Electromagnetic adjuster current controller - has measuring resistor incorporated in lead between power transistor and magnetic coil
申请公布号:DE4134056(A1)
申请号:DE19914134056
申请日期:1991.10.15
申请公布日期:1992.04.23
发明人:LANG, ARMIN, 7070 SCHWAEBISCH GMUEND, DE
分类号:H01H47/00;H01H47/32;H02M3/156
主分类号:H01H47/00
摘要:The electromagnetic proportional adjustor has a magnetic coil (7) whose feed current is controlled by a power transistor (1) in dependence on a pulsed voltage, modulated by a comparator (10) for a rated and actual value voltage. In the lead (6) between the power transistor and the magnetic coil is incorporated a measuring resistor (3), with a freewheel diode (19) in parallel to the coil and resistor. The resistor terminal on the power transistor side is coupled to the non-inverting input (25) of an operational amplifier (34) via a resistor (20) of a voltage divider. On the coil side, the measuring resistor terminal is coupled to the inverting input (24) of the rectifier via a series resistor (21). The amplifier output (26) is coupled to its inverting input via a push-pull resistor (23), and to a nodal point, coupled to a voltage divider second resistor (22) via an output resistor (27). USE/ADVANTAGE - For car servo-steering etc., with protection of measuring resistor against destruction by connecting faults.
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