AC Rotary Machine Control Apparatus Abnormality Detection
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Solution Overview
Problem
Conventional AC rotary machine control apparatuses are unable to effectively countermeasure unexpected failures or environmental influences, such as temperature and noise, which can cause predriver ICs to malfunction, leading to unstable operation of AC rotary machines.
Innovation Solution
The AC rotary machine control apparatus includes switching elements, a calculation processing device, a predriver IC, a predriver IC output cutting-off switching element, and a gate driver circuit, which allows the calculation processing device to detect abnormal states and cut off drive signals to the switching elements, enabling the apparatus to maintain a stable state even if the predriver IC fails or malfunctions due to environmental factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a predriver IC is used to drive switching elements, then the control apparatus can achieve compact integration and efficient switching control, but the system becomes vulnerable to unexpected failures and environmental influences causing unstable operation
Solution Approach 1:
The control apparatus performs preliminary detection of abnormality states in the predriver IC through the calculation processing device. By continuously monitoring the predriver IC's operation status and detecting abnormalities before they cause complete failure, the system can take preventive actions to maintain stable operation.
Solution Approach 2:
The calculation processing device acts as an intermediary between the predriver IC and the switching elements. It detects abnormality states in the predriver IC and generates appropriate control signals to adjust the operation of switching elements, thereby compensating for predriver IC failures and maintaining system stability.
2Device complexity
If the predriver IC operates without abnormality detection, then the control apparatus can maintain simple control logic, but it cannot take countermeasures against unexpected failure modes or environmental influences
Solution Approach 1:
The calculation processing device continuously monitors the operation status of the predriver IC and provides feedback control. When an abnormality state is detected, the system adjusts the control signals to the switching elements based on the detected abnormality, enabling adaptive response to various failure modes and environmental influences.
Data Source
AI summary
An AC rotary machine control apparatus is provided with: predriver ICs for giving drive signals to the gates of power converting switching elements bridge-connected to the respective phases of an AC rotary machine; predriver IC output cutting-off switching elements for operating on the basis of a cut-off signal from a calculation processing device having detected an abnormality state of the predriver ICs, and cutting off drive signals given from the predriver ICs to the gates of the power converting switching elements; and a gate driver circuit for becoming conductive on the basis of a signal from the calculation processing device and giving drive signals from a power source circuit to all the gates of the lower arm elements of the power converting switching elements, when drive signals from the predriver Ics are being cut off by the predriver IC output cutting-off switching elements.