Multi-output SEPIC converter

A SEPIC (single ended primary inductor converter) DC/DC converter that provides positive and negative output voltages, comprising:

• an input side reactor;
• a first coupling capacitor;
• a positive rectifier diode;
• a positive output side reactor;
• a first smoothing capacitor;
• a second coupling capacitor;
• a negative rectifier diode;
• a negative output side reactor;
• and
• a second smoothing capacitor, wherein:
• the SEPIC DC/DC converter has a single input;
• a positive output of the SEPIC DC/DC converter is electrically connected via the input side reactor, the first coupling capacitor, and the positive rectifier diode;
• the first smoothing capacitor is electrically connected between the positive output and a ground potential;
• the positive output side reactor is electrically connected between a connecting point of the first coupling capacitor and the positive rectifier diode and the ground potential;
• a negative output of the SEPIC DC/DC converter is electrically connected to the connecting point of the first coupling capacitor, the positive rectifier diode, and the positive output side reactor via the second coupling capacitor and the negative output side reactor;
• the second smoothing capacitor is electrically connected between the negative output and the ground potential;
• the negative rectifier diode is connected between a connecting point of the second coupling capacitor and the negative output side reactor and the ground potential;
• the first coupling capacitor has a first capacitance and the second coupling capacitor has a second capacitance;
• and
• a ratio of the first capacitance and the second capacitance is set to improve cross regulation between the positive output and the negative output.