The present invention relates to a full-wave bridge rectifier circuit having high energy efficiency, wherein the rectifier of the present invention includes two PMOS transistors MP1 and MP2, two NMOS transistors MN1 and MN2, and two high-level comparators COMH1, COMH2) and two low-level comparators (COML1, COML2), and when an AC input below the GND level is applied to the rectifier's input terminal A, the NMOS transistor MN1 is 'turned on' so that the input terminal A goes to the GND level. When the AC input of Vdd level or higher is applied to the input terminal B, the PMOS transistor PN2 is 'turned on' so that the input terminal B becomes the Vdd level, thereby preventing latch-up, and further, according to the present invention. There is no need to consider in particular the breakdown voltage of the device, and it can be manufactured by a device manufacturing process suitable for manufacturing a device having a breakdown voltage of about 10V.
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