| 摘要 |
PURPOSE: A controller protection circuit is provided, which can prevent a PCB(Printed Circuit Board) from being damaged due to an overcurrent. CONSTITUTION: The circuit comprises PTC(Positive Temperature Coefficient) devices(10a,10b) to protect an electronic controller built on a heavy equipment vehicle from an overcurrent. The first and the second PTC device(10a,10b) are connected to both ends of a power supply line supplied from the external respectively, and the supply power is supplied to a supply power processing unit(12). The supply power processing unit converts the power from the external into a fixed level and includes a constant voltage circuit. And the circuit comprises a controller(14) generating a control signal according to a stored program in a memory, and an LED display part(16) to display an operation state of the device and a button input unit(18) to receive an input from a user. A motor driving unit(20) drives a motor comprised in the external by receiving the control signal from the controller, and a clock generation unit(22) provides a clock signal to the controller. And a blower driving unit(24) drives a blower comprised in the external by receiving the control signal from the controller.
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