Lighting power supply circuit

Abstract

The utility model provides an illumination power supply circuit which has low radiation and is particularly suitable for high-beam and low-beam illumination of motorcycles and electric vehicles. The lighting power supply circuit comprises a power supply module which is electrically connected with a power supply and supplies power to the lighting power supply circuit; the input end of the constant current module is electrically connected with the first output end of the power supply module, and the constant current module provides constant current for a load; the input end of the follow current module is electrically connected with the second output end of the power supply module; the anti-interference module is electrically connected with the output end of the constant-current module and is used for inhibiting noise generated by the constant-current module; the input end of the power inductor is electrically connected with the output end of the anti-interference module and the output end of the follow current module, and the output end of the power inductor is connected with a filter capacitor; and one end of the filter capacitor is electrically connected with the second output end of the power supply module and the output end of the power inductor, and the other end of the filter capacitor is electrically connected with a load to provide stable current for the load.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle lighting, in particular to a lighting power supply circuit. Background Art

[0002] Two-wheeled vehicles are often used by people to commute to get off work, providing a more convenient means of transportation. The headlights of two-wheeled vehicles are an indispensable part of the vehicle. They can provide lighting needs for people driving at night and provide a great guarantee for night driving safety.

[0003] Current two-wheeled vehicle lighting technology, whether low-beam or high-beam, presents the problem of electromagnetic radiation. In two-wheeled vehicle lighting circuits, electromagnetic radiation is primarily generated by the operation of light sources (such as LEDs). The electronic components in the lighting circuit also generate a certain amount of electromagnetic radiation during operation, and these radiations can overlap or interfere with each other.

[0004] Although the power and intensity of electromagnetic radiation from two-wheeled vehicles are relatively low, long-term exposure to it can still have a certain impact on human health. Furthermore, electromagnetic radiation from two-wheeled vehicle lighting circuits can interfere with other nearby electronic devices and potentially cause environmental pollution and ecological impacts. Utility Model Content

[0005] In order to overcome the above-mentioned defects in the prior art, the purpose of the present invention is to provide a low-radiation lighting power supply circuit, which is particularly suitable for high and low beam lighting of motorcycles and electric vehicles.

[0006] In order to achieve the above-mentioned purpose of the present invention, the present invention provides a lighting power supply circuit, comprising:

[0007] A power supply module, electrically connected to a power source, to supply power to the lighting power supply circuit;

[0008] a constant current module, the input end of which is electrically connected to the first output end of the power supply module, for providing a constant current to the load;

[0009] a freewheeling module, an input end of which is electrically connected to the second output end of the power supply module;

[0010] an anti-interference module, electrically connected to the output end of the constant current module, and suppressing the noise generated by the constant current module;

[0011] A power inductor, whose input end is electrically connected to the output end of the anti-interference module and the output end of the freewheeling module, and whose output end is connected to a filter capacitor;

[0012] A filter capacitor, one end of which is electrically connected to the second output end of the power supply module and the output end of the power inductor, and the other end of which is electrically connected to the load, provides a stable current for the load.

[0013] Optionally, the freewheeling module includes a freewheeling diode and a first RC absorption circuit: the freewheeling diode and the first RC absorption circuit are connected in parallel between the second output terminal of the power supply module and the power inductor.

[0014] Optionally, a second RC absorption circuit is further included, and the second RC absorption circuit is electrically connected between the output end of the constant current module and the ground.

[0015] Optionally, the power supply module includes:

[0016] A rectifier / anti-reverse connection module, whose input end is electrically connected to the power supply and whose output end is the second output end of the power supply module;

[0017] A capacitor filter module is electrically connected between the output terminal of the rectification / anti-reverse connection module and the ground;

[0018] IC power supply module; its input end is electrically connected to the output end of the rectification / anti-reverse connection module, and its output end is the first output end of the power supply module, which is electrically connected to the power supply end of the constant current module.

[0019] Optionally, the system further includes a current output control module electrically connected between the output current sampling terminal of the constant current module and the ground, and the current output control module includes a first resistor and a second resistor connected in parallel.

[0020] Optionally, the anti-interference module is an anti-interference magnetic bead.

[0021] Optionally, a capacitance absorption module electrically connected between the filter capacitor and the ground is further included.

[0022] Optionally, the constant current module includes a constant current chip, and the constant current chip model is one of OC5138, SN8651, SN8652, and TX6133.

[0023] The beneficial effects of the utility model are:

[0024] This application can effectively reduce circuit radiation, achieving low radiation and environmental friendliness. Specifically, it utilizes an anti-interference module to effectively absorb noise generated by the MOS switch within the constant current module, suppressing headlight radiation. The second RC absorption circuit and the first RC absorption circuit in the freewheeling module both absorb noise generated by the freewheeling diode and the switching noise within the constant current module, suppressing headlight radiation. This design is particularly suitable for high and low beam lighting on motorcycles and electric vehicles.

[0025] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0027] Figure 1 It is a principle structure block diagram of embodiment 1;

[0028] Figure 2 1 is a circuit diagram of embodiment 1. DETAILED DESCRIPTION

[0029] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0030] In the description of the present utility model, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0031] Example 1

[0032] like Figure 1 and Figure 2 As shown, this embodiment provides a lighting power supply circuit, which is particularly suitable for high beam lighting or low beam lighting. Specifically, the lighting power supply circuit includes: a power supply module, a constant current module, a freewheeling module, an anti-interference module, a power inductor L3, a current output control module and a filter capacitor C9.

[0033] The power supply module is electrically connected to the power supply to supply power to the lighting power supply circuit. The input end of the constant current module is electrically connected to the first output end of the power supply module to provide a constant current to the load. The input end of the freewheeling module is electrically connected to the second output end of the power supply module. The anti-interference module is electrically connected to the output end sw of the constant current module to suppress the noise generated by the constant current module. The input end of the power inductor L3 is electrically connected to the output end of the anti-interference module and the output end of the freewheeling module. The current output control module is electrically connected between the output current sampling end of the constant current module and the ground to adjust the output current of the constant current module. One end of the filter capacitor C9 is electrically connected to the second output end of the power supply module and the output end of the power inductor L3, and the other end of the filter capacitor C9 is electrically connected to the load LED to provide a stable current to the load LED.

[0034] In this embodiment, the power supply provides a 12V DC voltage. The anti-interference module is preferably, but not limited to, an anti-interference magnetic bead L4, which effectively absorbs noise generated by the MOS switch inside the constant current chip IC2, thereby suppressing headlight radiation. The power supply module includes a rectifier / anti-reverse connection module, a capacitor filter module, and an IC power supply module. The rectifier / anti-reverse connection module is preferably, but not limited to, a rectifier diode D3, the positive electrode of which is electrically connected to the power supply, and the cathode of which serves as the second output terminal of the power supply module. The capacitor filter module is preferably, but not limited to, a first filter capacitor C1 and a second filter capacitor C2 connected in parallel, electrically connected between the output terminal of the rectifier / anti-reverse connection module and ground, that is, between the cathode of the rectifier diode D3 and ground. The first filter capacitor C1 and the second filter capacitor C2 filter the input voltage, providing stability for the back-end output and supporting the efficient completion of subsequent energy conversion. The IC power supply module includes a first resistor R1, a second resistor R2, and a third capacitor C3. The first and second resistors R1 and R2 are connected in parallel, connected in series with the third capacitor C3, and then grounded. One end of the parallel resistors R1 and R2 is electrically connected to the output terminal of the rectifier / anti-reverse polarity module, namely, the cathode of the rectifier diode D3. The other end of the parallel resistors R1 and R2 forms the first output terminal of the power supply module and is electrically connected to the power supply terminal of the constant current module. The constant current module includes a constant current chip IC2. Pin 2 of the constant current chip IC2 has a 5.1V voltage regulator diode internally clamped at 5.1V. The IC power supply module normally supplies power to the constant current chip IC2, and the constant current chip IC2 begins operating internally. The third capacitor C3 filters the power supply to the constant current chip IC2, ensuring stable power supply and normal operation. When the input voltage fluctuates, the third capacitor C3 smooths the 5.1V voltage and stabilizes it, improving power supply capability. The constant current IC2 is preferably, but not limited to, any of the following: OC5138, SN8651, SN8652, or TX6133. The constant current IC2 is preferably, but not limited to, a buck constant current module. The internal structure of the IC2 and the corresponding pins, along with the effective use of external components, form a constant current topology. The power inductor L3 serves as both an energy storage and discharge function for this topology.

[0035] The freewheeling module includes a freewheeling diode D6 and a first RC snubber circuit. The first RC snubber circuit consists of a fourth capacitor C4 and a third resistor R3 connected in series. Freewheeling diode D6 and the first RC snubber circuit are connected in parallel between the second output terminal of the power supply module and the power inductor L3, specifically between the cathode of rectifier diode D3 and the power inductor L3. Freewheeling diode D6 discharges the energy stored in the power inductor L3, ensuring continued power to the LED load when the internal switch of constant current chip IC2 is disconnected. The fourth capacitor C4 and third resistor R3 in the first RC snubber circuit primarily absorb noise generated by the switching of freewheeling diode D6 and the internal switch of constant current chip IC2, thereby suppressing headlight radiation.

[0036] The current output control module includes a fifth resistor RS5 and a fourth resistor RS4 connected in parallel. The output current sampling terminal of the constant current chip IC2 has a voltage of 0.2V. The current is set to this voltage divided by the resistance of the fifth and fourth resistors RS5 and RS4 connected in parallel. Adjusting this resistance value can control the output current. Different chips have different maximum output powers.

[0037] In this embodiment, the lighting power supply circuit further includes a second RC absorption circuit electrically connected between the output terminal sw of the constant current module and ground. This second RC absorption circuit is composed of a sixth resistor R6 and a fifth capacitor C5 connected in series. It primarily absorbs noise generated by switching between the freewheeling diode D6 and the internal switching transistor of the constant current chip IC2, thereby suppressing radiation from the vehicle lights.

[0038] In addition, a capacitor absorption module is electrically connected between the filter capacitor C9 and the ground. In this embodiment, the capacitor absorption module is a sixth capacitor C6. The sixth capacitor C6 absorbs radiation to make the circuit radiation more stable.

[0039] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0040] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A lighting power supply circuit, characterized in that: include: A power supply module, electrically connected to a power source, to supply power to the lighting power supply circuit; a constant current module, the input end of which is electrically connected to the first output end of the power supply module, for providing a constant current to the load; a freewheeling module, an input end of which is electrically connected to the second output end of the power supply module; an anti-interference module, electrically connected to the output end of the constant current module, and suppressing the noise generated by the constant current module; A power inductor, whose input end is electrically connected to the output end of the anti-interference module and the output end of the freewheeling module, and whose output end is connected to a filter capacitor; A filter capacitor, one end of which is electrically connected to the second output end of the power supply module and the output end of the power inductor, and the other end of which is electrically connected to the load, provides a stable current for the load.

2. The lighting power supply circuit according to claim 1, characterized in that: The freewheeling module includes a freewheeling diode and a first RC absorption circuit: the freewheeling diode and the first RC absorption circuit are connected in parallel between the second output terminal of the power supply module and the power inductor.

3. The lighting power supply circuit according to claim 1, characterized in that: It also includes a second RC absorption circuit, which is electrically connected between the output end of the constant current module and the ground.

4. The lighting power supply circuit according to claim 1, characterized in that: The power supply module includes: A rectifier / anti-reverse connection module, whose input end is electrically connected to the power supply and whose output end is the second output end of the power supply module; A capacitor filter module is electrically connected between the output terminal of the rectification / anti-reverse connection module and the ground; IC power supply module; its input end is electrically connected to the output end of the rectification / anti-reverse connection module, and its output end is the first output end of the power supply module, which is electrically connected to the power supply end of the constant current module.

5. The lighting power supply circuit according to claim 1, characterized in that: It also includes a current output control module electrically connected between the output current sampling terminal of the constant current module and the ground, and the current output control module includes a first resistor and a second resistor connected in parallel.

6. The lighting power supply circuit according to claim 1, characterized in that: The anti-interference module is an anti-interference magnetic bead.

7. The lighting power supply circuit according to claim 1, characterized in that: It also includes a capacitance absorption module electrically connected between the filter capacitor and the ground.

8. The lighting power supply circuit according to claim 1, characterized in that: The constant current module includes a constant current chip, and the constant current chip model is one of OC5138, SN8651, SN8652, and TX6133.

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