Resistor-Multiplexed Wake-Up Circuit for Zero-Standby Input Sensing
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Solution Overview
Problem
Existing circuits for activating electronic devices in vehicles face inefficiencies in power management during standby modes, leading to power drainage and requiring multiple wires for user input interfaces.
Innovation Solution
A sensing circuit with a first transistor and multiple switches connected to identifying resistors, which outputs characteristic voltages to activate a microcontroller efficiently, using a single wire interface and maintaining zero standby current, allowing for efficient user input detection and control signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing circuits are used to activate electronic devices, then user input detection is enabled, but power drainage occurs during standby modes
Solution Approach 1:
The patent extracts the activation function from the main controller, implementing it in a separate sensing circuit that operates independently during standby. This sensing circuit can detect user inputs and generate activation signals without requiring the main controller to be powered, thereby eliminating power drainage during standby while maintaining reliable user input detection.
Solution Approach 2:
The patent introduces a sensing circuit as an intermediary between the user input interface and the main controller. This intermediary circuit handles signal detection and controller activation without requiring continuous power to the main controller, thus preventing power drainage while ensuring reliable input detection through the sensing circuit's dedicated detection capability.
2Ease of operation
If existing circuits are used for user input interfaces, then multiple wires are required for connection, but circuit complexity increases
Solution Approach 1:
The patent implements a single wire that serves multiple functions: it carries both the user input signal from the interface and the activation signal to the main controller. The sensing circuit processes the input signal and generates the activation signal on the same wire, eliminating the need for separate wires and reducing overall system complexity while maintaining ease of operation.
Solution Approach 2:
The patent merges the input signal transmission function and the activation signal transmission function into a single wire connection. The sensing circuit combines these functions by detecting the input signal and generating the activation signal that is transmitted back through the same wire, thereby reducing the number of wires required and simplifying the user interface connectivity.
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 circuit effectively activates a microcontroller to sense user inputs while preventing power usage during standby, reducing power drainage and simplifying the user interface with a single wire connection, enabling efficient control of electronic devices like wireless transmitters.
Implementation Method 1
a first transistor configured to output an activation signal to the controller and a plurality of switches in connection with a base of the transistor
Implementation Method 2
The first output node and the second output node are configured to output a characteristic voltage corresponding a ratio of each of the identifying resistors
Data Source
Figure 1
AI summary
A sensing circuit configured to activate a controller is disclosed. The circuit comprises a first transistor configured to output an activation signal to the controller and a plurality of switches in connection with a base of the transistor. Each of the switches is connected to an identifying resistor. A first output node and a second output node are in communication with the base of the transistor and each of the switches. The first output node and the second output node are separated across an additional identifying resistor. The first output node and the second output node are configured to output a characteristic voltage corresponding a ratio of each of the identifying resistors in response to an input received by one or more of the plurality of switches.