Radio-Wave Powered Battery Switch Circuit for Keyless AFE Startup
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electronic keys used in vehicle key systems face inefficiencies in battery power management, particularly when starting up an analog front-end circuit using weak radio waves, requiring the key to be kept close to the vehicle for power storage, which is inconvenient.
Innovation Solution
An electronic circuit with a switch, power conversion circuit, and control circuit that utilizes weak radio waves to switch between power supply states, allowing the circuit to operate independently of direct proximity to the vehicle, using a power conversion circuit to convert received radio wave energy into DC power and a control circuit to manage the switch's conduction state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the AFE is started up using radio waves from the vehicle, then the electronic key can be operated wirelessly, but it takes time to store electric power required for starting up the AFE and the key must be kept close to the vehicle
Solution Approach 1:
The patent applies preliminary action by storing electric power in a capacitor before it is needed for AFE startup. The power storage circuit accumulates energy from weak radio waves in advance, so when the AFE needs to be activated, the power is already available immediately without requiring the key to be held close to the vehicle for an extended period.
2Adaptability or versatility
If the AFE is started up using radio waves from the vehicle, then wireless communication is enabled, but the key must be kept close to the vehicle until startup is complete
Solution Approach 1:
The power storage circuit performs preliminary energy accumulation from weak radio waves, enabling the AFE to startup immediately when needed without requiring the key to remain in close proximity to the vehicle throughout the entire startup process.
Solution Approach 2:
The capacitor acts as an intermediary energy storage element between the weak radio waves and the AFE circuit. It mediates the energy transfer by accumulating power from the radio waves and then releasing it to the AFE, decoupling the proximity requirement from the communication capability.
3Loss of energy
If a switch cuts off battery connection during standby to reduce consumption, then battery life is extended, but the circuit cannot be activated using weak radio waves
Solution Approach 1:
The power storage circuit performs preliminary energy accumulation from weak radio waves even when the battery is disconnected during standby. This allows the system to gather sufficient energy from radio waves in advance to activate the AFE and control circuit without needing the battery connected, enabling both battery conservation and radio wave activation.
Solution Approach 2:
The power storage circuit enables the system to serve itself by accumulating energy from weak radio waves independently of the battery. The circuit can activate itself using the stored energy from radio waves, eliminating the need for battery connection during the activation process.
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
Enables convenient operation of electronic circuits using weak radio waves, reducing battery consumption and eliminating the need for close proximity to the vehicle for startup, thus enhancing usability and efficiency.
Implementation Method 1
a power conversion circuit (110) that includes a power input terminal to which electric power obtained by radio waves received by an antenna (140) capable of receiving radio waves is input and a DC power output terminal configured to output DC electric power and that converts electric power input to the power input terminal into DC electric power
Data Source
AI summary
A convenient electronic circuit in which a switch is able to be switched through electric power obtained by weak radio waves is provided. An electronic circuit includes: a power supply configured to output direct current (DC) electric power; a switch connected between the power supply and a load driven by DC electric power supplied from the power supply and configured to switch a connection state between the power supply and the load from a non-conduction state to a conduction state; an power input terminal to which electric power obtained by radio waves received by an antenna capable of receiving the radio waves is input; a DC power output terminal configured to output DC electric power, a power conversion circuit configured to convert electric power input to the power input terminal into DC electric power and output the converted electric power from the DC power output terminal; an input terminal connected to the DC power output terminal of the power conversion circuit; an output terminal connected to the switch and configured to control a connection state of the switch; and a control circuit configured to control a connection state of the switch to be in a conduction state when the power conversion circuit outputs DC electric power due to the reception of radio waves by the antenna.