Patent ID: 8335096

Claim:
A rectifier less ac to dc converter comprising: an ac power source having an ac input node and a ground node; and a small resistance value sense resistor coupled between the said ac input node and a voltage sense node; and a high frequency current bypass capacitor is coupled between said voltage sense node and the said ground node; and a power inductor is connected between said voltage sense node and a switching output node; and a power pmos transistor having a pmos source is connected to a positive vcc voltage node, and having a pmos drain is connected to the said switching output node, and having a pmos gate node; and a power nmos transistor having a nmos source is connected to a negative vee voltage node, and having a nmos drain is connected to the said switching output node, and having a nmos gate node; and a pulse width modulation generation circuit couples a pair of low supply current shoot through gate voltage switching signals to the said pmos gate node and the said nmos gate node ; and the said pulse width modulation generation circuit has an effective duty cycle which defines the voltage at the said voltage sense node; and an input current measuring means is connected across the said small resistance value sense resistor; and said input current measuring means adjusts the said effective duty cycle of the said pulse width modulation generation circuit; such that a secondary ac output coil sees an equivalent load impedance connected across it which has a current to voltage relationship to be that of an equivalent simulated resistor; and an efficient power transfer takes place between the said secondary ac output coil, into the said equivalent simulated resistor, and on to both equally the said positive vcc voltage node and the said negative vee voltage node.