50results about How to "Improve voltage regulation" patented technology

A method comprises determining an operating mode based upon an input voltage and an output voltage of a resonant converter, wherein the resonant converter comprises a switch network coupled to an input dc power source, a resonant tank coupled to the switch network and a transformer coupled between the resonant tank and a secondary rectifier, wherein the secondary rectifier is a full-bridge rectifier, configuring the switch network to operate at a buck converter mode in response to a first input voltage and configuring the secondary rectifier to operate at a boost converter mode in response to a second input voltage, wherein the first voltage is higher than the output voltage and the second voltage is lower than the output voltage.

A method is described for controlling a plurality of power converters 1, 2 connected in parallel between an ac arrangement 12 and a common dc link 16, each of the power converters 1, 2 operating in accordance with a pulse width modulation (PWM) strategy and having an independently variable dc link reference voltage. The method comprises modifying an output voltage droop characteristic of at least one of the plurality of parallel-connected power converters 1, 2 by varying the dc link reference voltage of the at least one power converter 1, 2 based on the output current of the at least one power converter 1, 2 and the average of the output currents of the plurality of power converters 1, 2.

The invention relates to a double-closed-loop feedback-control module, wherein two closed-loop control loops are formed in the starting process and the holding stage of a contactor to directly and accurately control the coil current of the contactor, so that the optimizing control for the integral action characteristic of the contactor can be carried out, and the integral performance index of the contactor is comprehensively improved. The double-closed-loop feedback-control module has low hardware cost, the voltage-adjusting rate of a system can be improved, the transient response speed of the system is increased, and the stability of the system is enhanced.

A switching voltage regulator including a comparison module configured to receive a reference voltage and a feedback voltage and to generate a comparison signal corresponding to a difference between the reference voltage and the feedback voltage, an offset module configured to generate an offset signal based on a number of active phases of the voltage regulator, an adder configured to generate a control signal based on the comparison signal and the offset signal, a plurality of pulse-width-modulated (PWM) power stages, and a control module configured to control the plurality of PWM power stages based at least in part on the control signal generated by the adder.

An apparatus and method for a linear voltage regulator with improved voltage regulation is disclosed. A linear voltage regulator device with improved voltage regulation that combines good resiliency to noisy ground reference, high Power Supply Rejection Ratio (PSRR), good current load regulation with changes in the current load and good feedback loop stability. The linear voltage regulator comprises of an amplifier, a current source, a pass gate, a current load, a first feedback loop, a second feedback loop, a second amplifier and second pass gate. A second feedback loop is formed to control the bias of the first feedback loop.

An uninterruptible power system with the function of parallel operation comprises one or a plurality of uninterruptible power supply units, each of which has different capacity. The uninterruptible power supply unit comprises a direct current/alternating current converter and a control circuit controlling the converter. The control circuit comprises a voltage feedback control circuit and a current feedforward control circuit. The voltage feedback control circuit comprises a voltage stabilizing control circuit for controlling the load voltage amplitude and a waveform control circuit for controlling the load voltage waveform. The current feedforward control circuit detects the output current of the direct current/alternating current converter and separates out the fundamental wave and harmonic wave constituents of the output current, operating the fundamental wave and harmonic wave constituents into a virtual fundamental wave resistance and a virtual harmonic wave resistance to be in series connected at the output ends of the direct current/alternating current converter equivalently. The outputs of the voltage feedback control circuit and the current feedforward control circuit are added to form a modulation signal that is output to a pulse-width modulation circuit so as to obtain a driving signal of the direct current/alternating current converter.

A power factor correction circuit for driving a switch of a boost type converter circuit having an AC line frequency input, comprising a sense circuit for sensing and comparing the output voltage of the boost type converter circuit to a reference voltage, a circuit responsive to the output of the sense circuit for providing a drive signal for driving the switch, wherein the drive signal comprises a pulsed signal comprising a pulse grouping during each half cycle of the AC line frequency comprising at least one pulse wherein the number of pulses and frequency of the pulses of the pulse grouping changes with the output of the sense circuit up to a threshold value with the pulse width of the pulses being substantially constant; and when the output of the sense circuit has reached the threshold value, the pulse width of the pulses of the pulse grouping are varied in accordance with the output of the sense circuit.

The invention provides a pressure-stabilizing valve comprising a shell, a left end cover, a right end cover and a spool component. The shell comprises a left chamber, a right chamber and a valve hole provided between the left and right chambers; the peripheral wall of the right chamber is provided with a water inlet; the peripheral wall of the valve hole is provided with a water outlet; a junction of the right chamber and the valve hole is provided with a valve seat portion having an inner conical wall; the left end cover and the right end cover are hermetically connected to two ends of the shell, respectively; the spool component penetrates the valve hole of the shell and comprises a piston portion and a sealing portion; the piston portion is limited in the left chamber of the shell and hermetically slides in the axial direction; the sealing portion can be hermetically abutted to the inner conical wall. Through relieved changes in area of water passing between the sealing portion and the inner conical wall along with gradual increase of water pressure, the water from the water inlet to the water outlet is well pressure-relieved, pressure-stabilized and flow-stabilized, especially when a water resource is under the high pressure 50 PSI (pounds per square inch) to 100 PSI.

The present invention discloses an integrated source driver for a liquid crystal display device. The integrated source driver includes a reference voltage generating circuit, for providing a plurality of adjustable voltage ranges within a supply voltage and a ground level, and a reference voltage selecting circuit, including a plurality of digital to analog converters, for selecting and generating a plurality of internal reference voltages from the plurality of adjustable voltage ranges, respectively. The plurality of adjustable voltage ranges decrease progressively.

A power sensing and switching circuit, using voltage and current sensors, integrated circuits and logic gates that detects reverse power flow, from reactive loads, non-linear loads or dispersed electrical generators, and mitigates reverse power flow by functioning as a power factor correction device and by diverting the reverse power flow as recycled power to storage, local usage, or remote usage via a recovery line that mitigates distribution grid instability and speeds up the growth of dispersed electrical generators.

A string set of series-connected incandescent flasher type lamps in which substantially all of the lamp filaments in the set are individually provided with a voltage regulated shunt circuit, which includes a voltage responsive silicon semiconductor device, which operates in one of two conducting states, neither of which is greater than about 200 ohms. When the flasher lamp is in the “on” or illuminated state, the silicon semiconductor voltage regulating shunt device is in a low impedance state. When the flasher is in the “off” state, the impedance of the silicon semiconductor device is in a lower impedance state equal to or slightly greater than the parallel equivalent impedance of silicon semiconductor device in parallel with the normal operating impedance of the flasher lamp.

The invention discloses a gas turbine component air flow test bench and a test method, and relates to the field of flow test devices. The gas turbine component air flow test bench comprises an air source processing device and a test bench body. The air source processing equipment comprises an air compressor, an air storage tank, a primary filter, a refrigerated dryer, a medium-efficiency filter, an adsorption dryer and a high-efficiency filter; and the test bench body comprises a test air supply pipe, a test air main switch valve, a pneumatic pressure regulating valve, an air distributing bag, a plurality of flow meters, switch valves corresponding to the flow meters, an air collecting bag, a surge tank, a pneumatic pressure regulating valve controller, a test piece pressure measuring sensor, an atmospheric pressure sensor, an atmospheric temperature sensor, an air source pressure sensor, a data acquisition controller, upper computer measurement and control software and a pneumatic control system. The test bench is simple and compact in structure and convenient to move, and the test method is simple to operate and easy to master.

An apparatus, system, and method for a voltage regulator for improved voltage regulation using a remote feedback and remote feedback low pass filter. The system comprises of a power management unit, a remote load point (HOST), an inductor, a filtering capacitor, a printed circuit board (PCB) track output net, a ground connection, a remote feedback line, and a low pass filter (LPF). In this present disclosure, the electrical connection of the remote feedback low pass filter to the output filter capacitor minimizes transient ringing, reduced noise coupling, and improved system stability.

The invention relates to the field of water devices, and aims to provide a self-switching pressure-stabilizing three-way shunt which is capable of stabilizing the pressure to prevent the water devices such as a shower head, a closestool and the like from being damaged easily and is convenient for control of water flow shunting. The self-switching pressure-stabilizing three-way shunt comprises a valve body, a valve base for dividing the valve body into a front chamber and a rear chamber, an inner valve core and a compressed spring, wherein the inner valve core comprises a main section, a transit section and a stopping section which are connected sequentially; a middle hole is formed in the valve core; a spacer block is arranged at the middle part of the middle hole; an upper hole, a main hole, a transit hole, a stopping hole and a lower hole are formed in the valve base sequentially in the radial direction of the valve body; an upper groove communicated with the front chamber is formed in the middle part of the lateral side of the valve base; a lower groove communicated with the lower hole and the rear chamber respectively is formed in the lower end of the valve base; a water intake hole communicated with the transit hole is formed in the lower side surface of the upper groove; two ends of the compressed spring are in contact with the lower end surface of the stopping hole and the lower end surface of the spacer block respectively; a first sealing ring is arranged at the upper part of the main section; and a second sealing ring is arranged at the lower part of the transit section.

The invention discloses an efficient transmission mechanism of a water turbine. The efficient transmission mechanism comprises a first shell, a bottom plate is fixedly arranged on one side of the lower end of the first shell, the side wall of one end of the first shell is rotationally sleeved with a second rotating shaft, a first turntable is fixedly arranged at one end of the second rotating shaft and located in the first shell, and a plurality of rotating plates are arranged on the first turntable at equal intervals; a water delivery device is arranged on one side of the first shell in a penetrating manner; and the other end of the second rotating shaft is rotationally sleeved with a second shell, a fourth gear is fixedly arranged at the other end of the second rotating shaft, and the fourth gear is located in the second shell. The efficient transmission mechanism can effectively utilize water resources, improves the conversion efficiency of water potential energy and is convenient to adjust, and therefore achieves the purpose of stable and efficient transmission, and the efficient transmission mechanism can ensure the normal work of water turbine power generation equipment, improves the output power and is conducive to stabilizing the voltage and prolonging the service life of the equipment.

The invention discloses a converter station reactive power optimization method considering a main transformer low-voltage side reactive power compensation device, and the method comprises the steps: adding a low capacitor and a low reactor into an option of a reactive power equipment switching strategy, and obtaining a reactive power balance calculation method under the method; optimizing a reactive exchange capacity interval between the converter station and the alternating current system; formulating a strategy of automatically switching reactive power compensation equipment considering a Qcontrol function of low capacitance and low reactance, and modifying control logic in a direct current station control system; realizing the automatic switching of the reactive power compensation device by the Qcontrol function; and when necessary, manually switching low capacity and low reactance for voltage regulation. According to the invention, reactive compensation capabilities of reactive compensation devices with low capacitance, low reactance and the like are utilized in reactive adjustment of the high-voltage direct current system, the reactive adjustment gradient is reduced, and meanwhile, by adjusting the reactive exchange capacity interval of the converter station and the alternating current system, the input group number of alternating current filters is reduced, the resource configuration is optimized, and the voltage control capability is improved.

The invention provides a multifunctional electric power equipment monitoring system. The multifunctional electric power equipment monitoring system comprises electric power equipment, wherein the electric power equipment is connected with a partial discharge monitoring apparatus, a power distribution protection apparatus and a reactive compensation apparatus, wherein the partial discharge monitoring apparatus, the power distribution protection apparatus and the reactive compensation apparatus are connected with a central controller; and the central controller realizes electric quantity monitoring, power distribution protection and reactive compensation of the electric power equipment. By adoption of the multifunctional electric power equipment monitoring system, reactive compensation of a power grid can be realized; meanwhile, power distribution can be achieved; and in addition, a partial discharge phenomenon can be avoided and balanced operation of the equipment is ensured while the power factor is ensured and electric energy loss is reduced.

The invention provides a multi-point voltage control method for direct-current power grids. The multi-point voltage control method includes that system power and conversion station power are controlled, and for control of the system power, sum of active power output by voltage regulation conversion stations is calculated according to size of the direct-current power grids; for the control of the conversion station power, output of the active power is calculated according to the size of active capacity of the conversion stations. The conversion stations involving in system voltage regulation are equivalent to a whole, capacity of multiple conversion stations is utilized, and voltage regulation capacity of the direct-current power grids is improved; under the premise that the sum of the active power is assuredly constant, output of the active power of all the conversion stations involving in voltage regulation can be regulated according to the size of the capacity of the conversion stations, power utilization in regulating the conversion stations can be equivalent, and safety and stability in operation of the direct-current power grids are improved.

The invention discloses an energy-saving mobile power supply based on solar energy. The energy-saving mobile power supply comprises a charging interface circuit, a main controller, a power supply battery pack and an output interface circuit, and also comprises a solar energy conversion circuit and a voltage stabilizing circuit. The voltage stabilizing circuit comprises first and second resistors, first to third capacitors, and a voltage stabilizer. An input end of the voltage stabilizing circuit is respectively connected to one end of the first capacitor and one end of the first resistor. The other end of the first capacitor is grounded, and the other end of the first resistor is connected to an input end of the voltage stabilizer and one end of the second capacitor. A ground end of the voltage stabilizer is connected to the second resistor and then grounded, and the other end of the second capacitor is grounded. An output end of the voltage stabilizer is connected to the third capacitor to act as an output end of the voltage stabilizing circuit. According to the invention, the energy-saving mobile power supply based on the solar energy can realize the energy collection and conversion, is conducive to sustaining the energy of the power supply battery pack and prolonging the service life of the battery pack, and further improves the charging and voltage stabilizing effects.

The invention relates to a direct-current power parallel system and a method for controlling the same. The direct-current power parallel system and the method have the main advantages that output ends of a plurality of direct-current power modules are connected with loads in parallel, each direct-current power module is provided with a virtual voltage drop computing unit, and feedback signals of the output ends are adjusted, so that increase of output impedance can be simulated, and the current-sharing parallel purpose can be achieved by the various direct-current power modules by the aid of a virtual voltage drop process; a voltage regulating unit is further arranged in more than one direct-current power module, so that voltages outputted to the loads can be corrected according to fed outputted voltages, and the voltage regulating ability of the parallel system can be improved.

The invention discloses a high-permeability photovoltaic access power distribution network multi-terminal cooperative voltage treatment method and system and a storage medium. In the method, when time-phased and systematic overvoltage/undervoltage occurs, a centralized intelligent coordinated voltage regulation method is adopted; comprising the steps of network end transformer gear switching, distributed power supply multifunctional grid-connected inverter Q/P adjustment, distributed energy storage inverter Q/P adjustment and adoption of a load end reactive power compensator SVC. When intermittent local overvoltage/undervoltage occurs, a terminal multi-agent distributed cooperative voltage regulation method is adopted, and distributed cooperative voltage regulation algorithms of a distributed power supply multifunctional grid-connected inverter, a distributed energy storage inverter and a load end SVC of local and adjacent nodes are utilized to perform distributed cooperative compensation on local node voltage. According to the power distribution network multi-terminal cooperative voltage treatment method and system, systematic treatment of the whole-network and decentralized voltage problem is realized.

This invention discloses a control method for current transformer parallel operation in which, its control loop includes a voltage feed-back circuit and a current supply circuit and the said first one includes a regulation control circuit and a wave control circuit, the said regulation control circuit provides a load voltage amplitude at a certain value, the wave control circuit improves the general harmonic distortion rate of the output voltage, the said current supply circuit takes out the output current of the transformer to divide it into a basic wave and harmonic wave then to be amplified and the basic wave is taken as the damp between the current transformers and the amplified harmonic as the damp of the output filter.