摘要:
Methods of obtaining a plurality of target pulse widths are disclosed. A plurality of intermediate pulse widths are calculated between two time-adjacent target pulse widths from a plurality of target pulse widths, the intermediate pulse widths determined from incremental and sub-incremental clock counts; and the plurality of intermediate pulse widths are output to a motion device.
摘要:
An electro-hydraulic proportional flow valve speed regulating control system includes a PWM regulating device, an electro-hydraulic proportional flow valve, a hydraulic executing element, a speed measuring module, an electro-hydraulic proportional flow valve characteristic measuring module, and a feedforward control module. The speed measuring module measures a speed of the hydraulic executing element and sends the measured result to the electro-hydraulic proportional flow valve characteristic measuring module which measures a minimum actuating current and a maximum actuating current of the electro-hydraulic proportional flow valve and a maximum speed of the hydraulic executing element and inputs these measured results to the feedforward control module. With these measured results, the feedforward control module establishes a corresponding relationship between the speed of the hydraulic executing element and the valve core current and inputs the valve core current in correspondence with the setting speed value to the PWM regulating device, thereby driving the electro-hydraulic proportional flow valve.
摘要:
A method and apparatus for providing closed loop feedback control is presented. The method consists of a hybrid software and hardware solution to take advantage of the useful attributes of both. Analog signals output by the device are sampled at a rate sufficient to preserve all necessary high frequency information, and preprocessed at high speed in hardware. The outputs of the preprocessing stage are then operated on in software at much lower speeds. The method and apparatus allow for the complex real time processing of feedback signals in the digital domain, yet allow the cost efficiencies and programming flexibility of a standard micro-controller to be utilized.
摘要:
Die Erfindung betrifft einen elektromagnetisch verträglich, getakteten Verstärker für Gleichstrom-/Wechselstromverstärkung, insbesondere für Drehstrom-Winkelschritt-Antriebsregelsysteme, mit für jeweils eine Phase
einem Transistor-Brücken-Leistungsverstärker, einem Ausgangsfilter und einem Spannungssensor, wobei der Transistor-Brücken-Leistungsverstärker mindestens einen ersten und einen zweiten Schalttransistor aufweist, zu denen jeweils Dioden parallel geschaltet sind, und der Ausgangsfilter in Reihe geschaltet mindestens einen Strombegrenzungswiderstand, eine Filterinduktivität und einen Ladekondensator aufweist und Leistungsthyristoren nach den Spannungsvorzeichen gepolt, parallel zu dem Strombegrenzungswiderstand geschaltet sind.
摘要:
A system for driving a hard disk drive spindle motor is disclosed. The system comprises a spindle motor control circuit (120) and a spindle motor power circuit (220). The system also includes at least one disk (22) attached to a rotatable spindle (21) and a spindle motor (400) which receives power signals from the spindle motor power circuit (220) and controls the rotation of the spindle (21). The spindle motor control circuit (120) comprises a multiplexor (127) which transmits either a pulse width modulation signal or a current control signal in response to a mode selection signal, and a spindle predriver (125) which receives the multiplexor output signal and transmits spindle motor control signals to the spindle motor power circuit (220).
摘要:
A control apparatus for controlling a motor of an air conditioner includes a converter (2), having switching means (2a) for improving an input power factor, for converting an AC power to a DC power and an inverter (4) for converting the DC power supplied from the converter to the AC power and supplying to a compressor (3). The output DC voltage of the converter is detected by a DC voltage detecting circuit. An input alternating current is detected by a current detecting circuit (11). A microcomputer (13) for controlling the inverter calculates a current command from data stored on the basis of the detected voltage. The detected current is compared with the current command, an ON percentage of a PWM signal to control the switching means is obtained, and the PWM signal is generated.
摘要:
The invention relates to a process for adjusting a real value (actual value) of a physical quantity to a preset value (ideal value) with the following steps: (a) the difference between the ideal value and the actual value (referred to below as the control deviation) and its sign (referred to below as the control sign) is determined repeatedly at intervals; (b) the control deviation is converted into at least one electrical signal during or after each measurement, and the duration thereof (referred to below as the control deviation duration) is proportional to the absolute value of the control deviation at least in the range of the ideal value, and the value thereof is a function of the control sign; (c) the loading of an analogue electrical memory arrangement is affected by this at least one electrical signal during the control deviation duration; (d) depending on the value of the loading of the memory arrangement the physical quantity is directly or indirectly affected to keep it in the range of the ideal value. Said control process which is partially based on analogue and partially on digital components produces, for a motor which uses a microprocessor for commutating or controlling, a speed controller with a very simple structure.
摘要:
A programmed PWM controller for controlling an inverter is provided which includes memory means (35) for storing a plurality of drive data words representing a pulsewidth modulation sequence, each drive data word including a driveword and a drivetime word, the drivewords being used to operate the inverter; first digital means for selectively retrieving each of the plurality of drive data words from the memory means (35) according to the pulsewidth modulation sequence in response to a next drive data word request signal; and second digital means governed by the drivetime word for generating the next drive data word request signal.