Switching power source

A switching power source, comprising:

• a first transistor having a first terminal, a second terminal, and a gate terminal, the first terminal of the first transistor being connected to a positive electrode of a DC voltage source;
• a second transistor having a first terminal, a second terminal, and a gate terminal, the first terminal of the second transistor being connected to the second terminal of the first transistor and the second terminal of the second transistor being connected to a negative electrode of the DC voltage source;
• a first gate signal generator connected between the first terminal of the first transistor and the gate terminal of the first transistor;
• and
• a second gate signal generator connected between the second terminal of the second transistor and the gate terminal of the second transistor, the first transistor and the second transistor being alternately placed in conducting state with the first and second gate signal generators,
• wherein a gate signal is applied from the first gate signal generator to the gate terminal of the first transistor with reference to a voltage of the first terminal of the first transistor,
• a gate signal is applied from the second gate signal generator to the gate terminal of the second transistor with reference to a voltage of the second terminal of the second transistor, and
• the first transistor and the second transistor are configured with wide bandgap semiconductors of mutually different materials, respectively, the first transistor is configured with diamond or cubic boron nitride, and the second transistor is configured with SiC or GaN.