CN108366455B - It is a kind of that light-dimming method is simulated by the high P of primary side of pwm signal regulation - Google Patents
It is a kind of that light-dimming method is simulated by the high P of primary side of pwm signal regulation Download PDFInfo
- Publication number
- CN108366455B CN108366455B CN201810171978.2A CN201810171978A CN108366455B CN 108366455 B CN108366455 B CN 108366455B CN 201810171978 A CN201810171978 A CN 201810171978A CN 108366455 B CN108366455 B CN 108366455B
- Authority
- CN
- China
- Prior art keywords
- pwm signal
- cycle
- discharge
- vcomp
- primary side
- 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.)
- Active
Links
Classifications
-
- 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 the invention discloses a kind of, it includes the charging for COMP capacitor especially constructed, discharge paths, the charging paths control fixed reference electric current Iref to effective charging time of COMP capacitor by pwm signal, and then influence the voltage Vcomp of the COMP capacitor；The discharge paths discharge to COMP capacitor by discharge 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 conversion circuit, 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 close loop control circuit balances, 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 simulation light modulation.
Description
Technical field
The present invention relates to the high P of primary side to simulate light modulation field, more particularly to a kind of high P mould of primary side regulated and controled by pwm signal
Quasi- light-dimming method.
Background technique
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 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-light 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 vulnerable to the interference of system noise, especially low
When brightness, control inaccuracy and the defects of 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.
Summary of the invention
For the deficiency for solving prior art, the present invention proposes a kind of original that output electric current is adjusted using PWM duty cycle
The high P in side simulates light-dimming method, it is larger using COMP capacitor and in the lesser situation of charging and discharging currents, voltage Vcomp variation 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 electric current
It adjusts, to realize the purpose of high P simulation light modulation.
The present invention adopts the following technical scheme:
A kind of high P of primary side by pwm signal regulation simulates light-dimming method comprising especially construct for COMP capacitor
Charging, discharge paths, when the charging paths control effective charging of the fixed reference electric current Iref to COMP capacitor by pwm signal
Between, and then influence the voltage Vcomp of the COMP capacitor；The discharge paths discharge to COMP capacitor by discharge 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 conversion circuit, is just formed return to the closed-loop control that Vcomp Cycle by Cycle is adjusted in this way
Road, discharge current and the duty ratio of pwm signal are uniquely corresponding when close loop control circuit balances, namely by changing 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 simulation light modulation.
Above-mentioned technical proposal has the following beneficial effects:
Pwm signal is the digital signal being made of " 0 ", " 1 ", has natural anti-interference ability.Pwm signal is in circuit
In use, being not easily susceptible to the influence of noise on same PCB.Moreover, brightness adjustment control needs are mating with MCU, it can be directly defeated with its PWM
It docks out, keeps system the most succinct.
When work, during the high level signal of PWM, fixed reference electric current Iref is to COMP capacitor charging, and in its low electricity
During flat, stop charging.But because of charging and discharging currents very little, the voltage Vcomp on COMP capacitor is relatively slowly varying, so that
Between PWM low period, system still can Cycle by Cycle open metal-oxide-semiconductor work, making output end is not in current break.
Therefore, when the program can not only overcome general analogue signal to input vulnerable to interference problem, 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 value, that is, reach high P simulation light modulation
Effect.
The above description is only an overview of the technical scheme 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 cooperated to be described in detail below.
Detailed description of the invention
Fig. 1 is the circuit diagram of the embodiment of the present invention.
Specific embodiment
It describes in detail with reference to the accompanying drawing to the embodiment of the present invention.
As shown in Figure 1, a kind of high P simulation light-dimming method of primary side by pwm signal regulation, by fixed reference electric current
Iref 101, PWM regulating switch 102, discharge current Ics 103, COMP capacitor 104, V-Ton conversion circuit 105, power switch
Pipe 106, sampling resistor Rcs 107, V-I conversion circuit 108, primary transformer coil 109 is equal to be constituted.
After working on power, PWM regulating switch 102 is connected between PWM high period, and fixed reference electric current Iref 101 is right
COMP capacitor 104 charges, and constantly increase its voltage Vcomp, and between PWM low period, stop charging due to 102 close.
Under the action of V-Ton conversion circuit 105, specific Vcomp level conversion corresponds to the specific of power switch tube 106 and opens
Logical time Ton, and the power switch tube 106 within the Ton time is 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 quilt on sampling resistor Rcs 107
Sampling is sent to V-I conversion circuit 108, and conversion forms discharge current Ics, so that Vcomp be made to decline.
Vcomp is higher, and Ton is bigger；Conversely,.
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
LED drive current is finally corresponding with PWM duty cycle, the high P of simulation that Cycle by Cycle can be completed is dimmed.
It is provided for the embodiments of the invention a kind of high P simulation light-dimming method progress of the primary side by pwm signal regulation above
It is discussed in detail.Thought according to an embodiment of the present invention in specific embodiment and answers those of ordinary skill in the art
It is used with being easy to be changed in range.In conclusion the contents of this specification are not to 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 simulate light-dimming method by the high P of primary side of pwm signal regulation comprising the filling for COMP capacitor especially constructed
Electricity, discharge paths, when the charging paths control effective charging of the fixed reference electric current Iref to COMP capacitor by pwm signal
Between, and then influence the voltage Vcomp of the COMP capacitor；The discharge paths discharge to COMP capacitor by discharge 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 conversion circuit, is just formed return to the closed-loop control that Vcomp Cycle by Cycle is adjusted in this way
Road, discharge current and the duty ratio of pwm signal are uniquely corresponding when close loop control circuit balances, namely by changing 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 simulation light modulation.
2. according to claim 1 simulate light-dimming method by the high P of primary side of pwm signal regulation, it is characterised in that: have one
A COMP capacitor.
3. according to claim 1 simulate light-dimming method by the high P of primary side of pwm signal regulation, it is characterised in that: have one
It is a that branch is charged and discharged to the COMP capacitor.
4. according to claim 1 simulate light-dimming method by the high P of primary side of pwm signal regulation, it is characterised in that: by PWM
Signal controls effective charging time to COMP capacitor.
5. the primary side high P according to claim 1 by pwm signal regulation simulates light-dimming method, it is characterised in that: have pair
The close loop control circuit that the Vcomp Cycle by Cycle is adjusted.
Priority Applications (1)
| 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 |
Applications Claiming Priority (1)
| 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108366455A CN108366455A (en) | 2018-08-03 |
| CN108366455B true CN108366455B (en) | 2019-09-03 |
Family
ID=63003016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810171978.2A Active 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 |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108366455B (en) |
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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108366455A (en) | 2018-08-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105491761B (en) | The LED light of adjustable color temperature and the color temperature adjusting method of LED light | |
| CN202425098U (en) | LED illumination drive circuit automatically modulating light according to ambient light | |
| CN107222953B (en) | Numerical model analysis dims constant-current controller integrated circuit | |
| CN106256173A (en) | Simulation and digital dimming for LED driver control | |
| CN103857149A (en) | LED lighting apparatus, current regulator for the LED lighting apparatus, and current regulation method of the LED lighting apparatus | |
| CN110495252A (en) | Connection process for load control device | |
| CN206650895U (en) | A kind of tunable optical color-adjustable RGB LEDs of direct current supply | |
| CN107071985A (en) | One kind control circuit and light fixture | |
| CN205987484U (en) | Backlight unit's drive circuit , backlight unit and display device | |
| CN208317065U (en) | LED drive power based on the toning of 2.4G remote control light modulating | |
| CN205491361U (en) | LED lamp of adjustable colour temperature | |
| CN106304509B (en) | Illuminating circuit and its controller and control method of application | |
| CN205830095U (en) | A kind of LED matrix of adjustable color temperature | |
| CN108012367B (en) | A kind of PWM light-dimming method of LED | |
| CN108366455B (en) | It is a kind of that light-dimming method is simulated by the high P of primary side of pwm signal regulation | |
| CN108307562B (en) | It is a kind of to be regulated and controled by single line PWM and the primary side light-dimming method of pattern switching | |
| CN102149245B (en) | Electronic ballast of efficient and light-adjustable gas discharge lamp | |
| CN209627758U (en) | A kind of LED control circuit of compatible light modulation color-temperature regulating | |
| CN208572491U (en) | Control circuit, LED drive chip and LED drive system | |
| CN106102221A (en) | A kind of LED light adjusting circuit | |
| CN108366454A (en) | A kind of compatible analog, digital dimming PWM primary sides regulate and control method | |
| CN206118124U (en) | But low pressure is remote control light modulation lamp cluster regularly | |
| CN209170706U (en) | A kind of intelligent LED light adjusting circuit that voltage follows automatically | |
| CN204697349U (en) | A kind of active human body infrared control circuit | |
| CN107658958A (en) | A kind of electro-optical system and photo-electric control method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |