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

摘要

Disclosed are an alternating current rectifying circuit and an alternating current rectifying method for driving an LED module. The method comprises: when an alternating current module is in a positive half cycle, after an alternating current is rectified, outputting the alternating current to a positive half cycle rectifying branch circuit of an LED module; when the alternating current module is in a negative half cycle, carrying out charging according to the alternating current output by the alternating current module, and when the alternating current module is in the positive half cycle, carrying out discharging, and outputting the alternating current to a positive half cycle feed branch circuit of the LED module; when the alternating current module is in the negative half cycle, rectifying the alternating current, and outputting the alternating current to a negative half cycle rectifying branch circuit of the LED module; when the alternating current module is in the positive half cycle, carrying out charging according to the alternating current output by the alternating current module, and when the alternating current module is in the negative half cycle, carrying out discharging, and outputting the alternating current to a negative half cycle feed branch circuit of the LED module; and when a voltage of an input voltage signal is higher than a preset voltage threshold, turning off an overvoltage protection branch circuit of the LED module. By using the present invention, stability of an output voltage can be improved, and luminous efficiency of the LED module can be improved.

主权项

1. An alternating current rectifying circuit for driving a light emitting diode LED module, characterized in that, 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, wherein:
the positive half cycle rectifying branch is configured to, when the alternating current module is in a positive half cycle, rectify an alternating current outputted from the alternating current module, and output a rectified voltage signal to the overvoltage protection branch and an external LED module; the positive half cycle feeding branch is configured to perform charging according to the alternating current outputted from the alternating current module when the alternating current module is in a negative half cycle; and perform discharging and output a discharged voltage signal to the overvoltage protection branch and the external LED module when the alternating current module is in the positive half cycle; the negative half cycle rectifying branch is configured to, when the alternating current module is in the negative half cycle, rectify the alternating current outputted from the alternating current module, and output a rectified voltage signal to the overvoltage protection branch and the external LED module; the negative half cycle feeding branch is configured to perform charging according to the alternating current outputted from the alternating current module when the alternating current module is in the positive half cycle; and perform discharging and output a discharged voltage signal to the overvoltage protection branch and the external LED module when the alternating current module is in the negative half cycle; and the overvoltage protection branch is configured to turn off an electrical path of the external LED module when the inputted voltage signal is higher than a preset voltage threshold.