Charge controller and charging system

A charging system configured to charge a battery provided inside a vehicle with power supplied from an external power source apparatus via a power cable,

• wherein the external power source apparatus includes
• a signal output section which outputs an oscillation signal or a non-oscillation signal serving as a control signal for activating a charge controller provided inside the vehicle and
• a switching control section which switches the control signal from the non-oscillation signal to the oscillation signal when a preparation for power supply is completed,
• wherein the charge controller includes
• a control section which controls a charging of the battery and
• an activating section which activates the control section, wherein the control section changes a voltage of the control signal, and
• wherein the activating section includes:
• an oscillation state judgment section which judges whether the control signal input from the external power source apparatus via the power cable is in an oscillation state or a non-oscillation state and outputs an oscillation state judgment signal and
• an activating signal generation section which generates an activating signal for activating the control section when the oscillation state judgment signal is switched from a state indicating non-oscillation to a state indicating oscillation.