Disconnection detection circuit of incremental encoder and connection circuit of incremental encoder

Abstract

The application provides a disconnection detection circuit of an incremental encoder and a connection circuit of an incremental encoder. Three detection units are respectively connected with A-phase, B-phase, and Z phase signal lines; and in each detection unit, a voltage received by a positive electrode of an input terminal is compared with a Vcp- value by a first comparison module and a voltage received by a negative electrode of the input terminal is compared with a Vcp+ value by a second comparison module. If the positive electrode of the input terminal is disconnected, the input terminal of the first comparison module receives Vee by a pull-down resistor. Because the Vcp- value is larger than the Vee, the output of the first comparison module is converted to be at a low level and thus the disconnection of the positive electrode of the input terminal of the phase signal line is represented. In a similar way, a detection result representing whether the negative electrode of the input terminal of the signal line is disconnected is obtained by the second comparison module and which phase of signal line is disconnected is detected. Moreover, disconnection detection is realized only by connection with the corresponding phase signal line and all power supplies. The disconnection detection circuit and the connection circuit can be applied to an incremental encoder of a collector open-circuit output.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a disconnection detection circuit of an incremental encoder and a connection circuit thereof. Background technique [0002] An encoder is a device that converts angular displacement or linear displacement into electrical signals. Among them, incremental encoders with low cost are widely used in the fields of motion control and electric transmission. [0003] However, the incremental encoder hardware disconnection detection circuit in the prior art is usually only suitable for incremental encoders with differential output, not for incremental encoders with open-collector output; and, the existing The hardware disconnection detection circuit in the technology can only detect which phase or phases of the A, B, and Z phase signal lines of the incremental encoder are disconnected, and cannot, for example, in the case of a phase A disconnection, It is judged that the positiv...

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Problems solved by technology

[0004] In view of this, the present invention provides a disconnection detection circuit of an incremental encoder and its connection circuit to solve the problem that the prior art cannot be applied to an incremental encoder with an open-collector output, and cannot detect the specific Which phase signal line is broken?

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