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一、电路详解夏普VC—B78DT录像机是在VC—A62DT、VC—K88K89、VC—A508DT基础上发展起来的,是一种较新的机型。在我国,目前流行的夏普录像机很少采用开关式电源,一般采用的是变压器降压、整流滤波、稳压器稳压输出方式。VC—B78DT采用了先进的开关电源,这样就扩大了使用市电电压的范围,可在176～264V正常使用,除此之外开关电源近具有电压稳定效果好、损耗小和重量轻等优点。 VC—B78DT的电源也是采用开关电源,图1是开关电源方框图。二、工作原理
First, the circuit Detailed SHARP VC-B78DT VCR is VC-A62DT, VC-K88K89, VC-A508DT developed on the basis of a relatively new model. In China, the popular Sharp VCR rarely use the switch-mode power supply, the general use of the transformer buck, rectifier filter, voltage regulator regulator output. VC-B78DT uses advanced switching power supply, thus expanding the use of mains voltage range, the normal use of 176 ~ 264V, in addition to the switching power supply near the voltage stability with good effect, small loss and light weight and so on. VC-B78DT power supply is also used switching power supply, Figure 1 is the switching power supply block diagram. Second, the working principle