High-precision linear photoelectric coupler structure
An optocoupler and high-precision technology, applied in the field of optocouplers, can solve problems such as cost waste, unguaranteed yield, random temperature drift characteristics, etc., and achieve the effects of reducing waste costs, stabilizing transfer gain, and eliminating coupling processes
Active Publication Date: 2021-01-26
THE 44TH INST OF CHINA ELECTRONICS TECH GROUP CORP
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Problems solved by technology
[0005] 1. The transfer gain of the existing linear optocoupler is guaranteed by the coupling process, and the production efficiency is low
[0006] 2. There is no effective debugging method in the production process of existing linear optocouplers. As a result, when there are requirements for high precision and temperature drift characteristics, the manufacturer can only select products that meet the requirements through selection methods, resulting in huge cost waste and finished products. rate cannot be guaranteed
[0007] 3. Under the existing structural design, the input / output roles of photodiodes are fixed, and the temperature drift characteristics are random, which cannot guarantee the fixed temperature drift direction characteristics. This characteristic increases the difficulty of temperature characteristic compensation for the user
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[0027] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, and to make the above-mentioned purposes, features and advantages of the embodiments of the present invention more obvious and understandable, the following describes the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings For further detailed explanation.
[0028] In the description of the present invention, unless otherwise specified and limited, it should be noted that the term "connection" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be Directly connected or indirectly connected through an intermediary, those skilled in the art can understand the specific meanings of the above terms according to specific situations.
[0029] Such as figure 1 As ...
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The present invention discloses a high-precision linear photoelectric coupler structure which comprises a shell, a cavity is formed in the shell, a groove is formed in the cavity wall of the bottom ofthe cavity, and a light emitting diode chip is fixedly arranged at the bottom of the groove; a positioning column is fixedly arranged on the cavity wall of the bottom of the cavity, an inner ceramicchip is fixedly arranged at a groove opening of the groove, and the inner ceramic chip abuts against the positioning column to be positioned; and two photodiode chips are fixedly arranged on the end face, facing the light emitting diode chip, of the inner ceramic chip. According to the invention, by fixing the relative positions of the light emitting diode chip and the two photodiode chips, stabletransmission gain can be obtained, so that a complex coupling process is omitted; the two photodiode chips are fixed on the ceramic chip, and only the ceramic chip and the photodiode chips need to bereplaced when the nonlinearity does not meet the requirement, so that the waste cost of the device is greatly reduced.
Description
technical field [0001] The invention relates to the field of optocouplers, in particular to a high-precision linear optocoupler structure. Background technique [0002] In modern electronic monitoring systems, it is necessary to isolate and detect various forms of analog quantities such as power supply voltage, motor speed, operating angle, and height. Building an analog signal detection circuit around a linear optocoupler is one of the most common solutions. [0003] The linear optocoupler is internally composed of a light-emitting diode chip and two photodiode chips. The input stage consists of a light-emitting diode chip and one of the photodiode chips, usually together with an operational amplifier chip to form a negative feedback servo circuit to convert electrical signals into photocurrent signals. The other photodiode chip uses the proportional symmetrical structure of the linear optocoupler to transmit the photocurrent signal to the subsequent stage, and then resto...
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IPC IPC(8): H01L23/04H01L25/16
CPCH01L23/041H01L25/167
Inventor 张佳宁张广涵龚磊胡锐兴蒋利群李彦良
Owner THE 44TH INST OF CHINA ELECTRONICS TECH GROUP CORP