CN102490690B - Pulse width modulation window wiper control system of locomotive - Google Patents
Pulse width modulation window wiper control system of locomotive Download PDFInfo
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- CN102490690B CN102490690B CN201110421716.5A CN201110421716A CN102490690B CN 102490690 B CN102490690 B CN 102490690B CN 201110421716 A CN201110421716 A CN 201110421716A CN 102490690 B CN102490690 B CN 102490690B
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Abstract
The invention discloses a pulse width modulation window wiper control system of a locomotive, which comprises a direct-current power delay power-off switching circuit, a window wiper direct-current motor PWM (pulse width modulation) control driving circuit, a motor overcurrent protecting circuit, a window wiper direct-current stop braking circuit and a single-speed direct-current motor. A central control unit is connected with a running MOSFET (metal oxide semiconductor field effect transistor) by a PWM running high-frequency high-speed isolating circuit and a high-speed MOS (metal oxide semiconductor) driving circuit to control the single-speed window wiper motor to wipe and run at slow speed or high speed or intermittently. A brake output port of the central control unit is connected with a brake MOSFET by a brake isolating circuit and a brake bipolar MOS driving circuit to control the single-speed window wiper motor to dynamically brake and stop. The single-speed motor overcomes the shortcoming of quick abrasion of a slip ring carbon brush due to asymmetric torque of a double-speed motor, the PWM control driving circuit reduces a heating value and temperature rise of a direct-current motor driving circuit, service lives of the motor and the system are prolonged, and cost is lowered.
Description
Technical field
The present invention relates to the electronic technology field that locomotive windshield wiper is controlled, be particularly useful for the track traffics such as locomotive, city rail, subway and control with windshield wiper.
Background technology
Locomotive windshield wiper is divided into two types of Pneumatic window cleaner and electric window wipers.Locomotive electric window wiper has particularity: locomotive direct current 110V power supply (electric window wiper power supply) fluctuation serious (± 30%), electrical network impulse voltage is high, operation torque load(ing) is large, and locomotive frequently occurs two car intersections, enters the extraordinary circumstances such as the rapid increasing of the windshield wiper torque load(ing)s such as tunnel.
Electric window wiper has two kinds of control programs at present.One, Control double speed permanent magnet DC motor scheme: the problem such as shortcoming is relay contact arcing scaling loss, electromagnetic interference is serious, noise is large, motor service life is short, fault rate is high.Two, electronic power switch is controlled double speed permanent magnet DC motor scheme: shortcoming is that this method does not only fundamentally solve motor short problem in service life, and because design is unreasonable, electronic power switch usually damages.Double-speed motor causes the defect of slip ring carbon brush Fast Wearing because moment is asymmetric, service life is very short.Locomotive electric window wiper fault rate is up to 30-40%, and original locomotive windshield wiper becomes an obstacle that relates to safe driving, is therefore badly in need of the locomotive windshield wiper of a kind of reliable in quality, high stability.
Summary of the invention
The object of the invention is to, overcome that current electric window wiper cost is high, service life is short, control circuit is fragile, and the deficiency that fault rate is high provides a kind of simple in structure, and cost is low, stable performance, the window wiper control system of locomotive that reliability is high.
Technical scheme of the present invention is: a kind of window wiper control system of locomotive of pulse duration modulation; comprise direct supply delay electricity break switch circuit, windshield wiper DC machine PWM controls driving circuit, motor overcurrent protection circuit; windshield wiper DC machine stops braking circuit, single speed DC machine.
Described direct supply delay electricity break switch circuit (2) input end connects the overvoltage of locomotive 110V direct supply, surge protection circuit (1); mouth connection common mode signal suppresses circuit (3); control end connects the halt circuit of input control circuit (5), and common-mode signal suppression circuit (3) connects the anode of isolated from power change-over circuit (4) and rain shaving electrical machine (10).
Described windshield wiper DC machine PWM controls driving circuit, Central Processing Unit (CPU) (6) input scan port connects input control circuit (5), Central Processing Unit (CPU) (6) PWM output port connects PWM operation high-frequency high-speed buffer circuit (12) input end, PWM operation high-frequency high-speed buffer circuit (12) mouth connects high speed metal-oxide-semiconductor driving circuit (13) input end, high speed metal-oxide-semiconductor driving circuit (13) mouth connects operation MOSFET(14) grid, operation MOSFET(14) drain electrode connects single speed rain shaving electrical machine (10) negative terminal, source electrode connects motor current detecting circuit (15) and connects power cathode.
Described operation MOSFET(14) grid source electrode connects two-way pressure limited protection circuit, is a pair of stabilivolt differential concatenation; Operation MOSFET(14) the drain-source utmost point connects RC peak restrained and absorbing circuit.
Described high speed metal-oxide-semiconductor driving circuit (13) output termination current limliting repeating resistance and bleeder resistance, the current limliting repeating resistance other end connects operation MOSFET(14) grid, bleeder resistance other end ground connection.
Described motor overcurrent protection circuit; motor current detecting circuit (15) connects operation MOSFET(14) and over current of motor comparator circuit (16); over current of motor comparator circuit (16) mouth connects over-current detection buffer circuit (17) input end; over-current detection buffer circuit (17) mouth connects the over-current detection port of Central Processing Unit (CPU) (6); current detection circuit (15) is noninductive high-power precision resistance, and over current of motor comparator circuit (16) is comparator circuit.
Described windshield wiper DC machine stops braking circuit: Central Processing Unit (CPU) (6) PWM output port connects braking buffer circuit (7) input end, braking buffer circuit (7) mouth connects braking ambipolar metal-oxide-semiconductor driving circuit (8) input end, brake ambipolar metal-oxide-semiconductor driving circuit (8) mouth and connect braking MOSFET(9) grid, braking MOSFET(9) drain electrode connection common mode signal suppresses circuit (3) mouth, and source electrode connects rain shaving electrical machine (10) negative pole.
Described braking MOSFET(9) grid source electrode connects two-way pressure limited protection circuit, is a pair of stabilivolt differential concatenation, and the drain-source utmost point connects RC peak restrained and absorbing circuit, and rain shaving electrical machine (10) two ends connect afterflow protective circuit.
Described scraping arm position detecting circuit (18) detects the appointment stop position that arm mechanism (11) is scraped in DC machine (10) output, scraping arm position detecting circuit (18) connection location detects buffer circuit (19) input end, and position probing buffer circuit (19) mouth connects Central Processing Unit (CPU) (6) position probing port.
Described spray electric machine control driving circuit, Central Processing Unit (CPU) (6) PWM spray port connects spray buffer circuit (20) input end, spray buffer circuit (20) mouth connects ambipolar metal-oxide-semiconductor driving circuit (21), ambipolar metal-oxide-semiconductor driving circuit (21) connects spray MOSFET(22) grid, drain electrode connects spray motor (23) negative pole, and source electrode connects power cathode.
The window wiper control system of locomotive of described pulse duration modulation, by Central Processing Unit (CPU) (6) scanning input control circuit (5) at a slow speed, fast, intermittently or danger signal, by windshield wiper DC machine PWM, control driving circuit output pulse width modulation signal, control single speed direct current rain shaving electrical machine (10) drive scrape arm mechanism (11) to railway locomotive glass carry out at a slow speed, fast, intermittently wiper operation or stop.
Described windshield wiper DC machine stops braking circuit, by scraping arm position detecting circuit (18), detect and scrape arm mechanism (11) in specifying stop position, by position probing buffer circuit (11), export Central Processing Unit (CPU) (6) to, after Central Processing Unit (CPU) (6) is processed, stop, after the output of PWM run signal, by braking buffer circuit (7), braking ambipolar metal-oxide-semiconductor driving circuit (8), braking MOSFET(9) output speed-slackening signal, realizes rain shaving electrical machine resistance braking.
Described direct supply delay electricity break switch circuit (2) is realized, when input control circuit (5) input danger signal, after assurance is scraped arm mechanism (11) and can be got back to initial position and stop, direct supply delay electricity break switch circuit (2) just time delay disconnects wiper system power supply.After windshield wiper stops, system is except outside delay electricity break switch circuit (2), the complete power-off of other all circuit.
Described motor overcurrent protection circuit; by operation MOSFET(14) motor current detecting circuit (15) of series connection detects current of electric; over current of motor comparator circuit (16) exports Central Processing Unit (CPU) (6) to over-current detection buffer circuit (17); after the processing such as Central Processing Unit (CPU) digital filter; if there is over-current phenomenon avoidance in Intelligent Measurement in normal course of operation; stop at once windshield wiper rain shaving electrical machine (10) operation, and automatically stop.Motor current detecting circuit (15) is noninductive high-power resistance.Over current of motor comparator circuit (16) is operation amplifier circuit.
Described spray electric machine control driving circuit, spray motor (23), in discontinuous work, is pressed after input control circuit (5) spray button, and single spray time was greater than after 10 seconds, automatically stopped spray.Until press spray button next time.
Advantage of the present invention:
For windshield wiper double-speed motor, because moment is asymmetric, cause slip ring carbon brush Fast Wearing, the defect that service life is very short.The pulse duration modulation method of windshield wiper single speed DC machine is proposed, carry out windshield wiper at a slow speed, fast, intermittently, adjusting out of service, single speed DC machine windshield wiper control system is than double-speed motor windshield wiper control system life more than approximately 10 times.
Design control signal isolation change-over circuit, realizes controlling driving and motor power circuit actv. electrical isolation; Designed the two-way pressure limited protection circuit of grid source electrode of MOSFET; drain-source utmost point RC peak restrained and absorbing circuit; actv. has suppressed control driver module and power device MOSFET peak power; reduce cal val and the temperature rise of power device; and suppressed switching noise, extended control system circuit lifetime.
Designed direct supply delay electricity break switch circuit, after windshield wiper stops, time delay disconnects other window wiper system power supplys except time delay circuit.Reducing the charged work-hours of window wiper control system of locomotive is original 10-20%, extends control system and electrical machinery life 5-10 doubly.
Accompanying drawing explanation
Fig. 1 is the window wiper control system of locomotive block diagram of pulse duration modulation.
Fig. 2 is direct supply delay electricity break switch schematic circuit diagram.
Fig. 3 is that window wiper motor PWM controls driving and stops braking driving principle figure.
Fig. 4 is windshield wiper scraping arm stop position testing circuit.
Fig. 5 is window wiper motor over-current detection circuit.
Fig. 6 is spray electric machine control driving principle figure.
The specific embodiment
The present invention is further described as follows with example by reference to the accompanying drawings:
As shown in Fig. 1-6, a kind of window wiper control system of locomotive of pulse duration modulation, by Central Processing Unit (CPU) (6) scanning input control circuit (5) input at a slow speed, fast, intermittently or danger signal, by PWM, move high-frequency high-speed buffer circuit (12), high speed metal-oxide-semiconductor driving circuit (13), operation MOSFET(14), output pulse width modulation signal, control single speed rain shaving electrical machine (10) drive scrape arm mechanism (11) to railway locomotive glass carry out at a slow speed, fast, intermittently wiper operation or stop.
As shown in Figure 2, the direct supply delay electricity break switch circuit of the window wiper control system of locomotive of pulse duration modulation, connects with GND 0 by rotor switch, by the electric discharge of capacitor C 2, the time delayed turn-off of aerotron Q1, thereby the time delayed turn-off of control power circuit high power valve Q1.Delay time is adjustable by R3, R4, C2, design time delay approximately 10 seconds, and after guaranteeing that windshield wiper scraping arm is returned to assigned address and stops, all power-off of other circuit except delay electricity break switch circuit, reduce system current"on"time, extend system life.High-power PNP pipe Q1 is 2SA1943, maximum operating currenbt 15A.
As shown in Figure 3, Central Processing Unit (CPU) (6) scanning input control circuit (5) input at a slow speed, fast, after intermittency signal, Central Processing Unit (CPU) output pwm signal tremendously high frequency high-speed isolated chip G7, G7 output pwm signal drives chip U5 to high speed metal-oxide-semiconductor, driven MOS FET pipe Q8 work.MOSFET selects IRFP460, maximal work voltage 500V, and electric current 20A, RDS is less than 0.27 ohm.The two-way pressure limited protection circuit of MOSFET pipe Q8 grid source electrode, two-way pressure limited protection circuit is a pair of stabilivolt 1N4744 of D18, D19 differential concatenation, prevents that MOSFET grid source electrode high pressure from damaging.The Q8 drain-source utmost point connects peak restrained and the absorbing circuit that R41, C41 form, and suppresses the peak power of MOSFET.
For reducing MOSFET pipe Q8 traverse time cal val, high-frequency high-speed isolating chip G7, high speed metal-oxide-semiconductor drives the positive rise of chip U5, the traverse time of falling edge to be nanosecond rank.For guaranteeing the reliable fast conducting of MOSFET pipe Q8, high speed metal-oxide-semiconductor drives chip U5 to adopt 12V power supply, and power supply is taken from isolated from power change-over circuit 4.For guaranteeing MOSFET pipe Q8 fast conducting, it is 10 ohm that current limliting repeating resistance R39 selects smaller value.Grid discharge loop when Q8 bleeder resistance R40 ends as MOSFET pipe Q8, R40 resistance value can not be excessive, can affect the MOSFET turn-off time.
As shown in Figure 4, when window wiper motor stops braking, after the danger signal of Central Processing Unit (CPU) (6) scanning input control circuit (5) input, enter and stop braking mode.Central Processing Unit (CPU) (6) is by R44, and C43, isolates optocoupler G8, and the scraping arm reset position testing circuit that R47 forms detects scraping arm reset signal.R44 is power metal film resistance.When scraping arm being detected and move to reset position, stop the output of window wiper motor pwm control signal, Q8 cut-off, the inducing current of rain shaving electrical machine is released energy by sustained diode 16 afterflows.After extremely short time of time delay, Central Processing Unit (CPU) (6) output high level speed-slackening signal, by photoelectric coupling chip, G6 exports, and conducting NMOS drives aerotron Q6, last conducting braking MOSFET pipe Q7, rain shaving electrical machine fast dynamic braking.MOSFET pipe Q7 selects IRFP460, maximal work voltage 500V, and electric current 20A, RDS is less than 0.27 ohm.
Braking MOSFET pipe Q7 grid source electrode connects two-way pressure limited protection circuit, and two-way pressure limited protection circuit is a pair of stabilivolt 1N4744 of D13, D14 differential concatenation, prevents that MOSFET grid source electrode high pressure from damaging.The Q7 drain-source utmost point connects peak restrained and the absorbing circuit that R35, C38 form, and suppresses the peak power of MOSFET.For preventing that disturbing spike surprisingly to trigger drives aerotron Q6 conducting, optocoupler G6 two ends parallel filtering electric capacity.High-frequency diode D15, D17 guarantee Q7, Q8 one-way conduction.
Over-current detection circuit, by managing with operation MOSFET the noninductive power resistor R42 of high precision, the R43 that Q8 source series is connected, is converted into voltage signal motor operating current as shown in Figure 3.R42, R43 are the metallic membrane power resistor of precision 1%.
As shown in Figure 5, the voltage signal of the current of electric of detection conversion, the comparator forming by op amp U3 and reference voltage relatively after, by opto-coupler chip G3, export Central Processing Unit (CPU) (6) to and carry out over-current detection.The bleeder circuit that reference voltage is comprised of precision resistance R12, R13 provides.Filter capacitor C33 carries out hardware filtering, prevents that interfering signal false triggering from producing over-current signal.Central Processing Unit (CPU) (6) detects over-current signal, carries out software filtering, confirms after the certain overcurrent of motor, stops at once pwm signal output, and motor is out of service.
As shown in Figure 6, scanning input control circuit (5) outputs signal to Central Processing Unit (CPU) (6), and Central Processing Unit (CPU) (6) output low level spray signal, by photoelectric coupling G5, is controlled aerotron Q4 conducting, and driven MOS FET pipe Q5 drives spray machine operation.MOSFET pipe Q5 selects IRF740, maximal work voltage 400V, and electric current 10A, RDS is less than 0.55 ohm.Q5 grid source electrode connects pressure limited protection circuit, and pressure limited protection circuit is that D12 is 1N4744, prevents that MOSFET grid source electrode high pressure from damaging.The Q5 drain-source utmost point connects peak restrained and the absorbing circuit that R37, C29 form.Spray circuit is controlled as being interrupted work system by Central Processing Unit (CPU) (6), and single work-hours is less than 10 seconds, to protect spray motor not because long-play high temperature damages.
The present invention mainly adopts pulse width modulation mode to control rain shaving electrical machine to carry out low speed, at a high speed, intermittently and the mode of operation stopping.Main application high-frequency high-speed photoelectric coupled device, high speed metal-oxide-semiconductor driving circuit, peak absorbing technology, reduce field effect transistor dynamic response time, reduce peak power, greatly reduce DC machine driven MOS FET cal val and temperature rise, improve circuit drives electric current, extend field effect transistor service life.Direct supply delay electricity break switch circuit (2) time delay disconnects window wiper system power supply, provides time enough to make scraping arm can get back to initial position.After windshield wiper stops, system is except outside input time delay power-down circuit, the complete power-off of other all circuit.Native system has the input of wide power voltage, simple in structure, stable performance, the advantage that reliability is high.
It should be pointed out that for the present invention through absolutely proving to there is the embodiment of multiple conversion and modification, be not limited to the instantiation of above-mentioned embodiment.Above-mentioned example is as just explanation of the present invention, rather than restriction.In a word, which apparent conversion or alternative and remodeling is to those skilled in the art protection scope of the present invention comprise.
Claims (9)
1. the window wiper control system of locomotive of a pulse duration modulation, it is characterized in that: comprise direct supply delay electricity break switch circuit, windshield wiper single speed DC machine PWM controls driving circuit, windshield wiper single speed DC machine current foldback circuit, windshield wiper single speed DC machine stops braking circuit, spray electric machine control driving circuit, windshield wiper single speed DC machine, spray motor, Central Processing Unit (CPU) (6) input scan port connects input control circuit (5), Central Processing Unit (CPU) (6) PWM output port connects PWM operation high-frequency high-speed buffer circuit (12) input end, PWM operation high-frequency high-speed buffer circuit (12) mouth connects high speed metal-oxide-semiconductor driving circuit (13) input end, high speed metal-oxide-semiconductor driving circuit (13) mouth connects operation MOSFET(14) grid, operation MOSFET(14) drain electrode connects windshield wiper single speed DC machine (10) negative terminal, source electrode connects windshield wiper single speed DC motor current detection circuit (15) and connects power cathode.
2. the window wiper control system of locomotive of pulse duration modulation according to claim 1; it is characterized in that direct supply delay electricity break switch circuit (2) input end connects the overvoltage of locomotive 110V direct supply, surge protection circuit (1); mouth connection common mode signal suppresses circuit (3); control end connects the halt circuit of input control circuit (5), and common-mode signal suppression circuit (3) connects the anode of isolated from power change-over circuit (4) and windshield wiper single speed DC machine (10).
3. the window wiper control system of locomotive of pulse duration modulation according to claim 1, is characterized in that: operation MOSFET(14) grid source electrode connects two-way pressure limited protection circuit, is a pair of stabilivolt differential concatenation; Operation MOSFET(14) the drain-source utmost point connects RC peak restrained and absorbing circuit.
4. the window wiper control system of locomotive of pulse duration modulation according to claim 1, it is characterized in that: high speed metal-oxide-semiconductor driving circuit (13) output termination current limliting repeating resistance and bleeder resistance, the current limliting repeating resistance other end connects operation MOSFET(14) grid, bleeder resistance other end ground connection.
5. the window wiper control system of locomotive of pulse duration modulation according to claim 1, it is characterized in that: windshield wiper single speed DC machine current foldback circuit, windshield wiper single speed DC motor current detection circuit (15) connects operation MOSFET(14) and windshield wiper single speed DC machine overcurrent comparator circuit (16), windshield wiper single speed DC machine overcurrent comparator circuit (16) mouth connects windshield wiper single speed DC machine over-current detection buffer circuit (17) input end, windshield wiper single speed DC machine over-current detection buffer circuit (17) mouth connects the windshield wiper single speed DC machine over-current detection port of Central Processing Unit (CPU) (6), windshield wiper single speed DC motor current detection circuit (15) is noninductive high-power precision resistance, windshield wiper single speed DC machine overcurrent comparator circuit (16) is comparator circuit.
6. the window wiper control system of locomotive of pulse duration modulation according to claim 1, it is characterized in that windshield wiper single speed DC machine stops braking circuit: Central Processing Unit (CPU) (6) braking output port connects braking buffer circuit (7) input end, braking buffer circuit (7) mouth connects braking ambipolar metal-oxide-semiconductor driving circuit (8) input end, brake ambipolar metal-oxide-semiconductor driving circuit (8) mouth and connect braking MOSFET(9) grid, braking MOSFET(9) drain electrode connection common mode signal suppresses circuit (3) mouth, source electrode connects windshield wiper single speed DC machine (10) negative pole.
7. the window wiper control system of locomotive of pulse duration modulation according to claim 6; it is characterized in that: braking MOSFET(9) grid source electrode connects two-way pressure limited protection circuit; for a pair of stabilivolt differential concatenation; the drain-source utmost point connects RC peak restrained and absorbing circuit, and windshield wiper single speed DC machine (10) two ends connect afterflow protective circuit.
8. the window wiper control system of locomotive of pulse duration modulation according to claim 1, it is characterized in that: scraping arm position detecting circuit (18) detects the appointment stop position that arm mechanism (11) is scraped in windshield wiper single speed DC machine (10) output, scraping arm position detecting circuit (18) connection location detects buffer circuit (19) input end, and position probing buffer circuit (19) mouth connects Central Processing Unit (CPU) (6) position probing port.
9. the window wiper control system of locomotive of pulse duration modulation according to claim 1, it is characterized in that spraying electric machine control driving circuit, Central Processing Unit (CPU) (6) PWM spray port connects spray buffer circuit (20) input end, spray buffer circuit (20) mouth connects ambipolar metal-oxide-semiconductor driving circuit (21), ambipolar metal-oxide-semiconductor driving circuit (21) connects spray MOSFET(22) grid, drain electrode connects spray motor (23) negative pole, and source electrode connects power cathode.
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| CN201110421716.5A CN102490690B (en) | 2011-12-16 | 2011-12-16 | Pulse width modulation window wiper control system of locomotive |
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| CN201110421716.5A CN102490690B (en) | 2011-12-16 | 2011-12-16 | Pulse width modulation window wiper control system of locomotive |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103580565A (en) * | 2012-08-02 | 2014-02-12 | 重庆金美通信有限责任公司 | Direct current motor driving circuit with radiation suppressing and motor protecting functions |
| CN104442713A (en) * | 2014-12-05 | 2015-03-25 | 南车株洲电力机车有限公司 | Railway vehicle and wiper speed control device |
| CN104917144A (en) * | 2015-06-04 | 2015-09-16 | 科力远混合动力技术有限公司 | Relay control circuit in high-voltage system for hybrid electric vehicle |
| CN106312407B (en) * | 2015-07-02 | 2023-10-31 | 广州瑞松北斗汽车装备有限公司 | Three-way electrodeless supporting mechanism of passive trolley |
| CN105634375B (en) * | 2016-03-31 | 2020-06-26 | 广东美的环境电器制造有限公司 | Motor speed regulating device and household appliance |
| US9981632B2 (en) * | 2016-07-28 | 2018-05-29 | GM Global Technology Operations LLC | Systems for electrically isolating an electronic module from a front windshield and a rear window washer |
| CN107786132A (en) * | 2016-08-25 | 2018-03-09 | 中国航空工业集团公司西安飞行自动控制研究所 | A kind of high speed, high-precision servo control system for high power density motor |
| CN108969181A (en) * | 2018-07-19 | 2018-12-11 | 广州途悠悠健康科技有限公司 | A kind of human body heating physiotherapy equipment circuit structure |
| CN111301347A (en) * | 2019-12-10 | 2020-06-19 | 株洲桓基电气股份有限公司 | Electric windshield wiper control system of motor train unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE3930539A1 (en) * | 1989-09-13 | 1991-03-21 | Swf Auto Electric Gmbh | Car windscreen wiper drive with DC motor - has single Zener diode for voltage limiting coupled to both brush pairs |
| CN2546290Y (en) * | 2002-04-16 | 2003-04-23 | 株洲市铁路桓基电子电器厂 | Controller of wiper for locomotive |
| FR2851698B1 (en) * | 2003-02-21 | 2005-08-19 | Valeo Systemes Dessuyage | CIRCUIT FOR CONTROLLING A CONTINUOUS CURRENT ELECTRIC MOTOR AND WIPING SYSTEM USING SUCH A CIRCUIT |
| JP4464808B2 (en) * | 2004-12-20 | 2010-05-19 | 株式会社オートネットワーク技術研究所 | Power supply control device |
| DE112006002710B4 (en) * | 2005-10-17 | 2016-02-11 | Autonetworks Technologies, Ltd. | PWM signal generator |
| CN201951420U (en) * | 2011-01-17 | 2011-08-31 | 株洲联诚集团有限责任公司 | High-speed locomotive windscreen wiping and dust removing device |
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