CN1688186A - Driving circuit for 220V AC LED lamp - Google Patents

Abstract

The invention discloses a driving circuit of a 220V AC LED lamp, which belongs to the application of electronic technology in the lighting field. The drive circuit of the 220V AC LED lamp of the present invention includes a rectification circuit. The AC side of the rectifier circuit is connected in series with a step-down current limiting circuit composed of an inductance coil; the DC side of the rectifier circuit is connected in parallel with a filter circuit composed of a capacitor, a voltage limiting protection circuit composed of a Zener diode and an LED array. The rectifier circuit consists of a diode rectifier bridge. The LED array can be formed by connecting multiple LEDs in series; the LED array can also be formed by connecting multiple LEDs in series and then connecting them in parallel. The invention has the advantages of simple circuit, high reliability, low cost, no debugging, good manufacturability and high power saving efficiency; the inductance has the function of reducing voltage and limiting current, and is reliable and durable; after rectification and filtering, the LED array can be driven to avoid LED light emission The flickering feeling, the light intensity is stable and soft.

Description

220V AC LED lamp drive circuit

technical field

The invention relates to the lighting field, in particular to a circuit of a lighting lamp used in daily life.

Background technique

Semiconductor light-emitting diodes (LEDs) are rapidly gaining popularity and application due to their high efficiency, long life, safety, and environmental protection, which are incomparable to other light sources. However, LEDs require low-voltage DC power supply and cannot be directly connected to the daily 220V AC power supply. A special ballast circuit is required. . Many people have designed various 220V AC LED lamp drive circuits, and even special integrated circuits have appeared. Such as "LED lighting driver" (Chinese patent, application number: 01252414.X), "LED ultra-wide voltage driver" (Chinese patent, application number: 00255776.2), "LED lighting driver" (Chinese patent, application number: 00255776.2) proposed by Lin Wenwen. Application No.: 03254582.7), these circuits are complex, low in efficiency, poor in reliability, and high in cost; Xu Yongxiang's "A LED Drive Circuit Structure Improvement" (Chinese Patent, Application No.: 03252283.5) uses capacitor rectification, and the output current is unstable , poor reliability; Zhai Zhongyi's "AC power supply LED lamps" (Chinese patent, application number: 200420024504.9), adopts the resistance step-down method, the output current is unstable, and the efficiency is poor; and the application-specific integrated circuit is used, such as the HV9910 of SUPERTEX company. The LED lamp driving circuit of the current generation is actually a switching power supply circuit, which is easy to cause interference to the power grid, the circuit is complicated, and the cost is high.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the above-mentioned prior art and provide an LED lamp driving circuit based on inductive coil ballasting.

In order to solve the above technical problems, the drive circuit of the 220V AC LED lamp of the present invention includes a rectification circuit. The AC side of the rectifier circuit is connected in series with a step-down current limiting circuit composed of an inductance coil; the DC side of the rectifier circuit is connected in parallel with a filter circuit composed of a capacitor, a voltage limiting protection circuit composed of a Zener diode and an LED array.

The rectification circuit is composed of a diode rectification bridge.

The LED array is formed by a plurality of LEDs connected in series.

The LED array is formed by connecting multiple LEDs in series and then in parallel.

Compared with the prior art, the present invention has the following beneficial effects: (1) the advantages of simple circuit, high reliability, low cost, no need for debugging, good manufacturability and high power-saving efficiency; Current effect, reliable and durable, higher switchability than capacitor step-down method or switching power supply method, and low cost, simple and easy to manufacture; (3) driving the LED array after rectification and filtering can avoid the flickering feeling of LED light, and the light intensity Steady and soft.

Description of drawings

Fig. 1 is the schematic diagram of the driving circuit of the 220V AC LED lamp of the present invention;

Fig. 2 is an embodiment of the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings.

Embodiment of the driving circuit of the 220V AC LED lamp of the present invention:

As shown in Figure 2, the step-down current-limiting circuit uses an inductance coil L to convert the 220V AC into a low-voltage low-current (current-limiting) output. After passing through the rectifier circuit composed of rectifier bridges D1~4 to obtain DC, and then filtering through the filter capacitor C to obtain A more stable DC output to the LED array, in which the voltage limiting protection circuit is realized by the Zener diode Dz, the voltage stabilization value of the selected Zener diode Dz is slightly higher than the working voltage of the LED array, and Dz is in the cut-off state in the normal working state. In the event of an accident, it can avoid damage to the LED array and filter capacitor due to excessive output voltage.

Since the inductance has the effect of stepping down and limiting the current, and is reliable and durable, it is more reliable than the way of stepping down with a capacitor or a switching power supply, and the cost is low, and it is simple and easy to manufacture. After rectification and filtering, the LED array is driven, which can avoid the flickering feeling of LED light, and the light intensity is stable and soft.

Claims (4)

1. A drive circuit for a 220V AC LED lamp, comprising a rectifier circuit, characterized in that the AC side of the rectifier circuit is connected in series with a step-down current-limiting circuit composed of an inductance coil; the DC side of the rectifier circuit is connected in parallel with a A filter circuit composed of capacitors, a voltage limiting protection circuit composed of Zener diodes and an LED array. 2. The driving circuit of a 220V AC LED lamp according to claim 1, wherein the rectification circuit is composed of a diode rectification bridge. 3. The driving circuit of a 220V AC LED lamp according to claim 1, wherein the LED array is composed of a plurality of LEDs connected in series. 4. The driving circuit of a 220V AC LED lamp according to claim 1, wherein the LED array is formed by connecting a plurality of LEDs in series and then in parallel.

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