Sleep-Wake Control Circuit Using D-Type Flip-Flop and Schmitt Triggers
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Solution Overview
Problem
Existing sleep-wake control circuits for electronic control units (ECUs) in electric vehicles face challenges in minimizing quiescent current consumption, ensuring rapid and reliable wake mode transitions, and managing multiple signal sources, which can lead to increased battery degradation and power dissipation.
Innovation Solution
A sleep-wake control circuit utilizing a D-type flip-flop with Schmitt triggers to detect pulse wake-up signals, featuring separate channels for sleep and wake commands, with priority given to wake event signals, and incorporating Schmitt triggers to filter noise, ensuring efficient mode switching and low current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If discrete transistors and FETs are used to manage sleep and wake modes, then the device can switch between modes, but parasitic parameters interfere with signal edge detection and result in additional power dissipation, reducing response speed and reliability
Solution Approach 1:
The patent combines multiple functions into integrated circuits rather than using discrete transistors and FETs. The sleep-wake control circuit integrates signal detection, edge detection, and mode switching functions into a unified circuit block, eliminating the parasitic parameters associated with discrete components and reducing power dissipation while improving response reliability.
Solution Approach 2:
The patent introduces a dedicated sleep-wake control circuit as an intermediary component that sits between the input signals and the ECU. This control circuit handles all the complex signal processing, edge detection, and mode switching operations, isolating the main ECU from these functions and allowing the ECU to operate more efficiently with reduced power dissipation.
2Use of energy by moving object
If the device remains in sleep mode to reduce power consumption, then battery life is extended, but the device must draw quiescent current to maintain functionality and detect wake commands
Solution Approach 1:
The patent applies different quality requirements to different parts of the system. The sleep-wake control circuit maintains higher functionality with lower power consumption to reliably detect wake commands, while the main ECU operates in a true low-power state. This localized differentiation allows the system to detect wake commands reliably without requiring the entire system to consume high power continuously.
Solution Approach 2:
The sleep-wake control circuit is designed to autonomously detect wake commands and manage mode transitions without requiring the main ECU to remain active. The circuit monitors input signals continuously in a low-power state and automatically triggers wake mode when appropriate, allowing the ECU to remain in deep sleep with minimal quiescent current while maintaining reliable wake command detection.
3Adaptability or versatility
If multiple signal sources are used for sleep and wake commands, then the device can respond to various conditions, but managing and scheduling these signals becomes complex
Solution Approach 1:
The sleep-wake control circuit is designed as a universal interface that can handle multiple types of input signals from various sources. It provides standardized processing for different signal types including wake commands, sleep commands, and priority signals, regardless of their origin. This multi-functional design allows the circuit to manage diverse signal sources without increasing overall system complexity.
Solution Approach 2:
The control circuit acts as an intermediary layer between multiple signal sources and the ECU. It consolidates and manages all input signals through a unified interface, handling the complexity of signal scheduling and priority management internally. This intermediary approach allows multiple signal sources to coexist without requiring complex management logic in the main ECU, maintaining adaptability while controlling complexity.
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 enables fast and reliable operation of the ECU while minimizing quiescent current consumption, improving response times to wake commands, and effectively managing multiple signal sources, thereby reducing battery degradation and power dissipation.
Implementation Method 1
A sleep-wake control circuit utilizing a D-type flip-flop with Schmitt triggers to detect pulse wake-up signals
Data Source
AI summary
A sleep-wake control circuit using a D-type flip-flop with a Schmitt trigger to detect pulse wake-up signal transitions. The sleep-wake control circuit comprises a sleep command input channel, a wake command input channel, and a D-type flip-flop. The D-type flip-flop is configured to receive a signal to switch to sleep mode from the sleep command input channel as a clock signal and to receive a wake event signal to switch to wake mode from the wake command input channel as a clear signal, such that a wake event signal from the wake command input channel takes priority over a sleep event signal from the sleep command input channel. The sleep command input channel and the wake command input channel are configured to include Schmitt triggers so as to detect pulse input signals.