Electromagnetic vibration energy harvesting (EMEH) has become a green solution to the problem of long-lasting power supply for wireless sensors due to its high efficiency, and synchronized switching solutions for electromagnetic sources significantly increase the output power in electromagnetic energy harvesting. In this paper, a self-powered electromagnetic energy extraction circuit (SP-EEEC) for electromagnetic energy harvesting is proposed. The circuit performs zero-crossing detection and switching control employs small series sampling circuits and logic gates. The control unit detects zero-crossings (capturing both negative-to-positive and positive-to-negative transitions) of the electromotive force and controls the on and off of the switch accordingly. This aligns the current phase with the induced equivalent voltage source, which improves the power factor and increases the output power with the same excitation. The SP-EEEC circuit uses less switching action than conventional PWM-based AC/DC rectifiers. Its self-powered design makes it a passive AC-DC rectifier, which is very favorable in practical applications. In this paper, the working principle of the SP-EEEC circuit are presented, supported by theoretical analysis and simulation. Simulation results show that the SP-EEEC circuit outperforms standard diode bridge rectifiers, especially in low frequency and low load energy harvesting scenarios.