Multi-voltage control circuit of tree branch network

A multi-voltage battery circuit, comprising at least four batteries of substantially equal voltage and including first, second, third and fourth batteries, respectively, each of the batteries having a substantially equal terminal voltage and each of the batteries having respective positive and negative terminals, a plurality of switches including a first switch between the first and second batteries, a second switch between the second and third batteries, and a third switch between the third and fourth batteries, respectively, each of the switches having first and second common contacts, first and second normally closed contacts, and a normally open contact, respectively, such that when each switch is actuated, the respective normally closed contacts are opened, and such that the respective first common contact is connected to the respective normally open contact, a plurality of diodes including first, second, third, fourth, fifth and sixth diodes, respectively, each of the diodes having respective positive and negative terminals, a pair of output terminals including a positive output terminal and a negative output terminal, respectively, means for connecting the positive terminal of the first battery to the first common contact of the first switch and to the negative terminal of the first diode, respectively, means for connecting the negative terminal of the first battery to the negative terminal of the second diode, to the second common contact of the first switch, to the second common contact of the second switch, to the negative terminal of the fourth diode, and to the common output terminal, respectively, means for connecting the positive terminal of the second battery to the positive terminal of the first diode, to the negative terminal of the third diode, and to the first common terminal of the second switch, respectively, means for connecting the negative terminal of the second battery to the normally open contact of the first switch, to the positive terminal of the second diode, and to the second normally, closed contact of the first switch, respectively, means for connecting the positive terminal of the third battery to the negative terminal of the fifth diode and to the common contact of the third switch, respectively, means for connecting the negative terminal of the third battery to the normally open contact of the second switch, to the negative terminal of the sixth diode, to the second normally closed contact of the second switch, to the second common contact of the third switch, and to the positive terminal of the fourth diode, respectively, means for connecting the positive terminal of the fourth battery to the first normally closed contact of the third switch, to the positive terminal of the fifth diode, to the first normally closed contact of the second switch, to the first normally closed contact of the first switch, to the positive output terminal of the third diode, and to the positive output terminal, respectively, means for connecting the negative terminal of the fourth battery to the normally open contact of the third switch, to the positive output terminal of the sixth diode, and to the second normally closed contact of the third switch, respectively;

• wherein in the normal position of the respective first, second and third switches, the respective first, second, third and fourth batteries are in parallel, and the voltage at the output terminals is the terminal voltage of each battery;
• wherein, when the first and third switches are actuated, the first and second batteries are connected in series, the third and fourth batteries are connected in series, the series-connected first and second batteries are in parallel with the series-connected third and fourth batteries, and the voltage at the output terminals is twice the terminal voltage of each battery;
• and wherein, when the first, second and third switches are actuated, the first, second, third and fourth batteries are all in series, and the voltage at the output terminals is four times the terminal voltage of each battery.