A package structure for improving the strength of an optical coupling CTR

Abstract

The utility model relates to a light coupling technical field especially relates to a kind of packaging structure of promotion light coupling CTR intensity;Through ingenious reconfiguration input pin component layout, the original positive / negative pin function is interchanged, and higher luminous efficiency reverse LED is used, while realizing CTR promotion, the high cost of redesigning chip architecture, adjusting material lamination or customizing special support in traditional scheme is avoided, and the demand of customer to high CTR light coupling can be quickly responded, and development cycle and production cost are greatly compressed, by strictly limiting the symmetry distribution principle of anode pin and collector pin, cathode pin and emitter pin, and the design of LED base island about horizontal symmetry line symmetry, it is ensured that the packaging structure after improvement is completely identical with original light coupling pin physical position, this design makes the present scheme can directly seamlessly replace the traditional light coupling on existing circuit board, and solves the technical problem that the existing light coupling CTR promotion is accompanied by a large amount of cost input.

Description

Technical Field

[0001] This utility model relates to the field of optocoupler technology, and in particular to a packaging structure for improving the CTR strength of optocouplers. Background Technology

[0002] With the widespread application and continuous development of optocouplers in the electronics field, customers have increasingly stringent requirements for the stability of their signal transmission. Especially in key scenarios such as industrial automation and communication systems, signal stability is directly related to the reliability and performance of equipment. An important core factor that determines the signal stability of optocouplers is the optocoupler transfer efficiency (CTR), which is the ratio between the input current and the output current. This indicator directly affects the degree of signal attenuation and distortion.

[0003] If manufacturers need to improve the CTR of different types of optocouplers according to the specific needs of customers, such as by optimizing the current transmission path or improving the photoelectric conversion efficiency, they usually have to redesign the internal structure of the optocoupler, including key elements such as chip layout, material stacking and interface configuration. This process is often accompanied by adjustments to the production process, changes in raw material specifications and updates or replacements of dedicated production equipment, involving large-scale technological transformation and resource investment, which leads to extended R&D cycles, significantly increased production costs, and ultimately push up the overall price and market competitiveness of the product. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a packaging structure that enhances the CTR of optocouplers, solving the technical problem that improving the CTR of optocouplers is accompanied by significant cost investment.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a packaging structure for improving the CTR strength of an optocoupler, comprising a package body, wherein the package body is provided with an input pin assembly for converting an electrical signal into an optical signal, and an output pin assembly for receiving the optical signal transmitted by the input pin assembly and outputting an electrical signal. The input pin assembly includes a positive pin connected to the positive terminal of a power supply and a negative pin connected to the negative terminal of a power supply. A reverse LED is mounted on the positive pin, the positive terminal of the reverse LED is connected to the positive pin, and the negative terminal of the reverse LED is connected to the negative pin through a wire.

[0006] Preferably, the output pin assembly includes a collector pin and an emitter pin disposed on the package. A photosensitive element for receiving light emitted by the reverse LED and converting it into electrical energy is connected to the collector pin, and another pin of the photosensitive element is connected to the emitter pin.

[0007] Preferably, the positive electrode pin and the collector pin are symmetrically distributed at both ends of the package, and the negative electrode pin and the emitter pin are symmetrically distributed at both ends of the package.

[0008] Preferably, the positive pin is provided with an LED base island for mounting a reverse LED, and the LED base island can cover the mounting area of ​​the reverse LED from both the front and back sides with respect to the horizontal symmetry line of the package.

[0009] Preferably, the line connecting the position of the photosensitive element and the reverse LED is parallel to the horizontal center line of the package.

[0010] Preferably, the package is provided with identifiers for indicating how the positive and negative pins are connected to the positive and negative terminals of the power supply.

[0011] By employing the above technical solution, this utility model provides a packaging structure that enhances the CTR strength of an optocoupler, and has at least the following beneficial effects: 1. This utility model cleverly reconstructs the layout of the input pin assembly, interchanges the functions of the original positive and negative pins, and adopts a reverse LED with higher luminous efficiency. While improving CTR, it avoids the high costs of redesigning the chip architecture, adjusting the material stack-up, or customizing a special bracket in traditional solutions. It can also quickly respond to customers' needs for high CTR optocouplers, significantly reduce the R&D cycle and production costs, and enhance the product's market competitiveness.

[0012] 2. This utility model ensures that the improved packaging structure is completely consistent with the physical position of the original optocoupler pins by strictly limiting the symmetrical distribution principle of the positive electrode pin and the collector pin, the negative electrode pin and the emitter pin, and the symmetrical design of the LED base island about the horizontal symmetry line. This design allows this solution to directly and seamlessly replace the traditional optocoupler on the existing circuit board. Attached Figure Description

[0013] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of an optical coupler in the prior art; Figure 2 This is a schematic diagram of the optical coupler of this utility model.

[0014] In the diagram: 1. Package; 2. Input pin assembly; 21. Positive pin; 22. Negative pin; 23. Inverting LED; 24. LED base island; 3. Output pin assembly; 31. Collector pin; 32. Emitter pin; 33. Photosensitive element; 4. Identifier. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] like Figure 1 As shown, the existing optocoupler structure has a low CTR. To address the technical problem that improving the CTR of existing optocouplers requires significant cost, this invention provides a packaging structure to improve the CTR of optocouplers, thereby reducing the modification cost for improving the CTR of optocouplers. Figure 2 As shown, the package 1 is provided with an input pin assembly 2 for converting electrical signals into optical signals, and an output pin assembly 3 for receiving optical signals transmitted by the input pin assembly 2 and outputting electrical signals. The input pin assembly 2 includes a positive pin 21 connected to the positive terminal of the power supply and a negative pin 22 connected to the negative terminal of the power supply. A reverse LED 23 is mounted on the positive pin 21. The positive terminal of the reverse LED 23 is connected to the positive pin 21, and the negative terminal of the reverse LED 23 is connected to the negative pin 22 by a wire. By comparison... Figure 1 and Figure 2 It can be found that the methods to improve CTR are: 1. Figure 1 The original positive pin 21 and negative pin 22 were respectively used as Figure 2 The negative pin 22 and positive pin 21 are used in the optical coupler; 2. Replace the positive LED with a reverse LED with higher luminous intensity to improve the CTR. This can save the mold opening cost of the optical coupler bracket, and the optical coupler bracket in the existing technology can be used directly. The cost of replacing the LED is almost negligible, thereby achieving the purpose of improving the CTR of the optical coupler.

[0017] The structure of the pin assembly 3 is described in detail below. The output pin assembly 3 includes a collector pin 31 and an emitter pin 32 disposed on the package 1. A photosensitive element 33 is connected to the collector pin 31 for receiving light emitted by the reverse LED 23 and converting it into electrical energy. The other pin of the photosensitive element 33 is connected to the emitter pin 32.

[0018] To ensure that the positions of the pins of the improved optocoupler remain unchanged, so that it can be directly applied to products using existing optocouplers, the positions of the positive pin 21 and the collector pin 31 are symmetrically distributed at both ends of the package 1, and the positions of the negative pin 22 and the emitter pin 32 are symmetrically distributed at both ends of the package 1.

[0019] If the position of the LED base island 24 changes during the repositioning of the positive pin 21, it may lead to changes in processes such as soldering. In order to reduce process changes, an LED base island 24 for mounting the reverse LED 23 is provided on the positive pin 21. The LED base island 24 can cover the mounting area of ​​the reverse LED 23 both before and after being symmetrical about the horizontal symmetry line of the package body 1. When performing CTR upgrade modification, optocouplers that can cover the mounting area of ​​the reverse LED 23 both before and after being symmetrical about the horizontal symmetry line of the package body 1 can be given priority for CTR upgrade modification, so as to greatly reduce costs.

[0020] To ensure that the optical path and the position of internal components do not need to be adjusted before and after the improvement, the line connecting the position of the photosensitive element 33 and the reverse LED 23 is parallel to the horizontal center line of the package 1. This ensures that the installation position of the photosensitive element 33 and the LED remains unchanged before and after the improvement. Therefore, this type of optocoupler can be given priority when upgrading the CTR.

[0021] To ensure that users do not reverse the positive and negative terminals when using the optocoupler, the package 1 is provided with identifiers to indicate the connection method of the positive pin 21 and the negative pin 22 to the positive and negative terminals of the power supply, indicating which pin of the optocoupler is connected to the positive terminal and which pin is connected to the negative terminal.

[0022] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A packaging structure for improving the CTR strength of an optocoupler, comprising a package body (1), wherein the package body (1) is provided with an input pin assembly (2) for converting an electrical signal into an optical signal, and an output pin assembly (3) for receiving the optical signal transmitted by the input pin assembly (2) and outputting an electrical signal, characterized in that, The input pin assembly (2) includes a positive pin (21) connected to the positive terminal of the power supply and a negative pin (22) connected to the negative terminal of the power supply. A reverse LED (23) is mounted on the positive pin (21). The positive terminal of the reverse LED (23) is connected to the positive pin (21), and the negative terminal of the reverse LED (23) is connected to the negative pin (22) by a wire.

2. The packaging structure for enhancing the CTR intensity of an optocoupler according to claim 1, characterized in that, The output pin assembly (3) includes a collector pin (31) and an emitter pin (32) disposed on the package (1). A photosensitive element (33) for receiving light emitted by the reverse LED (23) and converting it into electrical energy is connected to the collector pin (31). Another pin of the photosensitive element (33) is connected to the emitter pin (32).

3. The packaging structure for enhancing the CTR intensity of an optocoupler according to claim 1, characterized in that, The positive electrode pin (21) and collector pin (31) are symmetrically distributed at both ends of the package (1), and the negative electrode pin (22) and emitter pin (32) are symmetrically distributed at both ends of the package (1).

4. The packaging structure for enhancing the CTR intensity of an optocoupler according to claim 1, characterized in that, The positive pin (21) is provided with an LED base island (24) for mounting the reverse LED (23). The LED base island (24) is symmetrical about the horizontal symmetry line of the package (1) and can cover the mounting area of ​​the reverse LED (23) from both the front and back.

5. The packaging structure for enhancing the CTR intensity of an optocoupler according to claim 2, characterized in that, The line connecting the positions of the photosensitive element (33) and the reverse LED (23) is parallel to the horizontal center line of the package (1).

6. The packaging structure for enhancing the CTR intensity of an optocoupler according to claim 1, characterized in that, The package (1) is provided with an identifier (4) for indicating the connection method of the positive pin (21) and the negative pin (22) to the positive and negative terminals of the power supply.

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