1369 results about "Converter circuit" patented technology

The invention discloses a high-voltage circuit for an electric flame stove. The high-voltage circuit comprises a PFC circuit, a high-frequency conversion circuit, a boosting transformer, an energy coupling circuit and a voltage doubling circuit which are electrically connected in sequence. According to the EMI filter circuit, common-mode interference and differential-mode interference are filtered out, and pure alternating current input is provided for a back-end PFC circuit; two chips are adopted in the PFC circuit, so that the PFC circuit 300 finally realizes the consistency of the current waveform and the voltage phase; in the other embodiment of the invention, double chips are adopted, so that'fault linkage protection 'is realized; stable discharging of multiple groups of positive and negative electrodes is achieved through multiple groups of single energy coupling capacitors and independent voltage doubling rectifier bridges which are connected in parallel.

The invention relates to the technical field of motor control, and discloses a permanent magnet synchronous motor control system and method for an electric drive hydraulic source, and the system comprises a data collection module which is used for collecting the state parameters of the electric drive hydraulic source and the operation data of a permanent magnet synchronous motor in real time through multiple sensors; the sensor redundancy and fault-tolerant module is used for performing parallel sampling through hardware dual-redundancy configuration and dual sensors; the self-adaptive fuzzy logic control module is used for dynamically adjusting a rotating speed instruction and a torque instruction of the permanent magnet synchronous motor based on the collected state parameters; a data driving optimization module; and a digital twinning prediction maintenance module. A self-adaptive fuzzy logic control module is used for dynamically generating a motor rotating speed and torque instruction based on parameters such as real-time pressure, flow deviation and change rate, a fuzzy logic algorithm is used for processing a nonlinear time-varying load and quick response, a self-adaptive fuzzy logic control rule weight and a power conversion circuit parameter are optimized through a reinforcement learning algorithm, and the control precision is improved. And dynamic self-optimization of permanent magnet synchronous motor control is realized.

In accordance with some embodiments of the present disclosure, a multi-level power converter circuit includes a flying capacitor, a balancing capacitor to control a voltage across the flying capacitor, a plurality of converter switches, a control switch coupled between the flying capacitor and the balancing capacitor, and control circuitry to open and close the control switch based on states of at least two converter switches of the plurality of converter switches. In some embodiments, the multi-level power converter is a three-level buck converter, and the balancing capacitor maintains a voltage across the flying capacitor to be within a threshold range of half the input voltage of the buck converter. In some embodiments, a method for operating the multi-level power converter includes using control circuitry to operate the plurality of converter switches and the control switch to selectively couple the balancing capacitor to either side of the flying capacitor.

The invention relates to an electromagnetic interference suppression method and device based on high-frequency GaN switching characteristics. The method comprises: in a power conversion circuit constructed based on a GaN switching device, edge analysis processing is performed on a driving signal of the GaN switching device to obtain edge feature data, and the edge feature data comprises a rising edge change rate and a falling edge change rate in a plurality of continuous switching periods; determining an equivalent network model constructed based on parasitic parameters in the power conversion circuit, and performing frequency domain response calculation on the equivalent network model according to the edge feature data, interference frequency band distribution information caused by the edge change is obtained, analysis processing based on spectrum energy adjustment is carried out on a driving signal of the GaN switching device according to the interference frequency band distribution information, and an adjustment control instruction used for restraining key frequency band interference is obtained. By adopting the method, an effective suppression strategy oriented to a specific interference frequency band can be realized.

The invention is suitable for the technical field of resonant converters, and provides a starting control circuit and a resonant converter. The starting control circuit comprises a feedback module, a comparison selection module and a logical operation module, the comparison selection module is electrically connected with the feedback module and the logical operation module, the feedback module is used for being electrically connected with the output end of a resonant conversion circuit in the resonant converter, and the logical operation module is used for being electrically connected with a driving circuit in the resonant converter. According to the starting control circuit provided by the embodiment of the invention, the resonant capacitor voltage constraint threshold value which is gradually enlarged along with the starting process can be constructed, smooth establishment of resonant capacitor direct current bias is realized, the fluctuation amplitude of the resonant capacitor voltage is limited, the problem that the total bus voltage is applied to the resonant inductor in a traditional scheme is avoided, and the starting control circuit is suitable for a high-voltage power supply. Finally, the resonance current peak value in the starting stage is effectively suppressed, and the impact of current stress on core devices such as a switching tube and a resonance inductor is reduced.

The invention provides a correlated double-sampling program-controlled gain amplifier for a high-energy particle detection pixel sensor and an implementation method, and solves the technical problem that a large dynamic range and high readout precision cannot be considered at the same time during existing high-energy particle detection. The circuit comprises a correlated double-sampling circuit, a signal polarity conversion circuit, an amplification feedback circuit and a configuration automatic judgment circuit. The correlated double sampling circuit is used for performing double sampling on the output voltage of the pixel signal to obtain twice sampling voltage; the configuration automatic judgment circuit is used for selecting configurations for switching according to the voltage difference between the two sampling voltages to obtain an output signal; and the amplification feedback circuit is used for performing fixed gain voltage amplification on the output signal to obtain an amplified voltage signal. The circuit can be widely applied to the technical field of integrated circuits.

The utility model discloses a single-stage and double-stage switching type circuit, which belongs to the technical field of electric energy conversion and comprises a first inductor, a second inductor, a third inductor, a three-phase rectifier bridge, a first control tube, a second control tube, a third control tube and a direct current regulation module, three input ends of the three-phase current bridge are respectively connected in series with the first inductor, the second inductor and the third inductor, and middle points of three bridge arms of the three-phase rectifier bridge are respectively connected with an input end of the direct current adjusting module after passing through the first control tube, the second control tube and the third control tube. The output end of the direct current adjusting module is connected with the load; according to the invention, the single-stage and double-stage rectification conversion circuit can be switched according to needs.

The invention discloses a charge control method and circuit applied to a resonant conversion circuit, and electronic equipment. The charge control method comprises the following steps: acquiring an input voltage and an output voltage of the resonant conversion circuit; an adjustment output signal is obtained by using an error signal between the output voltage and the benchmark reference voltage; acquiring the amplitude change rate of the input voltage; obtaining a slope compensation slope by using the amplitude change rate; performing slope compensation on the adjustment output signal by adopting the slope compensation slope to obtain a feedback adjustment signal; generating a driving control signal by using the feedback regulation signal; and the driving control signal is sent to the resonant conversion circuit to adjust the on-off state of the resonant conversion circuit so as to adjust the output voltage. Through the above mode, the charge control method provided by the invention effectively improves the dynamic performance, avoids subharmonic oscillation under extreme conditions, dynamically adjusts the slope compensation slope in real time, and further ensures the stability in a relatively wide input voltage range.

The invention discloses a battery pack activity heat recovery control method for a low-temperature environment, and particularly relates to the technical field of battery activity heat recovery control, and the method comprises the steps: deploying a sensor for a target battery pack, carrying out the monomer division of the battery pack, and collecting the parameter data of each battery pack monomer in real time; preprocessing the collected battery pack monomer parameter data, and setting a threshold value; generating a heat recovery starting instruction; generating a low-frequency alternating-current excitation signal; controlling a power conversion circuit according to the low-frequency alternating-current excitation signal, and outputting alternating current for battery pack thermal recovery; and generating a thermal recovery stop instruction according to the limitation condition of the battery pack monomer. According to the method, the problems of low heat efficiency, poor safety, insufficient control precision, weak adaptability and the like in the battery heat recovery process are solved by collecting the parameter data of the single battery pack, setting the threshold value, generating the heat recovery starting instruction, calculating the joule heat generated by the current and generating the heat recovery stopping instruction according to the limiting condition.

The present application provides a power converter, comprising: a power conversion circuit and a control circuit. The power conversion circuit comprises an inverter circuit, a DC bus capacitor and a detection circuit, and the DC bus capacitor is connected in parallel with the inverter circuit. The DC bus capacitor comprises a positive bus capacitor and a negative bus capacitor connected in series. The inverter circuit comprises a bridge arm. The detection circuit is used to detect the voltage on both sides of the positive bus capacitor, the voltage on both sides of the negative bus capacitor and the output current of the bridge arm. The control circuit is used to control the bridge arm to switch from outputting two levels to outputting three levels within one switching cycle in response to preset conditions. The preset conditions are conditions based on the voltage of the positive bus capacitor, the voltage of the negative bus capacitor and the output current of the bridge arm. The present application uses a hybrid modulation of three levels and two levels, so that the power converter can achieve a balance between the quality of power output and power consumption, thereby improving the performance of the power converter.

The present application provides an on-board charger and a control method thereof. Since the transformer side of the AC / AC conversion circuit is connected to the AC side of the AC / DC conversion circuit via a transformer, the on-board charger has a single-stage structure. Furthermore, since the instantaneous sampling value of the grid-side current is equal to its instantaneous reference value when stable, and the instantaneous reference value of the grid-side current is determined by the phase of the instantaneous sampling value of the grid-side voltage and the reference peak value of the grid-side current, the on-board charger has a PFC function. Furthermore, since the battery-side charging power can be indirectly controlled by controlling the grid-side current, the on-board charger has a battery-side voltage and current control function. Furthermore, since phase shift control is performed on the two conversion circuits, and the phase shift control enables soft switching of the power devices in the two conversion circuits, and the single-stage structure reduces the current flowing through the devices, efficiency is improved. Therefore, the single-stage structure efficiently implements the PFC and battery-side voltage and current control functions of the two-stage isolated on-board charger.

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 present application relates to high speed, high efficiency SiC power modules. A power converter module includes an active metal brazing (AMB) substrate, a power converter circuit, and an enclosure. The AMB substrate includes an aluminum nitride base layer, a first conductive layer on a first surface of the aluminum nitride base layer, and a second conductive layer on a second surface of the aluminum nitride base layer opposite the first surface. The power converter circuit includes a plurality of silicon carbide switching components coupled to each other via the first conductive layer. The enclosure is disposed over the power converter circuit and the AMB substrate. By using an AMB substrate with an aluminum nitride base layer, thermal dissipation of the power converter module can be significantly improved while maintaining structural integrity of the power converter module.

A power system 1 includes a power converter 6 and a control device 8. The power converter 6 includes a first converter circuit 71 including switching legs 61, 64 and a second converter circuit 72 including switching legs 62, 63. The control device 8 operates the power converter 6 under any one control mode among a charging mode for charging a high-voltage battery B by causing the converter circuits 71, 72 to operate as a PFC converter, a power feeding mode for feeding power to an external AC load EL by causing the second converter circuit 72 to operate as an inverter, and a power feeding during charging mode for feeding power to the external AC load EL while charging the high-voltage battery B by causing the first converter circuit 71 to operate as the PFC converter and causing the second converter circuit 72 to operate as the inverter.

The application discloses a single-stage three-phase high-frequency isolation type conversion circuit and a closed-loop control method. The single-stage three-phase high-frequency isolation type conversion circuit generates a modulation ratio and a vector angle on the basis of synchronous control of a fundamental wave and a harmonic wave of a three-phase current based on three-phase voltage of a three-phase three-wire power grid and the three-phase current of the three-phase three-wire power grid, generates a primary side driving signal and a secondary side driving signal according to the modulation ratio and the vector angle, the primary side driving signal is used for driving a three-phase matrix converter, and the secondary side driving signal is used for driving a full-bridge inverter. The fundamental wave and the low-frequency harmonic wave of the power grid current can be synchronously controlled, low-order harmonics can be eliminated, the sinusoidal degree of the grid-connected current can be improved, and thus the quality of the power grid current and total harmonic distortion can be improved.

The invention provides a DC-DC forward boost-buck power conversion circuit based on cascaded Cuk topologies, and relates to the technical field of power electronic conversion, the circuit is mainly formed by cascading two Cuk topologies sharing one inductor, and the circuit also comprises a power supply end, a load end and a same-frequency driving signal generator. The same-frequency driving signal generator controls the two power switch tubes in the Cuk topology through a same-frequency signal, and the output voltage is adjusted by adjusting the duty ratio. The circuit not only keeps the advantage of continuous input and output current of a traditional Cuk circuit, but also converts the polarity of the output voltage from the reverse direction to the forward direction, and meanwhile, the voltage gain is remarkably improved, so that forward voltage conversion can be efficiently and smoothly realized. The circuit structure has the characteristics of high gain, forward output, continuous current, simple control and the like, and is suitable for occasions requiring high-efficiency and high-quality electric energy conversion, such as new energy power generation and energy storage, electric automobiles, precision industry and the like.

The invention discloses a bidirectional single-stage alternating current-direct current converter, which belongs to the field of alternating current-direct current electric energy conversion and comprises a low-frequency rectifying circuit, a high-frequency resonant conversion circuit, a voltage-multiplying conversion circuit and a three-phase alternating current, and the low-frequency rectifying circuit, the high-frequency resonant conversion circuit and the voltage-multiplying conversion circuit are sequentially connected. A low-frequency side adopts a Swiss rectifier, a high-frequency side adopts a Sigma-LLC circuit and two groups of three-phase LLC parallel high-frequency resonant conversion circuits, and all devices adopt switching tubes to ensure bidirectional flow of power.

The invention provides an insulation detection method and device of a photovoltaic system, a controller and the photovoltaic system. The method comprises the following steps: detecting whether the photovoltaic system has an insulation fault; if the photovoltaic system has the insulation fault, determining the position of the insulation fault in the fault photovoltaic string according to the ratio of the voltage to ground of the first pole of the photovoltaic system to the open-circuit voltage of the photovoltaic string; the first electrode is any one of a direct-current bus positive electrode and a direct-current bus negative electrode; and respectively and independently controlling the positive and negative electrodes of the input end of each direct current conversion circuit to be short-circuited, and for each MPPT module, determining whether the insulation fault position is located in the MPPT module based on the change of the voltage to ground of the first electrode before and after the short circuit of the MPPT module. According to the photovoltaic system insulation fault detection method and the photovoltaic system insulation fault detection device, insulation faults from a system level to a component level can be spanned, additional devices are not needed, manpower, time and economic cost required by field troubleshooting is reduced, and the detection efficiency of the photovoltaic system insulation faults is improved.

The invention discloses a flyback conversion circuit, which comprises N flyback conversion sub-circuits and an input power supply circuit, and is characterized in that the input end of each flyback conversion sub-circuit is connected with the output end of the input power supply circuit; the flyback conversion sub-circuit comprises an input filter capacitor, a clamping capacitor, an output filter circuit, an active absorption circuit and M power conversion circuits; the first input end of the active absorption circuit is connected with the first end of the clamping capacitor, the second input end of the active absorption circuit is connected with the first end of the input filter capacitor or the second end of the input filter capacitor, and the first output end of the active absorption circuit is connected with the first input end of the output filter circuit. The second output end of the active absorption circuit is connected with the second input end of the output filter circuit. By adopting the design of multi-path staggered conduction control and unified energy absorption, the power conversion efficiency and power density of the circuit can be effectively improved, the voltage stress of the device is reduced, and the electromagnetic compatibility is improved.

The present invention provides a dynamic current-sharing technology based on series capacitor charge balancing and a three-phase series capacitor Buck converter device thereof, belonging to the field of power electronics. This control method ensures that the three-phase series capacitor Buck converter maintains good steady-state accuracy while rapidly responding to sudden changes in load current. This control method simplifies and solves the problem of ensuring that all state variables reach new steady-state values ​​simultaneously at the end of a transient process when implementing charge balancing control in a three-phase series capacitor Buck converter. This control method offers the advantages of a constant switching frequency, independence from converter circuit parameters, zero steady-state error, and rapid load transient response.

The invention provides a power supply conversion device and a vehicle-mounted charger, and relates to the technical field of AC-DC conversion design, the power supply conversion device comprises a matrix switch circuit comprising at least one bridge arm circuit, and the first ends of the at least one bridge arm circuit are connected in parallel to form the first end of the matrix switch circuit; the second ends of the at least one bridge arm circuit are connected in parallel to form the second end of the matrix switch circuit, each bridge arm circuit comprises an upper bridge arm unit and a lower bridge arm unit, and the input end of the matrix switch circuit is connected with the alternating current side port; the primary side first end of the isolation circuit is connected with the first output end of the matrix switch circuit, and the primary side second end of the isolation circuit is connected with the second output end of the matrix switch circuit; the first midpoint end of the voltage conversion circuit is connected with the secondary side first end of the isolation circuit, and the second midpoint end of the voltage conversion circuit is connected with the secondary side second end of the isolation circuit. The efficiency and the power density of the single-stage AC-DC conversion circuit can be improved, and the system structure is simplified.

A transceiver system includes a signal generator and controller circuit, a first signal converter circuit, an attenuator circuit, and a second signal converter circuit. Signal generator and controller circuit generates a transmitting baseband signal. First signal converter circuit generates a transmitting radio frequency signal according to transmitting baseband signal. Attenuator circuit generates an attenuated radio frequency signal according to transmitting radio frequency signal. Second signal converter circuit generates an attenuation range baseband reference signal according to attenuated radio frequency signal. Signal generator and controller circuit determines a first attenuation range for attenuator circuit according to attenuation range baseband reference signal when transmitting baseband signal is a dual-tone signal, and determines a second attenuation range from first attenuation range for attenuator circuit according to attenuation range baseband reference signal when transmitting baseband signal is a single-tone signal, and second attenuation range is for a pre-distortion process.

The invention discloses a speed measurement system of a hot-wire anemometer and a control method thereof, and the system comprises a bridge sensor module which comprises a bridge comprising a detection resistor, and when the resistance value of the detection resistor changes along with the wind speed, the voltage difference value of the output end of the bridge is larger than a difference value threshold value; the analog-to-digital conversion circuit is used for converting a voltage analog signal output by the bridge output end into a digital signal; the central processing module is connected with the analog-to-digital conversion circuit and is used for receiving the digital signal and generating a feedback signal based on the digital signal; and the digital-to-analog conversion circuit is used for converting the feedback signal into a bridge top voltage analog signal, inputting the bridge top voltage analog signal to the bridge, and adjusting the bridge top voltage of the bridge to enable the voltage difference value to be smaller than or equal to the difference value threshold value. According to the system, active closed-loop adjustment is realized through a high-speed digital signal processing mode, and compared with a previous negative feedback hot-wire anemometer, the stability of the system is improved, the requirements on the performance of system components are reduced, the anti-electromagnetic interference capability is improved, and measurement errors caused by environmental factors are reduced.

A power converter circuit is disclosed. The power converter circuit includes: a first regulated power converter having a first input and a first output; and a second regulated power converter having a second input and a second output. The inputs are configured to be coupled to a source, and the outputs are configured to be coupled to a load. The inputs are coupled in series; the outputs are coupled in parallel. The first regulated power converter is a regulated hybrid converter configured to transfer energy from the first input to the first output through at least one magnetic component and at least one capacitive component.

A neural processing unit may be provided. The neural processing unit may comprise a controller circuit configured to select an activation function processing method among a first method or a second method, according to an activation function included in a neural network model, a programmed activation function execution unit (PAFE unit) configured to execute a programmed activation function (PAF) that approximate the activation function and output a first activation value, and a converter circuit configured to convert the first activation value and output a second activation value. In the first method, only the PAFE unit may operate. In the second method, both the PAFE unit and the converter may operate.

The invention discloses an AC-DC common-ground AC-DC converter with a bipolar DC voltage balancing function, which belongs to the technical field of power electronic conversion and comprises a first converter circuit and a second converter circuit which are interconnected. The relation between direct-current voltages E1 and E2 and a power grid voltage vg is detected through a control circuit, and a boost mode, a buck mode or a voltage equalizing mode is dynamically switched in a power frequency positive / negative half cycle, so that automatic balance of the bipolar direct-current voltage is realized. According to the invention, an AC-DC common-ground structure is adopted to suppress common-mode leakage current, and the circuit is especially suitable for occasions requiring a bipolar DC power supply, such as an LED illumination system, and has the advantages of high efficiency and low ripple.

The present invention discloses an AC-DC converter with a common ground and a bipolar DC voltage balancing function, belonging to the field of power electronic conversion technology, comprising a first converter circuit and a second converter circuit interconnected. The DC voltages E1 and E2 are detected by a control circuit and the grid voltage v g The present invention utilizes a common AC / DC ground structure to suppress common-mode leakage current, making it particularly suitable for applications requiring a bipolar DC power supply, such as LED lighting systems, and offering the advantages of high efficiency and low ripple.

The invention relates to a relay detection method applied to a power conversion device. The method comprises the following steps: outputting a first driving signal to the power conversion circuit, wherein the first driving signal is used for controlling the power conversion circuit to output power to the first live wire output end; acquiring a first inverter voltage of the output end of the first live wire; under the condition that the first inversion voltage reaches the target voltage, the zero line relay and the first live wire relay are controlled to be closed; after the zero line relay and the first live wire relay are closed, stopping outputting the first driving signal; and obtaining a first network side voltage of the first live wire input end and a first inversion voltage of the first live wire output end to determine fault detection results of the zero line relay and the first live wire relay. According to the method, faults of the zero line relay and the first live wire relay of the power conversion circuit can be correctly detected, and the reliability of the power conversion circuit is greatly improved.

The invention provides an isolation conversion circuit, an isolation conversion circuit control method, a controller and a vehicle-mounted charger. The isolation conversion circuit comprises a transformer isolation assembly which comprises a primary winding and a secondary winding, and the primary winding is provided with a first end, a second end and a primary tap arranged between the first end of the primary winding and the second end of the primary winding; the primary side bridge arm switching circuit is respectively connected with the power supply end, the first end of the primary side winding and the second end of the primary side winding; a secondary bridge arm switching circuit; the first switching circuit is respectively connected with the power supply end and the primary side tap and is used for connecting / disconnecting a path between the power supply end and the primary side tap; when the first switching circuit is in a conducting state, the primary side bridge arm switching circuit is used for carrying out push-pull on the voltage of the power supply end through the first switching circuit and then carrying out inversion output; and when the first switching circuit is in the off state, the primary side bridge arm switching circuit is used for inverting and outputting the voltage of the power supply end. The invention aims to reduce the size of the whole machine.