CN202889689U - Led constant current circuit - Google Patents
Led constant current circuit Download PDFInfo
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- CN202889689U CN202889689U CN2012204389388U CN201220438938U CN202889689U CN 202889689 U CN202889689 U CN 202889689U CN 2012204389388 U CN2012204389388 U CN 2012204389388U CN 201220438938 U CN201220438938 U CN 201220438938U CN 202889689 U CN202889689 U CN 202889689U
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- switching tube
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- amplifier module
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model relates to an LED constant current circuit. The key points of the utility model are that, a high-precision constant-voltage reference source is connected to a low-power operation amplifier, a triode or a field effect transistor is in an amplification state, and a current feedback terminal (Vref) of the operation amplifier is connected to a current detection resistor R2 of an LED string, thereby solving the problem that the conventional LED lamp does not have a high-precision constant current source requiring no additional power supply. According to the utility model, the LED constant current problem is solved, so that the current of an LED lamp string can be highly constant, the light distribution is uniform, the light attenuation in a long term is small, and the service life of the LED lamps are greatly prolonged.
Description
Technical field
The utility model relates to a kind of electronic circuit, and the device that relates in particular to a kind of employing is common but can obtain the LED constant-current circuit of very good effect.
Background technology
Because mostly constant-current source circuit is to build with triode or to pipe on the market at present, but because the discreteness of the tube voltage drop Vbe of triode self and multiplication factor hfe adds temperature floats, actual is to be difficult to produce in batches reach ideal effect.And the utility model circuit can reach in the constant current accuracy 2% in enormous quantities, and cost is also very low.
The utility model content
For the problems referred to above, main purpose of the present utility model is to provide a kind of device of employing common but can obtain the LED constant-current circuit of very good effect.
The utility model solves above-mentioned technical problem by following technical proposals: a kind of LED constant-current circuit, described LED constant-current circuit comprises the amplifier module (IC1) with a reference source and switching tube, power supply (Vdc), the first resistance (R1), the second resistance (R2), field effect transistor (Q1), the LED string, electric capacity (C1), the negative electrode (K) of described amplifier module (IC1) with a reference source and switching tube links to each other by the positive pole of the first resistance (R1) with power supply (Vdc), the anode (A) of described amplifier module (IC1) with a reference source and switching tube links to each other with the negative pole of power supply (Vdc), described LED goes here and there an end and links to each other with the positive pole of power supply (Vdc), the other end links to each other with the drain electrode of field effect transistor (Q1), the source electrode of described field effect transistor (Q1) links to each other with the negative pole of power supply (Vdc) by the second resistance (R2), be parallel with electric capacity (C1) between the drain electrode of being on the scene effect pipe (Q1) and the grid, and the source electrode of field effect transistor (Q1) also links to each other with feedback end (Vref) with the amplifier module (IC1) of a reference source and switching tube, and the grid of described field effect transistor (Q1) also links to each other with negative electrode (K) with the amplifier module (IC1) of a reference source and switching tube.
In specific embodiment of the utility model, described amplifier module (IC1) with a reference source and switching tube comprises low-power consumption amplifier (OP1), triode (N1), voltage stabilizing didoe (Z1), high accuracy constant voltage a reference source (V1), the reverse input end of described low-power consumption amplifier (OP1) links to each other with the positive pole of high accuracy constant voltage a reference source (V1), the output of described low-power consumption amplifier (OP1) links to each other with the base stage of described triode (N1), and the collector electrode of described triode (N1) links to each other with the feeder ear of described low-power consumption amplifier (OP1), form the negative electrode (K) of described amplifier module (IC1) with a reference source and switching tube, the emitter of described triode (N1) links to each other with the negative pole of high accuracy constant voltage a reference source (V1), formation is with the anode (A) of the amplifier module (IC1) of a reference source and switching tube, and the in-phase input end of described low-power consumption amplifier (OP1) forms the feedback end (Vref) with the amplifier module (IC1) of a reference source and switching tube.
Positive progressive effect of the present utility model is: the LED constant-current circuit that the utility model provides has the following advantages: core component of the present utility model is that high accuracy constant voltage a reference source is connected to the low-power consumption amplifier, the triode or the field effect transistor that are in magnifying state are arranged simultaneously, require simultaneously the current feedback terminal Vref of amplifier.Be connected on the current sense resistor R2 of this string LED, can thoroughly solve the high precise current source that present LED lamp not need not extra power supply, this patent can solve LED constant current problem well, utilize that electric current can be highly consistent between the LED lamp lamp pearl string of this patented technology design, luminous intensity distribution is even, it is little to decline with light for a long time, and the life-span prolongs greatly.
The utility model is specially adapted to the LED strip light, the LED Down lamp, and the LED bulkhead lamp capable, the design of many lamps pearl LED light fixtures such as LED road lamp, with low cost, device is general.Both can do the low pressure constant-current source and can also do high-voltage constant current source, watt level all makes things convenient for design.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the reduced graph of dotted line frame among Fig. 1.
Fig. 3 is the reduced graph of Fig. 1.
Fig. 4 is one of application schematic diagram of the present utility model.
Fig. 5 is two of application schematic diagram of the present utility model.
Embodiment
Provide the utility model preferred embodiment below in conjunction with accompanying drawing, to describe the technical solution of the utility model in detail.
Fig. 1 is structural representation of the present utility model.Fig. 2 is the reduced graph of dotted line frame among Fig. 1, and Fig. 3 is the reduced graph of Fig. 1.As Figure 1-3: the utility model comprises the amplifier module I C1 with a reference source and switching tube, power supply Vdc, the first resistance R 1, the second resistance R 2, field effect transistor Q1, the LED string, capacitor C 1, the negative electrode (K) of described amplifier module I C1 with a reference source and switching tube links to each other with the positive pole of power supply Vdc by the first resistance R 1, the anode (A) of described amplifier module I C1 with a reference source and switching tube links to each other with the negative pole of power supply Vdc, described LED goes here and there an end and links to each other with the positive pole of power supply Vdc, the other end links to each other with the drain electrode of field effect transistor Q1, the source electrode of described field effect transistor Q1 links to each other with the negative pole of power supply Vdc by the second resistance (R2), be parallel with capacitor C 1 between the drain electrode of being on the scene effect pipe Q1 and the grid, and the source electrode of field effect transistor Q1 also links to each other with feedback end Vref with the amplifier module I C1 of a reference source and switching tube, and the grid of described field effect transistor Q1 also links to each other with negative electrode (K) with the amplifier module I C1 of a reference source and switching tube.
Amplifier module I C1 with a reference source and switching tube comprises low-power consumption amplifier OP1, triode N1, voltage stabilizing didoe Z1, high accuracy constant voltage a reference source V1, the reverse input end of low-power consumption amplifier OP1 links to each other with the positive pole of high accuracy constant voltage a reference source V1, the output of low-power consumption amplifier OP1 links to each other with the base stage of described triode N1, and the collector electrode of triode N1 links to each other with the feeder ear of described low-power consumption amplifier OP1, form the negative electrode (K) of described amplifier module I C1 with a reference source and switching tube, the emitter of triode N1 links to each other with the negative pole of high accuracy constant voltage a reference source V1, formation is with the anode (A) of the amplifier module I C1 of a reference source and switching tube, and the in-phase input end of low-power consumption amplifier OP1 forms the feedback end Vref with the amplifier module I C1 of a reference source and switching tube.
As shown in Figure 2: this module is actual to be an adjustable voltage stabilizer or to be amplifier module with a reference source and switching tube, and existing encapsulation is very little on the market, and unit price is very low, the ic circuit IC that brand is extremely many, and having does not simultaneously need accessory power supply, the efficient high.Fig. 1 just can become such as Fig. 3 thus.
Since low-cost, high accuracy, and little encapsulation is particularly suitable for the fluorescent tube constant current scheme of long and narrow application requirements.
Fig. 4 is one of application schematic diagram of the present utility model.Fig. 5 is two of application schematic diagram of the present utility model.Shown in Fig. 4-5: the circuit that the utility model provides is as long as voltage and the encapsulation of Q1 are selected suitablely; can make high-voltage constant current source; add current rectifying and wave filtering circuit; and protective circuit; can directly load onto lamp outer casing and become high reliability, almost without the efficient LED illuminating lamp tool of the interference problem of EMC and EMI.The life-span that can thoroughly solve present Switching Power Supply is the short slab problem of LED lamp life, can avoid simultaneously the High-frequency Interference problem of Switching Power Supply, in conjunction with the relatively stable present situation of at present China Power Grids power supply, LED drive efficiency than Switching Power Supply control improves 10% ~ 15%, drive thermal losses and reduce by 80%, greatly reduce and drive the space, saving LED light fixture heat radiation cost, minimizing weight.
For low-power LED lamp, this core circuit can also add the AC rectification filter circuit, adds resistance R CBB electric capacity in parallel before rectifier bridge again, adds rectifying and wave-filtering and protective circuit, can directly be designed to a relative broad range, the LED light fixture of high reliability.
More than show and described basic principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that describes in above-described embodiment and the specification just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications; these changes and improvements all fall in claimed the utility model scope, and the claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (2)
1. LED constant-current circuit, described LED constant-current circuit comprises the amplifier module (IC1) with a reference source and switching tube, power supply (Vdc), the first resistance (R1), the second resistance (R2), field effect transistor (Q1), the LED string, electric capacity (C1), it is characterized in that, the negative electrode (K) of described amplifier module (IC1) with a reference source and switching tube links to each other by the positive pole of the first resistance (R1) with power supply (Vdc), the anode (A) of described amplifier module (IC1) with a reference source and switching tube links to each other with the negative pole of power supply (Vdc), described LED goes here and there an end and links to each other with the positive pole of power supply (Vdc), the other end links to each other with the drain electrode of field effect transistor (Q1), the source electrode of described field effect transistor (Q1) links to each other with the negative pole of power supply (Vdc) by the second resistance (R2), be parallel with electric capacity (C1) between the source electrode of being on the scene effect pipe (Q1) and the grid, and the source electrode of field effect transistor (Q1) also links to each other with feedback end (Vref) with the amplifier module (IC1) of a reference source and switching tube, and the grid of described field effect transistor (Q1) also links to each other with negative electrode (K) with the amplifier module (IC1) of a reference source and switching tube.
2. LED constant-current circuit according to claim 1, it is characterized in that: described amplifier module (IC1) with a reference source and switching tube comprises low-power consumption amplifier (OP1), triode (N1), voltage stabilizing didoe (Z1), high accuracy constant voltage a reference source (V1), the reverse input end of described low-power consumption amplifier (OP1) links to each other with the positive pole of high accuracy constant voltage a reference source (V1), the output of described low-power consumption amplifier (OP1) links to each other with the base stage of described triode (N1), and the collector electrode of described triode (N1) links to each other with the feeder ear of described low-power consumption amplifier (OP1), form the negative electrode (K) of described amplifier module (IC1) with a reference source and switching tube, the emitter of described triode (N1) links to each other with the negative pole of high accuracy constant voltage a reference source (V1), formation is with the anode (A) of the amplifier module (IC1) of a reference source and switching tube, and the in-phase input end of described low-power consumption amplifier (OP1) forms the feedback end (Vref) with the amplifier module (IC1) of a reference source and switching tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012204389388U CN202889689U (en) | 2012-08-30 | 2012-08-30 | Led constant current circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012204389388U CN202889689U (en) | 2012-08-30 | 2012-08-30 | Led constant current circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202889689U true CN202889689U (en) | 2013-04-17 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012204389388U Expired - Lifetime CN202889689U (en) | 2012-08-30 | 2012-08-30 | Led constant current circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202889689U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106998057A (en) * | 2017-04-25 | 2017-08-01 | 黄浩波 | A kind of LED modules overcurrent protector |
-
2012
- 2012-08-30 CN CN2012204389388U patent/CN202889689U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106998057A (en) * | 2017-04-25 | 2017-08-01 | 黄浩波 | A kind of LED modules overcurrent protector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 201700 no.485-n, pucang Road, Qingpu District, Shanghai Patentee after: Benfa lighting (Shanghai) Co.,Ltd. Patentee after: Jiang Haijun Address before: 201700 no.485-n, pucang Road, Qingpu District, Shanghai Patentee before: GLOBAL EXPAND (SH) ELECTRONICS TECHNOLOGY Co.,Ltd. Patentee before: Jiang Haijun |
|
| CP01 | Change in the name or title of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130417 |
|
| CX01 | Expiry of patent term |