Image forming apparatus and power control method for the same

An image forming apparatus including a first controller and a second controller that at least perform image processing, a third controller, and a memory, the image forming apparatus being capable of transitioning to a standby state, a suspend state that is a power saving state where current is applied to the memory and a fast start can be made, and a hibernation state that is a power saving state where current is not applied to the memory, the image forming apparatus comprising:

• the first controller configured to, in a case where the first controller receives an end process event, perform control to load a program for the second controller into the memory and cause the image forming apparatus to transition to the suspend state;
• the second controller configured to, in a case where the image forming apparatus transitions to the suspend state and a predetermined condition is satisfied, perform control to cause the image forming apparatus to transition to the hibernation state;
• and
• the third controller configured to, in a case where the third controller receives a return process event, return the image forming apparatus from a power saving state to the standby state,
• wherein in a case where the third controller determines that the image forming apparatus is to return from the hibernation state, the third controller performs control to load the program for the second controller into the memory after current is applied to the memory and return the image forming apparatus to the standby state by the second controller reading the loaded program.

A control method for controlling an image forming apparatus including a first controller and a second controller that at least perform image processing, and a memory, the image forming apparatus being capable of transitioning to a standby state, a suspend state that is a power saving state where current is applied to the memory and a fast start can be made, and a hibernation state that is a power saving state where current is not applied to the memory, the control method comprising:

• receiving an end process event,
• in a case where it is determined that transition to the hibernation state is enabled, performing control to cause the image forming apparatus to transition to the hibernation state, and
• in a case where it is determined that transition to the suspend state is enabled, performing control to:
• load a program for the second controller into an outside-OS-management area on the memory,
• turn off application of current to the second controller, and
• cause the image forming apparatus to transition to the suspend state.

A control method for controlling an image forming apparatus including a first controller and a second controller that at least perform image processing, and a memory, the image forming apparatus being capable of transitioning to a standby state, a suspend state that is a power saving state where current is applied to the memory and a fast start can be made, and a hibernation state that is a power saving state where current is not applied to the memory, the control method comprising:

• in a case where an end process event is received, performing control to load a program for the second controller into the memory and cause the image forming apparatus to transition to the suspend state;
• in a case where a predetermined time elapses after the image forming apparatus transitions to the suspend state, performing control to cause the image forming apparatus to transition to the hibernation state;
• in a case where a return process event is received, returning the image forming apparatus from a power saving state to the standby state, and
• in a case where the image forming apparatus is to return from the hibernation state, loading the program for the second controller into the memory after current is applied to the memory and returning the image forming apparatus to the standby state by the second controller reading the loaded program.