Patent ID: 7202633

Claim:
A driving circuit, comprising: a secondary battery cell having a positive electrode and a negative electrode; first and second N-type field effect transistors each having a gate, a drain, and a source; first and second switching devices, connected between the gates of the first and second N-type field effect transistors and the negative electrode side of the secondary battery cell, for turning on and off the first and second N-type field effect transistors; driving means for controlling the first and second switching devices; first and second output terminals; and a diode having an anode and a cathode; wherein the drain of the first N-type field effect transistor is connected to the positive electrode side of the secondary battery; wherein the source of the first N-type field effect transistor and the source of the second N-type field effect transistor are connected; wherein the drain of the second N-type field effect transistor is connected to the first output terminal; wherein the negative electrode side of the second battery cell is connected to the second output terminal; wherein a voltage source for supplying a gate voltage higher than a source voltage of the first and second N-type field effect transistors is connected between a connection point of the sources of the first and second N-type field effect transistors and the gates of the first and second N-type field effect transistors; wherein the cathode of the diode is connected to the negative electrode side of the voltage source; and wherein the anode of the diode is connected to the negative electrode side of the secondary battery cell.