CN114845437A - Multi-power-level constant-current LED driving circuit - Google Patents
Multi-power-level constant-current LED driving circuit Download PDFInfo
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- CN114845437A CN114845437A CN202210318901.XA CN202210318901A CN114845437A CN 114845437 A CN114845437 A CN 114845437A CN 202210318901 A CN202210318901 A CN 202210318901A CN 114845437 A CN114845437 A CN 114845437A
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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
- H05B45/345—Current stabilisation; Maintaining constant current
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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]
-
- 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
- H05B45/34—Voltage stabilisation; Maintaining constant voltage
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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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a multi-power-level constant-current LED driving circuit, which comprises a digital current source, a constant-current tube M1, a mirror image tube M2, a comparator, a logic circuit, a controlled voltage source and an LED lamp, wherein the digital current source is connected with the constant-current tube M1; the digital current source is controlled by the current control logic and can output a plurality of current levels, the comparator outputs high and low levels according to the difference value between the drain electrode of the constant current tube M1 and the reference voltage, and the logic circuit controls the controlled voltage source to reduce or increase the output voltage according to the level output by the comparator; the power supply has the advantages of no stroboflash, low power loss, over-power protection and stable power output.
Description
Technical Field
The invention relates to the technical field of LED driving, in particular to a multi-power-level constant-current LED driving circuit.
Background
At present, stroboflash of an LED lamp has serious influence on the service life of an LED lamp bead and the health of human eyes, the average power of the lamp is reduced by controlling the on-time of an LED by using Pulse Width Modulation (PWM), and the reduction of the power of the lamp can be realized; however, this method has the following disadvantages that the LED is turned off for a certain period of time during the power reduction process: 1. when the power of the LED is reduced, the LED is turned off for a period of time, and the LED lamp has the problem of stroboflash; 2. when the power supply voltage is unstable or the power supply voltage is increased, the working current of the LED becomes large, and the power is unstable; 3. when the power supply voltage is unstable or the power supply voltage is increased, the power consumed by the current-limiting resistor is increased, and the over-power burning is possible; 4. because the excess power of the scheme is consumed on the current-limiting resistor, the efficiency of the system becomes low, and therefore, a novel LED driving circuit is urgently needed to solve the above problems.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a multi-power-level constant-current LED driving circuit.
The technical scheme adopted by the embodiment of the invention for solving the technical problem is as follows: a constant-current LED drive circuit with multiple power levels comprises a digital current source, a constant-current tube M1, a mirror tube M2, a comparator, a logic circuit, a controlled voltage source and an LED lamp, wherein the digital current source is electrically connected with the drain electrode of the mirror tube M2, the grid electrode of the mirror tube M2 is electrically connected with the grid electrode of the constant-current tube M1, the drain electrode of the constant-current tube M1 is respectively electrically connected with one input end of the comparator and the negative electrode of the LED lamp, the other input end of the comparator is connected with a reference voltage, the output end of the comparator is electrically connected with the positive electrode of the LED lamp after passing through the logic circuit and the controlled voltage source, and the grounding end of the digital current source, the source electrode of the mirror tube M2, the source electrode of the constant-current tube M1, the grounding end of the comparator and the grounding end of the logic circuit are grounded; the digital current source is controlled by the current control logic and can output a plurality of current steps, the comparator outputs high level or low level according to the difference value between the drain electrode of the constant current tube M1 and the reference voltage, and the logic circuit controls the controlled voltage source to reduce or increase the output voltage according to the level output by the comparator.
The invention has the beneficial effects that:
1) the LED lamp is driven by adopting a constant current mode, the power of the LED lamp is changed by changing the magnitude of the driving current, and the power of the LED lamp is not changed by adopting a method of controlling the lamp to be turned on and off by PWM (pulse width modulation), because the driving current of the LED lamp is always present, the LED is always kept on and is not in an off state, stroboflash can not be generated;
2) because the invention has no current-limiting resistor, the power loss of the current-limiting resistor is reduced, the efficiency can be improved, and the risk that the current-limiting resistor is burnt by over-power is reduced;
3) the invention can control the drain voltage of the constant current tube M1, thereby protecting the constant current tube from being burnt by over power.
4) Because the controlled voltage source is controlled, even if the output voltage changes, the output of the controlled voltage source is controlled at a stable output voltage by the logic circuit, so that the power of the invention is kept stable.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a prior art PWM controlled LED drive scheme;
fig. 2 is a circuit diagram of a multi-power-level constant-current LED driving circuit.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, a plurality of means is two or more, and greater than, less than, more than, etc. are understood as excluding the present number, and greater than, less than, etc. are understood as including the present number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless explicitly defined otherwise, the terms "disposed," "mounted," "connected," and the like are to be understood in a broad sense, and for example, may be directly connected or indirectly connected through an intermediate; can be fixedly connected, can also be detachably connected and can also be integrally formed; may be a mechanical connection; either as communication within the two elements or as an interactive relationship of the two elements. The specific meaning of the above-mentioned words in the present invention can be reasonably determined by those skilled in the art in combination with the detailed contents of the technical solutions.
Referring to fig. 1-2, a multi-power-level constant current LED driving circuit includes a digital current source, a constant current tube M1, a mirror image tube M2, a comparator, a logic circuit, a controlled voltage source and an LED lamp, where the digital current source is electrically connected to a drain of the mirror image tube M2, a gate of the mirror image tube M2 is electrically connected to a gate of the constant current tube M1, a drain of the constant current tube M1 is electrically connected to an input end of the comparator and a cathode of the LED lamp, another input end of the comparator is connected to a reference voltage, an output end of the comparator is electrically connected to a positive electrode of the LED lamp after passing through the logic circuit and the controlled voltage source, a ground terminal of the digital current source, a source of the mirror image tube M2, a source of the constant current tube M1, a ground terminal of the comparator and a ground terminal of the logic circuit are grounded; the digital current source is controlled by the current control logic and can output a plurality of current steps, the comparator outputs high level or low level according to the difference value of the drain electrode of the constant current tube M1 and the reference voltage, and the logic circuit controls the controlled voltage source to reduce or increase the output voltage according to the level output by the comparator.
The invention is composed of a digital current source, a constant current tube M1, a mirror image tube M2, a comparator, a logic circuit, a controlled voltage source, a linear voltage regulator (LDO), an LED lamp and other modules; the mirror tube M2 mirrors the current generated by the digital current source to the constant current tube M1 in proportion, then drives the LED lamp to work, the drain voltage of the constant current tube M1 is determined by the input reference voltage of the comparator, when the drain voltage of the M1 is higher than the reference voltage, the output of the comparator is inverted, after the logic circuit identifies the inversion signal, the logic circuit controls the controlled voltage source through the control signal to reduce the output voltage until the voltage of the drain of the M1 is lower than the reference voltage, the comparator is inverted again, and the logic circuit controls the controlled voltage source to increase the output voltage.
The functions of the components in the invention are as follows:
1) digital current source: the effect of the current mirror is to provide the required bias current for the mirror tube M2; the digital current source is controlled by 5-bit digital logic, and can generate 1-32 levels of current output, the output current range is 200uA-6.4mA, and the current change of each level is 200 uA;
2) mirror tube M2 and constant flow tube M1: the LED lamp is used for providing driving current for the LED lamp; the size ratio of the mirror image tube M2 to the constant flow tube M1 is preferably 1: 40, the current flowing into the mirror tube M2 can be amplified by 40 times in the same proportion, namely the output current range of the constant current tube M1 is 8mA-256 mA;
3) a comparator: the constant current tube voltage comparator has the effects that the drain voltage of the constant current tube M1 is compared with the reference voltage, and the comparison result is output, when the drain voltage of the M1 is higher than the reference voltage, the comparator outputs high level, and when the drain voltage of the M1 is lower than the reference voltage, the comparator outputs low level;
4) a logic circuit: the function of the voltage regulator is to judge the output voltage of the comparator and generate a PWM control signal to regulate the output voltage of the controllable voltage source, when the comparator outputs a high level, the voltage source is controlled to reduce the output voltage, and when the comparator outputs a low level, the voltage source is controlled to increase the output voltage;
5) controlled voltage source: the function of the circuit is to regulate the output voltage according to the PWM signal output by the logic circuit;
6) linear regulator (LDO): the function of the device is to generate 5V direct current output to supply power for various low-voltage modules;
7) LED lamps and lanterns: the LED lamp is driven by the current output of the constant current tube M1 to emit light.
The invention has the advantages that:
1) the LED lamp is driven by adopting a constant current mode, the power of the LED lamp is changed by changing the magnitude of the driving current, and the power of the LED lamp is not changed by adopting a method of controlling the lamp to be turned on and off by PWM (pulse width modulation), because the driving current of the LED lamp is always present, the LED is always kept on and is not in an off state, stroboflash can not be generated;
2) because the current-limiting resistor is not arranged, the power loss of the current-limiting resistor is reduced, the efficiency can be improved, and the risk that the current-limiting resistor is burnt by overpower is reduced;
3) the invention can control the drain voltage of the constant current tube M1, thereby protecting the constant current tube from being burnt by over power.
4) Because the controlled voltage source is controlled, even if the output voltage changes, the output of the controlled voltage source is controlled at a stable output voltage by the logic circuit, so that the power of the invention is kept stable.
It is to be understood that the present invention is not limited to the above-described embodiments, and that equivalent modifications and substitutions may be made by those skilled in the art without departing from the spirit of the present invention, and that such equivalent modifications and substitutions are to be included within the scope of the appended claims.
Claims (1)
1. A constant current LED drive circuit of many power levels which characterized in that: the LED lamp comprises a digital current source, a constant current tube M1, a mirror image tube M2, a comparator, a logic circuit, a controlled voltage source and an LED lamp, wherein the digital current source is electrically connected with the drain electrode of the mirror image tube M2, the grid electrode of the mirror image tube M2 is electrically connected with the grid electrode of the constant current tube M1, the drain electrode of the constant current tube M1 is respectively electrically connected with one input end of the comparator and the negative electrode of the LED lamp, the other input end of the comparator is connected with a reference voltage, the output end of the comparator is electrically connected with the positive electrode of the LED lamp after passing through the logic circuit and the controlled voltage source, and the grounding end of the digital current source, the source electrode of the mirror image tube M2, the source electrode of the constant current tube M1, the grounding end of the comparator and the grounding end of the logic circuit are grounded; the digital current source is controlled by current control logic and can output a plurality of current steps, the comparator outputs high level or low level according to the difference value of the drain electrode of the constant current tube M1 and the reference voltage, and the logic circuit controls the controlled voltage source to reduce or increase the output voltage according to the level output by the comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210318901.XA CN114845437A (en) | 2022-03-29 | 2022-03-29 | Multi-power-level constant-current LED driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210318901.XA CN114845437A (en) | 2022-03-29 | 2022-03-29 | Multi-power-level constant-current LED driving circuit |
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| CN114845437A true CN114845437A (en) | 2022-08-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210318901.XA Pending CN114845437A (en) | 2022-03-29 | 2022-03-29 | Multi-power-level constant-current LED driving circuit |
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| CN (1) | CN114845437A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1941052A (en) * | 2005-09-28 | 2007-04-04 | 株式会社理光 | Driving circuit and electronic device using the same |
| US20130147393A1 (en) * | 2011-06-09 | 2013-06-13 | Cristiano Bazzani | High accuracy, high dynamic range led/laser driver |
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2022
- 2022-03-29 CN CN202210318901.XA patent/CN114845437A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1941052A (en) * | 2005-09-28 | 2007-04-04 | 株式会社理光 | Driving circuit and electronic device using the same |
| US20130147393A1 (en) * | 2011-06-09 | 2013-06-13 | Cristiano Bazzani | High accuracy, high dynamic range led/laser driver |
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Application publication date: 20220802 |
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