CN205539030U - MW level double -fed is increment type encoder processing circuit for wind turbine generator system - Google Patents

Abstract

The utility model provides a MW level double -fed is increment type encoder processing circuit for wind turbine generator system comprises isolation power supply, input RCR filter circuit, optical coupling isolation circuit, optocoupler output end filter circuit, output signal level modulation circuit. The signal process RCR filtering of encoder output, the filtering interference signal through the opto -coupler, carries out input/output end electric isolation, through the level modulation circuit, makes 15V with the output signal level of encoder by 5V, and the level range of enlargeing effective output signal through the grounding measure, reaches an accurate measurement motor rotation number, realizes the purpose of converter to the effective reliable control of electric power generation process of generator.

Description

MW level double-fed fan motor unit incremental encoder signal processing circuit

Technical field

The present utility model relates to the signal processing circuit of a kind of MW level double-fed fan motor unit incremental encoder.

Background technology

In MW level double-fed fan motor unit current transformer, generally using incremental encoder to test the speed, composition speed closed loop is anti- Feedback.If can not pulse to encoder output process exactly, then speed closed loop certainly exists relatively long delay and bigger Error, it is impossible to controlled effect satisfactorily, system is difficult to stable, and part of generating units even damages converter system element, Unit can not normal power generation.

The encoder of MW level double-fed wind power generator group is the detecting element of speed, is used to measure the dress of generator speed Put.Encoder symmetry output square-wave signal A+, A-；B+,B-；Z+,Z-.A, B, Z tri-is connected, for band reference bit correction Position measurement；The Z phase pulse often transferred out is to represent zero reference position.Due to the biphase difference of A, B 90 degree, logical Cross and compare A phase in front or B phase front, to differentiate the forward and reverse of encoder, by the zero pulse of Z phase, it is thus achieved that The zero reference position of encoder.

The signal processing circuit of traditional incremental encoder, use 5V level, be positioned at converter cabinet, be vulnerable to reactor, The electromagnetic interference of the elements such as IGBT power model；It addition, the generating of electromotor long time running, the plug of encoder can loosen, Produce interference burr, cause transmission signal is inaccurate or the weakening and lose of effective impulse；Encoder is connected by spider to be sent out Rotor, rotor oscillation can cause encoder identification pulse to be forbidden；Collector ring of generator carbon brush, the degree of wear of grounding carbon brush The big axle of generator amature electrostatic potential over the ground can be affected within the specific limits, thus affect code-disc and measure the accuracy of rotating speed；Compile The power supply line of code device is connected with current transformer through the distance of about 80 meters with output signal line, has certain transfer impedance, The voltage landing of transfer impedance makes encoder supply voltage maintain reduced levels, and encoder output can be caused faint or interior Portion's circuit quits work, and causes tachometric survey inaccurate.For strong electromagnetic existing in above-mentioned prior art, ground connection not Reliably, encoder feeder ear voltage landing etc. cause the encoder output loss of effective impulse, generator speed are measured inaccurate Problem, a kind of novel incremental encoder signal processing circuit of research design, overcome problems of the prior art, allow Unit recovers normal power generation, is the most necessary.

Utility model content

The purpose of this utility model is the problem overcoming above-mentioned prior art to exist, and proposes at a kind of new incremental encoder signal Reason circuit, in order to solve MW level Wind turbines tachometric survey circuit tachometric survey error in complex electromagnetic environment relatively big, Fluctuation range is big and the problem such as the versatility of control circuit.

This utility model solves its technical problem and be the technical scheme is that

A kind of MW level double-fed fan motor unit incremental encoder signal processing circuit, it is characterised in that described incremental is compiled Code device signal processing circuit is by isolating power supply circuits, input RCR filter circuit, optical coupling isolation circuit, the filter of optocoupler outfan Wave circuit and output signal level modulation circuit composition.

The input of described input RCR filter circuit connects encoder, the output of described input RCR filter circuit End connects the input of optical coupling isolation circuit, and the outfan of optical coupling isolation circuit connects the input of optocoupler outfan filter circuit, The outfan of optocoupler outfan filter circuit connects the input of output signal level modulation circuit, output signal level modulation circuit Outfan connect current transformer.Isolation power supply circuits are that output signal level modulation circuit is powered.

Encoder is connected to the input RCR filter circuit of encoder signal processing circuit through signal input terminal X2, by defeated Entering to hold RCR filter circuit to filter unnecessary interference, the signal of input RCR filter circuit output is as optical coupling isolation circuit Input, optical coupling isolation circuit realize the isolation of encoder and subsequent conditioning circuit, the signal of optical coupling isolation circuit output is as optocoupler The input of outfan filter circuit, through the filtering of optocoupler outfan filter circuit, obtains clean effective signal, then by optocoupler The signal of outfan filter circuit output is as the input of output signal level modulation circuit, and output signal level modulation circuit will have Effect signal is amplified, and delivers to signal output terminal X1, signal output terminal X1 and connects current transformer so that encoder output After signal encoded device signal processing circuit, for current transformer.Isolation power supply circuits provide output signal level modulation circuit Required 15V powers, grounding be used for connecting power supply with casing ground.

Described input RCR filter circuit is made up of two equivalent chromatic circle resistances and a polarity free capacitor, two equivalent colors One end of loop resistance is connected respectively to signal input terminal X2, and the other end is connected with a pin of polarity free capacitor respectively, and By polarity free capacitor both end voltage signal as the input signal of optical coupling isolation circuit.

Described optical coupling isolation circuit is made up of high speed photo coupling, pull-up resistor, anti-reverse diode, electrochemical capacitor, decoupling capacitor. High speed photo coupling input is connected with anti-reverse diode, in parallel with decoupling capacitor by electrochemical capacitor, is connected to optocoupler energization pins, Optocoupler being powered stable, without interruption, by pull-up resistor, the signal output pin of optocoupler determines that output signal is Low level effective.

Described optocoupler outfan filter circuit is made up of polarity free capacitor, filters interference unnecessary after optocoupler transmits with humorous Ripple, obtains clean effective signal.

Described output signal level modulation circuit is by MOSFET driving chip, Chip-R, electrochemical capacitor, decoupling capacitor Composition.The signal that optocoupler outfan filter circuit exports is divided into two by MOSFET driving chip, forms Symmetrical complementation Signal, and the level magnitudes of the signal of optocoupler outfan filter circuit output is enlarged into 15V level by 5V, it is achieved signal Reliable conversion, the input of output signal level modulation circuit, the resistance of output have the effect turned back preventing transmitting signal；

Described isolation power supply circuits are made up of power module, electric fuse, Schottky diode, electrochemical capacitor, polarity free capacitor. Carried out the conversion of input and output voltage by power module, electrochemical capacitor stablize input and output voltage, polarity free capacitor filter electricity Source module carries out ripple produced by voltage transformation.

In described incremental encoder signal processing circuit, signal input terminal X2 connects encoder, code device signal process The pulse signal that circuit capturing and coding device sends, and this signal is filtered, level modulation, power input terminal X3 carry For a 24V power supply, signal output terminal X1 providing a 5V power supply, wherein 24V is through isolation power supply circuits conversion To 15V for level modulation circuit, 5V is that input optocoupler, encoder are powered use.Encoder is connected to through three corner steadies Generator's motor shaft, along with the change of generator speed, encoder sends corresponding pulse, and this pulse signal can be by encoder signal Process circuit filtering and modulate, the 5V level signal that encoder exports effectively and reliably being enlarged into 15V level signal, reaches To the purpose accurately, stably gathering generator speed.

Incremental encoder signal processing circuit involved by this utility model uses RCR to filter, light-coupled isolation, level modulation, Grounding measure, can reflect the change of generator speed, can isolate again external electromagnetic interference, capacity of resisting disturbance is strong very well. Selected element manipulation temperature is-40 DEG C～105 DEG C, the adverse circumstances at the scene of can resisting.This utility model is reliable by one Filtering, level modulation circuit are incorporated into generator speed measurement links, by reliable and effective Filtering Processing, amplify output signal Level magnitudes, effectively inhibits the impact of impulse disturbances burr, modularized processing in strong electromagnetic environment, it is simple to installs, this sets Count and have the strongest practicality on wind energy turbine set generator speed is measured.

Accompanying drawing explanation

Fig. 1 is the theory diagram of incremental encoder signal processing circuit；

Fig. 2 is the circuit theory diagrams of incremental encoder signal processing circuit.

Detailed description of the invention

This utility model is further illustrated below in conjunction with the drawings and specific embodiments.

As it is shown in figure 1, this utility model incremental encoder signal processing circuit by input RCR filter circuit, optocoupler every From circuit, optocoupler output filter circuit, output signal level modulation circuit and isolation power supply circuits composition.

The input of described input RCR filter circuit connects encoder, the output of described input RCR filter circuit End connects the input of optical coupling isolation circuit, and the outfan of optical coupling isolation circuit connects the input of optocoupler outfan filter circuit, The outfan of optocoupler outfan filter circuit connects the input of output signal level modulation circuit, output signal level modulation circuit Outfan connect current transformer.Isolation power supply circuits are that output signal level modulation circuit is powered.

Fig. 2 is the circuit theory of incremental encoder signal processing circuit.

As in figure 2 it is shown, described isolation power supply circuits include power module B1, electric fuse F1, the 17th electric capacity C17, 18 electric capacity C18, Schottky diode D2, the 19th electric capacity C19, the 20th electric capacity C20, the 21st electric capacity C21, 22nd electric capacity C22, the 23rd electric capacity C23, the 24th electric capacity C24, the 24th resistance R24, and luminous Diode (LED) 1.14th pin of described power module B1 is connected to the power input terminal X3 of 24V through electric fuse F1 The 2nd pin；Simultaneously the 1st pin of power module B1 be connected to the 1st of power input terminal X3 the, 3 pins, power supply inputs 1st pin of terminal X3 and the 3rd pin are connected；14th pin of power module B1 through the 17th in parallel electric capacity C17, 18th electric capacity C18, Schottky diode D2 are connected with the 1st pin of power module B1, and Schottky diode D2's is negative Pole is connected with the 14th pin of power module B1, the 1st pin phase of the positive pole of Schottky diode D2 and power module B1 Even；9th pin of power module B1 is 15V voltage output end, through the 19th electric capacity C19 in parallel, the 20th electric capacity C20, the 21st electric capacity C21, the 22nd electric capacity C22, the 23rd electric capacity C23, the 24th electric capacity C24 and electricity 8th pin of source module B1 is connected, and the 8th pin of power module B1 is connected to GND.The wherein C17 of the 17th electric capacity Positive pole, the positive pole of the 18th electric capacity C18 connect the 14th pin of power module B1, the negative pole of the 17th electric capacity C17, The negative pole of 18 electric capacity C18 connects the 1st pin of power module B1；The positive pole of the 19th electric capacity C19, the 20th electric capacity C20 Positive pole connect the 9th pin of power module B1, the negative pole of the 19th electric capacity C19, the negative pole of the 20th electric capacity C20 meet GND, A stable 15V power supply is provided to output signal level modulation circuit.9th pin of power module B1 is through luminescence Diode (LED) 1 is connected to the 8th pin GND of the 24th resistance R24, the 24th resistance R24 and power module B1 It is connected, the output of instruction 15V voltage.

The A phase of described input RCR filter circuit input by the 22nd resistance R22, the 23rd resistance R23, 28 electric capacity C28 compositions, one end of the 23rd resistance R23 is connected to the 8th pin of signal input terminal X2, and second The other end of 13 resistance R23 is connected to the 3rd pin of the 3rd optocoupler K6；One end of 22nd resistance R22 is connected to letter 9th pin of number input terminal X2, the other end of the 22nd resistance R22 is connected to the 2nd pin of the 3rd optocoupler K6； One end of 28th electric capacity C28 is connected to the 3rd pin of the 3rd optocoupler K6, and the other end of the 28th electric capacity C28 connects The 2nd pin to the 3rd optocoupler K6.Input RCR filter circuit B phase inputs by the 19th resistance R19, the 20th electricity Resistance R20 and the 25th electric capacity C25 composition.One end of 20th resistance R20 is connected to the 6th of signal input terminal X2 Pin, the other end of the 20th resistance R20 is connected to the 3rd pin of the second optocoupler K5；One end of 19th resistance R19 is even Being connected to the 7th pin of signal input terminal X2, what the other end of the 19th resistance R19 was connected to the second optocoupler K5 the 2nd draws Foot, one end of the 25th electric capacity C25 is connected to the 3rd pin of the second optocoupler K5, the other end of the 25th electric capacity C25 It is connected to the 2nd pin of the second optocoupler K5.The Z phase of input RCR filter circuit input by the 16th resistance R16, the tenth Seven resistance R17 and the 15th electric capacity C15 composition.One end of 17th resistance R17 is connected to the 4th of signal input terminal X2 Pin, the other end of the 17th resistance R17 is connected to the 3rd pin of the first optocoupler K4；One end of 16th resistance R16 is even Being connected to the 5th pin of signal input terminal X2, what the other end of the 16th resistance R16 was connected to the first optocoupler K4 the 2nd draws Foot；One end of 15th electric capacity C15 is connected to the 3rd pin of the first optocoupler K4, and the other end of the 15th electric capacity C15 connects The 2nd pin to the first optocoupler K4.Wherein the 22nd resistance R22, the 23rd resistance R23, the 19th resistance R19, 20th resistance R20, the 16th resistance R16, the 17th resistance R17 are chromatic circle resistance, the 28th electric capacity C28, second 15 electric capacity C25, the 15th electric capacity C15 are polarity free capacitors.

Described optical coupling isolation circuit uses optocoupler A4504, height in parallel between second and third pin of optocoupler K4, K5, K6 Speed diode D1, D3, D4 are protection optocoupler emitting stage, prevent optocoupler reverse breakdown.The positive pole of the first high speed diode D1 Connecing the 3rd pin of the first optocoupler K4, the negative pole of the first high speed diode D1 connects the 2nd pin of the first optocoupler K4；Three-hypers The positive pole of speed diode D3 connects the 3rd pin of the second optocoupler K5, and the negative pole of the 3rd high speed diode D3 meets the second optocoupler K5 The 2nd pin；The positive pole of the 4th high speed diode D4 meets the 3rd pin of the 3rd optocoupler K6, the 4th high speed diode D4 Negative pole connect the 2nd pin of the 3rd optocoupler K6.

3rd pin of the 3rd optocoupler K6 receives the A-of input RCR filter circuit A phase through the 23rd resistance R23 8th pin of input, i.e. signal input terminal X2；2nd pin of the 3rd optocoupler K6 is through the 22nd resistance R22 Receive the A+ input of input RCR filter circuit A phase, i.e. the 9th pin of signal input terminal X2；Second optocoupler 3rd pin of K5 receives the B-input of input RCR filter circuit B phase through the 20th resistance R20, i.e. signal is defeated Enter the 6th pin of terminal X2；2nd pin of the second optocoupler K5 receives input RCR filtering through the 19th resistance R19 7th pin of the B+ input of circuit B phase, i.e. signal input terminal X2；3rd pin of the first optocoupler K4 is through the tenth Seven resistance R17 receive the Z-input of input RCR filter circuit Z phase, i.e. the 4th pin of signal input terminal X2； 2nd pin of the first optocoupler K4 receives the Z+ input of input RCR filter circuit Z phase through the 16th resistance R16, 5th pin of i.e. signal input terminal X2；6th pin of the first optocoupler K4 connects through pull-up resistor the 15th resistance R15 To the 2nd pin and the 8th pin of signal output terminal X1 of signal input terminal X2, the second optocoupler K5 is through pull-up resistor 18th resistance R18 is connected to the 2nd pin of signal input terminal X2 and the 8th pin of signal output terminal X1, the 3rd light 6th pin of coupling K6 is connected to the 2nd pin and the signal of signal input terminal X2 through pull-up resistor the 21st resistance R21 8th pin of lead-out terminal X1, and respectively by polarity free capacitor the 9th electric capacity C9, the 16th electric capacity C16, the 30th electric capacity C30 forms decoupling, the 6th electric capacity C6, the 7th electric capacity C7, the 8th electric capacity C8 provide stable power-supplying.Wherein the 6th electric capacity The positive pole of C6 and the 8th pin of a termination first optocoupler K4 of the 9th electric capacity C9, the 6th electric capacity C6's and the 9th electric capacity C9 The equal ground connection of the other end；The positive pole of the 7th electric capacity C7 and the 8th pin of a termination second optocoupler K5 of the 16th electric capacity C16, The equal ground connection of the other end of the 7th electric capacity C7 and the 16th electric capacity C16；The positive pole of the 8th electric capacity C8 and the 30th electric capacity C30's 8th pin of one termination the 3rd optocoupler K6, the equal ground connection of the other end of the 8th electric capacity C8 and the 30th electric capacity C30.

In described optocoupler outfan filter circuit, the 6th pin of the first optocoupler K4, the 6th pin of the second optocoupler K5 and 6th pin of the 3rd optocoupler K6 respectively through polarity free capacitor the 14th electric capacity C14, the 26th electric capacity C26, the 20th Nine electric capacity C29 ground connection.

Described level modulation main circuit to be made up of high-speed MOSFET driver chip and peripheral components thereof.Wherein the first optocoupler 6th pin of K4 is connected to the 2nd pin of the 3rd MOSFET driving chip K3, Jing Guo through the 11st resistance R11 13 resistance R13 connect the 4th pin of the 3rd MOSFET driving chip K3, the 3rd MOSFET driving chip K3's 7th pin is connected to the 6th pin of signal output terminal X1 through the 12nd resistance R12, and the 3rd MOSFET drives core 5th pin of sheet K3 connects the 5th pin of signal output terminal X1 through the 14th resistance R14.The 6th of second optocoupler K5 Pin is connected to the 2nd pin of the 2nd MOSFET driving chip K2 through the 7th resistance R7, through the 9th resistance R9 even Being connected to the 4th pin of the 2nd MOSFET driving chip K2, the 7th pin of the 2nd MOSFET driving chip K2 passes through Resistance R8 connects the 4th pin of signal output terminal X1, and the 5th pin of the 2nd MOSFET driving chip K2 is through resistance R10 is connected to connect the 3rd pin of signal output terminal X1.6th pin of the 3rd optocoupler K6 connects through the first resistance R1 2nd pin of the oneth MOSFET driving chip K1, connects a MOSFET driving chip K1 through the 4th resistance R4 The 4th pin, the 7th pin of a MOSFET driving chip K1 meets the of signal output terminal X1 through resistance R2 2 pins, the 5th pin of a MOSFET driving chip K1 the 1st draws through what resistance R5 met signal output terminal X1 Foot, wherein the 6th pin of a MOSFET driving chip K1 is connected to positive pole and the tenth electric capacity C10 of the first electric capacity C1 One end, the negative pole of the first electric capacity C1 and the other end ground connection of the tenth electric capacity C10, the 2nd MOSFET driving chip K2's 6th pin is connected to positive pole and one end of the 11st electric capacity C11 of the 3rd electric capacity C3, the negative pole and the tenth of the 3rd electric capacity C3 The other end ground connection of one electric capacity C11, the 6th pin of the 3rd MOSFET driving chip K3 is connected to the 13rd electric capacity C13 Positive pole and one end of the 12nd electric capacity C12, the negative pole of the 13rd electric capacity C13 and the other end ground connection of the 12nd electric capacity C12. The positive pole of the first electric capacity C1, the positive pole of the 3rd electric capacity C3, the positive pole of the 13rd electric capacity C13 are connected to the of power module B1 9 pins.Electric capacity C10, C11, C12 not polarity, to reach the purpose of stable power-supplying, decoupling.

The 0V of power input terminal X3 is connected with casing PE through the 3rd resistance R3, the second electric capacity C2 in parallel, and signal is defeated The GND entering terminal X2, X1 is connected with casing PE through the 6th resistance R6, the 4th electric capacity C4 in parallel；Second electric capacity C2 and the Y1 electric capacity that the 4th electric capacity C4 is JN472M；5V powers through second pin of signal input terminal X2 and signal 8th pin of lead-out terminal X1, on circuit boards through low impedance at high frequency electrochemical capacitor the 5th electric capacity C5 and the 27th electricity Hold C27 in parallel, reach the purpose of stable power-supplying.

In isolation power supply circuits described in the utility model, power module B1 uses the B2415D2W of gold yang invigorating, is a isolation 24V turn the DC-DC power module of 15V.The high common mode of the high speed that optocoupler is AVAGO company that optical coupling isolation circuit uses The chip that IPM interface special optocoupler A4504, the 5V level modulation of ratio uses to 15V level is IXDF602SI, at ground connection The Y1 electric capacity that electric capacity is JN472M that reason uses, electrochemical capacitor all uses ruby YXF series of high-frequency Low ESR electrochemical capacitor.

Traditional incremental encoder signal processing circuit is connected to encoder, encoder output level signal by longer transmission line Amplitude is little, and longer transmission line is in strong electromagnetic interference environment, and that can cause that signal transmits is inaccurate.This utility model conduct One independent equipment, effectively and reliably processes encoder output, it is achieved signal parallel exports, and tests the speed stable Accurately.

Isolation power supply circuits are made up of power module and the peripheral components thereof of a DC-DC, needed for producing level modulation circuit 15V supply voltage.

The determination of RCR filter circuit parameter.The LEINE LINDE heavy duty incremental encoder that MW level double-fed generator is conventional (model 862) is 2500 lines.This encoder is that 5V powers, and Transistor-Transistor Logic level exports, 2500ppr, maximum operating frequency 200KHZ, The rotating speed range of operation of the common double-fed generator of known band brush and slip ring is 0.7～1.3 times of rated speed, at specified turn Speed 1800r/min, code-disc pulse frequency is 1800 × 2500 lines/60s=75KHZ；Generator operation when 1.3 times of rated speed, Code-disc pulse frequency is 1800 × 1.3 × 2500 lines/60s=97.5KHZ.Through analysis of experiments, RCR filter circuit cut-off frequency is too Little or close to electromotor high workload rotating speed can cause again useful signal lose or decay, therefore input RCR wave filter is cut Only frequency configuration is encoder maximum operating frequency 200KHZ, and in circuit, actual parameter is that two resistances are respectively 100 Ω, Polarity free capacitor capacitance 3.9nF, cut-off frequency 204.15KHZ.

Through isolation optocoupler output signal A, B, Z after capacitor filtering, through the input pickup resistance of level modulation circuit Input IXDF602SI, thus exports the signal of positive and negative strictly complementary, it is therefore prevented that due to interference or transmission line is longer or encoder goes out The one-channel signal that line end loose contact causes has the situation of time delay or dislocation to occur, and output signal can be followed the tracks of timely and accurately The change of encoder output.

In grounding, the effect of JN472M Y1 electric capacity is to prevent voltage jump, absorbs the overvoltage of kurtosis, parallel connection The electric energy of resistance absorption electric capacity；

External connection terminals includes 13 terminal X3 and 29 green straight cutting binding post X2 and X1, terminal X2 For signal input terminal, connect encoder；Terminal X1 is signal output terminal, it is provided that encoder 5V power and export A, B, Z tri-road pulse signal；X3 is the power input terminal of 1 24V, powers to level modulation circuit.

The design of this utility model incremental encoder signal processing circuit comprehensively, the most accurately considers the amplification of useful signal, the most right Interference signal is effectively filtered out, and is isolated outside strong electromagnetic, has good grounding measure, anti- Interference performance is strong.The actual application needs that complex industrial is on-the-spot can be well adapted for.

Claims (7)

1. a MW level double-fed fan motor unit incremental encoder signal processing circuit, it is characterised in that: described increment Type encoder signal processing circuit is by isolating power supply circuits, input RCR filter circuit, optical coupling isolation circuit, optocoupler output End filter circuit and output signal level modulation circuit composition；The input of described input RCR filter circuit connects coding Device, the outfan of described input RCR filter circuit connects the input of optical coupling isolation circuit, optical coupling isolation circuit defeated Going out end and connect the input of optocoupler outfan filter circuit, the outfan of optocoupler outfan filter circuit connects output signal level and adjusts The input of circuit processed, the outfan of output signal level modulation circuit connects current transformer；Isolation power supply circuits are output signal electricity Flat modulation circuit is powered.

2. according to the MW level double-fed fan motor unit incremental encoder signal processing circuit described in claim 1, its feature It is: the 14th pin of the described power module B1 in isolation power supply circuits is connected to power input terminal through electric fuse F1 2nd pin of X3；Simultaneously the 1st pin of power module B1 be connected to the 1st of power input terminal X3 the, 3 pins, power supply 1st pin of input terminal X3 and the 3rd pin are connected；14th pin of power module B1 is through the 17th electric capacity in parallel C17, the 18th electric capacity C18, Schottky diode D2 are connected with the 1st pin of power module B1, Schottky diode The negative pole of D2 is connected with the 14th pin of power module B1, and positive pole is connected with the 1st pin of power module B1；Power supply mould 9th pin of block B1 is 15V voltage output end, through the 19th in parallel electric capacity C19, the 20th electric capacity C20, second 11 electric capacity C21, the 22nd electric capacity C22, the 23rd electric capacity C23, the 24th electric capacity C24 and power module B1 The 8th pin be connected, the 8th pin of power module B1 is connected to GND；Wherein the positive pole of the C17 of the 17th electric capacity, The positive pole of 18 electric capacity C18 meets the 14th pin of power module B1, the negative pole of the 17th electric capacity C17, the 18th electric capacity C18 Negative pole connect the 1st pin of power module B1；The positive pole of the 19th electric capacity C19, the positive pole of the 20th electric capacity C20 connect power supply 9th pin of module B1, the negative pole of the 19th electric capacity C19, the negative pole of the 20th electric capacity C20 meet GND, thus give defeated Going out signal level modulation circuit and provide a stable 15V power supply, the 9th pin of power module B1 is through light-emitting diodes Pipe LED1 is connected to the 24th resistance R24, the 8th pin GND of the 24th resistance R24 with B1 and is connected, instruction The output of 15V voltage.

3. according to the MW level double-fed fan motor unit incremental encoder signal processing circuit described in claim 1, its feature Be: the A phase of described input RCR filter circuit input by the 22nd resistance R22, the 23rd resistance R23, 28th electric capacity C28 composition；One end of 23rd resistance R23 is connected to the 8th pin of signal input terminal X2, the The other end of 23 resistance R23 is connected to the 3rd pin of the 3rd optocoupler K6；One end of 22nd resistance R22 is connected to 9th pin of signal input terminal X2, the other end of the 22nd resistance R22 is connected to the 2nd pin of the 3rd optocoupler K6； One end of 28th electric capacity C28 is connected to the 3rd pin of the 3rd optocoupler K6, and the other end of the 28th electric capacity C28 connects The 2nd pin to the 3rd optocoupler K6；Input RCR filter circuit B phase inputs by the 19th resistance R19, the 20th electricity Resistance R20, the 25th electric capacity C25 composition；One end of 20th resistance R20 is connected to the of signal input terminal X2 terminal 6 pins, the other end of the 20th resistance R20 is connected to the 3rd pin of the second optocoupler K5；One end of 19th resistance R19 Being connected to the 7th pin of signal input terminal X2, the other end of the 19th resistance R19 is connected to the 2nd of the second optocoupler K5 Pin；One end of 25th electric capacity C25 is connected to the 3rd pin of the second optocoupler K5, another of the 25th electric capacity C25 End is connected to the 2nd pin of the second optocoupler K5；The Z phase of input RCR filter circuit input by the 16th resistance R16, 17 resistance R17, the 15th electric capacity C15 composition；One end of 17th resistance R17 is connected to the of signal input terminal X2 4 pins, the other end of the 17th resistance R17 is connected to the 3rd pin of the first optocoupler K4, one end of the 16th resistance R16 Being connected to the 5th pin of signal input terminal X2, the other end of the 16th resistance R16 is connected to the 2nd of the first optocoupler K4 Pin, one end of the 15th electric capacity C15 is connected to the 3rd pin of the first optocoupler K4, and the other end of the 15th electric capacity C15 is even It is connected to the 2nd pin of the first optocoupler K4.

4. according to the MW level double-fed fan motor unit incremental encoder signal processing circuit described in claim 1, its feature Being: in described optical coupling isolation circuit, the positive pole of the first high speed diode D1 connects the 3rd pin of the first optocoupler K4, the The negative pole of one high speed diode D1 connects the 2nd pin of the first optocoupler K4；The positive pole of the 3rd high speed diode D3 connects the second optocoupler 3rd pin of K5, the negative pole of the 3rd high speed diode D3 connects the 2nd pin of the second optocoupler K5；4th high speed diode The positive pole of D4 connects the 3rd pin of the 3rd optocoupler K6, and the negative pole of the 4th high speed diode D4 meets the 2nd of the 3rd optocoupler K6 and draws Foot；3rd pin of the 3rd optocoupler K6 receives the A-of input RCR filter circuit A phase through the 23rd resistance R23 8th pin of input, i.e. signal input terminal X2；2nd pin of the 3rd optocoupler K6 is through the 22nd resistance R22 Receive the A+ input of input RCR filter circuit A phase, i.e. the 9th pin of signal input terminal X2；Second optocoupler 3rd pin of K5 receives the B-input of input RCR filter circuit B phase through the 20th resistance R20, i.e. signal is defeated Enter the 6th pin of terminal X2；2nd pin of the second optocoupler K5 receives input RCR filtering through the 19th resistance R19 7th pin of the B+ input of circuit B phase, i.e. signal input terminal X2；3rd pin of the first optocoupler K4 is through the tenth Seven resistance R17 receive the Z-input of input RCR filter circuit Z phase, i.e. the 4th pin of signal input terminal X2； 2nd pin of the first optocoupler K4 receives the Z+ input of input RCR filter circuit Z phase through the 16th resistance R16, 5th pin of i.e. signal input terminal X2；6th pin of the first optocoupler K4 connects through pull-up resistor the 15th resistance R15 To the 2nd pin and the 8th pin of signal output terminal X1 of signal input terminal X2, the second optocoupler K5 is through pull-up resistor 18th resistance R18 is connected to the 2nd pin of signal input terminal X2 and the 8th pin of signal output terminal X1, the 3rd light 6th pin of coupling K6 is connected to the 2nd pin and the signal of signal input terminal X2 through pull-up resistor the 21st resistance R21 8th pin of lead-out terminal X1, the first optocoupler K4, the second optocoupler K5, the 5th pin of the 3rd optocoupler K6 are optocoupler The earth terminal of chip, the 8th pin is the power supply anode of opto-coupler chip, and it is defeated that power supply anode the 8th pin of opto-coupler chip connects signal Enter the 2nd pin of terminal X2 and the 8th pin of signal output terminal X1, and respectively by the 9th electric capacity C9, the 16th electric capacity C16, the 30th electric capacity C30 composition decoupling, provided stable supplied by the 6th electric capacity C6, the 7th electric capacity C7, the 8th electric capacity C8 Electricity；8th pin of the one termination first optocoupler K4 of the positive pole of the 6th electric capacity C6 and the 9th electric capacity C9, the 6th electric capacity C6 with The equal ground connection of the other end of the 9th electric capacity C9；The positive pole of the 7th electric capacity C7 and a termination second optocoupler K5 of the 16th electric capacity C16 The 8th pin, the equal ground connection of the other end of the 7th electric capacity C7 and the 16th electric capacity C16；The positive pole and the 3rd of the 8th electric capacity C8 8th pin of one termination the 3rd optocoupler K6 of ten electric capacity C30, the other end of the 8th electric capacity C8 and the 30th electric capacity C30 is equal Ground connection.

5. according to the MW level double-fed fan motor unit incremental encoder signal processing circuit described in claim 1, its feature Be: in described optocoupler outfan filter circuit, the 6th pin of the first optocoupler K4, the 6th pin of the second optocoupler K5, With the 6th pin of the 3rd optocoupler K6 respectively through polarity free capacitor the 14th electric capacity C14, the 26th electric capacity C26, second 19 electric capacity C29 ground connection.

6. according to the MW level double-fed fan motor unit incremental encoder signal processing circuit described in claim 1, its feature It is: described level modulation main circuit to be made up of high-speed MOSFET driver chip and peripheral components thereof；Wherein the first light 6th pin of coupling K4 inputs the 2nd pin of the 3rd MOSFET driving chip K3, Jing Guo through the 11st resistance R11 13 resistance R13 connect the 4th pin of the 3rd MOSFET driving chip K3, the 3rd MOSFET driving chip K3's 7th pin is connected to the 6th pin of signal output terminal X1 through the 12nd resistance R12, and the 3rd MOSFET drives core 5th pin of sheet K3 connects the 5th pin of signal output terminal X1 through the 14th resistance R14；The 6th of second optocoupler K5 Pin inputs the 2nd pin of the 2nd MOSFET driving chip K2 through the 7th resistance R7, connects through the 9th resistance R9 To the 4th pin of the 2nd MOSFET driving chip K2, the 7th pin of the 2nd MOSFET driving chip K2 is through electricity Resistance R8 connects the 4th pin of signal output terminal X1, and the 5th pin of the 2nd MOSFET driving chip K2 is through resistance R10 It is connected to connect the 3rd pin of signal output terminal X1；6th pin of the 3rd optocoupler K6 connects first through the first resistance R1 2nd pin of MOSFET driving chip K1, connects the of a MOSFET driving chip K1 through the 4th resistance R4 4 pins, the 7th pin of a MOSFET driving chip K1 the 2nd draws through what resistance R2 met signal output terminal X1 Foot, the 5th pin of a MOSFET driving chip K1 connects the 1st pin of signal output terminal X1 through resistance R5； Wherein the 6th pin of a MOSFET driving chip K1 connects positive pole and one end of the tenth electric capacity C10 of the first electric capacity C1, The negative pole of the first electric capacity C1 and the other end ground connection of the tenth electric capacity C10, the 6th pin of the 2nd MOSFET driving chip K2 Connect positive pole and one end of the 11st electric capacity C11 of the 3rd electric capacity C3, the negative pole of the 3rd electric capacity C3 and the 11st electric capacity C11 Other end ground connection, the 3rd MOSFET driving chip K3 the 6th pin connect the 13rd electric capacity C13 positive pole and the tenth One end of two electric capacity C12, the negative pole of the 13rd electric capacity C13 and the other end ground connection of the 12nd electric capacity C12；First electric capacity C1 Positive pole, the positive pole of the 3rd electric capacity C3, the 13rd electric capacity C13 positive pole connect power module B1 the 9th pin.

7. according to the MW level double-fed fan motor unit incremental encoder signal processing described in Claims 2 or 3 or 4 or 6 Circuit, it is characterised in that: the 0V of power input terminal X3 is through the 3rd resistance R3 in parallel, the second electric capacity C2 and casing PE is connected, and signal input terminal X2, the GND of signal output terminal X1 pass through the 6th resistance R6 of parallel connection, the 4th electric capacity C4 is connected with casing PE；Second electric capacity C2 and the Y1 electric capacity that the 4th electric capacity C4 is JN472M；5V powers through signal Second pin of input terminal X2 and the 8th pin of signal output terminal X1, be electrolysed through low impedance at high frequency on circuit boards Electric capacity the 5th electric capacity C5 and the 27th electric capacity C27 is in parallel.