Cover story
for low-power energy-harvesting applications. The data sheet shares a typical energy-harvesting application circuit (see Figure 7), powered from a piezoelectric source and being used to provide power to an ADC or an RF IC.
Energy management Another area that should be part of any discussion relating to applications with a limited power budget is energy management. This starts with developing a power budget calculation for the application prior to looking at different power management solutions. This essential step helps system designers understand the key components used in the system and how much energy they require. This impacts their decision to select a primary battery, rechargeable battery, energy harvesting, or a combination of these as the power supply methodology. The frequency of the IoT device
gathering a signal and sending it back to the central system or cloud is another important detail when looking at energy management, which has a large impact on overall power consumption. A common technique is to duty cycle the power usage or stretch the time between waking the device up to gather and/or send data. Making use of standby modes on each of the electronic devices (if available) is also a useful tool when trying to manage the system energy usage.
Conclusion As with all electronic applications, it is important to consider the power management portion of the circuit as early as possible. This is even more important in power-constrained applications such as IoT. Developing a power budget early in the process can help the system designer identify the most efficient path and suitable devices that meet the challenges posed by these applications while still achieving high energy efficiency in a small solution size.
www.analog.com
Figure 4: The LTC4162, a 3.2A buck battery charger
Figure 5: Energy sources and
approximate levels available for various applications
Figure 6: Block diagram of the ADP5090 in a harvesting application
Figure 7: ADP5304 piezoelectric source
application circuit
www.electronicsworld.co.uk July/August 2022 09
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52
