Design and Implementation of AC-DC-DC Back-end Circuit with Low Ripple and Good Electromagnetic Compatibility

To satisfy the multi-channel and multi-output demand of AC-DC-DC power supply for airborne equipment, and improve the current AC-DC back-end DC-DC power supply single function, the number of large, complex EMC hardware and software design was created using double closed-loop control, PWM modulation, chaotic filtering and improved LLC topology. The result showed that a single 28V input was stably converted into a high-quality power supply voltage of +28, ±15, ±12, and ±5 V. A single-input and 10-output DC-DC power supply was implemented successfully. With function and performance tests and verification, the power supply was found to meet the needs of high mobility, frequent use, and severe vibration and shock in complex electromagnetic environments.