Leakage current detection and protection device

A leakage current detection device for an AC power source, comprising:

• a switching module coupled between a power input terminal and a power output terminal, for controlling electrical connection between the power input and power output terminals;
• a leakage current detection module including a leakage current detector ring for detecting a leakage current signal and a switch driving component, the leakage current detection module being configured to control the switching module based on working periods of the switch driving component and based on whether a leakage current signal is detected;
• and
• a first self testing module, coupled to the leakage current detection module, configured to periodically generate a self testing pulse signal as a simulated leakage current signal to be detected by the detector ring, wherein the first self testing module includes a periodic timing circuit and a self testing pulse signal generating circuit coupled to each other, wherein the periodic timing circuit controls a period of the self testing pulse signal,
• wherein the self testing pulse signal generating circuit includes a switching device, wherein the periodic timing circuit is coupled to the switching device to control a conductive state of the switching device, wherein the switching device generates the self testing pulse signal when it is controlled by the periodic timing circuit to be conductive, and wherein a timing component of the periodic timing circuit is discharged via the leakage current detection module or via the leakage current detection module and a first discharge path.