Hall-Effect Current Sensor Mode Switching for Heat and Power Reduction
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Solution Overview
Problem
Conventional current sensors experience overheating and high power consumption in high current or high voltage applications, such as in electric vehicles, due to inefficiencies in their operation.
Innovation Solution
A current sensor system with a magnetic core, a magnetic transducer, an amplifier, a secondary winding, and a switch that operates in either continuous or pulse modes based on control signals to manage heat and power consumption, using a controller unit to adjust operation based on thresholds for temperature, current, and frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the current sensor operates in continuous mode to maintain measurement accuracy, then measurement precision is improved, but power consumption increases and heat generation occurs
Solution Approach 1:
The patent applies periodic action by switching the current sensor between continuous mode and pulse mode based on operating conditions. The controller monitors temperature and current levels, and when thresholds are exceeded, it transitions to pulse mode where the sensor operates intermittently rather than continuously, thereby reducing power consumption and heat generation while maintaining acceptable measurement accuracy through periodic sampling
Solution Approach 2:
The patent implements dynamics by making the operating mode adjustable and adaptive rather than fixed. The system dynamically switches between continuous operation (for high accuracy requirements) and pulse operation (for reduced power consumption) based on real-time monitoring of temperature and current thresholds, allowing the sensor to adapt its behavior to varying operational demands
2Measurement precision
If the current sensor operates in continuous mode to maintain measurement accuracy, then measurement precision is improved, but operating temperature increases
Solution Approach 1:
The controller monitors temperature thresholds and switches the sensor to pulse mode when temperature exceeds acceptable levels. This periodic operation allows the sensor to rest and cool down between measurement cycles, preventing continuous heat accumulation while still providing necessary current measurements at reduced frequency
Solution Approach 2:
The system dynamically adjusts its operating temperature by transitioning between continuous and pulse modes based on real-time temperature monitoring. When temperature thresholds are exceeded, the system shifts to pulse mode to reduce heat generation, and can return to continuous mode when temperature levels are acceptable, creating a dynamic thermal management strategy
3Use of energy by moving object
If the switch operates in pulse mode to reduce power consumption, then power consumption is reduced, but measurement accuracy decreases
Solution Approach 1:
The pulse mode implements periodic sampling of current measurements rather than continuous measurement. By strategically timing these periodic measurements and using appropriate sampling techniques, the system maintains sufficient measurement accuracy for most applications while dramatically reducing average power consumption compared to continuous operation
Solution Approach 2:
The system changes operational parameters by adjusting the duty cycle and timing of pulse mode operation. By optimizing when measurements are taken during pulse cycles and adjusting pulse width and frequency, the system maintains measurement accuracy within acceptable ranges while maximizing power consumption reductions
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 system effectively reduces overheating and power consumption while maintaining accurate current measurement by dynamically switching between continuous and pulse modes, optimizing performance in varying conditions.
Implementation Method 1
a magnetic transducer configured in the air gap; an amplifier coupled to the magnetic transducer
Implementation Method 2
the amplifier is configured to receive an output voltage from the magnetic transducer; and generate an amplified voltage comprising a feedback current
Implementation Method 3
a secondary winding comprising a wire coil that is extended around the core body; a switch coupled between the amplifier and the secondary winding
Implementation Method 4
a Hall-effect sensor configured in the air gap
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A method and apparatus comprising a magnetic core, a Hall-effect sensor configured in an air gap of the magnetic core, an amplifier coupled to the Hall-effect sensor, a driver coupled to the amplifier, a secondary winding comprising (i) a wire coil that is extended around the core body and (ii) a first end coupled to the driver, and (iii) a second end coupled to a sampling resistor, a switch configured to allow a feedback current from the driver to the secondary winding, and a controller unit coupled to the switch, the controller unit configured to (i) receive a digital signal based on a sampling voltage associated with the sampling resistor, (ii) generate one or more control signals based on operating condition data that comprises at least the digital signal exceeding one or more thresholds, and (iii) transmit the one or more control signals to the switch.