| 摘要 |
An electrical supply unit includes a supply unit controller 76 that controls the supply of electricity through a supply line for a battery charger and a control pilot line 24 that carries a PWM control pilot signal between the supply unit and the battery charger controller. Control unit 76 drives a control pilot signal generator to generate the PWM pilot signal and includes a switched bridge circuit 73. The bridge can comprises switches SW1,SW2 to connect pilot 24 and earth 42 lines alternately to a zero volt reference line 84, and resistors R1,R1 connecting the lines to supply 82 giving a ±12V voltage relative to earth on the control pilot line. The supply unit can include a resistor divider network 75 having measuring node 78 whose voltage is proportional to the voltage on the pilot line and is connected to a measuring device such as analogue to digital converter (ADC) 80 in controller 76. Electrical supply unit may be an EVSE for an electric vehicle including a mains electricity switch, controlled by controller 76, to control the supply of power through the supply line. |
