Vehicle lamp power supply processing circuit

Abstract

The utility model discloses a vehicle lamp power supply processing circuit, which comprises a power supply input processing module, a converter, an overcurrent protection module, a voltage setting module and a switching frequency setting module, the input end of the power supply input processing module is connected with a vehicle body power supply, the output end of the power supply input processing module is connected with the converter, and the power supply input processing module is used for carrying out anti-surge and anti-reverse filtering processing on the vehicle body power supply; the overcurrent protection module is connected with the converter and is used for closing an output channel of the converter when the output current of the converter exceeds a set value; and the voltage setting module is connected with the converter and is used for setting an output voltage value of the converter. The vehicle lamp power supply processing circuit provided by the utility model can still work normally after the vehicle body input voltage is reduced to a certain voltage value, so that the driving power of a post-stage load is reduced, the use number of chips is reduced, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to a vehicle lamp power supply processing circuit, belonging to the technical field of vehicle lamps. Background Art

[0002] LEDs, with their energy-saving, environmentally friendly, long lifespan, high luminous efficiency, rich colors, compact size, flicker resistance, high reliability, and easy control, have become a key feature of future generations of automobiles. However, unstable automotive power supply voltages can prevent headlights from maintaining normal brightness. Furthermore, the increasing number of LEDs in headlights, driven by the diverse design styles, results in higher power requirements for downstream load chips, increasing costs and reducing space utilization. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing technology and provide a headlight power processing circuit that can still work normally after reducing the input voltage of the vehicle body to a certain voltage value, thereby reducing the driving power of the subsequent load, reducing the number of chips used, and thus reducing costs.

[0004] In order to solve the above technical problems, the technical solution of the utility model is:

[0005] A vehicle light power processing circuit includes a power input processing module, a converter, an overcurrent protection module, a voltage setting module, and a switching frequency setting module;

[0006] The input end of the power input processing module is connected to the vehicle body power supply, and the output end of the power input processing module is connected to the converter. The power input processing module is used to perform surge protection and anti-reverse filtering on the vehicle body power supply;

[0007] The overcurrent protection module is connected to the converter and is used to shut down the output channel of the converter when the output current of the converter exceeds a set value;

[0008] The voltage setting module is connected to the converter, and the voltage setting module is used to set the output voltage value of the converter;

[0009] The switching frequency setting module is connected to the converter, and the switching frequency setting module is used for the switching frequency of the converter.

[0010] Furthermore, the converter includes a power supply chip U1 , and the model of the power supply chip U1 is TPS552892.

[0011] Furthermore, the overcurrent protection module includes a resistor R5 and a resistor R6, one end of the resistor R5 is connected to pin 11 of the power chip U1, the other end of the resistor R5 is connected to one end of the resistor R6, and the other end of the resistor R6 is connected to pin 12 of the power chip U1 through a resistor R8.

[0012] Furthermore, the voltage setting module includes a resistor R7 and a resistor R13, one end of the resistor R7 is connected to the other end of the resistor R5, the other end of the resistor R7 is connected to one end of the resistor R13, one end of the resistor R13 is connected to pin 14 of the power chip U1, and the other end of the resistor R13 is grounded.

[0013] Furthermore, the switching frequency setting module includes a resistor R17 , one end of the resistor R17 is connected to pin 6 of the power chip U1 , and the other end of the resistor R17 is grounded.

[0014] By adopting the above-mentioned technical solution, the headlight power supply processing circuit provided by the present invention is applied to headlights and can maintain a stable output based on the fluctuating body input voltage. When the body power supply voltage fluctuates, the circuit can still maintain a stable output voltage to ensure the brightness consistency of the LED lamp beads. Moreover, by utilizing this characteristic of the circuit, after the body input voltage is reduced to a certain voltage value, it can not only operate normally, but also reduce the driving power of the subsequent load, thereby reducing the number of chips used, thereby reducing energy consumption and costs. The headlight power supply processing circuit of the present invention does not require an external MOS switch tube, further reducing costs and improving space utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a principle block diagram of a vehicle light power processing circuit of the utility model;

[0016] Figure 2 The utility model is a circuit principle diagram of a vehicle light power processing circuit. DETAILED DESCRIPTION

[0017] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0018] like Figure 1 As shown, this embodiment provides a vehicle light power processing circuit, which includes a power input processing module, a converter, an overcurrent protection module, a voltage setting module, and a switching frequency setting module.

[0019] The input end of the power input processing module is connected to the vehicle body power supply, and the output end of the power input processing module is connected to the converter. The power input processing module is used to perform surge protection and anti-reverse filtering on the vehicle body power supply.

[0020] The overcurrent protection module is connected to the converter, and is used to shut down the output channel of the converter when the output current of the converter exceeds a set value.

[0021] The voltage setting module is connected to the converter, and is used to set the output voltage value of the converter.

[0022] The switching frequency setting module is connected to the converter, and the switching frequency setting module is used for the switching frequency of the converter.

[0023] like Figure 2 As shown, the power input processing module of this embodiment includes a TVS diode ST1, a reverse polarity diode D1, and a filter circuit. The VCC terminal is powered by the vehicle body power supply, which typically has a voltage range of 9-16V. The TVS diode ST1 protects the entire circuit from transient voltages and ESD interference. The reverse polarity diode D1 prevents the vehicle body power supply from being reversely connected and damaging subsequent circuits. A filter circuit is located after the reverse polarity diode D1 to filter the vehicle body power supply.

[0024] like Figure 2 As shown, the converter of this embodiment is a BUCK-BOOST converter, which uses a power chip U1, and the model of the power chip U1 is TPS552892. The BUCK-BOOST topology drive circuit is used to perform step-up and step-down, and the SUPPLY terminal will have a corresponding voltage output.

[0025] like Figure 2 As shown, the overcurrent protection module of this embodiment includes resistors R5 and R6. One end of resistor R5 is connected to pin 11 of power chip U1, and the other end of resistor R5 is connected to one end of resistor R6. The other end of resistor R6 is connected to pin 12 of power chip U1 through resistor R8. The current limit of the overcurrent protection is set by resistors R5 and R6, using the formula I = 0.05 / (R5 / / R6), where / / represents parallel connection. When the output current I of the SUPPLY terminal exceeds the set value, the circuit shuts down the SUPPLY output.

[0026] like Figure 2 As shown, the voltage setting module of this embodiment includes resistors R7 and R13. One end of resistor R7 is connected to the other end of resistor R5, and the other end of resistor R7 is connected to one end of resistor R13. One end of resistor R13 is connected to pin 14 of power chip U1, and the other end of resistor R13 is grounded. The voltage of SUPPLY port is set by resistors R7 and R13, and the formula V is used. SUPPLY =1.2*(1+R7 / R13). When the VCC port voltage fluctuates between 9-16V, the output voltage of the SUPPLY terminal can be maintained at a fixed voltage value.

[0027] like Figure 2As shown, the switching frequency setting module of this embodiment includes a resistor R17. One end of the resistor R17 is connected to pin 6 of the power chip U1, and the other end of the resistor R17 is grounded. The switching frequency is set by the resistor R17 at the FSW pin, using the formula f = 1000 / (0.05 * R17 + 35). The switching frequency is changed by changing the value of the resistor R17.

[0028] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A vehicle light power processing circuit, characterized in that: It includes a power input processing module, a converter, an overcurrent protection module, a voltage setting module, and a switching frequency setting module; The input end of the power input processing module is connected to the vehicle body power supply, and the output end of the power input processing module is connected to the converter. The power input processing module is used to perform surge protection and anti-reverse filtering on the vehicle body power supply; The overcurrent protection module is connected to the converter and is used to shut down the output channel of the converter when the output current of the converter exceeds a set value; The voltage setting module is connected to the converter, and the voltage setting module is used to set the output voltage value of the converter; The switching frequency setting module is connected to the converter, and the switching frequency setting module is used for the switching frequency of the converter.

2. The vehicle light power processing circuit according to claim 1, wherein: The converter includes a power supply chip U1 , and the model of the power supply chip U1 is TPS552892.

3. The vehicle light power processing circuit according to claim 2, wherein: The overcurrent protection module includes a resistor R5 and a resistor R6. One end of the resistor R5 is connected to pin 11 of the power chip U1. The other end of the resistor R5 is connected to one end of the resistor R6. The other end of the resistor R6 is connected to pin 12 of the power chip U1 through a resistor R8.

4. The vehicle light power processing circuit according to claim 3, wherein: The voltage setting module includes a resistor R7 and a resistor R13, one end of the resistor R7 is connected to the other end of the resistor R5, the other end of the resistor R7 is connected to one end of the resistor R13, one end of the resistor R13 is connected to pin 14 of the power chip U1, and the other end of the resistor R13 is grounded.

5. The vehicle light power processing circuit according to claim 2, wherein: The switching frequency setting module includes a resistor R17 , one end of the resistor R17 is connected to pin 6 of the power chip U1 , and the other end of the resistor R17 is grounded.

Images