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Hall effect sensor circuit with offset compensation

A Hall effect, sensor technology, used in instruments, measuring devices, measuring magnetic variables, etc., can solve problems such as response speed limitations

Active Publication Date: 2017-08-18
THE TIMKEN CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the response speed is limited by the low-pass filter

Method used

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  • Hall effect sensor circuit with offset compensation
  • Hall effect sensor circuit with offset compensation
  • Hall effect sensor circuit with offset compensation

Examples

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no. 2 example

[0048] Figure 4 and 5 A Hall effect sensor circuit arrangement 10 is shown for another embodiment of the invention which is very similar to figure 1 and 2 Examples in . Accordingly, circuit elements are listed with the same reference numbers. Figure 4 and 5 and figure 1 and 2 The only difference in the circuit of the embodiment of 22 is the operational amplifier 22. Opamp 22 makes the positive output instead of as figure 1 and 2 The negative output of is connected to adder 24. Likewise, amplifier 22 makes the negative output rather than as figure 1 and 2 The positive output of is connected to adder 26.

[0049] because Figure 4 and 5 The Hall effect sensor circuit arrangement 10 adds and subtracts the Hall voltage in an inverse manner as the output of the amplifier 22 in the circuit changes. The calculation of the sum of the Hall voltages of the Hall effect sensors 12, 14 is obtained to be substantially related to figure 1 and 2 obtained in the same manner ...

no. 3 example

[0052] Figure 6 and 7 A Hall effect sensor circuit arrangement 10 is shown for another embodiment of the invention, which is similar to parts of the above embodiments, except that a single Hall effect sensor is utilized with respect to offset compensation. Since a single Hall effect sensor is provided, adders 24, 26 and other components are not required. Due to the similarity of arrangement, circuit elements are listed with the same reference numbers. exist Figure 6 , a cross-shaped Hall effect sensor 12 senses the presence / absence and strength of a magnetic field. Hall effect sensor 12 includes terminals A-D connected to its four arms. Switching unit 16 includes a pair of switches 16 - 1 , 16 - 2 that connect terminals A-D of Hall effect sensor 12 to operational amplifier 20 . A bias circuit (not shown) is connected to terminal C-A to provide a bias current flowing from terminal C to terminal A. Operational amplifier 20 includes positive and negative voltage inputs, a...

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Abstract

A method and apparatus for sensing magnetic field strength with a pair of Hall effect sensors include sampling a sensed voltage for the Hall effect sensors during a first phase and combining the sensed voltage; and during a second phase, obtaining sensed voltages for the Hall effect sensors and combining the sensed voltages. The sensed voltages from the first phase and the second phase are combined to obtain a summed voltage and remove the Hall effect sensor and amplifier offset error value. In one arrangement, the summed voltage corresponds to the sensed Hall voltage of the first Hall effect sensor added to the Hall voltage of the second Hall effect sensor. In another arrangement, the summed voltage corresponds to the sensed Hall voltage of the first Hall effect sensor subtracted by the sensed Hall voltage of the second Hall effect sensor. Changes in the summed voltage with respect to a reference voltage are counted to determine the speed of a rotating shaft having magnets or a similar arrangement.

Description

Background technique [0001] The present invention relates to a Hall effect sensor circuit arrangement comprising a Hall effect sensor providing offset compensation. [0002] The use of Hall effect sensors to detect magnetic fields is known. The circuit alternatively samples the terminals of the Hall effect sensor at 0 degree and 90 degree orientations. Such a technique is called galvanic spinning. In an attempt to reduce offset voltage errors that may be caused by factors such as mechanical stress, temperature changes, or manufacturing misalignments, cross-shaped Hall effect sensors are utilized. However, a low-pass filter is required to remove the voltage ripple representing offset error from the output of the Hall effect sensor. Therefore, the response speed is limited by the low-pass filter. Contents of the invention [0003] In one embodiment, the present invention provides a method for sensing a magnetic field using at least one Hall-effect sensor connected to a Hal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/07H10N52/00
CPCG01R33/075G01R33/0029
Inventor 王磊A·J·桑托斯M·E·拉克洛瓦
Owner THE TIMKEN CO