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Bi-directional Inductive Power Transfer (IPT) systems essentially require some form of synchronization between loads (pick-ups) and the main or primary power source. This paper presents a novel technique that can be used to synchronize pickups of a bi-directional IPT system with the primary converter (source). The proposed technique monitors the real (P) and reactive (Q) power generated by the corresponding pickup converter and conditioning it to follow a predetermined value, therefore forcing the pickup converter to operate in synchronization with the primary converter. A detailed analysis of the proposed technique is presented to verify its stability under different operating conditions. The viability of the technique, which is applicable to both single and multiple pick-up bi-directional IPT systems, is demonstrated through simulations of a 1.5 kW system.