17results about How to "Simple topology" patented technology

This invention discloses a voltage source static frequency converter system for pumped hydro storage and its grid-connected control method. The system includes an input reactor, a phase-shifting transformer, a high-voltage frequency converter, an output reactor, a grid-connection switch, an output switch, a signal acquisition unit, and a control unit. The input terminal of the phase-shifting transformer is connected to the power grid through the input reactor, and its output terminal is connected to the input terminal of the high-voltage frequency converter. The output terminal of the high-voltage frequency converter is connected to a motor through the output reactor. The output switch is located between the output reactor and the motor. The grid-connection switch is located between the motor and the power grid. The signal acquisition unit is used to acquire the three-phase voltage and current signals at the input terminal of the phase-shifting transformer, and the output voltage and current signals at the output side of the high-voltage frequency converter. The control unit is connected to the signal acquisition unit and is used to perform grid-connected control based on the signals acquired by the signal acquisition unit. This invention has advantages such as low cost and no motor idling during grid connection.

The application discloses a Marx high-voltage pulse power supply based on a high-gain boost type DC-DC converter, and the circuit is composed of an input DC power supply, two power switching tubes, a switching inductor and a cascaded Marx generator; the cascaded Marx generator can be expanded to n levels, and can be used in application occasions requiring high-voltage pulse power supplies, such as cancer treatment in medical treatment, water treatment, waste gas treatment, sterilization, electron and ion beam generation and acceleration, electrostatic dust removal and the like. Under the same working condition, the Marx high-voltage pulse power supply can realize high-gain pulses, and compared with the existing Marx high-voltage pulse power supply, can realize lower switching power loss and higher voltage gain. Meanwhile, the Marx high-voltage pulse power supply also has the advantages of simple topological structure, few modules, few electronic devices and low cost. Therefore, the Marx high-voltage pulse power supply has important economic value and practical engineering significance.

The invention discloses a small-size high-efficiency large-current lithium battery active equalization circuit and a control method thereof, the small-size high-efficiency large-current lithium battery active equalization circuit comprises active equalization modules which are connected in parallel between two connected battery cells, and each active equalization module is composed of four switching tubes and a group of resonance branch circuit which is formed by connecting an inductor and a capacitor in series; n-1 active equalization modules are needed for a battery pack composed of N battery cells. The LC series branch serves as an energy temporary storage unit to replace a traditional inductance type single inductor or capacitance type multiple capacitors, the number of elements is reduced, meanwhile, low-loss energy transfer is achieved through resonance characteristics, and the equalization scheme has the advantages of being small in size, large in equalization current, small in equalization energy loss between battery cells, high in efficiency and the like.

A kind of high gain magnetic integrated DC-DC converter for photovoltaic power generation system, it is characterized in that, including CDDC unit, the CDDC unit is connected with power supply V IN Connection, the CDDC unit is connected with magnetic integrated inductance unit, the magnetic integrated inductance unit is connected with fast recovery diode D3, the fast recovery diode D3 is connected with power switch tube Q1, the magnetic integrated inductance unit is connected with fast recovery diode D4, the fast recovery diode D4 is connected with output filter capacitor C3, EE magnetic core upper portion is arranged in the magnetic integrated inductance unit, EE magnetic core lower portion is arranged in the magnetic integrated inductance unit, topology structure is simple, device is less, control is convenient, especially modular design is carried out, the CDDC unit is introduced, so that system obtains higher gain, while the magnetic integrated inductance unit introduced improves the power density of converter, the application helps to promote the performance improvement of high gain magnetic integrated DC-DC converter for photovoltaic power generation system.

The application relates to the technical field of pre-charging circuits, and discloses a pre-charging circuit and a charging method, wherein the pre-charging circuit comprises a switching unit, a constant-current generating unit and a comparison control unit; the switching unit comprises an input end, an output end and a control end; the constant-current generating unit is connected in parallel with the input end and the output end, and generates a pre-charging current which is constant in size and is input to the output end when the input end and the output end are disconnected; the comparison control unit generates a control signal which is input to the control end based on the voltage difference between the input end and the output end; when in use, when initially powered on, the application provides the output end of the switching unit with a constant pre-charging current through the constant-current generating unit, guarantees that the current is constant and does not attenuate during the pre-charging process, can shorten the pre-charging time and inhibit the impact current in the initial power-on period, and protects the switching unit and the battery pack; and by adjusting the size of the pre-charging current output by the constant-current generating unit, the bus capacitor with different capacitances and the battery with different voltage grades can be adapted, and the generality is high.

The invention discloses a motor locked-rotor protection driving circuit, which relates to the field of motor locked-rotor protection, and is characterized in that a first thermosensitive detection unit and a second thermosensitive detection unit are respectively connected between two output ends of a motor and a corresponding power switch unit in series; and the control module automatically pulls down the control end of the connected power switch unit to be below a cut-off threshold value during stalling, so that a corresponding current path is cut off, and automatic stalling protection is realized. Although the scheme is realized on the basis of discrete electronic elements, a current sampling resistor, a voltage comparator and a latch logic circuit which are necessary in a traditional discrete scheme are omitted through a thermal-electric direct linkage mechanism, and self-triggering protection can be completed only through few devices such as a thermistor, a bipolar transistor and a bias resistor; according to the invention, customization limitation of a special driving chip is avoided, defects of large size, high cost and low reliability of a traditional discrete circuit are overcome, a topological structure is obviously simplified, and system cost, size and failure rate are reduced.

This invention discloses a broadband impedance measurement device for high-voltage systems and a voltage regulation method for its sub-modules. Each sub-module of the device consists of a cascaded H-bridge and a floating DC / DC converter connected in series on the DC side. One end of the cascaded H-bridge is connected to the current of each phase of the high-voltage system, and the AC side of the cascaded H-bridges in each sub-module is cascaded. The other end of the cascaded H-bridge is connected to the floating DC / DC converter. One end of the floating DC / DC converter is connected to the cascaded H-bridge, and the other end is floating. The device of this invention controls the energy balance on the bus capacitor of the cascaded H-bridge connected to the DC / DC converter in real time, so that the DC bus voltage remains stable when implementing current injection functions at different frequencies, thereby improving the impedance measurement effect. Through three-phase active and reactive power control, the energy loss on the floating side of the high-frequency DC / DC converter is compensated, a certain voltage range is maintained, and the voltage regulation and balance control effect between phases within the sub-module is improved.

An isolated bipolar output self-voltage balancing DC-DC converter, the converter comprising a forward converter, a bipolar voltage balancing unit; the forward converter comprises a DC input source u in , a power switch S1, a reset inductor L p1 , a transformer T, a reset diode D p1 , a rectifier diode D1, a freewheeling diode D2, an inductor L 1, an output capacitor C 1; the bipolar voltage balancing unit comprises a rectifier diode D3, a freewheeling diode D4, an inductor L 2, an inductor L 3, an output capacitor C 2, a voltage balancing capacitor C p The application can effectively reduce the voltage imbalance problem caused by cross regulation ratio of the traditional forward converter in bipolar output, reduce voltage deviation, and the circuit control is simple, the automatic voltage balancing of the bipolar output is realized through the bipolar voltage balancing unit, without complex sampling and control algorithm, the control system design and implementation difficulty is low, and the application is suitable for the occasions requiring bipolar voltage power supply.

The application discloses a kind of long and narrow channel-oriented wireless access device and method, device includes a plurality of sequentially connected access point units, access point unit includes: directional antenna, for realizing the signal coverage of specified channel area;Photoelectric converter group, for completing the photoelectric / electro-optical conversion of serial signal;Environment sensor, for monitoring the environment in channel;Central processing unit, for receiving, processing and forwarding data;External interface, for the connection of host computer and central processing unit, realizes data transceiving;Access point unit is connected by photoelectric converter group each other.The long and narrow channel of the application is split into multiple sections, each long and narrow channel is covered by directional antenna on wireless access device, and wireless access device is connected by optical fiber, supports multiple connection modes, designs special network configuration frame, solves the problem that existing wireless router or base station is high in cost and poor in reliability in long and narrow channel environment.

This utility model discloses a clamping absorption circuit and a DC power supply system. The clamping absorption circuit includes a boost switch K1, a buck switch K2, a first clamping absorption branch, and a second clamping absorption branch. The first clamping absorption branch includes a first diode D1, a first capacitor C1, and a first resistor R1. The first diode D1 and the first capacitor C1 are connected in series and then in parallel with the boost switch K1, forming a first node between the first diode D1 and the first capacitor C1. The first resistor R1 is connected between the first node and the positive bus. The second clamping absorption branch includes a second diode D2, a second capacitor C2, and a second resistor R2. The second diode D2 and the second capacitor C2 are connected in series and then in parallel with the buck switch K2, forming a second node between the second diode D2 and the second capacitor C2. The second resistor R2 is connected between the second node and the negative bus.

The invention discloses an all-digital phased array active silencing loudspeaker system based on storage bus multiplexing, which comprises a network digital audio acquisition module, a central processing control module, a signal distribution module and a driving array module, the network digital audio acquisition module is used for receiving a digital audio data packet from the Ethernet, performing protocol unpacking and data buffering on the digital audio data packet, recovering a high-precision global master clock signal and a frame synchronization signal from a network data stream to form a serial digital audio signal, and transmitting the serial digital audio signal to the central processing control module; the central processing control module processes the audio data to obtain a high-speed parallel bus data stream; the signal distribution module is used for receiving a high-speed parallel bus data stream and expanding the high-speed parallel bus data stream into a multi-partition array control signal; and the driving array module is used for receiving the pulse control signal and carrying out chopping modulation on the high-voltage direct-current bus through a GaN power device. According to the invention, the hardware topology is simplified, the silencing effect is optimized, and the sound wave superposition is more accurate.

This invention discloses an equivalent aggregation method applicable to networks containing new energy sources. The method preprocesses the network topology and parameter information of the network containing new energy sources. When the short-circuit current of the network containing new energy sources is a linear function of voltage, the influence of the acquired topology parameters on the short-circuit current is analyzed, and an equivalent aggregation model of the network containing new energy sources is established. Based on the type of new energy source and combined with a practical expression for the actual short-circuit current of the new energy source, the corresponding equivalent aggregation model is obtained. This method establishes an equivalent aggregation model of the network containing new energy sources based on the influence of new energy sources and network topology parameters on the short-circuit current, simplifying the network topology and reducing new energy coupling nodes. It avoids the problems of long computation time and non-convergence caused by iterative calculation of the entire new energy network and excessive network dimensions.

This invention relates to a voltage over-limit mitigation device and control method for power distribution networks. The device includes a voltage regulator and a transformer. The voltage regulator comprises three sets of switch pairs, two inductors, and two capacitors. Its input side is connected in parallel to the power supply side of the power distribution network, and its output side is connected in series to the load side via the transformer. When the device is activated, the output voltage of the AC / AC voltage regulator is calculated based on the current load voltage, the ideal load voltage, and the transformer turns ratio. The operating mode and switching control method of the AC / AC voltage regulator are determined based on the output voltage, thereby adjusting the load voltage to mitigate voltage over-limits. This invention enables flexible voltage increase and decrease regulation in power distribution networks, has strong short-circuit withstand capability, and features a simple structure, control system, and low cost.

The invention discloses a solid-state pulse power supply system of a field anti-configuration device and a time sequence control method of the solid-state pulse power supply system. The solid-state pulse power supply system comprises a multiplex load coil, and a bias branch, an ionization branch, an anti-field branch and a steady-state branch which are connected to the two ends of the coil in parallel. A main switch of each branch circuit adopts a solid-state switch element, natural follow current is realized by using a diode or a bidirectional structure in the branch circuit, and an independent follow current branch circuit is thoroughly canceled. Meanwhile, in cooperation with a microsecond time sequence control method, a steady-state branch circuit is conducted in advance to excite the reactor to form virtual impedance, and pure physical series voltage division protection is achieved. According to the invention, full time sequence multiplexing of the coil function is realized, the stray inductance, the size and the cost of the system are reduced, kHz-level repetition frequency operation can be supported, and the reliability and the stability of the field inversion configuration device are obviously improved.

This invention discloses a median filtering circuit, filtering method, and image based on the correlation of random bitstreams. The circuit includes a median filtering module, which comprises comparison and exchange modules. Based on a shared random number source, the random bitstreams operated on in the comparison and exchange modules are all positively correlated. A three-level sorting operation is used: column sorting, row sorting, and diagonal sorting. The final output is the random bitstream corresponding to the median value of the input data. The median filtering circuit of this invention is adaptable to data windows of various sizes. Furthermore, based on positively correlated random bitstreams, it significantly reduces hardware overhead while ensuring computational accuracy. It is suitable for high-performance, low-power image and signal processing systems, integrated circuits requiring data path optimization, and fault-tolerant computing.

The application discloses a power supply system suitable for superconducting magnets and a control method thereof, detects output current of a superconducting magnet, and performs difference between the output current and a pre-set current steady-state working value, and takes the difference as input of PID control; decoupling control is performed by using the pre-set current steady-state working value, current charging and discharging rate and current charging and discharging rate of another superconducting magnet, output S1 * is obtained; output S1 * is added to output of the PID control, and PWM modulation is performed on the addition result, and a drive signal of a front-stage one-way full-bridge result switch tube of an isolation type DC-DC converter is obtained. The application effectively solves the problem that two superconducting magnets are affected by self-induction and mutual induction in the charging, stable operation and discharging process, and can control the charging and discharging rates of the two superconducting magnets.