Boost Power Supply Switching for Low-Temperature Battery Operation
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Solution Overview
Problem
In low-temperature scenarios, the internal resistance of batteries increases exponentially, causing a sharp drop in output voltage, leading to abnormal device operation or shutdown, and in low-voltage scenarios, devices may malfunction despite available power, resulting in inefficient battery usage.
Innovation Solution
A circuit with multiple power supply paths and boost circuits is employed, including a first switch, a first boost circuit, and unidirectional conductive switches, to manage power distribution and boost voltage when necessary, ensuring stable operation and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the battery operates in low-temperature scenario, then the battery provides power, but the internal resistance increases exponentially causing output voltage to drop sharply
Solution Approach 1:
The patent uses a boost circuit to change the voltage parameter of the battery output. When the battery voltage drops due to low temperature, the boost circuit increases the voltage to meet the working circuit requirements, resolving the contradiction between low temperature operation and reliable device function
Solution Approach 2:
The boost circuit acts as an intermediary between the battery and the working circuit. It mediates the voltage mismatch caused by low temperature, converting the battery's low output voltage into a suitable voltage level for the working circuit, thereby ensuring reliable operation
2Use of energy by moving object
If the battery output voltage is low but power is available, then the battery can still provide energy, but the voltage is lower than the preset working voltage threshold causing abnormal device operation
Solution Approach 1:
The boost circuit changes the voltage parameter to meet the working threshold. Even when the battery has sufficient power but low voltage, the boost circuit elevates the voltage above the preset working threshold, enabling reliable device operation while utilizing available battery energy
Solution Approach 2:
The system dynamically switches between direct power supply mode and boost conversion mode based on real-time voltage detection. When voltage is sufficient, direct supply is used; when voltage drops below threshold, boost conversion is activated, optimizing both power utilization and operational reliability
3Adaptability or versatility
If a boost circuit is added to increase voltage, then the device can operate in low-voltage scenarios, but the device complexity increases
Solution Approach 1:
The patent implements a dynamic control system that automatically detects battery voltage and switches between direct power supply and boost conversion modes. This dynamic approach allows the system to adapt to different voltage conditions without requiring the boost circuit to be always active, thereby managing complexity while expanding adaptability
Solution Approach 2:
The control function is extracted into a separate processing circuit that monitors voltage levels and controls the switch states. This separation allows the boost circuit to be integrated only when needed, reducing overall system complexity while maintaining expanded operating range
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 maintains device functionality by boosting voltage when needed, prevents excessive current, and prolongs battery life by optimizing power consumption and reducing power loss.
Implementation Method 1
the first boost circuit 131 may perform boost conversion based on the voltage of the battery
Implementation Method 2
the first unidirectional conductive switch 1301, the first boost circuit 131 is electrically connected in series between the battery 110 and the first unidirectional conductive switch 1301, the first unidirectional conductive switch 1301 is electrically connected in series between the first boost circuit 131 and the first working circuit, and a conduction direction of the first unidirectional conductive switch 1301 is a direction from the first boost circuit 131 to the first working circuit
Data Source
AI summary
An electronic device includes at least a battery, a working circuit, and a boost circuit. When the battery supplies power to the working circuit, the boost circuit supplies power to the working circuit in response to that the electronic device meets a low-temperature or low-voltage condition. In a power supply path switching process, the boost circuit first supplies power to the working circuit through a diode, and then disconnects a path for supplying power to the working circuit by the battery. Before the path for supplying power to the working circuit by the battery is disconnected, a voltage for supplying power to the working circuit by the boost circuit through the diode is controlled not to be higher than a voltage for supplying power to the working circuit by the battery.