Analog converter for motor angle sensor

Patent metadata

Field	Value
Publication number	US-10218378-B1
Application number	US-201816104648-A
Country	US
Kind code	B1
Filing date	Aug 17, 2018
Priority date	Aug 17, 2018
Publication date	Feb 26, 2019
Grant date	Feb 26, 2019

Abstract

An analog converter for a motor angle sensor is described. The analog converter for a motor angle sensor includes Gilbert Cells configured to receive a signal from a motor angle sensor, an intermediate frequency signal source configured to provide an excitation signal to the Gilbert Cells, a low-pass filter configured to receive an output from the Gilbert Cells, a Scott transformer to convert a three-phase waveform into a two-phase waveform, and output a converted signal to an electronic controller.

First claim

What is claimed is:

1. An analog converter for a motor angle sensor, comprising:
at least two Gilbert Cells configured to receive a signal from a motor angle sensor,
an intermediate frequency signal source configured to provide an intermediate frequency signal to the at least two Gilbert Cells, and
a low-pass filter configured to receive an output from the at least two Gilbert Cells and output a converted signal to an electronic controller.

2. The converter of claim 1 , wherein the received signal includes three phases and the converted signal includes two phases.

3. The converter of claim 2 , further comprising a Scott transformer.

4. The converter of claim 3 , wherein the Scott transformer converts the output from the at least two Gilbert Cells to the converted signal.

5. The converter of claim 1 , wherein the converter includes only two Gilbert Cells.

6. The converter of claim 1 , wherein the converter includes three Gilbert Cells.

7. The converter of claim 1 , wherein the at least two Gilbert Cells mix the intermediate frequency signal and the received signal to create the output from the at least two Gilbert Cells.

8. The converter of claim 1 , wherein the motor angle sensor detects an absolute position and rotational speed of a rotor of an electric motor.

9. The converter of claim 1 , wherein an analog-to-digital converter converts the output from the at least two Gilbert Cells to the converted signal and the converted signal is a sine/cosine signal.

10. The converter of claim 9 , wherein the converted signal is a digital signal, and a digital to analog converter is used to convert the converted signal to a signal usable by the electronic controller.

11. The converter of claim 1 , further comprising a plurality of low-pass filters.

12. The converter of claim 11 , wherein a number of the plurality of low-pass filters is equal to a number of Gilbert Cells.

13. The converter of claim 1 , wherein the excitation signal has a frequency equal to the difference between a frequency of the received signal from the motor angle sensor and a desired frequency of the output of the at least two Gilbert Cells.

14. The converter of claim 1 , wherein the motor angle sensor has a number of channels equal to a number of Gilbert Cells.

15. The converter of claim 1 , wherein the output of the at least two Gilbert Cells contains two main frequencies, the two main frequencies being above and below an original frequency of the received signal from the motor angle sensor.

16. The converter of claim 15 , wherein the low-pass filter filters out frequencies above the original frequency.

Assignees

• Bosch Gmbh Robert

Inventors

• Spriet Kurt William
• Buchenberg Patrick

Classifications

• G01D5/2497

  Absolute encoders (G01D5/2454 takes precedence) · CPC title

• G01D5/2454

  Encoders incorporating incremental and absolute signals · CPC title

• H03M1/645 Primary

  for position encoding, e.g. using resolvers or synchros (H03M1/485 takes precedence) · CPC title

• G01D5/243

  influencing the phase or frequency of AC · CPC title

• G01D5/204

  by influencing the mutual induction between two or more coils (G01D5/22 takes precedence) · CPC title