Wireless Power Switch Circuit for Electronic Key Battery Management
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Solution Overview
Problem
Electronic keys face inefficiencies in starting up their analog front-end circuits using radio waves from vehicles, requiring proximity and leading to inconvenient battery power storage and consumption.
Innovation Solution
An electronic circuit with a switch, power conversion circuit, and control circuit that utilizes weak radio waves to switch between conduction and non-conduction states, allowing for efficient power supply to a load without constant battery engagement.
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 activated wirelessly, but it takes time to store electric power required for starting up the AFE and requires keeping the electronic key close to the vehicle
Solution Approach 1:
The power conversion circuit performs preliminary power conversion and storage using capacitors before the AFE startup is needed. The circuit converts radio waves to DC power and stores it in capacitors in advance, so when startup is required, the power is already available without requiring the key to remain close to the vehicle for an extended period.
Solution Approach 2:
Capacitors are introduced as intermediary energy storage elements between the power conversion circuit and the AFE. These capacitors temporarily hold the converted DC power, acting as a buffer that decouples the timing between power reception and power consumption, allowing the key to be started up without maintaining continuous proximity to the vehicle.
2Duration of action of stationary object
If the connection between batteries and circuits is cut off during standby to minimize battery consumption, then battery lifespan is extended, but the electronic key cannot be activated quickly when needed
Solution Approach 1:
The system performs preliminary power conversion and storage in the capacitors during standby periods when power is available. This way, when the electronic key needs to be activated, the power is already prepared and stored, enabling immediate startup without requiring the battery to remain connected or the key to be close to the vehicle.
Solution Approach 2:
The power conversion circuit and capacitors form a self-sufficient power management subsystem that can independently store and provide power without requiring continuous battery connection. This self-service mechanism allows the system to extend battery lifespan by disconnecting during standby while maintaining the capability for quick activation when needed.
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 and efficient power management by maintaining a conduction state using weak radio waves, reducing battery consumption and eliminating the need for constant proximity to the vehicle for startup, thus enhancing battery lifespan and device usability.
Implementation Method 1
an antenna 140 capable of receiving radio waves
Implementation Method 2
the power conversion circuit 110 may include at least a first capacitor C11 including a first electrode C11a and a second electrode C11b, a first diode D11 having an anode connected to a ground point TG and a cathode connected to the second electrode C11b of the first capacitor C11
Data Source
AI summary
A convenient electronic circuit in which a switch is able to be switched through electric power obtained using weak radio waves is provided. An electronic circuit includes a switch which is connected between a power supply configured to output direct current (DC) electric power and a load driven through DC electric power supplied from the power supply and which switches a connection state between the power supply and the load from a non-conduction state to a conduction state; a power conversion circuit which includes a power input terminal to which electric power obtained through radio waves received by an antenna is input and a DC power output terminal configured to output DC electric power and which converts electric power input to the power input terminal into DC electric power and outputs the converted DC electric power from the DC power output terminal; 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. The power conversion circuit includes at least a first capacitor, a first diode, a second capacitor, and a second diode.