CN104023428A - Light modulator used for voltage drop dimming light fixture - Google Patents
Light modulator used for voltage drop dimming light fixture Download PDFInfo
- Publication number
- CN104023428A CN104023428A CN201310085050.XA CN201310085050A CN104023428A CN 104023428 A CN104023428 A CN 104023428A CN 201310085050 A CN201310085050 A CN 201310085050A CN 104023428 A CN104023428 A CN 104023428A
- Authority
- CN
- China
- Prior art keywords
- circuit
- voltage
- dimmer
- power factor
- voltage range
- 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
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
A light modulator used for a voltage drop dimming light fixture comprises a power factor correction circuit, a DC/DC voltage reduction circuit which is electrically connected with the power factor correction circuit, a half-bridge driving circuit which is electrically connected with the DC/DC voltage reduction circuit, and a filter circuit which is electrically connected with the half-bridge driving circuit. The power factor correction circuit converts an input voltage into a high-voltage direct current. The half-bridge driving circuit converts the direct current into a square wave. The light modulator uses function modules of the power factor correction circuit, the DC/DC voltage reduction circuit, the half-bridge driving circuit, the filter circuit and the like to adjust voltage amplitude so as to achieve a light modulation purpose. Waveform jump is not caused since the light modulator does not cut the voltage waveform like a front and back phase-cutting light modulator, so that the output waveform of the light modulator is still the continuous waveform, a load light fixture can pass a harmonic wave test, and the quality of the whole light fixture is improved.
Description
Technical field
The present invention relates to a kind of lighting apparatus, particularly a kind of dimmer for voltage range of decrease dimming lamp.
Background technology
Traditional light fixture adopts Halogen lamp LED as electric light source conventionally.Halogen lamp LED power consumption is large, and temperature is high, is unfavorable for energy-conservation.Along with the development of LED technology, it is found that LED is one of at present best lighting source, the advantages such as luminosity is high, long service life that it has.LED has been widely used in illuminating lamp as light source.Along with the raising of people's living standard, comprise that inhabitation, building, business etc. more and more bring into use some light fixtures for throwing light on, particularly need the light fixture of a kind of LED of use lamp as light source, to save the energy and to increase lamp life.
Along with the demand in market, and energy level regulation, tunable optical, high PF, high efficiency LED driver arises at the historic moment, but the LED drive unit of the tunable optical on market, dimmer mostly is two kinds of front cut and rear cuts.And because electronic product uses more Switching Power Supply as LED lamp interior, in improving power utilization efficiency, due to nonlinear electric energy conversion, can in electrical network, inject a large amount of harmonic currents, it not only can disturb other equipment in same electrical network, also can make the current in middle wire overload of electrical network, affect ability to transmit electricity.In addition, also can cause that to the phase control of power supply electrical network effective value electric current changes, cause the effective value voltage of load-side to produce fluctuation, cause the light flash of lighting, therefore, must carry out harmonic wave test to used light fixture, its be also improve light fixture quality must be through one of approach.If Fig. 1 is the comparison diagram of front cut or the rear voltage oscillogram of phase-cut dimming device and the voltage oscillogram of civil power.In front and back phase-cut dimming device output voltage waveform in Fig. 1, dotted line is expressed as the part cutting, as can be seen from Figure 1, for front cut or rear phase-cut dimming device, its be by each waveform is cut number regulate by the size of the voltage of load, thereby reach the object of light modulation.Also can find out from Fig. 1, because front and back phase-cut dimming device cuts a part by the continuous shaping ripple of civil power according to needed brightness, the output waveform that makes this front and back phase-cut dimming device is no longer the shaping ripple connecting, but the spacing wave of great-jump-forward, thereby the major defect that causes this front and back phase-cut dimming device is to affect power grid quality, while particularly use on a large scale, because the stack of waveform makes electric network influencing quite large.In the time that the LED power supply of this front and back phase-cut dimming device and tunable optical or light modulating energy-saving lamp group are electrically connected, the LED lamp or the light modulating energy-saving lamp group that are connected with this LED power supply will be difficult to test by light fixture harmonic wave.
Summary of the invention
In view of this, be necessary to provide a kind of dimmer for voltage range of decrease dimming lamp that can allow LED lamp or desk lamp with dimmer switch group test by light fixture harmonic wave.
A kind of dimmer for voltage range of decrease dimming lamp, it comprises a circuit of power factor correction, a DC/DC reduction voltage circuit being electrically connected with this circuit of power factor correction, a half-bridge drive circuit being electrically connected with this DC/DC reduction voltage circuit, and a filter circuit being electrically connected with this half-bridge drive circuit.Described circuit of power factor correction makes input voltage be converted to high voltage direct current, the square wave that described half-bridge drive circuit is converted into direct current, and this filter circuit makes the square wave of half-bridge drive circuit output change into sinusoidal and is described voltage range of decrease dimming lamp power supply.
Compared with prior art, this dimmer that is used for voltage range of decrease dimming lamp utilizes the functional modules such as described circuit of power factor correction, DC/DC reduction voltage circuit, half-bridge drive circuit, filter circuit to adjust the amplitude of voltage, but owing to not causing waveform to jump to voltage waveform cutting as the phase-cut dimming device of front and back, the output waveform of this dimmer remains continuous waveform, thereby can make load light fixture to test by harmonic wave, and then the quality of whole light fixture is provided.
Brief description of the drawings
Below in conjunction with accompanying drawing, embodiments of the invention are described, wherein:
Fig. 1 is the comparison diagram of front cut or the rear voltage oscillogram of phase-cut dimming device and the voltage oscillogram of civil power.
Fig. 2 is the schematic block circuit diagram of a kind of dimmer for voltage range of decrease dimming lamp provided by the present invention.
Fig. 3 A-3G is that the dimmer for voltage range of decrease dimming lamp of Fig. 2 is in each functional unit oscillogram after treatment.
Embodiment
Based on accompanying drawing, specific embodiments of the invention are further elaborated below.Should be appreciated that specific embodiment described herein is only as embodiment, the protection range being not intended to limit the present invention.
Refer to Fig. 1 and Fig. 2, it is the schematic block circuit diagram of a kind of dimmer 100 for voltage range of decrease dimming lamp provided by the present invention.Described dimmer 100 comprises a power supply 10, a rectification circuit 11 being electrically connected with this power supply 10, a circuit of power factor correction 12 being electrically connected with the output of described rectification circuit 11, a DC/DC reduction voltage circuit 13 being electrically connected with the output of this circuit of power factor correction 12, a half-bridge drive circuit 14 being electrically connected with the output of this DC/DC reduction voltage circuit 13, a filter circuit 15 being electrically connected with this half-bridge drive circuit 14, a block capacitor 16 being arranged between described half-bridge drive circuit 14 and filter circuit 15, a sampling feedback circuit 17 being electrically connected with the output of described filter circuit 15, a microprocessor 18 being electrically connected with the output of described sampling feedback circuit 17, one provides the control inputs unit 19 of input for described microprocessor 18.The output of described microprocessor 17 and DC/DC reduction voltage circuit 13 are electrically connected to provide control signal to described DC/DC reduction voltage circuit 13 with half-bridge drive circuit 14 with half-bridge drive circuit 14.Need to further illustrate, the load of described dimmer 100 is electrically connected at the output of described filter circuit 15.Described load can be incandescent lamp, Halogen lamp LED, or includes the LED light fixture of driving power.
Described power supply 10 can be the alternating currents such as civil power, generating set, the direct currents such as storage battery etc., it is set as required, in the present embodiment, the alternating currents such as described power supply 10 is civil power, be the voltage oscillogram of this power supply 10 as shown in Figure 3A, it is a sine wave that those skilled in the art are familiar, and the operation principle of this dimmer 100 is described as an example of 220 volts of voltages example in the present embodiment.
Described rectification circuit 11 is electrically connected between power supply 10 and circuit of power factor correction 12, and it can be a kind of bridge rectifier, and it utilizes the unidirectional general character of diode to carry out the circuit of rectification, to change alternating current into direct current.Bridge rectifier utilizes four diodes, and docking between two.In the time of just half part of input sine wave, two conductings in described four diodes, thus export half positive sine wave.In the time of negative half part of input sine wave, another two conductings in described four diodes.Because this two is reversal connection by all means, so output will be also sinusoidal wave just half part, thereby can reduce electric quantity loss, be the voltage oscillogram after rectification circuit 11 rectifications as shown in Figure 3 B, it is an approximate straight line." be similar to " although the meaning be the rectification through this rectification circuit 11, this straight line still has and is similar to sinusoidal wave fluctuation, because rectification circuit can not become absolute direct current by sinusoidal wave interchange.
Described circuit of power factor correction 12 is for adjusting the output of whole dimmer 100.Power factor refers to the relation between effective power and total power consumption (apparent power), and namely effective power is divided by the ratio of total power consumption (apparent power).Substantially power factor (PF) can be weighed the degree that electric power is used effectively, and when power factor (PF) value is larger, represents that its electric power utilance is higher.Therefore,, in order to improve the capability correction factor of power supply, general all power supplys all installation power factor correcting circuit, to improve the conversion efficiency of power supply, therefore it is prior art, repeat no more.Be understandable that, in the time that power factor is 1, the magnitude of voltage of the input and output of described circuit of power factor correction 12 is by identical, and in the time that power factor is less than 1, the magnitude of voltage of the output of this circuit of power factor correction 12 will be less than the magnitude of voltage of input.For the dimmer 100 in the present invention, the power factor of described circuit of power factor correction 12 is more than or equal to 0.90, makes input voltage be converted to low-voltage DC, meets load request with the function that ensures this dimmer 100.If Fig. 3 C is the voltage oscillogram after circuit of power factor correction 12 is proofreaied and correct.
Described DC/DC reduction voltage circuit 13 can be a kind of switching power source chip, it utilizes the characteristic of the energy storage of electric capacity, inductance, carry out the action of HF switch by gate-controlled switch (MOSFET etc.), by inner at electric capacity (sense) electrical power storage of input, in the time that switch disconnects, electric energy discharges to load again, and energy is provided.The power of its output or the ability of voltage and duty ratio (by the ratio in cycle of switch conduction time and whole switch) are relevant.This DC/DC change-over circuit 13 can be for boosting and step-down, in the time that dimmer 100 is adjusted size of current, these DC/DC change-over circuit 10 direct-detections are less than the adjustment of this dimmer 10, thereby be also difficult to control the size of its output current, and then can not control the size of the input current of LED lamp, make to control the brightness of LED lamp.Therefore need to join the output that sample feedback circuit 16 and microprocessor 17 detect dimmer 100, and then according to the size of this output voltage values, the output voltage values of DC/DC reduction voltage circuit 13 is adjusted, in the present embodiment, described DC/DC change-over circuit 13 is Buck conversion circuit, and magnitude of voltage will be arrived to an arbitrary value, be made as X.If Fig. 3 D is the voltage oscillogram after 13 step-downs of DC/DC reduction voltage circuit, it is the straight line that an amplitude is less than or equal to circuit of power factor correction 12 output voltage amplitudes.
Described half-bridge drive circuit 14 becomes alternating current again for the direct current that DC/DC reduction voltage circuit 13 is exported.This half-bridge drive circuit 14 can be converted into the square wave that frequency is 50Hz or 60Hz direct current, and the output high level of the square wave changing into is direct voltage simultaneously, and this high level amplitude is X, and output low level is 0V.As Fig. 3 E be as described in voltage oscillogram after half-bridge drive circuit 14.
Described block capacitor 16 carries out phase shift for the square wave that half-bridge drive circuit 14 is converted to formation, makes the equal and opposite in direction of the positive and negative amplitude of this voltage square wave.Through the adjustment of this block capacitor 16, the size of the positive and negative amplitude of the voltage method of exporting is all the half of the output high level of half-bridge drive circuit 14, i.e. X/2, as Fig. 3 F be as described in block capacitor 16 voltage square wave oscillogram after treatment.
The ac square-wave voltage that described filter circuit 15 is used for half-bridge drive circuit 14 to export becomes sine voltage.Through the processing of described filter circuit 15, become the operable voltage of described load, in the time that load is incandescent lamp or Halogen lamp LED, can directly uses, and in the time that load is LED lamp, need to be electrically connected a power supply driver, then connect this LED lamp.The effect of this power supply driver is that again the alternating current that this filter circuit 15 is exported is transformed to direct current.If Fig. 3 G is the voltage oscillogram after filter circuit 15 conversion.
Described sampling feedback circuit 17 is for detection of the output voltage amplitude size of filter circuit 15, and forms the signal of telecommunication, inputs to microprocessor 18, so that user is according to this amplitude and needs, the output voltage amplitude of filter circuit 15 need to be heightened or turn down to decision.
Described microprocessor 18 can have for single-chip microcomputer or CPU etc. the unit of data processing function, and it adjusts the output of DC/DC reduction voltage circuit 13 and half-bridge drive circuit 14 according to sampling meal circuit 17 and the input of control inputs unit 19.
The brightness of the light that described control inputs unit 19 sends according to required light fixture for user is described microprocessor 18 input control signals, to regulate luminous intensity or the brightness of light fixture.This control inputs unit 19 can be potentiometer or switch, and in the present embodiment, described control inputs unit 19 is potentiometer.
Also it should be noted that, each unit modules such as described power supply 10, rectification circuit 11, circuit of power factor correction 12, DC/DC reduction voltage circuit 13, half-bridge drive circuit 14, filter circuit 15, block capacitor 16, sampling feedback circuit 17, microprocessor 18, control inputs unit 19 are all prior art, its concrete circuit being made up of each components and parts is known by those skilled in the art, does not repeat them here.
Compared with prior art, this dimmer 100 that is used for voltage range of decrease dimming lamp is for described circuit of power factor correction 12, DC/DC reduction voltage circuit 13, half-bridge drive circuit 14, filter circuit 15, block capacitor 16 and sampling feedback circuit 17, microprocessor 18, the effect of the functional modules such as control inputs unit 19, can play the effect of adjusting output voltage amplitude, simultaneously owing to not causing waveform to jump to voltage waveform cutting as the phase-cut dimming device of front and back, this dimmer 100 remains continuous waveform, thereby can make load light fixture to test by harmonic wave, and then provide the quality of whole light fixture.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all interior done any amendments in the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included in protection scope of the present invention in.
Claims (10)
1. the dimmer for voltage range of decrease dimming lamp, it is characterized in that: this dimmer comprises a circuit of power factor correction, a DC/DC reduction voltage circuit being electrically connected with this circuit of power factor correction, a half-bridge drive circuit being electrically connected with this DC/DC reduction voltage circuit, an and filter circuit being electrically connected with this half-bridge drive circuit, described circuit of power factor correction makes input voltage be converted to high voltage direct current, the square wave that described half-bridge drive circuit is converted into direct current, this filter circuit makes the square wave of half-bridge drive circuit output change into sinusoidal wave and is described voltage range of decrease dimming lamp power supply.
2. the dimmer for voltage range of decrease dimming lamp as claimed in claim 1, is characterized in that: described dimmer also comprises a power supply and a rectification circuit, and this rectification circuit is electrically connected between power supply and circuit of power factor correction.
3. the dimmer for voltage range of decrease dimming lamp as claimed in claim 1, it is characterized in that: described dimmer also comprises a sampling feedback circuit and a microprocessor, described sampling feedback circuit and filter circuit are electrically connected, described microprocessor is connected with the output electric property of sampling feedback circuit, and the output of microprocessor and described DC/DC reduction voltage circuit and half-bridge drive circuit are electrical connected.
4. the dimmer for voltage range of decrease dimming lamp as claimed in claim 3, is characterized in that: described dimmer also comprises a control inputs unit, and this control inputs unit is described microprocessor input control signal.
5. the dimmer for voltage range of decrease dimming lamp as claimed in claim 3, is characterized in that: described microprocessor is single-chip microcomputer or CPU.
6. the dimmer for voltage range of decrease dimming lamp as claimed in claim 4, is characterized in that: described control inputs unit is potentiometer or switch.
7. the dimmer for voltage range of decrease dimming lamp as claimed in claim 1, is characterized in that: described DC/DC reduction voltage circuit is Buck conversion circuit.
8. the dimmer for voltage range of decrease dimming lamp as claimed in claim 1, is characterized in that: described half-bridge drive circuit output high level is direct voltage, and low level is 0V.
9. the dimmer for voltage range of decrease dimming lamp as claimed in claim 1, is characterized in that: the power factor of described circuit of power factor correction is more than or equal to 0.90.
10. the dimmer for voltage range of decrease dimming lamp as claimed in claim 1, is characterized in that: the frequency of the described alternating current transforming through half-bridge drive circuit is 50Hz or 60Hz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310085050.XA CN104023428A (en) | 2013-02-28 | 2013-02-28 | Light modulator used for voltage drop dimming light fixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310085050.XA CN104023428A (en) | 2013-02-28 | 2013-02-28 | Light modulator used for voltage drop dimming light fixture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104023428A true CN104023428A (en) | 2014-09-03 |
Family
ID=51439940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310085050.XA Pending CN104023428A (en) | 2013-02-28 | 2013-02-28 | Light modulator used for voltage drop dimming light fixture |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104023428A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104486863A (en) * | 2014-11-17 | 2015-04-01 | 河北农业大学 | Flat plate type electrodeless remote control dimming LED plant light supplement lamp |
| CN108925004A (en) * | 2018-08-08 | 2018-11-30 | 深圳世鸿智汇科技有限公司 | LED drive system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1642380A (en) * | 2004-12-29 | 2005-07-20 | 浙江大学 | Electronic ballast and method for selecting its working frequency |
| US7429833B2 (en) * | 2006-05-16 | 2008-09-30 | Junzhong Peng | Power-saving and stabilizing ballast |
| CN101702863A (en) * | 2009-11-25 | 2010-05-05 | 中国电子科技集团公司第五十二研究所 | Frequency-modulation electronic ballast for dimmable fluorescent lamp |
| WO2012170137A1 (en) * | 2011-06-07 | 2012-12-13 | Osram Sylvania Inc. | Dimming ballast for electrodeless lamp |
| CN202652674U (en) * | 2012-05-07 | 2013-01-02 | 广州辉鸿灯光器材有限公司 | Big power low frequency power supply |
| CN203181303U (en) * | 2013-02-28 | 2013-09-04 | 林万炯 | Light modulator used for voltage drop dimming light fixture |
-
2013
- 2013-02-28 CN CN201310085050.XA patent/CN104023428A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1642380A (en) * | 2004-12-29 | 2005-07-20 | 浙江大学 | Electronic ballast and method for selecting its working frequency |
| US7429833B2 (en) * | 2006-05-16 | 2008-09-30 | Junzhong Peng | Power-saving and stabilizing ballast |
| CN101702863A (en) * | 2009-11-25 | 2010-05-05 | 中国电子科技集团公司第五十二研究所 | Frequency-modulation electronic ballast for dimmable fluorescent lamp |
| WO2012170137A1 (en) * | 2011-06-07 | 2012-12-13 | Osram Sylvania Inc. | Dimming ballast for electrodeless lamp |
| CN202652674U (en) * | 2012-05-07 | 2013-01-02 | 广州辉鸿灯光器材有限公司 | Big power low frequency power supply |
| CN203181303U (en) * | 2013-02-28 | 2013-09-04 | 林万炯 | Light modulator used for voltage drop dimming light fixture |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104486863A (en) * | 2014-11-17 | 2015-04-01 | 河北农业大学 | Flat plate type electrodeless remote control dimming LED plant light supplement lamp |
| CN108925004A (en) * | 2018-08-08 | 2018-11-30 | 深圳世鸿智汇科技有限公司 | LED drive system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102065600B (en) | LED dimming driving system | |
| CN102695330B (en) | Light emitting device power supply circuit, and light emitting device driver circuit and control method thereof | |
| CN100576965C (en) | Led drive circuit and control method | |
| EP2676528B1 (en) | A dimmable led driver and a method for controlling the same | |
| CN102186291B (en) | Driving circuit structure | |
| CN102099621A (en) | LED lamp | |
| EP2805575A1 (en) | Secondary side phase-cut dimming angle detection | |
| CN103098547A (en) | Circuit assembly and method for operating at least one LED | |
| CN103369802A (en) | Design method of LED (light-emitting diode) dimming driving switching power supply applied to various traditional dimmers | |
| CN104427688A (en) | LED alternating current driving circuit | |
| EP2903396A1 (en) | Secondary side phase-cut dimming angle detection | |
| CN101626652A (en) | Dimmable LED constant current source driver with wide voltage range | |
| CN105009690A (en) | Output current compensation for jitter in input voltage for dimmable led lamps | |
| CN102612204B (en) | Light emitting diode driving circuit | |
| CN203181303U (en) | Light modulator used for voltage drop dimming light fixture | |
| CN205726501U (en) | A kind of LED adjusting control circuit | |
| CN103369797B (en) | Light adjustment device and method of LED (Light Emitting Diode) high-voltage direct current centralized power supply system | |
| CN205961510U (en) | LED light modulator and LED drive arrangement | |
| CN205961512U (en) | LED light modulator and LED drive arrangement | |
| CN104023428A (en) | Light modulator used for voltage drop dimming light fixture | |
| CN102045911B (en) | Light source regulation circuit for alternating current light-emitting diode | |
| CN103139991A (en) | Light-adjustable light-emitting diode (LED) drive circuit | |
| CN211046756U (en) | PFC circuit | |
| CN207911069U (en) | Constant current output high pressure dimming driver | |
| CN103052222A (en) | 220V light-dimmable constant-current drive high-voltage LED (Light Emitting Diode) 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 | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140903 |