Charge controller and charging system

1. A charge controller configured to control a charging of a battery provided inside a vehicle using a control signal supplied from an external power source via a power cable,

wherein the external power source apparatus switches the control signal from a non-oscillation state to an oscillation state when a preparation for power supply from the external power source apparatus is completed,

wherein the charge controller includes, inside the vehicle,

a control section which controls the 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 the oscillation state or the 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.

2. The charge controller of claim 1 ,

wherein the oscillation state judgment section switches the oscillation state judgment signal from the state indicating non-oscillation to the state indicating oscillation when the number of pulses of the control signal becomes equal to or more than a predetermined value.

3. The charge controller of claim 2 ,

wherein the oscillation state judgment section includes

a pulse integration section which accumulates the number of pulses of the control signal during a predetermined period and

a comparison section which compares the accumulated number at the pulse integration section with a reference value and switches the oscillation state judgment signal from the state indicating non-oscillation to the state indicating oscillation when the accumulated number becomes equal to or more than the reference value.

4. The charge controller of claim 3 ,

wherein the oscillation state judgment section includes a pulse-width fixed conversion section which converts the control signal into a periodic signal having a constant pulse width, and

wherein the pulse integration section accumulates the number of pulses of the control signal converted so as to have the constant pulse width by the pulse-width fixed conversion section.

5. The charge controller of claim 3 ,

wherein the oscillation state judgment section includes a frequency division section which divides a frequency of the control signal, and

wherein the pulse integration section accumulates the number of pulses of the control signal, the frequency of which is divided by the frequency division section.

6. The charge controller of claim 3 ,

wherein the pulse integration section is formed of a counting circuit which increases a count value when a pulse is input and decreases the count value when the input of the pulse stops.

7. The charge controller of any of claim 1 ,

wherein the control section outputs a clear signal for stopping the activating signal generation section from generating the activating signal.

8. The charge controller of claim 7 ,

wherein the activating signal generation section maintains the state in which the generation of the activating signal is stopped even if the oscillation state judgment signal having the state indicating oscillation remains unchanged after the generation of the activating signal is stopped in response to the clear signal.

9. The charge controller of any of claim 1 ,

wherein the charge controller further includes a buffer circuit section which converts the control signal input from the external power source apparatus into a stabilized signal having a constant voltage amplitude,

wherein the control signal converted by the buffer circuit section into the stabilized signal having the constant voltage amplitude is input to the oscillation state judgment section.

10. 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.