Normally open solid-state switch circuit based on optical isolation
By designing an optically isolated normally open solid-state switch circuit, using photocouplers and field effect tube components to achieve electrical isolation, the reliability and conversion speed problems of traditional electromechanical and mechanical contact electromagnetic relays are solved, and high reliability and rapid conversion effects are achieved.
Patent Information
- Application Number
- CN202411399207.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-09
- Publication Date
- 2025-03-11
AI Technical Summary
Traditional electromechanical and electromechanical contact electromagnetic relays have problems such as low reliability, short service life and slow conversion speed in applications in industries, aerospace and other fields, and cannot meet the equipment application requirements of high reliability requirements.
An optically isolated normally open solid-state switch circuit is designed, and the electrical isolation of the control circuit and the electrical execution circuit is achieved by combining a voltage divider circuit, a field effect tube assembly and a filter circuit.
It improves the reliability and service life of circuit control, has the characteristics of high reliability, fast conversion speed, low cost and wider application range, and meets the equipment application needs of high reliability requirements.
Smart Images
Figure CN119602771A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of normally-on solid-state switch circuits, in particular to a normally-on solid-state switch circuit based on optical isolation. Background Art
[0002] In order to ensure reliable conversion of single-channel normally open power amplifiers in products, in application equipment in the fields of industry, aerospace, etc., it is generally achieved through traditional electromechanical normally closed contact type electromagnetic relays. However, due to the limitations of their own structure and technology, traditional electromechanical normally closed contact type electromagnetic relays have problems such as low reliability, short service life and slow conversion speed, and cannot be used for equipment with large vibration values and high reliability requirements. Summary of the invention
[0003] The purpose of the present invention is to provide a normally open solid-state switch circuit based on optical isolation to solve the problems of low reliability, short service life and slow switching speed of traditional electromechanical normally closed contact type electromagnetic relays proposed in the above background technology.
[0004] To achieve the above object, the present invention provides the following technical solutions: A normally open solid-state switch circuit based on optical isolation, comprising: Voltage divider circuit, A field effect tube component, wherein the field effect tube component is connected to a voltage divider circuit, and a pin end of the field effect tube component is connected to a power input end or a power output end; A filter circuit, wherein the input end of the filter circuit is connected to the field effect tube component, and the filter circuit comprises a resistor R5 and a capacitor C1; The input end of the voltage divider circuit is connected to a photocoupler, and the input end of the photocoupler is connected to the power supply end through a resistor R1; the output end of the filter circuit is connected to a voltage regulator diode.
[0005] Furthermore, the field effect transistor assembly includes a field effect transistor Q1 and a field effect transistor Q2, the drain of the field effect transistor Q1 and the drain of the field effect transistor Q2 are connected together through a wire and a resistor R4 is connected to the wire, the output end of the resistor R4 is grounded GND, and the resistor R4 is used to provide a zero point potential for the back-to-back field effect transistors to ensure that the power output voltage is effective.
[0006] Furthermore, the gates of the field effect transistor Q1 and the field effect transistor Q2 are both connected to the voltage divider circuit, and the sources of the field effect transistor Q1 and the field effect transistor Q2 are connected to the power input end or the power output end.
[0007] Furthermore, the voltage divider circuit is composed of a resistor R2, a diode D1 and a resistor R3, and the voltage divider circuit is used to divide the output voltage of the photocoupler to provide a driving voltage for the field effect transistor component.
[0008] Furthermore, the second pin of the photocoupler is connected to GND, the fourth pin of the photocoupler is connected to +15VCC, and the third pin of the photocoupler is connected to the voltage divider circuit.
[0009] The beneficial effects of the present invention are as follows: the present invention can electrically isolate the control circuit and the electrical execution circuit, thereby improving the reliability and service life of the circuit control, and has the characteristics of high reliability, fast conversion speed, low cost, and a wider range of applications. It meets the application needs of equipment with high reliability requirements and can be used for product equipment that has requirements for power amplification conversion control. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 This is a circuit diagram of a normally open solid-state switch based on optical isolation according to the present invention.
[0011] In the figure: 1 power supply end, 2 photocoupler, 3 voltage divider circuit, 4 field effect tube assembly, 5 power input end, 6 voltage regulator diode, 7 power output end. DETAILED DESCRIPTION
[0012] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.
[0013] See also Figure 1 , which provides a technical solution for the present invention, a normally open solid-state switch circuit based on optical isolation, including a voltage divider circuit 3, a field effect tube component 4 and a filter circuit, the field effect tube component 4 is connected to the voltage divider circuit 3, and the pin end of the field effect tube component 4 is connected to the power input end 5 or the power output end 7; the input end of the filter circuit is connected to the field effect tube component 4, and the filter circuit includes a resistor R5 and a capacitor C1, and the resistor R5 and the capacitor C1 are used to perform RC filtering on the power electricity; wherein, the input end of the voltage divider circuit 3 is connected to a photoelectric coupler 2, and the input end of the photoelectric coupler 2 is connected to the power supply end 1 through a resistor R1, and the resistor R1 is used to form a control input current to ensure the normal operation of the solid-state switch; the output end of the filter circuit is connected to a voltage regulator diode 6; wherein the voltage divider circuit 3 mentioned is composed of a resistor R2, a diode D1 and a resistor R3, and the voltage divider circuit 3 is used to divide the output voltage of the photoelectric coupler 2 to provide a driving voltage for the field effect tube component 4.
[0014] It should be noted that the second pin of the photocoupler 2 is connected to GND, the fourth pin of the photocoupler 2 is connected to +15VCC, and the third pin of the photocoupler 2 is connected to the voltage divider circuit 3; the photocoupler 2 mentioned adopts but is not limited to the GH302-1S photocoupler.
[0015] In this embodiment, the field effect transistor assembly 4 mentioned includes a field effect transistor Q1 and a field effect transistor Q2, the drain of the field effect transistor Q1 and the drain of the field effect transistor Q2 are connected together through a wire and a resistor R4 is connected to the wire, the output end of the resistor R4 is grounded GND, and the resistor R4 mentioned is used to provide a zero point potential for the back-to-back field effect transistors to ensure that the power output voltage is effective; the gates of the field effect transistor Q1 and the field effect transistor Q2 are both connected to the voltage divider circuit 3, and the sources of the field effect transistor Q1 and the field effect transistor Q2 are connected to the power input terminal 5 or the power output terminal 7, and the power input terminal 5 or the power output terminal 7 can be marked as 28V-A1, or marked as 28V-A2.
[0016] Among them, the field effect transistor Q1 and the field effect transistor Q2 mentioned are both but not limited to C100N30S5 field effect transistors. The function of the field effect transistor Q1 and the field effect transistor Q2 is to act as switches and bear the load current; the voltage regulator diode 6 is marked as D2, and its function is to increase the input voltage of the power end, thereby making the power input current reach the saturation value; the field effect transistor Q1 and the field effect transistor Q2 are connected back to back, that is, the drain of the field effect transistor Q1 and the field effect transistor Q2 are connected together, so that the solid-state switch has a bidirectional input and output characteristic, and realizes the non-polarity requirement of the power end.
[0017] In this optically isolated normally open solid-state switch circuit, when the power supply terminal 1 inputs a 28V-X1 voltage, and as the input voltage increases, the conduction degree of the photocoupler 2 gradually increases. When it reaches the required conduction threshold, the photocoupler 2 is turned on, which causes the field effect tube Q1 and the field effect tube Q2 to be turned on, and the solid-state switch control is turned on, thereby realizing the conversion of the contact from the normally open state to the normally closed state; when the circuit returns after being turned on, the input voltage gradually decreases, and the conduction degree of the photocoupler 2 gradually decreases. When it reaches the shutdown threshold, the photocoupler 2 is turned off, which causes the field effect tube Q1 and the field effect tube Q2 to be turned on. When the field effect tube Q2 is disconnected, the circuit will be quickly shut down, thereby realizing the shutdown control of the solid-state switch; wherein, the optically isolated normally open solid-state switch circuit realizes the function of a single-channel normally open power amplifier circuit through a photoelectric coupler 2, a resistor R2, a diode D1, a capacitor C1, a zener diode 6, a field effect tube Q1 and a field effect tube Q2 devices, the photoelectric coupler 2 and the resistor R1 are used to realize the isolation of the low-voltage control circuit and the high-power output voltage, and the field effect tube Q1, the field effect tube Q2, the zener diode 6, the resistor R4, the resistor R5 and the capacitor C1 are used to realize the power amplifier output function.
[0018] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0019] The above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be understood that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection, or integrated; it can be a mechanical connection; among them, there are many ways of detachable installation, for example, it can be through the method of plug-in and buckle matching, for example, through the method of bolt connection, etc.
[0020] Although 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 the 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. A normally open solid-state switch circuit based on optical isolation, characterized in that: include: Voltage divider circuit, A field effect tube component, wherein the field effect tube component is connected to a voltage divider circuit, and a pin end of the field effect tube component is connected to a power input end or a power output end; A filter circuit, wherein the input end of the filter circuit is connected to the field effect tube component, and the filter circuit comprises a resistor R5 and a capacitor C1; The input end of the voltage divider circuit is connected to a photocoupler, and the input end of the photocoupler is connected to the power supply end through a resistor R1; the output end of the filter circuit is connected to a voltage regulator diode.
2. The optically isolated normally open solid-state switch circuit according to claim 1, characterized in that: The field effect transistor assembly includes a field effect transistor Q1 and a field effect transistor Q2, the drain of the field effect transistor Q1 and the drain of the field effect transistor Q2 are connected together through a wire and a resistor R4 is connected to the wire, the output end of the resistor R4 is grounded GND, and the resistor R4 is used to provide a zero point potential for the back-to-back field effect transistors to ensure that the power output voltage is effective.
3. The optically isolated normally open solid-state switch circuit according to claim 1, characterized in that: The gates of the field effect transistor Q1 and the field effect transistor Q2 are both connected to the voltage divider circuit, and the sources of the field effect transistor Q1 and the field effect transistor Q2 are connected to the power input end or the power output end.
4. The optically isolated normally open solid-state switch circuit according to claim 1, characterized in that: The voltage divider circuit is composed of a resistor R2, a diode D1 and a resistor R3, and is used to divide the output voltage of the photoelectric coupler to provide a driving voltage for the field effect tube component.
5. The optically isolated normally open solid-state switch circuit according to claim 1, characterized in that: The second pin end of the photoelectric coupler is connected to GND, the fourth pin end of the photoelectric coupler is connected to +15VCC, and the third pin end of the photoelectric coupler is connected to the voltage divider circuit.