Isolation Transformer Inverter for Clean Mains Reconstruction
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Solution Overview
Problem
Traditional inverters face challenges such as high DC offset, asymmetric signal tolerance, common mode noise, inability to select between frequencies or voltages, and lack of precision for sensitive equipment, leading to potential damage and interference.
Innovation Solution
A universal power converter with a multi-phase unfolding bridge circuit, isolation transformer, and feedback loop regulator that generates a precise sine wave, filters noise, and compensates for electrical signals to provide stable voltage and frequency conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a typical inverter uses a bridge output with PWM filter directly connected to the load, then the inverter can provide power conversion functionality, but it generates high common mode noise and DC offsets that create ground loops and measurement/audio noise
Solution Approach 1:
The patent introduces an isolation transformer as an intermediary component between the inverter bridge output and the load. This transformer galvanically isolates the two sides, blocking common mode noise and DC offsets from reaching the load while still allowing power transfer. The transformer acts as a mediator that separates the noisy switching side from the sensitive load side.
Solution Approach 2:
The patent extracts and removes the harmful common mode noise and DC offset components from the power signal before delivery to the load. By using the isolation transformer and proper grounding techniques, these harmful factors are separated from the useful power signal, allowing only the clean AC power to reach the sensitive equipment.
2Adaptability or versatility
If traditional inverters are designed for DC inputs, then they can convert DC to AC, but they require expensive and difficult AC-to-DC conversion for users and lack universal voltage/frequency selection capability
Solution Approach 1:
The patent designs the inverter system to accept both AC and DC inputs through intelligent detection. The system automatically identifies whether the input is AC or DC and adjusts its operation accordingly, providing universal compatibility. This multi-functionality eliminates the need for separate AC-to-DC conversion equipment while maintaining adaptability to different voltage standards (115V/230V) and frequencies (50Hz/60Hz).
3Ease of manufacture
If traditional inverters connect directly to the load, then they provide simple power delivery, but they cannot protect sensitive equipment from power spikes and infrastructure erosion
Solution Approach 1:
The patent incorporates protection mechanisms that cushion against power spikes and electrical aberrations before they reach the sensitive equipment. The isolation transformer and filtering circuits act as protective barriers that absorb and attenuate voltage transients, surges, and noise, protecting the load from infrastructure-related power quality issues.
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 converter significantly reduces DC offset, electromagnetic interference, and ensures precise frequency stability, protecting sensitive equipment from power aberrations and noise, while allowing selection of various frequencies and voltages.
Implementation Method 1
a power factor correction circuit configured to convert the input AC signal to a regulated DC output
Implementation Method 2
a multi-phase unfolding bridge circuit configured to convert the regulated DC output to a substantially pure sinusoidal AC output
Implementation Method 3
an isolation transformer having a primary side and a secondary side, wherein the isolation transformer is configured to receive a full sine wave drive, generated by a dual-phase unfolding bridge circuit and filtered by a modulator output filter and compensation block. This full sine wave drive at the primary side generates on the secondary side a first output AC signal
Implementation Method 4
an AM filter block configured to filter electromagnetic interference noise
Data Source
AI summary
The present disclosure includes a precision voltage and frequency converter, comprising of a power factor correction circuit configured to correct the conduction angle of input AC current, in phase with AC voltage source, a reserve DC filter and energy storage unit, a multi-phase unfolding bridge circuit configured to receive a rectified, isolated, and filtered DC voltage derived from the input AC, a voltage and current feedback pulse-width modulator circuit and compensation circuit configured to modify a signal from the multi-phase unfolding bridge circuit, an isolation transformer having a first side and a second side, wherein the isolation transformer is configured to receive an unfolded half-sine signal generated by the multi-phase unfolding bridge on the first side, the second side of the transformer is regulated via an isolated feedback voltage control circuit and compensation circuit to generate on the second side a first output precision voltage and frequency converted AC signal.