1504 results about "Bridge circuit" patented technology

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 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 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 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 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.

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.

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 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 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.

The single-phase bidirectional single-stage isolation matrix converter comprises a pre-stage circuit and a post-stage circuit, and the pre-stage circuit comprises an LC filter on the power grid side, a pre-stage single-phase matrix conversion circuit and an LLC resonance circuit with a high-frequency transformer; the post-stage circuit comprises a post-stage conversion circuit and an output filter capacitor; the front-stage single-phase matrix conversion circuit comprises four bidirectional switch assemblies of a full-bridge structure. Each bidirectional switch assembly comprises two unidirectional controllable MOS tubes which are reversely connected in series, one end of each bidirectional switch assembly is connected to an L line or an N line of a power grid, and the other end of each bidirectional switch assembly is connected to the LLC resonance circuit. The rear-stage conversion circuit comprises a bidirectional MOS (Metal Oxide Semiconductor) tube bridge circuit and three high-frequency transformer secondary windings which are in triangular connection or star connection; and two end points of each secondary winding are respectively connected to the upper MOS tube and the lower MOS tube of the corresponding bridge arm and then are connected to output positive and negative ends. The converter has the advantages of high power density, low current harmonic, high power factor and the like, and is small in size, strong in anti-interference capability, wide in buck-boost range, and safe and reliable in commutation.

The invention discloses a twelve-beam six-dimensional force sensor, and relates to the technical field of force sensing. The sensor effectively solves the problem of coupling interference in six-dimensional force measurement by optimizing the structural design of the elastic body, innovating the bridging mode of the strain gauges and accurately positioning the patches, and improves the measurement precision and stability. The sensor is of a twelve-beam elastomer structure, stress distribution under different loads is analyzed through COMSOL finite element simulation software, and the position of a strain sensitive area is determined; a group bridge circuit is designed through tension and compression strain characteristics of the symmetrical strain beams, and decoupling is achieved from the hardware level; mEMS silicon strain gauges are selected and accurately assembled, so that the measurement error is further reduced. Experimental data show that the crosstalk rate of the sensor under loads of all dimensions is as low as 2%, net output signals are stable, and the sensor can be widely applied to the fields of robots, precision manufacturing, aerospace and the like with high requirements on force measurement precision.

The invention relates to a high-precision temperature detection system based on an alternating-current impedance bridge. The high-precision temperature detection system comprises a double-resistance bridge circuit, a lock-in amplifier and a differential circuit, the double-resistor bridge circuit comprises a resistive temperature sensor and a standard resistor which are connected in series, and the phase-locked amplifier is a digital phase-locked amplifier realized based on an FPGA (Field Programmable Gate Array). Wherein the initial potential of a first voltage measurement end arranged at the midpoint of the double-resistor bridge circuit is zero by adjusting the two excitation signals which are loaded to the double-resistor bridge circuit and have the same frequency and opposite phases before temperature measurement; in the temperature measuring process, the lock-in amplifier detects the potential of the first voltage measuring end and the voltage at the two ends of the standard resistor through the differential circuit, then the resistance value of the resistance-type temperature sensor is calculated by combining the resistance value of the standard resistor, and then the temperature of the resistance-type temperature sensor is reduced. According to the invention, the anti-interference capability can be improved, and the measurement precision of 0.1 mK level can be reached near 273K.

The invention discloses a half-bridge ZVS Buck-Boost converter and a control method thereof, and belongs to the technical field of power converters, the half-bridge ZVS Buck-Boost converter comprises a primary side conversion module, a voltage transformation module and a secondary side conversion module, and the primary side conversion module, the voltage transformation module and the secondary side conversion module are connected in sequence; the primary side conversion module comprises a first bridge arm, a second bridge arm, a first inductor and a bidirectional switch, the first bridge arm and the second bridge arm are connected in parallel, a bridge arm midpoint of the first bridge arm is connected with a first end of the first inductor, a second end of the first inductor is connected with a first end of the voltage transformation module, and a second end of the voltage transformation module is connected with a second end of the voltage transformation module. The second end of the voltage transformation module is connected with the bridge arm midpoint of the second bridge arm, the bridge arm midpoint of the first bridge arm is connected with the first end of the bidirectional switch, and the second end of the bidirectional switch is connected with the bridge arm midpoint of the second bridge arm. According to the invention, zero-voltage switching-on of the half-bridge circuit switching tube in a full-input, full-output and full-load range under a constant switching frequency can be realized.

The invention relates to the technical field of three-phase power dynamic optimization double-phase output control, in particular to a three-phase power dynamic optimization double-phase output control method and device. The method comprises the following steps: collecting line voltage and load current signals of a three-phase power supply; identifying the load type according to the characteristics of the load current signal; determining a health degree evaluation value of each line according to the load type and the harmonic distortion rate and the voltage fluctuation rate of each line voltage; selecting the line with the optimal health degree evaluation value as a selected line; if it is determined that the health degree evaluation value of the selected line meets a preset safety condition, outputting a two-phase voltage including the selected line; and if the preset safety condition is not met, synthesizing two-phase voltage through a bridge circuit and outputting the two-phase voltage.

The utility model relates to a crosstalk suppression driving circuit of a silicon carbide MOSFET bridge circuit and power supply equipment. The crosstalk suppression driving circuit comprises an upper bridge driving module, an upper bridge crosstalk suppression module, a lower bridge driving module and a lower bridge crosstalk suppression module. The upper bridge driving module is respectively connected with the upper bridge crosstalk suppression module and the upper bridge arm, and the upper bridge crosstalk suppression module is also connected with the upper bridge arm; the lower bridge driving module is connected with the lower bridge crosstalk suppression module and the lower bridge arm, and the lower bridge crosstalk suppression module is further connected with the lower bridge arm. Each crosstalk suppression module and the corresponding bridge arm share a turn-off signal and a turn-on signal, and there is no need to additionally add a detection or control circuit to control the crosstalk suppression module. Each crosstalk suppression module is connected with the corresponding bridge arm in the turn-off process of the corresponding bridge arm, so that the forward driving crosstalk and the negative driving crosstalk of the silicon carbide MOSFET can be suppressed; and each crosstalk suppression module is automatically disconnected with the corresponding bridge arm before the corresponding bridge arm is conducted, so that the conduction loss of the bridge arm can be reduced, and the circuit efficiency is prevented from being reduced.

An electric apparatus includes a rotary electric machine, an electric power control unit, and an AC electric power source connection portion. The rotary electric machine includes a stator core on which a slot shared by a β-phase first coil and a β-phase second coil is formed. The electric power control unit includes: a third full-bridge circuit and a fourth full-bridge circuit that are connected to each of both ends of each β-phase coil; and a third connection-disconnection device and a fourth connection-disconnection device that are connected between each of one end of each β-phase coil and each full-bridge circuit. The AC electric power source connection member is connected to both ends of each connection-disconnection device such that magnetic fluxes are cancelled each other when a current supplied from an external AC electric power source to the β-phase coils that are magnetically coupled flows.

The invention discloses a BUCK-BOOST multi-stage half-bridge circuit series aging topological structure and a control method, and in the topological structure, a front-stage BUCK circuit and a rear-stage BOOST circuit are symmetrically designed by taking a voltage-stabilizing energy-storage capacitor as a center; the pre-stage BUCK circuit comprises a plurality of BUCK half-bridge units which are cascaded in sequence, and the post-stage BOOST circuit comprises a plurality of BOOST half-bridge units which are cascaded in sequence; the BUCK half-bridge unit and the BOOST half-bridge unit have the same circuit structure and each comprise an upper bridge arm and a lower bridge arm; in the BUCK half-bridge unit, an upper bridge arm switch and a lower bridge arm switch are connected to the output end of the upper stage, and an inductor L and the negative end of a lower bridge arm are connected to the input end of the lower stage; in the BOOST half-bridge unit, the inductor L and the negative end of the lower bridge arm are connected to the output end of the upper stage, and the upper bridge arm switch and the lower bridge arm switch are connected to the input end of the lower stage. According to the invention, cascade aging of BUCK and BOOST is realized, the aging efficiency is greatly improved, the energy loss is reduced, the cost is saved, the cascade aging is closer to system operation, the verification is more sufficient, and the working condition coverage is larger.

The application discloses a single-stage bidirectional power conversion topology structure capable of realizing wide-range soft switching and a control method thereof. The bridge-in and bridge-between 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 soft switching of a wide voltage variation range is realized by real-time adjustment of a switching frequency according to the size of a port voltage. The bridge arm current connected with the primary side of a second transformer is the sum of the primary side current of the second transformer and the inductance current connected with the primary side of the second transformer in parallel. By designing the inductance value of the parallel inductance connected with the primary side of the second transformer, the bridge arm current connected with the primary side of the second transformer can be effectively changed, so that the soft switching realization range of the switching tube of the bridge arm connected with the primary side of the second transformer under the wide power transmission range can be expanded.

The invention relates to the technical field of large-deformation displacement meters, in particular to a resistance strain type sensitive element for a large-deformation displacement meter and application of the resistance strain type sensitive element. The structure of an elastic sensitive part is optimized, and a first arc-shaped section and a second arc-shaped section can be used for buffering when the elastic sensitive part is impacted in the testing process; the impact resistance, vibration resistance and stability of the elastic sensitive part are improved, so that the service life is prolonged, meanwhile, the resistance strain sensitive element for the large-deformation displacement meter adopts a full-sealed structure, and the influence of the external environment on the test precision is further reduced; the structure of the resistance strain gauges is optimized, the resistance strain gauges are arranged on the upper side and the lower side of the straight section to form a full-bridge circuit, the consistency of strain changes in the pulling direction and the pressing direction when the elastic sensitive part is stressed is ensured, and the consistency of output in the pulling direction and the pressing direction is improved; meanwhile, the zero setting grid is additionally arranged, so that the zero point output performance of the resistance strain type sensitive element for the large-deformation displacement meter can be compensated, and the influence of external environment change on the test precision is reduced.

An electric apparatus includes: an electricity storage device; a rotary electric machine including an α-phase first coil and an α-phase second coil; and an electric power control unit that controls electric power transfer of each of the electricity storage device and the rotary electric machine. The electric power control unit includes: a first full-bridge circuit connected to both ends of the α-phase first coil; and a second full-bridge circuit connected to both ends of the α-phase second coil. When electric power is transmitted via the α-phase first coil and the α-phase second coil between the first full-bridge circuit and the second full-bridge circuit, the electric power control unit controls a phase difference between the first full-bridge circuit and the second full-bridge circuit in a range that includes 90° to 180°.

The utility model provides a half-bridge drive interlocking circuit, in which a logic circuit is provided with a logic gate; two input ends of the logic circuit respectively receive two control signals; the two control signals are in one-to-one correspondence with two switch tubes in the half-bridge circuit; when the two control signals are turn-on signals, the two output ends of the logic circuit output turn-off signals. A first output end of the logic circuit is connected with a control end of a first switching tube in the half-bridge circuit through a first driving circuit; a second output end of the logic circuit is connected with a control end of a second switching tube in the half-bridge circuit through a second driving circuit; namely, the logic circuit is built through the logic gate, the phenomenon of high-temperature attenuation caused by the adoption of an optical device is avoided, the logic circuit is not affected by the high-temperature environment, good performance stability can still be kept in the high-temperature environment, the signal transmission efficiency is high, and the driving accuracy and the reliability and safety of the system are improved.

A laptop computer including a first casing, a first sub-circuit board, an input module, a second casing, a motherboard, and a bridge circuit board is provided. The first sub-circuit board is disposed at the first casing. The input module is disposed at the first casing and electrically connected to the first sub-circuit board. The motherboard is disposed at the second casing. The first casing and the second casing are assembled together, such that the first sub-circuit board, the bridge circuit board, and the motherboard are partially overlapped, and the first sub-circuit board is electrically connected to the motherboard via the bridge circuit board.

The invention relates to a method for the open- / closed-loop controlling of a stepper motor. The stator windings of the stepper motor are controlled via a full-bridge circuit with switching elements. The switching elements can be controlled in such a way that a rapid-decay mode or a slow-decay mode can be set. A charge cycle time in a pulse width modulation (PWM) period is stored, and the rapid-decay mode or the slow-decay mode for the next PWM period is set according to the charge cycle time. The invention additionally relates to a control unit, and a stepper motor comprising the full-bridge circuit and the control unit.

The invention relates to the field of intelligent control, and particularly discloses a brushless motor control circuit for a high-temperature double-control water distributor, which comprises an MCU (Microprogrammed Control Unit) control circuit, a gate drive circuit, a current detection circuit, a three-phase H-bridge circuit and a high-temperature direct-current brushless motor, wherein the current detection circuit is electrically connected to the three-phase H-bridge circuit to collect real-time current and input the real-time current to the MCU control circuit, and the MCU control circuit judges the position of a rotor based on the real-time current and outputs a PWM control signal based on the position of the rotor; wherein the PWM control signal output by the MCU control circuit drives the high-temperature direct-current brushless motor through the gate drive circuit and the three-phase H-bridge circuit.

A control unit (50) controls a primary-side full-bridge circuit (30) and a secondary-side full-bridge circuit (40) such that one of the primary-side full-bridge circuit (30) and the secondary-side full-bridge circuit (40) applies a two-level voltage to a transformer unit (TS) and the other applies a three-level voltage to the transformer unit (TS). The control unit (50) controls the primary-side full-bridge circuit (30) and the secondary-side full-bridge circuit (40) such that a first phase difference, a second phase difference, the frequency of the two-level voltage, and the frequency of the three-level voltage are a combination that can output a required power and that satisfies condition 1 and condition 2.