东东菱电源科技有限公司 | Three-in-one dimming power supply cascade control circuit with external adjustable resistor |
| CN115278977B (en) * | 2022-09-29 | 2022-12-09 | 广东东菱电源科技有限公司 | Three-in-one dimming power supply cascade control circuit with external adjustable resistor |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130123 Termination date: 20170608 |
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| CF01 | Termination of patent right due to non-payment of annual fee |