CN111376868A - Wiper control circuit - Google Patents
Wiper control circuit Download PDFInfo
- Publication number
- CN111376868A CN111376868A CN201811647474.XA CN201811647474A CN111376868A CN 111376868 A CN111376868 A CN 111376868A CN 201811647474 A CN201811647474 A CN 201811647474A CN 111376868 A CN111376868 A CN 111376868A
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- Prior art keywords
- wiper
- relay
- control unit
- mosfet
- input
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- 230000009471 action Effects 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 17
- 230000008859 change Effects 0.000 claims description 3
- 238000010891 electric arc Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000004353 relayed correlation spectroscopy Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
- B60S1/00—Cleaning of vehicles
- B60S1/02—Cleaning windscreens, windows or optical devices
- B60S1/04—Wipers or the like, e.g. scrapers
- B60S1/06—Wipers or the like, e.g. scrapers characterised by the drive
- B60S1/08—Wipers or the like, e.g. scrapers characterised by the drive electrically driven
- B60S1/0803—Intermittent control circuits
- B60S1/0807—Intermittent control circuits using electronic control means, e.g. tubes, semiconductors
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
- H03K17/6871—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors the output circuit comprising more than one controlled field-effect transistor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Direct Current Motors (AREA)
Abstract
The invention provides a wiper control circuit, which comprises a control unit, a drive switch, a wiper relay and a wiper motor, wherein: the control unit controls the on-off of the driving switch, and the control unit controls the action of the wiper relay; the driving switch is connected between the wiper relay and the power supply, and when the wiper relay acts, the driving switch cuts off the electric connection between the wiper relay and the power supply; the wiper relay drives the wiper motor to rotate.
Description
Technical Field
The invention relates to the technical field of automotive electronics, in particular to a wiper control circuit.
Background
The wiper module is an indispensable part of automobile electronics, and the wiper needs to maintain basic functions even when the automobile body controller is in a limp state, so that the effect of the wiper module on the automobile body electronics is visible. In addition, the service life of the wiper module, that is, the service life of the wiper relay (the current relay used for controlling the wiper motor belongs to the mainstream), is also an important mark for measuring the vehicle body electronics, because the wiper is a frequently used function of a driver. Thus, how to design the wiper hardware circuit to improve the life of the relay is the first issue to be considered by the hardware engineer.
In the design of the conventional electronic wiper module for the vehicle body, as shown in fig. 1, the MCU port directly controls the on/off of the relay, or has a current diagnostic function to control the relay against the low-side driver chip, it can be confirmed that the switching between the relay contacts is performed in the state that the relay is in the charged state, i.e. the actuation of the relay is controlled through the Pin port of the MCU, no matter whether the relay contacts are in the LO gear (low gear of the wiper) or the HO gear (high gear of the wiper).
Disclosure of Invention
The invention aims to provide a wiper control circuit to solve the problem that the existing wiper control circuit is short in service life.
In order to solve the above technical problem, the present invention provides a wiper control circuit, which includes a control unit, a driving switch, a wiper relay, and a wiper motor, wherein:
the control unit controls the on-off of the driving switch, and the control unit controls the action of the wiper relay;
the driving switch is connected between the wiper relay and the power supply, and when the wiper relay acts, the driving switch cuts off the electric connection between the wiper relay and the power supply;
the wiper relay drives the wiper motor to rotate.
Optionally, in the wiper control circuit, the driving switch includes an input end, a first MOSFET tube and a second MOSFET tube, the input end of the driving switch is connected to the second output end of the control unit, a drain-source electrode of the first MOSFET tube is connected to the power source and a drain electrode of the second MOSFET tube, a source electrode of the second MOSFET tube is grounded, and a junction of the source electrode of the first MOSFET tube and the drain electrode of the second MOSFET tube is used as the output end of the driving switch to connect the input end of the wiper relay.
Optionally, in the wiper control circuit, the wiper control circuit further includes a first capacitor, a second capacitor and a third capacitor, the first capacitor and the second capacitor are connected between the power supply and the ground, and the third capacitor is connected between the power supply and the output end of the wiper relay.
Optionally, in the wiper control circuit, the wiper relay includes a coil, a first output terminal and a second output terminal, wherein:
two ends of the coil are respectively connected with the first input end of the control unit and the relay power supply;
the first output end of the wiper relay is connected with the low gear of the wiper motor, and the second output end of the wiper relay is connected with the high gear of the wiper motor.
Optionally, in the wiper control circuit, when the first input terminal of the control unit outputs a first level, the input terminal of the wiper relay is connected to the first output terminal of the wiper relay, and when the first input terminal of the control unit outputs a second level, the input terminal of the wiper relay is connected to the second output terminal of the wiper relay.
Optionally, in the wiper control circuit, when the wiper is in a stop state, the second input terminal of the control unit outputs an OFF state signal, and when both the first MOSFET tube and the second MOSFET tube are turned OFF, the wiper relay and the wiper motor do not act.
Optionally, in the wiper control circuit, when the wiper is in a working state, the second input terminal of the control unit outputs an ON state signal, the first MOSFET tube is turned ON, and the second MOSFET tube is turned off, at this time, if the first input terminal of the control unit outputs a first level, the wiper motor rotates at a first speed, and if the first input terminal of the control unit outputs a second level, the wiper motor rotates at a second speed, and the first speed is lower than the second speed.
Optionally, in the wiper control circuit, when the wiper needs to change the operating speed or stop working, the second input terminal of the control unit outputs a shift state signal, the second MOSFET tube is turned on, the first MOSFET tube is turned off, at this time, because the source electrode of the second MOSFET tube is grounded, the residual energy in the wiper motor is released to the ground through the second MOSFET tube, after 10ms, the second MOSFET tube is turned off, and the control unit controls the wiper relay to perform contact switching.
Optionally, in the wiper control circuit, when the wiper is switched from a stop state to an operating state, the first input terminal of the control unit outputs a first level or a second level according to a running speed requirement of the wiper, and the second input terminal of the control unit outputs an ON state signal.
In the wiper control circuit provided by the invention, when the wiper relay acts, the drive switch cuts off the electric connection between the wiper relay and the power supply, no current flows through the wiper relay at the moment, the wiper relay is in a power-off state, and the phenomenon that when the contact of the wiper relay is separated or sucked, electric arc and heat are generated between the two contacts due to electrification, the service life of the wiper relay is influenced, and even a metal contact is fused is avoided. According to the description of the service life cycle of the relay, when the relay is in power-off operation, the service life is 1000000 times, when the relay is in power-on operation, the service life is 100000 times, and the difference between the two different service lives is 10 times. Therefore, the design idea of the wiper is changed into the power-off operation, and the service life of the wiper relay can be greatly prolonged. Therefore, the invention adds a half-bridge chip as a driving switch, thereby achieving the purpose of the relay power-off operation.
Drawings
Fig. 1 is a schematic view of a conventional wiper module;
FIGS. 2-3 are schematic views of a wiper control circuit according to an embodiment of the present invention;
shown in the figure: 10-a control unit; 20-a drive switch; 30-a wiper relay; 40-wiper motor.
Detailed Description
The wiper control circuit according to the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
The core idea of the invention is to provide a wiper control circuit to solve the problem of short service life of the existing wiper control circuit.
In order to achieve the above idea, the present invention provides a wiper control circuit, comprising a control unit, a driving switch, a wiper relay, and a wiper motor, wherein: the control unit controls the on-off of the driving switch, and the control unit controls the action of the wiper relay; the driving switch is connected between the wiper relay and the power supply, and when the wiper relay acts, the driving switch cuts off the electric connection between the wiper relay and the power supply; the wiper relay drives the wiper motor to rotate.
An embodiment of the present invention provides a wiper control circuit, as shown in fig. 2, including a control unit 10, a driving switch 20, a wiper relay 30, and a wiper motor 40, wherein: the control unit 10 controls the on-off of the driving switch 20, and the control unit 10 controls the wiper relay 30 to act; the driving switch 20 is connected between the wiper relay 30 and the power supply Vbat, and when the wiper relay 30 is operated, the driving switch 20 cuts off the electrical connection between the wiper relay 30 and the power supply Vbat; the wiper relay 30 drives the wiper motor 40 to rotate.
As shown in fig. 3, in the wiper control circuit, the driving switch 20 includes an input terminal 21, a first MOSFET M1 and a second MOSFET M2, the input terminal 21 of the driving switch is connected to the second output terminal 12 of the control unit, the drain and source electrodes of the first MOSFET are respectively connected to the power Vbat and the drain of the second MOSFET M2, the source of the second MOSFET M2 is grounded, and the junction of the source of the first MOSFET M1 and the drain of the second MOSFET M2 is used as the output terminal of the driving switch and is connected to the input terminal 31 of the wiper relay 30. The wiper control circuit further includes a first capacitor C1, a second capacitor C2 and a third capacitor C3, the first capacitor C1 and the second capacitor C2 being connected between the power supply Vbat and ground, the third capacitor C3 being connected between the power supply Vbat and the output terminal 22 of the wiper relay 30.
Specifically, in the wiper control circuit, the wiper relay 30 includes a coil, a first output terminal 32 and a second output terminal 33, wherein: two ends of the coil are respectively connected with the first input end 11 of the control unit 10 and the RELAY power supply VBAT _ RELAY; the first output end 32 of the wiper relay 30 is connected to the low gear L of the wiper motor 40, and the second output end 33 of the wiper relay 30 is connected to the high gear H of the wiper motor 40. The input terminal 31 of the wiper relay 30 is connected to the first output terminal 32 of the wiper relay 30 when the first input terminal 11 of the control unit 10 outputs a first level, and the input terminal 31 of the wiper relay 30 is connected to the second output terminal 33 of the wiper relay 30 when the first input terminal 11 of the control unit 10 outputs a second level.
Further, in the wiper control circuit, when the wiper is in a stop state, the second input terminal 12 of the control unit 10 outputs an OFF state signal, and when both the first MOSFET M1 and the second MOSFET M2 are turned OFF, neither the wiper relay 30 nor the wiper motor 40 is operated. When the wiper is in a working state, the second input terminal 12 of the control unit 10 outputs an ON state signal, the first MOSFET M1 is turned ON, and the second MOSFET M2 is turned off, at this time, if the first input terminal 11 of the control unit 10 outputs a first level, the wiper motor 40 rotates at a first speed, and if the first input terminal 11 of the control unit 10 outputs a second level, the wiper motor 40 rotates at a second speed, and the first speed is less than the second speed.
In addition, in the wiper control circuit, when the wiper needs to change the running speed or stop working, the second input end 12 of the control unit 10 outputs a gear-shifting state signal, the second MOSFET M2 is turned on, the first MOSFET M1 is turned off, at this time, since the source of the second MOSFET is grounded, the residual energy in the wiper motor is released to the ground through the second MOSFET, after 10ms, the second MOSFET is turned off, and the control unit controls the wiper relay to perform contact switching. When the wiper is switched from a stop state to an operating state, the first input terminal 11 of the control unit 10 outputs a first level or a second level according to the operating speed requirement of the wiper, and then the second input terminal 12 of the control unit 10 outputs an ON state signal.
In the wiper control circuit provided by the invention, when the wiper relay 30 acts, the drive switch 20 cuts off the electric connection between the wiper relay 30 and the power supply, no current flows through the wiper relay 30 at the moment, the wiper relay 30 is in a power-off state, and the phenomenon that when the contacts of the wiper relay 30 are separated or sucked, electric arc and heat are generated between the two contacts due to electrification, the service life of the wiper relay 30 is influenced, and even a metal contact is fused is avoided. According to the description of the service life cycle of the relay, when the relay is in power-off operation, the service life is 1000000 times, when the relay is in power-on operation, the service life is 100000 times, and the difference between the two different service lives is 10 times. Therefore, the design concept of the wiper is changed into the power-off operation, and the service life of the wiper relay 30 is greatly prolonged. Therefore, the invention adds a half-bridge chip as the driving switch 20, thereby achieving the purpose of the relay power-off operation.
In summary, the above embodiments describe the different configurations of the wiper control circuit in detail, and it goes without saying that the present invention includes but is not limited to the configurations listed in the above embodiments, and any modifications based on the configurations provided by the above embodiments are within the scope of the present invention. One skilled in the art can take the contents of the above embodiments to take a counter-measure.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (9)
1. A wiper control circuit, comprising a control unit, a drive switch, a wiper relay, and a wiper motor, wherein:
the control unit controls the on-off of the driving switch, and the control unit controls the action of the wiper relay;
the driving switch is connected between the wiper relay and the power supply, and when the wiper relay acts, the driving switch cuts off the electric connection between the wiper relay and the power supply;
the wiper relay drives the wiper motor to rotate.
2. The wiper control circuit according to claim 1, wherein the driving switch comprises an input terminal, a first MOSFET tube and a second MOSFET tube, the input terminal of the driving switch is connected to the second output terminal of the control unit, the drain and source electrodes of the first MOSFET tube are respectively connected to the power supply and the drain electrode of the second MOSFET tube, the source electrode of the second MOSFET tube is grounded, and the junction of the source electrode of the first MOSFET tube and the drain electrode of the second MOSFET tube serves as the output terminal of the driving switch and is connected to the input terminal of the wiper relay.
3. The wiper control circuit of claim 1 further comprising a first capacitor, a second capacitor and a third capacitor, said first and second capacitors being connected between said power supply and ground, said third capacitor being connected between said power supply and an output of said wiper relay.
4. The wiper control circuit of claim 2 wherein the wiper relay includes a coil, a first output and a second output, wherein:
two ends of the coil are respectively connected with the first input end of the control unit and the relay power supply;
the first output end of the wiper relay is connected with the low gear of the wiper motor, and the second output end of the wiper relay is connected with the high gear of the wiper motor.
5. The wiper control circuit of claim 4 wherein the input of the wiper relay is connected to the first output of the wiper relay when the first input of the control unit outputs a first level and the input of the wiper relay is connected to the second output of the wiper relay when the first input of the control unit outputs a second level.
6. The wiper control circuit according to claim 5 wherein when the wiper is in a stopped state, the second input of the control unit outputs an OFF state signal, and when both the first MOSFET and the second MOSFET are turned OFF, neither the wiper relay nor the wiper motor is actuated.
7. The wiper control circuit according to claim 6 wherein when the wiper is in an operational state, the second input of the control unit outputs an ON state signal, the first MOSFET transistor is ON, and the second MOSFET transistor is OFF, wherein if the first input of the control unit outputs a first level, the wiper motor rotates at a first speed, and if the first input of the control unit outputs a second level, the wiper motor rotates at a second speed, the first speed being less than the second speed.
8. The wiper control circuit according to claim 7, wherein when the wiper needs to change the operation speed or stop working, the second input terminal of the control unit outputs a shift state signal, the second MOSFET is turned on, the first MOSFET is turned off, when the source of the second MOSFET is grounded, the residual energy in the wiper motor is discharged to the ground through the second MOSFET, and after 10ms, the second MOSFET is turned off, and the control unit controls the wiper relay to perform contact switching.
9. The wiper control circuit according to claim 7 wherein the first input of the control unit outputs a first level or a second level in accordance with the operating speed requirement of the wiper and the second input of the control unit outputs an ON status signal when the wiper switches from a stopped state to an operative state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811647474.XA CN111376868A (en) | 2018-12-29 | 2018-12-29 | Wiper control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811647474.XA CN111376868A (en) | 2018-12-29 | 2018-12-29 | Wiper control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111376868A true CN111376868A (en) | 2020-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811647474.XA Pending CN111376868A (en) | 2018-12-29 | 2018-12-29 | Wiper control circuit |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020008485A1 (en) * | 2000-07-24 | 2002-01-24 | Yazaki Corporation | Wiper control apparatus |
| CN101722931A (en) * | 2009-12-25 | 2010-06-09 | 奇瑞汽车股份有限公司 | Wiper control system and control method thereof |
| CN202345629U (en) * | 2011-10-29 | 2012-07-25 | 郑州宇通客车股份有限公司 | Windscreen wiper driving control circuit |
| CN202944314U (en) * | 2012-09-03 | 2013-05-22 | 马瑞利汽车电子(广州)有限公司 | Windshield wiper control circuit |
-
2018
- 2018-12-29 CN CN201811647474.XA patent/CN111376868A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020008485A1 (en) * | 2000-07-24 | 2002-01-24 | Yazaki Corporation | Wiper control apparatus |
| CN101722931A (en) * | 2009-12-25 | 2010-06-09 | 奇瑞汽车股份有限公司 | Wiper control system and control method thereof |
| CN202345629U (en) * | 2011-10-29 | 2012-07-25 | 郑州宇通客车股份有限公司 | Windscreen wiper driving control circuit |
| CN202944314U (en) * | 2012-09-03 | 2013-05-22 | 马瑞利汽车电子(广州)有限公司 | Windshield wiper control circuit |
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