CN105722278A - Control circuit and control method for improving LED dimming performance, and LED driving system - Google Patents
Control circuit and control method for improving LED dimming performance, and LED driving system Download PDFInfo
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- CN105722278A CN105722278A CN201610221479.0A CN201610221479A CN105722278A CN 105722278 A CN105722278 A CN 105722278A CN 201610221479 A CN201610221479 A CN 201610221479A CN 105722278 A CN105722278 A CN 105722278A
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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]
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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
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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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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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
The invention provides an open circuit protection control circuit and a control method for improving an LED dimming performance, and an LED driving system. The open circuit protection control circuit for improving the LED dimming performance comprises an LED open circuit protection module, an inductance current control module and a synchronous control module, wherein the LED open circuit protection module is used for comparing a system demagnetizing time signal with a reference time signal, and outputting an effective initial open circuit protection signal when the system demagnetizing time signal is less than the reference time signal; the inductance current control module is used for detecting the inductance current value of the system, and outputting a current control signal when the inductance current value is greater than a set threshold value; and the synchronous control module is used for controlling an open circuit enabling signal to be ineffective after a set time when the system demagnetizing time signal is received, controlling the open circuit enabling signal to be effective when the current control signal is received, and outputting an open circuit protection signal when the initial open circuit protection signal and the open circuit enabling signal are effective synchronously. By adoption of the open circuit protection control circuit, the LED flashing light can be avoided.
Description
Technical field
The present invention relates to a kind of LED control field, particularly relate to a kind of improve the control circuit of LED dimming behavior, control method 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, the feature of environmental protection and be widely popularized.The intelligent lighting of the controlled in wireless such as along with the deep development of LED illumination technology, the demand of various intelligent lighting controls gets more and more, and dims including switch on wall, or adopts 2.4G, bluetooth, zigbee, wifi, infrared is in the eve of explosion type development.The development of these intelligent lighting demands also requires that the LED for LED illumination drives the control circuit can these wireless control modules compatible simultaneously, it is possible to realize the demand of various intelligent dimming.Current existing LED drive control circuit be difficult to can the control of compatible various intelligent wireless controllers, in the process of light modulation, it is easy to cause LED flashing light, client causes very bad light modulation experience.
In consideration of it, how to determine the reason causing LED to glisten and find the effective scheme solving LED flash of light just to become those skilled in the art's problem demanding prompt solution.
Summary of the invention
The shortcoming of prior art in view of the above, it is an object of the invention to provide and a kind of improve the control circuit of LED dimming behavior, control method and LED drive system, for solve in prior art various intelligent wireless controllers control light modulation process in, it is easy to the problem causing LED flashing light.
For achieving the above object and other relevant purposes; the present invention provides a kind of open-circuit-protection control circuit improving LED dimming behavior; the open-circuit-protection control circuit of the described LED of improvement dimming behavior includes: LED open-circuit-protection module; described LED open-circuit-protection module compares with basis reference time signal for time signal that system is demagnetized; when system demagnetize the time less than the basis reference time time, export one effective initial open circuit and protects signal；Inductive current controls module, for detecting the inductor current value of system, when described inductor current value is more than when setting threshold value, exports a current controling signal；Synchronization control module, for when receiving system demagnetization end signal, after the setting time, controlling open circuit and enabling invalidating signal；When receiving described current controling signal, control described open circuit enable signal effective；Time when described initial open circuit protection signal and described open circuit enable signal while effectively, export an open-circuit-protection signal.
Alternatively, described synchronization control module includes the rest-set flip-flop that a high level triggers, described system demagnetization end signal is input to the R end of described rest-set flip-flop after delay circuit, described current controling signal is input to the S end of described rest-set flip-flop, and the Q end output open circuit of described rest-set flip-flop enables signal.
Alternatively, described synchronization control module includes one and door, and described initial open circuit protection signal and described open circuit enable signal and input described two inputs with door respectively, and the described outfan output open circuit with door protects signal.
Alternatively, the described threshold value that sets as K times of peak current value, 0 < K≤1.
The present invention provides a kind of LED drive system, and described LED drive system includes the open-circuit-protection control circuit improving LED dimming behavior as above.
Alternatively, described LED drive system also includes LED constant current and controls module, and described LED constant current controls module for when receiving the open-circuit-protection signal of described open-circuit-protection control circuit output, and the power supply of described LED drive system is restarted.
Alternatively, described LED drive system is additionally operable to receive pulse width modulating signal, when the pulse width modulating signal received is high level, and described LED drive system normal operation；When the pulse width modulating signal received is low level, described LED drive system quits work.
Alternatively, described pulse width modulating signal is generated by wireless control system.
The present invention provides a kind of open-circuit-protection control method improving LED dimming behavior; the open-circuit-protection control method of the described LED of improvement dimming behavior includes: the inductor current value of detection system; when described inductor current value is more than setting value, control open circuit enable signal effective；When system demagnetization end signal being detected, after the setting time, controlling described open circuit and enabling invalidating signal；When system demagnetize the time less than the basis reference time time, produces one effective initial open circuit and protects signal；When enabling effective while of signal and described initial open circuit protection signal when described open circuit, produce an open-circuit-protection signal.
Alternatively, the open-circuit-protection control method of the described LED of improvement dimming behavior also includes: described open-circuit-protection signal controls the power supply of LED and restarts.
As mentioned above; the a kind of of the present invention improves the control circuit of LED dimming behavior, control method and LED drive system; have the advantages that and can effectively reduce or avoid the LED open-circuit-protection signal in LED drive system by false triggering, thus avoiding because LED open-circuit-protection signal error triggers the LED flashing light caused.
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 waveform schematic diagram of an embodiment of the LED drive system of prior art.
Fig. 3 is shown as the module diagram of an embodiment of the control circuit improving LED dimming behavior of the present invention.
Fig. 4 is shown as the circuit theory schematic diagram of the synchronization control module of an embodiment of the control circuit improving LED dimming behavior of the present invention.
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 waveform schematic diagram of an embodiment of the LED drive system of the present invention.
Fig. 7 is shown as the schematic flow sheet of an embodiment of the control method improving LED dimming behavior of the present invention.
Element numbers explanation
1 control improving LED dimming behavior
Circuit
11LED open-circuit-protection module
12 inductive currents control module
13 synchronization control module
S1～S4 step
Detailed description of the invention
By particular specific embodiment, embodiments of the present invention being described below, those skilled in the art the content disclosed by this specification can understand other advantages and effect of the present invention easily.
Notice, the structure of this specification institute accompanying drawings depicted, ratio, size etc., all only in order to coordinate the disclosed content of description, understand for those skilled in the art and read, it is not limited to the enforceable qualifications of the present invention, therefore do not have technical essential meaning, the adjustment of the modification of any structure, the change of proportionate relationship or size, under not affecting effect that the present invention can be generated by and the purpose that can reach, all should still drop in the scope that disclosed technology contents can be contained.Simultaneously, in this specification cited as " on ", D score, "left", "right", " centre " and " one " etc. term, it is merely convenient to understanding of narration, and it is not used to limit the enforceable scope of the present invention, the change of its relativeness or adjustment, changing under technology contents without essence, when being also considered as the enforceable category of the present invention.
As shown in Figure 1, one typical Intelligent LED lighting system with wireless controller includes: wireless control system and the big module of LED drive system two, the wherein wireless control system control according to user, LED, to LED drive system, is dimmed by output pulse width modulator control signal (PWM).Pulse width modulation control signal (PWM) realizes the principle of light modulation: when PWM is high level, LED drive system normal operation, and when PWM is low level, PWM closes grid and drives signal Ngate, and LED drive system quits work.
LED drive system includes connecting the rectifier bridge filtration module of alternating voltage, energy-storage module, LED load, power control switching module, inductance peak value comparison method module, LED open-circuit-protection module, zero current detection module and LED constant current and controls module.
Wherein alternating voltage is shaped to an approximate DC voltage by rectifier bridge filtration module, energy-storage module and power control switching module form 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.The function of inductance peak value comparison method module is to control the peak point current of inductance, by detecting the voltage signal Vcs on the current sense resistor in inductance peak value comparison method module, and feeds back a peak-current signal CS_Peak.The function of zero electro-detection module is the de-magnetization point of detection system, when inductive current drop to zero reach de-magnetization point time, output demagnetization end signal ZXC and system demagnetization time signal Tdmeg.
The function of LED open-circuit-protection module is to compare system demagnetization time (Tdmeg) of zero electro-detection module output with the basis reference time (Tovp) to realize LED open-circuit-protection, and main output signal is open-circuit-protection signal OVP.It is receive demagnetization end signal ZXC that LED constant current controls the function of module; peak-current signal CS_Peak, open-circuit-protection signal OVP, and pulse width modulating signal PWM; the control signal Ngate of output power switch module, it is achieved the current constant control of LED and switch dimming control.LED constant current control module compares open-circuit-protection reference time signal Tovp and demagnetization time signal Tdemg simultaneously, carries out the open-circuit-protection of system.When normal operation, it is operated in demagnetization time Tdmeg=(the L*Ipk)/Vled of critical current mode pattern or the LED drive system of discontinuous mode.Wherein Vled represents that load voltage, Ipk represent the peak point current of the inductance in energy-storage module, and L represents the inductance value in energy-storage module.When load voltage Vled is constant; the demagnetization time of system is also to maintain constant; when load voltage Vled raises; synchronization is diminished by the demagnetization time (Tdmeg) of system, and therefore LED constant current is controlled module and can be compared with the basis reference time (Tovp) by demagnetization time (Tdmeg) of comparison system and realize LED open-circuit-protection.
As in figure 2 it is shown, wherein, the pulse width modulation control signal PWM exported due to wireless control system drives randomness and the independence of signal Ngate with the grid of LED control circuit module output in LED drive system to signal waveform in above-mentioned LED drive system.Cause A point in fig. 2 and B point, grid drive signal Ngate can be closed in advance by pulse width modulating signal PWM, cause system demagnetization time (Tdmeg) mistake less than basis reference time (Tovp).Thus the LED open-circuit-protection OVP in the triggering LED drive system of mistake.OVP signal controls LED drive system and restarts LED power, thus causing LED flashing light occur.
For the LED flashing light that the erroneous trigger of open-circuit-protection signal causes, the present invention provides a kind of open-circuit-protection control circuit improving LED dimming behavior, improves the open-circuit-protection control circuit of LED dimming behavior for lowering or avoid the open-circuit-protection signal of mistake generation.As it is shown on figure 3, the open-circuit-protection control circuit of the described LED of improvement dimming behavior includes LED open-circuit-protection module 11, inductive current controls module 12 and synchronization control module 13.Wherein:
LED open-circuit-protection module 11 compares with basis reference time signal for time signal that system is demagnetized, when system demagnetize the time less than the basis reference time time, export one effective initial open circuit and protects signal.
Inductive current controls module 12 for detecting the inductor current value of system, when described inductor current value is more than when setting threshold value, exports a current controling signal.The described threshold value that sets is as K times of peak current value, wherein, and 0 < K≤1.
Synchronization control module 13 controls module 12 with LED open-circuit-protection module 11 and inductive current and is connected, for when receiving system demagnetization end signal, after the setting time, controlling open circuit and enabling invalidating signal；When receiving described current controling signal, control described open circuit enable signal effective；Time when described initial open circuit protection signal and described open circuit enable signal while effectively, export an open-circuit-protection signal.In one embodiment, described synchronization control module includes the rest-set flip-flop that a high level triggers, described system demagnetization end signal is input to the R end of described rest-set flip-flop after delay circuit, described current controling signal is input to the S end of described rest-set flip-flop, and the Q end output open circuit of described rest-set flip-flop enables signal.Described synchronization control module includes one and door, and described initial open circuit protection signal and described open circuit enable signal and input described two inputs with door respectively, and the described outfan output open circuit with door protects signal.
In one embodiment, as shown in Figure 4, described synchronization control module includes rest-set flip-flop (I1) and and the door (I2) that a high level triggers, described system demagnetization end signal ZXC is input to the R end of described rest-set flip-flop I1 after becoming signal ZXC_dly after delay circuit (delay), described current controling signal (K*CS_Peak) is input to the S end of described rest-set flip-flop (I1), and the Q end output open circuit of described rest-set flip-flop (I1) enables signal (OVP_EN).Described initial open circuit protection signal (OVP) and described open circuit enable signal (OVP_EN) and input described two inputs with door (I2) respectively, and the described outfan output open circuit with door (I2) protects signal (OVP_pst).
The present invention provides a kind of LED drive system, and described LED drive system includes the open-circuit-protection control circuit improving LED dimming behavior as above.In one embodiment, described LED drive system also includes LED constant current and controls module, and described LED constant current controls module for when receiving the open-circuit-protection signal of described open-circuit-protection control circuit output, and the power supply of described LED drive system is restarted.In one embodiment, described LED drive system is additionally operable to receive pulse width modulating signal, when receiving pulse width modulating signal and being high level, and LED drive system normal operation；When receiving pulse width modulating signal and being low level, LED drive system quits work.Described pulse width modulating signal is generated by wireless control system.
In one embodiment; as it is shown in figure 5, described LED drive system includes connecting the rectifier bridge filtration module of alternating voltage, energy-storage module, LED load, power control switching module, inductance peak value comparison method module, zero electro-detection module and LED constant current controls module, LED open-circuit-protection module, inductive current control module, synchronization control module.Wherein, the purpose of inductive current control module is: export a current controling signal K*CS_Peak, wherein scope 0 < k≤1 of K according to the size of inductive current.The purpose of synchronization control module is: open-circuit-protection signal OVP LED open-circuit-protection module exported and inductive current control the current controling signal K*CS_Peak of module output and carry out Synchronization Control, it is possible to the LED open-circuit-protection OVP being prevented effectively from LED drive system is caused LED flashing light by false triggering.The OVP can be avoided: controls the current controling signal K*CS_Peak of module output by detecting inductive current by the principle of false triggering to be, after only having reached the inductive current of setting, the open-circuit-protection signal OVP of triggering is considered as just correct OVP guard mode.The input signal of synchronization control module includes: zero power detection signal ZXC of zero electro-detection module output; LED open-circuit-protection module exports initial signal OVP; this signal contains mistake and correct open-circuit-protection state, and inductive current controls the inductive current control signal K*CS_Peak of module output.Output signal is the open-circuit-protection signal OVP_pst that Synchronization Control is later.
Signal waveform in above-mentioned LED drive system is as shown in Figure 6; wherein; owing to the rest-set flip-flop in synchronization control module is resetted by the demagnetization signal ZXC in the previous cycle; it is low level that the open-circuit-protection of output enables signal OVP_EN; owing to grid drive signal Ngate to be closed in advance by pulse width modulating signal PWM; it is not reaching to the inductor current value set, causes that K*CS_Peak is low level.So open-circuit-protection enables signal OVP_EN and is always low level, thus shielding the open-circuit-protection signal OVP of mistake, therefore synchronization control module shields A point and the wrong open-circuit-protection signal of B point output.At C point, owing to inductive current controls the inductor current value that module has reached to set, K*CS_Peak is high level, and therefore open-circuit-protection enables signal OVP_EN and is set to high level, it is achieved that normal open circuit protecting function, OVP_pst is high level.
The present invention provides a kind of open-circuit-protection control method improving LED dimming behavior, and in one embodiment, as described in Figure 7, the open-circuit-protection control method of the described LED of improvement dimming behavior includes:
Step S1, the inductor current value of detection system, when described inductor current value is more than setting value, control open circuit enable signal effective.
Step S2, when system demagnetization end signal being detected, after the setting time, is controlling described open circuit and is enabling invalidating signal.
Step S3, when system demagnetize the time less than the basis reference time time, produces one effective initial open circuit and protects signal.
Step S4, when enabling effective while of signal and described initial open circuit protection signal when described open circuit, produces an open-circuit-protection signal.
Wherein, step S1, S2, S3 are independent of one another, according to concrete circuit realiration.Step S1, S2, S3 execution result determine the output result of step S4.In one embodiment, the open-circuit-protection control method of the described LED of improvement dimming behavior also includes: described open-circuit-protection signal controls the power supply of LED and restarts.
In sum; the control circuit of a kind of LED of improvement dimming behavior of the present invention, control method and LED drive system can effectively reduce or avoid the LED open-circuit-protection signal in LED drive system by false triggering, thus avoiding because LED open-circuit-protection signal error triggers the LED flashing light caused.So, the present invention effectively overcomes various shortcoming of the prior art and has high industrial utilization.
Above-described embodiment is illustrative principles of the invention and effect thereof only, not for the restriction present invention.Above-described embodiment all under the spirit and category of the present invention, can be modified or change by any those skilled in the art.Therefore, art has usually intellectual such as modifying without departing from all equivalences completed under disclosed spirit and technological thought or change, must be contained by the claim of the present invention.
Claims (10)
1. the open-circuit-protection control circuit improving LED dimming behavior, it is characterised in that the open-circuit-protection control circuit of the described LED of improvement dimming behavior includes:
LED open-circuit-protection module, described LED open-circuit-protection module compares for system is demagnetized time signal and basis reference time signal, when described system demagnetize the time less than the described basis reference time time, export one effective initial open circuit and protects signal；
Inductive current controls module, for detecting the inductor current value of system, when described inductor current value is more than when setting threshold value, exports a current controling signal；
Synchronization control module, for when receiving system demagnetization end signal, after the setting time, controlling open circuit and enabling invalidating signal；When receiving described current controling signal, control described open circuit enable signal effective；Time when described initial open circuit protection signal and described open circuit enable signal while effectively, export an open-circuit-protection signal.
2. the open-circuit-protection control circuit improving LED dimming behavior according to claim 1; it is characterized in that: described synchronization control module includes the rest-set flip-flop that a high level triggers; described system demagnetization end signal is input to the R end of described rest-set flip-flop after delay circuit; described current controling signal is input to the S end of described rest-set flip-flop, and the Q end output open circuit of described rest-set flip-flop enables signal.
3. the open-circuit-protection control circuit improving LED dimming behavior according to claim 1; it is characterized in that: described synchronization control module includes one and door; described initial open circuit protection signal and described open circuit enable signal and input described two inputs with door respectively, and the described outfan output open circuit with door protects signal.
4. the open-circuit-protection control circuit improving LED dimming behavior according to claim 1, it is characterised in that: the described threshold value that sets as K times of peak current value, 0 < K≤1.
5. a LED drive system, it is characterised in that: described LED drive system includes the open-circuit-protection control circuit improving LED dimming behavior in Claims 1-4 as described in any claim.
6. LED drive system according to claim 5; it is characterized in that: described LED drive system also includes LED constant current and controls module; described LED constant current controls module for when receiving the open-circuit-protection signal of described open-circuit-protection control circuit output, and the power supply of described LED drive system is restarted.
7. LED drive system according to claim 5, it is characterised in that: described LED drive system is additionally operable to receive pulse width modulating signal, when the pulse width modulating signal received is high level, described LED drive system normal operation；When the pulse width modulating signal received is low level, described LED drive system quits work.
8. LED drive system according to claim 7, it is characterised in that: described pulse width modulating signal is generated by wireless control system.
9. the open-circuit-protection control method improving LED dimming behavior, it is characterised in that: the open-circuit-protection control method of the described LED of improvement dimming behavior includes:
The inductor current value of detection system, when described inductor current value is more than setting value, controls open circuit enable signal effective；
When system demagnetization end signal being detected, after the setting time, controlling described open circuit and enabling invalidating signal；
When system demagnetize the time less than the basis reference time time, produces one effective initial open circuit and protects signal；
When enabling effective while of signal and described initial open circuit protection signal when described open circuit, produce an open-circuit-protection signal.
10. the open-circuit-protection control method improving LED dimming behavior according to claim 9, it is characterised in that: the open-circuit-protection control method of the described LED of improvement dimming behavior also includes: described open-circuit-protection signal controls the power supply of LED and restarts.
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