Power Supply Device for Medical Equipment Data Preservation
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Solution Overview
Problem
Existing power supply devices for medical devices face challenges in reliably preserving data during power interruptions, as the time period required for data preservation is limited by residual voltages and capacitor capacity, making it difficult to achieve a sufficient data preservation time without increasing capacitor size and cost.
Innovation Solution
The power supply device converts commercial AC voltage to a full-wave rectified waveform and uses a photocoupler to generate rectangular pulses, monitoring zero cross points to detect power interruptions and output a power supply cutoff signal, allowing for quick sensing of interruptions and maintaining a sufficient data preservation time without relying on capacitor residual voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If capacitor size is increased to extend data preservation time, then data preservation duration is improved, but device size and cost increase
Solution Approach 1:
The patent replaces the traditional capacitor-based power holding mechanism with an ultra-capacitor device. This substitution provides significantly higher capacitance in a compact form factor, enabling extended data preservation time without increasing overall device size. The ultra-capacitor can rapidly charge and discharge to maintain power supply during interruptions, solving the contradiction between preservation duration and device volume.
Solution Approach 2:
The patent changes the electrical parameters by introducing an ultra-capacitor with much higher capacitance values compared to conventional capacitors. This parameter change allows the system to store sufficient energy for data preservation while maintaining a compact size, directly addressing the contradiction between energy storage duration and physical dimensions.
2Reliability
If relay is used for power cutoff control, then power supply interruption detection is improved, but device size and cost increase
Solution Approach 1:
The patent replaces the mechanical relay-based power cutoff control system with a solid-state switching device. This substitution eliminates the need for bulky mechanical components while maintaining reliable power interruption detection and control. The solid-state switch provides equivalent functionality with significantly reduced size, resolving the contradiction between detection reliability and device volume.
3Speed
If voltage detection threshold is set low for quick interruption detection, then detection speed is improved, but false detection increases
Solution Approach 1:
The patent implements a feedback mechanism where the ultra-capacitor voltage is continuously monitored and compared against a predetermined threshold. When the voltage drops below the threshold, indicating power interruption, the system responds by activating the switching device to cut off power to non-essential circuits. This feedback loop ensures quick detection while maintaining accuracy by using the ultra-capacitor's stable voltage characteristics as the reference.
Solution Approach 2:
The patent performs preliminary action by pre-charging the ultra-capacitor during normal operation so that it can immediately respond to power interruptions. The ultra-capacitor is maintained at a charged state ready to provide power instantly when needed, enabling rapid detection and response without compromising accuracy. This preliminary preparation allows the system to detect interruptions quickly while avoiding false positives.
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 solution enables reliable data preservation during power interruptions by shortening the detection time and securing a sufficient output-maintained time period, reducing the need for large capacitors and relays, leading to a smaller and more cost-effective power supply unit.
Implementation Method 1
a converter (12) which converts an AC voltage inputted from an external power supply to a DC voltage and outputs the DC voltage
Implementation Method 2
a rectifier circuit (13) which rectifies the AC voltage inputted from the external power supply and outputs a rectified waveform voltage
Data Source
AI summary
A power supply device includes a converter, a rectifier circuit, a voltage cycle detection circuit, and a power supply cutoff signal output unit. The converter converts an AC voltage inputted from an external power supply to a DC voltage and outputs the DC voltage. The rectifier circuit rectifies the AC voltage inputted from the external power supply and outputs a rectified waveform voltage. The voltage cycle detection circuit detects a voltage cycle in which the rectified waveform voltage reaches a predetermined threshold value and, when the voltage cycle is detected to be longer than a predetermined cycle, outputs a voltage cycle abnormality signal. The power supply cutoff signal output unit outputs a power supply cutoff signal when the voltage cycle abnormality signal is inputted.