Warship hand wheel signal conversion circuit

Abstract

The invention relates to a ship hand wheel signal conversion circuit, and belongs to the field of voltage signal conversion. In order to meet the control requirements of special occasions, a pre-amplification circuit, a zeroing circuit, a front-section adjustment circuit and an amplification circuit are respectively arranged; wherein the pre-amplification circuit is used for receiving a hand wheel rotation signal and performing preliminary amplification; the zeroing circuit is used for adjusting the zero position of the hand wheel signal conversion circuit; the front-section adjusting circuit is used for adjusting the inflection point voltage and the front-section voltage slope of the hand wheel signal conversion circuit; the amplification circuit is used for adjusting the total gain of the hand wheel signal conversion circuit. The ship hand wheel signal conversion circuit disclosed by the invention is simple in structure and convenient in parameter setting, and can make up for the functional deficiency in the prior art, thereby effectively improving the precision of the output hand wheel rudder.

Description

Technical Field

[0001] The invention relates to the technical field of voltage signal conversion, and more particularly to a ship handwheel signal conversion circuit. Background Art

[0002] At present, the steering signal of the ship's handwheel usually adopts an ordinary amplifier circuit with zero adjustment and gain adjustment. When this circuit is used, the steering voltage signal emitted by the handwheel changes linearly with the handwheel rotation angle, and the handwheel rotation angle (scale) is proportional to the voltage signal amplitude, such as Figure 1 .

[0003] However, in some special occasions, such as automatic steering wheel for ships, maneuvering requires that the handwheel can be operated with a precise value of several degrees within a small angle range of ± (0°~10°). Figure 2 For example, 4° to the left, 7° to the right, etc., that is, the handwheel rotation angle scale can be enlarged within a small angle range of ±(0°~10°) to be very easy to turn to the specified angle scale, thereby ensuring that the command handwheel operation requirements are quickly completed.

[0004] However, ordinary amplifier circuits are limited in function and cannot meet this requirement, resulting in the inability to meet special operating needs.

[0005] To this end, the present invention provides a ship handwheel signal conversion circuit to overcome the above technical problems. Summary of the invention

[0006] In view of this, the present invention provides a ship handwheel signal conversion circuit, which aims to change the handwheel voltage signal that changes linearly with the handwheel rotation angle into a segmented linear change with the handwheel rotation angle; for example, within a small angle range of ±(0°~10°), the handwheel voltage signal changes linearly with the handwheel rotation angle at a lower slope, and needs to be rotated at a larger angle than an ordinary handwheel; within an angle range of ±(10°~35°), the handwheel voltage signal changes linearly with the handwheel rotation angle at a higher slope, and only needs to be rotated at a smaller angle.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] A ship handwheel signal conversion circuit comprises a pre-amplifier circuit, a zero adjustment circuit, a front-end adjustment circuit and an amplifier circuit; the pre-amplifier circuit is used to receive a handwheel rotation signal and perform preliminary amplification; the zero adjustment circuit is used to adjust the zero position of the handwheel signal conversion circuit; the front-end adjustment circuit is used for the inflection point voltage and the front-end voltage slope of the handwheel signal conversion circuit; the amplifier circuit is used to adjust the total gain of the handwheel signal conversion circuit.

[0009] Furthermore, the pre-amplifier circuit includes a first amplifier, whose inverting input terminal is connected to the handwheel rotation signal through a first resistor, whose non-inverting input terminal is grounded, and whose output terminal is connected to the inverting input terminal of the first amplifier through a sixth resistor.

[0010] Preferably, the positive power supply pin of the first amplifier is connected to +12V and grounded through a first capacitor; the negative power supply pin is connected to -12V and grounded through a second capacitor.

[0011] Further, the zero adjustment circuit is located at the input end of the pre-amplifier circuit;

[0012] The zero adjustment circuit includes a third resistor, a fourth resistor and a fifth resistor connected in series in sequence, wherein the other end of the third resistor is connected to a +12V power supply, the other end of the fifth resistor is connected to a -12V power supply, and the fourth resistor is an adjustable resistor, and the adjustment end is connected to a common node between the inverting input terminal of the first amplifier and the first resistor through the second resistor.

[0013] Further, the front-end adjustment circuit is connected to the output end of the front-end amplifier circuit, and includes a second amplifier, the inverting input end of the second amplifier is connected to the output end of the front-end amplifier circuit through a seventh resistor, the non-inverting input end is grounded, and the output end is reversely connected to the inverting input end of the second amplifier through a third capacitor;

[0014] One end of the third capacitor is connected to the other end through an eighth resistor and a tenth resistor connected in series, wherein the tenth resistor is an adjustable resistor, and the adjustment end is connected to a common node between the eighth resistor and the tenth resistor through a ninth resistor, and the adjustment end is also connected to the other end of the tenth resistor.

[0015] Furthermore, the output end of the second amplifier is connected to a thirteenth resistor and a fourteenth resistor in sequence, the thirteenth resistor is an adjustable resistor, the adjustment end is connected to a common node between the output end of the second amplifier and the thirteenth resistor through the twelfth resistor, and the adjustment end is also connected to a common node between the thirteenth resistor and the fourteenth resistor.

[0016] Furthermore, the output end of the pre-amplifier circuit is connected to the amplifier circuit via an eleventh resistor, and the output end of the front-end adjustment circuit is connected to a common node between the eleventh resistor and the amplifier circuit.

[0017] Further, the amplifying circuit comprises a third amplifier, the inverting input terminal of the third amplifier is connected to the output terminal of the front-end adjustment circuit, and is connected to the output terminal of the front-end amplifier circuit through an eleventh resistor;

[0018] The non-inverting input terminal of the third amplifier is grounded, and the output terminal is reversely connected to the inverting input terminal of the third amplifier through a fourth capacitor; one end of the fourth capacitor is connected to the other end through a fifteenth resistor and a seventeenth resistor connected in series, wherein the seventeenth resistor is an adjustable resistor, and the adjustment end is connected to a common node between the fifteenth resistor and the seventeenth resistor through a sixteenth resistor, and at the same time, the adjustment end is also connected to the other end of the seventeenth resistor.

[0019] Through the above technical scheme, it can be known that the present invention discloses a ship handwheel signal conversion circuit. Compared with the prior art, the circuit parameter setting provided by the present invention is convenient and simple, and has the characteristics of smooth voltage segmented signal transition and reliable circuit; at the same time, by changing the handwheel voltage signal that changes linearly with the handwheel rotation angle to a segmented linear change with the handwheel rotation angle, the requirement for precise control within a small angle range of ± (0°~10°) is met, which can effectively overcome the shortcomings of the prior art, thereby improving the accuracy of the output handwheel steering command. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0021] Figure 1 The accompanying drawing is a schematic diagram of the scale of an existing ship handwheel;

[0022] Figure 2 The attached figure is a schematic diagram of the desired ship hand wheel scale;

[0023] Figure 3 The accompanying drawing is a circuit block diagram of a ship hand wheel signal conversion circuit in the present invention;

[0024] Figure 4 The accompanying drawing is a specific structural diagram of a ship hand wheel signal conversion circuit of the present invention;

[0025] Figure 5 The attached drawing is an auxiliary diagram for explaining the principle of the ship handwheel signal conversion circuit of the present invention. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The embodiment of the present invention discloses a ship handwheel signal conversion circuit, which is respectively provided with a pre-amplifier circuit, a zero adjustment circuit, a front-end adjustment circuit and an amplifier circuit; through the circuit of the present invention, the inflection point voltage and the front-end voltage slope can be flexibly set according to needs, thereby compensating for the functional deficiencies of the existing conversion circuit.

[0028] In an exemplary embodiment, the overall framework of the handwheel signal conversion circuit is shown in FIG. Figure 3 shown.

[0029] Among them, the zero adjustment circuit is used to adjust the zero position of the handwheel signal conversion circuit, so that when there is no input signal or the input signal is zero, the output is also zero;

[0030] The pre-amplifying resistor is used to preliminarily amplify the received handwheel rotation signal;

[0031] The front-end adjustment circuit is used to determine the inflection point voltage of the handwheel signal conversion circuit and the front-end voltage slope according to the needs;

[0032] The amplifier circuit is used to adjust the total gain of the handwheel signal conversion circuit, that is, to change the degree of amplification of the input signal by the circuit.

[0033] Further, if Figure 4 , the specific conversion process is realized by the following circuit:

[0034] First, the pre-amplifier circuit includes a first amplifier N1A, and the inverting input terminal of the first amplifier N1A is connected to the handwheel rotation signal through the first resistor R1. In this embodiment, the first resistor is connected to the potentiometer of the steering handwheel; at the same time, the non-inverting input terminal is grounded, and the output terminal is connected to the inverting input terminal of the first amplifier N1A through the sixth resistor R6.

[0035] Preferably, the positive power pin of the first amplifier N1A is connected to a +12V power supply and is grounded through a first capacitor C1; the negative power pin is connected to a -12V power supply and is grounded through a second capacitor C2.

[0036] Secondly, a zero adjustment circuit is arranged before the pre-amplification circuit;

[0037] Among them, the zero adjustment circuit includes a third resistor R3, a fourth resistor R4 and a fifth resistor R5 connected in series in sequence, and the other end of the third resistor R3 is connected to a +12V power supply, and the other end of the fifth resistor R5 is connected to a -12V power supply. The fourth resistor R4 is an adjustable resistor, and the adjustment end is connected to the common node between the inverting input terminal of the first amplifier N1A and the first resistor R1 through the second resistor R2.

[0038] By changing the voltage at the inverting input terminal of the first amplifier N1A through the fourth resistor, the zero position of the entire circuit can be adjusted.

[0039] To further optimize the above technical solution, the front-end adjustment circuit includes a second amplifier N1C, an inverting input terminal of the second amplifier N1C is connected to the output terminal of the front-end amplifier circuit through a seventh resistor R7, a non-inverting input terminal is grounded, and an output terminal is reversely connected to the inverting input terminal of the second amplifier N1C through a third capacitor C3;

[0040] At the same time, one end of the third capacitor C3 is connected to the other end through an eighth resistor R8 and a tenth resistor R10 connected in series, wherein the tenth resistor R10 is an adjustable resistor, and the adjustment end is connected to a common node between the eighth resistor R8 and the tenth resistor R10 through a ninth resistor R9, and at the same time, the adjustment end is also connected to the other end of the tenth resistor R10.

[0041] By adjusting the resistance value of the tenth resistor R10, the required inflection point voltage can be flexibly adjusted;

[0042] Further, the output end of the second amplifier N1C is connected to the thirteenth resistor R13 and the fourteenth resistor R14 in sequence, wherein the thirteenth resistor R13 is an adjustable resistor, the adjustment end is connected to the common node between the output end of the second amplifier N1C and the thirteenth resistor R13 through the twelfth resistor R12, and the adjustment end is also connected to the common node between the thirteenth resistor R13 and the fourteenth resistor R14.

[0043] The slope of the front-end voltage can be adjusted by adjusting the resistance value of the thirteenth resistor R13.

[0044] In the present application, the handwheel signal conversion circuit also includes an amplifier circuit, and the specific connection relationship is: the output end of the front amplifier circuit is connected to the amplifier circuit through the eleventh resistor R11, and the output end of the front-end adjustment circuit is connected to the common node between the eleventh resistor R11 and the amplifier circuit.

[0045] Preferably, the amplifying circuit comprises a third amplifier N1B,

[0046] That is, the inverting input terminal of the third amplifier N1B is connected to the output terminal of the front-end adjustment circuit, and is also connected to the output terminal of the front-end amplifier circuit through the eleventh resistor R11;

[0047] The non-inverting input terminal of the third amplifier N1B is grounded;

[0048] The output end is reversely connected to the inverting input end of the third amplifier N1B through the fourth capacitor C4; one end of the fourth capacitor C4 is connected to the other end through the fifteenth resistor R15 and the seventeenth resistor R17 connected in series, wherein the seventeenth resistor R17 is an adjustable resistor, and the adjustment end is connected to the common node between the fifteenth resistor R15 and the seventeenth resistor R17 through the sixteenth resistor R16, and at the same time, the adjustment end is also connected to the other end of the seventeenth resistor R17.

[0049] The present invention can adjust the total gain of the entire conversion circuit by adjusting the resistance of the seventeenth resistor R17, and output the required handwheel steering command, that is, the AC voltage value corresponding to the angle of rotation, through the third amplifier N1B.

[0050] Further, refer to Figure 5 , i.e. the schematic diagram of the ship hand wheel signal conversion circuit in the present invention;

[0051] Figure 5 In the figure, straight line a is the voltage VA curve of the Vin input voltage signal after amplification and zero adjustment by the front amplifier circuit (a curve that changes linearly with the hand wheel scale, the same below); curve b is the VB voltage curve of the VA signal after amplification and output by the second operational amplifier N1C of the front adjustment circuit; curve c is the signal curve of the (VA+VB) signal after amplification by the amplifier circuit (for ease of understanding, the signal is not reversed), and curve d is the actual voltage curve of the Vout signal. That is, Vout = -KA·VA-KB·VB, where KA is the voltage gain of the VA signal in the front amplifier circuit, and KB is the voltage gain of the VB signal in the amplifier circuit.

[0052] The front-end adjustment circuit in the present invention utilizes the output characteristics of the rail-to-rail operational amplifier, and the maximum output value of the operational amplifier is the power supply voltage value of the operational amplifier and is limited. Figure 5 As shown, segment b1 of curve b is the normal enlargement of segment a1 (it can also be reduced, which generally refers to enlargement and reduction here), and segment b2 is the line segment after segment a2 is enlarged and limited.

[0053] The rail-to-rail output characteristic of an op amp means that the input signal reaches full amplitude after being amplified by the op amp, i.e., limited amplitude. The full amplitude value is the positive and negative power supply value of the op amp. For example, if the power supply of the op amp is ±12V, the rail-to-rail output value of the op amp is ±12V.

[0054] Since Vout = -KA·VA-KB·VB, for ease of understanding, Figure 4 Assume KA = 1, KB = 1, that is, Vout = -(VA + VB). Curve c is the (VA + VB) curve.

[0055] Because the second amplifier circuit is an inverting amplifier, curve d is a -c curve, and curve d is a Vout curve.

[0056] Furthermore, when the hand wheel is rotated within 10° (-10° is the same), the curve segment c1 = a1 + b1, and when the hand wheel is rotated above 10° (-10° is the same), the curve segment c2 = a2 + b2. That is, curve c (angle is greater than 0°. The same applies to angles less than 0°), that is, composed of two different slopes c1 and c2.

[0057] It can be seen from the Vout curve that at the 10° position of the handwheel, the Vout curve changes its slope and becomes a two-segment slope curve, meeting the requirement that the Vout voltage signal changes linearly with the handwheel rotation angle, and within the ±(0°~10°) angle range, the handwheel voltage signal Vout changes linearly with the handwheel rotation angle with a lower slope, which requires a larger angle rotation than an ordinary handwheel; within the ±(10°~35°) angle range, the handwheel voltage signal changes linearly with the handwheel rotation angle with a higher slope, which requires only a smaller angle rotation (see Figure 3 ), which meets the requirements of some ships for higher accuracy of handwheel steering within the angle range of ±(0°~10°).

[0058] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0059] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A ship handwheel signal conversion circuit, characterized in that: It includes a pre-amplifier circuit, a zero adjustment circuit, a front-end adjustment circuit and an amplifier circuit; the pre-amplifier circuit is used to receive the handwheel rotation signal and perform preliminary amplification; the zero adjustment circuit is used to adjust the zero position of the handwheel signal conversion circuit; the front-end adjustment circuit is used for the inflection point voltage and the front-end voltage slope of the handwheel signal conversion circuit; the amplifier circuit is used to adjust the total gain of the handwheel signal conversion circuit.

2. A ship hand wheel signal conversion circuit according to claim 1, characterized in that: The pre-amplifier circuit includes a first amplifier, an inverting input terminal of the first amplifier is connected to a handwheel rotation signal through a first resistor, a non-inverting input terminal is grounded, and an output terminal is connected to the inverting input terminal of the first amplifier through a sixth resistor.

3. A ship hand wheel signal conversion circuit according to claim 1, characterized in that: The zero adjustment circuit is located at the input end of the pre-amplifier circuit; The zero adjustment circuit includes a third resistor, a fourth resistor and a fifth resistor connected in series in sequence, wherein the other end of the third resistor is connected to a +12V power supply, the other end of the fifth resistor is connected to a -12V power supply, and the fourth resistor is an adjustable resistor, and the adjustment end is connected to a common node between the inverting input terminal of the first amplifier and the first resistor through the second resistor.

4. A ship hand wheel signal conversion circuit according to claim 1, characterized in that: The front-end adjustment circuit is connected to the output end of the front-end amplifier circuit, and includes a second amplifier, the inverting input end of the second amplifier is connected to the output end of the front-end amplifier circuit through a seventh resistor, the non-inverting input end is grounded, and the output end is reversely connected to the inverting input end of the second amplifier through a third capacitor; One end of the third capacitor is connected to the other end through an eighth resistor and a tenth resistor connected in series, wherein the tenth resistor is an adjustable resistor, and the adjustment end is connected to a common node between the eighth resistor and the tenth resistor through a ninth resistor, and the adjustment end is also connected to the other end of the tenth resistor.

5. A ship hand wheel signal conversion circuit according to claim 4, characterized in that: The output end of the second amplifier is connected to the thirteenth resistor and the fourteenth resistor in sequence, the thirteenth resistor is an adjustable resistor, the adjustment end is connected to the common node between the output end of the second amplifier and the thirteenth resistor through the twelfth resistor, and the adjustment end is also connected to the common node between the thirteenth resistor and the fourteenth resistor.

6. A ship hand wheel signal conversion circuit according to claim 1, characterized in that: The output end of the pre-amplifier circuit is connected to the amplifier circuit through the eleventh resistor, and the output end of the front-end adjustment circuit is connected to a common node between the eleventh resistor and the amplifier circuit.

7. A ship hand wheel signal conversion circuit according to claim 6, characterized in that: The amplifying circuit comprises a third amplifier, wherein the inverting input terminal of the third amplifier is connected to the output terminal of the front-end adjusting circuit and is connected to the output terminal of the front-end amplifying circuit through an eleventh resistor; The non-inverting input terminal of the third amplifier is grounded, and the output terminal is reversely connected to the inverting input terminal of the third amplifier through a fourth capacitor; one end of the fourth capacitor is connected to the other end through a fifteenth resistor and a seventeenth resistor connected in series, wherein the seventeenth resistor is an adjustable resistor, and the adjustment end is connected to a common node between the fifteenth resistor and the seventeenth resistor through a sixteenth resistor, and at the same time, the adjustment end is also connected to the other end of the seventeenth resistor.

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