Hardware circuit for converting-10V-10V into 0-10V and powered by external power supply

Abstract

The utility model discloses a hardware circuit for converting-10V to 10V to 0-10V supplied by an external power supply, which comprises a first voltage conversion circuit, a second voltage conversion circuit, a power supply indicating circuit, a module power supply circuit and a calibration circuit, and is characterized in that the first voltage conversion circuit comprises a first anti-phase adder U2 and a first single phase inverter U3, and the second voltage conversion circuit comprises a second anti-phase adder U2 and a second single phase inverter U4; the first voltage conversion circuit comprises a first anti-phase adder U5 and a first single-phase inverter U6, the second voltage conversion circuit comprises a second anti-phase adder U5 and a second single-phase inverter U6, the power supply indicating circuit is electrically connected with the first voltage conversion circuit and the second voltage conversion circuit, the module power supply circuit is electrically connected with the first voltage conversion circuit and the second voltage conversion circuit, and the calibration circuit is electrically connected with the second voltage conversion circuit. Therefore, a differential input mode is adopted, jig interference and zero drift are effectively restrained, the zero position of the output voltage is detected regularly, and the output voltage returns to the preset zero position again by adjusting the zero drift value.

Description

Technical Field

[0001] The utility model relates to the technical field of rail transit bidirectional converters, and particularly relates to a hardware circuit for converting - 10V to 10V powered by an external power supply into 0V to 10V. Background Art

[0002] In the fields of industrial automation, instrumentation, data acquisition, etc., it is often necessary to convert signals with different voltage ranges to meet the requirements of different devices or systems. Among them, the voltage conversion from - 10V to 10V to 0V to 10V is a common requirement. However, traditional voltage conversion circuits often have problems such as the influence of signal source internal resistance and zero drift, which affect the accuracy and stability of the conversion. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems in the related technologies to a certain extent.

[0004] To this end, the purpose of the utility model is to propose a hardware circuit for converting - 10V to 10V powered by an external power supply into 0V to 10V. The differential input mode is adopted, which effectively suppresses industrial mode interference and zero drift. The zero position of the output voltage is periodically detected and the zero drift value is adjusted to make the output voltage return to the preset zero position again.

[0005] To achieve the above object, the utility model proposes a hardware circuit for converting - 10V to 10V powered by an external power supply into 0V to 10V, including a first voltage conversion circuit, a second voltage conversion circuit, a power indication circuit, a module power supply circuit and a calibration circuit. Among them, the first voltage conversion circuit includes a first inverting adder U2 and a first single - stage inverting amplifier U3. The first inverting adder U2 is electrically connected to the - 10V to + 10V input circuit; the first single - stage inverting amplifier U3 is electrically connected to the first inverting adder U2; the second voltage conversion circuit includes a second inverting adder U5 and a second single - stage inverting amplifier U6. The second inverting adder U5 is electrically connected to the - 10V to + 10V power supply; the second single - stage inverting amplifier U6 is electrically connected to the first inverting adder U5; the power indication circuit is electrically connected to the first voltage conversion circuit and the second voltage conversion circuit respectively; the module power supply circuit is electrically connected to the first voltage conversion circuit and the second voltage conversion circuit respectively; the calibration circuit is electrically connected to the second voltage conversion circuit and is also electrically connected to the output circuit.

[0006] The hardware circuit for converting -10V to 10V powered by an external power supply of the present utility model adopts a differential input mode, effectively suppressing industrial mode interference and zero drift, regularly detecting the zero position of the output voltage and adjusting the zero drift value to make the output voltage return to the preset zero position again.

[0007] In addition, the hardware circuit for converting -10V to 10V powered by an external power supply as proposed above in the application may further have the following additional technical features:

[0008] Specifically, the calibration circuit includes an adjustable resistor R23 and a voltage reference source. Among them, the adjustable resistor R23 is electrically connected to the output circuit; the voltage reference source is electrically connected to the output circuit.

[0009] Specifically, the power supply indication circuit includes a power supply indicator light. The power supply indicator light is an LED light, and the power supply indicator light is electrically connected to the first voltage conversion circuit and the second voltage conversion circuit respectively.

[0010] Specifically, the module power supply circuit includes a power supply chip, and the power supply chip is electrically connected to an external power supply at the input.

[0011] Specifically, the external power supply is 24V, and the power output of the power supply chip is -15V to 15V.

[0012] The additional aspects and advantages of the present utility model will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The above-mentioned and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the following description of the embodiments in conjunction with the drawings, where:

[0014] Figure 1 is the schematic diagram of the hardware circuit of the present utility model;

[0015] Figure 2 is the schematic diagram of the first voltage conversion circuit of the present utility model;

[0016] Figure 3 is the schematic diagram of the second voltage conversion circuit of the present utility model;

[0017] Figure 4 is the schematic diagram of the power supply indication circuit of the present utility model;

[0018] Figure 5 is the schematic diagram of the module power supply circuit of the present utility model;

[0019] Figure 6 is the schematic diagram of the calibration circuit of the present utility model;

[0020] Figure 7 This is the principle block diagram of the calibration circuit of the present utility model. Specific embodiments

[0021] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present utility model, and should not be construed as limiting the present utility model. On the contrary, the embodiments of the present utility model include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0022] The following describes the hardware circuit for converting -10V to 10V supplied by an external power supply to 0V to 10V in the embodiments of the present utility model in conjunction with the drawings.

[0023] As Figures 1-7 shown, the hardware circuit for converting -10V to 10V supplied by an external power supply to 0V to 10V in the embodiments of the present utility model includes a first voltage conversion circuit, a second voltage conversion circuit, a power indication circuit, a module power supply circuit, and a calibration circuit.

[0024] Among them, the first voltage conversion circuit includes a first inverting adder U2 and a first single-inverter U3.

[0025] Among them, the first inverting adder U2 is electrically connected to the -10 to +10V input circuit, and the first single-inverter U3 is electrically connected to the first inverting adder U2.

[0026] It should be noted that the first single-inverter U3 in the first voltage conversion circuit adds -10 to +10V and +10V voltages and amplifies them by a factor of 1 / 2, outputs a -10V to 0V signal, and then sends it to the first single-inverter U3 to be inverted into a 0 to +10V signal, thereby realizing the voltage conversion.

[0027] The second voltage conversion circuit includes a second inverting adder U5 and a second single-inverter U6.

[0028] Among them, the second inverting adder U5 is electrically connected to the -10 to +10V power supply, and the second single-inverter U6 is electrically connected to the first inverting adder U5.

[0029] It should be noted that the second inverting adder U5 in the second voltage conversion circuit adds -10 to +10V and +10V voltages and amplifies them by a factor of 1 / 2, outputs a -10V to 0V signal, and then sends it to the second single-inverter U6 to be inverted into a 0 to +10V signal, thereby realizing the voltage conversion.

[0030] The power indicator circuit is electrically connected to the first voltage conversion circuit and the second voltage conversion circuit respectively. The module power supply circuit is electrically connected to the first voltage conversion circuit and the second voltage conversion circuit respectively. The calibration circuit is electrically connected to the second voltage conversion circuit and is also electrically connected to the output circuit.

[0031] It should be noted that: the power indicator circuit designs a voltage indicator light for each conversion circuit, and the lighting of the indicator light indicates that the circuit is working properly. The module power supply circuit converts the external 24V voltage into -15V to 15V to drive the first voltage conversion circuit and the second voltage conversion circuit. The calibration circuit adjusts the zero drift value by adjusting the resistance value of the resistor.

[0032] In an embodiment of the present invention, as Figure 6 shown, the calibration circuit includes a variable resistor R23 and a voltage reference source.

[0033] Among them, the variable resistor R23 is electrically connected to the output circuit, and the voltage reference source is electrically connected to the output circuit.

[0034] It should be noted that the output circuit of the calibration circuit adopts a low output impedance design to ensure that the output voltage signal can be stably transmitted to the subsequent device, and the zero drift value is adjusted by the variable resistor R23.

[0035] In an embodiment of the present invention, as Figure 4 shown, the power indicator circuit includes a power indicator light, and the power indicator light is an LED light. The power indicator light is electrically connected to the first voltage conversion circuit and the second voltage conversion circuit respectively.

[0036] It should be noted that the power indicator lights on the power indicator circuit are respectively installed on the first voltage conversion circuit and the second voltage conversion circuit, and it is judged whether the circuit is operating normally by whether the power indicator lights are on.

[0037] In an embodiment of the present invention, as Figure 5 shown, the module power supply circuit includes a power chip, and the power chip is electrically connected to the external power supply at the input.

[0038] It should be noted that the power chip is electrically connected to the external power supply and is powered by the external power supply. The power chip converts the 24V of the external power supply and outputs a power of -15V to 15V.

[0039] In an embodiment of the present invention, as Figure 7As shown in the figure, the steps for the circuit to start or require recalibration are as follows: First, disconnect the input signal. The first single-inverting amplifier U3 in the first voltage conversion circuit adds the voltages of -10V to +10V and +10V, amplifies the sum by 1 / 2, and outputs a signal of -10V to 0V. This signal is then sent to the first single-inverting amplifier U3 to be inverted into a signal of 0V to +10V, thus achieving voltage conversion. In addition, the second inverting adder U5 in the second voltage conversion circuit adds the voltages of -10V to +10V and +10V, amplifies the sum by 1 / 2, and outputs a signal of -10V to 0V. This signal is then sent to the second single-inverting amplifier U6 to be inverted into a signal of 0V to +10V, thus achieving voltage conversion. By adopting the differential input mode, common-mode interference and zero drift are effectively suppressed.

[0040] The calibration circuit adjusts the zero position of the output voltage by adjusting the resistor R23 to achieve calibration of zero drift. During the calibration process, first, the digital quantity in the initial state is read and compared with the ideal calculated value to obtain a difference. The difference is sent as a calibration value to the logic of the zero correction ticket. Subsequently, the input signal is reconnected and normal operation begins. During the operation of the circuit, the zero position of the output voltage is regularly detected to check if drift occurs. If drift occurs, after the device stops, the zero drift value is adjusted to make the output voltage return to the preset zero position.

[0041] In summary, the hardware circuit for converting -10V to 10V supplied by an external power supply to 0V to 10V in the embodiment of the present utility model adopts the differential input mode, effectively suppressing common-mode interference and zero drift. The zero position of the output voltage is regularly detected and the zero drift value is adjusted to make the output voltage return to the preset zero position.

[0042] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. A hardware circuit for converting -10V to 10V powered by an external power supply into 0V to 10V, characterized in that, It includes a first voltage conversion circuit, a second voltage conversion circuit, a power indicator circuit, a module power supply circuit, and a calibration circuit. Among them, The first voltage conversion circuit includes a first inverting adder U2 and a first single-inverting inverter U3. Among them, The first inverting adder U2 is electrically connected to a -10 to +10V input circuit; The first single-inverting inverter U3 is electrically connected to the first inverting adder U2; The second voltage conversion circuit includes a second inverting adder U5 and a second single-inverting inverter U6. Among them, The second inverting adder U5 is electrically connected to a -10 to +10V power supply; The second single-inverting inverter U6 is electrically connected to the first inverting adder U5; The power indicator circuit is electrically connected to the first voltage conversion circuit and the second voltage conversion circuit respectively; The module power supply circuit is electrically connected to the first voltage conversion circuit and the second voltage conversion circuit respectively; The calibration circuit is electrically connected to the second voltage conversion circuit, and the calibration circuit is electrically connected to the output circuit.

2. The hardware circuit for converting -10V to 10V powered by an external power supply to 0V to 10V according to claim 1, characterized in that The calibration circuit includes a variable resistor R23 and a voltage reference source. Among them, The variable resistor R23 is electrically connected to the output circuit; The voltage reference source is electrically connected to the output circuit.

3. The hardware circuit for converting -10V to 10V powered by an external power supply into 0V to 10V according to claim 1, characterized in that, The power indicator circuit includes a power indicator light. The power indicator light is an LED light, and the power indicator light is electrically connected to the first voltage conversion circuit and the second voltage conversion circuit respectively.

4. The hardware circuit for converting -10V to 10V powered by an external power supply into 0V to 10V according to claim 1, characterized in that, The module power supply circuit includes a power supply chip, and the power supply chip is electrically connected to an external power supply at the input.

5. The hardware circuit for converting -10V to 10V powered by an external power supply to 0V to 10V according to claim 4, characterized in that, The external power supply is 24V, and the power output of the power supply chip is -15V to 15V.

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