Electronic Control Device Standby Power Circuit
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Solution Overview
Problem
Existing electronic control devices for vehicles face increased power consumption due to the need for additional power circuits to supply standby power voltages to internal circuits, especially with advanced semiconductor technology leading to lower operating power voltages.
Innovation Solution
An electronic control device with an internal power circuit that generates a third power voltage by lowering a first power voltage from an external source, allowing a timer to measure soak time even when the power switch is off, and a data memory circuit to store this data, thereby reducing power consumption by stopping unnecessary operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a power circuit is added to supply standby power voltage to internal circuits, then the timer can operate during standby state to measure soak time, but power consumption increases
Solution Approach 1:
The internal power circuit operates periodically rather than continuously. The control circuit activates the internal power circuit only when the timer needs to save measured time data to the data memory circuit, and deactivates it otherwise. This periodic operation enables the timer to maintain measurement capability while significantly reducing overall power consumption compared to continuous operation.
Solution Approach 2:
The system uses the always-supplied first power voltage to enable the data memory circuit to save timer data without requiring continuous operation of the power reduction mechanism. The timer autonomously continues measuring soak time using the third power voltage from the internal power circuit, while the control circuit intelligently manages when to activate the power circuit based on data saving needs.
2Use of energy by moving object
If the internal power circuit is stopped to reduce power consumption, then power savings are achieved, but the timer cannot measure soak time
Solution Approach 1:
The data memory circuit is designed to save measured time data from the timer before the internal power circuit is stopped. The control circuit monitors the timer operation and activates the internal power circuit in advance to allow data saving, ensuring measurement continuity without requiring the power circuit to remain active throughout the entire measurement period.
3Adaptability or versatility
If advanced semiconductor process micronization is used to lower operating power voltage, then device integration is improved, but additional power circuits are needed increasing complexity
Solution Approach 1:
The first power voltage supply line serves multiple functions: it powers the data memory circuit directly, provides backup power capability, and enables the control circuit to manage power distribution. This multi-functional use of the always-supplied first power voltage eliminates the need for separate dedicated power supply circuits for standby components, reducing overall system complexity while supporting advanced semiconductor processes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces power consumption by enabling the timer to measure soak time without continuous operation of the internal power circuit, maintaining measured data for when the power is restored, and allowing for efficient engine control operations.
Implementation Method 1
generates a third power voltage by lowering the first power voltage
Data Source
AI summary
An internal power circuit lowers a battery voltage supplied always from an external side to generate a standby power voltage. A timer continues to measure an elapse of time in a standby state, after a main relay is turned off and supply of a power voltage is interrupted. A measured time data of the timer is saved to a save register during a time measurement operation of the timer. When a stop condition for stopping the time measurement operation of the timer is satisfied, a control circuit stops the operation of the internal power circuit. When the main relay is turned on, the internal power circuit is activated to start its operation again by the control circuit so that the measured time data saved to the save register is restored to the timer.