WO2019037437A1 - 电流纹波消除电路 - Google Patents

电流纹波消除电路 Download PDF

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Publication number
WO2019037437A1
WO2019037437A1 PCT/CN2018/082431 CN2018082431W WO2019037437A1 WO 2019037437 A1 WO2019037437 A1 WO 2019037437A1 CN 2018082431 W CN2018082431 W CN 2018082431W WO 2019037437 A1 WO2019037437 A1 WO 2019037437A1
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resistor
current ripple
capacitor
circuit
power tube
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PCT/CN2018/082431
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English (en)
French (fr)
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庄华龙
刘羽
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帝奥微电子有限公司
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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]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter 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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • 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
    • H05B45/395—Linear regulators

Definitions

  • the invention relates to a current ripple cancellation circuit, in particular to a current ripple cancellation circuit for eliminating current ripple of an LED drive system.
  • LED light sources have the characteristics of low power consumption, light weight, and constant current drive.
  • a constant current output is usually used to drive the LED load, and a high power factor is required.
  • the rectifier bridge there is no large electrolytic capacitor, so the low frequency ripple noise caused by the sine wave of the AC grid is transmitted to the output terminal, resulting in The LED light flashes (strobe).
  • the input source frequency is 50 Hz
  • the current output by the constant current driving module contains 100 Hz ripple
  • the voltage on the filter capacitor also contains 100 Hz ripple.
  • the current flowing through the LED load also contains 100 Hz ripple, resulting in a 100 Hz stroboscopic light output from the LED load.
  • it is difficult for human eyes to detect such low-frequency strobes the human eye is exposed to such lighting for a long time, which causes visual nerve fatigue and endangers human health.
  • FIG. 1 is a schematic structural diagram of a conventional current ripple cancellation circuit and an LED control circuit
  • FIG. 2 is an operation waveform of a conventional current ripple cancellation circuit.
  • the current current ripple cancel circuit 1 is connected to the storage capacitor C, the constant current control circuit 2, and the LED load 3, wherein the current ripple cancel circuit 1 has a power tube.
  • the waveforms of Figure 2 represent the voltage of node A1, the current of node A2, and the voltage of the power tube gate A3, respectively.
  • the current ripple elimination circuit 1 of the prior art ensures that the power tube operates in a saturation region, and requires a large external storage capacitor C. As the capacitance of the storage capacitor C increases, its cost increases, and the volume of the capacitor also increases significantly. Large-capacity storage capacitors C may not meet the requirements of new LED luminaires for driving PCB boards. Therefore, how to provide a current ripple cancellation circuit that can suppress ripple and meet the requirements of system cost, efficiency, and versatility is an urgent problem for various industries.
  • the present invention provides a current ripple cancellation circuit including a power transistor, a first resistor, a Zener diode, a first capacitor, and a second resistor.
  • the first end of the first resistor is connected to the drain of the power tube; the cathode of the Zener tube is connected to the second end of the first resistor; the first end of the first capacitor is connected to the anode of the Zener tube and the gate of the power tube.
  • the first end of the second resistor is connected to the gate of the power tube; and wherein the common end of the first end of the first resistor and the drain of the power tube is an input end, and the source of the power tube
  • the common junction of the second end of the two resistors and the second end of the first capacitor is an output.
  • the current ripple cancellation circuit is further coupled to a constant current control circuit, an LED load, and a storage capacitor, wherein the output of the constant current control circuit is coupled to the first end of the storage capacitor to the LED load.
  • the input end of the current ripple cancellation circuit is connected to the output end of the LED load, and the output end of the current ripple cancellation circuit is connected to the loop end of the constant current control circuit and the second end of the storage capacitor.
  • the constant current control circuit is an LED constant current control circuit having a high power factor.
  • the LED load is an LED module that includes one or more LEDs.
  • the current ripple cancellation circuit of the present invention Compared with the prior art, since the power tube in the current ripple cancellation circuit of the present invention operates in a saturation region, the gate voltage ripple of the power tube by the first resistor, the first capacitor, the Zener diode, and the second resistor The filtering process is performed to cause the power transistor to reduce the current ripple of its drain, so that under low current conditions, the current ripple is significantly lower than in the prior art.
  • the current ripple cancellation circuit of the present invention has a simple structure and flexible design, can significantly reduce the system volume and cost, and greatly expand the application field, and fully overcomes the problems in the prior art.
  • FIG. 1 is a schematic structural diagram of a conventional current ripple cancellation circuit and an LED control circuit.
  • FIG. 3 is a schematic structural diagram of a current ripple cancellation circuit and an LED control circuit according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a current ripple cancellation circuit and an LED control circuit according to an embodiment of the present invention.
  • the current ripple cancellation circuit 4 of the present invention includes a power transistor M, a first resistor R1, a Zener diode Z, a first capacitor C1, and a second resistor R2.
  • the first end of the first resistor R1 is connected to the drain of the power tube M; the cathode of the Zener diode Z is connected to the second end of the first resistor R1; the first end of the first capacitor C1 is connected to the Zener Z
  • the anode and the gate of the power tube M are connected; and the first end of the second resistor R2 is connected to the gate of the power tube M; and wherein the common end of the first end of the first resistor R1 and the drain of the power tube M is The input terminal B1, and the source of the power tube M, the second end of the second resistor R2 and the second end of the first capacitor C1 are connected to the output terminal B4.
  • the power tube M can be, for example, an NMOS tube.
  • the power tube M in the current ripple cancellation circuit 4 of the present invention operates in a saturation region, and the gate voltage ripple of the power tube M is performed by the first resistor R1, the first capacitor C1, the Zener diode Z, and the second resistor R2.
  • the filtering process causes the power transistor M to reduce the current ripple of its drain.
  • the current ripple cancellation circuit 4 can also be connected to a constant current control circuit 2, an LED load 3, and a storage capacitor C, wherein the output of the constant current control circuit 2 and the storage capacitor C are The first end is connected to the input end of the LED load 3, the input end B1 of the current ripple canceling circuit 4 is connected to the output end of the LED load 3, and the output end B4 of the current ripple eliminating circuit 4 is connected to the loop end of the constant current control circuit 2 and The second end of the storage capacitor C.
  • the constant current control circuit 4 may be an LED constant current control circuit having a high power factor.
  • the LED load 3 can be an LED module that includes one or more LEDs.
  • FIG. 4 is an operation waveform of the current ripple canceling circuit of the present invention.
  • the waveforms of Figure 4 represent the voltage of node B1, the current of node B2, and the voltage of power tube M gate B3, respectively.
  • the power transistor M operates in a saturation region, and when the gate-source voltage (ie, VGS) of the power transistor M is fixed, its drain current does not vary with the drain-source voltage (ie, VDS).
  • VGS gate-source voltage
  • VDS drain-source voltage
  • the current ripple elimination circuit 4 of the present invention adopts an optimization technology, the full output current range has no distortion, and the zero current ripple of the full output current range can be truly realized, especially in a small current condition, the current ripple is more obvious than the prior art. Decrease.
  • the current ripple cancellation circuit of the present invention since the power tube in the current ripple cancellation circuit of the present invention operates in a saturation region, the gate voltage ripple of the power tube is filtered by the first resistor, the first capacitor, the Zener diode, and the second resistor. The process is such that the power transistor reduces the current ripple at its drain, so current ripple is significantly lower than in the prior art under low current conditions.
  • the current ripple cancellation circuit of the present invention has a simple structure and flexible design, can significantly reduce the system volume and cost, and greatly expand the application field, and fully overcomes the problems in the prior art.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Rectifiers (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

一种电流纹波消除电路，包括功率管、第一电阻、稳压管、第一电容以及第二电阻。其中，第一电阻的第一端与功率管的漏极连接；稳压管的阴极与第一电阻的第二端连接；第一电容的第一端与稳压管的阳极以及功率管的栅极连接；以及第二电阻的第一端与功率管的栅极连接；且其中，第一电阻的第一端与功率管的漏极的共接点为输入端，以及功率管的源极、第二电阻的第二端与第一电容的第二端的共接点为输出端。

Description

电流纹波消除电路 技术领域
本发明涉及电流纹波消除电路，尤指一种应用于消除LED驱动***电流纹波的电流纹波消除电路。
背景技术
一般而言，LED光源具有功耗低、重量轻、需要恒流驱动的特点。现有技术中，通常使用恒流输出来驱动LED负载，同时要求具有高功率因数，整流桥后无大电解电容，故由交流电网的正弦波所引起的低频纹波噪声传递到了输出端，造成LED灯出现闪烁(频闪)问题。例如输入源频率为50Hz，则恒流驱动模块输出的电流含有100Hz的纹波，滤波电容上的电压也含有100Hz的纹波。同时，流过LED负载的电流也含有100Hz的纹波，导致LED负载输出的光含有100Hz的频闪。尽管人的肉眼难以觉察这种低频频闪，但是人眼长期处在这种照明环境下，会造成视觉神经疲劳，危害人体健康。
请参阅图1及图2，图1为现有的电流纹波消除电路及LED控制电路的架构示意图，以及图2为现有的电流纹波消除电路的工作波形。如图1所示，现有的电流纹波消除电路1与储能电容C、恒流控制电路2及LED负载3连接，其中电流纹波消除电路1具有一功率管。图2的波形分别表示节点A1的电压、节点A2的电流以及所述功率管栅极A3的电压。
现有技术的电流纹波消除电路1为保证功率管工作在饱和区，需要外接较大的储能电容C。随着储能电容C容值的增加，其成本会升高，并且电容的体积也会显着增加。大体积的储能电容C可能无法满足新型LED灯具对于驱动PCB板体积的要求。因此，如何提供一种能抑制纹波，并可满足***成本、效率和通用性的要求的电流纹波消除电路，即为各家业者亟待解决的课题。
发明内容
鉴于现有技术的种种缺失，本发明的主要目的，即在于提供一种能抑制纹波，并可满足***成本、效率和通用性的要求的电流纹波消除电路。
为了达到上述目的及其他目的，本发明提供一种电流纹波消除电路，包括功率管、第一 电阻、稳压管、第一电容以及第二电阻。其中，第一电阻的第一端与功率管的漏极连接；稳压管的阴极与第一电阻的第二端连接；第一电容的第一端与稳压管的阳极以及功率管的栅极连接；以及第二电阻的第一端与功率管的栅极连接；且其中，第一电阻的第一端与功率管的漏极的共接点为输入端，以及功率管的源极、第二电阻的第二端与第一电容的第二端的共接点为输出端。
在一实施例中，电流纹波消除电路还与一恒流控制电路、一LED负载以及一储能电容连接，其中，恒流控制电路的输出端与储能电容的第一端连接LED负载的输入端，电流纹波消除电路的输入端连接LED负载的输出端，以及电流纹波消除电路的输出端连接恒流控制电路的回路端与储能电容的第二端。
在一实施例中，恒流控制电路是具备高功率因数的LED恒流控制电路。
在一实施例中，LED负载是包括一个或多个LED的LED模组。
相较于现有技术，由于本发明的电流纹波消除电路中的功率管工作于饱和区，由第一电阻、第一电容、稳压管及第二电阻对功率管的栅极电压纹波进行滤波处理以使功率管减小其漏极的电流纹波，因此在小电流条件下，电流纹波比现有技术显着降低。此外，本发明的电流纹波消除电路结构简单、设计灵活，能够显着降低***体积和成本以及极大扩宽应用领域，充分克服了现有技术中所具有的问题。
附图说明
图1为现有的电流纹波消除电路及LED控制电路的架构示意图。
图2为现有的电流纹波消除电路的工作波形。
图3为本发明一实施例的电流纹波消除电路及LED控制电路的架构示意图。
图4为本发明的电流纹波消除电路的工作波形。
符号说明：
1           现有技术的电流纹波消除电路
2           恒流控制电路
3           LED负载
4           电流纹波消除电路
A1、A2、A3  节点
B1、B2      节点
B3、B4      节点
C           储能电容
C1          第一电容
R1          第一电阻
R2          第二电阻
M           功率管
Z           稳压管
具体实施方式
以下藉由特定的具体实施例说明本发明的实施方式，熟悉此技术的人士可由本说明书所揭示的内容轻易地了解本发明的其他优点与功效。本发明亦可藉由其他不同的具体实施例加以施行或应用。
请参阅图3，图3为本发明一实施例的电流纹波消除电路及LED控制电路的架构示意图。如图所示，本发明的电流纹波消除电路4，包括功率管M、第一电阻R1、稳压管Z、第一电容C1以及第二电阻R2。其中，第一电阻R1的第一端与功率管M的漏极连接；稳压管Z的阴极与第一电阻R1的第二端连接；第一电容C1的第一端与稳压管Z的阳极以及功率管M的栅极连接；以及第二电阻R2的第一端与功率管M的栅极连接；且其中，第一电阻R1的第一端与功率管M的漏极的共接点为输入端B1，以及功率管M的源极、第二电阻R2的第二端与第一电容C1的第二端的共接点为输出端B4。
在一实施例中，功率管M可例如为NMOS管。本发明的电流纹波消除电路4中的功率管M工作于饱和区，由第一电阻R1、第一电容C1、稳压管Z及第二电阻R2对功率管M的栅极电压纹波进行滤波处理以使功率管M减小其漏极的电流纹波。
在一实施例中，电流纹波消除电路4还可与一恒流控制电路2、一LED负载3以及一储能电容C连接，其中，恒流控制电路2的输出端与储能电容C的第一端连接LED负载3的输入端，电流纹波消除电路4的输入端B1连接LED负载3的输出端，以及电流纹波消除电路4的输出端B4连接恒流控制电路2的回路端与储能电容C的第二端。
在一实施例中，恒流控制电路4可以是具备高功率因数的LED恒流控制电路。
在一实施例中，LED负载3可以是包括一个或多个LED的LED模组。
请参阅图4，图4为本发明的电流纹波消除电路的工作波形。图4的波形分别表示节点B1的电压、节点B2的电流以及功率管M栅极B3的电压。
进一步而言，功率管M工作于饱和区，在功率管M的栅极-源极电压(即VGS)固定时，其漏极电流不会随漏极-源极电压(即VDS)变化。在LED电流纹波消除电路4正常工作时，可分为以下两种情况。
第一种情况，当功率管M漏极-源极电压VDS高于稳压管Z的击穿电压BV Z时，通过第一电阻R1和稳压管Z对第一电容C1充电，充电电流值I 1为
Figure PCTCN2018082431-appb-000001
第二种情况，当功率管M漏极-源极电压VDS低于稳压管Z的击穿电压BV Z时，通过第二电阻R2对第一电容C1放电，放电电流值I 2为
Figure PCTCN2018082431-appb-000002
自适应地将功率管M的栅极-源极电压调整到适当的电压值，通过选择合适的第一电阻R1的阻值、第二电阻R2的阻值和第一电容C1的容值，以满足电流纹波和启动时间的要求。
由于本发明的电流纹波消除电路4采用优化技术，全输出电流范围无失真现象，可真正实现全输出电流范围零电流纹波，特别是在小电流条件下，电流纹波比现有技术显着降低。
综上所述，由于本发明的电流纹波消除电路中的功率管工作于饱和区，由第一电阻、第一电容、稳压管及第二电阻对功率管的栅极电压纹波进行滤波处理以使功率管减小其漏极的电流纹波，因此在小电流条件下，电流纹波比现有技术显着降低。此外，本发明的电流纹波消除电路结构简单、设计灵活，能够显着降低***体积和成本以及极大扩宽应用领域，充分 克服了现有技术中所具有的问题。
藉由以上较佳具体实施例的描述，本领域具有通常知识者当可更加清楚本发明的特征与精神，惟上述实施例仅为说明本发明的原理及其功效，而非用以限制本发明。因此，任何对上述实施例进行的修改及变化仍不脱离本发明的精神，且本发明的权利范围应如权利要求书所列。

Claims (4)

  1. 一种电流纹波消除电路，其特征在于，所述交流充电设备控制导引电路包括：
    功率管；
    第一电阻，所述第一电阻的第一端与所述功率管的漏极连接；
    稳压管，所述稳压管的阴极与所述第一电阻的第二端连接；
    第一电容，所述第一电容的第一端与所述稳压管的阳极以及所述功率管的栅极连接；以及
    第二电阻，所述第二电阻的第一端与所述功率管的栅极连接；
    其中，所述第一电阻的第一端与所述功率管的漏极的共接点为输入端，以及所述功率管的源极、所述第二电阻的第二端与所述第一电容的第二端的共接点为输出端。
  2. 如权利要求1所述的电流纹波消除电路，其特征在于，所述电流纹波消除电路还与一恒流控制电路、一LED负载以及一储能电容连接，其中，所述恒流控制电路的输出端与所述储能电容的第一端连接所述LED负载的输入端，所述电流纹波消除电路的输入端连接所述LED负载的输出端，以及所述电流纹波消除电路的输出端连接所述恒流控制电路的回路端与所述储能电容的第二端。
  3. 如权利要求2所述的电流纹波消除电路，其特征在于，恒流控制电路是具备高功率因数的LED恒流控制电路。
  4. 如权利要求2所述的电流纹波消除电路，其特征在于，所述LED负载是包括一个或多个LED的LED模组。
PCT/CN2018/082431 2017-08-25 2018-04-10 电流纹波消除电路 WO2019037437A1 (zh)

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