6 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.

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.

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 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.