A multi-function driving circuit design with feedback control for phototherapy and electrical stimulation system

• Main Authors: Yuan Ho, 賀淵
• Other Authors: Tai-Ping Sun
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/40125179523995416982

碩士 === 國立暨南國際大學 === 生物醫學科技研究所 === 96 === This thesis presents a multi-function driving circuit design with feedback control for phototherapy and electrical stimulation system. It is an all-in-one therapeutic instrument. It includes LCD component, switch circuit and constant current driving circuit. It has been designed by PIC to make up a multi-functional therapy system with light and electrical stimulation for medical application. This text will recommend the treatment of the light and electrical stimulation( micro current electrical stimulation ) to develop at first and overall system structure and theory secondly. Then, we have explained the sub circuit in the system structure, for instance: the driving circuit design and how to reject the offset voltage of op Amp. The phototherapy which is red, blue and green light has different power (under the frequency= 100Hz, duty cycle= 6% and current= 100mA) 12.34mW/cm2, 11.92 mW/cm2, 7 mW/cm2. separately. In this condition(frequency= 100Hz, duty cycle= 6% and current= 100mA ), we can find the better efficiency. After calculation, it can reach the record in the other paper. Micro-current electrical stimulation works at different constant current under frequency= 100Hz and we can find the better linearity at various loading resistance.