Linear optocoupler transmitting analog signal circuit

Abstract

The invention provides a linear optocoupler transmitting analog signal circuit. The linear optocoupler transmitting analog signal circuit comprises a linear optocoupler 01, a first operational amplifier U1, a second operational amplifier U2, a first resistor R1, a second resistor R2 and a third resistor R3, wherein the linear optocoupler 01 comprises an LED (Light Emitting Diode), a first photodiode PD1 and a second photodiode PD2 which are matched with the LED. The linear optocoupler transmitting analog signal circuit provided by the invention has the advantages that the problem of nonlinearity of a photoelectric coupler and the problem of poor accuracy when an analog signal is directly transmitted can be solved, and the influence on the photoelectric coupler caused by temperature change can be well overcome; the circuit is simple, and the reliability is high.

Description

technical field [0001] The invention relates to an analog signal transmission circuit, in particular to a linear optocoupler transmission analog signal circuit. Background technique [0002] With the development of industry, the voltage level of the system is getting higher and higher, requiring the main circuit to be isolated from the control system, and the detection of the analog signal of the main circuit also requires isolation. The control system measures the analog quantity of the main circuit by using the input and output isolation of the linear photocoupler. [0003] Existing analog signal isolation generally uses the following methods: [0004] 1. The transformer is used for transmission, which can transmit AC signals, but cannot transmit DC signals; [0005] 2. Optical fiber transmission, which converts electrical signals into optical signals through voltage / frequency conversion, transmits them through optical fibers, and converts optical signals into electrical...

AI Technical Summary

Problems solved by technology

[0005] 2. Optical fiber transmission, which converts electrical signals into optical signals through voltage / frequency conversion, transmits them through optical fibers, and converts optical signals into electrical signals through frequency / voltage conversion on the receiving side to realize analog signal measurement, which is too costly;

[0006] 3. Hall sensor, disadvantages: high cost, large size, multi-channel power supply required

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