73results about How to "High precision output" patented technology

To improve the probability of error correction, thereby generating correct read data. Data is read from the same sector by a number of times and a majority decision is done in the same address, thereby the most frequently read value is regarded as the true data value in the address. For example, for an address 00, “00” is handled as a true data value.

A laser displacement measurement system including a radiation source for transmitting radiation to a target, an R.F. transmitter oscillator for modulating the amplitude of the radiation at a first frequency, a detector for sensing the radiation reflected from the target, an R.F. local oscillator for providing an R.F. signal at a second frequency, a first mixer circuit, responsive to the oscillators for providing a local I.F. signal which is the difference between the first and second frequencies, a second mixer circuit, responsive to the detector and the R.F. local oscillator, for providing a reflected I.F. signal which is the difference between the second frequency and the modulation frequency of the reflected radiation, and a phase detector, responsive to the local and reflected I.F. signals, for detecting a first phase difference between the signals representative of the distance of the target.

There is provided a rotating electric machine including a rotation sensor unit capable of demonstrating a shielding effect over a wide frequency bandwidth and a manufacturing method therefor. In the rotating electric machine, a power unit provided with a switching element that controls an electric current that flows in a stator winding and a magnetic-field current control circuit unit provided with a switching element that controls an electric current that flows in a rotor winding are arranged on a predetermined surface of one of a pair of brackets that pivotably support a rotor shaft, and the rotation sensor unit is disposed in the vicinity of the predetermined surface of the one bracket; The rotating electric machine is characterized in such a way that there is provided a ring-shaped member that is fixed on the outer surface of the rotation sensor unit, and the ring-shaped member is configured with a non-magnetic unit having an electric conductivity and a magnetic unit.

The embodiments of the present invention disclose a current working point giving system and method for a permanent magnet alternating-current motor. The system comprises a pseudo model feedback system, a torque controller, a MTPA solution unit and a flux weakening working point switching unit; the pseudo model feedback system enables the current working point giving system for the permanent magnetalternating-current motor to be de-coupled from other control systems with the direct-axis current final given value and quadrature-axis current final given value of a previous control beat adopted as input, so that the bandwidth of the torque controller can be designed to be very high, and the feedback of the parameters and output torque estimated value of the permanent magnet motor can be realized; the torque controller can be used for achieving the fast and high-precision output of torques; the MTPA solution unit can be used for accurately calculating MTPA curves under different loads; andthe flux weakening working point switching unit can be used for achieving flux weakening control and MTPA control switching balance, a flux weakening control part can also be decoupled from the othercontrol systems, and therefore, flux weakening control response speed can be increased. With the system and method adopted, the current working point of the permanent magnet alternating-current motorcan be given quickly and effectively, and the full-working area control performance of the permanent magnet motor can be improved.

To obtain an amplifier circuit capable of realizing low power consumption and high-precision output. A controlling unit controls each switch of an offset correction circuit to select one capacitor associated with a voltage level of an input signal selected by an input signal selection unit, have an offset voltage of an operational amplifier generated according to the voltage level of the input signal stored by the selected capacitor, and correct an output of the operational amplifier by using the offset voltage held by the selected capacitor.

An oxygen sensor generating an accurate output concerning low-concentration exhaust gas positioned downstream of a three-way catalyst. The oxygen sensor includes an exhaust gas side electrode exposed to an exhaust gas; a reference gas side electrode exposed to a reference gas serving as a reference for oxygen concentration; and an electrolyte positioned between the exhaust gas side electrode and the reference gas side electrode. Further, a reduction mechanism positioned toward a front surface of the exhaust gas side electrode ensures the ratio of the amount of exhaust gas introduced to the exhaust gas side electrode to the amount of an exhaust gas flow to the outside of the oxygen sensor is smaller than the ratio of the amount of exhaust gas introduced to an electrode for the air-fuel ratio sensor to the amount of an exhaust gas flow to the outside of the air-fuel ratio sensor.

Disclosed is an apparatus includes a text input device that inputs text data provided with confidence measure, as subject for mining, a language processing unit that performs language analysis of the input text data provided with the confidence measures, a confidence measure exploiting characteristic word count unit that counts the characteristic words in the input text to provide a count result and that exploits the statistical information and the confidence measures provided in the input text to correct the count result obtained, a characteristic measure calculation unit that calculates the characteristic measure of each characteristic word from the corrected count result, a mining result output device that outputs the characteristic measure of each characteristic word obtained, a user operation input device for a user to input setting for language processing of the input text and setting for a technique for calculating the characteristic measure being found, a mining process management unit that transmits a user's command delivered from the user operation input device to respective components, and a statistical information database that records and holds the statistical information representing the property of the input text that may be presupposed.

Disclosed is a driving circuit for driving a capacitive load promptly to a target voltage. A first period and a second period are provided in one data driving period. During the first period, a transistor amplifier for driving the load for charging, with a setting drive voltage (V1), and a transistor amplifier for driving the load for discharging, with a setting drive voltage (V2), with V1 G09G 3/20 H03F 3/45 16 30 10 2004/2/12 1521714 2004/8/18 100495491 2009/6/3 2009/6/3 2009/6/3 Nippon Electric Co. Japan Tsuchi Hiroshi li xianglan 11021 The Patent Agency of the Chinese Academy of Sciences Inside the Chinese Academy of Sciences, No.52 Sanlihe Road, Fuwai, Beijing 100864 Japan 2003/2/12 2003-034130

The invention relates to a high-voltage large-power frequency conversion adjustable constant voltage source which comprises a signal generator and N signal processing circuits, wherein power sources for inner components of any two signal processing circuits are not grounded; each signal processing circuit is composed of a digital isolation switching circuit and a power amplifier module; a signal generated by the signal generator is synchronously output to all the signal processing circuits; after the signal is firstly processed by the digital isolation switching circuits of all the signal processing circuit, N high-precision isolated low-voltage alternate current signals are output, wherein N is an integer which is not less than 1; all the low-voltage alternating current signals are the same in amplitude, frequency and phase, and the amplitude and frequency of all the low-voltage alternating current signal can be synchronously adjusted; and all the low-voltage alternating current signals are output to the corresponding power amplifier modules treatment be amplified; and output ends of N power amplifier modules are sequentially connected in series so as to be utilized as the total output of the constant voltage source. The constant voltage source provided by the invention has the advantages that the output voltage and power accuracy is high, and the amplitude regulating range is large.

A switching power supply apparatus includes a step-down converter that steps down an input current by turning on/off switching elements, a switching element electrically connected between the step-down converter and voltage outputs, and a microcontroller. An input-side resistor voltage dividing circuit and an output-side resistor voltage dividing circuit including elements with the same or similar specifications are electrically connected to the input and output of the switching element, respectively. The microcontroller stores coefficients of an expression which have been externally calculated according to a voltage detected by the output-side resistor voltage dividing circuit and a voltage detected at the voltage output portions. The microcontroller corrects a measurement value of an intermediate bus voltage detected by the input-side resistor voltage dividing circuit according to an expression and the stored coefficients.

The invention discloses a cooperative game based kinetic momentum optimizing managing method of a hybrid performing mechanism. The method comprises the following steps: designing a strategy target L and a limiting condition f; designing a gate metric function H; defining the relationship among a strategy combination, CMG frame angular velocity and the RW rotating angular velocity; performing fuzzyclustering to obtain a strategy space of a CMGRW hybrid performing mechanism; selecting an initial value of the strategy combination; designing the variation value of the strategy combination; and correspondingly optimizing the strategy combination; if H (d gamma) is not greater than 0, obtaining a new strategy combination; if the strategy combination is converged, obtaining the optimal strategycombination, or re-selecting the initial value of the strategy, and optimizing. According to the method, the cooperative game theory is adopted for the first time to design CMG and RW based hybrid performing mechanism control rule, so that the problem of RW saturation and abnormality of CMG can be avoided; and moreover, high torque can be accurately output, so that the flexible agile capability ofsatellite attitude can be improved; in addition, the angular momentum is managed and optimized, so that the purpose of optimizing energy can be achieved; and meanwhile, the energy consumption of thehybrid performing mechanism system can be decreased.

First and second diffraction grating layers are provided above a semiconductor substrate, and are spaced from each other in an output direction of a beam with a flat connecting layer sandwiched therebetween. An active layer is disposed above or below the first and second diffraction grating layers and the connecting layer. A cladding layer is disposed above the active layer or above the first and second diffraction grating layers and the connecting layer. A diffraction grating including the first and second diffraction grating layers has a plurality of slits penetrating from an upper surface to a lower surface that are perpendicular to the output direction of the beam. The connecting layer is formed from two layers grown epitaxially in a direction perpendicular to the output direction of the beam. One of the two layers is formed of the same material as the first and second diffraction grating layers.

The invention relates to the field of control circuits, in particular to a programmable closed-loop Sigma-Delta micro-accelerometer and a control system. The programmable closed-loop Sigma-Delta micro-accelerometer control system provided by the present invention forms a closed-loop loop by connecting the micro-acceleration sensor, the front-end detection circuit, the AD conversion circuit, the FPGA signal processing circuit and the control circuit end to end, and the sigma-delta modulation technology When applied to the control system, the signal-to-noise ratio and accuracy of the closed-loop micro-accelerometer are improved. At the same time, the control circuit composed of the sigma-delta modulator implemented by FPGA and DSP can be modified or redesigned at any time, which improves the flexibility of the entire system. The sigma-delta modulation technology is applied to the micro-accelerometer, which reduces the noise floor of the closed-loop micro-acceleration system and improves the signal-to-noise ratio. At the same time, it adopts a digital circuit processing method to reduce the error caused by the analog device, and can achieve high precision output.

The present invention provides an encoder capable of reducing the influence of the temperature characteristic of the magnetoresistive element on the compensation voltage. In the operation of the encoder, the compensation adjustment unit (94) sequentially records the compensation voltage and the temperature of the magneto-sensitive element in the storage unit (95). The compensation adjustment unit (94) calculates an approximate expression based on the data of the storage unit (95), thereby calculating the temperature characteristic of the compensation voltage. The compensation adjustment unit (94) calculates the compensation voltage immediately after the start of the start, starting from the detection result and the temperature characteristic of the temperature monitoring resistor film and the temperature calculation unit (93) when the encoder is started next time.

The invention discloses a self-calibration method and system for a two-shaft frame type pendulous accelerometer. The method includes: rotating two frames of the accelerometer to enable an eccentric pendulum of the accelerometer to be positioned at six positions respectively, and acquiring torque measurement values at the six positions; solving apparent accelerations of the base in three orthogonaldirections according to the torque measurement values at the six positions; according to the apparent accelerations, the torque measurement values and a gravitational acceleration, calculating to obtain calibrated inner frame shaft pendulosity and calibrated outer frame shaft pendulosity; calculating to obtain a constant disturbance torque according to the torque measurement values; feeding backthe calibrated inner and outer frame shaft pendulosity and the constant disturbance torque to an error model in an operating state of the accelerometer to perform compensation calculation to obtain X-axial and Y-axial apparent acceleration components of the base, so that accuracy in acceleration measurement is improved. Pendulosity changes and zero offset of the accelerometer can be effectively separated out, and long-term stability and precision in use of the accelerometer are improved.