A circuit for low cost flicker-free filament

Abstract

The utility model relates to the technical field of no frequency flash illumination, specifically relates to a circuit for low -cost no frequency flash filament, this circuit includes RC power module, rectifier filter module and frequency flash removal module, its characteristics are that RC resistance -capacity step -down circuit is used to match light source 200V output voltage, realize reaching highest power supply efficiency to 99%, and innovatively set up frequency flash removal circuit in this design to realize the functional requirement of no frequency flash of bulb, and the circuit design is simple, meets the energy -efficiency requirement and no frequency flash functional requirement of A type bulb with very low cost, and the design is simple, the function is outstanding, high conversion efficiency and can realize the function of no frequency flash.

Description

Technical Field

[0001] This utility model relates to the field of flicker-free lighting technology, specifically to a circuit for a low-cost flicker-free filament. Background Technology

[0002] Power efficiency is a key technical indicator in electrical engineering, primarily used to measure the energy conversion efficiency of a power supply, referring to the ratio of input electrical energy to output electrical energy. With the implementation of the new ERP regulations, light bulbs are classified into seven different energy efficiency levels: A, B, C, D, E, F, and G. Products with higher energy efficiency levels save more energy during use and are therefore more popular with consumers. Besides the luminous efficacy of the light source itself, the most important factor determining a light bulb's energy efficiency level is the conversion efficiency of the power supply driver. Higher power efficiency results in higher overall luminous efficacy for the bulb, making it easier to achieve the highest A-level energy efficiency standard. Against this backdrop, the market urgently needs a driver solution that can meet high energy efficiency standards while maintaining controllable costs. Summary of the Invention

[0003] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this utility model is to provide a circuit for low-cost flicker-free filaments, which has a simple structure, extremely low cost, extremely high conversion efficiency and can achieve flicker-free function.

[0004] This utility model is achieved through the following technical solution:

[0005] A circuit for a low-cost, flicker-free filament lamp, comprising:

[0006] An RC power module, including a capacitor CX1 connected in series with the AC neutral line N input terminal;

[0007] The rectifier and filter module includes a bridge rectifier DB1 and an electrolytic capacitor E1; the AC input terminal of the bridge rectifier DB1 is connected to the other end of the capacitor CX1 and the AC live wire L input terminal respectively, and the electrolytic capacitor E1 is connected in parallel between the DC output terminals of the bridge rectifier DB1.

[0008] And a flicker removal module, including a flicker removal chip U1 and a capacitor C1; the flicker removal chip U1 is connected in series in the DC output circuit of the rectifier filter module, and the capacitor C1 is connected between the control pin G and the source S of the flicker removal chip U1.

[0009] It also includes an input protection module, which consists of at least one fuse resistor F1 connected to the input terminal of the AC live wire L.

[0010] The RC power module also includes a discharge resistor R2 and a resistor R3 connected in parallel across the capacitor CX1.

[0011] The rectifier and filter module also includes a discharge resistor R1 connected in parallel across the electrolytic capacitor E1.

[0012] Among them, the capacitor CX1 is an adjustable capacitor, and its capacitance value can be adjusted from 224J to 784J.

[0013] The source S of the flicker-eliminating chip U1 is connected to the DC bus where the electrolytic capacitor E1 is located. When the circuit is powered on, the capacitor C1 stores energy to trigger the flicker-eliminating chip U1 to work and eliminate low-frequency ripple current.

[0014] The flicker removal chip U1 is model MT7641BR.

[0015] The circuit is designed on a PCB with a diameter of 21mm.

[0016] The beneficial effects of this utility model are:

[0017] This invention discloses a circuit for low-cost, flicker-free filaments. By employing an RC power module to directly drive the high-voltage filament string, it eliminates the need for magnetic components and complex control circuits required by traditional switching power supplies, greatly simplifying the design and reducing material costs. At the same time, this simple structure avoids switching losses, effectively improving the power supply's conversion efficiency and easily meeting the requirements of Class A energy efficiency products. Attached Figure Description

[0018] The present invention will be further described with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present invention. For those skilled in the art, other drawings can be obtained based on the following drawings without creative effort.

[0019] Figure 1 This is the schematic diagram of the circuit of this utility model. Detailed Implementation

[0020] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0021] like Figure 1 As shown, this embodiment discloses a circuit for low-cost flicker-free filament lamps, which includes:

[0022] An RC power module, including a capacitor CX1 connected in series with the AC neutral line N input terminal;

[0023] The rectifier and filter module includes a bridge rectifier DB1 and an electrolytic capacitor E1; the AC input terminal of the bridge rectifier DB1 is connected to the other end of the capacitor CX1 and the AC live wire L input terminal respectively, and the electrolytic capacitor E1 is connected in parallel between the DC output terminals of the bridge rectifier DB1.

[0024] And a flicker removal module, including a flicker removal chip U1 and a capacitor C1; the flicker removal chip U1 is connected in series in the DC output circuit of the rectifier filter module, and the capacitor C1 is connected between the control pin G and the source S of the flicker removal chip U1.

[0025] In this embodiment, the circuit further includes an input protection module, which consists of at least one fuse resistor F1 connected to the input terminal of the AC live wire L. The fuse resistor F1 is designed with a resistance value of 10R, which serves two purposes: firstly, to melt in time during overcurrent to protect other components in the circuit from damage; and secondly, to ensure that the power efficiency design is not affected.

[0026] In this embodiment, capacitor CX1 is an adjustable capacitor with an adjustable capacitance value ranging from 224J to 784J. By adjusting the capacitance value of CX1, products with different power ratings can be calculated. Its working principle is to use the capacitive reactance generated by capacitor CX1 at a certain AC signal frequency to limit the maximum operating current. The RC power module also includes a discharge resistor R2 and a resistor R3 connected in parallel across capacitor CX1. When the power is off, the electrical energy in the capacitor can be consumed in resistors R2 and R3.

[0027] In this embodiment, the bus of the bridge rectifier DB1 is connected to an electrolytic capacitor E1. The electrolytic capacitor E1 is connected to the source (S) stage of the chip U1 after passing through the bus. The bridge rectifier DB1 converts AC power into pulsating DC power, but still has a certain AC component. The DC power is then filtered by the electrolytic capacitor E1 to obtain a purer DC power.

[0028] In this embodiment, the flicker-eliminating chip U1 is model MT7641BR. Chip U1 is a flicker-free chip, which, together with electrolytic capacitor E1, forms a flicker-eliminating module. This module is innovatively integrated into the circuit of this embodiment. Through the selection and matching of components, a power conversion efficiency of up to 99% can be achieved, while meeting the product function of flicker-free operation. The rectifier and filter module also includes a discharge resistor R1 connected in parallel across the electrolytic capacitor E1. Capacitor C1 is connected to the source and gate of chip U1. It stores energy at the moment the product is powered on, triggering chip U1 to work, which can eliminate low-frequency ripple current and eliminate LED flicker.

[0029] In this embodiment, the circuit is designed on a PCB with a diameter of 21mm, which meets the assembly requirements of E26 / E27 filament lamps and has excellent performance.

[0030] In summary, the circuit for low-cost flicker-free filaments in this embodiment eliminates the need for magnetic components and complex control circuits required by traditional switching power supplies by using an RC power module to directly drive the high-voltage filament string, greatly simplifying the design and reducing material costs. At the same time, this simple structure avoids switching losses, effectively improves the power supply conversion efficiency, and can easily meet the requirements of Class A energy efficiency products.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A circuit for low-cost flicker-free filament lamps, characterized in that, include: An RC power module, including a capacitor CX1 connected in series with the AC neutral line N input terminal; The rectifier and filter module includes a bridge rectifier DB1 and an electrolytic capacitor E1; the AC input terminal of the bridge rectifier DB1 is connected to the other end of the capacitor CX1 and the AC live wire L input terminal respectively, and the electrolytic capacitor E1 is connected in parallel between the DC output terminals of the bridge rectifier DB1. And a flicker removal module, including a flicker removal chip U1 and a capacitor C1; the flicker removal chip U1 is connected in series in the DC output circuit of the rectifier filter module, and the capacitor C1 is connected between the control pin G and the source S of the flicker removal chip U1.

2. The circuit for a low-cost flicker-free filament according to claim 1, characterized in that, It also includes an input protection module, which consists of at least one fuse resistor F1 connected to the input terminal of the AC live wire L.

3. The circuit for a low-cost flicker-free filament according to claim 1, characterized in that, The RC power module also includes a discharge resistor R2 and a resistor R3 connected in parallel across the capacitor CX1.

4. The circuit for a low-cost flicker-free filament according to claim 1, characterized in that, The rectifier and filter module also includes a discharge resistor R1 connected in parallel across the electrolytic capacitor E1.

5. The circuit for a low-cost flicker-free filament according to claim 1, characterized in that, The capacitor CX1 is an adjustable capacitor with an adjustable value range of 224J to 784J.

6. A circuit for a low-cost flicker-free filament according to claim 1 or 4, characterized in that, The source S of the flicker-eliminating chip U1 is connected to the DC bus where the electrolytic capacitor E1 is located. When the circuit is powered on, the capacitor C1 stores energy to trigger the flicker-eliminating chip U1 to work and eliminate low-frequency ripple current.

7. A circuit for a low-cost, flicker-free filament according to claim 6, characterized in that, The flicker-eliminating chip U1 is model MT7641BR.

8. A circuit for a low-cost, flicker-free filament according to claim 1, characterized in that, The circuit was designed on a PCB with a diameter of 21mm.

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