18670477. ABNORMALITY DETECTION APPARATUS simplified abstract (DENSO CORPORATION)
Contents
ABNORMALITY DETECTION APPARATUS
Organization Name
Inventor(s)
KUNIHIKO Matsuda of Kariya-city (JP)
ABNORMALITY DETECTION APPARATUS - A simplified explanation of the abstract
This abstract first appeared for US patent application 18670477 titled 'ABNORMALITY DETECTION APPARATUS
Simplified Explanation: The patent application describes a monitoring voltage output unit that detects overcurrent abnormalities in an inverter by monitoring the current flowing through shunt resistors connected to upper and lower arm elements of each phase. When the monitoring voltage exceeds a reference value, an overcurrent flag is triggered, leading to the determination of abnormal inverter operation and the cessation of energization.
- The monitoring voltage output unit has a positive correlation with the current flowing through shunt resistors in the inverter system.
- A monitoring circuit detects overcurrent abnormalities caused by stuck upper or lower arm elements in the inverter.
- A comparator triggers an overcurrent flag when the monitoring voltage surpasses a set reference value.
- A determination unit stops the energization of the inverter when the cumulative overcurrent flag output time or the number of overcurrent flag outputs reaches predefined thresholds.
Potential Applications: 1. Industrial automation systems 2. Renewable energy systems 3. Electric vehicle powertrains
Problems Solved: 1. Detection of inverter overcurrent abnormalities 2. Prevention of inverter damage due to stuck arm elements 3. Ensuring safe and efficient operation of inverters
Benefits: 1. Enhanced safety in inverter operation 2. Prevents damage to inverter components 3. Improves overall system reliability
Commercial Applications: The technology can be applied in various industries such as manufacturing, energy production, and transportation for efficient and safe operation of inverters.
Questions about the Technology: 1. How does the monitoring voltage output unit detect overcurrent abnormalities in the inverter system? 2. What are the specific thresholds used by the determination unit to stop the energization of the inverter?
Frequently Updated Research: Ongoing research in the field focuses on improving the sensitivity and accuracy of the monitoring circuit to detect overcurrent abnormalities in real-time operation.
Original Abstract Submitted
A monitoring voltage output unit outputs a monitoring voltage that has a positive correlation with the current flowing through a shunt resistor connected in series with an upper arm element and a lower arm element of each phase. A monitoring circuit monitors an inverter overcurrent abnormality due to an upper arm element or a lower arm element of one or more phases being stuck in an ON state based on the monitoring voltage. A comparator of the monitoring circuit outputs an overcurrent flag of a pulse signal when the monitoring voltage is larger than a reference value. A determination unit determines that an inverter overcurrent is abnormal and stop energization of an inverter, when a cumulative output time of the overcurrent flag of at least one phase reaches a time threshold or when number of outputs of the overcurrent flag reaches a number threshold.
