261 results about "Dc drive" patented technology

The present invention discloses an energy-saving thermal comfort controller and a control method for heating, ventilating and air-conditioning systems based on thermal comfort index, energy-saving control and neural network arithmetic. Wherein, the controller calculates and displays thermal comfort index based on air temperature, humidity, wind speed, radioactive temperature and user activity details and wearing details. The air temperature and humidity are measured by a sensor. The radioactive temperature is equivalent to the air temperature. The wind speed is obtained by calculating input power of a fan. User activity details and wearing details are defined by users themselves or conform to default values. The energy-saving control method divides heating, ventilating and air-conditioning system into three operating phases, viz. quick refrigerating/heating, comfortable operation and energy-saving operation and provides corresponding set comfort index. In addition, the neural network arithmetic conducts calculation and outputs control signals according to difference between set comfort index and actual index to control the heating, ventilating and air-conditioning system respectively through a AC and a DC drive circuit, thus realizing the highest comfort and the lower energy consumption.

An LCD monitor having a partitioned circuit section is adapted to prevent a failure or malfunction caused by heat generated by the circuit section, and includes: an interface board receptive to video and sync signals generated by a computer; a main printed circuit board (PCB) for processing the video and sync signals received from the interface board, and for displaying the video signals on a liquid crystal panel; a power PCB for rectifying an AC into DC to supply a DC drive voltage to the main PCB and an audio PCB, the power PCB being disposed apart from the main PCB by a specified distance to prevent heat generated in the DC supply from causing a failure or malfunction of components in the main PCB; and an invertor PCB for converting the DC supplied by the power PCB to alternating current (AC), the power PCB separated from the main PCB being disposed on the side of an invertor section in the liquid crystal panel.

An apparatus for electronically controlling a quadrupole in a mass spectrometer, comprises radio frequency (RF) drive circuitry and direct current (DC) drive circuitry coupled to a quadrupole, an RF control loop associated with the RF drive circuitry, a DC control loop associated with the DC drive circuitry, and control loop circuitry associated with the DC control loop, the control loop circuitry configured to alter a response of the DC control loop during a settling time period of a step response such that ion transmission through the quadrupole is greater during the settling time than if the response of the DC control loop during the settling time is unaltered.

The invention relates to an intelligent control system of an electric wheel chair, comprising an ARM (Automated Route Management) master control module, an operating handle, an electronic compass, a remote wireless communication module, a distance measuring module group, a DSP (Digital Signal Processing) motor control module and a motor driving module, wherein the ARM master control module is connected with the electronic compass, the distance measuring module group and the DSP motor control module through a CAN (Controller Area Network) bus to form a one-to-many CAN network; as node equipment independent from the ARM master control module, the operating handle is accessed to the one-to-many CAN network; the DSP motor control module is connected with DC driving motors through the motor driving module; and each DC driving motor is provided with a photoelectric encoder and forms motor rotating speed closed-loop control. The invention realizes the intelligentized control function of the electric wheel chair and ensures the instantaneity, the extendibility and the portability of the intelligent control system by adopting an embedded type system and modular design and has rich functions, flexible control, convenient use, and the like.

The invention discloses a complex pipeline moving rat which solves the problem that a moving device in a pipeline can not effectively pass through a complex pipeline and climb a vertical pipeline. The complex pipeline moving rat comprises a retainer and a driving body which are assembled in a pipe wall and is technically characterized in that the retainer and the driving body are assembled on a same main shaft; two motor driving bodies of the driving body are respectively symmetrically hinged between a connecting base of the main shaft and a slide block of the driving body through a link mechanism so that a driving wheel is tensioned in the pipe wall; the motor driving bodies are provided with a DC driving motor and a DC steering motor; and a four-bar mechanism of the retainer, which is provided with a supporting wheel, is hinged between the connecting base of the main shaft and the slide block of the retainer so that the supporting wheel is tensioned in the pipe wall. The invention has reasonable structural design, easy operation, flexible work, stability and reliability, not only can meet the requirement of round pipeline reducing, but also can move in a square pipeline and can climb the vertical pipeline, thereby achieving the aim of moving a self-adaptive pipeline which is compositely driven in complex pipelines, such as a T type pipeline, an L type pipeline or U type pipeline, and the like.

An electric full-circle rotation inboard and outboard (double-motor) contra-rotating propeller propulsion unit is applicable to various small and medium-sized ships and boats, an energy conservation value is increased by 10% to 12%, and navigational speed and propulsion efficiency are improved by about 10%. The electric full-circle rotation inboard and outboard (double-motor) contra-rotating propeller propulsion unit comprises encoders, servo motors, speed reducers and large and small cylindrical gears, a rotary support and a sleeve are connected with a lower box to realize full-circle rotation, a ship can turn around flexibly, the reversing speed of the ship is increased by 1.6 times, and the ship runs safely. Optimal three-dimensional movement efficiency of contra-rotating propellers is realized by the aid of a hydraulic lifting mode or an electric lifting mode. A propulsion unit support is connected with a hull, propulsion force, vibration and impact force are absorbed, and the unit is protected. The front and the back of the lower box are streamline-shaped, the upper section of the lower box is wing-shaped, accordingly resistance is reduced, and the lower box is novel and compact in structure, small in dimension and light in weight. In addition, alternating-current frequency converters or direct-current drivers, a PLC (programmable logic controller) single cable connected with a driving cab liquid crystal display, double-motor double-propeller controllers, full-circle steering wheels and direction indicators are adopted, and double-motor full-circle synchronous electronic omnidistance operation is realized. The electric full-circle rotation inboard and outboard (double-motor) contra-rotating propeller propulsion unit is powered by batteries and emergency generator sets or in a hybrid mode, and zero or low-carbon emission is realized.

A kneading massager has a speed reduction gear unit in mesh with the output shaft of a DC driving motor to input the mechanical power of the motor, the speed reduction gear unit has several output shafts to engage with a tapered massage block thereby making the massage block to perform tender and comfortable kneading motion like human fingers when being driven by the Dc motor.

The invention provides a DC driving voltage regulation device and method, a power supply device and a display panel. The DC driving voltage regulation device and method are characterized in that DC driving voltage is transmitted to an effective display area by a DC voltage generating unit through a lead that is arranged outside the effective display area of the display panel; the DC driving voltage regulation unit comprises a current acquiring unit for acquiring current from lead on real time, and a voltage regulating unit for regulating DC voltage generated by the DC voltage generating unit or regulating the resistance of the lead according to the current in order to keep the DC driving voltage unchanging. With the adoption of the DC driving voltage regulation device and method, the power supply device and the display panel, the effective display area is given with unified DC driving voltage, and thus the display uniformity of the display panel is ensured.

The invention proposes a method for etalon suppression in a gas detection device by determining an etalon fringe period during a calibration step without gas in dependency of the DC drive current. A measuring signal which is a function of the gas absorption and substantially independent of an intensity modulation of an initial light signal at an initial frequency (f) is generated by determining a first pre-measuring signal when the laser source is operated at the center of the gas absorption peak, a second pre-measuring signal when the laser source is operated with a DC drive current below the gas absorption peak of the gas to be detected, and a third pre-measuring signal when the laser source is operated with a DC drive current above said gas absorption peak, with a difference between said DC drive currents which corresponds to the etalon fringe period determined in a calibration step before. The final measuring signal is determined as the difference between the first pre-measuring signal and the arithmetic mean of the second pre-measuring signal and the third pre-measuring signal. This etalon fringe suppression allows to implement a substantial simplification of a reference channel in a gas detector, which does not require separate lock-in channels which analyse the detector signal either on the modulation frequency (f), or on twice the modulation frequency (2f).

The invention discloses a heterodyne-converter system based on public DC bus technology for boat and is characterized in that: a plurality of frequency changers are connected with respective public DC bus and is connected with the main three phase power source inside the boat through a public ratifying device. The public rectifying device finishes the transforming from the main three phase power source to public DC power source and provides DC power for each frequency changer through the public DC bus, each frequency changer drives respective non-synchronous motor. The heterodyne-converter system for boat needs only a group of public input wave filter device, a group of public three phase rectifying device, a group of public overpressure chopped wave unit and a group of public insulating inspection device to supply reliable work insurance for the posterior pole system made of heterodyneconverter system. The invention greatly increases the work reliability of the whole system and is mainly applied in the DC drive frequency changing system of boat for heterodyne-converter drive of the windlass load, blower load and pump load.

The invention discloses a piezoelectric linear motor fused with a shear piezoelectric actuator composite drive mode and a preparation method thereof. The piezoelectric linear motor comprises a piezoelectric harmonic oscillation piezoelectric transducer, a shear piezoelectric actuator, a drive circuit, a slider, a friction head fixed to the shear piezoelectric actuator, and peripheral parts. The harmonic oscillation piezoelectric transducer and the shear piezoelectric actuator are tightly bonded together to form a composite piezoelectric drive stator. The friction head and the slider in a sliding assembly are in close contact. The harmonic oscillation piezoelectric transducer and the shear piezoelectric actuator are provided with an upper surface electrode and a lower surface electrode. The piezoelectric motor can be driven in a harmonic, direct-current or composite mode, can produce macroscopic continuous linear motion and sub-micron and nanometer motion, and can produce big driving force. The piezoelectric linear motor of the invention is simple in structure and convenient to make, and can be popularized and applied in the field of precision driving.

There is provided a multi-stage power supply. A multi-stage power supply according to an aspect of the invention may include: a voltage converter circuit section including a plurality of first to n-th DC/DC converters connected in series between an input terminal and an output terminal, in order to supply a DC driving voltage to an LED array having a plurality of LEDs therein; a voltage detection section detecting an output voltage from the voltage converter circuit section; and a PWM control section generating a PWM control signal on the basis of a first detection voltage from the voltage detection section, a second detection voltage obtained by detecting current flowing through the LED array, and a third detection voltage obtained by detecting a current waveform flowing through an internal switch of the n-th DC/DC converter, and supplying the PWM control signal to each of the first through n-th DC/DC converters.

The invention discloses a self-adaptive EGR valve control system, and relates to an exhaust gas recirculation (EGR) valve control system, which comprises a DC driving motor, a position feedback module, a diagnostic module and an adjustment control module. The DC driving motor is controlled by the position feedback module to realize positive and reverse rotation and positioning so as to control the lift of the EGR valve to adjust the size of the EGR rate. The position feedback module monitors the lift of the EGR valve so as to accurately adjust the size of the EGR rate. The diagnostic module is used for determining whether the EGR valve can work normally so as to serve as the basis for the adjustment control and the premise for the self-adaptability. The adjustment control module integrates the control software and the control strategy of the control system so as to diagnose the system error and adjust the size of the EGR rate.

In at least one embodiment of the disclosure, a discharge lamp lighting device comprises a discharge lamp driving section and a control unit. The control unit alternately performs a first DC driving processing and a first AC driving processing in a first portion of the driving current. The control unit alternately performs a second DC driving processing and a second AC driving processing in a second portion of the driving current different from the first portion. The control unit performs the first AC driving processing and the second AC driving processing such that a frequency of a first alternating current and a frequency of a second alternating current have different values.

The invention discloses a daylight lamp constant current driving method which comprises the following steps: 1) setting an alternating current input end for inputting an alternating current drive power, thus alternating current is accessed; 2) setting a direct current output end for outputting a direct current drive power, thus driving of a daylight lamp is realized; and 3) setting a constant current drive control circuit for converting the accessed alternating current drive power into the direct current drive power and outputting a constant current and voltage to realize the action of the constant current driving daylight lamp, wherein one end of the constant current drive control circuit is connected with the alternating current input end, and the other end of the constant current drive control circuit is connected with the direct current output end. The invention also discloses a driving circuit for implementing the daylight lamp constant current driving method; the method provided by the invention not only can improve the utilization efficiency of electric energy, but also can ensure stability of current voltage of the drive power; and the production cost is low, and the safety performance is high; the driving circuit provided by the invention has the advantages of reasonable layout, small volume, high conversion efficiency and obvious stability of current voltage output and energy conservation effect.

The invention discloses a method for prolonging service life of OLED light-emitting devices through AC driving. The method comprises the steps that: six OLED light-emitting devices are connected into a DC driving circuit and an AC driving circuit, under DC driving, the OLED light-emitting devices are always in a working state, the produced heat cannot be dissipated effectively; and under AC driving, whether it is sinusoidal wave, square wave or impulse wave with 30% positive duty ratio, the waves operate along with the alternation of periods, thus heat production time is shortened, heat dissipation is facilitated, the temperature of the devices is relatively low, organic light-emitting materials can be effectively protected, the aging of the materials can be slowed down, the service life can be prolonged, and the cost can be reduced. The AC driving circuit is more suitable in the mains supply application occasions with the frequency of 50Hz when compared with the DC driving circuit, does not need to be added with other circuits for carrying out energy conversion links such as rectification, voltage transformation and current transformation, and reduces electric energy loss.

An illumination optical system is disclosed, which provides a luminous flux with a small incident angle on an illumination surface in one axis direction on a section of the luminous flux. The illumination optical system can suppress a reduction in light amount by a mask provided for a polarization conversion element. The illumination optical system has a light source and an optical integrator. The optical integrator uses a lens array to perform splitting of a luminous flux from the light source. The illumination optical system has the polarization conversion element including a polarization beam splitter array, a plurality of ½ wave plates, and a mask. The light source is a discharge gas exciting arc tube of a DC drive type.