CN202944314U - Windshield wiper control circuit - Google Patents
Windshield wiper control circuit Download PDFInfo
- Publication number
- CN202944314U CN202944314U CN201220444114.1U CN201220444114U CN202944314U CN 202944314 U CN202944314 U CN 202944314U CN 201220444114 U CN201220444114 U CN 201220444114U CN 202944314 U CN202944314 U CN 202944314U
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- China
- Prior art keywords
- windshield wiper
- control circuit
- switch
- treater
- relay
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Abstract
The utility model relates to a windshield wiper control circuit. According to the control circuit, through using of a relay and match of a high side switch and a low side switch of an intelligent power device, except that functions of a common windshield wiper drive circuit are achieved, a windshield wiper motor is also effectively protected, the windshield wiper drive circuit and drive noise are reduced, a diagnosis function of the windshield wiper motor is added, and the protection problems of over current and over voltage which occur in operation of the windshield wiper motor are resolved.
Description
Technical field
The utility model relates to the control circuit of windshield wiper.
Background technology
Vehicle is daily to travel, keep the good visual environment by dust and foreign matter that rain brush is cleared away on the car windscreen Windshield, very important to traffic safety, therefore very important as the quality of the rain brush driving circuit that drives the rain brush action, it is comfortable and safe that it has directly had influence on people's driving.
The driving circuit of traditional rain brush as Fig. 1, is undertaken by simple Control, and when intermittently keeping off, when relay drove Wiper motor with different closed frequencies, it had inevitably brought the driving noise.Simultaneously, it can not effectively protect Wiper motor.As everyone knows; car windscreen often can fall into foreign matter; such as sand and dust, mud rain, leaf footpath etc.; rain brush repeatedly in paddling these foreign material may deposit gradually and cause the resistance that blade of windscreen wiper runs into to strengthen along with blade of windscreen wiper; when the resistance that runs into when blade of windscreen wiper is excessive; in the situation that can not diagnose the Wiper motor load, be easy to cause rain brush wire fuse or motor to burn out.
Device for power switching in automobile electronic system has flash (High Side Driver), low limit (Low Side Driver) and bridge switch usually.Usually the smart power switch device between power supply and load is referred to as the flash switch, and the smart power switch device between load and ground is referred to as lower edge switch.
The utility model content
The utility model is intended to provide a kind of rain brush driving circuit with diagnosis function, and it not only can reduce noise, can also prevent the motor burning.
windshield wiper control circuit described in the utility model, be connected the flash switch between the input end of Wiper motor and anode, be connected lower edge switch between the input end of Wiper motor and ground, be in series with the diode that flows to the base switch between flash switch and lower edge switch, the flash switch is connected with the base switch and is connected treater, treater output control signal, control switching and the switching degree of flash switch and base switch, the flash switch also is integrated with the current feedback circuit that can detect the Wiper motor electric current, current feedback circuit can convert current signal to voltage signal and be input in treater, make treater can judge the working condition of motor.
Windshield wiper control circuit described in the utility model, during normal operation, the flash switch is coming under the driving signal function of self processor, exports corresponding electric current to Wiper motor, and rain brush works.When the needs rain brush stops; treater sends signal control flash switch and cuts out; lower edge switch is opened; Wiper motor quits work; the energy that stop producing because of Wiper motor this moment can be released in ground circuit by lower edge switch; thereby the impact of having protected the flash switch to produce due to load when turn-offing inductive load; the harm that avoided Wiper motor to quit work inverse electromotive force that moment produces brings the flash switch; even the Wiper motor braking energy of having released, guaranteed the safety of flash switch.Described windshield wiper control circuit; jointly completed the speed of Wiper motor controls by flash switch and lower edge switch; when replacing speed that old relay carries out according to corresponding frequencies and control; it can also synchronously detect the electric current that flows through Wiper motor; thereby can carry out the diagnosis of Wiper motor running condition according to size of current; the safety of protection Wiper motor when stall and overcurrent, reliability and the service life of having improved Wiper motor.Simultaneously, it does not exist in the rain brush working process, and relay is frequent switches the noise that brings, thereby the noise in working process is also lower.
Windshield wiper control circuit also can comprise reverse connection prevention protection circuit; described reverse connection prevention protection circuit comprises a relay; coil one end of this relay connects anode, and the other end connects after backward diode ground connection again, and the normally closed contact of relay is connected between anode and flash switch.Described reverse connection prevention protection circuit, under normal circumstances, normally closed contact is adhesive always, the work of Wiper motor is not exerted an influence; When battery generation reversal connection, or should be outside negative variation when producing inverse electromotive force, the normally closed contact of relay disconnects, battery is not powered to flash switch and Wiper motor, thereby can not exert an influence to flash switch and Wiper motor.
Wiper motor is usually by top gear and bottom gear; for the running that can all can control Wiper motor under top gear and bottom gear and realize above-mentioned protection to Wiper motor; need at top gear and bottom gear, corresponding control circuit to be set respectively, it makes windshield wiper control circuit have comparatively complicated structure and higher cost.
In order be simultaneously to realize control and protection to the above-mentioned running of Wiper motor at bottom gear and top gear; rain brush speed selective relay also can be set; the two ends of the coil of this rain brush speed selective relay connect respectively anode and treater; described windshield wiper control circuit is provided with top gear supply line in parallel and bottom gear supply line between flash switch and Wiper motor, the open contact of relay and normally closed contact are linked into respectively in the top gear supply line and bottom gear supply line of Wiper motor.Export different control signals by treater, relay is switched between top gear and bottom gear, realize the control to the Wiper motor rotating speed.And because top gear and bottom gear have shared the original papers such as flash switch, lower edge switch, so it is simple in structure, cost is low.
Description of drawings
Fig. 1 is a kind of schematic diagram of existing windshield wiper control circuit.
Fig. 2 is the schematic diagram of a kind of windshield wiper control circuit of the present utility model.
Fig. 3 converts current signal to the schematic diagram of the current feedback circuit of voltage signal.
The specific embodiment
as Fig. 2, a kind of windshield wiper control circuit, be connected flash switch 2 between the input end of Wiper motor 1 and anode, be connected lower edge switch 3 between the input end of Wiper motor and ground, be in series with the diode 4 that flows to the base switch between flash switch and lower edge switch, the flash switch is connected with lower edge switch and is connected treater 5, treater output control signal, control switching and the switching degree of flash switch and lower edge switch, the flash switch also is integrated with the current feedback circuit 6 that can detect the Wiper motor electric current, current feedback circuit can convert current signal to voltage signal and be input in treater, make treater can judge the working condition of motor.
Windshield wiper control circuit also can comprise reverse connection prevention protection circuit 7; described reverse connection prevention protection circuit comprises a relay 70; one end of the coil 71 of this relay connects anode; the other end connects after backward diode 72 ground connection again, and the normally closed contact 73 of relay is connected between anode and flash switch.
As Fig. 3, described current feedback circuit 6 can comprise that a more parallel is at the resistance 61 of the current output terminal of ground and flash switch.Convert current signal to voltage signal by current flowing resistance.But the resistance two ends are parallel capacitance 62 also, by the interfering signal in the electric capacity filtering circuit.Higher at voltage, when exceeding the treater identification range, the more than one divider resistance 63 of can connecting between current output terminal and treater mouth.
As Fig. 2, windshield wiper control circuit also can comprise rain brush speed selective relay 8, the two ends of the coil 81 of rain brush speed selective relay connect respectively anode and treater, described windshield wiper control circuit is provided with in parallel top gear supply line 9 and bottom gear supply line 10 between flash switch and Wiper motor, the open contact 82 of relay and normally closed contact 83 are linked into respectively in the top gear supply line 9 and bottom gear supply line 10 of Wiper motor.
Claims (6)
1. windshield wiper control circuit, it is characterized in that: be connected the flash switch between the input end of Wiper motor and anode, be connected lower edge switch between the input end of Wiper motor and ground, be in series with the diode that flows to lower edge switch between flash switch and lower edge switch, the flash switch is connected with lower edge switch and is connected treater, treater output control signal, control switching and the switching degree of flash switch and lower edge switch, the flash switch also is integrated with the current feedback circuit that can detect the Wiper motor electric current, current feedback circuit can convert current signal to voltage signal and be input in treater, make treater can judge the working condition of motor.
2. windshield wiper control circuit as claimed in claim 1; it is characterized in that: windshield wiper control circuit also comprises reverse connection prevention protection circuit; described reverse connection prevention protection circuit comprises a relay; coil one end of this relay connects anode; the other end connects after backward diode ground connection again, and the normally closed contact of relay is connected between anode and flash switch.
3. windshield wiper control circuit as claimed in claim 1, it is characterized in that: windshield wiper control circuit also is provided with rain brush speed selective relay, the two ends of the coil of this rain brush speed selective relay connect respectively anode and treater, described windshield wiper control circuit is provided with top gear supply line in parallel and bottom gear supply line between flash switch and Wiper motor, the open contact of relay and normally closed contact are linked into respectively in the top gear supply line and bottom gear supply line of Wiper motor.
4. windshield wiper control circuit as claimed in claim 1, it is characterized in that: described current feedback circuit comprises that a more parallel is at the resistance of the current output terminal of ground and flash switch.
5. windshield wiper control circuit as claimed in claim 4 is characterized in that: but the two ends of described resistance parallel capacitance also.
6. windshield wiper control circuit as described in claim 4 or 5, is characterized in that: between current output terminal and treater mouth, be in series with more than one divider resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220444114.1U CN202944314U (en) | 2012-09-03 | 2012-09-03 | Windshield wiper control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220444114.1U CN202944314U (en) | 2012-09-03 | 2012-09-03 | Windshield wiper control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202944314U true CN202944314U (en) | 2013-05-22 |
Family
ID=48420027
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220444114.1U Expired - Lifetime CN202944314U (en) | 2012-09-03 | 2012-09-03 | Windshield wiper control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202944314U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110228448A (en) * | 2019-05-08 | 2019-09-13 | 上海禹点电子科技有限公司 | A kind of speed-adjusting and control system of windscreen wiper |
| CN111376868A (en) * | 2018-12-29 | 2020-07-07 | 联合汽车电子有限公司 | Wiper control circuit |
-
2012
- 2012-09-03 CN CN201220444114.1U patent/CN202944314U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111376868A (en) * | 2018-12-29 | 2020-07-07 | 联合汽车电子有限公司 | Wiper control circuit |
| CN110228448A (en) * | 2019-05-08 | 2019-09-13 | 上海禹点电子科技有限公司 | A kind of speed-adjusting and control system of windscreen wiper |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130522 |
|
| CX01 | Expiry of patent term |