ADDC series adjustable stable DC power supply is a voltage and current continuously adjustable, automatic conversion of steady voltage and current high-precision DC stable power supply, the output voltage is adjustable from zero volt, arbitrarily selected within the nominal range, limiting protection point can be arbitrarily chosen, the output power can be continuously adjustable within the nominal range. It has functions of current limiting protection, short circuit protection, over temperature protection (current greater than 30A there). Dual power can implement the main, subordinate circuit; and can be connected in series (used for voltage enlarge) or in parallel (used for current enlarge).