Current estimation in a power converter

Current detection circuitry for generating an average inductor current signal indicative of an average inductor current during an operational cycle of power converter circuitry, the current detection circuitry comprising:

• circuitry for applying a ripple current estimate signal indicative of an estimate of half of a ripple current in the power converter circuitry to a peak inductor current signal, indicative of a peak inductor current during the operational cycle, wherein the ripple current is equal to a difference between the average inductor current and the peak inductor current,
• wherein the circuitry for applying the ripple current estimate signal comprises comparison circuitry for performing a comparison of a first period equal to half the duration of a charging phase of the power converter circuitry to a second period equal to a time taken for the inductor current in the power converter circuitry to reach the average current threshold,
• wherein the ripple current estimate signal is based, at least in part, on a result of the comparison.