High-power-factor linear constant-current dimming stroboflash-free circuit
By designing a high power factor linear constant current dimming circuit, combined with filtering, power factor control and flicker-free modules, the problem of low power factor of dimming filament lamp LED products is solved, achieving efficient energy utilization and cost reduction.
Patent Information
- Application Number
- CN202422608678.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-28
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2034-10-28
AI Technical Summary
Existing dimming filament LED products have a low power factor, making it difficult to meet the requirements of California CECTITLE 24JA8 regulations in North America. They also have complex structures and high costs.
A high power factor linear constant current dimming circuit is designed, including a filter module, a power factor control module, a constant current dimming module and a flicker-free module. A specific chip and capacitor combination is used to achieve a power factor value greater than 0.9 through resistance adjustment, and an input protection module is equipped to prevent component damage.
The power factor value is greater than 0.9, meeting the California CEC certification requirements. It is also flicker-free and compatible with Japanese dimming standards, simplifying the structure and reducing costs.
Smart Images
Figure CN223348826U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of LED light control, in particular to a high power factor linear constant current dimming circuit without flashover. Background Art
[0002] Power factor is a key technical indicator in electrical engineering, primarily used to measure the efficiency of electrical equipment or power systems. It refers to the ratio of active power to apparent power in an AC circuit. Under certain voltage and power conditions, the higher this value, the better the efficiency of a user's electrical equipment and the more fully utilized the power generation equipment. Ideally, this value should be close to 1, but in practice it is often lower.
[0003] Currently, the power factor of dimmable filament LED products on the market is generally around 0.7, while California CECTITLE 24JA8 regulations in North America require a power factor of 0.9 to ensure full utilization of the equipment used. However, the current domestic LED products that meet this power factor are complex and costly, hindering the effective development of the product. Summary of the Invention
[0004] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a high power factor linear constant current dimming circuit without flashover, which can achieve a power factor value greater than 0.9, meet the California CEC certification requirements, and also meet the stringent Japanese dimming compatibility requirements.
[0005] The utility model is realized through the following technical solutions:
[0006] A high power factor linear constant current dimming and flash-free circuit includes a filter module, a power factor control module, a constant current dimming module, a flicker-free module and an LED lamp, wherein the power factor control module includes a chip U1 with a model number of SM2082EG, the constant current dimming module includes a chip U2 with a model number of SM2082G, and the flicker-free module includes a chip U3 with a model number of VAS1001 and a capacitor C1; the output end of the filter module is respectively connected to the OUT end of the chip U3 and the Vin end of the chip U2, one end of the capacitor C1 is connected to the VC end of the chip U3, and the other end of the capacitor C1 is respectively connected to the GND end of the chip U3 and the positive electrode of the LED lamp, the negative electrode of the LED lamp is respectively connected to the NC end, OUT1 end and OUT2 end of the chip U1, the Vout end of the chip U2 is connected to the REXT1 end of the chip U1, and the GND end of the chip U2 is respectively connected to the GND1 end, GND2 end and REXT2 end of the chip U1.
[0007] The circuit further includes an input protection module, which includes a fuse resistor FR1 and a chip varistor RV1. The fuse resistor FR1 is connected to the live wire end of the filter module, and the chip varistor RV1 is connected in parallel with the output end of the filter module.
[0008] The constant current dimming module further includes a resistor R1 and a resistor R3. The two ends of the resistor R1 are respectively connected to the output end of the filter module and the Vin end of the chip U2. The two ends of the resistor R3 are respectively connected to the Vout end of the chip U2 and the REXT1 end of the chip U1.
[0009] Wherein, the resistor R3 is an adjustable resistor.
[0010] The power factor control module further includes a resistor R2 and a resistor R4. One end of the resistor R2 is connected to the REXT1 end of the chip U1. One end of the resistor R4 is connected to the REXT2 end of the chip U1. The resistor R2 and the resistor R4 are grounded respectively.
[0011] The resistor R2 and the resistor R4 are both adjustable resistors.
[0012] Beneficial effects of the utility model:
[0013] The utility model discloses a high power factor linear constant current dimming and flash-free circuit. By providing a filter module, a power factor control module, a constant current dimming module and a flash-free module, the power factor control module and the constant current dimming module are connected and combined to form a power factor control combination, achieving a power factor value greater than 0.9, meeting the California CEC certification requirements; at the same time, the provision of a flash-free module can also meet the stringent Japanese dimming compatibility requirements. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The present invention is further described with reference to the accompanying drawings. However, the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other drawings based on the following drawings without creative effort.
[0015] Figure 1 This is a circuit diagram of the utility model. DETAILED DESCRIPTION
[0016] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
[0017] Power factor is a key technical indicator in electrical engineering, primarily used to measure the efficiency of electrical equipment or power systems. It refers to the ratio of active power to apparent power in an AC circuit. Under certain voltage and power conditions, the higher this value, the better the efficiency of a user's electrical equipment and the more fully utilized the power generation equipment. Ideally, this value should be close to 1, but in practice it is often lower.
[0018] Currently, the power factor of dimmable filament LED products on the market is generally around 0.7, while California CECTITLE 24JA8 regulations in North America require a power factor of 0.9 to ensure full utilization of the equipment used. However, the current domestic LED products that meet this power factor are complex and costly, hindering the effective development of the product.
[0019] In order to solve the above problems, the present embodiment discloses a high power factor linear constant current dimming and flash-free circuit, including a filtering module, a power factor control module, a constant current dimming module, a flicker-free module and an LED lamp, wherein the power factor control module includes a chip U1 with a model number of SM2082EG, the constant current dimming module includes a chip U2 with a model number of SM2082G, and the flicker-free module includes a chip U3 with a model number of VAS1001 and a capacitor C1; the output end of the filtering module is respectively connected to the OUT end of the chip U3 and the Vin end of the chip U2, one end of the capacitor C1 is connected to the VC end of the chip U3, and the other end of the capacitor C1 is respectively connected to the GND end of the chip U3 and the positive pole of the LED lamp, the negative pole of the LED lamp is respectively connected to the NC end, OUT1 end and OUT2 end of the chip U1, the Vout end of the chip U2 is connected to the REXT1 end of the chip U1, and the GND end of the chip U2 is respectively connected to the GND1 end, GND2 end and REXT2 end of the chip U1.
[0020] Specifically, the utility model provides a high power factor linear constant current dimming and flash-free circuit, which is provided with a filter module, a power factor control module, a constant current dimming module and a flicker-free module. The power factor control module and the constant current dimming module are connected and combined to form a power factor control combination, thereby achieving a power factor value greater than 0.9 and meeting the California CEC certification requirements; at the same time, the flicker-free module can also meet the stringent Japanese dimming compatibility requirements.
[0021] Furthermore, the circuit includes an input protection module, which includes a fuse resistor FR1 and a chip varistor RV1. The fuse resistor FR1 is connected to the live terminal of the filter module, and the chip varistor RV1 is connected in parallel with the output terminal of the filter module. The fuse resistor FR1 adopts a 75R resistance design. On the one hand, it immediately blows in the event of overcurrent, protecting other components in the circuit from damage, and on the other hand, it can improve the power factor value. In addition, the AC power of the filter module is rectified into pulsating DC power, which is connected to the chip varistor RV1 in parallel with the positive and negative terminals of the filter module, providing surge absorption protection and protecting subsequent circuits from damage during peak surges.
[0022] Furthermore, the constant current dimming module also includes a resistor R1 and a resistor R3. The two ends of the resistor R1 are respectively connected to the output end of the filter module and the Vin end of the chip U2, and the two ends of the resistor R3 are respectively connected to the Vout end of the chip U2 and the REXT1 end of the chip U1. In this embodiment, the resistor R1 divides the output of the filter module and enters the Vin end of the chip U2. The GND end of the chip U2 is connected to the ground of the entire circuit. The Vout end is connected to the resistor R3 and enters the REXT1 pin of the chip U1, thereby realizing the connection combination of the U1 chip and the U2 chip to form a power factor control combination. In this embodiment, the resistor R3 is an adjustable resistor. By adjusting and reducing the value of the resistor R3, the power factor value can be improved.
[0023] Furthermore, the power factor control module also includes a resistor R2 and a resistor R4. One end of the resistor R2 is connected to the REXT1 terminal of the chip U1, and one end of the resistor R4 is connected to the REXT2 terminal of the chip U1. The resistors R2 and R4 are grounded. In this embodiment, the resistors R2 and R4 are both adjustable resistors. The resistor R2 implements the dimming current adjustment function, and the resistor R4 can adjust the power level of the entire circuit drive.
[0024] Furthermore, the U3 chip and capacitor C1 form a flicker-free module. The output end of the filter module is connected to the OUT pin of the chip U3 after the diode D1 continues the current. The U3 chip is connected to the capacitor C1 with a resistance of 10uF. Combined with the electrolytic capacitor, it suppresses the pulsating DC ripple and converts it into a smooth DC power, which plays a role in removing ripples and meets the flicker-free requirements.
[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit the scope of protection of the utility model. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the utility model.
Claims
1. A high power factor linear constant current dimming circuit without flashover, characterized in that: It includes a filter module, a power factor control module, a constant current dimming module, a flicker-free module and an LED lamp. The power factor control module includes a chip U1 with a model number of SM2082EG, the constant current dimming module includes a chip U2 with a model number of SM2082G, and the flicker-free module includes a chip U3 with a model number of VAS1001 and a capacitor C1. The output end of the filtering module is respectively connected to the OUT end of the chip U3 and the Vin end of the chip U2, one end of the capacitor C1 is connected to the VC end of the chip U3, the other end of the capacitor C1 is respectively connected to the GND end of the chip U3 and the positive pole of the LED lamp, the negative pole of the LED lamp is respectively connected to the NC end, OUT1 end and OUT2 end of the chip U1, the Vout end of the chip U2 is connected to the REXT1 end of the chip U1, and the GND end of the chip U2 is respectively connected to the GND1 end, GND2 end and REXT2 end of the chip U1.
2. A high power factor linear constant current dimming circuit without flashover according to claim 1, characterized in that: The circuit further includes an input protection module, which includes a fuse resistor FR1 and a patch varistor RV1. The fuse resistor FR1 is connected to the live wire end of the filter module, and the patch varistor RV1 is connected in parallel with the output end of the filter module.
3. The high power factor linear constant current dimming circuit without flashover according to claim 1, characterized in that: The constant current dimming module further includes a resistor R1 and a resistor R3. The two ends of the resistor R1 are respectively connected to the output end of the filter module and the Vin end of the chip U2. The two ends of the resistor R3 are respectively connected to the Vout end of the chip U2 and the REXT1 end of the chip U1.
4. The high power factor linear constant current dimming circuit without flashover according to claim 3, characterized in that: The resistor R3 is an adjustable resistor.
5. The high power factor linear constant current dimming circuit without flashover according to claim 1, characterized in that: The power factor control module further includes a resistor R2 and a resistor R4. One end of the resistor R2 is connected to the REXT1 end of the chip U1. One end of the resistor R4 is connected to the REXT2 end of the chip U1. The resistor R2 and the resistor R4 are grounded respectively.
6. The high power factor linear constant current dimming circuit without flashover according to claim 5, characterized in that: The resistor R2 and the resistor R4 are both adjustable resistors.