Battery Power Supply Circuit With Interrupt Protection for Low-Voltage Loads
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Solution Overview
Problem
Existing power supply devices risk damaging low-voltage loads when supplying discharged battery power without proper voltage regulation, leading to potential overvoltage issues.
Innovation Solution
A power supply device with a voltage converter, an interrupt circuit, and an electronic control unit that operates the interrupt circuit when the interface connection circuit voltage exceeds the rated voltage of the low-voltage load, preventing overvoltage and including switching elements to manage voltage output effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the discharged power of the battery is supplied to the low-voltage load without being stepped down, then the power supply efficiency is improved, but the low-voltage load may be damaged due to overvoltage
Solution Approach 1:
The interrupt circuit acts as an intermediary between the battery and the low-voltage load. It monitors the voltage level and selectively interrupts the power supply path when overvoltage conditions are detected, preventing damage to the low-voltage load while allowing efficient power transfer under normal conditions.
Solution Approach 2:
The interrupt circuit performs preliminary protection by continuously monitoring the voltage level before it can reach damaging levels for the low-voltage load. The control unit detects voltage conditions in advance and pre-interrupts the circuit to prevent overvoltage damage, rather than reacting after damage occurs.
2Reliability
If a bypass circuit is added to handle overvoltage conditions, then the low-voltage load protection is improved, but the device complexity increases
Solution Approach 1:
The protective function is extracted as a separate, independent interrupt circuit rather than being integrated into the main power conversion circuitry. This modular approach provides effective protection while maintaining clear functional separation and reducing overall system complexity.
Solution Approach 2:
The system changes its operational state based on voltage parameters. The interrupt circuit monitors voltage levels and transitions the system from a conducting state (power flowing) to a non-conducting state (power interrupted) when voltage exceeds safe thresholds, providing dynamic protection without complex circuitry.
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 effectively suppresses damage to low-voltage loads by interrupting the circuit when overvoltage is detected, ensuring safe and efficient power supply to low-voltage loads, and simplifies the device structure by eliminating the need for a bypass circuit.
Implementation Method 1
a voltage converter 40 provided between the battery 50 and the external interface 20
Implementation Method 2
The interrupt circuit 300 is provided in the low-voltage circuit 60 and electrically interrupts the low-voltage circuit 60 and the interface connection circuit 30
Data Source
AI summary
Disclosed herein is a power supply device and a control method for the power supply device. The power supply device includes: a battery; an external interface electrically connected to the battery and electrically attachable to or detachable from an external device; a voltage converter provided between the battery and the external interface; a low-voltage circuit that branches from an interface connection circuit connecting the external interface and the voltage converter and is connected to a low-voltage load having a rated voltage lower than a voltage of the battery; an interrupt circuit provided in the low-voltage circuit and configured to electrically interrupt the low-voltage circuit and the interface connection circuit; and an electronic control unit configured to control operations of the voltage converter and the interrupt circuit. The electronic control unit operates the interrupt circuit when a voltage of the interface connection circuit exceeds the rated voltage of the low-voltage load.