CN113179027A - 一种配备llc电路的emc优化方法 - Google Patents

一种配备llc电路的emc优化方法 Download PDF

Info

Publication number
CN113179027A
CN113179027A CN202110562333.3A CN202110562333A CN113179027A CN 113179027 A CN113179027 A CN 113179027A CN 202110562333 A CN202110562333 A CN 202110562333A CN 113179027 A CN113179027 A CN 113179027A
Authority
CN
China
Prior art keywords
frequency
llc
emc
llc circuit
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110562333.3A
Other languages
English (en)
Inventor
刘明
王津宇
刘亚峰
鞠文博
董辉
张晓锋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sicon Chat Union Electric Co ltd
Original Assignee
Sicon Chat Union Electric Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sicon Chat Union Electric Co ltd filed Critical Sicon Chat Union Electric Co ltd
Priority to CN202110562333.3A priority Critical patent/CN113179027A/zh
Publication of CN113179027A publication Critical patent/CN113179027A/zh
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from dc input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Dc-Dc Converters (AREA)

Abstract

本发明公开了一种配备LLC电路的EMC优化方法，通过采集母线电压、纹波及DC输出电压，在LLC的内环中加入使频率可以周期波动的一种控制函数，我们使他以交流频率整数倍的速度进行有规律有周期性的波动，从而实现抖频控制方式，LLC电压环路控制图里是在常规LLC电压控制器的基础上增加了V_Bus控制环节以实现我们的目的，先采集V_Bus信号，对其作傅里叶分析，得出相应纹波的幅值和角度，再经过H(z)处理。该配备LLC电路的EMC优化方法以LLC电源抑制EMC杂散超标的抖频控制方式，其具有性能稳定，输出纹波降低，可实现由单一频点的能量到区间频点的分散分布，提高EMC性能，效果明显和成本低廉等优势。

Description

一种配备LLC电路的EMC优化方法
技术领域
本发明涉及充电设备技术领域，具体涉及一种配备LLC电路的EMC优化方法。
背景技术
随着5G应用和新能源汽车的发展，充电模块，大功率直流电源等电源的功率增大，功率密度提升的同时，给产品的EMC设计空间带来极大的挑战，现业内一般使用下面框图形式实现电路变换，交流电经过PFC电路(有功率因数校正功能的整流电路)，输出直流高压母线Vbus，Vbus经过LLC(中文名：谐振变换器)输出直流电，为负载供电，或电池充电。LLC虽然是使用软开关技术，但其EMC性能还是需要有较大复杂的滤波器实现设计要求，而且还会带来整机的重量极高、增加PCB的布线空间等不足之处。保护于充电桩模块、车载充电机、高压直流产品。
发明内容
本发明目的：鉴于上述背景技术的需求，我们提供一种配备LLC电路的EMC优化方法，以LLC电源抑制EMC杂散超标的抖频控制方式，其具有性能稳定，输出纹波降低，可实现由单一频点的能量到区间频点的分散分布，提高EMC性能，效果明显和成本低廉等优势。
为了达到上述目的，本发明采取以下技术方案：
一种配备LLC电路的EMC优化方法，通过采集母线电压、纹波及DC输出电压，在LLC的内环中加入使频率可以周期波动的一种控制函数，使其以交流频率整数倍的速度进行有规律有周期性的波动，从而实现抖频控制方式，LLC电压环路控制图里是在常规LLC电压控制器的基础上增加了V_Bus控制环节以实现我们的目的，先采集V_Bus信号，对其作傅里叶分析，得出相应纹波的幅值和角度，再经过H(z)处理。整个环节并联到LLC的电压环控制器上，G控制器的控制函数如下：
G(s)＝Kp+(2*Kr*Wc*s)/(s^2+2*Wc*s+w)
其中：Kp为控制函数的直流增益，W为FFT解析后的频率值，Wc为频率带宽值，Kr为对应FFT解析后的频率(W)的增益。
从控制函数中可以看到，谐振的频率、带宽、增益都可以设置，抑制输入交流对应倍频，母线电压纹波频率。
本发明的有益效果是：
该配备LLC电路的EMC优化方法以LLC电源抑制EMC杂散超标的抖频控制方式，其具有性能稳定，输出纹波降低，可实现由单一频点的能量到区间频点的分散分布，提高EMC性能，效果明显和成本低廉等优势。
附图说明
图1为现有PFC整流电路的原理图；
图2为LLCdc/dc电路框图的侧仰视图；
图3为本实施例配备LLC电路的EMC优化方法的原理图；
图4为本实施例LLC电压环路控制图；
图5为本实施例抖频控制电路原理图；
图6为本实施例有无抖频控制的曲线图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述。
请参阅图1-6，本实施例一种配备LLC电路的EMC优化方法，通过采集母线电压、纹波及DC输出电压，在LLC的内环中加入使频率可以周期波动的一种控制函数，使其以交流频率整数倍的速度进行有规律有周期性的波动，从而实现抖频控制方式。
如图3、4和5，LLC电压环路控制图里是在常规LLC电压控制器的基础上增加了V_Bus控制环节以实现我们的目的，先采集V_Bus信号，对其作傅里叶分析，得出相应纹波的幅值和角度，再经过H(z)处理。整个环节并联到LLC的电压环控制器上，G控制器的控制函数如下：
G(s)＝Kp+(2*Kr*Wc*s)/(s^2+2*Wc*s+w)
其中：Kp为控制函数的直流增益，W为FFT解析后的频率值，Wc为频率带宽值，Kr为对应FFT解析后的频率(W)的增益。
从控制函数中可以看到，谐振的频率、带宽、增益都可以设置，抑制输入交流对应倍频，母线电压纹波频率。
本发明可以实现由单一频点的能量到区间频点的分散分布，由图6知整体的最大分量被基本平均了下来，由于后级的LLC拓扑具有很高工作频率，但低频的谐波成分很大，所以输出需要很大的电感进行滤波，但是实际滤波器是针对LLC工作频率设计的，电感一般较小，无法实现理想的滤波效果，因而迫切的需要一种频率抖动技术，给较大的一次成分的谐波进行分散，如图6所示，横坐标表示频率，纵坐标表示EMI的杂音的大小。图6是加入抖频控制的传导测试中输出应被调整频率的分布，可以看出尖峰明显的降低。
上面结合附图对本发明的实施方式作了详细说明，但是本发明并不限于上述实施方式，在本领域普通技术人员所具备的知识范围内，还可以在不脱离本发明宗旨的前提下做出各种变化、修改、替换和变型，本发明的范围由所附权利要求及其等同物限定。

Claims (2)

1.一种配备LLC电路的EMC优化方法，其特征在于：通过采集母线电压、纹波及DC输出电压，在LLC的内环中加入使频率可以周期波动的一种控制函数，使其以交流频率整数倍的速度进行有规律、周期性的波动，从而实现抖频控制方式，LLC电压环路控制图里是在常规LLC电压控制器的基础上增加了V_Bus控制环节以实现我们的目的，先采集V_Bus信号，对其作傅里叶分析，得出相应纹波的幅值和角度，再经过H(z)处理，整个环节并联到LLC的电压环控制器上，G控制器的控制函数如下：
G(s)＝Kp+(2*Kr*Wc*s)/(s^2+2*Wc*s+w)；
其中：Kp为控制函数的直流增益，W为FFT解析后的频率值，Wc为频率带宽值，Kr为对应FFT解析后的频率W的增益。
2.根据权利要求1所述的配备LLC电路的EMC优化方法，其特征在于：谐振的频率、带宽、增益都可以设置，抑制输入交流对应倍频，母线电压纹波频率。
CN202110562333.3A 2021-05-24 2021-05-24 一种配备llc电路的emc优化方法 Pending CN113179027A (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110562333.3A CN113179027A (zh) 2021-05-24 2021-05-24 一种配备llc电路的emc优化方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110562333.3A CN113179027A (zh) 2021-05-24 2021-05-24 一种配备llc电路的emc优化方法

Publications (1)

Publication Number Publication Date
CN113179027A true CN113179027A (zh) 2021-07-27

Family

ID=76929749

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110562333.3A Pending CN113179027A (zh) 2021-05-24 2021-05-24 一种配备llc电路的emc优化方法

Country Status (1)

Country Link
CN (1) CN113179027A (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113991990A (zh) * 2021-12-28 2022-01-28 深圳市永联科技股份有限公司 一种开关电源的调节方法及装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101730337A (zh) * 2008-10-28 2010-06-09 重庆卓为电子技术有限公司 Led驱动电路中有效降低电磁干扰的抖频技术
US20140085936A1 (en) * 2012-09-25 2014-03-27 Delta Electronics (Shanghai) Co., Ltd. Variable frequency converter and adjusting method for the same
CN104124869A (zh) * 2013-04-28 2014-10-29 艾默生网络能源系统北美公司 一种升压电路及其信号输出方法
CN110971118A (zh) * 2019-12-16 2020-04-07 深圳天邦达科技有限公司 抖频控制方法、装置以及电路
CN111478579A (zh) * 2020-05-20 2020-07-31 深圳威迈斯新能源股份有限公司 Emc滤波控制电路及方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101730337A (zh) * 2008-10-28 2010-06-09 重庆卓为电子技术有限公司 Led驱动电路中有效降低电磁干扰的抖频技术
US20140085936A1 (en) * 2012-09-25 2014-03-27 Delta Electronics (Shanghai) Co., Ltd. Variable frequency converter and adjusting method for the same
CN104124869A (zh) * 2013-04-28 2014-10-29 艾默生网络能源系统北美公司 一种升压电路及其信号输出方法
CN110971118A (zh) * 2019-12-16 2020-04-07 深圳天邦达科技有限公司 抖频控制方法、装置以及电路
CN111478579A (zh) * 2020-05-20 2020-07-31 深圳威迈斯新能源股份有限公司 Emc滤波控制电路及方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
GANG YANG,等: ""Double-Phase High-Efficiency,Wide Load Range High-Voltage/Low-Voltage LLC DC/DC Converter for Electric/Hybrid Vehicles"", 《IEEE TRANSACTIONS ON POWER ELECTRONICS》 *
叶益迭，何乐年: ""高可靠、高效率的白光LED高压驱动芯片"", 《电路与系统学报》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113991990A (zh) * 2021-12-28 2022-01-28 深圳市永联科技股份有限公司 一种开关电源的调节方法及装置
CN113991990B (zh) * 2021-12-28 2022-03-08 深圳市永联科技股份有限公司 一种开关电源的调节方法及装置

Similar Documents

Publication Publication Date Title
US5631550A (en) Digital control for active power factor correction
CN108900093B (zh) 单相pfc电路工频纹波消除方法及pfc拓扑系统、充电桩系统
CN108347173A (zh) 准谐振反激式开关电源系统
CN102508183B (zh) 一种负载自适应控制的数字可变频pwm梯度放大器
CN109149976A (zh) 用于控制llc转换器的装置
CN113179027A (zh) 一种配备llc电路的emc优化方法
CN110995042B (zh) 飞跨电容三电平逆变器的变开关频率pwm控制方法和系统
Zhang et al. Active EMI reduction technique of active front end (AFE) drives based on randomized switching frequency PWM
WO2024083122A1 (zh) 一种高速电机载频调制方法和系统
CN102025146B (zh) 一种双开关直流有源电力滤波器及其控制方法
CN113036767A (zh) 一种自适应频率耦合振荡抑制装置的控制方法
Rahimi et al. EMI consideration of high reliability DC-DC converter: In aerospace based electric transport system charger application
Trzynadlowski Active attenuation of electromagnetic noise in an inverter-fed automotive electric drive system
CN202261011U (zh) 一种半桥结构下的自然抖频电路
CN114884046A (zh) 一种基于阻抗编辑的多低次谐波电流自适应抑制方法
CN1240177C (zh) 有直流源的支路阻抗解耦控制的有源电力滤波方法及系统
Matalata et al. New topology multilevel inverter type diode clamped five level single phase
Kim et al. Combined dithered sigma-delta modulation based random PWM switching scheme
CN107659131B (zh) 一种降低电源纹波的电路及方法
Li et al. A chaotic soft switching PWM boost converter for EMI reduction
CN105634006A (zh) 一种并网逆变器控制方法及系统
JP2021083241A (ja) 電力変換装置
Li et al. Common-mode EMI suppression based on chaotic SPWM for a single-phase transformerless photovoltaic inverter
Wu A modified grid voltage feedforward method to improve the stability-robustness of the grid-connected voltage source converter under weak grid conditions
Siu et al. Design, implementation and analysis of an advanced digital controller for active virtual ground-bridgeless PFC

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination