Power Supply Circuit for Switch Anomaly Detection Under Bypass Current
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Solution Overview
Problem
Existing power feeding circuits face difficulties in accurately determining anomalies in semiconductor switches, such as short circuit or open failures, due to parallel-connected bypass resistors allowing current flow regardless of the switch state.
Innovation Solution
A power supply apparatus with a first circuit in parallel to the switching element, a second circuit between conduction paths, and an anomaly determination unit that assesses voltage differences to accurately identify anomalies by controlling the second circuit's current conduction state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a bypass resistor is connected in parallel to a semiconductor switch, then current can flow to the load regardless of the switch state, but anomaly detection in the semiconductor switch becomes difficult
Solution Approach 1:
The circuit is divided into multiple conduction paths: a first conduction path through the semiconductor switch and a second conduction path through the bypass resistor. By segmenting the current flow paths, the patent enables independent analysis of each path's contribution to the total current, allowing anomaly detection while maintaining continuous current flow to the load.
Solution Approach 2:
A current sensor is introduced as an intermediary element to measure the current flowing through the bypass resistor. This mediator provides indirect information about the semiconductor switch's state by measuring the bypass current, enabling anomaly detection without disrupting the continuous current flow to the load.
2Reliability
If a bypass resistor is connected in parallel to a semiconductor switch, then the load receives continuous current, but it becomes impossible to distinguish between normal and abnormal switch states
Solution Approach 1:
The patent implements feedback by continuously monitoring the bypass resistor current and comparing it against expected values. The control device receives feedback about the switch state through current measurements and can respond appropriately, enabling reliable anomaly detection while maintaining continuous load power supply.
Solution Approach 2:
The patent replaces direct mechanical/electrical switch state observation with an electrical measurement approach. Instead of directly observing the switch state, the system uses electrical current measurements through the bypass resistor to infer the switch state, substituting a measurement-based approach for direct state observation.
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 high-accuracy anomaly detection in switching elements connected in parallel, preventing false positives and maintaining the load in a standby state without resetting.
Implementation Method 1
a first circuit that includes a first resistor portion and is provided in parallel to the first switching element; The first circuit is configured such that a current flows from the power supply unit to the load via the first resistor portion
Implementation Method 2
a second circuit that is provided between a first conduction path, of the power path, between the first circuit and the load, and a second conduction path, which is grounded; the second circuit is configured such that a current flows from the first conduction path to the second conduction path when in a current conduction state
Implementation Method 3
an anomaly determination unit configured to determine an anomaly based on a voltage of the first conduction path
Data Source
AI summary
A power supply apparatus includes a first circuit, a second circuit, a control unit, and an anomaly determination unit. The first circuit includes a first resistor portion, and is provided in parallel to the first switching element. The second circuit is provided between a first conduction path and a second conduction path. The first circuit is configured such that a current flows from the power supply unit to the load via the first resistor portion. The second circuit is configured such that a current flows from the first conduction path to the second conduction path when in a current conduction state. The anomaly determination unit determines an anomaly based on a voltage of the first conduction path when the second circuit is in the current conduction state.