How to reduce the power consumption of wireless energy harvesting sensors when they work
Wireless energy harvesting sensors need to minimize power consumption while working. This can be achieved by carefully balancing the device's duty cycle with the low-power shutdown mode. Let me introduce the following specifically.
Depending on the response time of the application itself, the sensor needs to send measured sensor information frequently or occasionally. The longer the time interval between two work cycles, the lower the average power consumption and the less energy actually used.
The sensor may also need to capture multiple data samples between two radio transmissions. More or less current can be consumed depending on the actual physical information captured. Typical examples include op amps and bridge load cells that require considerable current during operation (relative to current consumption when transmitting RF data).
Special attention needs to be paid to the actual wireless RF transmission configuration. Parameters such as amplitude or frequency modulation, information transmission rate (bit rate and/or frequency deviation), and antenna RF output power all have a large impact on total power consumption. The shorter the working time, the lower the average power consumption – this rule of thumb applies here as well.
In addition, the system needs to be carefully designed to eliminate all unnecessary power consumption, such as avoiding the LEDs always lit. The processor must be in a low power state for as long as possible. All other devices on the board must be in low-power standby mode when not in use.
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