41results about How to "Increase the supply voltage" patented technology

The invention relates to the field of mobile communication and particularly relates to a method for adjusting a power supply voltage of a radio frequency power amplifier and a radio frequency circuit and is used for solving the problem that in the prior art, the power supply voltage of the radio frequency power amplifier cannot be flexibly adjusted. According to the embodiment of the invention, power output to an antenna by a radio frequency front end is coupled based on a coupling coefficient and then is fed back to a radio frequency transceiver. Transmitting power on a target channel and power on an adjacent channel of the target channel are calculated according to the feedback coupled power. The power supply voltage of the radio frequency power amplifier is adjusted according to a difference value between the transmitting power and the power on the adjacent channel of the target channel. According to the embodiment of the invention, the power supply voltage of the radio frequency power amplifier can be adjusted flexibly in real time according to the difference value between the transmitting power and the power on the adjacent channel of the target channel, so the power consumption when the radio frequency power amplifier works can be effectively reduced, and the standby and endurance duration of a mobile terminal can be prolonged.

The invention relates to an equal-zero-sequence-current phase-change switch type three-phase load automatic adjustment method and device, and relates to the technical field of power systems. The method comprises the steps: collecting a three-phase voltage value and a three-phase current value of a low-voltage outlet side circuit of a distribution transformer; determining the unbalance degree of athree-phase load, searching a to-be-switched equal-zero-sequence-current low-voltage load automatic phase-change switch and carrying out the pre-judgment of the unbalance degree of the three-phase load after load transfer. The method is suitable for a low-voltage side of the distribution transformer in a transformer region and is mainly used for the real-time and automatic distribution and adjustment (balancing) of the total load among three phases, and enabling the total load to be basically in a balance state, wherein the dynamic balance degree reaches the optimal value, and the current passing through a zero line is the minimum, thereby greatly reducing the loss of the transformer and the line loss of a low-voltage power supply line and improving the total load capacity of the transformer. Meanwhile, the method also can increase the supply voltage of the tail end of the low-voltage line (partly solving a low-voltage problem of the tail end), and greatly improves the power utilization quality.

The present invention applies to the field of energy saving, and in particular, to an apparatus, a method, and a mobile terminal for reducing power consumption on a power amplifier. In embodiments of the present invention, a controller is separately connected to a temperature detector and a voltage converter. The controller searches for, according to a temperature of the power amplifier detected by the temperature detector, a voltage compensation value corresponding to the temperature, and controls, according to the voltage compensation value, the voltage converter to output a power voltage that is capable of improving efficiency of the power amplifier. This may enable the power amplifier to work in an optimal efficiency at any temperature, and greatly reduce the power consumption of the power amplifier.

The invention discloses a fabrication method of a P-type crystal-silicon solar cell with a passivation back surface. Planarization recovery processing is performed on a bottom surface and a side wallof a laser groove in a back surface of a silicon wafer by a chemical etching method with regard to the silicon wafer after being grooved by laser, a diffusion layer on a front surface of the silicon wafer is simultaneously etched, the concentration gradient of doping phosphate atoms in the diffusion layer is optimized, an emitter is optimized, and a SiO2 thin film and a second silicon nitride anti-reflection film are deposited on the front surface of the silicon wafer. According to the fabrication method, the open-circuit voltage and the photovoltaic conversion efficiency of a solar cell pieceare improved by recovering a damage layer.

The invention relates to the technical field of vacuum metallurgy equipment, in particular to a vacuum reduction furnace for electromagnetic induction heating melting reduction of magnesium metal. The vacuum reduction furnace comprises a furnace body (1), a hopper (4) made of a hard insulating material is arranged in the furnace body (1), and a center channel penetrating the bottom face of the hopper (4) is arranged in the center position of the hopper (4); one or more annular grooves (7) are concentrically arranged in the bottom face of the hopper (4), and iron in the solid state or the molten state is arranged in the grooves (7); a rectangular iron core (6) is arranged in the furnace body (1), one side of the rectangular iron core (6) penetrates the center channel of the hopper (4), and the other side of the rectangular iron core (6) is wound with a primary side coil (9); and the leading-out end of a copper winding of the primary side coil (9) is led out of the furnace through an insulation sealing device on the furnace body (1) so as to be connected with a power device. The vacuum reduction furnace is reasonable in design, distribution of a temperature field of the reduction furnace can be adjusted, and the heat transferring efficiency is high; and the vacuum reduction furnace is used for thermal reduction production of high-vapor-pressure metal such as magnesium, lithium, strontium and calcium and the like.

The invention discloses a household magnesium air battery system including a magnesium air battery pack, an electrolyte regeneration tank and an electrolyte circulation pump. A conical funnel is arranged at the bottom of the magnesium air battery pack, and the bottom of each of anode plates of the magnesium air battery pack is provided with an opening communicated with the conical funnel; the conical funnel is communicated with the upper part of the electrolyte regeneration tank through a pipeline, the middle part of the electrolyte regeneration tank is provided with a filter plate, and the bottom of the electrolyte regeneration tank is communicated with the magnesium air battery pack through the electrolyte circulating pump. The household magnesium air battery system is provided with the electrolyte regeneration tank, so that an electrolyte can be regenerated for utilization, and simultaneously generated hydroxides can also be conveniently recycled, the waste discharge during a battery using process is reduced, and the battery using cost is reduced; and at the same time, electrolyte replacement adopts the pump to convey, and thus the battery maintenance is greatly facilitated.

The invention relates to the technical field of vacuum metallurgy equipment, in particular to a vacuum reduction furnace for electromagnetic induction heating melting reduction of magnesium metal. The vacuum reduction furnace comprises a furnace body (1), a hopper (4) made of a hard insulating material is arranged in the furnace body (1), and a center channel penetrating the bottom face of the hopper (4) is arranged in the center position of the hopper (4); one or more annular grooves (7) are concentrically arranged in the bottom face of the hopper (4), and iron in the solid state or the molten state is arranged in the grooves (7); a rectangular iron core (6) is arranged in the furnace body (1), one side of the rectangular iron core (6) penetrates the center channel of the hopper (4), and the other side of the rectangular iron core (6) is wound with a primary side coil (9); and the leading-out end of a copper winding of the primary side coil (9) is led out of the furnace through an insulation sealing device on the furnace body (1) so as to be connected with a power device. The vacuum reduction furnace is reasonable in design, distribution of a temperature field of the reduction furnace can be adjusted, and the heat transferring efficiency is high; and the vacuum reduction furnace is used for thermal reduction production of high-vapor-pressure metal such as magnesium, lithium, strontium and calcium and the like.

The invention discloses a method for optimizing operational parameters of a direct air-cooling fan variable frequency speed control drive system so as to solve the problem that when the system runs, a motor insufficiently output and the cooling performance can not meet the design requirements. The system comprises a supply transformer, a breaker, an incoming line alternating current filter, a transducer, an outgoing line alternating current filter, a cable, an electric motor, a reduction gearbox and a fan which are connected with each other. The method has the steps: (1) the input voltage of the transducer is increased to be 1.05-1.15 times of the rated voltage of the motor; (2) when the output frequency of the transducer is set to be 50Hz, the output voltage valve is 1.03-1.1 times of the rated voltage of the electric motor; (3) the output frequency of the transducer is set to be 44Hz-47Hz, which is corresponding to the rated revolution of the fan; (4) the output frequency of the transducer is set to be 48Hz-51Hz, which is corresponding to the maximum revolution of the fan. The method can reduce the working current of the system, increases the working voltage and output torque of the motor, reduces the heat productivity, saves electrical energy and solves the problem of high system failure rate.

The invention provides a control method of a vehicle brake caliper introduced with an energy accumulator, the brake caliper is driven by a motor, and when the motor is in a turn-off state, the motor is started to be turned off, and the control method comprises the following steps: step 1, confirming whether the energy accumulator is in an available state or not; step 2, controlling a relay to switch an energy accumulator into a motor power supply circuit; step 3, switching on a switch tube of a motor control loop, and performing motor control; 4, when the energy accumulator needs to be cut out of the motor power supply circuit, a switching tube in a motor control loop is closed firstly, and then the energy accumulator is cut out; and step 5, when the motor is closed through the switch tube, the positive and negative ends of the motor are short-circuited, so that the motor can be quickly stopped after the power supply is cut off. On the premise of comprehensively considering the cost performance of the actual system, the energy accumulator is ensured to be safely switched in and out of the power supply circuit, the response speed of the motor is improved, and accurate control when the motor stops is ensured.

The invention provides a rotating shaft angle and speed measuring device to improve the measuring precision of an existing rotating shaft angle and speed measuring device. The structure of the devicecomprises a permanent magnet, a chip integrated with a magnetoresistive sensor, and a PCB circuit board. A number of chips are arranged on the upper end face of the PCB circuit board. A number of counter bores are arranged in the lower end face of the PCB circuit board. The axis of each counter bore passes through the centroid of a chip. The permanent magnet and the PCB circuit board are firmly connected through the counter bores. The magnetoresistive sensor is provided with a first power supply connection end, a grounding end, a first signal output end and a second signal output end. The first signal output end is connected in series with a first resistor and is electrically connected with a second power supply connection end. The first signal output end is connected in series with a second resistor and is grounded. The second signal output end is connected in series with a third resistor and is electrically connected with the second power supply connection end. The second signal output end is connected in series with a fourth resistor and is grounded. According to the invention, the connection relationship between the permanent magnet and the PCB circuit board is improved, and the detection sensitivity is greatly improved.

A non-split-phase type traction power supply device used for rail vehicles belongs to technical field of railway electric traction power supply. The device comprises a traction transformator and an energy distribution regulating machine which mainly consists of a main controller, a driver, an electronic power switch bridgearm, a support capacitance arm, three electric current sensors, three voltage transducers and three reactors, wherein, the driver is connected between a control terminal of the electronic power switch bridgearm and the main controller, the electric current sensors and the voltage transducers are respectively connected between the main controller and A phase, B phase and C phase of an output end of the traction transformator, and the reactors are connected between the center of the bridgearm and the A phase, the B phase and the C phase of an output end of the traction transformator. The invention has the advantages that split-phase power supply is changed into non-split-phase power supply, great run-through of the traction contact network can be realized, and power phase position exchange for power supply again caused by frequent power failure can be avoided, so that safe, high speed and high-efficiency running of train can be guaranteed.

The invention relates to an actuator (1) which is designed to convert electrical signals into mechanical movements, the actuator has a disengagement function for eliminating functional faults, such as jamming, wherein a device is provided for The increased voltage is supplied to the actuator (1) when the disengagement function is activated.

The invention relates to a method for managing the power supply of a passive remote meter reading system. The passive remote meter reading system generally consists of meter reading buses, meter reading system devices, passive intelligent instruments and meters, wherein the passive intelligent instruments and the meters are not provided with power supplies and are provided with an only electroniclabel code for identification respectively; each meter reading system device is connected with a plurality of the passive intelligent instruments and the meters; and the method comprises the following steps that: when performing meter reading tasks, the meter reading device supplies power to the passive intelligent instruments and the meters through the meter reading buses and sends information with the electronic label codes to the passive intelligent instruments and the meters simultaneously; after receiving the information, the passive intelligent instruments and the meters process the information and respond corresponding information to the meter reading device; after receiving the response information, the meter reading system device makes confirmation and sends information to notifythe passive intelligent instruments and the meters to enter a working mode with ultra-low power consumption or stop working; and the operations are repeated in turn so that each passive intelligent instrument and each meter in the passive remote meter reading system stops working in turn to achieve the effect of reducing the current consumption of the system and increasing the stability of the system.

The invention provides a random access memory (RAM) and a power supply method thereof. The RAM comprises a voltage generation module which is used for boosting the external supply voltage, and the boosted voltage is provided for a memory array in the RAM. According to the RAM and the power supply method, the stability of the RAM under deep submicron technology and ultra-deep submicron technology can be effectively improved.

The present invention relates to an insulation fault location system and method for insulation fault location of an ungrounded DC supply system powered from a first direct voltage supply source connected to a diode and a second direct voltage connected to the diode The power supply is fed redundantly and the consumers are redundantly coupled to the ungrounded DC power supply system. Due to the asymmetrical current splitting of the diode connections and the load currents associated with them, non-compensating partial currents are generated in the supply lines in such power supply systems and thus can be captured by measuring current transformers and can be detected during insulation fault location Interfering with the differential current portion of the effective test current. In order to eliminate interfering differential current components, compensation measures are proposed on the primary side in the measuring current transformer and indirect compensation measures on the secondary side in the insulation fault location device.

The invention provides a reference voltage curve acquisition method based on a full analog circuit, by determining the working principle of the reference voltage curve and the full analog circuit for testing; according to the working principle of the reference voltage curve, the reference voltage curve is sequenced in the full analog circuit Control; control the voltage and slope of the reference voltage curve in the full analog circuit; combine timing control, high-power charge and discharge control and voltage interval identification control to obtain the reference voltage curve. The method proposed by the invention is simple and efficient, overcomes the bottleneck problem of the highest rate, improves the EMC performance of the circuit, and cleverly designs an accurate voltage reference curve with the least electronic components.