Patent ID: 9065281
Filing Date: 2015-06-23
Classification: H02J

Abstract:
1. A charge and discharge control circuit for controlling charge and discharge of a secondary battery by a single bidirectionally conductive field effect transistor, the charge and discharge control circuit comprising: a control circuit connected to both ends of the secondary battery, and configured to determine whether the secondary battery is in a charge-inhibited or a discharge-inhibited state; a switch circuit including a first terminal connected to a back gate of the bidirectionally conductive field effect transistor and a second terminal, for controlling a gate of the bidirectionally conductive field effect transistor based on an output of the control circuit, wherein the switch circuit comprises: a first transistor including a drain connected to a drain of the bidirectionally conductive field effect transistor, and a source and a back gate which are connected to the first terminal of the switch circuit; and a second transistor including a drain connected to a source of the bidirectionally conductive field effect transistor, and a source and a back gate which are connected to the first terminal of the switch circuit.