CN212124989U - Automobile headlamp controller protection circuit - Google Patents
Automobile headlamp controller protection circuit Download PDFInfo
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- CN212124989U CN212124989U CN202020516040.2U CN202020516040U CN212124989U CN 212124989 U CN212124989 U CN 212124989U CN 202020516040 U CN202020516040 U CN 202020516040U CN 212124989 U CN212124989 U CN 212124989U
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Abstract
The utility model provides a vehicle headlamps controller protection circuit, including first variable resistance, second variable resistance, first amplifier and second amplifier, first variable resistance with the reverse input of first amplifier is connected and is connected with first resistance, second variable resistance with the reverse input of second amplifier is connected and is connected with the second resistance, and the arbitrary department in input position of amplifier or damage simultaneously open circuit can both make motor stall, protection vehicle control system.
Description
Technical Field
The utility model relates to an automotive headlamp control field especially relates to automotive headlamp controller protection circuit.
Background
In recent years, most automobiles are provided with a function for adjusting the headlight irradiation angle on the instrument panel by the driver. Some countries are regulating or promoting such regulations for adjusting the illumination angle of automotive headlamps. If the driver can adjust the irradiation angle of the head lamp during driving, the front view can be ensured according to the situation, and the view interference of the automobile driving in the reverse direction is reduced. However, when the control end for adjusting the angle of the headlight by cold welding or external impact is broken, the protection circuit is disabled, and thus the headlight irradiates an arbitrary direction, thereby increasing the risk of the vehicle driving in front.
As shown in fig. 1, the control method in the prior art: when the user turns down the adjustment button in order to adjust the angle of the headlamps on the dashboard in the automobile, the resistance of the PM1 variable resistor (101) on the controller changes. Although the voltage difference between points B and B 'is 0, the voltage at point a changes due to the variable resistor, and a voltage is generated between points B and B', so that io + current is generated at R1 (105). By the generated io + current, the motor (120) issues a rotation command and starts the motor, i.e., adjusts the angle of the headlamp (130). After the motor (120) rotates corresponding voltage difference, the voltage difference between B-B' generated by the change of the variable resistor returns to 0 again, and the motor (120) stops. Namely, the change control of the angle of the headlight (130) is completed, and the principle of the protection circuit is as follows: if the line between A and B is broken, no current is generated between A and B, and no current flows into the operational amplifier (110), so that the motor (120) is not driven. However, when the terminal B 'is disconnected, the voltage difference between B and B' cannot be returned to 0 after the motor adjusts the lower adjustable resistor, which causes the driving motor to move to a maximum point in a certain direction.
SUMMERY OF THE UTILITY MODEL
In order to solve the above technical problems, the utility model provides a protection circuit for a controller of an automobile headlamp, which comprises a first variable resistor, a second variable resistor, a first amplifier and a second amplifier,
the first variable resistor is connected with the reverse input end of the first amplifier and is connected with a first resistor, and the second variable resistor is connected with the reverse input end of the second amplifier and is connected with a second resistor;
the first amplifier is connected with the second amplifier, the current of the output ends of the first amplifier and the second amplifier is shunted after being converged and is connected with a motor, the motor is used for controlling a headlamp, and the motor is connected with the second variable resistor;
the output end current of the first amplifier is used for controlling the rotation of the motor.
Preferably, the output end of the first amplifier is connected with the inverting input end of the first amplifier, and forms a feedback circuit; the output end of the second amplifier is connected with the reverse input end of the second amplifier, the reverse input end of the first amplifier is connected with the same-direction input end of the second amplifier, and the same-direction input end of the second amplifier is connected with the reverse input end of the second amplifier.
Preferably, when the first resistor or the second resistor is disconnected, the output currents of the first amplifier and the second amplifier become 0, and the motor is stopped to be adjusted.
Preferably, when the first resistor and the second resistor are disconnected, the output currents of the first amplifier and the second amplifier become 0, and the motor is stopped to be adjusted.
A protection circuit for a headlight controller of an automobile comprises a first variable resistor, a second variable resistor and a double operational amplifier,
the first variable resistor is connected with the same-direction input end of the double operational amplifier and is connected with a first resistor, and the second variable resistor is connected with the reverse-direction input end of the double operational amplifier and is connected with a second resistor;
the first output end of the double operational amplifier is connected with the homodromous input end thereof, and the second output end of the double operational amplifier is connected with the homodromous input end thereof; the output end current of the double operational amplifier is used for controlling the rotation of the motor.
The utility model provides an automotive headlamp controller protection circuit has following beneficial effect: the motor can stop rotating to protect the automobile control system when the input end of the amplifier is damaged at any position or broken at the same time.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below.
FIG. 1 is a schematic diagram of a protection circuit of an illumination angle adjustment controller for an automotive headlamp in the prior art;
fig. 2 is a schematic diagram of a protection circuit of an illumination angle adjustment controller for an automotive headlamp in embodiment 1 of the present invention;
fig. 3 is a schematic diagram of the protection current of the controller of the present invention;
fig. 4 is a schematic diagram of the fault protection current of the controller of the present invention;
fig. 5 is a schematic diagram of a protection circuit of an illumination angle adjustment controller for an automotive headlamp in embodiment 2 of the present invention;
wherein, 1, a first variable resistor; 2. a second variable resistor; 3. a first resistor; 4. a second resistor; 5. a first amplifier; 6. a second amplifier; 7. a motor; 8. a dual operational amplifier; 9. a head lamp.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Example 1
As shown in fig. 2, the present invention provides a protection circuit for a headlamp controller of an automobile, comprising a first variable resistor 1, a second variable resistor 2, a first amplifier 5 and a second amplifier 6,
the first variable resistor 1 is connected with the inverting input end of the first amplifier 5 and is connected with a first resistor 3, and the second variable resistor 2 is connected with the inverting input end of the second amplifier 6 and is connected with a second resistor 4;
the first amplifier 5 is connected with the second amplifier 6, the output ends of the first amplifier 5 and the second amplifier 6 are shunted after current is merged, and a motor 7 is connected with the first amplifier 5 and the second amplifier 6, the motor 7 is used for controlling a headlamp 9, and the motor 7 is connected with the second variable resistor 2;
the output current of the first amplifier 5 is used to control the rotation of the motor 7.
The first amplifier 5 and the second amplifier 6 are connected in the following way: the output end of the first amplifier 5 is connected with the inverting input end of the first amplifier 5, and forms a feedback circuit; the output end of the second amplifier 6 is connected with the inverting input end of the second amplifier 6, the inverting input end of the first amplifier 5 is connected with the inverting input end of the second amplifier 6, and the inverting input end of the second amplifier 6 is connected with the inverting input end of the second amplifier 6. The principle is as follows:
as shown in fig. 2, even if one of the two amplifier input lines is disconnected, the entire system regulator variable resistor R1 is protected from being pulled up to adjust the potential at point a, and electricity (io +) is generated at point R1 according to the voltage difference between points B and flows into the direction of the first amplifier 5. And as shown in connection with fig. 3, the current direction of io + can be seen. At this time, the current io + is calculated as follows: io + (VA-VB)/R1
B. The voltage of B' is almost the same according to the feedback loop, and depends on the amplification gain Gm of the amplifier. That is, the larger Gm is, the smaller the potential difference at the input terminal should be, and the potential difference between B and B' should be almost zero.
Namely: VB-VB' ≈ 0
Similarly, resistor R2 also generates a current io-based on the voltage difference between A 'and B', in a direction opposite to the previous io +, and flows from the amplifier.
io-＝(VA’-VB’)/R2
The voltage difference VA-VA 'between A and A' in FIG. 2 is shown below.
VA-VA'＝R1*io++R2*io-
If R1 ═ R2, io + ═ io-, VA-VA' ═ 2R ═ io.
In the above formula, the io size is proportional to the VA-VA' size. The io + and io-flow to the direction of the motor 7, completing the forward rotation, reverse rotation and stop motion of the motor. Therefore, the rotation and stop and the rotation direction of the motor 7 are determined according to the current magnitude and current direction of io + and io-. Since the magnitude of VA-VA' is determined by the external resistors R1 and R2 of the first amplifier 5 and the second amplifier 6, the user can select an appropriate resistance value and control the motor 7 by a desired signal level (current value).
The outputs io + and io-of the first amplifier 5 and the second amplifier 6 are combined and then separated, and are supplied to the front end of the drive motor 7. Here it is the current proportional to io + and io-. As a result, the IC pin inputs completing the overall protection circuit mechanism become B, B', the resistors R1 and R2 become external elements, and the final signal it for controlling the motor 7 becomes a signal proportional to the current flowing through R1 and R2. This can improve user convenience by adjusting the resistance and adjusting the motor 7 outside the IC and then adjusting the angle of illumination of the vehicle headlamp 9, depending on the application the user desires to use. As shown in fig. 2, even if one of the protection line input wires is broken, the operation of the motor 7 is stopped, which is particularly important for protecting the safety of the driver and the automobile system.
Then a disconnection accident may occur at the positions of the first resistance 3 and the second resistance 4 as shown in fig. 4. At which of points P, Q, R, S an accident may occur. According to an embodiment of the present invention, even if an accident occurs at a plurality of points P, Q, R, S, the irradiation angle controller of the vehicle headlamp 9 is not randomly adjusted, and the motor 7 is stopped.
As shown in fig. 4, when a disconnection occurs between the variable resistor PM1 and the resistor R1 or between R1 and the inverting input terminal B of the first amplifier 5, the voltage VB at the point B is made the same as the voltage VB 'at the point B' by the amplification gain Gm1 of the first amplifier 5. If VB is the same as VB', io + ═ io ═ 0[ a ], the current flowing into the motor 7 also becomes "0", and the motor 7 stops operating.
If a disconnection occurs between the variable resistor PM2 and the inverting input terminal B' of the second amplifier 6, the voltage is passed
The amplification gain Gm2 of the second amplifier 6 makes the B 'voltage B' the same as the voltage VB at the point B. Therefore, if VB is the same as VB', io ═ io + ═ 0[ a ], the current flowing into the motor 7 also becomes "0", and the motor 7 stops operating.
By the mode, no matter the same-direction input end or the reverse-direction input end is disconnected, the driving signal of the motor 7 is changed into io < + > -io < - > -0 [ A ], the motor 7 stops running, and the system is protected.
Example 2
In this embodiment, the two first amplifier 5 and the second amplifier 6 connected to each other in embodiment 1 are replaced with one amplifier using + and-outputs, and the other external components are the same. This amplifier with 2 outputs is the most typical device by LTC 6362 model of Linear Technology. The connection mode of the dual operational amplifier 8 is as follows: as shown in fig. 5, a first output terminal of the dual operational amplifier 8 is connected to a unidirectional input terminal thereof, and a second output terminal of the dual operational amplifier 8 is connected to a unidirectional input terminal thereof; the output current of the dual operational amplifier 8 is used to control the rotation of the motor 7.
When a disconnection occurs between the first variable resistor 1 and the first resistor 3 or between the first resistor 3 and the non-inverting input terminal B of the dual operational amplifier 8, the voltage VB at the point B is made the same as the voltage VB 'at the point B' by the amplification gain Gm of the dual operational amplifier 8. If VB is the same as VB', io + ═ io ═ 0[ a ], the current flowing into the motor 7 also becomes "0", and the motor 7 stops operating.
If a disconnection occurs between the second variable resistor 2 and the inverting input terminal B 'of the dual operational amplifier 8, the voltage VB' at the point B 'is made the same as the voltage VB at the point B' by the amplification gain Gm of the dual operational amplifier 8. If VB is the same as VB', io ═ io + ═ 0[ a ], the current flowing into the motor 7 also becomes "0", and the motor 7 similarly stops operating.
Finally, when a disconnection occurs between the first variable resistors 1 and B and/or between the second variable resistors 2 and B', in either case, the driving signal of the motor 7 becomes io ═ 0[ a ], the motor 7 stops operating, and the system is protected.
Various modifications to the embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. A protection circuit of a controller of an automobile headlamp is characterized by comprising a first variable resistor, a second variable resistor, a first amplifier and a second amplifier,
the first variable resistor is connected with the reverse input end of the first amplifier and is connected with a first resistor, and the second variable resistor is connected with the reverse input end of the second amplifier and is connected with a second resistor;
the first amplifier is connected with the second amplifier, the current of the output ends of the first amplifier and the second amplifier is shunted after being converged and is connected with a motor, the motor is used for controlling a headlamp, and the motor is connected with the second variable resistor;
the output end current of the first amplifier is used for controlling the rotation of the motor.
2. The vehicle headlamp controller protection circuit according to claim 1, wherein an output terminal of the first amplifier is connected to an inverting input terminal of the first amplifier and forms a feedback circuit; the output end of the second amplifier is connected with the reverse input end of the second amplifier, the reverse input end of the first amplifier is connected with the same-direction input end of the second amplifier, and the same-direction input end of the second amplifier is connected with the reverse input end of the second amplifier.
3. The vehicle headlamp controller protecting circuit according to claim 1 or 2, wherein when an open circuit occurs at the first resistor or the second resistor, the output currents of the first amplifier and the second amplifier become 0, and the adjustment of the motor is stopped.
4. The vehicle headlamp controller protecting circuit according to claim 1 or 2, wherein when an open circuit occurs at the first resistor and the second resistor, the output current of the first amplifier and the second amplifier becomes 0, and the adjustment of the motor is stopped.
5. A protection circuit for a headlamp controller of an automobile is characterized by comprising a first variable resistor, a second variable resistor and a double operational amplifier,
the first variable resistor is connected with the same-direction input end of the double operational amplifier and is connected with a first resistor, and the second variable resistor is connected with the reverse-direction input end of the double operational amplifier and is connected with a second resistor;
the first output end of the double operational amplifier is connected with the homodromous input end thereof, and the second output end of the double operational amplifier is connected with the homodromous input end thereof; the output end current of the double operational amplifier is used for controlling the rotation of the motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020516040.2U CN212124989U (en) | 2020-04-10 | 2020-04-10 | Automobile headlamp controller protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020516040.2U CN212124989U (en) | 2020-04-10 | 2020-04-10 | Automobile headlamp controller protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212124989U true CN212124989U (en) | 2020-12-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020516040.2U Active CN212124989U (en) | 2020-04-10 | 2020-04-10 | Automobile headlamp controller protection circuit |
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|---|---|
| CN (1) | CN212124989U (en) |
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2020
- 2020-04-10 CN CN202020516040.2U patent/CN212124989U/en active Active
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Address after: Room 201, building 1, No. 62, Lane 99, Chunguang Road, Minhang District, Shanghai Patentee after: Shanghai Tamu Semiconductor Technology Co.,Ltd. Address before: 210000 506-508, block B, Kechuang Plaza, Nanjing area, Jiangsu Free Trade Zone, No. 320, pubin Road, Pukou District, Nanjing, Jiangsu Province Patentee before: Nanjing Tamu Semiconductor Technology Co.,Ltd. |
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