CN102230809B - Grating ruler hybrid conversion device - Google Patents
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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 scale conversion equipment, particularly relate to a kind of grating ruler hybrid conversion device.
Background technology
Grating scale has a very wide range of applications in the precision engineering such as various exact instrument of modern times, accurate little processing, high-precision numerical control machine field.Generally, grating scale is divided into increment type grating scale and absolute grating scale.The increment number that obtains by calculating from certain some beginning of increment type grating scale positional information obtains.Increment type grating scale 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 the data of surveying will be lost.In addition, after system boot, the increment type grating scale must be sought reference point or initial point by scanning, and this point is unallowed in the irremovable situation of moving component after again starting shooting.Absolute grating scale utilizes code channel specific coding technical notes absolute location information on grating scale, the coded message that only need read on grating scale after system powers on can the location aware value.This grating scale is reliable but manufacturing cost is high, and 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, in subsequent conditioning circuit constitution realization represent the coding of positional information.The method is for the circle grating, and after outage, coded message is lost and fails to realize that absolute grating truly measures.200610077378.7 of the patent No.s disclose another kind of grating scale implementation method.The method diverse location on grating scale 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 the absolute grating metering.The 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 the method has error, and be also unallowed in the irremovable situation of moving component after again starting shooting.
Summary of the invention
For the existing deficiency that realizes that the absolute grating metering exists, the present invention proposes a kind of grating ruler hybrid conversion device, can be used for converting easily common increment type grating scale to absolute grating scale, solved can not count after the outage that exists in the background technology, the absolute displacement value can not preserve, before and after solution powers on, because the mobile read head of needs obtains the absolute displacement value error that positional information causes, the while cost is low and system is reliable.
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 respectively three input ends of CPLD circuit with three output terminals A of zero balancing circuit, B, R, connect respectively first interface 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 the second interface, and the 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 the 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 input and the 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 is connected, resistance R 8 other ends and triode Q1 base stage, and the negative electrode of three end adjustable shunt reference voltage source TL431 is connected, three end adjustable shunt reference voltage source TL431 reference edges are connected with triode Q1 emitter and resistance R 9, three end adjustable shunt reference voltage source TL431 anodes are connected with resistance R 9 other ends and export as constant-current circuit, this output connects the A utmost point of schottky diode D3, 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) this grating ruler hybrid conversion device can reach the absolute grating scale effect by common increment type grating scale; Still can move the moving component that causes due to reasons such as inertia or shake after 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) this grating ruler hybrid conversion device can conveniently be exported absolute displacement and relative displacement value; Parameter used is calculated in displacement, and the section of comprising error coefficient and relative displacement reference point all can arrange easily by network interface.
3) shift value of this grating ruler hybrid conversion device may be output to network.The user can form a Sampling network with the custom system that is connected with described conversion equipment easily.
Description of drawings
Fig. 1 is grating ruler hybrid conversion device of the present invention and increment type grating scale connection diagram;
In Fig. 1: 1. stationary parts; 2. increment type grating scale scale; 3. increment type grating dynamic device; 4. pairing jointing; 5. grating ruler hybrid conversion device; 6. moving component.
Fig. 2 is grating ruler hybrid conversion device circuit diagram of the present invention.
Fig. 3 is CPLD internal module schematic 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 scale scale 2 is arranged on custom system stationary parts 1, and increment type grating dynamic device 3 is arranged on moving component 6, and increment type grating dynamic device 3 is connected with grating ruler hybrid conversion device 5 through pairing jointing 4.Grating ruler hybrid conversion device 5 receives the two-way phase differential of increment type grating dynamic device 3 outputs
Signal (A1 in Fig. 2, B1 signal) and one tunnel reference signal (R1 signal in Fig. 2), simultaneously grating ruler hybrid conversion device 5 also provides+the 5V power supply to the increment type grating scale.5 signals that can receive of grating ruler hybrid conversion device can be pulse digital signals, can be also the sine and cosine simulating signals.
As shown in Figure 2, grating ruler hybrid conversion device 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 respectively three input ends of CPLD circuit U 2 with three output terminals A of zero balancing circuit LM139 U4, B, R, meet respectively first interface J1 with zero balancing circuit LM139 U4 three input end A1, B1, R1, 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 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 is connected, resistance R 8 other ends and triode Q1 base stage, and the negative electrode of three end adjustable shunt reference voltage source TL431 D4 is connected, three end adjustable shunt reference voltage source TL431 reference edges are connected with triode Q1 emitter and resistance R 9, three end adjustable shunt reference voltage source TL431 anodes are connected with resistance R 9 other ends and export as constant-current circuit, this output connects the A utmost point of schottky diode D3, 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 first interface J1.This device with input signal and zero level relatively, signal A1 exports constantly if B1 and R1 are pulse digital signals, the sine and cosine simulating signal is exported after 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.At this device inside, above-mentioned three signals are carried out the conversion of absolute displacement.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 shaping, the B section of inputing to inside counting module.This module is sentenced take its 1/4 cycle as least unit to and counts A, B pulse digital signal take the absolute starting point of increment type grating scale as zero point.Input to grand moving shift value module after the available error coefficient of the section inside counting result section of carrying out error correction.The section error coefficient is for revising the grating scale error brought due to variable factors such as temperature, installations herein.The input of multistage laminating module is the R signal, and this signal is the reference signal that grating scale 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 shaping, B also inputs to 1/4 cycle inside counting module simultaneously.The pulse digital signal A of this module to 1/4 cycle of less than, B carry out micrometric displacement and detect.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 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 that another road arrives 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 obtained last 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 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 corresponding displacement constant;
Be
The section inside counting result of section take 1/4 cycle of signal as unit,
Be
The section direction coefficient, by sentencing to getting,
Be
The section error coefficient,
Be corresponding displacement equivalent of 1/4 cycle of signal;
Be direction coefficient, by sentencing to getting;
For with the count results of high frequency clock (design frequency is 100Mhz) to less than 1/4 periodic signal herein,
, wherein
For high frequency clock to the signal maximum count result in last complete 1/4 cycle.
Absolute displacement value one tunnel inputs to relative displacement value module, and the parameter of this module in the starting point parameter module converts the absolute displacement value to the relative displacement value as zero point 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 in Fig. 2) to; Simultaneously, this conversion equipment also can receive from network the parameters that the user sends by the I2C interface module, can set, change starting point parameter in conversion equipment and section error coefficient.
The Save and restore of absolute displacement value is undertaken by the UFM control module.This module detects the Dec signal in real time, when the Dec signal being detected and become low level from high 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 high level at the Reset signal, when being also system's power-up initializing, taking out and reaches absolute displacement value module and carry out the recovery of absolute displacement value being kept at absolute displacement value in the UFM 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 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 first interface J1, is that the increment type grating scale 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, 2F through resistance R 7 connections) positive pole, the farad capacitor minus earth, this circuit charges to farad capacitor, charges to approximately+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 connected by resistance R 8, triode Q1 collector, resistance R 8 other ends and triode Q1 base stage, and the negative electrode of three end adjustable shunt reference voltage source TL431 D4 is connected, the TL431 reference edge is connected with triode Q1 emitter and resistance R 9, the TL431 anode is connected 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 discharged (being designed to current limliting 100mA herein) by constant-current circuit, through schottky diode SS14 D2, SPX1117M3/3.3 U3 and increment type grating scale (through first interface J1) was powered.In addition, due to the existence of diode 1N4001 D1 and schottky diode SS14 D2, can through the second interface J2 to the power supply of device external equipment, not avoid the unnecessary loss of farad capacitor electric energy.In the time of the conversion equipment outage, will make Dec signal (EPM240T100C8 pin 5) become low level from high level, this level variation will trigger the UFM control module and delays time and the absolute displacement value is saved to the UFM module.When farad capacitor voltage be down to from+5.5V+this process of 5.2V, increment type grating scale (through first interface J1) and SPX1117M3/3.3 U3 supply voltage from+5V be down to+the 4.7V(farad capacitor is through the about 0.5V of the pressure drop of constant-current discharge circuit and schottky diode SS14), this moment, conversion equipment and increment type grating scale can work still that (increment type grating scale normal power supply scope is thought of as
).In the situation that current limliting 100mA, farad capacitor voltage from+5.5V be down to+this process of 5.2V will continue approximately 10s, this 10s can enough guarantee after outage due to the 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 time-delay, the absolute displacement value is saved to the UFM module.
Claims (1)
1. a grating ruler hybrid conversion device, 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), with three output terminals A of zero balancing circuit (U4), B, R connects respectively three input ends of CPLD circuit (U2), with three input end A1 of zero balancing circuit (U4), B1, R1 connects respectively first interface (J1), first interface (J1) is connected with pairing jointing (4), two output terminal SDA of CPLD circuit (U2), SCL connects the second interface (J2), the 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 from the outside by the second interface (J2), 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 input and the 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 is connected, resistance R 8 other ends and triode Q1 base stage, and three end adjustable shunt reference voltage source TL431(D4) negative electrode is connected, three end adjustable shunt reference voltage source TL431 reference edges are connected with triode Q1 emitter and resistance R 9, three end adjustable shunt reference voltage source TL431 anodes are connected with resistance R 9 other ends and export as constant-current circuit, this output connects the A utmost point of schottky diode D3, the K utmost point of schottky diode D3 connects the K utmost point of diode D1,
Increment type grating scale scale (2) is arranged on custom system stationary parts (1), increment type grating dynamic device (3) is arranged on moving component (6), and increment type grating dynamic device (3) is connected with grating ruler hybrid conversion device (5) through pairing jointing (4); The two-way phase differential of increment type grating dynamic device (3) output
Signal A1, B1 and one tunnel reference signal R1 by the pairing jointing (4) be introduced into conversion equipment (5), be connected to and zero balancing circuit LM139(U4 through first interface (J1)) input; With zero balancing circuit LM139(U4) input signal and zero level are compared, output signal is respectively A, and B and R input to low-power consumption CPLD EPM240T100C8 (U2); Inner at (U2) EPM240T100C8, with the pulse digital signal A after shaping, the B section of inputing to inside counting module; Section inside counting module is sentenced take its 1/4 cycle as least unit to and counts A, B pulse digital signal take the absolute starting point of increment type grating scale as zero point; Input to grand moving shift value module after the available error coefficient of the section inside counting result section of carrying out error correction; The multistage laminating module is counted the R signal section of carrying out, the section count results inputs to grand moving shift value module, grand moving shift value module is with the section count results with the stack of revised section inside counting result of error coefficient, and stack result be multiply by the displacement equivalent obtains grand moving shift value; Pulse digital signal A after shaping, B also inputs to 1/4 cycle inside counting module simultaneously; 1/4 cycle inside counting module is filled out step-by-step counting with high frequency clock to wherein one road signal pulse in 1/4 cycle of less than, and zero clearing is carried out in the signal pulse hopping edge that utilizes that another road arrives subsequently; The count results of 1/4 cycle inside counting module inputs to fine motion shift value module, and fine motion shift value module multiply by the displacement equivalent with count results and obtains last fine motion shift value; Grand moving shift value and fine motion shift value input to absolute displacement value module, and fine motion shift value module obtains final absolute displacement value with grand moving shift value and the addition of fine motion shift value; The Save and restore of absolute displacement value is undertaken by the UFM control module; The UFM control module detects the Dec signal in real time, in the time of the conversion equipment outage, to make the Dec signal become low level from high level, the level variation of Dec signal will trigger the UFM control module and delay time, guarantee after outage due to the inertia reason make moving component and increment type grating dynamic device still when minute movement or concussion conversion equipment still can correctly count, and after time-delay, the absolute displacement value is saved to the UFM module; The UFM control module is high level at the Reset signal, when being also system's power-up initializing, taking out and reaches absolute displacement value module and carry out the recovery of absolute displacement value being kept at absolute displacement value in the UFM module; Thereby reach the absolute grating scale effect.
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| CN103090780B (en) * | 2013-01-11 | 2015-12-02 | 山东科技大学 | A kind of mining drilling micro displacement meter |
| 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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| 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 |
| 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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| TWI403699B (en) * | 2008-08-26 | 2013-08-01 | Univ Nat Central | Absolute-type encoder and method for detecting absolute position |
| US7875844B2 (en) * | 2008-09-02 | 2011-01-25 | Delta Electronics, Inc. | Absolute-type encoder and method for detecting absolute position |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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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