Input signal level conversion circuit

Abstract

The utility model provides an input signal level conversion circuit, which comprises an input signal preprocessing circuit and a phase inverter circuit, the input signal preprocessing circuit is in circuit connection with the phase inverter circuit, the input signal preprocessing circuit comprises a diode D1, the phase inverter circuit comprises a diode D2, the diode D1 is connected with the diode D2, and the diode D2 is connected with the diode D1. The positive electrode of the diode D1 and the positive electrode of the diode D2 are connected to form complementation. According to the utility model, the anti-interference capability can be enhanced, and misrecognition can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of level conversion circuit, specifically relates to an input signal level conversion. BACKGROUND

[0002] In the design process of electrical circuit of robot, intelligent cabinet, the use of IO is very extensive, for example, 12V, 24V switching quantity signal.But the IO of detection MCU usually only has 5V, 3.3V etc.;Therefore, in order to better detect the change of signal, level conversion circuit is needed.

[0003] The existing level conversion circuit mainly has diode level conversion circuit, transistor level conversion circuit, MOS tube level conversion circuit, integrated conversion chip etc., but the interference resistance of the existing conversion circuit is weak, and in some occasions, interference introduced by wiring can cause misidentification. UTILITY MODEL CONTENTS

[0004] In view of the deficiency of prior art, the utility model provides an input signal level conversion, which can enhance the interference resistance and reduce the misidentification.

[0005] The technical scheme of the utility model is realized as follows:

[0006] The utility model provides an input signal level conversion circuit, including input signal preprocessing circuit and inverter circuit, input signal preprocessing circuit with inverter circuit circuit connection, input signal preprocessing circuit contains diode D1, and inverter circuit contains diode D2, and the anode of diode D1 is connected with the anode of diode D2 and forms complementation.

[0007] Preferably, the inverter circuit comprises a diode D2, a resistor R3, a transistor Q3 and a resistor R2, the anode of the diode D2 is connected to the input signal preprocessing circuit, the cathode of the diode D2 is connected to the gate G of the transistor Q3, and one end of the resistor R3 is also connected to the cathode of the diode D2; the other end of the resistor R3 and the source S of the transistor Q3 are grounded, the drain D of the transistor Q3 is connected to one end of the resistor R2, and the other end of the resistor R2 is connected to a direct current power supply; at the same time, the drain D of the transistor Q3 is connected to a signal output terminal.

[0008] Preferably, the input signal preprocessing circuit comprises a diode D1, a resistor R1 and a capacitor C1, the cathode of the diode D1 is connected to a signal input terminal; one end of the resistor R1 is connected to a direct current power supply, and the other end of the resistor R1, the anode of the diode D1 and one end of the capacitor C1 are all connected to the input end of the inverter circuit.

[0009] Preferably, the diode is a Schottky diode.

[0010] Preferably, the transistor can be a BJT triode or a MOSFET transistor

[0011] Compared with the prior art, the utility model has the advantages that: the utility model discloses input signal level conversion circuit includes input signal pre -processing circuit and inverter circuit, wherein input signal pre -processing circuit contains diode D1, and inverter circuit contains diode D2, and the positive pole of diode D1 is connected with the positive pole of diode D2 and forms complementary action, thereby can avoid the common mode interference of input and further lead to the misidentification of signal. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0013] Figure 1 The structural block diagram of the input signal level conversion circuit of the utility model is shown in the figure.

[0014] Figure 2 The circuit diagram of the input signal level conversion circuit of the utility model is shown in the figure. DETAILED DESCRIPTION

[0015] The technical scheme in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0016] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0017] Referring to Figure 1 and Figure 2The utility model discloses an input signal level conversion circuit, including input signal preprocessing circuit and inverter circuit, input signal preprocessing circuit with inverter circuit circuit connection, input signal preprocessing circuit contains diode D1, and inverter circuit contains diode D2, and the anode of diode D1 is connected with the anode of diode D2 and forms complementation.

[0018] In the embodiment, the input signal preprocessing circuit contains diode D1, and the inverter circuit contains diode D2, and the anode of diode D1 is connected with the anode of diode D2 to form a complementary effect, thereby avoiding common-mode interference of the input end and further causing signal misidentification.

[0019] Specifically, as shown in Figure 2 The inverter circuit includes diode D2, resistor R3, transistor Q3 and resistor R2, the anode of diode D2 is connected with the input signal preprocessing circuit, the cathode of diode D2 is connected with the gate G of transistor Q3, and one end of resistor R3 is also connected with the cathode of diode D2; the other end of resistor R3 and the source S of transistor Q3 are grounded, the drain D of transistor Q3 is connected with one end of resistor R2, and the other end of resistor R2 is connected with a direct current power supply; at the same time, the drain D of transistor Q3 is connected with the signal output terminal TTL_O1.

[0020] As shown in Figure 2 The input signal preprocessing circuit specifically includes diode D1, resistor R1 and capacitor C1, the cathode of diode D1 is connected with the signal input terminal EXI_1; one end of resistor R1 is connected with a direct current power supply, and the other end of resistor R1, the anode of diode D1 and one end of capacitor C1 are all connected with the input end of the inverter circuit.

[0021] In the embodiment, the signal input terminal EXI_1 end of the input device input to the input signal preprocessing circuit is connected with capacitor C1 in the input signal preprocessing circuit to form a filter circuit, which can eliminate high-frequency signal conduction interference introduced by the whole machine wiring of the robot; at the same time, diode D1 and diode D2 form a complementary effect, thereby avoiding common-mode interference of the input end and further causing signal misidentification.

[0022] In the embodiment, when the EXI_1 end is in a state of suspension, high resistance, high level and the like, under the action of the direct current power supply VCC and the input signal preprocessing circuit and the inverter circuit, resistor R1, diode D2 and resistor R3 and the like make Q1 conductive, and TTL_O1 outputs a low level.

[0023] When the EXI_1 end is pulled to GND, the 2 pin (i.e. the positive end) of the diode D2 has the voltage drop of D1, and since the voltage drop of D1 is offset by the voltage drop of D2, the voltage at the R3 is 0, and Q1 is cut off, and the TTL_O1 output is high.

[0024] In a specific application, the input signal level conversion circuit of the utility model can be arranged on the circuit board PCBA, and then connected with the external switch node signal and NPN wet node through the reserved terminals (signal input terminal EXI_1 and signal output terminal TTL_O1) and wires.

[0025] When the circuit outside is the switch signal of the dry node, one end of the switch signal is connected to the signal input terminal EXI_1, and the other end is grounded. When the switch is open, the signal input terminal EXI_1 is in a high resistance state, and is converted to a low level by the input signal level conversion circuit of the utility model. When the switch is closed, the input terminal is pulled low, and is converted to a high level by the input signal level conversion circuit of the utility model.

[0026] When the circuit outside is the NPN wet node signal, the NPN output voltage of the sensor can be 5V, 12V, 24V, 48V, etc. The output end of the NPN is connected to the signal input terminal EXI_1, and the GND of the NPN is grounded with the input circuit.

[0027] When there is no action, the NPN output is in a high resistance state, or is pulled up to 5V, 12V, 24V, 48V, etc. by the internal resistance, and is converted to a low level by the input signal level conversion circuit of the utility model due to the one-way conduction of the diode D1.

[0028] When there is action, the NPN output end is equivalent to being connected to GND, and the output end of part of the NPN has a voltage of about 0.3V, which is converted to a high level by the input signal level conversion circuit of the utility model.

[0029] In the specific circuit of the robot and the intelligent cabinet, since the wires are distributed in the robot, the loop composed of the resistance, distributed inductance and distributed capacitance of the wire can easily introduce high-frequency interference and changes in the common-mode voltage, which can be absorbed and filtered by the input signal level conversion circuit of the utility model. At the same time, due to the complementary action of the diode D1 and the diode D2, the common-mode interference of the input end can be avoided, and the misrecognition of the signal can be avoided.

[0030] Further, the diode can be a Schottky diode, which has lower power consumption and better voltage stabilization.

[0031] The transistor can be a BJT triode or a MOSFET transistor.

[0032] In summary, the utility model input signal level conversion circuit includes input signal preprocessing circuit and inverter circuit, wherein input signal preprocessing circuit contains diode D1, and inverter circuit contains diode D2, and the positive pole of diode D1 is connected with the positive pole of diode D2 and forms complementary action, thereby can avoid common mode interference of input end and further cause the misidentification of signal.

[0033] The above merely describes the preferred embodiments of the utility model and is not intended to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An input signal level conversion circuit, characterized by comprising: The input signal pre-processing circuit and the inverter circuit are connected electrically, the input signal pre-processing circuit contains diode D1, and the inverter circuit contains diode D2, the anode of diode D1 is connected with the anode of diode D2 to form complementation.

2. The input signal level conversion circuit according to claim 1, wherein The inverter circuit contains diode D2, resistor R3, transistor Q3 and resistor R2, the anode of diode D2 is connected with the input signal pre-processing circuit, the cathode of diode D2 is connected with the gate G of transistor Q3, one end of resistor R3 is also connected with the cathode of diode D2; the other end of resistor R3 and the source S of transistor Q3 are grounded, the drain D of transistor Q3 is connected with one end of resistor R2, and the other end of resistor R2 is connected with the direct current power supply; at the same time, the drain D of transistor Q3 is connected with the signal output terminal.

3. The input signal level conversion circuit according to claim 1, wherein The input signal pre-processing circuit contains diode D1, resistor R1 and capacitor C1, the cathode of diode D1 is connected with the signal input terminal; one end of resistor R1 is connected with the direct current power supply, the other end of resistor R1, the anode of diode D1 and one end of capacitor C1 are all connected with the input terminal of the inverter circuit.

4. The input signal level conversion circuit according to claim 2 or 3, characterized by, The diode is a Schottky diode.

5. The input signal level shifting circuit of claim 2, wherein, The transistor can be a BJT transistor or a MOSFET transistor.

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