Figure 3-4 shows the system block diagram of the
TIDM-02013 reference design, which includes the
following elements.
- Power switches G1-G4 are high-frequency GaN MOSFETs, for which there is a 180° phase shift between each half bridge leg. G5 and G6 forms a low-frequency (40- to 60-Hz) synchronous rectifier bridge which virtually has no switching loss; a low conduction loss feature is desirable for these two devices.
- TMS320F280039C C2000 real-time microcontroller functions as the controller, which has all the voltage and current sensor inputs and generates the correct PWM signals for G1-G6. The controller also reads any fault signal from the gate driver boards and shuts down the system if a fault occurs. The reset function is used during start-up or when a fault clears.
- Hall sensors are used to sense the total input current and current for each channel. Voltage dividers are used to sense the input line and neutral voltages as well as output DC bus voltages.