CN201103810Y - LED lamp decoration with commutation and filtering device - Google Patents

Abstract

An LED festoon lighting with a rectifying and filtering device, which makes use of a rectifying and filtering device with a low-pass filter circuit arranged between the plug of the power supply and the LED lamp string to change the alternating current power supply input into the direct current power supply, and supplies the direct current power supply to light LED lamps so as to improve the luminous efficiency of the LED festoon lighting and reform the glare problem of LED lamps.

Description

LED lamp decoration with straightening and filtering unit

Technical field

The utility model relates to a kind of LED lamp decoration with straightening and filtering unit, refers to especially a kind ofly convert alternating current input power supplying to LED lamp decoration that dc source uses for the LED bulb, with luminous efficiency that improves the LED bulb and the optical issue of dazzling of improving the LED bulb.

Background technology

As shown in Figures 1 and 2, annual at Christmas or special red-letter day the time, every household all uses traditional LED lamp decoration 10 to be installed on Christmas tree or the door and window, make the atmosphere of celebrating a festival denseer.The structure of this traditional LED lamp decoration 10 comprises that a power cable 11 and this power cable 11 are provided with an attaching plug 12 and a group or more LED lamp string 15.Wherein, described every group of LED lamp string 15 is provided with the monochromatic or multi-colored led bulb of predetermined number, and the attaching plug 12 of described power cable 11 is used to connect AC power, to provide AC power to light to be connected the every LEDs bulb on every group of LED lamp string 15.

Yet well-known LED bulb is different with the conventional incandescent bulb, and the conventional incandescent bulb is to utilize the positive half-wave of AC power and filament that negative half-wave is lighted incandescent lamp bulb to produce simultaneously to throw light on.But the LED bulb is because the tool characteristic of semiconductor can only utilize the positive half-wave of AC power or negative half-wave emission light to produce illumination.

So, the flaw of tradition LED lamp decoration 10, can not utilize the positive half-wave of AC power and negative half-wave to light the LED bulb exactly simultaneously, in the use, except that the shortcoming that the great power loss is arranged, also have the problem of light flash during use, easily cause user's visual impression to receive uncomfortable feeling.

The utility model content

In order to overcome the shortcoming of traditional LED lamp decoration of the prior art, main purpose of the present utility model is promptly providing a kind of LED lamp decoration with straightening and filtering unit, utilize straightening and filtering unit to convert the AC power of input to dc source, and supplying DC power source is lighted the LED bulb, except the LED bulb luminous efficiency that improves the LED lamp decoration, also improve the flicker of LED bulb or dazzle optical issue.

For achieving the above object, the utility model provides a kind of LED lamp decoration of tool straightening and filtering unit, comprise: a power cable and a group or more parallel connection LED lamp string, described power cable is established an attaching plug, be used for input ac power, and every group of LED lamp string comprises that a plurality of monochromes or multi-colored led bulb constitute with described power cable and electrically connects, each group or wherein one group of LED lamp string be provided with a straightening and filtering unit, by diode D1, resistor R 1 and capacitor C1 form low-pass filter circuit jointly, and be connected with the attaching plug formation of described power cable, to convert dc source to from the AC power of attaching plug input, and supplying DC power source is lighted every LEDs bulb of pairing LED lamp string.

Preferably, in each group of described LED lamp decoration with straightening and filtering unit or wherein in one group of LED lamp string, set up LED safety bulb as current-limiting apparatus.

Preferably, in wherein one group of LED lamp string of described LED lamp decoration with straightening and filtering unit,, constitute with the attaching plug that offers another string LED lamp decoration and electrically to be connected in series by the socket device of a supply AC power is set.

The utility model can improve the LED bulb luminous efficiency of LED lamp decoration and improve the optical issue of dazzling of LED bulb.

Description of drawings

Fig. 1 is the schematic diagram of traditional LED lamp decoration, is used for illustrating that traditional LED lamp decoration is to use AC power to light the LED bulb but the LED bulb exists and dazzles optical issue;

Fig. 2 is the circuit diagram of traditional LED lamp decoration shown in Figure 1;

Fig. 3 is the stereogram with LED lamp decoration of straightening and filtering unit of the present utility model, be used for illustrating that LED lamp decoration of the present utility model is to utilize straightening and filtering unit to convert AC power to dc source, with luminous efficiency that improves the LED bulb and the optical issue of dazzling of improving the LED bulb;

Fig. 4 is to use the circuit diagram at the straightening and filtering unit of LED lamp decoration shown in Figure 3;

Fig. 5 is the schematic diagram of LED lamp decoration shown in Figure 3;

Fig. 6 is the circuit diagram of LED lamp decoration shown in Figure 3;

Fig. 7 is the second kind of specific embodiment schematic diagram that the utlity model has the LED lamp decoration of straightening and filtering unit;

Fig. 8 is the circuit diagram of LED lamp decoration shown in Figure 7;

Fig. 9 is that LED lamp decoration shown in Figure 7 is by setting up the circuit diagram that safe bulb is adjusted as current limliting;

Figure 10 is the third specific embodiment schematic diagram that the utlity model has the LED lamp decoration of straightening and filtering unit;

Figure 11 is the circuit diagram of LED lamp decoration shown in Figure 10;

Figure 12 is that LED lamp decoration shown in Figure 10 is by setting up the circuit diagram that safe bulb is adjusted as current limliting.

Reference numeral

10...... traditional LED lamp decoration 11...... power cable

12...... attaching plug 15......LED bulb

20......LED lamp decoration 21...... power cable

22...... attaching plug 23...... socket device

25......LED lamp string 25a......LED bulb

30...... straightening and filtering unit 40......LED safety bulb

The specific embodiment

Fig. 3 is to the first kind of specific embodiment that Figure 6 shows that LED lamp decoration 20 of the present utility model, comprise: a power cable 21, and described power cable 21 is provided with an attaching plug 22, to connect AC power and input ac power, one group of LED lamp string 25, monochromatic or multi-colored led bulb 25a and described power cable 21 by predetermined number are composed in series, an and straightening and filtering unit 30, it is connected between the attaching plug 22 and described LED lamp string 25 of described power cable 21, be used for and convert dc source to from the AC power of attaching plug 22 inputs, and supplying DC power source is lighted every LEDs bulb 25a of described LED lamp string 25.

As shown in Figure 4, described straightening and filtering unit 30 is a kind of low-pass filter circuit (lowpass filter), is made up of jointly diode D1, resistor R 1 and capacitor C1.When AC power is imported, AC power can be through the diode D1 rectification of straightening and filtering unit 30, again through the resistor R 1 of straightening and filtering unit 30 and capacitor C1 with pulsating current regular stable after, by the capacitor C1 of straightening and filtering unit 30 because of charging output DC source.So described straightening and filtering unit 30 has the function that AC power is converted to dc source, and have every monochrome providing effective dc source to light LED lamp string 25 or the function of multi-colored led bulb 25a.

In other words, after LED lamp decoration 20 of the present utility model is gone up AC power with attaching plug 22 connections, the straightening and filtering unit 30 of LED lamp decoration 20 of the present utility model is carried out the following step immediately, and supplying DC power source is lighted every LEDs bulb 25a of LED lamp string 25:

1. when AC power is input as positive half cycle, diode D1 conducting, the electric current of the diode D1 that flows through makes capacitor C1 charging through resistor R 1; Voltage (Vc) after the capacitor C1 charging reaches as high as the voltage peak (Vp) of AC power, that is, and and Vc=Vp.

2. during the voltage after the input voltage of AC power is less than capacitor C1 charging, not conducting of diode D1, at this moment, capacitor C1 begins every LEDs bulb 25a that supplying DC power source is given LED lamp string 25 according to time constant RC.

3. during the voltage after the input voltage of AC power is greater than capacitor C 1 discharge, diode D1 conducting again makes the voltage (Vc) of capacitor C1 be charged to Vp again, begins another cycle again.

4. the above-mentioned action that goes round and begins again, every LEDs bulb 25a of LED lamp string 25 will become positive-negative half-cycle in the AC power input and be with dc source and keep conducting and light under the effect of straightening and filtering unit 30.

In view of the above, the LED lamp decoration 20 shown in the utility model can improve the luminous efficiency of LED bulb 25a by set straightening and filtering unit 30, and can improve LED bulb 25a dazzle light or flicker problem.

Fig. 7 and Figure 8 shows that second kind of specific embodiment of the LED lamp decoration 20 shown in the utility model, roughly the same with first kind of concrete essential structure of implementing, but comprise one group of above LED lamp string 25, and constitute and be connected in parallel, and each group or one of them group LED lamp string 25 are provided with a straightening and filtering unit 30, and be connected between the attaching plug 22 and pairing LED lamp string 25 of described power cable 21, be used for and convert dc source to from the AC power of attaching plug 22 inputs, and supplying DC power source is lighted every LEDs bulb 25a of pairing LED lamp string 25.

As Figure 10 and shown in Figure 11, the third specific embodiment for LED lamp decoration 20 of the present utility model, roughly the same with second kind of concrete essential structure of implementing, but wherein one group of LED lamp string 25 also is provided with the socket device 23 of a supply AC power, can go here and there LED lamp decoration 20 of the present utility model for another and constitute electrical tandem compound.So this LED lamp decoration 20 of the present utility model can be connected in series use together with multi-string LED lamp decoration 20.

As Fig. 9 or shown in Figure 12, in first kind, second kind of the LED lamp decoration 20 shown in the utility model and the third specific embodiment, each group or one of them group LED lamp string 25 also can be set up LED safety bulb 40 and adjust the current-limiting apparatus of function as having current limliting, and constitute the different specific embodiments of the LED lamp decoration 20 shown in the utility model.

The above content that discloses, it is the preferable specific embodiment of the utility model, goal of the invention all and of the present utility model and the effect that can reach, constitute so-called equivalence or equalization, and belonging to those of ordinary skills can unlabored simple and easy modification, modification, improvement or variation, should not break away from the claim category that the utility model is contained opinion.

Claims (3)

1, a kind of LED lamp decoration with straightening and filtering unit, comprise a power cable and a group or more parallel connection LED lamp string, described power cable is provided with an attaching plug, be used for input ac power, and every group of LED lamp string comprises that a plurality of monochromes or multi-colored led bulb constitute with described power cable and electrically connects, it is characterized in that, each group or wherein one group of LED lamp string be provided with a straightening and filtering unit, this device is by diode D1, a kind of low-pass filter circuit of the common composition of resistor R 1 and capacitor C1, and be connected with the attaching plug formation of described power cable, be used for and convert dc source to from the AC power of described attaching plug input, and supplying DC power source is lighted every LEDs bulb of pairing LED lamp string.

2, the LED lamp decoration with straightening and filtering unit as claimed in claim 1 is characterized in that, described each group or wherein one group of LED lamp string also be provided with LED safety bulb as current-limiting apparatus.

3, the LED lamp decoration with straightening and filtering unit as claimed in claim 1 or 2 is characterized in that, described wherein one group of LED lamp string also is provided with one and supplies the socket device of AC power.

Images