电流采样电阻及NTC修改电路设计思路
变频器功率
Kw 额定电流A 阻值选择m Ω额定时的采样电压输入mV 1.5倍载峰值电压输入mV 2倍载峰值电压输入mV 2.5倍载峰值电压输入
3.788.0090.50135.74180.99226.24498.00101.81152.71203.6225
4.52
5.512
6.00101.81152.71203.62254.52
7.517 4.0096.15144.23192.30240.381123 3.0097.57146.35195.13243.921532 2.0090.50135.74180.99226.241
8.538 1.5080.60120.90161.20201.50变频器功率Kw 额定电流A 阻值选择m Ω额定时的采样电压输入mV 1.5倍载峰值电压输入mV 2倍载峰值电压输入mV 2.5倍载峰
值电压输入
3.788.0090.50135.74180.99226.24498.00101.81152.71203.6225
4.52
5.512
6.00101.81152.71203.62254.52
7.517 4.0096.15144.23192.30240.381123 3.0097.57146.35195.13243.921532 2.0090.50135.74180.99226.24计算公式：
1.5倍额载需正常运行一分钟停机。功率按照1.5倍载考虑
采样输入在200mV以内线性度较好，
最大300mV.2.5倍额载的电流采样需控制在300mV以内
以E4为例，R31/R11=6.8/3.65=R29/R13。最终到CPU电压
小功率机型710选型及参电压功率额定电流放大分子放大分母710放大mV/A几倍电流保护
三相3800.20.6 2.4201514
三相3800.41 4.7201513
三相3800.55 1.5 4.7201513
三相2200.2 1.5 2.420563
三相2200.37 2.5 3.6520563
三相2200.55 3.5 5.120563
三相2200.75 4.5 5.120563
阻值选择mΩ功率
12.00 1.5W
8.002W
6.002W
5.003W
4.003W
2.5倍额定
电流差分输
型号单机用量
额定电流进CPU光耦输出差分电压
额载进CPU 峰值
2.5倍载进CPU 1.86FLQ53-10 8R 10.7420672 2.05261093 2.656527319
2.09FLQ53-10 8R 10.8348256 2.2065504
3.0413762.09FLQ53-12 6R 10.8348256 2.2065504 3.0413761.97FLQ53-10 8R 20.7884464 2.17563093 2.964077333
2.00FLQ53-12 6R
20.8000412 2.1833608 2.9834021.8620.7420672 2.05261093 2.6565273191.652
0.6609036 2.00857536 2.5464383940.35711984 1.96153007 2.4288251832.5倍额定电流差分输
型号
单机用量
额定电流时线性光耦输出差分电
额载进CPU 峰值
2.5倍载进CPU 1.86LR12FTDSR008G(8mR,2W)10.7420672 2.14471147 2.886778667
2.09LR12FTDSR008G(8mR,2W)10.8348256 2.2065504
3.0413762.09LR12FTDBR006G(6mR,2.5W)10.8348256 2.2065504 3.0413761.97LR12FTDBR004G(4mR,2.5W)10.7884464 2.17563093 2.964077333
2.00LR12FTDRR003G(3mR,3W)10.8000412 2.1833608 2.9834021.86
LR12FTDBR006G(6mR,2.5W)
2
0.7420672
2.05261093
2.656527319
U电压=(X*6.8/3.65+3.3)/2。
Overload current:LR2512 2.5W 6mR: 45A LR2512 2.5W 4mR: 55A LR2512 2W 8mR: 35A LR2512 3W 3mR: 70A 此Overload電流可以承受5
秒~~
710最大输出电压
放大倍数
最大进电脑板电额定进CPU电压
最大进CPU电压
0.36248.333333333 3.02 2.0275
3.16
0.453 4.255319149 1.92765957 1.971276596 2.613829790.6795 4.255319149 2.89148936 2.131914894
3.09574468
0.2528.333333333 2.12
2.7
0.42 5.479452055 2.30136986 2.033561644 2.800684930.588 3.921568627 2.30588235 2.034313725 2.802941180.756
3.921568627
2.96470588 2.144117647
3.13235294
6BB
12CB
型及参数计算
6.8
5.1
R29,R31R11,R13
5.1 4.7
6.8 5.1
6.8 5.1
6.8 5.1
6.8 5.1
5.1 4.7
2.166 5.1 4.7
1.35528.2 4.7
额载功率R29,R31R11,R13
0.512 6.8 5.1
0.648 6.8 5.1
0.864 6.8 5.1
1.156 6.8 5.1
1.587 6.8 5.1
2.048 5.1 4.7