CN110190755A - 一种双线圈输出的感应加热电源电路 - Google Patents

一种双线圈输出的感应加热电源电路 Download PDF

Info

Publication number
CN110190755A
CN110190755A CN201910304488.XA CN201910304488A CN110190755A CN 110190755 A CN110190755 A CN 110190755A CN 201910304488 A CN201910304488 A CN 201910304488A CN 110190755 A CN110190755 A CN 110190755A
Authority
CN
China
Prior art keywords
circuit
power supply
induction heating
heating power
supply circuit
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
CN201910304488.XA
Other languages
English (en)
Inventor
丁富拓
朱兴发
李亚逸
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.)
SUZHOU ZHENHU ELECTRIC FURNACE CO Ltd
SUZHOU ZHENWU ELECTRIC FURNACE CO Ltd
Original Assignee
SUZHOU ZHENHU ELECTRIC FURNACE CO Ltd
SUZHOU ZHENWU ELECTRIC FURNACE 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 SUZHOU ZHENHU ELECTRIC FURNACE CO Ltd, SUZHOU ZHENWU ELECTRIC FURNACE CO Ltd filed Critical SUZHOU ZHENHU ELECTRIC FURNACE CO Ltd
Priority to CN201910304488.XA priority Critical patent/CN110190755A/zh
Publication of CN110190755A publication Critical patent/CN110190755A/zh
Pending legal-status Critical Current

Links

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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/493—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • 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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/04—Sources of current
    • 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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/36—Coil arrangements
    • H05B6/44—Coil arrangements having more than one coil or coil segment
    • 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
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • 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
    • H02M1/0083—Converters characterised by their input or output configuration
    • H02M1/009—Converters characterised by their input or output configuration having two or more independently controlled outputs
    • 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)
  • General Induction Heating (AREA)

Abstract

本发明提供了一种双线圈输出的感应加热电源电路，包含整流电路和两个逆变输出单元，两个逆变输出单元并联后连接所述整流电路，所述逆变输出单元包含顺序连接的分流电路、滤波电路、逆变电桥和LLC谐振负载电路，所述LLC谐振负载电路包含第一串联电抗器、谐振电容和谐振工作电感，其中，谐振电容和谐振工作电感相并联形成LC并联谐振电路，所述第一串联电抗器串联所述LC并联谐振电路。本发明提供的双线圈输出的感应加热电源电路，由于采用复合槽路，即LLC谐振电路，实现了双线圈独立工作，能独立调节功率而不相互干扰。

Description

一种双线圈输出的感应加热电源电路
技术领域
本发明涉及感应加热电源电路技术领域，尤其涉及一种双线圈输出的感应加热电源电路。
背景技术
当前工业及商用大功率感应加热电源电路多采用全桥或半桥电路串联或并联谐振电路，其有一共同特点，就是谐振槽路是单槽路，也即单LC谐振回路，在普通的单线圈加热工况下，性能可以做的很好。然而，如果需要双线圈独立控制功率，则其双线圈不能靠得很近，否则双线圈互相干扰，不能正常起振工作。
发明内容
本发明所要解决的技术问题在于针对现有技术的不足，提供一种双线圈输出的感应加热电源电路，解决现有感应加热电源电路中双线圈互相干扰的问题。
本发明所要解决的技术问题是通过如下技术方案实现的：
一种双线圈输出的感应加热电源电路，包含整流电路和两个逆变输出单元，两个逆变输出单元并联后连接所述整流电路，所述逆变输出单元包含顺序连接的分流电路、滤波电路、逆变电桥和LLC谐振负载电路，所述LLC谐振负载电路包含第一串联电抗器、谐振电容和谐振工作电感，其中，谐振电容和谐振工作电感相并联形成LC并联谐振电路，所述第一串联电抗器串联所述LC并联谐振电路。
特别的，所述滤波电路采用L型滤波电路，所述L型滤波电路包含相串联的滤波电容和第二串联电抗器。
特别的，所述逆变电桥采用全桥IGBT逆变电路。
特别的，所述分流电路采用二极管分流电路。
特别的，所述整流电路采用二极管三相桥式整流电路。
特别的，所述整流电路和逆变输出单元之间还设有阻容吸收电路。
特别的，所述阻容吸收电路包含相串联的电阻和电容。
本发明提供的双线圈输出的感应加热电源电路，由于采用复合槽路，即LLC谐振电路，实现了双线圈独立工作，能独立调节功率而不相互干扰。
附图说明
图1为本发明中一种实施例的双线圈输出的感应加热电源电路的结构方框图；
图2为图1中双线圈输出的感应加热电源电路的电路结构示意图。
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详细的描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动的前提下所获得的所有其他实施例，都属于本发明保护的范围。
如图1及图2所示，本实施例的双线圈输出的感应加热电源电路包含整流电路1和两个逆变输出单元2，且两个逆变输出单元2相变联后连接所述整流电路1。每个逆变输出单元2包含顺序链接的分流电路21、滤波电路22、逆变电桥23和LLC谐振负载电路24。
其中，整流电路1、分流电路21、滤波电路22以及逆变电桥23可以采用现有各种电路模块来实现。例如，整流电路1采用二极管三相桥式整流电路，包含6只整流二极管，其中三只二极管组成共阴极的整流电路，另外三只二极管组成共阳极的不控整流电路；分流电路21采用二极管分流电路，包含一只分流二极管；滤波电路22采用L型滤波电路，所述L型滤波电路包含相串联的滤波电容和第二串联电抗器；逆变电桥23采用全桥IGBT逆变电路，由4个可关断功率器件或晶闸管组成。LLC谐振负载电路24包含第一串联电抗器、谐振电容和谐振工作电感，其中，谐振电容和谐振工作电感相并联形成LC并联谐振电路，所述第一串联电抗器串联所述LC并联谐振电路。可选的，整流电路1和逆变输出单元2之间还设有阻容吸收电路3，阻容吸收电路包含6组RC电路，每组RC电路包含相串联的是电阻和电容。
上述的双线圈输出的感应加热电源电路还包含控制电路，控制电路采用锁相环电路，其先采集LLC谐振负载电路中谐振电容上的电流信号，跟踪该电流信号，并在它的过零点上把该电流信号分为相差180度的两路信号，加入死区时间，送到固定桥臂的触发板上。然后从零开始，通过移相集成电路，移动移相臂的触发相位，可以较平滑地控制LLC谐振负载电路的振荡频率，从而控制输出到谐振工作电感的电流，达到平滑控制加热负载功率的目的。
本发明的双线圈输出的感应加热电源电路具有如下特点：
1，采用两个电感线圈，作为逆变输出电路的槽路负载；
2，采用不控整流配合移相，调节电源的输出功率；
3，采用L型滤波，进行平波；
4，采用二极管模块分流，实现一台电源两个输出线圈。
综上，本发明提供的双线圈输出的感应加热电源电路，由于采用复合槽路，即LLC谐振电路，实现了双线圈独立工作，能独立调节功率而不相互干扰。
需要说明的是，在本文中，术语“安装”、“相连”、“连接”、“固定”等术语均应做广义理解，例如，“连接”可以是固定连接，也可以是可拆卸连接，或一体地连接；“相连”可以是直接相连，也可以通过中间媒介间接相连。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。
本发明的描述中，需要理解的是，术语“上”、“下”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或单元必须具有特定的方向、以特定的方位构造和操作，因此，不能理解为对本发明的限制。
诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其它变体意在涵盖非排它性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。
以上所述的具体实施方式，对本发明的目的、技术方案和有益效果进行了进一步详细说明。所应理解的是，以上所述仅为本发明的具体实施方式而已，并不用于限定本发明的保护范围，凡在本发明的精神和原则之内，所做的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (7)

1.一种双线圈输出的感应加热电源电路，其特征在于，包含整流电路和两个逆变输出单元，两个逆变输出单元并联后连接所述整流电路，所述逆变输出单元包含顺序连接的分流电路、滤波电路、逆变电桥和LLC谐振负载电路，所述LLC谐振负载电路包含第一串联电抗器、谐振电容和谐振工作电感，其中，谐振电容和谐振工作电感相并联形成LC并联谐振电路，所述第一串联电抗器串联所述LC并联谐振电路。
2.如权利要求1所述的感应加热电源电路，其特征在于，所述滤波电路采用L型滤波电路，所述L型滤波电路包含相串联的滤波电容和第二串联电抗器。
3.如权利要求1所述的感应加热电源电路，其特征在于，所述逆变电桥采用全桥IGBT逆变电路。
4.如权利要求1所述的感应加热电源电路，其特征在于，所述分流电路采用二极管分流电路。
5.如权利要求1所述的感应加热电源电路，其特征在于，所述整流电路采用二极管三相桥式整流电路。
6.如权利要求1所述的感应加热电源电路，其特征在于，所述整流电路和逆变输出单元之间还设有阻容吸收电路。
7.如权利要求6所述的感应加热电源电路，其特征在于，所述阻容吸收电路包含相串联的电阻和电容。
CN201910304488.XA 2019-04-16 2019-04-16 一种双线圈输出的感应加热电源电路 Pending CN110190755A (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910304488.XA CN110190755A (zh) 2019-04-16 2019-04-16 一种双线圈输出的感应加热电源电路

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910304488.XA CN110190755A (zh) 2019-04-16 2019-04-16 一种双线圈输出的感应加热电源电路

Publications (1)

Publication Number Publication Date
CN110190755A true CN110190755A (zh) 2019-08-30

Family

ID=67714581

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910304488.XA Pending CN110190755A (zh) 2019-04-16 2019-04-16 一种双线圈输出的感应加热电源电路

Country Status (1)

Country Link
CN (1) CN110190755A (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110662319A (zh) * 2019-09-20 2020-01-07 深圳市双平电源技术有限公司 一种多工位感应加热电路及其加热、控制方法
CN112072902A (zh) * 2020-08-28 2020-12-11 宋喂 一种高频感应加热装置

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001298956A (ja) * 2000-04-12 2001-10-26 Fuji Electric Co Ltd 誘導加熱電源
EP1363474A2 (de) * 2002-05-16 2003-11-19 Eldec Schwenk Induction GmbH Einrichtung zum induktiven Erwärmen von Werkstücken
CN101820222A (zh) * 2010-06-18 2010-09-01 陶顺祝 全电压范围llc谐振变换器及控制方法
CN101997421A (zh) * 2009-08-14 2011-03-30 台达电子工业股份有限公司 具过流保护装置的谐振变换器及其控制方法
CN104362629A (zh) * 2014-10-27 2015-02-18 国家电网公司 一种谐波电能再生利用装置
CN205883057U (zh) * 2016-07-05 2017-01-11 昆明理工大学 一种基于lcc谐振网络的微波应用器驱动电源
CN108418433A (zh) * 2018-03-29 2018-08-17 深圳驿普乐氏科技有限公司 一种llc谐振变换器及其控制电路、谐振电流采样电路
CN108964469A (zh) * 2018-07-16 2018-12-07 江南大学 一种并串联结构的全桥双llc谐振变换器
CN209562414U (zh) * 2019-04-16 2019-10-29 苏州振吴电炉有限公司 一种双线圈输出的感应加热电源电路

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001298956A (ja) * 2000-04-12 2001-10-26 Fuji Electric Co Ltd 誘導加熱電源
EP1363474A2 (de) * 2002-05-16 2003-11-19 Eldec Schwenk Induction GmbH Einrichtung zum induktiven Erwärmen von Werkstücken
CN101997421A (zh) * 2009-08-14 2011-03-30 台达电子工业股份有限公司 具过流保护装置的谐振变换器及其控制方法
CN101820222A (zh) * 2010-06-18 2010-09-01 陶顺祝 全电压范围llc谐振变换器及控制方法
CN104362629A (zh) * 2014-10-27 2015-02-18 国家电网公司 一种谐波电能再生利用装置
CN205883057U (zh) * 2016-07-05 2017-01-11 昆明理工大学 一种基于lcc谐振网络的微波应用器驱动电源
CN108418433A (zh) * 2018-03-29 2018-08-17 深圳驿普乐氏科技有限公司 一种llc谐振变换器及其控制电路、谐振电流采样电路
CN108964469A (zh) * 2018-07-16 2018-12-07 江南大学 一种并串联结构的全桥双llc谐振变换器
CN209562414U (zh) * 2019-04-16 2019-10-29 苏州振吴电炉有限公司 一种双线圈输出的感应加热电源电路

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110662319A (zh) * 2019-09-20 2020-01-07 深圳市双平电源技术有限公司 一种多工位感应加热电路及其加热、控制方法
CN112072902A (zh) * 2020-08-28 2020-12-11 宋喂 一种高频感应加热装置

Similar Documents

Publication Publication Date Title
EP3561997B1 (en) Wireless power transfer system
CN1242539C (zh) Llc串联共振dc/dc变换器
CN109245536A (zh) 一种适用于双向近场电能传输的电路拓扑结构
TWI458146B (zh) Piezoelectric drive circuit with zero voltage switching
CN106787675B (zh) 具有功率因数校正功能的谐振变换器及其控制器
US8737104B2 (en) Switching power supply device
CN102882286A (zh) 一种基于电场耦合的无线电能传输系统
CN102047549B (zh) 扫描频率llc谐振功率调节器
CN202178712U (zh) 双同步谐振切换式直流电源供应器
EP3337024A1 (en) Bidirectional resonant conversion circuit and converter
CN208955902U (zh) 一种适用于双向近场电能传输的电路拓扑结构
US20060273737A1 (en) Electronic ballast for at least one lamp
CN110190755A (zh) 一种双线圈输出的感应加热电源电路
CN114825656B (zh) 一种无线电能与数据同步传输系统及数据调制方法
CN112260549B (zh) 减小谐振式无线电能传输系统原边侧逆变器损耗的方法
CN103547051A (zh) 一种无极灯用谐振变换器谐振参数设计方法
CN209562414U (zh) 一种双线圈输出的感应加热电源电路
US20170040844A1 (en) Efficient power transmitting terminal, contactless power transmission device and power transmission method
CN115118174A (zh) 一种非对称半桥反激变换器和电源系统
CN115765516B (zh) 双向储能变换器和双向电源
CN208001236U (zh) 一种高压双向直流变换电路
CN208128126U (zh) 基于双变压器多电平的高压高频dbd电驱动器
CN206775388U (zh) 一种隔离数字微型电源
CN108011538B (zh) 小功率高频双向ac-dc单管变换器及无线充电方法
CN217883233U (zh) 一种基于无线电能传输的三相变频电路

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