The invention discloses an
alternating current rectifying circuit and an
alternating current rectifying method for driving a light-emitting
diode (LED) module. The method comprises that after an
alternating current is rectified, and the rectified alternating current is output to a positive
half cycle rectifying
branch circuit of the LED module when an alternating current module is in a positive
half cycle. When the alternating current module is in a negative
half cycle, charging is carried out according to the alternating current output by the alternating current module, and when the alternating current module is in the positive half cycle, electro-
discharge is carried out, and the alternating current is output to a negative half cycle rectifying
branch circuit of the LED module. When the alternating current module is in the negative half cycle, the alternating current is rectified, and the alternating current is output to a positive half cycle rectifying
branch circuit of the LED module. When the alternating current module is in the negative half cycle, the electro-
discharge is carried out, and the alternating current is output to a negative half cycle feed branch circuit of the LED module. When an output
voltage signal is higher than a preset
voltage threshold value, an
overvoltage protection branch circuit of the LED module is shut off. By means of the alternating current rectifying circuit, stability of output
voltage can be improved, and luminous efficiency of the LED module is improved.