| 摘要 |
The present invention relates to a self reset device and, more specifically, to a reset device, which can restart the system stably without an error by supplying AC power in a state that a main control unit is completely discharged after cutting the AC power by itself when the system satisfies reset conditions. According to an embodiment of the present invention, a self reset device includes: an AC switch which supplies or shuts off AC power input from the outside by a supply signal or a block signal; a DC power unit which converts the AC power input through the AC switch into DC voltage and outputs the DC voltage; a main control unit which operates by the DC voltage output from the DC power unit and outputs a pulse signal when reset conditions are satisfied; a photo coupler which outputs the pulse signal from the main control unit to a buffer in a state of insulating the main control unit from the buffer; the buffer which is connected to the collector of a photo transistor forming the photo coupler to output a standardized pulse signal of a logic′H′state or a logic′L′state without inversion; and a microcomputer which checks a logic state of the pulse signal output from the buffer, and which outputs a block signal to the AC switch when the logic state of the pulse signal changes from the′H′state to the′L′state and outputs a supply signal to the AC switch when the logic state of the pulse signal changes from the′L′state to the′H′state. |
