US 10,884,037 B2Granted

Angular resolver imbalance detection

AssigneeTexas Instruments Incorporated

InventorsShanmuganand Chellamuthu, Qunying Li, Sri Navaneethakrishnan Easwaran

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Abstract

An angular resolver system includes, for example, an imbalance detector for detecting degraded resolver output signals. The imbalance detector includes a first and second power averaging circuits and a comparator circuit. The first power averaging circuit includes a first integrator for generating over a first time window a first average power signal in response to resolver sensor output signals. The second power averaging circuit includes a second integrator for generating over a second time window a second average power signal in response to the resolver sensor output signals, where the first time window is longer than the second time window. The comparator circuit compares the first average power signal and the second average power signal and generates a fault signal when the first average power signal and the second average power signal differ by a selected voltage threshold.

Claims15

Dependent claims

A detection circuit, comprising:

(a) a first averaging circuit having first sensor inputs and a first average output, the first averaging circuit including a first capacitor coupled to the first average output and having a first capacitance;
(b) a second averaging circuit having second sensor inputs coupled to the first sensor inputs and having a second average output, the second averaging circuit including a second capacitor coupled to the second average output and having a second capacitance different than the first capacitance;
and
(c) a comparator circuit having a first input coupled to the first average output, a second input coupled to the second average output, and having a fault signal output, the comparator circuit including:
(i) a threshold circuit having an input coupled to the average output, a first threshold output, and a second threshold output;
(ii) a first comparator having an input coupled to the first threshold output, having another input coupled to the first average output, and having a first comparator output;
(iii) a second comparator having an input coupled to the second threshold output, having another input coupled to the second average output, and having a second comparator output;
and
(iv) a logic gate having an input coupled to the first comparator output, having another input coupled to the second comparator output, and having the fault signal output.

6 more elements

A detection circuit, comprising:

(a) a sensor adapted to be coupled to a rotatable shaft and providing first and second sensor outputs;
(b) a first averaging circuit having first sensor inputs coupled to the first and second sensor outputs and having a first average output, the first averaging circuit including:
(i) first and second squaring circuits coupled to the first sensor inputs and having respective first and second squaring outputs;
(ii) a first summing circuit having inputs coupled to the first and second squaring outputs and having a first summing output;
and
(iii) a first capacitor, having a first capacitance, coupled to the first summing output and to the first average output;
(b) a second averaging circuit having second sensor inputs coupled to the first and second sensor outputs and having a second average output, the second averaging circuit including:
(i) third and fourth squaring circuits coupled to the second sensor inputs and having respective third and fourth squaring outputs;
(ii) a second summing circuit having inputs coupled to the third and fourth squaring outputs and having a second summing output;
and
(iii) a second capacitor, having a second capacitance different than the first capacitance, coupled to the second summing output and to the second average output;
and
(c) a comparator circuit having inputs coupled to the first summing circuit output, to the second summing circuit output, and to a threshold input and having a fault output.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/263,114Filed 12 Sep 2016
Published: US 2018/0073895 A115 Mar 2018
Granted: 5 Jan 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

G01R 19/2513
Using digital measurement techniques: arrangements for monitoring electric power systems, e.g. power lines or loads; Logging
G01D 3/08
Indicating or recording apparatus with provision for the special purposes referred to in the subgroups: with provision for safeguarding the…
G01D 5/2073
By influencing the mutual induction between two or more coils: by movement of a single coil with respect to two or more coils
G01D 5/208
By movement of a single coil with respect to two or more coils: using polyphase currents