Measurement Circuit High-Speed Current Limiting
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Solution Overview
Problem
Conventional measurement circuits face challenges in performing high-speed current limiting due to significant voltage fluctuations at the power point of the amplifier, which affects the accuracy and efficiency of direct current restriction in device under test measurements.
Innovation Solution
The proposed measurement circuit incorporates a clamping circuit with a bias generating section and limiting-current supplying elements, such as diodes, to control and restrict direct current by utilizing feedback elements and bias voltages based on the magnitude relation between limiting and detecting voltages, enabling precise current limiting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional measurement circuit uses an amplifier with power supply voltage for current limiting, then the circuit structure is simple, but the voltage fluctuation at the power point is large causing slow current limiting speed
Solution Approach 1:
The patent introduces a dedicated bias voltage generation circuit as an intermediary component between the power supply and the amplifier. This bias circuit generates a stable reference voltage that mediates the voltage fluctuations, allowing the amplifier to operate with improved stability without requiring major structural changes to the overall measurement system.
Solution Approach 2:
The patent changes the voltage parameter by generating a dedicated bias voltage that is distinct from the main power supply voltage. By adjusting and stabilizing this bias voltage parameter separately, the circuit achieves better voltage control stability at the amplifier's power point, which directly improves the current limiting speed while maintaining reliable operation.
2Measurement precision
If the amplifier operates with large voltage fluctuation at power point, then the circuit design is simpler, but the current limiting accuracy and efficiency deteriorate
Solution Approach 1:
The patent segments the voltage control function by separating the bias voltage generation from the main amplifier circuit. This segmentation allows the bias circuit to be optimized independently for precision, improving current limiting accuracy without significantly complicating the overall device structure. The modular approach enables focused optimization of the critical voltage control portion.
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
This configuration allows for high-speed current limiting and voltage control, improving the accuracy and efficiency of direct current restriction in device under test measurements by minimizing voltage fluctuations and maintaining precise control over current values.
Implementation Method 1
a limiting-current supplying element that is provided between a connecting point between the main amplifier and the feedback element and the first bias generating section and supplies a limiting current restricting the direct current to the device under test via the feedback element in accordance with a voltage difference between a voltage in the connecting point and the bias voltage
Data Source
AI summary
There is provided a measurement circuit including a main amplifier that generates a direct voltage in accordance with an input voltage and applies the generated voltage to a device under test, a feedback element that feeds back the direct voltage to the main amplifier and controls the direct voltage generated from the main amplifier to a voltage according to the input voltage, a current detecting circuit that outputs a detecting voltage according to a current value of the direct current, and a clamping circuit that restricts the current value of the direct current output from the main amplifier, in which the clamping circuit includes a first limiting-voltage output section that outputs a limiting voltage according to a limiting value of the direct current, a first bias generating section that generates a bias voltage making use of the input voltage as a reference voltage based on a magnitude relation between the limiting voltage and the detecting voltage, and a limiting-current supplying element that is provided between a connecting point between the main amplifier and the feedback element and the first bias generating section and supplies a limiting current restricting the direct current to the device under test via the feedback element in accordance with a voltage difference between a voltage in the connecting point and the bias voltage.