Patent ID: 8418789

Claim:
A cooling system, comprising: a power source; an electric fan that is driven by the electric power from the power source and that blows air to cool a target object; a switching device that is connected to the power source and the electric fan; a voltage detection device that detects a voltage of the power source; a control device that controls the switching device so that air is supplied from the electric fan when the target object is cooled and that controls the switching device from the moment when an activation condition of the electric fan is satisfied until the moment when a cancellation condition of the electric fan is satisfied so that the higher the detected voltage is when the activation condition is satisfied, the lower the duty ratio is set; a temperature obtaining device that obtains a temperature of the target object; and a setting device that sets a target rotational speed for the electric fan based on the obtained temperature; wherein the activation condition is satisfied when the obtained temperature is at least equal to a specified temperature or higher, and wherein the cancellation condition is satisfied when the rotational speed of the electric fan reaches a prescribed rotational speed, which is lower than the target rotational speed.