CN219576641U - Head-up display system, protection circuit thereof and automobile driving system - Google Patents
Head-up display system, protection circuit thereof and automobile driving system Download PDFInfo
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- CN219576641U CN219576641U CN202320328075.7U CN202320328075U CN219576641U CN 219576641 U CN219576641 U CN 219576641U CN 202320328075 U CN202320328075 U CN 202320328075U CN 219576641 U CN219576641 U CN 219576641U
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Abstract
The utility model discloses a head-up display system, a protection circuit thereof and an automobile driving system, wherein the protection circuit of the head-up display system is used for protecting a voltage detection port of a processor of a head-up display, and comprises the following components: an anti-surge diode connected with a power supply of the head-up display; an anti-static diode connected with the anti-surge diode; and one end of the bidirectional diode is connected with the antistatic diode, and the other end of the bidirectional diode is connected with a voltage detection port of a processor of the head-up display. The utility model can ensure the normal operation of the head-up display.
Description
Technical Field
The utility model relates to the technical field of head-up display systems, in particular to a protection circuit of a head-up display system.
Background
HUDs (head-up displays), also called heads-up displays, have become increasingly popular in automobiles today. The HUD aims to improve the safety of the automobile, so that the attention of a driver is focused on the road surface, and accidents are reduced.
HUD products typically need to be mounted inside the vehicle's instrument desk and form a virtual projection image by using the front windshield ratio of the vehicle as one of the imaging elements. When the HUD product works on the vehicle, because the electric equipment in the vehicle is many, the electric equipment in the vehicle inevitably produces the interference to the whole vehicle battery voltage, and the battery voltage stable to the HUD product collection brings the risk of error and circuit potential failure.
Disclosure of Invention
In view of the above, it is necessary to provide a head-up display system, a protection circuit thereof, and an automobile driving system.
A head-up display system protection circuit is used for protecting a head-up display;
the head-up display system protection circuit includes:
an anti-surge diode connected with a power supply of the head-up display;
an anti-static diode connected with the anti-surge diode;
and one end of the bidirectional diode is connected with the antistatic diode, and the other end of the bidirectional diode is connected with a voltage detection port of a processor of the head-up display.
Wherein, the head-up display system protection circuit further includes:
and the voltage dividing circuit is connected between the antistatic diode and the bidirectional diode and is used for reducing the voltage input into the processor of the visual display to a preset range.
Wherein the preset range includes 0V to 3.3V.
Wherein the voltage range of the power output of the head-up display includes 9V to 16V.
Wherein, the head-up display system protection circuit further includes:
and the filter circuit is connected between the anti-surge diode and the bidirectional diode.
Wherein the filter circuit includes:
and the high-pass filter circuit is connected between the anti-surge diode and the bidirectional diode.
Wherein the filter circuit further comprises:
and the low-pass filter circuit is connected between the anti-surge diode and the bidirectional diode.
The voltage detection port is an analog-to-digital conversion input/output port of the processor.
A heads-up display system comprising a heads-up display system protection circuit as described above.
An automotive driving system comprising a heads-up display system as described above.
The embodiment of the utility model has the following beneficial effects:
the anti-surge diode in the head-up display system protection circuit can effectively prevent transient pulses from protecting the voltage detection port of the MCU of the head-up display, the anti-static diode can protect the voltage detection port of the MCU of the head-up display from being damaged by lightning stroke, electrostatic discharge and other fast transient voltages, the bidirectional diode can conduct overvoltage protection on the voltage detection port of the MCU of the head-up display, and therefore the MCU of the head-up display can acquire stable voltage and ensure that the head-up display can work normally.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Wherein:
FIG. 1 is a schematic diagram of a first embodiment of a head-up display system protection circuit according to the present utility model;
fig. 2 is a schematic structural diagram of a second embodiment of a protection circuit of a head-up display system according to the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a first embodiment of a protection circuit of a head-up display system according to the present utility model. The head-up display system protection circuit 10 is used for protecting a voltage detection port of a processor of a head-up display, and an anti-surge diode 11, an anti-static diode 12 and a bidirectional diode 13 are arranged between a power supply 21 of the head-up display and a voltage detection port 22 of the processor of the head-up display. The voltage detection port of the processor of the head-up display is provided with triple protection by an anti-surge diode 11, an anti-static diode 12 and a bi-directional diode 13.
The anti-surge diode 11 may be a transient voltage suppressing diode, and under certain conditions, when it is subjected to a voltage pulse at a relatively high moment, its on-state value can be immediately reduced to a very low value, allowing a large current to pass, and clamping the voltage to a stable level, thereby effectively protecting the voltage detection port 22 of the processor of the head-up display. The anti-surge diode 11 is very fast in response, and can effectively prevent transient pulses from damaging the voltage detection port 22 of the processor of the head-up display, and is low in clamping voltage, low in leakage current and junction capacitance, and ideal in performance when handling electrostatic impact of a high-speed conduction loop.
The anti-static diode 12 has the functions of eliminating static electricity and conducting current, and is used for solving transient high-voltage positive-negative static electricity on the power supply 21 of the head-up display, so that the voltage detection port 22 of the processor of the head-up display is effectively protected. The polarity of the anti-static diode 12 is consistent with the positive electrode or the negative electrode of the circuit power supply, and the rated voltage value of the anti-static diode cannot be larger than the working voltage of the head-up display system protection circuit 10. The anti-Static diode 12 may be an ESD (electrostatic discharge) protection diode, mainly used for ESD short pulse, and electrostatic protection with a pulse width of several microseconds or less. The anti-static diode 12 may also be a transient voltage suppression diode.
The bidirectional diode 13 has voltage stabilizing effect in both the forward and reverse directions, just like two voltage stabilizing diodes are connected in reverse series, and the two ends of the bidirectional diode reach the effect of stabilizing voltage in both the forward and reverse directions, so that transient overvoltage can be restrained. Effectively protecting the voltage detection port 22 of the processor of the heads-up display. In this embodiment, when the voltage in the head-up display system protection circuit 10 exceeds the standard in the positive direction, the voltage is reduced by generating a return current to the power supply 21 of the head-up display at one end of the bi-directional diode 13 connected to the power supply 21 of the head-up display, and when the voltage in the head-up display system protection circuit 10 exceeds the standard in the negative direction, the voltage is reduced by generating a voltage-reducing current to 0 at one end of the bi-directional diode 13 grounded.
In this embodiment, the power supply 21 of the head-up display is connected to the anti-surge diode 11, the anti-static diode 12 is connected to the anti-surge diode 11, one end of the bidirectional diode 13 is connected to the anti-static diode 12, and the other end is connected to the voltage detection port 22 of the processor of the head-up display. In other implementation scenarios, the connection order of the anti-surge diode 11, the anti-static diode 12, and the bidirectional diode 13 may be changed, which is not limited herein.
In one implementation scenario, the voltage detection port 22 of the processor of the heads-up display is an ADC (Analog To Digital Converter, analog-to-digital converter) GPIO (General Porpose Intput Output, general purpose input output port) of the MCU (Microcontroller Unit, micro control unit) of the heads-up display.
As can be seen from the above description, in this embodiment, the anti-surge diode can effectively prevent the transient pulse from protecting the voltage detection port of the MCU of the head-up display, the anti-static diode can protect the voltage detection port of the MCU of the head-up display from being damaged by lightning strike, electrostatic discharge and other fast transient voltages, the bidirectional diode can perform overvoltage protection on the voltage detection port of the MCU of the head-up display, triple protection on the voltage detection port of the MCU of the head-up display can be achieved, and therefore the MCU of the head-up display can collect stable voltages, and normal operation of the head-up display can be ensured.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a protection circuit of a head-up display system according to a second embodiment of the present utility model. The head-up display system protection circuit 10 further includes a voltage divider circuit 14, wherein the voltage divider circuit 14 is connected between the anti-static diode 12 and the bidirectional diode 13, and is used for reducing the voltage input to the processor of the visual display to a preset range. In one implementation scenario, the voltage range of the power output of the head-up display includes 9V to 16V, and the voltage range that can be detected by the voltage detection port of the MCU of the head-up display is 0V to 3.3V, so the preset range includes 0V to 3.3V.
By providing the voltage dividing circuit, the voltage Gao Yuping provided by the power supply of the head-up display can be divided when the voltage detected by the voltage detecting port of the MCU of the display is within the detectable range, so that the voltage transmitted to the voltage detecting port of the MCU of the head-up display is within the detectable range.
With continued reference to fig. 2, the head-up display system protection circuit 10 further includes a filter circuit 15, where the filter circuit 15 is capable of filtering low-frequency and high-frequency ac interference in the power supplied by the power supply 21 of the head-up display. The filter circuit 15 is connected between the anti-surge diode 12 and the bidirectional diode 13, and in one embodiment, may be disposed between the voltage dividing circuit 14 and the anti-surge diode 12, or may be disposed between the voltage dividing circuit 14 and the bidirectional diode 13.
In a specific implementation scenario, the filtering circuit 15 includes a high-pass filtering circuit 151 and a low-pass filtering circuit 152, the high-pass filtering circuit 151 is connected between the anti-surge diode 11 and the bidirectional diode 13, and the low-pass filtering circuit 152 is connected between the anti-surge diode 11 and the bidirectional diode 13. The high-pass filter circuit 151 is used for filtering low-frequency ac interference in the electric quantity provided on the power supply of the head-up display, and the low-pass filter circuit 152 is used for filtering high-frequency ac interference in the electric quantity provided on the power supply of the head-up display, so that high-frequency/low-frequency ac signals are prevented from entering the MCU, and the detection of voltage by the MCU is interfered.
In the implementation scenario shown in fig. 2, one end of the high-pass filter circuit 151 is connected to the anti-surge diode 12, the other end is connected to the anti-static diode 12, one end of the low-pass filter circuit 152 is connected to the voltage divider circuit 14, the other end is connected to the bidirectional diode 13, and in other implementation scenarios, the high-pass filter circuit 151 and the low-pass filter circuit 152 may be connected at any position between the anti-surge diode 11 and the bidirectional diode 13, that is, the connection sequence of the high-pass filter circuit 151, the low-pass filter circuit 152, the voltage divider circuit 14 and the anti-static diode 12 between the anti-surge diode 11 and the bidirectional diode 13 may be arbitrarily combined, which is not limited herein.
As can be seen from the above description, in this embodiment, the filtering circuit can filter low-frequency and high-frequency ac interference in the filtering circuit, so as to improve the detection accuracy of the MCU ADC port.
The foregoing disclosure is illustrative of the present utility model and is not to be construed as limiting the scope of the utility model, which is defined by the appended claims.
Claims (10)
1. A heads-up display system protection circuit for protecting a voltage detection port of a processor of a heads-up display, the heads-up display system protection circuit comprising:
an anti-surge diode connected with a power supply of the head-up display;
an anti-static diode connected with the anti-surge diode;
and one end of the bidirectional diode is connected with the antistatic diode, and the other end of the bidirectional diode is connected with a voltage detection port of a processor of the head-up display.
2. The heads-up display system protection circuit of claim 1, further comprising:
and the voltage dividing circuit is connected between the antistatic diode and the bidirectional diode and is used for reducing the voltage input into the processor of the visual display to a preset range.
3. The head-up display system protection circuit of claim 2, wherein,
the preset range includes 0V to 3.3V.
4. The head-up display system protection circuit of claim 2, wherein,
the voltage range of the power supply output of the head-up display includes 9V to 16V.
5. The heads-up display system protection circuit of claim 1, further comprising:
and the filter circuit is connected between the anti-surge diode and the bidirectional diode.
6. The heads-up display system protection circuit of claim 5 wherein the filter circuit comprises:
and the high-pass filter circuit is connected between the anti-surge diode and the bidirectional diode.
7. The heads-up display system protection circuit of claim 6 wherein the filter circuit further comprises:
and the low-pass filter circuit is connected between the anti-surge diode and the bidirectional diode.
8. The heads-up display system protection circuit of claim 1 wherein the voltage detection port is an analog-to-digital conversion input/output port of the processor.
9. A heads-up display system comprising the heads-up display system protection circuit of any one of claims 1-8.
10. An automotive driving system comprising the heads-up display system of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320328075.7U CN219576641U (en) | 2023-02-21 | 2023-02-21 | Head-up display system, protection circuit thereof and automobile driving system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320328075.7U CN219576641U (en) | 2023-02-21 | 2023-02-21 | Head-up display system, protection circuit thereof and automobile driving system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219576641U true CN219576641U (en) | 2023-08-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320328075.7U Active CN219576641U (en) | 2023-02-21 | 2023-02-21 | Head-up display system, protection circuit thereof and automobile driving system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219576641U (en) |
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2023
- 2023-02-21 CN CN202320328075.7U patent/CN219576641U/en active Active
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