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Drone power management solution
The so-called power management refers to how to effectively allocate power to different components of the system. Power management is critical for mobile devices that rely on battery power. By reducing the energy consumption when the component is idle, an excellent power management system can double or triple battery life. Power management technology is also called power control technology.
The main power management devices on the market today include discrete power management chips PMICs and integrated power management units PMUs. The power management integrated circuits (Power Management Integrated Circuits) are chips responsible for the transformation, distribution, detection, and other power management of electrical energy in the electronic equipment system. It is mainly responsible for identifying the amplitude of the CPU power supply, generating a corresponding short moment wave, and promoting the power output of the subsequent circuit. The power management chip has both in-line and surface-mount packages. The power management chip has a wide range of applications. The development of a power management chip is of great importance for improving overall performance. The choice of a power management chip is directly related to the needs of the system.
The scope of power management is relatively wide, including separate power conversion (mainly DC to DC, ie, DC/DC), separate power distribution and detection, and a system that combines power conversion and power management. Correspondingly, the classification of the power management chip also includes these aspects, such as a linear power chip, a voltage reference chip, a switching power supply chip, an LCD drive chip, an LED drive chip, a voltage detection chip, and a battery charge management chip. If the designed circuit requires high noise and ripple suppression of the power supply, it requires a small PCB board area (such as mobile phones and other handheld electronic products), the circuit power supply does not allow the use of inductors (such as mobile phones), the power supply needs to have instantaneous calibration and output The state self-check function requires regulator voltage drop and its own low power consumption, low line cost and simple solution, then the linear power supply is the most appropriate choice.
This power supply includes the following technologies: precision voltage reference, high performance, low noise op amp, low dropout regulator, low quiescent current. The Power Management Unit (PMU) is a highly integrated power management solution for portable applications. It integrates devices such as traditional discrete power management chips into a single package, enabling higher power supplies. Conversion efficiency and lower power consumption, and fewer component counts to accommodate reduced board space.
PMU's role in UAV power management:
The more and more extensive use of PMU in UAV products has the following main functions.
1. Provide stable and reliable power supply to each component of UAV.
2. PMU helps to reduce the power consumption of the entire system, and enables the drone battery to have a longer use time by reducing the power consumption when the component is idle.
3. PMU has better signal-to-noise ratio and transient response, which can better prevent the drone from being affected by the external environment and fast transient response.
4. The characteristics of PMU integration can save internal structural space, contribute to the miniaturization of products, and have better cost advantages and the unification and ordering of the entire system power supply system.
The PMU of the drone ground remote control unit can supply power to each component, ensure the power supply of each component is normal, and can filter the noise of the out-of-bounds noise to a certain degree, and better guarantee the accuracy of the remote control. At the same time, Make the remote's battery use longer. The PMU power management module unit of the UAV flight controller master unit provides power to the components including the flight controller master controller and the ESC electrical control unit to ensure normal and stable operation of the flight controller unit.
The RICOH Ricoh RC5T620 Series PMU has the following advantages: The PMU mentioned above can easily perform the power management functions of the UAV components.
Figure 1: Appearance of RICOH Ricoh RC5T620 Series PMU
The main features of RICOH Ricoh RC5T620 series PMU:
• Integrated 5-channel high-efficiency step-down DCDC module
• Integrated 12-channel low voltage linear regulator LDO
• USB expansion device interface
• Fuel gauge
• Analog to digital conversion module
• 5-channel universal IO port GPIO
• Real-time clock (RTC)
• Interrupt Control Logic (INTC)
• Lithium battery charging module
• Voltage detection module
• I2C communication bus