““Behind a major safety accident, there have been 29 minor failures, and there have been about 300 signs of accidents or hidden dangers.” Any accident has a reason and a symptom. If it is detected and controlled in time, the safety accident can be controlled and avoided – Hein’s Law. Therefore, there are traces behind every security incident.

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“Behind a major safety accident, there have been 29 minor failures, and there have been about 300 signs of accidents or hidden dangers.” Any accident has a reason and a symptom. If it is detected and controlled in time, the safety accident can be controlled and avoided – Hein’s Law. Therefore, there are traces behind every security incident.

ZG’s PDU power distribution solution provides protection for early detection of hidden dangers. With the development of the automotive industry, the complexity of automotive Electronic systems is getting higher and higher, and the energy consumption management of system power, node power failure management, and load diagnosis information management have become more and more important. The traditional automobile power distribution unit has the disadvantages of low integration and large volume, which can no longer meet the needs of increasingly complex automobile systems. ZG has launched a PDU power distribution control solution based on market demand, which realizes 12V/24V power output distribution management, replaces traditional fuses and relays, realizes efficient management of power consumption, load status diagnosis, timely fault trigger protection, and reports fault information. and other functions.

PDU (Power Distribution Unit), that is, the power distribution unit. The solution uses a high-side intelligent switch (eSwitch) as the control execution part, which is suitable for 12V (commonly used vehicles) and 24V (trucks, buses) vehicle systems, and performs power distribution management for different nodes and different types of loads on the vehicle, as shown in the figure. 1 shown.

Figure 1 Body structure and body distribution diagram

Solution overview

The PDU solution is based on the functional safety SBC as the low-voltage power supply, the general-purpose MCU is the main control, and the configurable intelligent switch is the executive part of the power management. 1. Different types of high-side smart switches can be allocated according to the requirements of the type of load, the magnitude of the current, and the response state under load faults; 2. There are three working modes of sleep, normal, and failsafe, which can respectively meet the low power consumption of the system. requirements, normal working requirements and functional safety requirements; 3. Configurable voltage and temperature detection to improve system security; 4. Configurable overcurrent thresholds, millisecond response protection time, error reporting and fault diagnosis feedback mechanism, making the system more compliant Functional safety requirements.

Solution Features

Cost and quality: few peripheral devices and high solution integration;

Diversity: Applicable to a variety of platforms, corresponding to many types of loads;

Security level: with overall system protection features, such as error reporting, power reverse connection protection, output current and chip temperature detection, etc.;

Reliability: good heat dissipation, low loss;

Watchdog and safe fail mode;

Programmable parameter settings;

target application

DC motors, solenoid coils, resistive and inductive loads, low voltage lighting, etc.

Figure 2 Scheme demo object