Voltage and current compatible speed signal acquisition circuit

Abstract

The invention provides a voltage and current compatible speed signal acquisition circuit, which belongs to the field of electronics. The speed signal acquisition circuit includes speed sensor sampling loops of voltage and current signal types. The speed sensor sampling loop for voltage signals includes resistors R1, R2, R9 and transistor VT1; the speed sensor sampling loop for current signals includes resistors R3, R4, and R5. , R6, R7, R8, R10, R11 and transistors VT2, VT3 and VT4; resistors R7, R8, R9 and R10 constitute a voltage divider circuit for speed signals; resistors R7, R8 and transistor VT4 constitute an overcurrent protection circuit. The present invention utilizes two types of speed sensors of voltage and current to provide a speed signal acquisition circuit compatible with voltage type and current type, which significantly improves the flexibility and operability of the system, enhances reliability, and has high practicality. value.

Description

technical field [0001] The invention relates to a speed signal acquisition circuit, in particular to a voltage and current compatible speed signal acquisition circuit, which belongs to the field of electronics. Background technique [0002] The train operation monitoring and recording device (hereinafter referred to as the monitoring device) is an important security equipment for locomotive operation. The speed information is the basic information necessary for the control of the monitoring device, and the speed signal acquisition circuit is the key to the monitoring device. It plays an important role in the monitoring device system. The accuracy and reliability of its speed signal acquisition directly affect the performance of the monitoring device system. [0003] In the past, the speed signal was obtained by first obtaining the code value through the photoelectric encoder, resolver or electromagnetic encoder, and then calculating the speed signal through the processor, or...

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Problems solved by technology

[0003] In the past, the speed signal was obtained by first obtaining the code value through the photoelectric encoder, resolver or electromagnetic encoder, and then calculating the speed signal through the processor, or directly collecting it through the speed sensor, such as the speed signal acquisition circuit based on the Hall speed sensor. However, the above speed signal acquisition devices are either large in size, complex in structure, and high in cost, or the acquisition method is unstable and low in reliability. Therefore, it is necessary to develop a speed signal acquisition circuit with high reliability, simple operation, and low cost.

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