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Signal transmitting circuit of analog optocoupler

A signal transmission and circuit technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problems of slow transmission of optocouplers, affecting the delay and accuracy of output signals, and poor common-mode rejection ratio of optocouplers. The effect of improving delay and improving accuracy

Pending Publication Date: 2021-06-01
SUZHOU NOVOSENSE MICROELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the optocoupler has light decay during signal transmission, and the current conversion ratio will change with time and temperature, thus affecting the delay and accuracy of the output signal
In addition, the optocoupler transmission is relatively slow, not suitable for high-speed systems
Moreover, the common mode rejection ratio of the optocoupler is poor, and it is easy to generate wrong pulses

Method used

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  • Signal transmitting circuit of analog optocoupler
  • Signal transmitting circuit of analog optocoupler
  • Signal transmitting circuit of analog optocoupler

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Embodiment Construction

[0021] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described The embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0022] Such as Figure 1 to Figure 2 As shown, a signal transmission circuit of an analog optocoupler is provided. The signal transmission circuit includes a reverse voltage protection module 1, a voltage clamp module 2 and an isolation transmission module 3 connected in sequence. The reverse voltage protection module 1 is connected to ...

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Abstract

The invention provides a signal sending circuit of an analog optocoupler, the signal sending circuit comprises a back voltage protection module, a voltage clamping module and an isolation transmission module which are connected in sequence, and the back voltage protection module is communicated with the positive electrode of a power supply so as to transmit a current signal to the voltage clamping module; the voltage clamping module comprises a positive temperature coefficient branch and a negative temperature coefficient branch which are connected in series, and the output voltage of the voltage clamping module is the sum of the positive temperature coefficient voltage at the two ends of the positive temperature coefficient branch and the negative temperature coefficient voltage at the two ends of the negative temperature coefficient branch. The back voltage protection module is arranged firstly to prevent the voltage of the power supply cathode from being higher than that of the power supply anode, which is equivalent to simulating the reverse bias cut-off characteristic of the optocoupler. Moreover, by adjusting parameters in the positive temperature coefficient branch and the negative temperature coefficient branch, the output voltage of the voltage clamping module can be close to the zero temperature coefficient, so that precision and delay of the output voltage are improved.

Description

technical field [0001] The invention relates to the field of isolation driving chips, in particular to a signal sending circuit of an analog optocoupler. Background technique [0002] In the prior art, an optocoupler can be used for signal transmission during signal transmission. For example, when the current flows from the anode to the cathode, the LED light of the optocoupler can be made to emit light, so that the phototransistor on the other side of the optocoupler can receive the light signal. , so as to realize the isolation and transmission of the signal on the left side to the right side. [0003] However, the optocoupler has light decay during signal transmission, and the current conversion ratio will change with time and temperature, thus affecting the delay and accuracy of the output signal. In addition, optocoupler transmission is relatively slow, not suitable for high-speed systems. Moreover, the common-mode rejection ratio of the optocoupler is poor, and it is...

Claims

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Application Information

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IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 龚晓寒盛云
Owner SUZHOU NOVOSENSE MICROELECTRONICS
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