CN200988478Y

CN200988478Y - Translational scraper changer

Info

Publication number: CN200988478Y
Application number: CN 200620148245
Authority: CN
Inventors: 王德荣
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-11-01
Filing date: 2006-11-01
Publication date: 2007-12-12
Anticipated expiration: 2016-11-01

Abstract

The utility model relates to a translatory wiper control device for the ship, in particular to a wiper converter, which is characterized in comprising an impulse width modulated integrated circuit and two direct current amplifier circuits. The impulse width modulated integrated circuit is connected with a dead zone time control circuit and an oscillator input circuit. A closed loop circuit control unit is constructed by the impulse width modulated integrated circuit, a wave filter circuit and RC discharge circuit, the output of the transformer is connected with the wiper driving motor directly. The utility model has the advantages of protecting the wiper in all sides with safety and reliability.

Description

Parallel-moving type Windshield Wiper changer

Technical field

The utility model relates to a kind of control setup of parallel-moving type Windshield Wiper peculiar to vessel, is specially a kind of control and protection of Windshield Wiper changer.

Background technology

Parallel-moving type Windshield Wiper peculiar to vessel is the electromechanical integrated product that is used on the window-glass of ship-handling chamber, can remove rainwater on glass effectively, makes chaufeur that broad, the visual field clearly be arranged, and guarantees safety of navigation, is the indispensable equipment of ship's navigation.

Early stage translation Windshield Wiper has the alternating current dynamo of employing as driving power; this product can not carry out speed control mostly; even it is segmentation control that speed control is arranged; and use decompression speed; when jam appears in the movable parts damage; injure all often, can not effectively protect motor and protection Windshield Wiper.The Windshield Wiper that later stage produces has adopted the small size DC machine as propulsion source mostly; solve Windshield Wiper and need carry out the speed control problem; but direct current (DC) is adjustable continuously from 0～220V, 1000W left and right sides power, rotating speed need steadily and Windshield Wiper such as protects when the jam fault occurring to fail to solve at problem always, and the stability of Windshield Wiper, reliability are determined by controller to a great extent.

Summary of the invention

The purpose of this utility model is that at the requirement of Windshield Wiper on operation stability and reliability providing a kind of can carry out general protection to the drive motor and the driving circuit of Windshield Wiper, safe and reliable Windshield Wiper changer.

The technical solution of the utility model is as follows: a kind of parallel-moving type Windshield Wiper changer, comprise a pulse width modulation controlled integrated circuit and two circuits of direct current amplifier, the pulse width modulation controlled integrated circuit also is connected with dead-time control circuit and oscillator input circuit, pulse width modulation controlled integrated circuit and filter circuit and RC discharge loop constitute closed loop control unit, the mouth direct connection Windshield Wiper drive motor of changer.

Aforesaid parallel-moving type Windshield Wiper changer, wherein, the pulse width modulation controlled integrated circuit adopts LM494 or TL494 integrated circuit, and this integrated circuit is made up of reference voltage generating circuit, oscillating circuit, intermittent phase adjustment circuit, two error amplifiers, pulse duration modulation comparator and output circuits.

Aforesaid parallel-moving type Windshield Wiper changer, wherein, circuits of direct current amplifier adopts RC4558 type integrated circuit.

The utility model adopts to exchange supplies with changer, vdc, electric current that changer is confessed detect, the voltage of the signal automatic control motor supply that detects, form a closed loop, as causing motor rotation blockage because of reasons such as mechanical jams, guaranteeing the 90S that works under the motor maximum operating currenbt, at this moment motor and changer should be all in the scope work of safety power consumption, surpass and allow work-hours, changer will stop to supply with working power to armature, enter the general protection state, the while alarm equipment alarm, alarm lamp is lighted; The power supply of closing controller (300S at interval) back is got rid of as fault, and Windshield Wiper can continue normal operation, does not get rid of changer as fault and enters guard mode once more.The utility model is safe and reliable, can carry out general protection to the drive motor and the control circuit of Windshield Wiper.

Description of drawings

Fig. 1 is a schematic block circuit diagram of the present utility model.

Fig. 2 is physical circuit figure of the present utility model.

Fig. 3 is LM494 lsi internal circuit figure.

Fig. 4 is RC4558 lsi internal circuit figure.

The specific embodiment

As shown in Figure 1 and Figure 2, parallel-moving type Windshield Wiper changer comprises a pulse width modulation controlled integrated circuit and two circuits of direct current amplifier, the pulse width modulation controlled integrated circuit also is connected with dead-time control circuit and oscillator input circuit, pulse width modulation controlled integrated circuit and filter circuit and RC discharge loop constitute closed loop control unit, the mouth direct connection Windshield Wiper drive motor of changer.

Among Fig. 2, line terminal row 1～14 ^#In 11 ^#There is the signal input will make IC circuit ₃The pulse width signal of 10 pin output by Q ₃Bypass makes terminal 14 ^#No pulse width signal is sent; Make the control grid of field effect transistor on the master board not have drive voltage signal, thereby whole armature dead electricity is protected.

12 ^#Terminal and 5 ^#Terminal compares, and as excessive because of the major loop output end current, can make IC circuit ₁7 pin the voltage signal less than 15V greater than 0V is arranged, this voltage signal carries out dividing potential drop by R21 and R2 and supplies with IC ₂5 pin and 3 pin, pass through IC again ₂7 and 1 pin output supply with IC ₃2 pin, this voltage signal is as IC ₃The reference signal of internal amplifier I, the reference signal that is to say amplifier I are that the size with the working current of drive motor changes at any time, are dynamic benchmark, and the driving voltage of setting is the magnitude of voltage of a voltage stabilizing.

, the working current of motor dispatches from the factory when demarcating greater than 4A IC if surpassing changer less than the current value of 4.5A ₃3 pin will export high potential, stop the output pulse width signal, that is to say IC ₃10 pin pulse-free signals output, thereby terminal 14 ^#The control grid of the field effect transistor of main control loop is supplied with in pulse-free signal output, prevents that drive motor from burning motor because of super-high-current, thus the protection motor; Pass through capacitor C ₄, C ₅Discharge and recharge, by R ₂₅And C ₄, C ₅Time constant decision guard time and reset time.

If the working current of motor is no more than the factory-designed working current value of changer, this loop is actually the closed loop circuit of drive motor voltage stabilizing, after being set the driving voltage setting, the working current of drive motor may increase working current or minimizing because of reasons such as machinery, power line voltages, cause voltage on the armature to diminish or greatly, can stablize voltage on the armature by this closed loop, realize the constant voltage drive motor.

Protection control circuit itself also has protective circuit, and it has two kinds of protections:

1. cause main control circuit out of control because of auxiliary power circuit is out of order, the consequence of its generation is difficult to expect, when accessory feed+the 15V dead electricity, can make Z ₁Can not conducting, cause Q ₄End IC ₃Dead band period mal and quit work, thereby protect.

2.IC ₃14 pin output reference voltage 5V, this voltage occurs descending because of certain reason, can supply with this circuit working by the 7 pin output constant current of IC2, is unlikely to make control circuit out of control, and the protection of carrying out.

As shown in Figure 3, the LM494 integrated circuit is made up of reference voltage generating circuit, oscillating circuit, intermittent phase adjustment circuit, two error amplifiers, pulse duration modulation comparator and output circuits.LM494 integrated circuit shown in Fig. 2 :+V ₁,-V ₁Being 1,2 pin of integrated circuit, is homophase and the inverting input of error amplifier I; + V ₂,-V ₂Being 16,15 pin of integrated circuit, is homophase and the inverting input of error amplifier II; COMP is 3 pin of integrated circuit, is phase correction and gain control end; DTC is 4 pin of integrated circuit, is intermittently to nurse one's health the Dead Time control end, can make closing time from 2% linear change to 100% when adding 0～3.3V voltage on this pin; RT, CT are integrated circuit oscillator generation circuit, external oscillation resistance and oscillating capacitance, this resistance and electric capacity decision-making circuit frequency of operation; 7 pin are ground terminal; C ₁, C ₂And E ₁, E ₂Be respectively the collector and emitter of inner two the final stage output triodes of LM494; 12 pin are power supply side; OC is 13 pin of LM494, is output control terminal, is the single-ended way of output in parallel during this pin ground connection, when connecing 14 pin for recommending the way of output; VREF is 14 pin of LM494, is the 5V reference voltage output end, maximum current output 10mA.

The working process of LM494 integrated circuit is as follows: when feedback signal during greater than setting value, pulse duration modulation effect by LM494, its I, the output of II comparison amplifier, the output voltage of 3 pin is risen, the signal of this rising is by inner current rectifying and wave filtering circuit and isolate amplification output, makes the corresponding decline of voltage of dc control signal, and the control signal of this decline and major loop output circuit form closed loop, output voltage is descended, reach the burning voltage purpose; Feedback signal is during less than setting value, and principle of work is identical.

Transistorized effect in this control circuit:

1.Q ₁: control pulse width signal discharge loop, making pulse width signal is rapidly 0.

2.Q ₂: pulse width signal amplifies driving, supplies with the grid of the field effect transistor in the main control circuit.

3.Q ₃: the drive motor overcurrent protection, with IC ₁Overcurrent protection carry out duplicate protection.

4.Q ₄: prevent the protection of auxiliary circuit dead electricity.

Fact proved and utilize circuit control sensitivity that LM494 makes and control accuracy, replace the single loop control circuit of some cost height, circuit complexity fully than higher.To be that closed loop single loop control that main element is realized has novel, circuit is simple, with low cost, characteristics such as control process is stable with LM494.

The Windshield Wiper changer is when producing, and strict the adjustment tested concrete parameter request:

1. use withstand voltage instrument between the lead-out terminal of changer and the shell, apply the voltage of 2000V, 1min does not have the puncture scintillation, and drain current is less than 1mA, for qualified.

2. export the drive motor of termination Windshield Wiper; require no-load current less than 150mA; after making output voltage meet the motor input voltage by adjustment; apply load to motor; when motor rotation blockage; requiring the electric current of converter protection action is qualified greater than 4A less than 4.5A: require changer can not transship in this scope and damage, electric machine temperature rise should be lower than the motor ultimate temperature.

Claims

1. parallel-moving type Windshield Wiper changer, it is characterized in that: comprise a pulse width modulation controlled integrated circuit and two circuits of direct current amplifier, the pulse width modulation controlled integrated circuit also is connected with dead-time control circuit and oscillator input circuit, pulse width modulation controlled integrated circuit and filter circuit and RC discharge loop constitute closed loop control unit, the mouth direct connection Windshield Wiper drive motor of changer.

2. parallel-moving type Windshield Wiper changer as claimed in claim 1, it is characterized in that: the pulse width modulation controlled integrated circuit adopts LM494 or TL494 type integrated circuit, is made up of reference voltage generating circuit, oscillating circuit, intermittent phase adjustment circuit, two error amplifiers, pulse duration modulation comparator and output circuits.

3. parallel-moving type Windshield Wiper changer as claimed in claim 1 or 2 is characterized in that: circuits of direct current amplifier adopts RC4558 type integrated circuit.