METHOD FOR CONTROLLING BIDIRECTIONAL ISOLATED POWER CONVERTER WHILE MAINTAINING MAGNETIC BALANCE Russian patent published in 2024 - IPC H02M1/40 

FIELD: electric power sources.

SUBSTANCE: invention can be used in uninterruptible power supplies, as well as in circuits for charging and discharging batteries. A method for controlling a bidirectional isolated converter, comprising a leading bridge converter formed by the first and second arms, a slave bridge converter formed by the first and second arms, a transformer with a primary winding connected to the leading bridge converter and a secondary winding connected to the slave converter, a choke, and a current sensor, modulators that control the leading and driven bridges, as well as a control system, which consists of measuring the currents of the secondary winding of the transformer, averaging the measured currents over a period, subtracting the average current values, and, based on this difference, controlling the durations of the on and off states of the slave converter keys. Additionally, pulse-phase modulators are used as modulators and the current of the primary winding of the transformer is measured, a subtraction operation is performed for the currents of the primary and secondary windings. Based on this difference, a compensation signal is generated using the PID controller, which changes the response thresholds of the phase-pulse modulator that controls the keys of the slave bridge converter. If this difference is greater than zero, using this signal the duration of the on state of the upper of the keys of the first arm of the slave converter is reduced, and the duration of the on state of the other key of this arm of the slave converter is increased by the same amount. If this difference is less than zero, the duration of the on state of the upper of the keys of the first arm of the slave converter is increased, and the duration of the on state of the other switch of this arm is reduced by the same amount.

EFFECT: objective of the invention is to prevent saturation of the transformer of a bidirectional isolated converter, as well as to reduce the weight and size parameters of the circuit by eliminating the blocking capacitor, introducing a dead pause between switching transistors of the leading and driven bridges, as well as organizing a magnetization compensation system in such a way as to prevent loss of transmitted power.

1 cl, 6 dwg