102results about How to "Reduce input current" patented technology

The invention provides a free piston engine, which comprises a cylinder block, a compression accumulator, a pump station and a piston assembly, and also comprises a first proportional overflow valve, a proportional pressure reducing valve, a proportional velocity regulating valve and a pressure sensor; a piston chamber in the cylinder block is divided into a combustion chamber, an air intake chamber, a balance chamber, a pump chamber and a compression chamber by the piston assembly. As a pipeline connected with two inlets of a compression main port and a compression starting port of the compression chamber and the compression accumulator is provided with the proportional pressure reducing valve, the proportional velocity regulating valve, a reversing valve, the proportional overflow valve and the pressure sensor, according to the detection signal of the pressure sensor connected with the compression accumulator, the reversing valve is switched between the compression accumulator and an oil supply accumulator, and therefore oil supply work on high and low-pressure two oil lines is completed by utilizing one hydraulic pump station; moreover, after hydraulic oil in the compression accumulator flows through the proportional pressure reducing valve, stable pressure can be obtained and supplied for the compression chamber, so that the pressure of the inlet of the compression chamber is stable.

The invention discloses an adaptive charging control circuit and control method for a switch charger. When a reference current adjusting circuit determines that an over-current phenomenon occurs at an input current of a switch charger, an input current reference signal is reduced step by step, thereby reducing the input current of the switch charger; and thus the output voltage of the input power supply returns to a safety value range. Because with a step-by-step input current reduction method, minimization of the charging current of the switch charger can be avoided and a large value can be kept, so that rapid charging can be realized.

The invention relates to a double flexible pair-based three-degree-of-freedom precision adjustment parallel mechanism, comprising three groups of motion branch chains which are connected in parallel and have the same structure, wherein the three groups of motion branch chains are in uneven circumference distribution at three extending ends of an immersion unit by taking a center hole of the immersion unit as a center; each group of motion branch chain comprises a linear motion assembly, a double flexible pair connecting rod assembly, a mechanical anti-collision assembly, a Z-direction displacement measuring assembly and a gravity compensation assembly. The double flexible pair-based three-degree-of-freedom precision adjustment parallel mechanism is used for realizing installation, fixationand space position adjustment of the immersion unit of an immersion type photoetching machine and realizing micron-level positioning of the immersion unit; double flexible pairs are adopted, the structure is simple and compact, and the advantages of no friction and no need of lubrication are achieved; the wholly mechanism adopts a parallel mechanism, the rigidity is high, the response is quick, the adjustment range is large, modular design and assembly are adopted, and the mechanism can be used for three-degree-of-freedom precision adjustment in other occasions except the immersion type photoetching machine.

The invention discloses a multiphase DC-DC converter including an input end for receiving DC input voltage, a plurality of parallelly connected single-phase DC-DC converters for performing DC-DC conversion on DC input voltage, an output end for outputting the DC output voltage converted by the plurality of single-phase DC-DC converters, and an equalization circuit which is serially connected with the plurality of parallelly connected single-phase DC-DC converters between the input end and the output end of the multiphase DC-DC converter and is used for equalizing the current of the single-phase DC-DC converters.

A control unit and a method for triggering personal protection devices are proposed, which charge an energy reservoir for the control unit via a charging circuit. The charging circuit sets a charging rate for charging as a function of a signal generated outside the charging surface.

The invention discloses a control system for an energy saving electro-hydraulic air-changeable door, which can realize the recovery of energy and recycle, comprises constant pump, one-way valve, safe valve, energy storage device, hydraulic actuator, air door, pressure test device and high-speed switch valve. The hydraulic actuator comprises oil cylinder, piston and piston bar. The constant pump inputs energy to the energy storage device. The one-way valve between the energy storage device and the hydraulic pump can prevent the pressure oil in the energy storage device returning. The high-pressure energy storage device is connected with the pressure port of three-way high-speed switch valve and the left cavity of cylinder is connected with the control port of high-speed switch valve. When the right cavity of cylinder is not connected with the oil return port of high-speed switch valve, the oil return port of high-speed switch valve is connected with the oil tank. The energy storage device provides energy to the hydraulic actuator. As the pressure test device measures the pressure value at the outlet of energy storage device, energy is filled in the energy storage device in time so as to decrease the energy consumption of system greatly.

The invention relates to an input current closed-loop amplitude limiting method and system during a grid voltage drop of an air conditioning system. The method comprises the following steps: limiting the amplitude of electromagnetic torque compensation TeComp through an input current effective value and an input current effective value protective threshold value; adjusting the electromagnetic torque given quantity Te_ref through the electromagnetic torque compensation TeComp with limited amplitude to obtain the final electromagnetic torque given quantity for compressor operation; processing the final electromagnetic torque given quantity for compressor operation through a maximum torque/current ratio control module to obtain the direct-axis current given quantity Id_ref and the quadrature-axis current given quantity Iq_ref; performing vector control on a compressor to realize limiting on the input current effective value Iin_rms. According to the method, during the grid voltage drop, the operation efficiency of the compressor is limited through limiting the output electromagnetic torque of the compressor, the effects of reduction of the compressor power and reduction of the input current are realized, the method has a high response speed, the input current is within the overcurrent capacity of an input circuit, the circuit is prevented from being damaged, and normal operation of the system is guaranteed.

The invention provides a power system that can improve power factor and power loss, and realize miniaturization of a transformer comparing to the past, wherein the power system (100) comprises the following components: a power transformer (110) that can change AC100V to AC24V; and a plurality of power source units (200-1 to 200-n) connected to the power transformer (110). The power source units (200-1 to 200-n) comprises the following components: a rectification circuit (210) that rectifies the AC24v through a synchronous rectifier bridge; a power factor improving circuit (220) that improves power factor to voltage after rectification; and an output circuit (230) that outputs the direct current voltage. The power factor improving circuit (220) comprises an induction coil L, a FET (1), a FET (2), and a control circuit (222) that controls the switch of the FET (1) and the FET (2), wherein the control circuit (222) adjusts dutyfactor of the FET (1) and the FET (2) so as to make the expected DC voltage output from the output circuit (230).

The invention discloses a distributed-type wheel-edge electrically-driven power assembly of an electric vehicle and a method. In the power assembly, a two-in-one speed reducer is internally provided with two gear speed reducing structures without interference in structure, and the two gear speed reducing structures are integrally mounted through a shell; a first motor and a second motor are symmetrically distributed on the left side and the right side of the two-in-one speed reducer correspondingly and connected with input shafts of the two gear speed reducing structures in the two-in-one speed reducer; a first half shaft assembly and a second half shaft assembly are arranged on the left side and the right side of the two-in-one speed reducer correspondingly, one ends of the first half shaft assembly and the second half shaft assembly are connected with output shafts of the two gear speed reducing structures in the two-in-one speed reducer correspondingly, and the other ends of the first half shaft assembly and the second half shaft assembly are connected with a first wheel and a second wheel correspondingly, and the output shaft and the corresponding input shaft of each gear speedreducing structure in the two-in-one speed reducer are parallel and not collinear; and the whole power assembly is distributed in a mirror-image symmetrical mode along the center of the two-in-one speed reducer of the power assembly. A feasible arranging scheme of the wheel-edge motor-driven power assembly adopted by the electric vehicle has the characteristics of being compact in structure and simple and convenient to mount.

The invention relates to a handheld testing device used for testing of a refrigerator electric control board and a testing method. The handheld testing device is in direct communication with the refrigerator electric control board; the corresponding forced load working mode of the handheld testing device is set according to the fault phenomenon of the whole machine, then a corresponding control instruction and a corresponding code are generated, the control instruction is sent to the refrigerator electric control board, and the refrigerator electric control board controls corresponding loads to work independently and feeds back the operation situations of the corresponding loads; when starting of the corresponding loads fails, it is judged that the electric control board has a fault; when starting of the corresponding loads succeeds, an output port of the corresponding loads of the refrigerator electric control board is tested according to the displayed corresponding code, and whether the electric control board has a fault or not is judged. The after-sale repair convenience and accuracy are improved; the repairing frequency is reduced; the after-sale repair expenses of users are reduced; the market reject ratio of electric control boards is reduced; the brand credibility is improved.

The invention provides a self-locking and interlocking switch with multiple grades. The self-locking and interlocking switch with multiple grades has the technical characteristics that the multiple grade switch of self-locking and interlocking is composed of a 12 voltage direct current source, operation amplifier integrated circuits (IC) 1, an output voltage even division circuit, and a direct current source voltage division circuit. The model of the operation amplifier IC1 is LM324. Each operation amplifier IC1 can form a self-locking and interlocking switch circuit with 4 grades. The structure of each grade self-locking and interlocking switch circuit is the same. Components and connection feature of a second grade and other grade self-locking and interlocking switch circuits are identical with components and connection feature of a first self-locking and interlocking switch circuit. According to the multiple self-locking and interlocking switch, defaults of mechanical self-locking and interlocking switch are overcome. Due to the fact that input impedance of the operational amplifier is high, input current of key switch is minimal, input and output electrical level of the switch meet the requirement of interface electrical level of a digital circuit, and the multiple grade switch of self-locking and interlocking can share work power source with the digital circuit. The multiple grade switch of self-locking and interlocking is characterized in that application range of voltage is wide, and grade can be arbitrarily designed.

The invention discloses a winding device of textile equipment, and belongs to the field of textile equipment. The winding device of the textile equipment comprises two supporting vertical plates whichare symmetrically arranged, a rotating shaft is rotatably connected between the two supporting vertical plates, a drum is fixedly connected to the positioning outer wall of the rotating shaft, slideways are correspondingly formed in the opposite side walls of the two supporting vertical plates, a sliding block which is in fit with the outer wall of the upper end of the drum is slidably connectedbetween the two slideways, slide rheostats are arranged on the side walls of the slideways, a variable resistance sliding sheet matched with the slide rheostats is fixedly connected to the side wall of the sliding block, an energy storage box and a cutting box are fixedly connected between the two supporting vertical plates, and automatic cutting mechanisms connected with the sliding block are arranged in the energy storage box and the cutting box. According to the winding device, the rotation speed of the drum is controlled while winding a textile cloth, so as to prevent the pulling damage ofthe textile cloth when the diameter of the drum is large, the textile cloth at the upper end of the drum can further be automatically cut off, and using is more convenient.

The invention discloses a buffer control circuit and a buffer control method of a motor device. Startup operation of the motor device M is realized through a buffer resistance circuit, and the input voltage of the motor voltage M is reduced by using the voltage division effect of a resistor for the input voltage, so that the input current of the motor device M is reduced. The used buffer resistance circuit is relatively simple in structure, and the safety of the motor device M is guaranteed.

The invention discloses a vector control method for a frequency converter, applied to the frequency converter that outputs electric energy to a motor through an LC output filter. The method comprisesthe following steps: obtaining an output current of the frequency converter; obtaining a compensation current value corresponding to the current of a filter capacitor according to the output current of the frequency converter, electrical parameters of the LC output filter, and the reference voltage of the frequency converter; obtaining a control parameter of the frequency converter according to the compensation current value; and controls the frequency converter by using the control parameter of the frequency converter. By using the compensation current value obtained by the output current ofthe frequency converter, the electrical parameters of the LC output filter and the reference voltage of the frequency converter, the control parameters of the frequency converter are obtained, therebycontrolling the frequency converter to output a relatively ideal current, adjusting the reactive current output by the frequency inverter, and reducing the output voltage of the inverter, so as to reduce the input current of the motor and reduce the loss of the motor. The application also discloses a vector control system and device for a frequency converter.

The invention discloses a counteracting circuit for input current of an operational amplifier. The counteracting circuit comprises a differential input stage, an input current counteracting circuit and an output stage, a first end of the differential input stage is connected with a first end of the input current offset circuit and then connected to a positive and negative input end, a second end of the differential input stage is connected with a second end of the input current offset circuit and then connected to a power supply, and a third end of the differential input stage is connected with a third end of the input current offset circuit and then connected to a bias voltage. The fourth end of the differential input stage is grounded after being connected with the fourth end of the input current offset circuit; the fifth end of the differential input stage is connected with the first end of the output stage, and the second end of the output stage is connected to a voltage output end. According to the operational amplifier, the input current of the differential input stage is greatly reduced, and the input impedance of the operational amplifier approaches to infinity.

The invention discloses a handheld active control type electric welder. The electric welder comprises a power module and an operation handle, wherein a main control panel, a charging/discharging circuit, a power output board and a welding head are fixedly arranged on the operation handle; the charging/discharging circuit comprises a charging switch and a plurality of charging/discharging units arranged in parallel; each charging/discharging unit comprises an electrolytic condenser and a discharging switch; each of the charging switch and the discharging switch is an MOSFET tube. The handheld active control type electric welder disclosed by the invention has the advantages of high integration degree, small size, low cost and the like, and can realize the active control of the output time of welding current, so that the success rate of welding is increased; the electric welder adopts the confluence of the parallel charging/discharging units, so that each MOSFET tube is guaranteed to normally work; besides, the large current for welding is satisfied, so that the MOSDET tubes can be used for controlling large current.