113results about How to "Improve output linearity" patented technology

The invention discloses a low dropout regulator, which comprises an error amplifier, a buffer circuit, a P-channel metal oxide semiconductor (PMOS) regulation transistor, an N-channel metal oxide semiconductor (NMOS) push-pull tube, a voltage division feedback circuit, a compensation circuit and an output circuit, wherein the gate of the PMOS regulation transistor is connected with the output end of the buffer circuit, the source of the PMOS regulation transistor is connected with power voltage, and the drain of the PMOS regulation transistor is used as the output end of the low dropout regulator; the gate of the NMOS push-pull tube is connected with the output end of the error amplifier, the drain of the NMOS push-pull tube is connected with the drain of the PMOS regulation transistor, and the source of the NMOS push-pull tube is grounded; and the error amplifier, the compensation circuit, the buffer circuit, the PMOS regulation transistor, the voltage division feedback circuit and an output circuit form a main control loop, and the error amplifier, the compensation circuit, the NMOS push-pull tube, the voltage division feedback circuit and the output circuit form an auxiliary control loop. According to the low dropout regulator, the transient response of the regulator can be quickened, and the accuracy of output voltage can be improved.

Impedance-matched output driver circuits include a first totem pole driver stage and a second totem pole driver stage. The first totem pole driver stage includes at least one PMOS pull-up transistor and at least one NMOS pull-down transistor therein that are responsive to a first pull-up signal and a first pull-down signal, respectively. The second totem pole driver stage has at least one NMOS pull-up transistor and at least one PMOS pull-down transistor therein that are responsive to a second pull-up signal and second pull-down signal, respectively. The linearity of the output driver circuit is enhanced by including a first resistive element that extends between the first and second totem pole driver stages. The first resistive element has a first terminal, which is electrically coupled to drain terminals of the at least one PMOS pull-up transistor and the at least one NMOS pull-down transistor in the first totem pole driver stage, and a second terminal, which is electrically coupled to source terminals of the at least one NMOS pull-up transistor and the at least one PMOS pull-down transistor in the second totem pole driver stage.

A method for enhancing the linearity of a differential capacitive sensor as a function of beam displacement. An ac-modulated feedback connection from a sensor output terminal to a movable beam electrode is provided through a fix-up capacitor. The output terminal signal is inverted in the feedback connection so that the fix-up capacitor reduces the capacitance from the fixed electrodes to the beam electrode. When the fix-up capacitor value is chosen approximately equal to the fixed capacitance of the differential capacitor, the feedback circuit compensates for the effect of this fixed capacitance. The linearity of the output as a function of the displacement of the beam is improved. Thus, the signal-to-noise ratio of devices such as accelerometers may be increased by allowing sensors to employ a large displacement range. The invention may be used in differential accelerometers and in other types of differential capacitive sensors.

A dynamic quantity sensor includes a force receiving portion, a first movable portion that rotates in a first rotational direction around a first rotational axis according to dynamic quantity in a first direction that the force receiving portion receives, and rotates in the first rotational direction around the first rotational axis according to dynamic quantity in a second direction different from the first direction that the force receiving portion receives; and a second movable portion that rotates in a second rotational direction around a second rotational axis according to the dynamic quantity in the first direction that the force receiving portion receives, and rotates in an opposite direction to the second rotational direction around the second rotational axis according to the dynamic quantity in the second direction that the force receiving portion receives.

A physical quantity sensor detects physical quantity. The sensor includes a plurality of springs, which have different spring constants, respectively. The sensor has a wide detection range of the physical quantity without assembling multiple sensors. Therefore, the sensor can be minimized. Further, since the sensor has an excellent linearity of the output characteristics, the sensor has a wide dynamic range and a high sensitivity.

A rotation angle detecting device includes a magnet (4), a magnetic substance unit (5), and a non-contact magnetic detection element (7). The magnet (4) rotates with an object to be measured and includes two ends magnetized so as to have opposite polarities. The magnetic substance unit (5) forms a predetermined air gap with the two ends of the magnet (4) and is divided into magnetic members (6) so as to provide plane symmetry with respect to a vertical plane perpendicularly crossing a rotational center axis of the magnet (4) to form a magnetic detection gap (9) by the division. The non-contact magnetic detection element (7) is provided in the magnetic detection gap (9) between the magnetic members (6) so as to output a signal corresponding to a density of a magnetic flux passing through the magnetic detection gap (9). The rotation angle of the object to be measured is detected based on the output signal from the magnetic detection element (7). The magnetic members (6) include reverse warp parts (34) so that the air gap suddenly increases when the magnet (4) rotates at a predetermined rotation angle from a state where the air gap is minimum in a direction in which the air gap increases.

A torque angle sensor according to an exemplary embodiment of the present disclosure includes a torque sensor unit and an angle sensor unit at a housing centrally arranged with a rotation shaft, the torque sensor unit including a stator installed inside the housing, a torque magnet rotatably installed at a center of the stator in conjunction with rotary operation of the rotation shaft, a collector installed at the housing to transmit a magnetic field of the torque magnet, a magnetic device module formed with an individually operating first magnetic device and a second magnetic device in one package to detect the magnetic field transmitted by the collector, and a PCB (Printed Circuit Board) mounted with the magnetic device module, wherein the PCB is arranged to a direction perpendicular to an axial direction of the rotation shaft and installed at a distal end with the magnetic device module.

A piezoelectric sound sensitive transducer consists of pickup head for picking sound signal up, insulation base and its press plate for placing piezoelectric element with base electrode at middle and for insulating piezoelectric element to pickup head and base electrode, piezoelectric element for picking up sound signal and for converting it to be output electric signal, electrode lead out wire for transmitting said signal to wire fixing plate and transducer output wire for outputting electric signal .

A rotation angle detecting device includes a magnet (4), a magnetic substance unit (5), and a non-contact magnetic detection element (7). The magnet (4) rotates with an object to be measured and includes two ends magnetized so as to have opposite polarities. The magnetic substance unit (5) forms a predetermined air gap with the two ends of the magnet (4) and is divided into magnetic members (6) so as to provide plane symmetry with respect to a vertical plane perpendicularly crossing a rotational center axis of the magnet (4) to form a magnetic detection gap (9) by the division. The non-contact magnetic detection element (7) is provided in the magnetic detection gap (9) between the magnetic members (6) so as to output a signal corresponding to a density of a magnetic flux passing through the magnetic detection gap (9). The rotation angle of the object to be measured is detected based on the output signal from the magnetic detection element (7). The magnetic members (6) include reverse warp parts (34) so that the air gap suddenly increases when the magnet (4) rotates at a predetermined rotation angle from a state where the air gap is minimum in a direction in which the air gap increases.

Position sensor circuits are disclosed for use with variable reluctance sensors. Variable reluctance sensors are described for linear, angular and rotary position measurement and for acceleration measurement.

A magnetic sensor for detecting a component of an external magnetic field in a specific direction includes a resistor array including a plurality of resistive element sections each having a magnetoresistance element. Each of the plurality of resistive element sections has a different output characteristic curve with respect to the component of the external magnetic field in the specific direction.

The invention discloses an electromagnetic valve driving circuit of an electronic unit pump and a control method thereof, and belongs to the technical field of engine electronic control. The driving circuit comprises a power source, a DC / DC boosting module, a MOS tube QA, a high-end driving chip, a diode DA, a MOS tube QB, a low-end driving chip, an electromagnetic valve, a diode DB, a hall current sensor and a single chip; the MOS tube QA is controlled under a high-end control signal output by the PWM module of the single chip, and matched with a current feedback signal output by the single chip PWM module, so as to modulate the circuit driving voltage; the MOS tube QB is controlled by a low-end control signal output by the single chip PWM module, so as to control the circuit on-off, set up a follow current loop and realize rapid flow discharge. The driving circuit applies the hall current sensor, and has the advantages of few response times, small temperature drift, good output linearity and high durability, and others; the driving circuit matched control method can reduce the on-off frequency of the MOS tube QA, and reduce the circuit working noise.

The invention relates to a temperature compensation method of a silicon piezoresistive pressure transmitter. The method comprises the steps that firstly, a high-order temperature compensation relational expression of the pressure of the silicon piezoresistive pressure transmitter is established; afterwards, the silicon piezoresistive pressure transmitter is placed into a thermotank, m temperature points are evenly selected within the temperature range of the pressure transmitter, and pressure measurement values, within the pressure range, of the silicon piezoresistive pressure transmitter under n standard pressure are collected at all the temperature points; next, according to m temperature values, the n standard pressure and the m*n pressure measurement values, the temperature compensation coefficients of the pressure of the silicon piezoresistive pressure transmitter are obtained through calculation based on the least-squares regression algorithm, and the temperature compensation coefficients are stored in a storage unit of the pressure transmitter so that temperature compensation for the silicon piezoresistive pressure transmitter can be achieved. By the adoption of the method, the output linearity and the accuracy of the pressure transmitter can be improved, and the stability and the reliability of the pressure transmitter within the full temperature range are improved; besides, through the method, internal storage occupancy is small, and the operation speed is high.

The invention provides a macromolecule resistance humidity sensor and a relative production, wherein the macromolecule resistance humidity sensor comprise a porous ceramic base which upper and lower surfaces are respectively distributed with upper and lower surface electrodes, the surface electrodes are connected with lead wires, the holes on the porous ceramic base are immerged with humidity-sensitive medium, to form a solid humidity sensitive membrane. The inventive macromolecule resistance humidity sensor has simple and reliable production, low cost, non special device demand, batch production application, high output linearity, little humidity hysteresis return difference, high temperature resistance, high consistence, high stability for long time and better chemical gas resistance.

A dynamic quantity sensor includes a force receiving portion, a first movable portion that rotates in a first rotational direction around a first rotational axis according to dynamic quantity in a first direction that the force receiving portion receives, and rotates in the first rotational direction around the first rotational axis according to dynamic quantity in a second direction different from the first direction that the force receiving portion receives; and a second movable portion that rotates in a second rotational direction around a second rotational axis according to the dynamic quantity in the first direction that the force receiving portion receives, and rotates in an opposite direction to the second rotational direction around the second rotational axis according to the dynamic quantity in the second direction that the force receiving portion receives.

A method for controlling operation of a resonant converter is to be implemented by a control module that generates a drive signal for controlling a power switch of the resonant converter to thereby control an output voltage and an output current provided by the resonant converter to a load. The method includes: (A) configuring the control module to determine if the load is operating in a first mode or a second mode; (B) configuring the control module to generate the drive signal according to the output voltage when the control module determines that the load is operating in the first mode; and (C) configuring the control module to generate the drive signal according to the output current when the control module determines that the load is operating in the second mode.

A thermal flow rate sensor is provided which includes a main flow path through which a fluid flows, and a sensor flow path that branches off from the main flow path so as to cause the fluid to flow in a split flow and that is provided with a flow rate detecting mechanism configured to detect a flow rate of the fluid. The flow rate detecting mechanism includes an upstream-side coil and a downstream-side coil, each configured by using a heat-generating resistance wire wound around a sensor flow pipe forming the sensor flow path. A peak position of a temperature distribution generated in the sensor flow path by the upstream-side coil and the downstream-side coil is positioned on the upstream-side coil side relative to the middle position between the upstream-side coil and the downstream-side coil on the sensor flow path.

The invention belongs to the technical field of flowmeters and discloses a permanent-magnetic liquid metal flowmeter which comprises a primary sensor, a secondary instrument and a correlation method flow measuring device. The primary sensor comprises a magnetic system measuring part, a temperature measuring part, a supporting and positioning component and a protecting part, the magnetic system measuring part is the core of the primary sensor and is formed by serially connecting multiple magnetic steel components which are connected by a pair of magnetic poles to form a closed magnetic circuit which provides a stable magnetic field to the permanent-magnetic liquid metal flowmeter, the magnetic system measuring part further comprises electrodes and a pipeline component, and axis of the pipeline component, axes of the electrodes and a magnetic line are perpendicular to one another. The permanent-magnetic liquid metal flowmeter is of a tandem split structure, and has the advantages of being supportive of online calibration, high in measuring linearity, few in measuring error and suitable for wide measuring range.

The invention provides a high-precision differential type diaphragm optical fiber pressure sensing system. The high-precision differential type diaphragm optical fiber pressure sensing system comprises a puncture needle and a sensing probe, and further comprises an elastic diaphragm, wherein the puncture needle consists of a needle shell and a hollow needle cavity, the sensing probe is arranged inthe needle cavity, and the elastic diaphragm is nested in the inner wall of the needle shell and is arranged at the front end of the sensing probe; a needle tip is arranged at the front end of the puncture needle; the sensing probe and the elastic diaphragm are integrated in the part, close to the needle tip, of the needle cavity; the sensing probe comprises three sets of first optical fiber pressure sensors and a second optical fiber pressure sensor, wherein the first optical fiber pressure sensors are distributed in an annular array mode by taking the axis of the needle cavity as the center, and the second optical fiber pressure sensor is arranged on the axis line of the needle cavity; and the optical fiber pressure sensors performs differential type output with one input and two outputs. According to the high-precision differential type diaphragm optical fiber pressure sensing system, the measurement precision of the micro-strain force can be improved, the micro strain of the forcefrom the transverse direction and the axial direction can be sensed, particularly, the second optical fiber pressure sensor arranged on the axis line of the needle cavity can effectively improve theaxial strain precision, the interaction force sense information between the puncture needle and soft tissues can be enhanced, and therefore accurate control can be realized, and the safety of the operation can be improved.

The invention provides a wearable rehabilitation state monitor in order to improve rehabilitation training signal processing precision and reduce noise mixed in signals. The monitor comprises a flexible band, a rehabilitation information detection device, a communication unit and a remote rehabilitation information monitoring server. The rehabilitation information detection device and the communication unit can be fixed to a to-be-monitored person in a wearable mode by means of the flexible band. By means of the monitor, aliasing and interference of excitation signals on electromyography signals can be avoided, the defect that existing rehabilitation training conditions are mainly manually judged is greatly overcome, and a remote rescue center can know in time and quickly respond to the situations where rescue is needed when rehabilitation training people are at home or on other occasions where on-site monitoring is unavailable.

An angle detection apparatus comprising a magnet rotor having a multi-pole segment magnet, and a magnetic sensor for detecting the direction of a magnetic flux generated from the multi-pole segment magnet; the multi-pole segment magnet having pluralities of magnetic poles along the rotation direction of the magnet rotor, the magnetic sensor comprising a magnetosensitive plane having pluralities of spin-valve, giant-magnetoresistive devices each having a pinned layer having a fixed magnetization direction and a free layer having a magnetization direction rotating in response to the magnetic flux direction; and the magnetic sensor being positioned relative to the magnet rotor, such that the magnetosensitive plane crosses the magnetic flux, with perpendicular magnetic flux density components having different amplitudes on the magnetosensitive plane.

The invention is a device for on-line monitoring the water content of the SF6 gas of high voltage switching electrical appliance, characterized in mainly comprising power supply module, three signal process amplifying circuits, multi-channel switch, MCU, communication switching circuit, and three temperature sensors, three pressure transducers and three humidity sensors for measuring for three SF6 gas rooms in A-B-C three-phase separately-acting high voltage switch, etc. The device has the following advantages: 1. it can realize on-line and remote monitoring; 2. every sensor has good output linearity and the humidity accuracy is above twice higher than the national standard; 3. it is applied to high frequency electric field and outdoor environments; 4. it largely reduce the effluence of SF6 gas, thus assuring the health of operating personnel and reducing environmental pollution, and having completely important significance.

Magnetostrictive rod is installed on small boss at center of base. Phase change temperature control device is outside the magnetostrictive rod. Drive coil and bias winding on winding framework are setup outside of phase change temperature control device. Combination prepress mechanism composed of case, output push rod, prepress spring, upper cover and prepress nut are configured outside the bias winding. Input current inputting to magnetostrictive rod generates magnetic field drive. Controlling input current can control output displacement and output force of the actuator. Optimal operating condition can be adjusted through pre-stressing and biased magnetic field strength. Phase change temperature control device is added in order to guarantee displacement precision outputted from actuator. Features are lightweight, large output force, high precision.

A force detection device includes: a substrate; and a force transmission block. The substrate includes: a mesa gauge arranged on a principal plane of the substrate and providing a bridge circuit; a connection region arranged on the principal plane; and a sealing portion surrounding all around the mesa gauge and connected to the force transmission block. The mesa gauge includes: a first mesa gauge extending in a first direction; and a second mesa gauge extending in a second direction and spaced apart from the first mesa gauge. The connection region electrically connects the one end of the first mesa gauge and the one end of the second mesa gauge.

The invention relates to an orthogonal configuration six-degree-of-freedom vibration simulation system and method of a full-vertical actuator. The system comprises an upper platform assembly, eight actuator branches, a lower platform and a real-time control hardware system, wherein the upper platform assembly and the lower platform are connected through eight actuator branches in an orthogonal configuration of a full-vertical actuator; each actuator branch is composed of a moving magnet type motor actuator, a hinge assembly and other adapters; the real-time control hardware system obtains a six-degree-of-freedom acceleration signal of the upper platform assembly collected by the sensor through A / D sampling, and calculates a control signal; a control signal is outputted to the power amplifier through the D / A to drive the actuator to move, and the actuating force of the actuator is transmitted to the upper platform assembly to enable the upper platform assembly to generate an expected vibration effect. The system is advantaged in that multi-degree-of-freedom vibration excitation in complex environments such as satellite-borne, missile-borne, airborne, ship-borne or vehicle-mounted environments is provided, and the multi-degree-of-freedom vibration excitation is used for checking the stability level and control precision of the multi-degree-of-freedom vibration excitation in the complex vibration environments or testing and calibrating the functional performance of the multi-degree-of-freedom vibration excitation.

An optical fiber sensor in which the insertion efficiency of a plastic fiber is improved, the potential danger of rupture of a mold member is decreased, the operation of the sensor in a low load area and the linearity of output of the sensor are improved. Plastic fiber for detection is inserted in insertion hole of molded member, and filler is filled in a gap between the plastic fiber for detection and the molded member.

The invention discloses an envelope tracking power amplifier structure having an automatic alignment function. The envelope tracking power amplifier structure is formed in a manner that an input signal envelope detector, an envelope generation module and an automatic time-delay alignment module which are connected sequentially are added to an envelope tracking power amplifier, so that the envelope tracking power amplifier structure forms a feed-forward path. The automatic time-delay alignment module comprises a phase-locked loop circuit and a variable bandwidth filter, and is used for correcting the time-delay of the feed-forward path. According to the invention, the envelope tracking power amplifier can be achieved in a single chip and without base band supports, so that the complexity of a radio frequency emission link is greatly reduced, and the reliability is improved.