WO2019205818A1 - 一种降低谐波失真的led调光电路、调光装置及调光方法 - Google Patents

一种降低谐波失真的led调光电路、调光装置及调光方法 Download PDF

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WO2019205818A1
WO2019205818A1 PCT/CN2019/077115 CN2019077115W WO2019205818A1 WO 2019205818 A1 WO2019205818 A1 WO 2019205818A1 CN 2019077115 W CN2019077115 W CN 2019077115W WO 2019205818 A1 WO2019205818 A1 WO 2019205818A1
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Prior art keywords
module
dimming
voltage
led
harmonic distortion
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PCT/CN2019/077115
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English (en)
French (fr)
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麦炎全
郭友
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深圳市晟碟半导体有限公司
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Priority to EP19793821.0A priority Critical patent/EP3790360A4/en
Publication of WO2019205818A1 publication Critical patent/WO2019205818A1/zh

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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
    • H05B45/36—Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]
    • 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]
    • 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
    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/175—Controlling the light source by remote control
    • H05B47/19—Controlling the light source by remote control via wireless transmission

Definitions

  • the invention relates to the technical field of LEDs, in particular to an LED dimming circuit, a dimming device and a dimming method for reducing harmonic distortion.
  • the linear constant current drives the LED lamp, although the current flowing through the LED lamp is constant, which is caused by the rectifier bridge converting the negative half cycle of the alternating current into a positive voltage, but if the current is observed from the neutral or the live wire, the current will be The positive current is reversed to a negative current, at which point higher harmonics of the current are introduced, interfering with the grid.
  • the general linear LED driving method must meet the specifications of each harmonic distortion. It is necessary to use the dimming circuit to use the voltage division of the alternating current as the reference voltage of the dimming to realize the synchronous change of the current and the alternating voltage, without pros and cons.
  • the step jump of the current does not introduce higher harmonics. However, it also occupies the dimming circuit, so that it can only dim, but the harmonic distortion is high; or it can not be dimmed, but the harmonic distortion is low.
  • an object of the present invention is to provide an LED dimming circuit, a dimming device and a dimming method for reducing harmonic distortion, which can simultaneously meet the requirements of low dimming and harmonic distortion, so that At the same time of dimming, no higher harmonics are introduced, the grid interference is reduced, and the working stability of the product is improved.
  • An LED dimming circuit for reducing harmonic distortion comprising a voltage dividing module, a multi-path selecting module, a dimming decoding module and a constant current source module; the voltage dividing module divides the line voltage and outputs through different taps Corresponding amplitude voltage signal to the multi-path selection module; the dimming decoding module decodes the output luminance data according to the received dimming input signal to the multi-path selection module; and the multi-channel selection module divides the voltage according to the luminance data The voltage signal outputted by the module corresponding to the tap is output to the constant current source module, and the constant current source module controls the current of the flow LED string according to the currently received voltage signal.
  • the voltage dividing module includes a resistor string, the resistor string is composed of a plurality of voltage dividing resistors connected in series, and an upper end of the resistor string is connected to a line voltage output end, The lower end of the resistor string is grounded; the lower end tap of each voltage dividing resistor is respectively connected to the multi-path selection module.
  • the dimming decoding module is specifically configured to perform analog-to-digital conversion on the received analog dimming signal and output the digital signal to the multi-path selection module.
  • the dimming decoding module is specifically configured to perform duty ratio judgment on the received PWM signal, and output the obtained duty ratio data to the multi-path selection module.
  • the dimming decoding module is specifically configured to directly receive luminance data by wired or wireless communication and output the same to a multiplexing module.
  • the multiple selection module includes a plurality of switches corresponding to the voltage dividing resistors, and one end of each switch corresponds to a lower tap of a voltage dividing resistor, and each switch The other end is connected to the constant current source module, and the control end of each switch is connected to the dimming decoding module.
  • the multiple selection module further includes an encoder, and an input end of the encoder is connected to the dimming decoding module, and several outputs of the encoder Corresponding to the control terminal of each switch.
  • the constant current source module includes an operational amplifier, a first MOS transistor and a sampling resistor; and the non-inverting input terminal of the operational amplifier is a control end of the constant current source module Connecting the multi-channel selection module, the inverting input terminal of the operational amplifier is connected to the source of the first MOS transistor and one end of the sampling resistor, and the output end of the operational amplifier is connected to the gate of the first MOS transistor; The drain of the first MOS transistor is connected to the cathode of the LED string; the other end of the sampling resistor is grounded.
  • An LED dimming method for reducing harmonic distortion comprising the following steps:
  • the voltage divider is divided by the voltage dividing module to output a voltage signal corresponding to the amplitude through different taps to the multi-path selection module;
  • the dimming decoding module decodes the output luminance data to the multi-path selection module according to the received dimming input signal
  • the constant current source module controls the current of the stream LED string according to the currently received voltage signal.
  • An LED dimming device includes a casing in which a PCB board is disposed, and the PCB board is provided with an LED dimming circuit for reducing harmonic distortion as described above.
  • the LED dimming circuit for reducing harmonic distortion comprises a voltage dividing module and a multi-path selecting module.
  • the dimming decoding module and the constant current source module The dimming decoding module and the constant current source module; the voltage dividing signal is divided by the voltage dividing module, and the voltage signal corresponding to the amplitude is output to the multi-path selection module through different taps; the dimming decoding module is based on the received dimming
  • the input signal decodes the output luminance data to the multi-path selection module; the multi-channel selection module outputs the voltage signal corresponding to the tap output of the voltage divider module to the constant current source module according to the brightness data, and the constant current source module receives the current according to the current
  • the voltage signal controls the current flowing through the LED string.
  • the invention can simultaneously meet the requirements of low dimming and harmonic distortion, so that high-order harmonics are not introduced at the same time of dimming, power grid interference is reduced, and product working stability is improved.
  • 1 is a circuit diagram of a prior art linear LED driver.
  • FIG. 2 is a structural block diagram of an LED dimming circuit for reducing harmonic distortion provided by the present invention.
  • FIG. 3 is a circuit diagram of a first preferred embodiment of an LED dimming circuit for reducing harmonic distortion provided by the present invention.
  • FIG. 4 is a circuit diagram of a second preferred embodiment of an LED dimming circuit for reducing harmonic distortion provided by the present invention.
  • FIG. 5 is a circuit diagram of a third preferred embodiment of an LED dimming circuit for reducing harmonic distortion according to the present invention.
  • FIG. 6 is a flowchart of a method for dimming an LED for reducing harmonic distortion according to the present invention.
  • the object of the present invention is to provide an LED dimming circuit, a dimming device and a dimming method for reducing harmonic distortion, which can simultaneously satisfy
  • the need for low dimming and harmonic distortion makes it possible to introduce high-order harmonics while dimming, reduce grid interference, and improve product stability.
  • the LED dimming circuit for reducing harmonic distortion provided by the present invention is connected to an LED light string, and includes a rectifier module 50, a voltage dividing module 10, a multiplexing module 20, a dimming decoding module 30, and a constant current source.
  • the input end of the rectifier module 50 is connected to the alternating current
  • the output end of the rectifier module 50 is connected to the positive pole of the voltage dividing module 10 and the LED light string
  • the voltage dividing module 10 respectively leads to several taps and multiple selection modules.
  • 20 is connected, and the multiplex selection module is further connected to the control end of the constant current source module 40 and the dimming decoding module 30.
  • the rectifier circuit 50 rectifies the input alternating current and outputs the line voltage. After the voltage dividing module 10 divides the line voltage, the voltage signal corresponding to the amplitude is output to the multiple selection module 20 through different taps. And receiving, by the dimming decoding module 30, the dimming input signal, decoding the output luminance data according to the dimming input signal to the multiplexing module 20, and the multiplexing module 20 is configured to divide the voltage module according to the brightness data.
  • the voltage signal corresponding to the tap output is output to the constant current source module 40, and the constant current source module 40 controls the current of the stream LED string according to the currently received voltage signal, that is, each tap of the voltage dividing module 10 outputs different amplitudes.
  • the voltage signal, and the periodic phase of each voltage signal is the same as the line voltage Vac.
  • the multiplexer selects one of the tapped voltage outputs to the constant current source module according to the brightness data output by the dimming decoding module 30.
  • 40 can achieve high-order harmonics without dimming, while meeting the needs of dimming and low harmonic distortion, improving product performance and For stability.
  • the voltage dividing module 10 includes a resistor string, and the resistor string is composed of a plurality of voltage dividing resistors in series, as shown by Rh, R1, R2, ..., Rn-1, Rn in the figure, and the specific voltage is divided.
  • the number of resistors can be selected according to actual dimming requirements. The present invention is not limited thereto.
  • the upper end of the resistor string is connected to the line voltage output end, and the lower end of the resistor string is grounded; the lower end taps of each voltage dividing resistor are respectively led out and
  • the multiplex selection module 20 is connected, that is, the present invention divides the line voltage by a plurality of voltage dividing resistors, and the lower end tap of each voltage dividing resistor outputs voltage signals of different amplitudes, and the multiplexer controls each path
  • the turn-on and turn-off of the tap selects the voltage signal outputted to the constant current source module 40, thereby implementing the dimming control, and since the periodic phase of the voltage signal obtained during the voltage division process is the same as the line voltage, the LED light finally flows.
  • the current of the string does not contain components of other frequencies, so that high-order harmonics are not introduced while dimming is implemented, which effectively reduces grid interference during LED operation.
  • the dimming input signal can have various options, such as an analog dimming signal including an analog voltage and an analog current, a PWM signal, and a wired or wireless signal such as SPI, I2C, UART, WiFi, Bluetooth, etc., depending on the specific The product requirements are selected.
  • the dimming decoding module 30 in the LED dimming circuit for reducing harmonic distortion provided by the present invention, the dimming decoding module 30 also has various implementation manners.
  • the dimming input signal is an analog dimming signal. It should be noted that, in this embodiment, only five voltage dividing resistors are used to realize five levels of brightness adjustment for explanation. Note that, of course, the number of voltage dividing resistors can be adjusted as needed in other embodiments.
  • the dimming decoding module 30 can be implemented by an analog-to-digital converter, which is specifically configured to perform analog-to-digital conversion on the received analog dimming signal, and then output a digital signal to the multi-path selection module 20, that is, the modulus
  • the digital signal obtained after the conversion is output to the multiplex selection module 20 as luminance data, and the multiplex selection module 20 selects one of the taps to be turned on according to the digital signal, and outputs the corresponding voltage signal to the constant current source module 40.
  • the multiple selection module 20 includes a plurality of switches corresponding to the voltage dividing resistors, as shown by K1 to K5 in FIG. 3, and one end of each switch corresponds to a lower tap connected to a voltage dividing resistor. The other end of each switch is connected to the constant current source module 40, and the control end of each switch is connected to the dimming decoding module 30.
  • the switch can be implemented by a relay, a triode, a MOSFET, a transmission gate, or the like.
  • the multiplexer module 20 further includes an encoder 21, and an input end of the encoder 21 is connected to the dimming decoding module 30, and a plurality of outputs of the encoder 21 are connected to each switch.
  • the console That is, after receiving the luminance data output by the dimming decoding module 30, the encoder 21 encodes the luminance data to respectively control the closing of each switch to implement dimming.
  • the constant current source module 40 includes an operational amplifier A1, a first MOS transistor Q1, and a sampling resistor Rcs.
  • the non-inverting input terminal of the operational amplifier A1 is a control terminal of the constant current source module 40.
  • the multiplexer input terminal 20 is connected to the input terminal of the first MOS transistor Q1 and one end of the sampling resistor Rcs.
  • the output terminal of the operational amplifier A1 is connected to the first MOS transistor Q1.
  • a gate of the first MOS transistor Q1 is connected to a cathode of the LED string; and the other end of the sampling resistor Rcs is grounded.
  • the resistor strings Rh and R1 to R4 of the voltage dividing module 10 divide the line voltage Vac, and respectively obtain five voltage signals, namely, V1 to V5, where:
  • V1 (R1+R2+R3+R4)/(Rh+R1+R2+R3+R4)*Vac;
  • V2 (R2+R3+R4)/(Rh+R1+R2+R3+R4)*Vac;
  • V3 (R3+R4)/(Rh+R1+R2+R3+R4)*Vac
  • V4 (R4)/(Rh+R1+R2+R3+R4)*Vac
  • Vmax is the peak voltage
  • ⁇ is the angular frequency
  • t is the time.
  • the analog-to-digital converter in this embodiment is a 3-bit analog-to-digital conversion with a measurement range of 0V to Vfs, and the analog dimming signal Vdim is converted into a binary number of 000, 001, ..., 111 and transmitted to the multiplex.
  • the module 20 is selected, and the multiplex selection module 20 is composed of five switches and an encoder 21, which encodes the received 3-bit digital signal and converts it into a 5-bit hot single code, each bit separately Control a switch, specifically using a unique thermal encoding, for example, 000 is encoded as 00001; 001 and 010 are both encoded as 00010; 011 and 100 are both encoded as 00100; 101 and 110 are both encoded as 01000; 111 is encoded as 10000.
  • , it can be seen that the current of the LED string does not contain other frequencies. Component, so there is no harmonic distortion; when the input Vdim 0V, the ADC output is 000, and the hot single code encoder 21 outputs 00001.
  • Vref V5
  • the dimming input signal is an analog dimming signal, which is different from the first preferred embodiment in that the dimming is performed in this embodiment.
  • the decoding module 30 is implemented by a duty ratio determiner, which is specifically configured to perform duty ratio determination on the received PWM signal, and output the obtained duty ratio data to the multiple selection module 20, that is, the duty ratio of the PWM signal.
  • the data is output as a brightness output to the multiplex selection module 20 to implement dimming control.
  • the duty ratio determinator is composed of a sampling clock and a counter. It is assumed that the PWM signal is sampled N times in one cycle, and the counter counts the PWM signal within one cycle.
  • the duty ratio of the current PWM signal can be obtained as the brightness data, and the brightness data is transmitted to the encoder 21 in the multiplex selection module 20 for encoding, and then the corresponding partial voltage can be selected.
  • the signal is used as the reference voltage Vref of the constant current source module 40.
  • the specific coding rule is similar to that in the first preferred embodiment. It will not be described in detail here, and the dimming can also be implemented without introducing high order. harmonic.
  • the dimming input signal is a wired or wireless signal
  • the dimming decoding module is different from the first preferred embodiment.
  • 30 is implemented by a serial interface such as a Bluetooth module, a WiFi module, or an SPI, and is specifically configured to directly receive the brightness data by wired or wireless communication and output the same to the multiplex selection module 20.
  • the Bluetooth signal is taken as an example for description.
  • the brightness data sent by the external Bluetooth controller is directly received by the Bluetooth module, and the data is transmitted to the multiplex selection module 20.
  • the multiplex selection module 20 selects the corresponding resistor divider output to the control terminal of the constant current source module 40 as its reference voltage. Vref, in turn, achieves control of the LED string current. Since the hot single code can be directly sent as the brightness data when the data is transmitted by the Bluetooth, the multiplex selection module 20 in the embodiment may not need to set the encoder 21.
  • the constant current source module 40 can also be implemented by a current mirror, which includes a second MOS transistor Q2 and a third MOS transistor Q3.
  • the drain of the second MOS transistor Q2 is controlled by a constant voltage source module.
  • the terminal is connected to the gate of the second MOS transistor Q2 and the gate of the third MOS transistor Q3, the source of the second MOS transistor Q2 and the source of the third MOS transistor Q3 are grounded, and the third MOS transistor The drain of Q3 is connected to the cathode of the LED string.
  • the present invention also provides an LED dimming method for reducing harmonic distortion.
  • the LED dimming method for reducing harmonic distortion includes the following steps:
  • the dimming decoding module decodes the output luminance data according to the received dimming input signal to the multiple selection module.
  • the multi-channel selection module outputs, according to the brightness data, a voltage signal output by the voltage tapping module corresponding to the tap to the constant current source module;
  • the constant current source module controls current of the flow LED string according to the currently received voltage signal.
  • the invention further provides an LED dimming device, comprising a casing, wherein the casing is provided with a PCB board, and the PCB board is provided with an LED dimming circuit for reducing harmonic distortion as described above, since The LED dimming circuit for reducing harmonic distortion is described in detail and will not be described in detail herein.
  • the LED dimming circuit for reducing harmonic distortion comprises a voltage dividing module, a multi-channel selecting module, and a tuning The optical decoding module and the constant current source module; the voltage dividing signal is divided by the voltage dividing module, and the voltage signal corresponding to the amplitude is output to the multiple selection module through different taps; the dimming decoding module is based on the received dimming input signal Decoding output luminance data to the multi-path selection module; the multi-channel selection module outputs a voltage signal corresponding to the tap output of the voltage divider module to the constant current source module according to the brightness data, and the constant current source module is based on the currently received voltage The signal controls the current flowing through the LED string.
  • the invention can simultaneously meet the requirements of low dimming and harmonic distortion, so that high-order harmonics are not introduced at the same time of dimming, power grid interference is reduced, and product working stability is improved.

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  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
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Abstract

本发明公开了一种降低谐波失真的LED调光电路、调光装置及调光方法，其中，所述降低谐波失真的LED调光电路包括分压模块、多路选择模块、调光译码模块和恒流源模块；由分压模块对线电压进行分压后通过不同的抽头输出对应幅值的电压信号至多路选择模块；调光译码模块根据接收到的调光输入信号译码输出亮度数据至所述多路选择模块；由多路选择模块根据所述亮度数据将分压模块对应抽头输出的电压信号输出至恒流源模块，恒流源模块根据当前接收到的电压信号控制流LED灯串的电流。本发明能同时满足调光和谐波失真低的需求，使得在调光的同时不引入高次谐波，减少电网干扰，提高产品的工作稳定性。

Description

一种降低谐波失真的LED调光电路、调光装置及调光方法 技术领域
本发明涉及LED技术领域，特别涉及一种降低谐波失真的LED调光电路、调光装置及调光方法。
背景技术
线性恒流驱动LED灯，虽然流过LED灯的电流是恒定的，这是整流桥将交流电的负半周期转换正电压导致的，但是如果从零线或火线上观察电流就会发现电流会由正电流翻转为负电流，此时会引入电流的高次谐波，干扰电网。
如图1所示，一般线性LED驱动方法要满足各次谐波失真的规范，需要利用调光电路把交流电的分压作为调光的参考电压实现电流与交流电压同步变化，不会出现正反电流的阶跃跳变，就不会引入高次谐波。但也因此占用了调光电路，使得要么只能调光，但谐波失真高；要么不能调光，但谐波失真低。
因而现有技术还有待改进和提高。
发明内容
鉴于上述现有技术的不足之处，本发明的目的在于提供一种降低谐波失真的LED调光电路、调光装置及调光方法，能同时满足调光和谐波失真低的需求，使得在调光的同时不引入高次谐波，减少电网干扰，提高产品的工作稳定性。
为了达到上述目的，本发明采取了以下技术方案：
一种降低谐波失真的LED调光电路，其包括分压模块、多路选择模块、调光译码模块和恒流源模块；由分压模块对线电压进行分压后通过不同的抽头输出对应幅值的电压信号至多路选择模块；调光译码模块根据接收到的调光输入信号译码输出亮度数据至所述多路选择模块；由多路选择模块根据所述亮度数据将分压模块对应抽头输出的电压信号输出至恒流源模块，恒流源模块根据当前接收到的电压信号控制流LED灯串的电流。
所述的降低谐波失真的LED调光电路中，所述分压模块包括电阻串，所述电阻串由若干个分压电阻串联构成，所述电阻串的上端连接线电压输出端，所述 电阻串的下端接地；每个分压电阻的下端抽头分别引出与所述多路选择模块连接。
所述的降低谐波失真的LED调光电路中，所述调光译码模块具体用于对接收到的模拟调光信号进行模数转换后输出数字信号至多路选择模块。
所述的降低谐波失真的LED调光电路中，所述调光译码模块具体用于对接收到的PWM信号进行占空比判断，并将得到的占空比数据输出至多路选择模块。
所述的降低谐波失真的LED调光电路中，所述调光译码模块具体用于通过有线或无线通信直接接收亮度数据并将其输出至多路选择模块。
所述的降低谐波失真的LED调光电路中，所述多路选择模块包括若干个数量与分压电阻对应的开关，每个开关的一端对应连接一个分压电阻的下端抽头，每个开关的另一端均连接恒流源模块，每个开关的控制端均连接所述调光译码模块。
所述的降低谐波失真的LED调光电路中，所述多路选择模块还包括编码器，所述编码器的输入端连接所述调光译码模块，所述编码器的若干个输出端对应连接每个开关的控制端。
所述的降低谐波失真的LED调光电路中，所述恒流源模块包括运算放大器、第一MOS管和采样电阻；所述运算放大器的同相输入端为所述恒流源模块的控制端，连接所述多路选择模块，所述运算放大器的反相输入端连接第一MOS管的源极和采样电阻的一端，所述运算放大器的输出端连接第一MOS管的栅极；所述第一MOS管的漏极连接LED灯串的负极；所述采样电阻的另一端接地。
一种降低谐波失真的LED调光方法，其包括如下步骤：
由分压模块对线电压进行分压后通过不同的抽头输出对应幅值的电压信号至多路选择模块；
调光译码模块根据接收到的调光输入信号译码输出亮度数据至所述多路选择模块；
由多路选择模块根据所述亮度数据将分压模块对应抽头输出的电压信号输出至恒流源模块；
恒流源模块根据当前接收到的电压信号控制流LED灯串的电流。
一种LED调光装置，包括外壳，所述外壳内设置有PCB板，所述PCB板上设置有如上所述的降低谐波失真的LED调光电路。
相较于现有技术，本发明提供的降低谐波失真的LED调光电路、调光装置及调光方法中，所述降低谐波失真的LED调光电路包括分压模块、多路选择模块、调光译码模块和恒流源模块；由分压模块对线电压进行分压后通过不同的抽头输出对应幅值的电压信号至多路选择模块；调光译码模块根据接收到的调光输入信号译码输出亮度数据至所述多路选择模块；由多路选择模块根据所述亮度数据将分压模块对应抽头输出的电压信号输出至恒流源模块，恒流源模块根据当前接收到的电压信号控制流LED灯串的电流。本发明能同时满足调光和谐波失真低的需求，使得在调光的同时不引入高次谐波，减少电网干扰，提高产品的工作稳定性。
附图说明
图1为现有技术中线性LED驱动的电路图。
图2为本发明提供的降低谐波失真的LED调光电路的结构框图。
图3为本发明提供的降低谐波失真的LED调光电路第一较佳实施例的电路图。
图4为本发明提供的降低谐波失真的LED调光电路第二较佳实施例的电路图。
图5为本发明提供的降低谐波失真的LED调光电路第三较佳实施例的电路图。
图6为本发明提供的降低谐波失真的LED调光方法的流程图。
具体实施方式
鉴于现有技术中线性LED驱动无法同时满足调光和谐波失真低等缺点，本发明的目的在于提供一种降低谐波失真的LED调光电路、调光装置及调光方法，能同时满足调光和谐波失真低的需求，使得在调光的同时不引入高次谐波，减少电网干扰，提高产品的工作稳定性。
为使本发明的目的、技术方案及效果更加清楚、明确，以下参照附图并举实 施例对本发明进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本发明，并不用于限定本发明。
请参阅图2，本发明提供的降低谐波失真的LED调光电路与LED灯串连接，包括整流模块50、分压模块10、多路选择模块20、调光译码模块30和恒流源模块40，所述整流模块50的输入端输入交流电，所述整流模块50的输出端连接分压模块10和LED灯串的正极，所述分压模块10分别引出若干个抽头与多路选择模块20连接，所述多路选择模块还连接恒流源模块40的控制端和调光译码模块30。
本发明通过所述整流模块50对输入交流电进行整流后输出线电压，由所述分压模块10对线电压进行分压后，通过不同的抽头输出对应幅值的电压信号至多路选择模块20，并且通过调光译码模块30接收调光输入信号，根据所述调光输入信号译码输出亮度数据至所述多路选择模块20，由多路选择模块20根据所述亮度数据将分压模块10对应抽头输出的电压信号输出至恒流源模块40，恒流源模块40根据当前接收到的电压信号控制流LED灯串的电流，即分压模块10的每个抽头将输出不同幅值的电压信号，且每个电压信号的周期相位均与线电压Vac相同，在调光时，多路选择器根据调光译码模块30输出的亮度数据选择其中一路抽头的电压输出至恒流源模块40作为调光的参考电压，即可实现在调光的同时不引入高次谐波，同时满足了调光和低谐波失真的需求，提升产品性能和工作稳定性。
具体地，所述分压模块10包括电阻串，所述电阻串由若干个分压电阻串联构成，如图中Rh、R1、R2、...、Rn-1、Rn所示，具体分压电阻的数量可根据实际调光需求进行选择，本发明对此不作限定，所述电阻串的上端连接线电压输出端，所述电阻串的下端接地；每个分压电阻的下端抽头分别引出与所述多路选择模块20连接，即本发明通过若干个分压电阻对线电压进行分压，每个分压电阻的下端抽头将输出不同幅值的电压信号，多路选择器通过控制每一路抽头的导通与关闭来选择输出至恒流源模块40的电压信号，进而实现调光控制，且由于分压过程中所得到的电压信号周期相位均与线电压相同，因此最终流过LED灯串的电流不会含有其他频率的分量，使得在实现调光的同时不引入高次谐波，有效减少了LED工作过程中的电网干扰。
具体地，所述调光输入信号可有多种选择，例如包括模拟电压和模拟电流的模拟调光信号、PWM信号以及SPI，I2C，UART，WiFi，蓝牙等有线或无线信号，可根据具体的产品需求进行选择，根据调光输入信号的不同，本发明提供的降低谐波失真的LED调光电路中，所述调光译码模块30也具有多种实现方式。
请参阅图3，本发明第一较佳实施例中，所述调光输入信号为模拟调光信号，需说明的是，本实施例中仅以5个分压电阻实现5级亮度调节进行解释说明，当然，在其他实施例中可根据需要调整分压电阻的数量。本实施例中，所述调光译码模块30可通过模数转换器实现，其具体用于对接收到的模拟调光信号进行模数转换后输出数字信号至多路选择模块20，即将模数转换后得到的数字信号作为亮度数据输出至多路选择模块20，由多路选择模块20根据该数字信号选择其中一路抽头导通，将对应的电压信号输出至恒流源模块40。
进一步地，本实施例中所述多路选择模块20包括若干个数量与分压电阻对应的开关，如图3中K1至K5所示，每个开关的一端对应连接一个分压电阻的下端抽头，每个开关的另一端均连接恒流源模块40，每个开关的控制端均连接所述调光译码模块30。所述开关可通过继电器、三极管、MOSFET、传输门等实现。
更进一步地，所述多路选择模块20还包括编码器21，所述编码器21的输入端连接所述调光译码模块30，所述编码器21的若干个输出端对应连接每个开关的控制端。即编码器21接收到调光译码模块30输出的亮度数据后，对所述亮度数据进行编码，以分别控制每个开关的闭合进而实现调光。
更进一步地，本实施例中所述恒流源模块40包括运算放大器A1、第一MOS管Q1和采样电阻Rcs；所述运算放大器A1的同相输入端为所述恒流源模块40的控制端，连接所述多路选择模块20，所述运算放大器A1的反相输入端连接第一MOS管Q1的源极和采样电阻Rcs的一端，所述运算放大器A1的输出端连接第一MOS管Q1的栅极；所述第一MOS管Q1的漏极连接LED灯串的负极；所述采样电阻Rcs的另一端接地。通过编码器21控制分别控制每个开关的闭合后将对应输出一路电压信号至运算放大器A1的同相输入端，以作为恒流源模块40的参考电压Vref实现LED驱动电流的调节。
具体实施时，本实施例中分压模块10的电阻串Rh、R1～R4对线电压Vac 分压，分别得到五个电压信号，即V1～V5，其中：
V1＝(R1+R2+R3+R4)/(Rh+R1+R2+R3+R4)*Vac；
V2＝(R2+R3+R4)/(Rh+R1+R2+R3+R4)*Vac；
V3＝(R3+R4)/(Rh+R1+R2+R3+R4)*Vac；
V4＝(R4)/(Rh+R1+R2+R3+R4)*Vac；
V5＝0/(Rh+R1+R2+R3+R4)*Vac＝0V；
其中Vac＝|Vmax*sinωt|，Vmax为峰值电压，ω为角频率，t为时间。
假设本实施例中的模数转换器为一个3bit的模数转换，测量范围为0V～Vfs，把模拟调光信号Vdim转换成000，001，...，111的二进制数字后传输给多路选择模块20，而多路选择模块20由五个开关和编码器21组成，所述编码器21将对接收到的3bit数字信号进行编码，将其转换为5bit的热独码，每个比特分别控制一个开关，具体采用独热编码，例如将000编码成00001；001和010都编码成00010；011和100都编码成00100；101和110都编码成01000；111编码成10000。
同时，恒流源模块40的输出电流为Iled＝Vref/Rcs，假设当前输入的Vdim＝0.4Vfs，则ADC输出为011，热独码编码器21输出00100，此时K3导通，其他开关断开，则Vref＝V3，Iled＝V3/Rcs＝(R3+R4)/(Rh+R1+R2+R3+R4)|Vmax*sinωt|，由此可见，LED灯串的电流不含有其他频率的分量，因此没有谐波失真；而当输入Vdim＝0V时，ADC输出为000，热独码编码器21输出00001，此时K5导通，其他开关断开，则Vref＝V5，Iled＝V5/Rcs＝0，由此可见，LED无电流，因此也没有谐波失真。如此类推，只要改变模拟调光信号Vdim的输入电压即可改变流过LED灯串的电流的有效值，从而实现调光，且不会引入高次谐波，同时满足调光和谐波失真低的需求，使得在调光的同时不引入高次谐波，减少电网干扰，提高产品的工作稳定性。
进一步地，请参阅图4，本发明第二较佳实施例中，所述调光输入信号为模拟调光信号，与第一较佳实施例不相同的是，本实施例中所述调光译码模块30通过占空比判断器实现，其具体用于对接收到的PWM信号进行占空比判断，并将得到的占空比数据输出至多路选择模块20，即将PWM信号的占空比数据作为亮度输出输出至多路选择模块20实现调光控制，具体实施时，所述占空比判 断器由采样时钟和计数器组成，假设PWM信号一个周期内采样N次，计数器计数PWM信号一个周期内为高电平被采样到的次数，即可获取当前PWM信号的占空比作为亮度数据，将该亮度数据传输给多路选择模块20中的编码器21进行编码后即可选择对应的分压信号作为恒流源模块40的参考电压Vref，具体的编码规则与第一较佳实施例中类似，此处不再详述，同样也可在实现调光的同时不引入高次谐波。
更进一步地，请参阅图5，本发明第三较佳实施例中，所述调光输入信号为有线或无线信号，与第一较佳实施例不相同的是，所述调光译码模块30通过蓝牙模块、WiFi模块或者SPI等串行接口实现，其具体用于通过有线或无线通信直接接收亮度数据并将其输出至多路选择模块20，本实施例中以蓝牙信号为例进行说明，通过蓝牙模块直接接收外部蓝牙控制器发送的亮度数据，并把数据传输给多路选择模块20，多路选择模块20选择对应的电阻分压输出到恒流源模块40的控制端作为其参考电压Vref，进而实现对LED灯串电流的控制。因为蓝牙发送数据时可以直接发送热独码作为亮度数据，因此本实施例中所述多路选择模块20可以不需要设置编码器21。
并且本实施例中所述恒流源模块40还可通过电流镜来实现，其包括第二MOS管Q2和第三MOS管Q3，所述第二MOS管Q2的漏极为恒压源模块的控制端，其连接第二MOS管Q2的栅极和第三MOS管Q3的栅极，所述第二MOS管Q2的源极和第三MOS管Q3的源极均接地，所述第三MOS管Q3的漏极连接LED灯串的负极。
相应地，本发明还提供一种降低谐波失真的LED调光方法，如图6所示，所述降低谐波失真的LED调光方法包括如下步骤：
S100、由分压模块对线电压进行分压后通过不同的抽头输出对应幅值的电压信号至多路选择模块；
S200、调光译码模块根据接收到的调光输入信号译码输出亮度数据至所述多路选择模块；
S300、由多路选择模块根据所述亮度数据将分压模块对应抽头输出的电压信号输出至恒流源模块；
S400、恒流源模块根据当前接收到的电压信号控制流LED灯串的电流。
本发明还相应提供一种LED调光装置，包括外壳，所述外壳内设置有PCB板，所述PCB板上设置有如上所述的降低谐波失真的LED调光电路，由于上文已对所述降低谐波失真的LED调光电路进行了详细介绍，此处不再详述。
综上所述，本发明提供的降低谐波失真的LED调光电路、调光装置及调光方法中，所述降低谐波失真的LED调光电路包括分压模块、多路选择模块、调光译码模块和恒流源模块；由分压模块对线电压进行分压后通过不同的抽头输出对应幅值的电压信号至多路选择模块；调光译码模块根据接收到的调光输入信号译码输出亮度数据至所述多路选择模块；由多路选择模块根据所述亮度数据将分压模块对应抽头输出的电压信号输出至恒流源模块，恒流源模块根据当前接收到的电压信号控制流LED灯串的电流。本发明能同时满足调光和谐波失真低的需求，使得在调光的同时不引入高次谐波，减少电网干扰，提高产品的工作稳定性。
可以理解的是，对本领域普通技术人员来说，可以根据本发明的技术方案及其发明构思加以等同替换或改变，而所有这些改变或替换都应属于本发明所附的权利要求的保护范围。

Claims (10)

  1. 一种降低谐波失真的LED调光电路，其特征在于，包括分压模块、多路选择模块、调光译码模块和恒流源模块；由分压模块对线电压进行分压后通过不同的抽头输出对应幅值的电压信号至多路选择模块；调光译码模块根据接收到的调光输入信号译码输出亮度数据至所述多路选择模块；由多路选择模块根据所述亮度数据将分压模块对应抽头输出的电压信号输出至恒流源模块，恒流源模块根据当前接收到的电压信号控制流LED灯串的电流。
  2. 根据权利要求1所述的降低谐波失真的LED调光电路，其特征在于，所述分压模块包括电阻串，所述电阻串由若干个分压电阻串联构成，所述电阻串的上端连接线电压输出端，所述电阻串的下端接地；每个分压电阻的下端抽头分别引出与所述多路选择模块连接。
  3. 根据权利要求1所述的降低谐波失真的LED调光电路，其特征在于，所述调光译码模块具体用于对接收到的模拟调光信号进行模数转换后输出数字信号至多路选择模块。
  4. 根据权利要求1所述的降低谐波失真的LED调光电路，其特征在于，所述调光译码模块具体用于对接收到的PWM信号进行占空比判断，并将得到的占空比数据输出至多路选择模块。
  5. 根据权利要求1所述的降低谐波失真的LED调光电路，其特征在于，所述调光译码模块具体用于通过有线或无线通信直接接收亮度数据并将其输出至多路选择模块。
  6. 根据权利要求2所述的降低谐波失真的LED调光电路，其特征在于，所述多路选择模块包括若干个数量与分压电阻对应的开关，每个开关的一端对应连接一个分压电阻的下端抽头，每个开关的另一端均连接恒流源模块，每个开关的控制端均连接所述调光译码模块。
  7. 根据权利要求6所述的降低谐波失真的LED调光电路，其特征在于，所述多路选择模块还包括编码器，所述编码器的输入端连接所述调光译码模块，所述编码器的若干个输出端对应连接每个开关的控制端。
  8. 根据权利要求1所述的降低谐波失真的LED调光电路，其特征在于，所述恒流源模块包括运算放大器、第一MOS管和采样电阻；所述运算放大器的同相输入端为所述恒流源模块的控制端，连接所述多路选择模块，所述运算放大器 的反相输入端连接第一MOS管的源极和采样电阻的一端，所述运算放大器的输出端连接第一MOS管的栅极；所述第一MOS管的漏极连接LED灯串的负极；所述采样电阻的另一端接地。
  9. 一种降低谐波失真的LED调光方法，其特征在于，包括如下步骤：
    由分压模块对线电压进行分压后通过不同的抽头输出对应幅值的电压信号至多路选择模块；
    调光译码模块根据接收到的调光输入信号译码输出亮度数据至所述多路选择模块；
    由多路选择模块根据所述亮度数据将分压模块对应抽头输出的电压信号输出至恒流源模块；
    恒流源模块根据当前接收到的电压信号控制流LED灯串的电流。
  10. 一种LED调光装置，包括外壳，所述外壳内设置有PCB板，其特征在于，所述PCB板上设置有如权利要求1-8任意一项所述的降低谐波失真的LED调光电路。
PCT/CN2019/077115 2018-04-28 2019-03-06 一种降低谐波失真的led调光电路、调光装置及调光方法 WO2019205818A1 (zh)

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