CN204465981U

CN204465981U - A kind of based on monolithic processor controlled LED open loop protection circuit

Info

Publication number: CN204465981U
Application number: CN201520156016.1U
Authority: CN
Inventors: 万军; 吕值敏; 杨代强
Original assignee: Chongqing Creation Vocational College
Current assignee: Chongqing Creation Vocational College
Priority date: 2015-03-19
Filing date: 2015-03-19
Publication date: 2015-07-08
Anticipated expiration: 2025-03-19

Abstract

The utility model describes a kind of based on monolithic processor controlled LED open loop protection circuit, and it comprises single-chip microcomputer IC, is connected again, resistance R1 is parallel with electric capacity C1 after first pin of single-chip microcomputer IC is connected with resistance R1 with power input; The 5th pin is connected to after first pin of single-chip microcomputer IC is also connected with inductance L 1, voltage stabilizing didoe D1 and LED successively; LED is contact resistance R2 also, ground connection after resistance R2 is connected with voltage stabilizing didoe D3; Second pin of single-chip microcomputer IC is also connected with field effect transistor M1, ground connection after voltage stabilizing didoe D1 is connected with electric capacity C2.LED open loop protection circuit of the present utility model not only has reliable and stable output voltage electric current; the more important thing is that it can when open circuit appears in LED; be retained to the state that rare LED is lighted; and its structure relatively more simplifies; therefore power factor (PF) is higher; energy consumption is less, has good market prospects.

Description

A kind of based on monolithic processor controlled LED open loop protection circuit

Technical field

The utility model relates to the protective circuit of a kind of LED, especially a kind of based on monolithic processor controlled LED open loop protection circuit, belongs to electronic technology field.

Background technology

In recent years, along with the development of microelectric technique, adopt the light fixture of 1 ~ 3W great power LED to get more and more, its power can from several watts to upper hectowatt.Now current the used high-power LED lamp version that mostly adopts LED strip to join, and power with constant-current supply, but, the LED of this series connection has a shortcoming: if there is a LED that the situation of open circuit occurs in the LED of series connection, all LED then on whole piece circuit have not all worked, and this is very dangerous to the application of some light fixture (as warning lamp, mine lamp, emergency light etc.).

Therefore, in order to ensure that when LED circuit generation open circuit situation, LED can also be bright, needs to improve the structure of LED circuit.

Summary of the invention

For above-mentioned deficiency of the prior art; main purpose of the present utility model is to solve existing current high-powered LED lamp when there is open circuit situation; the problem that cannot normally use; and provide one to have reliable job stability; even if when there is LED open circuit, the LED open loop protection circuit that other LED normally work still can be kept.

The technical solution of the utility model: a kind of based on monolithic processor controlled LED open loop protection circuit, it is characterized in that, comprise single-chip microcomputer IC, be connected with power input again after first pin of described single-chip microcomputer IC is connected with resistance R1, described resistance R1 is parallel with electric capacity C1; The 5th pin of single-chip microcomputer IC is connected to after the voltage stabilizing didoe D1 that first pin of described single-chip microcomputer IC is also connected with inductance L 1, forward successively and the LED that forward connects connect; One end of the forward of described LED also contact resistance R2, ground connection after the other end of described resistance R2 is connected with the voltage stabilizing didoe D3 of Opposite direction connection; Second pin of described single-chip microcomputer IC is also connected with the grid of field effect transistor M1, the source electrode of described field effect transistor M1 is connected with the 3rd pin of single-chip microcomputer IC, the drain electrode of described field effect transistor M1 is connected to the positive pole of voltage stabilizing didoe D1, and the negative pole of described voltage stabilizing didoe D1 is connected rear ground connection with electric capacity C2; 3rd pin of described single-chip microcomputer is also connected rear ground connection with inductance L 2; 4th pin of described single-chip microcomputer IC is also connected with the base stage of triode Q1, the emitter of described triode Q1 is connected with the base stage of triode Q2, the collector electrode of triode Q2 is connected to after the collector electrode of described triode Q1 is connected with resistance R3, on the emitter of described triode Q2, forward is connected with diode D2, and the negative pole of described diode D2 is connected with the negative pole of voltage stabilizing didoe D1; The 6th pin ground connection of described single-chip microcomputer IC.

Optimally, what described single-chip microcomputer IC adopted is model is the singlechip chip of CN5619.

Optimally, the capacity of described electric capacity C2 is 22uF, and the capacity of described electric capacity C1 is 5uF.

Optimally, described field effect transistor M1 is the field effect transistor of model PHB95N03LT.

Relative to prior art, the utility model has following beneficial effect:

LED open loop protection circuit of the present utility model adopts single-chip microcomputer as control core, not only there is reliable and stable output voltage electric current, the more important thing is that it can when open circuit appears in LED, by the voltage stabilizing didoe of parallel connection, be retained to the state that rare LED is lighted, like this for the staff under some particular job environment and, there is great protective effect; Open loop protection circuit structure of the present utility model relatively more simplifies, and therefore power factor (PF) is higher, and energy consumption is less, has good market prospects.

Accompanying drawing explanation

Fig. 1 is a kind of circuit theory diagrams based on monolithic processor controlled LED open loop protection circuit of the utility model.

Embodiment

Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.

As shown in Figure 1, one of the present utility model, based on monolithic processor controlled LED open loop protection circuit, comprises single-chip microcomputer IC, and what described single-chip microcomputer IC adopted is model is the singlechip chip of CN5619.Be connected with power input again after first pin of described single-chip microcomputer IC is connected with resistance R1, described resistance R1 is parallel with electric capacity C1; The capacity of described electric capacity C1 is 5uF.The 5th pin of single-chip microcomputer IC is connected to after the voltage stabilizing didoe D1 that first pin of described single-chip microcomputer IC is also connected with inductance L 1, forward successively and the LED that forward connects connect; In the utility model, described LED can be in series for many, and one end of the forward of described LED also contact resistance R2, the other end of described resistance R2 is connected ground connection afterwards with the voltage stabilizing didoe D3 of Opposite direction connection.Here voltage stabilizing didoe D3 mainly plays the effect of open-circuit-protection, and when open circuit situation appears in LED, the automatic conducting of voltage stabilizing didoe D3 is lighted, and plays the effect of illumination.

See Fig. 1, second pin of described single-chip microcomputer IC is also connected with the grid of field effect transistor M1, described field effect transistor M1 is the field effect transistor of model PHB95N03LT.The source electrode of described field effect transistor M1 is connected with the 3rd pin of single-chip microcomputer IC, and the drain electrode of described field effect transistor M1 is connected to the positive pole of voltage stabilizing didoe D1, and the negative pole of described voltage stabilizing didoe D1 is connected rear ground connection with electric capacity C2; The capacity of electric capacity C2 described here is 22uF, and the 3rd pin of described single-chip microcomputer is also connected rear ground connection with inductance L 2.4th pin of described single-chip microcomputer IC is also connected with the base stage of triode Q1, the emitter of described triode Q1 is connected with the base stage of triode Q2, the collector electrode of triode Q2 is connected to after the collector electrode of described triode Q1 is connected with resistance R3, on the emitter of described triode Q2, forward is connected with diode D2, and the negative pole of described diode D2 is connected with the negative pole of voltage stabilizing didoe D1; The 6th pin ground connection of described single-chip microcomputer IC.In the utility model; by the effect of triode Q1 and triode Q2; protection can be formed to the output voltage of single-chip microcomputer IC; the moment occurred at open circuit is avoided to cause the input voltage of single-chip microcomputer excessive; so not only can ensure LED continue light, can also ensure that integrated circuit works continually and steadily.

It should be noted that, above embodiment is only in order to illustrate technical solutions of the utility model but not restriction technologies scheme, although applicant is explained in detail the utility model with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, those amendments that technical solutions of the utility model are carried out or equivalently to replace, aim and the scope of the technical program can not be departed from, all should be encompassed in the middle of the utility model right.

Claims

1. based on a monolithic processor controlled LED open loop protection circuit, it is characterized in that, comprise single-chip microcomputer IC, be connected with power input again after first pin of described single-chip microcomputer IC is connected with resistance R1, described resistance R1 is parallel with electric capacity C1; The 5th pin of single-chip microcomputer IC is connected to after the voltage stabilizing didoe D1 that first pin of described single-chip microcomputer IC is also connected with inductance L 1, forward successively and the LED that forward connects connect; One end of the forward of described LED also contact resistance R2, ground connection after the other end of described resistance R2 is connected with the voltage stabilizing didoe D3 of Opposite direction connection; Second pin of described single-chip microcomputer IC is also connected with the grid of field effect transistor M1, the source electrode of described field effect transistor M1 is connected with the 3rd pin of single-chip microcomputer IC, the drain electrode of described field effect transistor M1 is connected to the positive pole of voltage stabilizing didoe D1, and the negative pole of described voltage stabilizing didoe D1 is connected rear ground connection with electric capacity C2; 3rd pin of described single-chip microcomputer is also connected rear ground connection with inductance L 2; 4th pin of described single-chip microcomputer IC is also connected with the base stage of triode Q1, the emitter of described triode Q1 is connected with the base stage of triode Q2, the collector electrode of triode Q2 is connected to after the collector electrode of described triode Q1 is connected with resistance R3, on the emitter of described triode Q2, forward is connected with diode D2, and the negative pole of described diode D2 is connected with the negative pole of voltage stabilizing didoe D1; The 6th pin ground connection of described single-chip microcomputer IC.

2. one according to claim 1 is based on monolithic processor controlled LED open loop protection circuit, it is characterized in that, what described single-chip microcomputer IC adopted is model is the singlechip chip of CN5619.

3. one according to claim 2 is based on monolithic processor controlled LED open loop protection circuit, it is characterized in that, the capacity of described electric capacity C2 is 22uF, and the capacity of described electric capacity C1 is 5uF.

4. one according to claim 3 is based on monolithic processor controlled LED open loop protection circuit, it is characterized in that, described field effect transistor M1 is the field effect transistor of model PHB95N03LT.