CN102858061A - LED (light-emitting diode) power supply circuit controlled by multiple sections of switches - Google Patents
LED (light-emitting diode) power supply circuit controlled by multiple sections of switches Download PDFInfo
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- CN102858061A CN102858061A CN2012102927728A CN201210292772A CN102858061A CN 102858061 A CN102858061 A CN 102858061A CN 2012102927728 A CN2012102927728 A CN 2012102927728A CN 201210292772 A CN201210292772 A CN 201210292772A CN 102858061 A CN102858061 A CN 102858061A
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Abstract
The invention discloses an LED (light-emitting diode) power supply circuit controlled by multiple sections of switches. The LED power supply circuit controlled by multiple sections of switches comprises a rectifier bridge, a switch control circuit, a plurality of switches and a plurality of LED groups, wherein the rectifier bridge is used for converting alternating-current electric waves into direct-current electric waves; the switch control circuit is connected with the rectifier bridge and is used for generating multiple pulse signals according to the voltage input by the rectifier bridge; the number of the plurality of switches is equal to the number of a plurality of pulse signals, and the plurality of switches switch on or switch off the corresponding LED groups according to the plurality of generated pulse signals; the number of the plurality of LED groups is equal to the number of the plurality of switches, and each of the plurality of switches is connected to one corresponding LED group. According to the invention, by utilizing the mode of multiple sections of switches, LED units with different combinations are lighted up, thus the integral electric consumption can be corresponding to the input electricity, and the power factor requirement of a power system is met; and the LED power supply circuit controlled by the multiple switches is realized by adopting the novel semiconductor technology, and is suitable for mass production.
Description
Technical field
The present invention relates to electronic technology field, particularly a kind of LED power circuit that utilizes Multi-band switch control.
Background technology
LED illumination is a kind of new and effective solid light source, have pollution less, save the advantages such as power supply, long service life, so LED will get a lot of applications aspect illumination.Because LED is semiconductor, driven by low-voltage direct-current, so need the design of current transformer.And be converted in the process of low-voltage DC at High Level AC Voltage, can cause electric current unequal, this becomes the low reason of power factor (PF).
Summary of the invention
Technical problem to be solved by this invention is: the High Level AC Voltage at LED is converted in the process of low-voltage DC, how to overcome the problem of low-power factor.The present invention aims to provide simply a kind of and meets especially the LED power circuit of LED characteristic, can effectively solve the demand of LED power supply.
Additional advantages of the present invention, purpose and characteristic, a part will be elucidated in the following description, and another part will be significantly for those of ordinary skill in the art by the investigation to following explanation or acquire from enforcement of the present invention.Can realize and obtain the object of the invention and advantage by the structure of in the specification of literal and claims and accompanying drawing, pointing out especially.
The invention provides a kind of LED power circuit that utilizes Multi-band switch control, it is characterized in that, the described LED power circuit of Multi-band switch control that utilizes comprises:
Rectifier bridge is used for converting AC wave to the direct current electric wave;
ON-OFF control circuit, it is connected with described rectifier bridge, is used for generating a plurality of pulse signals according to the voltage by described rectifier bridge input;
A plurality of switches, the quantity of described a plurality of switches is identical with the quantity of a plurality of pulse signals, and described a plurality of switches are according to the described a plurality of pulse signals that generate, and the corresponding LED of switch organizes;
A plurality of LED groups, the quantity of described a plurality of LED groups is identical with the quantity of described a plurality of switches, and each in described a plurality of switches all is connected to a corresponding described LED group.
According to one preferred embodiment of the present invention, ON-OFF control circuit comprises many groups resistance in parallel pair, the right quantity of the resistance of described parallel connection is identical with the quantity of described a plurality of switches, and the resistance of each described parallel connection is to an equal corresponding switch, first resistance and second resistance of the resistance of each described parallel connection to including series connection is connected between described the first resistance and the second resistance a corresponding switch with described resistance.
According to one preferred embodiment of the present invention, the LED number in each LED group can be identical can be not identical yet.
The present invention utilizes the mode of Multi-band switch, and the LED unit of various combination is lighted, and whole power consumption can be consistent with input current, satisfies the power factor (PF) requirement of electric power system.The present invention can adopt new semiconductor technology to realize, is fit to large-scale production.
Description of drawings
Fig. 1 is the illustrative view of functional configuration according to the LED power circuit that utilizes Multi-band switch control of embodiment of the present invention.
Fig. 2 shows the schematic diagram that the alternating current of inputting is carried out rectification.
Fig. 3 is for generating the schematic diagram of a plurality of pulse signals.
Fig. 4 is the electric current of the LED that finally flows through.
Fig. 5 is the electrical block diagram according to the LED power circuit that utilizes Multi-band switch control of embodiment of the present invention.
Embodiment
With reference to the accompanying drawings the present invention is described more fully, exemplary embodiment of the present invention wherein is described.
Fig. 1 shows the illustrative view of functional configuration according to the LED power circuit that utilizes Multi-band switch control of embodiment of the present invention.As shown in Figure 1, according to a preferred embodiment of the present invention, a kind of LED power circuit of Multi-band switch control that utilizes comprises: rectifier bridge 2 is used for converting AC wave to the direct current electric wave; ON-OFF control circuit b, it is connected with described rectifier bridge 2, is used for generating a plurality of pulse signals according to the voltage by described rectifier bridge 2 inputs, and in an embodiment of the present invention, the pulse signal that generates is 3.1,3.2,3.3 ..., 3.N (N is positive integer); A plurality of switches, the quantity of described a plurality of switches is identical with the quantity of a plurality of pulse signals, and described a plurality of switches are according to the described a plurality of pulse signals that generate, and the corresponding LED of switch organizes; A plurality of LED groups, the quantity of described a plurality of LED groups is identical with the quantity of described a plurality of switches, and each in described a plurality of switches all is connected to a corresponding described LED group.
According to a preferred embodiment of the present invention, according to the integral illumination requirement, whole led chips are divided into described a plurality of LED group, the LED in each LED group) number can be identical can be not identical yet, the quantity of LED group can be set as required by those skilled in the art.
Fig. 2 shows the schematic diagram that the alternating current of inputting is carried out rectification.As shown in Figure 2, the electric main of input is 110V or 220V.Carry out the direct current ripple after the output rectification after the rectification through rectifier bridge 2.Rectifier bridge is the circuit of commonly using to those skilled in the art, therefore no longer gives unnecessary details in this article.
Fig. 3 is for generating the schematic diagram of a plurality of pulse signals.As shown in Figure 3, ON-OFF control circuit b generates a plurality of pulse signals 3.1,3.2,3.3 according to through the direct current ripple after the rectifier bridge rectification ..., 3.N.As seen from Figure 3, the duration of each pulse signal is all different, and from pulse signal 3.1 to pulse signal 3.N, the duration of pulse signal reduces successively.During pulse signal 3.1, it is 1 bright that LED organizes, the like, during pulse signal 3.N, N is bright for the LED group.
Fig. 4 is the electric current of the LED that finally flows through.The electric current of the described LED that finally flows through can be followed the variation of ac input voltage, by the number of LED grouping number, reaches the requirement of power factor (PF).
Fig. 5 is the electrical block diagram according to the LED power circuit that utilizes Multi-band switch control of embodiment of the present invention.As shown in Figure 5, ON-OFF control circuit 5 wherein comprises many groups resistance in parallel pair, the right quantity of the resistance of described parallel connection is identical with the quantity of described a plurality of switches, and the resistance of each described parallel connection is to an equal corresponding switch, resistance 1 and the resistance 2 of the resistance of each described parallel connection to including series connection is connected between described resistance 1 and the resistance 2 a corresponding switch with described resistance.
Below in conjunction with Fig. 3 and Fig. 5, the present invention is further described.As seen from Figure 5, the voltage of opening switch 1 is minimum, and from switch 1 to switch N, the voltage of opening switch raises gradually.The number of switch N is corresponding with the number of LED group, and concrete quantity can be set according to actual needs by those skilled in the art.Corresponding to Fig. 3 as can be known, the voltage of pulse 3.1 is minimum, and from pulse 3.1 to pulse 3.N, pulse voltage progressively raises, and the voltage of pulse 3.N is maximum.The duration of pulse 3.1 is the longest, that is to say that LED 1 time that is lit of group is the longest, and from pulse 3.1 to pulse 3.N, the duration length of pulse is progressively successively decreased.From Fig. 3, it can also be seen that, because the voltage of pulse 3.N is the highest, so in the time period that LED group N is lit, all LED groups all are lit.
According to a preferred embodiment of the invention, each resistance centering, the resistance of R1 is 1M, and the resistance of R2 is 20K.Certainly, those skilled in the art can adjust the resistance value of each resistance centering R1 and R2 according to actual needs.Certainly those skilled in the art can also change the quantity of each resistance centering resistance.The size and number of resistance has determined the height of pulse voltage.
The present invention is through Computer Simulation and experiment, can satisfy easily power factor (PF) 0.7 or more than, when N=4, power factor (PF) can reach 0.9.Simultaneously the present invention institute can both be with semiconductor technology production parts that expand, and all components can be finished in a semiconductor device, will easier realization all-semiconductor illumination application.
Above content is preferred embodiment of the present invention only, for those of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, and this description should not be construed as limitation of the present invention.
Claims (3)
1. a LED power circuit that utilizes Multi-band switch control is characterized in that, the described LED power circuit of Multi-band switch control that utilizes comprises:
Rectifier bridge is used for converting AC wave to the direct current electric wave;
ON-OFF control circuit, it is connected with described rectifier bridge, is used for generating a plurality of pulse signals according to the voltage by described rectifier bridge input;
A plurality of switches, the quantity of described a plurality of switches is identical with the quantity of a plurality of pulse signals, and described a plurality of switches are according to the described a plurality of pulse signals that generate, and the corresponding LED of switch organizes;
A plurality of LED groups, the quantity of described a plurality of LED groups is identical with the quantity of described a plurality of switches, and each in described a plurality of switches all is connected to a corresponding described LED group.
2. the LED power circuit that utilizes Multi-band switch control according to claim 1, it is characterized in that, ON-OFF control circuit comprises many groups resistance in parallel pair, the right quantity of the resistance of described parallel connection is identical with the quantity of described a plurality of switches, and the resistance of each described parallel connection is to an equal corresponding switch, first resistance and second resistance of the resistance of each described parallel connection to including series connection is connected between described the first resistance and the second resistance a corresponding switch with described resistance.
3. the LED power circuit that utilizes Multi-band switch control according to claim 1 and 2 is characterized in that, the LED number in each LED group can be identical can be not identical yet.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012102927728A CN102858061A (en) | 2012-08-17 | 2012-08-17 | LED (light-emitting diode) power supply circuit controlled by multiple sections of switches |
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| CN2012102927728A CN102858061A (en) | 2012-08-17 | 2012-08-17 | LED (light-emitting diode) power supply circuit controlled by multiple sections of switches |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103517520A (en) * | 2013-09-10 | 2014-01-15 | 深圳市晟碟半导体有限公司 | LED driving device |
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Application publication date: 20130102 |