CN107803349A - A kind of PWM adjusting control circuits of corn color selector - Google Patents
A kind of PWM adjusting control circuits of corn color selector Download PDFInfo
- Publication number
- CN107803349A CN107803349A CN201711207772.2A CN201711207772A CN107803349A CN 107803349 A CN107803349 A CN 107803349A CN 201711207772 A CN201711207772 A CN 201711207772A CN 107803349 A CN107803349 A CN 107803349A
- Authority
- CN
- China
- Prior art keywords
- current
- color selector
- control circuits
- led
- vcs
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
- B07C5/342—Sorting according to other particular properties according to optical properties, e.g. colour
- B07C5/3425—Sorting according to other particular properties according to optical properties, e.g. colour of granular material, e.g. ore particles, grain
-
- 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]
-
- 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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a kind of PWM adjusting control circuits of corn color selector, it is related to color selector technical field.The PWM adjusting control circuits of the corn color selector, including LED, RSENSE, detection voltage Vcs, detection resistance and DIM dim signals, inductance L, sustained diode and hysteretic loop current control module, the reacting condition of LED drive current is in the pressure difference change at detection resistance RSENSE both ends, detection resistance is set to 0.5 Ω, to reduce power consumption and keep higher conversion efficiency.The PWM adjusting control circuits of the corn color selector, using high side current detection mode, Hysteresis control is carried out to driving current with method for controlling hysteresis loop current, so as to obtain constant average driving current, realize that constant current drives using simple design concept, it is not necessary to complicated circuit analysis, accurate current control can be realized, cost is relatively low, and self stability is stronger, beneficial to promoting the use of.
Description
Technical field
The present invention relates to color selector technical field, specially a kind of PWM adjusting control circuits of corn color selector.
Background technology
Color selector is according to the difference of material optical characteristics, using detecting technique by the heterochromatic particle in granule materials
The equipment that automatic sorting comes out.Color selector is used for bulk material or packaging industry product, food quality detection and classification neck at present
Domain.Photoelectric colour sorter is a kind of lossless screening installation for bulk material Quality Detection and classification, in grain, food, pigment
The industries such as chemical industry have a wide range of applications, to the big regenerated plastics piece of sorting difficulty, plastic grain, corn, various beans, various
Rice, ore, capsicum, Chinese prickly ash, garlic rice, bags of melon seeds, raisins, seed, Chinese medicine, dried shrimps, dried small shrimp, silver anchovy, glass, metal,
The pernicious impurity such as homochromy bar and extraordinary material separating effect all very significantly, are reached the international leading level.Color selector is according to thing
Expect the difference of optical characteristics, the equipment for the heterochromatic particle automatic sorting in granule materials being come out using detecting technique.Color
Owner is selected to be made up of feeding system, Systems for optical inspection, signal processing system and separation execution system.
With highlighting for the advantages such as the energy-saving and environmental protection of LED backlight, high-performance, the backlight of LCD screen is gradually from CCFL to LED
Switch, the liquid crystal display of company also gradually obtains model from CCFL backlights and switched to the model of LED backlight at present.The pattern of two kinds of backlights
Maximum difference is type of drive, and the backlight drive of the screen of CCFL backlights needs inverter to provide high pressure, and the drive of LED backlight
Flowing mode is relatively easy, it is only necessary to constant low-voltage dc power supply, but either inverter, or LED backlight
Drive circuit, can all use a kind of PWM light regulating technologies, the brightness size to backlight is adjusted.
PWM is a kind of to the digitally coded method of analog signal level progress.By the use of high-resolution counter,
The dutycycle of square wave is modulated for being encoded to the level of a physical simulation signal.PWM signals are still numeral,
Because at given any moment, otherwise the direct current supply of full amplitude has completely（ON）Or entirely without（OFF）.Voltage or electricity
Stream source is logical with one kind（ON）It is or disconnected（OFF）Repetition pulse sequence be added to fictitious load get on.It is when logical
When being that power supply is disconnected when direct current supply is added in load, when disconnected.As long as bandwidth is enough, any simulation
Value can be encoded using PWM.
At present, the existing control circuit for corn color selector PWM light modulations, complicated, cost is higher, is unfavorable for pushing away
It is wide to use.
The content of the invention
（One）The technical problem of solution
In view of the shortcomings of the prior art, the invention provides a kind of PWM adjusting control circuits of corn color selector, solve existing
Be used for corn color selector PWM light modulation control circuit, complicated, cost is higher, the problem of being unfavorable for promoting the use of.
（Two）Technical scheme
To realize object above, the present invention is achieved by the following technical programs：A kind of PWM brightness adjustment controls of corn color selector
Circuit, including LED, RSENSE, detection voltage Vcs, detection resistance and DIM dim signals, inductance L, sustained diode and
Hysteretic loop current control module, the reacting condition of LED drive current is in the pressure difference change at detection resistance RSENSE both ends, detection
Resistance is set to 0.5 Ω, to reduce power consumption and keep higher conversion efficiency, self-built two voltage of hysteretic loop current control inside modules
Threshold value, voltage Vcs is with threshold voltage compared with for detection, comparative result and DIM dim signals phase and to control power switch pipe
Break-make.
Preferably, when DIM signals are between high period, when Vcs is more than upper voltage threshold, the low electricity of control circuit output
It is flat, power switch pipe is closed, by LED, inductance L, sustained diode and the RSENSE loop formed inductance is continued as
LED provides electric current, and inductive current is gradually reduced so that and detection voltage Vcs reduces therewith, when Vcs is less than lower threshold voltages,
Control circuit output high level, conducting power switch pipe, now D cut-offs, are formed from power supply through RSENSE, LED, L and power
Switching tube is to the loop on ground, and power supply is inductance L chargings, and inductive current rises, and detection voltage Vcs is increased, when Vcs is more than
During upper voltage threshold, control circuit on-off switching tube, the action in last cycle is repeated, complete the stagnant ring electricity to LED drive current
Flow control so that flow through L ED driving current, i.e. the average value of inductive current is constant.
Preferably, 4.5V-28V input voltage is adjusted in viscous flow control module internal module is converted to the constant of 5V
Voltage vcc is powered for subsequent conditioning circuit.
（Three）Beneficial effect
The invention provides a kind of PWM adjusting control circuits of corn color selector, possesses following beneficial effect：
The PWM adjusting control circuits of the corn color selector, using high side current detection mode, with method for controlling hysteresis loop current pair
Driving current carries out Hysteresis control, so as to obtain constant average driving current, realizes that constant current is driven using simple design concept
It is dynamic, it is not necessary to complicated circuit analysis, accurate current control to be realized, cost is relatively low, and self stability is stronger, beneficial to pushing away
It is wide to use, solve the existing control circuit for corn color selector PWM light modulations, complicated, cost is higher, is unfavorable for pushing away
Wide the problem of using.
Brief description of the drawings
Fig. 1 is viscous flow control module circuit diagram of the present invention；
Fig. 2 is viscous flow control module internal module circuit diagram of the present invention；
Fig. 3 is circuit diagram caused by viscous flow comparison voltage of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.
The present invention provides a kind of technical scheme：A kind of PWM adjusting control circuits of corn color selector, referring to Fig. 1, including
LED, RSENSE, detection voltage Vcs, detection resistance and DIM dim signals, inductance L, sustained diode and hysteresis current control
Molding block, for the reacting condition of LED drive current in the pressure difference change at detection resistance RSENSE both ends, detection resistance is set to 0.5
Ω, less detection resistance advantageously reduce power consumption and keep higher conversion efficiency, and hysteretic loop current control inside modules are self-built
Two voltage thresholds, voltage Vcs is with threshold voltage compared with for detection, comparative result and DIM dim signals phase and to control work(
The break-make of rate switching tube.
Referring to Fig. 2, as a preferred technical solution of the present invention：Dimmed using PWM, reducing electric current duty cycle
It is interior to provide full current to LED, such as brightness is halved, complete electric current only need to be provided in 50 % duty cycle, is led to
The frequency of normal PWM dim signals can exceed 100Hz, to ensure that this pulse current will not be discovered by human eye；
When DIM signals are between high period, when Vcs is more than upper voltage threshold, control circuit output low level, power is closed
Switching tube, inductance is caused to continue as LED and provide electric current by LED, inductance L, sustained diode and the RSENSE loop formed,
Inductive current is gradually reduced so that detection voltage Vcs reduces therewith；
When Vcs is less than lower threshold voltages, control circuit output high level, conducting power switch pipe, now D cut-offs, formed
From power supply through RSENSE, LED, L and power switch pipe to the loop on ground, power supply is inductance L chargings, and inductive current rises, inspection
Voltage Vcs is surveyed to increase；
When Vcs is more than upper voltage threshold, control circuit on-off switching tube, the action in last cycle is repeated, complete to drive LED
The hysteretic loop current control of streaming current so that flow through L ED driving current, i.e. the average value of inductive current is constant.
Fig. 2-3 are referred to, as a preferred technical solution of the present invention：4.5V- in viscous flow control module internal module
The adjusted constant voltage Vcc for being converted to 5V of 28V input voltage powers for subsequent conditioning circuit；
A point current potentials are clamped down on by operational amplifier, will be equal to reference voltage 1.2V, it is assumed that output Vout is high level, then M2 is led
Logical, the electric current for flowing through M1 is IM1=Vref/R2, and the voltage of B points is VBL=Vin-IM1 R1；
When V out are low level, M2 ends, and the electric current for flowing through M1 is changed into I ' M1=Vref/(R2+R3), B point voltage liters
A height of VBH=Vin-I ' M1 R1, so the change of B point voltages turns to Δ VB=VBH-VBL=V ref R1 R3/R2 (R2+
R3), when Vout becomes low level as high level in B points caused by a stagnant loop voltag, the stagnant loop voltag and input voltage without
Close, only determined by reference voltage Vref and resistance sizes, by selecting the resistance of each resistance to set the size of stagnant loop voltag.
The electric elements occurred in this article electrically connect with the main controller and 220V civil powers in the external world, and main controller can be meter
Calculation machine etc. plays the conventionally known equipment of control, and the correlation module being related in this article is hardware system module or is existing
The functional module that technology Computer Software program or agreement are combined with hardware, the computer involved by the functional module are soft
The technology being well known to those skilled in the art in itself of part program or agreement, it is not the improvements of the system；The system
The interaction relationship being improved between each module or annexation, as the overall construction of system is improved, with
Solves the problems, such as the system relevant art to be solved.
In summary, the PWM adjusting control circuits of the corn color selector, using high side current detection mode, with stagnant ring
Current control method carries out Hysteresis control to driving current, so as to obtain constant average driving current, using simple design
Theory realizes that constant current drives, it is not necessary to complicated circuit analysis, can realize accurate current control, cost is relatively low, and itself is steady
It is qualitative relatively strong, beneficial to promoting the use of, solve the existing control circuit for corn color selector PWM light modulations, it is complicated, into
This is higher, the problem of being unfavorable for promoting the use of.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, technique according to the invention scheme and its
Inventive concept is subject to equivalent substitution or change, should all be included within the scope of the present invention.
Claims (5)
1. a kind of PWM adjusting control circuits of corn color selector, including LED, RSENSE, detection voltage Vcs, detection resistance and
DIM dim signals, inductance L, sustained diode and hysteretic loop current control module, it is characterised in that：The change of LED drive current
Change reaction in the pressure difference change at detection resistance RSENSE both ends, detection resistance is set to 0.5 Ω, to reduce power consumption and keep higher
Conversion efficiency, self-built two voltage thresholds of hysteretic loop current control inside modules, detection voltage Vcs compared with threshold voltage
Compared with, comparative result and DIM dim signals phase with controlling the break-make of power switch pipe.
A kind of 2. PWM adjusting control circuits of corn color selector according to claim 1, it is characterised in that：When DIM believes
Number between high period, when Vcs is more than upper voltage threshold, control circuit output low level, power switch pipe is closed, by
LED, inductance L, sustained diode and RSENSE composition loop cause inductance continue as LED provide electric current, inductive current by
It is decrescence small so that detection voltage Vcs reduces therewith.
3. a kind of PWM adjusting control circuits of corn color selector according to claim 1-2 any one, its feature exist
In：When Vcs is less than lower threshold voltages, control circuit output high level, conducting power switch pipe, now D end, formed from
Power supply is through RSENSE, LED, L and power switch pipe to the loop on ground, and power supply is inductance L chargings, and inductive current rises, detection
Voltage Vcs is increased.
4. a kind of PWM adjusting control circuits of corn color selector according to claim 1-3 any one, its feature exist
In：When Vcs is more than upper voltage threshold, control circuit on-off switching tube, the action in last cycle is repeated, complete to drive LED
The hysteretic loop current control of electric current so that flow through L ED driving current, i.e. the average value of inductive current is constant.
5. a kind of PWM adjusting control circuits of corn color selector according to claim 1-4 any one, its feature exist
In：In viscous flow control module internal module 4.5V-28V input voltage it is adjusted be converted to 5V constant voltage Vcc be after
Continuous circuit power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711207772.2A CN107803349A (en) | 2017-11-27 | 2017-11-27 | A kind of PWM adjusting control circuits of corn color selector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711207772.2A CN107803349A (en) | 2017-11-27 | 2017-11-27 | A kind of PWM adjusting control circuits of corn color selector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107803349A true CN107803349A (en) | 2018-03-16 |
Family
ID=61581353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711207772.2A Pending CN107803349A (en) | 2017-11-27 | 2017-11-27 | A kind of PWM adjusting control circuits of corn color selector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107803349A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004020583A1 (en) * | 2004-04-27 | 2005-11-17 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | A switching circuit for driving light emitting diodes has an inverse DC voltage changer and current sensing resistor with a zener diode to control the LED current |
| CN101107760A (en) * | 2005-01-19 | 2008-01-16 | 爱特梅尔公司 | Current sensing analog to digital converter and method of use |
| CN101489342A (en) * | 2009-02-27 | 2009-07-22 | 杭州士兰微电子股份有限公司 | LED driver circuit and driving method thereof |
| CN101534046A (en) * | 2009-04-07 | 2009-09-16 | 上海源赋创盈电子科技有限公司 | Two-stage lead-edge-blanking filter for switch type power supply switching system |
| US20130293270A1 (en) * | 2012-05-04 | 2013-11-07 | Fairchild Korea Semiconductor Ltd. | Switch controller, switch control method, and power supply device comprising the switch controller |
| CN103747569A (en) * | 2013-12-25 | 2014-04-23 | 矽力杰半导体技术(杭州)有限公司 | PWM light modulation control method and control circuit, and LED driving circuit applying same |
| CN104578779A (en) * | 2013-10-23 | 2015-04-29 | 西安造新电子信息科技有限公司 | Hysteresis-current control circuit |
| CN105515096A (en) * | 2015-12-08 | 2016-04-20 | 无锡中感微电子股份有限公司 | Battery protection circuit and system thereof |
-
2017
- 2017-11-27 CN CN201711207772.2A patent/CN107803349A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004020583A1 (en) * | 2004-04-27 | 2005-11-17 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | A switching circuit for driving light emitting diodes has an inverse DC voltage changer and current sensing resistor with a zener diode to control the LED current |
| CN101107760A (en) * | 2005-01-19 | 2008-01-16 | 爱特梅尔公司 | Current sensing analog to digital converter and method of use |
| CN101489342A (en) * | 2009-02-27 | 2009-07-22 | 杭州士兰微电子股份有限公司 | LED driver circuit and driving method thereof |
| CN101534046A (en) * | 2009-04-07 | 2009-09-16 | 上海源赋创盈电子科技有限公司 | Two-stage lead-edge-blanking filter for switch type power supply switching system |
| US20130293270A1 (en) * | 2012-05-04 | 2013-11-07 | Fairchild Korea Semiconductor Ltd. | Switch controller, switch control method, and power supply device comprising the switch controller |
| CN104578779A (en) * | 2013-10-23 | 2015-04-29 | 西安造新电子信息科技有限公司 | Hysteresis-current control circuit |
| CN103747569A (en) * | 2013-12-25 | 2014-04-23 | 矽力杰半导体技术(杭州)有限公司 | PWM light modulation control method and control circuit, and LED driving circuit applying same |
| CN105515096A (en) * | 2015-12-08 | 2016-04-20 | 无锡中感微电子股份有限公司 | Battery protection circuit and system thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105898958B (en) | The constant current driving method and circuit of LED light tunable optical | |
| CN103247279B (en) | Light source driving circuit of light emitting diode and backlight module | |
| CN104242620B (en) | system with ripple suppression circuit and ripple suppression method thereof | |
| CN103280190A (en) | Backlight driving circuit, liquid crystal display device and backlight driving method | |
| CN106604444B (en) | voltage control device | |
| CN109712574A (en) | A kind of constant pressure and flow drive control circuit, driving power and television set | |
| US20150312981A1 (en) | Current adjusting device and adjustment method thereof | |
| CN107529242B (en) | A kind of LED drive circuit and method of equalization efficiency and power factor | |
| CN106954315A (en) | The driving power supply and television set of a kind of connection in series-parallel LED light bar network | |
| CN205648068U (en) | LED fluorescent lamp luminance adjustment system | |
| CN106507560A (en) | light-emitting diode backlight module and driving device thereof | |
| CN105992436A (en) | Led drive device and control method thereof | |
| WO2018010344A1 (en) | Stroboflash-free led light modulation driving power supply | |
| CN204836696U (en) | Constant -current drive circuit that LED lamp can be adjusted luminance | |
| CN203134330U (en) | LED display screen backlight brightness adjusting circuit and LED television | |
| CN104994638B (en) | The device of the remote adjusting brightness of LED lamps of controlled rectification ripple | |
| CN104853477B (en) | A kind of light emitting diode (LED) driver and its system | |
| CN107803349A (en) | A kind of PWM adjusting control circuits of corn color selector | |
| CN104053282B (en) | A kind of mixed color LED illuminator and drive circuit thereof | |
| CN105307305A (en) | LED power supply control device and TV set | |
| CN210579367U (en) | Linear constant-current stepless dimming controller integrated circuit, driving device and intelligent lighting lamp | |
| CN104507233A (en) | LED driving control circuit | |
| CN106879109A (en) | Controller, chip and method for eliminating LED drive system current ripples | |
| CN207706485U (en) | A kind of LED power | |
| CN108055719A (en) | The filter circuit that a kind of crawler color separator is dimmed with PWM |
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 | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180316 |