Alternating current rectifying circuit and alternating current rectifying method for driving LED module

An alternating current rectifying method for driving a light emitting diode LED module, wherein the LED module is driven by an alternating current rectifying circuit and the alternating current rectifying circuit comprises:

• an alternating current module, a positive half cycle rectifying branch, a positive half cycle feeding branch, a negative half cycle rectifying branch, a negative half cycle feeding branch, and an overvoltage protection branch, the method comprising the steps of:
• when the alternating current module is in a positive half cycle, rectifying by the positive half cycle rectifying branch an alternating current outputted from the alternating current module, and outputting a rectified voltage signal to the overvoltage protection branch and an external LED module;
• performing by the negative half cycle feeding branch charging according to the alternating current outputted from the alternating current module, and performing by the positive half cycle feeding branch discharging and outputting a discharged voltage signal to the overvoltage protection branch and the external LED module;
• and turning off by the overvoltage protection branch an electrical path of the external LED module when the inputted voltage signal is higher than a preset voltage threshold;
• and
• when the alternating current module is in the negative half cycle, rectifying by the negative half cycle rectifying branch the alternating current outputted from the alternating current module, and outputting a rectified voltage signal to the overvoltage protection branch circuit and the external LED module;
• performing by the negative half cycle feeding branch discharging, and outputting a discharged voltage signal to the overvoltage protection branch and the external LED module, and performing by the positive half cycle feeding branch charging according to the alternating current outputted from the alternating current module;
• and turning off by the overvoltage protection branch the electrical path of the external LED module when the inputted voltage signal is higher than the preset voltage threshold.