CN101400206A - Power supply apparatus, light regulating circuit and light regulating method - Google Patents
Power supply apparatus, light regulating circuit and light regulating method Download PDFInfo
- Publication number
- CN101400206A CN101400206A CNA2007101623226A CN200710162322A CN101400206A CN 101400206 A CN101400206 A CN 101400206A CN A2007101623226 A CNA2007101623226 A CN A2007101623226A CN 200710162322 A CN200710162322 A CN 200710162322A CN 101400206 A CN101400206 A CN 101400206A
- Authority
- CN
- China
- Prior art keywords
- power supply
- supply unit
- control circuit
- coupled
- mutually
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
Abstract
A light regulating circuit for performing light modulation of a lamp, gradually reduces the output current if a power supply ti a lamp tube during light modulation, and use the relation of the gain of the lamp tube and the frequency to close the power supply when the frequency of the output current exceeds a predetermined value, thereby reaching a light modulation effect, and extending the service life of the lamp tube.
Description
Technical field
The invention relates to a kind of light adjusting circuit and a kind of power supply unit, particularly a kind of light adjusting circuit that is used for a fluorescent tube, and the power supply unit that comprises a light adjusting circuit.
Background technology
Illumination has become some indispensable in the modern life, generally is used at present as lamp source person, and still be fluorescent tube.Generally speaking, drive lamp luminescence and need produce an AC power, and the frequency of AC power need cooperate the impedance operator of fluorescent tube, remains on 40K hertz (Hz) between the 80K hertz.When the frequency of AC power is too high or too low, all can cause the impedance of fluorescent tube to increase, meaning is that the gain (gain) of fluorescent tube will be lowered.
For cooperating the demand of different situations, the power supply unit of fluorescent tube also can design in order to adjust the output brightness of fluorescent tube, promptly has dimming function.Generally speaking, the power supply unit of fluorescent tube is all taked the design of pulse width modulation, therefore dimming function can be realized by the work period (duty cycle) of adjusting power supply unit, perhaps by the output frequency that increases power supply unit, gained and realized to reduce fluorescent tube.
Aforesaid way is when carrying out light modulation, still export energy to fluorescent tube, because the useful life of fluorescent tube and the time of lamp tube starting have positive correlation, light modulation simultaneously is the purpose that realizes reducing fluorescent tube output brightness, still export energy to fluorescent tube when therefore carrying out light modulation, except that increasing unnecessary energy loss, also can lower fluorescent tube useful life.
Therefore, how to provide to have the energy savings prolonging lamp tube light adjusting circuit in useful life, for this reason the industry in field need the target of effort badly.
Summary of the invention
A purpose of the present invention is to provide a kind of light adjusting circuit, in order to carry out light modulation at a fluorescent tube, to reduce the output current of a power supply unit when the light modulation gradually to fluorescent tube, and utilize the gain and the frequency relation of fluorescent tube, when the frequency of output current surpasses a predetermined value, the powered-down supply is realized dimming effect whereby, and prolonging lamp tube useful life.
Another object of the present invention is to provide a kind of power supply unit, comprise a light adjusting circuit, carry out light modulation at a fluorescent tube, to lower the output current of a power supply unit when the light modulation gradually to fluorescent tube, and utilize the gain and the frequency relation of fluorescent tube, and when the frequency of output current surpasses a predetermined value, the powered-down supply, realize dimming effect whereby, and prolonging lamp tube useful life.
For achieving the above object, the present invention discloses a kind of light adjusting circuit, comprise one and switch an element and an adjusting control circuit, this switching device is coupled to a control circuit of a power supply unit, this adjusting control circuit is coupled to this switching device and receives a dim signal, should switch this switching device by dim signal mutually, this power control circuit mutually should switching device switching will exchange a frequency of exporting and be increased to a frequency separation, and close this power supply unit during above a predetermined value in this frequency.
Another purpose of the present invention is to provide a kind of light-dimming method, exchanges output in order to adjust one of a power supply unit, and this power supply unit is in order to power supply to a fluorescent tube, and this method comprises: a corresponding dim signal produces a dimming control signal; Should adjust a frequency of this interchange output between a frequency separation by dimming control signal mutually; And when this frequency surpasses a predetermined value, close this interchanges of this power supply unit and export, realize dimming effect whereby, and prolonging lamp tube useful life.
Description of drawings
For purpose, technical characterictic and the advantage stated of the present invention can be become apparent, below in conjunction with accompanying drawing preferred embodiment of the present invention is elaborated, wherein:
Fig. 1 one comprises the circuit diagram of the power supply unit of a light adjusting circuit;
Fig. 2 is the gain and the frequency relation schematic diagram of a fluorescent tube;
Fig. 3 is the current waveform schematic diagram of a fluorescent tube when light modulation; And
Fig. 4 is the circuit diagram of a light adjusting circuit, an optical coupler and a protective circuit.
Embodiment
Below will explain content of the present invention by embodiment, it is about a light adjusting circuit, and a power supply unit that comprises a light adjusting circuit, and powered-down supply suitably when being used to light modulation is to reach the purpose of power saving and prolonging lamp tube service life.Yet embodiments of the invention are not to need can implement as the described any particular environment of embodiment, application or particular form in order to restriction the present invention.Therefore, only be explaination purpose of the present invention about the explanation of embodiment, but not in order to restriction the present invention.Need the expositor, in following examples and the accompanying drawing, omit and do not illustrate with the non-directly related element of the present invention; And for the purpose of asking easy understanding, each interelement size relationship is to show with exaggerative slightly ratio.
Fig. 1 one comprises the circuit diagram of the power supply unit of a light adjusting circuit.This power supply unit receives direct current power supply input Vin, is in order to power supply to a fluorescent tube 18, so power supply unit provides one to exchange output.Power supply unit comprises an energy conversion component 11, a power control circuit 12, a light adjusting circuit 13, an optical coupler 14 and a protective circuit 15.Energy conversion component 11 is a transformer in the present embodiment, comprises a power conversion input 111 and a power conversion output 112, and energy conversion component 11 is coupled to an output of power supply unit.Power control circuit 12 comprises a power control circuit 121 and is coupled to this energy conversion component 11, and a control circuit 122.The control signal 101 of power control circuit 121 reception control circuits 122 wherein is to provide energy to energy conversion component 11.
From the above, in the present embodiment, light adjusting circuit 13 comprises three end points, is respectively one first end points 131, one second end points 132 and one the 3rd end points 133, switches element 134, is a transistor, an and adjusting control circuit 135 in the present embodiment.Switching device 134 is coupled to first end points 131 and second end points 132, and wherein first end points 131 power control circuit 12, the second end points 132 that are coupled to power supply unit are coupled to an earth terminal.Adjusting control circuit 135 is coupled to the 3rd end points 133 and switching device 134, wherein the 3rd end points 133 is fitted and can be received a dim signal 102, adjusting control circuit 135 corresponding dim signals 102 produce a dimming control signal 103, adjusting control circuit 135 corresponding dimming control signals 103 switch this switching device 134 simultaneously, the frequency that the switching of 12 corresponding switching devices 134 of power control circuit will exchange output is increased to a frequency separation, and closes this power supply unit when frequency surpasses a predetermined value.
Specifically, dim signal 102 comes a system of self-contained power supply unit, in order to adjust the brightness of fluorescent tube 18.Please in the lump with reference to figure 2, it is the schematic diagram that concerns of fluorescent tube gain (gain) and frequency, and by being maximum as if desiring to keep the fluorescent tube gain as can be known among the figure, then fluorescent tube 18 need operate in appropriate frequency, generally speaking, is about 40K hertz (Hz) to the 80K hertz.When frequency surpasses the 40K hertz and continues to increase, the fluorescent tube gain will descend, and generally speaking, when frequency surpassed 200K, the fluorescent tube gain was quite small, and meaning is that lamp current is quite small, and unstable.When therefore system needs light modulation, the adjusting control circuit 135 of light adjusting circuit 13 should switch this switching device 134 by dim signal 102 mutually, make power control circuit 12 improve the frequency that it exchanges output, the electric current of fluorescent tube 18 will lower because of frequency increases gradually this moment, when frequency surpasses a predetermined value, at present embodiment is the 180K hertz, then the powered-down supply.
Please refer to Fig. 3, it is the current waveform schematic diagram of fluorescent tube 18 when light modulation.Period T1 has the characteristic of soft starting when representing fluorescent tube 18 to start; Period T2 represents fluorescent tube 18 in the current waveform in normal when output, and this moment, the fluorescent tube frequency came down to a fixed value, between the 40K hertz between the 80K hertz; On behalf of fluorescent tube 18, period T3 need carry out light modulation, and this moment, the fluorescent tube frequency increased gradually, thus electric current reduce gradually, the interior frequency separation of period T3 between the 40K hertz between the 180K hertz; On behalf of frequency, period T4 surpass a predetermined value, i.e. 180K hertz is so power supply unit is closed fluorescent tube 18 no-outputs at this moment.By the ratio of adjusting T4 and T1, T2 and T3, the output of may command fluorescent tube 18 realizes dimming effect.For example, when T4 is 1 to 4 than T1+T2+T3, then represent the output brightness of fluorescent tube 18 to be adjusted into 80 percent.
The person of noting, the bound in said frequencies interval only for illustrating, is anticipated promptly in other embodiments, and corresponding fluorescent tube is made characteristic, and the bound of frequency separation also can be adjusted thereupon, also can adjust in order to the frequency predetermined value of powered-down supply simultaneously thereupon.Because lamp tube service life and its operating time have positive correlation, so the output of powered-down supply, except that can realizing the light modulation order, but also useful life of prolonging lamp tube.With the foregoing description explanation,, then can be extended for twice ideally the useful life of fluorescent tube 18 if the output brightness of fluorescent tube 18 is adjusted into 50 of percentage.
Please continue with reference to figure 1, in the present embodiment, optical coupler 14 comprises a light-emitting component 141 and a photo detector 142, wherein light-emitting component 141 is coupled to first end points 131 of light adjusting circuit 13,142 of photo detectors are coupled to power control circuit 12, adjusting control circuit 135 corresponding dimming control signal 103 conducting switching devices 134.The suitable conducting that can corresponding switching device 134 of optical coupler 14 produces a coupled signal 104, the frequency that power control circuit 12 corresponding coupled signals 104 will exchange output is increased to aforementioned frequency separation to reduce the current peak that exchanges output gradually, and when frequency surpasses aforementioned predetermined value, be the 180K hertz, the powered-down supply.
Please refer to Fig. 4, is the circuit diagram of light adjusting circuit 13, optical coupler 14 and protective circuit 15.The person of paying special attention to, protective circuit 15 comprises a circuit overcurrent protection 151 and an excess voltage protection 152.Furtherly, dim signal 102 is AC signal, for example a square wave or a pulse signal.135 of adjusting control circuits comprise a comparison circuit 231, in order to a comparison dim signal 102 and a reference value, and should produce dimming control signal 103 by comparative result mutually.Comparison circuit 231 comprises a comparator 232, two resistance 233,234.Wherein resistance 233,234 constitutes a bleeder circuit, is linked to a reference voltage VREF and produces a reference value in an input of comparator 232, and another input of comparator 232 then is connected to dim signal 102.When dim signal 102 during greater than reference value, comparator 232 is promptly exported dimming control signal 103 with conducting switching device 134, the conducting electric current of switching device 134 will drag down the input terminal voltage V1 of comparator 236 by resistance 235 this moment, and then the photo detector 141 of conducting optical coupler 14.
In other embodiments, adjusting control circuit 135 also can be an amplitude detecting circuit, and when the amplitude of dim signal 102 during greater than a reference value, the amplitude of corresponding dim signal 102 produces dimming control signal 103.Be familiar with the personage of this art, can understand the execution mode of amplitude detecting circuit easily, do not repeat them here.
Circuit overcurrent protection 151 comprises resistance 237 and an electric capacity 238; and be linked to an input of comparator 236; when circuit overcurrent protection 151 receives an overcurrent signal 105; will improve the input terminal voltage V2 of comparator 236; and then the photo detector 141 of conducting optical coupler 14; then therefore power supply unit can close, and realizes the protection purpose.
Similarly; excess voltage protection 152 comprises resistance 239 and an electric capacity 240; and be linked to an input of a comparator 241; when excess voltage protection 152 receives an overvoltage signal 106; will improve the input terminal voltage V3 of comparator 241; and then the photo detector 141 of conducting optical coupler 14, then therefore power supply unit can close, and realizes the protection purpose.
Need special instruction person; circuit overcurrent protection 151 is to detect the overpower output situation of power supply unit with the purpose of excess voltage protection 152; order about optical coupler 14 with the output of corresponding power supply unit and produce coupled signal 104; the personage who knows present technique can think easily and other execution modes to realize the identical protection purpose of essence, scope of the present invention is not restriction with the foregoing description.
By above-mentioned explanation as can be known; the present invention can provide has the energy savings prolonging lamp tube light adjusting circuit in useful life; the above embodiments only are used for exemplifying enforcement aspect of the present invention, and explain technical characterictic of the present invention, are not to be used for limiting protection category of the present invention.Any be familiar with this operator can unlabored change or the arrangement of the isotropism scope that all belongs to the present invention and advocated, the scope of the present invention should be as the criterion with the application's claim scope.
Claims (17)
1. a light adjusting circuit is used for one and has the power supply unit that an interchange is exported, and this power supply unit is in order to power supply to a fluorescent tube, and this light adjusting circuit comprises:
One first end points, one second end points and one the 3rd end points;
One switches element, is coupled to this first end points and this second end points, and wherein this first end points is coupled to a power control circuit of this power supply unit, and this second end points is coupled to an earth terminal; And
One adjusting control circuit, be coupled to the 3rd end points and this switching device, wherein the 3rd end points is suitable can receive a dim signal, this adjusting control circuit should produce a dimming control signal by dim signal mutually, this adjusting control circuit should switch this switching device by dimming control signal mutually, this power control circuit mutually should switching device switching will exchange a frequency of exporting and be increased to a frequency separation, and close this power supply unit during above a predetermined value in this frequency.
2. light adjusting circuit according to claim 1 is characterized in that this adjusting control circuit comprises an amplitude detecting circuit, is coupled to the 3rd end points and this switching device, and amplitude that mutually should dim signal produces this dimming control signal.
3. light adjusting circuit according to claim 1, it is characterized in that this adjusting control circuit comprises a comparison circuit, be coupled to the 3rd end points and this switching device,, and should produce this dimming control signal by comparative result mutually in order to relatively this dim signal and a reference value.
4. light adjusting circuit according to claim 1, it is characterized in that this frequency separation between the 40K hertz between the 180K hertz.
5. light adjusting circuit according to claim 1, it is characterized in that also comprising an optical coupler, be coupled to a power control circuit of this first end points and this power supply unit, wherein this adjusting control circuit mutually should this switching device of dimming control signal conducting, this optical coupler suitable can be mutually should switching device conducting produce a coupled signal, this power control circuit mutually should coupled signal will exchange this frequency of exporting and be increased to this frequency separation, and close this power supply unit during above this predetermined value in this frequency.
6. a power supply unit has one and exchanges output with power supply to a fluorescent tube, and this power supply unit comprises:
One energy conversion component comprises a power conversion input and a power conversion output, is coupled to this output of this power supply unit;
One power control circuit comprises a power control circuit and is coupled to this energy conversion component; And
One light adjusting circuit, comprise one and switch an element and an adjusting control circuit, this switching device is coupled to this power control circuit, this adjusting control circuit is coupled to this switching device and receives a dim signal, and should switch this switching device by dim signal mutually, this power control circuit mutually should switching device switching will exchange a frequency of exporting and be increased to a frequency separation, and close this power supply unit during above a predetermined value in this frequency.
7. power supply unit according to claim 6, it is characterized in that also comprising an optical coupler, be coupled to this switching device and this power control circuit, conducting that mutually should switching device produces a coupled signal, this power control circuit mutually should coupled signal will exchange this frequency of exporting and be increased to this frequency separation, and close this power supply unit during above this predetermined value in this frequency.
8. power supply unit according to claim 7 is characterized in that also comprising an overcurrent sensing circuit, is coupled to this output and this optical coupler of this power supply unit, and this output that mutually should power supply unit is ordered about this optical coupler and produced this coupled signal.
9. power supply unit according to claim 7 is characterized in that also comprising an overvoltage detection circuit, is coupled to this output and this optical coupler of this power supply unit, and this output that mutually should power supply unit is ordered about this optical coupler and produced this coupled signal.
10. power supply unit according to claim 6, it is characterized in that this power control circuit be a full-bridge type control circuit, a semibridge system control circuit and a push-pull type control circuit one of them.
11. power supply unit according to claim 6 is characterized in that this adjusting control circuit comprises an amplitude detecting circuit, amplitude that mutually should dim signal produces this dimming control signal.
12. power supply unit according to claim 6 is characterized in that this adjusting control circuit comprises a comparison circuit, in order to relatively this dim signal and a reference value, and should produce this dimming control signal by comparative result mutually.
13. power supply unit according to claim 6, it is characterized in that this frequency separation between the 40K hertz between the 180K hertz.
14. a light-dimming method exchanges output in order to adjust one of a power supply unit, this power supply unit is in order to power supply to a fluorescent tube, and this light-dimming method comprises:
A corresponding dim signal produces a dimming control signal;
Should adjust a frequency of this interchange output between a frequency separation by dimming control signal mutually; And
When this frequency surpasses a predetermined value, close this interchange output of this power supply unit.
15. light-dimming method according to claim 14 is characterized in that mutually should dim signal producing this dimming control signal comprises the amplitude that detects this dim signal, when this amplitude during above a reference value, produces this dim signal.
16. light-dimming method according to claim 14 is characterized in that mutually should dim signal producing this dimming control signal comprises relatively this dimming control signal and a reference value; And when this dimming control signal surpasses this reference value, produce this dimming control signal.
17. light-dimming method according to claim 14, it is characterized in that this frequency separation between the 40K hertz between the 180K hertz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101623226A CN101400206A (en) | 2007-09-27 | 2007-09-27 | Power supply apparatus, light regulating circuit and light regulating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101623226A CN101400206A (en) | 2007-09-27 | 2007-09-27 | Power supply apparatus, light regulating circuit and light regulating method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101400206A true CN101400206A (en) | 2009-04-01 |
Family
ID=40518385
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101623226A Pending CN101400206A (en) | 2007-09-27 | 2007-09-27 | Power supply apparatus, light regulating circuit and light regulating method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101400206A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565721A (en) * | 2010-12-10 | 2012-07-11 | 三星Led株式会社 | System and method for manufacturing power supply unit, and flicker measurement apparatus |
| CN103713571A (en) * | 2013-01-08 | 2014-04-09 | 崇贸科技股份有限公司 | Control device |
-
2007
- 2007-09-27 CN CNA2007101623226A patent/CN101400206A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565721A (en) * | 2010-12-10 | 2012-07-11 | 三星Led株式会社 | System and method for manufacturing power supply unit, and flicker measurement apparatus |
| US8816601B2 (en) | 2010-12-10 | 2014-08-26 | Samsung Electronics Co., Ltd. | System for manufacturing power supply unit and method for manufacturing supply unit, and flicker measurement apparatus |
| CN102565721B (en) * | 2010-12-10 | 2015-01-14 | 三星电子株式会社 | System and method for manufacturing power supply unit, and flicker measurement apparatus |
| CN103713571A (en) * | 2013-01-08 | 2014-04-09 | 崇贸科技股份有限公司 | Control device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101489335B (en) | LED driving circuit and secondary side controller thereof | |
| CN101605413B (en) | LED drive circuit suitable for controlled silicon light adjustment | |
| CN101848577B (en) | LED driving system and driving method | |
| US20110222849A1 (en) | Optical transmission apparatus for visible light communication | |
| CN103298221B (en) | Dimming circuit and method of LED (Light Emitting Diode) lighting lamp | |
| US20130127356A1 (en) | Led driving power supply apparatus and led lighting apparatus | |
| KR101455146B1 (en) | LED dimming converter | |
| US20120126717A1 (en) | Lighting apparatus | |
| CN101861016A (en) | Dimming switch power supply device of LED lamp | |
| CN101502179A (en) | Discharge lamp lighting apparatus | |
| CN103561528A (en) | LED power source platform capable of integrating various dimming ways | |
| CN201349353Y (en) | Double-dimming backlight source drive device | |
| CN201467538U (en) | LED driving circuit for controlled silicon dimming | |
| CN201742607U (en) | LED dimming system | |
| CN101400206A (en) | Power supply apparatus, light regulating circuit and light regulating method | |
| CN115802546B (en) | Dual-mode output dimming power supply | |
| CN103137079A (en) | Constant current driving device of light-emitting diode (LED) backlight module | |
| TWM391707U (en) | Current-sharing backlight driving system with adaptive-control function | |
| CN214481370U (en) | Energy-saving circuit applied to electric sign and electric sign | |
| CN214315691U (en) | Dimming conversion circuit, dimming circuit and lighting equipment | |
| CN110913530B (en) | Dimming LED driver | |
| CN205283887U (en) | LED dimmer circuit and LED drive circuit | |
| CN209767879U (en) | PCB compatible with multi-mode constant-current dimming circuit | |
| CN216929590U (en) | Two-wire power supply control circuit with variable direct-current voltage | |
| CN217693774U (en) | Voice-controlled fishing lamp circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20090401 |