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Isolation amplifier

A technology of isolation amplifier and optocoupler device, applied in the direction of DC isolation amplifier, amplifier, amplifier type, etc., to achieve the effect of improving the linear relationship

Inactive Publication Date: 2019-07-09
NTN CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, optocouplers alone cannot be used in applications that require a high linear relationship between the input signal and the output signal

Method used

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  • Isolation amplifier
  • Isolation amplifier
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Embodiment Construction

[0020] Below, while referring to the attached Figure 1 The isolation amplifier according to the embodiment of the present invention will be described in detail. In addition, in the description of the embodiment figure 1 and figure 2 In , the same symbols are assigned to common structural elements, and repeated descriptions are omitted.

[0021] figure 1 An example of the configuration of the isolation amplifier 1 according to the embodiment of the present invention is shown.

[0022] The isolation amplifier 1 has a photocoupler P1 as a first photocoupling element, a photocoupler P2 as a second photocoupling element, a resistor R1, and a resistor R2.

[0023] The photocoupler P1 includes a light emitting diode D1 as a light emitting element, and a phototransistor Q1 as a light receiving element. Similarly, the photocoupler P2 includes a light emitting diode D2 as a light emitting element, and a phototransistor Q2 as a light receiving element. The characteristics of the ...

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Abstract

In order to improve linearity of an input signal and an output signal without using an amplifier, a current Iin is divided into a current I1 and a current I2. When the current I1 passes through a light emitting diode D1, the light-emitting diode D1 emits light, and a current path of a phototransistor Q1 conducts. At that time, the current Iout passes through the light emitting diode D2, and the light-emitting diode D2 emits light. When the light emitting diode D2 emits light, the current path of a phototransistor Q2 conducts, and the current I2 flows. For example, if the current Iout is too large, then the emission intensity of the light-emitting diode D2 becomes too great. At that time, a large current I2 passes through the phototransistor Q2. For that reason, the current I1 flowing in the light emitting diode D1 decreases. By this means, the light emission intensity of the light-emitting diode D1 becomes smaller, so the current Iout decreases. In this way, the photocoupler P2 functions as a negative feedback circuit, so the linearity of current Iin and the current Iout increases.

Description

technical field [0001] The invention relates to an isolation amplifier with electrical insulation between input end and output end. Background technique [0002] In the case of an optocoupler, although the input and output are electrically isolated, it is also possible to transmit a signal between the input and output. However, in a photocoupler, the input signal and the output signal are generally not in a proportional relationship. For example, even when the input signal changes linearly, the output signal does not change linearly. This is not a problem when optocouplers are used as switching elements. However, optocouplers alone cannot be used in applications that require a high linear relationship between input and output signals. [0003] Therefore, Patent Document 1 discloses an isolation amplifier (isolation amplifier) ​​that uses two photocouplers and a negative feedback amplifier to improve the linear relationship between an input signal and an output signal. In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/12
CPCH01L31/12H03F3/50H03F1/34H03F3/085H03F2200/276G01J1/44G01J2001/4413G01J2001/4473
Inventor 羽田正二
Owner NTN CORP
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