US-20260128620-A1 - POWER SUPPLY SYSTEM

US20260128620A1US 20260128620 A1US20260128620 A1US 20260128620A1US-20260128620-A1

Abstract

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.

Inventors

Seizo ITONAGA
Hiroyasu Tomita

Assignees

MURATA MACHINERY, LTD.

Dates

Publication Date: 20260507
Application Date: 20230815
Priority Date: 20221006

Claims (7)

1 - 6 . (canceled)
7 : 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.
8 : The power supply system according to claim 7 , 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.
9 : The power supply system according to claim 7 , wherein each of the first value and the second value is single bit information.
10 : The power supply system according to claim 7 , 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.
11 : The power supply system according to claim 7 , 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.
12 : The power supply system according to claim 7 , 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.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to power supply systems. 2. Description of the Related Art As a conventional power supply system, the system described in Japanese Unexamined Patent Publication No. 5901861 for example, is known. The power supply system described in Japanese Unexamined Patent Publication No. 5901861 includes one main power converter and one or more sub power converters. Each of the power converters includes a time counter and a carrier wave generator configured to generate carrier waves in synchronization with the time counter. The main power converter includes a synchronization data generation section configured to generate synchronization data to synchronize a value of a sub time counter with the main time counter when the time counter reaches a predetermined value, and a communication section configured to transmit the synchronization data to the sub. The sub power converter includes a communication section configured to receive the synchronization data, a time counter correction processing section configured to correct a time counter value based on the synchronization data, a current sensor configured to detect output current of the sub power converter, and a gate timing adjustment section configured to advance or delay a phase of a gate signal of the sub power converter based on an annular current component. SUMMARY OF THE INVENTION In conventional power supply systems, synchronization data generated in a synchronization data generation section of a main power converter includes communication time. In the case where the synchronization data includes communication time, it takes time to generate the synchronization data and also to receive the synchronization data. Therefore, in the case of being used for a high frequency power supply, when synchronization control performed in a shorter time is required, for example, appropriate synchronization control may not be achieved. Example embodiments of the present invention provide power supply systems each capable of accelerating synchronization control between a plurality of power supply devices. A power supply system according to an example embodiment of the present invention is a power supply system including a first power supply device configured to generate AC current, and at least one second power supply device 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. In a power supply system according to an example embodiment of the present invention, 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, and compare the count value of the timer counter at that timing with the determination value. The at least one second power supply device is configured to make the cycle of the timer counter shorter than the predetermined cycle when the count value is smaller than the determination value, and make the cycle of the timer counter longer than the predetermined cycle when the count value is larger than the determined value. As described above, in the power supply system, information (data and signals) transmitted from the first power supply device to the at least one second power supply device is a square wave, and thus the time required to create information for synchronization control in the first power supply device can be reduced and also the time required to receive the information in the second power supply device can be reduced. In addition, in the power supply system, it is possible to reduce the time from when the timer counter reaches or exceeds the threshold to when the interrupt processing occurs, thus making it possible to synchronize the first power supply device and the at least one second power supply device in a short time (at a high speed). Therefor