36results about How to "Compensation for non-linearity" patented technology

A linear motor system includes a discontinuous linear motor and motor control device. The discontinuous linear motor includes a mover and a plurality of individual motors spaced from each other along a movement path of the mover. Each of the individual motors functions as an armature on a primary side of one independent linear motor. A sensor, arranged to act as a linear scale, is disposed for each individual motor and detects a position of the mover. The motor control device includes a plurality of individual motor control units and a multiple unit controller to comprehensively control the individual motor control units. The individual motor control units control the individual motors disposed in curved path sections, and each of the individual motor control units includes a curved-line correspondence corrector to correct a detection value obtained from the sensor according to a relationship between a curved line of the path and a position of the sensor.

The apparatus controls a tilt angle of a tilt mirror in high speed with high stability, realizing non-linearity compensation. The apparatus includes: a control signal producing unit, which produces a control signal, for feed-forward controlling of the mirror into a target tilt angle, based on a parameter that determines the target tilt angle; a digital filter for removing a resonance frequency component, which is caused by an angle response of the tilt mirror, in the control signal, which is produced by the control signal producing unit; and a square root calculating unit for performing digital square-root calculation so that non-linearity of the control signal, from which the resonance frequency component has been removed, is compensated for.

Disclosed is a control device for controlling a variable-colour light source, the variable-colour light source comprising a plurality of individually controllable colour light sources. The control device comprises a control unit for generating, responsive to an input signal indicative of a colour and a brightness, respective activation signals for each of the individually controllable colour light sources. The control unit is configured to generate the activation signals from the input signal and from predetermined calibration data indicative of at least one set of colour values for each of the individually controllable light sources.

A scanning probe microscope (SPM) is provided capable of a narrow to a wide range observation according to observed targets or purposes without replacing a scanner while maintaining a high resolution. The SPM is provided with a probe-side scanner 10 and a sample-side scanner 11. The probe-side scanner 10 is to move the probe 13 in X-, Y-, Z-axis directions, and the sample-side scanner 11 is to move the sample 12 in the X-, Y-, Z-axis directions. A scanner with a small maximum scan range is used as the probe-side scanner 10; a scanner with a large maximum scan range is used as the sample-side scanner 11; and both can be switched between each scanner for use according to the observed targets or purposes. Alternatively, the probe-side scanner 10 is used for scanning in a narrow range, and the sample-side scanner 11 is used to move the field of view.

A voltage controlled oscillator and a method of operating a voltage-controlled oscillator are disclosed. The oscillator comprises a current controlled oscillator having a variable frequency current output, a first control path for generating a first control current having a first adjustable gain, and a second control path for generating a second control current having a second adjustable gain. A summer is provided for adding the first and second control currents to obtain a summed control current, and for applying the summed control current as an input current to the current controlled oscillator. A control sub-circuit is used for controlling the gain of the first control current as a function of a defined voltage on the second control path to maintain constant the gain of the current output of the current controlled oscillator over a given operating range of the current controlled oscillator.

The invention disclose a measurement system for sea water temperature, which comprises a nonequilibrium bridge circuit unit, a constant current source generation circuit unit, a voltage follower circuit unit and a filter amplifier circuit unit, wherein the input end of the nonequilibrium bridge circuit unit is connected with an anode of direct voltage through a resistor R8; the output end of the nonequilibrium bridge circuit unit is connected with the voltage follower circuit unit; the output end of the constant current source generation circuit unit is connected with the nonequilibrium bridge circuit unit; the voltage follower circuit unit is connected with the filter amplifier circuit unit through a resistor R9 and a resistor R10; and the input end of the constant current source generation circuit unit is connected with a plus 5V power supply. The measurement system has the characteristics of high sensitivity, good stability, long service life and the like; the measurement precisionof the measurement system is much higher than that of the traditional thermocouple or the pressure type thermodetector; and the measurement system has obvious technical advantages in the conventionaltemperature measurement range (minus 2 DEG C - 30 DEG C) of the sea water.

The invention discloses a measurement circuit of an LVDT (Linear Variable Differential Transformer). The measurement circuit comprises a sinusoidal pulse width modulator, a signal conditioning circuit, a linear variable differential transformer, a first sampling circuit, a second sampling circuit and a controller; the sinusoidal pulse width modulator is used for outputting pulse width and frequency-adjustable rectangular wave signals; the input end of the signal conditioning circuit is connected with the sinusoidal pulse width modulator; the signal conditioning circuit outputs amplitude and frequency adjustable sinusoidal wave signals; the primary coil of the linear differential transformer is connected with the output end of the signal conditioning circuit to receive the sinusoidal wave signals as LVDT excitation signals; the secondary coil of the linear differential transformer outputs LVDT differential signals; the input end of the first sampling circuit is connected with the primary coil; the input end of the second sampling circuit is connected with the secondary coil; and the controller is connected with the output end of the first sampling circuit and the output end of the second sampling circuit and is used for performing amplitude normalization processing to output an LVDT linear position. With the measurement circuit of the LVDT, relatively complicated analog circuit parameter adjustment is avoided, zero-point residual voltage, phase drift and sensor nonlinearity can be effectively compensated. The measurement circuit has the advantages of high stability and can reduce measurement errors.

The invention discloses a GaAs HBT high-gain broadband linear transconductance unit circuit comprising an input stage subcircuit, a basic transconductance subcircuit, a linear subcircuit, a negative resistance subcircuit and a mirror current source subcircuit, wherein the input stage subcircuit is used for level shift of input differential voltages IN_P and IN_N and conducts shifted signals into the basic transconductance subcircuit; the basic transconductance subcircuit is used for converting the input differential voltage signals into differential current signals; the linear subcircuit is used for improving the linearity of the basic transconductance subcircuit; the negative resistance subcircuit is used for improving the gain of the transconductance circuit; and the mirror current source subcircuit is used for providing bias current for the rest circuits. The circuit is designed and manufactured by a GaAs HBT technology and has wide operation bandwidth; the adopted linear subcircuit can effectively complement the nonlinearity of the circuit and provides excellent linearity; and the negative resistance subcircuit is adopted to effectively solve the conflict between the high-gainrequirement of circuits and transistor saturation and improves high-gain performance.

The invention provides a Maglev (Magnetic Levitation) molecular pump motor control device with an electric power failure compensation function. The Maglev molecular pump motor control device mainly comprises a single-phase controllable rectifier module, a three-phase inverter bridge module, a DSP (Digital Signal Processing) control module, a high-voltage DC (Direct Current) / DC module and a low-voltage DC / DC module. When the Maglev molecular pump motor control device is in normal running, the DSP control module can be used for firstly adjusting busbar voltage into a starting voltage value through the single-phase controllable rectifier module, then controlling the three-phase inverter bridge module to drive a permanent magnetic motor to run and increasing the busbar voltage to a rated value step by step, an external AC (Alternating Current) power supply can be simultaneously monitored through a voltage sensor by a system, the DSP control module controls the high-voltage DC / DC module which serves as a converter to run if external electric power is in failure, the single-phase controllable rectifier module and the three-phase inverter bridge module can be closed, the permanent magnetic motor enters into a power generating mode at the moment, by using a system, energy fed back by the permanent magnetic motor can be converted into a power power supply and a control power supply of a magnetic bearing through the high-voltage DC / DC module and the low-voltage DC-DC module, and the compensation function of the Maglev molecular pump system under the situation that the external electric power is in failure can be realized.

A high-linearity amplifier including a main operational amplifier, a feedback circuit, and a compensation circuit is shown. The feedback circuit couples an output signal of the main operational amplifier to an input port of the main operational amplifier. The compensation circuit is coupled to the input port of the main operational amplifier to compensate for the non-linearity of the feedback circuit. A signal coupled to the input port of the main operational amplifier through the compensation circuit has an inverse phase compared to the output signal of the main operational amplifier.