PCB Tech - Application of PCB Copy Board Signal Isolation Technology

Application of PCB Copy Board Signal Isolation Technology
PCB copy board signal isolation technology is to make analog or digital signal transmission without barrier between the receiving end and current connection through the transmission. This allows the difference between the ground or reference level outside the transmitting and receiving ends to be up to several thousand volts, and also prevents loop currents between different ground potentials that damage the signal.

Mainly used in:

1. The system ground is noisy and the signal is easily damaged. Isolation technology can separate the signal into another clean signal subsystem ground and power supply, so as to ensure the reliability of the isolated part of the signal, and finally meet the design requirements of the system.

2. The system voltage difference is too large. For example, in a strong current circuit, we have to isolate the operating voltage to the allowable operating range of the IC.

3. The electrical connection between the reference levels will produce a current path that is unsafe for the operator, and the current can be controlled within a safe range through isolation.

In isolation technology, it is the key for designers to choose different isolation devices according to different types of isolated signals and isolation requirements:

1. The first type of isolation device relies on the receiver and the optical transmitter to break through the barrier of isolation, mainly isolating the transceiver IC and the optocoupler, blocking the system current through light, and the capacitor can also avoid electrical interference. This type of device Suitable for digital signals.

2. The analog transformer is coupled to send and receive signals through the electromagnetic induction of the transformer. Because the transformer is difficult to make, and its parameters cannot be precisely controlled, and it is usually impossible to make an IC, it is very inconvenient to use, but the linearization problem forces the use of transformers for analog signal isolation.

3. In order to solve the inconvenient use of the transformer, engineers used a modulated carrier to make the analog signal break through this barrier, and came up with a capacitor circuit to couple the modulated signal to break through the barrier, and the high conversion rate transient voltage acting on the isolation barrier It can be used as the signal of a single-capacitor barrier device, and a dual-capacitor differential circuit has been developed to minimize the error. Now the capacitance barrier technology has been widely used in digital and analog isolation devices. At present, the country has higher and higher requirements for environmental protection and greater efforts in link governance. This is a challenge but also an opportunity for PCB factories. If PCB factories are determined to solve the problem of environmental pollution, then FPC flexible circuit board products can be at the forefront of the market, and PCB factories can get opportunities for further development.
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