Conversion system for multi direct current voltage

A conversion system comprising:

• a transformer;
• a rectifier element;
• a filter circuit;
• a voltage regulator circuit comprising a first option switch, a first regulator, and a second regulator;
• and
• a divider circuit,
• wherein the transformer outputs of an AC voltage to the rectifier element, the rectifier element converts the AC voltage to a pulsating DC voltage and outputs the pulsating DC voltage to the filter circuit, and the filter circuit converts the pulsating DC voltage to a DC voltage and outputs the DC voltage to the first option switch;
• the divider circuit outputs a first DC voltage of a constant positive value when the first option switch is connected to the first regulator, the divider circuit is electrically connected to the first regulator to control value of the first DC voltage;
• the divider circuit outputs a second DC voltage of a constant negative value when the first option switch is connected to the second regulator, the divider circuit is connected to the second regulator to control value of the second DC voltage;
• wherein the voltage regulator circuit further comprises a second resistance and a third capacity, a first end of the second resistance is electrically connected to an output end of the first regulator and an output end of the second regulator, and a second end of the second resistance is electrically connected to a common end of the first regulator, a common end of the second regulator, and an anode of the third capacity;
• and a cathode of the third capacity is grounded.