Opposite vertical type SSR optocoupler

Abstract

The invention relates to the technical field of SSR optocouplers, in particular to an opposite vertical type SSR optocoupler. The light emitting diode and the bidirectional photosensitive silicon controlled rectifier are oppositely arranged, so that light rays directly irradiate the surface of the photosensitive silicon controlled rectifier, and the problem of light intensity loss caused by the fact that the light rays need to be refracted by a lens in a traditional planar structure is solved; in addition, the output loop adopts independent layout of three output pins, the number of used conductive wires is further reduced, the cost of gold wire materials is reduced, potential quality hazards such as wire collapse and wire breakage in the wire welding process are reduced, and the reliability of the packaging structure is improved. Therefore, the production yield and the product reliability are improved; the technical problems that an existing planar SSR optocoupler is low in light transmission efficiency, prone to glue overflowing to form a short circuit and large in number of electric leads in the production and use process are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of SSR optocouplers, and in particular to an opposing SSR optocoupler. Background Art

[0002] Relay circuits are mainly used in the home appliance and industrial equipment markets. In terms of home appliances, they are often used in air conditioners, microwave ovens, clothing machines, personal hygiene systems, refrigerators, fan heaters, induction heating cookers and water heaters. Their main function is to drive loads and control load switches. Conventional designs usually use bidirectional thyristors (SCRs) to drive bidirectional thyristors (Thyristors) to control loads. The circuit also includes several electronic components such as resistors and capacitors. Therefore, the circuit needs to be composed of more electronic components, so it occupies a larger PCB area. In addition, due to the relatively large number of electronic components, the probability of overall circuit failure increases.

[0003] For example, in the Chinese patent document with application number CN202411881794.7 and patent name Planar SSR Optocoupler, although this design solves the above-mentioned problems on the optocoupler application side, this structure has certain quality risks during the optocoupler packaging process, as follows: 1. The light transmission efficiency is low. Due to the planar packaging structure, the LED usually needs to be refracted through the LENS to the light-receiving area after emitting light. This process will cause a large amount of light intensity loss and increase the turn-on current of the photosensitive thyristor; 2. The amount of thyristor insulating glue is difficult to control during process control, which may cause glue overflow to the bidirectional photosensitive thyristor chip and cause a short circuit; 3. Too many conductive wires may easily cause quality risks. Since the conductive wires are usually operated by wire bonding machines, the process is relatively difficult to control. It is also easy to cause wire collapse during the operation, affecting product quality. On this basis, the fewer conductive wires, the fewer quality risks. At the same time, since the conductive wires are usually made of gold, the more gold wires there are, the higher the cost. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides a stand-off SSR optocoupler, which solves the technical problems of low light transmission efficiency, easy glue overflow to form short circuits, and a large number of conductive wires in the production and use of existing planar SSR optocouplers.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: a stand-off SSR optocoupler, comprising an input circuit provided on a light-shielding body for inputting an electrical signal, a light-emitting diode provided on a base island of the input circuit, and an output circuit for outputting an electrical signal, the output circuit being provided with a bidirectional thyristor and a bidirectional photosensitive thyristor for receiving an optical signal from the light-emitting diode, the output circuit comprising a fourth pin, a fifth pin for providing the bidirectional photosensitive thyristor, and a sixth pin for providing the bidirectional thyristor; The light emitting diode is arranged opposite to the bidirectional photosensitive thyristor, the M1 interface of the bidirectional photosensitive thyristor is connected to the gate of the bidirectional thyristor, the M2 interface of the bidirectional photosensitive thyristor is connected to the sixth pin, the bidirectional thyristor is connected to the fourth pin through its T1 interface, and the sixth pin is connected to the T2 interface of the bidirectional thyristor.

[0006] Preferably, a vertical projection of the light emitting diode on the plane where the fifth pin is located is located on the bidirectional photosensitive thyristor.

[0007] Preferably, the input circuit includes three independently arranged input pins, and the light emitting diode is arranged on one of the input pins and connected to another input pin.

[0008] Preferably, the fifth pin is located between the fourth pin and the sixth pin, and the bidirectional photosensitive thyristor is located at the end of the fifth pin, and the base island on the sixth pin for mounting the bidirectional thyristor extends to the fourth pin.

[0009] Preferably, the sixth pin is provided with a welding portion extending toward the bidirectional photothyristor, and the welding portion is used to be connected to the M2 interface of the bidirectional photothyristor via a conductive wire.

[0010] Preferably, positioning holes are provided on several of the input pins, the fourth pin, the fifth pin and the sixth pin.

[0011] Preferably, limiting portions are provided on both sides of the fifth pin.

[0012] By means of the above technical solution, the present invention provides a stand-alone SSR optocoupler, which has at least the following beneficial effects: 1. The present invention arranges the light-emitting diode and the bidirectional photosensitive thyristor opposite to each other so that light is directly irradiated onto the surface of the photosensitive thyristor, thereby avoiding the problem of light intensity loss caused by the refraction of light through the lens in the traditional planar structure, and significantly improving the light transmission efficiency. At the same time, the bidirectional thyristor and the bidirectional photosensitive thyristor are placed on different output pins, avoiding the risk of insulating glue overflowing to the photosensitive thyristor chip during the packaging process and reducing the probability of short circuit. In addition, the output circuit adopts an independent layout of three output pins, further reducing the number of conductive wires used. Only 4 conductive wires are needed to complete the connection, which not only reduces the cost of gold wire materials, but also reduces quality risks such as wire collapse and wire breakage in the wire bonding process, thereby improving production yield and product reliability.

[0013] 2. The present invention achieves an optimized design of the optical path by precisely positioning the vertical projection of the light-emitting diode on the output pin to the surface of the bidirectional photosensitive thyristor. This structure shortens the physical distance between the light-emitting diode and the photosensitive thyristor, enabling the light signal to be received at a higher ratio, effectively reducing the turn-on current requirement of the photosensitive thyristor. This design not only improves the overall response speed of the optocoupler, but also reduces the risk of false triggering due to insufficient light intensity, thereby enhancing the accuracy and stability of load control. It is particularly suitable for load switch control scenarios in high-precision industrial equipment and high-frequency household appliances.

[0014] 3. The present invention adopts a three-pin independent design for both the input circuit and the output circuit, sets positioning holes on the pins, and fixes the pins by filling the positioning holes with packaging colloid, thereby significantly improving the vibration and deformation resistance of the packaged structure. In addition, limit parts are added on both sides of the bidirectional photosensitive thyristor in the middle position of the output pin to prevent the connection failure caused by external force offset during packaging or use, thereby ensuring the long-term reliability of the optocoupler under complex working conditions. This structural design is particularly suitable for industrial environments with high temperature, high humidity or large mechanical stress.

[0015] 4. The present invention reduces the number of peripheral components such as resistors and capacitors required by integrating the traditional relay circuit into the form of SSR optocouplers, reduces the space occupancy of the PCB board, and simplifies the complexity of circuit design. This improvement not only reduces the material cost of the overall system, but also reduces the potential failure points caused by the large number of components, and improves the stability of the circuit system. In addition, the simplified circuit is easier to automate production, further reducing manufacturing costs and process control difficulties, and has significant industrial application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 Schematic top view of the SSR optocoupler of the present invention; Figure 2 Schematic side view of the SSR optocoupler of the present invention; Figure 3 The circuit diagram of the SSR optocoupler of the present invention; Figure 4 Schematic diagram of the bidirectional photosensitive thyristor structure and equivalent circuit of the present invention; Figure 5 Schematic diagram of the bidirectional thyristor structure and equivalent circuit of the present invention.

[0017] In the figure: 1. Light-shielding body; 2. Input circuit; 4. Light-emitting diode; 5. Output circuit; 51. Fourth pin; 52. Fifth pin; 53. Sixth pin; 6. Bidirectional thyristor; 7. Bidirectional photosensitive thyristor; 8. Welding part; 9. Positioning hole; 10. Limiting part. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] In order to solve the technical problems of low light transmission efficiency, easy glue overflow to form short circuit and large number of conductive wires in the production and use of existing planar SSR optocouplers, the present invention provides a stand-off SSR optocoupler, such as Figure 1-Figure 5 As shown, the light shielding body 1 is provided with an input circuit 2 for inputting electrical signals, a light emitting diode 4 is provided on the base island of the input circuit 2, and an output circuit 5 for outputting electrical signals is provided, a bidirectional thyristor 6 and a bidirectional photosensitive thyristor 7 for receiving the light signal of the light emitting diode 4 are provided on the output circuit 5, the output circuit 5 includes a fourth pin 51, a fifth pin 52 for setting the bidirectional photosensitive thyristor 7, and a sixth pin 53 for setting the bidirectional thyristor 6, the light emitting diode 4 and the bidirectional photosensitive thyristor 7 are arranged opposite each other, so that the light emitting diode 4 The emitted light is directly received by the bidirectional photosensitive thyristor 7. Compared with the planar structure, the light transmission efficiency is higher, and the bidirectional thyristor 6 and the bidirectional photosensitive thyristor 7 are located on different pins respectively. There is no risk of glue overflowing to the bidirectional photosensitive thyristor 7 and causing a short circuit. The M1 interface of the bidirectional photosensitive thyristor 7 is connected to the gate of the bidirectional thyristor 6, the M2 interface of the bidirectional photosensitive thyristor 7 is connected to the sixth pin 53, the bidirectional thyristor 6 is connected to the fourth pin 51 through its T1 interface, and the sixth pin 53 is connected to the T2 interface of the bidirectional thyristor 6. Figure 1 As shown, it can be found that the number of conductive wires used for connection in the figure is only 4, which is significantly reduced, which can greatly reduce the cost of the conductive wires and reduce the probability of risks in the production process.

[0020] In order to enable the light emitted by the light-emitting diode 4 to be received by the bidirectional photosensitive thyristor 7 more efficiently, the vertical projection of the light-emitting diode 4 on the plane where the fifth pin 52 is located is located on the bidirectional photosensitive thyristor 7, so that the light emitted by the light-emitting diode 4 directly hits the bidirectional photosensitive thyristor 7, and the distance between the two is closer, so that the bidirectional photosensitive thyristor 7 can receive a larger proportion of the light emitted by the light-emitting diode 4, thereby improving the light transmission efficiency.

[0021] The following is a detailed description of a structure of the input circuit 2. The input circuit 2 includes three independently set input pins. The light-emitting diode 4 is set on one of the input pins and is connected to the other input pin through a conductive wire. Figure 1 and Figure 3 As shown, the light emitting diode 4 is set on pin 2, and the positive and negative poles of the light emitting diode 4 are connected to pin 1pin and pin 2pin respectively.

[0022] In order to minimize the length of the conductive wire used, the internal structure of the optocoupler needs to be further planned so that the fifth pin 52 is located between the fourth pin 51 and the sixth pin 53, and the bidirectional photosensitive thyristor 7 is located at the end of the fifth pin 52, and the position on the sixth pin 53 for installing the bidirectional thyristor 6 extends to the fourth pin 51. Figure 1 As shown, the lengths of the conductive lines between the bidirectional thyristor 6 and the fourth pin 51 , between the bidirectional thyristor 6 and the bidirectional photosensitive thyristor 7 , and between the bidirectional photosensitive thyristor 7 and the sixth pin 53 are greatly reduced, thereby reducing costs and the risk of disconnection.

[0023] In order to further reduce the length between the bidirectional thyristor 6 and the sixth pin 53, the sixth pin 53 is provided with a welding portion 8 extending toward the bidirectional photosensitive thyristor 7. The welding portion 8 is used to connect to the M2 interface of the bidirectional photosensitive thyristor 7 through a conductive wire.

[0024] In order to improve the stability of each pin in the packaged product, positioning holes (9) are provided on several of the input pins, the fourth pin 51, the fifth pin 52 and the sixth pin 53, so that the colloid during packaging can enter the positioning holes 9, thereby achieving relative fixation of the positions of each pin.

[0025] Since there are many conductive wires between the output pin of the bidirectional photosensitive thyristor 7 and other pins, it is necessary to further ensure the stability of the pin position. Limiting parts 10 are set on both sides of the fifth pin 52 to ensure that the pin will not slide outward.

[0026] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus.

[0027] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An opposing SSR optocoupler, comprising an input circuit (2) provided on a light shielding body (1) for inputting an electrical signal, a light emitting diode (4) provided on a base island of the input circuit (2), and an output circuit (5) for outputting an electrical signal, characterized in that: The output circuit (5) is provided with a bidirectional thyristor (6) and a bidirectional photosensitive thyristor (7) for receiving a light signal from a light emitting diode (4), and the output circuit (5) includes a fourth pin (51), a fifth pin (52) for setting the bidirectional photosensitive thyristor (7), and a sixth pin (53) for setting the bidirectional thyristor (6); The light emitting diode (4) and the bidirectional photosensitive thyristor (7) are arranged opposite to each other, the M1 interface of the bidirectional photosensitive thyristor (7) is connected to the gate of the bidirectional thyristor (6), the M2 interface of the bidirectional photosensitive thyristor (7) is connected to the sixth pin (53), the bidirectional thyristor (6) is connected to the fourth pin (51) through its T1 interface, and the sixth pin (53) is connected to the T2 interface of the bidirectional thyristor (6).

2. A stand-off SSR optocoupler according to claim 1, characterized in that: The vertical projection of the light emitting diode (4) on the plane where the fifth pin (52) is located is located on the bidirectional photosensitive thyristor (7).

3. The stand-off SSR optocoupler according to claim 1, characterized in that: The input circuit (2) includes three independently arranged input pins, and a light-emitting diode (4) is arranged on one of the input pins and connected to another input pin.

4. The stand-off SSR optocoupler according to claim 1, characterized in that: The fifth pin (52) is located between the fourth pin (51) and the sixth pin (53), and the bidirectional photosensitive thyristor (7) is located at the end of the fifth pin (52), and the base island on the sixth pin (53) for mounting the bidirectional thyristor (6) extends to the fourth pin (51).

5. The stand-off SSR optocoupler according to claim 1, characterized in that: The sixth pin (53) is provided with a welding portion (8) extending in the direction of the bidirectional photosensitive thyristor (7), and the welding portion (8) is used to be connected to the M2 interface of the bidirectional photosensitive thyristor (7) through a conductive wire.

6. The stand-off SSR optocoupler according to claim 3, characterized in that: Positioning holes (9) are provided on a number of the input pins, the fourth pin (51), the fifth pin (52) and the sixth pin (53).

7. The stand-off SSR optocoupler according to claim 1, characterized in that: Limiting portions (10) are provided on both sides of the fifth pin (52).

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