Frequency signal isolator

Abstract

The invention discloses a frequency signal isolator. The frequency signal isolator comprises a shell and a circuit board mounted in the shell, wherein two groups of wire-pressing terminals are arranged at the upper and lower ends of the right side of the shell; a guiding rail type clamping groove is formed in the left side of the shell; signal cable plug-wire holes are formed in the top and bottom of the shell; six signal terminals are mounted on the front side, close to the bottom, of the shell; and the signal terminals are connected with signal lines. The frequency signal isolator is small in size, attractive in appearance, convenient to detach and install, suitable for intensive installation and adopts a standard guiding rail type installation mode; and in addition, input, output and a power supply are all isolated, so that the frequency signal isolator has relatively high anti-interference capability.

Description

Technical field [0001] The invention relates to a signal isolator, in particular to a frequency signal isolator, and belongs to the technical field of electrical equipment. Background technique [0002] Realization of monitoring and control in the industrial production process requires the use of various automation instruments, control systems and actuators. The signal transmission between them includes small signals ranging from faint to millivolts and milliamps, as well as tens of volts. Large signals of thousands of volts and hundreds of amperes, including low-frequency DC signals, high-frequency pulse signals, etc., after forming the system, it is often found that the transmission between the instrument and the equipment interferes with each other, resulting in system instability or even misoperation. A signal isolator is required. The signal isolator is to input single or dual current or voltage signals, and transmit and output isolated single or dual linear current or volta...

AI Technical Summary

Problems solved by technology

[0002] Realizing monitoring and control in the industrial production process requires the use of various automation instruments, control systems and actuators. The signal transmission between them ranges from weak to millivolt-level, milliamp-level small signals, and tens of volts. Large signals of thousands of volts and hundreds of amperes, including low-frequency DC signals and high-frequency pulse signals, etc., after forming a system, it is often found that the transmission between the instrument and the equipment interferes with each other, causing system instability or even misoperation. A signal isolator is needed. The signal isolator is to input a single or dual current or voltage signal, and transmit and output an isolated single or dual linear current or voltage signal, and to improve the connection between input, output and power supply. Electrical isolation performance. Signals will encounter various interferences during transmission. To ensure signal stability, it is particularly important to use a signal isolator. Its working principle is: first, the signal received by the PLC is modulated and transformed by a semiconductor device, and then Isolate and convert through optical or magnetic sensing devices, and then demodulate and transform back to the original signal or different signals before isolation. At the same time, isolate the power supply of the isolated signal to ensure that the transformed signal, power supply, and ground are absolutely independent. ; Existing signal isolators cannot completely isolate the input, output and power supply of the signal, resulting in a decrease in anti-interference ability, and the interference still exists

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