The output current is never influenced by power supply, realizing the invariableness of load current.
输出电流不受供电电压波动的影响，实现了电路的恒流功能。
2
An invariableness pressure decompression valve is added to common PCM to keep pressure discrepancy invariable approximately.
在原有PCM流量控制阀组中加上一个定差减压阀，使压力差近似保持定值。
3
Voxel attributes, voxel density and the way to keep the invariableness of voxel density are studied, and the method of parallel data transmission link is discussed.