Patent ID: 7016209

Claim:
A single stage AC/DC converter with piezo transformer suitable for converting an AC power into a DC power, comprising: a rectification module, having a pair of rectification input terminals, a first rectification output terminal and a second rectification output terminal, wherein the pair of rectification input terminals receives the AC power and converts the AC power into a rectification output signal which is then output from the first rectification output terminal; a switching module, comprising: a bulk circuit, having a bulk input terminal, a first bulk output terminal and a second bulk output terminal, wherein the bulk input terminal electrically couples to the first rectification output terminal for receiving the rectification output signal, and a bulk signal is generated from the first bulk output terminal after the rectification output signal is processed by the bulk circuit; a half-bridge circuit, having a first half-bridge input terminal, a second half-bridge input terminal and a half-bridge output terminal, wherein the first half-bridge input terminal electrically couples to the first bulk output terminal, and the second half-bridge input terminal electrically couples to the second rectification output terminal; a first switching diode, wherein an anode electrode of the first switching diode electrically couples to the second half-bridge input terminal, and a cathode electrode of the first switching diode electrically couples to the second bulk output terminal; and a second switching diode, wherein an anode electrode of the second switching diode electrically couples to the second bulk output terminal, and a cathode electrode of the second switching diode electrically couples to the half-bridge output terminal; a driving module, electrically coupling to the second bulk output terminal and the half-bridge output terminal of the switching module for blocking a DC bias output from the half-bridge output terminal, and generating a driving signal after the signal obtained from blocking the DC bias is resonated; a piezo transformer, generating a corresponding piezo transforming signal according to the driving signal; and an output rectification module, having a rectification circuit and an output load, wherein the rectification circuit rectifies the piezo transforming signal and outputs the DC power from both sides of the output load.