CN106413173B - A kind of pulse width modulation control signal adjusting control circuit, control method and LED drive system - Google Patents
A kind of pulse width modulation control signal adjusting control circuit, control method and LED drive system Download PDFInfo
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- CN106413173B CN106413173B CN201610459744.9A CN201610459744A CN106413173B CN 106413173 B CN106413173 B CN 106413173B CN 201610459744 A CN201610459744 A CN 201610459744A CN 106413173 B CN106413173 B CN 106413173B
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- width modulation
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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]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
-
- 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
The present invention provides a kind of pulse width modulation control signal adjusting control circuit, control method and LED drive system.Wherein, the 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 modules, for receiving pulse width modulation control signal, when pulse width modulation control signal is low level, DIM_OFF signals are exported with power control switching module described in positive closing, when pulse width modulation control signal becomes high level, output DIM_ON signals are with power control switching module described in enforced opening.The solution of the present invention had both avoided mistake and has entered OVP patterns, the problem of also avoiding to detect demagnetization signal and cannot be introduced into next switch periods, can realize pwm signal really electrodeless control LED drivings.
Description
Technical field
The present invention relates to a kind of LED control fields, more particularly to a kind of pulse width modulation control signal brightness adjustment control
Circuit, control method and LED drive system.
Background technology
As country is advocated energetically energy-saving and environment-friendly, LED illumination has green, energy saving, environmental protection as a kind of new technology
The characteristics of and be widely popularized.With the deep development of LED lighting technology, the demand of various intelligent lighting controls is more and more,
It is dimmed including switch on wall or using 2.4G, bluetooth, zigbee, wifi, the intelligent lighting of the wireless control such as infrared is in
The eve of explosion type development.The development of these intelligent lighting demands also requires the LED drive control circuits for LED illumination simultaneously
These wireless control modules can be compatible with, can realize the demand of various intelligent dimmings.One typically carries wireless controller
Intelligent LED lighting system include：Two big module of wireless control system and LED drive system, wherein wireless control system according to
The control of user, output pulse width modulation control signal (PWM) dim LED to LED drive system.Traditional pulse
Width modulated control signal (PWM) realizes that the principle of light modulation is：When PWM is high level, LED drive system normal work, when
When PWM is low level, PWM positive closing power control switching modules, LED drive system is stopped.Existing LED drives at present
Dynamic control circuit is difficult that can be compatible with the control of various intelligent wireless controllers, during light modulation, be easy to cause LED sudden strains of a muscle
Lamp or real non-pole light regulating is can not achieve, bad light modulation is caused to experience to client.
In consideration of it, how to find a kind of pulse width modulation control signal brightness adjustment control that experience is preferably dimmed to client
Scheme is just into those skilled in the art's urgent problem to be solved.
Invention content
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of pulse width modulation control letters
Number adjusting control circuit, control method and LED drive system, for solving existing LED drive control circuits in the prior art
The problem of during light modulation, be easy to causeing LED flashing lights, bad light modulation caused to experience to client.
In order to achieve the above objects and other related objects, the present invention provides a kind of pulse width modulation control signal light modulation control
Circuit processed, the pulse width modulation control signal adjusting control circuit include：Power control switching module, for controlling LED
The opening and closing of driving circuit；DIM control modules for receiving pulse width modulation control signal, are modulated in pulse width
When controlling signal as low level, output DIM_OFF signals are with power control switching module described in positive closing, in pulse width tune
When system control signal becomes high level, output DIM_ON signals are with power control switching module described in enforced opening.
Optionally, the DIM_ON signals are to be believed by the mono pulse control that pulse width modulation control signal rising edge generates
Number.
Optionally, the DIM_ON signals by LED constant current control module come power control switching mould described in enforced opening
Block.
Optionally, the DIM_OFF signals are the inversion signal of pulse width modulation control signal.
Optionally, the DIM_OFF signals control simultaneously closes zero electro-detection module, and the zero electro-detection module is used to examine
Survey the system demagnetization time of LED drive system.
Optionally, the pulse width modulation control signal is generated by wireless control system.
The present invention also provides a kind of LED drive system, the LED drive system is modulated including pulse width as described above
Control signal adjusting control circuit.
Optionally, the LED drive system further includes LED open-circuit-protection modules, and the LED open-circuit-protections module is used to work as
When the system demagnetization time that zero electro-detection module detects is less than the reference data time, the effective initial open circuit of output one is protected
Protect signal；The LED drive system further includes LED constant current control module, and the LED constant current control module, which is used to work as, receives institute
When stating the open-circuit-protection signal of LED open-circuit-protections module output, restarting for the power control switching module is controlled.
Optionally, the LED drive system further includes energy-storage module, the energy-storage module and the power control switching mould
Block forms the power tube controlled stage of the LED drive system.
Optionally, the power tube controlled stage includes Buck, any one of Buck-Boost, Flyback power architecture.
The present invention provides a kind of pulse width modulation control signal dimming controlling method, the pulse width modulation control letter
Number dimming controlling method includes：Pulse width modulation control signal is received, and according to the state of pulse width modulation control signal
Corresponding signal is generated to control the opening and closing of power control switching module；It is low electricity in pulse width modulation control signal
Usually, DIM_OFF signal positive closing power control switching modules are exported；Become high level in pulse width modulation control signal
When, export power control switching module described in DIM_ON signal enforced openings.
As described above, a kind of pulse width modulation control signal adjusting control circuit of the present invention, control method and LED drive
Dynamic system, has the advantages that：When pwm signal is low level, DIM_OFF signals, positive closing power control are exported
Switch module and zero current detection module.When pwm signal is high level, DIM_ON signals, enforced opening power control are exported
Switch module.The purpose done so both avoided：1, because power control switching module is by pwm signal positive closing, lead to system
Demagnetization time (Tdmeg) mistake be less than the reference data time (Tovp), so as to mistake triggering LED drive system in
LED open-circuit-protections OVP；2, when to avoid pwm signal be zero, power control switching module by pwm signal positive closing, cause be
Detection shielding time (LEB) of the demagnetization time (Tdmeg) of system less than demagnetization signal or demagnetization signal ZXC cannot be detected at all
It measures and, cause after pwm signal becomes high level, the problem of LED drive system cannot open next cycle.Thus this hair
Bright scheme improves the control mode of the pulse width modulating signal PWM control LED drive systems of wireless control system output,
One switch periods of LED drive system cannot be less than by breaching pwm signal minimum high level time and minimum low level time
Limitation can realize pwm signal really electrodeless control LED drivings.
Description of the drawings
Fig. 1 is shown as the module diagram of an embodiment of the LED drive system of the prior art.
Fig. 2 is shown as the signal sequence schematic diagram of an embodiment of the LED drive system of the prior art.
Fig. 3 is shown as the module signal of an embodiment of the pulse width modulation control signal dimming control system of the present invention
Figure.
Fig. 4 is shown as the DIM controls of an embodiment of the pulse width modulation control signal dimming control system of the present invention
Module principle schematic diagram.
Fig. 5 is shown as the module diagram of an embodiment of the LED drive system of the present invention.
Fig. 6 is shown as the signal sequence schematic diagram of an embodiment of the LED drive system of the present invention.
Fig. 7 is shown as the flow signal of an embodiment of the pulse width modulation control signal dimming controlling method of the present invention
Figure.
Component label instructions
1 pulse width modulation control signal dimming control system
11 power control switching modules
12 DIM control modules
S1~S2 steps
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Disclosed content understands other advantages and effect of the present invention easily.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also be based on different viewpoints with application, without departing from
Various modifications or alterations are carried out under the spirit of the present invention.
It should be noted that the diagram provided in the present embodiment only illustrates the basic conception of the present invention in a schematic way,
Then in schema only display with it is of the invention in related component rather than component count, shape and size during according to actual implementation paint
System, kenel, quantity and the ratio of each component can be a kind of random change, and its assembly layout kenel also may be used during actual implementation
It can be increasingly complex.
The reason of to during light modulation, be easy to causeing LED flashing lights in the prior art, is analyzed.In the prior art
In, as shown in Figure 1, LED drive system includes rectifier bridge filter module, energy-storage module, LED load, the work(of connection alternating voltage
Rate control switch module, inductance peak value comparison method module, zero current detection module, LED open-circuit-protections module and LED are permanent
Flow control module.Wherein alternating voltage is shaped to an approximate DC voltage, energy-storage module and work(by rectifier bridge filter module
Rate control switch module forms the power tube controlled stage of whole system, wherein multiple power level framework can be included, including Buck,
Inductor current signal in Buck-Boost or flyback etc., wherein 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 detecting on inductance peak value comparison method mould current sense resistor in the block
Voltage signal Vcs, and feed back a peak-current signal CS_Peak.The function of zero electro-detection module is the demagnetization of detecting system
Point, when inductive current, which falls to zero, reaches de-magnetization point, output demagnetization end signal ZXC and demagnetization time signal Tdmeg.
The function of LED open-circuit-protection modules is the demagnetization time (Tdmeg) and reference data for exporting zero electro-detection module
Time (Tovp) compares to realize LED open-circuit-protections, when the Tdemg times being less than Tovp, triggers LED open-circuit-protections, LED open circuits
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, the control signal Ngate of output power switch module are realized
The current constant control of LED.In normal work, entire control circuit is in peak-current signal CS_Peak and demagnetization end signal
Under the collective effect of ZXC, the control of property performance period, the LED load electric current of output is the average value of inductive current.
Due in the randomness and 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 duty ratio of pwm signal is very big, PWM
The time for being zero is very small, the switch periods time of usually less than one system.Under specific circumstances, LED drives in the prior art
The signal sequence of dynamic control circuit will as shown in Fig. 2, in fig. 2, A points and B point LED drive systems enter misoperation state,
And lead to LED flashing lights occur.The reason of appearance misoperation state of A points and B points, is analyzed below.
In (A) point, when pwm signal is zero, power control switching module leads to moving back for system by pwm signal positive closing
Magnetic time (Tdmeg) mistake is less than the reference data time (Tovp), so as to which the LED in the triggering LED drive system of mistake is opened
OVP is protected on road, and when the low level time width of pwm signal is more than the width of Tovp times, pwm signal can be in its low level
In, the OVP protection signals of mistake are reset, so as to lead to LED flashing lights occur.That is OVP protection signals are in pwm signal
It is not in flashing light that low level section, which generates,.But if the pwm signal low level time is less than the time of Tovp, i.e. OVP signals
The reset signal generated in pwm signal generates after terminating, and the OVP protection signals of mistake can lead to LED flashing lights.In (B) point,
When pwm signal is zero, power control switching module causes the demagnetization time (Tdmeg) of system to be less than by pwm signal positive closing
Detection shielding time (LEB) of demagnetization signal or demagnetization signal ZXC cannot be detected at all, cause to become in pwm signal
Into after high level, LED drive system cannot open next cycle, also result in and LED flashing lights occur.Due to above application limit
System, the minimum low level time and minimum high level time of traditional PWM dimming control systems requirement pwm signal have to be larger than
One switch periods of LED drive system, therefore can not realize real PWM non-pole light regulatings control.
According to above analysis, the present invention provides a kind of pulse width modulation control signal adjusting control circuit.In a reality
It applies in example, as shown in figure 3, the pulse width modulation control signal adjusting control circuit 1 includes power control switching module 11
And DIM control modules 12.Wherein：
Power control switching module 11 is used to control the opening and closing of LED drive circuit.DIM control modules 12 and power
Switch module 11 is controlled to be connected, is low electricity in pulse width modulation control signal for receiving pulse width modulation control signal
Usually, output DIM_OFF signals are become with power control switching module described in positive closing in pulse width modulation control signal
During high level, output DIM_ON signals are with power control switching module described in enforced opening.In one embodiment, the DIM_
ON signals are by LED constant current control module come power control switching module described in enforced opening.In one embodiment, it is described
DIM_OFF signals control simultaneously closes zero electro-detection module, and the zero electro-detection module is used for the system for detecting LED drive system
It demagnetizes the time.The pulse width modulation control signal is generated by wireless control system.In one embodiment, as shown in figure 4,
The DIM_ON signals are the mono pulse control signal generated by pulse width modulation control signal (PWM) rising edge, by simple venation
Rush generation circuit generation.The DIM_OFF signals are the inversion signal of pulse width modulation control signal (PWM).
The present invention also provides a kind of LED drive system, the LED drive system is modulated including pulse width as described above
Control signal adjusting control circuit.The LED drive system further includes LED open-circuit-protection modules, the LED open-circuit-protections module
When the system demagnetization time for being detected when zero electro-detection module is less than the reference data time, one is exported effectively
Initial open circuit protection signal；The LED drive system further includes LED constant current control module, and the LED constant current control module is used for
When the open-circuit-protection signal for receiving the LED open-circuit-protections module output, the weight of the power control switching module is controlled
It opens.In one embodiment, the LED drive system further includes energy-storage module, and the energy-storage module is opened with the power control
Close the power tube controlled stage that module forms the LED drive system.The power tube controlled stage includes Buck, Buck-Boost,
Any one of Flyback power architectures.Buck frameworks use Buck conversion circuit, be a kind of output voltage be less than be input into electricity
The single tube of pressure not isolated DC translation circuit.Buck-Boost frameworks employ step-down/up type translation circuit, are a kind of output electricity
Pressure can both be less than or higher than the single tube not isolated DC translation circuit, but the polarity of its output voltage is with being input into electricity for being input into voltage
Pressure is opposite.Buck/Boost converters can regard that Buck converters and Boost are connected in series as, incorporate switching tube.
During main switch is connected, circuit is only stored without transmitting energy Flyback frameworks；Main switch turn off during, just to
A kind of circuit framework of energy is transmitted in load.
In one embodiment, as shown in figure 5, the LED drive system includes the rectifier bridge filtering of connection 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 modules, LED constant current control module and DIM control modules.Wherein, DIM control modules receive wireless control system
It unites and the pulse width modulating signal (PWM) that sends out and exports DIM_ON signals and DIM_OFF signals.Wherein DIM_OFF signals
Power control switching module is output to close the power control switching module, while DIM_OFF signals are output to zero electric-examination
It surveys module and closes zero electro-detection module to control.DIM_ON signals are output to LED constant current control module to control output Ngate letters
Number open power control switching module.
Corresponding signal sequential of the LED drive system in 2 points of A, B is as shown in Figure 6.A points in figure 6, pulse width
The low level time of modulated signal PWM is much smaller than a switch periods of LED drive system.In 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 period
Complete switch periods, lead to the demagnetization time in this period can shorten.After pwm signal becomes high level, produced by pwm signal
Raw DIM_ON signals meeting enforced opening power control switching module, without waiting until that demagnetization signal ZXC is generated and erroneous trigger
OVP is protected.So as to avoid demagnetization time (Tdmeg) mistake of LED drive system be less than the reference data time (Tovp), and
Mistake triggers OVP protection signals.B points in figure 6, the low level time of pulse width modulating signal PWM are 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 for rushing bandwidth modulation signals PWM generations is closed in advance, and the time that power control switching module is opened is very short, in 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 modules of generation, enter directly into next normal switch periods.
The present invention provides a kind of pulse width modulation control signal dimming controlling method.In one embodiment, such as Fig. 7 institutes
Show, the pulse width modulation control signal dimming controlling method includes：
Step S11 receives pulse width modulation control signal, and is generated according to the state of pulse width modulation control signal
Corresponding signal is to control the opening and closing of power control switching module.
Step S12 when pulse width modulation control signal is low level, exports DIM_OFF signal positive closing power
Control switch module；When pulse width modulation control signal becomes high level, work(described in DIM_ON signal enforced openings is exported
Rate controls switch module.
The pulse width modulation control signal dimming controlling method is when pwm signal is low level, output DIM_OFF letters
Number, positive closing power tube control switch module and zero current detection module.When pwm signal is high level, DIM_ON is exported
Signal, enforced opening power control switching module.The purpose done so both avoided (A points) mistake and enters OVP patterns, also avoided
The problem of (B points) cannot detect demagnetization signal and cannot be introduced into next switch periods.Thus it can realize the electrodeless tune of PWM
Photocontrol.
In conclusion a kind of pulse width modulation control signal adjusting control circuit of the present invention, control method and LED drive
Dynamic system, has the advantages that：When pwm signal is low level, DIM_OFF signals, positive closing power control are exported
Switch module and zero current detection module.When pwm signal is high level, DIM_ON signals, enforced opening power control are exported
Switch module.The purpose done so both avoided：1, because power control switching module is by pwm signal positive closing, lead to system
Demagnetization time (Tdmeg) mistake be less than the reference data time (Tovp), so as to mistake triggering LED drive system in
LED open-circuit-protections OVP；2, when to avoid pwm signal be zero, power control switching module by pwm signal positive closing, cause be
Detection shielding time (LEB) of the demagnetization time (Tdmeg) of system less than demagnetization signal or demagnetization signal ZXC cannot be detected at all
It measures and, cause after pwm signal becomes high level, the problem of LED drive system cannot open next cycle.Thus this hair
Bright scheme improves the control mode of the pulse width modulating signal PWM control LED drive systems of wireless control system output,
One switch periods of LED drive system cannot be less than by breaching pwm signal minimum high level time and minimum low level time
Limitation can realize pwm signal really electrodeless control LED drivings.So the present invention effectively overcome it is of the prior art various
Shortcoming and have high industrial utilization.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all can carry out modifications and changes under the spirit and scope without prejudice to the present invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete without departing from disclosed spirit and institute under technological thought such as
Into all equivalent modifications or change, should by the present invention claim be covered.
Claims (10)
- A kind of 1. pulse width modulation control signal adjusting control circuit, which is characterized in that the pulse width modulation control letter Number adjusting control circuit includes：Power control switching module, for controlling the opening and closing of LED drive circuit；DIM control modules are low level in pulse width modulation control signal for receiving pulse width modulation control signal When, output DIM_OFF signals become high with power control switching module described in positive closing in pulse width modulation control signal During level, output DIM_ON signals are with power control switching module described in enforced opening.
- 2. pulse width modulation control signal adjusting control circuit according to claim 1, it is characterised in that：The DIM_ ON signals are the mono pulse control signal generated by pulse width modulation control signal rising edge.
- 3. pulse width modulation control signal adjusting control circuit according to claim 1, it is characterised in that：The DIM_ ON signals are by LED constant current control module come power control switching module described in enforced opening.
- 4. pulse width modulation control signal adjusting control circuit according to claim 1, it is characterised in that：The DIM_ OFF signal is the inversion signal of pulse width modulation control signal.
- 5. pulse width modulation control signal adjusting control circuit according to claim 1, it is characterised in that：The DIM_ OFF signal controls simultaneously closes zero electro-detection module, and the zero electro-detection module is used to detect the system demagnetization of LED drive system Time.
- 6. pulse width modulation control signal adjusting control circuit according to claim 1, it is characterised in that：The pulse Width modulated control signal is generated by wireless control system.
- 7. a kind of LED drive system, it is characterised in that：The LED drive system is included such as any right in claim 1 to 6 It is required that the pulse width modulation control signal adjusting control circuit.
- 8. LED drive system according to claim 7, it is characterised in that：The LED drive system further includes LED open circuits Protection module, the LED open-circuit-protections module are used to be less than reference when the system demagnetization time that zero electro-detection module detects During fiducial time, an effective initial open circuit protection signal is exported；The LED drive system further includes LED constant current control mould Block, the LED constant current control module are used for when the open-circuit-protection signal for receiving the LED open-circuit-protections module output, control Make restarting for the power control switching module.
- 9. LED drive system according to claim 7, it is characterised in that：The LED drive system further includes energy storage mould Block, the energy-storage module form the power tube controlled stage of the LED drive system with the power control switching module.
- 10. a kind of pulse width modulation control signal dimming controlling method, it is characterised in that：The pulse width modulation control letter Number dimming controlling method includes：Receive pulse width modulation control signal, and according to the state of pulse width modulation control signal generate corresponding signal with Control the opening and closing of power control switching module；When pulse width modulation control signal is low level, DIM_OFF signal positive closing power control switching modules are exported； When pulse width modulation control signal becomes high level, power control switching mould described in DIM_ON signal enforced openings is exported Block.
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| CN105392231A (en) * | 2015-12-03 | 2016-03-09 | 昂宝电子（上海）有限公司 | System for providing output current for one or multiple LED |
| CN205830092U (en) * | 2016-06-22 | 2016-12-21 | 上海晶丰明源半导体有限公司 | A kind of pulse width modulation control signal adjusting control circuit and LED drive system |
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| US9107257B2 (en) * | 2011-02-24 | 2015-08-11 | Osram Sylvania Inc. | Adaptive frequency control to change a light output level |
| CN102143639A (en) * | 2011-04-18 | 2011-08-03 | 鸿富锦精密工业（深圳）有限公司 | LED (Light Emitting Diode) driving circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105392231A (en) * | 2015-12-03 | 2016-03-09 | 昂宝电子（上海）有限公司 | System for providing output current for one or multiple LED |
| CN205830092U (en) * | 2016-06-22 | 2016-12-21 | 上海晶丰明源半导体有限公司 | A kind of pulse width modulation control signal adjusting control circuit and LED drive system |
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