Patent ID: 8134371
Filing Date: 2012-03-13
Classification: G01R

Abstract:
1. A signal generating circuit for detecting ground status, comprising: a power supply unit A for being inputted a power source, wherein said power supply unit A comprises a neutral wire, a hot wire, and a ground wire; a resistor unit B provided to obtain a reference potential, wherein an input end of said resistor unit B is electrically connected to at least one of said neutral wire, and hot wire of said power supply unit A; a signal detection and process unit D, which comprises a signal detection circuit and a signal process circuit; and a step down DC power supply unit C connected to said power supply unit A, wherein said power source is inputted into said power supply unit A to pass through said step down DC power supply unit C to obtain a DC power source for said signal detection and process unit D, wherein said power supply unit C is further electrically connected to said resistor unit B and said signal detection and process unit D, so that said signal detection circuit of said signal detection and process unit D generates a ground status signal related to said reference potential of said resistor unit B, and said signal process circuit of said signal detection and process unit D outputs said ground status signal to show the ground status; wherein said resistor unit B comprises a plurality of resistors, wherein said resistors are connected to each other either in parallel or in series; wherein said resistor unit B comprises a resistor R A , a resistor R B , a resistor R C , and a resistor R D , wherein said resistor R A is connected to said resistor R B in series, and said resistor R C is connected to said resistor R D in series, wherein said resistors R A , R B in series is parallely connected to said resistors R C , R D in series.