CN107517011A - 一种多频输出的“一拖二”串联谐振中频感应加热电源 - Google Patents

一种多频输出的“一拖二”串联谐振中频感应加热电源 Download PDF

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CN107517011A
CN107517011A CN201710762374.0A CN201710762374A CN107517011A CN 107517011 A CN107517011 A CN 107517011A CN 201710762374 A CN201710762374 A CN 201710762374A CN 107517011 A CN107517011 A CN 107517011A
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power supply
unit
drag
resonant
induction heating
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姚自立
郭智文
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Nanjing Sky Electrical Engineering Technology Co Ltd Of Middle Smelting China
Huatian Engineering and Technology Corp MCC
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    • 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
    • H02M5/4585—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 having a rectifier with controlled elements
    • 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
    • H02M5/443—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 thyratron or thyristor type requiring extinguishing means
    • H02M5/45—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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M5/4505—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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only having a rectifier with controlled elements
    • 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
    • H02M5/443—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 thyratron or thyristor type requiring extinguishing means
    • H02M5/45—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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M5/451—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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only with automatic control of output voltage or frequency
    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0012—Control circuits using digital or numerical techniques
    • 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
    • H02M1/0074—Plural converter units whose inputs are connected in series
    • 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

Abstract

一种多频输出的“一拖二”串联谐振中频感应加热电源，包括整流单元1、滤波单元2、逆变单元3、谐振单元4和控制单元5，整流单元1采用12脉波全控桥整流电路；滤波单元采用LC滤波电路；逆变单元采用两个相互独立的半桥逆变电路或全桥逆变电路，两个相互独立的逆变电路并联后连接在滤波单元上，产生两个独立的电源，构成“一拖二”电源；谐振单元采用两个相互独立的LC串联谐振电路，通过开关的导通和关断改变谐振单元的电容大小，实现电源的多频率输出；控制单元采用以DSP芯片为主的控制器，控制单元分别控制整流单元、逆变单元和谐振单元；本发明的功率分配方便，具有很高的功率因数，电源效率高。

Description

一种多频输出的“一拖二”串联谐振中频感应加热电源
技术领域
本发明涉及冶金工业中的加热炉电源，属于电力电子的技术领域，具体说是一种多频输出的“一拖二”串联谐振中频感应加热电源。
背景技术
目前的感应加热电源基本都采用一台整流器搭配一台逆变器向一台电炉供电的方式，被人们称为“一拖一”式感应加热技术。这种加热技术不能更好的降低能耗，浪费了电源的利用效率
发明内容
本发明的目的就是要解决以上问题，提供一种多频输出的“一拖二”串联谐振中频感应加热电源，实现了“一拖二”电源负载的自动匹配控制，以达到提高电源效率，降低能耗的目的。
本发明提供一种多频输出的“一拖二”串联谐振中频感应加热电源，该电源中的两组逆变电路相互独立，构成“一拖二”电源，电源的负载功率可自动匹配，通过控制谐振单元中的谐振电容大小，可实现电源的多频率输出。
为了达到上述目的，本发明采用如下技术方案：
一种多频输出的“一拖二”串联谐振中频感应加热电源，其特点是：主要包括整流单元、滤波单元、逆变单元、谐振单元和控制单元；整流单元采用12脉波全控桥整流电路；滤波单元采用LC滤波电路；逆变单元采用两个相互独立的半桥逆变电路或全桥逆变电路，两个相互独立的逆变电路并联后连接在滤波单元上，产生两个独立的电源，构成“一拖二”电源；谐振单元采用两个相互独立的LC串联谐振电路，通过开关的导通和关断改变谐振单元的电容大小，实现电源的多频率输出；控制单元采用以DSP芯片为主的控制器，控制单元分别控制整流单元、逆变单元和谐振单元。
进一步的，所述的整流单元采用12脉波全控桥整流电路，串联谐振中频感应加热电源刚开始启动时，调节12脉波全控桥晶闸管的触发角，触发角由大逐渐减小，使滤波电容缓慢充电，当滤波电容充电接近额定值时，触发角调到最小值，晶闸管维持最小触发角运行，12脉波全控桥整流可降低系统的谐波污染。
进一步的，所述的逆变单元采用两个相互独立的半桥逆变电路或全桥逆变电路，两个相互独立的逆变电路并联后连接在滤波单元上，两个独立的逆变电路产生两个独立的电源，构成“一拖二”电源。
进一步的，所述的谐振单元采用两个相互独立的LC串联谐振电路，串联谐振电路中的一部分谐振电容与开关串联，再与串联谐振电路中的另一部分谐振电容相并联，最后与谐振电感串联构成LC串联谐振电路。控制单元通过控制开关的导通和关断改变谐振单元的电容大小，实现电源的多频率输出。
进一步的，所述的控制单元采用以DSP芯片为主的控制器，控制单元分别控制整流单元、逆变单元和谐振单元；控制单元控制整流单元的晶闸管触发角，电源启动时缓慢充电滤波单元中的滤波电容，电源运行时控制晶闸管维持最小触发角导通；控制单元通过PWM脉冲控制逆变单元中的功率器件，实现串联谐振中频感应加热电源的扫频调功控制；控制单元通过控制谐振单元的开关导通和关断，实现串联谐振中频感应加热电源的多频率输出。
进一步的，所述的控制单元实现滤波电容的充电控制、他激转自激的启动控制、功率调节的扫频调功控制和“一拖二”电源负载功率的自动匹配控制等功能。
本发明的有益效果在于：“一拖二”串联谐振加热技术是相对于“一拖一”感应加热工艺的一次里程碑式的飞跃。相对于“一拖一”传统设备可以平均少用二分之一的电能，既能保持连续生产，又能明显节约能源。全面提升了电源的利用效率，并且具有结构简单，启动容易、维护方便等优点，具有极为广泛的使用前景。通过控制可改变“一拖二”串联谐振中频感应加热电源的谐振电容大小，实现“一拖二”串联谐振中频感应加热电源的多频率输出，增加“一拖二”串联谐振中频感应加热电源的功能。该电源的功率可自动匹配，能输出多种频率，具有很高的功率因数，电源效率高。
附图说明
图1是多频输出的“一拖二”串联谐振中频感应加热电源的半桥逆变主电路结构图。
图2是多频输出的“一拖二”串联谐振中频感应加热电源的全桥逆变主电路结构图。
图3是多频输出的“一拖二”串联谐振中频感应加热电源的控制单元框图。
图4-1是一路多频输出的“一拖二”串联谐振中频感应加热电源的闭环控制原理框图。
图4-2是另一路多频输出的“一拖二”串联谐振中频感应加热电源的闭环控制原理框图。
图5是本发明的结构方框图。
图中：1、整流单元；2、滤波单元；3、逆变单元；4、谐振单元；5、控制单元。
具体实施方式
下面结合说明书附图对本发明做进一步的描述。
图5是本发明的结构方框图。本发明的电源主要包括整流单元(1)、滤波单元(2)、逆变单元(3)、谐振单元(4)和控制单元(5)。
多频输出的“一拖二”串联谐振中频感应加热电源的半桥逆变主电路结构图，参见图1，其整流单元1由两个三相六脉波全控桥整流电路组成，两个整流电路串联连接，两个整流电路的两组三相交流电源间相位岔开30°，以保证输出的整流直流电压在每一个交流电源周期内都能够连续不间断的脉动12次，构成12脉波整流电路。其中一个三相六脉波全控桥整流电路是由六个晶闸管T1、T2、T3、T4、T5和T6组成，另一个三相六脉波全控桥整流电路是由六个晶闸管T7、T8、T9、T10、T11和T12组成。滤波单元2由一个滤波电感L1和一个滤波电容C1组成，逆变单元3由两个相互独立的半桥逆变电路构成，两个半桥逆变电路为并联连接。逆变单元3其中一个半桥逆变电路由可关断功率器件或晶闸管S1和S2组成，另一个半桥逆变电路由可关断功率器件或晶闸管S1’和S2’组成。谐振单元4由两个相互独立的LC串联谐振电路构成，其中一个LC串联谐振电路由四个谐振电容C2、C3、C4和C5、开关K1和开关K2和谐振电感L2构成。谐振电容C3与开关K1串联后再与谐振电容C2并联，谐振电容C5与开关K2串联后再与谐振电容C4并联，最后与谐振电感L2连接。控制单元5控制开关K1和开关K2的接通和关断，调节谐振电容的大小，改变LC串联谐振电路的谐振频率。另一个LC串联谐振电路由四个谐振电容C2’、C3’、C4’和C5’、开关K1’和开关K2’和谐振电感L2’构成。谐振电容C3’与开关K1’串联后再与谐振电容C2’并联，谐振电容C5’与开关K2’串联后再与谐振电容C4’并联，最后与谐振电感L2’连接。控制单元5控制开关K1’和开关K2’的接通和关断，调节谐振电容的大小，改变LC串联谐振电路的谐振频率，可实现电源的双频率输出。
多频输出的“一拖二”串联谐振中频感应加热电源的全桥逆变主电路结构图，参见图2，其整流单元1由两个三相六脉波全控桥整流电路组成，两个整流电路串联连接，两个整流电路的两组三相交流电源间相位岔开30°，以保证输出的整流直流电压在每一个交流电源周期内都能够连续不间断的脉动12次，构成12脉波整流电路。其中一个三相六脉波全控桥整流电路是由六个晶闸管T1、T2、T3、T4、T5和T6组成，另一个三相六脉波全控桥整流电路是由六个晶闸管T7、T8、T9、T10、T11和T12组成。滤波单元2由一个滤波电感L1和一个滤波电容C1组成，逆变单元3由两个相互独立的全桥逆变电路构成，两个全桥逆变电路为并联连接。逆变单元3其中一个全桥逆变电路由可关断功率器件或晶闸管S1、S2、S3和S4组成，另一个全桥逆变电路由可关断功率器件或晶闸管S1’S2’、S3’和S4’组成。谐振单元4由两个相互独立的LC串联谐振电路构成，其中一个LC串联谐振电路由谐振电容C2和C3、开关K1和谐振电感L2构成。谐振电容C3与开关K1串联后再与谐振电容C2并联，最后与谐振电感L2连接。控制单元5控制开关K1的接通和关断，调节谐振电容的大小，改变LC串联谐振电路的谐振频率。另一个LC串联谐振电路由谐振电容C2’和C3’、开关K1’和谐振电感L2’构成。谐振电容C3’与开关K1’串联后再与谐振电容C2’并联，最后与谐振电感L2’连接。控制单元5控制开关K1’的接通和关断，调节谐振电容的大小，改变LC串联谐振电路的谐振频率，可实现电源的多频率输出。
多频输出的“一拖二”串联谐振中频感应加热电源的控制单元框图，参见图3，串联谐振感应加热电源由TMS320F2812作为控制核心，可实现整流支撑电容充电控制、频率跟踪、功率闭环调节、PWM脉冲发生、故障显示与保护。整个控制系统由DSP控制器及其外围检测采样电路构成。外围电路有：输入电压通过电压互感器检测出来并分为两路，一路通过信号调理电路接DSP控制器的A/D接口用于过压和欠压的保护；另一路接过零点检测电路作为整流晶闸管触发脉冲的同步。输入电流通过电流互感器检测出来，经过信号调理电路接DSP控制器的A/D接口用于过流的保护；输出电流通过电流互感器检测出来并分为两路，一路通过信号调理电路接DSP控制器的A/D接口为功率闭环调节提供反馈电流,进行功率计算；另一路接过零点检测电路作为频率跟踪的同步。输出电压通过电压互感器检测出来并分为两路，一路通过信号调理电路接DS控制器P的A/D接口为功率闭环调节提供反馈电压,进行功率计算；另一路接过零点检测电路用于进行功率因数计算。直流电压通过霍尔传感器检测出来，通过信号调理电路接DSP控制器的A/D接口，直流电流通过霍尔传感器检测出来，通过信号调理电路接DSP控制器的A/D接口。软件部分主要实现支撑电容的充电控制、他激转自激启动、数字锁相环、功率闭环调节、逆变脉冲发生、显示工作状态、与上位机通信等功能、输出过压过流与水温水压故障等的保护。DSP控制器还提供了输入过欠压保护,过热保护,过流保护,开路保护,锁相失败保护和水温水压故障等的保护。
多频输出的“一拖二”串联谐振中频感应加热电源的闭环控制原理框图，参见图4-1和图4-2，多频输出的“一拖二”串联谐振加热电源功率控制调节的实现过程为：共分为两路，第一路，参见图4-1，将电压Uo和检测到的电流Io相乘，得到电源的实际输出功率，再与上位机给定的调节功率进行比较，得到调节的功率差值送入PI1调节器，经过整定后得到需要进一步调整的电流I，将调整后的电流值与在逆变主电路中所测得的实际电流值Io进行比较得到的电流差值送到PI2调节器，经调节后，获得第一路逆变器功率器件的触发脉冲信号。第二路，参见图4-2，将电压Uo’和检测到的电流Io’相乘，得到电源的实际输出功率，再与电源总额定功率减去第一路上位机给定调节功率的值进行比较，得到调节的功率差值送入PI1’调节器，经过整定后得到需要进一步调整的电流I，将调整后的电流值与在逆变主电路中所测得的实际电流值Io’进行比较得到的电流差值送到PI2’调节器，经调节后，获得第二路逆变器功率器件的触发脉冲信号。
以上，仅为本发明的较佳实施例，但本发明的保护范围并不局限与此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应该以权利要求所界定的保护范围为准。

Claims (6)

1.一种多频输出的“一拖二”串联谐振中频感应加热电源，其特征在于：主要包括整流单元(1)、滤波单元(2)、逆变单元(3)、谐振单元(4)和控制单元(5)；整流单元(1)采用12脉波全控桥整流电路；滤波单元(2)采用LC滤波电路；逆变单元(3)采用两个相互独立的半桥逆变电路或全桥逆变电路，两个相互独立的逆变电路并联后连接在滤波单元(2)上，产生两个独立的电源，构成“一拖二”电源；谐振单元(4)采用两个相互独立的LC串联谐振电路，通过开关的导通和关断改变谐振单元(4)的电容大小，实现电源的多频率输出；控制单元(5)采用以DSP芯片为主的控制器，控制单元(5)分别控制整流单元(1)、逆变单元(3)和谐振单元(4)。
2.根据权利要求1所述的一种多频输出的“一拖二”串联谐振中频感应加热电源，其特征在于：所述的整流单元(1)采用12脉波全控桥整流电路，串联谐振中频感应加热电源刚开始启动时，调节12脉波全控桥晶闸管的触发角，触发角由大逐渐减小，使滤波电容缓慢充电，当滤波电容充电接近额定值时，触发角调到最小值，晶闸管维持最小触发角运行，12脉波全控桥整流可降低系统的谐波污染。
3.根据权利要求1所述的一种多频输出的“一拖二”串联谐振中频感应加热电源，其特征在于：所述的逆变单元(3)采用两个相互独立的半桥逆变电路或全桥逆变电路，两个相互独立的逆变电路并联后连接在滤波单元(2)上，两个独立的逆变电路产生两个独立的电源，构成“一拖二”电源。
4.根据权利要求1所述的一种多频输出的“一拖二”串联谐振中频感应加热电源，其特征在于：所述的谐振单元(4)采用两个相互独立的LC串联谐振电路，串联谐振电路中的一部分谐振电容与开关串联，再与串联谐振电路中的另一部分谐振电容相并联，最后与谐振电感串联构成LC串联谐振电路。控制单元(5)通过控制开关的导通和关断改变谐振单元(4)的电容大小，实现电源的多频率输出。
5.根据权利要求1所述的一种多频输出的“一拖二”串联谐振中频感应加热电源，其特征在于：所述的控制单元(5)采用以DSP芯片为主的控制器，控制单元(5)分别控制整流单元(1)、逆变单元(3)和谐振单元(4)；控制单元(5)控制整流单元(1)的晶闸管触发角，电源启动时缓慢充电滤波单元(2)中的滤波电容，电源运行时控制晶闸管维持最小触发角导通；控制单元(5)通过PWM脉冲控制逆变单元(3)中的功率器件，实现串联谐振中频感应加热电源的扫频调功控制；控制单元(5)通过控制谐振单元(4)的开关导通和关断，实现串联谐振中频感应加热电源的多频率输出。
6.根据权利要求5所述的一种多频输出的“一拖二”串联谐振中频感应加热电源，其特征在于：所述的控制单元(5)实现滤波电容的充电控制、他激转自激的启动控制、功率调节的扫频调功控制和“一拖二”电源负载功率的自动匹配控制等功能。
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