CN101998745A - PWM/PFM synchronous control dimming circuit - Google Patents
PWM/PFM synchronous control dimming circuit Download PDFInfo
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- CN101998745A CN101998745A CN2009100566352A CN200910056635A CN101998745A CN 101998745 A CN101998745 A CN 101998745A CN 2009100566352 A CN2009100566352 A CN 2009100566352A CN 200910056635 A CN200910056635 A CN 200910056635A CN 101998745 A CN101998745 A CN 101998745A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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Abstract
The invention discloses a PWM/PFM synchronous control dimming circuit, comprising a power supply circuit, a PWM generating circuit, a PWM control circuit, an OSC circuit, a PFM control circuit, a PWM/PEFM synchronous control circuit, a function control circuit and a drive circuit. Linearly changing adjustable circuits of impulse width and impulse frequency are generated synchronously in proportion according to the change requirements of control signals so as to control a dimming control circuit in which the loading reaches to the adjusting power through the drive circuit; and the dimming circuit can be applied to dimming gas discharge lamps such as fluorescent light, high voltage sodium lamp, Metal halogen lamp, and the like, and is applied to electronic field and microelectronic field.
Description
Technical field
The invention belongs to high-frequency impulse electronics and integrated micro technical field, relate to a kind of gaseous discharge lamp light adjusting circuit, be specifically related to a kind of PWM/PFM Synchronization Control light adjusting circuit.
Technical background
Green illumination is one of high-technology field of the tool development prospect of two Pius XIs circle; green illumination is not only traditional energy-conservation and increase economic efficiency; the more important thing is and have resource rational utilization and environmental protection in mind, in the requirements at the higher level that satisfy under lighting quality and the visual environment condition.
Light regulating technology has in incandescent lamp more widely to be used, and can adopt the scheme of pressure regulation.Incandescent lamp is a kind of resistive load, and when lamp voltage change, lamp power and brightness also change, but this light-dimming method is not energy-conservation.Incandescent lamp bulb with 25W is an example, drops at 60% o'clock at voltage, and the brightness of lamp has only original 30%.Gaseous discharge lamp (comprising fluorescent lamp, high-pressure sodium lamp, Metal halogen lamp etc.) has negative resistance charactertistic.When putting on lamp tube ends voltage and be lower than trigger voltage, lamp presents the high resistant off state, there is not electric current to flow through, in case applied voltage reaches the lamp trigger voltage, the fluorescent tube conducting, the voltage at its two ends reduces rapidly, the electric current increase presents negative resistance charactertistic, thereby can not realize light modulation with the method for regulation voltage, and this light-dimming method of PWM/PFM Synchronization Control is more energy-conservation, drop at 60% o'clock at power, the brightness of lamp also has original 70%.
The present invention follows a kind of method that the rule of gaseous discharge lamp realizes light modulation, makes lamp efficiency height, photochromic good, life-span length, stable performance, attractive in appearance energy-conservation by brightness adjustment control, meets the requirement of environment protecting and power-saving.
Summary of the invention
The invention provides a kind of PWM/PFM Synchronization Control light adjusting circuit, change with pulse duration and pulse frequency, regulating load is in the pulse duration of duty ratio 1%～100% and the pulse frequency excursion of setting, according to a kind of light adjusting circuit of the synchronous linear control method adjustments of gas discharge lamp of the brightness requirement of light modulation load brightness.
Pulse width modulation method (PWM) is to utilize the method that changes power supply pulse voltage duty ratio to realize light modulation.When pulse duration increased, then pulse duty factor rose, and the load voltage of lamp is constant, and the power of lamp strengthens, thereby realized light modulation.
It is to utilize the method for regulating the power supply pulse frequency to realize light modulation that pulse frequency is regulated method (PFM).When pulse frequency increased, then the impedance of inductance increased, the electric current that causes flowing through lamp load descend from but realize light modulation.
Essence of the present invention is the power by the variation adjustments of gas discharge lamp of pulse duration and pulse frequency, and in order to make the lamp operate as normal, modulating voltage can not be lower than fluorescent tube conducting voltage threshold values under stable condition.Therefore the feasible program that changes lamp power (P=IV) is the electric current that changes lamp, in the operating load network series loop of lamp, because the impedance of resonance potential is the function (ZL=2 π fL) of frequency.When frequency increased, inductance induction reactance increased, and lamp current reduces, and lamp power reduces, and light is deepening then.Circuit inside is provided with the voltage-controlled oscillator of a synchronous linear change, changes the voltage of VCO, then can change frequency of oscillation, thereby realizes light modulation.
The PWM/PFM Synchronization Control is a kind of control method of more complicated, shows in the output pulse waveform it is synthetic a kind of dynamic pulse waveform after a kind of PWM and the PFM difference inverse change.For power, pulse duty factor is big, and frequency is low, and power output is big; Pulse duty factor is little, the frequency height, and power output is little, and Synchronization Control realized by anti-phase synthesizing.In lamp operating frequency minimum point, the pulse duration of high duty ratio is set.Lamp power output on highest frequency is then minimum, when the stenosis of frequency rising pulse duration, and the lamp power reduction, the light deepening reaches synchronous linearity light adjusting.
Simple PWM, PFM also can realize light modulation, but exist the weak point of embodiment separately.Adopt PWM, PFM Synchronization Control light-dimming method, can bring into play both advantages, overcome weak point, reach best dimming effect.
Description of drawings
Below in conjunction with drawings and Examples patent of the present invention is elaborated
Accompanying drawing 1 is PWM/PFM Synchronization Control light adjusting circuit functional block diagram of the present invention
Accompanying drawing 2 is the oscillogram of light modulation power in 52% brightness
Embodiment
PWM/PFM Synchronization Control light adjusting circuit comprises that power circuit, signal circuit, PWM produce circuit, pwm control circuit, OSC circuit, PFM control circuit, synchronization control circuit, function control circuit and drive circuit
1 for being described further invention PWM/PFM Synchronization Control light adjusting circuit function in conjunction with the accompanying drawings:
Power circuit inside produces accurate reference voltage after voltage stabilizing, be inner all element circuit power supplies.
The external low-limit frequency initialization circuit of oscillating circuit, and capacitor is charged by the PFM circuit from a reference source, after capacitor was set, its frequency of oscillation to the decision of charging current of condenser size, changed frequency by the V/F conversion by the PFM control circuit.
PWM produces circuit, after reference voltage and sampled feedback signal relatively amplify by error amplifier, and the difference signal of output and sawtooth signal stack, thus amplify the width that changes the output pulse by setting level.
PWM and PFM control circuit act on pwm control circuit and PFM control circuit through the dimming control signal of setting, and produce pwm signal and PFM signal.PWM changes pulse duration according to signal level, if the signal level increase then pulse duration reduce, PFM changes pulse frequency according to signal level, if the signal level increase then the pulse period reduce, and pulse frequency increases.
The PWM/PFM Synchronization Control is a kind of control method of more complicated, shows in the output pulse waveform it is synthetic a kind of dynamic pulse waveform after a kind of PWM and the PFM difference inverse change.For power, pulse duty factor is big, and frequency is low, and power output is big; Pulse duty factor is little, the frequency height, and power output is little, and Synchronization Control realized by anti-phase synthesizing.
Drive circuit contains the opposite output of both-end phase place, driving N PN transistor, and NPN transistor conducting bottom, top NPN transistor is closed, the size of the size decision back level bearing power of driving power.
Function protection circuit requires the stable working healthily of circuit is provided with quiescent centre time, temperature protection, soft start, the startup of utmost point low-power according to the professional technique of load light source.Circuit such as maximum power and minimum power limits.
Above-mentioned only is a concrete case study on implementation of the present invention, but design concept of the present invention is not limited thereto, and can do multiple variation on the basis of above-mentioned case study on implementation.Allly utilize this design that the present invention is carried out unsubstantiality to change, all belong to the behavior of invading protection range of the present invention.
Claims (5)
1. PWM and PFM Synchronization Control light adjusting circuit change regulating load with pulse duration and pulse frequency, in the pulse duration of duty ratio 1%～100% and the pulse frequency of setting, and a kind of gaseous discharge lamp light adjusting circuit of regulating of linear method synchronously.Circuit inside comprises that power circuit, PWM produce circuit, pwm control circuit, OSC circuit, PFM control circuit, PWM/PFM synchronization control circuit, function control circuit and drive circuit.
2. pwm control circuit according to claim 1 is characterized in that: this circuit requires to regulate pairing pulse duration by the setting to light-source brightness, reaches corresponding light-source brightness, and the variation of pulse duration and brightness variation are functional relation.
3. PFM control circuit according to claim 1 is characterized in that: this circuit requires to regulate pairing pulse frequency according to the setting to light-source brightness and reaches corresponding light-source brightness, and the variation of pulse frequency and brightness variation also are functional relation.
4. synchronization control circuit according to claim 1, it is characterized in that: this circuit PWM control circuit and PFM control circuit are according to the setting requirement of light-source brightness, make the synchronous linear change of PWM and PFM, making the level signal that is passed to this circuit is synthetic a kind of dynamic pulse signal after PWM, the PFM difference inverse change, by Changing Pattern, linear change and the Synchronization Control of setting requirement.
5. according to claims 1 described function control circuit, it is characterized in that: this circuit to the professional technique requirement, is provided with quiescent centre time to the stable working healthily of circuit according to load light source.Functions such as temperature protection, soft start, the startup of utmost point low-power, maximum power minimum power limits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100566352A CN101998745A (en) | 2009-08-19 | 2009-08-19 | PWM/PFM synchronous control dimming circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100566352A CN101998745A (en) | 2009-08-19 | 2009-08-19 | PWM/PFM synchronous control dimming circuit |
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| CN101998745A true CN101998745A (en) | 2011-03-30 |
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| CN2009100566352A Pending CN101998745A (en) | 2009-08-19 | 2009-08-19 | PWM/PFM synchronous control dimming circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101969303A (en) * | 2010-06-30 | 2011-02-09 | 艾默生网络能源系统北美公司 | Resonance circuit output characteristic control method |
| CN107359934A (en) * | 2017-08-30 | 2017-11-17 | 重庆理工大学 | Single channel dual signal live transmission method and system |
| CN108207055A (en) * | 2017-12-01 | 2018-06-26 | 上海亚明照明有限公司 | LED garage lights and its control method with intelligent control |
| CN111511071A (en) * | 2019-01-31 | 2020-08-07 | 松下知识产权经营株式会社 | PWM signal correction method, L ED lighting device |
| CN112822818A (en) * | 2019-11-15 | 2021-05-18 | 华润微集成电路(无锡)有限公司 | Circuit structure for realizing stepless dimming function |
-
2009
- 2009-08-19 CN CN2009100566352A patent/CN101998745A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101969303A (en) * | 2010-06-30 | 2011-02-09 | 艾默生网络能源系统北美公司 | Resonance circuit output characteristic control method |
| CN107359934A (en) * | 2017-08-30 | 2017-11-17 | 重庆理工大学 | Single channel dual signal live transmission method and system |
| CN107359934B (en) * | 2017-08-30 | 2019-04-23 | 重庆理工大学 | Single channel dual signal live transmission method and system |
| CN108207055A (en) * | 2017-12-01 | 2018-06-26 | 上海亚明照明有限公司 | LED garage lights and its control method with intelligent control |
| CN111511071A (en) * | 2019-01-31 | 2020-08-07 | 松下知识产权经营株式会社 | PWM signal correction method, L ED lighting device |
| CN112822818A (en) * | 2019-11-15 | 2021-05-18 | 华润微集成电路(无锡)有限公司 | Circuit structure for realizing stepless dimming function |
| CN112822818B (en) * | 2019-11-15 | 2023-11-10 | 华润微集成电路(无锡)有限公司 | Circuit structure for realizing electrodeless dimming function |
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Application publication date: 20110330 |