System and method for input voltage transient response control

A method of DC/DC converting a DC input signal for use with a load, said method comprising:

• generating, via a control signal generator, a first primary side control signal, a second primary side control signal, a first secondary side control signal, a second secondary side control signal and a third secondary side control signal;
• passing, via a first primary side switch and based on the first primary side control signal, the DC input signal through a primary side winding in a positive direction to generate a first magnetic field;
• passing, via a second primary side switch and based on the second primary side control signal, the DC input signal through the primary side winding in a negative direction to generate a second magnetic field;
• generating, via a secondary side winding coupled with the primary side winding, a first current in the positive direction based on the first magnetic field;
• generating, via the secondary side winding, a second current in the negative direction based on the second magnetic field;
• passing, via a first secondary side switch, the first current to the load based on the first secondary side control signal;
• passing, via a second secondary side switch, the second current to the load based on the second secondary side control signal;
• receiving, via a voltage generating portion, receive the first current and the second current;
• generating, via the voltage generating portion, a surge voltage based on the third secondary side control signal;
• generating, via a threshold voltage providing portion, a threshold voltage;
• generating, via a feedback signal generator, a feedback signal based on the surge voltage and the threshold voltage;
• and
• modifying, via the control signal generator, one of the first primary side control signal, the second primary side control signal, the first secondary side control signal, the second secondary side control signal and the third secondary side control signal based on the feedback signal.

A DC/DC converter for use with a DC input signal and a load, said DC/DC converter comprising:

• a control signal generator operable to generate a first primary side control signal, a second primary side control signal, a first secondary side control signal, a second secondary side control signal and a third secondary side control signal;
• a primary side winding;
• a first primary side switch operable to pass, based on the first primary side control signal, the DC input signal through said primary side winding in a positive direction to generate a first magnetic field;
• a second primary side switch operable to pass, based on the second primary side control signal, the DC input signal through said primary side winding in a negative direction to generate a second magnetic field;
• a secondary side winding coupled with said primary side winding, said secondary side winding being operable to generate a first current in the positive direction based on the first magnetic field and to generate a second current in the negative direction based on the second magnetic field;
• a first secondary side switch operable to pass the first current to the load based on the first secondary side control signal;
• a second secondary side switch operable to pass the second current to the load based on the second secondary side control signal;
• a voltage generating portion operable to receive the first current and the second current and to generate a surge voltage based on the third secondary side control signal, said voltage generating portion comprising a resistor, a capacitor and a voltage generating switch, said voltage generating switch being operable to be in a first state and a second state based on the third secondary side control signal;
• a threshold voltage providing portion operable to generate a threshold voltage;
• and
• a feedback signal generator operable to generate a feedback signal based on the surge voltage and the threshold voltage, said feedback signal generator comprising a comparator operable to compare the surge voltage and the threshold voltage and to output a pulse as the feedback signal when the surge voltage is greater than the threshold voltage,
• wherein said control signal generator is further operable to modify one of the first primary side control signal, the second primary side control signal, the first secondary side control signal, the second secondary side control signal and the third secondary side control signal based on the feedback signal,
• wherein when said voltage generating switch is in the first state, said capacitor is charged by one of the first current and the second current,
• wherein when said voltage generating switch is in the second state, said capacitor is operable to discharge a stored charge through said resistor to generate the surge voltage,
• wherein said control signal generator is further operable to generate the first primary side control signal as a first pulse-width modulated primary side control signal, to generate the second primary side control signal as a second pulse-width modulated primary side control signal, to generate the first secondary side control signal as a first pulse-width modulated secondary side control signal, to generate the second secondary side control signal as a second pulse-width modulated secondary side control signal and to generate the third secondary side control signal as a third pulse-width modulated secondary side control,
• wherein said control signal generator is further operable to modify the pulse width of one of the first pulse-width modulated primary side control signal, the second pulse-width modulated primary side control signal, the first pulse-width modulated secondary side control signal, the second pulse-width modulated secondary side control signal and the third pulse-width modulated secondary side control, and
• wherein said first primary side switch comprises a field effect transistor.