CN113133156B - Current shunt circuit suitable for LED deep dimming - Google Patents
Current shunt circuit suitable for LED deep dimming Download PDFInfo
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- CN113133156B CN113133156B CN202110449938.1A CN202110449938A CN113133156B CN 113133156 B CN113133156 B CN 113133156B CN 202110449938 A CN202110449938 A CN 202110449938A CN 113133156 B CN113133156 B CN 113133156B
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- 238000006243 chemical reaction Methods 0.000 description 7
- 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
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
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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 utility model provides a current shunt circuit suitable for LED deep dimming, which 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; the grid electrode of the second MOS tube is connected with a voltage signal; the source electrode of the second MOS tube is grounded. The utility model utilizes a current subtraction mode to additionally extract one path of current to reduce the current quantity flowing through the LED in a current summation mode, thereby realizing the detailed dimming function. Compared with the traditional dimming mode, the utility model can realize detail low-stage dimming, has lower dimming, and can select the function with or without pinching.
Description
Technical Field
The utility model relates to the field of dimming, in particular to a current shunt circuit suitable for LED deep dimming.
Background
The current of the LED is directly regulated in the existing LED dimming mode, but the dimming depth of the dimming mode is insufficient.
The patent document CN206370965U discloses a 0-10V LED dimming signal conversion circuit and an LED power dimming circuit. A driving signal for converting a 0-10V dimming signal into a control chip of an LED power dimming circuit, comprising: the power supply input end is used for receiving an input power supply to be used 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 the 0-10V dimming signal; the other side of the isolation element is connected with the conversion module and the power input end; the isolation element is used for carrying out equal-ratio isolation on the voltage of the 0-10V dimming signal and then is used as the input voltage of the conversion module; and the conversion module is used for converting the input voltage into a driving signal with target voltage and outputting the driving signal to the control chip. The 0-10V LED dimming signal conversion circuit does not relate to a complex singlechip technology or a conventional analog PWM (pulse-Width modulation) dimming signal conversion circuit, and the whole circuit has a simple structure and low cost. But the above solution cannot realize the problem of dimming depth.
Disclosure of Invention
Aiming at the defects in the prior art, the utility model aims to provide a current shunt circuit suitable for LED deep dimming.
The utility model provides a current shunt circuit suitable for LED deep dimming, which 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;
the 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 the dimming signal.
Preferably, the LED lamp comprises an MR16 LED lamp.
Preferably, the semiconductor device further comprises a second operational amplifier, and the output end of the second operational amplifier is connected to the grid electrode of the second MOS tube.
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 tube.
Compared with the prior art, the utility model has the following beneficial effects:
1. the utility model utilizes a current subtraction mode to additionally extract one path of current to reduce the current quantity flowing through the LED in a current summation mode, thereby realizing the detailed dimming function.
2. Compared with the traditional dimming mode, the utility model can realize detail low-stage dimming, has lower dimming, and can select the function with or without pinching.
Drawings
Other features, objects and advantages of the present utility model will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
fig. 1-3 are schematic diagrams of current splitting circuits suitable for LED deep dimming.
Fig. 4 is a circuit diagram of a dimming signal adjustment circuit of the dimming dependent signal Vref.
Fig. 5 is a circuit diagram of the dimming signal adjustment circuit of the dimming dependent signal Vref when pinching off.
Fig. 6 is a circuit diagram of the dimming signal adjustment circuit for adjusting the phase-time dimming dependent signal Vref after the current summation and addition.
Detailed Description
The present utility model will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present utility model, but are not intended to limit the utility model in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present utility model.
The conventional dimming method is further represented by vref=f (VC 2) by one reference voltage signal. That is, the dimming signal Vref is a multi-phase component related to VC 2. Represented here as a constant current from VBUS to the next, and controlled by OP (operational amplifier).
The utility model makes I in a way that the sum of the current of the circuit is unchanged IN ＝I LED +I BLD Output current I LED Can be represented as I LED ＝I IN -I BLD The circuit for additionally extracting the current can be regarded as a reference current signal or a voltage signal, and then is compared with the reference current signal or the voltage signal, and the reference current signal is weighted and then is converted into the additionally extracted current, so that the load current flowing through the LED is reduced.
Wherein the additional extraction current resulting from the weighting can be expressed as its composition of the currently flowing sampling current signal (VR), can be expressed as I BLD ＝VR*F(x)/R SENSE . 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 method, the problem of insufficient original dimming depth can be solved by additionally extracting total current energy to shunt, 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 LED deep dimming provided by the present utility model includes a constant current power supply, an LED lamp, a first MOS transistor, a second MOS transistor, a first operational amplifier, and a resistor, where: 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; the 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 terminal of the first operational amplifier is connected with the dimming signal. The LED lamp includes an MR16 LED lamp. The second operational amplifier is connected with the grid electrode of the second MOS tube. The non-inverting input terminal of the second operational amplifier is connected to 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, when 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 V BLD ) Then the impedance is reduced due to the modulation of the MOS tube channel, so that V is reduced BLD Pulling down.
As shown in FIG. 5, in one embodiment of the pinching-off method, when the LED is dimmed to a certain extent, no minute current is desired to remain, and when all the remaining current flowing through the LED needs to be pinched off at one time, a large enough I needs to be pulled BLD A current.
FIG. 6 is a current sum and the phase of regulation after addition, it can be seen that the ILED current is due to I BLD A lower dimming current level can be achieved after subtraction.
In the description of the present application, it should 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 the orientations or positional relationships illustrated in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a specific orientation, be configured and operated in a specific orientation, and are not to be construed as limiting the present application.
The foregoing describes specific embodiments of the present utility model. It is to be understood that the utility model is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the utility model. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily without conflict.
Claims (3)
1. The utility model provides a current shunt 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;
the grid electrode of the second MOS tube is connected with a voltage signal; the source electrode of the second MOS tube is grounded;
the second operational amplifier is connected with the grid electrode of the second MOS tube;
the non-inverting input end of the second operational amplifier is connected with a dimming signal VR;
the inverting input end of the second operational amplifier is connected with the source electrode of the second MOS tube;
an additional current is extracted to reduce the current quantity flowing through the LEDs in a current summation mode, and detail dimming is carried out;
by the sum of the currents I IN The unchanged mode is that:
I IN ＝I LED +I BLD
output current I LED Represented as I LED ＝I IN -I BLD The circuit for additionally extracting the current is regarded as a reference current signal or a voltage signal, and then is compared with the reference current signal or the voltage signal, and the reference current signal is weighted and then converted into the additionally extracted current, so that the load current flowing through the LED is reduced;
wherein the additional extraction current generated by the weighting is represented as the current flowing through the sampling current signal VR and its composition is represented as I BLD ＝VR*F(x)/R SENSE Wherein F (x) is a constant term or a polynomial or exponential term of the VR signal, R SENSE The resistance value of the connection resistor between the drain electrode of the second MOS tube and the ground.
2. The current splitting circuit for deep dimming of LEDs of claim 1, wherein the non-inverting input of said first operational amplifier is connected to a dimming signal.
3. The current diversion circuit adapted for LED deep dimming of claim 1, wherein the LED lamp comprises an MR16 LED lamp.
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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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| Application Number | Priority Date | Filing Date | Title |
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| CN202110449938.1A CN113133156B (en) | 2021-04-25 | 2021-04-25 | Current shunt circuit suitable for LED deep dimming |
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| CN113133156A CN113133156A (en) | 2021-07-16 |
| CN113133156B true CN113133156B (en) | 2024-01-26 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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| CN106455216A (en) * | 2016-10-19 | 2017-02-22 | 东南大学 | Silicon controlled rectifier dimming control system for LED brightness adjustment |
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| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI532409B (en) * | 2013-05-03 | 2016-05-01 | 隆達電子股份有限公司 | Illumination device and the led dimming circuit thereof |
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2021
- 2021-04-25 CN CN202110449938.1A patent/CN113133156B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| 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 |
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