Signal detection circuit and apparatus thereof

Abstract

The invention provides a signal detection circuit and an apparatus thereof. According to an actual detection need, the number of detection branch circuits included by the signal detection circuit is determined. Each detection branch circuit comprises a differential signal receiver. A first input terminal of one end differential signal receiver is connected to a pull-up resistor and a first resistor. The other end of the pull-up resistor is grounded. A second input terminal of the one end differential signal receiver is connected to a pull-down resistor and a second resistor. The other end of the pull-down resistor is connected to a first power supply. The second resistor and the first resistor are connected through a third resistor so as to form an asymmetric resistor network. Under the condition that an absolute value of a voltage difference of the first input terminal and the second input terminal of the differential signal receiver is greater than a preset amplitude limiting voltage, each resistance value and a first power supply voltage value are adjusted so that the circuit and the apparatus can be simultaneously suitable for occasions of a differential output type encoder, a collector open circuit output type encoder and a push-pull output type encoder; an actual need is satisfied and a detection process of each type of encoder is simplified.

Description

technical field [0001] This application mainly relates to the application field of encoders, and more specifically relates to a signal detection circuit and device. Background technique [0002] An encoder is a device that compiles and converts signals or data into signal forms that can be used for communication, transmission and storage. In the practical application of the inverter industry, the output forms of the encoder usually include differential output, open-collector output, and push-pull output, etc. The output signal is detected to obtain the signal required for speed measurement, phase judgment or positioning. [0003] In this regard, in the prior art, a specific signal detection circuit is usually used to detect a corresponding output encoder, such as using a differential chip to detect the output signal of a differential output encoder. The signal detection circuit of an encoder with one output form is usually not suitable for encoders with other output forms,...

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Problems solved by technology

[0003] In this regard, in the prior art, a specific signal detection circuit is usually used to detect a corresponding output encoder, such as using a differential chip to detect the output signal of a differential output encoder. The signal detection circuit of an encoder with one output form is usually not suitable for encoders with other output forms, resulting in the actual detection process requiring signal detection circuits with various structures, which is very inconvenient to operate

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