CN201995170U

CN201995170U - Large power light-emitting diode (LED) constant power source

Info

Publication number: CN201995170U
Application number: CN2011200083307U
Authority: CN
Inventors: 秦传保; 汪劲松; 毛明权
Original assignee: CHAOHU KAIDA LIGHTING TECHNOLOGY Co Ltd
Current assignee: CHAOHU KAIDA LIGHTING TECHNOLOGY Co Ltd
Priority date: 2011-01-12
Filing date: 2011-01-12
Publication date: 2011-09-28
Anticipated expiration: 2021-01-12

Abstract

The utility model discloses a large power light-emitting diode (LED) constant power source, belonging to the technical field of a power source device. The large power LED constant power source comprises a filtering rectifying circuit, a transformer, a driving integrated block and a single chip machine; wherein the input end of the single chip machine (IC2) is connected with a sampling resistors (R3, R5) connected serially in a first secondary output circuit of the transformer (T2) and a the sampling resistors (R3, R5) connected and in a first secondary output circuit of the transformer (T2) in parallel respectively, the output end of the single chip machine is connected with the control pin of the driving integrated block (IC1) serially connected with the primary coil of the transformer. As the output voltage and current of the transformer is sampled and computed by the single chip machine, and the control voltage is output to control the driving frequency of the driving integrated block serially connected with the primary coil of the transformer, so that the output power of the transformer is controlled, and the output power is constant, thereby ensuring the stable operation of an LED bulb and the best state of brightness.

Description

The great power LED constant-power power source

Technical field

The utility model relates to a kind of great power LED constant-power power source, belongs to the supply unit technical field.

Background technology

The high-powered LED lamp power supply is to allow a kind of device of LDE bulb steady operation.The great power LED power supply has two kinds in the market: a kind of is constant voltage source, and another is a constant-current supply.Because the voltage-current characteristic of LED is not changeless, but along with variation of temperature changes, so when using constant voltage source, can not guarantee that just electric current is constant, thereby be easy to cause the quick light decay of high-power bulb, so constant voltage source is worthless.Though constant-current supply can make LED bulb steady operation, because the voltage-current characteristic of each LED is not duplicate, so power output also has error, its brightness can not get best performance.

The utility model content

The purpose of this utility model is to provide a kind of great power LED constant-power power source that can make the LED steady operation and obtain preferable brightness.

Its technical scheme is: a kind of great power LED constant-power power source, comprise filter rectifier, transformer, driving integrated package and single-chip microcomputer, it is characterized in that: the input of described single-chip microcomputer respectively with in parallel be connected on first level output circuit of transformer in sampling resistor be connected, the output of single-chip microcomputer is connected with the control pin pin of driving integrated package on being serially connected in transformer.

Its technique effect is: owing to adopt single-chip microcomputer to the calculating of sampling of the output voltage of transformer and electric current, and output control voltage control is serially connected in the driving frequency of the driving integrated package on the transformer, thereby realized control to the transformer power output, make power output constant, guaranteed the steady operation of LED bulb and the best performance of brightness; And its circuit is simple, and cost is low.

Description of drawings

Fig. 1 is an electrical schematic diagram of the present utility model.

Embodiment

As shown in Figure 1, the great power LED constant-power power source comprises filter rectifier, transformer, driving integrated package and single-chip microcomputer.The input of single-chip microcomputer IC2 (PIC16F716) respectively with in parallel be connected on first level output circuit of transformer T2 in sampling resistor R3, R5 be connected, the output of single-chip microcomputer is connected with 3 pin control pins of driving ic chip 1 (VIPER22A) on being serially connected in transformer.

The interface of single-chip microcomputer IC2 connects the pressure limiting circuit by resistance R S and electric capacity ground connection in parallel, with the output ceiling voltage of first level of control transformer.

The transformer two ends are parallel with the peak voltage that is made of resistance R 1, capacitor C 2 and diode D1 and absorb circuit, to absorb the peak voltage that drives on the integrated package.

Drive ic chip 1 operating voltage supply with after by transformer T2 second subprime output by the current rectifying and wave filtering circuit that constitutes by diode D3, resistance R 2 and capacitor C 3.

Its course of work: alternating voltage is by elementary to transformer of output 300V left and right sides direct voltage behind the filter rectification, first required voltage and current of level output LED.When be connected in parallel on first time in the level output circuit voltage sample resistance R 3 and be connected on first current sampling resistor R5 in the level output circuit adopt output voltage or electric current when changing, promptly input to single-chip microcomputer IC2, single-chip microcomputer calculates through contrast, output control voltage control is serially connected in the driving frequency of the driving integrated package on the transformer, thereby realize control, make power output constant the transformer power output.

Claims

1. A high-power LED constant power supply, comprising filter rectifier circuit, transformer, drive integrated block and single-chip microcomputer, is characterized in that: the input terminal of described single-chip microcomputer (IC2) is respectively connected in parallel and in series with transformer (T2) for the first time The sampling resistors (R3, R5) in the stage output circuit are connected, and the output terminal of the single-chip microcomputer is connected with the control pin of the driving integrated block (IC1) connected in series on the primary coil of the transformer.

2. The high-power LED constant power power supply according to claim 1, characterized in that: the interface of the single-chip microcomputer (IC2) is connected with a voltage limiting circuit connected in parallel with a resistor (RS) and a capacitor (C5).

3. The high-power LED constant power power supply according to claim 1, characterized in that: the two ends of the primary coil of the transformer (T2) are connected in parallel with a peak composed of a resistor (R1), a capacitor (C2) and a diode (D1) voltage sink circuit.