Conversion type solid-state switch circuit based on optical isolation

Abstract

The invention discloses a conversion type solid-state switch circuit based on optical isolation, which comprises a photoelectric coupler assembly, a voltage division unit and a switch device, the input end of the photoelectric coupler assembly is connected to a power supply end through a current conversion device, and the voltage division unit is connected to the output end of the photoelectric coupler assembly. The switching device is connected to the output end of the voltage dividing unit, the switching device is used for bearing load current to generate power electricity, and the output end of the switching device is connected with a filter circuit and a power end to supply power; the circuit is simple, reliable and low in cost, can be used for replacing the function of an electromechanical conversion contact type electromagnetic relay, can realize the isolation of low-voltage control electricity and high-power output voltage, greatly improves the reliability of circuit control, prolongs the service life of the circuit, and is suitable for product equipment with requirements on power amplification conversion control.

Description

Technical Field

[0001] The invention relates to the field of solid-state switch circuits, in particular to a solid-state switch circuit based on optical isolation conversion. Background Art

[0002] In the application equipment of industry, aerospace and other fields, in order to ensure the reliable conversion of normally open and normally closed conversion type power amplifier in the product, it is generally realized through traditional electromechanical conversion contact type electromagnetic relays. However, due to the limitations of their own structure and technology, electromechanical electromagnetic relays / contactors have low reliability and short service life, and cannot be used in equipment with high reliability requirements. Summary of the invention

[0003] The object of the present invention is to provide a solid-state switch circuit based on optical isolation conversion to solve the problems of low reliability and short service life mentioned in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions: A solid-state switch circuit based on optical isolation conversion, comprising: A photoelectric coupler component, wherein the input end of the photoelectric coupler component is connected to the power supply end through a current conversion device; A voltage dividing unit, wherein the voltage dividing unit is connected to an output end of the photoelectric coupler component; A switch device is connected to the output end of the voltage divider unit, and is used to bear the load current to generate power electricity. The output end of the switch device is connected to a filter circuit and a power end unit.

[0005] Furthermore, the photoelectric coupler component is composed of a first photoelectric coupler and a second photoelectric coupler, the current conversion device includes a resistor R1 connected to the first photoelectric coupler, and a resistor R2 and a resistor R3 connected to the second photoelectric coupler; the voltage divider unit includes a first voltage divider circuit connected to the output end of the first photoelectric coupler, and a second voltage divider circuit connected to the output end of the second photoelectric coupler.

[0006] Furthermore, the first voltage-dividing circuit cooperates with the second voltage-dividing circuit to divide the output voltage of the optocoupler component, the first voltage-dividing circuit is composed of a resistor R4, a diode D1 and a resistor R5 connected in parallel, and the second voltage-dividing circuit is composed of a resistor R6, a resistor R8, a resistor R7, a resistor R9, a diode D4 and a diode D5 connected in parallel.

[0007] Furthermore, the switching device includes two groups of field effect transistors Q1-Q2 connected to the first voltage divider circuit, and two groups of field effect transistors Q3-Q4 connected to the second voltage divider circuit, the drain of the field effect transistor Q1 is connected to the drain of the field effect transistor Q2, and a resistor R10 is connected to the common connecting wire of the drain of the field effect transistor Q1 and the field effect transistor Q2; the source of the field effect transistor Q3 is connected to the source of the field effect transistor Q4.

[0008] Furthermore, the power end unit includes power end power supply No. 1, power end power supply No. 2 and power end power supply No. 3, and power end power supply No. 1 and power end power supply No. 2 are connected to the output ends of two groups of field effect tubes Q1-Q2, and power end power supply No. 3 is connected to the output end of field effect tube Q4.

[0009] Furthermore, the filtering circuit includes a resistor R13, a capacitor C1, a resistor R14 and a capacitor C2, wherein the resistor R13 and the capacitor C1 are used to perform RC filtering on the power electricity generated by the field effect transistor Q1 and the field effect transistor Q2, and the resistor R14 and the capacitor C2 are used to perform RC filtering on the power electricity generated by the field effect transistor Q3 and the field effect transistor Q4; the input end of the filtering circuit is connected with a Zener diode D6 and a Zener diode D7, the Zener diode D6 is connected to the resistor R13 and is used to increase the input voltage of the power supply of the No. 1 power terminal and the No. 2 power terminal, and the Zener diode D7 is connected to the resistor R14 and is used to increase the input voltage of the power supply of the No. 3 power terminal.

[0010] The beneficial effects of the present invention are: The circuit of the present invention is simple, reliable and low-cost, and can be used to replace the function of an electromechanical conversion contact type electromagnetic relay. It can achieve isolation between low-voltage control power and high-power output voltage, greatly improve the reliability of circuit control, and extend the service life of the circuit. It is suitable for products and equipment that require power amplification conversion control. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The present invention is based on the optical isolation conversion type solid-state switch circuit diagram.

[0012] In the figure: 1 power supply end, 2 first photoelectric coupler, 3 second photoelectric coupler, 4 power supply of power end No. 1, 5 power supply of power end No. 2, 6 power supply of power end No. 3. DETAILED DESCRIPTION

[0013] 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.

[0014] See also Figure 1 , which provides a technical solution for the present invention, a solid-state switch circuit based on optical isolation conversion, including a photoelectric coupler component, a voltage divider unit and a switch device; the input end of the photoelectric coupler component is connected to the power supply terminal 1 through a current conversion device, and the power supply terminal 1 outputs a 28V voltage; the voltage divider unit is connected to the output end of the photoelectric coupler component; the switch device is connected to the output end of the voltage divider unit, and the switch device is used to bear the load current to generate power electricity, and the output end of the switch device is connected to a filter circuit and a power end unit.

[0015] In this embodiment, the photoelectric coupler assembly mentioned is composed of a first photoelectric coupler 2 and a second photoelectric coupler 3. The first photoelectric coupler 2 can be marked with U1, and the second photoelectric coupler 3 can be marked with U2. The first photoelectric coupler 2 and the second photoelectric coupler 3 are but not limited to GH302-1S or GH281-2 photocouplers; wherein the current conversion device mentioned includes a resistor R1 connected to the first photoelectric coupler 2, and a resistor R2 and a resistor R3 connected to the second photoelectric coupler 3; the voltage divider unit includes a first voltage divider circuit connected to the output end of the first photoelectric coupler 2, and a second voltage divider circuit connected to the output end of the second photoelectric coupler 3; the first voltage divider The first voltage-dividing circuit cooperates with the second voltage-dividing circuit to divide the output voltage of the photoelectric coupler component to provide a driving voltage for the switching device; the first voltage-dividing circuit is composed of a resistor R4, a diode D1 and a resistor R5 connected in parallel, and the second voltage-dividing circuit is composed of a resistor R6, a resistor R8, a resistor R7, a resistor R9, a diode D4 and a diode D5 connected in parallel, the output end of the diode D4 is connected to a diode D2, and the free end of the diode D2 is directly grounded to GND; the input end of the diode D5 is connected to a diode D3, and the free end of the diode D3 is directly grounded to GND, and the role of the diode D2 and the diode D3 is to isolate the 28V power input to avoid a power input short circuit.

[0016] In this embodiment, the switching device mentioned includes two groups of field effect transistors Q1-Q2 connected to the first voltage divider circuit, and two groups of field effect transistors Q3-Q4 connected to the second voltage divider circuit, the field effect transistor Q1 is connected to the drain of the field effect transistor Q2, and a resistor R10 is connected to the common connecting wire of the drain of the field effect transistor Q1 and the field effect transistor Q2; the field effect transistor Q3 is connected to the source of the field effect transistor Q4, and a resistor R11 and a resistor R12 are connected in series between the gates of the field effect transistor Q3 and the field effect transistor Q4, and the resistors R11, R12 and R10 are used to provide a zero point potential for the switching device to ensure that the power output voltage is effective; wherein, the power end unit mentioned includes a first power end power supply 4, a second power end power supply 5 and a third power end power supply 6, and the first power end power supply 4 and the second power end power supply 5 are connected to the output ends of the two groups of field effect transistors Q1-Q2, and the third power end power supply 6 is connected to the output end of the field effect transistor Q4.

[0017] It should be noted that the mentioned filtering circuit includes a resistor R13, a capacitor C1, a resistor R14 and a capacitor C2, wherein the resistor R13 and the capacitor C1 are used to perform RC filtering on the power electricity generated by the field effect transistor Q1 and the field effect transistor Q2, and the resistor R14 and the capacitor C2 are used to perform RC filtering on the power electricity generated by the field effect transistor Q3 and the field effect transistor Q4; the input end of the filtering circuit is connected with a Zener diode D6 and a Zener diode D7, the Zener diode D6 is connected to the resistor R13 and is used to increase the input voltage of the No. 1 power supply 4 and the No. 2 power supply 5, thereby making the power input current reach a saturation value; the Zener diode D7 is connected to the resistor R14 and is used to increase the input voltage of the No. 3 power supply 6, thereby making the power input current reach a saturation value; wherein, the No. 1 power supply 4, the No. 2 power supply 5 and the No. 3 power supply 6 are respectively marked as 28V-A1, 28V-A2 and 28V-A3.

[0018] The solid-state switch circuit based on optical isolation conversion, when in use, when the power voltage 28V-A1 is input, U1 and U2 are not working, the normally closed contacts are turned on, 28V-A3 outputs power, the normally open contacts are turned off, and 28V-A2 has no output; when the voltage 28V-X1 is input, and as the input voltage increases, the conduction degree of the U1 and U2 photocouplers gradually increases, and when the required conduction threshold is reached, U1 and U2 are turned on, which in turn causes the field effect tubes Q1, Q2, Q3, and Q4 to be turned on, and the solid-state switch controls the normally closed contacts to be turned off. , the normally open contact is connected, thereby realizing the conversion of the channel normally closed-normally open state; when the circuit returns after being turned on, when the input voltage gradually decreases, and the conduction degree of the optocoupler gradually decreases, when the shutdown threshold is reached, U1 and U2 are turned off, which in turn causes the field effect transistors Q1, Q2, Q3, and Q4 to be disconnected, and the circuit will be quickly turned off, thereby realizing the conversion of the solid-state switch normally open-normally closed state; among them, the field effect transistors Q1, Q2, Q3, and Q4 are but not limited to C100N30S5 field effect transistors.

[0019] The technical features of the above embodiments may be combined arbitrarily. 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.

[0020] 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.

[0021] 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 solid-state switch circuit based on optical isolation conversion, characterized in that: include: A photoelectric coupler component, wherein the input end of the photoelectric coupler component is connected to the power supply end through a current conversion device; A voltage dividing unit, wherein the voltage dividing unit is connected to an output end of the photoelectric coupler component; A switch device is connected to the output end of the voltage divider unit, and is used to bear the load current to generate power electricity. The output end of the switch device is connected to a filter circuit and a power end unit.

2. The optically isolated conversion type solid-state switch circuit according to claim 1, characterized in that: The photoelectric coupler component is composed of a first photoelectric coupler and a second photoelectric coupler, the current conversion device includes a resistor R1 connected to the first photoelectric coupler, and resistors R2 and R3 connected to the second photoelectric coupler; the voltage divider unit includes a first voltage divider circuit connected to the output end of the first photoelectric coupler, and a second voltage divider circuit connected to the output end of the second photoelectric coupler.

3. The optically isolated conversion type solid-state switch circuit according to claim 2, characterized in that: The first voltage divider circuit cooperates with the second voltage divider circuit to divide the output voltage of the optocoupler component. The first voltage divider circuit is composed of a resistor R4, a diode D1 and a resistor R5 connected in parallel, and the second voltage divider circuit is composed of a resistor R6, a resistor R8, a resistor R7, a resistor R9, a diode D4 and a diode D5 connected in parallel.

4. The optically isolated conversion type solid-state switch circuit according to claim 1, characterized in that: The switching device includes two groups of field effect transistors Q1-Q2 connected to the first voltage divider circuit, and two groups of field effect transistors Q3-Q4 connected to the second voltage divider circuit. The drain of the field effect transistor Q1 is connected to the drain of the field effect transistor Q2, and a resistor R10 is connected to the common connecting wire of the drain of the field effect transistor Q1 and the field effect transistor Q2; the source of the field effect transistor Q3 is connected to the source of the field effect transistor Q4.

5. The optically isolated conversion type solid-state switch circuit according to claim 1, characterized in that: The power end unit includes power end power supply No. 1, power end power supply No. 2 and power end power supply No. 3, and the power end power supply No. 1 and power end power supply No. 2 are connected to the output ends of two sets of field effect tubes Q1-Q2, and the power end power supply No. 3 is connected to the output end of the field effect tube Q4.

6. The optically isolated conversion type solid-state switch circuit according to claim 1, characterized in that: The filtering circuit includes a resistor R13, a capacitor C1, a resistor R14 and a capacitor C2, wherein the resistor R13 and the capacitor C1 are used to perform RC filtering on the power electricity generated by the field effect transistor Q1 and the field effect transistor Q2, and the resistor R14 and the capacitor C2 are used to perform RC filtering on the power electricity generated by the field effect transistor Q3 and the field effect transistor Q4; the input end of the filtering circuit is connected with a Zener diode D6 and a Zener diode D7, the Zener diode D6 is connected to the resistor R13 and is used to increase the input voltage of the power supply of the No. 1 power terminal and the No. 2 power terminal, and the Zener diode D7 is connected to the resistor R14 and is used to increase the input voltage of the power supply of the No. 3 power terminal.

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