CN205830092U - A kind of pulse width modulation control signal adjusting control circuit and LED drive system - Google Patents
A kind of pulse width modulation control signal adjusting control circuit and LED drive system Download PDFInfo
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- CN205830092U CN205830092U CN201620623194.5U CN201620623194U CN205830092U CN 205830092 U CN205830092 U CN 205830092U CN 201620623194 U CN201620623194 U CN 201620623194U CN 205830092 U CN205830092 U CN 205830092U
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- Prior art keywords
- signal
- pulse width
- width modulation
- led drive
- drive system
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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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
This utility model provides a kind of pulse width modulation control signal adjusting control circuit and LED drive system.Wherein, described pulse width modulation control signal adjusting control circuit includes: power control switching module, for controlling the opening and closing of LED drive circuit；DIM control module, for receiving pulse width modulation control signal, when pulse width modulation control signal is low level, output DIM_OFF signal is with power control switching module described in positive closing, when pulse width modulation control signal becomes high level, output DIM_ON signal is with power control switching module described in enforced opening.Scheme of the present utility model had both avoided mistake and had entered OVP pattern, it also avoid the problem that demagnetization signal can not be detected and cannot be introduced into next switch periods, it is possible to achieve the real electrodeless control LED of pwm signal drives.
Description
Technical field
This utility model relates to a kind of LED control field, particularly relates to a kind of pulse width modulation control signal light modulation
Control circuit and LED drive system.
Background technology
Along with country's promotion energetically to energy-conserving and environment-protective, LED illumination, as a kind of new technique, has green, energy-conservation, environmental protection
Feature and be widely popularized.Along with the deep development of LED illumination technology, the demand of various intelligent lighting controls gets more and more,
Dimming including switch on wall, or use 2.4G, bluetooth, zigbee, wifi, the intelligent lighting of the controlled in wireless such as infrared is in
The eve of explosion type development.The development of these intelligent lighting demands also requires that simultaneously and drives control circuit for the LED of LED illumination
Can these wireless control modules compatible, it is possible to realize the demand of various intelligent dimming.One typical with wireless controller
Intelligent LED lighting system include: wireless control system and the big module of LED drive system two, wherein wireless control system according to
The control of user, output pulse width modulator control signal (PWM) arrives LED drive system, dims LED.Traditional pulse
Width modulated control signal (PWM) realizes the principle of light modulation: when PWM is high level, LED drive system normally works, when
When PWM is low level, PWM positive closing power control switching module, LED drive system quits work.Current existing LED drives
Dynamic control circuit be difficult to can the control of compatible various intelligent wireless controllers, during light modulation, easily cause LED and dodge
Lamp, or real non-pole light regulating can not be realized, client cause bad light modulation experience.
In consideration of it, how to find a kind of pulse width modulation control signal brightness adjustment control preferably dimming experience to client
Scheme has just become those skilled in the art's problem demanding prompt solution.
Utility model content
The shortcoming of prior art in view of the above, the purpose of this utility model is to provide a kind of pulse width modulation control
Signal adjusting control circuit processed and LED drive system, be used for solving existing LED in prior art and drive control circuit in light modulation
During, easily cause LED flashing light, client is caused the problem that bad light modulation is experienced.
For achieving the above object and other relevant purposes, this utility model provides a kind of pulse width modulation control signal to adjust
Light control circuit, described pulse width modulation control signal adjusting control circuit includes: power control switching module, is used for controlling
The opening and closing of LED drive circuit；DIM control module, is used for receiving pulse width modulation control signal, adjusts in pulse width
When control signal processed is low level, output DIM_OFF signal is with power control switching module described in positive closing, in pulse width
When modulator control signal becomes high level, output DIM_ON signal is with power control switching module described in enforced opening.
Alternatively, described DIM_ON signal is the mono pulse control letter produced by pulse width modulation control signal rising edge
Number.
Alternatively, described DIM_ON signal carrys out power control switching mould described in enforced opening by LED constant current control module
Block.
Alternatively, described DIM_OFF signal is the inversion signal of pulse width modulation control signal.
Alternatively, described DIM_OFF signal controls to close zero electro-detection module simultaneously, and described zero electro-detection module is used for examining
Survey the system demagnetization time of LED drive system.
Alternatively, described pulse width modulation control signal is generated by wireless control system.
This utility model also provides for a kind of LED drive system, and described LED drive system includes pulse width as above
Modulator control signal adjusting control circuit.
Alternatively, described LED drive system also includes LED open-circuit-protection module, and described LED open-circuit-protection module is for working as
When the system demagnetization time that zero electro-detection module detection obtains is less than the described basis reference time, exports one and effectively initially open
Road protection signal；Described LED drive system also includes LED constant current control module, and described LED constant current control module is for when receiving
To described open-circuit-protection control circuit output open-circuit-protection signal time, control restarting of described power control switching module.
Alternatively, described LED drive system also includes energy-storage module, described energy-storage module and described power control switching mould
Block forms the power tube controlled stage of described LED drive system.
Alternatively, described power tube controlled stage includes Buck, any one power architecture in Buck-Boost, Flyback.
This utility model provides a kind of pulse width modulation control signal dimming controlling method, described pulse width modulation control
Signal dimming controlling method processed includes: receive pulse width modulation control signal, and according to pulse width modulation control signal
State generates corresponding signal to control the opening and closing of power control switching module；At pulse width modulation control signal it is
During low level, export DIM_OFF signal positive closing power control switching module；Become high at pulse width modulation control signal
During level, power control switching module described in output DIM_ON signal enforced opening.
As it has been described above, a kind of pulse width modulation control signal adjusting control circuit of the present utility model and LED drivetrain
System, has the advantages that when pwm signal is low level, exports DIM_OFF signal, positive closing power control switching
Module and zero current detection module.When pwm signal is high level, export DIM_ON signal, enforced opening power control switching
Module.The purpose of do so both avoided: 1, because power control switching module is by pwm signal positive closing, caused moving back of system
Magnetic time (Tdmeg) mistake less than basis reference time (Tovp), thus the LED in the triggering LED drive system of mistake opens
Road protection OVP；2, it is to avoid (when pwm signal is zero, power control switching module, by pwm signal positive closing, causes system
The demagnetization time (Tdmeg) shields the time (LEB) less than the detection of demagnetization signal or demagnetization signal ZXC can not be detected at all
Come, cause after pwm signal becomes high level, the problem that LED drive system can not open next cycle.Thus this practicality is new
The scheme of type improves the control mode of the pulse width modulating signal PWM control LED drive system of wireless control system output,
Breach pwm signal minimum high level time and minimum low level time can not be less than one switch periods of LED drive system
Limit, it is possible to achieve the real electrodeless control LED of pwm signal drives.
Accompanying drawing explanation
Fig. 1 is shown as the module diagram of an embodiment of the LED drive system of prior art.
Fig. 2 is shown as the signal sequence schematic diagram of an embodiment of the LED drive system of prior art.
Fig. 3 is shown as the module of an embodiment of pulse width modulation control signal dimming control system of the present utility model
Schematic diagram.
Fig. 4 is shown as the DIM of an embodiment of pulse width modulation control signal dimming control system of the present utility model
Control module principle schematic.
Fig. 5 is shown as the module diagram of an embodiment of LED drive system of the present utility model.
Fig. 6 is shown as the signal sequence schematic diagram of an embodiment of LED drive system of the present utility model.
Element numbers explanation
1 pulse width modulation control signal dimming control system
11 power control switching modules
12 DIM control modules
Detailed description of the invention
Below by way of specific instantiation, embodiment of the present utility model being described, those skilled in the art can be by this theory
Content disclosed by bright book understands other advantages of the present utility model and effect easily.This utility model can also be by additionally
Different detailed description of the invention is carried out or applies, the every details in this specification can also based on different viewpoints with should
With, under without departing from spirit of the present utility model, carry out various modification or change.
It should be noted that the diagram provided in the present embodiment illustrates basic structure of the present utility model the most in a schematic way
Think, the most graphic in component count time only display with relevant assembly in this utility model rather than is implemented according to reality, shape and
Size is drawn, and during its actual enforcement, the kenel of each assembly, quantity and ratio can be a kind of random change, and its assembly layout type
State is likely to increasingly complex.
To in prior art light modulation during, the reason easily causing LED flashing light is analyzed.In prior art
In, as it is shown in figure 1, LED drive system includes connecting the rectifier bridge filtration module of alternating voltage, energy-storage module, LED load, merit
Rate controls switch module, inductance peak value comparison method module, zero current detection module, LED open-circuit-protection module, and LED is permanent
Flow control module.Wherein alternating voltage is shaped to the DC voltage of an approximation, energy-storage module and merit by rectifier bridge filtration module
Rate controls switch module and forms the power tube controlled stage of whole system, wherein can include multiple power level framework, including Buck,
Buck-Boost, or flyback etc., wherein the inductor current signal in energy-storage module is IL.Inductance peak value comparison method mould
The function of block is to control the peak point current of inductance, by the current sense resistor in detection inductance peak value comparison method module
Voltage signal Vcs, and feed back peak-current signal CS_Peak.The function of zero electro-detection module is the demagnetization of detecting system
Point, when inductive current drop to zero reach de-magnetization point time, output demagnetization end signal ZXC and demagnetization time signal Tdmeg.
The function of LED open-circuit-protection module is the demagnetization time (Tdmeg) and basis reference zero electro-detection module exported
Time (Tovp) compares to realize LED open-circuit-protection, when the Tdemg time is less than Tovp, triggers LED open-circuit-protection, and LED opens a way
Protection module output signal is open-circuit-protection signal OVP.The function of LED constant current control module is to receive demagnetization end signal ZXC,
Peak-current signal CS_Peak, open-circuit-protection signal OVP, control signal Ngate of output power switch module, it is achieved
The current constant control of LED.At normal operation, whole control circuit is at peak-current signal CS_Peak and demagnetization end signal
Under the common effect of ZXC, it is achieved periodically control, the meansigma methods that LED load electric current is inductive current of output.
Due in randomness and the LED drive system of the pulse width modulation control signal PWM of wireless control system output
The independence that power control switching module opens and closes, particularly when the high level dutycycle of pwm signal is the biggest, PWM
Be zero time the least, the switch periods time of a typically smaller than system.Under specific circumstances, in prior art, LED drives
The signal sequence of dynamic control circuit will as in figure 2 it is shown, in fig. 2, and A point and B point LED drive system enter misoperation state,
And cause that LED flashing light occurs.Below A point and B point are occurred that the reason of misoperation state is analyzed.
At (A) point, when pwm signal is zero, power control switching module, by pwm signal positive closing, causes moving back of system
Magnetic time (Tdmeg) mistake less than basis reference time (Tovp), thus the LED in the triggering LED drive system of mistake opens
Road protection OVP, when the low level time width of pwm signal is more than the width of Tovp time, pwm signal can be when its low level
In, the OVP protection signal of mistake is reset, thus is not result in that LED flashing light occurs.I.e. OVP protection signal is at pwm signal
Low level interval produces and does not haves flashing light.If but the time that the pwm signal low level time is less than Tovp, i.e. OVP signal
The reset signal produced at pwm signal terminates to produce afterwards, and the OVP protection signal of mistake can cause LED flashing light.At (B) point,
When pwm signal is zero, power control switching module, by pwm signal positive closing, causes the demagnetization time (Tdmeg) of system to be less than
The detection of demagnetization signal shields the time (LEB) or demagnetization signal ZXC can not be detected at all, causes becoming at pwm signal
After becoming high level, LED drive system can not open next cycle, also results in and LED flashing light occurs.Due to above application limit
System, traditional PWM dimming control system requires that the minimum low level time of pwm signal and minimum high level time have to be larger than
One switch periods of LED drive system, is unable to realize real PWM non-pole light regulating and controls.
Analyzing according to above, this utility model provides a kind of pulse width modulation control signal adjusting control circuit.One
In individual embodiment, as it is shown on figure 3, described pulse width modulation control signal adjusting control circuit 1 includes power control switching mould
Block 11 and DIM control module 12.Wherein:
Power control switching module 11 is for controlling the opening and closing of LED drive circuit.
DIM control module 12 is connected with power control switching module 11, is used for receiving pulse width modulation control signal,
When pulse width modulation control signal is low level, output DIM_OFF signal with power control switching module described in positive closing,
When pulse width modulation control signal becomes high level, output DIM_ON signal is with power control switching mould described in enforced opening
Block.In one embodiment, described DIM_ON signal carrys out power control switching described in enforced opening by LED constant current control module
Module.In one embodiment, described DIM_OFF signal controls to close zero electro-detection module, described zero electro-detection module simultaneously
Demagnetize the time for detecting the system of LED drive system.Described pulse width modulation control signal is generated by wireless control system.
In one embodiment, as shown in Figure 4, described DIM_ON signal is to be produced by pulse width modulation control signal (PWM) rising edge
Raw mono pulse control signal, is produced circuit evolving by pulse.Described DIM_OFF signal is pulse width modulation control signal
(PWM) inversion signal.
This utility model also provides for a kind of LED drive system, and described LED drive system includes pulse width as above
Modulator control signal adjusting control circuit.Described LED drive system also includes LED open-circuit-protection module, described LED open-circuit-protection
Module is for when the system demagnetization time that zero electro-detection module detection obtains is less than the described basis reference time, and exporting one has
The initial open circuit protection signal of effect；Described LED drive system also includes LED constant current control module, described LED constant current control module
For when receiving the open-circuit-protection signal of described open-circuit-protection control circuit output, controlling described power control switching module
Restart.In one embodiment, described LED drive system also includes energy-storage module, described energy-storage module and described power control
Switch module processed forms the power tube controlled stage of described LED drive system.Described power tube controlled stage includes Buck, Buck-
Any one power architecture in Boost, Flyback.Buck framework uses Buck conversion circuit, is that a kind of output voltage is less than
It is input into the single tube not isolated DC translation circuit of voltage.Buck-Boost framework have employed step-down/up type translation circuit, is a kind of
Output voltage both can less than also can higher than being input into the single tube not isolated DC translation circuit of voltage, but the polarity of its output voltage with
It is input into voltage contrary.Buck/Boost changer can regard that Buck changer and Boost are in series as, incorporates out
Guan Guan.Flyback framework is during main switch turns on, and circuit only stores and do not transmits energy；During main switch turns off,
Just to a kind of circuit framework of load transmission energy.
In one embodiment, as it is shown in figure 5, described LED drive system includes the rectifier bridge filtering connecting alternating voltage
Module, energy-storage module, LED load, power control switching module, inductance peak value comparison method module, zero current detection module,
LED open-circuit-protection module, LED constant current control module and DIM control module.Wherein, DIM control module receives controlled in wireless system
The pulse width modulating signal (PWM) that sends of system also exports DIM_ON signal and DIM_OFF signal.Wherein DIM_OFF signal
Output is to power control switching module to close described power control switching module, and DIM_OFF signal exports zero electric-examination simultaneously
Survey module to control to close zero electro-detection module.DIM_ON signal exports LED constant current control module to control output Ngate letter
Number open power control switching module.
Described LED drive system A, B 2 corresponding signal sequential as shown in Figure 6.A point in figure 6, pulse width
The low level time of modulated signal PWM is much smaller than a switch periods of LED drive system.At pulse width modulating signal PWM
When becoming low level, power control switching module is closed in advance by pulse width modulating signal PWM, is not one within this cycle
Complete switch periods, causes the demagnetization time in this cycle to shorten.After pwm signal becomes high level, produce pwm signal
Raw DIM_ON signal meeting enforced opening power control switching module, produces and erroneous trigger without demagnetization signal ZXC by the time
OVP protects.Thus avoid demagnetization time (Tdmeg) mistake of LED drive system less than basis reference time (Tovp), and
The OVP that triggers of mistake protects signal.B point in figure 6, the low level time of pulse width modulating signal PWM is much smaller than LED
One switch periods of drive system.When pulse width modulating signal PWM becomes low level, power control switching module is by arteries and veins
The DIM_OFF rushing bandwidth modulation signals PWM generation closes in advance, and the time that power control switching module is opened is the shortest, at PWM
After signal becomes high level, zero current detection module can't detect the demagnetization signal of LED drive system, but by pwm signal
The DIM_ON meeting enforced opening power control switching module produced, enters directly into next normal switch periods.
In sum, a kind of pulse width modulation control signal adjusting control circuit of the present utility model and LED drivetrain
System, has the advantages that when pwm signal is low level, exports DIM_OFF signal, positive closing power control switching
Module and zero current detection module.When pwm signal is high level, export DIM_ON signal, enforced opening power control switching
Module.The purpose of do so both avoided: 1, because power control switching module is by pwm signal positive closing, caused moving back of system
Magnetic time (Tdmeg) mistake less than basis reference time (Tovp), thus the LED in the triggering LED drive system of mistake opens
Road protection OVP；2, it is to avoid (when pwm signal is zero, power control switching module, by pwm signal positive closing, causes system
The demagnetization time (Tdmeg) shields the time (LEB) less than the detection of demagnetization signal or demagnetization signal ZXC can not be detected at all
Come, cause after pwm signal becomes high level, the problem that LED drive system can not open next cycle.Thus this practicality is new
The scheme of type improves the control mode of the pulse width modulating signal PWM control LED drive system of wireless control system output,
Breach pwm signal minimum high level time and minimum low level time can not be less than one switch periods of LED drive system
Limit, it is possible to achieve the real electrodeless control LED of pwm signal drives.So, this utility model effectively overcomes of the prior art
Various shortcoming and have high industrial utilization.
Above-described embodiment only illustrative principle of the present utility model and effect thereof are new not for limiting this practicality
Type.Above-described embodiment all can be carried out by any person skilled in the art under spirit and the scope of the present utility model
Modify or change.Therefore, art has usually intellectual such as without departing from the essence disclosed in this utility model
All equivalences completed under god and technological thought are modified or change, and must be contained by claim of the present utility model.
Claims (10)
1. a pulse width modulation control signal adjusting control circuit, it is characterised in that described pulse width modulation controls letter
Number adjusting control circuit includes:
Power control switching module, for controlling the opening and closing of LED drive circuit；
DIM control module, is used for receiving pulse width modulation control signal, is low level at pulse width modulation control signal
Time, output DIM_OFF signal, with power control switching module described in positive closing, becomes high at pulse width modulation control signal
During level, output DIM_ON signal is with power control switching module described in enforced opening.
Pulse width modulation control signal adjusting control circuit the most according to claim 1, it is characterised in that: described DIM_
ON signal is the mono pulse control signal produced by pulse width modulation control signal rising edge.
Pulse width modulation control signal adjusting control circuit the most according to claim 1, it is characterised in that: described DIM_
ON signal carrys out power control switching module described in enforced opening by LED constant current control module.
Pulse width modulation control signal adjusting control circuit the most according to claim 1, it is characterised in that: described DIM_
OFF signal is the inversion signal of pulse width modulation control signal.
Pulse width modulation control signal adjusting control circuit the most according to claim 1, it is characterised in that: described DIM_
OFF signal controls to close zero electro-detection module simultaneously, and described zero electro-detection module is for detecting the system demagnetization of LED drive system
Time.
Pulse width modulation control signal adjusting control circuit the most according to claim 1, it is characterised in that: described pulse
Width modulated control signal is generated by wireless control system.
7. a LED drive system, it is characterised in that: described LED drive system includes such as right arbitrary in claim 1 to 6
Pulse width modulation control signal adjusting control circuit described in requirement.
LED drive system the most according to claim 7, it is characterised in that: described LED drive system also includes that LED opens a way
Protection module, described LED open-circuit-protection module is for when the system demagnetization time that zero electro-detection module detection obtains is less than described
During the basis reference time, export an effective initial open circuit protection signal；Described LED drive system also includes LED constant current control
Molding block, described LED constant current control module is for when the open-circuit-protection signal receiving the output of described open-circuit-protection control circuit
Time, control restarting of described power control switching module.
LED drive system the most according to claim 7, it is characterised in that: described LED drive system also includes energy storage mould
Block, described energy-storage module and described power control switching module form the power tube controlled stage of described LED drive system.
LED drive system the most according to claim 9, it is characterised in that: described power tube controlled stage includes Buck,
Any one power architecture in Buck-Boost, Flyback.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620623194.5U CN205830092U (en) | 2016-06-22 | 2016-06-22 | A kind of pulse width modulation control signal adjusting control circuit and LED drive system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620623194.5U CN205830092U (en) | 2016-06-22 | 2016-06-22 | A kind of pulse width modulation control signal adjusting control circuit and LED drive system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205830092U true CN205830092U (en) | 2016-12-21 |
Family
ID=58146950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620623194.5U Withdrawn - After Issue CN205830092U (en) | 2016-06-22 | 2016-06-22 | A kind of pulse width modulation control signal adjusting control circuit and LED drive system |
Country Status (1)
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| CN (1) | CN205830092U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106413173A (en) * | 2016-06-22 | 2017-02-15 | 上海晶丰明源半导体有限公司 | Pulse width modulation control signal light modulation control circuit and method, and LED driving system |
-
2016
- 2016-06-22 CN CN201620623194.5U patent/CN205830092U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106413173A (en) * | 2016-06-22 | 2017-02-15 | 上海晶丰明源半导体有限公司 | Pulse width modulation control signal light modulation control circuit and method, and LED driving system |
| CN106413173B (en) * | 2016-06-22 | 2018-06-29 | 上海晶丰明源半导体股份有限公司 | A kind of pulse width modulation control signal adjusting control circuit, control method and LED drive system |
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| GR01 | Patent grant | ||
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Address after: 5 room 504-511, room 2, Lane 666, Zhang Heng Road,, China (Shanghai) free trade zone, Shanghai Patentee after: Shanghai semiconducto Limited by Share Ltd Address before: 201203 Shanghai Zhang Heng Road, Lane 666, No. 2, No. 5, Pudong New Area Patentee before: Shanghai Bright Power Semiconductor Co.,Ltd. |
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Granted publication date: 20161221 Effective date of abandoning: 20180629 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20161221 Effective date of abandoning: 20180629 |