Ventilation Device Current Detection Across Wide Motor Current Range

The system dynamically adjusts the amplification factor based on the detected current magnitude. When the current is large, a lower amplification factor is selected to keep the output voltage within the microcomputer's allowable range. When the current is small, a higher amplification factor is selected to maintain detection accuracy. This dynamic adjustment resolves the contradiction between achieving high detection accuracy and maintaining output voltage within acceptable limits.

The patent changes the amplification factor parameter to have multiple discrete values that can be selected based on operating conditions. By providing amplification circuits with different amplification factors and switching between them, the system ensures that the output voltage remains within the microcomputer's allowable voltage range while maintaining the necessary detection accuracy for the current level being measured.

The patent introduces dynamic switching between multiple amplification factors based on the current magnitude. The control circuit monitors the current level and automatically selects the appropriate amplification factor, making the system adaptive to different operating conditions. This dynamic approach improves current detection accuracy across the entire current range while adding manageable complexity through automated control.

The patent segments the current detection range into multiple intervals, each associated with a specific amplification factor. By dividing the wide current range into smaller segments and assigning an optimized amplification factor to each segment, the system achieves high detection accuracy across the entire range. The switching circuit automatically selects which segment is active based on the current magnitude, effectively managing the complexity through structured segmentation.