Power Supply Device Using DC-DC Converter and H-Bridge Circuit
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Solution Overview
Problem
Conventional power supply systems using a battery and capacitor in parallel cannot drive an inverter if the capacitor's voltage drops below the minimum operating voltage, as the capacitor's voltage linearly decreases during discharge, rendering the remaining electrical energy unusable.
Innovation Solution
A power supply device incorporating a secondary battery and capacitor connected in parallel, utilizing an insulation type DC-DC converter and an H-bridge circuit to selectively connect the capacitor in series, applying bias voltages in forward and reverse directions to maintain an effective voltage range for the inverter, allowing the system to utilize remaining energy even when the capacitor's voltage drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a capacitor is used in parallel with a secondary battery to supply power to a load, then the power supply capability is improved, but the voltage drops linearly during discharge causing the inverter to become inoperable before the capacitor is fully depleted
Solution Approach 1:
The patent applies dynamics by making the connection configuration between the capacitor and inverter changeable. The switching circuit dynamically reconfigures the circuit topology based on the capacitor's voltage state. When voltage is sufficient, the capacitor connects in parallel to provide high power. When voltage drops below the threshold, the switching circuit reconfigures to connect the capacitor in series with the battery, maintaining operational voltage and allowing continued energy utilization.
Solution Approach 2:
The patent changes the electrical connection parameters (series/parallel configuration) based on the capacitor's voltage parameter. By monitoring the voltage and switching between different connection modes, the system adapts the electrical parameters to maintain operability throughout the discharge process, transforming the fixed parameter system into a variable parameter system that optimizes energy utilization.
2Reliability
If the capacitor voltage drops below the minimum operating voltage, then the inverter cannot be driven, but the capacitor still contains remaining electrical energy that cannot be utilized
Solution Approach 1:
The switching circuit provides dynamic reconfiguration capability, transitioning the system from a static parallel connection to a dynamic system that can adapt its topology. When the capacitor voltage drops below the minimum operating threshold, the switching circuit activates to change the connection mode, ensuring the inverter continues to receive sufficient voltage while the capacitor still contains可利用 energy.
Solution Approach 2:
The switching circuit acts as an intermediary element that mediates between the capacitor and the inverter. It controls the connection state based on voltage conditions, enabling the system to bypass the voltage threshold limitation by introducing this control intermediary that can reconfigure the electrical topology to maintain operability.
3Loss of energy
If a larger capacitor is used to extend the usable voltage range, then the energy utilization is improved, but the size and weight of the capacitor increase
Solution Approach 1:
Instead of using a larger capacitor to extend voltage range, the patent uses dynamic reconfiguration of the existing capacitor. By switching between parallel and series connection modes, the system effectively extends the usable voltage range without increasing capacitor size, achieving the goal of extended energy utilization with the same physical component.
Solution Approach 2:
The patent changes the electrical connection parameters (series/parallel configuration) to effectively extend the voltage range. This parameter change approach allows the same capacitor to provide extended usable voltage range by altering its connection mode rather than increasing its physical capacity, thereby avoiding increased weight.
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 the effective utilization of electrical energy from the capacitor by maintaining an apparent voltage above the minimum operating voltage, extending the usable voltage range, and reducing the size and weight of the capacitor required.
Implementation Method 1
a primary coil and a secondary coil, the primary coil being connected in parallel to the secondary battery, the primary coil being configured to accumulate energy by a current supplied from the secondary battery
Implementation Method 2
the secondary coil being configured such that an induction current flows thereinto from the primary coil by the accumulated energy
Data Source
AI summary
A power supply device supplies power to a load by combining a secondary battery and a capacitor connected in parallel to the secondary battery. The power supply device includes an insulation type DC-DC converter with a primary coil connected in parallel to the secondary battery and configured to accumulate energy by a current supplied from the secondary battery and a secondary coil configured such that an induction current flows thereinto from the primary coil by the accumulated energy, and a switching circuit configured to selectively connect the secondary coil in series to the capacitor in forward and opposite directions.