CN112738951A - LED control method and circuit - Google Patents
LED control method and circuit Download PDFInfo
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- CN112738951A CN112738951A CN202110004906.0A CN202110004906A CN112738951A CN 112738951 A CN112738951 A CN 112738951A CN 202110004906 A CN202110004906 A CN 202110004906A CN 112738951 A CN112738951 A CN 112738951A
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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
- H05B45/32—Pulse-control circuits
- H05B45/325—Pulse-width modulation [PWM]
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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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention discloses a control method and a circuit of an LED, wherein the method comprises the following steps: generating a time control signal according to a comparison result of the variable voltage and the ramp voltage; enabling the time control signal to be input into the driving tube according to the LED current flowing through the LED lamp; enabling the driving tube to be switched on or switched off based on the time control signal so as to control the on-time of the LED lamp; the variable voltage is generated according to an external PWM signal, the ramp voltage is generated according to a voltage or current signal in the management chip, the ramp voltage is related to the conduction time, the average current of the LED lamp is determined according to the conduction time, the conduction time of the LED lamp is controlled, the conduction average current of the LED lamp is reduced, the LED lamp is not influenced by the peak current of the LED in the dimming process, the condition that the LED current is smaller than the minimum holding current of the silicon controlled rectifier can be avoided, and the reliability of the LED lamp is improved.
Description
Technical Field
The present disclosure relates to the field of LED control, and more particularly, to a method and a circuit for controlling an LED.
Background
In the intelligent dimming control of the silicon controlled dimming LED lamp compatible with intelligent dimming in the market, the brightness of the LED lamp is controlled by adjusting the current of the LED lamp, namely, the brightness of the LED lamp is controlled by adjusting the average current of the LED lamp under the condition of keeping the current of the silicon controlled dimming LED lamp.
Adopt above-mentioned control mode under the very little condition of dimmer corner cut, reduce the luminance of lamp to very little or extinguish through intelligent dimming, the LED lamp can keep great holding current, causes drive chip to generate heat and can damage control chip even, or makes the LED lamp can't thoroughly extinguish.
Disclosure of Invention
The invention provides a control method of an LED (light emitting diode), which is used for solving the technical problem of low reliability of an LED lamp caused by the fact that a management chip is easy to heat when the brightness of the LED lamp is controlled in the prior art.
The method is applied to an LED control circuit comprising a management chip and a driving tube, and comprises the following steps:
generating a time control signal according to a comparison result of the variable voltage and the ramp voltage;
enabling the time control signal to be input into the driving tube according to the LED current flowing through the LED lamp;
enabling the driving tube to be switched on or switched off based on the time control signal so as to control the on-time of the LED lamp;
the variable voltage is generated according to an external PWM signal, the ramp voltage is generated according to a voltage or current signal in the management chip, the ramp voltage is related to the conduction time, and the average current of the LED lamp is determined according to the conduction time.
In some embodiments of the present application, the time control signal is input to the driving tube according to an LED current flowing through an LED lamp, specifically:
comparing a comparison voltage generated according to the variable current with a preset reference voltage, outputting a control voltage, and reducing the LED current based on the control voltage;
and when the LED current is reduced to the minimum maintaining current value of the controllable silicon of the LED lamp, the LED current is maintained unchanged, and the time control signal is input into the driving tube.
In some embodiments of the present application, the time control signal is input to the driving tube according to an LED current flowing through an LED lamp, specifically:
comparing a comparison voltage generated according to the variable current with a preset reference voltage, outputting a control voltage, reducing the LED current based on the control voltage, and inputting the time control signal into the driving tube;
wherein the LED current is maintained when the LED current is reduced to the minimum maintaining current value of the controllable silicon of the LED lamp.
In some embodiments of the present application, the time control signal is input to the driving tube according to an LED current flowing through an LED lamp, specifically:
and maintaining the LED current at a preset current value and enabling the time control signal to be input into the driving tube.
In some embodiments of the present application, the LED lamp is turned on when the driving tube is turned on, and the LED lamp is turned off when the driving tube is turned off.
Correspondingly, the invention also provides a control circuit of the LED, which comprises a management chip and a driving tube, and the circuit also comprises:
the conduction duration control unit is used for converting an external PWM signal into variable voltage, comparing the variable voltage with a ramp voltage and then generating a time control signal, and conducting or stopping the driving tube based on the time control signal so as to control the conduction duration of the LED lamp;
the ramp voltage is generated according to a voltage or current signal in the management chip, the ramp voltage is related to the conduction time length, and the average current of the LED lamp is determined according to the conduction time length.
In some embodiments of the present application, the on-time period control unit includes a first PWM control circuit and a first resistor, wherein,
the first PWM control circuit is used for generating the external PWM signal;
the output end of the first PWM control circuit is connected with the grid electrode of the driving tube, the drain electrode of the driving tube is connected with the cathode of the LED, and the source electrode of the driving tube is grounded through the first resistor.
In some embodiments of the present application, the first PWM control circuit includes a PWM converter, a first comparator and a first power transistor, wherein,
the output end of the PWM converter is connected with the negative input end of the first comparator, the output end of the first comparator is connected with the grid electrode of the first power tube, the positive input end of the first comparator is connected with the ramp voltage, the drain electrode of the first power tube is connected with the grid electrode of the driving tube, and the source electrode of the first power tube is grounded.
In some embodiments of the present application, the circuit further comprises:
a current control unit including a second PWM control circuit, a second comparator, and a second resistor, for comparing a comparison voltage generated according to a variable current with a preset reference voltage, outputting a control voltage, and controlling the LED current based on the control voltage, wherein,
the second PWM control circuit is used for generating the comparison voltage;
the output end of the second PWM control circuit and the first end of the second resistor are connected to the negative input end of the second comparator in a shared mode, the output end of the second comparator is connected with the grid electrode of the driving tube, the positive input end of the second comparator is connected with a preset reference signal, and the second end of the second resistor is connected with the source electrode of the driving tube.
In some embodiments of the present application, the time control signal is input to the driving tube when the LED current starts to decrease, or the time control signal is input to the driving tube when the LED current decreases to a minimum maintaining current value of a thyristor of the LED lamp, or the time control signal is input to the driving tube when the LED current is maintained at a preset current value.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a control method and a circuit of an LED, wherein the method comprises the following steps: generating a time control signal according to a comparison result of the variable voltage and the ramp voltage; enabling the time control signal to be input into the driving tube according to the LED current flowing through the LED lamp; enabling the driving tube to be switched on or switched off based on the time control signal so as to control the on-time of the LED lamp; the variable voltage is generated according to an external PWM signal, the ramp voltage is generated according to a voltage or current signal in the management chip, the ramp voltage is related to the conduction time, the average current of the LED lamp is determined according to the conduction time, the conduction time of the LED lamp is controlled, the conduction average current of the LED lamp is reduced, the LED lamp is not influenced by the peak current of the LED in the dimming process, the condition that the LED current is smaller than the minimum holding current of the silicon controlled rectifier can be avoided, and the reliability of the LED lamp is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 shows a schematic structural diagram of an LED control circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram showing the structure of a first PWM control circuit according to an embodiment of the present invention;
fig. 3 is a schematic flow chart illustrating a method for controlling an LED according to an embodiment of the present invention;
fig. 4 shows a schematic diagram of the comparison principle of the variable voltage and the ramp voltage in the embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the invention provides a control method of an LED, which is applied to an LED control circuit comprising a management chip and a driving tube, and as shown in fig. 3, the control method comprises the following steps:
in step S301, a time control signal is generated according to a comparison result of the variable voltage and the ramp voltage.
In this embodiment, the LED control circuit includes a management chip and a driving tube, the variable voltage is generated according to an external PWM signal, the ramp voltage is generated according to a voltage or current signal in the management chip, and the time control signal is generated according to a comparison result by comparing the variable voltage with the ramp voltage.
In order to generate an accurate time control signal, in some embodiments of the present application, the variable voltage is generated according to different duty ratios of an external PWM signal, and the ramp voltage corresponding to each duty ratio is different. In a specific application scenario of the present application, the duty ratio may be 0 to 100%, as shown in fig. 4, the duty ratio includes 20%, 40%, 60%, and 80%, and each of the duty ratios corresponds to a different ramp voltage.
Step S302, inputting the time control signal into the driving tube according to the LED current flowing through the LED lamp.
In this embodiment, the LED current flowing through the LED lamp is obtained, and the time control signal is input to the driving tube according to the LED current control.
In order to improve the reliability of the management chip, in some embodiments of the present application, the time control signal is input to the driving tube according to an LED current flowing through an LED lamp, specifically:
comparing a comparison voltage generated according to the variable current with a preset reference voltage, outputting a control voltage, and reducing the LED current based on the control voltage;
and when the LED current is reduced to the minimum maintaining current value of the controllable silicon of the LED lamp, the LED current is maintained unchanged, and the time control signal is input into the driving tube.
In this embodiment, the LED current is first reduced and then the on-time of the LED lamp is controlled, so as to control the average current of the LED lamp, specifically, the comparison voltage generated according to the variable current is first compared with the preset reference voltage, the control voltage is output, and then the LED current is reduced based on the control voltage.
In order to improve the reliability of the management chip, in some embodiments of the present application, the time control signal is input to the driving tube according to an LED current flowing through an LED lamp, specifically:
outputting a control voltage based on comparing a comparison voltage generated according to a variable current with a preset reference voltage, reducing the LED current based on the control voltage, and inputting the time control signal to the driving tube;
wherein the LED current is maintained when the LED current is reduced to the minimum maintaining current value of the controllable silicon of the LED lamp.
In this embodiment, the LED current is reduced and the on-time of the LED lamp is controlled at the same time, so as to control the average current of the LED lamp, specifically, the comparison voltage generated according to the variable current is compared with the preset reference voltage, the control voltage is output, the LED current is reduced based on the control voltage, and the time control signal is input to the driving tube, so as to avoid the heating of the management chip, and maintain the LED current unchanged when the LED current is reduced to the minimum maintenance current value of the thyristor of the LED lamp.
In order to improve the reliability of the management chip, in some embodiments of the present application, the time control signal is input to the driving tube according to an LED current flowing through an LED lamp, specifically:
and maintaining the LED current at a preset current value and enabling the time control signal to be input into the driving tube.
In this embodiment, the average current of the LED lamp is controlled only based on the on-time of the LED lamp, so that the LED current is maintained at the preset current value, and the time control signal is input to the driving tube.
And step S303, switching on or off the driving tube based on the time control signal so as to control the on-time of the LED lamp.
In this embodiment, the driving tube can be turned on or off by the time control signal, so that the on-time of the LED lamp can be controlled, the average current of the LED lamp is determined according to the on-time, and the LED lamp is adjusted.
In order to reliably control the LED lamp, in a preferred embodiment of the present application, the LED lamp is turned on when the driving tube is turned on, and the LED lamp is turned off when the driving tube is turned off.
In the embodiment, the driving tube is connected to the cathode of the LED lamp, and the LED lamp is conducted when the driving tube is conducted; and when the driving tube is cut off, the LED lamp is turned off.
By applying the technical scheme, in the LED control circuit comprising the management chip and the driving tube, a time control signal is generated according to the comparison result of the variable voltage and the ramp voltage; enabling the time control signal to be input into the driving tube according to the LED current flowing through the LED lamp; enabling the driving tube to be switched on or switched off based on the time control signal so as to control the on-time of the LED lamp; the variable voltage is generated according to an external PWM signal, the ramp voltage is generated according to a voltage or current signal in the management chip, the ramp voltage is related to the conduction time, the average current of the LED lamp is determined according to the conduction time, the conduction time of the LED lamp is controlled, the conduction average current of the LED lamp is reduced, the LED lamp is not influenced by the peak current of the LED in the dimming process, the condition that the LED current is smaller than the minimum holding current of the silicon controlled rectifier can be avoided, and the reliability of the LED lamp is improved.
In order to further illustrate the technical idea of the present invention, the technical solution of the present invention will now be described with reference to specific application scenarios.
The present embodiment provides a control circuit of an LED, as shown in fig. 1, including the following three control modes.
The control method is as follows: the PWM control circuit 2 and the PWM control circuit 1 act in sequence, specifically, the PWM control circuit 2 controls the LED current to be different in magnitude by controlling the current i (the magnitude of the current i is different according to different PWM duty ratios) and finally controlling the voltage at 2 points to be different, and the control is the first step of controlling the LED current amplitude; at this time, it should be noted that the current of the LED cannot be smaller than the minimum maintaining current value of the thyristor of the LED lamp, when the LED falls to the minimum maintaining current value, the PWM control circuit 1 starts to work, and the PWM control circuit 1 controls whether the 3 points are low or not according to different PWM duty ratios; when the LED works normally, the 3-point is not acted, and when the LED current is cut off, the 3-point potential is pulled low, so that the NMOS1 is turned off and can not work normally.
And in the second control mode, the PWM control circuit 1 and the PWM control circuit 2 act simultaneously without sequencing, and the LED cannot be smaller than the minimum maintaining current value of the controllable silicon of the LED lamp on the current of the LED.
And the control mode is three, only the PWM control circuit 2 is applied, when the PWM duty ratio is changed, the action time of the 3-point voltage in each LED conduction period is different, and the problem of the minimum maintenance current value of the controllable silicon does not need to be considered, because the LED current is not changed in the whole conduction process, but the conduction time of each period is determined by the PWM duty ratio.
The embodiment of the present application further provides a control circuit of an LED, as shown in fig. 2, including a management chip and a driving transistor NMOS1, where the circuit further includes:
the on-time control unit is used for converting an external PWM signal into variable voltage, comparing the variable voltage with a ramp voltage and then generating a time control signal, and enabling the NMOS1 of the driving tube to be on or off based on the time control signal so as to control the on-time of the LED lamp;
the ramp voltage is generated according to a voltage or current signal in the management chip, the ramp voltage is related to the conduction time length, and the average current of the LED lamp is determined according to the conduction time length.
For reliable generation of the time control signal, in some embodiments of the present application, the on-time period control unit includes a first PWM control circuit (i.e., PWM control circuit 1) and a first resistor r1, wherein,
the first PWM control circuit is used for generating the external PWM signal;
the output end of the first PWM control circuit is connected with the grid electrode of the driving tube NMOS1, the drain electrode of the driving tube NMOS1 is connected with the cathode of the LED, and the source electrode of the driving tube NMOS1 is grounded through the first resistor r 1.
For reliable generation of the time control signal, in some embodiments of the present application, as shown in fig. 3, the first PWM control circuit includes a PWM converter, a first comparator a1 and a first power transistor M1, wherein,
the output end of the PWM converter is connected to the negative input end of the first comparator a1, the output end of the first comparator a1 is connected to the gate of the first power transistor M1, the positive input end of the first comparator a1 is connected to the ramp voltage, the drain of the first power transistor M1 is connected to the gate of the driving transistor NMOS1, and the source of the first power transistor M1 is grounded.
For reliable control of the LED current, in some embodiments of the present application, as shown in fig. 1, the circuit further comprises:
a current control unit including a second PWM control circuit (i.e., PWM control circuit 2), a second comparator a2, and a second resistor r2, for comparing a comparison voltage generated according to a variable current with a preset reference voltage, outputting a control voltage, and controlling the LED current based on the control voltage, wherein,
the second PWM control circuit is used for generating the comparison voltage;
the output end of the second PWM control circuit and the first end of the second resistor r2 are commonly connected to the negative input end of the second comparator a2, the output end of the second comparator a2 is connected to the gate of the driving transistor NMOS1, the positive input end of the second comparator a2 is connected to a preset reference signal Vref, and the second end of the second resistor r2 is connected to the source of the driving transistor NMOS 1.
In order to accurately control the on-time of the LED lamp, in some embodiments of the present application, the time control signal is input to the driving tube NMOS1 when the LED current starts to decrease, or the time control signal is input to the driving tube NMOS1 when the LED current decreases to the minimum holding current value of the thyristor of the LED lamp, or the time control signal is input to the driving tube NMOS1 when the LED current is maintained at the preset current value.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A control method of an LED is applied to an LED control circuit comprising a management chip and a driving tube, and comprises the following steps:
generating a time control signal according to a comparison result of the variable voltage and the ramp voltage;
enabling the time control signal to be input into the driving tube according to the LED current flowing through the LED lamp;
enabling the driving tube to be switched on or switched off based on the time control signal so as to control the on-time of the LED lamp;
the variable voltage is generated according to an external PWM signal, the ramp voltage is generated according to a voltage or current signal in the management chip, the ramp voltage is related to the conduction time, and the average current of the LED lamp is determined according to the conduction time.
2. The method according to claim 1, wherein the time control signal is input to the driving tube according to the LED current flowing through the LED lamp, specifically:
comparing a comparison voltage generated according to the variable current with a preset reference voltage, outputting a control voltage, and reducing the LED current based on the control voltage;
and when the LED current is reduced to the minimum maintaining current value of the controllable silicon of the LED lamp, the LED current is maintained unchanged, and the time control signal is input into the driving tube.
3. The method according to claim 1, wherein the time control signal is input to the driving tube according to the LED current flowing through the LED lamp, specifically:
comparing a comparison voltage generated according to the variable current with a preset reference voltage, outputting a control voltage, reducing the LED current based on the control voltage, and inputting the time control signal into the driving tube;
wherein the LED current is maintained when the LED current is reduced to the minimum maintaining current value of the controllable silicon of the LED lamp.
4. The method according to claim 1, wherein the time control signal is input to the driving tube according to the LED current flowing through the LED lamp, specifically:
and maintaining the LED current at a preset current value and enabling the time control signal to be input into the driving tube.
5. The method of claim 1, wherein the LED light is turned on when the driving tube is turned on, and the LED light is turned off when the driving tube is turned off.
6. A control circuit of LED, including management chip and drive tube, its characterized in that, the circuit still includes:
the conduction duration control unit is used for converting an external PWM signal into variable voltage, comparing the variable voltage with a ramp voltage and then generating a time control signal, and conducting or stopping the driving tube based on the time control signal so as to control the conduction duration of the LED lamp;
the ramp voltage is generated according to a voltage or current signal in the management chip, the ramp voltage is related to the conduction time length, and the average current of the LED lamp is determined according to the conduction time length.
7. The circuit of claim 6, wherein the on-time period control unit includes a first PWM control circuit and a first resistor, wherein,
the first PWM control circuit is used for generating the external PWM signal;
the output end of the first PWM control circuit is connected with the grid electrode of the driving tube, the drain electrode of the driving tube is connected with the cathode of the LED, and the source electrode of the driving tube is grounded through the first resistor.
8. The circuit of claim 7, wherein the first PWM control circuit includes a PWM converter, a first comparator, and a first power transistor, wherein,
the output end of the PWM converter is connected with the negative input end of the first comparator, the output end of the first comparator is connected with the grid electrode of the first power tube, the positive input end of the first comparator is connected with the ramp voltage, the drain electrode of the first power tube is connected with the grid electrode of the driving tube, and the source electrode of the first power tube is grounded.
9. The circuit of claim 6, wherein the circuit further comprises:
a current control unit including a second PWM control circuit, a second comparator, and a second resistor, for comparing a comparison voltage generated according to a variable current with a preset reference voltage, outputting a control voltage, and controlling the LED current based on the control voltage, wherein,
the second PWM control circuit is used for generating the comparison voltage;
the output end of the second PWM control circuit and the first end of the second resistor are connected to the negative input end of the second comparator in a shared mode, the output end of the second comparator is connected with the grid electrode of the driving tube, the positive input end of the second comparator is connected with a preset reference signal, and the second end of the second resistor is connected with the source electrode of the driving tube.
10. The circuit as claimed in claim 6, wherein the time control signal is inputted to the driving tube when the LED current starts to decrease, or the time control signal is inputted to the driving tube when the LED current decreases to a minimum maintaining current value of a thyristor of the LED lamp, or the time control signal is inputted to the driving tube when the LED current maintains at a preset current value.
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| CN110446308A (en) * | 2019-09-04 | 2019-11-12 | 杭州必易微电子有限公司 | For controlling control circuit, driving circuit, LED lamp system and the control method of power transistor |
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