Energy-saving automatic balancing device with double range extenders

The utility model discloses an energy-saving automatic balancing device for double range extenders, and particularly relates to the field of energy-saving control, which is characterized in that when an auxiliary range extender starts to work and the load power is kept unchanged, the current of a main output positive electrode line of a power supply of a main range extender can be reduced to 60A, and the actual total power is still 120A; at the moment, a relay module in the high-current detection sensor does not work, the positive electrode of the high-current sensor cannot be transmitted to the positive electrode of the low-current detection sensor, but the self-protection circuit provides the positive electrode for the low-current detection sensor and stably supplies power, the current is equal to 60A and reaches a threshold value 50A, so that the auxiliary range extender is still in a starting state, and the auxiliary range extender is in a starting state. When the total current is reduced to 90A, the tota