A power converter, comprising: a first terminal (a, z, m1, o2); a second terminal (c, m, o1, m2); N first transistors (Q11, Q12,..., Q1N); N first switching power stage circuits (11, 41, 42, 61, 62, 6j,..., 6N, 71), each comprising a second transistor (Q21, Q22,..., Q2N) and a first energy storage element (Cfl, Cf2, Cf3, Cfj, Cf7), wherein N is greater than or equal to 1; N second energy storage elements (Cil, Ci2, Ci3, Ci7,..., CiN), wherein the n th, 1 ≤ n ≤ N, second energy storage element (Ci1, Ci2, Ci3, Ci7,..., CiN) is coupled between the n th first switching power stage circuits (11, 41, 42, 61, 62, 6j,..., 6N, 71) and a ground; a first terminal of each of the N first switching power stage circuits (11, 41, 42, 61, 62, 6j,..., 6N, 71) is coupled to the first terminal (a, z, m1, o2) of the power converter, and a second terminal of each of the N first switching power stage circuits (11, 41, 42, 61, 62, 6j,..., 6N, 71) is connected to the second terminal (c, m, o1, m2) of the power converter; the n th first transistor (Q11, Q12,..., Q1N) is connected between the n th second energy storage element and the first energy storage element of the n th first switching power stage circuit; the n th second transistor (Q21, Q22,..., Q2N) is connected between the first terminal of the n th first switching power stage circuit and the first energy storage element of the n th first switching power stage circuit, characterized in that the power converter further comprises one second switching power stage circuit (12, 43, 6a, 72) coupled between a terminal of the Nth second energy storage element (CiN) and the second terminal (c, m, o1, m2) of the power converter, the Nth second energy storage element (CiN) is capable of serving as a power supply to supply power to the second terminal (c, m, o1, m2) of the power converter via the second switching power stage circuit, wherein each first switching power stage circuit (11, 41, 42, 61, 62, 6j,..., 6N, 71) comprises a first magnetic element (Lo1, L1, L2, Lj,..., LN, L71), and in each first switching power stage circuit, a terminal of the respective first energy storage element (Cfl, Cf2, Cf3, Cfj, Cf7) of the first switching power stage circuit is connectable to ground via a third transistor, and is connected to the second terminal (c, m, o1, m2) of the power converter via the respective first magnetic element of the first switching power stage circuit. a first terminal (a, z, m1, o2); a second terminal (c, m, o1, m2); N first transistors (Q11, Q12,..., Q1N); N first switching power stage circuits (11, 41, 42, 61, 62, 6j,..., 6N, 71), each comprising a second transistor (Q21, Q22,..., Q2N) and a first energy storage element (Cfl, Cf2, Cf3, Cfj, Cf7), wherein N is greater than or equal to 1; N second energy storage elements (Cil, Ci2, Ci3, Ci7,..., CiN), wherein the n th, 1 ≤ n ≤ N, second energy storage element (Ci1, Ci2, Ci3, Ci7,..., CiN) is coupled between the n th first switching power stage circuits (11, 41, 42, 61, 62, 6j,..., 6N, 71) and a ground; a first terminal of each of the N first switching power stage circuits (11, 41, 42, 61, 62, 6j,..., 6N, 71) is coupled to the first terminal (a, z, m1, o2) of the power converter, and a second terminal of each of the N first switching power stage circuits (11, 41, 42, 61, 62, 6j,..., 6N, 71) is connected to the second terminal (c, m, o1, m2) of the power converter; the n th first transistor (Q11, Q12,..., Q1N) is connected between the n th second energy storage element and the first energy storage element of the n th first switching power stage circuit; the n th second transistor (Q21, Q22,..., Q2N) is connected between the first terminal of the n th first switching power stage circuit and the first energy storage element of the n th first switching power stage circuit, characterized in that the power converter further comprises one second switching power stage circuit (12, 43, 6a, 72) coupled between a terminal of the Nth second energy storage element (CiN) and the second terminal (c, m, o1, m2) of the power converter, the Nth second energy storage element (CiN) is capable of serving as a power supply to supply power to the second terminal (c, m, o1, m2) of the power converter via the second switching power stage circuit, wherein each first switching power stage circuit (11, 41, 42, 61, 62, 6j,..., 6N, 71) comprises a first magnetic element (Lo1, L1, L2, Lj,..., LN, L71), and in each first switching power stage circuit, a terminal of the respective first energy storage element (Cfl, Cf2, Cf3, Cfj, Cf7) of the first switching power stage circuit is connectable to ground via a third transistor, and is connected to the second terminal (c, m, o1, m2) of the power converter via the respective first magnetic element of the first switching power stage circuit.