153 results about "Temperature Compensator" patented technology

A drive circuit for a PRAM (phase-change random access memory) device includes a write driver that generates a set/reset current in response to a set/reset pulse. In addition, a temperature compensator controls a pulse width of the set/reset pulse in response to a peripheral temperature of the PRAM device. For example, the temperature compensator maintains the pulse width to be substantially constant irrespective of the peripheral temperature. In another example, the temperature compensator decreases the width for higher peripheral temperature.

A valve system including a number of shape memory alloy (“SMA”)-actuated valves for controlling the flow of fluids is disclosed as is a variety of types of SMA-actuated valves and methods of operation. In one embodiment, a valve system includes a housing having a substantially closed cavity as well as a second port for communicating a fluid. Further, the valve system includes a first SMA actuator configured to control the position of the first seal to vary fluid flow through the firs port, and a first temperature compensator for adjusting the position of the seal by an amount proportional to temperature. A second SMA-actuated valve, driven by either a unidirectional or a bidirectional SMA actuator, controls the position of the second seal to vary fluid flow through the second port, and a second temperature compensator for adjusting the position of the second seal by another amount proportional to temperature.

A reference current bias circuit includes a self-bias circuit configured to provide a bias current to an amplifier; a basic bandgap circuit coupled to inputs of the amplifier; a startup circuit configured to support an initial operation of the amplifier; a temperature compensator configured to include a first mirroring unit for mirroring current according to a positive temperature coefficient characteristic from the basic bandgap circuit; and a second mirroring unit for mirroring current according to a negative temperature coefficient characteristic from the basic bandgap circuit, and to provide a reference current by combining the current of the first mirroring unit and the current of the second mirroring unit; and a reference current mirroring unit configured to generate reference current biases based on the reference current from the temperature compensator.

The photoelectronic integrated acceleration geophone is one acceleration and seismic wave detector. Inside metal casing, there are photoelectronioc integrated acceleration geophone chip and laser. The chip consists of silicon substrate, buffering silica layer and integrated optical waveguide polarizer, M-Z waveguide interference instrument, interdigital photoacoustic transducer, photoelectronic detector, temperature compensator and demodulator circuit and signal processor circuit; and has simple harmonic vibrator comprising cross beam etched on the silicon substrate and silicon mass block. The present invention features the connection of the input of the M-Z waveguide interference instrument and the laser, the connection of the output and the photoelectronic detector, and the connection of the signal arm with planar waveguide and the photoacoustic transducer.

The invention discloses a temperature compensation method of an output torque of a permanent magnet synchronous motor for a vehicle based on a neural network. The method aims at the influence of temperature on stator resistance and a permanent magnetic flux linkage and comprises the following steps: building a neural network model for describing non-linear coupling action of the temperature on multiple parameters of a vehicle-mounted permanent magnet synchronous motor; and based on the built neural network model, designing a temperature compensator on the output torque, so that the motor can be effectively and continuously controlled and an ideal and smooth output torque is obtained. The method disclosed by the invention has the advantages that a temperature compensation control system is adopted, the controller regulates the control quantity according to different motor temperatures, and then real-time control is carried out on the motor, so that the smooth output torque is obtained, and the operation difficulty of a technician is lowered; and the voltage control quantity does not need to be adjusted according to an efficiency map in real time and can be adjusted in real time according to the continuous change of the temperature, so that the control precision is greatly improved.

Disclosed are an in-line monitoring apparatus with a temperature compensator, an optical receiver and a method for stabilizing gain of an avalanche photodiode (“APD”) over an extended range of input power values and across temperature variations. The apparatus can include one or more power monitoring stages coupled in parallel to the APD for generating one or more measurement signals in-situ. The apparatus also includes a temperature compensator configured to adjust an operational parameter for the APD as a function of temperature and the measurement signal. The temperature compensator adjusts the bias to maintain a substantially uniform gain across temperature variations to facilitate an increased sensitivity with which to monitor the input power at lower levels than if the temperature compensator did not adjust the bias in response to the temperature. One of the power monitoring stages can be configured to monitor the low-powered optical signals.

In various embodiments, the invention provides a frequency controller and a temperature compensator for frequency control and selection in a clock generator and/or a timing and frequency reference. The various apparatus embodiments include a resonator adapted to provide a first signal having a resonant frequency; an amplifier; a temperature compensator adapted to modify the resonant frequency in response to temperature; and a process variation compensator adapted to modify the resonant frequency in response to fabrication process variation. In addition, the various embodiments may also include a frequency divider adapted to divide the first signal having the resonant frequency into a plurality of second signals having a corresponding plurality of frequencies substantially equal to or lower than the resonant frequency; and a frequency selector adapted to provide an output signal from the plurality of second signals. The output signal may be provided in any of various forms, such as differential or single-ended, and substantially square-wave or sinusoidal.

The invention discloses an optical fiber temperature compensator of an electronic current transformer, the current transformer comprises a current measuring coil and an energy obtaining coil which are sleeved on a line to be measured; the current measuring coil is sequentially connected with an integral amplification module, an A/D (analogue/digital) conversion module and a first E/O (electric/optic) conversion module, the first E/O conversion module is connected with a first O/E conversion module through an optical fiber, and the first O/E conversion module is connected with a current operation module which is connected with a synchronous control module; the energy obtaining coil is connected with a suspension power supply, and the suspension power supply is connected with the integral amplification module, the A/D conversion module and the first E/O conversion module; a semiconductor laser is connected with a wavelength division multiplexer, the wavelength division multiplexer is connected with the optical fiber, and interfaces of two backward scattered light channels of the wavelength division multiplexer are respectively connected with a photoelectric converter and an amplification circuit and further connected with a high-speed data acquisition card; and the high-speed data acquisition card is connected with the current operation module. The optical fiber temperature compensator of the electronic current transformer can effectively measure the temperature and perform temperature compensation for the measured current values.

In various embodiments, the invention provides a clock generator and/or a timing and frequency reference, with multiple operating modes, such power conservation, clock, reference, and pulsed modes. The various apparatus embodiments include a resonator adapted to provide a first signal having a resonant frequency; an amplifier; a temperature compensator adapted to modify the resonant frequency in response to temperature; and a process variation compensator adapted to modify the resonant frequency in response to fabrication process variation. In addition, the various embodiments may also include a frequency divider adapted to divide the first signal having the resonant frequency into a plurality of second signals having a corresponding plurality of frequencies substantially equal to or lower than the resonant frequency; and a frequency selector adapted to provide an output signal from the plurality of second signals. The output signal may be provided in any of various forms, such as differential or single-ended, and substantially square-wave or sinusoidal.

The invention relates to a multi-point type weighing equipment and a manufacturing method of the same. The time and cost which requires the adjustment of a load cell in case of manufacturing the multi-point type weighing equipment using a plurality of load cells are fully reduced. Four strain gauges comprise a Wheatstone bridge circuit for every load cell, and it has composition that these were connected in parallel. When all the load cells are not loaded, in order to make small the variation of the load cell of the output voltage depending on temperature between CD in case of input voltage being applied between AB as much as possible, temperature compensator (182) which is the first resistance for adjustment is provided in the Wheatstone bridge circuit corresponding to load cell (10). Also, when all the load cells are not loaded, in order to make minimum the absolute value of the output voltage between CD in case of input voltage being applied between AB as much as possible, zero balance adjustment resistance (183), which is the second resistance for adjustment, is also provided in this Wheatstone bridge circuit.

A process for preparing zirconium tungstate (ZrW2O8) ceramics includes the reacting between the superfine Zr compound and W compound particles and sintering, and features that the powdered monocrystal of ZrW2O8 is used as the crystal seeds in said reaction for simplifying process, shortening period and lowering sinter temp and cost. A modified ZrW2O8 ceramics with regulated thermal expandability is prepared by generating the second phase in the ZrW2O8 ceramics and can be used for the temp compensator of fibre Bragg garting (FBG).

The invention belongs to a pressure sensing technique and relates to circuit design of a high-accuracy pressure transmitter. In combination with the transmission characteristics of a piezoresistive SOI (Silicon on Insulator) pressure-sensitive device and a differential amplification circuit at different temperature conditions, the compensation of the temperature error of the output signal of the pressure transmitter is realized through a precision resistor network. Commonly used temperature compensation devices such as thermistors and diodes are not needed to be used in the circuit of the high-accuracy pressure transmitter, the temperature compensation of the pressure transmitter is realized only through four groups of precision fixed resistors and the errors of the pressure transmitter are reduced; and the applicable temperature range of the pressure transmitter which is designed by using the circuit is negative 55 DEG C to 175 DEG C and the output errors within the full temperature range are smaller than plus or minus 0.5% FS. The high-accuracy pressure transmitter has the advantages of small size, light weight, strong interference-resistant capability, stable output and simple and convenient technological process, and is suitable for large-scale production.

The invention provides an outward-turning type coaxial cylinder viscometer of a hollow cylinder type optical fiber Bragg grating, comprising a torsion measurement grating, a temperature compensation grating, an elastic hollow cylinder, an L-shaped temperature compensator, a stator and a viscometer measuring system which is composed of a spectrum analyzer, an ASE light source, a coupler and an optical fiber; the inner wall of the elastic hollow cylinder is pasted with the torsion measurement grating and the L-shaped temperature compensator, a long side of the compensator is pasted with the temperature compensation grating. According to the measured value of torsion and temperature sensitivity difference of the torsion measurement grating and the temperature compensation grating, the compensation of torque measurement disturbed by temperature fluctuation is realized by adopting differential operation, so as to realize accurate measurement of the torque. One end of the optical fiber is respectively connected with the spectrum analyzer and the ASE light source by the coupler, the other end thereof is connected with the optical fiber Bragg grating; wideband laser emitted by the ASE light source enters into the optical fiber Bragg grating, viscosity number is directly read out by wavelength displacement operation through an embedded computer of the analyzer. The sensor is suitable for measuring the viscosity of various fluids.

The patent relates to electronic protector for car. A security device for preventing door from collision as it opens, consists of a Fresnel lens, an infrared detector, a pre-amplifying circuit, an A/D converter, a light compensator, a temperature compensator, a monolithic computer, a door switch, an manual unlocking unit a speech reminder, and interfaces between the security device and the door actuator of the car. When passenger want to get off the car the security device can lock the door and make an acoustic alarm, in music or in a speech while the protector finding an object running from side back. The manual unlocking unit can help passengers make up a decision to wait a moment or not.

The invention provides a full automatic mechanical electric refrigerator temperature controller, composed of power supply unit, executing unit, control unit, signal input unit, refrigerating chamber temperature sensor and refrigerate-evaporating temperature sensor. Its characteristic: the power supply unit converts the 220v AC electric supply to +12V and +5V DC power supplies, where the +12V power supply supplies the power to the executing unit; the +5V power supply supplies the power to the control unit and signal input unit, is converted to analogue voltage signal through the signal input unit and converted to digital signal through the control unit, and after analyzed and judged by the control unit, transfers to the executing unit to control the stop or delayed switching-on by starter for the compressor and the switching-on and -off of temperature compensator. It has simple structure, and the refrigerator temperature can automatically be regulated according to environmental temperature, remedying the defect that the existing refrigerator works in an unreasonable state because of temperature change.

The invention relates to a temperature compensator for a giant magneto-resistance effect current sensor, belonging to the technical field of electric power system measurement. A reversed-phase input terminal of an operational amplifier in the temperature compensator is connected with an positive electrode of a direct current voltage source; one terminal of a negative temperature coefficient thermistor is connected in series with one terminal of a first high precision low temperature coefficient resistance; the other terminal of the negative temperature coefficient thermistor is connected withthe in-phase input terminal of the operational amplifier; the other terminal of the first high precision low temperature coefficient resistance is earthed; a second high precision low temperature coefficient resistance is connected in parallel between the in-phase input terminal and output terminal of the operational amplifier; and the output terminal of the operational amplifier is connected with a power supply terminal of the giant magneto-resistance effect current sensor. According to the invention, the temperature compensator p has the advantages of low cost and good stability and the like and is suitable for applying to the temperature compensation of the giant magneto-resistance effect current sensor; the precision of the giant magneto-resistance effect current sensor is greatly increased; moreover, a circuit with a simple structure, low cost and stable performance is used so that the compensation effect is very obvious.

The invention discloses a thermocouple cold junction compensation and temperature measurement circuit and device. The thermocouple cold junction compensation and temperature measurement circuit comprises a temperature sensor and an electronic controller, wherein the temperature sensor is used for acquiring the environmental temperature; the electronic controller comprises a cold junction temperature compensator and a pair of binding posts connected with the cold junction temperature compensator, and the cold junction temperature compensator is connected with the temperature sensor and used for performing temperature compensation on a cold junction of a thermocouple according to the environmental temperature acquired by the temperature sensor; the cold junction temperature compensator is connected with the cold junction of the thermocouple through the pair of binding posts and a group of compensation leads, the materials of the pair of binding posts and the group of compensation leads are the same with that of a thermode of the thermocouple, and the cold junction temperature compensator is mounted close to the pair of binding posts. Precise measurement of the temperature of the cold junction temperature compensator and a pair of binding posts thermocouple is realized through organic integration of the compensation leads and the temperature sensor, meanwhile, longer-distance reliable transmission of mV-level temperature signals in an auxiliary power unit system is guaranteed, and the precision and reliability of the temperature signals are improved.

A piezoelectric actuator, e.g., for actuating a mechanical component, is proposed, in which a piezoelectric element (<HIL><PDAT>2</BOLD><PDAT>) for acting on an actuating element (<HIL><PDAT>9</BOLD><PDAT>) with a pulling or pushing force, and a compensating element (<HIL><PDAT>3; 20</BOLD><PDAT>) are provided, wherein the piezoelectric element (<HIL><PDAT>2</BOLD><PDAT>) and the compensating element (<HIL><PDAT>3; 20</BOLD><PDAT>) basically have the same temperature expansion coefficients. The compensating element (<HIL><PDAT>3; 20</BOLD><PDAT>) is mechanically coupled to the piezoelectric element (<HIL><PDAT>2</BOLD><PDAT>) in such a fashion that the temperature-induced expansions of the piezoelectric element (<HIL><PDAT>2</BOLD><PDAT>) and the compensating element (<HIL><PDAT>3; 20</BOLD><PDAT>) cancel each other out in the effective direction in such a fashion that the actuating element (<HIL><PDAT>9</BOLD><PDAT>) remains in its position. A heat transfer compound (<HIL><PDAT>12</BOLD><PDAT>) is located between the piezoelectric element (<HIL><PDAT>2; 21</BOLD><PDAT>) and the compensating element (<HIL><PDAT>3; 22</BOLD><PDAT>).</PTEXT>

A multi-stage voltage regulating circuit and method with automatic temperature compensation comprises a plurality of charge-pumps, a temperature compensator, a comparative unit and a control logic circuit; wherein, the temperature compensator detects the ambient temperature and outputs a reference voltage related to the ambient temperature, the comparative unit compares the voltage of the output power source to the reference voltage output by the temperature compensator and outputs a comparative signal based on the comparison, and the control logic circuit controls the charging/discharging operations of the charge-pumps based on the comparative signal and voltages of input power sources connected to said charge-pumps to automatically regulate the voltage of the output power source.