Power conversion device with a configuration to prevent a malfunction caused by a soft error

A power conversion device comprising:

• a first module and a second module connected in parallel between an AC power supply and a load;
• a first controller and a second controller provided corresponding to the first module and the second module, respectively;
• a communication line that communicatively connects the first controller and the second controller,
• wherein the first controller includes a first processor, and a first memory that temporarily stores a program to be executed by the first processor and data to be used by the first processor,
• the second controller includes a second processor, and a second memory that temporarily stores a program to be executed by the second processor and data to be used by the second processor,
• wherein data is related to operation parameters of the power conversion;
• and in transmitting data from the first controller to the second controller:
• the first controller repeatedly performs a write operation of writing transmitted data into memory cells of the first memory in accordance with a clock signal, wherein each cell is storing a bit of the data and is updated at every clock cycle of the clock signal, reads the transmitted data from the first memory in accordance with the clock signal, and outputs the transmitted data to the communication line,
• the second controller writes received data received from the communication line into memory cells of the second memory in accordance with the clock signal, and reads the received data from the second memory according to the clock signal,
• when all data values of the received data read from the memory cells of the second memory in a predetermined plurality of consecutive clock cycles including a current clock cycle match each other, the second controller transmits the received data of the current clock cycle to the second processor.