CN203181303U - Light modulator used for voltage drop dimming light fixture - Google Patents
Light modulator used for voltage drop dimming light fixture Download PDFInfo
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- CN203181303U CN203181303U CN 201320145617 CN201320145617U CN203181303U CN 203181303 U CN203181303 U CN 203181303U CN 201320145617 CN201320145617 CN 201320145617 CN 201320145617 U CN201320145617 U CN 201320145617U CN 203181303 U CN203181303 U CN 203181303U
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- dimmer
- power factor
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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 a voltage amplitude so as to achieve a light modulation purpose. A before and after cutting phase light modulator is used to cut a voltage waveform. The light modulator of the utility model does not cut the voltage waveform like the before and after cutting phase 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 so that the quality of the whole light fixture is improved.
Description
Technical field
The utility model 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 usually.Halogen lamp LED power consumption is big, and the temperature height, 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, it has advantages such as luminosity height, long service life.LED has been widely used in illuminating lamp as light source.Along with the raising of people's living standard, comprise the light fixture that inhabitation, building, commerce etc. more and more bring into use some to be used to throw light on, particularly need a kind of LED of use lamp as the light fixture of light source, to save the energy and to increase lamp life.
Along with the demand in market, and the energy level regulation, tunable optical, high PF, the high-efficiency LED driver arises at the historic moment, but the LED drive unit of the tunable optical on the market, cut and back cut were two kinds before namely dimmer mostly was.And because electronic product such as LED lamp interior are used more Switching Power Supply, when improving power utilization efficient, because nonlinear electric energy conversion, can in electrical network, inject a large amount of harmonic currents, it not only can disturb other equipment in the same electrical network, also can make the current in middle wire overload of electrical network, influence ability to transmit electricity.In addition, can cause also 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 employed light fixture, its also be improve the light fixture quality must be through one of approach.Be the comparison diagram of the voltage oscillogram of the voltage oscillogram of preceding cut or back phase-cut dimming device and civil power as Fig. 1.Dotted line is expressed as the part that cuts in the front and back phase-cut dimming device output voltage waveform in Fig. 1, as can be seen from Figure 1, for preceding cut or back phase-cut dimming device, it is what that each waveform is cut to regulate size by the voltage of load by, thereby reaches the purpose of light modulation.Also can find out from Fig. 1, because front and back phase-cut dimming device cuts a part with the continuous shaping ripple of civil power according to needed brightness, make that the output waveform of this front and back phase-cut dimming device no longer is the shaping ripple that connects, but the spacing wave of great-jump-forward, thereby the major defect that causes this front and back phase-cut dimming device is to influence power grid quality, when particularly using on a large scale, because the stack of waveform is feasible quite big to electric network influencing.When the LED power supply of this front and back phase-cut dimming device and tunable optical or light modulating energy-saving lamp group electrically connect, the LED lamp that is connected with this LED power supply or light modulating energy-saving lamp group will be difficult to test by the light fixture harmonic wave.
The utility model content
In view of this, be necessary to provide a kind of dimmer that is used for voltage range of decrease dimming lamp that can allow LED lamp or desk lamp with dimmer switch group test by the 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 that electrically connects with this circuit of power factor correction, a half-bridge drive circuit that electrically connects with this DC/DC reduction voltage circuit, and a filter circuit that electrically connects with this half-bridge drive circuit.Described circuit of power factor correction makes input voltage be converted to high voltage direct current, and described half-bridge drive circuit is converted into square wave with 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, the dimmer that should be used for voltage range of decrease dimming lamp utilizes functional modules such as described circuit of power factor correction, DC/DC reduction voltage circuit, half-bridge drive circuit, filter circuit that the amplitude of voltage is adjusted, but owing to as the phase-cut dimming device of front and back, not causing waveform to jump to voltage waveform cutting, namely the output waveform of this dimmer remains continuous waveform, thereby can and then provide the quality of whole light fixture so that the load lamp tool can be tested by harmonic wave.
Description of drawings
Below in conjunction with accompanying drawing embodiment of the present utility model is described, wherein:
Fig. 1 is the comparison diagram of the voltage oscillogram of the voltage oscillogram of preceding cut or back phase-cut dimming device and 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 utility model.
Fig. 3 A-3G is the oscillogram of the dimmer that is used for voltage range of decrease dimming lamp after each functional unit is handled of Fig. 2.
Embodiment
Below based on accompanying drawing specific embodiment of the utility model is further elaborated.Should be appreciated that specific embodiment described herein only as embodiment, and be not used in restriction protection range of the present utility model.
See also 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 utility model.Described dimmer 100 comprises a power supply 10, a rectification circuit 11 that electrically connects with this power supply 10, a circuit of power factor correction 12 that electrically connects with the output of described rectification circuit 11, a DC/DC reduction voltage circuit 13 that electrically connects with the output of this circuit of power factor correction 12, a half-bridge drive circuit 14 that electrically connects with the output of this DC/DC reduction voltage circuit 13, a filter circuit 15 that electrically connects with this half-bridge drive circuit 14, a block capacitor 16 that is arranged between described half-bridge drive circuit 14 and the filter circuit 15, a sampling feedback circuit 17 that electrically connects with the output of described filter circuit 15,18, one the control input units 19 that input is provided for described microprocessor 18 of microprocessor that electrically connect with the output of described sampling feedback circuit 17.The output of described microprocessor 17 and DC/DC reduction voltage circuit 13 electrically connect to provide control signal with half-bridge drive circuit 14 for described DC/DC reduction voltage circuit 13 with half-bridge drive circuit 14.What need further specify is that 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, perhaps includes the LED light fixture of driving power.
Described power supply 10 can be alternating currents such as civil power, generating set, direct currents such as storage battery etc., it is set as required, in the present embodiment, described power supply 10 is alternating currents such as 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 were familiar with, and is the operation principle that example illustrates this dimmer 100 with 220 volts of voltages in the present embodiment.
Described rectification circuit 11 is electrically connected between power supply 10 and the circuit of power factor correction 12, and it can be a kind of bridge rectifier, and the circuit that it utilizes the unidirectional conduction of diode to carry out rectification is to change alternating current into direct current.Bridge rectifier utilizes four diodes, and butt joint in twos.When just half part of input sine wave, two conductings in described four diodes, thus export half positive sine wave.When negative half part of input sine wave, two conductings in addition in described four diodes.Because this two is reversal connection by all means, so output also will be sinusoidal wave just half part, thereby can reduce electric quantity loss, be depicted as voltage oscillogram after rectification circuit 11 rectifications as Fig. 3 B, it is an approximate straight line." be similar to " though the meaning be rectification through this rectification circuit 11, this straight line still has and is similar to sinusoidal wave fluctuation, because rectification circuit can not become the interchange of sine wave absolute direct current.
Described circuit of power factor correction 12 is used for adjusting the output of whole dimmer 100.Power factor refers to the relation between effective power and the total power consumption (apparent power), and just effective power is divided by the ratio of total power consumption (apparent power).Basically power factor (PF) can be weighed the degree that electric power is used effectively, and when the power factor (PF) value is more big, it is more high to represent its electric power utilance.Therefore, in order to improve the capability correction factor of power supply, general all power supplys all installation power factor correcting circuit, repeat no more so it is prior art to improve the conversion efficiency of power supply.Be understandable that when power factor was 1, the magnitude of voltage of the input and output of described circuit of power factor correction 12 was identical, when power factor less than 1 the time, 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 utility model, the power factor of described circuit of power factor correction 12 makes input voltage be converted to low-voltage DC more than or equal to 0.90, meets load request with the function that guarantees this dimmer 100.Be voltage oscillogram after circuit of power factor correction 12 is proofreaied and correct as Fig. 3 C.
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, (MOSFET etc.) carry out the action of HF switch by gate-controlled switch, with the input electrical power storage in electric capacity (sense) lining, when 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 used for boosting and step-down, when 100 pairs of size of current of dimmer are adjusted, this DC/DC change-over circuit 10 directly detects the adjustment less than this dimmer 10, thereby also be difficult to the size of its output current of control, and then can not control the size of the input current of LED lamp, make the brightness that can not control the LED lamp.Therefore need connection sample feedback circuit 16 and microprocessor 17 to detect the output of 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 the buck translation circuit, and magnitude of voltage will be arrived an arbitrary value, be made as X.Be voltage oscillogram after 13 step-downs of DC/DC reduction voltage circuit as Fig. 3 D, 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 is used for the direct current of DC/DC reduction voltage circuit 13 outputs is become alternating current again.This half-bridge drive circuit 14 can be converted into the square wave that frequency is 50Hz or 60Hz to direct current, and the output high level of the square wave that changes into simultaneously is direct voltage, and this high level amplitude is X, and output low level is 0V.Voltage oscillogram as described in as Fig. 3 E being behind the half-bridge drive circuit 14.
Described block capacitor 16 is used for the square wave that half-bridge drive circuit 14 conversion form is carried out phase shift, 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 half of output high level of half-bridge drive circuit 14, i.e. X/2, as Fig. 3 F be as described in the voltage square wave oscillogram of block capacitor 16 after handling.
Described filter circuit 15 is used for the ac square-wave voltage of half-bridge drive circuit 14 outputs is become sine voltage.Processing through described filter circuit 15 becomes the operable voltage of described load, when load is incandescent lamp or Halogen lamp LED, then can directly uses, and when load is the LED lamp, then need to electrically connect a power supply driver, connects this LED lamp again.The effect of this power supply driver is that again the alternating current of these filter circuit 15 outputs is transformed to direct current.Be voltage oscillogram after filter circuit 15 conversion as Fig. 3 G.
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 the user is according to this amplitude and needs, the output voltage amplitude of filter circuit 15 need be heightened or turn down to decision.
Described microprocessor 18 can have the unit of data processing function for single-chip microcomputer or CPU etc., 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 input unit 19.
The brightness that described control input unit 19 is used for the light that the user sends according to required light fixture is described microprocessor 18 input control signals, to regulate luminous intensity or the brightness of light fixture.This control input unit 19 can be potentiometer or switch, and in the present embodiment, described control input unit 19 is potentiometer.
Also need to prove, each unit module 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 input unit 19 is all prior art, its concrete circuit of 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, the dimmer 100 that should be used for voltage range of decrease dimming lamp is used 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 functional modules such as control input unit 19, namely can play the effect of adjusting output voltage amplitude, simultaneously owing to as the phase-cut dimming device of front and back, not causing waveform to jump to voltage waveform cutting, this dimmer 100 remains continuous waveform, thereby can and then provide the quality of whole light fixture so that the load lamp tool can be tested by harmonic wave.
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all interior any modifications of doing in spirit of the present utility model and principle, be equal to and replace and improvement etc., all should be included in protection range of the present utility model in.
Claims (10)
1. dimmer that is used 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 that electrically connects with this circuit of power factor correction, a half-bridge drive circuit that electrically connects with this DC/DC reduction voltage circuit, and filter circuit that electrically connects with this half-bridge drive circuit, described circuit of power factor correction makes input voltage be converted to high voltage direct current, described half-bridge drive circuit is converted into square wave with direct current, and 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, it 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 the 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 electrically connect, described microprocessor links to each other 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 input unit, and this control input unit is described microprocessor input control signal.
5. the dimmer for voltage range of decrease dimming lamp as claimed in claim 3, it 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, it is characterized in that: described control input unit is potentiometer or switch.
7. the dimmer for voltage range of decrease dimming lamp as claimed in claim 1, it is characterized in that: described DC/DC reduction voltage circuit is the buck translation 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, it 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 that transforms through half-bridge drive circuit is 50Hz or 60Hz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320145617 CN203181303U (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 |
|---|---|---|---|
| CN 201320145617 CN203181303U (en) | 2013-02-28 | 2013-02-28 | Light modulator used for voltage drop dimming light fixture |
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| Publication Number | Publication Date |
|---|---|
| CN203181303U true CN203181303U (en) | 2013-09-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320145617 Expired - Lifetime CN203181303U (en) | 2013-02-28 | 2013-02-28 | Light modulator used for voltage drop dimming light fixture |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104023428A (en) * | 2013-02-28 | 2014-09-03 | 林万炯 | Light modulator used for voltage drop dimming light fixture |
| WO2015196443A1 (en) * | 2014-06-27 | 2015-12-30 | 东莞华明灯具有限公司 | Phase-cut dimming circuit for led light |
| CN105546363A (en) * | 2014-10-21 | 2016-05-04 | 三星电子株式会社 | Light emitting device |
| CN108925004A (en) * | 2018-08-08 | 2018-11-30 | 深圳世鸿智汇科技有限公司 | LED drive system |
-
2013
- 2013-02-28 CN CN 201320145617 patent/CN203181303U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104023428A (en) * | 2013-02-28 | 2014-09-03 | 林万炯 | Light modulator used for voltage drop dimming light fixture |
| WO2015196443A1 (en) * | 2014-06-27 | 2015-12-30 | 东莞华明灯具有限公司 | Phase-cut dimming circuit for led light |
| CN105546363A (en) * | 2014-10-21 | 2016-05-04 | 三星电子株式会社 | Light emitting device |
| CN105546363B (en) * | 2014-10-21 | 2020-10-30 | 三星电子株式会社 | Light emitting device |
| CN108925004A (en) * | 2018-08-08 | 2018-11-30 | 深圳世鸿智汇科技有限公司 | LED drive system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: NINGBO HI. TECH. PARK SELF ELECTRONICS CO., LTD. Free format text: FORMER OWNER: LIN WANJIONG Effective date: 20140424 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20140424 Address after: The national high tech Zone Juxian 315103 Ningbo Road, Zhejiang province No. 1345 Patentee after: Self Electronics Co.,Ltd. Address before: The national high tech Zone Juxian 315103 Ningbo Road, Zhejiang province No. 1345 Ningbo Purcell Electronics Ltd. Patentee before: Lin Wanjiong |
|
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: The national high tech Zone Juxian 315103 Ningbo Road, Zhejiang province No. 1345 Patentee after: Self Electronics Co.,Ltd. Address before: The national high tech Zone Juxian 315103 Ningbo Road, Zhejiang province No. 1345 Patentee before: SELF ELECTRONICS CO.,LTD. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20130904 |
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| CX01 | Expiry of patent term |