Current Detection Circuit for Signal Component Analysis
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Solution Overview
Problem
Conventional current detection circuits struggle to detect very small signal components due to minimal voltage changes across resistors, rendering them ineffective in distinguishing between DC and signal components in input currents, particularly in the context of infrared remote controllers.
Innovation Solution
A current detection circuit comprising an input port, rectifying element, current control circuit, field effect transistor, and voltage detection circuit, which utilizes a load element and transistor configuration to amplify voltage changes, enabling detection of small signal components by monitoring the gate voltage of the transistor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional current detection circuits use voltage changes across resistors to detect signal components, then the circuit structure is simple, but the measurement precision deteriorates when the current change due to signal component is very small
Solution Approach 1:
The patent introduces a current control circuit as an intermediary between the input current and the voltage detection circuit. This current control circuit converts the input current into a controlled current that flows through the load element, enabling the voltage detection circuit to measure voltage changes that correspond to the signal component with higher precision without requiring a complex circuit structure
Solution Approach 2:
The patent replaces the conventional resistor-based voltage detection method with a transistor-based current control system. The field effect transistor in the current control circuit provides a more sensitive and precise way to convert current changes into voltage changes, overcoming the limitation of conventional resistor-based detection for very small signal components
2Measurement precision
If the amount of current change due to signal component is very small, then the DC component can be maintained stable, but the voltage change at resistor ends becomes too small to detect
Solution Approach 1:
The patent changes the detection parameter from direct voltage measurement across a resistor to voltage measurement across a load element in a transistor-based current control circuit. This parameter change enables the circuit to amplify the voltage signal corresponding to small current changes, making them detectable while maintaining stable DC operation
Solution Approach 2:
The current control circuit acts as an intermediary that translates small current changes into measurable voltage changes across the load element. This intermediary conversion process enables precise detection of very small signal components that would otherwise be undetectable through direct voltage measurement
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
The circuit effectively detects current changes due to very small signal components by leveraging the transistor's gate voltage changes, enhancing the ability to differentiate between DC and signal components in input currents.
Implementation Method 1
a rectifying element; a current control circuit; a rectifying element
Implementation Method 2
a first transistor, which is a first conductivity type field effect transistor; The gate of the first transistor is configured to connect the input port and a cathode terminal of the rectifying element to a second power source terminal via the load element
Implementation Method 3
a voltage detection circuit including a voltage detection terminal and a detection result output port
Data Source
AI summary
A current detection circuit includes: an input port, an output port; a rectifying element; a current control circuit; a load element, a first transistor, which is a first conductivity type field effect transistor; and a voltage detection circuit including a voltage detection terminal and a detection result output port. The current control circuit includes a first terminal, connected to a first power source terminal, and a second terminal, connected to an anode terminal of the rectifying element, a drain of the first transistor, and the voltage detection terminal of the voltage detection circuit. A gate of the first transistor is configured to connect the input port and a cathode terminal of the rectifying element to a second power source terminal via the load element. The output port is connected to the detection result output port of the voltage detection circuit.