Patent ID: 7327178

Claim:
A timing circuit for a DC to DC converter having two MOSFET switches coupled to primary windings of an isolation transformer and two output MOSFET switches coupled to secondary windings of the isolation transformer, the timing circuit comprising: an input terminal for receiving a pulse width modulated signal that switches low at time t 1 and high at time t 4 ; a first timing output signal circuit responsive to the pulse width modulated signal and providing a first timing output signal that switches low at time t 1 and high at time t 7 to control one of the input MOSFET switches; a second timing output signal circuit responsive to the pulse width modulated signal and providing a second timing output signal that switches high at time t 3 and low at time t 6 to control the other of the input MOSFET switches; a third timing output signal circuit responsive to the pulse width modulated signal and providing a third timing output signal that switches low at time t 2 and high at time t 5 to control one of the output MOSFET switches; and a fourth timing output signal circuit responsive to the pulse width modulated signal and providing a fourth timing output signal that switches high at time t 2 and low at time t 8 to control the other of the output MOSFET switches, wherein the times t 1 through t 8 occur in sequence.