2403 results about "Converter circuit" patented technology

The invention relates to a V2G-based alternating current charging power adjusting method and device. The method comprises the following steps: carrying out multi-scale data acquisition and preprocessing on a V2G alternating current charging system to obtain a standardized system state data set; constructing a system dynamic model comprising a power grid voltage characteristic and a charging power characteristic; carrying out decomposition to obtain a power output mapping relation calculation, and obtaining a power modulation control parameter; establishing a fast and slow time scale coordination control framework, and designing a power regulation agent and a voltage regulation agent to obtain a coordination control strategy; checking a charging power limit value constraint, a voltage limit value constraint and a power factor constraint to obtain a constraint violation judgment result, and executing constraint projection calculation to obtain a target control instruction; and controlling a power conversion circuit of the charging pile to execute power regulation operation. According to the invention, a hierarchical control structure is adopted, the control complexity of the system is reduced, and the robustness and the adaptive ability of the control strategy are improved.

Methods and systems are disclosed for manipulating quantum data in a real quantum basis. The method comprises formulating one or more quantum circuits including an amplitude-based feature map comprising gate operations for encoding one or more input features in a Hilbert space of quantum elements of a quantum register. The gate operations are configured to encode the one or more classical input features in amplitudes of a set of orthogonal basis states of the quantum register, wherein the amplitudes are based on one or more basis functions. This also includes a method for executing a transform associated with the feature map on a quantum processor comprising a quantum register. The method comprises preparing the quantum register in a first state representing a computational basis state; formulating a transform circuit configured to map a computational basis state to a feature- map-associated basis state; and applying the transform circuit to the quantum register.

The invention belongs to the field of circuits, and provides a direct-current conversion circuit for suppressing overshoot, a switching power supply and electronic equipment. The circuit comprises a ripple injection module, a conversion module, a driving module, a feedback module, a signal detection module and a signal generation module, the conversion module is connected with the feedback module, the driving module, the ripple injection module and a load, and the feedback module is connected with the driving module and the ripple injection module. The signal generation module is respectively connected with the driving module and the signal detection module, and the signal detection module is connected with the ripple injection module. The first signal is generated through the signal generation module, the frequency of the first signal is the same as the switching frequency of the direct current conversion circuit, the first signal is detected through the signal detection module, and when the frequency of the first signal is smaller than the preset frequency, the ripple injection module is controlled to stop outputting the ripple signal; the upper tube is prevented from being started in the process that the load jumps from a heavy load to a light load, and overshoot suppression of the output voltage is achieved.

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.

The invention belongs to the field of circuits, and provides a direct current conversion circuit for enhancing transient response, a switching power supply and electronic equipment. The circuit comprises a conversion module, a comparison module, a ripple injection module, a time delay module, a driving module, a reset module and a switch module, the comparison module is connected with the conversion module, the time delay module, the ripple injection module, the switch module and a load, and the driving module is connected with the conversion module, the time delay module and the reset module. The time delay module is connected with the switch module and the reset module. When the feedback voltage is smaller than the reference voltage, namely before the upper tube is switched on each time, the switch module is controlled to be switched on, so that the first ripple signal and the second ripple signal are connected, the two ripple signals input to the comparison module do not have too large influence on loop control, and therefore in the process that the load jumps from light load to heavy load, the loop control is not influenced. Therefore, the suppression effect of injection ripples on the conduction of the upper tube can be weakened, the drop of the output voltage can be reduced, and the transient response of the circuit can be enhanced.

A linear voltage regulator includes a converter circuit that provides a serial bitstream having a pulse density that is indicative of a difference between a regulated voltage of the linear voltage regulator and a reference voltage. The linear voltage regulator also includes a digital to analog converter circuit that includes an input to receive the serial bitstream. The digital to analog converter circuit includes an averager circuit that produces an output signal to control a voltage of a control terminal of a power transistor of the linear voltage regulator for regulating the regulated voltage based on the pulse density of the serial bitstream.

An example multiphase power converter circuit includes a first power stage is configured to provide a first phase output signal at a first switching output based on a first control signal. The first power stage includes first open fault detection circuitry configured to disable detecting and / or reporting of an open fault condition responsive to the first control signal. A second power stage is configured to provide a second phase output signal at a second switching output based on a second control signal. The second power stage includes second open fault detection circuitry configured to enable detecting and / or reporting of the open fault condition responsive to the second control signal having a value to turn off the second power stage. The second open fault detection circuitry is further configured to detect the open fault condition based on a voltage at the second switching output.

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.

In a calibrated phase-locked loop (PLL), a time-to-digital (TDC) converter circuit can be calibrated to a nominal gain by a calibration circuit to achieve a desired jitter response in the PLL. The TDC circuit in the PLL measures a time difference between the reference clock and a feedback signal as a number of time increments, and the calibration circuit adjusts a resolution of the measurement by adjusting the length of the time increments (i.e., resolution). In a Vernier method employed to measure the time difference, the length of a time increment is determined by a delay difference between a first delay of a first delay circuit in a first series of first delay circuits and a second delay of a second delay circuit in a second series of second delay circuits. Adjusting the resolution of the TDC circuit includes adjusting the delay difference between the first delay and the second delay.

The invention provides a control method of a power conversion circuit and an inverter. The power conversion circuit comprises a driver, a bootstrap unit, an upper switch tube and a lower switch tube. The method comprises the steps of obtaining a target duty ratio of on-off of an upper switching tube or a lower switching tube according to the maximum loss of a bootstrap diode and the voltage of the bootstrap diode; half cycles are obtained according to the target duty ratio and the voltage of the bootstrap capacitor, and the two half cycles form a work cycle; and controlling the driver to drive the upper switch tube to be switched on at the target duty ratio in the first half period of each work period and to be switched off at the second half period of each work period, and driving the lower switch tube to be switched off at the first half period of each work period and to be switched on at the target duty ratio in the second half period of each work period, so as to charge the bootstrap capacitor. Therefore, the problem that the bootstrap diode is damaged due to overlarge impact current can be reduced.

The invention provides a photovoltaic inverter. The photovoltaic inverter comprises a shell, a circuit board and a power conversion circuit, wherein the circuit board and the power conversion circuit are located in the shell. The shell comprises a first containing cavity, a second containing cavity, a third containing cavity and a fourth containing cavity. The power conversion circuit comprises a first inductor, a bus capacitor and a second inductor which are sequentially connected in series. The bus capacitor is located in the third accommodating cavity. The first inductor and the second inductor are located in the fourth containing cavity. A terminal panel of the housing is provided with a DC input terminal and an AC output terminal. The DC input terminal extends into the first accommodating cavity and is electrically connected with the first inductor, and the AC output terminal extends into the second accommodating cavity and is electrically connected with the second inductor. When the photovoltaic inverter works, current sequentially passes through the direct-current input terminal, the first inductor, the bus capacitor, the second inductor and the alternating-current output terminal, so that the current forms an approximate C-shaped flowing path in the shell, electromagnetic interference between modules is reduced, and the electromagnetic compatibility and the working efficiency of the photovoltaic inverter with the inverted buckling type structure are improved.

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.

A pulse width modulation control circuit for controlling a power converter circuit includes: a main loop control circuit; and a light-load loop control circuit. The light-load loop control circuit includes a current synthesis circuit configured to generate a synthesized current signal according to an input voltage and a target value of an output voltage and an inductance value of an inductor in a power stage circuit of the power converter circuit. The light-load loop control circuit generates a pulse modulation signal in light-load mode according to the synthesized current signal, to control a duty ratio of the power stage circuit. In the light-load mode, the main loop control circuit enters a power-saving state to reduce the power consumption of the pulse width modulation control circuit. The power-saving state includes: reducing the power consumption of the current sense circuit or stopping the operation of the current sense circuit.

The embodiment of the invention provides a rail transit power supply system, a control method and a related device. The rail transit power supply system comprises an alternating-current bus, a direct-current bus, a transformer, a bidirectional converter and a direct-current wire inlet switch. The bidirectional converter comprises a bidirectional converter circuit with a switching tube and a direct current capacitor, and an alternating current side low-voltage switch and a controller which are connected between the transformer and the bidirectional converter circuit; the controller controls to disconnect the AC side low-voltage switch, the switch tube and the DC inlet wire switch under the condition that the AC bus loses voltage, and controls the bidirectional converter to automatically execute the grid connection process under the condition that the voltage recovery of the AC bus is detected. According to the rail transit power supply system, the control method and the related device, the workload of operation and maintenance personnel can be reduced.

The invention discloses a three-phase resonant conversion circuit, a control method thereof and electronic equipment. The control method of the three-phase resonant conversion circuit comprises the following steps: acquiring an output current and / or an output voltage of a three-phase resonant output circuit; generating a three-phase driving control signal or a two-phase driving control signal based on a first comparison result between the output current and the two-phase maximum output current and / or a second comparison result between the output voltage and the two-phase maximum output voltage; and adjusting the switching state of the three-phase switching circuit by using the three-phase driving control signal or the two-phase driving control signal so as to adjust the output voltage or the output current. By means of the mode, the control method of the three-phase resonant conversion circuit responds to the change of the output current and / or the output voltage to achieve flexible switching between the two-phase wave sending mode and the three-phase wave sending mode, so that the efficiency during light load and no load and the stability of the output voltage and the direct-current gain curve state of the output voltage are guaranteed; and the advantage of three-phase interleaved parallel connection when heavy load is taken into account or high output power is needed is considered.

Methods and systems are disclosed for manipulating quantum data in the Chebyshev basis. The method comprises formulating one or more quantum circuits including a Chebyshev feature map comprising gate operations for encoding one or more input features in a Hilbert space of quantum elements of a quantum register. The gate operations are configured to encode the one or more classical input features in amplitudes of a set of orthogonal basis states of the quantum register, wherein the amplitudes are based on one or more Chebyshev polynomials. This also includes a method for executing a Chebyshev transform on a quantum processor comprising a quantum register. The method comprises preparing the quantum register in a first state representing a computational basis state; formulating a transform circuit configured to map a computational basis state to a Chebyshev basis state; and applying the transform circuit to the quantum register.

Circuits and methods for providing a “bootstrap” power supply for level-shifter / driver (LS / D) circuits in a FET-based power converter. In a first embodiment, linear regulators and a bootstrap capacitor provide a bootstrap power supply for level-shifter / driver circuits in each tier of a multi-level FET-based power converter. In a second embodiment, floating charge circuits and bootstrap capacitors provide an improved bootstrap power supply for level-shifter and driver circuits in each tier of a multi-level FET-based power converter. More particularly, a floating charge circuit configured to be coupled to an associated bootstrap capacitor includes a first sub-circuit configured to pre-charge the associated bootstrap capacitor when coupled and a second sub-circuit configured to transfer charge between the bootstrap capacitor and a bootstrap capacitor coupled to an adjacent floating charge circuit.

A direct-current conversion circuit, which is used for providing direct-current conversion between a first direct-current voltage and a second direct-current voltage is described. The direct-current conversion circuit comprises: a transformer, which comprises a primary-side winding and a secondary-side winding, wherein the primary-side winding comprises a center tap, and a first primary-side winding and a second primary-side winding, which are respectively connected to the center tap; a primary-side circuit, wherein a first side of the primary-side circuit is connected to the primary-side winding, a second side of the primary-side circuit comprises a first end, a second end, and a third end, and a first direct-current voltage is provided between the first end and the second end of the primary-side circuit; and a secondary-side circuit, wherein a first side of the secondary-side circuit is connected to the secondary side winding.

The invention discloses a grid-connected converter based on a virtual synchronous generator technology and a control method. The grid-connected converter comprises a power conversion circuit, a filter circuit, a first state observer, a second expansion state observer and a controller, the direct-current side of the power conversion circuit is connected with a direct-current source, the alternating-current side of the power conversion circuit is connected with the first end of the filter circuit, and the second end of the filter circuit is connected with a power grid; the first extended state observer is used for acquiring a first coupling disturbance quantity related to reactive power in the active power; the second extended state observer is used for acquiring a second coupling disturbance quantity related to the active power in the reactive power; and the controller is used for decoupling the active power and the reactive power according to the first coupling disturbance quantity and the second coupling disturbance quantity. In the embodiment of the invention, the active power and the reactive power are decoupled according to the obtained first coupling disturbance quantity and the second coupling disturbance quantity, the method is simple, and the robustness of power decoupling can be improved.

The utility model discloses an AC-DC conversion circuit and a charging device, the AC-DC conversion circuit comprises a power factor correction circuit, a DC / DC conversion circuit and an auxiliary power supply circuit, the auxiliary power supply circuit comprises an auxiliary source power supply circuit, a flyback converter, a controllable switch and a control module, and the auxiliary source power supply circuit is connected in parallel between the positive output end and the negative output end of the power factor correction circuit; the flyback converter is connected in parallel with the auxiliary source power supply circuit, and the primary side midpoint is connected with the midpoint of the auxiliary source power supply circuit; one end of the controllable switch is connected with the midpoint of the output bus of the power factor correction circuit, and the other end is connected with the midpoint of the auxiliary source power supply circuit; the input end of the control module is connected with the output end of the DC / DC conversion circuit, the output end of the control module is connected with the control end of the controllable switch, and the control module is used for controlling the controllable switch to be switched off under the condition that the electrical parameters meet preset conditions. Therefore, when the charging module is in light load, voltage regulation is performed on the power factor correction circuit bus, and when the charging module is in heavy load, failure of the auxiliary source is avoided.

The embodiment of the invention provides a power transmission system and a power generation system. The power transmission system comprises: a power conversion circuit for performing power conversion on an input electric signal; the filter circuit comprises a first filter circuit and a second filter circuit, and the first filter circuit is coupled between the input end of the power transmission system and the input end of the power conversion circuit; the second filter circuit is coupled between the output end of the power conversion circuit and the output end of the power transmission system; one end of the bridging capacitor bank is coupled with the input end of the power transmission system, and the other end of the bridging capacitor bank is coupled with the output end of the power transmission system, so that a loop is formed, and interference signals in the electric signals output by the output end of the power conversion circuit can flow back to the input end of the power conversion circuit. According to the embodiment of the invention, the interference signal can flow back, the common-mode interference current at the input end and / or the output end is reduced, a safety Y capacitor does not need to be adopted, the size of the filter inductor can be reduced, and the cost is reduced.

The invention is suitable for the technical field of electronic circuits, and provides a direct current conversion circuit, a switching power supply and electronic equipment. The circuit comprises a current detection module, a driving module, a conversion module and a control module, the driving module is respectively connected with the current detection module, the conversion module and the control module, and the conversion module is respectively connected with the current detection module, the control module and a load. When the direct current conversion circuit is in a light load state and works in an intermittent conduction mode, the control module outputs a control signal according to the output voltage; the current detection module detects a first current flowing through the inductor, and outputs a first level signal when the first current is smaller than a second threshold value, so that the driving module outputs a first driving signal according to the control signal, the first level signal and the clock signal to control the conduction of the power tube; when the first current is larger than or equal to a second threshold value, a second level signal is output, the driving module outputs a second driving signal according to the control signal, the second level signal and the clock signal, and the power tube is controlled to be turned off.

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 control method of a single-stage AC / DC conversion circuit, a controller and a power supply module. The single-stage AC-DC conversion circuit comprises a primary side bridge arm switching circuit, an isolation circuit and a secondary side bridge arm switching circuit. The method comprises the following steps: acquiring an alternating current side voltage, and determining a maximum phase voltage and a minimum phase voltage based on the alternating current side voltage; and in response to a shutdown instruction, controlling the primary side bridge arm circuit corresponding to the maximum phase voltage and the primary side bridge arm circuit corresponding to the minimum phase voltage to act, so that an electrical loop is formed between the midpoints of the two bridge arms and the primary side of the isolation circuit, and the direction of the inductive current and the direction of the inductive voltage on the primary side of the isolation circuit in the electrical loop are opposite. The invention aims to realize safe shutdown of the primary side bridge arm switching circuit in the single-stage AC / DC conversion circuit and improve the safety and stability of the shutdown execution process of the single-stage AC / DC conversion circuit.

Controlling a power converter circuit for a direct current (DC) power source is disclosed. The power converter may be operative to convert input power received from the DC power source to an output power and to perform maximum power point tracking of the power source. The power converter is adapted to provide the output power to a load that also performs maximum power point tracking.

The invention discloses a medium-voltage input direct-current power supply system which comprises a phase-shifting transformer and at least one power conversion unit, the phase-shifting transformer comprises a plurality of secondary windings, each power conversion unit comprises at least one power conversion module, and each power conversion module comprises a rectifying unit and at least one direct-current conversion unit. The input end of the rectification unit is connected with one of the secondary windings, the at least one direct current conversion unit is connected to the output end of the rectification unit, each direct current conversion unit comprises a first power conversion circuit and a second power conversion circuit, the first power conversion circuit is a single-stage direct current conversion circuit, and the second power conversion circuit is a single-stage direct current conversion circuit. The second power conversion circuit is connected to the input end of the first power conversion circuit in parallel to suppress current oscillation of the input end of the first power conversion circuit, and each secondary winding is connected with a corresponding power conversion unit.

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.

Described herein is a method of operating a power electronic converter device for an electrical power conversion system. The power electronic converter device includes a converter circuit including an input side, an output side, a first converter, and at least one second converter. The second converter includes at least one floating cell with a DC intermediate circuit and semiconductor devices. The method includes: switching the semiconductor devices of the floating cell at switching instants determined with optimized pulse patterns or carrier-based pulse width modulation; determining a fundamental voltage component for the floating cell; and generating the fundamental voltage component in the actual voltage of the floating cell by modifying the switching instants, such that a voltage VC AF of the DC intermediate circuit is lying in a given reference voltage range for balancing the DC intermediate circuit of the floating cell.

The invention provides power conversion equipment. The power conversion equipment comprises a power conversion circuit, a controller, a first capacitor, a first wire and a second wire, the first wire is connected in series with a first inductor; an alternating-current output end of a first bridge arm in the power conversion circuit is connected with a first wire, a first end of a first capacitor is connected with one side of a first inductor, and a second end of the first capacitor is connected with a direct-current end of the power conversion circuit and a second wire; wherein the first wire is a live wire, and the second wire comprises at least one of a zero wire and a ground wire; the controller injects a harmonic signal of a first target frequency into a first bridge arm in the power conversion circuit, and when the voltage amplitude of a voltage signal of the first target frequency generated between the first wire and the second wire is within a first target range, information of abnormal connection of the second wire is output. Whether the zero line or the ground line is connected abnormally can be detected, the stability and the safety of power supply are ensured, meanwhile, the method is suitable for various power grid systems and power supply scenes, and the reliability is high.