CN110243401B - Photoelectric cell of optical encoder and decoding device of optical magnetic encoder - Google Patents
Photoelectric cell of optical encoder and decoding device of optical magnetic encoder Download PDFInfo
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- CN110243401B CN110243401B CN201910683237.7A CN201910683237A CN110243401B CN 110243401 B CN110243401 B CN 110243401B CN 201910683237 A CN201910683237 A CN 201910683237A CN 110243401 B CN110243401 B CN 110243401B
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- G01D5/54—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using means specified in two or more of groups G01D5/02, G01D5/12, G01D5/26, G01D5/42, and G01D5/48
- G01D5/56—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using means specified in two or more of groups G01D5/02, G01D5/12, G01D5/26, G01D5/42, and G01D5/48 using electric or magnetic means
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Abstract
The invention discloses a photocell of a light encoder, wherein an operational amplifier single-ended output circuit and a comparator circuit are at least integrated in the photocell; the forward and reverse sine signals and the forward and reverse cosine signals generated based on the optical signals are processed through the operational amplifier single-ended output circuit and the comparator respectively, so that the photocell can directly output sine signals, cosine signals, sine digital signals and cosine digital signals; meanwhile, the forward sine signal, the reverse sine signal, the forward cosine signal and the reverse cosine signal which are not processed by the operational amplifier single-ended output circuit and the comparator can be output. The photocell in the application realizes various processing to the sine and cosine signal, reduces the quantity of the connecting circuit between the photocell and the processor, further simplifies the circuit structure on the circuit board, and is favorable for the miniaturized application of the encoder. The invention also provides a decoding device of the magneto-optical encoder, which has the beneficial effects.
Description
Technical Field
The invention relates to the technical field of encoder signal processing, in particular to a photocell of an optical encoder and a decoding device of an optical magnetic encoder.
Background
An encoder is a device that converts angular displacement or linear displacement into an electrical signal, and detects changes in optical, magnetic, or electrical signals with rotation of a rotating shaft mainly by an inductive component such as a photosensor, a magnetic induction sensor, or an inductive component, and determines the amount of displacement of the rotation based on the changes.
In processing and calculating optical signals, magnetic signals and electric signals, circuit chips with various loads need to be adopted, and therefore, a large number of chip components need to be arranged on a circuit board of the encoder. The chip circuit on the circuit board is complicated.
Disclosure of Invention
The invention aims to provide a photocell of an optical encoder and a decoding device of a photomagnetic hybrid encoder, which simplify the structure of circuit elements in the encoder and are reasonable for the miniaturization development of the encoder.
In order to solve the technical problem, the invention provides a photocell of an optical encoder, wherein the photocell is used for receiving an optical signal sent by a light source through a code channel and generating a forward sine signal, a reverse sine signal, a forward cosine signal and a reverse cosine signal according to the optical signal;
the photovoltaic cell is at least integrated with an operational amplifier single-ended output circuit and a comparator circuit;
the photocell comprises a sine signal output port, a forward sine signal output port, a reverse sine signal output port, a sine digital signal output port, a cosine signal output port, a forward cosine signal output port, a reverse cosine signal output port and a cosine digital signal output port;
the operational amplifier single-ended output circuit is used for processing the forward sinusoidal signal and the reverse sinusoidal signal and outputting a sinusoidal signal through the sinusoidal signal output port; the output port is used for outputting a cosine signal to the forward cosine signal and the reverse cosine signal;
the comparator circuit is used for processing the forward sine signal and the reverse sine signal and outputting a sine digital signal through the sine digital signal output port; the cosine conversion module is also used for outputting cosine digital signals to the forward cosine signals and the reverse cosine signals through the cosine digital signal output port;
the forward sine signal output port, the reverse sine signal output port, the forward cosine signal output port and the reverse cosine signal output port are respectively used for outputting a forward sine signal, a reverse sine signal, a forward cosine signal and a reverse cosine signal.
The sinusoidal signal output port comprises a main code channel sinusoidal signal output port, a segment code sinusoidal signal output port and a vernier code sinusoidal signal output port;
the forward sinusoidal signal output port and the reverse sinusoidal signal output port are respectively a main code forward sinusoidal signal output port and a main code reverse sinusoidal signal output port;
the sinusoidal digital signal output port comprises a main code sinusoidal digital signal output port, a segment code sinusoidal digital signal output port and a vernier code sinusoidal digital signal output port;
the cosine signal output port comprises a main code channel cosine signal output port, a segment code cosine signal output port and a vernier code cosine signal output port;
the forward cosine signal output port and the reverse cosine signal output port are respectively a main code forward cosine signal output port and a main code reverse cosine signal output port;
the cosine digital signal output port comprises a main code cosine digital signal output port, a segment code cosine digital signal output port and a vernier code cosine digital signal output port.
The photovoltaic cell is further integrated with two operational amplifier differential circuits;
the operational amplifier differential circuit is used for respectively processing a main code forward sinusoidal signal and a main code reverse sinusoidal signal generated according to the optical signal, and respectively outputting the main code differential forward sinusoidal signal and the main code differential reverse sinusoidal signal after differential operation through the forward sinusoidal signal output port and the reverse sinusoidal signal output port;
and the other operational amplifier differential circuit is used for processing a main code forward cosine signal and a main code reverse cosine signal generated according to the optical signal, and respectively outputting the main code differential forward cosine signal and the main code differential reverse cosine signal after differential operation through the forward cosine signal output port and the reverse cosine signal output port.
The invention also provides a decoding device of the magneto-optical encoder, which comprises the photocell, the processor and the magnetic field induction chip;
the processor is used for being connected with the sine signal output port, the forward sine signal output port, the reverse sine signal output port, the sine digital signal output port, the cosine signal output port, the forward cosine signal output port, the reverse cosine signal output port and the cosine digital signal output port of the photocell, being connected with the magnetic induction chip, and calculating the absolute position according to the output signal of the photocell and the output signal of the magnetic induction chip.
The main code forward sine signal output port and the main code reverse sine signal output port of the photocell, and the main code forward cosine signal output port and the main code reverse cosine signal output port are respectively connected with the processor through two external differential circuits.
The magnetic field induction chip comprises a second magnetic induction chip arranged at the center of the magnetic steel of the magneto-optical encoder and two orthogonal first magnetic induction chips arranged at the edge of the magnetic steel.
And the output port of the second magnetic induction chip is connected with the processor through an external differential circuit.
The first magnetic induction chip is an AMR chip, and the second magnetic induction chip is any one of a TMR chip, a GMR chip, an AMR chip or a first magnetic induction chip.
The photocell of the optical encoder provided by the invention is at least integrated with an operational amplifier single-ended output circuit and a comparator circuit; the forward sine signal, the reverse sine signal, the forward cosine signal and the reverse cosine signal generated based on the optical signal are processed through the operational amplifier single-ended output circuit and the comparator respectively, so that the photocell can directly output the sine signal, the cosine signal, the sine digital signal and the cosine digital signal; meanwhile, the forward sine signal, the reverse sine signal, the forward cosine signal and the reverse cosine signal which are not processed by the operational amplifier single-ended output circuit and the comparator can be output.
The photocell in the application can output sine signals, cosine signals, sine digital signals and cosine digital signals, forward sine signals, reverse sine signals, forward cosine signals, reverse cosine signals and other signals, various processing on the sine signals and the reverse cosine signals is realized, the processing process of signals output by the photocell in the subsequent absolute position resolving process is simplified, the number of connecting circuits between the photocell and a processor is reduced, further, the circuit structure on a circuit board is simplified, and the miniaturized application of an encoder is facilitated.
The invention also provides a decoding device of the magneto-optical encoder, which has the beneficial effects.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a circuit framework for a photovoltaic cell according to an embodiment of the present invention;
FIG. 2 is a block diagram of a decoding apparatus of an optomagnetic encoder according to an embodiment of the present invention;
FIG. 3 is a schematic view of a connection structure of a photovoltaic cell and a processor according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a magnetic encoding component of the magneto-optical encoder according to an embodiment of the present invention;
fig. 5 is a schematic view of a connection structure between a processor and a magnetic induction chip according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, fig. 1 is a schematic diagram of a circuit framework of a photovoltaic cell according to an embodiment of the present invention. The photovoltaic cell may specifically include:
the photocell 10 is used for receiving an optical signal sent by a light source through a code channel and generating a forward sine signal, a reverse sine signal, a forward cosine signal and a reverse cosine signal according to the optical signal; the photovoltaic cell is characterized in that an operational amplifier single-ended output circuit 11 and a comparator circuit 12 are at least integrated in the photovoltaic cell 10;
the photocell 10 comprises a sine signal output port, a forward sine signal output port, a reverse sine signal output port, a sine digital signal output port, a cosine signal output port, a forward cosine signal output port, a reverse cosine signal output port and a cosine digital signal output port;
the operational amplifier single-ended output circuit 11 is used for processing the forward sinusoidal signal and the reverse sinusoidal signal and outputting the sinusoidal signal through a sinusoidal signal output port; the output port of the cosine signal is used for outputting a cosine signal to the forward cosine signal and the reverse cosine signal;
the comparator circuit 12 is configured to process the forward sinusoidal signal and the reverse sinusoidal signal, and output a sinusoidal digital signal through a sinusoidal digital signal output port; the cosine conversion module is also used for outputting cosine digital signals to the forward cosine signals and the reverse cosine signals through the cosine digital signal output port;
the forward sine signal output port, the reverse sine signal output port, the forward cosine signal output port and the reverse cosine signal output port are respectively used for outputting a forward sine signal, a reverse sine signal, a forward cosine signal and a reverse cosine signal.
The light transmitted through the code track of the code wheel is received by the photocell 10, and accordingly analog signals, i.e., a forward sine signal, an inverse sine signal, a forward cosine signal, and an inverse cosine signal, can be generated, as shown in fig. 1, and can be respectively represented by sin +, sin-, cos +, and cos-.
The conventional photocell directly outputs the analog signals after generating the four analog signals. However, the processor for calculating the absolute position based on the signal output by the photocell cannot directly calculate the analog signal, and therefore, a corresponding circuit element needs to be added between the photocell and the processor for performing various different arithmetic processing on the analog model. The circuit element, the photocell and the processor are arranged in a circuit board of the encoder, the area of the circuit board is limited, and if the requirement on the accuracy of the absolute position calculated by the processor is higher, the middle circuit element for processing the analog signal is more complex, the area of the circuit board is correspondingly required to be larger, the size of the encoder is larger, and the application requirement on the miniaturization development of the encoder in the industry is not met.
For this purpose, the operational amplifier single-ended output circuit 11 and the comparator circuit 12 are integrated in the photovoltaic cell 10 in the present application. The operational amplifier single-ended output circuit 11 is equivalent to an amplifying circuit, and can output a sinusoidal signal corresponding to a signal obtained by amplifying the amplitude of a forward sinusoidal signal by 2 times, based on the forward sinusoidal signal and the reverse sinusoidal signal. Similarly, the cosine signal and the forward cosine signal output by the operational amplifier single-ended output circuit 11 have the same corresponding relationship.
The operational amplifier single-ended output circuit 11 is a circuit structure that exists in the prior art, and in this embodiment, this circuit structure is merely integrated into the photovoltaic cell, so the specific circuit structure thereof is not specifically described in this application.
The comparator circuit 12 outputs a sine digital signal mainly by comparing the magnitudes of the forward sine signal and the reverse sine signal; similarly, the pre-digital signal is also obtained by comparing the forward cosine signal and the inverse cosine signal. The comparator circuit 12, specifically a comparator, is a circuit element which is commonly used at present, and will not be described in detail here.
It should be noted that, in the present application, a forward sine signal, a reverse sine signal, a forward cosine signal, and a reverse cosine signal need to be processed respectively; in an actual circuit, an operational amplifier single-ended output circuit and a comparator circuit are required to be configured for each group of forward sinusoidal signals and reverse sinusoidal signals; each group of forward cosine signal and reverse cosine signal is provided with an operational amplifier single-ended output circuit 11 and a comparator circuit 12; that is, the operational amplifier single-ended output circuit 11 and the comparator circuit 12 for the forward and reverse sine signals and the forward and reverse cosine signals are not shared.
In addition, in order to improve the resolving accuracy of the absolute position, the processor often needs to obtain an analog signal, so that the photocell 10 in the present application outputs the photoelectric signal processed by the operational amplifier single-ended output circuit 11 and the comparator circuit 12, and then outputs analog signals such as a forward sine signal, an inverse sine signal, a forward cosine signal, and an inverse cosine signal, so as to meet different resolving requirements of the processor.
In summary, in the present application, the operational amplifier single-ended output circuit 11 and the comparator circuit 12 are integrated in the photocell 10, so that the signal processing capability of the photocell 10 is improved to a certain extent, and further, circuit elements between the processor and the photocell 101 are reduced, and on the basis of ensuring that the processor can calculate the absolute position with high precision, the distribution structure of the circuit elements on the circuit board is simplified, which meets the development trend of miniaturization of the encoder.
To further explain the technical solution of the present invention, a photocell for an optical signal of a cursor track having a three-turn track will be taken as an example. Specifically, referring to fig. 1, the photocell in fig. 1 is a block diagram of a chip structure for a cursor code.
Specifically, in a specific embodiment of the present invention, the method may include:
six operational amplifier single-end output circuits 11 and six comparator circuits 12 are integrated in the photocell 10;
the sinusoidal signal output port comprises a main code channel sinusoidal signal output port, a segment code sinusoidal signal output port and a vernier code sinusoidal signal output port;
the forward sinusoidal signal output port and the reverse sinusoidal signal output port are respectively a main code forward sinusoidal signal output port and a main code reverse sinusoidal signal output port;
the sinusoidal digital signal output port comprises a main code sinusoidal digital signal output port, a segment code sinusoidal digital signal output port and a vernier code sinusoidal digital signal output port;
the cosine signal output port comprises a main code channel cosine signal output port, a segment code cosine signal output port and a vernier code cosine signal output port;
the forward cosine signal output port and the reverse cosine signal output port are respectively a main code forward cosine signal output port and a main code reverse cosine signal output port;
the cosine digital signal output port comprises a main code cosine digital signal output port, a segment code cosine digital signal output port and a vernier code cosine digital signal output port
It should be noted that the cursor track includes a main track M, a segment track N and a cursor track S.
The signal generated according to the main code channel M includes a main code M _ sin + (i.e., a main code forward sine signal), a main code M _ sin- (i.e., a main code reverse sine signal), a main code M _ cos + (i.e., a main code forward cosine signal), and a main code M _ cos- (i.e., a main code reverse cosine signal);
similarly, the signal generated from the segment code channel N includes the segment code N _ sin +, the segment code N _ sin-, the segment code N _ cos +, and the segment code N _ cos-;
the signal generated according to the cursor track S comprises cursor code S _ sin +, cursor code S _ sin-, cursor code S _ cos +, cursor code S _ cos-.
When the processor performs calculation according to the photocell, a reticle phase angle with high accuracy needs to be calculated according to the main code M _ sin +, the main code M _ sin-, the main code M _ cos +, and the main code M _ cos-; without using analog signals for the segment code channel N and the cursor code channel S. Therefore, among the output ports of the photocell 10, the output port for the signal of the main code channel M includes a main code sine signal port output M _ sin, a main code forward sine signal port output M _ sin +, a main code reverse sine signal port output M _ sin-, and a main code cosine digital signal port output M _ sin _ Pulse; correspondingly, the preset signal is also four signals output by the corresponding four output ports, and for a specific port output mode, reference may be made to fig. 1 and a related output mode of the sine corresponding signal, which is not described herein again.
For the segment code channel N, only the segment code sine signal output port outputs N _ sin (i.e., segment code sine signal), the segment code sine digital signal output port outputs N _ sin _ Pulse (i.e., segment code sine digital signal), the segment code cosine signal output port outputs N _ cos (i.e., segment code cosine signal), and the segment code cosine digital signal output port outputs N _ cos _ Pulse (i.e., segment code cosine digital signal); similarly, only the ports for outputting the cursor code S _ sin, the cursor code S _ sin _ Pulse, the cursor code S _ cos, and the cursor code S _ cos _ Pulse are required for the cursor track S, and the description thereof is not repeated.
In addition, referring to fig. 1, in the photovoltaic cell 10, an operational amplifier single-ended output circuit 11 and a comparator circuit 12 are required to be respectively configured for each pair of forward and reverse sine signals generated according to the optical signal and each pair of forward and reverse cosine signals generated according to the optical signal. Therefore, the photocell 10 is integrated with 6 operational amplifier single-ended output circuits 11 and 6 comparator circuits 12, which respectively process six pairs of signals, namely, forward and reverse sine signals of the main code channel M, forward and reverse cosine signals of the main code channel M, forward and reverse sine signals of the segment code channel N, forward and reverse cosine signals of the segment code channel N, forward and reverse sine signals of the vernier code channel S and forward and reverse cosine signals of the vernier code channel S.
As mentioned above, when the processor calculates the absolute position according to the output signal of the photocell 10, if the requirement for the accuracy of the calculation result is high, the analog signals of the main code M _ sin +, the main code M _ sin-, the main code M _ cos +, the main code M _ cos-, etc. of the main code track need to be obtained. However, the processor cannot directly solve the four signals, and the processor can perform differential operation only after performing differential operation on the four analog signals through the differential circuit, that is, the differential circuit needs to be configured between the processor and the photovoltaic cell. In order to further simplify the structure of the circuit element in the present application, in another embodiment of the present invention, the method may further include:
the photocell 10 is also integrated with two operational amplifier differential circuits 13;
an operational amplifier differential circuit 13 is used for processing the main code forward sinusoidal signal and the main code reverse sinusoidal signal generated according to the optical signal, and respectively outputting the main code differential forward sinusoidal signal and the main code differential reverse sinusoidal signal after differential operation through a forward sinusoidal signal output port and a reverse sinusoidal signal output port;
and the other operational amplifier differential circuit processes a main code forward cosine signal and a main code reverse cosine signal generated according to the optical signal, and respectively outputs the main code differential forward cosine signal and the main code differential reverse cosine signal after differential operation through a forward cosine signal output port and a reverse cosine signal output port.
Specifically, as shown in fig. 1, two operational amplifier differential circuits 13 are integrated in the photovoltaic cell 10, and are used for respectively processing two groups of signals, namely a main code forward sine signal and a main code reverse sine signal, and a forward cosine signal and a main code reverse cosine signal.
It should be noted that the operational amplifier differential circuit 13 may be integrated in the photovoltaic cell 10 of the present invention, or the operational amplifier differential circuit 13 may not be integrated in the photovoltaic cell. If the operational amplifier differential circuit 13 is not integrated in the photocell 10, the forward sine signal output port, the reverse sine signal output port, the forward cosine signal output port and the reverse cosine signal output port can directly and respectively output analog signals of a main code M _ sin +, a main code M _ sin-, a main code M _ cos +, a main code M _ cos-, and the like generated according to the optical signal; if the operational amplifier differential circuit 13 is integrated in the photovoltaic cell, analog signals such as a main code M _ sin +, a main code M _ sin-, a main code M _ cos +, a main code M _ cos-, and the like generated according to the optical signals need to be processed by the operational amplifier differential circuit 13, and then are output from the forward sine signal output port, the reverse sine signal output port, the forward cosine signal output port, and the reverse cosine signal output port respectively.
The integration of the operational amplifier differential circuit 13 in the photovoltaic cell 10 is a preferred embodiment in the present application, and the photovoltaic cell 10 in the present invention may also be a chip without the integration of the operational amplifier differential circuit 13, for which, the implementation of the technical solution in the present invention is not affected, so both embodiments should fall within the protection scope of the present application.
Fig. 2 shows a block diagram of a decoding apparatus of a magneto-optical encoder according to an embodiment of the present invention, where fig. 2 is a block diagram of a structure of the decoding apparatus of the magneto-optical encoder according to the embodiment of the present invention. The decoding apparatus may include:
the photovoltaic cell 10, the processor 20, the magnetic field sensing chip 30 as described in any of the above embodiments;
the processor 30 is connected to the sine signal output port, the forward sine signal output port, the reverse sine signal output port, the sine digital signal output port, the cosine signal output port, the forward cosine signal output port, the reverse cosine signal output port, and the cosine digital signal output port of the photocell, connected to the magnetic induction chip 30, and used for calculating the absolute position according to the output signal of the photocell 10 and the output signal of the magnetic induction chip 30.
For the magneto-optical hybrid encoder, the magneto-optical hybrid encoder has the advantages of strong pollution resistance and interference resistance of the magnetic encoder and the advantage of high measurement accuracy of the magneto-optical hybrid encoder. However, compared with a pure optical encoder, the photoelectric hybrid encoder also has circuit elements corresponding to the magnetic encoder, and further increases the circuit elements on the circuit board. Therefore, the photocell 10 at least integrated with the operational amplifier single-ended output circuit 11 and the comparator circuit 12 is adopted in the embodiment, which is beneficial to simplification of circuit elements of the magneto-optical encoder, so that the problems of more circuit elements and complex layout in the magneto-optical encoder are solved, and the magneto-optical encoder is beneficial to wide application.
Optionally, in another specific embodiment of the present invention, the method may further include:
the main code forward sine signal output port and the main code reverse sine signal output port, and the main code forward cosine signal output port and the main code reverse cosine signal output port of the photocell 10 are respectively connected with the processor 20 through two external differential circuits 40.
Referring to fig. 3, a connection relationship between the photovoltaic cell 10 and the processor 20 may be referred to, and fig. 3 is a schematic diagram of a connection structure between the photovoltaic cell and the processor according to an embodiment of the present invention.
It should be noted that, the photocell 10 in fig. 3 is applied to the encoder of the cursor code track, and because there are many output ports of the whole circuit diagram, the sine signal output port, the sine digital signal output port, the cosine signal output port, and the cosine digital signal output port of the main code track M are omitted in fig. 3, in practical application, these four output ports may exist, and the four ports are also directly connected with the processor 20.
Specifically, as shown in fig. 3, the main code forward sine signal output port and the main code reverse sine signal output port are commonly connected to an external differential circuit, and the main code forward cosine signal output port and the main code reverse cosine signal output port are commonly connected to an external differential circuit 40.
As mentioned above, in the embodiment where the photoelectric track is a cursor track, when the absolute position is calculated according to the signal output by the photoelectric cell 10, if the analog signal of the main track M, i.e. the main code M _ sin +, the main code M _ sin-, the main code M _ cos +, and the main code M _ cos-, needs to be obtained with higher accuracy. For the photovoltaic cell 10 not having the operational amplifier differential circuit 13, it is necessary to configure a differential circuit to process the analog signal and input the processed analog signal to the processor 20, that is, to configure an external differential circuit 40 for connecting the photovoltaic cell 10 and the processor 20.
It should be noted that, in the present application, the operational amplifier differential circuit 13 integrated in the photovoltaic cell 10 and the external differential circuit 40 have the same function, and therefore, the circuit structures thereof are also the same and similar, and can be adjusted adaptively according to the actual application, but the basic circuit principles thereof may be the same.
However, for the photocell 10 with the operational amplifier differential circuit 13 built in, there may be a discrepancy between the requirement of the operational amplifier differential circuit 13 integrated in the photocell 10 for the differential operation of the analog signal of the main code channel M and the requirement of the processor 20 for the differential operation due to, for example, the amplification factor of the differential operation, and different parameter settings in the circuit. In this case, therefore, an external differential circuit 40 may also be provided between the analog signal output port of the main code channel M of the photovoltaic cell 10 and the processor 20 to meet the operational requirements.
Of course, if the analog signal of the main code channel M output by the operational amplifier differential circuit 13 built in the photovoltaic cell 10 is consistent with the signal required by the processor 20 for calculation, the outputs of the photovoltaic cell 10 can be directly connected to the processor 20 without being connected through the external differential circuit 40.
Optionally, in another specific embodiment of the present invention, the method may further include:
the magnetic field induction chip 30 comprises a first magnetic induction chip 31 arranged at the center of the magnetic steel facing the magneto-optical encoder and two orthogonal second magnetic induction chips 32 arranged at the edge of the magnetic steel facing the magneto-optical encoder.
Specifically, the first magnetic induction chip is an AMR chip, and the second magnetic induction chip is any one of a TMR chip, a GMR chip, an AMR chip, or a first magnetic induction chip. Of course, other embodiments with chips having similar functions are not excluded from the present invention.
As shown in fig. 4, fig. 4 is a schematic structural diagram of a magnetic encoding component in an optomagnetic encoder according to an embodiment of the present invention. Magnet steel is circular magnet among figure 4, comprises semi-circular N utmost point and semi-circular S utmost point, and on the rotation center axle of magnet steel was located to AMR chip 31, two Hall chips set up at magnet steel border position, and the measuring direction all is parallel with the tangential direction of magnet steel, and two Hall chips' S measuring direction mutually perpendicular, and then realize the quadrature measurement of the two. In fig. 4, an AMR chip is shown as the first magnetic sensing chip 31, and a hall chip is shown as the second magnetic sensing chip 32, which is not described again.
In addition, every time the magnetic steel rotates for one circle, two Hall chips respectively output a periodic square wave signal, and the difference between the two square wave signals is 90 degrees;
the AMR chip is used for outputting two periods of sine signals and two periods of cosine signals when the magnetic steel rotates for one circle.
If the circular magnetic steel is divided into four sector areas of 90 degrees, the current absolute position is in different sector areas, and the high and low levels output by the two second magnetic induction chips 32 have different combinations; accordingly, according to the combination of the different high and low levels output by the two second magnetic induction chips 32, the sine and cosine signals of the current position corresponding to the several periods output by the first magnetic induction chip 31 can be determined, and then the absolute position value can be calculated.
Although the first magnetic induction chip 31 can only output sine and cosine signals of one period when the magnetic steel rotates for one circle, and at the moment, the absolute position can be calculated without adopting the second magnetic induction chip 32 to detect the change of the magnetic field, the accuracy of the absolute position calculated by the calculation method is lower. Therefore, the embodiment of combining two second magnetic induction chips 32 and one first magnetic induction chip 31 is a preferred embodiment.
Optionally, in another specific embodiment of the present invention, the method may further include:
the output port of the first magnetic induction chip 31 is connected with the processor 20 through an external differential circuit 40.
Specifically, as shown in fig. 5, fig. 5 is a schematic view of a connection structure between a processor and a magnetic induction chip according to an embodiment of the present invention.
Since the first magnetic sensor chip 31 outputs the sine and cosine analog signals, in order to enable the processor 20 to calculate a more accurate absolute position, the external differential circuit 40 needs to be disposed between the first magnetic sensor chip 31 and the processor 20, and of course, the external differential circuit 40 in this application may also be integrated in the first magnetic sensor chip 31, which is not limited in the present invention.
As shown in fig. 3 and 5, the external differential circuit 40 between the first magnetic sensor chip 31 and the processor 20 and the external differential circuit 40 between the photovoltaic cell 10 and the processor 20 have the same circuit structure, and specific circuit parameters can be selected according to actual situations.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Claims (7)
1. A photocell of an optical encoder is used for receiving an optical signal sent by a light source through a code channel and generating a forward sine signal, a reverse sine signal, a forward cosine signal and a reverse cosine signal according to the optical signal; the photovoltaic cell is characterized in that an operational amplifier single-ended output circuit and a comparator circuit are at least integrated in the photovoltaic cell;
the photocell comprises a sine signal output port, a forward sine signal output port, a reverse sine signal output port, a sine digital signal output port, a cosine signal output port, a forward cosine signal output port, a reverse cosine signal output port and a cosine digital signal output port;
the operational amplifier single-ended output circuit is used for processing the forward sinusoidal signal and the reverse sinusoidal signal and outputting a sinusoidal signal through the sinusoidal signal output port; the device is also used for processing the forward cosine signal and the reverse cosine signal and outputting a cosine signal through the cosine signal output port;
the comparator circuit is used for processing the forward sine signal and the reverse sine signal and outputting a sine digital signal through the sine digital signal output port; the cosine module is also used for processing the forward cosine signal and the reverse cosine signal and outputting a cosine digital signal through the cosine digital signal output port;
the forward sine signal output port, the reverse sine signal output port, the forward cosine signal output port and the reverse cosine signal output port are respectively used for outputting a forward sine signal, a reverse sine signal, a forward cosine signal and a reverse cosine signal;
the sinusoidal signal output port comprises a main code channel sinusoidal signal output port, a segment code sinusoidal signal output port and a vernier code sinusoidal signal output port;
the forward sinusoidal signal output port and the reverse sinusoidal signal output port are respectively a main code forward sinusoidal signal output port and a main code reverse sinusoidal signal output port;
the sinusoidal digital signal output port comprises a main code sinusoidal digital signal output port, a segment code sinusoidal digital signal output port and a vernier code sinusoidal digital signal output port;
the cosine signal output port comprises a main code channel cosine signal output port, a segment code cosine signal output port and a vernier code cosine signal output port;
the forward cosine signal output port and the reverse cosine signal output port are respectively a main code forward cosine signal output port and a main code reverse cosine signal output port;
the cosine digital signal output port comprises a main code cosine digital signal output port, a segment code cosine digital signal output port and a vernier code cosine digital signal output port.
2. The photocell for an optical encoder according to claim 1, further integrated with two operational amplifier differential circuits;
the operational amplifier differential circuit is used for respectively processing a main code forward sinusoidal signal and a main code reverse sinusoidal signal generated according to the optical signal, and respectively outputting the main code differential forward sinusoidal signal and the main code differential reverse sinusoidal signal after differential operation through the forward sinusoidal signal output port and the reverse sinusoidal signal output port;
and the other operational amplifier differential circuit is used for processing a main code forward cosine signal and a main code reverse cosine signal generated according to the optical signal, and respectively outputting the main code differential forward cosine signal and the main code differential reverse cosine signal after differential operation through the forward cosine signal output port and the reverse cosine signal output port.
3. A decoding device for a magneto-optical encoder, comprising a photocell according to claim 1 or 2, a processor, a magneto-sensitive chip;
the processor is used for being connected with the sine signal output port, the forward sine signal output port, the reverse sine signal output port, the sine digital signal output port, the cosine signal output port, the forward cosine signal output port, the reverse cosine signal output port and the cosine digital signal output port of the photocell, is connected with the magnetic induction chip, and carries out absolute position calculation according to the output signal of the photocell and the output signal of the magnetic induction chip.
4. The decoding device of the magneto-optical encoder as claimed in claim 3, wherein the main code forward sine signal output port and the main code reverse sine signal output port, and the main code forward cosine signal output port and the main code reverse cosine signal output port of the photocell are respectively connected to the processor through two external differential circuits.
5. The decoding device of the magneto-optical encoder as claimed in claim 3, wherein the magnetic sensor chip comprises a first magnetic sensor chip disposed at a center position facing the magnetic steel of the magneto-optical encoder and two orthogonal second magnetic sensor chips disposed at edge positions facing the magnetic steel.
6. The decoding apparatus of an optomagnetic encoder as claimed in claim 5, wherein the output port of the second magnetic sensing chip is connected to the processor through an external differential circuit.
7. The decoding device of magneto-optical encoder according to claim 5, wherein the first magnetic sensing chip is an AMR chip, and the second magnetic sensing chip is any one of a TMR chip, a GMR chip, and an AMR chip.
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| CN201910683237.7A CN110243401B (en) | 2019-07-26 | 2019-07-26 | Photoelectric cell of optical encoder and decoding device of optical magnetic encoder |
| PCT/CN2019/102987 WO2021017073A1 (en) | 2019-07-26 | 2019-08-28 | Photocell for optical encoder and decoding apparatus for optical magnetic encoder |
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