Switch mode power supply system with zero voltage switching

A method comprising:

• providing a control signal to a switch of a power converter;
• receiving a first signal indicative of an input voltage to the power converter;
• receiving a second signal indicative of an output voltage of the power converter;
• receiving a third signal indicative of whether a voltage across a switch of the power converter is zero when the control signal changes states;
• adjusting a timing of the control signal responsive to the first, second, and third signals;
• and
• providing the control signal having the adjusted timing to the switch.

An apparatus comprising:

• a power converter having a positive input, a negative input, a positive output, and a negative output, the power converter including a first switch, a second switch, and an inductor, the first switch and the second switch coupled in series between the positive and negative outputs, and a first current terminal of the first switch coupled to a second current terminal of the second switch and the inductor, the first switch having a first control terminal, and the second switch having a second control terminal;
• a first circuit having a first input, a second input, and a first output, the first and second inputs coupled to, respectively, the positive and negative inputs of the power converter, and the first circuit configurable to provide, at the first output, a first signal representing an input voltage to the power converter;
• a second circuit having a third input, a fourth input, and a second output, the third and fourth inputs coupled to, respectively, the positive and negative outputs of the power converter, and the second circuit configurable to provide, at the second output, a second signal representing an output voltage to the power converter;
• a third circuit having a fifth input, a sixth input, a seventh input, and a third output, the fifth input and the seventh input coupled across the first switch, the sixth input coupled to the first control terminal of the first switch and to the second control terminal of the second switch, and the third circuit configurable to provide, at the third output, a third signal indicating whether whether a voltage across the first switch is zero when the first control terminal switches states or whether a voltage across the second switch is zero when the second control terminal switches states;
• and
• a controller circuit having a first control input, a second control input, a third control input, a first control output, and a second control output, the first control input coupled to the first output, the second control input coupled to the second output, the third control input coupled to the third output, the first control output coupled to the first control terminal of the first switch, the second control output coupled to the second control terminal of the second switch, and the controller circuit configurable to:
• provide a first control signal at the first control output;
• provide a second control signal at the second control output;
• and
• adjust a timing of the first control signal and a timing of the second control signal responsive to the first, second, and third signals;
• and
• provide the first control signal having the adjusted timing at the first control output;
• and
• provide the second control signal having the adjusted timing at the second control output.