CN110461063B - Voltage adjusting circuit, and nonlinear dimming circuit and method for LED illumination - Google Patents
Voltage adjusting circuit, and nonlinear dimming circuit and method for LED illumination Download PDFInfo
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Abstract
The invention relates to the technical field of circuit design, and discloses a voltage adjusting circuit, a nonlinear dimming circuit for LED illumination and a method thereof, wherein the voltage adjusting circuit comprises a summing current mirror circuit, a differential pair bias current mirror circuit, a reference voltage generating circuit, a current-voltage converting circuit and a plurality of gain circuits which are mutually cascaded.
Description
Technical Field
The invention relates to the technical field of circuit design, in particular to a voltage adjusting circuit, a nonlinear dimming circuit for LED illumination and a method.
Background
With the development of LED lighting technology, its advantages are prominent compared with traditional lighting, and LED lamps are gradually replacing traditional lighting in society. It has the following advantages: the manufacturing material is environment-friendly; the particle layout of the LED lamp ensures that less scattering is generated, and the light pollution is greatly reduced; the electric energy is directly converted into light, so that the energy efficiency is high; the manufacturing material is stable and not easy to damage. The optical parameters of the LED lamp mainly include: light intensity, luminous flux, illuminance, luminous efficiency etc. the electricity parameter of LED lamp mainly has: current, voltage, power factor, etc. Generally, because a small change in the forward voltage drop of an LED can cause a large change in the forward current of an LED lamp, the LED lamp adopts a constant current source driving manner to control the brightness. And for users, softer light is more comfortable for human bodies, which requires us to pursue a more appropriate dimming manner. The existing linear dimming circuit controls an output signal through Input voltage, so that the purpose of modulating and outputting LED current and controlling LED brightness is achieved, and the current value of an LED and LD _ Input are in a linear relation. When the control voltage is very low, the control circuit is easily interfered by external noise and flickers; in addition, the output signal is controlled through the duty ratio change of the PWM _ Dim, so that the purpose of modulating the output LED current and controlling the LED brightness is achieved, the current value of the LED is related to the PWM, the PWM frequency easily causes stroboflash, and when the control voltage is low, the LED is easily interfered by external noise and flickers.
Disclosure of Invention
In view of the deficiencies of the prior art, the present invention provides a voltage adjusting circuit, a non-linear dimming circuit for LED lighting and a method thereof, so as to solve the problems in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a voltage regulation circuit configured to match a set circuit gain according to an input voltage value for non-linear regulation of an input voltage for output;
the voltage adjusting circuit comprises a summing current mirror circuit, a differential pair bias current mirror circuit, a reference voltage generating circuit, a current-voltage converting circuit and a plurality of gain circuits which are mutually cascaded;
the gain circuit is used for converting input voltage into a current signal, amplifying the current signal and then sending the current signal to the summing current mirror circuit for accumulation output, the reference voltage generating circuit is used for providing whether the gain circuit is connected with the required reference voltage or not, the differential pair bias current mirror circuit is used for providing bias current required by the gain circuit, and the current-voltage converting circuit is used for converting the output current of the summing current mirror circuit into voltage for output.
Preferably, the gain circuit is a pair of common-source NMOS transistors, drains of the NMOS transistors are respectively connected to a working voltage and a current input end of the summing current mirror circuit, and gates are respectively connected to a voltage input end and the reference voltage generating circuit;
the reference voltage generating circuit is formed by connecting divider resistors with the number matched with that of the gain circuits in series, one end of each divider resistor is connected with a working voltage, the other end of each divider resistor is grounded, and the common end of each adjacent divider resistor is connected with one NMOS tube grid of the corresponding gain circuit;
the differential pair bias current mirror circuit comprises an input NMOS tube and output NMOS tubes, the number of the output NMOS tubes is matched with that of the gain circuits, and the output NMOS tubes are connected into common sources of a pair of NMOS tubes of the gain circuits;
the summing current mirror circuit is composed of a pair of PMOS tubes, and common sources of the PMOS tubes are connected to working voltage;
the current-voltage conversion circuit is a load, and one end of the current-voltage conversion circuit is connected with the current input end of the summing current mirror circuit and is connected with the voltage output end.
The invention also provides a nonlinear dimming circuit for LED illumination, which comprises a comparator circuit, a logic circuit, a gate drive circuit, a switch circuit and a current detection circuit which are sequentially cascaded, and the nonlinear dimming circuit also comprises the voltage regulation circuit, wherein the voltage output end of the voltage regulation circuit is connected to the non-inverting input end of the comparator circuit.
The invention also provides a nonlinear dimming method for LED illumination, which comprises the following steps:
collecting the value range of the input voltage value, and carrying out interval division on the value range according to design requirements;
determining the number of gain circuits according to the divided intervals and setting the gain of each gain circuit;
according to the divided intervals, determining the size of the reference voltage triggered and accessed by each gain circuit, and configuring a reference voltage generating circuit;
a summing current mirror circuit, a differential pair bias current mirror circuit, a current-voltage conversion circuit, a comparator circuit, a logic circuit and a gate drive circuit which are sequentially cascaded are sequentially configured;
inputting a voltage, and performing voltage nonlinear adjustment, specifically comprising:
if Vin < Vref1If A is A1;
if Vref1≤Vin＜Vref2If A is A1+ A2;
if Vref2≤Vin＜Vref3If A is A1+ A2+ A3;
……
if Vrefn-1≤Vin＜VrefnIf A is A1+ A2+ A3+ … … An;
vin is input voltage value, n is number of divided sections, A1, A2, A3 and … … An are gain of gain circuits cascaded in sequence, Vref1、Vref2、Vref3……VrefnThe reference voltage value corresponding to each gain circuit.
Compared with the prior art, the invention has the following beneficial effects:
the voltage adjusting circuit designed by the invention can carry out nonlinear adjustment on an input voltage signal, the innovative design of the voltage adjusting circuit can automatically change the gain and the triggering condition of gain change according to the requirement, so that the applicability and the expansibility of the circuit are better, and on the basis of the voltage adjusting circuit designed by the invention, the invention creatively provides a nonlinear dimming circuit and a method for LED illumination, so that the dimming circuit has good anti-noise performance and is not easy to generate stroboflash, and the defects that the existing LED linear dimming is easy to be interfered by noise and the LED PWM dimming is easy to be interfered by stroboflash and noise are overcome.
Further salient features and significant advances with respect to the present invention over the prior art are described in further detail in the examples section.
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 is a circuit diagram of a voltage regulation circuit of the present invention;
FIG. 2 is a block diagram of a non-linear dimming circuit for LED lighting according to the present invention;
FIG. 3 is a circuit level schematic diagram of a non-linear dimming method for LED lighting according to the present invention;
FIG. 4 is a schematic diagram of a prior art linear dimming circuit;
fig. 5 is a schematic diagram of a PWM switching dimming circuit in the prior art.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
Example 1
Referring to fig. 1, the present embodiment provides a voltage adjustment circuit, configured to match a circuit gain according to an input voltage value, for performing a nonlinear adjustment on an input voltage to output the input voltage;
the voltage adjusting circuit comprises a summing current mirror circuit, a differential pair bias current mirror circuit, a reference voltage generating circuit, a current-voltage converting circuit and a plurality of gain circuits which are mutually cascaded;
in the embodiment, the gain circuit is a pair of NMOS transistors with common sources, the drains of the NMOS transistors are respectively connected to the working voltage and the current input end of the summing current mirror circuit, and the gates are respectively connected to the voltage input end and the reference voltage generating circuit;
the reference voltage generating circuit is formed by connecting divider resistors with the number matched with that of the gain circuits in series, one end of each divider resistor is connected with a working voltage, the other end of each divider resistor is grounded, and the common end of each adjacent divider resistor is connected with one NMOS tube grid in the corresponding gain circuit;
the differential pair bias current mirror circuit comprises an input NMOS tube and output NMOS tubes, the number of the output NMOS tubes is matched with that of the gain circuits, and the output NMOS tubes are connected with a common source of a pair of NMOS tubes of the gain circuits;
the summing current mirror circuit is composed of a pair of PMOS tubes, and common sources of the PMOS tubes are connected to working voltage;
the current-voltage conversion circuit is a load, and one end of the current-voltage conversion circuit is connected with the current input end of the summing current mirror circuit and is connected with the voltage output end;
in this embodiment, the gain circuit is configured to convert an input voltage into a current signal, amplify the current signal, and then send the current signal to the summing current mirror circuit for accumulation output, the reference voltage generation circuit is configured to provide a reference voltage required by whether the gain circuit is connected, the differential pair bias current mirror circuit is configured to provide a bias current required by the gain circuit, and the current-voltage conversion circuit is configured to convert an output current of the summing current mirror circuit into a voltage for output.
Referring to fig. 1, M1, M2, in cooperation with M3, implement the first gain circuit function; m4, M5 realizes the second gain circuit function of A2 by matching with M6, and M7, M8 realizes the third gain circuit function by matching with M9; … M3n +1, M3n +2 cooperate with M3n +3 to realize the function of the nth gain circuit;
the resistor strings R1, R2, R3 … Rn and Rn +1 realize a voltage division function to obtain required reference voltages Verf1, Verf2, Verf3, …, Verfn-1 and Verfn;
m3n +4 and M3n +5 realize the action of a summation current mirror, and the final current mirror conversion current forms a nonlinear new regulation voltage LDnew on an Rn +2 resistor, so that the nonlinear control of the LED current is realized.
When the input voltage LDin is low and is close to Vref1, the first gain circuit is turned on, and all other gain circuits are not in use, and the overall gain is the gain A1 of the first gain circuit;
as the input control voltage LDin increases, approaching Vref2, the first gain circuit remains conductive while the second gain circuit begins to conduct, all other gain circuits are non-conductive, and the overall gain is the sum of the gains of the first and second gain circuits a1+ a 2;
by analogy, the circuit realizes nonlinear gain.
Example 2
Referring to fig. 2 and fig. 3, based on embodiment 1, the present embodiment provides a non-linear dimming circuit for LED lighting, including a comparator circuit, a logic circuit, a gate driving circuit, a switch circuit, and a current detection circuit, which are sequentially connected in series, and a voltage adjustment circuit as described in embodiment 1, wherein a voltage output terminal of the voltage adjustment circuit is connected to a non-inverting input terminal of the comparator circuit; the switching circuit in this embodiment adopts a high-power MOS switch M0, the current detection circuit adopts a current detection resistor Rn +2, and the inverting input terminal of the comparator circuit is connected to the common terminal of the MOS switch M0 and the detection resistor Rn + 2.
Referring to fig. 4, a conventional linear dimming circuit controls an output signal through LD _ Input to achieve the purpose of modulating an output LED current and controlling LED brightness. The current value of the LED is linearly related to LD _ Input.
When the control voltage is very low, the linear dimming circuit is easily interfered by external noise and flickers.
Referring to fig. 5, a conventional PWM switching dimming circuit controls an output signal according to a duty ratio change of PWM _ Dim, so as to achieve the purpose of modulating an output LED current and controlling LED brightness. The current value of the LED is in PWM relation with PWM _ Dim, and the PWM frequency of the switching dimming circuit is easy to cause stroboflash; when the control voltage is low, the control voltage is also easily interfered by external noise, and flicker occurs.
The nonlinear dimming circuit for the LED illumination provided by the embodiment overcomes the defects that the LED linear dimming is easily interfered by noise and the LED PWM dimming is easily strobed and interfered by noise.
Example 3
Referring to fig. 3, based on embodiments 1 and 2, the present embodiment provides a non-linear dimming method for LED lighting, including:
collecting the value range of the input voltage value, and carrying out interval division on the value range according to design requirements;
determining the number of gain circuits according to the divided intervals and setting the gain of each gain circuit;
according to the divided intervals, determining the size of the reference voltage triggered and accessed by each gain circuit, and configuring a reference voltage generating circuit;
a summing current mirror circuit, a differential pair bias current mirror circuit, a current-voltage conversion circuit, a comparator circuit, a logic circuit and a gate drive circuit which are sequentially cascaded are sequentially configured;
inputting a voltage, and performing voltage nonlinear adjustment, specifically comprising:
if Vin < Vref1If A is A1;
if Vref1≤Vin＜Vref2If A is A1+ A2;
if Vref2≤Vin＜Vref3If A is A1+ A2+ A3;
……
if Vrefn-1≤Vin＜VrefnIf A is A1+ A2+ A3+ … … An;
vin is input voltage value, n is number of divided sections, A1, A2, A3 and … … An are gain of gain circuits cascaded in sequence, Vref1、Vref2、Vref3……VrefnThe reference voltage value corresponding to each gain circuit.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (3)
1. A voltage regulation circuit, wherein the voltage regulation circuit is configured to match the set circuit gain according to the magnitude of the input voltage value, and is used for carrying out nonlinear regulation on the input voltage to output;
the voltage adjusting circuit comprises a summing current mirror circuit, a differential pair bias current mirror circuit, a reference voltage generating circuit, a current-voltage converting circuit and a plurality of gain circuits which are mutually cascaded;
the gain circuit is used for converting input voltage into a current signal, amplifying the current signal and then sending the current signal to the summing current mirror circuit for accumulation output, the reference voltage generating circuit is used for providing whether the gain circuit is connected with the required reference voltage or not, the differential pair bias current mirror circuit is used for providing bias current required by the gain circuit, and the current-voltage converting circuit is used for converting the output current of the summing current mirror circuit into voltage for output;
the gain circuit is a pair of NMOS tubes with common sources, the drains of the NMOS tubes are respectively connected to the working voltage and the current input end of the summing current mirror circuit, and the gates are respectively connected to the voltage input end and the reference voltage generating circuit;
the reference voltage generating circuit is formed by connecting divider resistors with the number matched with that of the gain circuits in series, one end of each divider resistor is connected with a working voltage, the other end of each divider resistor is grounded, and the common end of each adjacent divider resistor is connected with one NMOS tube grid of the corresponding gain circuit;
the differential pair bias current mirror circuit comprises an input NMOS tube and output NMOS tubes, the number of the output NMOS tubes is matched with that of the gain circuits, and the output NMOS tubes are connected into common sources of a pair of NMOS tubes of the gain circuits;
the summing current mirror circuit is composed of a pair of PMOS tubes, and common sources of the PMOS tubes are connected to working voltage;
the current-voltage conversion circuit is a load, and one end of the current-voltage conversion circuit is connected with the current input end of the summing current mirror circuit and is connected with the voltage output end.
2. A nonlinear dimming circuit for LED illumination, which comprises a comparator circuit, a logic circuit, a gate drive circuit, a switch circuit and a current detection circuit which are sequentially cascaded, and is characterized by further comprising a voltage regulation circuit according to claim 1, wherein a voltage output end of the voltage regulation circuit is connected to a non-inverting input end of the comparator circuit.
3. A method of non-linear dimming of a voltage regulation circuit for LED lighting according to claim 1, comprising:
collecting the value range of the input voltage value, and carrying out interval division on the value range according to design requirements;
determining the number of gain circuits according to the divided intervals and setting the gain of each gain circuit;
according to the divided intervals, determining the size of the reference voltage triggered and accessed by each gain circuit, and configuring a reference voltage generating circuit;
a summing current mirror circuit, a differential pair bias current mirror circuit, a current-voltage conversion circuit, a comparator circuit, a logic circuit and a gate drive circuit which are sequentially cascaded are sequentially configured;
inputting a voltage, and performing voltage nonlinear adjustment, specifically comprising:
if Vin < Vref1Then a = a 1;
if Vref1≤Vin＜Vref2Then a = a1+ a 2;
if Vref2≤Vin＜Vref3Then a = a1+ a2+ A3;
……
if Vrefn-1≤Vin＜VrefnThen a = a1+ a2+ A3+ … … An;
vin is input voltage value, n is number of divided sections, A1, A2, A3 and … … An are gain of gain circuits cascaded in sequence, Vref1、Vref2、Vref3……VrefnThe reference voltage value corresponding to each gain circuit is obtained;
and A is the sum of the gain circuits which are sequentially cascaded A1, A2, A3 and … … An.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203632941U (en) * | 2013-12-20 | 2014-06-04 | 易美芯光（北京）科技有限公司 | LED drive circuit structure with separated switching tube |
| US8947407B2 (en) * | 2011-09-30 | 2015-02-03 | Advanced Analogic Technologies Incorporated | Low cost LED driver with integral dimming capability |
| CN107770909A (en) * | 2017-10-19 | 2018-03-06 | 东莞市翔实信息科技有限公司 | Linear constant current electro-optic drive circuit, integrated circuit and control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9018851B1 (en) * | 2010-08-24 | 2015-04-28 | Cirrus Logic, Inc | Boost and linear LED control |
| WO2016070150A1 (en) * | 2014-10-31 | 2016-05-06 | Sagem Avionics Llc. | System for adaptive non-linear light dimming of electro-optical devices |
| US9730301B2 (en) * | 2015-11-06 | 2017-08-08 | Eptronics, Inc | Wireless lighting control module associated with a relay for controlling lighting power output |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8947407B2 (en) * | 2011-09-30 | 2015-02-03 | Advanced Analogic Technologies Incorporated | Low cost LED driver with integral dimming capability |
| CN203632941U (en) * | 2013-12-20 | 2014-06-04 | 易美芯光（北京）科技有限公司 | LED drive circuit structure with separated switching tube |
| CN107770909A (en) * | 2017-10-19 | 2018-03-06 | 东莞市翔实信息科技有限公司 | Linear constant current electro-optic drive circuit, integrated circuit and control system |
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