CN107797950A

CN107797950A - A kind of real-time reading circuit of encoder

Info

Publication number: CN107797950A
Application number: CN201610733863.9A
Authority: CN
Inventors: 璧典凯; 赵俭
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-08-28
Filing date: 2016-08-28
Publication date: 2018-03-13

Abstract

A kind of real-time reading circuit of encoder, suitable for the communications field.Reading circuit is turned normal signal circuit, LCD1602 configuration circuits and serial communication configuration circuit and formed by voltage conversion circuit, the main string pattern configuration circuits of spartan6, differential signal.Circuit structure is compact, small volume, working stability, and adaptability is good, improves operating efficiency, low in energy consumption, and has good anti-interference and reliability, can obtain stable angle value output.

Description

A kind of real-time reading circuit of encoder

Art

The present invention relates to a kind of real-time reading circuit of encoder, suitable for the communications field.

Background technology

Encoder is to work out signal or data, be converted to the signal form that can be used to communicate, transmit and store Coding.So as to detect the speed of mechanical movement, position, angle, distance or counting.In addition to being used in machinery, many motors Control such as servo motor is both needed to be equipped with encoder so that motor controller is as commutation.Photoelectric encoder is will by opto-electronic conversion Geometric displacement amount on output shaft is converted to the sensor of pulse or digital quantity.This is to apply most sensors, photoelectricity at present Encoder is made up of grating disc and photoelectric detection system.Grating disc is coaxial with motor, when motor rotates, grating disc and electricity Motivation rotates at the same speed, and the detection means formed through electronic components such as light emitting diodes detects some pulse signals, passes through calculating The number of photoelectric encoder output pulse per second can just reflect the rotating speed of current motor.

In recent years, photoelectric encoder is as a kind of high-precision angle measurement, tachogenerator, in electro-optic theodolite, numerical control The automatic measurements such as lathe, industry, bioscience and control field extensive use.Photoelectric encoder is in modern electrical machine control system In be usually used in detect rotor Position And Velocity, be that the geometry of machinery displacement on output shaft is converted into by arteries and veins by opto-electronic conversion Punching or the high precision angle measurement sensor of digital quantity.Use to encoder at present is mostly that encoder data is directly defeated People's computer is handled, display.Although this method implements simply, application is relatively cumbersome, at any time It is required for transferring data to computer, adds extra cost, transplanting is also more difficult.

As the development of research department's small lot war production is, it is necessary to the external coordination device such as volume procurement encoder.For convenience of inspection The encoder of buying is tested, ensures being timely completed for production task, the real-time reading circuit plate of one encoder of design is necessary. Encoder is needed to read in real time on the platform of angle value in addition, it can also be arranged on.

The content of the invention

The present invention provides a kind of real-time reading circuit of encoder, and circuit structure is compact, small volume, working stability, adaptability It is good, operating efficiency is improved, it is low in energy consumption, and there is good anti-interference and reliability, it is defeated that stable angle value can be obtained Go out.

The technical solution adopted in the present invention is.

The real-time reading circuit of encoder is turned by voltage conversion circuit, the main string pattern configuration circuits of spartan6, differential signal Normal signal circuit, LCD1602 configuration circuits and serial communication configuration circuit composition.

The voltage conversion circuit uses the XC6SLX9 of the spartan6 series of Xilinx companies as controller, with 50 M crystal oscillator CRYSTAL provides clock signal for it.The FPGA of spartan6 series has batch should for what Xilinx companies newly released With the FPGA device of, least cost, using 45nm low-power consumption process for copper, best balance is reached in cost, performance and power consumption. Because XC6SLX9-TQG144 needs to use 3.3 V and 1.2 V power supplies, with buck converter by 5V voltage conversions to required electricity Pressure, so having used LT1764EQ and LT1764EQ3.3 decompression chips.

In the main string pattern configuration circuits of spartan6, FPGA be based on SRAM techniques, so after power down, FPGA White tiles is reverted to, internal logic disappears, and this causes us the application of circuit board to be very limited.In order that FPGA can make repeatedly With, it is necessary to configure a chip external memory for FPGA with save routine, this circuit board employs XCF04S PROM with master String pattern configures to FPGA.

The incremental encoder that the differential signal turns the use of normal signal circuit is the CHOS systems of BEI-IDEACOD companies Row.Its output uses difference output mode, so having added DS26LV32ATM differential signal to turn letter by ordinary in circuit board Number chip, the signal after changing exports into 3.3 V, can be directly connected on FPGA pin, and wherein differential pair A+, A- are corresponding BM2_ DATAO, differential pair B+, B- correspond to BM2_DATAl, and differential pair Z+, Z- correspond to BM2_DATA2.

The A of incremental encoder used by the LCD1602 configuration circuits, B two-phases rotate a circle in encoder all can Export 8192 kinds of square-wave pulses；And absolute value encoder is all 13 data of output, so rotate a circle also can be defeated for encoder 8192 kinds of states, therefore used encoder corresponds to 8192 kinds of states in rotating a circle.Decimal point is counted in, plus ten Position, hundred, so angle value at most accounts for 14, so the LCD MODULE that the character of a line 16 is employed in circuit design is enough Meet that angle value shows needs.Conventional 1602 Liquid Crystal Modules for 3.3 V power supplies are used in circuit design.1602 Liquid Crystal Modules It has been internally integrated character and memory (CGROM), 160 different dot character figures of its storage inside occurs.Due to using 3.3 V power, and directly can be connected with FPGA.

The serial communication configuration circuit has added a serial port module, because the serial ports level value of PC is+12~12 V, And FPGA level is 0~+3.3 V.It must be carried out during hardware circuit design with electrical level transferring chip between both level Conversion.A MAX3232CSE conversion chip has been used on circuit board.

The beneficial effects of the invention are as follows：Circuit structure is compact, small volume, working stability, and adaptability is good, improves work effect Rate, it is low in energy consumption, and there is good anti-interference and reliability, stable angle value output can be obtained.

Brief description of the drawings

The present invention is further described with reference to the accompanying drawings and examples.

Fig. 1 is the voltage conversion circuit of the present invention.

Fig. 2 is the main string pattern configuration circuits of spartan6 of the present invention.

The differential signal that Fig. 3 is the present invention turns normal signal circuit.

Fig. 4 is the LCD1602 configuration circuits of the present invention.

Fig. 5 is the serial communication configuration circuit of the present invention.

Embodiment

The invention will be further described with reference to the accompanying drawings and examples.

Such as Fig. 1, voltage conversion circuit, as controller, is used using the XC6SLX9 of the spartan6 series of Xilinx companies 50 M crystal oscillator CRYSTAL provides clock signal for it.The FPGA of spartan6 series is having batch of newly releasing of Xilinx companies Amount application, the FPGA device of least cost, using 45nm low-power consumption process for copper, reach best in cost, performance and power consumption Balance.Because XC6SLX9-TQG144 needs to use 3.3 V and 1.2 V power supplies, with buck converter by 5V voltage conversions extremely Required voltage, so having used LT1764EQ and LT1764EQ3.3 decompression chips.

Such as Fig. 2, in the main string pattern configuration circuits of spartan6, FPGA be based on SRAM techniques, so after power down, FPGA reverts to white tiles, and internal logic disappears, and this causes us the application of circuit board to be very limited.In order that FPGA can be anti- It is multiple to use, it is necessary to configure a chip external memory for FPGA with save routine, this circuit board employs XCF04S PROM FPGA is configured with main string pattern.

Such as Fig. 3, the incremental encoder that differential signal turns the use of normal signal circuit is the CHOS of BEI-IDEACOD companies Series.Its output uses difference output mode, so having added DS26LV32ATM differential signal to turn common in circuit board The chip of signal, the signal after changing are exported into 3.3 V, can be directly connected on FPGA pin, wherein differential pair A+, A- pairs BM2_ DATAO are answered, differential pair B+, B- correspond to BM2_DATAl, and differential pair Z+, Z- correspond to BM2_DATA2.

Such as Fig. 4, the A of incremental encoder, B two-phases rotate a circle all in encoder used by LCD1602 configuration circuits 8192 kinds of square-wave pulses can be exported；And absolute value encoder is all 13 data of output, so rotate a circle also can be defeated for encoder 8192 kinds of states, therefore used encoder corresponds to 8192 kinds of states in rotating a circle.Decimal point is counted in, plus ten Position, hundred, so angle value at most accounts for 14, so the LCD MODULE that the character of a line 16 is employed in circuit design is enough Meet that angle value shows needs.Conventional 1602 Liquid Crystal Modules for 3.3 V power supplies are used in circuit design.1602 Liquid Crystal Modules It has been internally integrated character and memory (CGROM), 160 different dot character figures of its storage inside occurs.Due to using 3.3 V power, and directly can be connected with FPGA.

Such as Fig. 5, serial communication configuration circuit has added a serial port module, because the serial ports level value of PC is+12~12 V, and FPGA level is 0~+3.3 V.It must be carried out during hardware circuit design with electrical level transferring chip between both level Conversion.A MAX3232CSE conversion chip has been used on circuit board.

Claims

1. a kind of real-time reading circuit of encoder, it is characterized in that：The real-time reading circuit of described encoder by voltage conversion circuit, The main string pattern configuration circuits of spartan6, differential signal turn normal signal circuit, LCD1602 configuration circuits and serial communication configuration Circuit forms.

2. the real-time reading circuit of a kind of encoder according to claim 1, it is characterized in that：The voltage conversion circuit uses The XC6SLX9 of the spartan6 series of Xilinx companies provides clock for it with 50M crystal oscillator CRYSTAL and believed as controller Number.

3. the real-time reading circuit of a kind of encoder according to claim 1, it is characterized in that：Described voltage conversion circuit Need to use 3.3 V and 1.2 V power supplies using XC6SLX9-TQG144, with buck converter by 5V voltage conversions to required electricity Pressure, so having used LT1764EQ and LT1764EQ3.3 decompression chips.

4. the real-time reading circuit of a kind of encoder according to claim 1, it is characterized in that：The main string moulds of described spartan6 The PROM that formula configuration circuit employs an XCF04S is configured with main string pattern to FPGA.

5. the real-time reading circuit of a kind of encoder according to claim 1, it is characterized in that：The differential signal turns letter by ordinary The incremental encoder that number circuit uses is the CHOS series of BEI-IDEACOD companies, and its output uses difference output mode.

6. the real-time reading circuit of a kind of encoder according to claim 1, it is characterized in that：The differential signal turns common DS26LV32ATM differential signal has been added to turn the chip of normal signal in signal circuit, the signal after changing is defeated into 3.3 V Go out, can be directly connected on FPGA pin, wherein differential pair A+, A- corresponds to BM2_ DATAO, and differential pair B+, B- correspond to BM2_ DATAl, differential pair Z+, Z- correspond to BM2_DATA2.

7. the real-time reading circuit of a kind of encoder according to claim 1, it is characterized in that：The LCD1602 configuration circuits The A of used incremental encoder, B two-phase rotate a circle in encoder can all export 8192 kinds of square-wave pulses.

8. the real-time reading circuit of a kind of encoder according to claim 1, it is characterized in that：The serial communication configuration circuit A serial port module is added, and the conversion between both level is carried out using electrical level transferring chip, one has been used on circuit board MAX3232CSE conversion chips.