CN108366454A - A kind of compatible analog, digital dimming PWM primary sides regulate and control method - Google Patents
A kind of compatible analog, digital dimming PWM primary sides regulate and control method Download PDFInfo
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- CN108366454A CN108366454A CN201810171172.3A CN201810171172A CN108366454A CN 108366454 A CN108366454 A CN 108366454A CN 201810171172 A CN201810171172 A CN 201810171172A CN 108366454 A CN108366454 A CN 108366454A
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- pwm
- comp
- capacitances
- vcomp
- discharge
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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
The invention discloses the PWM primary sides of a kind of compatible analog, digital dimming to regulate and control method, including especially build the charging for COMP capacitances, 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 power switch 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, in the grid for connecting the metal-oxide-semiconductor with control signal MD phases or the switch controlled afterwards by PWM, the close loop control circuit adjusted to Vcomp is just formed in this way, " 1 " of corresponding MD or " 0 " selectively operating are in analog or digital PWM light-modulating modes, 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, to can reach the effect of analog or digital light modulation.
Description
Technical field
The present invention relates to primary side PWM to dim field, more particularly to a kind of compatible analog, the PWM primary side tune of digital dimming
Prosecutor 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.
Mainly there are the primary sides technologies such as 0-10V simulations light modulation, the light modulation of PWM count word currently on the market, also has using secondary side feedback
Driving in the way of external MCU PWM adjustings, but needs to increase MCU power supplies and other mating peripheral circuits, and cost is relatively inclined
It is high.Since technical realization limits, all in all, there are poor anti-interference, light modulation depth not enough to wait and lack for existing simulation light modulation
The problems such as sunken, and digital PWM dims the reduction for easily leading to PF values and stroboscopic and noise.
In fact, if using simulation light modulation, current generally existing dims region in low-light level, due to the blanking time
In the presence of making light modulation depth generally can only achieve 7% or so；As used in PWM count word dimming mode, although light modulation depth can be extremely
1 ‰, but will appear the problem of PF values reduce, cause product that cannot meet the requirement of related PF values in the larger region of power.
Invention content
To solve the deficiency of prior art, the present invention proposes the PWM primary side tune of a kind of compatible analog, digital dimming
Prosecutor method utilizes input control signal MD, by its high and low level, the light-modulating mode of selection or switching circuit, to realize
Primary side PWM simulation, the mutual supplement with each other's advantages of digital dimming mode, reach can depth light modulation, and realize high P simulations in relatively high power area
The purpose of light modulation.
The present invention adopts the following technical scheme that：
A kind of compatible analog, digital dimming PWM primary sides regulate and control method, including especially build for COMP capacitances charging,
Discharge paths, the charging paths control effective charging time of the fixed reference electric current Iref to COMP capacitances by pwm signal, into
And influence the voltage Vcomp of the COMP capacitances；The discharge paths discharge to COMP capacitances by variable current Ics；It is described to put
When electric current Ics is opened by power switch metal-oxide-semiconductor from the voltage Vcs transformation of sampling resistor Rcs, and the metal-oxide-semiconductor is open-minded
Time Ton is converted to obtain by the Vcomp through V-Ton, described in being connect with control signal MD phases or the switch controlled afterwards by PWM
The grid of metal-oxide-semiconductor, just forms the close loop control circuit adjusted to Vcomp in this way, and " 1 " or " 0 " selectively operating of corresponding MD exists
Analog or digital PWM light-modulating modes, discharge current and the duty ratio of pwm signal are uniquely corresponding when balance, namely pass through and change PWM
The duty ratio of signal finally can accordingly change LED drive current, to can reach the effect of analog or digital 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, when controlling signal MD=" 1 ", analog dimming mode is selected.Between the high period of PWM, fixed reference electric current
Iref stops charging to COMP capacitor chargings, and between its low period.But because of charging and discharging currents very little, on COMP capacitances
Voltage Vcomp is relatively slowly varying so that between PWM low periods, system still can Cycle by Cycle open metal-oxide-semiconductor work, make defeated
Outlet is not in current break.
Signal MD=" 0 " is controlled, digital dimming mode is selected.Between the high period of PWM, work is same as above；And in low period
Between, then power MOS pipe is directly closed, until next PWM high level is come.Vcomp discharge offs circuit after being closed because of metal-oxide-semiconductor, because
The Ton that this V-Ton is converted to is constant, will not be less than the blanking time, therefore can be transferred to profound light modulation area always, can reach
1‰。
Therefore, the program can not only overcome the problems, such as being easily disturbed when general analogue signal inputs, and can be relatively highlighted
Spend area（7% or more）High P simulations light modulation is realized, while by pattern switching to digital dimming, to obtain the effect of depth light modulation
Fruit.
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, the PWM primary sides of a kind of compatible analog, digital dimming regulate and control method, 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 structures such as pipe 106, sampling resistor Rcs 107, V-I conversion circuits 108, primary transformer coil 109 or door 110, switch 111
At.
After working on power, when controlling signal MD=" 1 " or door 110 exports high level, and switch 111 is connected：
At this point, PWM regulating switch 102 is connected between PWM high periods, fixed reference electric current Iref 101 is to COMP capacitances 104
Charging, makes its voltage Vcomp constantly rise, 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.
And when controlling signal MD=" 0 " or the output of door 110 is pwm signal, switch 111 leads between PWM high periods
It is logical, and closed in low level, that is, select digital dimming mode to work：
At this point, the maximum difference with simulation light modulation is in PWM low levels area, switch 111 is turned off, and Vcomp is no longer discharged, because
This Ton will not enter in blanking time area, and LED drive current can be adjusted until 1 ‰ always, but because non-Cycle by Cycle is adjusted, PF
Value will constantly decline.
Refer to the attached drawing 1, in conjunction with the above analysis, the specific work process of PWM count word light modulation is it can be appreciated that therefore no longer superfluous herein
It states.
It is provided for the embodiments of the invention a kind of PWM primary sides regulation and control method progress of compatible analog, digital dimming 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. the PWM primary sides of a kind of compatible analog, digital dimming regulate and control method, including 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 power switch metal-oxide-semiconductor, and the metal-oxide-semiconductor
Service time Ton is converted to obtain by the Vcomp through V-Ton, is being connect with control signal MD phases or the switch controlled afterwards by PWM
The grid of the metal-oxide-semiconductor, just forms the close loop control circuit adjusted to Vcomp in this way, and work may be selected in " 1 " or " 0 " of corresponding MD
It is uniquely corresponding to make discharge current and the duty ratio of pwm signal in analog or digital PWM light-modulating modes, balance, namely by changing
Becoming the duty ratio of pwm signal finally can accordingly change LED drive current, to can reach the effect of analog or digital light modulation.
2. the PWM primary sides of compatible analog according to claim 1, digital dimming regulate and control method, it is characterised in that：With one
A COMP capacitances.
3. the PWM primary sides of compatible analog according to claim 1, digital dimming regulate and control method, it is characterised in that：By PWM
Signal controls effective charging time to COMP capacitances.
4. the PWM primary sides of compatible analog according to claim 1, digital dimming regulate and control method, it is characterised in that：With MD
Signal is controlled, to select or switch between simulation, digital dimming mode.
5. the PWM primary sides of compatible analog according to claim 1, digital dimming regulate and control method, it is characterised in that：With pair
The close loop control circuit that the Vcomp is adjusted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810171172.3A CN108366454A (en) | 2018-03-01 | 2018-03-01 | A kind of compatible analog, digital dimming PWM primary sides regulate and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810171172.3A CN108366454A (en) | 2018-03-01 | 2018-03-01 | A kind of compatible analog, digital dimming PWM primary sides regulate and control method |
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| CN108366454A true CN108366454A (en) | 2018-08-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810171172.3A Pending CN108366454A (en) | 2018-03-01 | 2018-03-01 | A kind of compatible analog, digital dimming PWM primary sides regulate and control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109548244A (en) * | 2018-12-29 | 2019-03-29 | 上海晶丰明源半导体股份有限公司 | Dimming interface control circuit and method, LED drive system, chip and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105682286A (en) * | 2016-01-25 | 2016-06-15 | 杭州创博科技有限公司 | LED power supply drive chip for utility tunnel and drive power supply circuit |
| CN106163003A (en) * | 2016-07-27 | 2016-11-23 | 成都翰道科技有限公司 | A kind of LED dimming drive power based on ripple peak restrained circuit |
| 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 |
| CN206640841U (en) * | 2017-04-10 | 2017-11-14 | 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 |
| CN108307562A (en) * | 2018-02-27 | 2018-07-20 | 深圳赫飞物联科技有限公司 | It is a kind of to be regulated and controled by single line PWM and the primary side light-dimming method of pattern switching |
-
2018
- 2018-03-01 CN CN201810171172.3A patent/CN108366454A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105682286A (en) * | 2016-01-25 | 2016-06-15 | 杭州创博科技有限公司 | LED power supply drive chip for utility tunnel and drive power supply circuit |
| CN106163003A (en) * | 2016-07-27 | 2016-11-23 | 成都翰道科技有限公司 | A kind of LED dimming drive power based on ripple peak restrained circuit |
| 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 |
| CN206640841U (en) * | 2017-04-10 | 2017-11-14 | 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 |
| CN108307562A (en) * | 2018-02-27 | 2018-07-20 | 深圳赫飞物联科技有限公司 | It is a kind of to be regulated and controled by single line PWM and the primary side light-dimming method of pattern switching |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109548244A (en) * | 2018-12-29 | 2019-03-29 | 上海晶丰明源半导体股份有限公司 | Dimming interface control circuit and method, LED drive system, chip and method |
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Application publication date: 20180803 |