Universal Input Interface for Mixed Key Injector Signal Types
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current high-frequency tactical transmission/reception stations require multiple connectors for different encryption key injectors with varying voltage characteristics, leading to complexity and limited compatibility.
Innovation Solution
An input interface with a single connector that uses a voltage divider bridge and comparator circuit to handle both variable voltage and open collector signals, allowing connection of different key injectors without multiplying connectors, by ensuring the comparator operates within safe voltage ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple connectors are provided for different key injectors with varying voltage characteristics, then compatibility with different injectors is improved, but device complexity increases
Solution Approach 1:
The patent implements a universal connector design where a single connector accepts multiple types of key injectors (variable voltage and open collector types). The interface circuitry automatically adapts to different injector types through voltage detection and appropriate signal routing, eliminating the need for multiple specialized connectors while maintaining full compatibility with various injector standards
Solution Approach 2:
The interface circuit detects the voltage characteristics of the connected key injector and dynamically adjusts its operating parameters. For variable voltage injectors, the circuit accepts voltages up to a predetermined maximum. For open collector injectors, the circuit provides appropriate pull-up resistance and voltage levels. This parameter adaptation allows a single connector to handle different signal types without requiring physical connector variations
2Device complexity
If a single connector is used for different key injectors, then device complexity is reduced, but the risk of damage from voltage mismatches increases
Solution Approach 1:
Before processing the key injector signal, the circuit performs preliminary voltage detection and characterization. The interface measures the voltage level and determines whether the connected device is a variable voltage or open collector type. Based on this preliminary assessment, the circuit configures appropriate protection mechanisms and signal conditioning parameters, preventing voltage mismatch damage before it occurs
Solution Approach 2:
The patent introduces intermediary protection circuitry between the connector and the internal processing components. This intermediary layer includes voltage clamping diodes, current-limiting resistors, and detection circuits that mediate between the external key injector and the internal logic. These intermediaries absorb voltage spikes and prevent harmful voltages from reaching sensitive internal components, regardless of the injector type connected
3Reliability
If multiple connectors are provided for different signal types, then signal integrity is maintained, but ease of operation deteriorates
Solution Approach 1:
The interface circuit is designed to automatically detect and adapt to the connected key injector type without requiring user intervention. When a key injector is connected, the circuit self-tests the voltage characteristics, determines the appropriate signal protocol, and configures itself accordingly. This self-service capability eliminates the need for users to manually select or configure connectors, making operation as simple as plugging in any compatible key injector
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 the use of multiple auxiliary devices with different signal characteristics using a single connector, preventing damage to the interface and simplifying the station's design while ensuring secure encrypted communications.
Implementation Method 1
the input is connected to a reference potential by a first voltage divider bridge
Implementation Method 2
the midpoint of which is connected to the positive terminal of an open-loop comparator, the output of which is connected to the second output
Data Source
Figure 1
Figure 2
AI summary
The input interface for a radio transmit/receiver station comprises: - an input (30A) for receiving a signal either of a variable voltage varying over a predetermined voltage span, or of an open-collector signal having a voltage (0V) corresponding to the low logic state; - a first output (30B) for the variable voltage signal; a second output (30C) as open collector; the first and second outputs (30C, 30B) are linked to the same input (30A) and the input (30A) is linked to a reference potential by a first voltage divider bridge (44) whose midpoint (44C) is linked to the positive terminal of an open-loop comparator (42), the output of which is linked to the second output (30C).