CN113133156A - Current shunt circuit suitable for LED degree of depth is adjusted luminance - Google Patents
Current shunt circuit suitable for LED degree of depth is adjusted luminance Download PDFInfo
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- CN113133156A CN113133156A CN202110449938.1A CN202110449938A CN113133156A CN 113133156 A CN113133156 A CN 113133156A CN 202110449938 A CN202110449938 A CN 202110449938A CN 113133156 A CN113133156 A CN 113133156A
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- 150000004706 metal oxides Chemical class 0.000 abstract 1
- 239000004065 semiconductor Substances 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 8
- 230000001419 dependent effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000002955 isolation Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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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]
- H05B45/10—Controlling the intensity of the light
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention provides a current shunt circuit suitable for deep dimming of an LED (light emitting diode), which comprises a constant current power supply, an LED lamp, a first MOS (metal oxide semiconductor) tube, a second MOS tube, a first operational amplifier and a resistor, wherein: the grid electrode of the first MOS tube is connected with the output end of the first operational amplifier; the drain electrode of the first MOS tube is connected with one end of the LED lamp, the source electrode of the first MOS tube is connected with the inverting input end of the first operational amplifier and one end of the resistor, and the other end of the resistor is grounded; the constant current power supply is connected with the other end of the LED lamp and the drain electrode of the second MOS tube; a grid electrode of the second MOS tube is connected with a voltage signal; the source electrode of the second MOS tube is grounded. The invention additionally extracts a current in a current subtraction mode to reduce the amount of current flowing through the LED in a current sum mode, thereby realizing the function of fine dimming. Compared with the traditional dimming mode, the dimming device can perform detailed low-section dimming, is lower in dimming, and can select the function of cutting off the attached or non-attached belt.
Description
Technical Field
The invention relates to the field of dimming, in particular to a current shunt circuit suitable for deep dimming of an LED.
Background
The current of the LED is directly adjusted in the existing LED dimming mode, but the dimming depth of the existing LED dimming mode is insufficient.
The patent document CN206370965U discloses a 0-10V LED dimming signal conversion circuit and an LED power dimming circuit. A drive signal for inciting somebody to action 0 ~ 10V dimming signal conversion is LED power supply dimming circuit's control chip, includes: the power supply input end is used for receiving an input power supply to serve as a working power supply of the 0-10V LED dimming signal conversion circuit; one side of the isolation element is connected with the 0-10V dimming signal input end and is used for receiving 0-10V dimming signals; the other side of the isolation element is connected with the conversion module and is connected with the power input end; the isolation element is used for performing equal ratio isolation on the voltage of the 0-10V dimming signal and then serving as the input voltage of the conversion module; and the conversion module is used for converting the input voltage into a driving signal with a target voltage and outputting the driving signal to the control chip. The 0-10V LED dimming signal conversion circuit does not involve a complex single-chip microcomputer technology or a conventional analog PWM (pulse-width modulation) adjusting conversion circuit, and is simple in structure and low in cost. But the above solution cannot achieve the problem of dimming depth.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a current shunt circuit suitable for deep dimming of an LED.
The current shunt circuit suitable for deep dimming of the LED comprises a constant current power supply, an LED lamp, a first MOS tube, a second MOS tube, a first operational amplifier and a resistor, wherein:
the grid electrode of the first MOS tube is connected with the output end of the first operational amplifier; the drain electrode of the first MOS tube is connected with one end of the LED lamp, the source electrode of the first MOS tube is connected with the inverting input end of the first operational amplifier and one end of the resistor, and the other end of the resistor is grounded;
the constant current power supply is connected with the other end of the LED lamp and the drain electrode of the second MOS tube;
a grid electrode of the second MOS tube is connected with a voltage signal; the source electrode of the second MOS tube is grounded.
Preferably, the non-inverting input terminal of the first operational amplifier is connected to a dimming signal.
Preferably, the LED lamp comprises an MR16LED lamp.
Preferably, the MOS transistor further comprises a second operational amplifier, and the output end of the second operational amplifier is connected to the gate of the second MOS transistor.
Preferably, the non-inverting input terminal of the second operational amplifier is connected to the dimming signal VR.
Preferably, the inverting input end of the second operational amplifier is connected with the source electrode of the second MOS transistor.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention additionally extracts a current in a current subtraction mode to reduce the amount of current flowing through the LED in a current sum mode, thereby realizing the function of fine dimming.
2. Compared with the traditional dimming mode, the dimming device can perform detailed low-section dimming, is lower in dimming, and can select the function of cutting off the attached or non-attached belt.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1-3 are schematic diagrams of current shunting circuits suitable for deep dimming of LEDs.
Fig. 4 is a circuit diagram of the dimming signal adjusting circuit of the dimming dependent signal Vref.
FIG. 5 is a circuit diagram of the dimming signal adjusting circuit of the dimming dependent signal Vref when it is cut off.
Fig. 6 is a circuit diagram of the dimming signal adjusting circuit of the dimming dependent signal Vref in the phase adjusting process after the current summation and the addition.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
The conventional dimming method usually uses one reference voltage signal, which is denoted as Vref ═ F (VC 2). That is, the dimming signal Vref is a multi-phase component related to VC 2. Here shown as the next constant current from VBUS and controlled by OP (operational amplifier).
The invention makes I constant in the way of the total sum of the circuit currentIN＝ILED+IBLDOutput current ILEDCan be represented as ILED＝IIN-IBLDThe circuit for additionally pumping and discharging the extracted current can be regarded as a reference current signal or a voltage signal, and then comparison is carried out, and the current signal or the voltage signal is converted into the additionally pumped current after weighting, so that the load current flowing through the LED is reduced.
Wherein the additional extraction current generated by weighting is represented by the current flowing through the sampled current signal (VR) and is represented by IBLD＝VR*F(x)/RSENSE. Where f (x) may be a constant term, say 0.1 or 0.5, or a polynomial or exponential term of the VR signal.
By the mode, the problem of insufficient original dimming depth can be solved by additionally extracting total current energy for shunting, so that the current flowing through the LED is effectively reduced substantially, and the target current depth is achieved.
Specifically, as shown in fig. 1 to 6, the current splitting circuit suitable for deep dimming of an LED according to the present invention includes a constant current source, an LED lamp, a first MOS transistor, a second MOS transistor, a first operational amplifier, and a resistor, wherein: the grid electrode of the first MOS tube is connected with the output end of the first operational amplifier; the drain electrode of the first MOS tube is connected with one end of the LED lamp, the source electrode of the first MOS tube is connected with the inverting input end of the first operational amplifier and one end of the resistor, and the other end of the resistor is grounded; the constant current power supply is connected with the other end of the LED lamp and the drain electrode of the second MOS tube; a grid electrode of the second MOS tube is connected with a voltage signal; the source electrode of the second MOS tube is grounded. The non-inverting input end of the first operational amplifier is connected with the dimming signal. The LED lamp comprises an MR16LED lamp. The output end of the second operational amplifier is connected to the grid electrode of the second MOS tube. The non-inverting input end of the second operational amplifier is connected with the dimming signal VR. The inverting input end of the second operational amplifier is connected with the source electrode of the second MOS tube.
As shown in fig. 4, as the dimming dependent signal Vref is dimmed down, the IBLD current drawn from the main line gradually increases, and the voltage of the corresponding M2 tube (referred to as V2 tube) is increasedBLD) The impedance is gradually decreased due to the channel modulation of MOS tube, so as to change VBLDAnd (5) pulling down.
In the embodiment of fig. 5, which is one of the pinch-off methods, when the LED dimming end is at a certain level, the small current does not need to remain, and when all the remaining current flowing through the LED needs to be pinched off, a sufficiently large I needs to be pulledBLDThe current is applied.
FIG. 6 shows the sum of the currents and the adjusted phase after addition, and it can be seen that the ILED current is IBLDA lower dimming current level can be achieved after the subtraction.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (6)
1. The utility model provides a current-shunting circuit suitable for LED degree of depth is adjusted luminance which characterized in that, includes constant current power supply, LED lamp, first MOS pipe, second MOS pipe, first operational amplifier and resistance, wherein:
the grid electrode of the first MOS tube is connected with the output end of the first operational amplifier; the drain electrode of the first MOS tube is connected with one end of the LED lamp, the source electrode of the first MOS tube is connected with the inverting input end of the first operational amplifier and one end of the resistor, and the other end of the resistor is grounded;
the constant current power supply is connected with the other end of the LED lamp and the drain electrode of the second MOS tube;
a grid electrode of the second MOS tube is connected with a voltage signal; the source electrode of the second MOS tube is grounded.
2. The current splitting circuit for deep dimming of LED according to claim 1, wherein the non-inverting input terminal of the first operational amplifier is connected to a dimming signal.
3. The current splitting circuit for deep dimming of LEDs of claim 1, wherein the LED lamp comprises an MR16LED lamp.
4. The current splitting circuit suitable for deep dimming of an LED according to claim 1, further comprising a second operational amplifier, wherein an output terminal of the second operational amplifier is connected to a gate of the second MOS transistor.
5. The current splitting circuit for deep dimming of LED according to claim 4, wherein the non-inverting input terminal of the second operational amplifier is connected to the dimming signal VR.
6. The current splitting circuit for deep dimming of LED according to claim 4, wherein the inverting input terminal of the second operational amplifier is connected to the source of the second MOS transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110449938.1A CN113133156B (en) | 2021-04-25 | 2021-04-25 | Current shunt circuit suitable for LED deep dimming |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110449938.1A CN113133156B (en) | 2021-04-25 | 2021-04-25 | Current shunt circuit suitable for LED deep dimming |
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| CN113133156A true CN113133156A (en) | 2021-07-16 |
| CN113133156B CN113133156B (en) | 2024-01-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114143927A (en) * | 2021-10-19 | 2022-03-04 | 深圳拓邦股份有限公司 | Energy-saving LED light depth adjusting circuit |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102724797A (en) * | 2012-06-26 | 2012-10-10 | 深圳市明微电子股份有限公司 | Light emitting diode (LED) drive circuit and LED lighting device |
| WO2013010351A1 (en) * | 2011-07-15 | 2013-01-24 | 深圳市华星光电技术有限公司 | Pulse width modulation dimming circuit |
| JP2013196759A (en) * | 2012-03-15 | 2013-09-30 | Toshiba Lighting & Technology Corp | Led lighting device and illuminating fixture |
| US20140327366A1 (en) * | 2013-05-03 | 2014-11-06 | Lextar Electronics Corporation | Illumination device and led dimming circuit thereof |
| CN106455216A (en) * | 2016-10-19 | 2017-02-22 | 东南大学 | Silicon controlled rectifier dimming control system for LED brightness adjustment |
| CN106604473A (en) * | 2017-01-04 | 2017-04-26 | 山东中大电源科技有限公司 | LED driving power supply capable of closing through light adjusting |
| CN206370965U (en) * | 2016-11-10 | 2017-08-01 | 深圳市朗科智能电气股份有限公司 | 0~10V LED dim signals change-over circuits and LED power light adjusting circuit |
| CN110572897A (en) * | 2019-08-20 | 2019-12-13 | 深圳市晟碟半导体有限公司 | High-power-factor stroboflash-free LED dimming circuit, device and dimming method |
| CN111343764A (en) * | 2020-03-05 | 2020-06-26 | 深圳市晟碟半导体有限公司 | LED dimming circuit, device and dimming method thereof |
| CN112512178A (en) * | 2020-11-12 | 2021-03-16 | 深圳智芯半导体科技有限公司 | Linear constant-current driving PWM dimming fast response control circuit |
-
2021
- 2021-04-25 CN CN202110449938.1A patent/CN113133156B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013010351A1 (en) * | 2011-07-15 | 2013-01-24 | 深圳市华星光电技术有限公司 | Pulse width modulation dimming circuit |
| JP2013196759A (en) * | 2012-03-15 | 2013-09-30 | Toshiba Lighting & Technology Corp | Led lighting device and illuminating fixture |
| CN102724797A (en) * | 2012-06-26 | 2012-10-10 | 深圳市明微电子股份有限公司 | Light emitting diode (LED) drive circuit and LED lighting device |
| US20140327366A1 (en) * | 2013-05-03 | 2014-11-06 | Lextar Electronics Corporation | Illumination device and led dimming circuit thereof |
| CN106455216A (en) * | 2016-10-19 | 2017-02-22 | 东南大学 | Silicon controlled rectifier dimming control system for LED brightness adjustment |
| CN206370965U (en) * | 2016-11-10 | 2017-08-01 | 深圳市朗科智能电气股份有限公司 | 0~10V LED dim signals change-over circuits and LED power light adjusting circuit |
| CN106604473A (en) * | 2017-01-04 | 2017-04-26 | 山东中大电源科技有限公司 | LED driving power supply capable of closing through light adjusting |
| CN110572897A (en) * | 2019-08-20 | 2019-12-13 | 深圳市晟碟半导体有限公司 | High-power-factor stroboflash-free LED dimming circuit, device and dimming method |
| CN111343764A (en) * | 2020-03-05 | 2020-06-26 | 深圳市晟碟半导体有限公司 | LED dimming circuit, device and dimming method thereof |
| CN112512178A (en) * | 2020-11-12 | 2021-03-16 | 深圳智芯半导体科技有限公司 | Linear constant-current driving PWM dimming fast response control circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114143927A (en) * | 2021-10-19 | 2022-03-04 | 深圳拓邦股份有限公司 | Energy-saving LED light depth adjusting circuit |
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| CN113133156B (en) | 2024-01-26 |
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