Vehicle Power IC Startup Logic for Continuous Power-Up Reliability
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Solution Overview
Problem
The non-permanent battery method for power-up operations in vehicle power management ICs often fails during continuous power-up operations due to incorrect voltage determination at the power input node, leading to failed power-up scenarios.
Innovation Solution
A power apparatus for vehicles that includes a regulator, a switch driving circuit, a main logic circuit, and a register unit to determine the power-up method based on initial input voltage and store this information for subsequent operations, ensuring consistent power-up without failure by maintaining the switch state according to the stored method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the non-permanent battery method is used for power-up operations, then the IC chip can be powered up when battery voltage is cut off, but power-up may fail during continuous power-up operations due to incorrect voltage determination at the power input node
Solution Approach 1:
The power management IC performs preliminary determination of the power-up method during the initial power-up operation by detecting the voltage level at the power input node. This determination result is stored and used to guide subsequent power-up operations, preventing the reliability issue where the IC incorrectly identifies the power-up method during continuous operations. The preliminary action establishes a correct reference state before subsequent operations occur.
2Adaptability or versatility
If the IC chip determines power-up method based on real-time voltage at power input node, then the power-up method can adapt to current voltage conditions, but power-up fails when voltage exceeds threshold during secondary power-up operations
Solution Approach 1:
The system performs voltage detection and power-up method determination as a preliminary action during the first power-up operation. The determined method is then stored and referenced for subsequent operations, rather than re-determining based on real-time voltage. This prevents the adaptability issue where real-time voltage fluctuations cause incorrect power-up method selection during secondary operations.
Solution Approach 2:
The power management IC creates a copy of the power-up method determination result from the initial operation and uses this copied information for subsequent power-up operations. Instead of re-detecting voltage conditions, the system references the stored determination result, ensuring consistent and reliable power-up method selection across multiple operations.
3Ease of operation
If the main relay is opened to cut off battery voltage, then power-down can be achieved, but voltage at power input node remains high causing incorrect power-up method identification
Solution Approach 1:
The power management IC performs voltage detection and power-up method determination as a preliminary action before the main relay is opened. This ensures the voltage level is accurately captured while the battery is still connected, avoiding the measurement precision issue where voltage detection occurs after relay opening when the voltage state may already be altered.
Data Source
AI summary
A power apparatus for a vehicle manages power for a vehicle by performing a power-up operation according to a power-up method determined on the basis of a voltage formed at a power input node connected to a battery of the vehicle when a power-up signal is applied. The power apparatus including a regulator configured to regulate a battery voltage inputted through the power input node; a switch driving circuit configured to turn on/off a switch that controls a connection between the battery and the regulator through the power input node; and a main logic circuit configured to receive control authority for the switch driving circuit from the power apparatus when receiving the power-up signal and the operating voltage generated by the regulator, and to control an on/off operation of the switch.