Patent ID: 9748853
Date: 2017-08-29
CPC Classifications: H02J,H02M,H05B

Claim:
1. A method executed by a microcontroller to control a semi-dual-active-bridge (SDAB) converter, the method comprising: providing the microcontroller with a Pulse Width Modulation (PWM) circuit; providing the SDAB converter in communication with the microcontroller and including a transformer with a primary winding and a secondary winding with a primary-to-secondary turns ratio of 1:n, a first side bridge circuit that connects to the primary winding of the transformer and includes four active switches, and a second side bridge circuit that connects to the secondary winding of the transformer and includes two active switches and two diodes; calculating, by the microcontroller and based on an input voltage V determining, by the microcontroller and based on a phase shift angle Φ between the first side bridge circuit and the second side bridge circuit, a current operation mode for the SDAB converter; calculating, by the microcontroller, an adjustment φ to be added to the phase shift angle Φ response to a power adjustment command; determining, by the microcontroller and based on the adjustment, a target operation mode for the SDAB converter; determining, by the microcontroller and based on the current operation mode and the target operation mode, an optimal ratio x; calculating, by the microcontroller, changes of each gating signal that are applied to the first side bridge circuit and the second side bridge circuit respectively to generate calculated gating signals, wherein xφ is a phase shift angle to be adjusted during transition on the first side bridge circuit, and (1−x)φ is a phase shift angle to be adjusted during transition on the second side bridge circuit; sending, by the microcontroller, the calculated gating signals to the PWM circuit to generate modulated gating signals; and transmitting, by the microcontroller, the modulated gating signals to the first side bridge circuit and the second side bridge circuit respectively.