Shared Step-Up Power Circuit With Capacitor Backup for Critical Loads
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Solution Overview
Problem
Conventional power source devices face increased circuit size and power supply instability as the number of loads increases, and they often fail to function during instantaneous power interruptions, especially when battery voltage drops.
Innovation Solution
A power source device incorporating a shared step-up circuit, a diode for backflow prevention, and an electrolytic capacitor, which connects multiple loads in parallel and uses the capacitor to supply power during voltage drops and interruptions, preventing backflow to non-essential loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a step-up circuit is arranged for each load, then the input voltage of each load can be maintained constant even during cold cranking, but the circuit size increases as the number of loads increases
Solution Approach 1:
The patent merges multiple step-up circuits into a single shared step-up circuit that serves multiple loads simultaneously. The step-up circuit is configured to output power to both the first load (requiring backup power) and the second load (not requiring backup power) through a common power supply line, thereby reducing the overall circuit size while maintaining voltage stability for all loads during cold cranking conditions
Solution Approach 2:
The patent segments the power supply system into two distinct paths: a backup power supply path including the electrolytic capacitor and diode for the first load, and a non-backup path for the second load. This segmentation allows the system to provide differentiated power protection while using a single shared step-up circuit, resolving the contradiction between circuit size and reliability
2Device complexity
If a conventional step-up circuit is used, then the circuit size is reduced by sharing, but the circuit fails to supply power stably during instantaneous power interruptions
Solution Approach 1:
The electrolytic capacitor is pre-charged during normal operation when power is available, storing energy in advance. During instantaneous power interruptions or voltage drops, this pre-stored energy is immediately discharged to maintain power supply to the first load, ensuring stable operation without requiring multiple separate circuits
Solution Approach 2:
The diode for backflow prevention acts as an intermediary component that isolates the backup power supply path from the non-backup path. It prevents reverse current flow and ensures that the electrolytic capacitor's stored power is directed exclusively to the first load during interruptions, maintaining power supply stability while using a shared step-up circuit
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
This configuration reduces circuit size and ensures stable power supply to critical loads even when battery voltage drops, preventing data loss during interruptions by using the electrolytic capacitor to store and supply power.
Implementation Method 1
an electrolytic capacitor (6) connected between the diode for backflow prevention (7) and the first load (100)... using the electrolytic capacitor to store and supply power
Implementation Method 2
a diode for backflow prevention (7) connected between the step-up circuit (3) and the first load (100)... preventing backflow to non-essential loads
Data Source
AI summary
A power source device includes a step-up circuit, a diode for backflow prevention, and an electrolytic capacitor. The step-up circuit is connected to a power source on an input side thereof and is connected to a first load and a second load in parallel on an output side thereof. The diode for backflow prevention is connected between the step-up circuit and the first load. The electrolytic capacitor is connected between the diode for backflow prevention and the first load.