Motor Battery Heating Circuit With Half-Wave Current Noise Reduction
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Solution Overview
Problem
Conventional battery heating methods using motor neutral points fail to adequately reduce significant vibration noise during the motor-based battery heating process.
Innovation Solution
A battery heating method that controls switching states of transistors in a switch circuit to generate a half-wave current in the motor, increasing current harmonics in stator windings and dispersing vibration noise energy, while maintaining the battery heating effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If motor-based heating is used to heat the battery, then heating function is achieved, but significant vibration noise is generated
Solution Approach 1:
The patent changes the current waveform parameter from conventional full-wave to half-wave current, which modifies the harmonic content and distribution of the motor operation. This parameter change disperses the vibration noise energy across different frequency bands, reducing the peak noise levels while maintaining the battery heating function.
Solution Approach 2:
The patent employs periodic switching of the motor phases with half-wave current patterns, creating a periodic action that distributes the heating energy and vibration noise over time. The controlled switching cycles allow the motor to heat the battery while the periodic nature of the half-wave current helps disperse vibration noise energy.
2Temperature
If conventional motor heating with neutral point is used, then heating function is provided, but vibration noise remains significant
Solution Approach 1:
The patent fundamentally changes the current waveform parameter from conventional full-wave to half-wave current, which modifies the harmonic content and distribution of the motor operation. This parameter change disperses the vibration noise energy across different frequency bands, reducing the peak noise levels while maintaining the battery heating function.
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
Reduces vibration noise during the motor-based battery heating process by increasing current harmonics in stator windings, effectively alleviating noise without affecting battery heating efficiency.
Implementation Method 1
controlling switching states of switching transistors in the switch circuit in response to the heating enable signal, so as to generate a half-wave current in the motor to heat the battery
Data Source
AI summary
This application relates to a battery heating method, a battery heating circuit, and an electric device. The method includes: acquiring a heating enable signal indicating that a motor is to heat a battery based on a heating circuit, and controlling switching states of switching transistors in a switch circuit in response to the heating enable signal, so as to generate a half-wave current in the motor to heat the battery, where a current waveform of each phase stator winding during the motor-based battery heating process is a half-wave current waveform, thereby increasing current harmonics in stator windings of the motor and dispersing vibration noise energy during the motor-based battery heating process. Thus, as compared to conventional technologies, the vibration noise during the motor-based battery heating process in the embodiments of this application is reduced, thereby alleviating the vibration noise issue during the motor-based battery heating process.