CN201114882Y

CN201114882Y - A driving circuit for improved universal LED lighting bulb

Info

Publication number: CN201114882Y
Application number: CNU2007200551813U
Authority: CN
Inventors: 樊邦弘
Original assignee: Heshan Lide Electronic Enterprise Co Ltd
Current assignee: Heshan Lide Electronic Enterprise Co Ltd
Priority date: 2007-08-03
Filing date: 2007-08-03
Publication date: 2008-09-10
Anticipated expiration: 2017-08-03

Abstract

The utility model relates to a circuit, in particular to a universal LED illumination bulb drive circuit with an improved structure, which comprises a voltage-reducing capacitor, a rectifying circuit, a filtering capacitor and an LED bulb connected with the filtering capacitor in parallel; wherein, an adjustable resistor is connected in series between the DC output pole of the rectifying circuit and the filtering capacitor; the resistance value of the resistor is regulated according to the power of the LED bulb so as to provide the actual current value needed by the LED bulb; a resistance is connected in parallel between the filtering capacitor and the LED bulb to form a protection circuit, which ensures that the LED bulb works in the state of constant current; thus leading the circuit to be reliable, ensuring the structure to be simple and the cost to be low.

Description

A kind of general LED lighting bulb driving circuit that improves structure

Technical field

The utility model relates to a kind of circuit, especially relates to a kind of general LED lighting bulb driving circuit that improves structure.

Background technology

At present, general LED lighting bulb driving circuit of the prior art, mainly contain following several, with reference to Fig. 1, Fig. 2, shown in Figure 3.

The output of rectifier bridge among Fig. 1 (D1, D2, D3, D4) also connects a filter circuit that is made of an electrochemical capacitor C3 and a common electric capacity C2; utilize the charge-discharge characteristic of electrochemical capacitor C3; making pulsating dc voltage after the rectification become relatively galvanic current presses; utilize common electric capacity C2 filtering high frequency and impulse disturbances; and between filter circuit and LED bulb and meet a piezo-resistance RV1; the high voltage pulse voltage of moment in the input power supply is released, thereby protection LED bulb is not punctured by instantaneous pressure.

Between rectifier bridge (D1, D2, D3, D4) and filter capacitor C2 and meet a voltage stabilizing didoe VD1, suppress the high voltage pulse voltage of moment in the input power supply, thereby protection LED bulb is not punctured by instantaneous pressure among Fig. 2.

The circuit of protection LED bulb is made up of controllable silicon SCR and resistance R 3 among Fig. 3; when the electric current that flows through the LED bulb during, the angle that the SCR conducting is certain, thereby circuital current is shunted greater than set point; make the LED bulb work in constant current state, thereby avoid the LED bulb to damage because of instantaneous pressure.

In sum; filter circuit of the prior art generally all is electrochemical capacitor and the common electric capacity than low capacity that adopts and connect a larger capacity; the circuit of protection LED bulb generally also is the serial connection combination of adopting and connect piezo-resistance, voltage stabilizing didoe or controllable silicon and resistance; thereby make the complex structure of circuit, also improved cost simultaneously.

Summary of the invention

Have mirror therewith, the purpose of this utility model is in order to solve the above-mentioned problem that proposes, the general LED lighting bulb driving circuit of the improvement structure that a kind of circuit working is reliable, simple in structure, cost is low to be provided.

To achieve these goals, the technical scheme that the utility model adopted is a kind of general LED lighting bulb driving circuit that improves structure, contain a decompression capacitor, one is connected and is used for converting alternating current to galvanic rectification circuit with this decompression capacitor, a filtering capacitor that is connected between this rectification circuit direct current output loop, and the LED bulb that is connected with this filtering capacitor, it is characterized in that: serial connection one adjustable resistor between the direct current output stage of described rectification circuit and the filtering capacitor, between described filtering capacitor and the LED bulb and connect a resistance.

Described decompression capacitor two ends also connect a bleeder resistance.

The utility model compared with prior art; its beneficial effect is: circuit of the present utility model adopts an electrochemical capacitor filtering; the circuit of protection LED bulb is between filtering capacitor and LED bulb and connects a shunt resistance; thereby avoid the LED bulb to damage because of instantaneous pressure; and serial connection one adjustable resistor between the direct current output stage of rectification circuit and filtering capacitor; watt level according to the LED bulb; regulate the resistance of this resistor, offer the required actual current value of LED bulb.Because used device is less, and uses an electrochemical capacitor filtering and a shunt resistance respectively, circuit structure is simple thus, cost is low; Simultaneously again the LED bulb is carried out the duplicate protection that shunt resistance and adjustable resistor are regulated its output current, circuit working is very reliable thus.

Description of drawings

Fig. 1 is the circuit theory diagrams of prior art one;

Fig. 2 is the circuit theory diagrams of prior art two;

Fig. 3 is the circuit theory diagrams of prior art three;

Fig. 4 is circuit theory diagrams of the present utility model.

Embodiment

Is the function and benefit of further understanding architectural feature of the present utility model in depth and can reach, now enumerates best specific embodiment of the present utility model, and detailed introduction of conjunction with figs. is described as follows:

With reference to shown in Figure 1; alternating current is after decompression capacitor C1 step-down; export to by four diode D1; D2; D3; the input of the rectifier bridge that D4 forms; the direct current output loop of this rectifier bridge is connected with filter circuit; protective circuit; and load circuit; and the filter circuit that constitutes by electrochemical capacitor C3 and common electric capacity C2; the protective circuit that piezo-resistance RV1 constitutes; the load circuit that at least one LED bulb constitutes is connected between the direct current output loop of described rectifier bridge; when the pulse voltage of moment in the input power supply is too high; RV1 releases over the ground by piezo-resistance, thereby protection LED bulb is not punctured by instantaneous pressure.Simultaneously, at the two ends of decompression capacitor C1 and meet a bleeder resistance R1, when the sine wave of alternating current when peak-peak is cut off constantly, remaining electric charge on the decompression capacitor C1 can't discharge, the president stored for a long time, if when maintenance human body touch the metal part of decompression capacitor C1, strong electric shock possibility is arranged, and bleeder resistance R1's and connect, remaining charge discharging resisting can be fallen, thus guarantor, machine safety.

With reference to shown in Figure 2; alternating current is after decompression capacitor C1 step-down; export to by four diode D1; D2; D3; the input of the rectifier bridge that D4 forms; the direct current output loop of this rectifier bridge is connected with protective circuit; filter circuit; and load circuit; and the protective circuit that constitutes by voltage stabilizing didoe VD1; the filter circuit that electrochemical capacitor C2 constitutes; the load circuit that at least one LED bulb constitutes is connected between the direct current output loop of described rectifier bridge; when the pulse voltage of moment in the input power supply is too high; by the pressure stabilization function of voltage stabilizing didoe VD1, thereby protection LED bulb is not punctured by instantaneous pressure.Simultaneously, at the two ends of decompression capacitor C1 and meet a bleeder resistance R1, when the sine wave of alternating current when peak-peak is cut off constantly, remaining electric charge on the decompression capacitor C1 can't discharge, the president stored for a long time, if when maintenance human body touch the metal part of decompression capacitor C1, strong electric shock possibility is arranged, and bleeder resistance R1's and connect, remaining charge discharging resisting can be fallen, thus guarantor, machine safety.

With reference to shown in Figure 3; alternating current is after decompression capacitor C1 step-down; export to by four diode D1; D2; D3; the input of the rectifier bridge that D4 forms; the direct current output loop of this rectifier bridge is connected with filter circuit; protective circuit; and load circuit; and the filter circuit that constitutes by electrochemical capacitor C3 and common electric capacity C2; the protective circuit that controllable silicon SCR and resistance R 3 are formed; the load circuit that at least one LED bulb constitutes is connected between the direct current output loop of described rectifier bridge; when the electric current that flows through the LED bulb during greater than set point; the angle that the SCR conducting is certain; thereby circuital current is shunted; make the LED bulb work in constant current state, thereby avoid the LED bulb to damage because of instantaneous pressure.Simultaneously, at the two ends of decompression capacitor C1 and meet a bleeder resistance R1, when the sine wave of alternating current when peak-peak is cut off constantly, remaining electric charge on the decompression capacitor C1 can't discharge, the president stored for a long time, if when maintenance human body touch the metal part of decompression capacitor C1, strong electric shock possibility is arranged, and bleeder resistance R1's and connect, remaining charge discharging resisting can be fallen, thus guarantor, machine safety.

With reference to shown in Figure 4; this figure is a kind of general LED lighting bulb driving circuit that improves structure that the utility model provides; contain decompression capacitor C1; bleeder resistance R1; rectifier bridge D1; filtering capacitor C2; adjustable resistor R2; protective circuit and load circuit; alternating current is after decompression capacitor C1 step-down; export the input of the rectifier bridge D1 that forms by four diodes to; the direct current output loop of this rectifier bridge D1 is connected with filter circuit; protective circuit; and load circuit; and the filter circuit that constitutes by electrochemical capacitor C2; the protective circuit that resistance R 3 constitutes; the load circuit that at least one LED bulb constitutes is connected between the direct current output loop of described rectifier bridge D1; when the electric current that flows through the LED bulb during greater than set point; shunt by 3 pairs of circuital currents of resistance R; make the LED bulb work in constant current state; thereby avoid the LED bulb to damage because of instantaneous pressure; and serial connection one adjustable resistor R2 between the input utmost point of the direct current output stage of described rectifier bridge D1 and filtering capacitor C2; watt level according to the LED bulb; regulate the resistance of this resistor R 2; offer the required actual current value of LED bulb, the LED bulb is operated under the more stable environment.Simultaneously, at the two ends of decompression capacitor C1 and meet a bleeder resistance R1, when the sine wave of alternating current when peak-peak is cut off constantly, remaining electric charge on the decompression capacitor C1 can't discharge, the president stored for a long time, if when maintenance human body touch the metal part of decompression capacitor C1, strong electric shock possibility is arranged, and bleeder resistance R1's and connect, remaining charge discharging resisting can be fallen, thus guarantor, machine safety.

Claims

1, a kind of general LED lighting bulb driving circuit that improves structure, containing a decompression capacitor, one is connected and is used for converting alternating current to galvanic rectification circuit, a LED bulb that is connected in the filtering capacitor between this rectification circuit direct current output loop and is connected with this filtering capacitor with this decompression capacitor, it is characterized in that: serial connection one adjustable resistor between the direct current output stage of described rectification circuit and the filtering capacitor, between described filtering capacitor and the LED bulb and connect a resistance.

2, the general LED lighting bulb driving circuit of improvement structure according to claim 1 is characterized in that: described decompression capacitor two ends also connect a bleeder resistance.