CN108366455A - It is a kind of that light-dimming method is simulated by the high P of primary side of pwm signal regulation and control - Google Patents
It is a kind of that light-dimming method is simulated by the high P of primary side of pwm signal regulation and control Download PDFInfo
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- CN108366455A CN108366455A CN201810171978.2A CN201810171978A CN108366455A CN 108366455 A CN108366455 A CN 108366455A CN 201810171978 A CN201810171978 A CN 201810171978A CN 108366455 A CN108366455 A CN 108366455A
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- pwm signal
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
Abstract
Light-dimming method is simulated by the high P of primary side of pwm signal regulation and control the invention discloses a kind of, it includes the charging for COMP capacitances especially built, discharge paths, the charging paths control effective charging time of the fixed reference electric current Iref to COMP capacitances by pwm signal, and then influence the voltage Vcomp of the COMP capacitances；The discharge paths discharge to COMP capacitances by variable current Ics；When the discharge current Ics is opened by metal-oxide-semiconductor from the voltage Vcs transformation of sampling resistor Rcs, and the service time Ton of the metal-oxide-semiconductor is converted to obtain by the Vcomp through V Ton, the close loop control circuit adjusted to Vcomp Cycle by Cycle is just formed in this way, discharge current and the duty ratio of pwm signal are uniquely corresponding when balance, namely the duty ratio by changing pwm signal finally can accordingly change LED drive current, simultaneously because the adjustment process is that Cycle by Cycle is carried out continuously, to can reach the effect of high P simulations light modulation.
Description
Technical field
The present invention relates to primary side high P simulation light modulations fields, more particularly to a kind of high P moulds of primary side regulated and controled by pwm signal
Quasi- light-dimming method.
Background technology
With development in science and technology, living standard is continuously improved, and the demand for illumination is not only that the switch of most original is lighted,
But need to realize to the dynamic regulation of brightness, coloration etc., in conjunction with the various control means of wall surface switch, APP, sensor etc.,
Achieve the purpose that it is flexible and convenient, follow one's inclinations and move, green energy conservation etc..
In fact, it is now very universal using the double-colored lamps and lanterns of changes in temperature, it is also gradually popular using tri- blended-lights of RGB.
This progress of LED lamp necessarily pushes the corresponding development of light modulation actuation techniques.
Simulation light regulating technology currently on the market, mostly using analog DC signal is applied, by changing benchmark electricity
The mode of pressure is realized.In use, the generation of analog signal is relatively cumbersome, also easily interfered by system noise, especially low
When brightness, the defects of control is inaccurate and easy stroboscopic；And digital PWM light modulation leads to PF because of closing control circuit between low period
The problems such as value reduces and easily stroboscopic is with transformer abnormal sound is generated.
Invention content
To solve the deficiency of prior art, the present invention proposes a kind of original adjusting output current using PWM duty cycle
The high P in side simulates light-dimming method, it is larger using COMP capacitances and in the case that charging and discharging currents are smaller, voltage Vcomp variations compared with
Slow characteristic, construction closed control circuit and Cycle by Cycle are adjusted until balance, are realized by PWM duty cycle finally to output current
It adjusts, to realize the purpose of high P simulations light modulation.
The present invention adopts the following technical scheme that：
It is a kind of that light-dimming method is simulated by the high P of primary side of pwm signal regulation and control comprising the filling for COMP capacitances especially built
Electricity, discharge paths, when the charging paths control effective chargings of the fixed reference electric current Iref to COMP capacitances by pwm signal
Between, and then influence the voltage Vcomp of the COMP capacitances；The discharge paths discharge to COMP capacitances by variable current Ics；Institute
It states from the voltage Vcs transformation of sampling resistor Rcs when discharge current Ics is opened by metal-oxide-semiconductor, and the service time of the metal-oxide-semiconductor
Ton is converted to obtain by the Vcomp through V-Ton, just forms the close loop control circuit adjusted to Vcomp Cycle by Cycle in this way, balance
When discharge current and the duty ratio of pwm signal it is uniquely corresponding, namely by change pwm signal duty ratio finally can accordingly change
LED drive current, while because the adjustment process is that Cycle by Cycle is carried out continuously, to can reach the effect of high P simulations light modulation.
Above-mentioned technical proposal has the advantages that：
Pwm signal is the digital signal being made of " 0 ", " 1 ", has natural anti-interference ability.Pwm signal uses in circuit
When, the influence of noise that is not easily susceptible on same PCB.Moreover, brightness adjustment control need it is mating with MCU, can directly with its PWM export pair
It connects, keeps system the most succinct.
When work, during the high level signal of PWM, fixed reference electric current Iref is to COMP capacitor chargings, and in its low electricity
During flat, stop charging.But because of charging and discharging currents very little, the voltage Vcomp on COMP capacitances is relatively slowly varying so that
Between PWM low periods, system still can Cycle by Cycle open metal-oxide-semiconductor work, it is not in current break to make output end.
Therefore, the program can not only overcome the problems, such as being easily disturbed when general analogue signal inputs, and can be simulated
The effect of light modulation, while because of the characteristic of its Cycle by Cycle conducting, system can be made to keep very high PF values, that is, reach high P simulations light modulation
Effect.
Above description is only the general introduction of technical solution of the present invention, in order to better understand the technical means of the present invention,
And can be implemented in accordance with the contents of the specification, with presently preferred embodiments of the present invention and attached drawing is coordinated to be described in detail below.
Description of the drawings
Fig. 1 is the circuit diagram of the embodiment of the present invention.
Specific implementation mode
It describes in detail below in conjunction with the accompanying drawings to the embodiment of the present invention.
As shown in Figure 1, a kind of high P simulation light-dimming methods of primary side by pwm signal regulation and control, by fixed reference electric current
Iref 101, PWM regulating switch 102, discharge current Ics 103, COMP capacitances 104, V-Ton conversion circuits 105, power is opened
Close the compositions such as pipe 106, sampling resistor Rcs 107, V-I conversion circuits 108, primary transformer coil 109.
After working on power, PWM regulating switch 102 is connected between PWM high periods, and fixed reference electric current Iref 101 is right
COMP capacitances 104 charge, its voltage Vcomp is made constantly to increase, and between PWM low periods, stop charging due to 102 close.
Under the action of V-Ton conversion circuits 105, specific Vcomp level conversions correspond to the specific of power switch tube 106 and open
Logical time Ton, and the power switch tube 106 within the Ton times is made to be connected.At this point, input voltage VI passes through primary transformer coil
109 form through power switch tube 106 and sampling resistor Rcs 107 to earth-return, the voltage Vcs quilts on sampling resistor Rcs 107
Sampling is sent to V-I conversion circuits 108, and conversion forms discharge current Ics, to make Vcomp decline.
Vcomp is higher, and Ton is bigger；Conversely, as the same.
The closed-loop control to Vcomp is just formd in this way so that PWM duty cycle is automatically corresponding with discharge current, to make
It is finally corresponding with PWM duty cycle to obtain LED drive current, you can complete the high P light modulations of simulation of Cycle by Cycle.
It is provided for the embodiments of the invention a kind of high P simulations light-dimming method progress of the primary side regulated and controled by pwm signal above
It is discussed in detail.The thought of embodiment according to the present invention in specific implementation mode and answers those of ordinary skill in the art
It is used with being easy to be changed in range.In conclusion the content of the present specification should not be construed as limiting the invention, it is all
Any change made according to design philosophy of the present invention is all within protection scope of the present invention.
Claims (5)
1. a kind of simulating light-dimming method by the high P of primary side of pwm signal regulation and control comprising the filling for COMP capacitances especially built
Electricity, discharge paths, when the charging paths control effective chargings of the fixed reference electric current Iref to COMP capacitances by pwm signal
Between, and then influence the voltage Vcomp of the COMP capacitances；The discharge paths discharge to COMP capacitances by variable current Ics；Institute
It states from the voltage Vcs transformation of sampling resistor Rcs when discharge current Ics is opened by metal-oxide-semiconductor, and the service time of the metal-oxide-semiconductor
Ton is converted to obtain by the Vcomp through V-Ton, just forms the close loop control circuit adjusted to Vcomp Cycle by Cycle in this way, balance
When discharge current and the duty ratio of pwm signal it is uniquely corresponding, namely by change pwm signal duty ratio finally can accordingly change
LED drive current, while because the adjustment process is that Cycle by Cycle is carried out continuously, to can reach the effect of high P simulations light modulation.
2. according to claim 1 simulate light-dimming method by the high P of primary side of pwm signal regulation and control, it is characterised in that：With one
A COMP capacitances.
3. according to claim 1 simulate light-dimming method by the high P of primary side of pwm signal regulation and control, it is characterised in that：With one
It is a that branch is charged and discharged to the COMP capacitances.
4. according to claim 1 simulate light-dimming method by the high P of primary side of pwm signal regulation and control, it is characterised in that：By PWM
Signal controls effective charging time to COMP capacitances.
5. according to claim 1 simulate light-dimming method by the high P of primary side of pwm signal regulation and control, it is characterised in that：With pair
The close loop control circuit that the Vcomp Cycle by Cycle is adjusted.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810171978.2A CN108366455B (en) | 2018-03-01 | 2018-03-01 | It is a kind of that light-dimming method is simulated by the high P of primary side of pwm signal regulation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810171978.2A CN108366455B (en) | 2018-03-01 | 2018-03-01 | It is a kind of that light-dimming method is simulated by the high P of primary side of pwm signal regulation |
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| Publication Number | Publication Date |
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| CN108366455A true CN108366455A (en) | 2018-08-03 |
| CN108366455B CN108366455B (en) | 2019-09-03 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201491361U (en) * | 2009-06-18 | 2010-05-26 | 刘小毛 | Direct current light modulator |
| CN102364991A (en) * | 2011-02-01 | 2012-02-29 | 杭州士兰微电子股份有限公司 | Switching power supply controller for constant current driving of LED by primary side control and method for constant current driving of LED |
| CN202334314U (en) * | 2011-11-25 | 2012-07-11 | 成都芯源系统有限公司 | Switching power supply for LED driving and control circuit thereof |
| CN104135789A (en) * | 2014-06-10 | 2014-11-05 | 矽力杰半导体技术(杭州)有限公司 | Primary-side controlled LED (Light Emitting Diode) driving method and driving circuit |
| CN104159367A (en) * | 2014-07-30 | 2014-11-19 | 华南理工大学 | LED light modulator based on PAM and PWM and dimming method of LED light modulator based on PAM and PWM |
| US9369050B1 (en) * | 2014-04-21 | 2016-06-14 | Universal Lighting Technologies, Inc. | Indirect current sensing method for a constant current flyback converter |
| CN106954307A (en) * | 2017-04-10 | 2017-07-14 | 深圳天源中芯半导体有限公司 | A kind of PWM light adjusting circuits for High Power Factor primary side feedback LED drive power |
-
2018
- 2018-03-01 CN CN201810171978.2A patent/CN108366455B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201491361U (en) * | 2009-06-18 | 2010-05-26 | 刘小毛 | Direct current light modulator |
| CN102364991A (en) * | 2011-02-01 | 2012-02-29 | 杭州士兰微电子股份有限公司 | Switching power supply controller for constant current driving of LED by primary side control and method for constant current driving of LED |
| CN202334314U (en) * | 2011-11-25 | 2012-07-11 | 成都芯源系统有限公司 | Switching power supply for LED driving and control circuit thereof |
| US9369050B1 (en) * | 2014-04-21 | 2016-06-14 | Universal Lighting Technologies, Inc. | Indirect current sensing method for a constant current flyback converter |
| CN104135789A (en) * | 2014-06-10 | 2014-11-05 | 矽力杰半导体技术(杭州)有限公司 | Primary-side controlled LED (Light Emitting Diode) driving method and driving circuit |
| CN104159367A (en) * | 2014-07-30 | 2014-11-19 | 华南理工大学 | LED light modulator based on PAM and PWM and dimming method of LED light modulator based on PAM and PWM |
| CN106954307A (en) * | 2017-04-10 | 2017-07-14 | 深圳天源中芯半导体有限公司 | A kind of PWM light adjusting circuits for High Power Factor primary side feedback LED drive power |
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| CN108366455B (en) | 2019-09-03 |
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