| 摘要 |
<p>A power supply with a battery disconnect has battery power terminals (105, 109), and a charging terminal (121). The battery power terminals are for receiving battery power from a to be provided battery (111, 119). External power terminals (103, 107) are also provided for receiving external power from a to be provided external power source (115). A charging circuit (137) provides a charge path between the external power terminal (103) to the charging terminal (121). A gate (113), has an input (123) coupled to the external power terminal (103), an output (125) coupled to the battery power terminal (109), and a control input (127) coupled to the external power terminal (107). The output (125) of the gate (113) is decoupled from the input (123), responsive to the connection of the external power source (115). The battery power terminal (105), the external power terminals (103, 107) and the input (123) of the gate (113) are combined and provide operative power to a load (101) from either the external power source (115) through the external power terminals (103, 107), or the battery (111, 119) through the battery power terminal (105) and the input (123) of the gate (113). Simultaneously, the gate (113) and the charging terminal (137) permit the charging of a secondary battery (119) coupled to the charging terminal (121) and the battery power terminals (105, 109), responsive to the connection of the external power source (115), and the gate (113) prevents the charging of a primary battery (111) connected to the battery power terminals (105, 109), responsive to the connection of the external power source (115).</p> |
