Control Module Magnetic Field Suppressor for Current Sensor Noise
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Solution Overview
Problem
The increasing output power of electric motors in hybrid and electric vehicles leads to larger battery modules, which can result in a reduced separation distance between the relay and current sensor in the charge/discharge circuit unit, causing the current sensor to be affected by electromagnetic noise.
Innovation Solution
A control module configuration with a busbar, switch, and current sensor, where the current sensor includes a magneto-electric transducer and a magnetic field suppressor, and the switch has magnets that create a magnetic field perpendicular to the height direction, allowing the magnetic field suppressor to prevent external magnetic fields from interfering with the current sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the battery module size is increased to meet higher output power requirements, then the output power capability is improved, but the separation distance between the relay and current sensor is reduced, causing electromagnetic noise interference
Solution Approach 1:
A magnetic field suppressor is introduced as an intermediary component between the relay and current sensor. This suppressor acts as a mediator that blocks the harmful magnetic field generated by the relay from reaching the current sensor, thereby eliminating the electromagnetic noise interference while allowing the compact battery module design to be maintained.
Solution Approach 2:
The invention converts the harmful electromagnetic noise generated by the relay into a controllable magnetic field that can be selectively blocked. By positioning the magnetic field suppressor strategically, the harmful effect of the magnetic field on the current sensor is eliminated, while the compact layout enabled by higher power density is preserved.
2Volume of moving object
If the separation distance between relay and current sensor is reduced to accommodate larger battery modules, then the battery module size efficiency is improved, but the current sensor detection accuracy deteriorates due to electromagnetic noise
Solution Approach 1:
The magnetic field suppressor serves as a protective intermediary that shields the current sensor from the relay's magnetic field. This allows the current sensor to maintain high detection accuracy even when positioned close to the relay, thereby enabling compact battery module design without sacrificing measurement precision.
Solution Approach 2:
The magnetic field suppressor is a simple, cost-effective component that provides effective shielding. By using this relatively simple component, the invention achieves protection of the current sensor at minimal cost and complexity, enabling compact design while maintaining measurement accuracy.
3Quantity of substance
If the battery module size is increased, then the capacity is improved, but the charge/discharge circuit unit size must be reduced, making it harder to maintain adequate separation between components
Solution Approach 1:
The magnetic field suppressor acts as a space-efficient intermediary that provides electromagnetic shielding without occupying significant volume. This allows the charge/discharge circuit unit to be compact while still maintaining adequate functional separation between the relay and current sensor, facilitating easier layout in space-constrained applications.
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 enables a shorter separation distance between the switch and current sensor while maintaining detection accuracy, effectively suppressing electromagnetic noise and ensuring reliable current measurement.
Implementation Method 1
The magneto-electric transducer is configured to convert a magnetic field, which depends on the electric current flowing through the busbar and passes through the magneto-electric transducer along a plane perpendicular to the height direction, into an electrical signal
Implementation Method 2
The magnetic field suppressor is configured to suppress external magnetic fields from passing through the magneto-electric transducer along the plane perpendicular to the height direction
Implementation Method 3
The magnets are magnetized in a lateral direction, which is perpendicular to both the longitudinal direction and the height direction, and opposed to each other in the lateral direction. The magnets create a magnetic field which is mainly along a plane perpendicular to the height direction
Data Source
AI summary
A control module is arranged in alignment with a battery module in a longitudinal direction. The control module includes a busbar, a switch and a current sensor configured to detect electric current flowing through the busbar. The current sensor includes a magneto-electric transducer and a magnetic field suppressor. The magneto-electric transducer is configured to convert a magnetic field, which depends on the electric current flowing through the busbar and passes through the magneto-electric transducer along a plane perpendicular to a height direction, into an electrical signal. The magnetic field suppressor is configured to suppress external magnetic fields from passing through the magneto-electric transducer along the plane perpendicular to the height direction. The switch includes a pair of magnets that are magnetized and opposed to each other in a lateral direction perpendicular to both the longitudinal and height directions. The current sensor is aligned with the magnets in the longitudinal direction.