CN213880361U - Car lamp driving system - Google Patents
Car lamp driving system Download PDFInfo
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- CN213880361U CN213880361U CN202022648952.8U CN202022648952U CN213880361U CN 213880361 U CN213880361 U CN 213880361U CN 202022648952 U CN202022648952 U CN 202022648952U CN 213880361 U CN213880361 U CN 213880361U
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Abstract
The embodiment of the present application provides a car light actuating system, car light actuating system includes: an input module including a first power circuit and a second power circuit; the reverse connection prevention module is connected with the input module and comprises a first reverse connection prevention circuit and a second reverse connection prevention circuit, the first reverse connection prevention circuit is connected with the first power supply circuit, and the second reverse connection prevention circuit is connected with the second power supply circuit; the power supply conversion module is connected with the reverse connection prevention module; and the control module is connected with the input module and the first reverse connection preventing circuit and is used for acquiring the input signal of the input module and controlling the first reverse connection preventing circuit. This application has realized that car light circuit prevents reverse connection to avoid the electric leakage risk.
Description
Technical Field
The application relates to the technical field of lighting, in particular to a car lamp driving system.
Background
The car light is the accessory that every car is necessary, can play the effect of illumination and instruction, and the car light is worked under drive circuit's drive, in order to prevent that electronic equipment from damaging, will add a anti-reverse connection circuit at the drive circuit of car light generally.
At present, the reverse connection preventing circuit of the car lamp is mainly of two types, one type is that a Schottky diode is adopted in the circuit to prevent reverse connection, when the polarity of the car lamp is reversely connected, the diode is not conducted in the reverse direction, but the working efficiency of the whole driving circuit can be reduced under the working condition of large current, and the large current easily causes aging and damage of devices and influences the service life of the diode. The other is to use a Mosfet (Metal-Oxide-Semiconductor Field-Effect Transistor) instead of the diode, which can improve the working efficiency of the driving circuit, but because the Mosfet has bidirectional conductivity, there will be a leakage situation.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the present application is to provide a vehicle lamp driving system and a control method thereof, so as to achieve reverse connection prevention of a vehicle lamp circuit and avoid a risk of electric leakage.
A first aspect of an embodiment of the present application provides a vehicle lamp driving system, including: an input module including a first power circuit and a second power circuit; the reverse connection prevention module is connected with the input module and comprises a first reverse connection prevention circuit and a second reverse connection prevention circuit, the first reverse connection prevention circuit is connected with the first power supply circuit, and the second reverse connection prevention circuit is connected with the second power supply circuit; the power supply conversion module is connected with the reverse connection prevention module; and the control module is connected with the input module and the first reverse connection preventing circuit and is used for acquiring the input signal of the input module and controlling the first reverse connection preventing circuit.
In one embodiment, the first power circuit includes: the first input power supply is connected with the first anti-reverse connection circuit; a first end of the first capacitor is connected with the first input power supply, and a second end of the first capacitor is grounded; the first end of the first resistor is connected with the first end of the first capacitor and the first anti-reverse connection circuit, and the second end of the first resistor is grounded.
In one embodiment, the first anti-reverse connection circuit includes: the drain electrode of the MOSFET switch is connected with the first power supply circuit, the source electrode of the MOSFET switch is connected with the power supply conversion module, and the grid electrode of the MOSFET switch is connected with the control module.
In one embodiment, the second anti-reverse connection circuit includes: and the anode of the diode is connected with the second power supply circuit, and the cathode of the diode is connected with the power supply conversion module.
In an embodiment, the control module includes a first sampling interface, connected to the first power circuit, and configured to collect a first input signal of the first power circuit; and the second sampling interface is connected with the second power supply circuit and is used for acquiring a second input signal of the second power supply circuit.
In an embodiment, the first sampling interface is an a/D sampling interface or an I/O sampling interface.
In one embodiment, the control module is a single chip microcomputer.
In one embodiment, the second power circuit includes: the second input power supply is connected with the second anti-reverse connection circuit; and a first end of the second capacitor is connected with the second input power supply, and a second end of the second capacitor is grounded.
In one embodiment, the second power circuit further includes: a first end of the second resistor is connected with a first end of the second capacitor; and the cathode of the voltage stabilizing diode is connected with the second end of the second resistor, and the anode of the voltage stabilizing diode is grounded.
In one embodiment, the diode is a schottky diode.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a vehicle lamp driving system according to an embodiment of the present application;
fig. 2 is a circuit diagram of a vehicle lamp driving system according to an embodiment of the present application.
Reference numerals:
100-a vehicle lamp driving system, 110-an input module, 111-a first power circuit, 112-a second power circuit, 120-an anti-reverse connection module, 121-a first anti-reverse connection circuit, 122-a second anti-reverse connection circuit, 130-a power conversion module, 140-a control module, 141-a first sampling interface and 142-a second sampling interface;
DRL-first input power supply, C1-first capacitor, R1-first resistor, K1-MOSFET switch, D1-diode, PLTURN-second input power supply, C2-second capacitor, R2-second resistor, and D2-zener diode.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
In the description of the present application, the terms "first," "second," and the like are used for distinguishing between descriptions and do not denote an order of magnitude, nor are they to be construed as indicating or implying relative importance.
In the description of the present application, the terms "comprises," "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof.
In the description of the present application, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are absolutely required to be horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, the terms "upper", "lower", "left", "right", "front", "back", "inner", "outer", and the like refer to orientations or positional relationships that are based on orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally found in the products of the application, and are used for convenience in describing the present application, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present application.
In the description of the present application, the terms "mounted," "disposed," "provided," "connected," and "configured" are to be construed broadly unless expressly stated or limited otherwise. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be internal to two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
Referring to fig. 1, which is a schematic structural diagram of a vehicle lamp driving system 100 according to an embodiment of the present application, the vehicle lamp driving system 100 includes an input module 110, an anti-reverse connection module 120, a power conversion module 130, and a control module 140. The reverse connection prevention module 120 is connected to the input module 110, wherein the input module 110 includes a first power circuit 111 and a second power circuit 112, the reverse connection prevention module 120 includes a first reverse connection prevention circuit 121 and a second reverse connection prevention circuit 122, the first reverse connection prevention circuit 121 is connected to the first power circuit 111, and the second reverse connection prevention circuit 122 is connected to the second power circuit 112.
The power conversion module 130 is connected to the reverse connection preventing module 120, the control module 140 is connected to the input module 110 and the first reverse connection preventing circuit 121, and is configured to collect input signals of the input module 110, where the input signals include a first input signal of the first power circuit 111 and a second input signal of the second power circuit 112, and the control module 140 is further configured to control the first reverse connection preventing circuit 121.
In an embodiment, the control module 140 controls the first anti-reverse connection circuit 121 to be turned on or off according to the received input signal, performs multiple detections on the first input signal, determines whether an external power supply supplies power according to a detection result, and completely turns off the first anti-reverse connection circuit 121 if the external power supply does not supply power.
As shown in fig. 2, which is a circuit diagram of a vehicle lamp driving system 100 according to an embodiment of the present application, the vehicle lamp driving system 100 includes an input module 110, an anti-reverse connection module 120, a power conversion module 130, and a control module 140, wherein the input module 110 includes a first power circuit 111 and a second power circuit 112. The first power supply circuit 111 includes: the vehicle-mounted anti-reverse connection circuit comprises a first input power supply DRL, a first capacitor C1 and a first resistor R1, wherein the first input power supply DRL is a daytime running light power supply connected with a BCM (Body Control Module), the first input power supply DRL is connected with a first anti-reverse connection circuit 121, a first end of a first capacitor C1 is connected with the first input power supply DRL, a second end of the first capacitor C1 is grounded, a first end of a first resistor R1 is connected with a first end of a first capacitor C1 and the first anti-reverse connection circuit 121, and a second end of a first resistor R1 is grounded.
The second power supply circuit 112 includes: the BCM position lamp anti-reverse connection circuit comprises a second input power supply PLTURN, a second capacitor C2, a second resistor R2 and a voltage stabilizing diode D2, wherein the second input power supply PLTURN is a position lamp and/or steering lamp power supply connected with the BCM, the second input power supply PLTURN is connected with a second anti-reverse connection circuit 122, a first end of a second capacitor C2 is connected with the second input power supply PLTURN, a second end of a second capacitor C2 is grounded, a first end of a second resistor R2 is connected with a first end of a second capacitor C2, a second end of a second resistor R2 is connected with the cathode of the voltage stabilizing diode D2, and the anode of the voltage stabilizing diode D2 is grounded.
In one embodiment, the first anti-reverse connection circuit 121 includes a MOSFET switch K1, a drain of the MOSFET switch K1 is connected to the first power circuit 111, a source of the MOSFET switch K1 is connected to the power conversion module 130, and a gate of the MOSFET switch K1 is connected to the control module 140. The first reverse connection prevention circuit 121 serves to prevent the first input power supply DRL from being reversely connected. The second anti-reverse connection circuit 122 includes a diode D1, an anode of the diode D1 is connected to the second power circuit 112, and a cathode of the diode D1 is connected to the power conversion module 130. In one embodiment, the diode D1 is a schottky diode. The second reverse connection prevention circuit 122 serves to prevent the second input power supply PLTURN from being reversely connected.
In one embodiment, the power conversion module 130 includes a DCDC driving circuit. The first input power supply DRL may supply power to the DCDC driving circuit through the first anti-reverse connection circuit 121, and the second input power supply PLTURN may supply power to the DCDC through the second anti-reverse connection circuit 122.
In an embodiment, the control module 140 includes a first sampling interface 141 and a second sampling interface 142, the first sampling interface 141 is connected to the first power circuit 111 for collecting a first input signal of the first power circuit 111, and the second sampling interface 142 is connected to the second power circuit 112 for collecting a second input signal of the second power circuit 112. In one embodiment, the first sampling interface 141 is an A/D sampling interface or an I/O sampling interface. In one embodiment, the control module 140 is a single chip Microcomputer (MCU).
In an embodiment, the first sampling interface 141 of the control module 140 is connected to the first power circuit 111 to collect the first input signal, the second sampling interface 142 of the control module 140 is connected to the second power circuit 112 to collect the second input signal, and when it is recognized that both the first input signal and the second input signal are at a high level, due to the bidirectional conductivity of the MOSFET switch K1, the prior art cannot determine whether the high level of the first input signal is due to the input of the first input power DRL or the reverse leakage of the power VIN.
The application can control the MOSFET switch K1 to be turned on or off through the control module 140, perform sampling detection on the first input signal for a preset number of times, and mark the detection result. In one embodiment, the predetermined number of times may be 20, and if the results of the 20 sampling tests are all low, it indicates that there is no external power input, and the MOSFET switch K1 can be completely turned off. If the continuous high level appears in the result of 20 sampling detection, the external power supply is supplied.
In an embodiment, a sampling detection period may be 5ms each time, the MOSFET switch K1 is first turned off for 1ms, so that the first resistor R1 completely discharges the electric energy stored in the first capacitor C1, then the first input signal is collected, it is determined whether the first input signal is at a low level or a high level, a detection result is recorded, and then the MOSFET switch K1 is turned on for 4 ms.
In an embodiment, the period of each sampling detection may be set according to actual requirements, and during each sampling detection, the open duration and the closed duration of the MOSFET switch K1 may be set according to the capacitance of the first capacitor C1, the resistance of the first resistor R1, and actual requirements, as long as the first resistor R1 can drain the electric energy stored in the first capacitor C1 to be below the sampling identification voltage of the control module 140 during the open duration.
In an embodiment, if the first input power DRL and the second input power PLTURN are both powered, the control module 140 may recognize that the first input signal and the second input signal are both at a high level, and the control module 140 controls the MOSFET switch K1 to be turned off for 1ms, so that the first resistor R1 completely drains the electric energy stored in the first capacitor C1, and then may detect that the first input signal is still at a high level, and then turn on the MOSFET switch K1 for 4 ms. The MOSFET switch K1 is turned off for 1ms, the first input signal is detected, the process that the MOSFET switch K1 is turned on for 4ms is repeated for 20 times, and the collected first input signal is continuously high.
In one embodiment, if only the second input power PLTURN is powered and there is reverse leakage, the control module 140 may recognize that the first input signal and the second input signal are both high, and the control module 140 controls the MOSFET switch K1 to open for 1ms, so that the first resistor R1 completely drains the electric energy stored in the first capacitor C1, and then detects that the first input signal is low, and then closes the MOSFET switch K1 for 4 ms. The MOSFET switch K1 is turned off for 1ms, the first input signal is detected, the process that the MOSFET switch K1 is turned on for 4ms is repeated for 20 times, and the collected first input signal is low level.
This application is through setting up MOSFET switch K1 between driving light input power (first input power DRL) and DCDC drive circuit daytime, when realizing preventing the reversal, can not influence the work efficiency of driving light daytime to under the sampling detection and the control of singlechip, can avoid the power (second input power PLTURN) of position lamp or indicator to leak the input to driving light daytime through MOSFET switch K1.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. The above description is only a preferred embodiment of the present application, and is only for the purpose of illustrating the technical solutions of the present application, and not for the purpose of limiting the present application. Any modification, equivalent replacement, improvement or the like, which would be obvious to one of ordinary skill in the art and would be within the spirit and principle of the present application, should be included within the scope of the present application.
Claims (10)
1. A vehicle lamp driving system characterized by comprising:
an input module including a first power circuit and a second power circuit;
the reverse connection prevention module is connected with the input module and comprises a first reverse connection prevention circuit and a second reverse connection prevention circuit, the first reverse connection prevention circuit is connected with the first power supply circuit, and the second reverse connection prevention circuit is connected with the second power supply circuit;
the power supply conversion module is connected with the reverse connection prevention module;
and the control module is connected with the input module and the first reverse connection preventing circuit and is used for acquiring the input signal of the input module and controlling the first reverse connection preventing circuit.
2. The lamp driving system according to claim 1, wherein the first power supply circuit comprises:
the first input power supply is connected with the first anti-reverse connection circuit;
a first end of the first capacitor is connected with the first input power supply, and a second end of the first capacitor is grounded;
the first end of the first resistor is connected with the first end of the first capacitor and the first anti-reverse connection circuit, and the second end of the first resistor is grounded.
3. The lamp driving system according to claim 1, wherein the first anti-reverse connection circuit comprises:
the drain electrode of the MOSFET switch is connected with the first power supply circuit, the source electrode of the MOSFET switch is connected with the power supply conversion module, and the grid electrode of the MOSFET switch is connected with the control module.
4. The lamp driving system according to claim 1, wherein the second anti-reverse connection circuit comprises:
and the anode of the diode is connected with the second power supply circuit, and the cathode of the diode is connected with the power supply conversion module.
5. The vehicle lamp driving system according to claim 1, wherein the control module comprises:
the first sampling interface is connected with the first power supply circuit and used for acquiring a first input signal of the first power supply circuit;
and the second sampling interface is connected with the second power supply circuit and is used for acquiring a second input signal of the second power supply circuit.
6. The vehicle lamp driving system according to claim 5, wherein the first sampling interface is an A/D sampling interface or an I/O sampling interface.
7. The vehicle lamp driving system according to claim 1, wherein the control module is a single chip microcomputer.
8. The lamp driving system according to claim 1, wherein the second power supply circuit comprises:
the second input power supply is connected with the second anti-reverse connection circuit;
and a first end of the second capacitor is connected with the second input power supply, and a second end of the second capacitor is grounded.
9. The lamp driving system according to claim 8, wherein the second power supply circuit further comprises:
a first end of the second resistor is connected with a first end of the second capacitor;
and the cathode of the voltage stabilizing diode is connected with the second end of the second resistor, and the anode of the voltage stabilizing diode is grounded.
10. The vehicle light driving system according to claim 4, wherein the diode is a schottky diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022648952.8U CN213880361U (en) | 2020-11-16 | 2020-11-16 | Car lamp driving system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022648952.8U CN213880361U (en) | 2020-11-16 | 2020-11-16 | Car lamp driving system |
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| Publication Number | Publication Date |
|---|---|
| CN213880361U true CN213880361U (en) | 2021-08-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022648952.8U Active CN213880361U (en) | 2020-11-16 | 2020-11-16 | Car lamp driving system |
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|---|---|
| CN (1) | CN213880361U (en) |
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- 2020-11-16 CN CN202022648952.8U patent/CN213880361U/en active Active
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