Document Type and Number:
Japanese Patent JPS4535933
Kind Code:
B1
Abstract:
1,129,420. Automatic speed and power control. ROBERT BOSCH, G.m.b.H. July 18, 1967 [July 20, 1966], No.32961/67. Heading G3R. [Also in Division H2j An emergency current installation comprises an engine driving a three-phase generator whose power is measured by a wattmeter providing signals to an engine controller for counteracting changes of speed. In addition, signals representing deviations from a nominal frequency are passed through an integrating amplifier to be added to the wattmeter signals. The generator voltage Ul is supplied to a frequency selective amplifier 29 through a network 41-44 which effects a phase shift of 90 degrees, this amplifier being set to produce no phase-shift at the nominal frequency of the generator, and to reduce or increase the phaseshift if the actual frequency is too low or too high. The output voltage U2 of the amplifier 29 is supplied to a phase reversing stage 32 having output voltage U3, the voltages U1, U2, U3, being fed to a phasesensitive rectifier 33 providing the regulating voltage UB when deviations from the nominal frequency occur. In the amplifier 29, transistor 47 serves as a driving stage for transistors 46, 48, operating in push-pull. A frequency-responsive negative feedback network comprises a double-T network 65-75 in which resistor 67 compensates for temperature variations. Fine tuning is provided by resistors 69 and 41. If the speed of the generator tends to decrease, for example, the voltage across capacitors 38, 39, are respectively increased and decreases so that the summation of the voltages on resistors 36, 37 results in an output voltage for increasing the speed of the engine, and the frequency resumes the nominal value.
Application Number:
JP4617667A
Publication Date:
November 16, 1970
Filing Date:
July 19, 1967
Export Citation:
International Classes:
H02P9/42