2results about How to "Reduce low frequency noise" patented technology

This invention relates to the field of vehicles, providing a housing structure, a rear bumper assembly, a vehicle body, and a vehicle. The housing structure includes a housing body with a receiving groove for accommodating a pressure relief valve on a rear side panel. The housing body can be positioned on the outside of the rear side panel of the vehicle, and an exhaust passage communicating with the pressure relief valve is formed between the receiving groove and the rear side panel. The exhaust passage has an exhaust port facing the rear end of the vehicle. When the vehicle is in motion, the airflow outside the vehicle bypasses the housing body and flows towards the rear end of the vehicle. Since the exhaust port of the exhaust passage faces the rear end of the vehicle, the airflow outside the exhaust passage passing through the exhaust port causes minimal pressure changes within the exhaust passage, resulting in minimal pressure differential fluctuations between the exhaust passage and the inner side of the rear side panel. This effectively reduces the frequency and amplitude of the pressure relief valve's flapping action, thereby reducing low-frequency noise generated by pressure differential fluctuations in the acoustic cavity and ensuring passenger comfort.

This invention relates to a high-voltage, capacitor-free, low-noise linear regulator. It comprises a high-voltage switching voltage follower, a self-zeroing error amplifier, and voltage divider resistors. The high-voltage switching voltage follower significantly enhances the system's transient response to load changes and improves power supply rejection in the mid-frequency range. The self-zeroing error amplifier, together with the high-voltage switching voltage follower, forms a global slow loop. The self-zeroing error amplifier employs a ping-pong self-zeroing method, effectively reducing low-frequency flicker noise and offset while ensuring continuous operation in the time domain. This invention introduces a settling phase between the self-zeroing and amplification phases of the ping-pong module, significantly reducing output glitches caused by amplifier settling time. This invention operates stably without an external output capacitor, supports a wide input and output voltage range, and possesses excellent characteristics such as low noise, high power supply rejection, and fast response, making it suitable for various demanding high-voltage power supply applications.