CN202345629U

CN202345629U - Windscreen wiper driving control circuit

Info

Publication number: CN202345629U
Application number: CN2011204196963U
Authority: CN
Inventors: 彭亚敏; 卢长军; 李剑峰
Original assignee: Zhengzhou Yutong Bus Co Ltd
Current assignee: Zhengzhou Yutong Bus Co Ltd
Priority date: 2011-10-29
Filing date: 2011-10-29
Publication date: 2012-07-25
Anticipated expiration: 2021-10-29

Abstract

The utility model relates to a windscreen wiper control circuit. A control chip and a power tube are additionally provided on the basis of the original circuit; the output end of the control chip is connected with a relay and the power tube, and the control chip is used for controlling the connection and disconnection sequences of the relay and the power tube; normally-opened contacts of the power tube and the relay are connected in series to be connected to a windscreen wiper motor. When the windscreen wiper control circuit works, the relay is connected firstly, and then the power tube is connected; and when the windscreen wiper control circuit is disconnected, the power tube is disconnected firstly, and then the relay is disconnected. By utilizing the characteristic that the power tube can bear instant high-voltage, the contact of the relay is protected, the service life of the relay is prolonged, the work reliability of a windscreen wiper system is improved, and the using cost is reduced.

Description

A kind of wiper Drive and Control Circuit

Technical field

The utility model relates to a kind of wiper Drive and Control Circuit.

Background technology

At present, the wiper motor is a permanent magnet DC motor, during its work; Start the rush current of 10 times of 5 ∽ of promising running current of moment; Mostly traditional wiper control circuit design is that by relay direct drive motor load when relay broke off, relay contact arcing phenomenon was very serious; The rush current of this arcing phenomenon and electric motor starting moment all can the major injury relay contact, causes the inefficacy of relay.When wiper intermittently during shelves work, the break-make that relay is frequent, cause the actual effect of wiper system more easily, influence traffic safety.Receive the influence of relay characteristic and load-carrying capacity, traditional wiper control circuit is unable from basic this kind of solution circuit problem.

Summary of the invention

The purpose of the utility model provides a kind of wiper Drive and Control Circuit, can reduce the damage of the relay in the wiper, prolongs the service life of wiper.

The technical scheme of the utility model is: for solving the problems of the technologies described above; The utility model provides a kind of wiper circuit; Comprise relay and wiper motor; The open contact of relay is serially connected in the machine operation circuit of wiper, and described wiper control circuit also includes I/O input and arrangement unit, control chip and power tube, and power tube is serially connected in the pull up circuit of wiper motor; The input end of I/O input and arrangement unit is used for linking to each other with the wiper control unit; The input end of control chip links to each other with the mouth of I/O input and arrangement unit, and the mouth of control chip links to each other with the control end of relay and power tube, the break-make order of control chip control relay and power tube.

Described Drive and Control Circuit also includes voltage filter and voltage regulation unit, and described voltage filter and voltage regulation unit and I/O input and arrangement unit, control chip, power tube link to each other, for they provide reliable and stable working power.

The described relay that links to each other with control chip comprises fast relay and slow-speed relay; The open contact two ends of fast relay link to each other with the high speed line end of power tube and wiper motor respectively, and the open contact two ends of slow-speed relay link to each other respectively at the low speed line end of power tube and wiper motor.

Described power tube comprises high-speed power pipe and low speed power pipe; The high-speed power pipe links to each other with motor high speed line end with the open contact series connection back of fast relay; Link to each other with motor low speed line end behind the open contact of low speed power pipe and slow-speed relay, the control end of the control end of high-speed power pipe and low speed power pipe all links to each other with the mouth of control chip.

Described control chip is MCU logical process and output control chip.

The beneficial effect of the utility model is: it is in original control circuit, to increase the I/O input and put unit, control chip, power tube in order, and by control chip power controlling pipe and relay on-off, during work; Adopt first cutin relay, connect power tube again, during disconnection; Break off power tube earlier, break off the mode of operation of relay again, utilize the impact-resistant characteristic of power tube; Being connected by power tube and relay normally open contact drives rain shaving electrical machine work, guarantees the reliability of wiper control circuit.The life-span and the use cost that significantly prolong wiper controller loop are very low, improve the functional reliability of windscreen wiper system.

Description of drawings

Fig. 1 is the wiper schematic block circuit diagram of embodiment one;

Fig. 2 is the wiper schematic block circuit diagram of embodiment two.

The specific embodiment

Further specify below in conjunction with the embodiment of accompanying drawing the utility model.

Embodiment one

As shown in Figure 1, the wiper Drive and Control Circuit includes the I/O input and puts unit, MCU logical process and output control unit, power filter and voltage regulation unit, high-speed power pipe, low speed power pipe, fast relay, slow-speed relay, wiper motor in order.The input end of I/O input and arrangement unit and high speed input switch, low speed input switch link to each other with input switch intermittently; The mouth of I/O input and arrangement unit is linked the input end of MCU logical process and output control unit; The mouth of MCU logical process and output control unit links to each other with the control end of power tube, fast relay and slow-speed relay; Power tube links to each other with wiper motor high speed line end with the open contact series connection back of fast relay; Power tube with link on the wiper motor low speed line end after the open contact of slow-speed relay is connected; Power filter and voltage regulation unit and I/O input and arrangement unit, MCU logical process and output control unit, power tube link to each other, for they provide stablize can be high power supply.

After low speed input switch closure, to handle through the filtering transformation of finishing circuit, this signal gets into the MCU Logical processing unit; MCU at first drives slow-speed relay; Make that the open contact of slow-speed relay is closed, then, MCU makes power tube drive the work of Wiper motor low speed coil electricity.Realized the unloaded closed of relay contact, avoided the windscreen wiper coil to start the impact of moment relay contact; When the low speed input switch broke off, MCU at first made the power tube outage, and Wiper motor low speed coil quits work, and MCU breaks off slow-speed relay then, made the open contact of slow-speed relay break off, and had avoided the relay band to carry the arcing that produces when breaking off.

After high speed input switch closure, to handle through the filtering transformation of finishing circuit, this signal gets into the MCU Logical processing unit; MCU at first drives fast relay; Make that the open contact of fast relay is closed, then, MCU enable power pipe drives the work of Wiper motor high speed coil electricity; Realized the unloaded closed of relay contact, avoided the windscreen wiper coil to start the impact of moment relay contact; When the high speed input switch broke off, MCU at first made the power tube outage, and Wiper motor high speed coil quits work, and MCU breaks off fast relay then, made the open contact of fast relay break off, and had avoided the relay band to carry the arcing that produces when breaking off.

After intermittence input switch closure, controller carries out work according to lo-speed mode of operation, only after each circle finishes, delays time for 6 seconds, goes round and begins again periodical duty.

Embodiment two

Among the embodiment one; The shared power tube of the open contact of fast relay open contact and slow-speed relay; This moment, power tube need select to satisfy the high power valve of wiper motor high speed coil working; When the wiper motor was in the slow running state, the power of the power tube of this moment just need not selected too big.We improve it on the basis of embodiment one; Shown in Fig. 2; It is a high-speed power pipe and a low speed power pipe that power tube becomes; The high-speed power pipe links to each other with wiper motor high speed line end with the open contact series connection back of fast relay, and the low speed power pipe links to each other with wiper motor low speed line end with the open contact series connection back of slow-speed relay.Its working process is the same with embodiment one.

Claims

1. wiper Drive and Control Circuit; Comprise relay and wiper motor; The open contact of relay is serially connected in the machine operation circuit of wiper, it is characterized in that: described wiper control circuit also includes I/O input and arrangement unit, control chip and power tube, and power tube is serially connected in the pull up circuit of wiper motor; The input end of I/O input and arrangement unit is used for linking to each other with the wiper control unit; The input end of control chip links to each other with the mouth of I/O input and arrangement unit, and the mouth of control chip links to each other with the control end of relay and power tube, the break-make order of control chip control relay and power tube.

2. wiper Drive and Control Circuit according to claim 1; It is characterized in that: described control circuit also includes voltage filter and voltage regulation unit; Described voltage filter and voltage regulation unit and I/O input and arrangement unit, control chip, power tube link to each other, for they provide reliable and stable working power.

3. wiper Drive and Control Circuit according to claim 2; It is characterized in that: the described relay that links to each other with control chip comprises fast relay and slow-speed relay; The open contact two ends of fast relay link to each other with the high speed line end of power tube and wiper motor respectively, and the open contact two ends of slow-speed relay link to each other respectively at the low speed line end of power tube and wiper motor.

4. wiper Drive and Control Circuit according to claim 3; It is characterized in that: described power tube comprises high-speed power pipe and low speed power pipe; The high-speed power pipe links to each other with motor high speed line end with the open contact series connection back of fast relay; Link to each other with motor low speed line end behind the open contact of low speed power pipe and slow-speed relay, the control end of the control end of high-speed power pipe and low speed power pipe all links to each other with the mouth of control chip.

5. according to any described wiper Drive and Control Circuit in the claim 1 to 4, it is characterized in that: described control chip is MCU logical process and output control chip.