<p>Capacitor unit and capacitor control system used in high output power source are reduced in size. A capacitor unit (1) controlled by the capacitor control system is divided into capacitor blocks (3) formed of a specified number of capacitors (2) connected in series, and each capacitor block (3) is provided with a detector (4). Plural detectors (4) are connected to a microcomputer (6) by way of an analog switch (5).</p>
