Electric Power Conversion Device Abnormality Detection
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Solution Overview
Problem
Existing DC-DC converters face challenges in accurately detecting abnormal states or malfunctions without increasing complexity or manufacturing costs, particularly when output current exceeds rated levels, due to varying component characteristics and the need for high-performance CPUs.
Innovation Solution
An electric power conversion device with a transformer, DC-AC conversion circuit, and control circuit that compares input current with an instruction value based on output voltage differences, allowing for abnormality state judgment without using output current, using a comparator and control circuit to adjust operations and detect anomalies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional circuits are added to detect output current for abnormality detection, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent uses the transformer as an intermediary element to detect output current abnormalities. Instead of adding dedicated detection circuits, the system leverages the existing transformer's current flow characteristics - when output current exceeds rated values, the transformer's magnetic saturation or heating effects provide detectable signals that indicate abnormality without requiring separate measurement circuits.
Solution Approach 2:
The system uses its own existing components (transformer, control circuit) to perform the detection function. The control circuit monitors parameters already being measured for control purposes and uses these to detect abnormalities, making the system self-diagnostic without additional specialized components.
2Measurement precision
If high-performance CPU is used to detect output current accurately, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive high-performance CPU-based detection systems with simpler, lower-cost components. By using basic comparison circuits and existing transformer characteristics, the system achieves adequate detection accuracy without requiring expensive processing units, thereby reducing manufacturing costs while maintaining functional effectiveness.
3Reliability
If output current detection is implemented to judge abnormality state, then reliability is improved, but device complexity increases
Solution Approach 1:
The control circuit performs multiple functions: it controls the DC-DC converter operation and simultaneously detects abnormality states by monitoring the same current parameters. This multi-functionality eliminates the need for separate detection systems, maintaining reliability while avoiding increased complexity.
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 accurate detection of abnormal states without additional circuits or high-performance CPUs, simplifying the structure and reducing manufacturing costs while maintaining precise control over output voltage.
Implementation Method 1
The transformer (10) is comprised of a primary winding (100) and secondary windings (101, 102)
Data Source
AI summary
An electric power conversion device has a transformer, a DC-AC conversion circuit, an AC-DC conversion circuit and a control circuit. The control circuit calculates an input current instruction value (Iref) based on a difference value (ΔV) between an output voltage (Vout) of the AC-DC conversion circuit and an output voltage instruction value (Vref). A comparator compares an input current (Iin) of the DC-AC conversion circuit with the value (Iref). The DC-AC conversion circuit is controlled by the comparison result of the comparator. The control circuit correctly determines an occurrence of an abnormality state of the electric power conversion device based on the operation state of the comparator, the difference value (ΔV) between the output voltage (Vout) of the AC-DC conversion circuit and the output voltage instruction value (Vref), and the input voltage (Vin) of the DC-AC conversion circuit without using any output current of the AC-DC conversion circuit.