Power conversion device with a configuration to prevent a malfunction caused by a soft error
A first controller includes a first processor and a first memory. A second controller includes a second processor and a second memory. In transmitting data from the first controller to the second controller, the first controller repeatedly performs a write operation of writing transmitted data into the first memory in accordance with a clock signal, and reads the transmitted data from the first memory and outputs the transmitted data. The second controller writes the received data into the second memory in accordance with the clock signal, and reads the received data from the second memory in accordance with the clock signal. When a plurality of data values of the received data read from the second memory match each other in a plurality of consecutive clock cycles including a current clock cycle, the second controller transmits the data value of the current clock cycle to the second processor.
1 . 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.
2 . The power conversion device according to claim 1 , wherein
when all the data values in the predetermined plurality of clock cycles do not match each other, the second controller re-transmits the received data transmitted in the previous clock cycle to the second processor.
3 . The power conversion device according to claim 2 , wherein
the first module and the second module are a first power conversion module and a second power conversion module,
each of the first power conversion module and the second power conversion module includes a power converter that receives an AC power from the AC power supply and generates an AC power to be supplied to the load, and
the first controller transmits data about an operation state of the power converter in the first power conversion module to the second controller.
4 . The power conversion device according to claim 3 , wherein
the data about an operation state of the power converter in the first power conversion module includes a detected value of an output current of the power converter and information about the presence or absence of a failure in the power converter.
5 . The power conversion device according to claim 2 , wherein
the first module is a bypass module,
the second module is one of a plurality of power conversion modules, and
the first controller transmits data about configuration of the power conversion device and data about control of the plurality of power conversion modules to the second controller.
6 . The power conversion device according to claim 5 , wherein
the power conversion device is configured to selectively operate in an inverter power supply mode in which AC power is supplied from the plurality of power conversion modules to the load and a bypass power supply mode in which AC power is supplied from the AC power supply to the load via the bypass module, and
the data about the configuration of the power conversion device includes information about an operation mode of the power conversion device.
7 . The power conversion device according to claim 1 , wherein
the first module and the second module are a first power conversion module and a second power conversion module,
each of the first power conversion module and the second power conversion module includes a power converter that receives an AC power from the AC power supply and generates an AC power to be supplied to the load, and
the first controller transmits data about an operation state of the power converter in the first power conversion module to the second controller.
8 . The power conversion device according to claim 7 , wherein
the data about an operation state of the power converter in the first power conversion module includes a detected value of an output current of the power converter and information about the presence or absence of a failure in the power converter.
9 . The power conversion device according to claim 1 , wherein
the first module is a bypass module,
the second module is one of a plurality of power conversion modules, and
the first controller transmits data about configuration of the power conversion device and data about control of the plurality of power conversion modules to the second controller.
10 . The power conversion device according to claim 9 , wherein
the power conversion device is configured to selectively operate in an inverter power supply mode in which AC power is supplied from the plurality of power conversion modules to the load and a bypass power supply mode in which AC power is supplied from the AC power supply to the load via the bypass module, and
the data about the configuration of the power conversion device includes information about an operation mode of the power conversion device.