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1. WO2020220558 - DIGITAL CONTROL METHOD FOR ACHIEVING MULTI-STEP FREQUENCY MODULATION OF LLC RESONANT CONVERTER

Publication Number WO/2020/220558
Publication Date 05.11.2020
International Application No. PCT/CN2019/105483
International Filing Date 11.09.2019
IPC
H02M 3/335 2006.01
HELECTRICITY
02GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
MAPPARATUS 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
3Conversion of dc power input into dc power output
22with intermediate conversion into ac
24by static converters
28using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
325using devices of a triode or a transistor type requiring continuous application of a control signal
335using semiconductor devices only
CPC
H02M 2001/0012
HELECTRICITY
02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
MAPPARATUS 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
1Details of apparatus for conversion
0003Details of control, feedback and regulation circuits
0012Control circuits using digital or numerical techniques
H02M 3/33592
HELECTRICITY
02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
MAPPARATUS 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
3Conversion of dc power input into dc power output
22with intermediate conversion into ac
24by static converters
28using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
325using devices of a triode or a transistor type requiring continuous application of a control signal
335using semiconductor devices only
33569having several active switching elements
33576having at least one active switching element at the secondary side of an isolation transformer
33592having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
Y02B 70/10
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
70Technologies for an efficient end-user side electric power management and consumption
10Technologies 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
Applicants
  • 东南大学 SOUTHEAST UNIVERSITY [CN]/[CN]
Inventors
  • 钱钦松 QIAN, Qinsong
  • 秦阳 QIN, Yang
  • 胡瑞成 HU, Ruicheng
  • 孙伟锋 SUN, Weifeng
  • 陆生礼 LU, Shengli
  • 时龙兴 SHI, Longxing
Agents
  • 南京瑞弘专利商标事务所(普通合伙) NANJING RUIHONG PATENT & TRADEMARK AGENCY (ORDINARY PARTNERSHIP)
Priority Data
201910359716.330.04.2019CN
Publication Language Chinese (ZH)
Filing Language Chinese (ZH)
Designated States
Title
(EN) DIGITAL CONTROL METHOD FOR ACHIEVING MULTI-STEP FREQUENCY MODULATION OF LLC RESONANT CONVERTER
(FR) PROCÉDÉ DE COMMANDE NUMÉRIQUE POUR RÉALISER UNE MODULATION DE FRÉQUENCE À PAS MULTIPLES D'UN CONVERTISSEUR RÉSONNANT LLC
(ZH) 实现LLC谐振变换器多步调频的数字控制方法
Abstract
(EN)
The present invention relates to the technical field of power generation, power transformation or power distribution, and provides a digital control method for achieving multi-step frequency modulation of an LLC resonant converter. The method is achieved by means of a system comprising a voltage sampling circuit (1), a control circuit (2) using a microcontroller as the core, and an isolation drive circuit (3). The method comprises: sampling an output voltage (Vout) value in each period; when an output voltage fluctuates caused by a change of an input voltage (VIN) or an output load, collecting a voltage value on a voltage dividing resistor by means of the voltage sampling circuit (1); by means of the control circuit (2) using the microcontroller as the core, comparing the output voltage sampling value with a set value, and then, calculating a frequency corresponding to a maximum gain or minimum gain value point and switching to the frequency point; and after eliminating output voltage (Vout) fluctuation caused by the change of the input voltage (VIN) or the output load, enabling the LLC converter to operate at the required switching frequency and performing PI regulation on the output voltage (Vout) according to the difference value between the output voltage and the set value so as to finally enable the output voltage (Vout) to be stable, thereby improving a dynamic response speed.
(FR)
La présente invention concerne le domaine technique de la production d'énergie, de la transformation de l'énergie ou de la distribution d'énergie, et porte sur un procédé de commande numérique pour réaliser une modulation de fréquence à pas multiples d'un convertisseur résonant LLC. Le procédé est mis en œuvre au moyen d'un système comprenant un circuit d'échantillonnage de tension (1), un circuit de commande (2) utilisant un microcontrôleur comme cœur, et un circuit d'attaque à isolation (3). Le procédé consiste à : échantillonner une valeur de tension de sortie (Vout) dans chaque période ; lorsqu'une tension de sortie fluctue en raison d'une variation d'une tension d'entrée (VIN) ou une charge de sortie, collecter une valeur de tension sur une résistance de division de tension au moyen du circuit d'échantillonnage de tension (1) ; au moyen du circuit de commande (2) utilisant le microcontrôleur comme cœur, comparer la valeur d'échantillonnage de tension de sortie à une valeur de consigne, puis calculer une fréquence correspondant à un point de valeur de gain maximum ou de gain minimum et commuter vers le point de fréquence ; et après élimination de la fluctuation de la tension de sortie (Vout) provoquée par la variation de la tension d'entrée (VIN) ou de la charge de sortie, permettre au convertisseur LLC de fonctionner à la fréquence de commutation requise et effectuer une régulation PI sur la tension de sortie (Vout) en fonction de la valeur de différence entre la tension de sortie et la valeur de consigne de façon à permettre finalement à la tension de sortie (Vout) d'être stable, améliorant ainsi une vitesse de réponse dynamique.
(ZH)
一种实现LLC谐振变换器多步调频的数字控制方法,属于发电、变电或配电的技术领域。该方法通过包括电压采样电路(1)、以微控制器为核心的控制电路(2)、隔离驱动电路(3)的系统实现,在每个周期内采样输出电压(Vout)值,当输入电压(VIN)或输出负载变化引起输出电压波动时,通过电压采样电路(1)采集分压电阻上的电压值,由以微控制器为核心的控制电路(2)比较输出电压采样值与设定值后计算得到最大增益或最小增益值点对应的频率并切换至该频率点,在消除输入电压(VIN)或输出负载变化引起的输出电压(Vout)波动后,使LLC变换器工作在要求的开关频率处并依据输出电压(Vout)偏离设定值的差值对输出电压(Vout)进行PI调节,最终使输出电压(Vout)稳定,提高了动态响应速度。
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