frequency jitter
The EG1615 chip is a control chip specifically designed for DC to DC inverter boost and battery charging management in bidirectional inverters (the same circuit can function as an inverter or a battery charger). It integrates two 600V half bridge high-voltage MOS drivers, with an output current capability of+/-2A. It also has four independent PWM turn off protections built in, which can effectively prevent MOS damage caused by excessive peak current in extreme situations. In addition, it provides two SDs, namely SD1 and SD2. SD1 is the turn off pin for driver 1 HO1 and LO1, and SD2 is the turn off pin for driver 2 HO2 and LO2. Combined with external comparator and SD functions, it can achieve... Functions such as current or short circuit protection. The main function of EG1615 consists of two parts. The first part is inverter boost control, which mainly converts the low voltage DC voltage of the battery into high voltage DC voltage for the high voltage required by the subsequent DC/AC inverter; The second part is the voltage reduction control of the charger, which mainly converts the high-voltage DC voltage of the mains power boosted by PFC into low-voltage DC voltage for constant voltage and current charging required for battery charging. EG1615 adopts LC resonant dual active bridge (DAB) topology structure, which can achieve bidirectional energy control. Combined with the matching of PWM operating frequency and LC resonant parameters, it can achieve soft switching control of switching tubes, making it easy to apply in high switching frequency, high efficiency and other occasions. When EG1615 is used for inverter boosting, the duty cycle of the low-voltage side H-bridge is 50%, and the high-voltage side H-bridge uses MOS internal body diodes for rectification output. The voltage feedback adopts a shallow closed-loop stabilization mode (i.e. maximum voltage limit under no-load, open-loop with load), effectively preventing phenomena such as device burnout caused by high voltage under no-load. The resonance parameters are adjusted by an external LC, and the chip can support PWM operating frequencies of 40K-150KHz. The current transformer connected in series on the high-voltage side can be used for output short-circuit protection. When EG1615 is used for charging voltage reduction, the duty cycle of the high-voltage side H-bridge is 50%. The low-voltage side H-bridge uses MOS internal diodes for rectification output and MOS tubes for automatic tracking synchronous rectification function. The constant voltage (CV) and constant current (CC) of charging need to be coordinated with the PFC voltage regulation function in EG8026. The current transformer connected in series on the high-voltage side can be used for output short-circuit protection.
