CN201800680U - Direct current windshield wiper control circuit - Google Patents
Direct current windshield wiper control circuit Download PDFInfo
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- CN201800680U CN201800680U CN201020532174XU CN201020532174U CN201800680U CN 201800680 U CN201800680 U CN 201800680U CN 201020532174X U CN201020532174X U CN 201020532174XU CN 201020532174 U CN201020532174 U CN 201020532174U CN 201800680 U CN201800680 U CN 201800680U
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Abstract
The utility model relates to a direct current (DC) windshield wiper control circuit, which is mainly characterized by consisting of a switch level signal detecting circuit, a logic level hold circuit, an automatic windshield wiper reset circuit, a positive and negative logic control circuit and a DC motor driving circuit which are connected, wherein the switch level signal detecting circuit is respectively connected to the input ends of the logic level hold circuit and the automatic windshield wiper reset circuit, the output end of the logic level hold circuit is connected with the input end of the positive and negative logic control circuit, the two output ends of the positive and negative logic control circuit are respectively connected to the two input ends of the DC motor driving circuit, the two output ends of the DC motor driving circuit are connected with a DC motor, and the automatic windshield wiper reset circuit is connected with the positive and negative logic control circuit. The circuit has simple structure, reduces the complexity of the control system, saves the design cost of the control circuit, enhances the working performance of the system, reduces noise generated in operation and ensures the operation reliability of the control circuit.
Description
Technical field
The utility model belongs to field of video monitoring, especially a kind of direct current rain brush control circuit.
Background technology
In field of video monitoring, the other installation rain brush that often needs in the form position of camera protective cover.It is to solve because the problem that the camera protective cover form that rainwater or sand and dust cause blurs or blocks photographic effect that the rain brush main purpose is installed.Traditional rain brush controller mainly adopts the Single-chip Controlling mode to carry out logical signal control, or adopt the relay switching mode to carry out the Wiper motor motion control, it exists mainly that the control circuit design cost is higher, the control relative complex, can produce bigger signal disturb when using the relay switching mode to carry out Wiper motor control, and relay can frequently send adhesive and the shortcoming that disconnects the sound that is produced.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of direct current rain brush control circuit that reduces complexity, saving circuit layout cost, the enhanced system serviceability of control system and can reduce noise is provided.
The utility model solves its technical matters and takes following technical scheme to realize:
A kind of direct current rain brush control circuit, by the switch level signal deteching circuit, the logic level lock-out circuit, the rain brush automatic reset circuit, mixed logic control circuit and direct current motor drive circuit connect and compose, the switch level signal deteching circuit is connected respectively to the input end of logic level lock-out circuit and rain brush automatic reset circuit, the mouth of logic level lock-out circuit is connected with the input end of mixed logic control circuit, two mouths of mixed logic control circuit are connected respectively to two input ends of direct current motor drive circuit, two mouths of direct current motor drive circuit are connected with DC machine, and the rain brush automatic reset circuit is connected with the mixed logic control circuit.
And, described switch level signal deteching circuit is connected and composed by left limit switch S 1, right limit switch S 2 and master cock S3, wherein, the circuit structure of left limit switch S 1 is: voltage end VCC is connected to two input ends of NAND gate U1A respectively by resistance R 2, resistance R 3, resistance R 2 also is connected with an end of left limit switch S 1, the first input end of NAND gate U1C, the other end ground connection of left limit switch S 1; The circuit structure of right limit switch S 2 is: voltage end VCC is connected to two input ends of NAND gate U1B respectively by resistance R 4, resistance R 5, resistance R 5 also is connected with an end of right limit switch S 2, the other end ground connection of right limit switch S 2; The circuit structure of master cock S3 is: voltage end VCC is connected respectively to the end of master cock S3, second input end of NAND gate U1C, second input end of NAND gate U1D, the other end ground connection of master cock S3 by resistance R 11.
And, the circuit structure of described logic level lock-out circuit is connected and composed by NAND gate U1A, NAND gate U1B and rest-set flip-flop, the mouth of NAND gate U1A, the mouth of NAND gate U1B are connected with two input ends of rest-set flip-flop respectively, the mouth of rest-set flip-flop is connected with the input end of mixed logic control circuit, and described rest-set flip-flop is connected and composed by joint denial gate U2A, joint denial gate U2B.
And, described mixed logic control circuit is connected and composed by resistance R 1, resistance R 4, aerotron Q1, resistance R 7, resistance R 8, aerotron Q2 and joint denial gate U2C, resistance R 4 one ends are connected with the mouth of logic level lock-out circuit, the other end of resistance R 4 connects the base stage of aerotron Q1, the collecting electrode of aerotron Q1 connects resistance R 1 one ends and direct current motor drive circuit positive input simultaneously, the other end of resistance R 1 is connected with voltage end VCC, the grounded emitter of aerotron Q1; The input end of joint denial gate U2C is connected with the mouth of logic level lock-out circuit, another input end grounding of joint denial gate U2C, the mouth of joint denial gate U2C is connected by the base stage of resistance R 8 with aerotron Q2, the collecting electrode of aerotron Q2 is connected to an end and the direct current motor drive circuit reverse input end of resistance R 7 simultaneously, the other end of resistance R 7 is connected with voltage end VCC, the grounded emitter of aerotron Q2.
And described aerotron Q1 and aerotron Q2 are NPN type aerotron.
And, described rain brush automatic reset electro route NAND gate U1C, NAND gate U1D, joint denial gate U2D, resistance R 9, aerotron Q3, resistance R 10 and aerotron Q4 connect and compose, the mouth of NAND gate U1C is connected with the first input end of NAND gate U1D, the mouth of NAND gate U1D connects the input end of joint denial gate U2D, another input end grounding of joint denial gate U2D, the mouth of joint denial gate U2D is respectively by resistance R 9, resistance R 10 connects aerotron Q3, the base stage of aerotron Q4, aerotron Q3, the collecting electrode of aerotron Q4 respectively with aerotron Q2, the base stage of aerotron Q1 is connected, aerotron Q3, the emitter of aerotron Q4 is ground connection respectively.
And described aerotron Q3 and aerotron Q4 are NPN type aerotron.
And described direct current motor drive circuit adopts motor drive module BD6220.
Advantage of the present utility model and good effect are:
1, this control circuit is made of minority electrons element with low cost, by logic level rain brush motion carrying out system is controlled, reduced system's control difficulty effectively, improved the serviceability of system, shorten Products Development cycle and design cost simultaneously, guaranteed the reliability of control circuit.
2, this control circuit can adopt little encapsulation type electronic component to realize, can effectively dwindle the area of control circuit board, reduced the volume of rain brush controller, and control circuit is simple in structure, practical, and can carries out flexible design according to the practical application needs.
3, the utility model circuit structure is simple, has reduced the complexity of control system, the design cost of saving control circuit, the noise that has strengthened the system works performance, produced when having reduced operation, has guaranteed the control circuit reliability of operation.
Description of drawings
Fig. 1 is a circuit diagram of the present utility model.
The specific embodiment
Below in conjunction with accompanying drawing the utility model embodiment is further described:
A kind of direct current rain brush control circuit as shown in Figure 1, is connected and composed by switch level signal deteching circuit, logic level lock-out circuit, rain brush automatic reset circuit, mixed logic control circuit, direct current motor drive circuit.The switch level signal deteching circuit is connected respectively to the input end of logic level lock-out circuit and rain brush automatic reset circuit, the mouth of logic level lock-out circuit is connected with the input end of mixed logic control circuit, two mouths of mixed logic control circuit are connected respectively to two input ends of direct current motor drive circuit, two mouths of direct current motor drive circuit are connected with DC machine, and the rain brush automatic reset circuit also is connected with the mixed logic control circuit.Realize the round control of Wiper motor and the rain brush functions such as control that automatically reset by above-mentioned control circuit.
Each component part to control circuit is described in detail below:
The switch level signal deteching circuit is connected and composed by following three Switch devices: be used as left limit switch S 1, right limit switch S 2 in the rain brush movement travel and the master cock S3 that imports as the switch state signal of the open and close of controlling Wiper system.The circuit structure of left limit switch S 1 is: voltage end VCC is connected to two input ends of the NAND gate U1A in the logic level lock-out circuit respectively by resistance R 2, resistance R 3, resistance R 2 also is connected the other end ground connection of left limit switch S 1 with an end of left limit switch S 1, the first input end of NAND gate U1C in the rain brush automatic reset circuit; Left limit switch S 1 act as: for: when left limit switch S 1 was in open mode, the 2nd pin of U1A was drawn high level by VCC and resistance R 2; When left limit switch S 1 was in closure state, the 2nd pin of U1A was forced to the drop-down low level that is.The circuit structure of right limit switch S 2 is: voltage end VCC is connected to two input ends of the NAND gate U1B in the logic level lock-out circuit respectively by resistance R 4, resistance R 5, resistance R 5 also is connected with an end of right limit switch S 2, the other end ground connection of right limit switch S 2, the conduct of right limit switch S 2: when right limit switch S 2 was in open mode, the 5th pin of U1B was drawn high level by VCC and resistance R 5; When right limit switch S 2 was in closure state, the 5th pin of U1B was forced to the drop-down low level that is.The circuit structure of master cock S3 is: voltage end VCC is connected respectively to the end of master cock S3, second input end of NAND gate U1C, second input end of NAND gate U1D by resistance R 11, the other end ground connection of master cock S3, master cock S3 act as: when master cock S3 was in open mode, the 10th pin of U1C and the 13rd pin of U1D were drawn high level by VCC and resistance R 11; When master cock S3 was in closure state, the 10th pin of U1C and the 13rd pin of U1D were forced to the drop-down low level that is.
The circuit structure of logic level lock-out circuit shown in the frame of broken lines among Fig. 11, is connected and composed by NAND gate U1A, NAND gate U1B, joint denial gate U2A and joint denial gate U2B, and wherein joint denial gate U2A AND OR NOT gate U2B is connected to form rest-set flip-flop.The concrete annexation of logic level lock-out circuit is: the mouth of NAND gate U1A, the mouth of NAND gate U1B are connected with two input ends of rest-set flip-flop respectively, and the mouth of rest-set flip-flop is connected with the input end of mixed logic control circuit.
The structure of mixed logic control circuit, shown in the frame of broken lines among Fig. 12, connect and compose by resistance R 1, resistance R 4, NPN type aerotron Q1, resistance R 7, resistance R 8, NPN type aerotron Q2 and joint denial gate U2C, be used to control forward and reverse sense of motion of Wiper motor.The concrete annexation of mixed logic control circuit is: the mouth of logic level lock-out circuit connects the base stage of NPN type aerotron Q1 by resistance R 4, the collecting electrode of this NPN type aerotron Q1 connects the positive input of resistance R 1 one ends and motor drive module BD6220 chip simultaneously, the other end of resistance R 1 is connected with voltage end VCC, the grounded emitter of this NPN type aerotron Q1; The mouth of logic level lock-out circuit also connects the input end of joint denial gate U2C, another input end grounding of this joint denial gate U2C, the mouth of this joint denial gate U2C is connected by the base stage of resistance R 8 with NPN type aerotron Q2, the collecting electrode of this NPN type aerotron Q2 is connected to an end of resistance R 7 and the reverse input end of motor drive module BD6220 chip simultaneously, the other end of this resistance R 7 is connected with voltage end VCC, the grounded emitter of this NPN type aerotron Q2.
The structure of rain brush automatic reset circuit shown in the frame of broken lines among Fig. 13, is connected and composed by NAND gate U1C, NAND gate U1D, joint denial gate U2D, resistance R 9, NPN type aerotron Q3, resistance R 10 and NPN type aerotron Q4.The concrete annexation of rain brush automatic reset circuit is: the mouth of NAND gate U1C is connected with the first input end of NAND gate U1D, the mouth of NAND gate U1D connects the input end of joint denial gate U2D, another input end grounding of this joint denial gate U2D, the mouth of this joint denial gate U2D is respectively by resistance R 9, resistance R 10 connects NPN type aerotron Q3, the base stage of NPN type aerotron Q4, NPN type aerotron Q3, the collecting electrode of NPN type aerotron Q4 respectively with NPN type aerotron Q2, the base stage of NPN type aerotron Q1 is connected, NPN type aerotron Q3, the emitter of NPN type aerotron Q4 is ground connection respectively.
Direct current motor drive circuit adopts motor drive module BD6220 (U3) to realize, its positive input is connected with two mouths of mixed logic control circuit respectively with reverse input end, two mouths of motor drive module BD6220 (U3) are connected with DC machine B1 respectively, direct current motor drive circuit drives DC machine B1 work under the control of mixed logic control circuit, DC machine B1 drives the rain brush back and forth movement.
In the present embodiment, NAND gate U1A, the NAND gate U1B that the each part mentioned above circuit is adopted, NAND gate U1C, NAND gate U1D all adopt a group of two input ends, four NAND gate IC chips, and joint denial gate U2A, joint denial gate U2B, joint denial gate U2C, joint denial gate U2D all adopt a group in the two input end four nor gate IC chips.
The principle of work of this direct current rain brush control circuit is:
When rain brush is in the optional position (the rain brush movement travel is smaller or equal to the anglec of rotation between S1 and the S2), after system power-up, can analyze by following two kinds of situations:
First kind of situation: S3 is in off-state.
(1) rain brush is switched on the front position in the S1 position, and impels S1 to be in closure state.After the energising of rain brush control system, the rain brush transfixion.
(2) rain brush energising front position is not in the S1 position, and S1 is in off-state, and S2 is in free position.After the energising of rain brush control system, rain brush begins to the rotation of S1 place direction, and when rain brush rotated to S1 and impel S1 to become closure state, rain brush stopped operating, and keeps quiescence.
(3) when S3 becomes closure state by off-state, rain brush begins to rotate to the S2 direction.Impel S2 to become closure state by off-state when rain brush rotates to the S2 position, rain brush stops operating and changes hand of rotation at this moment, and beginning is rotated to the S1 direction.Impel S1 to become closure state by off-state when rain brush rotates to the S1 position, rain brush stops operating and changes hand of rotation at this moment.This rear windscreen wiper carries out back and forth movement between S1 and S2.When S3 became off-state by closure, rain brush stopped and after the S1 direction turned to the S1 position and impels S1 to be in closure state, rain brush stopped operating and keeps quiescence.
Second kind of situation: S3 is in closure state.
(1) rain brush is switched on the front position in the S1 position, and impels S1 to be in closure state.Rain brush begins to the rotation of S2 direction, and when rain brush rotated to the S2 position and impels S2 to be in closure state, rain brush stopped operating and begins and rotates to the S1 direction.When rain brush rotated to the S1 position and impels S1 to be in closure state, rain brush stopped operating and begins to the rotation of S2 direction, and this rear windscreen wiper carries out back and forth movement between S1 and S2.When S3 became off-state by closure state, rain brush stopped operating and begins to the motion of S1 direction, and rain brush stops operating when rotating to the S1 position, and keeps quiescence.
(2) rain brush energising front position is not in the S1 position, and S1 is in off-state, and S2 is in free position.After the energising of rain brush control system, rain brush rotates to the S1 direction earlier.When rain brush rotates to the S1 position and impels S1 to become closure state by off-state, rain brush stops operating and begins and rotates to the S2 direction.When rain brush rotated to S2 and impel S2 to be in closure state, rain brush stopped operating and begins and rotates to the S1 direction.This rear windscreen wiper carries out back and forth movement between S1 and S2.When S3 became off-state by closure state, rain brush stopped operating and begins to the motion of S1 direction, and rain brush stops operating when rotating to the S1 position, and keeps quiescence.
Below the work-based logic signal of this direct current rain brush control circuit is analyzed:
1, as S1, S2, when S3 is in off-state, U1A the 1st pin logical signal is that 1, the 2 leg signal is that 1, the 3 leg signal is 0; U1B the 4th pin logical signal is that 1, the 5 leg signal is that 1, the 6 leg signal is 0; U2A the 1st pin logical signal is 1, and U2C the 8th pin signal is 1, is 0 through making U2C the 10th pin signal behind the U2C.U1A the 2nd leg signal is 1, U1C the 10th leg signal is 1, and making U1C the 8th leg signal is 0, thereby U1D the 12nd leg signal is 0, U1D the 13rd leg signal is 1, U1D the 11st pin signal is 1, and U2D the 12nd pin signal is 1, and U2D the 11st pin signal is 0, U2D the 13rd pin signal is 0, so Q3 and Q4 are in off condition, the state of Q1 is by the 1st pin decision of U2A, and the state of Q2 is determined by U2C the 10th pin; The 1st pin of U2A is opposite with the logic level of the 10th pin of U2C, makes Q1 opposite with the collecting electrode outgoing level of Q2, and the 4th pin of U3 is opposite with the 5th pin level, can control the rotating campaign of motor, and rain brush is rotated to the S1 direction.
When rain brush rotates to S1 and impel S1 to be in closure state, U1C the 9th pin signal is 0, U1C the 8th pin signal is 1, U1D the 12nd pin signal is 1, and U1D the 13rd pin signal is 1, and U1D the 11st pin signal is 0, the 13rd pin signal of U2D is 1, Q3, Q4 conducting make Q1, Q2 become off condition, and the 4th pin of U3 and the 5th pin signal are 1, and motor stops operating.
May determine according to above-mentioned logical signal analysis that 2, when S3 was in off-state, if S1, S2 are in off-state, rain brush will become closure state until S1 to the S1 motion, motor stops operating.
When S3 was in closure state, rain brush carried out the back and forth movement to S2 by S1.When S3 became off-state by closure, motor stopped operating earlier, began rotation to S1 then, stopped at the S1 position at last, and impelled S1 to be in closure state, and this moment, the rain brush homing action was finished.
It is emphasized that; embodiment described in the utility model is illustrative; rather than it is determinate; therefore the utility model is not limited to the embodiment described in the specific embodiment; every by those skilled in the art according to other embodiments that the technical solution of the utility model draws, belong to the scope of the utility model protection equally.
Claims (8)
1. direct current rain brush control circuit, it is characterized in that: by the switch level signal deteching circuit, the logic level lock-out circuit, the rain brush automatic reset circuit, mixed logic control circuit and direct current motor drive circuit connect and compose, the switch level signal deteching circuit is connected respectively to the input end of logic level lock-out circuit and rain brush automatic reset circuit, the mouth of logic level lock-out circuit is connected with the input end of mixed logic control circuit, two mouths of mixed logic control circuit are connected respectively to two input ends of direct current motor drive circuit, two mouths of direct current motor drive circuit are connected with DC machine, and the rain brush automatic reset circuit is connected with the mixed logic control circuit.
2. a kind of direct current rain brush control circuit according to claim 1, it is characterized in that: described switch level signal deteching circuit is connected and composed by left limit switch S 1, right limit switch S 2 and master cock S3, wherein, the circuit structure of left limit switch S 1 is: voltage end VCC is connected to two input ends of NAND gate U1A respectively by resistance R 2, resistance R 3, resistance R 2 also is connected with an end of left limit switch S 1, the first input end of NAND gate U1C, the other end ground connection of left limit switch S 1; The circuit structure of right limit switch S 2 is: voltage end VCC is connected to two input ends of NAND gate U1B respectively by resistance R 4, resistance R 5, resistance R 5 also is connected with an end of right limit switch S 2, the other end ground connection of right limit switch S 2; The circuit structure of master cock S3 is: voltage end VCC is connected respectively to the end of master cock S3, second input end of NAND gate U1C, second input end of NAND gate U1D, the other end ground connection of master cock S3 by resistance R 11.
3. a kind of direct current rain brush control circuit according to claim 1 and 2, it is characterized in that: the circuit structure of described logic level lock-out circuit is connected and composed by NAND gate U1A, NAND gate U1B and rest-set flip-flop, the mouth of NAND gate U1A, the mouth of NAND gate U1B are connected with two input ends of rest-set flip-flop respectively, the mouth of rest-set flip-flop is connected with the input end of mixed logic control circuit, and described rest-set flip-flop is connected and composed by joint denial gate U2A, joint denial gate U2B.
4. a kind of direct current rain brush control circuit according to claim 1 and 2, it is characterized in that: described mixed logic control circuit is connected and composed by resistance R 1, resistance R 4, aerotron Q1, resistance R 7, resistance R 8, aerotron Q2 and joint denial gate U2C, resistance R 4 one ends are connected with the mouth of logic level lock-out circuit, the other end of resistance R 4 connects the base stage of aerotron Q1, the collecting electrode of aerotron Q1 connects resistance R 1 one ends and direct current motor drive circuit positive input simultaneously, the other end of resistance R 1 is connected with voltage end VCC, the grounded emitter of aerotron Q1; The input end of joint denial gate U2C is connected with the mouth of logic level lock-out circuit, another input end grounding of joint denial gate U2C, the mouth of joint denial gate U2C is connected by the base stage of resistance R 8 with aerotron Q2, the collecting electrode of aerotron Q2 is connected to an end and the direct current motor drive circuit reverse input end of resistance R 7 simultaneously, the other end of resistance R 7 is connected with voltage end VCC, the grounded emitter of aerotron Q2.
5. a kind of direct current rain brush control circuit according to claim 4, it is characterized in that: described aerotron Q1 and aerotron Q2 are NPN type aerotron.
6. a kind of direct current rain brush control circuit according to claim 1 and 2, it is characterized in that: described rain brush automatic reset electro route NAND gate U1C, NAND gate U1D, joint denial gate U2D, resistance R 9, aerotron Q3, resistance R 10 and aerotron Q4 connect and compose, the mouth of NAND gate U1C is connected with the first input end of NAND gate U1D, the mouth of NAND gate U1D connects the input end of joint denial gate U2D, another input end grounding of joint denial gate U2D, the mouth of joint denial gate U2D is respectively by resistance R 9, resistance R 10 connects aerotron Q3, the base stage of aerotron Q4, aerotron Q3, the collecting electrode of aerotron Q4 respectively with aerotron Q2, the base stage of aerotron Q1 is connected, aerotron Q3, the emitter of aerotron Q4 is ground connection respectively.
7. a kind of direct current rain brush control circuit according to claim 6, it is characterized in that: described aerotron Q3 and aerotron Q4 are NPN type aerotron.
8. a kind of direct current rain brush control circuit according to claim 1 and 2 is characterized in that: described direct current motor drive circuit adopts motor drive module BD6220.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020532174XU CN201800680U (en) | 2010-09-17 | 2010-09-17 | Direct current windshield wiper control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020532174XU CN201800680U (en) | 2010-09-17 | 2010-09-17 | Direct current windshield wiper control circuit |
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| Publication Number | Publication Date |
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| CN201800680U true CN201800680U (en) | 2011-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201020532174XU Expired - Fee Related CN201800680U (en) | 2010-09-17 | 2010-09-17 | Direct current windshield wiper control circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022188380A1 (en) * | 2021-03-12 | 2022-09-15 | Siemens Shanghai Medical Equipment Ltd. | Motor control circuit and medical device |
-
2010
- 2010-09-17 CN CN201020532174XU patent/CN201800680U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022188380A1 (en) * | 2021-03-12 | 2022-09-15 | Siemens Shanghai Medical Equipment Ltd. | Motor control circuit and medical device |
| US12438484B2 (en) | 2021-03-12 | 2025-10-07 | Siemens Shanghai Medical Equipment Ltd. | Motor control circuit and medical device |
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Owner name: TIANJIN YA AN TECHNOLOGY CO., LTD. Free format text: FORMER NAME: YAAN SCIENCE + TECHNOLOGY ELECTRONIC CO., LTD., TIANJIN |
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| CP03 | Change of name, title or address |
Address after: 300384 Tianjin City Huayuan Industrial Zone Ziyuan Road No. 8 Patentee after: Tianjin Yaan Technology Co., Ltd. Address before: Zi Yuan Road 300384 Tianjin city Nankai District Huayuan Industrial Park No. 8 Patentee before: Yaan Science & Technology Electronic Co., Ltd., Tianjin |
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| CF01 | Termination of patent right due to non-payment of annual fee |
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| EXPY | Termination of patent right or utility model |