Built-in double-feedback hysteresis solid-state switch circuit

Abstract

The invention discloses a built-in double-feedback hysteresis solid-state switching circuit which comprises a triode, a first photoelectric coupler, a second photoelectric coupler and a field effect transistor, a resistor R2 is connected between an emitting electrode and a collecting electrode of the triode in parallel, and the input end of the resistor R2 is sequentially connected with a resistor R1 and a voltage stabilizing diode D1 in series. The input end of the voltage stabilizing diode D1 and the second pin end of the second photoelectric coupler are connected to the control end for power supply, the output end of the field effect transistor is connected with a voltage stabilizing diode D2 in parallel, and the output end of the voltage stabilizing diode D2 is connected with a power end for power supply. The circuit has a double-feedback hysteresis circuit function, the reliability of circuit control can be improved, the service life of the circuit is prolonged, and the circuit is high in reliability, long in service life, low in noise, free of sparks, free of electromagnetic interference, wider in application range and suitable for product equipment with requirements for power amplification conversion control.

Description

Technical Field

[0001] The invention relates to the field of solid-state switch circuits, in particular to a built-in double-feedback hysteresis solid-state switch circuit. Background Art

[0002] In the application equipment in the fields of industry, aerospace, etc., in order to ensure the reliable conversion and use of low-power electricity to control power amplification in the product, as well as the effective isolation function of low-power electricity and high-power electricity, it is generally achieved through traditional electromechanical electromagnetic relays; however, due to the limitations of its own structure and technology, electromechanical electromagnetic relays have short service life, heavy weight, large size, slow conversion speed, easy to ignite and spark, high noise, and electromagnetic interference, etc., which cannot be used in equipment with high reliability requirements. Summary of the invention

[0003] The object of the present invention is to provide a built-in dual feedback hysteresis solid-state switch circuit to solve the problems of short service life, heavy weight, large volume, slow switching speed, easy ignition and sparks, high noise and electromagnetic interference proposed in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions: A built-in double feedback hysteresis solid-state switch circuit comprises a triode, a first photoelectric coupler, a second photoelectric coupler and a field effect tube, wherein the base of the triode is connected to the fourth pin end of the first photoelectric coupler, a resistor R2 is connected in parallel between the emitter and the collector of the triode, the output end of the resistor R2 is connected to the second photoelectric coupler, the input end of the resistor R2 is sequentially connected in series with a resistor R1 and a voltage regulator diode D1, and the input end of the voltage regulator diode D1 and the second pin end of the second photoelectric coupler are connected to a control end for power supply; the output ends of the first photoelectric coupler and the second photoelectric coupler are connected to the field effect tube through a resistor R3, the output end of the field effect tube is connected in parallel with a voltage regulator diode D2, and the output end of the voltage regulator diode D2 is connected to a power end for power supply.

[0005] Furthermore, the transistor and the first photocoupler cooperate to form a feedback loop of the second photocoupler, and the second photocoupler and the resistor R3 cooperate to form another feedback reflux of the first photocoupler. The resistor R3 is used to form a circuit of the output loop of the first photocoupler, and the resistor R3 is an adjustable resistor to control the conduction degree of the output loop of the first photocoupler.

[0006] Furthermore, the voltage regulator diode D1 is used to increase the on- and off-voltage of the circuit. The voltage regulation value of the voltage regulator diode D1 is parameter U1. The voltage regulator diode D1 is an adjustable diode with adjustable parameter U1, and the output end of the voltage regulator diode D1 is connected to Uin+ powered by the control end.

[0007] Furthermore, the second pin end of the second photoelectric coupler is connected to Uin-, which is the power supply of the control end. The second photoelectric coupler and the first photoelectric coupler are GH302-1S or GH281-2 photoelectric couplers.

[0008] The beneficial effects of the present invention are as follows: the circuit of the present invention is simple, reliable, and low in cost, and has a dual feedback hysteresis circuit function, that is, it can realize the adjustment of the input loop and the hysteresis voltage range, and can also realize the hysteresis characteristics of separating the on-voltage and the off-voltage, and can electrically isolate the electromagnetic control circuit and the electrical execution circuit, thereby improving the reliability of the circuit control and extending the service life of the circuit. It has high reliability, long life, low noise, no sparks, and no electromagnetic interference. It can completely replace the function of the electromechanical electromagnetic relay, and the input control voltage range is adjustable, so the application range is wider, and the application requirements of equipment with high reliability requirements are met, and it is suitable for products and equipment with requirements for power amplification conversion control. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a circuit diagram of a solid-state switch with built-in dual feedback hysteresis according to the present invention.

[0010] In the figure: 1 control end power supply, 2 transistor, 3 first photocoupler, 4 second photocoupler, 5 field effect transistor, 6 power end power supply. DETAILED DESCRIPTION

[0011] 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.

[0012] See also Figure 1 , which provides a technical solution for the present invention, a built-in dual feedback hysteresis solid-state switch circuit, including a transistor 2, a first photocoupler 3, a second photocoupler 4 and a field effect tube 5, the base of the transistor 2 is connected to the fourth pin end of the first photocoupler 3, a resistor R2 is connected in parallel between the emitter and the collector of the transistor 2, the output end of the resistor R2 is connected to the second photocoupler 4, the input end of the resistor R2 is sequentially connected in series with a resistor R1 and a voltage regulator diode D1, and the input end of the voltage regulator diode D1 and the second pin end of the second photocoupler 4 are connected to the control end power supply 1; the voltage regulator diode D1 is used to increase the circuit conduction and shutdown voltages, the voltage regulator value of the voltage regulator diode D1 is a parameter U1, the voltage regulator diode D1 is an adjustable diode with an adjustable parameter U1, and the output end of the voltage regulator diode D1 is connected to Uin+ of the control end power supply 1; the field effect tube 5 adopts but is not limited to the C100N30S5 field effect tube.

[0013] It should be noted that the mentioned Zener diode D1 functions to increase the on- and off-voltages, so that the input characteristic curve of the solid-state switch is shifted as a whole. The input characteristic of the solid-state switch can be adjusted within a range by adjusting the voltage stabilization value U1 parameter of the Zener diode D1; the functions of the resistors R1 and R2 are to form the input current, which is an important variable of the solid-state switch parameters. When the voltage returns to the off stage, the resistor R2 is short-circuited, and the current in the circuit mainly depends on the resistance value of the resistor R1; the mentioned field effect transistor 5 functions as a switch to bear the load current, and the function of the Zener diode D2 is to increase the input voltage of the first photocoupler 3, thereby making the input current of the first photocoupler 3 reach the saturation value.

[0014] In this embodiment, the output ends of the first photocoupler 3 and the second photocoupler 4 are connected to the field effect tube 5 through the resistor R3, the output end of the field effect tube 5 is connected in parallel with the voltage regulator diode D2, and the output end of the voltage regulator diode D2 is connected to the power supply 6; wherein, the second pin end of the second photocoupler 4 is added with Uin- of the control end power supply 1, and the second photocoupler 4 and the first photocoupler 3 adopt but are not limited to GH302-1S type or GH281-2 type photocoupler; the transistor 2 and the first photocoupler 3 cooperate to form a feedback loop of the second photocoupler 4, and the second photocoupler 4 and the resistor R3 cooperate to form another feedback reflux of the first photocoupler 3, the resistor R3 is used to form a circuit of the output loop of the first photocoupler 3, and the resistor R3 is an adjustable resistor to control the conduction degree of the output loop of the first photocoupler 3.

[0015] The built-in dual-feedback hysteresis solid-state switch circuit is in an open circuit state when the input voltage Uin is less than U1, and no current flows through the input circuit; when Uin is greater than U1, the circuit is not turned on, and the first photocoupler 3 is still not working. At this time, the transistor 2 is equivalent to being open circuited, and in this state, the second photocoupler 4 is not fully turned on; as Uin increases, the conduction degree of the photocoupler gradually increases, and when it reaches the required conduction critical value, the positive feedback loop is quickly established; when the second photocoupler 4 is turned on, the first photocoupler 3 is prompted to be turned on, and then the transistor 2 is turned on, and the conduction The resistor R2 is short-circuited, at which time Iin will increase rapidly, and the conduction degree of the first photocoupler 3 will further increase, forming positive feedback until the second photocoupler 4 is fully turned on, thereby realizing the conduction control of the solid-state switch; when the circuit returns after being turned on, the positive feedback effect has been completed, and Iin is much larger than the saturation value when fully turned on; when the input voltage Uin gradually decreases, Iin is equal to the photocoupler fully turned-on current, at this time a reverse positive feedback will be quickly established, and its working mechanism is opposite to the positive feedback mechanism, and the circuit will be quickly turned off, thereby realizing the turn-off control of the solid-state switch.

[0016] 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.

[0017] 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.

Claims

1. A solid-state switch circuit with built-in dual feedback hysteresis, characterized in that: The invention comprises a triode, a first photoelectric coupler, a second photoelectric coupler and a field effect tube, wherein the base of the triode is connected to the fourth pin end of the first photoelectric coupler, a resistor R2 is connected in parallel between the emitter and the collector of the triode, the output end of the resistor R2 is connected to the second photoelectric coupler, the input end of the resistor R2 is sequentially connected in series with a resistor R1 and a voltage regulator diode D1, and the input end of the voltage regulator diode D1 and the second pin end of the second photoelectric coupler are connected to the control end for power supply; the output ends of the first photoelectric coupler and the second photoelectric coupler are connected to the field effect tube through a resistor R3, the output end of the field effect tube is connected in parallel with a voltage regulator diode D2, and the output end of the voltage regulator diode D2 is connected to the power end for power supply.

2. The built-in dual feedback hysteresis solid-state switch circuit according to claim 1, characterized in that: The transistor and the first photocoupler cooperate to form a feedback loop of the second photocoupler, and the second photocoupler and the resistor R3 cooperate to form another feedback reflux of the first photocoupler. The resistor R3 is used to form a circuit of the output loop of the first photocoupler, and the resistor R3 is an adjustable resistor to control the conduction degree of the output loop of the first photocoupler.

3. The built-in dual feedback hysteresis solid-state switch circuit according to claim 1, characterized in that: The voltage regulator diode D1 is used to increase the on- and off-voltage of the circuit. The voltage regulation value of the voltage regulator diode D1 is parameter U1. The voltage regulator diode D1 is an adjustable diode with adjustable parameter U1, and the output end of the voltage regulator diode D1 is connected to Uin+ powered by the control end.

4. The built-in dual feedback hysteresis solid-state switch circuit according to claim 1, characterized in that: The second pin end of the second photoelectric coupler is connected to Uin-, which is the power supply of the control end. The second photoelectric coupler and the first photoelectric coupler adopt GH302-1S or GH281-2 photoelectric couplers.

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