Converter for converting code-modulated power with conversion code, power transmission system, and controller

A converter comprising:

• a terminal that receives code-modulated power into which first alternating-current power has been code-modulated with a modulation code, the first alternating-current power having a first frequency;
• and
• a circuit that converts the code-modulated power with a conversion code to generate second alternating-current power having a second frequency lower than the first frequency,
• wherein the conversion code includes:
• a first partial sequence, of which bit values are respectively the same as corresponding bit values of the modulation code;
• a second partial sequence, of which bit values are respectively the same as values obtained by inverting corresponding bit values of the modulation code;
• a third partial sequence, of which bit values are respectively the same as values obtained by inverting corresponding bit values of the modulation code;
• and
• a fourth partial sequence, of which bit values are respectively the same as corresponding bit values of the modulation code, and
• wherein the circuit converts the code-modulated power into the second alternating-current power by performing code demodulation that includes:
• in a first period, code-demodulating the code-modulated power with the first partial sequence to generate a first positive current;
• in a second period, invertedly code-demodulating the code-modulated power with the second partial sequence to generate a second positive current;
• in a third period, invertedly code-demodulating the code-modulated power with the third partial sequence to generate a first negative current;
• and
• in a fourth period, code-demodulating the code-modulated power with the fourth partial sequence to generate a second negative current.