Vehicle-mounted all-round view camera infrared auxiliary light supplementing system

Abstract

The utility model provides a vehicle-mounted all-round camera infrared auxiliary light supplement system, which is applied to the technical field of LED driving, and comprises a voltage conversion module, a constant current driving module and a light supplement lamp, the voltage conversion module comprises a power supply conversion chip, and the constant current driving module comprises a constant current driving chip; the power supply conversion chip is connected with power supply voltage, converts the power supply voltage into power supply voltage matched with the constant-current driving chip and provides voltage for the constant-current driving chip, and the constant-current driving chip is connected with the light supplementing lamp and provides constant current driving for the light supplementing lamp; an SW pin of the constant-current driving chip is connected in parallel with an inductor L1 and a diode D7, the other end of the inductor L1 is connected with a VIN pin of the constant-current driving chip, and the other end of the diode D7 is connected with the light supplementing lamp; the voltage conversion module converts the power supply voltage and outputs the power supply voltage to the constant current driving module, so that the constant current driving module can provide stable current driving for the light supplement lamp, and the consistency of the brightness and the color of the light supplement lamp bead is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of LED driving, and in particular relates to an infrared auxiliary fill light system for a vehicle-mounted surround view camera. Background Art

[0002] Surround view is a key application for automotive cameras. During nighttime driving, where illumination is low, LEDs are often used for supplemental lighting. LEDs are sensitive semiconductor devices with negative temperature characteristics, requiring stable operation and protection during their use.

[0003] Therefore, it is necessary to provide a stable current for the LED to ensure its normal operation. For vehicle-mounted surround-view cameras, it is necessary to design a corresponding driver module based on a fixed vehicle voltage to achieve the stable fill light function of the LED. Utility Model Content

[0004] In view of the above-mentioned problems in the prior art, the purpose of the present invention is to provide an infrared auxiliary fill light system for a vehicle-mounted surround view camera, which converts the power supply voltage through a voltage conversion module and outputs the supply voltage to a constant current drive module, so that the constant current drive module can provide stable current drive for the fill light, thereby ensuring the consistency of the brightness and color of the fill light beads.

[0005] A vehicle-mounted surround-view camera infrared auxiliary fill light system includes a voltage conversion module, a constant current drive module, and a fill light. The voltage conversion module includes a power conversion chip U2, and the constant current drive module includes a constant current drive chip U1. The power conversion chip U2 is connected to a power supply voltage to convert the power supply voltage into a supply voltage compatible with the constant current drive chip U1, providing voltage for the constant current drive chip U1. The constant current drive chip U1 is connected to the fill light to provide constant current drive for the fill light. The SW pin of the constant current drive chip U1 is connected in parallel to an inductor L1 and a diode D7. The other end of the inductor L1 is connected to the VIN pin of the constant current drive chip U1, and the other end of the diode D7 is connected to the fill light. The SW pin of the power conversion chip U2 is connected to an inductor L2. The other end of the inductor L2 serves as the output end of the voltage conversion module to output the required output voltage.

[0006] Preferably, the fill light is connected to the output end of the constant current driving module through the socket J2 and the socket J3, and the VIN pin of the constant current driving chip U1 is connected to the output end of the voltage conversion module to access the power supply voltage.

[0007] Preferably, a capacitor C17 is connected in parallel between the diode D7 and the fill light.

[0008] Preferably, the FB pin of the constant current driver chip U1 is connected to the fill light, and the FB pin of the constant current driver chip U1 is connected to a grounded resistor R1.

[0009] Preferably, the CTRL pin of the constant current driver chip U1 is used to receive an external PWM signal, and the COMP pin of the constant current driver chip U1 is connected to the capacitor C4.

[0010] Preferably, the VIN pin of the power conversion chip U2 is connected to the power supply voltage, and the capacitor C11 and the capacitor C12 are connected in parallel to the VIN pin of the power conversion chip U2.

[0011] Preferably, the EN pin of the power conversion chip U2 is connected to an enable signal for turning on or off the power conversion chip U2.

[0012] Preferably, an internal switch is configured at the SW pin of the power conversion chip U2. The power conversion chip U2 converts the voltage in a PWM manner by controlling the internal switch of the SW pin. A capacitor C13 is connected between the BOOT pin and the SW pin of the power conversion chip U2 to drive the internal switch at the SW pin to operate.

[0013] Preferably, the FB pin of the power conversion chip U2 is connected to a voltage divider network, which includes a resistor R3 and a resistor R4 connected in parallel, the other end of the resistor R4 is grounded, and the other end of the resistor R3 is connected to the inductor L2.

[0014] Preferably, the lamp bead board of the fill light is an aluminum substrate, and the wavelength of light emitted by the fill light is 780nm.

[0015] The beneficial effect of the utility model is that the vehicle-mounted surround-view camera infrared auxiliary fill light system converts the fixed vehicle voltage into the output power supply voltage of the constant current drive module through the voltage conversion module, so that the constant current drive module can provide stable current drive for the fill light, ensure the consistency of the brightness and color of the fill light beads, and can effectively extend the service life of the fill light, and reduce the damage to the LED that may be caused by current overload.

[0016] In addition, by using efficient power conversion chips and constant current driver chips, the high energy efficiency of the entire fill light system is ensured, energy waste is reduced, and the power utilization efficiency of the overall equipment is improved.

[0017] Furthermore, the brightness of the fill light is adjusted through an external PWM signal, so that the user can adjust the brightness of the fill light according to actual needs, thereby improving the applicability of the fill light system.

[0018] Infrared light is used to fill in the vehicle's surround view camera, making it suitable for characteristic scenes. Filling in infrared light that is invisible to the human eye can prevent the vehicle's whereabouts from being exposed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 It is a system block diagram of the utility model;

[0021] Figure 2 This is a structural diagram of the constant current drive module of the utility model;

[0022] Figure 3 It is a structural diagram of the voltage conversion module of the present utility model. DETAILED DESCRIPTION

[0023] Example 1

[0024] like Figure 1 As shown, an infrared auxiliary fill light system for a vehicle-mounted surround view camera includes a voltage conversion module and a constant current drive module, wherein the constant current drive module is connected to the fill light, and the voltage conversion module adjusts the power supply voltage to the supply voltage required by the constant current drive module, so that the constant current drive module can provide a constant current drive for the fill light.

[0025] The constant current drive module includes a constant current drive chip U1, and the fill light is connected to the output end of the constant current drive chip U1 through the socket J2 and the socket J3, so that the fill light can receive a constant current drive.

[0026] like Figure 2 As shown, the model of the constant current driver chip U1 in this embodiment is SGM3726, and the VIN pin of the constant current driver chip U1 is connected to the output end of the voltage conversion module to access the power supply voltage. The power supply voltage in this embodiment is set to 3.2V.

[0027] The SW pin of constant current driver chip U1, acting as an output switch, is connected to a parallel inductor L1 and diode D7. The other end of inductor L1 is connected to the VIN pin of constant current driver chip U1, and the other end of diode D7 is connected to the fill light. Capacitor C17 is connected in parallel between diode D7 and the fill light. Capacitor C17 acts as an output capacitor, smoothing the output voltage and reducing ripple. Inductor L1 stores energy and releases it to power the fill light at the appropriate time.

[0028] The FB pin of the constant current driver chip U1 is also connected to the fill light. The FB pin of the constant current driver chip U1 performs current detection and feedback through the resistor R1 connected to the ground. The current passing through the fill light is monitored in real time through the resistor R1 to ensure the constant current output of the constant current driver module.

[0029] The CTRL pin of the constant current driver chip U1 is used to receive an external PWM signal and adjust the brightness of the fill light according to the parameters of the external PWM signal, so that it can be easily adapted to different ambient light conditions.

[0030] The COMP pin of the constant current driver chip U1 is connected to the capacitor C4 and is used to stabilize the feedback control loop.

[0031] In addition, the voltage conversion module includes a power conversion chip U2, which is used to convert the power supply voltage into a voltage value compatible with the constant current driver chip U1, powering the constant current driver chip U1, so that the constant current driver chip U1 provides a constant current for the fill light beads, which can ensure the consistency of the brightness and color of the fill light beads and avoid the performance degradation of the fill light due to current fluctuations.

[0032] like Figure 3 As shown, the power converter chip U2 in this embodiment is model SGM61220. Specifically, the VIN pin of the power converter chip U2 is connected to the power supply voltage, where the power supply voltage is the vehicle voltage, which in this embodiment is 12V. In addition, capacitors C11 and C12 are connected in parallel to the VIN pin of the power converter chip U2 to stabilize the input voltage and reduce interference from high-frequency noise.

[0033] The EN pin of the power conversion chip U2 is connected to the enable signal, which is used to turn on or off the power conversion chip U2. When the enable signal is high, the power conversion chip U2 is started, and when the enable signal is low, the power conversion chip U2 is disabled.

[0034] The SW pin of power converter chip U2 is equipped with an internal switch. By controlling the internal switch at the SW pin, power converter chip U2 efficiently converts voltage using PWM. Capacitor C13 is connected between the BOOT pin and the SW pin of power converter chip U2 to drive the internal switch at the SW pin and provide the necessary high-level voltage. In this embodiment, the internal switch is a MOS transistor (not shown).

[0035] In addition, the SW pin of power converter chip U2 is connected to inductor L2. The other end of inductor L2 serves as the output terminal of the voltage conversion module to output the required output voltage. Inductor L2 is used to store energy during each cycle and release energy when the internal switch is turned off, helping to smooth the output voltage and reduce ripple.

[0036] In order to adjust the output voltage of the voltage conversion module, a voltage divider network is connected to the FB pin of the power conversion chip U2. The voltage divider network includes parallel resistors R3 and R4. The other end of the resistor R4 is grounded, and the other end of the resistor R3 is connected to the inductor L2. By adjusting the resistance ratio between the resistors R3 and R4, the output voltage of the power conversion chip U2 can be adjusted.

[0037] In addition, in order to further reduce the ripple of the output voltage, capacitors C14, C15 and C16 are configured in parallel at the output end of the voltage conversion module, so that capacitors C14, C15, C16 and inductor L2 form an LC filtering network, and the output ripple is reduced by the LC filtering network.

[0038] The fill light's LED board is constructed of an aluminum substrate, which dissipates heat. Because the pixels and monitoring range of a vehicle's surround-view camera are small, a board with fewer LEDs but higher luminous intensity is suitable. Specifically, unlike the 850-940nm infrared LEDs commonly used for fill light in surveillance cameras, the vehicle-mounted fill light in this implementation utilizes 780nm infrared LEDs, which offer a higher luminous intensity and meet the fill light requirements of a vehicle's surround-view camera.

[0039] In particular, in some special scenarios, using visible light to fill in the surround-view camera can expose the vehicle's whereabouts. Accordingly, using infrared fill-in lamp beads, which are invisible to the human eye, to provide fill light for the surround-view camera can effectively solve the problem of vehicle whereabouts being exposed.

[0040] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An infrared auxiliary fill light system for a vehicle-mounted surround view camera, characterized in that: It includes a voltage conversion module, a constant current drive module and a fill light. The voltage conversion module includes a power conversion chip U2, and the constant current drive module includes a constant current drive chip U1; The power conversion chip U2 is connected to the power supply voltage, converts the power supply voltage into a supply voltage compatible with the constant current driver chip U1, and provides voltage for the constant current driver chip U1. The constant current driver chip U1 is connected to the fill light to provide a constant current drive for the fill light; The SW pin of the constant current driver chip U1 is connected in parallel with an inductor L1 and a diode D7. The other end of the inductor L1 is connected to the VIN pin of the constant current driver chip U1, and the other end of the diode D7 is connected to the fill light. The SW pin of the power conversion chip U2 is connected to the inductor L2, and the other end of the inductor L2 serves as the output end of the voltage conversion module to output the required output voltage.

2. The vehicle-mounted surround view camera infrared auxiliary light filling system according to claim 1, characterized in that: The fill light is connected to the output end of the constant current drive module through the socket J2 and the socket J3. The VIN pin of the constant current drive chip U1 is connected to the output end of the voltage conversion module to access the power supply voltage.

3. The vehicle-mounted surround view camera infrared auxiliary light filling system according to claim 1, characterized in that: A capacitor C17 is connected in parallel between the diode D7 and the fill light.

4. The vehicle-mounted surround view camera infrared auxiliary light filling system according to claim 1, characterized in that: The FB pin of the constant current driver chip U1 is connected to the fill light, and the FB pin of the constant current driver chip U1 is connected to a grounded resistor R1.

5. The vehicle-mounted surround view camera infrared auxiliary light filling system according to claim 1, characterized in that: The CTRL pin of the constant current driver chip U1 is used to receive an external PWM signal, and the COMP pin of the constant current driver chip U1 is connected to the capacitor C4.

6. The vehicle-mounted surround view camera infrared auxiliary light filling system according to claim 1, characterized in that: The VIN pin of the power conversion chip U2 is connected to the power supply voltage, and the capacitor C11 and the capacitor C12 are connected in parallel to the VIN pin of the power conversion chip U2.

7. The vehicle-mounted surround view camera infrared auxiliary light filling system according to claim 1, characterized in that: The EN pin of the power conversion chip U2 is connected to an enable signal for turning on or off the power conversion chip U2.

8. The vehicle-mounted surround view camera infrared auxiliary light filling system according to claim 1, characterized in that: The SW pin of the power conversion chip U2 is configured with an internal switch. The power conversion chip U2 converts voltage in a PWM manner by controlling the internal switch of the SW pin. A capacitor C13 is connected between the BOOT pin and the SW pin of the power conversion chip U2 to drive the internal switch at the SW pin to work.

9. The vehicle-mounted surround view camera infrared auxiliary light filling system according to claim 1, characterized in that: The FB pin of the power conversion chip U2 is connected to a voltage divider network, which includes a resistor R3 and a resistor R4 connected in parallel. The other end of the resistor R4 is grounded, and the other end of the resistor R3 is connected to the inductor L2.

10. The vehicle-mounted surround view camera infrared auxiliary light filling system according to claim 1, characterized in that: The lamp bead board of the fill light is an aluminum substrate, and the wavelength of the infrared light emitted by the fill light is 780nm.

Images