A vehicle light driving system and control method thereof

Abstract

The embodiment of the present application provides a vehicle lamp driving system and a control method thereof, wherein the vehicle lamp driving system comprises: an input module, comprising a first power supply circuit and a second power supply circuit; an anti-reverse connection module, connected to the input module, the anti-reverse connection module comprising a first anti-reverse connection circuit and a second anti-reverse connection circuit, the first anti-reverse connection circuit being connected to the first power supply circuit, and the second anti-reverse connection circuit being connected to the second power supply circuit; a power conversion module, connected to the anti-reverse connection module; and a control module, connected to the input module and the first anti-reverse connection circuit, for collecting input signals from the input module and controlling the first anti-reverse connection circuit. The present application realizes anti-reverse connection of the vehicle lamp circuit and avoids the risk of leakage.

Description

Technical Field

[0001] The present application relates to the field of lighting technology, and in particular to a vehicle lamp driving system and a control method thereof. Background Art

[0002] Headlights are essential accessories for every car. They can provide lighting and indication. Headlights work under the drive of a driving circuit. In order to prevent damage to electronic equipment, an anti-reverse connection circuit is generally added to the driving circuit of the headlights.

[0003] At present, there are two main types of anti-reverse connection circuits for car lights. One is to use Schottky diodes in the circuit for anti-reverse connection. When the polarity of the car light is reversed, the diode will not conduct in the reverse direction. However, this method will reduce the working efficiency of the entire drive circuit under conditions of large currents, and large currents are likely to cause device aging and damage, affecting the working life of the diode. The other is to use Mosfet (Metal-Oxide-Semiconductor Field-Effect Transistor) instead of the diode, which can improve the working efficiency of the drive circuit, but because Mosfet has bidirectional conductivity, there will be leakage. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a vehicle light driving system and a control method thereof, so as to prevent the vehicle light circuit from being reversely connected and avoid the risk of leakage.

[0005] A first aspect of an embodiment of the present application provides a vehicle light driving system, comprising: an input module, comprising a first power supply circuit and a second power supply circuit; an anti-reverse connection module, connected to the input module, the anti-reverse connection module comprising a first anti-reverse connection circuit and a second anti-reverse connection circuit, the first anti-reverse connection circuit being connected to the first power supply circuit, and the second anti-reverse connection circuit being connected to the second power supply circuit; a power conversion module, connected to the anti-reverse connection module; and a control module, connected to the input module and the first anti-reverse connection circuit, for collecting an input signal of the input module and controlling the first anti-reverse connection circuit.

[0006] In one embodiment, the first power supply circuit includes: a first input power supply, connected to the first anti-reverse connection circuit; a first capacitor, a first end of the first capacitor is connected to the first input power supply, and a second end of the first capacitor is grounded; a first resistor, a first end of the first resistor is connected to the first end of the first capacitor and the first anti-reverse connection circuit, and a second end of the first resistor is grounded.

[0007] In one embodiment, the first anti-reverse connection circuit includes: a MOSFET switch, the drain of the MOSFET switch is connected to the first power supply circuit, the source of the MOSFET switch is connected to the power conversion module, and the gate of the MOSFET switch is connected to the control module.

[0008] In one embodiment, the second anti-reverse connection circuit includes: a diode, wherein the anode of the diode is connected to the second power supply circuit, and the cathode of the diode is connected to the power conversion module.

[0009] In one embodiment, the control module includes a first sampling interface connected to the first power supply circuit and used to collect a first input signal of the first power supply circuit; a second sampling interface connected to the second power supply circuit and used to collect a second input signal of the second power supply circuit.

[0010] In one embodiment, the first sampling interface is an A / D sampling interface or an I / O sampling interface.

[0011] In one embodiment, the control module is a single chip microcomputer.

[0012] In one embodiment, the second power supply circuit includes: a second input power supply connected to the second anti-reverse connection circuit; a second capacitor, a first end of the second capacitor is connected to the second input power supply, and a second end of the second capacitor is grounded.

[0013] In one embodiment, the second power supply circuit further includes: a second resistor, a first end of the second resistor connected to the first end of the second capacitor; a Zener diode, a cathode of the Zener diode connected to the second end of the second resistor, and a cathode of the Zener diode grounded.

[0014] The second aspect of the embodiment of the present application provides a vehicle light drive system control method, including: collecting a first input signal and a second input signal; determining whether the first input signal and the second input signal are both high-level; when the first input signal and the second input signal are both high-level, disconnecting the MOSFET switch, incrementing a counter, and recording the disconnection duration by a timer; determining whether the disconnection duration is less than a first preset duration; when the disconnection duration is not less than the first preset duration, detecting the current first input signal and marking the detection result; closing the MOSFET switch, and recording the closing duration by a timer; determining whether the closing duration is less than a second preset duration; when the closing duration is not less than the second preset duration, determining whether the value of the counter is less than a preset number of times; when the value of the counter is less than the preset number of times, continuing to disconnect the MOSFET switch, incrementing the counter, and recording the disconnection duration by a timer, until the value of the counter is greater than or equal to the preset number of times, then determining whether the detection result has a high level; when the detection result does not have a high level, disconnecting the MOSFET switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a schematic structural diagram of a vehicle light driving system according to an embodiment of the present application;

[0017] Figure 2 A circuit diagram of a vehicle light driving system according to an embodiment of the present application;

[0018] Figure 3 Schematic diagram of a flow chart of a method for controlling a vehicle light driving system according to an embodiment of the present application.

[0019] Reference numerals:

[0020] 100-headlight driving system, 110-input module, 111-first power supply circuit, 112-second power supply circuit, 120-anti-reverse connection module, 121-first anti-reverse connection circuit, 122-second anti-reverse connection circuit, 130-power conversion module, 140-control module, 141-first sampling interface, 142-second sampling interface;

[0021] 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, D2-Zener diode. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0023] In the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and do not indicate the order of arrangement, nor can they be understood as indicating or implying relative importance.

[0024] In the description of the present application, the terms "include", "comprising", etc. indicate the existence of the described features, integers, steps, operations, elements and / or components, but do not exclude the existence or addition of one or more other features, steps, operations, elements, components and / or collections thereof.

[0025] In the description of this application, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of the present application, the terms "upper", "lower", "left", "right", "front", "back", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the products of the present application are usually placed when in use. They are only for the convenience of describing the present application, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0027] In the description of this application, unless otherwise clearly specified and limited, the terms "installed", "set", "provided with", "connected", and "configured to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] Please see Figure 1, which is a structural schematic 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 anti-reverse connection module 120 is connected to the input module 110, wherein the input module 110 includes a first power supply circuit 111 and a second power supply circuit 112, the anti-reverse connection module 120 includes a first anti-reverse connection circuit 121 and a second anti-reverse connection circuit 122, the first anti-reverse connection circuit 121 is connected to the first power supply circuit 111, and the second anti-reverse connection circuit 122 is connected to the second power supply circuit 112.

[0029] The power conversion module 130 is connected to the anti-reverse connection module 120, and the control module 140 is connected to the input module 110 and the first anti-reverse connection circuit 121, and is used to collect the input signal of the input module 110, which includes the first input signal of the first power circuit 111 and the second input signal of the second power circuit 112. The control module 140 is also used to control the first anti-reverse connection circuit 121.

[0030] In one embodiment, the control module 140 controls the on or off of the first anti-reverse connection circuit 121 according to the received input signal, performs multiple detections on the first input signal, and determines whether there is an external power supply based on the detection results. If there is no external power supply, the first anti-reverse connection circuit 121 is completely disconnected.

[0031] like Figure 2 As shown, it is a circuit diagram of a headlight driving system 100 according to an embodiment of the present application. The headlight 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 circuit 111 includes: 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 to a BCM (Body Control Module), the first input power supply DRL is connected to the first anti-reverse connection circuit 121, the first end of the first capacitor C1 is connected to the first input power supply DRL, the second end of the first capacitor C1 is grounded, the first end of the first resistor R1 is connected to the first end of the first capacitor C1 and the first anti-reverse connection circuit 121, and the second end of the first resistor R1 is grounded.

[0032] The second power supply circuit 112 includes: a second input power supply PLTURN, a second capacitor C2, a second resistor R2 and a Zener diode D2, wherein the second input power supply PLTURN is a position light and / or turn light power supply connected to the BCM, the second input power supply PLTURN is connected to the second anti-reverse connection circuit 122, the first end of the second capacitor C2 is connected to the second input power supply PLTURN, the second end of the second capacitor C2 is grounded, the first end of the second resistor R2 is connected to the first end of the second capacitor C2, the second end of the second resistor R2 is connected to the cathode of the Zener diode D2, and the anode of the Zener diode D2 is grounded.

[0033] In one embodiment, the first anti-reverse connection circuit 121 includes a MOSFET switch K1, the drain of the MOSFET switch K1 is connected to the first power supply circuit 111, the source of the MOSFET switch K1 is connected to the power conversion module 130, and the gate of the MOSFET switch K1 is connected to the control module 140. The first anti-reverse connection circuit 121 is used to prevent the first input power supply DRL from being reversely connected. The second anti-reverse connection circuit 122 includes a diode D1, the positive electrode of the diode D1 is connected to the second power supply circuit 112, and the negative electrode of the diode D1 is connected to the power conversion module 130. In one embodiment, the diode D1 is a Schottky diode. The second anti-reverse connection circuit 122 is used to prevent the second input power supply PLTURN from being reversely connected.

[0034] In one embodiment, the power conversion module 130 includes a DCDC driving circuit. The first input power DRL can supply power to the DCDC driving circuit through a first anti-reverse connection circuit 121 , and the second input power PLTURN can supply power to the DCDC through a second anti-reverse connection circuit 122 .

[0035] In one 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, and is used to collect a first input signal of the first power circuit 111, and the second sampling interface 142 is connected to the second power circuit 112, and is used to collect 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 microcontroller unit (MCU).

[0036] In one embodiment, the first sampling interface 141 of the control module 140 is connected to the first power supply circuit 111 to collect the first input signal, and the second sampling interface 142 of the control module 140 is connected to the second power supply circuit 112 to collect the second input signal. When it is recognized that the first input signal and the second input signal are both high level, due to the bidirectional conductivity of the MOSFET switch K1, the prior art cannot determine whether the first input signal is high level due to the input of the first input power supply DRL or due to the reverse leakage of the power supply VIN.

[0037] The present application can control the closing or opening of the MOSFET switch K1 through the control module 140, perform a preset number of sampling tests on the first input signal, and mark the test results. In one embodiment, the preset number of times can be 20 times. If the results of the 20 sampling tests are all low levels, it means that there is no external power input, and the MOSFET switch K1 can be completely disconnected. If the results of the 20 sampling tests show a continuous high level, it means that there is external power supply.

[0038] In one embodiment, the cycle of each sampling detection can be 5ms. First, the MOSFET switch K1 is 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 to determine whether the first input signal is at a low level or a high level. The detection result is recorded, and then the MOSFET switch K1 is closed for 4ms.

[0039] In one embodiment, the cycle of each sampling detection can be set according to actual needs. During each sampling detection process, the disconnection time and the closing time of the MOSFET switch K1 can be set according to the capacitance value of the first capacitor C1, the resistance value of the first resistor R1, and actual needs. As long as the first resistor R1 can discharge the electric energy stored in the first capacitor C1 to below the sampling identification voltage of the control module 140 within the disconnection time, it will be sufficient.

[0040] In one embodiment, if both the first input power supply DRL and the second input power supply PLTURN are powered, the control module 140 can identify that both the first input signal and the second input signal are high level, and the control module 140 controls the MOSFET switch K1 to be disconnected for 1ms, so that the first resistor R1 completely discharges the electric energy stored in the first capacitor C1, and then it can be detected that the first input signal is still high level, and then the MOSFET switch K1 is closed for 4ms. The process of disconnecting the MOSFET switch K1 for 1ms, detecting the first input signal, and closing the MOSFET switch K1 for 4ms is repeated 20 times, and the collected first input signal is a continuous high level.

[0041] In one embodiment, if only the second input power supply PLTURN is used for power supply and there is reverse leakage, the control module 140 may also recognize that both the first input signal and the second input signal are high level, and the control module 140 controls the MOSFET switch K1 to be disconnected for 1ms, so that the first resistor R1 completely discharges the electric energy stored in the first capacitor C1, and then the first input signal can be detected to be low level, and the MOSFET switch K1 is closed for 4ms. The process of disconnecting the MOSFET switch K1 for 1ms, detecting the first input signal, and closing the MOSFET switch K1 for 4ms is repeated 20 times, and the collected first input signals are all low level.

[0042] The present application sets a MOSFET switch K1 between the daytime running light input power supply (first input power supply DRL) and the DCDC drive circuit to achieve reverse connection protection without affecting the working efficiency of the daytime running light. Moreover, under the sampling detection and control of the single-chip microcomputer, the power supply of the position light or the turn signal light (second input power supply PLTURN) can be prevented from leaking to the input of the daytime running light through the MOSFET switch K1.

[0043] like Figure 3 As shown, it is a flow chart of a method for controlling a vehicle light driving system according to an embodiment of the present application. The method can be performed by Figure 1 The control module 140 shown in the figure is used to implement the reverse connection protection and leakage protection of the vehicle light driving circuit. The method includes the following steps:

[0044] Step 201: Collect a first input signal and a second input signal.

[0045] Step 202: Determine whether the first input signal and the second input signal are both at high level.

[0046] In the above steps, it is determined whether the first input signal and the second input signal are both high level. If the first input signal and the second input signal are both high level, step 203 is continued to be executed. If the first input signal and the second input signal are not both high level, step 201 is continued to be executed.

[0047] Step 203: Turn off the MOSFET switch, add one to the counter, and record the disconnection duration.

[0048] Step 204: Determine whether the disconnection duration is less than a first preset duration.

[0049] In the above steps, it is determined whether the disconnection duration is less than the first preset duration. If the disconnection duration is less than the first preset duration, step 204 is repeated. If the disconnection duration is not less than the first preset duration, step 205 is continued.

[0050] In one embodiment, the first preset duration may be 1 ms.

[0051] Step 205: Detect the current first input signal and mark the detection result.

[0052] Step 206: Close the MOSFET switch, and the timer records the closing time.

[0053] Step 207: Determine whether the closing time is less than a second preset time.

[0054] In the above steps, it is determined whether the closing time is less than the second preset time. If the closing time is less than the second preset time, step 207 is repeated. If the closing time is not less than the second preset time, step 208 is continued.

[0055] In one embodiment, the second preset time length may be 4 ms.

[0056] Step 208: Determine whether the value of the counter is less than a preset number of times.

[0057] In the above steps, it is determined whether the value of the counter is less than the preset number of times. If the value of the counter is less than the preset number of times, step 203 is continued to be executed. If the value of the counter is greater than or equal to the preset number of times, step 209 is continued to be executed.

[0058] In one embodiment, the preset number of times may be 20 times.

[0059] Step 209: Determine whether the detection result has a high level.

[0060] In the above steps, it is determined whether the detection result has a high level. If the detection result does not have a high level, step 210 is continued to be executed. If the detection result has a high level, step 201 is continued to be executed.

[0061] Step 210: Turn off the MOSFET switch.

[0062] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. The above are only preferred embodiments of the present application, which are only used to illustrate the technical solution of the present application and are not used to limit the present application. For ordinary technicians in this technical field, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A vehicle light driving system control method, characterized in that: The vehicle lamp driving system comprises: an input module, comprising a first power supply circuit and a second power supply circuit; the first input power supply DRL is a daytime running lamp power supply connected to the BCM; the second input power supply PLTURN is a position lamp and / or turn lamp power supply connected to the BCM; an anti-reverse connection module, connected to the input module, the anti-reverse connection module comprising a first anti-reverse connection circuit and a second anti-reverse connection circuit, the first anti-reverse connection circuit being connected to the first power supply circuit, and the second anti-reverse connection circuit being connected to the second power supply circuit; A power conversion module connected to the anti-reverse connection module; A control module, connected to the input module and the first anti-reverse connection circuit, for collecting an input signal of the input module and controlling the first anti-reverse connection circuit; The first anti-reverse connection circuit comprises: a MOSFET switch, wherein the drain of the MOSFET switch is connected to the first power supply circuit, the source of the MOSFET switch is connected to the power conversion module, and the gate of the MOSFET switch is connected to the control module; The second anti-reverse connection circuit comprises: a diode, wherein the positive electrode of the diode is connected to the second power supply circuit, and the negative electrode of the diode is connected to the power conversion module; The vehicle lamp driving system control method comprises: collecting a first input signal and a second input signal; Determining whether the first input signal and the second input signal are both at high levels; When the first input signal and the second input signal are both at high levels, the MOSFET switch is turned off, the counter is incremented by one, and the timer records the disconnection duration; Determining whether the disconnection duration is less than a first preset duration; When the disconnection duration is not less than the first preset duration, detecting the current first input signal and marking the detection result; Close the MOSFET switch, and the timer records the closing time; Determining whether the closing time is less than a second preset time; When the closing time is not less than the second preset time, determining whether the value of the counter is less than a preset number of times; When the value of the counter is less than the preset number of times, the MOSFET switch is disconnected, the counter is incremented by one, and the timer records the disconnection duration. When the value of the counter is greater than or equal to the preset number of times, it is determined whether the detection result is at a high level. When the detection result does not have a high level, the MOSFET switch is turned off.

2. The vehicle light driving system control method according to claim 1, characterized in that: The first power supply circuit comprises: A first input power supply connected to the first anti-reverse connection circuit; A first capacitor, wherein a first end of the first capacitor is connected to the first input power supply, and a second end of the first capacitor is grounded; A first resistor, wherein a first end of the first resistor is connected to a first end of the first capacitor and the first anti-reverse connection circuit, and a second end of the first resistor is grounded.

3. The vehicle light driving system control method according to claim 1, characterized in that: The control module comprises: A first sampling interface, connected to the first power circuit, and used to collect a first input signal of the first power circuit; The second sampling interface is connected to the second power supply circuit and is used to collect a second input signal of the second power supply circuit.

4. The vehicle light driving system control method according to claim 3, characterized in that: The first sampling interface is an A / D sampling interface or an I / O sampling interface.

5. The vehicle light driving system control method according to claim 1, characterized in that: The control module is a single chip microcomputer.

6. The vehicle light driving system control method according to claim 1, characterized in that: The second power supply circuit comprises: A second input power supply connected to the second anti-reverse connection circuit; A second capacitor, wherein a first end of the second capacitor is connected to the second input power supply, and a second end of the second capacitor is grounded.

7. The vehicle light driving system control method according to claim 6, characterized in that: The second power supply circuit further includes: a second resistor, wherein a first end of the second resistor is connected to a first end of the second capacitor; A voltage stabilizing diode, wherein a cathode of the voltage stabilizing diode is connected to the second end of the second resistor, and an anode of the voltage stabilizing diode is grounded.

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