HE670ACC100
HE670ACC100
HE670ACC100
HE670ACC100
使用两个变压器。大功率变压器输出经整流滤波后直接供给V／I转换部分使用。小功率变压器输出经整流滤波后通过78和79系列芯片获得±V和±5V电压。
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《邮@.com》大功率变压器输出经整流滤波后稳压，然后提供给V／I转换电路使用。此方案输出功率可以满足要求，且V／I转换部分电源稳定度可以保证。本电流源输出电压设置在40V以内，因此最大输出功率为80W，为留有裕量，大变压器选择双18V、100W。使用三端稳压芯片LM338K获得40V的电压，这样LM338K输入输出压差为6V左右，输出电流2A时耗散功率为W左右，LM338K最大输出电流达5A，耗散功率50W。
电源部分的电路如图2所示。
1．3D／A转换
使用位D／A转换器。采用位串行D／A转换器MAX531。D／A转换器输出的电压信号加到放大器F5的同相端，F5的输出接到中功率三极管D66A的基极，D66A与大功率三极管2N3055组成达林顿形式。RL为负载，它接在+40V电源和达林顿之间，与之并联的二极管是考虑到负载有可能是电感而加上的，作用是断电时消耗电感负载的能量，保护系统。R为取样电阻，阻值0．33Ω，功率10W，取样电阻把电流线性转化成电压信号，经同相放大器后加到放大器F5的反向端。设负载上的电流为I，反馈回路中同相放大器增益为K，输入信号电压值为U，则U=0．33xIxK，调节同相放大器的增益，使0．33xK=1，可使U=I，这样实现了电压转换电流功能，且消除了三极管β值随温度变化带来的影响。
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