Voltage Conversion Device Failure Detection Circuit
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Solution Overview
Problem
Conventional voltage conversion devices face difficulties in detecting various failure patterns in switching elements during operation, particularly in insulation type DC-DC converters, due to complex circuit configurations required for monitoring both switching elements.
Innovation Solution
A voltage conversion device with a simplified circuit configuration that includes a first conversion circuit with a main and auxiliary switching element, an input inductor, and capacitors, where a voltage detection circuit monitors the connection point of the auxiliary switching element and the first capacitor to detect failures in both switching elements based on voltage changes over predetermined periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate voltage detection circuits are provided for each switching element to detect various failure patterns, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the voltage detection functions for both switching elements into a single voltage detection circuit that monitors the voltage at the connection node between the first capacitor and auxiliary switching element. This single circuit can detect failure patterns in both the main switching element and auxiliary switching element by analyzing voltage changes during different switching periods, thereby reducing device complexity while maintaining comprehensive failure detection capability.
Solution Approach 2:
The voltage detection circuit is designed with multi-functionality to detect various failure patterns (on-failure and off-failure) in both switching elements using a single monitoring point. By universally monitoring the connection node voltage across different switching phases, the circuit achieves comprehensive failure detection without requiring separate dedicated detection circuits for each switching element.
2Device complexity
If a simple circuit configuration is used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent uses the connection node between the first capacitor and auxiliary switching element as an intermediary monitoring point that provides information about the state of both switching elements. By placing the voltage detection circuit at this strategic intermediary location, the system achieves comprehensive failure detection capability with a single monitoring point, maintaining measurement precision while simplifying the overall circuit configuration.
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 detection of various failure patterns in switching elements with a reduced circuit complexity, allowing for the identification of on and off failures in both the main and auxiliary switching elements without the need for separate voltage detection circuits for each element.
Implementation Method 1
a first conversion circuit that converts a DC voltage of a DC power supply into an AC voltage by switching of the DC voltage is provided on the input side, and a second conversion circuit that converts the AC voltage converted with the first conversion circuit into a DC voltage by rectification of the AC voltage is provided on the output side. The first conversion circuit and the second conversion circuit are insulated from each other using a transformer.
Data Source
AI summary
A voltage conversion device includes a first conversion circuit, a second conversion circuit, a voltage detection circuit, and a CPU (failure detector). The first conversion circuit switches a DC voltage at a DC power supply to convert the DC voltage into an AC voltage. The second conversion circuit rectifies the AC voltage converted with the first conversion circuit to convert the AC voltage into a DC voltage. The voltage detection circuit detects voltage at a connection point of an auxiliary switching element and a first capacitor. The CPU monitors a change in voltage at the connection point in a predetermined period, the voltage being detected with the voltage detection circuit, and detects failure that occurs in one of or both a main switching element and the auxiliary switching element during operation based on the change in the voltage.