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Symmetric and asymmetric isolation type driving signal transmission circuit

A technology for driving signals and transmitting circuits, applied in the direction of logic circuit connection/interface layout, etc., can solve problems such as low-voltage domain interference and damage to low-voltage domain devices, and achieve the effects of improving robustness, avoiding changes, and reducing the difficulty of circuit design

Pending Publication Date: 2020-07-28
厦门芯达茂微电子有限公司
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  • Abstract
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Problems solved by technology

It can also be said to isolate two different voltage domains. For example, in a control system, the processor power supply is usually a low-voltage 5V, and the load power supply is usually a high-voltage 220V. If the two voltage domains are not isolated, the operation of the high-voltage domain will affect the low-voltage domain. Cause serious interference and even damage devices in the low-voltage domain

Method used

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  • Symmetric and asymmetric isolation type driving signal transmission circuit
  • Symmetric and asymmetric isolation type driving signal transmission circuit
  • Symmetric and asymmetric isolation type driving signal transmission circuit

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Embodiment Construction

[0031] The technical solutions of the present invention will be further described below with reference to the drawings and specific embodiments.

[0032] refer to Figure 1-Figure 7 , a symmetrical and asymmetrical isolated drive signal transmission circuit, comprising: an input line, an isolator, and an output line; the isolator isolates the power supply and ground of the output line from the power supply and ground of the output circuit;

[0033] According to the level of the input signal, the input line generates a symmetrical or asymmetrical modulation signal to the isolation medium after voltage-to-carrier modulation; the output line receives the modulated signal through the isolation medium, and generates it after carrier-to-voltage demodulation output signal.

[0034] In this embodiment, when the modulation signal is a symmetrical carrier signal, the output signal generated after carrier-to-voltage demodulation is high level; when the modulation signal is an asymmetric...

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Abstract

The invention provides a symmetric and asymmetric isolation type driving signal transmission circuit. The symmetric and asymmetric isolation type driving signal transmission circuit comprises an inputcircuit, an isolator and an output circuit, the isolator isolates the power supply and the ground of the output circuit from the power supply and the ground of the output circuit; the input line generates symmetric or asymmetric modulation signals to the isolation medium after voltage transference wave modulation according to the level condition of input signals. The output line receives the modulation signal passing through the isolation medium, and generates an output signal after carrier-to-voltage demodulation. According to the symmetric and asymmetric isolation type driving signal transmission circuit, compared with conventional 2FSK modulation, the input line part is modulated by voltage transference waves, the requirement for carrier signals is low, modulation and demodulation of driving signals are not affected when carrier frequency and asymmetry fluctuation is not large, the circuit design difficulty is lowered, and the product robustness is improved.

Description

technical field [0001] The invention relates to an isolation circuit, in particular to an isolation driving signal transmission circuit. Background technique [0002] The main function of isolation is to separate one line from another line to avoid interference, such as using an insulator (dielectric) to separate the two lines. It can also be said to isolate two different voltage domains. For example, in a control system, the processor power supply is usually a low-voltage 5V, and the load power supply is usually a high-voltage 220V. If the two voltage domains are not isolated, the operation of the high-voltage domain will affect the low-voltage domain. Cause serious interference, and even damage devices in the low-voltage domain. If digital signals can be transmitted while being isolated, it is usually through a high-frequency carrier. Such media that can both isolate high voltage and transmit signals include inductors, transformers, optocouplers, capacitors, NVE magnetic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/0175
CPCH03K19/0175
Inventor 李河清王燕晖黄鑫
Owner 厦门芯达茂微电子有限公司
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