1results about How to "Input voltage is stable" patented technology

This utility model discloses a power supply circuit, belonging to the field of electric vehicle instrument technology, specifically relating to a power supply circuit for an electric vehicle instrument, including: a switching regulator U1, an input filter component, an output filter component, a voltage divider network component, and a Zener diode D1; this utility model adds a constant voltage circuit to the power supply circuit, which stably converts a wide input voltage range into DC output, while the input filter component filters out noise from the input power line and reduces the backflow of high-frequency current ripple generated during the operation of the switching regulator. The output filter component smooths the high-frequency pulsating current generated by the switching action into a relatively stable DC voltage and further filters out high-frequency noise. In addition, the voltage divider network component samples the voltage and feeds it back to the switching regulator U1 to adjust the output voltage to ensure that it is maintained at a set constant value, thereby achieving stable output voltage.