CN220673754U - Optocoupler isolation field effect transistor output circuit - Google Patents

Abstract

The utility model discloses an optocoupler isolation field effect transistor output circuit which comprises a voltage input circuit, an input signal detection circuit and an input signal isolation feedback circuit, wherein the input voltage is respectively and electrically connected with the input signal detection circuit and the input signal isolation feedback circuit. The utility model can increase the stability of the relay control module, protect components in the circuit and prolong the service life of the relay.

Description

Optocoupler isolation field effect transistor output circuit

Technical Field

The utility model relates to the technical field of electronics, in particular to an output circuit of an optocoupler isolation field effect transistor.

Background

In the related art, along with the gradual change of the development technology of the internet of things, the needs of people for the stability of the relay control module are gradually increased, but the following problems still exist: 1) The input signal will interfere; 2) The working state of each channel cannot be intuitively detected; 3) The feedback circuit is not provided, so that the components cannot be protected; 4) The relay is easy to damage; a hysteresis state of the switch, etc. may occur. Therefore, how to solve the above technical problems is a technical problem that needs to be solved at present.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the optocoupler isolation field effect transistor output circuit which can increase the stability of a relay control module, protect components in the circuit and prolong the service life of the relay.

The utility model also provides an optocoupler isolation field effect transistor output circuit which comprises a voltage input circuit, an input signal detection circuit and an input signal isolation feedback circuit, wherein the input voltage is respectively and electrically connected with the input signal detection circuit and the input signal isolation feedback circuit.

In some embodiments, the voltage input circuit of the present utility model includes a connection terminal P1, a connection terminal P2, and a connection terminal P3, wherein pin 1 of the connection terminal P2 is grounded, and pin 2 thereof is connected to a power source VCC;

the input signal isolation feedback circuit comprises an optical coupling isolation circuit and a relay coil feedback protection circuit; the optocoupler isolation circuit comprises an optocoupler isolator U1, a resistor R3 and a resistor R5, wherein a No. 1 pin of the optocoupler isolator U1 is connected with a No. 4 pin of the wiring terminal P1 through the resistor R1, a No. 2 pin of the optocoupler isolator U1 is connected with a No. 3 pin of the wiring terminal P1, a No. 3 pin of the optocoupler isolator U1 is connected with a No. 1 pin of the wiring terminal P2 through the resistor R3 and the resistor R5, and a No. 4 pin of the optocoupler isolator U1 is connected with a No. 2 pin of the wiring terminal P2.

The relay coil feedback protection circuit comprises a resistor R2, a resistor R6, a light emitting diode LED2 and a field effect tube Q1, wherein a grid G of the field effect tube Q1 is connected to a circuit between the resistor R3 and the resistor R5, a source S of the field effect tube Q is connected with a No. 1 pin of the wiring terminal P2 through the light emitting diode LED2 and the resistor R6, and a drain D of the field effect tube Q1 is connected with a No. 2 pin of the wiring terminal P2 through the resistor R2; and a pin 1 of the wiring terminal P3 is connected with the source electrode of the field effect transistor Q1, and a pin 2 of the wiring terminal P2 is connected with a pin 1 of the wiring terminal P2.

In some embodiments, the optocoupler isolation circuit of the present utility model further includes an optocoupler isolator U2, and a resistor R7, a resistor R9, and a resistor R10, where pin No. 1 of the optocoupler isolator U2 is connected to pin No. 2 of the connection terminal P2 through the resistor R7, pin No. 2 of the optocoupler isolator U2 is connected to pin No. 1 of the connection terminal P1, pin No. 3 of the optocoupler isolator U2 is connected to pin No. 1 of the connection terminal P2 through the resistor R9 and the resistor R10, and pin No. 4 of the optocoupler isolator U2 is connected to pin No. 2 of the connection terminal P2.

In some embodiments, the relay coil feedback protection circuit of the present utility model further comprises a resistor R8, a resistor R11, a light emitting diode LED3, and a field effect transistor Q2; the grid electrode G of the field effect tube Q2 is connected to a circuit between a resistor R9 and a resistor R10, the source electrode S of the field effect tube Q2 is connected with the No. 1 pin of the wiring terminal P2 through a light emitting diode LED3 and a resistor R11, and the drain electrode D of the field effect tube Q2 is connected with the No. 2 pin of the wiring terminal P2 through a resistor R8; the pin 1 of the wiring terminal P3 is connected with the source S of the field effect transistor Q1, the pins 2 and 3 are connected with the pin 1 of the wiring terminal P2, and the pin 4 is connected with the source S of the field effect transistor Q2.

In some embodiments, the input signal detection circuit of the present utility model includes a resistor R4 and a diode LED1, where one end of the resistor R4 is connected to pin No. 2 of the connection terminal P2, and the other end is connected to pin No. 1 of the connection terminal P2 through the diode LED 1.

In some embodiments, the model of the optocoupler isolator U1 and the model of the optocoupler isolator U2 are APY210TX, and the model of the field effect transistor Q1 and the model of the field effect transistor Q2 are 50N10.

Compared with the prior art, the utility model has the following advantages:

1) The utility model is used for controlling the on-off of the MOS tube by controllers such as a singlechip and a PLC, and the like, and the optocoupler isolation circuit guarantees the stability of an input signal, so that a signal loop is isolated from a power supply loop, and the problem that the controller controls the output of a relay (the wiring terminal P1 is the input of the controller and the wiring terminal P3 is the output of the control circuit) under the condition of insufficient driving capability is effectively solved.

2) The relay coil feedback protection circuit effectively protects components in the circuit and prolongs the service life of the circuit.

3) The utility model has simple structure and accurately displays the working state of the circuit and the working state of each loop through the light-emitting diode.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

Fig. 1 is a schematic diagram of an optocoupler isolation fet output circuit according to one embodiment of the utility model.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

The following disclosure provides many different embodiments, or examples, for implementing different structures of the utility model. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the utility model. Furthermore, the present utility model may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present utility model provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the applicability of other processes and/or the use of other materials.

An optocoupler isolation fet output circuit according to an embodiment of the present utility model is described below with reference to fig. 1, and includes a voltage input circuit, an input signal detection circuit, and an input signal isolation feedback circuit, with which an input voltage is electrically connected, respectively.

The voltage input circuit comprises a wiring terminal P1, a wiring terminal P2 and a wiring terminal P3, wherein a pin 1 of the wiring terminal P2 is grounded, and a pin 2 of the wiring terminal P2 is connected with a power supply VCC; the input signal detection circuit comprises a resistor R4 and a diode LED1, wherein one end of the resistor R4 is connected with a No. 2 pin of the wiring terminal P2, and the other end of the resistor R4 is connected with a No. 1 pin of the wiring terminal P2 through the diode LED 1. When the LED lamp works, the LED1 works normally when the correct voltage is input, namely the LED1 emits green light, and the LED1 does not work when the incorrect voltage is input, namely the LED1 does not emit light. The light emitting diode LED1 is used as a working indicator lamp to display the working state of the whole circuit.

The input signal isolation feedback circuit comprises an optocoupler isolation circuit and a relay coil feedback protection circuit, wherein the optocoupler isolation circuit comprises an optocoupler isolator U1, an optocoupler isolator U2, a resistor R1, a resistor R3, a resistor R5, a resistor R7, a resistor R9 and a resistor R10, a pin 1 of the optocoupler isolator U1 is connected with a pin 4 of a wiring terminal P1 through the resistor R1, a pin 2 of the optocoupler isolator U1 is connected with a pin 3 of the wiring terminal P1, a pin 3 of the optocoupler isolator U1 is connected with a pin 1 of the wiring terminal P2 through the resistor R3 and the resistor R5, and a pin 4 of the optocoupler isolator U1 is connected with a pin 2 of the wiring terminal P2; the pin 1 of the optocoupler isolator U2 is connected with the pin 2 of the wiring terminal P2 through a resistor R7, the pin 2 of the optocoupler isolator U2 is connected with the pin 1 of the wiring terminal P1, the pin 3 of the optocoupler isolator U2 is connected with the pin 1 of the wiring terminal P2 through a resistor R9 and a resistor R10, and the pin 4 of the optocoupler isolator U2 is connected with the pin 2 of the wiring terminal P2;

the relay coil feedback protection circuit comprises a Light Emitting Diode (LED) 2, a Light Emitting Diode (LED) 3, a field effect tube Q1 and a field effect tube Q2, wherein a grid G of the field effect tube Q1 is connected to a circuit between a resistor R3 and a resistor R5, a source S of the field effect tube Q is connected with a pin 1 of a wiring terminal P2 through the LED2 and a resistor R6, and a drain D of the field effect tube Q1 is connected with a power supply VCC through the resistor R2; the grid electrode G of the field effect tube Q2 is connected to a circuit between the resistor R9 and the resistor R10, the source electrode S of the field effect tube Q2 is connected with the No. 1 pin of the wiring terminal P2 through the light emitting diode LED3 and the resistor R11, and the drain electrode D of the field effect tube Q2 is connected with the No. 2 pin of the wiring terminal P2 through the resistor R8; the pin 1 of the wiring terminal P3 is connected with the source S of the field effect transistor Q1, the pins 2 and 3 are connected with the pin 1 of the wiring terminal P2, and the pin 4 is connected with the source S of the field effect transistor Q2. The wiring terminal P1 and the wiring terminal P3 are respectively externally connected to the wiring terminals, the wiring terminal P1 is a controller input, and the wiring terminal P3 is a controller output for providing power for a load.

In the embodiment, the field effect transistors Q1 and Q2 are control switches, which are equivalent to relays, the resistor R2 connected in series with the drain electrode D of the field effect transistor Q1 and the resistor R8 connected in series with the drain electrode D of the field effect transistor Q2 are pull-up resistors, when the field effect transistors Q1 and Q2 are turned off, the output voltage is pulled up to the high level of the power supply VCC, the resistor R3 connected in series with the gate electrode G of the field effect transistor Q1 and the resistor R9 connected in series with the gate electrode G of the field effect transistor Q2 are limiting resistors, so that the situation that the gate electrode G currents of the field effect transistors Q1 and Q2 are excessive to damage the field effect transistors Q1 and Q2 at the moment of input voltage conversion is effectively prevented, and the pull-down resistors R5 and the resistor R10 are used for ensuring that the field effect transistors Q1 and Q2 are in a cut-off state when no input signals (suspended) are effectively protected.

When the circuit normally operates, a control signal is input into the wiring terminal P1, 12V voltage is input into the pin 4, 0V voltage is input into the pin 3, the optocoupler isolator U1 works, the resistor R3 and the resistor R5 generate voltage through current, the grid electrode G of the field effect tube Q1 is conducted, meanwhile, the light emitting diode LED2 works, light is emitted, the path of the field effect tube Q1 is displayed, at the moment, the wiring terminal P3 is connected with the VCC to output corresponding voltage, and the load is electrified to operate. The working state of the circuit channel where the field effect transistor Q1 is can be intuitively detected by a worker through the light emitting diode LED 2.

When the circuit normally operates, a control signal is input into the wiring terminal P1, a 12V voltage is input into the pin 2, a 0V voltage is input into the pin 1, the optocoupler isolator U2 works, the resistor R9 and the resistor R10 pass through current, the grid G of the field effect tube Q2 generates voltage, the field effect tube Q2 is conducted, meanwhile, the light emitting diode LED3 works and emits light, the channel of the field effect tube Q2 is displayed, at the moment, 12V or 24V level is output by the wiring terminal P3, the field effect tube Q2 is conducted, and the wiring terminal P3 is connected with the VCC to output corresponding voltage. The working state of the circuit channel where the field effect transistor Q2 is can be intuitively detected by a worker through the light emitting diode LED 3.

In this embodiment, two paths of input signal isolation feedback circuits are adopted, the first path of input signal isolation feedback circuit includes an opto-coupler isolator U1, a resistor R2, a resistor R3, a resistor R5, a resistor R6, a field effect transistor Q1 and a light emitting diode LED2, the second path of input signal isolation feedback circuit includes an opto-coupler isolator U2, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a field effect transistor Q2 and a light emitting diode LED3, the two paths of circuits have the same working principle, the second path of circuit is used as a topology circuit, multiple paths of circuit channels can be added in practical application to perform a multi-channel network topology, if a circuit channel with more paths is needed, corresponding connection terminals, such as four paths of input signal isolation feedback circuits, the connection terminals P1 and P3 need to have 8 pins.

The utility model adopts the optocoupler isolators U1 and U2 to isolate the signal loop from the power supply loop, thereby guaranteeing the stability of the input signal, isolating the signal loop from the power supply loop, avoiding the interference of the input signal, and simultaneously effectively solving the problem that the controller has insufficient driving capability to control the relay output (the optocoupler isolators U1 and U2 are equivalent to relays). Meanwhile, the relay coil feedback protection circuit effectively protects the stability of circuit operation and components in the circuit.

Other configurations of an optocoupler isolator fet output circuit, such as optocoupler isolators and fets, and operation thereof, in accordance with embodiments of the present utility model are known to those of ordinary skill in the art and will not be described in detail herein.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (6)

1. The optocoupler isolation field effect transistor output circuit is characterized by comprising a voltage input circuit, an input signal detection circuit and an input signal isolation feedback circuit, wherein the voltage input circuit is electrically connected with the input signal detection circuit and the input signal isolation feedback circuit respectively.

2. The optocoupler isolation fet output circuit of claim 1 wherein the voltage input circuit comprises a terminal P1, a terminal P2, a terminal P3, wherein pin 1 of the terminal P2 is grounded and pin 2 is connected to a power source VCC;

the input signal isolation feedback circuit comprises an optical coupling isolation circuit and a relay coil feedback protection circuit; the optocoupler isolation circuit comprises an optocoupler isolator U1, a resistor R3 and a resistor R5, wherein a pin 1 of the optocoupler isolator U1 is connected with a pin 4 of the wiring terminal P1 through the resistor R1, a pin 2 of the optocoupler isolator U1 is connected with a pin 3 of the wiring terminal P1, a pin 3 of the optocoupler isolator U1 is connected with a pin 1 of the wiring terminal P2 through the resistor R3 and the resistor R5, and a pin 4 of the optocoupler isolator U1 is connected with a pin 2 of the wiring terminal P2;

the relay coil feedback protection circuit comprises a resistor R2, a resistor R6, a light emitting diode LED2 and a field effect tube Q1, wherein a grid G of the field effect tube Q1 is connected to a circuit between the resistor R3 and the resistor R5, a source S of the field effect tube Q is connected with a No. 1 pin of the wiring terminal P2 through the light emitting diode LED2 and the resistor R6, and a drain D of the field effect tube Q1 is connected with a No. 2 pin of the wiring terminal P2 through the resistor R2; and a pin 1 of the wiring terminal P3 is connected with the source electrode of the field effect transistor Q1, and a pin 2 of the wiring terminal P2 is connected with a pin 1 of the wiring terminal P2.

3. The output circuit of claim 2, wherein the optocoupler isolation circuit further comprises an optocoupler isolator U2, a resistor R7, a resistor R9, and a resistor R10, pin 1 of the optocoupler isolator U2 is connected to pin 2 of the connection terminal P2 through the resistor R7, pin 2 of the optocoupler isolator U2 is connected to pin 1 of the connection terminal P1, pin 3 of the optocoupler isolator U2 is connected to pin 1 of the connection terminal P2 through the resistor R9 and the resistor R10, and pin 4 of the optocoupler isolator U2 is connected to pin 2 of the connection terminal P2.

4. The optocoupler isolation fet output circuit of claim 3, wherein the relay coil feedback protection circuit further comprises resistor R8, resistor R11, light emitting diode LED3, and fet Q2; the grid electrode G of the field effect tube Q2 is connected to a circuit between a resistor R9 and a resistor R10, the source electrode S of the field effect tube Q2 is connected with the No. 1 pin of the wiring terminal P2 through a light emitting diode LED3 and a resistor R11, and the drain electrode D of the field effect tube Q2 is connected with the No. 2 pin of the wiring terminal P2 through a resistor R8; the pin 1 of the wiring terminal P3 is connected with the source S of the field effect transistor Q1, the pins 2 and 3 are connected with the pin 1 of the wiring terminal P2, and the pin 4 is connected with the source S of the field effect transistor Q2.

5. The optocoupler isolation fet output circuit of claim 2 wherein the input signal detection circuit comprises a resistor R4 and a diode LED1, wherein one end of the resistor R4 is connected to pin 2 of the terminal P2, and the other end is connected to pin 1 of the terminal P2 through the diode LED 1.

6. The optocoupler isolation fet output circuit of claim 4, wherein the optocoupler isolator U1 and the optocoupler isolator U2 are model numbers APY210TX and the fet Q1 and the fet Q2 are model numbers 50N10.