| 摘要 |
PURPOSE:To predict the end point of the service life of an electrolytic capacitor by calculating the remaining time of service life of the electrolytic capacitor based on the detecting temperature of a temperature detecting means and data of a memory means. CONSTITUTION:In the first place, microcomputers 11, 11A measure the peripheral temperature of an electrolytic condenser for every predetermined time via a temperature detecting means 3 and a timer means 13. The microcomputers 11, 11A obtain the average value of the peripheral temperature and sequentially writes the value into a memory means 4. Then, the remaining time of the service life of the electrolytic capacitor is obtained via an operating means 5, which is sequentially written into the memory means 4. The calculated remaining time is displayed on a time display means 6A. At the same time, the remaining time is compared with a preset predetermined time through a CPU 12 to judge whether a predetermined condition is satisfied. In the case where the condition is not satisfied, the detecting operation is repeated. If the condition is satisfactory, an informing means 8 informs that the electrolytic capacitor should be changed. |
