CN102230809A - Grating ruler hybrid conversion device - Google Patents
Grating ruler hybrid conversion device Download PDFInfo
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- CN102230809A CN102230809A CN 201110176624 CN201110176624A CN102230809A CN 102230809 A CN102230809 A CN 102230809A CN 201110176624 CN201110176624 CN 201110176624 CN 201110176624 A CN201110176624 A CN 201110176624A CN 102230809 A CN102230809 A CN 102230809A
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Abstract
The invention discloses a grating ruler hybrid conversion device. The conversion device comprises a signal processing circuit and a power supply circuit. The signal processing circuit of the conversion device receives an output signal of a common incremental grating ruler and converts the signal into an absolute displacement which is stored and recovered by a nonvolatile storage in a complicated programmable logic device; the power supply circuit of the conversion device comprises a voltage-stabilizing circuit and a power-off protection circuit; and the power-off protection circuit mainly consists of a Farah capacitor charging circuit and a constant current circuit. The grating ruler hybrid conversion device can achieve the effect of an absolute grating ruler by the common incremental grating ruler; the actual absolute displacement of moving parts can be reliably reflected both before and after re-electrification without errors, and the cost is low. The absolute displacement value converted by the conversion device can be outputted to a network; and users can form a detection network by using user systems connected with the conversion device.
Description
Technical field
The present invention relates to a kind of grating chi conversion equipment, particularly relate to the hybrid conversion equipment of a kind of grating chi.
Background technology
The grating chi has a very wide range of applications in precision engineering fields such as various exact instrument of modern times, accurate little processing, high-precision numerical control machine.Generally, the grating chi is divided into increment type grating chi and absolute type grating chi.The increment number that obtains by calculating from certain some beginning of increment type grating chi positional information obtains.Increment type grating chi implementation method is simple, low cost of manufacture, but shortcoming is to meet accident or fault in testing process, typical case as outage midway, and then the data of surveying will be lost.In addition, increment type grating chi must be sought reference point or initial point by scanning behind the system boot, and this point is unallowed under the irremovable situation of back moving component of starting shooting again.Absolute type grating chi then utilizes code channel specific coding technical notes absolute location information on the grating chi, system powers on a back coded message that need read on the grating chi can the location aware value.Reliable but the manufacturing cost height of this grating chi, coding is complicated, and subsequent optical electric device resolution and precision are had higher requirement.
In recent years also relevant for the trial that realizes absolute grating.The patent No. 00112651.2 discloses a kind of round grating specific coding measurement Law, utilizes circle grating original signal, and structure has realized representing the coding of positional information in subsequent conditioning circuit.This method is at the circle grating, and outage back coded message is lost and failed to realize truly absolute grating measurement.200610077378.7 of the patent No.s disclose another kind of grating chi implementation method.This method diverse location on the grating chi is installed a plurality of radio-frequency cards, and read head is in moving process, and the positional information that receives each position radio-frequency card by radio-frequency card receiver mounted thereto realizes absolute grating measurement.This method is after system powers on, and radio-frequency card obtains positional information still to need a small amount of mobile read head to read nearby.So the resulting absolute displacement value of this method has error, and under the irremovable situation of back moving component of starting shooting again, also be unallowed.
Summary of the invention
At the existing deficiency that realizes that absolute grating measurement exists, the present invention proposes the hybrid conversion equipment of a kind of grating chi, can be used for converting common increment type grating chi to absolute type grating chi easily, solved can not count after the outage that exists in the background technology, the absolute displacement value can not preserve, owing to need mobile read head to obtain the absolute displacement value error that positional information causes, the while cost was low and system is reliable before and after solution powered on.
The present invention adopts following technical scheme:
The present invention includes signal processing circuit and feed circuit; Wherein:
Signal processing circuit: comprise and zero balancing circuit and CPLD circuit, connect three input ends of CPLD circuit respectively with three output terminals A of zero balancing circuit, B, R, connect first interface respectively with zero balancing circuit three input end A1, B1, R1, first interface is connected with the pairing jointing, two output terminal SDA, SCL of CPLD circuit connect second interface, and second interface connects user's subsequent process circuit;
Feed circuit: comprise mu balanced circuit, farad capacitor charging circuit and constant-current circuit are formed by connecting; It introduces power supply+6V by second interface from the outside, and the one road connects the A utmost point of diode D1, and another road connects the A utmost point of schottky diode D2; The K utmost point of diode D1 connects the input and first interface of 5v-3.3v mu balanced circuit; The output of mu balanced circuit is as the power supply of described conversion equipment; The K utmost point of schottky diode D2 draws capacitor C 8 positive poles through resistance R 7 connections, farad capacitor C8 minus earth, farad capacitor C8 positive pole connects the constant-current circuit input, this constant-current circuit input end is by resistance R 8, triode Q1 collector links to each other, resistance R 8 other ends and triode Q1 base stage, and the negative electrode of the adjustable shunting reference voltage source of three ends TL431 links to each other, three ends are adjustable, and shunting reference voltage source TL431 reference edge links to each other with triode Q1 emitter and resistance R 9, three ends are adjustable, and shunting reference voltage source TL431 anode links to each other with resistance R 9 other ends exports as constant-current circuit, this output connects the A utmost point of schottky diode D3, and the K utmost point of schottky diode D3 connects the K utmost point of diode D1.
The beneficial effect that the present invention has is:
1) the hybrid conversion equipment of this grating chi can reach absolute type grating chi effect by common increment type grating chi; Still can move the moving component that causes owing to reasons such as inertia or shake after the outage and count; All can accurately reflect the actual absolute displacement of moving component before and after re-powering, error free and cost is low.
2) the hybrid conversion equipment of this grating chi can conveniently be exported absolute displacement and relative displacement value; Used parameter is calculated in displacement, and the section of comprising error coefficient and relative displacement reference point all can be provided with easily by network interface.
3) shift value of the hybrid conversion equipment of this grating chi may be output to network.The user can form one with the custom system that is connected with described conversion equipment easily and detect network.
Description of drawings
Fig. 1 is hybrid conversion equipment of grating chi of the present invention and increment type grating chi connection diagram;
Among Fig. 1: 1. stationary parts; 2. increment type grating chi scale; 3. increment type grating dynamic device; 4. pairing jointing; 5. the hybrid conversion equipment of grating chi; 6. moving component.
Fig. 2 is the hybrid conversion equipment circuit diagram of grating chi of the present invention.
Fig. 3 is a CPLD internal module synoptic diagram of the present invention.
Embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
As shown in Figure 1, increment type grating chi scale 2 is installed on the custom system stationary parts 1, and increment type grating dynamic device 3 is installed on the moving component 6, and increment type grating dynamic device 3 links to each other with the hybrid conversion equipment 5 of grating chi through pairing jointing 4.The hybrid conversion equipment 5 of grating chi receives the two-way phase differential of increment type grating dynamic device 3 outputs
Signal (A1 among Fig. 2, B1 signal) and one tunnel reference signal (R1 signal among Fig. 2), simultaneously the hybrid conversion equipment 5 of grating chi also provides+the 5V power supply to increment type grating chi.5 signals that can receive of the hybrid conversion equipment of grating chi can be pulse digital signals, also can be the sine and cosine simulating signals.
As shown in Figure 2, the hybrid conversion equipment of grating chi of the present invention 5 it comprise signal processing circuit and feed circuit; Wherein:
Signal processing circuit: comprise and zero balancing circuit LM139 U4 and CPLD circuit U 2, connect three input ends of CPLD circuit U 2 respectively with three output terminals A of zero balancing circuit LM139 U4, B, R, meet the first interface J1 respectively with zero balancing circuit LM139 U4 three input end A1, B1, R1, the first interface J1 is connected with pairing jointing 4, two output terminal SDA, SCL of CPLD circuit U 2 meet the second interface J2, and the second interface J2 connects user's subsequent process circuit;
Feed circuit: comprise 5v-3.3v mu balanced circuit SPX1117M3/3.3 U3, farad capacitor charging circuit and constant-current circuit are formed by connecting; It introduces power supply+6V by the second interface J2 from the outside, and the one road connects the A utmost point of diode D1, and another road connects the A utmost point of schottky diode D2; The K utmost point of diode D1 meets the input and the first interface J1 of 5v-3.3v mu balanced circuit SPX1117M3/3.3 U3; 5v-3.3v the output of mu balanced circuit SPX1117M3/3.3 U3 is as the power supply of described conversion equipment; The K utmost point of schottky diode D2 draws capacitor C 8 positive poles through resistance R 7 connections, farad capacitor C8 minus earth, farad capacitor C8 positive pole connects the constant-current circuit input, this constant-current circuit input end is by resistance R 8, triode Q1 collector links to each other, resistance R 8 other ends and triode Q1 base stage, and the negative electrode of the adjustable shunting reference voltage source of three ends TL431 D4 links to each other, three ends are adjustable, and shunting reference voltage source TL431 reference edge links to each other with triode Q1 emitter and resistance R 9, three ends are adjustable, and shunting reference voltage source TL431 anode links to each other with resistance R 9 other ends exports as constant-current circuit, this output connects the A utmost point of schottky diode D3, and the K utmost point of schottky diode D3 connects the K utmost point of diode D1.
As shown in Figure 2, the two-way phase differential of increment type grating dynamic device 3 outputs
Signal A1, B1 and one tunnel reference signal R1 by the pairing jointing 4 be introduced into conversion equipment, be connected to the input of comparator circuit LM139 U4 through the first interface J1.This device with input signal and zero level relatively, signal A1 then exports constantly if B1 and R1 are pulse digital signals, the sine and cosine simulating signal is exported after then being converted to pulse digital signal in this way, output signal is respectively A, B and R.These three signals input to low-power consumption CPLD EPM240T100C8 U2.Above-mentioned three signals are carried out the conversion of absolute displacement at this device inside.CPLD is output as two-way and opens Lou output, i.e. SDA and SCL connect and export the second interface J2 to after drawing resistance.The clock of CPLD is by active crystal oscillator U5 input, and the clock design frequency is 100Mhz.The programming information of CPLD is downloaded input by JTAG mouth J3, and reset signal realizes by RC circuit and Schmidt trigger 74HC14 U1.
Inner concrete enforcement of this device (U2 EPM240T100C8) is: as shown in Figure 3.Pulse digital signal A after the shaping, the B section of inputing to inside counting module.This module with the absolute starting point of increment type grating chi be zero point to A, B pulse digital signal with its 1/4 cycle be least unit declare to and counting.Input to grand moving shift value module after the available error coefficient of the section inside counting result section of the carrying out error correction.The section error coefficient is to be used to revise because the grating chi error that variable factors such as temperature, installation are brought herein.The input of multistage laminating module is the R signal, and this signal is the reference signal that the grating chi sends every a fixed range.The multistage laminating module is to the R signal section of carrying out counting, and the section count results inputs to grand moving shift value module, and the R signal also carries out zero clearing (meaning when the end of previous complete segment and the beginning of next section) to section inside counting result simultaneously.Grand moving shift value module is with the section count results with revised section inside counting result of error coefficient (one section of less than) stack, and stack result be multiply by the displacement equivalent obtains grand moving shift value.Pulse digital signal A after the shaping, B also inputs to 1/4 cycle inside counting module simultaneously.This module is to the pulse digital signal A in 1/4 cycle of less than, and B carries out micrometric displacement and detects.Detection method is with high frequency clock (design frequency is 100Mhz) wherein one road signal pulse (as A) in this 1/4 cycle of less than to be filled out step-by-step counting herein, and zero clearing (meaning the end and the beginning in next 1/4 cycle when previous complete 1/4 cycle) is carried out in signal pulse (as the B) hopping edge that utilizes another road to arrive subsequently.This module count result inputs to fine motion shift value module, and the latter be multiply by the displacement equivalent with count results and got to the end fine motion shift value.Grand moving shift value and fine motion shift value input to absolute displacement value module, and the latter obtains final absolute displacement value with both additions.This absolute displacement value is expressed as follows formula:
In the formula:
Be the absolute displacement value,
Be grand moving shift value,
Be the fine motion shift value;
Be the section count results,
It is one section pairing displacement constant;
Be
Section is the section inside counting result of unit with 1/4 cycle of signal,
Be
The section direction coefficient, by declaring to getting,
Be
The section error coefficient,
Be pairing displacement equivalent of 1/4 cycle of signal;
Be direction coefficient, by declaring to getting;
For with the count results of high frequency clock (design frequency is 100Mhz) herein to less than 1/4 periodic signal,
, wherein
For high frequency clock to the signal maximum count result in last complete 1/4 cycle.
Absolute displacement is worth one the tunnel and inputs to relative displacement value module, and this module is zero point with the parameter in the starting point parameter module, converts the absolute displacement value to the relative displacement value by subtracting each other.Another road of absolute displacement value and relative displacement value input to the I2C interface module, and this module is pressed the I2C bus protocol by pin SDA with above-mentioned shift value, and SCL exports network (by the second interface J2 among Fig. 2) to; Simultaneously, this conversion equipment also can receive the parameter that is provided with that the user sends from network by the I2C interface module, can set, change a starting point parameter in the conversion equipment and a section error coefficient.
The preservation of absolute displacement value and recovery are undertaken by the UFM control module.This module detects the Dec signal in real time, when detecting the Dec signal when high level becomes low level, the UFM control module after time-delay a period of time (being designed to less than 10s) herein the absolute displacement value is saved to the UFM module.Wherein, the UFM module is the non-volatile Flash storer in the EPM240T100C8 sheet.The UFM control module is a high level at the Reset signal, when also being system's power-up initializing, carries out the recovery of absolute displacement value with being kept at the absolute displacement value taking-up in the UFM module and reaching absolute displacement value module.
The power supply mechanism of described conversion equipment as shown in Figure 2.Conversion equipment by the second interface J2 introduce power supply (+6Vp), one tunnel A utmost point that meets diode 1N4001 D1 wherein, the K utmost point of diode D1 is connected to the input and the first interface J1 of 5v-3.3v mu balanced circuit SPX1117M3/3.3 U3, SPX1117M3/3.3 reduces to 3.3V with voltage by the 5v-3.3v mu balanced circuit, with this as the conversion equipment internal supply voltage.Diode 1N4001 D1 output is that the K utmost point also is connected to the first interface J1, is that increment type grating chi is powered (approximately+5.3V) by this interface.Power supply (+6Vp) another road connects the A utmost point of schottky diode SS14 D2, and the K utmost point of schottky diode D2 draws capacitor C 8(5.5V through resistance R 7 connections, 2F) positive pole, the farad capacitor minus earth, this circuit charges to farad capacitor, charges to pact+5.5V.Resistance R 7 plays metering function in charging process.Farad capacitor C8 connects the input of constant-current circuit.This constant-current circuit input end is linked to each other by resistance R 8, triode Q1 collector, resistance R 8 other ends and triode Q1 base stage, and the negative electrode of the adjustable shunting reference voltage source of three ends TL431 D4 links to each other, the TL431 reference edge links to each other with triode Q1 emitter and resistance R 9, the TL431 anode links to each other with resistance R 9 other ends and exports as constant-current circuit, this output connects the A utmost point of schottky diode D3, and the K utmost point of schottky diode D3 connects the K utmost point of diode D1.When conversion equipment cut off the power supply, farad capacitor C8 powered to SPX1117M3/3.3 U3 and increment type grating chi (through the first interface J1) through schottky diode SS14 D2 by constant-current circuit discharge (being designed to current limliting 100mA herein).In addition, because the existence of diode 1N4001 D1 and schottky diode SS14 D2 can not avoided the unnecessary loss of farad capacitor electric energy through the second interface J2 to the power supply of device external equipment.In conversion equipment outage time, will make Dec signal (EPM240T100C8 pin 5) become low level from high level, and this level changes and will trigger the UFM control module and delay time and the absolute displacement value is saved to the UFM module.When farad capacitor voltage reduce to from+5.5V+this process of 5.2V, increment type grating chi (through the first interface J1) and SPX1117M3/3.3 U3 supply voltage from+5V reduce to+the 4.7V(farad capacitor is through the about 0.5V of pressure drop of constant-current discharge circuit and schottky diode SS14), this moment conversion equipment and increment type grating chi still can operate as normal (increment type grating chi normal power supply scope is thought of as
).Under the situation of current limliting 100mA, farad capacitor voltage from+5.5V reduce to+this process of 5.2V will continue about 10s, this 10s can enough guarantee after outage owing to reasons such as inertia make moving component and increment type grating dynamic device still when minute movement or concussion conversion equipment still can correctly count, and after the time-delay absolute displacement value is saved to the UFM module.
Claims (1)
1. the hybrid conversion equipment of grating chi is characterized in that: comprise signal processing circuit and feed circuit; Wherein:
Signal processing circuit: comprise and zero balancing circuit (U4) and CPLD circuit (U2), connect three input ends of CPLD circuit (U2) respectively with three output terminals A of zero balancing circuit (U4), B, R, connect first interface (J1) respectively with zero balancing circuit (U4) three input end A1, B1, R1, first interface (J1) is connected with pairing jointing (4), two output terminal SDA, SCL of CPLD circuit (U2) connect second interface (J2), and second interface (J2) connects user's subsequent process circuit;
Feed circuit: comprise mu balanced circuit (U3), farad capacitor charging circuit and constant-current circuit are formed by connecting; It introduces power supply+6V by second interface (J2) from the outside, the one road connects the A utmost point of diode D1, and another road connects the A utmost point of schottky diode D2; The K utmost point of diode D1 connects the input and first interface (J1) of 5v-3.3v mu balanced circuit (U3); The output of mu balanced circuit (U3) is as the power supply of described conversion equipment; The K utmost point of schottky diode D2 draws capacitor C 8 positive poles through resistance R 7 connections, farad capacitor C8 minus earth, farad capacitor C8 positive pole connects the constant-current circuit input, this constant-current circuit input end is by resistance R 8, triode Q1 collector links to each other, resistance R 8 other ends and triode Q1 base stage, and the adjustable shunting reference voltage source of three ends TL431(D4) negative electrode links to each other, three ends are adjustable, and shunting reference voltage source TL431 reference edge links to each other with triode Q1 emitter and resistance R 9, three ends are adjustable, and shunting reference voltage source TL431 anode links to each other with resistance R 9 other ends exports as constant-current circuit, this output connects the A utmost point of schottky diode D3, and the K utmost point of schottky diode D3 connects the K utmost point of diode D1.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103090780A (en) * | 2013-01-11 | 2013-05-08 | 山东科技大学 | Mine drilling micro displacement measurement instrument |
| CN103712559A (en) * | 2013-12-23 | 2014-04-09 | 北华航天工业学院 | Sealed grating scale scanner |
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| CN1307226A (en) * | 2000-01-25 | 2001-08-08 | 中国科学院光电技术研究所 | Circular grating absolute coding metering method |
| CN1858557A (en) * | 2006-02-13 | 2006-11-08 | 广州市诺信数字测控设备有限公司 | Grating ruler and its reading method |
| CN101206126A (en) * | 2007-11-26 | 2008-06-25 | 桂林市晶瑞传感技术有限公司 | Absoluteness type round grating sensor measuring apparatus for measuring absolute location |
| TW201009303A (en) * | 2008-08-26 | 2010-03-01 | Univ Nat Central | Absolute-type encoder and method for detecting absolute position |
| US20100051792A1 (en) * | 2008-09-02 | 2010-03-04 | Hong-Cheng Sheu | Absolute-type encoder and method for detecting absolute position |
| CN101782405A (en) * | 2010-01-26 | 2010-07-21 | 中国科学院光电技术研究所 | Hardware real-time verification method and system based on pseudo-random coding displacement sensor |
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2011
- 2011-06-28 CN CN 201110176624 patent/CN102230809B/en not_active Expired - Fee Related
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|---|---|---|---|---|
| CN1307226A (en) * | 2000-01-25 | 2001-08-08 | 中国科学院光电技术研究所 | Circular grating absolute coding metering method |
| CN1858557A (en) * | 2006-02-13 | 2006-11-08 | 广州市诺信数字测控设备有限公司 | Grating ruler and its reading method |
| CN101206126A (en) * | 2007-11-26 | 2008-06-25 | 桂林市晶瑞传感技术有限公司 | Absoluteness type round grating sensor measuring apparatus for measuring absolute location |
| TW201009303A (en) * | 2008-08-26 | 2010-03-01 | Univ Nat Central | Absolute-type encoder and method for detecting absolute position |
| US20100051792A1 (en) * | 2008-09-02 | 2010-03-04 | Hong-Cheng Sheu | Absolute-type encoder and method for detecting absolute position |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103090780A (en) * | 2013-01-11 | 2013-05-08 | 山东科技大学 | Mine drilling micro displacement measurement instrument |
| CN103712559A (en) * | 2013-12-23 | 2014-04-09 | 北华航天工业学院 | Sealed grating scale scanner |
| CN103712559B (en) * | 2013-12-23 | 2016-08-17 | 北华航天工业学院 | A kind of sealed grating scale scanner |
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