CN204392210U - A kind of code signal change-over circuit - Google Patents

Abstract

The utility model discloses a coded signal conversion circuit, which at least includes: a power supply circuit, a shaping circuit, a pulse width adjusting circuit, and a magnetic encoder analog circuit; wherein, the shaping circuit, the pulse width adjusting circuit, and the magnetic encoder analog circuit are respectively connected. The power supply circuit is used to supply power to the encoding signal conversion circuit; the shaping circuit is used to shape the input photoelectric encoder signal, and outputs the shaped two-way square wave signal to the pulse width adjustment circuit; it is used to shape the shaped signal. A pulse width adjustment circuit for signal frequency division by two, and its output terminal is connected to a magnetic encoder analog circuit; a magnetic encoder analog circuit for coupling and voltage division of the signal processed by the pulse width adjustment circuit, coupling and voltage division The final signal outputs the magnetic encoder signal. The utility model can collect two-way photoelectric encoder signals and convert them into magnetic encoder signals.

Description

A coded signal conversion circuit

technical field

The utility model relates to a data signal conversion circuit technology, in particular to a coding signal conversion circuit.

Background technique

At present, there are two types of encoders used in depth sensors used in well logging: photoelectric encoders and magnetic encoders. The performances of the two encoders have their own advantages and disadvantages. The resolution of the general magnetic encoder is about 0.5 cm, and the accuracy of the photoelectric encoder is an order of magnitude higher than that of the magnetic encoder, so it can achieve high-precision depth tracking. On semi-submersible platforms, the application of photoelectric encoders is more common.

For example, in the prior art, the sensor signal acquisition box of Halliburton's Integrated System for Information Technology and Engineering (Insite) is a barrier box (BarrierBox), and its hardware is designed with 4 channels of deep signal processing However, in practical applications, it is found that the DepthWheel (DW) 4 signal cannot be collected. The reason is that the Insite system host does not collect the DW4 signal of the BarrierBox in terms of software and hardware design.

#1DW and #2DW of BarrierBox are used as magnetic encoder signals to count, while #3DW and #4DW are used as photoelectric encoder signals to count. Since the principles of the two encoders are not nearly the same, the acquisition circuits cannot be mixed.

The photoelectric encoder is a type of sensor with a photoelectric code disc with a central shaft, on which there is a ring-shaped dark and dark line, and a photoelectric emitting and receiving device to read and obtain signals. It is mainly used to measure displacement or angle.

The material of the photoelectric encoder code disc is glass, metal, and plastic. The glass code disc deposits very thin reticles on the glass, and the metal code disc is directly marked with pass and no pass. The magnetoelectric encoder adopts a magnetoelectric design, which generates and provides the absolute position of the rotor through magnetic induction devices and changes in the magnetic field, and uses magnetic devices to replace the traditional code disc.

The design of the circuit interface of the two encoders is also different: the two encoders are four-wire system, and the wiring of the magnetic encoder is wiring A+, wiring A-, wiring B+, wiring B-, while the photoelectric encoder The wiring is +5V power line, ground wire GND, wiring A, wiring B.

Since the equipment used in the prior art generally only has one photoelectric encoding signal acquisition circuit available, it cannot track the main depth (Block) and the compensation depth (Riser) at the same time, so the depth tracking of the semi-submersible platform cannot be accurately completed, so that the photoelectric encoder The characteristics of high precision cannot be brought into play.

Utility model content

In order to solve the above-mentioned technical problems, the utility model provides a coding signal conversion circuit, which can collect two photoelectric coding signals and convert the photoelectric encoder signals, so as to improve the situation that only one photoelectric coding signal acquisition circuit is available in the existing equipment. So as to accurately complete the depth tracking of the semi-submersible platform.

In order to achieve the purpose of the present invention, a coded signal conversion circuit provided by the utility model at least includes:

Power supply circuit, shaping circuit, pulse width adjustment circuit, magnetic encoder simulation circuit; among them,

A power supply circuit connected to the shaping circuit, the pulse width adjustment circuit and the magnetic encoder analog circuit respectively, for supplying power to the encoding signal conversion circuit;

A shaping circuit for shaping the input photoelectric encoder signal, and output the shaped two-way square wave signal to the pulse width adjustment circuit;

A pulse width adjustment circuit for performing frequency division by two on the shaped signal, the output end of which is connected to the analog circuit of the magnetic encoder;

The magnetic encoder analog circuit is used to couple and divide the signal processed by the pulse width adjustment circuit, and the coupled and divided signal outputs the magnetic encoder signal.

Optionally, the utility model also includes a phase detection circuit, the input end of the phase detection circuit is connected to the output end of the pulse width adjustment circuit, and the output end of the phase detection circuit outputs a forward pulse signal and a reverse pulse signal respectively, The phase detection circuit is also connected with the power supply circuit.

Optionally, the power supply circuit includes a step-down element, the input voltage of the step-down element is +16V, and the output voltage is +5V.

Optionally, the step-down element is LM7805.

Optionally, the shaping circuit includes a pull-up resistor Ra, a pull-up resistor Rb, a first trigger and a second trigger, and the input photoelectric encoder signal includes pulse signal A and pulse signal B of the photoelectric encoder signal , the pulse signal A is connected to one end of the pull-up resistor Ra and the input end of the first flip-flop at the same time, the pulse signal B is connected to one end of the pull-up resistor Rb and the input end of the second flip-flop at the same time, and the shaping The output signal of the circuit is two-way square wave signal which is opposite to the input signal.

Optionally, the first flip-flop and the second flip-flop are Schmitt triggers 74LS14.

Optionally, the pulse width adjustment circuit includes a counter element that divides the square wave signal by two.

Optionally, the counter element is 74LS193.

Optionally, the phase detection circuit includes a D flip-flop, a first NAND gate and a second NAND gate, the first input terminal of the D flip-flop, the shaped and frequency-divided pulse signal A The pulse signal A processing signal and one input end of the first NAND gate are connected to each other, and the other input end of the first NAND gate is connected to the 1Q output end of the D flip-flop; the D flip-flop The clock input terminal, the pulse signal B processed by shaping and frequency-dividing the processed signal of the pulse signal B, and one input terminal of the second NAND gate are connected to each other, and the other input terminal of the second NAND gate is connected to The 1Q non-output terminal of the D flip-flop is connected; the output signals of the first NAND gate and the second NAND gate are forward pulse signal and reverse pulse signal respectively.

Optionally, the magnetic encoder analog circuit includes an optocoupler, a load resistor and a parallel resistor connected in parallel with the load resistor, the primary of the optocoupler is connected to the pulse signal A processing signal and the pulse signal B processing signal, so The secondary of the optocoupler is connected to the load resistor and the parallel resistor connected in parallel with the load resistor, and the output signal of the magnetic encoder analog circuit is connected to the two terminals B+ and B- of the magnetic encoder.

Compared with the prior art, the utility model at least includes a power supply circuit, a shaping circuit, a pulse width adjustment circuit, and a magnetic encoder analog circuit; wherein, the power supply circuit is used to supply power to the coded signal conversion circuit, and is respectively connected with the shaping circuit, the pulse width The adjustment circuit is connected with the analog circuit of the magnetic encoder; the shaping circuit is used to shape the input photoelectric encoder signal, and outputs the shaped two-way square wave signal to the pulse width adjustment circuit; the pulse width adjustment circuit is used for shaping After the signal is divided by two, the frequency of the processed signal becomes 1/2 of the original signal, the duty cycle is adjusted to 50%, and its output terminal is connected with the magnetic encoder analog circuit; the magnetic encoder analog circuit is used for After the signal processed by the pulse width adjustment circuit is coupled and divided, the magnetic encoder signal is output. In the utility model, the collected two-way photoelectric encoder signals are reshaped by the shaping circuit, and then the pulse width adjustment circuit is used for two-way frequency division processing, and finally the two-way magnetic encoder signals are output through the coupling and voltage division of the magnetic encoder analog circuit. . The utility model converts the photoelectric encoder signal, which can convert the photoelectric encoder signal into a magnetic encoder signal, so that the system realizes the acquisition of dual-channel photoelectric encoding signals, thereby accurately completing the depth tracking of the semi-submersible platform.

Other features and advantages of the present invention will be set forth in the following description, and, in part, will be apparent from the description, or can be learned by practicing the present invention. The objectives and other advantages of the utility model can be realized and obtained by the structures particularly pointed out in the specification, claims and accompanying drawings.

Description of drawings

The accompanying drawings are used to provide a further understanding of the technical solution of the utility model, and constitute a part of the description, together with the embodiments of the application, are used to explain the technical solution of the utility model, and do not constitute a limitation to the technical solution of the utility model.

Fig. 1 is the functional block diagram of the encoded signal conversion circuit of an embodiment of the present invention;

Fig. 2 is the functional block diagram of the encoded signal conversion circuit of another embodiment of the present invention;

Fig. 3 is the schematic diagram of the power supply circuit in the utility model embodiment;

Fig. 4 is the schematic diagram of the shaping circuit in the utility model embodiment;

Fig. 5 is the functional schematic diagram of the Schmitt trigger in the utility model embodiment;

6 is a schematic diagram of a pulse width adjustment circuit in an embodiment of the present invention;

Fig. 7 is the schematic diagram of the phase detection circuit in the utility model embodiment;

Fig. 8 is a schematic diagram of the analog circuit of the magnetic encoder in the embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model clearer, the embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

Fig. 1 is the functional block diagram of the coding signal conversion circuit of one embodiment of the utility model, as shown in Fig. The device analog circuit 104; wherein,

The power supply circuit 101 is used to supply power to the encoding signal conversion circuit, and is respectively connected to the shaping circuit 102, the pulse width adjustment circuit 103 and the magnetic encoder analog circuit 104;

The shaping circuit 102 is used to shape the input photoelectric encoder signal, and output the shaped two-way square wave signal to the pulse width adjustment circuit 103;

The pulse width adjustment circuit 103 is used to divide the frequency by two on the signal after shaping, the frequency of the processed signal becomes 1/2 of the original signal, and the duty cycle is adjusted to 50%. Its output terminal is connected with the magnetic encoder analog circuit 104 connected;

The magnetic encoder analog circuit 104 is used to couple and divide the signal processed by the pulse width adjustment circuit 103 to output the magnetic encoder signal. The signal is input to the acquisition circuit of the existing equipment, thereby being received by the existing equipment.

In the embodiment of the utility model, since the collected two-way photoelectric encoder signals are shaped by the shaping circuit, and then processed by the pulse width adjustment circuit for two-way frequency division, and finally through the coupling and voltage division of the magnetic encoder analog circuit, the output two-way The magnetic encoder signal realizes the acquisition of two photoelectric encoder signals at the same time, and converts the photoelectric encoder signal into a magnetic encoder signal, so that the depth data can be converted and collected through the magnetic encoder signal acquisition circuit.

Fig. 2 is the functional block diagram of the coded signal conversion circuit of another embodiment of the utility model, as shown in Fig. 2, further, the utility model also comprises phase detection circuit 201, is used for detecting the working condition of whole circuit, phase detection circuit The input end of 201 is connected with the output end of pulse width adjustment circuit 103, the output end of phase detection circuit 201 outputs forward pulse signal and reverse pulse signal respectively, and phase detection circuit 201 is also connected with power supply circuit 101 to obtain working power.

Fig. 3 is the schematic diagram of the power supply circuit in the embodiment of the utility model, further, as shown in Fig. 3, the power supply circuit 101 comprises step-down element 301, and the input voltage IN of step-down element 301 is +16V, and the output voltage OUT is +5V.

Optionally, the step-down element 301 is, for example, the LM7805 of National Semiconductor. In one embodiment, the power supply circuit 101 uses +16V of the existing equipment as the power input, and then outputs +5V through the LM7805 as the system power supply.

Fig. 4 is the schematic diagram of the shaping circuit in the embodiment of the utility model, as shown in Fig. 4, shaping circuit 102 comprises pull-up resistor Ra, pull-up resistor Rb, first flip-flop 401 and second flip-flop 402, input The photoelectric encoder signal includes pulse signal A and pulse signal B of the photoelectric encoder signal. Wherein, the pulse signal A is connected with one end of the pull-up resistor Ra and the input end of the first flip-flop 401 at the same time, and the pulse signal B is connected with one end of the pull-up resistor Rb and the input end of the second flip-flop 402 at the same time, and the shaping circuit 102 The output signal is two-way square wave signal opposite to the input signal.

Optionally, the first flip-flop 401 and the second flip-flop 402 are Schmitt triggers, such as 74LS14 of Motorola (MOTOROLA). Fig. 5 is a functional schematic diagram of the Schmitt trigger in the embodiment of the present invention. As shown in Fig. 5, a Schmitt trigger 74LS14 is used to shape the initial input photoelectric signal input to make it output a regular square wave signal output . The Schmitt trigger also has two stable states, but unlike the general trigger, the Schmitt trigger adopts the potential trigger mode, and its state is maintained by the input signal potential; for two different directions of negative decreasing and positive increasing For the input signal, the Schmitt trigger has different threshold voltages V _T- and V _T+ .

In the simulation software environment, the circuit is simulated by software, and the input and output can meet the design requirements.

Fig. 6 is the schematic diagram of the pulse width adjustment circuit in the embodiment of the present invention, the pulse width adjustment circuit 103 comprises two sets of circuits, each set of circuits comprises a counter element, respectively carries out two-way frequency division processing to the two-way square wave signal, as As shown in FIG. 6 , one set of circuits includes a counter element 601 for frequency-dividing one channel of square wave signal by two.

Optionally, the counter element 601 is, for example, 74LS193 of Motorola. The two counter elements can be selected from the same model.

Specifically, in actual situations, the pulse signal is too high in frequency and the pulse width is narrow. When the pulse signal is distorted, it is easy for the digital signal processor to be unable to correctly distinguish between pulse signal A and pulse signal B when processing the pulse signal. The phase of , so that the direction of depth tracking error. Therefore, it is necessary to adjust the pulse width to achieve an ideal duty cycle. In one embodiment, the counter 74LS193 is used to divide the signal by two, the frequency of the processed signal becomes 1/2 of the original signal, and the duty cycle is adjusted to 50%, although the resolution of the depth signal is reduced by 50% , but it is necessary to reduce the resolution within an acceptable range under the premise of pursuing stability.

It can be seen in the simulation software that after the pulse signal is divided by two, a square wave signal with a duty cycle of 50% and a very ideal waveform can be obtained.

Fig. 7 is the schematic diagram of the phase detector circuit in the utility model embodiment, as shown in Fig. 7, phase detector circuit 201 comprises D flip-flop 701 and first NAND gate 702 and second NAND gate 703, D flip-flop The first input terminal 1D of 701, the pulse signal A processed signal after shaping and frequency division of the pulse signal A, and an input terminal 1 of the first NAND gate 702 are connected to each other, and the other input terminal of the first NAND gate 702 2 connected to the 1Q output terminal of the D flip-flop 701; the clock input terminal CP of the D flip-flop 701, the pulse signal B processed by shaping and frequency division of the pulse signal B, and an input terminal 5 of the second NAND gate 703 The other input terminal 4 of the second NAND gate 703 is connected with the 1Q non-output terminal of the D flip-flop 701; the output signals of the first NAND gate 702 output terminal 3 and the second NAND gate 703 output terminal 6 are respectively It is a forward pulse signal and a reverse pulse signal, and the output terminals of the forward pulse signal and the reverse pulse signal are respectively two test points.

The circuit is composed of D flip-flop 701 and two NAND gates, and the rotation direction of the encoder can be judged by looking at the waveform of the test point. When checking the circuit, check whether the phase detection circuit is working normally by rotating the encoder in one direction, so as to detect the working condition of the whole circuit.

The specific implementation principle is as follows: when the D flip-flop is used, it also includes the preset terminal SD and the clear terminal RD, and the SD and RD terminals are set at high level. At this time, when the rising edge of the CP terminal arrives, the state of the D terminal reaches the output terminal Q port. Table 1 below is the D flip-flop function table.

Table 1

In Table 1, H is high level, L is low level, the clock edge is the transition from low to high CP, and Qn+1 is the state after the next transition from low to high clock.

The NAND gate is used as a logic unit, and its truth table is shown in Table 2. Only when the pulse signal A terminal and the pulse signal B terminal input low level at the same time, the output terminal Z is low, otherwise it is high level.

A B Z 0 0 0 0 1 0 1 0 0 1 1 1

Table 2

The pulse signal B is used as the clock signal of the D flip-flop, and the pulse signal A is used as the data input. When the encoder rotates forward, the phase of the pulse signal A is ahead of the pulse signal B, so that the Q1 terminal outputs a high level, and at the same time The terminal outputs a low level; the Q1 terminal is ANDed with the pulse signal A, and the incremental pulse is output from the NAND gate. And because of The terminal is low level, the NAND gate outputs low level, and there is no pulse output. The above signal can be used as the direction indication signal for the forward and reverse rotation of the encoder. The direction signal, pulse signal A, and pulse signal B respectively pass through two NAND gates, so that when the encoder is rotating forward, it can only be detected at the test point of pulse signal A. Pulse and pulse signal B test point has no pulse, otherwise pulse signal B test point has signal, but pulse signal A test point has no signal. By detecting the signal output of these two points, it can be checked whether the whole system is working normally.

Figure 8 is a schematic diagram of the magnetic encoder analog circuit in the embodiment of the present invention, as shown in Figure 8, the magnetic encoder analog circuit 104 includes an optical coupler 801, a load resistor R1 and a parallel resistor R2 connected in parallel with the load resistor, The primary of the optocoupler 801 is connected to the pulse signal A processing signal and the pulse signal B processing signal, the secondary of the optocoupler is connected to the load resistance R1 and the parallel resistance R2 connected in parallel with the load resistance, and the output signal of the magnetic encoder analog circuit 104 is connected to the magnetic The two terminals of the encoder are terminal B+ and terminal B-.

Pulse signal A and pulse signal B are processed by the pulse width adjustment circuit and then coupled to the secondary through the optical coupler 801, changing the resistance value of the load resistor R1 in the secondary magnetic encoder analog circuit 104 to make the voltage on the parallel resistor R2 When the divided voltage changes, a pulse signal is output. The pulse signal is input to the acquisition circuit of the existing equipment and thus received by the system.

The utility model is composed of a logic integrated circuit (integrated circuit, IC for short) and a counter, and does not use a single-chip microcomputer for data processing, so the reliability of the system is high, and the combination with the existing equipment will not increase the instability of the system.

Even so, the utility model is not limited thereto, and it is also within the protection scope of the utility model to realize it by using a single-chip microcomputer or other devices.

The utility model can convert the photoelectric encoder signal into a magnetic encoder signal by collecting two-way photoelectric coding signals and converting the photoelectric encoder signals, so that the system can realize the collection of two-way photoelectric coding signals. Thus, the Insite system has the ability to process two channels of photoelectric encoder signals at the same time, which solves the problem that the Insite system cannot collect the depth data of the compensator on the semi-submersible platform, and improves the tracking accuracy of the depth during the logging while drilling process.

Although the utility model is a technology for converting two-way photoelectric coding signals, the utility model is not limited thereto. For example, the technology of the utility model can also be used to convert one-way photoelectric coding signals or multiple photoelectric coding signals, so as to satisfy Different site needs.

Although the embodiments disclosed in the present utility model are as above, the content described is only an embodiment adopted to facilitate understanding of the present utility model, and is not intended to limit the present utility model. Anyone skilled in the field of the utility model can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed by the utility model, but the patent protection scope of the utility model , must still be subject to the scope defined by the appended claims.

Claims (10)

1. A coded signal conversion circuit, comprising at least: the device comprises a power supply circuit, a shaping circuit, a pulse width adjusting circuit and a magnetic encoder analog circuit; wherein,

the power supply circuit is respectively connected with the shaping circuit, the pulse width adjusting circuit and the magnetic encoder analog circuit and is used for supplying power to the encoding signal conversion circuit;

the shaping circuit is used for shaping the input photoelectric encoder signal and outputting the two paths of shaped square wave signals to the pulse width adjusting circuit;

the pulse width adjusting circuit is used for performing frequency halving processing on the shaped signal, and the output end of the pulse width adjusting circuit is connected with the magnetic encoder analog circuit;

and the magnetic encoder analog circuit is used for coupling and dividing the voltage of the signal processed by the pulse width adjusting circuit, and the coupled and divided signal outputs a magnetic encoder signal.

2. The encoded signal conversion circuit according to claim 1, further comprising a phase detection circuit, an input terminal of which is connected to an output terminal of the pulse width adjustment circuit, and output terminals of which respectively output a forward pulse signal and a reverse pulse signal;

the power supply circuit is also used for being connected with the phase identification circuit and supplying power to the phase identification circuit.

3. The encoded signal conversion circuit according to claim 1, wherein the power supply circuit includes a voltage-reducing element having an input voltage of +16V and an output voltage of + 5V.

4. The encoded signal conversion circuit of claim 3, wherein the voltage dropping element is LM 7805.

5. The encoded signal conversion circuit of claim 1, wherein the shaping circuit comprises a pull-up resistor Ra, a pull-up resistor Rb, a first flip-flop and a second flip-flop, the input optical encoder signal comprises a pulse signal a and a pulse signal B of the optical encoder signal, the pulse signal a is connected to one end of the pull-up resistor Ra and an input end of the first flip-flop, the pulse signal B is connected to one end of the pull-up resistor Rb and an input end of the second flip-flop, and an output signal of the shaping circuit is a two-way square wave signal inverted to the input signal.

6. The encoded signal conversion circuit of claim 5, wherein the first flip-flop and the second flip-flop are Schmitt flip-flops 74LS 14.

7. The encoded signal conversion circuit according to claim 1, wherein the pulse width adjustment circuit includes a counter element that divides the square wave signal by two.

8. The encoded signal conversion circuit of claim 7, wherein the counter element is 74LS 193.

9. The encoding signal conversion circuit according to claim 2, wherein the phase detection circuit comprises a D flip-flop, a first nand gate and a second nand gate, a first input terminal of the D flip-flop, a pulse signal a processed signal obtained by shaping and frequency dividing the pulse signal a, and one input terminal of the first nand gate are connected to each other, and the other input terminal of the first nand gate is connected to a 1Q output terminal of the D flip-flop; the clock input end of the D trigger, a pulse signal B processing signal obtained by shaping and frequency dividing the pulse signal B and one input end of the second NAND gate are connected with each other, and the other input end of the second NAND gate is connected with the 1Q non-output end of the D trigger; the output signals of the first NAND gate and the second NAND gate are a forward pulse signal and a reverse pulse signal respectively.

10. The encoded signal conversion circuit of claim 1, wherein the magnetic encoder analog circuit comprises an optocoupler, a load resistor, and a parallel resistor in parallel with the load resistor, the primary of the optocoupler coupling the pulse signal a processed signal and the pulse signal B processed signal, the secondary of the optocoupler coupling the load resistor and the parallel resistor in parallel with the load resistor, and the output signal of the magnetic encoder analog circuit coupling the two terminals B + and B-of the magnetic encoder.