CN217985023U - Switching value processing circuit - Google Patents

Abstract

The application provides a switching value processing circuit, includes: the device comprises a voltage stabilizing module, an isolating module and a shaping module; the voltage stabilizing module is connected with an external input and the input end of the isolating module, and is used for outputting the received switching value signal to the isolating module after voltage stabilizing processing is carried out on the received switching value signal; the output end of the isolation module is connected with the input end of the shaping module, and the isolation module is used for transmitting the switching value signal output by the voltage stabilizing module to the shaping module in an isolation coupling mode; and the shaping module is used for shaping the switching value signal output by the isolation module and then outputting the signal. The current input into the isolation module is limited through the voltage stabilizing module, the electrical isolation between the input side circuit and the output side circuit is realized through the isolation module, and the pulse is stably output through the shaping module, so that the stability of signals is improved, and the burning loss of internal devices of a microcomputer system caused by overvoltage is prevented.

Description

Switching value processing circuit

Technical Field

The present application relates to electronic circuit technologies, and in particular, to a switching value processing circuit.

Background

In the field of electric locomotives, locomotive operators usually need to start or stop the locomotive by controlling a master switching element, and during the operation of the locomotive, other control tasks may be required to relate to the switching value. Taking the master switch as an example, a locomotive driver can drive the master switch element through a button, a handle and other controllers to send out a switching value signal, and the signal is connected to a microcomputer system through a processing circuit. According to the type of the locomotive, the amplitude of a command switch signal of the locomotive is usually 110V/0V or 24V/0V of direct current, and if faults such as overvoltage occur and the like, the signal amplitude is greatly increased when a switching value is conducted. The processing circuit will output higher voltage at the microcomputer side, and the endurance value of the microcomputer control system is exceeded, so that the burning of internal components is caused. In addition, during the operation, there may be a case that the switching state needs to be frequently switched, and at this time, a high-frequency switching value square wave pulse is output, which also affects the stability of the signal received by the microcomputer control system.

There is a need for a switching value processing circuit to improve the stability of the output signal and prevent the over-voltage phenomenon from burning the components of the microcomputer control system.

SUMMERY OF THE UTILITY MODEL

The application provides a switching value processing circuit to improve the stability of an output signal, protect a microcomputer control system and prevent elements of the microcomputer control system from being burnt by an overvoltage phenomenon.

The application provides a switching value processing circuit, includes: the device comprises a voltage stabilizing module, an isolating module and a shaping module; wherein the content of the first and second substances,

the voltage stabilizing module is connected with an external input and the input end of the isolating module, and is used for outputting the received switching value signal to the isolating module after voltage stabilizing processing is carried out on the received switching value signal;

the output end of the isolation module is connected with the input end of the shaping module, and the isolation module is used for transmitting the switching value signal output by the voltage stabilizing module to the shaping module in an isolation coupling mode;

and the shaping module is used for shaping the switching value signal output by the isolation module and then outputting the signal.

Optionally, the voltage stabilizing module includes: a voltage regulator diode;

the cathode of the voltage stabilizing diode is connected with the external input, and the anode of the voltage stabilizing diode is connected with the input end of the isolation module.

Optionally, the voltage stabilizing module includes: a voltage comparator;

the voltage comparator includes: the circuit comprises a first operational amplifier, a first resistor and a second resistor;

a first input end of the first operational amplifier is connected with the external input, a second input end of the first operational amplifier is connected with a first end of the first resistor, a second end of the first resistor is connected with a standard voltage, and the voltage value of the standard voltage is the voltage value of the working voltage of the isolation module;

the first power supply end of the first operational amplifier is connected with a first power supply voltage, the second power supply end of the first operational amplifier is connected with a second power supply voltage, the first end of the second resistor is connected with the first power supply end of the first operational amplifier, and the second end of the second resistor is connected with the input end of the isolation module.

Optionally, the isolation module includes: a photoelectric coupler;

the input end of the photoelectric coupler comprises a first input end and a second input end, and the output end of the photoelectric coupler comprises a first output end and a second output end;

the voltage stabilizing module is connected with a first input end of the photoelectric coupler, and a second input end of the photoelectric coupler is grounded; the shaping module is connected with a first output end of the photoelectric coupler, and a second output end of the photoelectric coupler is grounded.

Optionally, the photocoupler includes: a light emitting diode and a photo transistor;

the anode of the light emitting diode is the first input end of the photoelectric coupler, and the cathode of the light emitting diode is the second input end of the photoelectric coupler;

the first end of the phototriode is the first output end of the photoelectric coupler and is connected with the first power supply voltage, the second end of the phototriode is used as the second output end of the photoelectric coupler, and the driving end of the phototriode is used for receiving an optical signal sent by the conduction of the light emitting diode so as to output the optical signal.

Optionally, the voltage stabilizing module further includes: the third resistor is positioned between the second input end of the photoelectric coupler and the ground;

and the first end of the third resistor is connected with the second input end of the photoelectric coupler, and the second end of the third resistor is grounded.

Optionally, the switching value processing circuit further includes: a fourth resistor;

the first end of the fourth resistor is connected with the input ends of the voltage stabilizing module and the isolating module, and the second end of the fourth resistor is grounded.

Optionally, the switching value processing circuit further includes: a first capacitor;

the first end of the first capacitor is connected with the external input, and the second end of the first capacitor is grounded.

Optionally, the shaping module includes: a Schmitt trigger and a fifth resistor;

the input end of the Schmitt trigger serves as the input end of the shaping module and is connected with the output end of the isolation module and the first end of the fifth resistor, the output end of the Schmitt trigger serves as the output end of the shaping module, and the second end of the fifth resistor is grounded.

Optionally, the shaping module further includes: a sixth resistor;

the first end of the sixth resistor is connected with the first end of the fifth resistor, and the second end of the sixth resistor is connected with the input end of the Schmitt trigger.

Optionally, the shaping module further includes: a second capacitor;

the first end of the second capacitor is connected with the input end of the Schmitt trigger, and the second end of the second capacitor is grounded.

Optionally, the shaping module further includes: a third capacitor;

and a first end of the third capacitor is connected with the first power supply voltage, and a second end of the third capacitor is connected with a second end of the fifth resistor.

Optionally, the switching value processing circuit further includes: an amplifying module;

the input end of the amplifying module is connected with the output end of the shaping module, and the amplifying module is used for amplifying the switching value signal output by the shaping module according to a set amplification coefficient and then outputting the amplified switching value signal.

Optionally, the amplifying module includes: a voltage follower;

the voltage follower includes: the second operational amplifier, the seventh resistor and the eighth resistor;

a first input end of the second operational amplifier is connected with an output end of the shaping module, a second input end of the second operational amplifier is connected with a first end of the seventh resistor and a first end of the eighth resistor, a first power supply end of the second operational amplifier is connected with a first power supply voltage, and a second power supply end of the second operational amplifier is grounded;

the second end of the seventh resistor is grounded, and the second end of the eighth resistor is connected with the output end of the second operational amplifier.

The application provides a switching value processing circuit, includes: the device comprises a voltage stabilizing module, an isolating module and a shaping module; the voltage stabilizing module is connected with an external input and the input end of the isolating module, and is used for outputting the received switching value signal to the isolating module after voltage stabilizing processing is carried out on the received switching value signal; the output end of the isolation module is connected with the input end of the shaping module, and the isolation module is used for transmitting the switching value signal output by the voltage stabilizing module to the shaping module in an isolation coupling mode; and the shaping module is used for shaping the switching value signal output by the isolation module and then outputting the signal. The current input into the isolation module is limited by the voltage stabilizing module, the isolation module is used for realizing the electrical isolation between the input side circuit and the output side circuit, and the shaping module is used for stabilizing the output pulse, so that the signal stability is improved, and the burning loss of internal devices of a microcomputer system caused by overvoltage is prevented.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application.

FIG. 1 is a schematic diagram of an application scenario provided by an example of the present application;

fig. 2 is a schematic structural diagram of a switching value processing circuit according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of another switching value processing circuit according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a switching value processing circuit according to a second embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of a switching value processing circuit according to a third embodiment of the present application;

fig. 6 is a schematic structural diagram of a switching value processing circuit according to a fourth embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of another switching value processing circuit according to the fourth embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of another switching value processing circuit according to the fourth embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of another switching value processing circuit according to the fourth embodiment of the present application;

fig. 10 is a schematic structural diagram of another switching value processing circuit according to a fifth embodiment of the present disclosure;

fig. 11 is a schematic structural diagram of another switching value processing circuit according to a fifth embodiment of the present disclosure;

fig. 12 is a schematic structural diagram of another switching value processing circuit according to a fifth embodiment of the present disclosure;

fig. 13 is a schematic structural diagram of another switching value processing circuit according to the fifth embodiment of the present application;

fig. 14 is a schematic structural diagram of a switching value processing circuit according to a sixth embodiment of the present application;

fig. 15 is a schematic structural diagram of another switching value processing circuit according to a sixth embodiment of the present application.

Description of reference numerals:

1001: a microcomputer control system;

1002: a processing circuit;

1003: a button;

1004: a handle;

11: a voltage stabilization module;

12: an isolation module;

13: a shaping module;

101: a first capacitor;

201: a voltage regulator diode;

301: a first resistor;

302: a second resistor;

303: a first operational amplifier;

401: a photoelectric coupler;

402: a light emitting diode;

403: a photo transistor;

404: a third resistor;

405: a fourth resistor;

501: a Schmitt trigger;

502: a fifth resistor;

503: a sixth resistor;

504: a second capacitor;

505: a third capacitor;

61: an amplifying module;

601: a seventh resistor;

602: an eighth resistor;

603: a second operational amplifier.

With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. The drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the concepts of the application by those skilled in the art with reference to specific embodiments.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

Fig. 1 is a schematic view of an application scenario provided by an example of the present application, as shown in fig. 1, in the field of electric locomotives, a locomotive driver operates a series of buttons or handles, transmits a switching value command to a microcomputer control system for driving or stopping the locomotive, and controls corresponding facilities on the locomotive, covering various control tasks in the driving process, wherein a master switch is a main device for sending a switching value control signal when the locomotive runs, and the master switch may be in the form of a button or a handle, depending on the model of the locomotive. In the figure, 1001 is a microcomputer control system, 1002 is a processing circuit, 1003 is a button on a console, and 1004 is a handle. Wherein the buttons 1003 provided on the console are configured as master switches. Taking the master switch as an example, the locomotive driver can drive the master switch to send out a switching value control signal through the state of the switch button 1003, the signal is connected to the microcomputer system through the processing circuit, and the amplitude of the switching value control signal sent out by the master switch of the locomotive is usually 110V/0V or 24V/0V of direct current. The processing circuit is used for converting the control signal sent by the master switch into a weak current signal of 5V/0V and sending the weak current signal to the microcontroller.

It should be noted that, in a locomotive control system, an overvoltage generally refers to an abnormal rise of a control signal voltage amplitude in a short time due to an operation or a circuit fault, and since a master switch needs to switch an operating state at a high frequency during operation, an overvoltage generally refers to an abnormal rise of a master switch signal in a switching process. If an overvoltage fault occurs when the master switch signal is switched from off to on, the signal amplitude is greatly increased, and the processing circuit correspondingly outputs higher voltage at the microcomputer side, which may exceed the tolerance value of the microcomputer control system to cause burning of internal elements. The situation that the voltage is too low usually does not occur in a switching value input system of the locomotive, and if the situation that the voltage is too low occurs, the situation is considered to be an interference signal from other electrical systems or a reverse electromotive force generated by turning off a sensitive load in a circuit. The present application relates generally to scenarios of abnormally elevated voltages. In addition, the high frequency switching of the master switch state may cause the problem of unstable signals when the signals are input into the microcomputer control system, thereby causing the microcomputer control system to recognize the master switch state incorrectly.

The conventional processing circuit is generally provided with only an amplitude conversion function and an isolation function of two loops of a switching value input side and a switching value output side, so that when voltage fluctuation or interference occurs, it is difficult to output switching value pulses with stable amplitudes, and if the switching value involves high frequency, a larger malfunction risk is caused. Therefore, a switching value processing circuit is needed, which can improve the stability of output signals and prevent the microcomputer control system elements from being burnt due to faults such as overvoltage and the like on the basis of meeting the level conversion function.

The technical means of the present application and the technical means of the present application will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. In the description of the present application, unless otherwise explicitly specified and defined, each term should be understood broadly in the art. Embodiments of the present application will be described below with reference to the accompanying drawings.

Example one

Fig. 2 is a schematic structural diagram of a switching value processing circuit according to an embodiment of the present application, and as shown in fig. 2, the switching value processing circuit includes: a voltage stabilizing module 11, an isolating module 12 and a shaping module 13; wherein, the first and the second end of the pipe are connected with each other,

the voltage stabilizing module 11 is connected with an external input and an input end of the isolating module 12, and the voltage stabilizing module 11 is used for performing voltage stabilizing processing on the received switching value signal and outputting the switching value signal to the isolating module 12;

the output end of the isolation module 12 is connected with the input end of the shaping module 13, and the isolation module 12 is used for transmitting the switching value signal output by the voltage stabilizing module 11 to the shaping module 13 in an isolation coupling mode;

the shaping module 13 is configured to shape the switching value signal output by the isolation module 12 and output the shaped switching value signal.

The present embodiment is exemplarily explained with reference to specific application scenarios: for a switching value with a large amplitude, the switching value needs to be processed and then input into a microcomputer system, vin shown in fig. 2 is a switching value input, generally, after a driver operates a master switch element, vin generates a signal change, vout is an output of a processing circuit, and is generally connected to a microprocessor inside a locomotive. The voltage stabilizing module can ensure that the isolation module and the following components are not burnt by limiting the current input into the isolation module; the isolation module is used for realizing the electrical isolation between the input side circuit and the output side circuit; the shaping module can stabilize output pulse through signal conversion, limit the amplitude of output voltage, improve the stability of signal, and further prevent the burning loss of internal devices of the microcomputer system caused by overvoltage phenomenon.

Specifically, the switching value processing circuit provided in this embodiment includes: the voltage stabilizing module 11, the isolation module 12 and the shaping module 13; the voltage stabilizing module 11 is connected to an external input and an input end of the isolation module 12, the voltage stabilizing module 11 is used for performing voltage stabilizing processing on the received switching value signal and outputting the switching value signal to the isolation module 12, and a voltage stabilizing value is related to a tolerance value of an isolation module component and needs to ensure that the isolation module is not burnt; the output end of the isolation module 12 is connected with the input end of the shaping module 13, and the isolation module 12 is used for transmitting the switching value signal output by the voltage stabilizing module 11 to the shaping module 13 in an isolation coupling mode, so as to ensure the electrical isolation of the front loop and the rear loop of the isolation module; the shaping module 13 is configured to output a stable switching value pulse with a fixed amplitude after shaping the switching value signal output by the isolation module 12.

Fig. 3 is a schematic structural diagram of another switching value processing circuit provided in an embodiment of the present application, and as shown in fig. 3, the switching value processing circuit further includes: a first capacitor 101;

a first terminal of the first capacitor 101 is connected to the external input and a second terminal of the first capacitor 101 is connected to ground.

The first capacitor is mainly used for filtering, a locomotive driver sends out external input through a control button or a handle, however, the external input often has certain disturbance or alternating current interference caused by electronic devices, and therefore before the switching value is input into the processing circuit, the grounded capacitor can filter the disturbance to reduce the disturbance and improve the quality of signals.

The present embodiment provides a switching value processing circuit, including: the device comprises a voltage stabilizing module, an isolating module and a shaping module; the voltage stabilizing module is connected with an external input and the input end of the isolating module, and is used for outputting the received switching value signal to the isolating module after voltage stabilizing processing is carried out on the received switching value signal; the output end of the isolation module is connected with the input end of the shaping module, and the isolation module is used for transmitting the switching value signal output by the voltage stabilizing module to the shaping module in an isolation coupling mode; and the shaping module is used for shaping the switching value signal output by the isolation module and then outputting the signal. The current input into the isolation module is limited through the voltage stabilizing module, the electrical isolation between the input side circuit and the output side circuit is realized through the isolation module, and the pulse is stably output through the shaping module, so that the stability of signals is improved, and the burning loss of internal devices of a microcomputer system caused by overvoltage is prevented.

Example two

Fig. 4 is a schematic structural diagram of a switching value processing circuit provided in the second embodiment of the present application, and as shown in fig. 4, on the basis of any embodiment, the voltage stabilizing module 11 includes: a zener diode 201;

the cathode of the zener diode 201 is connected to the external input, and the anode of the zener diode 201 is connected to the input terminal of the isolation module 12.

The present embodiment is exemplarily described with reference to specific application scenarios: the voltage stabilizing diode is used for limiting the current input into the isolation module, ensures the conduction of the isolation module and cannot be burnt due to overlarge current. In addition, the voltage stabilizing diode can also filter small interference voltage to prevent the malfunction of a subsequent circuit. The reverse breakdown voltage of the zener diode is the main parameter, all signals below this voltage will be filtered and cannot be conducted to the isolation module and the following circuits, and when the external input is greater than this voltage, the zener diode can be conducted, and then the isolation module is driven to work.

The zener diode needs to be connected in series with the input signal and in reverse, specifically, as shown in the figure, the cathode of the zener diode 201 is connected to the external input, and the anode of the zener diode 201 is connected to the input end of the isolation module 12. By changing the type of the voltage stabilizing diode, the voltage value of the input limit can be changed, and the voltage value depends on the amplitude of the switching value of the locomotive system. One possible reverse breakdown voltage is 9.1V, which ensures that disturbances below 9.1V are filtered and that a switching value of 110V or 24V will respond correctly when turned on.

This embodiment provides a concrete structure of voltage regulator module, includes: a voltage regulator diode; the cathode of the voltage stabilizing diode is connected with the external input, and the anode of the voltage stabilizing diode is connected with the input end of the isolation module. The voltage stabilizing diode is reversely connected in series between the external input module and the isolation module, so that the correct response of the switching value can be ensured, and the misoperation caused by micro interference can be prevented.

EXAMPLE III

Fig. 5 is a schematic structural diagram of a switching value processing circuit provided in a third embodiment of the present application, and as shown in fig. 5, on the basis of any embodiment, a voltage stabilizing module 11 includes: a voltage comparator;

the voltage comparator includes: a first operational amplifier 303, a first resistor 301, and a second resistor 302;

a first input end of the first operational amplifier 303 is connected to the external input, a second input end of the first operational amplifier 303 is connected to a first end of the first resistor 301, a second end of the first resistor 301 is connected to a standard voltage, and a voltage value of the standard voltage is a voltage value of a working voltage of the isolation module;

a first power supply terminal of the first operational amplifier 303 is connected to a first power supply voltage, a second power supply terminal of the first operational amplifier 303 is connected to a second power supply voltage, a first terminal of the second resistor 302 is connected to the first power supply terminal of the first operational amplifier 303, and a second terminal of the second resistor 302 is connected to an input terminal of the isolation module 12.

The present embodiment is exemplarily described with reference to specific application scenarios: the circuit structure provided by this embodiment can also achieve the effect similar to that of the zener diode in the second embodiment, but the circuit structure is relatively more complex than the scheme of directly using the zener diode. Specifically, the voltage stabilizing module 11 may include: a voltage comparator; the voltage comparator includes: a first operational amplifier 303, a first resistor 301, and a second resistor 302; the limitation of the conducting voltage is completed through the operational amplifier and the peripheral circuit thereof, and meanwhile, the tiny interference is filtered. A first input end of the first operational amplifier 303 is connected to the external input, a second input end of the first operational amplifier 303 is connected to a first end of the first resistor 301, a second end of the first resistor 301 is connected to a standard voltage, and a voltage value of the standard voltage is a voltage value of a working voltage of the isolation module; the first input terminal is usually a non-inverting input terminal, and the second input terminal is usually an inverting input terminal, so as to simplify the structure of the circuit.

The standard voltage is a voltage to be controlled by the voltage comparison module, and in the aforementioned zener diode scheme, the standard voltage can be understood as a reverse breakdown voltage of the zener diode, so as to limit interference below the value and ensure that signals above the value can be smoothly conducted. A first power supply terminal of the first operational amplifier 303 is connected to a first power supply voltage, a second power supply terminal of the first operational amplifier 303 is connected to a second power supply voltage, a first terminal of the second resistor 302 is connected to the first power supply terminal of the first operational amplifier 303, and a second terminal of the second resistor 302 is connected to an input terminal of the isolation module 12. The first operational amplifier can be powered by VCC and-VCC, the first resistor is a current-limiting resistor connected with a comparison voltage, the second resistor is a pull-up resistor for output, and in addition, the circuit can also be designed with other peripheral circuits such as a voltage-dividing resistor, a feedback resistor and the like so as to realize further amplification and other functions.

This embodiment provides a concrete structure of voltage stabilizing module, voltage stabilizing module includes: a voltage comparator; the voltage comparator includes: the circuit comprises a first operational amplifier, a first resistor and a second resistor; a first input end of the first operational amplifier is connected with the external input, a second input end of the first operational amplifier is connected with a first end of the first resistor, a second end of the first resistor is connected with a standard voltage, and the voltage value of the standard voltage is the voltage value of the working voltage of the isolation module; the first power supply end of the first operational amplifier is connected with a first power supply voltage, the second power supply end of the first operational amplifier is connected with a second power supply voltage, the first end of the second resistor is connected with the first power supply end of the first operational amplifier, and the second end of the second resistor is connected with the input end of the isolation module. Through the voltage comparator, the comparison between the external input voltage and the comparison voltage can be completed, the isolation module is driven when the external input voltage is higher than the comparison voltage, and the false action caused by micro-interference is prevented.

Example four

Fig. 6 is a schematic structural diagram of a switching value processing circuit according to a fourth embodiment of the present application, and as shown in fig. 6, on the basis of any embodiment, the isolation module 12 includes: a photocoupler 401;

the input end of the photoelectric coupler 401 comprises a first input end and a second input end, and the output end of the photoelectric coupler 401 comprises a first output end and a second output end;

the voltage stabilizing module 11 is connected with a first input end of a photoelectric coupler 401, and a second input end of the photoelectric coupler 401 is grounded; the shaping module 13 is connected to a first output terminal of the photoelectric coupler 401, and a second output terminal of the photoelectric coupler 401 is grounded.

The present embodiment is exemplarily described with reference to specific application scenarios: the isolation module is used for realizing the electrical isolation of circuits on two sides, but needs to smoothly transmit a driving signal, and the function can be realized through a photoelectric coupler, and generally, the photoelectric coupler consists of a light emitting diode and a phototriode. The input end of the photoelectric coupler comprises a first input end and a second input end, and the output end of the photoelectric coupler comprises a first output end and a second output end; the voltage stabilizing module is connected with a first input end of the photoelectric coupler, and a second input end of the photoelectric coupler is grounded; the shaping module is connected with a first output end of the photoelectric coupler, and a second output end of the photoelectric coupler is grounded.

For an example, fig. 7 is a schematic structural diagram of another switching value processing circuit provided in the fourth embodiment of the present application, and as shown in fig. 7, a photocoupler 401 includes: a light emitting diode 402 and a phototransistor 403;

the anode of the light emitting diode 402 is a first input end of the photoelectric coupler 401, and the cathode of the light emitting diode 402 is a second input end of the photoelectric coupler 401;

a first end of the phototransistor 403 is a first output end of the photocoupler 401 and is connected to the first power supply voltage, a second end of the phototransistor 403 is a second output end of the photocoupler 401, and a driving end of the phototransistor 403 is used for receiving an optical signal emitted by the led 402 to output.

The photoelectric coupler is generally a two-port module, transmits signals under the condition of realizing electrical isolation, the input end of the photoelectric coupler is a light emitting diode, the photoelectric coupler emits light when receiving the signal conduction of the voltage stabilizing module, the light signal can drive a phototriode on the output side, and the phototriode converts the light signal into an electric signal to be output. And signal transmission under the condition of electrical isolation is realized through the isolation coupling of the light emitting diode and the phototriode.

Fig. 8 is a schematic structural diagram of a further switching value processing circuit provided in the fourth embodiment of the present application, and as shown in fig. 8, the voltage stabilizing module further includes: a third resistor 404 between the second input terminal of the photocoupler 401 and ground;

a first end of the third resistor 404 is connected to the second input end of the photocoupler 401, and a second end of the third resistor 404 is grounded.

The third resistor is a divider resistor and is connected with the voltage stabilizing module and the photoelectric coupler in series, and the voltage applied by the voltage stabilizing module and the isolating module is limited in a voltage dividing mode so as to ensure that the voltage stabilizing module and the isolating module are not burnt.

Fig. 9 is a schematic structural diagram of another switching value processing circuit provided in the fourth embodiment of the present application, and as shown in fig. 9, the switching value processing circuit further includes: a fourth resistor 405;

a first end of the fourth resistor 405 is connected to the input ends of the voltage stabilizing module 11 and the isolation module 12, and a second end of the fourth resistor 405 is grounded.

The fourth resistance with keep apart module parallel connection, play the effect of reposition of redundant personnel, when keeping apart the module and being optoelectronic coupler, the first input of optoelectronic coupler is inserted to the first end of fourth resistance, through the current of shunting restriction inflow isolation module, prevent that the too big isolation module inner member that leads to of electric current from burning out.

It should be noted that, part or all of the embodiments provided in this embodiment may be implemented in combination.

Specifically, the third resistor and the fourth resistor may be set simultaneously, or only one of them may be left, and when the isolation module is the photoelectric coupler, if the first end of the fourth resistor is connected to the second input end of the photoelectric coupler, the fourth resistor is the third resistor in the foregoing embodiment, and the safety of the photoelectric coupler is ensured in a voltage division manner. When the first end of fourth resistance inserts optoelectronic coupler's first input, in this embodiment promptly, with optoelectronic coupler parallel connection to the safety of optoelectronic coupler is guaranteed to the mode of shunting, can be with the second end connection of fourth resistance optoelectronic coupler's second input realizes ground connection.

This embodiment provides a switching value processing circuit, and the isolation module includes: a photoelectric coupler; the input end of the photoelectric coupler comprises a first input end and a second input end, and the output end of the photoelectric coupler comprises a first output end and a second output end; the voltage stabilizing module is connected with a first input end of the photoelectric coupler, and a second input end of the photoelectric coupler is grounded; the shaping module is connected with a first output end of the photoelectric coupler, and a second output end of the photoelectric coupler is grounded. Through the isolation coupling of the photoelectric coupler, signal transmission under the condition of electrical isolation can be realized.

EXAMPLE five

Fig. 10 is a schematic structural diagram of a switching value processing circuit provided in the fifth embodiment of the present application, and as shown in fig. 10, on the basis of any embodiment, the shaping module 13 includes: a schmitt trigger 501 and a fifth resistor 502;

the input end of the schmitt trigger 501 is used as the input end of the shaping module 13, and is connected to the output end of the isolation module 12 and the first end of the fifth resistor 502, the output end of the schmitt trigger 501 is the output end of the shaping module 13, and the second end of the fifth resistor 502 is grounded.

The present embodiment is exemplarily described with reference to specific application scenarios: the Schmitt trigger is also called as a hysteresis comparator, and can realize the hysteresis characteristic of a signal through two voltage thresholds of the on-off of the Schmitt trigger, thereby preventing the interference of a smaller signal, and simultaneously realizing the shaping of square wave pulse and outputting stable switching value pulse.

Specifically, the shaping module 13 includes: a schmitt trigger 501 and a fifth resistor 502; the input end of the schmitt trigger 501 is used as the input end of the shaping module 13, and is connected to the output end of the isolation module 12 and the first end of the fifth resistor 502, the output end of the schmitt trigger 501 is the output end of the shaping module 13, and the second end of the fifth resistor 502 is grounded. The fifth resistor is a sampling resistor, and forms a circuit loop with the isolation module 12 after being grounded, and if the fifth resistor is removed, the input end of the shaping module 13 cannot collect voltage, so that the resistance value of the fifth resistor must be designed according to circuit parameters, and the square wave pulse signal shaped by the shaping module 13 is ensured to meet the amplitude requirement of a microcomputer control system.

Fig. 11 is a schematic structural diagram of another switching value processing circuit provided in the fifth embodiment of the present application, and as shown in fig. 11, the shaping module 13 further includes: a sixth resistor 503;

a first end of the sixth resistor 503 is connected to a first end of the fifth resistor 502, and a second end of the sixth resistor 503 is connected to an input terminal of the schmitt trigger 501.

The sixth resistor is connected in series with the output terminal of the isolation module 12 and the input terminal of the schmitt trigger 501, and can play a role in limiting the current flowing into the schmitt trigger and preventing subsequent elements from being burnt.

An example, fig. 12 is a schematic structural diagram of another switching value processing circuit provided in a fifth embodiment of the present application, and as shown in fig. 12, the shaping module 13 further includes: a second capacitor 504;

a first terminal of the second capacitor 504 is connected to the input terminal of the schmitt trigger 501, and a second terminal of the second capacitor 504 is grounded.

The second capacitor 504 is a filter capacitor, and the grounding can be realized by connecting the second end of the fifth resistor, so as to filter out the small interference before the signal is input into the schmitt trigger 501.

An example, fig. 13 is a schematic structural diagram of another switching value processing circuit provided in a fifth embodiment of the present application, and as shown in fig. 13, the shaping module 13 further includes: a third capacitor 505;

a first terminal of the third capacitor 505 is connected to the first supply voltage, and a second terminal of the third capacitor 505 is connected to a second terminal of the fifth resistor 502.

The third capacitor 505 is also a filter capacitor, and can be connected between the VCC power supply voltage of the system and the ground, so as to filter the small interference of the first power supply voltage and ensure the signal quality.

It should be noted that, part or all of the embodiments provided in this embodiment may be implemented in combination. Moreover, the schmitt trigger can also be implemented with hysteresis, shaping and anti-interference functions by multiple sets of voltage comparators, but the schmitt trigger is too complex compared with the schmitt trigger scheme, and is not described here again.

This embodiment provides a switching value processing circuit, and the shaping module includes: a Schmitt trigger and a fifth resistor; the input end of the Schmitt trigger serves as the input end of the shaping module and is connected with the output end of the isolation module and the first end of the fifth resistor, the output end of the Schmitt trigger serves as the output end of the shaping module, and the second end of the fifth resistor is grounded. The shaping of signals is completed through the hysteresis characteristic of the Schmitt trigger, meanwhile, tiny interference is avoided, and stable switching value square wave pulses are output.

EXAMPLE six

Fig. 14 is a schematic structural diagram of a switching value processing circuit provided in a sixth embodiment of the present application, and as shown in fig. 14, on the basis of any embodiment, the switching value processing circuit further includes: an amplification module 61;

the input end of the amplifying module 61 is connected to the output end of the shaping module 13, and the amplifying module 61 is configured to amplify the switching value signal output by the shaping module 13 according to a set amplification factor and output the amplified switching value signal.

The present embodiment is exemplarily described with reference to specific application scenarios: the amplifying module 61 can be used for realizing the scaling of the output signal, the input end is connected with the output end of the shaping module, the square wave pulse output by the shaping module is received, the corresponding amplifying coefficient is designed according to the requirement of the microcomputer control system, the amplitude is amplified, and the amplifying coefficient can be smaller than 1, so as to realize the scaling of the amplitude. Generally, the amplifying module can be realized in the form of a voltage follower, and other elements and amplifying circuits can be designed to realize the function.

Fig. 15 is a schematic structural diagram of another switching value processing circuit provided in a sixth embodiment of the present application, and as shown in fig. 15, the amplifying module includes: a voltage follower;

the voltage follower includes: a second operational amplifier 603, a seventh resistor 601, and an eighth resistor 602;

a first input end of the second operational amplifier 603 is connected to the output end of the shaping module 13, a second input end of the second operational amplifier 603 is connected to a first end of the seventh resistor 601 and a first end of the eighth resistor 602, a first power supply end of the second operational amplifier 603 is connected to a first power supply voltage, and a second power supply end of the second operational amplifier 603 is grounded;

a second terminal of the seventh resistor 601 is connected to ground, and a second terminal of the eighth resistor 602 is connected to an output terminal of the second operational amplifier 603.

The voltage follower is an amplifying circuit formed by the operational amplifier and the peripheral circuits thereof, but the scheme provided by fig. 15 can only realize the amplification of the amplitude, and if the reduction is needed, the design of the peripheral circuits should be re-performed to realize the amplification factor less than 1.

The seventh resistor is a sampling resistor, the eighth resistor is a feedback resistor, when the connection is performed according to the scheme shown in the figure, the amplification factor of the voltage follower is always larger than 1, the resistance value of the seventh resistor is R1, and the resistance value of the eighth resistor is R2, so that the voltage follower shown in the figure has the amplification factor of (1 + R2/R1) times, the amplification factor is used for amplifying the square wave pulse processed by the shaping module 13, and the voltage amplitude can be adaptively adjusted through the voltage follower, so that the voltage follower is suitable for different types of microcomputer control systems.

The present embodiment provides a switching value processing circuit, including: an amplifying module; the input end of the amplifying module is connected with the output end of the shaping module, and the amplifying module is used for amplifying the switching value signal output by the shaping module according to the set amplification coefficient and then outputting the signal. Through the series arrangement of the amplifying module circuit, square wave pulses of the shaping module can be amplified or reduced, and the amplitude of the output pulses of the circuit can be adjusted.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims (14)

1. A switching value processing circuit, comprising: the device comprises a voltage stabilizing module, an isolating module and a shaping module; wherein the content of the first and second substances,

the voltage stabilizing module is connected with an external input and the input end of the isolating module, and is used for outputting the received switching value signal to the isolating module after voltage stabilizing processing is carried out on the received switching value signal;

the output end of the isolation module is connected with the input end of the shaping module, and the isolation module is used for transmitting the switching value signal output by the voltage stabilizing module to the shaping module in an isolation coupling mode;

and the shaping module is used for shaping the switching value signal output by the isolation module and then outputting the signal.

2. The circuit of claim 1, wherein the voltage regulator module comprises: a voltage regulator diode;

the cathode of the voltage stabilizing diode is connected with the external input, and the anode of the voltage stabilizing diode is connected with the input end of the isolation module.

3. The circuit of claim 1, wherein the voltage regulator module comprises: a voltage comparator;

the voltage comparator includes: the circuit comprises a first operational amplifier, a first resistor and a second resistor;

a first input end of the first operational amplifier is connected with the external input, a second input end of the first operational amplifier is connected with a first end of the first resistor, a second end of the first resistor is connected with a standard voltage, and the voltage value of the standard voltage is the voltage value of the working voltage of the isolation module;

the first power supply end of the first operational amplifier is connected with a first power supply voltage, the second power supply end of the first operational amplifier is connected with a second power supply voltage, the first end of the second resistor is connected with the first power supply end of the first operational amplifier, and the second end of the second resistor is connected with the input end of the isolation module.

4. The circuit of claim 1, wherein the isolation module comprises: a photoelectric coupler;

the input end of the photoelectric coupler comprises a first input end and a second input end, and the output end of the photoelectric coupler comprises a first output end and a second output end;

the voltage stabilizing module is connected with a first input end of the photoelectric coupler, and a second input end of the photoelectric coupler is grounded; the shaping module is connected with a first output end of the photoelectric coupler, and a second output end of the photoelectric coupler is grounded.

5. The circuit of claim 4, wherein the optocoupler comprises: a light emitting diode and a photo transistor;

the anode of the light emitting diode is the first input end of the photoelectric coupler, and the cathode of the light emitting diode is the second input end of the photoelectric coupler;

the first end of the phototriode is the first output end of the photoelectric coupler and is connected with a first power supply voltage, the second end of the phototriode is the second output end of the photoelectric coupler, and the driving end of the phototriode is used for receiving an optical signal sent by the conduction of the light emitting diode so as to output the optical signal.

6. The circuit of claim 4, wherein the voltage regulator module further comprises: the third resistor is positioned between the second input end of the photoelectric coupler and the ground;

the first end of the third resistor is connected with the second input end of the photoelectric coupler, and the second end of the third resistor is grounded.

7. The circuit according to any one of claims 1 to 6, wherein the switching value processing circuit further comprises: a fourth resistor;

the first end of the fourth resistor is connected with the input ends of the voltage stabilizing module and the isolating module, and the second end of the fourth resistor is grounded.

8. The circuit according to any one of claims 1 to 6, wherein the switching value processing circuit further comprises: a first capacitor;

the first end of the first capacitor is connected with the external input, and the second end of the first capacitor is grounded.

9. The circuit of any of claims 1-6, wherein the shaping module comprises: a Schmitt trigger and a fifth resistor;

the input end of the Schmitt trigger serves as the input end of the shaping module and is connected with the output end of the isolation module and the first end of the fifth resistor, the output end of the Schmitt trigger serves as the output end of the shaping module, and the second end of the fifth resistor is grounded.

10. The circuit of claim 9, wherein the shaping module further comprises: a sixth resistor;

and the first end of the sixth resistor is connected with the first end of the fifth resistor, and the second end of the sixth resistor is connected with the input end of the Schmitt trigger.

11. The circuit of claim 9, wherein the shaping module further comprises: a second capacitor;

the first end of the second capacitor is connected with the input end of the Schmitt trigger, and the second end of the second capacitor is grounded.

12. The circuit of claim 9, wherein the shaping module further comprises: a third capacitor;

and a first end of the third capacitor is connected with a first power supply voltage, and a second end of the third capacitor is connected with a second end of the fifth resistor.

13. The circuit according to any one of claims 1 to 6, wherein the switching value processing circuit further comprises: an amplifying module;

the input end of the amplifying module is connected with the output end of the shaping module, and the amplifying module is used for amplifying the switching value signal output by the shaping module according to a set amplification coefficient and then outputting the amplified switching value signal.

14. The circuit of claim 13, wherein the amplification module comprises: a voltage follower; the voltage follower includes: the second operational amplifier, the seventh resistor and the eighth resistor;

a first input end of the second operational amplifier is connected with an output end of the shaping module, a second input end of the second operational amplifier is connected with a first end of the seventh resistor and a first end of the eighth resistor, a first power supply end of the second operational amplifier is connected with a first power supply voltage, and a second power supply end of the second operational amplifier is grounded;

the second end of the seventh resistor is grounded, and the second end of the eighth resistor is connected with the output end of the second operational amplifier.

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