General Overview

With the progress of technology, unmanned aerial vehicle (UAV) technology has emerged as a key force driving industry transformation, deeply integrated into numerous fields. Originating from military applications, UAVs have gradually expanded to diverse civilian scenarios, leaving a clear and far-reaching development footprint. A UAV is an aircraft that can fly autonomously through an automatic control system or be remotely piloted without a human operator on board. Comprising systems such as the airframe, power, and flight control, it can carry equipment to perform various tasks, including aerial photography, monitoring, and reconnaissance. Civilian UAVs are widely used in aerial photography, agriculture, logistics, and other fields, while military UAVs play important roles in tasks such as reconnaissance, attack, and tactical support.

 

1. Urgent Need to Overcome Technical Bottlenecks

Limited endurance remains the primary technical challenge restricting the development of UAVs. Despite the rapid advancement of energy technology, due to key factors such as battery energy density and aircraft power consumption, most UAVs still struggle to meet the demands of long-distance and long-duration missions. In large-scale mapping, inspection, or long-distance logistics transportation tasks, UAVs often need to be charged frequently or have their batteries replaced. This not only increases the complexity and cost of operation but also may affect the continuity and timeliness of the mission.

Insufficient anti-interference capabilities seriously impact the flight stability and reliability of UAVs. In complex electromagnetic environments, such as urban dense areas, electronic warfare battlefields, or near strong radio frequency signal sources, the navigation, communication, and control systems of UAVs are highly susceptible to external interference. This can lead to a series of problems, such as loss of flight attitude control, signal loss, or data transmission errors. This not only poses a serious threat to the safe flight of UAVs but also may cause mission failure and irreparable losses.

In complex scenarios, the autonomous decision-making ability and intelligent obstacle avoidance level of UAVs still have significant room for improvement. Although existing intelligent algorithms and sensor technologies can handle some common environmental situations, when faced with complex scenarios such as extreme weather, complex terrains, and dynamically changing obstacles, the intelligent systems of UAVs often fall short. Therefore, it is essential to significantly enhance their decision-making speed and accuracy to ensure that UAVs can still fly safely and execute tasks efficiently in complex and changeable environments.

2. Corebai Solution

In response to the technical bottlenecks of UAVs, Corebai, through in-depth research and leveraging its professional technical R & D capabilities, has introduced a targeted product solution, providing strong support for the stable operation and performance improvement of UAVs.

l Reset (Monitoring Circuit): Monitors power supply, system status, and data communication to ensure the stable operation of UAVs. It can issue timely alerts or take measures in case of abnormalities.

l OPA (Amplifier): Amplifies sensor signals, radio frequency communication signals, audio and video signals to meet the requirements of processing, communication, and display.

l LDO (Low Dropout Linear Regulator): Stabilizes voltage, filters power supply noise, and adapts to different power sources, providing a stable and pure power supply for sensitive components.

The application block diagram of UAVs is as follows:

Reset: CBM809 Monitoring Circuit Product

l Significant Low Power Consumption Advantage: The operating current is as low as 17µA, greatly reducing system power consumption, making it an ideal choice for low-power portable devices.

l Precise Voltage Monitoring: Offers various precise voltage monitoring options, such as 2.5V, 3V, 3.3V, 5V, etc., to meet the power supply voltage monitoring requirements of different systems. The reset comparator has a built-in anti-surge feature, which is not affected by the rapid transients of VCC, ensuring timely reset operations when the power supply voltage drops to a safe range.

l Reliable Reset Function: The reset set is as low as 1V VCC. Even when the power supply voltage is very low, it can ensure the effective output of the reset signal. The minimum power-on reset pulse is 140ms, keeping the microprocessor in a reset state before the power supply reaches a stable state, avoiding system failures caused by unstable power supplies. It provides a low-level active reset signal /RESET and is equipped with a push-pull output stage, significantly enhancing the driving capability to ensure that the reset signal is accurately transmitted to the monitored device.

l Wide Operating Temperature Range: It can operate normally within the temperature range of - 40°C to + 125°C, adapting to various harsh working environments.

l Compact Packaging: Adopts 3-pin SOT-23 and SC70 packaging, with a small volume and occupying less PCB space, facilitating use in compact circuit board designs.

 

LDO: CBM1117

l High Output Current: It can provide an output current of up to 0.8A, meeting the power supply requirements of complex functional modules that require a large current and having a strong load driving capacity.

l Wide Input Voltage Range: Supports a wide input voltage range from 2.6V to 15V, being compatible with various power supply conditions. Whether it is a battery-powered device or other power supply devices, it can exhibit good compatibility.

l Multiple Output Voltage Options: There are two types of output voltages: fixed and adjustable. Fixed output voltages include common values such as 1.5V, 1.8V, 2.5V, 3.3V, and 5.0V. The adjustable output voltage range is 1.2V - 13.8V, meeting the different voltage requirements of various devices.

l Thermal Overload Protection and Current Limiting: When the chip temperature reaches approximately 150°C, the thermal shutdown circuit will disable the output to prevent the device from being damaged by overheating. The built-in current limiting circuit limits the current when the output or adjustment terminal is short-circuited, protecting the safety of the device.

 

OPA: CBM27 Precision Operational Amplifier

l Low Noise: At 10Hz, en = 3.5nV/√Hz, and the low 1/f noise corner frequency is 2.7Hz. When processing low-level signals, it can effectively reduce noise interference, enhancing the purity and accuracy of the signal. It is especially suitable for scenarios with extremely strict noise requirements, such as professional audio circuits and precision measuring instruments.

l High-Precision Amplification Performance: The open-loop gain is as high as 1800V/mV, which can amplify weak signals significantly and accurately while maintaining signal integrity. This helps achieve accurate signal amplification and processing in various circuits that require high-precision signal processing.

l Wide Voltage Supply Range: Supports a wide voltage supply range from ±4V to ±18V and can also operate with a single power supply from 8V to 36V. It can adapt to various power supply conditions, providing greater flexibility in circuit design and facilitating use in devices with different power supply environments.

l High-Speed Performance: With a gain-bandwidth product of 8MHz and a slew rate of 2.8V/μs, it can achieve excellent dynamic accuracy in high-speed data acquisition systems, quickly tracking and processing changing signals. It is suitable for applications that require high signal processing speed.

l Low Input Offset Voltage: The offset voltage is as low as 26μV, with a temperature drift of 0.2μV/°C. Even in a changing temperature environment, it can maintain stable performance, ensuring the accuracy and stability of the amplified signal. It is very suitable for precision instruments and other applications that require long-term stable operation.

l Good Load Driving Capability: The output stage has good load driving capability, with a ±10V guaranteed swing (600Ω load) and low output distortion. It can provide a stable signal drive for subsequent loads and can directly drive some loads that require a large driving capability, such as speakers, performing excellently in professional audio applications.

l High Power Supply Rejection Ratio and Common-Mode Rejection Ratio: Both the power supply rejection ratio (PSRR) and the common-mode rejection ratio (CMRR) exceed 120dB, effectively suppressing power supply voltage fluctuations and common-mode signal interference, improving the anti-interference ability and stability of the circuit.

 

OPA: CBM8539 Precision Operational Amplifier

· Low Offset Voltage: Using automatic zero adjustment technology, it can provide an extremely low offset voltage, with a maximum of 5μV and close to zero drift when used under over-temperature and over-time conditions. This ensures the accuracy of signal amplification and reduces errors caused by offset voltage.

· Wide Input and Output Range: It has a high-offset input impedance, rail-to-rail input, and rail-to-rail output swing, capable of processing signals close to the power supply rails. It can effectively increase the signal dynamic range and processing capability, adapting to the input and output of various signal amplitudes.

· Good Power Supply Adaptability: It can operate with a single power supply ranging from a minimum of + 2.7V (±1.35V) to a maximum of + 5.5V (±2.5V) or a dual power supply within the same range, providing a relatively wide power supply range. It can adapt to different power supply conditions, offering greater flexibility in circuit design.

· Low Noise: As a miniature, high-precision operational amplifier, it has ultra-low noise, effectively reducing noise interference in signals and improving signal quality. It is suitable for applications with strict noise requirements.

 

3. Application Scenarios

In the complex system architecture of UAVs, the Corebai solution is like a precision gear set. Although each component has its own division of labor, they are closely interlocked, working together to drive the efficient operation of UAVs in various fields and becoming an essential core of the system.

 

Aerial Photography and Film Production

At film shooting sites, aerial photography UAVs equipped with Corebai products can navigate through complex shooting environments with stable performance. The CBM809 monitoring circuit ensures the stable operation of the UAV system and extends the shooting endurance time, giving photographers ample opportunities to capture the magnificent scenery at sunrise and sunset, the dazzling city night lights, or the unique features of natural landscapes. This meets the demand for high-quality aerial shots in movies, advertisements, documentaries, etc., bringing a stunning visual experience to the audience.

 

Environmental Monitoring

In urban environmental monitoring projects, environmental monitoring UAVs carry various professional sensors. Leveraging the low-noise and high-precision signal processing capabilities of the CBM27 precision operational amplifier, they can accurately detect atmospheric pollutants, water quality pH, soil pollution indicators, etc. Whether in the central areas of bustling cities or near industrial pollution sources, UAVs can quickly collect data and transmit it to environmental protection departments, promptly identifying environmental problems and providing a scientific basis for environmental governance and ecological protection, safeguarding the human living environment.

 

Traffic Management

In urban traffic networks, traffic flow monitoring UAVs utilize the high-speed signal processing capabilities of the CBM27 to track the speed, flow, and congestion of vehicles on the road in real-time. By promptly feeding back the collected data to traffic management departments, they provide data support for intelligent transportation systems, assisting in optimizing the timing of traffic lights and planning traffic diversion schemes. This helps alleviate urban traffic congestion, improve traffic operation efficiency, and ensure the smooth flow of urban roads.

 

Polar and Special Environment Scientific Research

In extremely harsh scientific research environments such as polar glaciers, desert interiors, and mountain peaks, UAVs can achieve long-term and stable operation due to the excellent wide temperature adaptability and low power consumption advantages of the CBM809. The scientific detection equipment carried on the UAVs, with the support of Corebai products, continuously monitors and collects data on glacier changes, ecosystems, weather conditions, etc., providing precious first-hand information for scientific research and facilitating human exploration and understanding of extreme environments.