A Low-Voltage-Deviation and Small-Output-Voltage-Ripple DC-DC Converter with Reduced Output Capacitance in Automotive Applications

With the increasing demand for EVs, capacitors are a shortage to improve EV performance. In this paper, a reducing output capacitance control technique achieves to reduce the value of output capacitance with small output voltage ripple and low voltage deviation. Point of Load (POL) for secondary power supply in EV applications needs a simple design and implementation. The proposed Compensating Light-load Operation and a Simple voltage-mode (CLOS) control for POLs are designed simply by using the AND logic circuit as the gate signal mixture. A prototype experimental result with 12 V input, 5 V output is obtained to verify the circuit operation. The proposed control circuit with reduced output capacitance improves voltage deviation and output voltage ripple, while the experimental prototype circuit uses six times smaller output capacitance.