利盈娱乐(中国)创新平台有限公司

buck电(dian)(dian)(dian)流馈(kui)(kui)电(dian)(dian)(dian)全(quan)桥拓(tuo)(tuo)扑(pu)逐(zhu)个根(gen)本(ben)工作(zuo)原理这种(zhong)拓(tuo)(tuo)扑(pu)如图  所(suo)示。它与(yu)图所(suo)示的 buck 电(dian)(dian)(dian)压(ya)馈(kui)(kui)电(dian)(dian)(dian)全(quan)桥电(dian)(dian)(dian)路相似，同样(yang)没(mei)有输出电(dian)(dian)(dian)感。但还比 后电(dian)(dian)(dian)路少了 buck 滤波电(dian)(dian)(dian)容 Cl 。不过可以为此(ci)处(chu)仍有一个由次级输出 电(dian)(dian)(dian)容依据(ju)变压(ya)器臣比平方关系(xi)折(zhe)射的当量(liang)电(dian)(dian)(dian)容 CIV ，其滤波功用与(yu)同容量(liang)实践电(dian)(dian)(dian)容相同 。

脉宽调制器误差放大图5.10buck电流馈电全桥电路。这里省去了常用的buck输出滤被电容Cl。图中画有当量电容CIV，它是一切主辅输出电容折算到初级的电容值。斜对角的两个开关管同时导通。使行将关断的开关对管和行将导通的开关对管短时堆叠导通（lμs）对电路工作十分有利。行将关断的功率开关管和(he)行(xing)将导通的开(kai)关(guan)(guan)对管同时导通时，由于LIC未(wei)接Cl）呈现高阻抗(kang)，桥路一切的输入、输出接点电(dian)(dian)压(ya)均降为(wei)(wei)零(ling)。正是这个(ge)高阻抗(kang)使(shi)桥路的供电(dian)(dian)源成为(wei)(wei)恒流源 。Zl和(he)D8构成高端电(dian)(dian)压(ya)钳位电(dian)(dian)路，使(shi)后关(guan)(guan)断的开(kai)关(guan)(guan)管关(guan)(guan)断电(dian)(dian)压(ya)不(bu)超越VI与所(suo)(suo)示电(dian)(dian)路一样，该电(dian)(dian)路用一个(ge)输入电(dian)(dian)感替代一切所(suo)(suo)示电(dian)(dian)路的输出电(dian)(dian)感 。

因而(er)，讨(tao)论的(de)一切优点 。该(gai)电(dian)(dian)(dian)路(lu)晶(jing)(jing)体(ti)(ti)管(guan)(guan) Ql Q4  不(bu)像图(tu) 5.8 所(suo)示(shi)电(dian)(dian)(dian)路(lu)那样(yang)运用(yong)调宽(kuan)调制 。两对斜对角(jiao)的(de)晶(jing)(jing)体(ti)(ti)管(guan)(guan)以 半个(ge)周期轮番导通 ，而(er)且两者之间不(bu)像图(tu) 5.9 所(suo)示(shi)的(de) buck 电(dian)(dian)(dian)压(ya)馈电(dian)(dian)(dian)拓扑那样(yang)需留(liu)死区时(shi)间 。 图(tu) 5.10  所(suo)示(shi)电(dian)(dian)(dian)路(lu)中的(de)每(mei)对晶(jing)(jing)体(ti)(ti)管(guan)(guan)的(de)导通时(shi)间都稍(shao)大(da)于半个(ge)周期 。通常经过(guo)晶(jing)(jing)体(ti)(ti)管(guan)(guan)的(de)存(cun)储时(shi)间（ 对慢速管(guan)(guan)〉 或(huo)加一些廷时(shi) （ 对快速晶(jing)(jing)体(ti)(ti)管(guan)(guan)或(huo) MOSFET 管(guan)(guan)） 完成(cheng)。而(er)输出电(dian)(dian)(dian)压(ya)的(de)调理(li)(li)是经过(guo) 调理(li)(li) buck  电(dian)(dian)(dian)路(lu) Q5 的(de)导通脉宽(kuan)完成(cheng)的(de)。

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