Sumitomo has filed a patent for an ozonizer control device that uses feedback control to adjust the power source output of an ozone generator based on the detected ozone concentration. The device stores functions indicating the relationship between power source output and ozone concentration at different gas flow rates. This allows for precise control of ozone generation. GlobalData’s report on Sumitomo gives a 360-degree view of the company including its patenting strategy. Buy the report here.
According to GlobalData’s company profile on Sumitomo, bioethanol production GMOs was a key innovation area identified from patents. Sumitomo's grant share as of September 2023 was 30%. Grant share is based on the ratio of number of grants to total number of patents.
Control device for feedback control of an ozonizer
A recently filed patent (Publication Number: US20230271832A1) describes an ozonizer that includes a power supply and an ozone generator. The ozonizer is designed to generate ozone gas based on the power source output of the power supply. The ozonizer also includes a concentration detector that detects the concentration of ozone in the generated ozone gas.
The patent claims that the ozonizer includes a control device with a storage that stores two or more functions. These functions indicate the relationship between the power source output and the corresponding ozone concentration at different gas flow rates in the ozone generator. The control device uses these functions, along with the detected ozone concentration and an index indicating the gas flow rate, to execute feedback control. This feedback control adjusts the power source output based on the difference between a set ozone concentration and the detected ozone concentration.
Additionally, the patent claims that the storage in the ozonizer can store three or more functions corresponding to different gas flow rates. Each of these functions is obtained by linearly connecting multiple points that indicate a power source output and the corresponding ozone concentration.
The control device in the ozonizer also executes feedforward control under certain conditions. If the index indicating the gas flow rate changes by a value equal to or more than a predetermined value, or if the set ozone concentration changes by a value equal to or more than a predetermined value, the control device brings the power source output closer to the first power source output.
Furthermore, the control device in the ozonizer can execute an automatic acquisition operation. This operation automatically acquires the functions by detecting the detected ozone concentration while changing the gas flow rate.
In summary, the filed patent describes an ozonizer with a control device that uses feedback control and feedforward control to adjust the power source output based on the detected ozone concentration and the desired ozone concentration. The ozonizer also includes a concentration detector and a storage that stores functions indicating the relationship between the power source output and the ozone concentration at different gas flow rates. The patent also mentions the ability of the control device to automatically acquire these functions by detecting the ozone concentration while changing the gas flow rate.