Power supply system
In a non-contact power supply system, each of a main power supply device and a sub power supply device includes a timer counter. The main power supply device transmits a square wave to the sub power supply device. The sub power supply device performs interrupt processing when a value of the square wave transmitted from the main power supply device changes to compare a count value of the timer counter at that timing with a determination value, and when the count value is smaller than the determination value, makes a carrier cycle of the timer counter shorter than a predetermined cycle, and when the count value is greater than the determination value, makes the cycle of the timer counter longer than the predetermined cycle.
1 . A power supply system comprising:
a first power supply device configured to generate AC current; and
at least one second power supply device each configured to generate AC current synchronized with a phase of the AC current of the first power supply device; wherein
each of the first power supply device and the at least one second power supply device includes a timer counter to count at a predetermined cycle, and generate AC current based on a count value of the timer counter;
the first power supply device is configured to transmit, to the at least one second power supply device, a square wave having a first value when the count value of the timer counter is less than a threshold and a second value when the count value is greater than or equal to the threshold; and
the at least one second power supply device is configured to:
perform interrupt processing at a timing at which a value of the square wave transmitted from the first power supply device changes to compare the count value of the timer counter with a determination value;
make a cycle of the timer counter shorter than the predetermined cycle when the count value is smaller than the determination value; and
make a cycle of the timer counter longer than the predetermined cycle when the count value is larger than the determination value.
2 . The power supply system according to claim 1 , wherein the determination value is a value set based on a communication time required for communication between the first power supply device and the at least one second power supply device and the threshold.
3 . The power supply system according to claim 1 , wherein each of the first value and the second value is single bit information.
4 . The power supply system according to claim 1 , wherein the at least one second power supply device is configured to:
make the cycle of the timer counter shorter by a predetermined amount than the predetermined cycle when the count value is smaller than the determination value;
make the cycle of the timer counter longer by a predetermined amount than the predetermined cycle when the count value is greater than the determination value; and
after changing the cycle of the timer counter, when the count value is equal to the determination value, return the cycle of the timer counter to the predetermined cycle.
5 . The power supply system according to claim 1 , wherein each of the first power supply device and the at least one second power supply device is configured to supply power in a non-contact manner.
6 . The power supply system according to claim 1 , wherein
each of the first power supply device and the at least one second power supply device is set by switching control performed in each of the plurality of power supply devices;
a number is set for each of the first power supply device and the at least one second power supply device; and
switching to the first power supply device or the at least one second power supply device is performed based on a presence or absence of a power feed, and the number.