Relay Diagnosis Circuit for Simultaneous Main-Relay Detection
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Solution Overview
Problem
Conventional relay diagnosing devices are unable to simultaneously diagnose the state of both positive and negative main relays in a parallel battery pack system, necessitating separate diagnosing sequences for each relay.
Innovation Solution
A relay diagnosing apparatus and method using a resistor dividing circuit with a common mode voltage differential amplifier to determine relay states by comparing input voltages through a resistor dividing circuit, allowing simultaneous diagnosis of both main relays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional relay diagnosing devices are used in parallel battery pack systems, then separate diagnosing sequences are required for each relay, but this increases diagnosing time and reduces productivity
Solution Approach 1:
The patent combines the diagnosis of multiple relays (positive main relay and negative main relay) into a single unified diagnosing sequence. The resistor dividing circuit merges the diagnostic paths of multiple relays, allowing simultaneous measurement and evaluation of all relays through one diagnostic process, thereby eliminating the need for separate diagnosing sequences and improving productivity.
Solution Approach 2:
The resistor dividing circuit serves multiple functions: it divides voltages for multiple relay diagnoses, provides common reference voltages, and enables simultaneous monitoring of multiple relays. This multi-functional design allows a single diagnostic device to handle all relay diagnoses in parallel battery pack systems, reducing both time and complexity.
2Measurement precision
If separate diagnosing sequences are used for each relay, then each relay can be diagnosed individually, but the diagnosing process becomes more complex and less efficient
Solution Approach 1:
The resistor dividing circuit acts as an intermediary that simplifies the diagnostic process. It automatically divides and distributes reference voltages to multiple diagnostic points, eliminating the need for complex manual voltage distribution and switching sequences. This intermediary structure maintains measurement precision while significantly reducing process complexity.
3Productivity
If conventional diagnostic methods are used, then individual relay diagnosis is possible, but simultaneous diagnosis of multiple relays is not achievable
Solution Approach 1:
The resistor dividing circuit segments the voltage reference distribution into distinct, independent paths for each relay, while maintaining a unified diagnostic structure. This segmentation allows simultaneous independent measurement of multiple relays without interference, enabling both high productivity and operational simplicity through modular voltage distribution.
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 diagnosis of relay stuck-closed states in all situations using a simpler circuit and method, improving efficiency in parallel battery pack systems.
Implementation Method 1
a relay diagnosis voltage generating apparatus that includes a resistor dividing circuit including a first resistance element and a second resistance element connected in series between both ends of the main relay; and a voltage divider that generates the relay diagnosis voltage based on a voltage applied to the main relay and a resistance ratio between the first resistance element and the second resistance element
Data Source
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AI summary
An apparatus for diagnosing a main relay that controls connection between a battery pack and a load may comprise a resistor dividing circuit including a plurality of resistors, wherein the resistor dividing circuit is connected between a first main relay connected to a positive terminal of the battery pack and the load and between one end of a second main relay connected to the negative terminal of the battery pack and the other end of the second main relay, and a diagnosing module connected to the resistor dividing circuit and a voltage source and configured to output a relay diagnosis voltage to be used for diagnosing the first main relay and the second main relay.