高频感应加热机目前已经被广泛的应用在了工业加工和制造领域，由于加工效率高、器件受热均匀而广受欢迎。将会对高频加热电源的机体内部结构进行简要的分析。

　　目(mu)前市(shi)面上(shang)的(de)(de)高(gao)频加(jia)热电(dian)(dian)(dian)(dian)源主要(yao)结构是整流电(dian)(dian)(dian)(dian)路(lu)、滤波电(dian)(dian)(dian)(dian)路(lu)和(he)逆(ni)变(bian)(bian)电(dian)(dian)(dian)(dian)路(lu)。高(gao)频加(jia)热的(de)(de)负载(zai)是感应线圈(quan)和(he)被加(jia)热工件，它们可(ke)等效为一个电(dian)(dian)(dian)(dian)感和(he)电(dian)(dian)(dian)(dian)阻(zu)串(chuan)联(lian)，负载(zai)呈感性。实际使用(yong)中为了提高(gao)功率(lv)因数和(he)逆(ni)变(bian)(bian)器的(de)(de)输出功率(lv)，一般(ban)采用(yong)加(jia)补偿(chang)电(dian)(dian)(dian)(dian)容的(de)(de)方法，使补偿(chang)后的(de)(de)负载(zai)在电(dian)(dian)(dian)(dian)源的(de)(de)工作频率(lv)上(shang)谐振(zhen)。但是任何导体在被加(jia)热时其电(dian)(dian)(dian)(dian)阻(zu)率(lv)和(he)导磁率(lv)都会(hui)发生变(bian)(bian)化，尤(you)其是在居里点附近。电(dian)(dian)(dian)(dian)源的(de)(de)频率(lv)会(hui)随负载(zai)的(de)(de)变(bian)(bian)化而变(bian)(bian)化。

　　在进一步的(de)细分过(guo)程中(zhong)，我们可以根(gen)据机(ji)体的(de)补偿形式(shi)(shi)(shi)(shi)，将目前(qian)市(shi)面上的(de)高(gao)频(pin)加(jia)热电(dian)(dian)源(yuan)(yuan)分为(wei)两(liang)种，即并(bing)联谐(xie)(xie)振(zhen)式(shi)(shi)(shi)(shi)和串联谐(xie)(xie)振(zhen)式(shi)(shi)(shi)(shi)。并(bing)联谐(xie)(xie)振(zhen)式(shi)(shi)(shi)(shi)的(de)加(jia)热电(dian)(dian)源(yuan)(yuan)在工作过(guo)程中(zhong)所(suo)采用(yong)的(de)逆(ni)(ni)变(bian)(bian)(bian)(bian)器(qi)(qi)是并(bing)联谐(xie)(xie)振(zhen)逆(ni)(ni)变(bian)(bian)(bian)(bian)器(qi)(qi)，其(qi)负载(zai)为(wei)并(bing)联谐(xie)(xie)振(zhen)负载(zai)。通常(chang)(chang)需电(dian)(dian)流源(yuan)(yuan)供电(dian)(dian)，在高(gao)频(pin)加(jia)热中(zhong)，电(dian)(dian)流源(yuan)(yuan)通常(chang)(chang)由整流器(qi)(qi)加(jia)一个大电(dian)(dian)感(gan)构成。由于电(dian)(dian)感(gan)值较大，可以近似认为(wei)逆(ni)(ni)变(bian)(bian)(bian)(bian)器(qi)(qi)输入端(duan)电(dian)(dian)流固(gu)定不变(bian)(bian)(bian)(bian)。交(jiao)(jiao)替(ti)开通和关断逆(ni)(ni)变(bian)(bian)(bian)(bian)器(qi)(qi)上的(de)开关器(qi)(qi)件就可以在逆(ni)(ni)变(bian)(bian)(bian)(bian)器(qi)(qi)的(de)输出端(duan)获得交(jiao)(jiao)变(bian)(bian)(bian)(bian)的(de)方波电(dian)(dian)流，其(qi)电(dian)(dian)流幅(fu)值取决(jue)于逆(ni)(ni)变(bian)(bian)(bian)(bian)器(qi)(qi)的(de)输入端(duan)电(dian)(dian)流值，频(pin)率取决(jue)于开关器(qi)(qi)件的(de)开关频(pin)率。

　　在了解了并(bing)(bing)联(lian)(lian)谐(xie)(xie)振式(shi)的(de)(de)(de)加(jia)(jia)(jia)(jia)热电(dian)(dian)(dian)源(yuan)运(yun)行原(yuan)理后，我(wo)们再来看(kan)一下串(chuan)(chuan)联(lian)(lian)谐(xie)(xie)振式(shi)的(de)(de)(de)加(jia)(jia)(jia)(jia)热电(dian)(dian)(dian)源(yuan)的(de)(de)(de)运(yun)行原(yuan)理。与并(bing)(bing)联(lian)(lian)谐(xie)(xie)振式(shi)加(jia)(jia)(jia)(jia)热电(dian)(dian)(dian)源(yuan)不(bu)同的(de)(de)(de)是(shi)，串(chuan)(chuan)联(lian)(lian)谐(xie)(xie)振式(shi)的(de)(de)(de)加(jia)(jia)(jia)(jia)热电(dian)(dian)(dian)源(yuan)在工(gong)作过程中(zhong)所采用的(de)(de)(de)逆变(bian)(bian)(bian)器(qi)(qi)是(shi)串(chuan)(chuan)联(lian)(lian)谐(xie)(xie)振逆变(bian)(bian)(bian)器(qi)(qi)，其负(fu)载为串(chuan)(chuan)联(lian)(lian)谐(xie)(xie)振负(fu)载，通(tong)常需电(dian)(dian)(dian)压(ya)源(yuan)供(gong)电(dian)(dian)(dian)。在感应加(jia)(jia)(jia)(jia)热中(zhong)，电(dian)(dian)(dian)压(ya)源(yuan)通(tong)常由整流器(qi)(qi)加(jia)(jia)(jia)(jia)一个大电(dian)(dian)(dian)容构成。由于(yu)电(dian)(dian)(dian)容值(zhi)较(jiao)大，可以近似(si)认(ren)为逆变(bian)(bian)(bian)器(qi)(qi)输(shu)入端电(dian)(dian)(dian)压(ya)固定不(bu)变(bian)(bian)(bian)。交替(ti)开(kai)(kai)通(tong)和(he)关(guan)断逆变(bian)(bian)(bian)器(qi)(qi)上的(de)(de)(de)开(kai)(kai)关(guan)器(qi)(qi)件就可以在逆变(bian)(bian)(bian)器(qi)(qi)的(de)(de)(de)输(shu)出(chu)端获得交变(bian)(bian)(bian)的(de)(de)(de)方波电(dian)(dian)(dian)压(ya)，其电(dian)(dian)(dian)压(ya)幅(fu)值(zhi)取决(jue)于(yu)逆变(bian)(bian)(bian)器(qi)(qi)的(de)(de)(de)输(shu)入端电(dian)(dian)(dian)压(ya)值(zhi)，频(pin)率(lv)取决(jue)于(yu)器(qi)(qi)件的(de)(de)(de)开(kai)(kai)关(guan)频(pin)率(lv)。