The drone, the abbreviation for drone, is abbreviated as "UAV", which is (Unmanned Aerial Vehicle). It is a non-manned aircraft operated by radio remote control equipment and its own program control device. From the technical point of view, it can be divided into: unmanned helicopters, unmanned fixed-wing aircraft, unmanned multi-rotor aircraft, unmanned airships, unmanned paraplanes, and so on. According to the application field, it can be divided into military and civilian. In military terms, drones are divided into reconnaissance planes and drones. Civilian applications are mainly used in aerial photography, agricultural plant protection, surveying and mapping, etc. UAV + industry applications are the real needs of drones, greatly expanding the use of drones themselves.
Drone power management
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. An excellent power management system can extend battery life by a factor of two or three by reducing the energy consumption of components when they are idle. Power management technology is also called power control technology.
The main power management devices on the market today mainly include discrete power management chip PMICs and integrated power management unit PMUs. Power Management Integrated Circuits are chips that take responsibility for the conversion, distribution, detection, and other power management of electrical energy in electronic equipment systems. It is mainly responsible for identifying the CPU power supply amplitude, generating a corresponding short-moment wave, and pushing the power circuit of the latter stage circuit. Power management ICs are available in both in-line and surface mount packages. The application scope of the power management chip is very wide. The development of the power management chip is of great significance for improving the performance of the whole machine. The selection of the power management chip is directly related to the system requirements.
Power management is a wide range of applications, including separate power conversion (mainly DC to DC, DC/DC), separate power distribution and detection, and a combination of 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 driving chip, an LED driving chip, a voltage detecting chip, a battery charging management chip, and the like. If the designed circuit requires high noise and ripple rejection of the power supply, it requires a small PCB area (such as a handheld electronic product such as a mobile phone), the circuit power supply does not allow the use of an inductor (such as a mobile phone), and the power supply needs to have instantaneous calibration and output. State self-test function, which requires voltage drop of regulator and low power consumption, low line cost and simple scheme, then 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. Power Management Unit is a highly integrated power management solution for portable applications that integrates traditional discrete power management chips into a single package for higher power. Conversion efficiency and lower power consumption, and fewer component counts to accommodate shrinking board space.
The role of PMU in drone power management:
The most important role of PMU in the UAV products is the following.
1. Provide stable and reliable power supply to the various components of the drone.
2. PMU helps to reduce the power consumption of the entire system, and by reducing the energy consumption of components when idle, the drone battery can have a longer use time.
3. PMU has better signal-to-noise rejection ratio and transient response, which can better prevent the drone from being affected by the external environment and rapid transient response.
4. The integrated features of PMU can save internal structure space, help to miniaturize products, and have better cost advantages and uniform and orderly power supply system.
The PMU of the UAV ground remote control unit can supply power to each component to ensure the normal power supply of each component, and can filter the noise of the boundary noise to a certain extent, better guarantee the accuracy of the remote control, and at the same time, Make the battery of the remote control use for a longer period of time. The PMU power management module unit of the UAV flight control main controller unit supplies power to various components including the flight control main controller and the ESC ESC unit to ensure the normal and stable operation of the flight control unit.
The RICOH Ricoh RC5T620 series PMU from Shiqiang has the following advantages, which can easily complete the power management functions of the PMU mentioned above in the components of the UAV.
Figure 1: RICOH Ricoh RC5T620 Series PMU Appearance
The main features of RICOH Ricoh RC5T620 series PMU:
• Integrated 5 high-efficiency step-down DCDC modules
• Integrated 12 low voltage line regulator LDO
• USB expansion device interface
• Fuel gauge
• Analog to Digital Converter Module
• 5-channel general purpose IO port GPIO
• Real Time Clock (RTC)
• Interrupt Control Logic (INTC)
• Lithium battery charging module
• Voltage detection pass block
• I2C communication bus
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