A pitch feedback regulating circuit for a controllable pitch propeller

Abstract

The utility model discloses a kind of pitch feedback regulation circuit of pitch adjusting oar, it is related to the technical field of electrical control, comprising: circuit includes: reference power supply, signal acquisition circuit, filter following circuit, range adjustment circuit;Reference power supply provides stable voltage, signal acquisition circuit is output proportional voltage signal with pitch position by pitch potentiometer;Filter following circuit passes through filter unit and first operational amplifier, the signal is inverted and amplified as unipolar negative voltage signal, as pitch feedback signal output to range adjustment circuit;Range adjustment circuit passes through second operational amplifier and potentiometer P2 adjustment signal range, output feedback signal reflecting pitch full stroke state.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electrical control, more particularly to a pitch feedback adjusting circuit of pitch propeller. BACKGROUND

[0002] In the ship propulsion system, the pitch adjustment of the pitch propeller is an important factor affecting the ship maneuvering performance and energy efficiency. By changing the angle of the propeller blade, the pitch propeller can provide the best propulsion efficiency under different working conditions. However, the signal feedback quality in the pitch adjustment process directly affects the response accuracy and stability of the pitch propeller.

[0003] The traditional pitch feedback circuit mainly uses analog signals for transmission and adjustment, which is easily affected by external electromagnetic interference, leading to signal distortion and affecting the control accuracy of the pitch propeller. In addition, the feedback signal adjustment range of the traditional circuit is limited, which cannot meet the accurate adjustment requirements of the pitch from the maximum reverse to the maximum forward. SUMMARY

[0004] The utility model aims at providing a pitch feedback adjusting circuit of pitch propeller, which can realize stable collection and accurate adjustment of pitch feedback signals.

[0005] The technical scheme of the utility model is to provide a pitch feedback adjusting circuit of pitch propeller based on frequency signal transmission, which comprises a reference power supply, a signal acquisition circuit, a filter following circuit and a range adjustment circuit.

[0006] The reference power supply comprises an output end, an input end and a ground end.

[0007] The signal acquisition circuit comprises a pitch potentiometer, one fixed contact of which is connected to the output section of the reference power supply, and the other fixed contact is grounded. The sliding contact is connected to the filter following circuit, and outputs a voltage signal proportional to the pitch position.

[0008] The filter following circuit comprises a filter unit and a first operational amplifier.

[0009] The filter following circuit receives the voltage signal proportional to the pitch position, and inputs the first operational amplifier after the filter unit. The first operational amplifier inverts and amplifies the input signal, and outputs a unipolar negative voltage signal as the pitch feedback signal to the range adjustment circuit.

[0010] The range adjustment circuit comprises a second operational amplifier and a second potentiometer P2.

[0011] The second potentiometer P2 is connected in parallel between the negative input terminal and the output terminal of the second operational amplifier, and the sliding contact of the second potentiometer P2 is connected with a fixed contact to adjust the range of the feedback signal.

[0012] In any of the technical solutions above, further, the filtering and following circuit comprises a resistor R1, a resistor R2 and a capacitor C1; the resistor R1 and the resistor R2 are connected in series between the sliding contact of the pitch potentiometer and the negative input terminal of the first operational amplifier, and one end of the capacitor C1 is connected between the resistor R1 and the resistor R2, and the other end is grounded.

[0013] In any of the technical solutions above, further, the filtering and following circuit further comprises a resistor R3, a resistor R4 and a resistor R7.

[0014] The positive input terminal of the first operational amplifier is connected in series with the resistor R3 and grounded, the negative input terminal of the first operational amplifier is connected in parallel with the resistor R4 between the negative input terminal and the output terminal of the first operational amplifier, and the output terminal of the first operational amplifier is connected to the negative input terminal of the second operational amplifier through the resistor R7.

[0015] In any of the technical solutions above, further, the range adjusting circuit further comprises a first potentiometer P1, a resistor R5, a resistor R6, a resistor R8 and a diode D3.

[0016] The sliding contact of the first potentiometer P1 is connected between the resistor R7 and the negative input terminal of the second operational amplifier through the resistor R6, one fixed contact of the first potentiometer P1 is grounded, and the other fixed contact is connected to the output terminal of the reference power supply through the resistor R5.

[0017] The positive input terminal of the second operational amplifier is grounded through the resistor R8, and the diode D3 and the second potentiometer P2 are connected in parallel between the negative input terminal and the output terminal of the second operational amplifier, wherein the anode of the diode D3 is connected with the negative input terminal of the second operational amplifier.

[0018] The beneficial effects of the utility model are as follows:

[0019] In the utility model, the reference power supply provides stable voltage, ensures that the signal output by the pitch potentiometer accurately reflects the pitch position, and reduces the feedback error caused by power supply fluctuation.

[0020] The filtering and following circuit of the utility model effectively filters the high-frequency noise in the signal, inverts and amplifies the signal through the first operational amplifier, ensures the smoothness and stability of the output signal, and improves the quality of the feedback signal; the range adjusting circuit can accurately feedback and adjust in the full stroke range from the maximum reverse to the maximum forward through the second operational amplifier and the potentiometer P2, ensures the linear output of the pitch feedback signal, and meets the control requirements of different pitch positions.

[0021] The utility model discloses circuit design is simple, can realize using conventional component, has stronger operability, is suitable for widely used in the ship variable pitch propeller system, and convenient maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0022] The advantages of the above and additional aspects of the utility model will become apparent and will be readily understood in view of the following description of embodiments, taken in conjunction with the accompanying drawings, in which:

[0023] Figure 1 It is the structural schematic diagram of the variable pitch propeller pitch feedback regulation circuit based on frequency signal transmission according to an embodiment of the utility model. DETAILED DESCRIPTION

[0024] In order to more clearly understand the above purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the drawings and specific embodiments. It should be noted that the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

[0025] In the following description, a lot of specific details are set forth in order to fully understand the utility model, however, the utility model can also be implemented in other ways different from the description, therefore, the protection scope of the utility model is not limited by the specific embodiments disclosed below.

[0026] As Figure 1 The embodiment provides a variable pitch propeller pitch feedback regulation circuit based on frequency signal transmission, and the circuit comprises a reference power supply, a signal acquisition circuit, a filter following circuit and a range adjustment circuit.

[0027] In the embodiment, the reference power supply uses a reference power supply chip AD581, and comprises an output end, an input end and a ground end.

[0028] The signal acquisition circuit comprises a pitch potentiometer, one fixed contact point of the pitch potentiometer is connected to the output section of the reference power supply, another fixed contact point is grounded, a sliding contact point is connected to the filter following circuit, and an output voltage signal proportional to the pitch position is output.

[0029] The filter following circuit comprises an RC filter circuit composed of a resistor R1, a resistor R2 and a capacitor C1 and a first operational amplifier, wherein the RC filter circuit is used for filtering high-frequency noise in the signal;The resistor R1 and the resistor R2 are connected in series between the sliding contact point of the pitch potentiometer and the negative input end of the first operational amplifier, one end of the capacitor C1 is connected between the resistor R1 and the resistor R2, and the other end is grounded, forming a low-pass filter, and providing a smooth and stable voltage output signal.

[0030] The filter following circuit further comprises a resistor R3, a resistor R4 and a resistor R7.

[0031] The filtered voltage signal enters the first operational amplifier through the negative input terminal, the positive input terminal of the first operational amplifier is connected with the ground through the resistor R3 in series, and the resistor R4 is connected between the negative input terminal and the output terminal of the first operational amplifier in parallel.

[0032] The negative input terminal of the first operational amplifier receives the filtered signal, the first operational amplifier inverts and amplifies the input signal, and outputs a single-polarity negative voltage signal as the pitch feedback signal to the range adjustment circuit.

[0033] The range adjustment circuit comprises a second operational amplifier, a first potentiometer P1, a second potentiometer P2, a resistor R5, a resistor R6, a resistor R8 and a diode D3.

[0034] The output terminal of the first operational amplifier is connected to the negative input terminal of the second operational amplifier through the resistor R7, the sliding contact of the first potentiometer P1 is connected between the resistor R7 and the negative input terminal of the second operational amplifier through the resistor R6, one fixed contact of the first potentiometer P1 is connected to the ground, and the other fixed contact is connected to the output terminal of the reference power supply through the resistor R5; the first potentiometer P1 is used for adjusting the minimum value of the pitch feedback signal, when the pitch of the pitch adjusting propeller is at the maximum reverse position, the first potentiometer P1 adjusts the feedback signal to make the output signal reach the required minimum value (generally a negative voltage); accurately controlling the size of the minimum value can ensure that the pitch feedback signal can correctly reflect the pitch adjustment state at the reverse position.

[0035] The positive input terminal of the second operational amplifier is connected to the ground through the resistor R8, and the diode D3 and the second potentiometer P2 are connected in parallel between the negative input terminal and the output terminal of the second operational amplifier, respectively, wherein the anode of the diode D3 is connected to the negative input terminal of the second operational amplifier; the forward conduction of the diode D3 enables the positive voltage signal to be smoothly conducted when passing through, while being blocked at negative voltage, which ensures that the positive signal in the full-range range adjustment circuit can be correctly transmitted to the output circuit, further ensuring the accuracy and reliability of the feedback signal.

[0036] The sliding contact of the second potentiometer P2 is connected with one fixed contact, and the second potentiometer P2 functions as a variable resistor; the second potentiometer P2 is used for adjusting the range of the feedback signal to ensure that the feedback signal can cover the pitch change from the maximum reverse to the maximum forward.

[0037] The second operational amplifier is mainly used for inverting proportional amplification and addition operation of the input signal in the circuit; the negative input end thereof receives a single-polarity pitch feedback negative voltage signal from the filter following circuit and a positive voltage signal provided by the potentiometer P1, the two signals are subjected to addition operation at the negative input end, and the second operational amplifier generates a new feedback voltage signal reflecting the state of the pitch in the full stroke range.

[0038] In conclusion, the utility model provides a kind of pitch feedback regulation circuit of pitch adjusting paddle based on frequency signal transmission, comprising: reference power supply, signal acquisition circuit, filter following circuit, range regulation circuit.

[0039] The reference power supply includes an output end, an input end and a ground end.

[0040] The signal acquisition circuit includes a pitch potentiometer, one fixed contact of the pitch potentiometer is connected to the output section of the reference power supply, the other fixed contact is grounded, and the sliding contact is connected to the filter following circuit, outputting a voltage signal proportional to the pitch position.

[0041] The filter following circuit includes a filter unit and a first operational amplifier.

[0042] The filter following circuit receives the voltage signal proportional to the pitch position, inputs the first operational amplifier after the filter unit, the first operational amplifier inverts and amplifies the input signal, and outputs a single-polarity negative voltage signal as a pitch feedback signal output to the range regulation circuit.

[0043] The range regulation circuit includes a second operational amplifier and a second potentiometer P2.

[0044] The second potentiometer P2 is connected in parallel between the negative input end and the output end of the second operational amplifier, the sliding contact of the second potentiometer P2 is connected to a fixed contact, and the range of the feedback signal is adjusted; the second operational amplifier outputs a new feedback voltage signal reflecting the state of the pitch in the full stroke range.

[0045] In the utility model, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, "connection" can be fixed connection, or detachable connection, or integrally connected; "connection" can be directly connected, or indirectly connected through an intermediate medium. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific situation.

[0046] The shapes of various components in the drawings are schematic, and there may be some differences with the actual shapes, the drawings are only used to illustrate the principles of the utility model, and are not intended to limit the utility model.

[0047] Although the utility model is disclosed in detail with reference to the drawings, it should be understood that the description is merely exemplary and is not intended to limit the application of the utility model. The protection scope of the utility model is defined by the appended claims and can include various modifications, alterations and equivalent solutions made to the utility model without departing from the protection scope and spirit of the utility model.

Claims

1. A pitch feedback regulation circuit for a controllable pitch propeller, characterized by The circuit comprises a reference power supply, a signal acquisition circuit, a filter following circuit, a range adjustment circuit; The reference power supply comprises an output end, an input end and a ground end; The signal acquisition circuit comprises a pitch potentiometer, one fixed contact of the pitch potentiometer is connected to the output end of the reference power supply, the other fixed contact is grounded, the sliding contact is connected to the filter following circuit, and the filter following circuit outputs a voltage signal proportional to the pitch position; The filter following circuit comprises a filter unit and a first operational amplifier; The filter following circuit receives the voltage signal proportional to the pitch position, inputs the first operational amplifier after the filter unit, the first operational amplifier inverts and amplifies the input signal, and outputs a unipolar negative voltage signal as a pitch feedback signal to the range adjustment circuit; The range adjustment circuit comprises a second operational amplifier and a second potentiometer P2; The second potentiometer P2 is connected in parallel between the negative input end and the output end of the second operational amplifier, the sliding contact of the second potentiometer P2 is connected to one fixed contact, the range of the feedback signal is adjusted, and the second operational amplifier outputs a new feedback voltage signal reflecting the state of the pitch in the full stroke range.

2. The pitch feedback regulation circuit for a pitch regulated propeller of claim 1, wherein, The filter unit of the filter following circuit comprises a resistor R1, a resistor R2 and a capacitor C1; the resistor R1 and the resistor R2 are connected in series between the sliding contact of the pitch potentiometer and the negative input end of the first operational amplifier, one end of the capacitor C1 is connected between the resistor R1 and the resistor R2, and the other end is grounded.

3. The pitch feedback regulation circuit for a pitch regulated propeller of claim 1, wherein, The filter following circuit further comprises a resistor R3, a resistor R4 and a resistor R7; The positive input end of the first operational amplifier is connected in series with the resistor R3 and grounded, the negative input end and the output end of the first operational amplifier are connected in parallel with the resistor R4, and the output end of the first operational amplifier is connected to the negative input end of the second operational amplifier through the resistor R7.

4. The pitch feedback regulation circuit for a pitch regulated propeller of claim 3, wherein, The range adjustment circuit further comprises a first potentiometer P1, a resistor R5, a resistor R6, a resistor R8 and a diode D3; The sliding contact of the first potentiometer P1 is connected between the resistor R7 and the negative input end of the second operational amplifier through the resistor R6, one fixed contact of the first potentiometer P1 is grounded, and the other fixed contact is connected to the output end of the reference power supply through the resistor R5; The positive input end of the second operational amplifier is grounded through the resistor R8, the diode D3 and the second potentiometer P2 are connected in parallel between the negative input end and the output end of the second operational amplifier, and the anode of the diode D3 is connected to the negative input end of the second operational amplifier.

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