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CN-122026880-A - Optical relay and electronic device

CN122026880ACN 122026880 ACN122026880 ACN 122026880ACN-122026880-A

Abstract

The embodiment of the application discloses an optical relay, which comprises a clamping circuit, wherein the clamping circuit is used for clamping the voltage difference between a second power stage and a control electrode of a transistor in an optical receiving conversion module, so that the transistor is protected, the voltage application range of the optical relay is enlarged, and the reliability of the optical relay is improved.

Inventors

  • SHAO LILI
  • HE HUISEN

Assignees

  • 南京矽力微电子技术有限公司

Dates

Publication Date
20260512
Application Date
20251229

Claims (12)

  1. 1. An optical relay, the optical relay comprising: The light emitting module receives the electric signal to control the light emitting diode; the power output switch module comprises a switch tube, and the state of the switch tube is controlled through a control signal so as to control whether power is output or not; the light receiving conversion module comprises a light receiving diode string, a first transistor and a clamping circuit, wherein the light receiving diode string is used for receiving the light signals of the light emitting diodes; the first power stage of the first transistor is connected with the anode of the light receiving diode string and is connected with the control electrode of the switching tube; the voltage difference between the second power stage and the control electrode of the first transistor is controlled by a clamping circuit; the clamping circuit comprises a first resistor and a clamping diode string which are connected in parallel.
  2. 2. The optical relay of claim 1, wherein: the first transistor is a depletion transistor.
  3. 3. The optical relay of claim 1, wherein: the diodes in the clamping diode string are ordinary diodes.
  4. 4. An optical relay according to claim 3, wherein: The cathode of the clamping diode string is connected with the cathode of the light receiving diode string, and the anode of the clamping diode string is connected with the second power pole of the first transistor.
  5. 5. The optical relay of claim 1, wherein: the power output switch module comprises a first switch tube and a second switch tube, wherein the control electrode of the first switch tube is connected with the control electrode of the second switch tube, and the second power stage of the first switch tube is connected with the second power stage of the second switch tube.
  6. 6. The optical relay of claim 1, wherein: When a switching tube in the power output switching module is turned on, the first transistor is in a weak off state.
  7. 7. The optical relay of claim 6, wherein: The current value of the first transistor in a weak off state is set by setting the on-voltage drop of the light-receiving diode string and the resistance value of the first resistor.
  8. 8. The optical relay of claim 7, wherein: When the switching tube in the power output switching module is conducted, the difference value between the forward conduction voltage drop of the light receiving diode string and the voltage at the two ends of the first resistor is larger than or equal to the conduction threshold value of the switching tube in the power output switching module, wherein the voltage at the two ends of the first resistor is equal to the product of the current value of the first transistor in a weak off state and the resistance value of the first resistor.
  9. 9. The optical relay of claim 1, wherein: When an inrush current occurs, the first transistor is turned on to bleed the inrush current.
  10. 10. The optical relay of claim 9, wherein: when an inrush current occurs, the voltage difference between the gate and the source of the first transistor is clamped to-vf_pd2×m, where vf_pd2 is the forward voltage drop when a single diode in the clamping diode string is turned on, and M is the number of diodes in the clamping diode string.
  11. 11. The optical relay of claim 1, wherein: The light emitting module, the power output switch module and the light receiving conversion module are integrated in one integrated circuit.
  12. 12. An electronic device, characterized in that: Comprising an optical relay according to any one of claims 1 to 11.

Description

Optical relay and electronic device Technical Field The application relates to the field of electronic circuits, in particular to an optical relay and electronic equipment. Background The optical relay is a technology for realizing electrical isolation through optical signals and is widely applied to the fields of power electronics, communication, industrial control and the like. When an inrush current occurs, it may affect the elements of the relay, even cause damage. Disclosure of Invention The embodiment of the application provides an optical relay, which comprises an optical emission module, a power output switch module, an optical receiving conversion module and a clamping circuit, wherein the optical emission module receives an electric signal to control a light emitting diode, the power output switch module comprises a switch tube, the state of the switch tube is controlled by the control signal to control whether power is output or not, the optical receiving conversion module comprises a light receiving diode string, a first transistor and the clamping circuit, the light receiving diode string is used for receiving an optical signal of the light emitting diode, the first power stage of the first transistor is connected with an anode of the light receiving diode string and is connected with a control electrode of the switch tube, a voltage difference between the second power stage of the first transistor and the control electrode is controlled by the clamping circuit, and the clamping circuit comprises a first resistor and the clamping diode string which are connected in parallel. Optionally, the diodes in the clamping diode string are normal diodes. The embodiment of the application also provides electronic equipment comprising the optical relay. The embodiment of the application provides an optical relay, wherein an optical receiving conversion module comprises a clamping circuit, a voltage difference between a second power stage and a control electrode of a first transistor is controlled by the clamping circuit and used for protecting the first transistor, the voltage application range of the optical relay is enlarged, and a clamping diode string in the clamping circuit adopts a common diode. Drawings The above and other objects, features and advantages of the present application will become more apparent from the following description of embodiments of the present application with reference to the accompanying drawings, in which: Fig. 1 is a block diagram of an optical relay according to an embodiment of the present application; Fig. 2 is a circuit diagram of an optical relay according to an embodiment of the present application. Detailed Description The present application is described below based on examples, but the present application is not limited to only these examples. In the following detailed description of the present application, certain specific details are set forth in detail. The present application will be fully understood by those skilled in the art without the details described herein. Well-known methods, procedures, flows, components and circuits have not been described in detail so as not to obscure the nature of the application. It will be appreciated by those of ordinary skill in the art that the drawings provided herein are for illustrative purposes and that the drawings are not necessarily drawn to scale. It should be understood that in the following description, "circuit" refers to an electrically conductive loop formed by at least one element or sub-circuit through electrical or electromagnetic connection. When an element or circuit is referred to as being "connected to" another element or being "connected between" two nodes, it can be directly connected or connected to the other element or intervening elements may be present and the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly connected to" another element, it means that there are no intervening elements present. Unless the context clearly requires otherwise, the words "comprise," comprising, "" include, "and the like are to be construed as meaning rather than being exclusive or exhaustive, that is to say, as meaning" including but not limited to. In the description of the present application, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, in the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more. The present application provides an optical relay, as shown in fig. 1, an optical relay 10 includes an optical transmitting module 11, an optical receiving conversion module 12, and a power output switching module 13. The light emitting module 11 controls the light emitting diode by receiving an electric signal, the po