21 results about "Boost chopper" patented technology

The invention discloses an alternating current and direct current compatible air conditioner circuit and a design method thereof, the circuit comprises a control unit, and a switching circuit and a boost chopper circuit which are respectively connected with the control unit, the switching circuit comprises a first switching circuit and a second switching circuit, and the boost chopper circuit comprises a first boost chopper circuit and a second boost chopper circuit; the first switch circuit and the first boost chopper circuit are respectively connected with a photovoltaic module, the second switch circuit and the second boost chopper circuit are respectively connected with a power system, outputs of the first boost chopper circuit and the second boost chopper circuit are arranged in a matched manner and are connected in parallel to jointly supply power, and the control unit is connected with the photovoltaic module based on dynamic power distribution logic. The first boost chopper circuit boosts the voltage of the photovoltaic module and the second boost chopper circuit boosts the voltage of the power system by controlling the switching on and switching off of the first switching circuit and the second switching circuit respectively.

The utility model relates to the field of unmanned aerial vehicles, and provides a converter for a fuel cell of an unmanned aerial vehicle, which comprises a boost chopper circuit and a half-bridge resonant circuit, the boost chopper circuit is connected with the half-bridge resonant circuit in parallel, and the boost chopper circuit comprises a direct current power supply a, a fly-wheel diode a, a full-control device a, an inductor a, a capacitor a and a resistor a, the positive electrode of the direct-current power supply a is connected with the inductor a, the inductor a is respectively connected with the fly-wheel diode a and the full-control device a, the fly-wheel diode a is respectively connected with the capacitor a and the resistor a, and the full-control device a, the capacitor a and the resistor a are connected with the negative electrode of the direct-current power supply a. When in use, the unmanned aerial vehicle has the advantages of high efficiency, stability, small size, energy conservation, environmental protection and the like, the space and the weight of the unmanned aerial vehicle are saved, the stability and the control precision of the unmanned aerial vehicle are enhanced, and stable flight of the unmanned aerial vehicle and normal operation of equipment are ensured.

The invention discloses a multipath parallel current-sharing high-frequency auxiliary power supply system based on ADRC-PI double closed loops, which comprises an LCL filter and a power supply system, and is characterized in that the LCL filter is connected with the power supply system, and the power supply system comprises a plurality of devices arranged in parallel; wherein each device comprises a boost chopping module, an inversion module, a diode uncontrolled rectification module and a Buck module, and the system adopts double-loop control of voltage outer loop-current inner loop combination for the boost chopping module of each device. An ADRC is designed as a voltage outer ring and a PI is designed as a current inner ring, and an automatic current sharing strategy is added to control the output voltage of the boost module and the current sharing condition between multiple paths of equipment; and the inverter module and the Buck module adopt a fixed duty ratio to control the output power of the power supply to be matched with the power required by the load. According to the invention, the output power quality and transient performance of the multi-path parallel current-sharing high-frequency auxiliary system are improved.

To suppress efficiency deterioration and discharge power stored in a capacitor without adding any element for power discharge.SOLUTION: A power source device includes a bidirectional step-up / step-down chopper including a first capacitor, a first switching element, a second switching element, an inductor, a third switching element, a fourth switching element, and a second capacitor, and a control unit that controls the bidirectional step-up / step-down chopper. To discharge power stored in the first capacitor, the control unit controls the third switching element to be turned off, controls the fourth switching element to be turned on, and controls the first switching element and the second switching element to be alternately turned on and off.SELECTED DRAWING: Figure 1

The invention relates to the technical field of power electronic devices, in particular to a boost inversion device of a following grid type offshore wind turbine generator and a control method. The three-phase rectifier bridge and the Boost chopper circuit are adopted to form the light topological boost rectifier module, an electrolytic capacitor for stabilizing direct current voltage is not needed, the topological structure of the boost rectifier module is simplified, the first control module adopting MPPT + PFC cooperative control is constructed, mutual cooperation is achieved in a capacitor-free scene, and the power supply efficiency is improved. Maximum power tracking and power factor correction functions are achieved, and the problems that in the prior art, a large-capacity electrolytic capacitor needs to be relied on to maintain voltage stability, and consequently the size of a system is increased, and the service life is shortened are solved. Moreover, the post-stage current source type inverter is directly connected to the power grid, and a single current loop tracking mode is utilized, so that the technical problem that the voltage endurance capability of a power device in the system is relatively high on the basis of relatively high direct current bus voltage in the prior art is solved.

When a secondary battery is charged, a switch is closed, and a first boost chopper circuit, a second boost chopper circuit, and a totem-pole bridgeless power factor correction circuit, which are coupled in parallel to each other, are driven to operate in an interleaving manner, and in this state, an alternating-current voltage inputted from an AC input terminal is converted into a direct current, and the direct current is outputted from a direct current output terminal. When alternating current is outputted using an AC output terminal, the switch is closed, and the totem-pole bridgeless PFC circuit is used, and in this state, a DC voltage from the secondary battery is converted into an alternating current, and the alternating current is outputted from the AC output terminal.

A power supply device (1) is provided with: a backup power supply (10); a motor drive unit (12) that drives an in-vehicle electric motor (2); a first step-up unit (11A) having a step-up chopper circuit (40) that operates on the basis of the input voltage, the first step-up unit (11A) boosting the backup power supply voltage (Vbu) to a first voltage (Vbst1), and outputting the first voltage (Vbst1) to the motor drive unit (12); and a second step-up unit (11B) that steps up the backup power supply (10) to a second voltage (Vbst2) and outputs the second voltage (Vbst2) to the first step-up unit (11A) as the input voltage of the step-up chopper circuit (40).

The application discloses an intelligent charging circuit, which comprises a power supply circuit part and a main control circuit part; the power supply circuit part comprises an AC input circuit and a DC output circuit; the AC input circuit comprises a step-down conversion circuit and a full-bridge rectification filter circuit; the DC output circuit comprises a power management chip U1, a switch tube Q and a boost chopper circuit; the main control circuit part comprises a main control chip U0 and a main circuit; the main circuit comprises a voltage regulating circuit with a controllable voltage stabilizing source chip U2 as the main body, a current regulating circuit with a double operational amplifier chip U3 as the main body and a photo-coupler U4; a PWM modulation voltage signal output terminal and a PWM modulation current signal output terminal of the main control chip U0 are connected with a voltage input terminal and a current input terminal of the main circuit respectively; and the application further discloses an intelligent charging method based on the above intelligent charging circuit. The application can charge batteries with various specifications, and realizes automatic adjustment and control of the charging voltage and the maximum allowed charging current in the charging process.

The invention provides a high-speed maglev train boost chopper fault diagnosis method based on depth time sequence modeling. The method comprises the following steps: organizing original sampling data of a multivariable time sequence of an actual operation platform of a boost chopper system of the high-speed maglev train by adopting a sliding time window mechanism, and generating a category equalization time sequence sample set; performing periodic pattern analysis on the time sequence sample to obtain a dominant periodic sequence; the method comprises the following steps: performing nonlinear transformation and residual connection processing on a time sequence sample by using a two-dimensional remolding mechanism through a TimesNet module to obtain a deep feature sequence, and predicting category probability distribution of an operation state of a boost chopper system of a high-speed maglev train through nonlinear activation, regularization, flattening operation and full-connection mapping processing. According to the invention, fault diagnosis of the boost chopper can be realized under complex operation conditions, and an efficient and reliable technical scheme is provided for state monitoring and safe operation of the high-speed maglev train boost chopper.

This invention provides a method and apparatus for constructing a short-scale transient simulation model of a computing center, relating to the field of computing center modeling technology. The method includes: modeling the power grid side using a three-phase AC voltage source; modeling the uninterruptible power supply using a series-connected three-phase full-bridge rectifier circuit, a boost chopper circuit, and a three-phase bridge PWM inverter circuit, wherein the boost chopper circuit has energy storage elements for powering the computing center during grid-side faults; modeling the cooling module using a constant torque load; modeling the server using CPU power consumption, GPU power consumption, total server power consumption, and server variable impedance; and modeling the ZIP load using a ZIP model. This invention can more effectively describe the interaction between the computing center and the power supply system, providing a new modeling approach for the energy efficiency optimization and stable operation of computing centers.

The invention provides a power converter of photovoltaic energy storage equipment and the photovoltaic energy storage equipment. The power converter of the photovoltaic energy storage equipment comprises a plurality of photovoltaic power transmission circuits, each photovoltaic power transmission circuit is connected with a photovoltaic assembly, and each photovoltaic power transmission circuit comprises a first switch tube and a boost chopper circuit; the first end of the bus capacitor is connected with the first output end of the boost chopper circuit, the positive electrode of the battery and the first end of the alternating current port, and the second end of the bus capacitor is connected with the second output end of the boost chopper circuit, the negative electrode of the battery and the second end of the alternating current port. When the working voltage of the photovoltaic module is greater than the battery voltage, the first switch tube is in a closed state; and when the working current of the photovoltaic module is greater than the preset current value, the first switching tube is in an off state. The energy conversion efficiency is improved.

The present application provides a wireless maintenance network system and method for a boost chopper. The system comprises: a boost chopper, comprising a control panel and a wireless client, the control panel communicating bidirectionally with the wireless client; a wireless access point establishing a wireless link with the wireless client of the boost chopper; and a vehicle control unit and an operation and maintenance server communicating bidirectionally with the wireless access point via Ethernet. This system simplifies the body wiring and post-maintenance of maglev trains, enables real-time status monitoring and fault diagnosis of boost choppers, and supports the download of large amounts of service data, enabling rapid software upgrades.

The application discloses a turn ratio optimization method of integrated three-phase Boost-LLC topology, comprising the following steps: obtaining a positive peak value and a negative peak value of a Boost chopper inductance current; obtaining an effective value of the chopper inductance current according to the positive peak value and the negative peak value; obtaining resonance current peak values of a Boost primary side and a secondary side; obtaining resonance current effective values of the primary side and the secondary side according to the resonance current peak values; calculating inductance values under different turn ratios when an output voltage is fixed; and obtaining a turn ratio with minimum loss according to the effective value of the chopper inductance current, the resonance current effective values and the inductance values under different turn ratios. The application solves the problem that the turn ratio in the integrated three-phase Boost-LLC topology is difficult to be scientifically and efficiently designed.

This disclosure describes a battery management system that can balance a string of battery cells rapidly, at high power, and without the use of a large auxiliary battery or excessive switches / transistors. A single switched tap is provided at each intermediate node of the battery string, allowing charging and discharging of subsets of the battery string (e.g., cell 1, cells 1 and 2, cells 1-3, etc.). A common charge / discharge (CCD) node can be connected to any one of the intermediate nodes, resulting in a parallel connection with the battery string for each cell at or below the connected intermediate node in the string. A sink is provided which can be used to discharge groups of cells using the connected intermediate node. Additionally, a source can be provided, such as a buck-boost chopper acting as a current supply, to charge the group of cells using the connected intermediate node.

The invention discloses an interleaved boost chopper circuit and a high-frequency switching power supply, the circuit is used for performing boost processing on an input voltage to output a DC output voltage, and the circuit comprises a driving module and at least one boost module connected with the driving module; when a plurality of boosting modules are arranged, all the boosting modules are connected in parallel, and the driving module is used for alternately driving the plurality of boosting modules; the boosting module comprises a low-frequency current loop and a high-frequency current loop which are mutually coupled; the low-frequency current loop is used for boosting the input voltage and outputting the low-frequency current in the interleaved boost chopper circuit from the positive end and the negative end of the input voltage; the high-frequency current loop is an internal closed loop and is used for enabling high-frequency switch alternating current generated when the driving module drives the boosting module to flow in a closed mode. And the high-frequency conducted interference in an input loop and the radiated interference to the surrounding space are greatly and obviously reduced.

A high-voltage charging circuit on the vehicle side, which is equipped with an AC voltage connector (WA); at least two electrically isolated DC voltage converters (W1, W2) configured as boost choppers and a rectifier (G), through which the DC voltage converters (W1, W2) are connected to the AC voltage connector (WA); and a changeover switch (US). The charging circuit has first and second DC voltage connectors (A1, A2), which can be selectively connected to the first DC voltage converter (W1) via the changeover switch (US). The charging circuit has a third DC voltage connector (A3), which is permanently connected to the second DC voltage converter, wherein the charging circuit furthermore has a control device (S), which is set up to control the DC voltage converter in a first mode according to a first rated output voltage, the first rated output voltage being at least 750 V and at most 1000 V; and in a second mode according to a second rated output voltage, the second rated output voltage being at most 480 V or at most 450 V. Furthermore, an on-vehicle electrical network having a high-voltage charging circuit on the vehicle side is described.

The invention discloses a self-adaptive control strategy and an oscillation suppression algorithm suitable for a network construction type control system, and belongs to the technical field of power electronic device control, the self-adaptive control strategy comprises a direct current side circuit control strategy and an alternating current side self-adaptive control strategy, and a direct current side circuit is a boost chopper circuit; the AC side adaptive control strategy is based on traditional VSG control, and after disturbance is detected by the oscillation suppression algorithm, a reactive power control loop of the VSG is adaptively switched to a DC current loop. The oscillation suppression algorithm mainly comprises the steps that the absolute value of frequency deviation in the alternating current system is compared with a preset allowable deviation value, and when the absolute value of the frequency deviation is large, it is judged that disturbance occurs in the alternating current system. According to the oscillation suppression algorithm, whether disturbance exists in the system can be detected, the self-adaptive control strategy is matched, the modulation coefficient (MI) is automatically controlled to be increased after the disturbance is generated by the system, the direction of the capacitance current is opposite to the direction of the current generated at the moment before the self-adaptive algorithm is adopted, and the oscillation of the system is suppressed in a mode of suppressing the resonance current.

A step-up device is provided with a control unit (3) that performs feedback control on the basis of a correction inductor current value and a voltage value between input terminals and output terminals of a step-up chopper circuit (2). The switching element is driven so as to approach a predetermined control target value and so as to coincide with a phase amount obtained by dividing the phase difference of the respective drive phases of the booster circuits driven at the same switching cycle by 360 DEG by the number of booster circuits. The corrected inductor current value is obtained by applying a current correction value to a sample current value obtained by sampling a measured inductor current value at a constant sampling interval. The current correction value corrects a difference between an average value of a sample current value, which is a difference generated according to the number of booster circuits (13A, 13B), and an average value of an actual inductor current value, which is a true value of a current flowing through the inductor.

The present invention discloses a control method for a photovoltaic virtual synchronous generator system. The control method includes: inverter control, energy storage side bidirectional chopper control, and photovoltaic side boost chopper control. On the basis of virtual synchronous generator control, the inverter control adds photovoltaic power feedforward control to directly transfer the power disturbance on the photovoltaic side to the grid side. In the energy storage side bidirectional chopper control, the DC bus voltage adopts proportional integral resonant control, so that in a single-phase system or a three-phase unbalanced load, the energy storage system absorbs the double-frequency power of the DC bus. The photovoltaic side boost chopper control adopts the maximum power tracking point control method. The present invention realizes the optimization of the energy storage capacity and the DC bus capacitor capacity without affecting the VSG frequency support function.

The utility model relates to a high-efficiency boost chopper circuit, and belongs to the field of DC boost circuits. The high-efficiency boost chopper circuit comprises an energy conversion branch circuit, an energy storage branch circuit, a first switch branch circuit, a second switch branch circuit and a pulse width modulation chip, and the first switch branch circuit and the second switch branch circuit are controlled and connected through the pulse width modulation chip, so that the first switch branch circuit and the second switch branch circuit can be alternately connected and conducted. Therefore, the reaction time of waiting for the conduction of the diode after the first switch tube in the existing boost chopper circuit is turned off is avoided, the charging preparation time of the output filter capacitor is shortened, and the forward conduction voltage drop of the metal oxide semiconductor field effect transistor replacing the diode is obviously reduced compared with the conduction voltage drop of the diode. Therefore, the power loss in the boost conversion process of the boost chopper circuit can be remarkably reduced, and finally the boost conversion efficiency, namely the working efficiency, of the boost chopper circuit is remarkably improved.

The invention relates to an automobile solenoid valve actuator driving method and system, gate driver control adopts a peak protection driving mode, a boost chopper circuit applies a peak driving voltage to a solenoid valve coil, so that the coil current rises to a peak current at a first speed, and the rising time lasts to a first time point; controlling the coil current to actively attenuate to low ebb current at a second time point through a gate driver, switching to a saturation driving mode at the second time point, and applying battery voltage to the solenoid valve coil until the needle valve-moving armature ascends to the maximum displacement position; and in the holding mode, the position of the needle valve-moving armature is maintained through holding current, so that the nozzle is kept in a continuous opening state. Compared with the prior art, the system has the advantages of being long in service life, accurate in fuel injection quantity, fast in response and the like.