Circuit compatible with positive logic control and negative logic control

Abstract

The utility model relates to the technical field of circuit design, in particular to a circuit compatible with positive logic and negative logic control, which comprises an operational amplifier, a target diode, a power input end and an ON / OFF end, the target diode is arranged between the first pin of the operational amplifier and the ON / OFF end, or the target diode is arranged between the third pin of the operational amplifier and the ON / OFF end; when the target diode is arranged between the first pin position and the ON / OFF end of the operational amplifier, the conduction end of the target diode is also connected with the power supply input end; and when the target diode is arranged between the third pin of the operational amplifier and the ON / OFF end, the ON / OFF end is also connected with the power supply input end. The positive logic control mode and the negative logic control mode can be compatible on the same PCB, redesign and remanufacturing are not needed, design flexibility is improved, meanwhile, repeated PCB design and production are avoided, and therefore manufacturing cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit design technical field especially relates to a circuit of compatible positive logic and negative logic control. BACKGROUND

[0002] The prior art DC / DC converter power module has significant limitations in logic control, and a single positive logic or negative logic control mode is usually supported on a PCB board. This design not only lacks flexibility, but also requires re-design and manufacturing of the PCB when switching control logic, resulting in longer design cycle and increased complexity. At the same time, different designs require different materials and components, which brings additional challenges to material management and increases the difficulty of inventory management and production control. In addition, repeated PCB design and production process reduces overall production efficiency, cannot quickly adapt to changes in market demand, and further leads to rising manufacturing costs and declining product competitiveness. Therefore, the existing DC / DC converter power module has deficiencies in design flexibility, material management, production efficiency and cost control.

[0003] Therefore, there is an urgent need to provide a technical solution to solve the above problems. UTILITY MODEL CONTENT

[0004] To solve the above technical problems, the utility model provides a circuit compatible with positive logic and negative logic control.

[0005] A circuit compatible with positive logic and negative logic control, comprising: an operational amplifier, a target diode, a power input end and an ON / OFF end.

[0006] The target diode is arranged between the first pin of the operational amplifier and the ON / OFF end, or the target diode is arranged between the third pin of the operational amplifier and the ON / OFF end.

[0007] When the target diode is arranged between the first pin of the operational amplifier and the ON / OFF end, the conduction end of the target diode is also connected to the power input end.

[0008] When the target diode is arranged between the third pin of the operational amplifier and the ON / OFF end, the ON / OFF end is also connected to the power input end.

[0009] The beneficial effects of the battery auxiliary charging circuit of the utility model are as follows:

[0010] The utility model discloses can be compatible positive logic and negative logic control mode on the same piece of PCB board, need not redesign and manufacture, promote the design flexibility while avoided repeated PCB design and production, thereby reduced manufacturing cost.

[0011] In an alternative way, further comprising: a first resistor;

[0012] When the target diode is arranged between the first pin of the operational amplifier and the ON / OFF end, the first resistor is connected with the power input end, the conducting end of the target diode and the first pin of the operational amplifier respectively;

[0013] When the target diode is arranged between the third pin of the operational amplifier and the ON / OFF end, the first resistor is connected with the power input end, the ON / OFF end and the first pin of the operational amplifier respectively.

[0014] In the above alternative way, by introducing the first resistor, the voltage distribution relationship between the power input end, the ON / OFF end and the input end of the operational amplifier can be accurately adjusted according to the position of the target diode. Thus, no matter where the target diode is located, the input end voltage of the operational amplifier can be reasonably distributed according to the logic control requirement, so as to realize accurate positive and negative logic control selection.

[0015] In an alternative way, further comprising: a second resistor;

[0016] When the target diode is arranged between the first pin of the operational amplifier and the ON / OFF end, the second resistor is connected with the first resistor, the conducting end of the target diode and the first pin of the operational amplifier respectively;

[0017] When the target diode is arranged between the third pin of the operational amplifier and the ON / OFF end, the second resistor is connected with the first resistor, the ON / OFF end and the first pin of the operational amplifier respectively.

[0018] In the above alternative way, the introduction of the second resistor further optimizes the voltage distribution network. Through cooperation with the first resistor and the target diode, the second resistor can help stabilize the voltage at the input end of the operational amplifier, ensure stable working characteristics of the circuit under different logic control modes, and at the same time help reduce the influence of voltage fluctuation on logic control and improve circuit stability.

[0019] In an alternative way, further comprising: a third resistor;

[0020] When the target diode is arranged between the first terminal of the operational amplifier and the ON / OFF terminal, the third resistor is connected to the power input terminal, the first resistor, the ON / OFF terminal and the third terminal of the operational amplifier, respectively.

[0021] When the target diode is arranged between the third terminal of the operational amplifier and the ON / OFF terminal, the third resistor is connected to the power input terminal, the first resistor, the conducting terminal of the target diode and the third terminal of the operational amplifier, respectively.

[0022] In the optional manner described above, the connection of the third resistor forms a complex voltage feedback network between the power input terminal, the first resistor, the ON / OFF terminal and different input terminals of the operational amplifier. Thus, the voltages at the non-inverting input terminal and the inverting input terminal of the operational amplifier can be adjusted according to actual requirements in different logic control modes, so as to realize accurate logic control switching and help improve the flexibility and adaptability of the circuit.

[0023] In an optional manner, the circuit further comprises a fourth resistor.

[0024] When the target diode is arranged between the first terminal of the operational amplifier and the ON / OFF terminal, the fourth resistor is connected to the third resistor, the ON / OFF terminal, the third terminal of the operational amplifier and the second resistor, respectively.

[0025] In an optional manner, when the target diode is arranged between the third terminal of the operational amplifier and the ON / OFF terminal, the fourth resistor is connected to the third resistor, the conducting terminal of the target diode, the third terminal of the operational amplifier and the second resistor, respectively.

[0026] In the optional manner described above, the introduction of the fourth resistor connects the third resistor, the conducting terminal of the target diode, the third terminal of the operational amplifier and the second resistor, further optimizing the stability of the voltage feedback network. Whether the target diode is connected to the first terminal or the third terminal of the operational amplifier, the fourth resistor can help balance the voltages at the nodes, ensure stable working characteristics of the circuit in different logic control modes, and help reduce the possibility of voltage mismatch and improve the reliability of the circuit.

[0027] In an optional manner, the circuit further comprises a fifth resistor.

[0028] When the target diode is arranged between the first terminal of the operational amplifier and the ON / OFF terminal, the fifth resistor is connected to the first resistor, the conducting terminal of the target diode, the second resistor and the first terminal of the operational amplifier, respectively.

[0029] In an alternative mode, when the target diode is arranged between the third terminal of the operational amplifier and the ON / OFF terminal, the fifth resistor is connected with the first resistor, the ON / OFF terminal, the second resistor and the first terminal of the operational amplifier respectively.

[0030] In the above alternative mode, the connection of the fifth resistor forms a fine voltage regulation network between the target diode, the ON / OFF terminal, the first resistor, the second resistor and the first terminal of the operational amplifier, which can ensure that the input voltage of the operational amplifier can be finely regulated in different logic control modes, and help to improve the accuracy and response speed of the circuit, and optimize the overall performance of the circuit.

[0031] In an alternative mode, further comprising a sixth resistor;

[0032] The sixth resistor is connected with the fifth resistor, the first terminal of the operational amplifier and the fourth terminal of the operational amplifier respectively.

[0033] In the above alternative mode, the sixth resistor is connected with the fifth resistor, the first terminal of the operational amplifier and the fourth terminal of the operational amplifier, which further enhances the voltage feedback and regulation capability of the circuit, helps to ensure the stability of the operating point of the operational amplifier, and reduces the voltage drift of the circuit in different logic control modes, thereby improving the stability and reliability of the circuit.

[0034] In an alternative mode, further comprising an OFF terminal;

[0035] The OFF terminal is connected with the sixth resistor and the fourth terminal of the operational amplifier respectively.

[0036] In the above alternative mode, the OFF terminal is connected with the sixth resistor and the fourth terminal of the operational amplifier, which provides an external control port. Through the external control port, the working state of the operational amplifier can be directly controlled, further enhancing the controllability and flexibility of the circuit. In practical applications, it helps to realize the quick shutdown or restart of the circuit, and improves the practicability and convenience of the circuit.

[0037] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented in accordance with the content of the specification, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0038] The accompanying drawings are only used to show the embodiments and are not considered as limiting the utility model. Moreover, the same components are denoted by the same reference numerals throughout the drawings. In the drawings:

[0039] Figure 1 A schematic diagram of a circuit compatible with positive logic control of the utility model;

[0040] Figure 2 A schematic diagram of a circuit compatible with negative logic control of the utility model;

[0041] Figure 3 A schematic diagram of a circuit compatible with positive logic control of the utility model;

[0042] Reference numerals: 1, first pin; 2, second pin; 3, third pin; 4, fourth pin; 5, fifth pin; 6, ON / OFF end; 7, power input end; 8, OFF end; U1, operational amplifier; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; R6, sixth resistor; D1, target diode. DETAILED DESCRIPTION

[0043] Exemplary embodiments of the utility model will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the utility model are shown in the drawings, it should be understood that the utility model can be implemented in various forms and should not be limited by the embodiments described herein.

[0044] Figure 1 A schematic diagram of a circuit compatible with negative logic control of the utility model. As shown in Figure 1 , it comprises: an operational amplifier, a target diode, a power input end and an ON / OFF end;

[0045] The target diode is arranged between the first pin of the operational amplifier and the ON / OFF end, or the target diode is arranged between the third pin of the operational amplifier and the ON / OFF end;

[0046] When the target diode is arranged between the first pin of the operational amplifier and the ON / OFF end, the conduction end of the target diode is also connected to the power input end;

[0047] When the target diode is arranged between the third pin of the operational amplifier and the ON / OFF end, the ON / OFF end is also connected to the power input end.

[0048] The operational amplifier is mainly used for comparing input voltages and outputting a control signal in the circuit to control the opening or closing operation of the post-PWM controller.

[0049] The target diode is used for controlling the input signal path selection of the operational amplifier to realize compatible control of positive logic and negative logic. The target diode receives a control signal from the ON / OFF end. The control signal obtained after processing is used for controlling the working mode of the operational amplifier.

[0050] The power input end provides power input in the circuit to supply the input end of the operational amplifier after voltage division. The power input end receives a voltage from a total power supply and divides the voltage through a plurality of resistors to provide a suitable voltage level to the first terminal and the third terminal of the operational amplifier, so that the input end of the operational amplifier obtains a correct voltage signal to accurately compare voltages and output a control signal.

[0051] The ON / OFF end is used for receiving an external control signal to determine the working state of the circuit. Further, the ON / OFF end receives a control signal from a control source and transmits the control signal to a specific input end (the first terminal or the third terminal) of the operational amplifier through the target diode. The control signal is guided to the corresponding input end of the operational amplifier according to the connection mode of the diode in the ON / OFF end to control the state of the circuit. The control signal obtained after processing is transmitted to the operational amplifier to control the switching state and working mode of the circuit.

[0052] The circuit capable of compatible positive logic and negative logic control of the utility model can be compatible with positive logic and negative logic control mode on the same PCB board, without the need of redesign and manufacturing, improving the design flexibility while avoiding repeated PCB design and production, thereby reducing the manufacturing cost.

[0053] In an optional mode, the circuit further comprises a first resistor.

[0054] When the target diode is disposed between the first pin of the operational amplifier and the ON / OFF terminal, the first resistor is connected to the power input terminal, the conducting terminal of the target diode and the first pin of the operational amplifier, respectively.

[0055] When the target diode is disposed between the third pin of the operational amplifier and the ON / OFF terminal, the first resistor is connected to the power input terminal, the ON / OFF terminal and the first pin of the operational amplifier, respectively.

[0056] The first resistor is used to adjust and stabilize the voltage between the power input terminal and the input terminal of the operational amplifier. The first resistor receives the voltage from the power input terminal according to the position of the target diode. When the target diode is disposed between the first pin of the operational amplifier and the ON / OFF terminal, the first resistor is connected to the power input terminal, the conducting terminal of the target diode and the first pin of the operational amplifier, respectively, and at this time, the first resistor performs current limiting and voltage dividing on the voltage input from the power input terminal. When the target diode is disposed between the third pin of the operational amplifier and the ON / OFF terminal, the first resistor is connected to the power input terminal, the ON / OFF terminal and the first pin of the operational amplifier, respectively, and continues to perform the functions of current limiting and voltage dividing. The first resistor processes the voltage through the above connections to ensure that the first pin of the operational amplifier obtains a stable and appropriate input signal. The processed stable voltage is output to the first pin of the operational amplifier to ensure the normal operation of the operational amplifier in different working modes.

[0057] In an optional manner, the method further comprises: connecting the second resistor to the first resistor, the conducting terminal of the target diode and the first pin of the operational amplifier, respectively, when the target diode is disposed between the first pin of the operational amplifier and the ON / OFF terminal.

[0058] When the target diode is disposed between the first pin of the operational amplifier and the ON / OFF terminal, the second resistor is connected to the first resistor, the conducting terminal of the target diode and the first pin of the operational amplifier, respectively.

[0059] When the target diode is disposed between the third pin of the operational amplifier and the ON / OFF terminal, the second resistor is connected to the first resistor, the ON / OFF terminal and the first pin of the operational amplifier, respectively.

[0060] The second resistor is used to cooperate with the first resistor to further adjust and stabilize the voltage received by the first pin of the operational amplifier. The second resistor receives the voltage from the first resistor and the conducting end of the target diode according to the position of the target diode. When the target diode is arranged between the first pin of the operational amplifier and the ON / OFF end, the second resistor is connected to the first resistor, the conducting end of the target diode and the first pin of the operational amplifier, respectively, and at this time, the second resistor further limits the current and divides the voltage transmitted from the first resistor and the target diode. When the target diode is arranged between the third pin of the operational amplifier and the ON / OFF end, the second resistor is connected to the first resistor, the ON / OFF end and the first pin of the operational amplifier, respectively, and continues to limit the current and divide the voltage transmitted from the first resistor and the ON / OFF end. The second resistor can ensure that the first pin of the operational amplifier obtains a more accurate and stable voltage. The processed stable voltage is output to the first pin of the operational amplifier to ensure that the operational amplifier obtains accurate input voltage in different working modes.

[0061] In an optional mode, further comprising a third resistor;

[0062] When the target diode is arranged between the first pin of the operational amplifier and the ON / OFF end, the third resistor is connected to the power input end, the first resistor, the ON / OFF end and the third pin of the operational amplifier, respectively;

[0063] When the target diode is arranged between the third pin of the operational amplifier and the ON / OFF end, the third resistor is connected to the power input end, the first resistor, the conducting end of the target diode and the third pin of the operational amplifier, respectively.

[0064] The third resistor is used to adjust and stabilize the voltage of the third pin of the operational amplifier, and cooperate with the first resistor to ensure the accuracy of the voltage. The third resistor receives the voltage from the power input end and the first resistor according to the position of the target diode. When the target diode is arranged between the first pin of the operational amplifier and the ON / OFF end, the third resistor is connected to the power input end, the first resistor, the ON / OFF end and the third pin of the operational amplifier, respectively, and at this time, the third resistor limits the current and divides the voltage transmitted from the power input end and the first resistor. When the target diode is arranged between the third pin of the operational amplifier and the ON / OFF end, the third resistor is connected to the power input end, the first resistor and the conducting end of the target diode, respectively, and continues to limit the current and divide the voltage transmitted from the power input end and the first resistor. The third resistor can ensure that the third pin of the operational amplifier obtains a stable and accurate voltage. Finally, the processed voltage is output to the third pin of the operational amplifier to ensure that the operational amplifier can receive consistent input voltage in different working modes.

[0065] In an alternative, a fourth resistor is further included;

[0066] When the target diode is disposed between the first pin of the operational amplifier and the ON / OFF terminal, the fourth resistor is connected with the third resistor, the ON / OFF terminal, the third pin of the operational amplifier and the second resistor respectively.

[0067] When the target diode is disposed between the third pin of the operational amplifier and the ON / OFF terminal, the fourth resistor is connected with the third resistor, the conducting terminal of the target diode, the third pin of the operational amplifier and the second resistor respectively.

[0068] The fourth resistor is used to further adjust and stabilize the voltage of the third pin of the operational amplifier in the circuit, and assist the second resistor and the third resistor to achieve precise control of the voltage. The fourth resistor receives the voltage from the third resistor and the second resistor according to the position of the target diode. When the target diode is disposed between the first pin of the operational amplifier and the ON / OFF terminal, the fourth resistor is connected with the third resistor, the ON / OFF terminal, the third pin of the operational amplifier and the second resistor respectively, at this time the fourth resistor further limits the current and divides the voltage transmitted from the third resistor and the second resistor. When the target diode is disposed between the third pin of the operational amplifier and the ON / OFF terminal, the fourth resistor is connected with the third resistor, the conducting terminal of the target diode, the third pin of the operational amplifier and the second resistor respectively, and continues to limit the current and divide the voltage transmitted from the third resistor and the second resistor. The fourth resistor can ensure that the third pin of the operational amplifier obtains a more stable and accurate voltage. The processed voltage is output to the third pin of the operational amplifier to ensure that the operational amplifier can receive consistent and stable input voltage in different working modes.

[0069] In an alternative, a fifth resistor is further included;

[0070] When the target diode is disposed between the first pin of the operational amplifier and the ON / OFF terminal, the fifth resistor is connected with the first resistor, the conducting terminal of the target diode, the second resistor and the first pin of the operational amplifier respectively.

[0071] When the target diode is disposed between the third pin of the operational amplifier and the ON / OFF terminal, the fifth resistor is connected with the first resistor, the ON / OFF terminal, the second resistor and the first pin of the operational amplifier respectively.

[0072] The fifth resistor is used to adjust the voltage of the first pin of the operational amplifier, to ensure its stability, and to work with the first resistor and the second resistor to optimize the voltage distribution. According to the position of the target diode, the fifth resistor receives voltage from the first resistor and the second resistor. When the target diode is set between the first pin of the operational amplifier and the ON / OFF terminal, the fifth resistor is connected with the first resistor, the conducting terminal of the target diode, the second resistor and the first pin of the operational amplifier respectively, at this time, the fifth resistor carries out current limiting and voltage dividing on the voltage transmitted from the first resistor and the second resistor. When the target diode is set between the third pin of the operational amplifier and the ON / OFF terminal, the fifth resistor is connected with the first resistor, the ON / OFF terminal, the second resistor and the first pin of the operational amplifier respectively, and continues to carry out current limiting and voltage dividing on the voltage transmitted from the first resistor and the second resistor. The fifth resistor can ensure that the first pin of the operational amplifier obtains stable and accurate voltage. The processed voltage is output to the first pin of the operational amplifier, to ensure that the operational amplifier can receive consistent and stable input voltage in different working modes.

[0073] In an optional mode, further comprising: a sixth resistor;

[0074] The sixth resistor is connected with the fifth resistor, the first pin of the operational amplifier and the fourth pin of the operational amplifier respectively.

[0075] The sixth resistor is used to stabilize and transmit the voltage of the first pin of the operational amplifier to the fourth pin, to ensure that the voltage between the two pins is consistent. The sixth resistor receives voltage from the first pin of the operational amplifier through the fifth resistor. The sixth resistor is connected with the fifth resistor, the first pin of the operational amplifier and the fourth pin of the operational amplifier respectively, and carries out current limiting and voltage dividing on the voltage transmitted from the first pin. The sixth resistor can ensure that the fourth pin of the operational amplifier obtains stable voltage matching the first pin. The processed voltage is output to the fourth pin of the operational amplifier, to ensure that the relevant part of the operational amplifier receives consistent and stable voltage when working.

[0076] In an optional mode, further comprising: an OFF terminal;

[0077] The OFF terminal is connected with the sixth resistor and the fourth pin of the operational amplifier respectively.

[0078] The OFF terminal is used to provide a connection point for a shutdown or control signal in the circuit and is electrically connected to the fourth terminal of the operational amplifier through the sixth resistor. The OFF terminal receives a signal or voltage from the sixth resistor and is connected to the fourth terminal of the operational amplifier through the sixth resistor. The OFF terminal monitors or controls the signal or voltage transmitted from the sixth resistor, ensuring that the shutdown operation or the working state of the operational amplifier can be performed when needed. The processed signal or voltage is fed back to the fourth terminal of the operational amplifier through the sixth resistor to achieve control or adjustment of the state of the operational amplifier.

[0079] It should be noted that the power input terminal is also connected to the fifth terminal of the operational amplifier. After receiving the voltage provided by the power input terminal, the operational amplifier uses this voltage as the power supply basis for amplifying the control signal and maintaining the working state inside the operational amplifier.

[0080] The second resistor is also connected to the second terminal of the operational amplifier and grounded, and the fourth resistor is also connected to the second terminal of the operational amplifier and grounded. The second resistor and the fourth resistor are used to provide a stable reference voltage for the second terminal of the operational amplifier and ensure that the current in the circuit is properly limited and distributed. Further, the second resistor and the fourth resistor receive voltage from the second terminal of the operational amplifier and process the voltage through resistance division. The second resistor and the fourth resistor can jointly divide and limit the voltage at the second terminal of the operational amplifier to ensure that the second terminal of the operational amplifier obtains a stable voltage. The processed voltage is maintained at the second terminal of the operational amplifier, providing a stable input reference for the normal operation of the operational amplifier.

[0081] In addition, the operational amplifier is a general operational amplifier. The power input terminal is divided by the first resistor and the second resistor, and the voltage signal after division is sent to the non-inverting input terminal of the operational amplifier through the fifth resistor. At the same time, the power input terminal is also divided by the third resistor and the fourth resistor, and the voltage signal after division is also sent to the inverting input terminal of the operational amplifier through the fifth resistor. The fifth resistor and the sixth resistor in the circuit are used to design and control the hysteresis, to enhance the stability and anti-interference ability of the circuit. The output terminal of the operational amplifier is used to control the shutdown of the post-PWM controller. According to actual needs, it can be designed to output high level to shut down the PWM controller, or designed to output low level to shut down the PWM controller.

[0082] The target diode is designed completely in the circuit design and PCB layout design. In the physical assembly process, it is selectively mounted in one of the positions.

[0083] As Figure 2As shown, when the target diode is placed between the first pin and the ON / OFF terminal of the operational amplifier, if the ON / OFF terminal is high or floating, the voltage at the first pin of the non-inverting input of the operational amplifier is higher than the voltage at the third pin of the inverting input through the values ​​of the first, second, third, and fourth resistors. At this time, the output of the operational amplifier is high, and the subsequent PWM controller is turned off, which is positive logic control. If the ON / OFF terminal is high or floating, and the output of the operational amplifier is low, the subsequent PWM controller works normally, which is negative logic control.

[0084] like Figure 3 As shown, when the target diode is positioned between the third pin and the ON / OFF terminal of the operational amplifier, if the ON / OFF terminal is high or floating, the voltage at the third pin of the inverting input of the operational amplifier is higher than the voltage at the first pin of the non-inverting input through the values ​​of the first, second, third, and fourth resistors. At this time, the output of the operational amplifier is low, and the subsequent PWM controller works normally, which is negative logic control. If the ON / OFF terminal is high and the output of the operational amplifier is high, the subsequent PWM controller is turned off, which is positive logic control.

[0085] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A circuit compatible with positive and negative logic control, characterized by, Comprising: an operational amplifier, a target diode, a power input terminal and an ON / OFF terminal; the target diode is arranged between the first pin of the operational amplifier and the ON / OFF terminal, or the target diode is arranged between the third pin of the operational amplifier and the ON / OFF terminal; when the target diode is arranged between the first pin of the operational amplifier and the ON / OFF terminal, the conducting end of the target diode is also connected to the power input terminal; when the target diode is arranged between the third pin of the operational amplifier and the ON / OFF terminal, the ON / OFF terminal is also connected to the power input terminal.

2. The circuit for compatible positive and negative logic control according to claim 1, wherein, Further comprising: a first resistor; when the target diode is arranged between the first pin of the operational amplifier and the ON / OFF terminal, the first resistor is connected to the power input terminal, the conducting end of the target diode and the first pin of the operational amplifier respectively; when the target diode is arranged between the third pin of the operational amplifier and the ON / OFF terminal, the first resistor is connected to the power input terminal, the ON / OFF terminal and the first pin of the operational amplifier respectively.

3. The circuit for compatible positive and negative logic control of claim 2, wherein, Further comprising: a second resistor; when the target diode is arranged between the first pin of the operational amplifier and the ON / OFF terminal, the second resistor is connected to the first resistor, the conducting end of the target diode and the first pin of the operational amplifier respectively; when the target diode is arranged between the third pin of the operational amplifier and the ON / OFF terminal, the second resistor is connected to the first resistor, the ON / OFF terminal and the first pin of the operational amplifier respectively.

4. The circuit of claim 3, wherein, Further comprising: a third resistor; when the target diode is arranged between the first pin of the operational amplifier and the ON / OFF terminal, the third resistor is connected to the power input terminal, the first resistor, the ON / OFF terminal and the third pin of the operational amplifier respectively; when the target diode is arranged between the third pin of the operational amplifier and the ON / OFF terminal, the third resistor is connected to the power input terminal, the first resistor, the conducting end of the target diode and the third pin of the operational amplifier respectively.

5. The circuit for compatible positive and negative logic control of claim 4, wherein, Further comprising: a fourth resistor; when the target diode is arranged between the first pin of the operational amplifier and the ON / OFF terminal, the fourth resistor is connected to the third resistor, the ON / OFF terminal, the third pin of the operational amplifier and the second resistor respectively.

6. The circuit of claim 5, wherein, when the target diode is arranged between the third pin of the operational amplifier and the ON / OFF terminal, the fourth resistor is connected to the third resistor, the conducting end of the target diode, the third pin of the operational amplifier and the second resistor respectively.

7. The circuit for compatible positive and negative logic control of claim 6, wherein, Further comprising: a fifth resistor; When the target diode is arranged between the first pin of the operational amplifier and the ON / OFF end, the fifth resistor is connected with the first resistor, the conducting end of the target diode, the second resistor and the first pin of the operational amplifier respectively.

8. The positive and negative logic control compatible circuit of claim 7, wherein, When the target diode is arranged between the third pin of the operational amplifier and the ON / OFF end, the fifth resistor is connected with the first resistor, the ON / OFF end, the second resistor and the first pin of the operational amplifier respectively.

9. The positive and negative logic control compatible circuit of claim 8, wherein, Further comprising: a sixth resistor; the sixth resistor is connected with the fifth resistor, the first pin of the operational amplifier and the fourth pin of the operational amplifier respectively.

10. The circuit for compatible positive and negative logic control of claim 9, wherein, Further comprising: an OFF end; the OFF end is connected with the sixth resistor and the fourth pin of the operational amplifier respectively.

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