CN217770414U

CN217770414U - Phase-cut dimming LED driven filter circuit

Info

Publication number: CN217770414U
Application number: CN202122419813.2U
Authority: CN
Inventors: 郑德华; 方乙周
Original assignee: Zhuhai Shengchang Electronics Co ltd
Current assignee: Zhuhai Shengchang Electronics Co ltd
Priority date: 2021-10-09
Filing date: 2021-10-09
Publication date: 2022-11-08
Anticipated expiration: 2031-10-09

Abstract

The utility model provides a compatible can good phase cut LED driven filter circuit of adjusting luminance. The utility model discloses an alternating current is connected with EMI filter circuit's input electricity after the chopper through the tangent line dimmer, EMI filter circuit's output is connected with rectifier bridge's alternating current input end, rectifier bridge's the positive pole of direct current output end is connected with one end of inductance, the other end of inductance is connected with an input of tangential dimmer circuit, the both ends of first resistance are connected with the both ends of inductance, the both ends of diode are connected with the both ends of inductance; the other end of the inductor is also connected with one end of a second resistor and one end of a second capacitor, the other end of the second resistor is connected with one end of a first capacitor, and the other input end of the tangential dimming circuit, the negative pole of the direct current output end of the rectifier bridge, the other end of the first capacitor and the other end of the second capacitor are all grounded. The utility model discloses be applied to the technical field of the LED driven filter circuit of adjusting luminance of cutting mutually.

Description

Phase-cut dimming LED driven filter circuit

Technical Field

The utility model relates to a filter circuit, in particular to phase-cut adjusts luminance LED driven filter circuit.

Background

With the rapid development of the LED illumination industry, the LED lamps are used for every household and outdoor illumination at present, so that the LED driving market is developed vigorously, and the requirements on LED driving are higher and higher; in practical applications today, many LED drivers are already sold around the world. Because each country has various phase-cut dimmers, the same LED drive can not be well compatible with various dimmers, and the terminal use experience is poor. Or the manufacturer designs many different models of LED drivers for phase-cut dimmers in each country, which leads the manufacturer to overstock the inventory. Therefore, it is necessary to develop a filter circuit for driving a phase-cut dimming LED with good compatibility.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that overcome prior art not enough, provide a compatible performance good looks of cutting adjusts luminance LED driven filter circuit.

The utility model adopts the technical proposal that: the utility model comprises an EMI filter circuit, a rectifier bridge, an inductor, a first resistor, a diode, a second resistor, a first capacitor and a second capacitor; the alternating current is electrically connected with the input end of the EMI filter circuit after being chopped by the tangent dimmer, the output end of the EMI filter circuit is connected with the alternating current input end of the rectifier bridge, the positive electrode of the direct current output end of the rectifier bridge is connected with one end of the inductor, the negative electrode of the direct current output end of the rectifier bridge is grounded, the other end of the inductor is connected with one input end of the tangential dimming circuit, the other input end of the tangential dimming circuit is grounded, two ends of the first resistor are connected with two ends of the inductor, and two ends of the diode are connected with two ends of the inductor; the other end of the inductor is further connected with one end of the second resistor and one end of the second capacitor, the other end of the second resistor is connected with one end of the first capacitor, and the other end of the first capacitor and the other end of the second capacitor are both grounded; and the output end of the tangential dimming circuit is used as the power supply input end of the external lamp.

Further, the diode is a TVS diode.

Further, the rectifier bridge is a full-wave bridge rectifier circuit.

The utility model has the advantages that: after the alternating current is chopped by the tangent dimmer, an electric signal is input into the EMI filter circuit through an input end in front of the EMI filter circuit, then the electric signal is transmitted to the inductor through the rectifier bridge, filtered by the first capacitor and finally transmitted to the phase-cut dimming circuit. Due to the characteristics of the inductive component, the inductor generates oscillating peak voltage. The first resistor and the TVS diode can reduce the peak voltage of the generated oscillation, so that the voltage is maintained within a safe range. The second resistor, the first capacitor and the second capacitor are used for providing a stable working maintaining current for the phase-cut dimmer. Finally, a relatively clean voltage is output to the phase-cut dimming circuit. The LC filter circuit and the RC filter circuit have the function of improving the power factor, can reduce partial higher harmonic components and the peak voltage of oscillation, reduce electromagnetic interference and improve the electromagnetic anti-interference capacity, can obtain better electromagnetic compatibility, and ensure the compatibility of most phase-cut light modulators on the market.

Drawings

Fig. 1 is a circuit diagram of the present invention.

Detailed Description

As shown in fig. 1, in the present embodiment, the present invention includes an EMI filter circuit, a rectifier bridge DB1, an inductor L101, a first resistor R101, a diode D101, a second resistor R102, a first capacitor C101, and a second capacitor C102; the alternating current is electrically connected with the input end of the EMI filter circuit after being chopped by the tangential dimmer, the output end of the EMI filter circuit is connected with the alternating current input end of the rectifier bridge DB1, the positive electrode of the direct current output end of the rectifier bridge DB1 is connected with one end of the inductor L101, the negative electrode of the direct current output end of the rectifier bridge DB1 is grounded, the other end of the inductor L101 is connected with one input end of the tangential dimming circuit, the other input end of the tangential dimming circuit is grounded, two ends of the first resistor R101 are connected with two ends of the inductor L101, and two ends of the diode D101 are connected with two ends of the inductor L101; the other end of the inductor L101 is further connected to one end of the second resistor R102 and one end of the second capacitor C102, the other end of the second resistor R102 is connected to one end of the first capacitor C101, and the other ends of the first capacitor C101 and the second capacitor C102 are both grounded; and the output end of the tangential dimming circuit is used as the power supply input end of the external lamp.

In this embodiment, a capacitor having a relatively large capacity is connected to the rear of the rectifier circuit, and the rectified pulsating dc voltage is converted into a relatively stable dc voltage by using the charge/discharge characteristics thereof.

In this embodiment, the diode D101 is a TVS diode. The TVS diode is a transient voltage suppression diode, is an electronic part for protection, and can protect electrical equipment from being damaged by voltage spikes introduced by a lead.

In this embodiment, the rectifier bridge DB1 is a full-wave bridge rectifier circuit.

The utility model discloses a theory of operation: when the system is powered on, the power supply circuit is connected with the phase-cut light modulator through an input live wire L, an alternating current input voltage is transmitted to the EMI filter circuit through an output terminal of the phase-cut light modulator and an input zero line terminal N, the alternating current input voltage is rectified by the rectification filter circuit, and after the alternating current input voltage is processed by the phase-cut light modulator circuit, a positive pole and a negative pole of a direct current voltage are output to serve as power supply input ends of external lamps. Due to the characteristics of the inductive component, the inductor generates oscillating peak voltage. The first resistor and the TVS diode can reduce the peak voltage of the generated oscillation, so that the voltage is maintained in a safe range. The second resistor, the first capacitor and the second capacitor are used for providing a stable working maintaining current for the phase-cut dimmer. Finally, a relatively clean voltage is output to the phase-cut dimming circuit. The LC filter circuit and the RC filter circuit have the function of improving the power factor, can reduce partial higher harmonic components and the peak voltage of oscillation, reduce electromagnetic interference and improve the electromagnetic anti-interference capacity, can obtain better electromagnetic compatibility, and ensure the compatibility of most phase-cut light modulators on the market.

While the embodiments of the present invention have been described in terms of practical embodiments, they are not intended to limit the scope of the invention, and modifications and combinations with other embodiments will be apparent to those skilled in the art in light of the description.

Claims

1. The utility model provides a phase cut LED driven filter circuit of adjusting luminance which characterized in that: the filtering circuit driven by the phase-cut dimming LED comprises an EMI filtering circuit, a rectifier bridge (DB 1), an inductor (L101), a first resistor (R101), a diode (D101), a second resistor (R102), a first capacitor (C101) and a second capacitor (C102); the alternating current is electrically connected with the input end of the EMI filter circuit after being chopped by the tangential dimmer, the output end of the EMI filter circuit is connected with the alternating current input end of the rectifier bridge (DB 1), the positive electrode of the direct current output end of the rectifier bridge (DB 1) is connected with one end of the inductor (L101), the negative electrode of the direct current output end of the rectifier bridge (DB 1) is grounded, the other end of the inductor (L101) is connected with one input end of the tangential dimming circuit, the other input end of the tangential dimming circuit is grounded, two ends of the first resistor (R101) are connected with two ends of the inductor (L101), and two ends of the diode (D101) are connected with two ends of the inductor (L101); the other end of the inductor (L101) is further connected with one end of the second resistor (R102) and one end of the second capacitor (C102), the other end of the second resistor (R102) is connected with one end of the first capacitor (C101), and the other end of the first capacitor (C101) and the other end of the second capacitor (C102) are both grounded; and the output end of the tangential dimming circuit is used as the power supply input end of the external lamp.

2. The filter circuit for driving a phase-cut dimming LED according to claim 1, wherein: the diode (D101) is a TVS diode.

3. The filter circuit of claim 1, wherein the filter circuit comprises: the rectifier bridge (DB 1) is a full-wave bridge rectifier circuit.