TMR magnetic encoder system based on Kalman filtering

Abstract

The invention discloses a TMR magnetic encoder system based on Kalman filtering. The system comprises a stabilized voltage supply module, a signal generation unit, an ADC module, a filter circuit module, a signal processing module and a signal output module. The signal generation unit is connected with the ADC module; the ADC module is connected with the signal processing module; the signal outputmodule is connected to the signal processing module. The signal generation unit adopts an TMR sensor; compared with the traditional Hall sensor, the TMR sensor enables power consumption of the signalgeneration to be reduced by three orders of magnitudes, the sensitivity to be improved by three orders of magnitudes, and the quality of generated signals to be improved. Moreover, a Kalman filteringalgorithm is added to a signal processing part, so that an output signal is more stable, the resolution and precision of the signal can be improved, and the stability of the signal is improved. And angle analysis is carried out on the waveform after Kalman filtering, logic information division is carried out according to the angle, a universal interface circuit is configured for a magnetic encoder, and finally the waveform is outputted in the form of a pulse signal.

Description

technical field [0001] The invention relates to a magnetic encoder, in particular to a TMR magnetic encoder system based on Kalman filtering. Background technique [0002] In the prior art, magnetic encoders are mainly based on Hall, Anisotropic Magneto Resistive (AMR) and Giant Magneto Resistive (GMR) to generate signals, but their power consumption is high and their size is large , The response time is slow, which greatly limits the miniaturization process of the magnetic encoder. Therefore, the current magnetic encoder requires a large number of circuit units for noise reduction processing, so the size is large and the application range is limited. [0003] The current signal generating units mostly use Hall sensors, AMR sensors and GMR sensors, which are easily affected by temperature changes and cause output signal disturbances. Therefore, the range of applications is not very wide due to temperature limitations, which limits the market for magnetic encoders. occupanc...

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Problems solved by technology

[0003] The current signal generating units mostly use Hall sensors, AMR sensors and GMR sensors, which are easily affected by temperature changes and cause output signal disturbances. Therefore, the range of applications is not very wide due to temperature limitations, which limits the market for magnetic encoders. share of

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