12 results about "Ćuk converter" patented technology

The invention provides a temperature-fused lithium ion battery active equalization control method and a temperature-fused lithium ion battery active equalization control system. The method comprises the following steps: when the lithium ion battery is in an equalization mode, acquiring an initial temperature and an initial charge state of each cell of the lithium ion battery; constructing a linear state prediction model; constructing a cost function, converting the cost function into a quadratic programming problem with linear constraints, and solving the quadratic programming problem to obtain an optimal battery equalization current; adjusting a bidirectional switch tube of the bidirectional Cuk converter according to the optimal battery equalization current to control energy flow, and adjusting the battery equalization current; and updating the charge state of each battery cell and the temperature of each battery cell through the LSTM model and a preset constraint. Therefore, by constructing an active equalization control method taking the state of charge of the battery cell and the temperature deviation as targets and combining the fine current regulation capability of the bidirectional Cuk converter, the dynamic prediction and intelligent optimization control of the state of the lithium ion battery are realized, the equalization speed of the lithium ion battery is improved, the temperature difference during equalization is reduced, and the safety is improved.

This invention discloses a parallel equalization system based on a bidirectional CUK converter, comprising an equalization system module and a selection switch matrix module. The selection switch matrix module includes n sets of selection switch matrices, each set containing four selection switches. The positive terminal of the first battery is connected to the drain of the first selection switch, the source of the first selection switch is connected to the drain of the third selection switch, the source of the third selection switch is connected to the negative terminal of the first battery, the drain of the second selection switch is connected to the drain of the first selection switch, the source of the second selection switch is connected to the drain of the fourth selection switch, and the source of the fourth selection switch is connected to the source of the third selection switch. The equalization system module has multiple equalizers, each connected to a corresponding selection switch matrix. Each equalizer includes two inductors, one auxiliary power switch, one control power switch, and two capacitors. This system enables equalization of multiple series-parallel battery packs during charging and discharging, offering flexible equalization methods.

A DC-DC power supply of a four-switch three-level Cuk converter comprises the four-switch three-level Cuk converter, a driving circuit, an FPGA control circuit and a detection circuit, the FPGA control circuit generates four paths of PWM signals, the four paths of PWM signals are amplified by the driving circuit, a switching tube of the four-switch three-level Cuk converter is controlled, a direct current input voltage is converted into a relatively stable direct current output voltage, electric energy conversion is achieved, and the four paths of PWM signals are output through the detection circuit. And the detection circuit collects the output voltage, feeds the output voltage back to the FPGA control circuit, and performs iteration for many times until the output voltage tends to be stable, so that the voltage is stabilized and adjusted.

A high-voltage pulse voltage showing various waveform shapes is generated stably and with a simple configuration. 【Solution means】A stage voltage generation unit 4a to 4e that receives a P / N voltage common to each stage generated from externally supplied power and provided in each of stages 3a to 3e, and generates a stage voltage by an isolated bidirectional Cuk converter, and pulse generation units 5d and 5e that switch the stage voltage to generate individual pulse voltages, and a series connection unit 14 that serially connects the outputs of the individual pulse voltages. When charge is discharged from the load capacitance to the apparatus 1 due to plasma fluctuations or the like and the charging voltage of the capacitor 49e in any stage increases, the isolated bidirectional Cuk converter performs a reverse conversion operation without an interval. As a result, the energy due to the excessive charging voltage of the capacitor 49e is regenerated and recycled to the capacitor 28 common to stages 3a to 3e.

The present invention discloses a soft-switching four-tube Cuk converter, comprising a power supply V in , inductor L1, inductor L2, switch tube Q1 and its anti-parallel diode and junction capacitance, switch tube Q2 and its anti-parallel diode and junction capacitance, switch tube Q3 and its anti-parallel diode and junction capacitance, switch tube Q4 and its anti-parallel diode and junction capacitance, output capacitor C f and the intermediate capacitor C b The soft-switching four-tube Cuk converter includes 8 switching modes. By controlling the on and off of the switch tubes Q1, Q2, Q3, and Q4, the current i L1 Or the current i of inductor L2 L2 The control is a quadrilateral, sequentially charging and discharging the two junction capacitors in one of the switch arms. The four switches are sequentially turned on at zero voltage, and the inductor current ripple decreases as the load decreases. This invention can achieve ZVS for all switches across the entire range, significantly reducing switching losses.

An improved dual Cuk DC-DC converter comprising 3 inductors, 3 capacitors, and 4 semiconductor elements, which meets the same performance requirements as a standard Cuk converter, thereby enabling a reduction in its size and cost.

The utility model relates to a direct current power supply DC / DC module of an inertial sensor, which comprises an isolation type bidirectional Cuk converter, a PI controller, a PI self-adaptive fuzzy controller and a PI self-adaptive fuzzy control strategy, and adopts a brand new topological structure. The inertial sensor direct current power supply DC / DC module can quickly output direct current voltage and direct current in a voltage reduction mode by presetting proper proportion and integral control parameters; a PI parameter, a threshold value U and a scaling factor beta parameter are preset, so that an inertial sensor direct current power supply DC / DC module outputs required direct current voltage in a boost mode; meanwhile, the requirements of charging and energy storage on the low-voltage power module side from the high-voltage direct-current bus side and the requirements of discharging and energy releasing on the power module side are met, and bidirectional power conversion between two different levels of direct-current voltages is achieved; and stable operation of the inertial sensor system is ensured.

The present invention discloses a wide output low voltage stress bridgeless PFC converter based on SEPIC and Cuk, which relates to the technical field of PFC converters. The topology of the PFC converter includes a SEPIC circuit unit, a Cuk circuit unit, an output capacitor C p and output capacitor C n ; SEPIC circuit unit includes switch tube S S , input inductor L S1 、Inductor L S2 , intermediate capacitor C S , input diode D S1 , diode D S2 ; Cuk circuit unit includes switch tube S C , input inductor L C1 、Inductor L C2 , intermediate capacitor C C , input diode D C1 , diode D C2 The SEPIC circuit unit and the Cuk circuit unit are connected in parallel at the input and in series at the output, reducing the voltage stress on the switch tube. By connecting the two circuit units in parallel at the input and in series at the output, the present invention utilizes a SEPIC and Cuk PFC converter cascade topology, reducing diode components and thus converter operating losses, while retaining the other key components of the SEPIC and Cuk converters, namely, the LC filter network characteristics of the input and output of the two converters.

The invention relates to a method for reducing EMI noise of a converter, in particular to a method for reducing EMI noise of a Cuk converter combining chaotic spread spectrum and soft switching. According to the method, the EMI noise of the Cuk converter is reduced through cooperation of the chaotic spread spectrum technology and the soft switching technology, the chaotic spread spectrum technology and the soft switching technology are combined for the EMI problem generated in the high-speed switching process of the Cuk converter, and the broadband EMI noise is comprehensively suppressed. According to the method for carrying out EMI noise suppression on the Cuk converter by combining improved chaotic spread spectrum and soft switching technologies, a non-inductive Chua's chaotic circuit is designed and built, the non-inductive Chua's chaotic circuit serves as a frequency modulation signal to generate a chaotic PWM signal, switching-on and switching-off of a driving signal of a switching tube of the Cuk converter are controlled, and zero-voltage switching-on is achieved. According to the method, the conduction noise of the Cuk converter is suppressed, the suppression effect is good, the implementation method is simple, and industrial application is facilitated.

A half-bridge converter includes a high-side transistor connected to a positive electrode of a direct current (DC) voltage source and a low-side transistor connected to a reference ground. A gate driver is configured to control the high-side and low-side transistors at a duty cycle of a gate driver control signal. A bootstrap circuit is configured to provide a positive voltage and a negative voltage to the gate driver for the high-side transistor. The bootstrap circuit comprises a first diode, a first capacitor and a Cuk converter. The Cuk converter comprises a first and a second inductor, a switch, a first and a second capacitor and a second diode to output the negative voltage to the high-side transistor gate driver. The Cuk converter is configured to output the negative voltage when operating in a Discontinuous Voltage Mode (DVM).

The invention discloses a Cuk-based lithium battery pack SOC equalization circuit. The circuit comprises a basic Cuk converter, (n-1) bridging capacitors, (n-1) output expansion units and n lithium ion batteries, the basic Cuk converter comprises two inductors L1 and Lin, capacitors C1 and Cin, a switch S1 and a diode D1; the (n-1) th output expansion unit comprises an inductor Ln, a capacitor Cn and a diode Dn; wherein one end of the inductor Ln is connected with the anode of the diode Dn, the other end of the inductor Ln is connected with one end of the capacitor Cn, and the other end of the capacitor Cn is connected with the cathode of the diode Dn. According to the invention, a multi-output Cuk converter equalization topological structure is adopted, and the terminal voltage equalization of the battery units in the battery pack is realized by adding a bridging capacitor between the output units. According to the equalization circuit, automatic voltage equalization between the battery units is achieved through the bridging capacitors, and complex sampling and control algorithms are not needed; and moreover, the problem of terminal voltage imbalance caused by inconsistent parasitic parameters of devices during multi-output of the converter is avoided, the voltage deviation is effectively reduced, and the battery equalization precision is improved.

The application provides a control method and a control system for active balancing of lithium ion batteries at a fusion temperature. The method comprises: obtaining the initial temperature and the initial state of charge of each cell of the lithium ion battery when the lithium ion battery is in the balancing mode; constructing a linear state prediction model; constructing a cost function and converting it into a quadratic programming problem with linear constraints and solving to obtain the optimal battery balancing current; adjusting the energy flow of the bidirectional Cuk converter bidirectional switch tube according to the optimal battery balancing current to adjust the battery balancing current; updating the state of charge of each cell and the temperature of each cell through the LSTM model and the preset constraints. In this way, by constructing an active balancing control method targeting the state of charge and temperature deviation of the cells, combining the fine current regulation capability of the bidirectional Cuk converter, the dynamic prediction and intelligent optimization control of the lithium ion battery state are realized, the balancing speed of the lithium ion battery is improved, the temperature difference during balancing is reduced, and the safety is improved.