Current Measurement Circuit Calibration Without Power Interruption
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Solution Overview
Problem
Existing current measurement circuits require power interruption to detect measurement characteristics, which is impractical for systems with continuous electric load demands, and multiple current sensors are needed for accurate diagnosis, complicating the setup.
Innovation Solution
A detection apparatus that uses a current detection circuit to measure reference current values and a control unit to detect measurement characteristics without power interruption, utilizing a single current measurement circuit to accurately determine offset and gain errors while the electric load is powered.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If power interruption is used to detect measurement characteristics, then detection accuracy is improved, but system continuity is worsened
Solution Approach 1:
The patent introduces a known reference current as an intermediary standard to enable continuous measurement characteristic detection. By comparing the current measurement circuit's output against this known reference current without interrupting power supply, the system achieves both continuous operation and accurate detection of offset and gain errors.
2Measurement precision
If multiple current sensors are provided for accurate diagnosis, then measurement precision is improved, but device complexity is worsened
Solution Approach 1:
The patent makes the single current measurement circuit perform multiple functions: it simultaneously measures the reference current and the actual load current. By switching between measurement modes rather than using separate sensors, the system achieves comprehensive diagnosis capability without increasing the number of current sensors or circuit complexity.
Solution Approach 2:
The current measurement circuit serves itself by measuring both the reference current and the load current through the same hardware. The circuit uses its own output characteristics to self-diagnose offset and gain errors, eliminating the need for additional independent measurement devices.
3Measurement precision
If additional current measurement circuits are provided, then measurement precision is improved, but device complexity is worsened
Solution Approach 1:
The patent makes the existing current measurement circuit perform multiple functions: it simultaneously measures the reference current and the actual load current. By switching between measurement modes rather than using separate sensors, the system achieves comprehensive diagnosis capability without increasing the number of current sensors or circuit complexity.
Data Source
AI summary
A detection apparatus (a current detection circuit and a control unit) which detects a measurement characteristic of a current measurement circuit which measures a current value of a current that flows through a circuit, the detection apparatus including: the current detection circuit which detects, for a plurality of reference current values different from each other, a flow of the reference current value having occurred in the circuit; and the control unit, in which the control unit measures, when the flow of the reference current value is detected to have occurred, a plurality of current values by the current measurement circuit, and detects the measurement characteristic of the current measurement circuit on the basis of the plurality of reference current values and the plurality of current values measured by the current measurement circuit.