An apparatus for wirelessly receiving power via a magnetic field (1308, 1508) generated by a transmitter to power or charge a load (406, 506, 706, 906, 1106), the apparatus comprising: a receive circuit comprising a coil (1306, 1506, 1606, 1818) the receive circuit configured to wirelessly couple power via the magnetic field (1308,1508), a voltage induced in the receive circuit in response to the magnetic field (1308,1508) generating an alternating current in the receive circuit; a first rectifier circuit (404a, 504a,704a, 904a,1104a) electrically coupled to the receive circuit and configured to rectify the alternating current to a first direct current; a first filter circuit (410, 510, 710, 910, 1110) electrically coupled to the first rectifier circuit (404a, 504a, 704a, 904a, 1104a) and comprising an inductor and a capacitor, the first filter circuit configured to output a second direct current based on the first direct current; a second rectifier circuit (404b, 504b, 704b, 904b, 1104b) electrically coupled to the receive circuit configured to rectify the alternating current to a third direct current; and a second filter circuit (412, 512, 712, 912, 1112) electrically coupled to outputs of the first filter circuit (410, 510, 710, 910, 1110) and the second rectifier circuit (404b, 504b, 704b, 904b, 1104b), the second filter circuit (412, 512, 712, 912, 1112) comprising an inductor and a capacitor and configured to output a fourth direct current based on the second direct current and the third direct current, the fourth direct current provided to power or charge the load (406, 506, 706, 906, 1106) and wherein at least one of the first rectifier circuit (404a, 504a, 704a, 904a, 1104a) and the second rectifier circuit (404b, 504b, 704b, 904b, 1104b) comprise a rectifier topology comprising a combination of rectifier circuits, wherein the rectifier topology comprises a full bridge rectifier circuit in series with a current doubler rectifier circuit, the current doubler circuit comprising two inductors (L5, L6; L9, L10) and two diodes (D17, D18; D24, D25). a receive circuit comprising a coil (1306, 1506, 1606, 1818) the receive circuit configured to wirelessly couple power via the magnetic field (1308,1508), a voltage induced in the receive circuit in response to the magnetic field (1308,1508) generating an alternating current in the receive circuit; a first rectifier circuit (404a, 504a,704a, 904a,1104a) electrically coupled to the receive circuit and configured to rectify the alternating current to a first direct current; a first filter circuit (410, 510, 710, 910, 1110) electrically coupled to the first rectifier circuit (404a, 504a, 704a, 904a, 1104a) and comprising an inductor and a capacitor, the first filter circuit configured to output a second direct current based on the first direct current; a second rectifier circuit (404b, 504b, 704b, 904b, 1104b) electrically coupled to the receive circuit configured to rectify the alternating current to a third direct current; and a second filter circuit (412, 512, 712, 912, 1112) electrically coupled to outputs of the first filter circuit (410, 510, 710, 910, 1110) and the second rectifier circuit (404b, 504b, 704b, 904b, 1104b), the second filter circuit (412, 512, 712, 912, 1112) comprising an inductor and a capacitor and configured to output a fourth direct current based on the second direct current and the third direct current, the fourth direct current provided to power or charge the load (406, 506, 706, 906, 1106) and wherein at least one of the first rectifier circuit (404a, 504a, 704a, 904a, 1104a) and the second rectifier circuit (404b, 504b, 704b, 904b, 1104b) comprise a rectifier topology comprising a combination of rectifier circuits, wherein the rectifier topology comprises a full bridge rectifier circuit in series with a current doubler rectifier circuit, the current doubler circuit comprising two inductors (L5, L6; L9, L10) and two diodes (D17, D18; D24, D25).