Level conversion device based on control system

Abstract

The utility model provides a level conversion device based on a control system. The level conversion device comprises a level conversion module, a first input end, a second input end and a level output end, the first input end is connected to an external sensor, and the second input end is connected to external voltage output; the level output end outputs a high level signal; the first input end comprises a positive voltage input and a negative voltage input; the second input end comprises an anode and a cathode; the level conversion module comprises a signal generation circuit and a signal detection circuit; the signal generation circuit is connected in series between the anode and the cathode of the second input end; the signal detection circuit is connected in series between the positive voltage input and the negative voltage input of the first input end, and the output end of the signal detection circuit is a level output end. When the sensor is used by the control system, the voltage range of an electric signal output by the sensor does not need to be considered, and the problems that the performance of the control system is limited, the application range is narrow and the cost is difficult to control are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits, in particular to a level conversion device based on a control system. Background Art

[0002] A control system usually consists of at least three key parts: controller, actuator, and controlled object. Sensors can obtain the state of the controlled object and convert these states into electrical signals or other forms of information and output them to the controller, so that the controller can accurately control and process according to this information.

[0003] However, the control system also requires that the electrical signal output by the sensor be within a certain voltage range in order to be correctly identified. In actual application scenarios, if the sensor model is specifically selected according to the voltage range required by the control system, the control system may face problems such as limited performance, narrowed application scope, and difficult cost control. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a level conversion device based on a control system, which solves the problem in the prior art that when the control system uses a sensor, it is necessary to consider the voltage range of the electrical signal output by the sensor, thereby affecting the performance, scope of application and cost control of the control system.

[0005] According to an embodiment of the utility model, a level conversion device based on a control system includes a level conversion module, a first input terminal, a second input terminal, and a level output terminal;

[0006] The first input terminal is connected to an external sensor, and the second input terminal is connected to an external voltage output; the level output terminal outputs a high-level signal; wherein the control system provides the external voltage output, and the high-level signal is used for the control system to control an external device.

[0007] The first input terminal includes a positive voltage input and a negative voltage input; the second input terminal includes an anode and a cathode;

[0008] The level conversion module includes a signal generating circuit and a signal detecting circuit;

[0009] The signal generating circuit is connected in series between the anode and the cathode of the second input terminal;

[0010] The signal detection circuit is connected in series between the positive voltage input and the negative voltage input of the first input terminal, and the output terminal of the signal detection circuit is the level output terminal.

[0011] Optionally, the signal generating circuit includes a light emitting diode.

[0012] Optionally, the signal detection circuit includes a photodiode and a trigger;

[0013] The photosensitive diode detects the light intensity of the light emitting diode, and the trigger outputs a high level signal.

[0014] Optionally, the trigger includes an operational amplifier, a level trigger unit, a first triode and a second triode;

[0015] The power supply input terminal of the operational amplifier and the power supply input terminal of the level trigger unit are connected to the positive voltage input and the negative voltage input;

[0016] The output end of the photosensitive diode and the input end of the photosensitive diode are connected to the forward input end of the operational amplifier and the reverse input end of the operational amplifier respectively;

[0017] The input end of the level trigger unit is connected to the voltage output end of the operational amplifier, and the output end of the level trigger unit is connected to the gate of the first transistor and the gate of the second transistor respectively;

[0018] The drain of the first transistor is connected to the positive voltage input, the source of the first transistor is connected to the drain of the second transistor, and the source of the first transistor and the drain of the second transistor are connected to form the output end of the signal detection circuit; the second transistor is connected to the negative voltage input.

[0019] Optionally, a bypass capacitor and a first resistor are further provided between the positive voltage input and the negative voltage input;

[0020] One end of the bypass capacitor is connected to the positive voltage input, and the other end of the bypass capacitor is connected to the negative voltage input; the first resistor is connected between one end of the bypass capacitor and the positive voltage input.

[0021] Optionally, a normally closed contact terminal is also included.

[0022] Optionally, the second input terminal is further connected in series with a second resistor.

[0023] The technical principle of the utility model is: the level conversion module works after the first input terminal is connected to the external sensor and the second input terminal is connected to the external voltage output, and the level output terminal outputs a high-level signal. Among them, the control system provides an external voltage output, and the high-level signal is used as a control signal for the control system to control the external device. When the external voltage output can support the operation of the signal generating circuit in the level conversion module, and the signal detection circuit at the first input terminal is connected to the external sensor to form a loop, the level output terminal provided by the signal detection circuit outputs a high-level signal according to the signal sent by the external sensor.

[0024] Compared with the prior art, the utility model has the following beneficial effects: when the control system uses the sensor, there is no need to consider the voltage range of the electrical signal output by the sensor, thus overcoming the problems of limited performance, narrow application range and difficult cost control of the control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural diagram of a level conversion device based on a control system according to an embodiment of the utility model.

[0026] Figure 2 This is a circuit structure diagram of a level conversion device based on a control system according to another embodiment of the utility model.

[0027] In the above drawings: U1, level conversion module; U2, level trigger unit; 1, signal generating circuit; 2, signal detection circuit; S1, positive voltage input; S2, negative voltage input; S3, anode; S4, cathode; S5, level output terminal; S6, normally closed contact terminal. DETAILED DESCRIPTION

[0028] The technical solution of the present utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0029] See also Figure 1 The embodiment of the utility model proposes a level conversion device based on a control system, including a level conversion module U1, a first input terminal, a second input terminal, and a level output terminal based on the level conversion module U1. The first input terminal is connected to an external sensor, the second input terminal is connected to an external voltage output P_OUT, and the level output terminal outputs a high level signal.

[0030] Figure 1 The circuit structure of the level conversion module U1 shown includes a signal generating circuit 1 and a signal detecting circuit 2. In addition, the above-mentioned first input terminal includes a positive voltage input S1 and a negative voltage input S2; the second input terminal includes an anode S3 and a cathode S4. The relationship between the signal generating circuit 1 and the signal detecting circuit 2 and each terminal, that is, the internal structure of the level conversion device based on the control system is: the signal generating circuit 1 is connected in series between the anode S3 and the cathode S4 of the second input terminal, wherein the cathode S4 is grounded; the signal detecting circuit 2 is connected in series between the positive voltage input S1 and the negative voltage input S2 of the first input terminal, and the output terminal of the signal detecting circuit 2 is a level output terminal S5, and the positive voltage input S1 and the negative voltage input S2 are connected to the V+_EX and V-_EX of the external sensor.

[0031] The detailed working process of this embodiment is that the level conversion module U1 works after the first input terminal is connected to the external sensor and the second input terminal is connected to the external voltage output P_OUT, and the level output terminal S5 outputs a high level signal. The control system provides an external voltage output P_OUT, and the high level signal is used as a control signal for the control system to control the external device. In the above structure, only the external voltage output P_OUT is needed to support the signal generating circuit 1 in the level conversion module U1 to work, and the signal detection circuit 2 at the first input terminal is connected to the external sensor to form a loop, and the signal detection circuit 2 can convert the signal generated by the signal generating circuit 1 into an electrical signal, and combined with the signal sent by the external sensor, the level output terminal S5 provided by the signal detection circuit 2 outputs a high level signal. The control system completes the control of the external device. In this process, there is no need to consider the voltage range of the external sensor connected to the signal detection circuit 2, and the control system can identify the signal state of the external sensor, which overcomes the problems of limited performance, narrow scope of application and difficult cost control of the control system.

[0032] It should be noted that the signal generating circuit 1 is used to generate signals such as light intensity change, temperature change, etc., and the signal detecting circuit 2 receives the light intensity change signal or the temperature change signal. Then, the embodiment of the utility model intercepts the high level output of the signal detecting circuit 2 and outputs it from the level output terminal S5. Among them, the signal detecting circuit 2 generates a high level output, which requires the signal generating circuit 1 to be in a working state on the one hand, and requires the external sensor to send a signal, such as a pulse signal on the other hand.

[0033] See also Figure 2 The embodiment of the utility model shows the detailed circuit structure of the level conversion device based on the control system in which the signal generating circuit 1 generates light intensity changes, the signal detecting circuit 2 receives the light intensity change signal and the signal sent by the external sensor to output a high level signal. Figure 2 As shown, the signal generating circuit 1 includes a light emitting diode D1. The signal detecting circuit 2 includes a photosensitive diode D2 and a trigger F; in the signal detecting circuit 2, the photosensitive diode D2 detects the luminous intensity of the light emitting diode D1, and the trigger F outputs a high level signal.

[0034] In a preferred implementation, the trigger F includes an operational amplifier T, a level trigger unit U2, a first transistor M1 and a second transistor M2; the power supply input end of the operational amplifier T and the power supply input end of the level trigger unit U2 are connected to the positive voltage input S1 and the negative voltage input S2; the output end of the photosensitive diode D2 and the input end of the photosensitive diode D2 are respectively connected to the forward input end of the operational amplifier T and the reverse input end of the operational amplifier T; the input end of the level trigger unit U2 is connected to the voltage output end of the operational amplifier T, and the output end of the level trigger unit U2 is respectively connected to the gate of the first transistor M1 and the gate of the second transistor M2; the drain of the first transistor M1 is connected to the positive voltage input S1, the source of the first transistor M1 is connected to the drain of the second transistor, and the source of the first transistor M1 and the drain of the second transistor are connected to form the output end of the signal detection circuit 2; the second transistor is connected to the negative voltage input S2.

[0035] Based on the detailed structure of the above-mentioned trigger F, the working principle of the signal detection circuit 2 is: the photosensitive diode D2 detects the luminous intensity of the light-emitting diode D1 in the signal generating circuit 1, generates an electrical signal, and is amplified by the operational amplifier T. The level trigger unit U2 triggers the first transistor M1 and the second transistor M2 on its output side to operate. When the external sensor also transmits a signal, the first transistor M1 and the second transistor M2 are turned on, and the output end of the signal detection circuit 2 outputs the required high-level signal.

[0036] It should be noted that Figure 1 and Figure 2 Some auxiliary circuit structures in the level conversion device based on the control system are also shown, such as a bypass capacitor 4 and a first resistor 3 are also included between the positive voltage input S1 and the negative voltage input S2, and the second input terminal is also connected in series with a second resistor 5. Thereby achieving the purpose of improving the signal-to-noise ratio, providing a low impedance path, and preventing noise caused by excessive input values. Among them, one end of the bypass capacitor 4 is connected to the positive voltage input S1, and the other end of the bypass capacitor 4 is connected to the negative voltage input S2; a first resistor 3 is connected between one end of the bypass capacitor 4 and the positive voltage input S1. For another example, in addition to the positive voltage input S1, the negative voltage input S2, the anode S3, the cathode S4 and the level output terminal S5, a normally closed contact terminal S6 is also provided for protecting circuits and equipment.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A level conversion device based on a control system, characterized in that: It includes a level conversion module, a first input terminal, a second input terminal, and a level output terminal; The first input terminal is connected to an external sensor, and the second input terminal is connected to an external voltage output; the level output terminal outputs a high level signal; wherein the control system provides the external voltage output, and the high level signal is used by the control system to control an external device; The first input terminal includes a positive voltage input and a negative voltage input; the second input terminal includes an anode and a cathode; The level conversion module includes a signal generating circuit and a signal detecting circuit; The signal generating circuit is connected in series between the anode and the cathode of the second input terminal; The signal detection circuit is connected in series between the positive voltage input and the negative voltage input of the first input terminal, and the output terminal of the signal detection circuit is the level output terminal.

2. The level conversion device based on the control system as claimed in claim 1, characterized in that: The signal generating circuit includes a light emitting diode.

3. The level conversion device based on the control system as claimed in claim 2, characterized in that: The signal detection circuit includes a photodiode and a trigger; The photosensitive diode detects the light intensity of the light emitting diode, and the trigger outputs a high level signal.

4. The level conversion device based on the control system as claimed in claim 3, characterized in that: The trigger comprises an operational amplifier, a level trigger unit, a first triode and a second triode; The power supply input terminal of the operational amplifier and the power supply input terminal of the level trigger unit are connected to the positive voltage input and the negative voltage input; The output end of the photosensitive diode and the input end of the photosensitive diode are connected to the forward input end of the operational amplifier and the reverse input end of the operational amplifier respectively; The input end of the level trigger unit is connected to the voltage output end of the operational amplifier, and the output end of the level trigger unit is connected to the gate of the first transistor and the gate of the second transistor respectively; The drain of the first transistor is connected to the positive voltage input, the source of the first transistor is connected to the drain of the second transistor, and the source of the first transistor and the drain of the second transistor are connected to form the output end of the signal detection circuit; The second transistor is connected to the negative voltage input.

5. The level conversion device based on the control system as claimed in claim 1, characterized in that: A bypass capacitor and a first resistor are also included between the positive voltage input and the negative voltage input; One end of the bypass capacitor is connected to the positive voltage input, and the other end of the bypass capacitor is connected to the negative voltage input; the first resistor is connected between one end of the bypass capacitor and the positive voltage input.

6. The level conversion device based on a control system according to any one of claims 1 to 5, characterized in that: A normally closed contact terminal is also included.

7. The level conversion device based on a control system according to any one of claims 1 to 5, characterized in that: The second input terminal is further connected in series with a second resistor.

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