Rear Lamp Power Switching for Ultra-Low Standby Consumption
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Solution Overview
Problem
Existing vehicle rear lamp systems consume excessive electrical energy due to the continuous power supply to the logic branch of the hybrid integrated circuit, despite the power branch being switched off, which is not sufficient to meet current low power consumption requirements.
Innovation Solution
An external circuit comprising a switch and a switch control unit is connected between the power supply and the rear lamp control unit, allowing complete disconnection of both the logic and power branches, reducing power consumption by integrating a microprocessor with a memory to manage switch operations based on data bus requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the power branch is switched off to reduce power consumption, then the power consumption is reduced, but the logic branch continues to consume power which prevents achieving sufficiently low power consumption levels
Solution Approach 1:
The power supply system is segmented into two independent branches: a power branch for LED driving and a logic branch for control functions. Each branch can be independently switched on or off, allowing the logic branch to be powered down separately from the power branch, thereby achieving ultra-low power consumption states while maintaining functional independence
Solution Approach 2:
A hybrid integrated circuit serves as an intermediary between the power supply and the load, providing intelligent power management. It receives control signals via data bus and autonomously manages the switching of power branches and logic branches, enabling remote power control without requiring direct intervention in the power supply circuit
2Reliability
If the logic branch remains powered to maintain control functionality, then the control functions are available, but the overall power consumption remains too high for modern environmental requirements
Solution Approach 1:
The system operates in periodic cycles, alternating between active states (both branches powered) and sleep states (only power branch powered or completely off). The control unit can wake up from sleep mode to process control functions and then return to sleep, achieving periodic operation that balances functionality with ultra-low power consumption requirements
Solution Approach 2:
The logic branch power supply is extracted and separated from the main power supply chain. By using the hybrid integrated circuit to independently control the logic branch power, the system can completely disconnect the logic branch from power during sleep modes, removing the continuous power consumption burden while maintaining the ability to restore functionality when needed
3Use of energy by moving object
If an external switch control circuit is added to completely disconnect power, then power consumption is significantly reduced, but the system complexity and production cost increase
Solution Approach 1:
The hybrid integrated circuit is designed with multi-functionality, serving both as a power management controller and as a communication interface with the data bus. This single component handles multiple tasks (power switching, signal reception, control logic), eliminating the need for separate dedicated switch control circuits and reducing overall system complexity and production costs
Solution Approach 2:
The switch control unit is merged with the hybrid integrated circuit, combining the power switching control functions directly into the existing control architecture. This integration eliminates separate external switch control circuits, reducing component count, simplifying manufacturing, and lowering production costs while achieving complete power disconnection capability
Data Source
AI summary
A system and method are provided for reducing a power consumption of a vehicle rear lamp. A vehicle data bus, a power supply, at least one light source, and at least one rear lamp control unit are provided. The at least one rear lamp control unit is connected to the light source, and is adapted to power the light source. The rear lamp control unit is connected to the vehicle data bus and the power supply. A switch and a switch control unit are also provided, with the switch control unit being connected to the switch and adapted to close the switch and to open the switch. The switch is connected between the power supply and the rear lamp control unit. The switch control unit is connected to the vehicle data bus.