US 11,353,483 B2Granted

Sensor with compensation circuit

AssigneeHycon Technology Corp.

InventorsPo-Yin Chao, Hung-Wei Chen, Shui-Chu Lee

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Abstract

Disclosed is a sensor with compensation circuit for compensating offset by use of a switching circuit. The sensor has two operation modes for generating two output voltages, respectively. Offset is compensated by adding the two output voltages, and magnitude of the offset is calculated by subtracting the two output voltages. A noise threshold is set for checking if the circuit is affected by interference. When the circuit is affected by interference, the adding result of the two output voltages will be larger than the noise threshold, the output data will be hold and not updated, then a reminding signal will be issued to show that the circuit is affected by interference, and the output data flickers on a display unit when the adding result of the two output voltages is larger than the noise threshold for showing the circuit is affected by interference.

Claims24

Dependent claims

A sensor with compensation circuit, comprising:

a sensor, including a first input, a second input, a first output and a second output;
a first switch, connected between a first power source and the first input;
a second switch, connected between the first power source and the second input;
a third switch, connected between a second power source and the first input;
a fourth switch, connected between the second power source and the second input;
and
an amplifier, having a positive amplifier input and a negative amplifier input, separately connected to the first output and the second output, wherein the voltage of an amplifier output is generated according to the voltage difference between the positive amplifier input and the negative amplifier input and multiplied by a gain,
wherein a control method for the switches comprising:
a first operation mode, conducting the first switch and the fourth switch, turning off the second switch and the third switch, thereby connecting the first power source to the first input and connecting the second power source to the second input;
and
a second operation mode, conducting the second switch and the third switch, turning off the first switch and the fourth switch, thereby connecting the first power source to the second input and connecting the second power source to the first input;
subtracting the voltages generated at the amplifier output during the first operation mode and the second operation mode to eliminate offset of the amplifier.

9 more elements

A sensor with compensation circuit, comprising:

a sensor, having a first input, a second input, a first output and a second output, wherein the first input is connected to a first power source and the second input is connected to a second power source;
an amplifier, having a positive amplifier input, a negative amplifier input, and an amplifier output, the voltage of the amplifier output is generated according to the voltage difference between the positive amplifier input and the negative amplifier input and multiplied by a gain;
a first switch, connected between the first output and the positive amplifier input;
a second switch, connected between the first output and the negative amplifier input;
a third switch, connected between the second output and the positive amplifier input;
and
a fourth switch, connected between the second output and the negative amplifier input,
wherein a control method for the switches comprising:
a first operation mode, conducting the first switch and the fourth switch, turning off the second switch and the third switch, thereby connecting the first output to the positive amplifier input and connecting the second output to the negative amplifier input;
and
a second operation mode, conducting the second switch and the third switch, turning off the first switch and the fourth switch, thereby connecting the first output to the negative amplifier input and connecting the second output to the positive amplifier input;
subtracting the voltages generated at the amplifier output during the first operation mode and the second operation mode to eliminate offset of the amplifier.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/357,427Filed 19 Mar 2019
Published: US 2020/0300897 A124 Sep 2020
Granted: 7 Jun 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

G01D 3/036
Mitigating undesired influences, e.g. temperature, pressure: on measuring arrangements themselves
G01R 17/12
AC or DC measuring bridges: using comparison of currents, e.g. bridges with differential current output
G01D 3/02
Indicating or recording apparatus with provision for the special purposes referred to in the subgroups: with provision for altering or correcting…
G01R 31/50
Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by…