34results about How to "Simple circuit topology" patented technology

This invention relates to a boost high frequency AC/AC converter, which circuit is cascaded by an energy storage inductor, an input cycle converter, a HF transformer, an output cycle converter and an input and output filter circuit to turn a bad unstable AC current to a stable shared high grade sine AC current having the advantages of high frequency electric isolation, simple topological circuit, two stages of power transformation, two-way power-flow, high power factor at the supply side.

The invention discloses a method for estimating the remaining power of an electric vehicle power battery. The method comprises steps that based on the volume Kalman algorithm, a model for estimating the remaining power of the power battery is established; polarization internal resistance Rp(k), polarization capacitance Cp(k), equivalent ohmic internal resistance R0(k), the remaining power SOC (k)and an end voltage Ut(k) of the power battery at the time k are obtained; an open circuit voltage UOC(k) of the power battery at the time k is calculated; a state estimation error delta e(k) and a noise error V(k) are calculated; the BP neural network based on width learning is constructed, the delta e(k) and the V(k) are inputted into the BP neural network, and a variance compensation value deltaQk of process noise distribution at the time k and a variance compensation value delta Rk of observed noise distribution are outputted by the BP neural network; the delta Qk and the delta Rk are utilized to compensate Qk-1 and Rk-1 at the time k-1, and Qk and Rk at the time k are generated; a value of x(k+1) of the model for estimating the remaining power of the power battery is calculated through the volume Kalman algorithm, and the remaining power SOC (k+1) at the final (k+1) time is obtained. The method is advantaged in that the remaining power of the power battery can be rapidly and accurately estimated.

The invention relates to a simultaneous power supply flyback cycle conversion type single-stage multi-input inverter with energy storage equipment. A circuit structure of the inverter is formed by connecting multiple not-common-ground input filters and a common output isolation energy storage voltage transformation cycle conversion filter circuit by virtue of a multi-input single-output high-frequency inverter circuit with a series simultaneous selector switch, and a circuit with functions of charging the energy storage equipment and suppressing a voltage spike of a power switch is connected between two ends of a power switch of a two-way power flow single-input single-output high-frequency inverter circuit and an output end of an input filter of the nth path of energy storage equipment, wherein n is a natural number greater than 1; each input end of the multi-input single-output high-frequency inverter circuit is connected with the output end of each input filter in a one-to-one correspondence manner; the output end of the multi-input single-output high-frequency inverter circuit is connected with an input end of an energy storage type transformer of the output isolation energy storage voltage transformation cycle conversion filter circuit. A key technology is laid for realizing a small-capacity distributed power supply system with energy storage equipment.

The invention discloses a dual-motor driving system of a nine-switch inverter and a control method thereof. The system comprises two three-phase permanent magnet synchronous motors, a three-phase nine-switch inverter, a PI controller, a reference current generator, a hysteresis controller, a PWM pulse generating unit, a permanent magnet synchronous motor current detecting sensor, a Hall sensor anda direct current ( DC) power supply, wherein one end of the PI controller is connected with the DC power supply, and the other end is connected with the two three-phase permanent magnet synchronous motors through the reference current generator, the hysteresis controller, the PWM pulse generating unit and the three-phase nine-switch inverter in turn, and the permanent magnet synchronous motor current detecting sensor and the Hall sensor are respectively connected with a position and speed comparator and the reference current generator. The invention enables two permanent magnet synchronous motors to operate synchronously. According to the control topology structure and its control method, the power loss of the nine-switch inverter driven dual-permanent magnet synchronous motor is reducedby declining the number of the power switching tubes.

The invention discloses a novel soft-switching rectifier system, which comprises a full-bridge converter circuit, an output rectifier and filter circuit, a PID regulating circuit and a PWM control circuit, wherein the full-bridge converter circuit comprises a power tube Q8, a power tube Q9, a power tube Q10 and a power tube Q11; the PWM control circuit comprises a two-way input square-wave generator with a phase difference of 180 degrees, a dead-time regulating circuit, a triangular wave generator trigger circuit, a ZCS and PWM regulation circuit, a full-bridge driver and a triangular wave generator. The full-bridge driver works in a soft switching mode in a load change range; a circuit topology structure of a converter is simpler than that of other ZVZCS full-bridge PWM converter circuit; and through a proper control mode or proper parameter selection, the converter can efficiently work in a soft switching mode in the wide load change range.

The invention relates to a slope and peak integrated control circuit for an insulated gate bipolar transistor, which is characterized by comprising an insulated gate bipolar transistor, a slope and peak integrated control circuit, a gate drive circuit and a main circuit, wherein the gate of the insulated gate bipolar transistor is connected with the output end of the slope and peak integrated control circuit and one output end of the gate drive circuit in parallel; the input end of the slope and peak integrated control circuit is connected with the collector of the insulated gate bipolar transistor and one input end of the main circuit in parallel; and the other output end of the gate drive circuit is connected with the emitter of the insulated gate bipolar transistor and the other input end of the main circuit in parallel. In the invention, because resistors, capacitors, Zener diodes and other small simple components are used for forming the slope and peak integrated control circuit which is directly crossed between the collector and the gate of the insulated gate bipolar transistor, the topological structure of the circuit is simplified, and the reliability of the circuit is improved. The invention can be widely applied to various devices in the fields of electric power and electronics.

The invention relates to an isolated flyback DC chopper-type single-stage multi-input inverter for parallel time-sharing power supply. A circuit structure of the isolated flyback DC chopper-type single-stage multi-input inverter is formed by connecting multiple common-ground input filters and a common output filter circuit through a multi-input and single-output combined isolated bi-directional flyback DC chopper; each input end of the multi-input and single-output combined isolated bi-directional flyback DC chopper is connected with an output end of each input filter in a manner of one-to-onecorrespondence; and the output end of the multi-input and single-output combined isolated bi-directional flyback DC chopper is connected with the output filter circuit. The inverter has the characteristics of common-ground input sources, time-sharing power supply, electric isolation of output and input, a simple circuit topology, single-stage power conversion, high power density, high conversionefficiency, high reliability in a short circuit of load, low output capacity and a wide application prospect, and a key technology is laid for a low-capacity distributed power supply system for combined power supply of multiple new energy sources.

The invention relates to a multi-winding time-sharing power supply forward cycle conversional single-stage multi-input high-frequency link converter. A circuit structure thereof is formed by connecting multiple mutually isolated high-frequency inversion circuits with input filters and a common output cycle conversion filter circuit through a multi-input single-output high-frequency transformer; each input end of the multi-input single-output high-frequency transformer is connected with the output end of each high-frequency inversion circuit in one-to-one corresponding way; the output end of the multi-input single-output high-frequency transformer is connected with the cycle transformer input end of the output cycle conversion filter circuit. The inverter has the characteristics that the multiple input sources are in common grounding or not, the multiple input sources are in time-sharing power supply, the output and the input are in high-frequency isolation, the output cycle conversionfilter circuit is shared, the circuit topology is concise, the inverter is in single-stage power conversion, the power density is high, the conversion efficiency is high, the output voltage ripple issmall, and the application prospect is wide; and the key technology is laid for realizing a middle-small capacity distributed power supply system in joint power supply of various energy resources.

The invention provides an equivalent resistance calculation method, electronic equipment, a server and a storage medium. A connected circuit model of a circuit network is established by identifying components in the circuit network between target ports and a circuit connection relation of the components, and a matrix equation associated with electrical parameters is established according to the connected circuit model; and the electrical parameters comprise node voltage values of all nodes in the circuit network and current values flowing through components between adjacent nodes, and then equivalent resistance between target ports in the circuit network is calculated by solving the matrix equation, so that parameter analysis can be quickly and effectively carried out on the circuit network between the ports, the circuit analysis efficiency is improved, an estimation standard is further provided for subsequent circuit network optimization, and error control can be carried out while the circuit is reduced, so that the correctness of circuit simulation design is improved, the circuit design efficiency is improved, and the calculation cost is saved.

The invention relates to a multi-winding, divided power supply and forward DC chopping-type monopole multi-input high-frequency chain inverter. The circuit structure is formed by connecting a plurality of isolated input filters and a shared output filtering circuit through a combined multi-input and single-output isolation bidirectional forward DC chopper, each input end of the combined multi-input and single-output isolation bidirectional forward DC chopper is connected with an output end of each input filter in one-to-one correspondence, and an output end of the combined multi-input and single-output isolation bidirectional forward DC chopper is connected with the output filtering circuit. The inverter has the characteristics of multi-input power supply electrical isolation, divided power supply, simple circuit topology, monopole power conversion, high power density, high conversion efficiency, high output waveform quality, wide application prospect and the like, an output and an input are in high-frequency isolation, and a key technology is laid for an intermediate- and large-capacity distributed power supply system for achieving combined power supply of various new energy sources.

The invention relates to a single-stage three-phase high-frequency link combined bidirectional AC/DC converter which is formed by sequentially cascading a three-phase alternating current filter, a three-phase cycle converter, n primary side series high-frequency transformers, n output parallel high-frequency bidirectional full-bridge rectifiers and a direct current filter. The secondary side of each transformer is connected with a high-frequency bidirectional full-bridge rectifier; and the output ends of the n full-bridge rectifiers are connected in parallel. According to the single-stage three-phase high-frequency link combined bidirectional AC/DC converter, a double-current-loop direct active power partition SVPWM control strategy is adopted, direct-current-side current and alternating-current-side unit power factor control is achieved, the converter can work in a rectification and inversion mode, and a bidirectional power flow is achieved. The converter belongs to single-stage power conversion, does not have a direct-current link, solves the problems of a short service life and the like of a direct-current bus electrolytic capacitor, and improves the reliability of the converter; and the n transformer-full-bridge rectifiers with the primary sides connected in series and the secondary sides connected in parallel are combined, the capacity of the converter is improved, and the converter is suitable for high-power occasions.

A chip-to-chip communications circuit which is particularly well-suited for short range wired RF communication from one integrated circuit (chip) to another is presented. The circuits preferably utilize multi-frequency quadrature amplitude modulation (QAM) mechanisms for converting digital data bits from a parallel form into a serial analog stream for communication over a chip I/O connection. During a phase calibration cycle, a phase adjustment controller in the transmitter interoperates with a phase adjustment controller in the receiver, to adjust a phase locked-loop (PLL) circuit to correct for the phase delay arising in response to signal propagation between transmitter and receiver.

The invention discloses a lightning arrester resistor disc side glaze leakage current test system. The system comprises a variable frequency power supply module, a transformer, a reactor module, a voltage divider, a peak voltmeter, a resistor disc module, a temperature module and an oscilloscope. A low-voltage side of the transformer is connected with the variable-frequency power supply module, one end of a high-voltage side of the transformer is connected with the reactor module, and another end of the high-voltage side of the transformer is connected with the voltage divider. The reactor module comprises a series reactor. One end of the peak voltmeter is connected between a high-voltage arm and a low-voltage arm of the voltage divider. The temperature module is used for providing a corresponding temperature for the test resistor. The lightning arrester resistor disc side glaze leakage current test system provided by the embodiment of the invention can effectively prevent the interference of cutoff current, the circuit topological structure is simple, and the insulation condition of a lightning arrester can be accurately reflected.

The invention relates to a magnetic integration three-level dual-buck type half-bridge inverter. An anode of a direct-current power supply Vd1 is connected with a drain of a switch tube S1; a source of the switch tube S1 is connected with a source of a switch tube S2 and a dotted terminal of an inductor L1; a synonym end of the inductor L1 is connected with a synonym end of an inductor L2, one end of an output filter capacitor C and one end of a load R; a dotted terminal of the inductor L2 is connected with an anode of a diode D2 and a drain of a switch tube S3; a source of the switch tube S3 is connected with a cathode of a direct-current power supply Vd2; a drain of the switch tube S2 is connected with a cathode of a diode D1; a cathode of the diode D2 is connected with a source of a switch tube S4; a cathode of the direct-current power supply Vd1, an anode of the direct-current power supply Vd2, an anode of the diode D1, the other end of the output filter capacitor C, the other end of the load R and a drain of the switch tube S4 are grounded. The invention also relates to a working mode. The magnetic integration three-level dual-buck type half-bridge inverter overcomes the defects that the voltage utilization ratio is low, bridge arm output is double-polar PWM modulating wave, the voltage stress of a power device is large, and the size of the output filter capacitor is large in the prior art.

The invention relates to a high-power IGBT (insulated gate bipolar transistor) driver. A wire passes the centers of all of n transformers and serves as a primary winding for the n transformers. Each transformer comprises a secondary winding independent. Winding directions of the secondary windings are identical; the secondary windings are equal in the number of turns. The secondary windings are all connected in parallel. The secondary windings of the transformers are parallelly connected for outputting; great instantaneous output current can be provided; load carrying capacity is high; a distribution parameter is diminished; wide and narrow pushes are both considered; an IGBT can be on or off at higher speed; on and off loss of the IGBT is reduced. A drive circuit and a main circuit are isolated through the transformers; reliability of the drive circuit is greatly enhanced; damage of the drive circuit caused by failure of the main circuit is effectively prevented. Devices in secondary winding loops are all passive devices, no auxiliary power is required, the circuits are simple, fewer devices are used, circuit complexity is reduced, and parasitic interference is avoided.

The invention relates to a three-stage control system and method for a wide-range bidirectional DCDC electronic load, and is used for solving the technical problems of high test cost, low test precision and difficulty in debugging existing in a method for combining a plurality of power supply loads in a traditional power supply test. The system comprises an input stage circuit, an intermediate stage circuit unit, an output stage circuit, a first control system for controlling the input stage circuit, a second control system for controlling the intermediate stage circuit unit and a third control system for controlling the output stage circuit, the output end of the third control system is connected with the first control system. According to the method, an input-stage circuit adopts a voltage outer loop control and current inner loop control mode, an intermediate-stage circuit adopts a fixed-frequency and fixed-duty-ratio open-loop control mode, and an output-stage circuit adopts a constant-current, constant-voltage, constant-resistance and constant-power outer loop control and inductive current inner loop control mode; the input-stage circuit and the output-stage circuit are synchronously controlled, energy of the intermediate-stage circuit is automatically distributed, and bidirectional control is realized.