37results about How to "Voltage regulation" patented technology

The invention discloses a UHVDC transmission control method and control device based on a calculation voltage value. A midpoint voltage measurement fault is determined according to a 12-12 pulsating DC pole midpoint voltage measurement value or a midpoint voltage measurement point feedback signal, and a valve group voltage calculation value is employed as a feedback voltage for control; a voltage correction unit is configured at a rectification side, difference of the valve group voltage calculation value and a valve group voltage reference value is superposed to difference of a valve group current measurement value of a current adjusting unit and a valve group current reference value, and a trigger delay angle of a valve group is controlled through a PI adjusting device according to the result; a voltage control unit is configured at an inversion side, the trigger delay angle of the valve group is controlled through the PI adjusting device according to the difference of the valve group voltage reference value and the valve group voltage calculation value. The method is advantaged in that stable voltage control on UHVDC can be realized without a 12-12 pulsating DC pole midpoint voltage measurement point or under a voltage measurement point fault. The invention further discloses a UHVDC transmission control device based on the calculation voltage value.

The invention discloses a storage battery with an intelligent management function, and relates to the field of automobile storage battery design. The storage battery comprises a storage battery body as well as a detection unit, an executor and an intelligent module unit which are arranged on the storage batter body, wherein the detection unit is used for automatically detecting a state of the storage battery; the executor is used for adjusting the state of the storage battery; and the intelligent module unit is used for processing feedback information of the detection unit of the storage battery and controlling the executor based on an information processing result so as to correct the state of the storage battery. Therefore, the storage battery is more intelligently maintained; the performance of the storage battery is improved; the service life of the storage battery is prolonged; and the negative influence on a vehicle due to a storage battery fault is effectively prevented.

The invention provides a solar DC voltage increase and stabilizing type charging power supply. The solar DC voltage increase and stabilizing type charging power supply comprises a solar battery, a storage battery pack, a power-shortage protection circuit, an adjustable square wave circuit, a DC voltage increase circuit and a DC adjustable voltage stabilizing circuit which are sequentially connected; the solar battery is used for photoelectric conversion; the electricity energy produced by the photoelectric conversion of the solar battery is used for charging the storage battery pack, and the nominal voltage of the storage battery pack is 6V; the power-shortage protection circuit is used for stopping discharging of the storage battery pack when the end voltage of the storage battery pack is less than 5.7V; the adjustable square wave circuit outputs a square wave impulse signal of which the duty ratio K is adjustable and is not less than 50%; the DC voltage increase circuit increases the voltage through the resistance adjusting of a first potentiometer; the DC adjustable voltage stabilizing circuit is used for stabilizing the voltage of the DC voltage increase circuit by the synchronous adjusting of a double-link adjustable potentiometer, and the stable output voltage ranges from 10 to 230V. The solar DC voltage increase and stabilizing type charging power supply has the advantages of being applicable to charging of electronic devices with different charging voltage types, energy saving, environmentally friendly, charging on real time, and being flexible and convenient to charge.

Embodiments of the invention provide a USB interface charging circuit, and relates to auto parts. The circuit can compensate for charging voltages according to USB line losses so that the voltage dropcaused by the line losses can be compensated for, and thus, the USB charging voltages can accord with related certification rules. The circuit includes a voltage dividing resistor, a voltage detection unit, a CPU and a PWM voltage modulation module; the control end of the PWM voltage modulation module is connected to the PWM end of the CPU; the input end of the PWM voltage modulation module is connected to the input end of a power supply; the output end of the PWM voltage modulation module is connected to the first end of the voltage dividing resistor; and the PWM voltage modulation module isused for receiving a PWM control signal, and adjusts the duty ratio of the conducting time of the input end and output end of the PWM voltage modulation module according to the PWM control signal soas to adjust the voltages output by the power supply pins of a USB interface. The embodiment of the invention is used for the USB interfaces.

The invention provides a voltage regulating transformer which comprises a main transformer body and a string transformer body. The main transformer body comprises a main transformer public coil, a main transformer series-connection coil and a main transformer voltage regulating coil, wherein the main transformer public coil and the main transformer series-connection coil are in series connection with a wire inlet end, and the main transformer voltage regulating coil is in electromagnetic coupling with the main transformer public coil and the main transformer series-connection coil. The string transformer body comprises a string transformer primary coil and a string transformer secondary coil, wherein the string transformer primary coil and the string transformer secondary coil are mutually in electromagnetic coupling, the string transformer primary coil is in series connection with a main transformer voltage regulating coil, and the string transformer secondary coil in series connection with the main transformer series-connection coil is connected with a wire outlet end. A rank difference voltage regulating method of the voltage regulating transformer includes the following steps that transmission voltage in the string transformer secondary coil is changed through regulating of the number of turns of the connected main transformer series-connection coil; the number of turns of the connected main transformer voltage regulating coil is regulated, so that sensing voltage in the string transformer secondary coil is changed, the sensing voltage and / or the transmission voltage are / is regulated, so that voltage of the wire outlet end of the voltage regulating transformer is changed, wherein the voltage of the wire outlet end is equal to the algebraic sum of the transmission voltage and the sensing voltage.

The invention discloses a performance test device based on an anti-ferroelectric material. The performance test device comprises a signal frequency collection circuit, a wave detection calibration circuit and a wave filtering compensation circuit, wherein the signal frequency collection circuit uses a signal frequency collector J1 with the model of SJ-ADC for collecting data signal frequency received by a control terminal in the performance test device based on the anti-ferroelectric material; the wave detection calibration circuit is divided into two paths to receive signals output by the signal frequency collection circuit; a first path uses a capacitor C2 to filter away noise of low-frequency signals; a second path uses a triode Q2 and a capacitor C3 to filter away noise in high-frequency signals; finally the first path of signals and the second path of signals are input into the in-phase input end of an operation amplifier AR3; the wave filtering compensation circuit uses an inductor L2, a resistor R17, the capacitor C7 and a capacitor C8 for forming a wave filtering circuit to filter away noise waves in output signals; then, output is performed; the signals can be subjected tofrequency modulation and voltage stabilization in real time by using data signal frequency received by the control terminal in the performance test device based on the anti-ferroelectric material; and the signal distortion is prevented.

This invention relates to a control method for storage cells used in photovoltaic merging system including solar systems from the first path to n path, in which, each path system includes a photovoltaic array, the output of which is connected with a charge circuit, the output of which is connected with a storage cell, a sample circuit is set to be connected to a load, the CPU process unit controls the charge circuits from 1 to n, a voltage current double closed loop is applied to carry out parallel control with PRI, when the voltage or current of the cell reaches to the threshold, solar energy input of certain paths is cut off / closed one by one, and when the voltage or current of the cell reaches to the maxium or minimum threshold, all of them are cut off / closed.

The application provides a power conditioning device comprising a first resistor circuit, a second resistor circuit and a control unit, wherein a DC voltage input port is connected to a grounding linethrough the serially connected first resistor circuit and the second resistor circuit; the control unit is configured to control the DC voltage input port to supply power to a digital circuit, or thefirst port between the first resistor circuit and the second resistor circuit supplies power to the digital circuit. The above manner can realize voltage regulation, provide DC voltage suitable for the circuits for different digital circuits to supply power to the digital circuits, and at the same time, reduce the manufacturing cost.

The invention discloses a serial-parallel circuit for testing ageing of multiple direct-current power supplies. The serial-parallel circuit comprises a plurality of parallel power supply rail branches and an inverter, wherein each power supply serial branch consists of a diode D for avoiding commutation between the power supply serial branches, a voltage regulator for regulating voltage of each serial branch and a plurality of serial direct-current power supplies U; series-connected positive electrodes of the direct-current power supplies U are connected with a positive electrode of a diode D; series-connected negative electrodes of the direct-current power supplies U are connected with an input end of the voltage regulator; a negative electrode of the diode D is connected with a positive electrode input end of the inverter; an output end of the voltage regulator is connected with a negative electrode input end of the inverter; an output end of the inverter is connected with a power grid. The serial-parallel circuit is simple in structure, reasonable in design, convenient in wiring, high in practicability, good in using effect and convenient to popularize and use, can realize that a plurality of small-power power supplies participate in ageing simultaneously, and realizes energy recycling during ageing test of a medium-small-power power supply.

The invention discloses a voltage source type adjusting device. The voltage source type adjusting device comprises a circuit breaker, at least two compensation units and fast mechanical switches, wherein the number of the fast mechanical switches is equal to that of the compensation units. The fast mechanical switches are correspondingly connected with the compensation units in parallel, all the compensation units are connected in series and then connected with the circuit breaker in parallel, one end of the circuit breaker is connected with the power source side, and the other end of the circuit breaker is connected with the load side. The compensation unit comprises an energy storage unit, a power conversion unit, a filtering isolating unit and a solid state switch unit, the power conversion unit is formed by a power semiconductor device and used for converting direct currents into alternating currents, the direct current end of the power conversion unit is connected with the energy storage unit, the alternating current end is connected with the primary side of the filtering isolating unit, and the secondary side of the filtering isolating unit is connected with the solid state switch unit; the solid state switch unit comprises a power semiconductor device. The voltage source type adjusting device is convenient to expand and is high in reliability. The invention further discloses a control method of the voltage source type adjusting device.

The invention relates to a temperature reduction and pressure reduction stable heat supply device comprising a controller, a conveying pipe, a steam pipe and a condensation device. A temperature reduction device, an adjustable pressure reduction device, a pressure stabilizing device, a temperature and pressure sensor and a safety valve are sequentially arranged on the conveying pipe from left to right. The outlet end of the steam pipe is inserted in the left end of the conveying pipe. The condensation device communicates with the outlet end of the safety valve. The temperature and pressure sensor is electrically connected with the controller. According to the temperature reduction and pressure reduction stable heat supply device, temperature is reduced through the temperature reduction device, pressure is reduced through the adjustable pressure reduction device, pressure is stabilized through the pressure stabilizing device, the temperature reduction and pressure reduction effect on high-temperature and high-pressure steam is good, and the steam output pressure is stable.

The invention relates to the field of industrial machineary and specifically relates to a double-fed aerogenerator. The double-fed aerogenerator comprises a wound rotor induction motor, the wound rotor induction motor is connected with a rotor-side inverter, the rotor-side inverter is connected with a network-side inverter through a DC line, the network-side inverter is connected with a power network, the power network and the wound rotor induction motor are connected, when the wound rotor induction motor rotates, energy goes into a rotor loop through the rotor-side inverter, through basic control of the network-side inverter, DC voltages are maintained constant and it is ensured that a power factor absorbed from the power network is 1, the rotor-side inverter is individually controlled, the power factor of the generator is controllable, and reactive power can be provided for the power network so as to adjust voltages of the power network.

The invention discloses a power network voltage regulation and control system and method for wind power generation. The system comprises a first reactive power compensation device, a second reactive power compensation device, a third reactive power compensation device, a first tap gear, a second tap gear, a collection device and a substation monitoring device, wherein the first reactive power compensation device is arranged on a high-voltage side bus of a regional master station connected with a wind power plant; the second reactive power compensation device is arranged on a medium-low voltage side bus of the regional master station; the third reactive power compensation device is arranged on a medium-low voltage side bus of a regional slave station connected with the regional master station; the first tap gear is located on the regional master station; the second tap gears are located on the regional slave station; the collection device is used for collecting a voltage parameter and a power factor parameter in a wind power grid; and the substation monitoring device is used for controlling the corresponding tap gears and / or reactive power compensation devices to be switched according to the voltage parameter and the power factor parameter collected by the collection device. The reactive power adjustment ability of the regional power grid is improved under the condition that a power transmission line from wind power to a substation is relatively long; and the switching frequencies of the reactive power compensation devices are reduced.

The invention relates to the technical field of sewage treatment, in particular to a sewage treatment device capable of conveniently cleaning a filter screen plate. The device comprises a sewage treatment box and a motor, a water inlet is formed in the left side of the sewage treatment box, a water outlet bin is formed in the bottom end of the sewage treatment box, and two groups of first fixing rods are fixedly connected to the top end of the sewage treatment box; and motors are fixedly mounted on the sides, close to each other, of the two first fixing rods, screw rods are fixedly connected to the output ends of the motors, and the bottom ends of the screw rods are connected with the inner wall of the sewage treatment box through second fixing rods. The sewage treatment device is providedwith a connecting plate and a hinge plate, the solid-liquid separation effect is good, sludge in sewage is extruded, and the size of the sludge is conveniently reduced; a metal filter screen and a second sliding block are arranged, then the metal filter screen can be taken out, and a user can conveniently and regularly clean the interior of the metal filter screen; and a second spring and a contact block are arranged, and thus quantitative collection of sewage is realized.

The invention relates to the technical field of sewage treatment, in particular to a sand setting device for sewage treatment. The sand setting device comprises a sand setting box body and a motor, wherein the top end of the sand setting box body is provided with a water inlet, the bottom end of the sand setting box body is provided with a sand discharging box body, the lower side of the sand discharging box body is provided with a sand discharging port, the top end of the sand setting box body is fixedly provided with the motor, the output end of the motor is fixedly connected with a rotatingshaft, the outer side of the rotating shaft is fixedly connected with stirring blades, the lower side of the rotating shaft is fixedly sleeved with a rotating plate, the right side of the rotating plate is fixedly connected with a handle, and an operation window is formed in the position, corresponding to the handle, of the inner wall of the sand setting box body. The sand setting device is provided with the rotating plate and conveying rollers, sewage is conveyed to the bottom end of the sand setting box body at a constant speed, quantitative conveying of the sewage is achieved, sand grainsat the bottom end of the sand setting box body are conveyed to the exterior of the device, and the working efficiency of the sand setting device in use is improved; and primary filtering of to-be-treated sewage is achieved through a filter screen and a fixed shaft.

The invention discloses an automobile turning alarm detection table. The detection table comprises a sound reducing enclosure and a control console; a mounting seat is arranged in the sound reducing enclosure, the control console is electrically connected with the mounting seat, and a sound level recording device is further arranged in the sound reducing enclosure; the control console comprises aprocessing module, an input module, a detection module and a display module in communication connection; the sound level recording device comprises a microphone and a sound level meter; the sound level meter is used for processing sound data collected by the microphone and forming sound information; the input module is used for inputting interval information and configuration information; the processing module is used for generating an action instruction, and sending the action instruction to the mounting seat; the detection module is used for generating failure information when the real-timesound frequency exceeds the frequency interval or the real-time sound decibel exceeds a decibel interval; and the display module is used for receiving and displaying the interval information, the configuration information, the failure information and the sound information. The sound generating effect of an alarm can be detected, and the detection table has high accuracy.

In accordance with systems and methods of the present disclosure, an apparatus may include a power converter and a controller. The controller may be configured to monitor a voltage at an input of the power converter, cause the power controller to transfer energy from the input to a load at a target current, decrease the target current responsive to determining that the voltage is less than or equal to an undervoltage threshold, and increase the target current responsive to determining that the voltage is greater than or equal to a maximum threshold voltage.

The invention discloses a low-loss electric power electronic transformer, comprising a transformer, a switch, a rectifier, first resistor to third resistor, first capacitor to third capacitor, a first diode, a second diode, a first triode, a second triode and a potentiometer. Compared with the prior art, the low-loss electric power electronic transformer disclosed by the invention can perform voltage stabilization on a low voltage power supply output by the transformer to provide a constant voltage by disposing a voltage stabilizing circuit and a rectifying circuit on the transformer, in addition, the low-loss electric power electronic transformer disclosed by the invention can also be continuous adjustable between 3-9V to meet the precise demands of the required voltage, has low low voltage transformation power consumption, reduces the current loss, saves energy and protects the environment, and has popularization and application values.

The invention discloses a DC bus pre-charging system. The DC bus pre-charging system includes a first input, a first circuit branch, a second circuit branch, and a controller. The first circuit branch includes a first contactor between the first input and the AC-to-DC converter; the second circuit branch has a disconnect switch coupled to the first input, a variable frequency driver (VFD) having an AC input coupled to the disconnect switch, an inductor coupled to an AC output of the VFD, and a second contactor coupled to the inductor. The pre-charge VFD provides precise control of pre-charge operations such as charge time, current limitation, short circuit, and ground fault protection, monitors DC bus capacitance, and verifies the health of the shared DC bus circuit by initiating diagnostics. In a first mode, the controller opens the first contactor and closes the second contactor and the open switch to pre-charge the DC bus circuit using the VFD, and in a second mode, the controller closes the first contactor and opens the second contactor and the open switch.

The invention presents an inverter and a boost control method and control device thereof, and a front-stage circuit, which relate to the field of electronic circuits. Through a front-stage circuit with a set structure, the voltage of a single-stage inverter can be adjusted. In addition, by reasonably setting the direct proportion of the inverter bridge, the voltage of the inverter can be boosted by any multiple. Through the setting of a front-stage circuit structure and an energy storage element thereof, the upper and lower bridge arms of the inverter can be directly connected without inserting dead time, the output waveform is improved, and the quality of the output voltage is improved.

The invention relates to an intelligent solar street lamp control system based on the NB-IoT. The intelligent solar street lamp control system comprises an intelligent street lamp data uploading client, a cloud server, an NB-IoT base station and a plurality of solar street lamps based on the NB-IoT, wherein the intelligent street lamp data uploading client uploads pedestrian and vehicle flow dataof a road section in each time period every day; the cloud server receives, calculates and records pedestrian and vehicle flow data of each time section of the road section in recent n days and records the pedestrian and vehicle flow data as D1, D2, D3... Dm in sequence; the cloud server sends the pedestrian and vehicle flow data to each solar street lamp based on the NB-IoT through the NB-IoT base station; and each solar street lamp based on the NB-IoT comprises a solar cell panel, a solar controller, a street lamp body and an NB-IoT controller, and all the circuit modules are connected in amatched mode. According to the invention, the brightness of the street lamp bodies can be intelligently adjusted according to the road pedestrian volume condition of each time period.

The invention provides a butt joint device and a cooling fan, and the device comprises a first butt joint structure which comprises a first metal coil suitable for being connected with a first AC wireand a first insulation shell surrounding the first metal coil; a second butt joint structure which comprises a second metal coil suitable for being connected with a second alternating current wire and a second insulation shell surrounding the second metal coil; and a metal core which is suitable for being at least partially and simultaneously arranged in the first metal coil and the second metalwire in a working state. According to the butt joint device, the metal coils is arranged in an insulating shell according to the principle of a transformer, direct contact between the conductive partsis avoided, so that the butt joint device is prevented from electric leakage due to contact between the conductive parts and the outside in the power-on process, the power utilization safety is ensured, wireless transmission of current is realized, meanwhile, the voltage of an electric wire can be adjusted, and the application range is wider.

The invention provides a voltage regulating transformer which comprises a main transformer body and a string transformer body. The main transformer body comprises a main transformer public coil, a main transformer series-connection coil and a main transformer voltage regulating coil, wherein the main transformer public coil and the main transformer series-connection coil are in series connection with a wire inlet end, and the main transformer voltage regulating coil is in electromagnetic coupling with the main transformer public coil and the main transformer series-connection coil. The string transformer body comprises a string transformer primary coil and a string transformer secondary coil, wherein the string transformer primary coil and the string transformer secondary coil are mutually in electromagnetic coupling, the string transformer primary coil is in series connection with a main transformer voltage regulating coil, and the string transformer secondary coil in series connection with the main transformer series-connection coil is connected with a wire outlet end. A rank difference voltage regulating method of the voltage regulating transformer includes the following steps that transmission voltage in the string transformer secondary coil is changed through regulating of the number of turns of the connected main transformer series-connection coil; the number of turns of the connected main transformer voltage regulating coil is regulated, so that sensing voltage in the string transformer secondary coil is changed, the sensing voltage and / or the transmission voltage are / is regulated, so that voltage of the wire outlet end of the voltage regulating transformer is changed, wherein the voltage of the wire outlet end is equal to the algebraic sum of the transmission voltage and the sensing voltage.

The invention provides a solar DC voltage increase and stabilizing type charging power supply. The solar DC voltage increase and stabilizing type charging power supply comprises a solar battery, a storage battery pack, a power-shortage protection circuit, an adjustable square wave circuit, a DC voltage increase circuit and a DC adjustable voltage stabilizing circuit which are sequentially connected; the solar battery is used for photoelectric conversion; the electricity energy produced by the photoelectric conversion of the solar battery is used for charging the storage battery pack, and the nominal voltage of the storage battery pack is 6V; the power-shortage protection circuit is used for stopping discharging of the storage battery pack when the end voltage of the storage battery pack is less than 5.7V; the adjustable square wave circuit outputs a square wave impulse signal of which the duty ratio K is adjustable and is not less than 50%; the DC voltage increase circuit increases the voltage through the resistance adjusting of a first potentiometer; the DC adjustable voltage stabilizing circuit is used for stabilizing the voltage of the DC voltage increase circuit by the synchronous adjusting of a double-link adjustable potentiometer, and the stable output voltage ranges from 10 to 230V. The solar DC voltage increase and stabilizing type charging power supply has the advantages of being applicable to charging of electronic devices with different charging voltage types, energy saving, environmentally friendly, charging on real time, and being flexible and convenient to charge.

The invention provides a gas meter capable of being passively switched in power supplying. The gas meter capable of being passively switched in power supplying comprises a control unit, or a door, a communication unit, a frequency voltage converter, a linear amplification circuit, a voltage comparison circuit and a power supply control circuit, wherein the communication unit comprises a serial port and is in communication connection with a control unit; or one input of the door is connected with the output end of the control unit, or the other input of the door is connected with the serial port end of the communication unit, or the output end of the door is connected with the input end of the frequency voltage converter, the output end of the frequency voltage converter is connected with the input end of the linear amplification circuit, the output end of the linear amplification circuit is connected with the input end of the voltage comparison circuit, and the output end of the voltage comparison circuit is connected with the input end of the power supply control circuit; and the power supply control circuit at least comprises two power supplying output ends with different voltages so as to supply power for a power utilization part of the gas meter. The voltages of the equipment at work and in idle are adjusted, so that the equipment consumption is reduced, and the cost is saved.

The invention discloses a power grid intelligent voltage regulator on-load tap machinery switch comprising a housing in a rectangle structure; a support plate is arranged on the bottom outside the housing; a wire port is arranged above the support plate of the housing; a core 1 and a core 2 are fixed in the housing via insulation supports, and respectively in an oval structure; a first level coil,a second level coil, a third level coil and a fourth level coil are arranged from left to right in sequence outside the side wall of the core1 and core 2; three light rods are arranged in middle of the core 1 and the core 2; the power grid intelligent voltage regulator on-load tap machinery switch employs an electromagnet as the power input, uses weak current for heavy current control, and the housing is filled with an inert gas, thus preventing arcing when contacts open and close, and preventing equipment fire ignition.