1956 results about "Bridge circuit" patented technology

The invention discloses a single-stage bidirectional power conversion topological structure capable of realizing wide-range soft switching and a control method of the single-stage bidirectional power conversion topological structure. In-bridge and inter-bridge phase shift control of a double-half-bridge circuit and a high-frequency switch matrix provides a basis for realizing soft switching of all power tubes; the switching frequency is adjusted in real time according to the magnitude of the port voltage, soft switching within a wide voltage change range is achieved, the current of a bridge arm connected with the primary side of the second transformer is the sum of the primary side current of the second transformer and the current of an inductor connected in parallel with the second transformer, and the inductance value of the inductor connected in parallel with the primary side of the second transformer is designed. The current of the bridge arm connected with the primary side of the second transformer can be effectively changed, so that the soft switching implementation range of the switching tube of the bridge arm connected with the primary side of the second transformer in a wide power transmission range can be expanded.

The invention discloses an unmanned aerial vehicle hybrid power supply system energy management method based on fuzzy double closed-loop control in the technical field. An unmanned aerial vehicle hybrid power supply system comprises a hydrogen fuel cell, a lithium battery and a double active bridge circuit, and the hydrogen fuel cell and the lithium battery serve as energy sources of the hybrid power supply system; the dual-active bridge circuit is used for connecting a hydrogen fuel cell and a lithium battery and transmitting energy to an unmanned aerial vehicle load, the energy management method comprises a fuzzy power control outer ring and a fuzzy PI current control inner ring, the fuzzy power control outer ring dynamically distributes power according to a power signal required by the unmanned aerial vehicle load, a power error signal and a lithium battery charge state, and the fuzzy PI current control inner ring controls the power to be output. The fuzzy PI current control inner loop generates an accurate driving signal according to the battery power and the voltage ratio after fuzzy distribution, a switching device of the dual active bridge circuit is driven to be switched on, energy transmission is achieved, and the problems that in existing unmanned aerial vehicle energy management, the cruising ability is insufficient, and the energy utilization efficiency is low can be effectively solved.

The invention relates to the technical field of power conversion, and discloses an intelligent power converter system based on adaptive load regulation and a control method thereof. Comprising a power converter body, a plurality of sockets of different types are arranged on the power converter body, and a load sensing sensor, a micro-control unit, a step-down circuit and a bridge circuit are arranged in the power converter body; the load sensing sensor is electrically connected with the micro-control unit and is used for monitoring the power requirement of equipment connected with each socket in real time and transmitting a corresponding monitoring signal to the micro-control unit; the micro-control unit is electrically connected with the step-down circuit and the bridge circuit, and is used for controlling the step-down circuit and the bridge circuit to adjust output voltage and current according to a monitoring signal transmitted by the load sensing sensor; the micro-control unit controls the step-down circuit and the bridge circuit to automatically adjust the output voltage and current of the corresponding jacks according to the equipment power requirement monitored by the load sensing sensor, so as to realize the self-adaptive load adjustment of each jack.

The invention discloses a multi-objective optimization method and system for dual active bridge circuit expansion phase shift modulation, and the method comprises the steps: calculating a voltage matching ratio, and determining an external phase shift angle ratio based on a difference value between an output voltage and an output voltage reference value; according to the voltage matching ratio and the external phase shift angle ratio, obtaining an internal phase shift angle ratio of the primary side full bridge through an offline lookup table; calculating the maximum transmission power of the dual-active bridge converter, and determining a current working mode from the six preset working modes based on the size relationship between the inner phase shift angle ratio and the outer phase shift angle ratio; generating an optimal modulation strategy through a multi-objective optimization algorithm by taking the current effective value and the current peak value as optimization objectives and combining the voltage matching ratio and the periodic parameters of the current working mode; and generating a trigger signal of each switch tube of the dual-active bridge converter. Through six-mode working area division, complete differential algorithm boundary constraint and off-line-on-line collaborative optimization, the contradiction between the current stress and the soft switching range of the converter under extended phase shift modulation is solved.

The invention belongs to the technical field of mechanical test tool equipment, and particularly relates to an electro-hydraulic speed regulator test testing device. Comprising the steps that a virtual diesel engine model generates a signal and supplies the signal to a rotating speed controller, an alternating current power supply supplies power to a frequency converter to drive a motor to operate, and the rotating speed of the motor is transmitted to an electro-hydraulic speed regulator through a first coupler to drive a main pump in the electro-hydraulic speed regulator to build pressure; a hydraulic bridge circuit in the electro-hydraulic speed regulator acts to drive the output shaft to rotate, the output shaft transmits an output signal back to the virtual diesel engine model through the flywheel, the magnetic powder brake and the angle sensor, and the virtual diesel engine model feeds back the signal to the magnetic powder brake through the brake controller; and the output torque of the electro-hydraulic speed regulator is ensured to meet the operation requirement and is confirmed by the torque sensor. The electro-hydraulic speed regulator test device has the advantages that the electro-hydraulic speed regulator test device is provided with the outer circulation oil way, and the test requirements of various electro-hydraulic speed regulators can be met.

The power supply conversion circuit includes an isolation transformer, and the isolation transformer includes at least two primary coils and at least one secondary coil. Each primary coil is connected to a half-bridge circuit by using a first resonant network, and half-bridge circuits corresponding to the at least two primary coils are connected in series between two electrodes of a power supply. The half-bridge circuit is connected in parallel to a voltage divider, the voltage divider includes a first capacitor and a second capacitor that are connected in series, a first terminal of the first resonant network is connected to an intermediate node of the half-bridge circuit, and a second terminal of the first resonant network is connected to a connection point between the first capacitor and the second capacitor.

A half-bridge driver circuit periodically repeats switching cycles by closing a first FET via a first drive signal, detecting an instant when a current flowing through the first FET reaches a threshold and then opening the first FET and closing a second FET via a second drive signal. An error amplifier generates a control voltage by comparing a feedback signal with a reference signal, and a variable current generator generates a first current as a function of the control voltage. The error amplifier includes a proportional-integral controller, and a slope compensation circuit that generates a second current as a ramp signal. The threshold is generated by subtracting the second current from the first current. In response to detecting the instant, the second current is sampled and a signal indicative of the threshold is generated by subtracting the sampled second current from the first current.

A power tool is provided including a power supply interface receiving a removable battery pack, a brushless direct current (BLDC) motor including a rotor and a stator, and a multi-phase inverter bridge circuit. A controller is provided to output drive signals to the inverter bridge circuit to control flow of current from to the motor, where each drive signal is activated within each corresponding phase of the motor within a conduction band. The controller is configured to control a length of the conduction band at a variable value within a first torque range below a torque threshold and at a substantially constant value within a second torque range above the torque threshold. The torque threshold is greater than approximately 1 Newton-meters and the motor produces a maximum power output of at least approximately 1250 watts at the torque of approximately 1 Newton-meters.

The invention belongs to a transformer structure, and provides a direct-current transformer, a power transmission system and a control method of the power transmission system in order to solve the technical problems that a three-level circuit topology in a power module in an existing direct-current transformer is large in number of power devices, complex in structure and large in layout and wiring difficulty. Each power module comprises a first-stage circuit, a second-stage circuit, two first direct-current bus capacitors and two second direct-current bus capacitors, the two first direct-current bus capacitors are connected in series to form a first capacitor circuit, and the two second direct-current bus capacitors are connected in series to form a second capacitor circuit. The first-stage circuit comprises two first half-bridge circuits which are connected in series, and the second-stage circuit is a dual-active bridge converter based on a series half-bridge. The number of power devices is remarkably reduced, meanwhile, the layout and wiring difficulty of the whole circuit is simplified, and popularization and application of the direct-current transformer are easier.

The invention relates to the technical field of power distribution automation auxiliary power supply control, and discloses an intelligent power distribution circuit system for a digital ring main unit, which comprises a transient voltage gradient induction bridge circuit, a hardware signal processing circuit, a power switch unit and a controlled energy release unit, according to the system, a transient voltage gradient induction bridge circuit is used for collecting a primary side bus voltage change rate signal, a hardware signal processing circuit carries out derivation operation on an induction signal and compares the induction signal with a voltage gradient threshold value, and a power switch unit is blocked at the moment that the voltage abnormally drops so as to cut off a load current path. According to the invention, a hardware parameter direct mapping mechanism is utilized to realize microsecond transient protection response, and the physical decoupling of protection logic and digital software is realized by balancing bus potential pulse caused by sudden unloading of a load through the inherent dehumidification resistor in the multiplexing cabinet.

The invention belongs to the related technical field of photovoltaic inverter compensation systems, and particularly relates to a high-power-quality converter with chopping inversion multiplexing, which comprises series and parallel APFs (active power filters), a Z-type grounding transformer, a three-phase bridge circuit and a photovoltaic power generation unit, one end of the transformer is connected to the alternating current side of the bridge circuit, the other end of the transformer is externally connected with a load power grid, a grounding point is led out to be connected to one end of the photovoltaic power generation unit while the transformer is connected to the alternating current side, and the other end of the photovoltaic power generation unit is connected to the bridge circuit; the series APF and the parallel APF form a unified power quality controller and are connected between the transformer and the bridge circuit; the parallel APF is used for compensating voltage sine distortion and voltage imbalance in the presence of an inversion working condition, and the series APF is used for filtering harmonic current and compensating reactive power in the presence of the inversion working condition; and the transformer is used for providing a grounding reference for the photovoltaic power generation unit in the presence of a chopping working condition and offsetting a zero-sequence harmonic component of the alternating current side voltage in the presence of an inversion working condition.

A power receiving device performs a power supply control including repeatedly performing: first rectification mode in which in response to detection of an energization of a first bridge circuit, a first high-side and a second low-side switches are turned on and a first low-side and a second high-side switches are turned off; and second rectification mode in which in response to detection of an energization of a second bridge circuit, the first low-side and the second high-side switches are turned on and the first high-side and the second low-side switches are turned off, and a power adjustment control including: first commutation mode in which the first high-side switch is turned off and the first low-side switch is turned on during the first rectification mode; and second commutation mode in which the second high-side switch is turned off and the second low-side switch is turned on during the second rectification mode.

The invention discloses a bridge and a bridge circuit thereof, the bridge circuit comprises an SPI interface, a bridge conversion chip, an isolation circuit, an enable circuit and a UART interface, the SPI interface is coupled and electrically connected with the bridge conversion chip, and the SPI interface is also electrically connected with an SPI interface of a host of a battery management system. A data port of the bridging conversion chip is coupled and electrically connected with the UART interface through an isolation circuit, the bridging conversion chip is further electrically connected with a data sending port of the UART interface through a corresponding enable circuit, the UART interface is further electrically connected with a UART interface of the AFE, and the host is used for configuring configuration parameters for the UART interface to communicate with the preset AFE; the SPI interface is used for transmitting an SPI signal between the host and the bridging conversion chip; the bridging conversion chip is used for converting UART signals and SPI signals; the isolation circuit is used for carrying out noise interference isolation on the UART signal converted by the bridging conversion chip; the enabling circuit is used for enabling a data sending port of the UART interface; and the UART is used for transmitting a UART signal between the AFE and the bridging conversion chip.

The invention relates to an external phase shift angle determination method and system, a frequency conversion phase shift control method and a chip, and the method comprises the steps: obtaining an external phase shift angle based on a general solution of a time domain differential equation of a resonant inductor current and a resonant capacitor voltage of a DBSRC equivalent circuit and the symmetry of the DBSRC equivalent circuit; determining a first current value of the resonant inductor at the first moment and a second current value of the resonant inductor at the second moment; based on the first current value when the primary bridge circuit meets the ZVS soft switching requirement, obtaining a first relational expression of the external phase shift angle about the input voltage and the output voltage of the DBSRC and the switching frequency of the switching tube; based on a second current value when the secondary-side bridge circuit meets the ZVS soft switching requirement, obtaining a second relational expression of the external phase shift angle with respect to the input voltage, the output voltage and the switching frequency; according to the first relational expression, the second relational expression and the steady-state voltage value of the output end of the DBSRC, the expression of the external phase shift angle about the switching frequency, the steady-state voltage value and the input voltage is determined; the scheme is simple, the accuracy is high, and the portability is high.

The invention relates to the field of tension and pressure sensors, in particular to a tension and pressure sensor with a compensation function, which comprises an elastic body, a strain gauge, a compensation gauge and a wiring terminal, the strain gauge and the compensation gauge are respectively arranged on the surface of the elastic body, the strain gauge, the compensation gauge and the wiring terminal are electrically connected through a plurality of high-temperature-resistant cables to form a bridge circuit, at least the strain gauge and the compensation gauge are respectively limited in the first heat insulation layer and the protection layer, and the first heat insulation layer is located between the elastic body and the protection layer. At least a first heat insulation layer used for protection, heat insulation, pressure resistance and sealing is used for wrapping a strain gauge and a compensating gauge which are packaged by a polyimide film and can resist the high temperature of 260 DEG C, so that the actual temperature of the strain gauge and the compensating gauge has a remarkable temperature difference with the current environment temperature; the actual temperature of the strain gauge and the compensating gauge is obviously lower than the environment temperature, so that the strain gauge and the compensating gauge are respectively in an ideal temperature range, and the force measurement precision of the pull pressure sensor is ensured.

The invention discloses a bridge arm short-circuit fault detection method, a trailer protection method and device and a vehicle. The method comprises the steps that a motor controller of the vehicle carries out bridge arm fault or overcurrent fault detection; and when the motor controller detects the bridge arm fault or the overcurrent fault and is in a shutdown state, determining whether the motor controller has the bridge arm short circuit fault or not based on three-phase current in a three-phase bridge circuit of the motor controller. According to the method, the device and the vehicle, bridge arm fault or overcurrent fault detection is performed on the motor controller, whether the bridge arm short circuit fault exists in the motor controller or not is judged according to the three-phase current, the bridge arm short circuit fault can be detected by utilizing an existing universal hardware scheme, and the method is high in universality, simple and reliable in identification and high in reliability. The method is suitable for bridge arm short-circuit fault detection of various motor controllers, and extra hardware cost is not needed.

A voltage source multi-level converter topology and a control method thereof. The voltage source multi-level converter topology includes two groups of half-bridge circuits, two groups of flying capacitors and a plurality of switches. Each group of half-bridge circuits include two direct-current connection ends, and outputs of the two groups of half-bridge circuits are both connected, through a switch, to the two groups of flying capacitors that are in series. A neutral point of a connection between the two groups of flying capacitors is connected to an alternating-current end through two switches that are in reverse series, and an overall positive electrode and an overall negative electrode of the two groups of flying capacitors that are in series are respectively connected to the alternating-current end through switches.

A magnetic sensor device includes a magnetic sensor, a die pad, and four leads. The magnetic sensor includes a bridge circuit including a plurality of arms and a plurality of pads electrically connected to the bridge circuit. One of the plurality of arms is provided between one of the plurality of pads and a different one of the plurality of pads in circuit configuration. The magnetic sensor further includes a sub-pad electrically connected between one end and another end of the one arm and also electrically connected to the die pad.

A hydrogen detection device includes a bridge circuit including: a hydrogen sensor that is a first resistive element; a resistor that is a second resistive element; a reference element that is a third resistive element; and a resistor that is a fourth resistive element, and at least the hydrogen sensor and the reference element are provided on a single semiconductor chip. The hydrogen sensor includes a first electrode, a second electrode, a metal oxide layer, an insulating film, or the like, and the insulating film includes an opening through which part of the second electrode is exposed. The reference element includes a first electrode, a second electrode, a metal oxide layer, an insulating film, or the like, and the insulating film includes no opening through which part of the second electrode is exposed.

A full-bridge power converter is provided. The full-bridge power converter includes a transformer circuit, an input-side circuit, an output-side circuit, and a controller. The input-side circuit includes an input-side full-bridge circuit and an input inductor. The input-side full-bridge circuit includes multiple power switches. The input inductor is coupled between a positive power terminal of the battery module and the input-side full-bridge circuit. The output-side circuit includes an output-side full-bridge circuit and an output capacitor. The controller turns on the power switches during a first period, causing the transformer circuit to release an electric energy stored in the transformer circuit. The controller turns on the power switches during a second period after the first period, and controls the output-side full-bridge circuit to precharge the output-side full-bridge circuit by using an energy stored in the output capacitor.

The invention provides a soft switching control method, device and system of a converter and a readable storage medium, and the method comprises the steps: calculating a first modulation parameter of the converter, and generating a plurality of first target driving signals based on the first modulation parameter, so as to control the connection or disconnection of a corresponding first target switching tube through each first target driving signal, the closed-loop control of the output voltage and the input current of the converter is realized; calculating a second modulation parameter of the converter after closed-loop control based on the first modulation parameter; wherein one of the first modulation parameter and the second modulation parameter is a modulation ratio, and the other one is a phase shift ratio; generating a plurality of second target driving signals based on the second modulation parameter; wherein the driving signal corresponding to the modulation ratio is used for controlling each switching tube of the matrix circuit to be switched on or switched off, and the driving signal corresponding to the phase shift ratio is used for controlling each switching tube of the full-bridge circuit to be switched on or switched off. By implementing the scheme of the invention, soft switching of all switching tubes within a full voltage range and a full load range can be realized.

The invention discloses a high-power alternating-current impedance excitation circuit, a control method thereof and an electrolysis test system, and belongs to the technical field of power supplies and power electronics, the circuit is used as an alternating-current power supply in a high-capacity electrolysis test power supply, and the circuit is controlled by a controller to output an alternating-current signal so as to carry out an impedance test on an electrolytic bath. Compared with a full-bridge circuit, the alternating-current impedance excitation circuit adopts the multi-level converter, so that the output current harmonic content is low, the electrolysis efficiency is improved, the equipment loss is reduced, the economical efficiency of an electrolysis system is improved, stable operation of an electrolytic bath is ensured, and electrolysis interruption or faults caused by voltage fluctuation are reduced.

A measurement circuit and method for direct-current side insulation impedance to earth of a converter. The measurement circuit for direct-current side insulation impedance to earth of a converter comprises: a controller, a bridge circuit and a direct-current side insulation impedance measurement assembly. The bridge circuit comprises an upper bridge arm power switch transistor group (1) and a lower bridge arm power switch transistor group (2). The direct-current side insulation impedance measurement assembly comprises a converter direct-current bus voltage source (3), a power inductor (4) and a matching resistor (5), a direct-current bus positive electrode (6) of the converter direct-current bus voltage source being electrically connected to the upper bridge arm power switch transistor group (1), and a direct-current bus negative electrode (7) being electrically connected to the lower bridge arm power switch transistor group (2). After being connected to the power inductor (4) in series, one end of the matching resistor (5) is connected to the middle point of the bridge arm between the upper bridge arm power switch transistor group (1) and the lower bridge arm power switch transistor group (2), and the other end of the matching resistor (5) is connected to a grounding end (8). The upper bridge arm power switch transistor group (1) and the lower bridge arm power switch transistor group (2) are further connected to the controller. The measurement circuit can reduce the cost of measuring the direct-current side insulation impedance.

A semiconductor package includes a base substrate, an interposer package disposed on the base substrate, and first and second semiconductor chips disposed on the interposer package, the interposer package includes a first redistribution layer, a bridge chip including a bridge circuit, and a vertical connection structure including a plurality of wiring layers, and wherein each of the first semiconductor chip and the second semiconductor chip is electrically connected to the bridge circuit and the plurality of wiring layers through the first redistribution layer.

The invention provides a braking rotating device with a power generation function, a self-powered rotating system, a control method and a wire cup, and the braking rotating device comprises a stator part which comprises three groups of coils arranged at intervals in the circumferential direction; the rotor part rotates coaxially with the stator part and comprises a plurality of magnets which are arranged at intervals in the circumferential direction and have alternately changed polarities; the self-power-generation brake part generates power based on rotation of the rotor part relative to the stator part and performs brake control on the rotor part based on a received brake signal, the self-power-generation brake part comprises a three-phase rectifier bridge circuit, and three phase current ends of the three-phase rectifier bridge circuit are respectively connected with the three groups of coils; at least one phase of the three-phase rectifier bridge circuit is provided with a switching device, at least one phase of the three-phase rectifier bridge circuit is not provided with a switching device, and when an enabling end of the switching device receives a brake signal, a phase current end of the phase where the switching device is located and a common anode or a common cathode of the three-phase rectifier bridge circuit are conducted.

The invention discloses a control method and system for a single-stage three-port V2G charging device, and relates to the technical field of charging pile converters, and the method comprises the steps: constructing a structure of a three-port converter, and obtaining a working mode of the converter; a phase shift control mode is adopted between the ports and between the two bridge arms of the full-bridge circuit; bidirectional power flow of energy between a power grid and a new energy automobile battery is completed, and multifunctional charging and discharging management is achieved. The converter is of a single-stage structure and has high power density, and flexible and bidirectional power exchange between alternating current and direct current ports can be achieved without a two-stage structure. In order to improve the efficiency of the converter, a phase shift angle is calculated by taking power as a constraint condition and taking current stress and soft switching as optimization targets, a three-port converter optimization modulation strategy which is suitable for the topology and takes a wide soft switching range and low current stress into account is designed, and efficient and reliable operation of the converter in three working modes of V2G, G2V and H2L can be realized.

The embodiment of the invention discloses a multiplex type three-stage starting power generation controller, and relates to the technical field of aviation three-stage starting power generators. In the starting stage, an H-bridge inverter in the starting power generation controller provides single-phase alternating-current exciting current for a main exciter stator exciting winding through SPWM modulation so as to establish a pulsating magnetic field to provide exciting current for a main motor, and a three-phase full-bridge inverter provides armature current for a main motor stator armature winding through SVPWM modulation. In a power generation stage, an anti-parallel diode of the three-phase full-bridge inverter is used as a rectification circuit of the auxiliary exciter, and the H-bridge inverter adopts a PWM chopping mode to operate as an asymmetric half-bridge circuit. A power generation controller and a starting controller are integrated into a whole, and by changing the modulation mode of a hardware circuit, the control function of the three-stage starting generator at different stages can be realized by only one controller, so that the structure of the starting power generation controller is simplified, the system integration degree of the three-stage starting generator is improved, and the volume and the weight of the system are reduced.

An output node of a high-side driver circuit 220 is connected to a gate of a high-side transistor MH. The high-side driver circuit 220 is operable in a first mode in which the high-side driver circuit 220 outputs a drive current IHG_ON of a first current amount in a first period after a high-side control signal HGCTL transitioned from off-level to on-level, and outputs, in a second period following the first period, a drive current of a second current amount less than the first current amount.

The present application relates to a converter control method, a converter, and a chip. The converter comprises an alternating-current side half-bridge circuit and a controller, and the method is used in the controller. The converter control method comprises: when the alternating-current side half-bridge circuit satisfies a zero-crossing switching condition, switching the control mode of the alternating-current side half-bridge circuit from a first mode to a second mode, wherein the second mode comprises: switch devices located on a same bridge arm are turned on in a preset sequence or turned off in a preset sequence, and corresponding switch devices located on different bridge arms are complementarily turned on. The converter control method has high reliability.

The invention discloses a novel high-frequency three-phase H-bridge inversion parallel re-topology and a modulation method thereof, each phase in a three-phase inverter adopts one or more parallel single-phase full-bridge topologies, and each single-phase full-bridge topology comprises a direct-current bus part, an MOS module part, a differential-mode inductor part and a common-mode rejection part; the direct current bus part is a bus capacitor plate, the MOS module part is a full-bridge circuit, the differential mode inductor part comprises two differential mode inductors, and the common mode rejection part comprises a common mode inductor. A unipolar frequency doubling and carrier phase shift PWM (Pulse Width Modulation) mode is adopted, each full-bridge topology adopts unipolar frequency doubling modulation, modulation wave phase shift modulation is adopted between the full-bridge topologies, the phase difference is 360 / N, and N is the number of full-bridge circuits connected in parallel. According to the scheme, the purpose of increasing the output power, the switching frequency and the level number can be achieved.