高频磁刺激仪的降低功耗设计

目的：经颅磁刺激技术在精神、心理疾病治疗方面具有优势，但由于达到神经电位阈值所需的刺激能量较大，对电源功耗的要求限制了磁刺激的高频应用，设计一种磁刺激电路降低功率消耗是必要的。方法：设计了由单片机控制的两组开关．分剐控制对无极性电容的正反向充放电．通过电压检测等手段控制充放电时序；对系统软硬件的设计进行了初步实验验证，实验参数包括采用电容为25．1μF，电感为0．29mH，回路电阻为1．87n，电源输出电压最高为100V．输出功率最高为200W．刺激频率为1～100Hz，放电时间250μs。结果：磁刺激电路使用正反双向充放电电路与单向充放电电路进行对比试验，结果表明其能量消耗降低了11％。结论：设计的正反双向充放电方法可以有效降低高频磁刺激仪的功耗．提高磁刺激仪器能量利用率。

Design of Lower-Power Expenditure in High-frequency Stimulation

Objective To develop a device to reduce the power expenditure, because magnetic stimulating technology takes advantages of clinical therapies in spiritual and psychological diseases, therefore the electromagnetic energy of each pulse should be large enough to exceed the threshold of nerve action potentials, the required power of magnetic stimulation limited the application in high frequency. Methods A circuit controlled by microcomputer is proposed to ontrol two cluster switches charging or discharging the non-polar capacitor in positive and negative direction. Voltage detection is used to control the actions of charging and discharging the capacitor. Validating experiments are carried out to test the system function of the hardware and software. The parameter of the experiments is set as： L of 0.29 mH; C of 25.1 μF; R of 1.87Ω. Power output is set as 100 V and 200 W, frequency is 100 Hz and discharge time is 250 μs. Results By comparing the bidirectional charging and discharging stimulating process with the single charging and discharging stimulating process, the energy expenditure is saved 11%. C, lladutllaa This design has lower-power expenditure effectively, which goes further to improve the utilization of energy.