Generator Measurement Circuit for Grid Internal Resistance Check
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Solution Overview
Problem
High-power electrical energy generators face challenges in accurately assessing their power supply capability, particularly when connected to a power grid, due to unknown internal resistance changes over time, which can lead to inadequate high-power output and invalid exposures in medical imaging applications like X-ray generators.
Innovation Solution
An automatic measurement circuit that includes a discharge loop with a switch and discharge resistor, a rectifying and filtering circuit, and a calculating unit to measure bus voltage and discharge current, allowing for the calculation of internal resistance and maximum electrical power, ensuring reliable power supply and preventing exposure failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the electrical energy generator is connected to the power grid for high-power operation, then the power supply capability is improved, but the internal resistance changes over time causing measurement inaccuracy and unreliable power supply
Solution Approach 1:
The patent implements preliminary measurement of the power grid's internal resistance before high-power operation. The control circuit activates the discharge loop to measure internal resistance in advance, stores this data, and uses it to determine whether the grid can support high-power operation. This preliminary action prevents unreliable power supply during operation by identifying unsuitable conditions before they cause failures.
2Measurement precision
If the internal resistance of the power grid is not measured, then the device complexity is reduced, but the measurement precision of power supply capability deteriorates
Solution Approach 1:
The patent introduces a discharge loop with a discharge resistor as an intermediary measurement mechanism. By measuring the voltage across the discharge resistor when activated, the system indirectly determines the power grid's internal resistance without requiring direct complex measurement equipment. This intermediary approach achieves precise measurement while keeping the added circuit complexity manageable.
Solution Approach 2:
The power grid itself serves as the measurement load through the discharge loop. The control circuit utilizes the power grid's own electrical characteristics and the discharge loop to perform self-measurement of internal resistance. This self-service approach eliminates the need for external complex measurement devices, achieving accurate measurement with minimal additional complexity.
3Measurement precision
If the switch remains closed continuously for discharging, then the internal resistance measurement is improved, but the energy loss increases
Solution Approach 1:
The control circuit implements periodic rather than continuous discharge for internal resistance measurement. The switch is closed for brief measurement intervals and then opened, repeating this cycle as needed. This periodic action obtains sufficient measurement data while dramatically reducing energy loss compared to continuous discharge, maintaining measurement precision while conserving energy.
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 real-time assessment of power grid capacity and internal resistance, ensuring successful high-power operations and preventing exposure failures, even in regions with poor energy resources, by simulating electricity consumption and calculating maximum output power.
Implementation Method 1
a discharge loop, having a switch and a discharge resistor connected in series, the discharge resistor discharging electrical energy generated by the electrical energy generator
Data Source
AI summary
An automatic measurement circuit of an electrical energy generator, where the electrical energy generator having an input end connected to a power grid, and an output end connected to an electrical component, may include a discharge loop, having a switch and a discharge resistor connected in series, the discharge resistor discharging electrical energy generated by the electrical energy generator; a control circuit, which controls opening and closing of the switch; where, before the electrical energy generator supplies power to the electrical component, the control circuit controls the switch to close for a first duration, to perform discharging through the discharge resistor. The electrical energy generator and an automatic measurement circuit may measure the electrical energy output status of the electrical energy generator.