Relay State Detection Circuit Resistant to Battery Voltage Fluctuation
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Solution Overview
Problem
Existing relay examination devices in electrical vehicles are affected by voltage fluctuations and require complex circuits to accurately determine the state of high voltage relays, making them costly and inefficient.
Innovation Solution
A relay examination device with a simplified circuit using separate power units and resistor networks to supply current and detect voltage, allowing for accurate examination of relay states without being influenced by battery voltage levels, integrated into a battery management system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate power unit is used to supply current to the relay, then the relay examination is not affected by battery voltage fluctuations, but the device complexity increases
Solution Approach 1:
A separate power unit is introduced as an intermediary to supply examination current to the relay independently of the battery. This mediator ensures that the examination circuit operates with stable voltage regardless of battery fluctuations, enabling accurate relay state detection without being influenced by battery conditions.
Solution Approach 2:
The examination device is segmented into distinct functional modules: a separate power unit for current supply, a voltage detection unit for measuring voltage across the relay, and a control unit for determining relay state. This segmentation allows each component to perform its specific function independently, improving measurement precision while managing complexity through modular design.
2Measurement precision
If additional elements are added to examine relay state accurately, then measurement precision improves, but the device becomes more expensive and complex
Solution Approach 1:
The separate power unit serves multiple functions: it supplies examination current to the relay, provides a stable reference voltage for detection, and enables the voltage detection unit to accurately measure relay state. This multi-functionality reduces the need for additional dedicated components, achieving high measurement precision without proportionally increasing device complexity.
Solution Approach 2:
The voltage detection unit utilizes the voltage signal naturally generated across the relay when examination current flows through it. By detecting this self-generated voltage signal, the system achieves accurate relay state measurement without requiring external signal generators or additional sensing elements, thereby reducing overall device complexity.
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 accurate and cost-effective examination of relay states, reducing additional elements needed and simplifying the circuit, thereby improving reliability and efficiency in monitoring high voltage relays.
Implementation Method 1
a power unit connected to the other end of the second resistor unit and configured to supply power
Implementation Method 2
a voltage detection unit configured to detect a voltage from the one end of the relay
Implementation Method 3
a control unit configured to receive a voltage signal applied between the first resistor unit and the second resistor unit and to examine whether the relay is open or closed or whether the relay has malfunctioned
Data Source
AI summary
The present disclosure relates to a relay examination device and a battery management system including the same, the relay examination device includes a first resistor unit having one end connected to one end of a relay, a second resistor unit having one end connected to the other end of the first resistor unit, a power unit connected to the other end of the second resistor unit and configured to supply power, and a control unit configured to receive a voltage signal applied between the first resistor unit and the second resistor unit and to examine whether the relay is open or closed or whether the relay has malfunctioned.