Share a timeless book "Power Management Basics for Dummies"

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The Power Management Basics eBook introduces the basics of power management, as well as the latest trends and applications. Here are some highlights from this eBook:

1.DC battery configuration

The type of power source that an electronic device uses depends on the type of power management subsystem. These sources include AC, DC, or ultra-low power DC sources, such as solar. Many devices have DC power from a single battery or a battery pack containing multiple cells. These batteries can be connected in different ways to provide different current and voltage outputs. For example:

Power Management Fundamentals For Dummies

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• Using batteries in series can increase the peak voltage and capacity of the battery pack.
• Using parallel cells does not increase the voltage of the battery pack, but it can increase its overall current capability and capacity.
• Using both series and parallel cells can increase voltage, current and capacity.

2. Types of DC voltage regulators

In some battery-powered applications, system components may not be able to use battery power directly, and a DC-DC converter is needed to monitor and stabilize the voltage supplied to the system. These converters are also called voltage regulators because they can stabilize the supplied voltage. Voltage regulators can be divided into two types based on the voltage conversion method used.

• Linear regulators use linear (resistive) components to stabilize V _out , converting an input voltage (V _in ) to a different output voltage (V _out ). They are typically used in low power output applications. Linear regulators provide low noise output, so they are suitable for sensitive analog components such as sensors. The disadvantage is that they are not very efficient.
  
• In contrast, switching regulators are efficient, flexible, and small, but they emit high-frequency noise. Switching regulators use field-effect transistors (FETs) to convert a DC input voltage into an AC waveform, which is then converted to a different DC output voltage using capacitors and inductors.

3. Switching Regulator

Switching regulators are classified according to the relationship between their input and output voltages.

• Step-down switching regulator : V _out is lower than V _in .
• Boost switching regulator : V _out is higher than V _in .
• Buck-boost switching regulator: V _out is variable: it may be lower, higher, or equal to V _in .

The figure below compares four commonly used regulator topologies: low-dropout linear regulator (LDO) and three switching regulators (buck, boost, and buck-boost).

4. Today’s Power Management Integrated Circuits (PMICs)

A PMIC is a small, multi-function integrated circuit that implements voltage conversion, voltage regulation, and battery management. Today’s PMICs can handle many or even all of the application voltage regulation functions required in electronic devices. They can be used in different applications with simple changes to firmware or register settings, without the need to implement costly hardware changes. This helps implement new applications faster and at a lower cost.

PMICs are used in many different industries and product types. They can provide a variety of functions, including intelligent motor control and power protection, as well as DC-DC voltage conversion and regulation. PMICs are small and low-power, and can be used in many small devices such as wearables, "hearables" (such as earbuds), mobile devices, sensors, and Internet of Things (IoT) devices. They can significantly improve the performance and efficiency of products, increase their design flexibility, and reduce bill of materials costs, helping manufacturers reduce total costs and accelerate time to market.

木犯001号

Good book! Thanks for sharing~

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