| 摘要 |
PURPOSE:To surely, safely detect unappropriate load and conduct continuous slow hire heating and keeping warm by performing no-load detecting operation in which a switching element repeats discriminating on-time of arm aluminium pan and no-load for a specified period. CONSTITUTION:Discriminating on-time Tond2 minimally necessary to aluminium pan detection and discriminating on-time Tond2 minimally necessary to no-load detection are specified in specifying parts 24, 23 respectively. When set on-time of switching element 5, 6 is less than Tond2, on-time is increased to continue aluminium pan detection for a fixed time until on-time is increased to Tond2 and no-load detection is conducted during a fixed time. After that, no-load detection operation which returns on-time to the original set on-time is repeated at intervals of a fixed period. Since detection operation time is set very short compared with the fixed time of repeating, detection of an unappropriate load such as no-load and aluminium pan can be can be performed without limitation of a set input range. |
