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Isolator

A technology of isolators and MOS transistors, applied in the direction of logic circuit connection/interface layout, logic circuit interface devices, etc., can solve the problems of strong electromagnetic interference and poor anti-electromagnetic interference ability of isolators, and achieve high reliability and anti-electromagnetic interference. Good performance and small chip size

Inactive Publication Date: 2019-12-31
北京中科格励微科技有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] However, after replacing the optocoupler with a four-port isolator, the oscillator generates strong EMI throughout the circuit, resulting in poor EMI immunity of the isolator used to replace the optocoupler

Method used

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Embodiment Construction

[0027] The principles and features of the present invention will be described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0028] like figure 1 As shown, it is a schematic structural frame diagram provided for an embodiment of the isolator of the present invention. The isolator includes: a control circuit 1, and an oscillating circuit 2, a coupling transmission circuit 3, a demodulation circuit 4 and an output circuit 5 connected in sequence, and the oscillating circuit 2 is provided with a signal input terminal, a first ground terminal and a control terminal, and the output circuit 5 is provided with a signal output terminal and a second ground terminal, wherein:

[0029] The oscillating circuit 2 is used to obtain an input signal through the signal input terminal, and convert the input signal into a first oscillating signal; the c...

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Abstract

The invention discloses an isolator, and relates to the field of isolators. The circuit comprises a control circuit, and an oscillation circuit, a coupling transmission circuit, a demodulation circuitand an output circuit which are connected in sequence, the oscillation circuit is provided with a signal input end, a first grounding end and a control end, and the output circuit is provided with asignal output end and a second grounding end. The isolator provided by the invention has four ports, can be compatible with a four-port optical coupler, greatly improves the anti-electromagnetic interference performance of the isolator, and has the advantages of small chip size, low power consumption, good anti-electromagnetic interference performance and high reliability.

Description

technical field [0001] The invention relates to the field of isolators, in particular to an isolator capable of being compatible with the pins of a four-port optocoupler. Background technique [0002] In electronic equipment such as military electronic systems, aerospace equipment, and medical equipment, in order to eliminate signal noise and protect devices and users from high voltage damage, isolators are usually added to electronic equipment. [0003] Optocouplers have always been the main choice of isolators, but they have disadvantages such as easy aging, high power consumption, and short life, which limit their usage scenarios. The isolator manufactured using the integrated circuit process has more advantages in terms of power consumption, performance and reliability, and can be used to replace the optocoupler. [0004] However, after replacing the optocoupler with a four-port isolator, the oscillator generates strong EMI throughout the circuit, resulting in poor EMI ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/0175
CPCH03K19/017536
Inventor 马春宇孙瑞亭刘姗姗李金良
Owner 北京中科格励微科技有限公司
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