CN105992441A - LED dimming power supply - Google Patents
LED dimming power supply Download PDFInfo
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- CN105992441A CN105992441A CN201510089393.2A CN201510089393A CN105992441A CN 105992441 A CN105992441 A CN 105992441A CN 201510089393 A CN201510089393 A CN 201510089393A CN 105992441 A CN105992441 A CN 105992441A
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Abstract
A LED dimming power supply provided by the invention comprises a LED switch power supply, a shunting resistor set connected in series with the LED switch power supply, at least one shunting switch device connected in parallel with the shunting resistor set and at least one switch control device corresponding to the shunting switch device and connected in series with the shunting switch device. The LED switch power supply comprises a control unit having a detection input end. The shunting resistor set and the detection input end are connected in series to adjust the size of the input current of the detection input end. The shunting switch device includes a switch tube and at least one shunting resistor connected in series with the switch tube. The switch control device is configured to control the switch of the switch tube so as to control the shunting resistor to connect in parallel with the shunting resistor set when the switch tube is conducted and control the shunting resistor to be in the circuit break state when the switch tube is disconnected. The LED dimming power supply simplifies the circuit so as to realize the adjusting of the output current, and the generation of big current is avoided to maintain the performances of a device so as to adjust and obtain stable and accurate output current.
Description
Technical field
The present invention relates to LED power circuit, particularly a kind of LED dimming power source.
Background technology
Compared with conventional light source, LED(Light Emitting Diode, light emitting diode) it is able to rapid popularization and application because having the advantages such as light efficiency is high, light-gathering is good.Along with the use on a large scale of LED lamp, the LED power of stabilized driving voltage or electric current is provided to develop rapidly the most accordingly for LED lamp.And along with the lighting demand in productive life is constantly expanded, it is desirable to the luminosity of LED lamp can regulate accordingly along with factors such as environment.Thus, also it is accomplished by LED power and there is corresponding dimming function.
In prior art, the LED power of tunable optical typically increases operational amplification circuit in primary side, then by adjusting the sampling resistor value of the reference voltage of operational amplification circuit, thus changes the output electric current of this LED power to realize changing the brightness of LED.This LED power relatively costly, and circuit topological structure is more complicated.Additionally when LED power regulation output electric current, it is generally required to by the most parallel with one another after multiple toggle switch series resistances, then directly control the annexation between resistance to change resistance value by the break-make of toggle switch.But, the mode that LED power uses toggle switch directly to control resistance is easily caused by the electric current of this toggle switch bigger, and passage can make the contact resistance of this toggle switch change over time, and then the resistance value after making toggle switch in series with a resistor there occurs change.Thus, through using for a long time, accurately decreasing of this LED power regulation electric current output, reduce the performance of this LED power.
Summary of the invention
In view of this, the present invention provides the LED dimming power source that a kind of simple in construction, degree of regulation are stable, to solve above-mentioned technical problem.
A kind of LED dimming power source, including a LED switch power supply, one with the shunt resistance group of described LED switch power sources in series, at least one diverting switch device in parallel with described shunt resistance group, and at least one corresponding described diverting switch device the switch controlling device connected with described diverting switch device.Described LED switch power supply includes a control unit with detection input.Described shunt resistance group connects to regulate the size of the input current of this detection input with this detection input.Described diverting switch device includes a switching tube and at least one shunt resistance connected with this switching tube.Described switch controlling device for control the break-make of described switching tube with control described shunt resistance when described switching tube turns in parallel with described shunt resistance group and be in off state when described switching tube disconnects.
Compared with prior art, LED dimming power source of the present invention controls the break-make of the switching tube of diverting switch device by described switch controlling device, thus the annexation changing shunt resistance and the described shunt resistance group connected with this switching tube is connected to the resistance value detecting input of described control unit with change, and then regulate the electric current of described LED dimming power source output.On the one hand, LED dimming power source of the present invention need not the operational amplifier etc. of complexity and simplified circuit to achieve output electric current regulation.On the other hand, the switching signal that the conducting of described switching tube needs is smaller voltage signal, thus avoids producing big electric current and can regulate the output electric current obtaining lasting accuracy with retainer member performance.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, embodiments of the invention are described, wherein:
The schematic diagram of the embodiment one of a kind of LED dimming power source that Fig. 1 provides for the present invention.
Fig. 2 is the circuit diagram of the LED dimming power source of Fig. 1.
Fig. 3 is the circuit diagram of the switch controlling device of the LED dimming power source of Fig. 2.
The circuit diagram of the embodiment two of a kind of LED dimming power source that Fig. 4 provides for the present invention.
The circuit diagram of the embodiment three of a kind of LED dimming power source that Fig. 5 provides for the present invention.
The circuit diagram of the embodiment four of a kind of LED dimming power source that Fig. 6 provides for the present invention.
Detailed description of the invention
Below based on accompanying drawing, the specific embodiment of the present invention is further elaborated.It should be appreciated that the protection domain herein explanation of the embodiment of the present invention being not intended to limit the present invention.
Refer to Fig. 1, Fig. 2, the schematic diagram of its a kind of LED dimming power source 100 provided for the present invention and circuit diagram.Described LED dimming power source 100 includes a LED switch power supply 10, one shunt resistance group 20 connected with described LED switch power supply 10, at least one diverting switch device 30 in parallel with described shunt resistance group 20, and at least one corresponding described diverting switch device 30 switch controlling device 40 connected with described diverting switch device 30.
Described LED switch power supply 10 includes a control unit 11 with detection input.It is envisioned that described LED switch power supply 10 also includes the functional module such as current rectifying and wave filtering circuit, transformator.Described Switching Power Supply 10 incoming transport electricity, and carry out the process such as rectifying and wave-filtering, blood pressure lowering.Described control unit 11 is for controlling the size of the output curtage of described LED dimming power source 100.Described control unit 11 can be an AC/DC(exchange input direct-current output) control chip N1.This AC/DC control chip N1 is for controlling the output size of current of described LED dimming power source 100.It is contemplated that, described AC/DC control chip N1 can be electrically connected at the primary survey of transformator.The model of this AC/DC control chip, specification are all the technology known by those skilled in the art, the most no longer describe in detail at this.Described control unit 11 has detection input for receiving feedback voltage signal produced by described shunt resistance group 20 and the shunt resistance 32 of described diverting switch device 30 and controlling to adjust the output curtage of described LED switch power supply 10 according to this signal, to reach the purpose of light modulation.
Described shunt resistance group 20 connects to regulate the size of the input current of this detection input with the detection input of described control unit 11.Described shunt resistance group 20 can simply be the resistance of a fixed resistance value, as long as the resistance of this resistance meets the different input currents required for shunt resistance 32 parallel connection from described diverting switch device 30 obtains with regulation.The title being somebody's turn to do " shunt resistance group " 20 is intended merely to distinguish with the title of " shunt resistance " 32 of described diverting switch device 30.In the present embodiment, in order to obtain preferably heat dispersion and reduction power consumption, described shunt resistance group 20 includes resistance R22, R23 that at least two is in parallel.
Described diverting switch device 30 is in parallel with described shunt resistance group 20.Described diverting switch device 30 includes a switching tube 31 and at least one shunt resistance 32 connected with this switching tube 31.Described switching tube 31 is used for shunt resistance 32 described in break-make to change the annexation of this shunt resistance 32 and described shunt resistance group 20.When switching tube 31 turns on, described shunt resistance 32 is in parallel with described shunt resistance group 20.Otherwise, when switching tube 31 disconnects, described shunt resistance 32 is in off state and is not electrically connected with described shunt resistance group 20.Described switching tube 31 can be a metal-oxide-semiconductor (Metal-Oxide-Semiconductor,
Mos field effect transistor) or audion.In the present embodiment, as in figure 2 it is shown, described switching tube 31 is a metal-oxide-semiconductor.Further, described metal-oxide-semiconductor is a N-channel MOS pipe Q3.The grid of this N-channel MOS pipe Q3 is electrically connected with described switch controlling device 40, and source electrode is connected with described shunt resistance 32, and drain electrode is electrically connected with the detection input of described control unit 11.In the present embodiment, described shunt resistance 32 is a resistance R24 connected with described switching tube 31.The resistance size of described shunt resistance 32 determines according to the output electric current of described LED dimming power source 100, thus described shunt resistance 32 can also carry out connection in series-parallel to realize specific resistance according to by several resistance.The specification of described shunt resistance 32 is all prior art, just repeats no more at this.
See also Fig. 3, described switch controlling device 40 for control the break-make of described switching tube 31 with control described shunt resistance 31 when this switching tube 31 turns in parallel with described shunt resistance group 20 and be in off state when described switching tube 31 disconnects.Described switch controlling device 40 is connected with described diverting switch device 30.Described switch controlling device 40 includes a toggle switch 41.The break-make of this toggle switch 41 controls the break-make of described switching tube 31.In this embodiment one, described toggle switch 41 is one to be had conducting ON key and disconnects the toggle switch S1 of OFF key.Further, described switch controlling device 40 also includes that at least one resistance 42 connected with described toggle switch 41 is loaded into the voltage on described switching tube 31 for dividing potential drop to reduce.In this embodiment one, described switch controlling device 40 includes two resistance R20, R21 connected.One end of described switching tube 31 is connected between said two resistance R20, R21.In this embodiment one, the grid of the N-channel MOS pipe Q3 of described switching tube 31 is connected between said two resistance R20, R21.Resistance R20, R21 of said two series connection can give conducting voltage that the grid of described N-channel MOS pipe Q3 provides safety so that this N-channel MOS pipe Q3 can turn on and can safe and stable operation.It is envisioned that the switching signal of the metal-oxide-semiconductor Q3 of described switching tube 31 is less voltage signal, it is only necessary to described toggle switch 41 provides voltage signal without producing big electric current by this toggle switch 41.Thus, described LED dimming power source 100 it can be avoided that big electric current to the damage of device to maintain device performance such that it is able to the output electric current of regulation acquisition lasting accuracy.
In embodiment one, the Principles of Regulation that described LED dimming power source 100 exports electric current are as follows: it is conceivable that, for primary side feedback PSR, size Io=N*Vpk/ (2*Rcs) of output electric current, wherein Vpk is that the AC/DC control chip by described control unit 11 itself determines, N is the turn ratio of transformator, thus output electric current Io and sampling resistor Rcs is inverse relation.Thus, when described toggle switch 41 turns on, the grid of the N-channel MOS pipe Q3 of described switching tube 31 is that high level turns on, the resistance of the R24 of the described shunt resistance 32 detection input that reduce the AC/DC control chip that be connected to described control unit 11 in parallel with resistance R22, R23 of described shunt resistance group 20 respectively, thus increase the input current of this detection input.When described toggle switch 41 disconnects, the grid of the N-channel MOS pipe Q3 of described switching tube 31 is that low level is ended, the R24 of described shunt resistance 32 is also at off state, when comparing conducting, the resistance of the detection input of described AC/DC control chip increases, thus reduces the input current of this detection input.
Compared with prior art, LED dimming power source 100 of the present invention controls the break-make of the switching tube 31 of diverting switch device 30 by described switch controlling device 40, thus the annexation changing the shunt resistance 32 and described shunt resistance group 20 connected with this switching tube 31 is connected to the resistance value detecting input of described control unit 11 with change, and then regulate the electric current of described LED dimming power source 100 output.On the one hand, LED dimming power source 100 of the present invention need not the operational amplifier etc. of complexity and simplified circuit to achieve output electric current regulation.On the other hand, the switching signal that the conducting of described switching tube 31 needs is smaller voltage signal, thus avoids producing big electric current and can regulate the output electric current obtaining lasting accuracy with retainer member performance.
Refer to the embodiment two shown in Fig. 4, described LED dimming power source 200 includes a LED switch power supply 210, one shunt resistance group 220 connected with described LED switch power supply 210, at least one diverting switch device 230 in parallel with described shunt resistance group 220, and at least one corresponding described diverting switch device 230 switch controlling device 240 connected with this diverting switch device 230.Described LED switch power supply 210 includes a control unit 211 with detection input.Embodiment two is with the difference of embodiment one: the quantity of described diverting switch device 230 and switch controlling device 240 can be two or more.In this embodiment two, described diverting switch device 230 is n, and n is more than or equal to 2.Each diverting switch device 230 described is in parallel with described shunt resistance group 220 respectively.Accordingly, described switch controlling device 240 is also equal n.And each described switch controlling device 240 connects a described diverting switch device 230, respectively to control the break-make of this diverting switch device 230.Described diverting switch device 230 includes a switching tube 231 and at least one shunt resistance 232 connected with this switching tube 231 respectively.Described switch controlling device 240 includes a toggle switch 241 respectively.This each toggle switch 241 correspondence respectively controls the break-make of each switching tube 231 described.Thus, controlled the break-make of corresponding two or more switching tube 231 by two or more described switch controlling devices 240 respectively, thus realize various states that is in parallel with described shunt resistance group 220 respectively with the shunt resistance 232 that this switching tube 231 is connected or that disconnect.Thus, described LED dimming power source 200 is bigger for the range of accommodation of output electric current.
Refer to the embodiment three shown in Fig. 5, described LED dimming power source 300 includes a LED switch power supply 310, one shunt resistance group 320 connected with described LED switch power supply 310, at least one diverting switch device 330 in parallel with described shunt resistance group 320, and at least one this device 330 of corresponding described diverting switch the switch controlling device 340 connected with this diverting switch device 330.Described diverting switch device 330 includes a switching tube 331 and at least one shunt resistance 332 connected with this switching tube 331.Embodiment three is with the difference of embodiment one: described switch controlling device 340 includes an optocoupler 341.The break-make of this optocoupler 341 controls the break-make of described switching tube 331.Further, described switch controlling device 340 also include at least one resistance connected with described optocoupler 341 for dividing potential drop to reduce the voltage on described switching tube 331.In this embodiment three, described switch controlling device 40 includes two resistance R20, R21 connected.One end of described switching tube 331 is electrically connected between said two resistance R20, R21.In this embodiment three, described optical coupler 341 includes luminous organ N2A and light-receiving device N2B.Described optocoupler 341, can be referred to as again photoelectrical coupler, and its model, performance are all prior art, do not describe in detail at this.Described optocoupler 341 is for controlling the break-make of described switching tube 331, thus changes the annexation of described shunt resistance 332 and described shunt resistance group 320, finally makes described LED dimming power source 300 export electric current and changes.When the signal that described optocoupler 341 receives is high level, this optocoupler 341 turns on to provide conducting voltage to open this switching tube 331 to described switching tube 331.When the signal that described optocoupler 341 receives is low level, this optocoupler 341 disconnects and makes described switching tube 331 end and turn off.It is envisioned that described optocoupler 341 can according to receive any level signal and break-make.Described level signal can be sent by the cut controller of input side, the infrared inductor of primary side or microwave sensor etc., and it is not emphasis of the present invention, just repeats no more at this.
Refer to the embodiment four shown in Fig. 6, described LED dimming power source 400 includes a LED switch power supply 410, one shunt resistance group 420 connected with described LED switch power supply 410, at least one diverting switch device 430 in parallel with described shunt resistance group 420, and at least one this device 430 of corresponding described diverting switch the switch controlling device 440 connected with this diverting switch device 430.Described diverting switch device 430 includes a switching tube 431 and at least one shunt resistance 432 connected with this switching tube 431.Embodiment four is with the difference of embodiment one: described LED switch power supply 410 includes a control unit 411 with detection input.This control unit 411 is a DC/DC(DC-DC) control chip.This DC/DC control chip is for controlling the output size of current of described LED dimming power source 400.It is envisioned that described DC/DC control chip is connected to the primary side of the transformator of LED switch power supply 410.And this DC/DC control chip has the detection input voltage signal for the feedback receiving described shunt resistance group 420 and described shunt resistance 432, thus regulate electric current output.The model of described DC/DC control chip, specification are all prior art, the most no longer describe in detail at this.In this embodiment four, described diverting switch device 430 is n, and n is more than or equal to 2.Each diverting switch device 430 described is in parallel with described shunt resistance group 420 respectively.Accordingly, described switch controlling device 440 is also equal n.And each described switch controlling device 440 connects a described diverting switch device 430, respectively to control the break-make of this diverting switch device 430.In this embodiment four, it is connected to that detection two parallel resistances R22 that resistance value is described shunt resistance group 420 of input, the R23 of described DC/DC control chip be in parallel with any amount R24 in n R24 in shunt resistance 432 or total resistance value after disconnection.It is contemplated that, described LED dimming power source 400 exports size of current and the resistance value of the detection input being connected to described DC/DC control chip is inversely prroportional relationship.
These are only presently preferred embodiments of the present invention, be not used to limit to protection scope of the present invention, any amendment, equivalent or improvement etc. in spirit of the present invention, all contain in scope of the presently claimed invention.
Claims (10)
- null1. a LED dimming power source，It is characterized in that: described LED dimming power source includes a LED switch power supply，One with the shunt resistance group of described LED switch power sources in series，At least one diverting switch device in parallel with described shunt resistance group，And at least one corresponding described diverting switch device the switch controlling device connected with described diverting switch device，Described LED switch power supply includes a control unit with detection input，Described shunt resistance group connects to regulate the size of the input current of this detection input with this detection input，Described diverting switch device includes a switching tube and at least one shunt resistance connected with this switching tube，Described switch controlling device for control the break-make of described switching tube with control described shunt resistance when described switching tube turns in parallel with shunt resistance group and be in off state when described switching tube disconnects.
- LED dimming power source the most according to claim 1, it is characterised in that: described control unit is an AC/DC control chip, and this AC/DC control chip is for controlling the output size of current of described LED dimming power source.
- LED dimming power source the most according to claim 1, it is characterised in that: described shunt resistance group includes the resistance that at least two is in parallel.
- LED dimming power source the most according to claim 1, it is characterised in that: described switching tube is a metal-oxide-semiconductor or audion.
- LED dimming power source the most according to claim 4, it is characterized in that: described metal-oxide-semiconductor is a N-channel MOS pipe, the grid of this N-channel MOS pipe is electrically connected with described switch controlling device, and source electrode is connected with described shunt resistance, and drain electrode is electrically connected with the detection input of described control unit.
- LED dimming power source the most according to claim 1, it is characterised in that: described switch controlling device includes a toggle switch or optocoupler, and the break-make of this toggle switch or optocoupler controls the break-make of described switching tube.
- LED dimming power source the most according to claim 6, it is characterised in that: described switch controlling device also include at least one resistance connected with described toggle switch or optocoupler for dividing potential drop to reduce the voltage on described switching tube.
- LED dimming power source the most according to claim 7, it is characterised in that: described switch controlling device includes two resistance connected, and one end of described switching tube is electrically connected between said two resistance.
- LED dimming power source the most according to claim 1, it is characterized in that: described LED dimming power source includes multiple diverting switch device, and the switch controlling device that multiple and described diverting switch device is corresponding, each switch controlling device controls the break-make of a corresponding diverting switch device.
- LED dimming power source the most according to claim 1, it is characterised in that: described control unit is a DC/DC control chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510089393.2A CN105992441A (en) | 2015-02-27 | 2015-02-27 | LED dimming power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510089393.2A CN105992441A (en) | 2015-02-27 | 2015-02-27 | LED dimming power supply |
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| CN105992441A true CN105992441A (en) | 2016-10-05 |
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| CN201510089393.2A Pending CN105992441A (en) | 2015-02-27 | 2015-02-27 | LED dimming power supply |
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| CN107770910A (en) * | 2017-10-30 | 2018-03-06 | 上海阿卡得电子有限公司 | A kind of LED is segmented multistage dimming driving circuit |
| CN107787091A (en) * | 2017-11-17 | 2018-03-09 | 上海阿卡得电子有限公司 | A kind of dialing LED multistage light adjusting circuits |
| CN114205945A (en) * | 2021-11-24 | 2022-03-18 | 广东新昇电业科技股份有限公司 | Four-in-one dimming circuit adopting primary side feedback and constant voltage |
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| CN114205945A (en) * | 2021-11-24 | 2022-03-18 | 广东新昇电业科技股份有限公司 | Four-in-one dimming circuit adopting primary side feedback and constant voltage |
| CN114205945B (en) * | 2021-11-24 | 2022-10-11 | 广东新昇电业科技股份有限公司 | Four-in-one dimming circuit adopting primary side feedback and constant voltage |
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Application publication date: 20161005 |