IC697CBL811
IC697CBL811
IC697CBL811
IC697CBL811
V/I转换电路采用高精度集成运放OP07作为比较放大器,DA的输出电压经跟随器与比较器的同向端相连,比较器的反向端与采样电阻的相连,使电流预设值与测量值直接进行比较,±V电源为OP07提供电源电压,运放的输出电压信号控制达林顿复合三极管的导通,经模拟闭环反馈调整使电流达到设定值,
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《邮@.com》TIP41(10A)是大功率PNP三极管,在本设计中的主要功能是实现功率放大。
采样电阻将电流信号以电压的形式加到运放的输入端,由此构成的电流并联负反馈电路,可以减轻后级电路对D/A的干扰,从而得到恒流输出,大大提高了电流源的稳定性。
根据运算放大器的结构可知,负载电流仅与输入电压和采样电阻的阻值有关,而与负载电阻的大小无关。当输入电压保持不变时,负载电阻在一定范围内变化,而输出电流将保持不变,由此构成恒流源电路。本设计方案的一个主要特点是,采用康铜丝做采样电阻,康铜丝的温度系数约为5ppm/℃,当有电流流过电阻是引起的温度升高对其阻值影响不会太大,其温度特性较好。电路中各电阻均应选用精密电阻,以达到能高的V/I转换精度。V/I转换部分电路图如图4所示。
ABB Taylor Mod 300 6247BP10710 Electronic I/O Module
NEW ABB 164S227 MOD 300 RETROFIT KIT
40 New ABB Taylor IAC5 Mod 300 Input Modules
32 New ABB Taylor IDC5 Mod 300 Input Modules
ABB TAYLOR MOD 300 TERMINAL ASSY CAT# 6247BP10710
ABB TAYLOR MOD 300 HIGH SPEED COUNTER
ABB TAYLOR MOD 300 HIGH SPEED COUNTER
ABB TAYLOR MOD 300 HIGH SPEED COUNTER
Taylor ABB 6204BP10821B-K MOD 300 I/O Module
ABB TAYLOR MOD 300 HIGH SPEED COUNTER
ABB TAYLOR MOD 300 HIGH SPEED COUNTER
ABB TAYLOR MOD 300 HIGH SPEED COUNTER
NEW ABB TAYLOR MOD 300 RTD INPUT 115V 50/60 Hz 125VDC
ABB TAYLOR MOD 300 RELAY 16 OUT N.O.
ABB TAYLOR MOD 300 HIGH SPEED COUNTER I/O MODULE
One ABB Taylor MOD 300 6231BP10830C-B DC C/S Analog
ABB TAYLOR MOD 300 HIGH SPEED COUNTER I/O MODULE
Taylor ABB 601BZ10000B Mod 300 Transfer 601BZ10000-B
Taylor ABB 6004BZ10300B Mod 300 CPU Board 6004BZ10300-B
NEW ABB TAYLOR MOD 300 BUS MODULE 6203FP10800 GENIUS
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ABB TAYLOR 300 MOD 16PT BLOCK MODEL# 6247BP10710C-M
13 New ABB Taylor Mod 300 Input & Output Modules Relays
NEW ABB TAYLOR MOD 300 ELEC MODULE 6245BP10710 GENIUS
ABB Taylor MOD 300 Controller Fan Assembly S17 #2
TAYLOR ABB MOD 300 PROC. POWER SUPPLY 6020NZ10700
NEW ABB TAYLOR MOD 300 BUS MODULE 6203FP10900 GENIUS
ABB MOD 300 POWER DIST. PANEL 6152NA10700
ABB MOD 300 6230BP10710D ANALOG BLOCK NEW FACT. SEALED
TAYLOR ABB MOD 300 BCKUP MEM MOD 6214BZ10110
TAYLOR ABB MOD 300 BCKUP MEM MOD 6214BZ10110
TAYLOR ABB MOD 300 SC D/F MOD 6205BZ10000
TAYLOR ABB MOD 300 I/O XFER 6015BZ10000
TAYLOR ABB MOD 300 CPU 6004BZ10300
NEW ABB TAYLOR MOD 300 16PT MODULE 6241BP10411 GENIUS
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TAYLOR ABB MOD 300 MEM EXP MOD 6018BZ10200
TAYLOR ABB MOD 300 CONTROLLER BOARD 6051NA10424
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TAYLOR ABB MOD 300 I/O EXT. 6216BZ10000
TAYLOR ABB MOD 300 DCN INT. 6253BZ10000
TAYLOR ABB MOD 300 CNTLR FAN ASSY P/N: 6215FZ10100
NEW ABB TAYLOR MOD 300 BUS MODULE 6203FP10900 GENIUS
TAYLOR ABB MOD 300 BCKUP MEM MODULE 6014BZ10100
TAYLOR ABB MOD 300 I/O EXT. MODULE 6016BZ10000
TAYLOR ABB MOD 300 DIGITAL CONTROLLER BD 6050NA10424
NEW ABB TAYLOR MOD 300 32PT MODULE 6241BP10411 GENIUS
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TAYLOR ABB MOD 300 TRANSFER MODULE 6215BZ10000
ABB Taylor MOD 300 Controller Fan Assembly S17 #1
NEW ABB TAYLOR MOD 300 32PT MODULE 6241BP10411 GENIUS
NEW ABB TAYLOR MOD 300 32PT MODULE 6241BP10421 GENIUS
20" LCD (Modified for ABB Mod 300 System)
NEW ABB TAYLOR MOD 300 CURR MODULE 6231BP10920 GENIUS
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19" LCD (Modified for ABB Mod 300 System)
NEW ABB TAYLOR MOD 300 16PT MODULE 6240BP10411 GENIUS
TAYLOR ABB MOD 300 FIELD BUS MODULE 6227BZ10200
ABB TAYLOR MOD 300 CURR MODULE 6231BP10920 GENIUS
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TAYLOR ABB MOD 300 CPU 6024BZ10101
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ABB / MOD 300 Graphics Converter, 120VAC, PN -GC315AB/A
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ABB / MOD 300 Graphics Converter, 220VAC, PN -GC315AB/B
NEW ABB TAYLOR MOD 300 16PT MODULE 6241BP10411 GENIUS
ABB MOD 300 BULK POWER SUPPLY 6024NR14130
NEW ABB TAYLOR MOD 300 RELAY MODULE 6248BP10811 GENIUS
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TAYLOR ABB MOD 300 D/M MODULE 6009BZ10000
NEW ABB TAYLOR MOD 300 ELEC MODULE 6248BP10811 GENIUS
TAYLOR ABB MOD 300 SIM MODULE 6010BZ10000
NEW ABB TAYLOR MOD 300 CURR MODULE 6231BP10920 GENIUS
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TAYLOR ABB MOD 300 VIDEO MODULE 6008BZ10000
NEW ABB TAYLOR MOD 300 16PT MODULE 6240BP10411 GENIUS
NEW ABB TAYLOR MOD 300 ELEC MODULE 6248BP10811 GENIUS
TAYLOR ABB MOD 300 PROCESSOR MODULE 6024BP10300
NEW ABB TAYLOR MOD 300 RELAY MODULE 6248BP10811 GENIUS
TAYLOR ABB MOD 300 SERIAL I/O MODULE 6007BG10000
NEW ABB TAYLOR MOD 300 PLC MODULE 6245BP10710 GENIUS
NEW ABB TAYLOR MOD 300 16PT MODULE 6240BP10411 GENIUS
TAYLOR ABB MOD 300 F-BUS INTERFACE 6203BZ10000
ABB TAYLOR MOD 300 PLC MODULE 6245BP10710 GENIUS
ABB MOD 300 FIELD BUS MODULE 2-CHANNEL P/N 6204BZ10200
NEW ABB TAYLOR MOD 300 RELAY MODULE 6248BP10811 GENIUS
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ABB MOD 300 I/O XFER MODULE P/N 6215BZ10000
NEW ABB TAYLOR MOD 300 ELEC MODULE 6240BP10411 GENIUS
TAYLOR ABB MOD 300 D/F MODULE 6005BZ10000
TAYLOR ABB MOD 300 D/F BOARD 6005BZ10000E
ABB Taylor MOD 300 6230BP10720B-K Analog AC I/O Module
TAYLOR ABB MOD 300 CPU 6204BZ10100
ABB Taylor MOD 300 6230BP10720C-M Analog AC I/O Module