CN1722927A - An LED illuminating circuit - Google Patents
An LED illuminating circuit Download PDFInfo
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- CN1722927A CN1722927A CN 200410040265 CN200410040265A CN1722927A CN 1722927 A CN1722927 A CN 1722927A CN 200410040265 CN200410040265 CN 200410040265 CN 200410040265 A CN200410040265 A CN 200410040265A CN 1722927 A CN1722927 A CN 1722927A
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Abstract
This invention discloses a light-emitting diode lighting circuit, which comprises light-emitting diode array and the constant current source circuit, characterized in that it will decrease the stability requirement of the power through the current stabilization function of the constant current source, by which it need not use high energy consumption current-limiting resistance when connecting direct current power supply; when connecting alternating current power, it makes the light-emitting diode working normally only need to use the simple electric rectification scheme. The invention also discloses a circuit made of discrete component, which can realize constant-current and alternating current rectification scheme.
Description
Technical field
The present invention relates to a kind of lighting circuit, especially relate to a kind of light-emitting diode (LED) illuminating circuit.
Background technology
The luminaire that generally uses at lighting field at present mainly contains incandescent lamp, fluorescent lamp etc.Incandescent lamp is because heating is big, and the energy consumption height progressively is being eliminated, and fluorescent lamp then has the life-span short, and structure is comparatively complicated, so the higher shortcoming of use cost.And advantages such as light-emitting diode is efficient, energy-conservation with it, life-span length more and more come into one's own in lighting field.
The general drive circuitry scheme of light-emitting diode of using is divided into two kinds of situations: a kind of is to adopt ready-made D.C. regulated power supply (for example battery, electric storage means etc.) directly to power to light-emitting diode; A kind of is to adopt common alternating current (for example city's electrical network of alternating current 220V) to come to power to light-emitting diode.Two kinds of schemes all relate to a common technical problem: make output current meet the condition of work of light-emitting diode, and keep certain stability.To the DC voltage-stabilizing power supply plan, generally adopt the method for series limiting resistor to solve the problems referred to above, this scheme is the most common in present most of electronic equipments, instrument and meter.The shortcoming of this scheme is that the power consumption of current-limiting resistance generally all greater than light-emitting diode, has increased a large amount of unnecessary energy consumptions, and the problem that current-limiting resistance heating simultaneously brings also can produce restriction to its range of application.To common Alternating Current Power Supply scheme, also to solve the galvanic problem that is converted into simultaneously, two kinds of methods are generally arranged: a kind of is by links such as traditional AC transformation, rectification, series connection voltage stabilizings; A kind of is to adopt advanced Switching Power Supply directly to produce required D.C. regulated power supply.Shortcomings such as the former has the cost height because used device such as transformer, and energy consumption is big, though the latter has low energy consumption, complex structure, cost also are higher.
And the above-mentioned drive circuit scheme that is used for light-emitting diode at present is used for aspects such as low power signal indicating circuit more.To being used for the circuit of LED scheme of normal lighting, according to the knowledge of the applicant, still rarely seen open and application.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of and existing lighting technology, and specific energy consumption is low, simple in structure mutually, the light-emitting diode (LED) illuminating circuit applicable to the AC and DC power supply with low cost.
In order to solve the problems of the technologies described above, basic design of the present invention is: light emitting diode matrix and constant-current source circuit are in series.The implication of " light emitting diode matrix " is described in the present invention: the light-emitting diode by series connection more than or constitutes basic row, so basic row or so basic row formation light emitting diode matrix that is in parallel more than.Circuit of the present invention can connect DC power supply also can connect the AC power of handling through simple rectification.Described constant-current source circuit can be a circuit structure of realizing the constant current function arbitrarily.
As preferred version, the invention provides the embodiment of two kinds of constant-current source circuits.One: one triode of adjusting pipe as drive current of scheme, its current collection is the constant current output very, it is in parallel as the external power supply end behind the current limliting feedback resistance connect with emitter behind voltage stabilizing didoe of its base stage series connection, and its base stage is connected behind the base biasing resistor as the base bias voltage input.A described constant current output and an end that connects power output after light emitting diode matrix is connected, the other end of described external power supply termination power delivery outlet, but the input of described base bias voltage input external voltage also can be connected between any two adjacent light-emitting diodes of any row in the light emitting diode matrix.Scheme two: the voltage stabilizing didoe in the scheme one is replaced with one or more mutual diode in series.
The present invention also provides two kinds of directly embodiments of the rectification circuit of AC power.Scheme one: form rectifier bridge by crystal diode, the two ends that the non-conterminous a pair of tie point of rectifier bridge is the input port connect the two ends of AC power respectively, and another is the two ends of delivery outlet to tie point.Scheme two: between the rectifier bridge delivery outlet two ends of scheme one, connect an electric capacity again.
Because basic structure of the present invention is that light emitting diode matrix is connected with constant-current source circuit, its beneficial technical effects is: 1) make it possible to produce enough brightness and be used for illumination; 2), adopt constant-current source, guaranteed the relative stability of light-emitting diode operating current, prolonged the useful life of light-emitting diode; 3) adopt constant-current source, reduced requirement: on the one hand, when connecing DC power supply, need not use the current-limiting resistance of high energy consumption, make the present invention have energy-efficient advantage power supply stability; On the other hand, when direct AC power, can adopt above-mentioned two kinds of very simple power rectifier schemes just can reach the purpose that makes the light-emitting diode operate as normal, make to exchange and insert particularly civil power and insert illumination down and use simple more and easy realization; 4) can realize constant-current source circuit and rectification circuit by simple structure with the discrete component of cheapness, make the present invention have advantage simple in structure, with low cost; 5) owing to semiconductor reliability high (more than 1,000,000 hours), long service life (existing more than 10 times of light source), the present invention has a extensive future, and compares with existing lighting solutions to have very significant advantage.
Description of drawings
Fig. 1 is a basic circuit of the present invention;
Fig. 2 is the preferred version that constant-current source circuit is implemented among Fig. 1;
Fig. 3 is another preferred version that constant-current source circuit is implemented among Fig. 1;
Fig. 4 is the preferred version that power supply is implemented among Fig. 1;
Fig. 5 is another preferred version that power supply is implemented among Fig. 1;
Fig. 6 is that circuit of the present invention is exchanging the illumination application example that drives single-row light-emitting diode under the input;
Fig. 7 is that circuit of the present invention is exchanging the application example that drives multiple row light-emitting diode in parallel under the input.
Embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments:
Embodiment one, a kind of light-emitting diode (LED) illuminating circuit, in conjunction with Fig. 1, Fig. 2 and Fig. 4, the light emitting diode matrix of being made up of several LEDs is connected with constant-current source circuit Ic and is constituted basic circuit of the present invention, and such basic circuit or several such basic circuits also are connected in the two ends of power supply.Ic in this example adopts the structure among Fig. 2: a triode T who adjusts pipe as drive current, its current collection is the constant current output very, it is in parallel as the external power supply end behind the current limliting feedback resistance Re connect with emitter behind voltage stabilizing didoe D of its base stage series connection, and its base stage is connected behind the base biasing resistor Rb as the base bias voltage input.Power supply in this example adopts the structure among Fig. 4: by the rectifier bridge Q that four crystal diodes are formed, the two ends that the non-conterminous a pair of tie point of rectifier bridge is the input port connect the two ends of AC power AC respectively, and another is the two ends of delivery outlet to tie point.A described constant current output and an end that connects power output after light emitting diode matrix is connected, the other end of described external power supply termination power delivery outlet, described base bias voltage input are connected between any two adjacent light-emitting diodes of any row in the light emitting diode matrix.
Embodiment two, another kind of light-emitting diode (LED) illuminating circuit in conjunction with Fig. 1, Fig. 3 and Fig. 5, are replaced constant-current source circuit among the embodiment 1 and power supply respectively with the structure among Fig. 3 and Fig. 5.That is, the D among the embodiment 1 is replaced with two mutual diode in series D1 and D2, connect a capacitor C again between rectifier bridge delivery outlet two ends, other structures are constant.
Can obtain new embodiment in conjunction with Fig. 1, Fig. 3, Fig. 4 or Fig. 1, Fig. 2, Fig. 5 in addition, repeat no more.Owing to used voltage stabilizing didoe, can provide very stable benchmark voltage for the scheme of above-mentioned different constant-current sources and rectification circuit Scheme Selection: Fig. 2, better constant current effect be arranged than the scheme of Fig. 3; The scheme of Fig. 3 can be selected wide reference voltage range owing to use the general-purpose diode serial connection, than the scheme of Fig. 2 cheaper cost and bigger control range is arranged.The scheme of Fig. 5 has been owing to used electric capacity, than the scheme of Fig. 4 better voltage shaping effect is arranged, but the scheme of Fig. 4 also can guarantee the realization of the basic purpose of the present invention.
Embodiment three, another light-emitting diode (LED) illuminating circuit, in conjunction with Fig. 6, alternating current 220V city power supply AC is connected on the non-conterminous a pair of tie point of the rectifier bridge Q that is made up of four diodes, and another of Q is to connecing the capacitor C that is used to improve waveform between the tie point.(1≤i≤n) is connected into row for n high brightness white light-emitting diode LED-i, the end of one termination capacitor C, the collector electrode of another termination triode T, behind current limliting feedback resistance Re of the emitter of T serial connection with two diode D1 of base stage series connection of T and D2 after and connect the end that capacitor C is not connected the light-emitting diode row, be connected on behind base biasing resistor Rb of base stage series connection of T in the light-emitting diode row between two adjacent light-emitting diodes.The model of forming four diodes of Q in this example is IN4007, and C is 224P/400VDC, and T is 9014C, and Re is 2.4 Ω, and Rb is 10K Ω, and D1 and D2 are respectively IN4007 and IN5819.As previously mentioned, the structure of D1 and D2 serial connection can replace with a voltage stabilizing didoe in this example.
Embodiment four, another light-emitting diode (LED) illuminating circuit, in conjunction with Fig. 7, m is listed as that (1≤j≤m, the row of the series connection of 1≤i≤n) are connected in parallel and replace single-row light-emitting diode among the embodiment 1 by n LED-j-i.
In addition, in actual applications, can also use the circuit of variable voltage to replace voltage stabilizing didoe or provide reference voltage, realize the variable chemical control system of lumination of light emitting diode brightness with this with the series diode of voltage stabilizing didoe same function.
The present invention is in illuminating engineering, particularly by aspects such as the road lighting of city's electrical network power supply, lighting of home, architectural lighting, decorative lighting, lights of stage, and vehicles illumination, for example: aspects such as train illumination, ship's service lighting, airborne vehicle illumination have a wide range of applications.
Claims (10)
1, a kind of light-emitting diode (LED) illuminating circuit is characterized in that: comprise at least by light emitting diode matrix and with it the series connection the drive circuit that constant-current source circuit constituted.
2, light-emitting diode (LED) illuminating circuit according to claim 1 is characterized in that: also comprise rectification circuit, the other end of the voltage output difference sending and receiving light diode array of rectification circuit and the other end of constant-current source circuit.
3, light-emitting diode (LED) illuminating circuit according to claim 2 is characterized in that: described rectification circuit is the bridge rectifier that is constituted by a diode.
4, light-emitting diode (LED) illuminating circuit according to claim 1 and 2, it is characterized in that: described constant-current source circuit comprises a triode of adjusting pipe as drive current, connect with base stage behind current limliting feedback resistance of its an emitter series connection end of external power supply in parallel behind the voltage stabilizing didoe, the other end of external power supply behind its collector electrode series connection light emitting diode matrix is connected between any two adjacent light-emitting diodes of any row in the light emitting diode matrix behind base biasing resistor of its base stage series connection.
5, light-emitting diode (LED) illuminating circuit according to claim 4 is characterized in that: described voltage stabilizing didoe is replaced by one or more diode series connection back.
6, a kind of light-emitting diode (LED) illuminating circuit is characterized in that: the constant-current source circuit by light emitting diode matrix and series connection is with it formed.
7, light-emitting diode (LED) illuminating circuit according to claim 6, it is characterized in that: described constant-current source circuit comprises a triode of adjusting pipe as drive current, connect with base stage behind current limliting feedback resistance of its an emitter series connection end of external power supply in parallel behind the voltage stabilizing didoe, the other end of external power supply behind its collector electrode series connection light emitting diode matrix is connected between any two adjacent light-emitting diodes of any row in the light emitting diode matrix behind base biasing resistor of its base stage series connection.
8, a kind of light-emitting diode (LED) illuminating circuit, it is characterized in that: form by rectification circuit, light emitting diode matrix and constant-current source circuit, one end of one termination constant-current source circuit of light emitting diode matrix, the other end of another termination constant-current source circuit of the other end of a termination light emitting diode matrix of the voltage output of rectification circuit, the voltage output of rectification circuit.
9, light-emitting diode (LED) illuminating circuit according to claim 8 is characterized in that: described rectification circuit is the bridge rectifier that is constituted by a diode.
10, according to Claim 8 or 9 described light-emitting diode (LED) illuminating circuits, it is characterized in that: described constant-current source circuit comprises a triode of adjusting pipe as drive current, connect with base stage behind current limliting feedback resistance of its an emitter series connection end of external power supply in parallel behind the voltage stabilizing didoe, connect the other end of power supply behind its collector electrode series connection light emitting diode matrix, be connected between any two adjacent light-emitting diodes of any row in the light emitting diode matrix behind base biasing resistor of its base stage series connection.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410040265 CN1722927A (en) | 2004-07-15 | 2004-07-15 | An LED illuminating circuit |
| PCT/CN2005/000219 WO2006005239A1 (en) | 2004-07-15 | 2005-01-11 | A lighting circuit of light emitting diodes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410040265 CN1722927A (en) | 2004-07-15 | 2004-07-15 | An LED illuminating circuit |
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| Publication Number | Publication Date |
|---|---|
| CN1722927A true CN1722927A (en) | 2006-01-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410040265 Pending CN1722927A (en) | 2004-07-15 | 2004-07-15 | An LED illuminating circuit |
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| CN (1) | CN1722927A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008133792A2 (en) | 2007-04-25 | 2008-11-06 | American Bright Lighting, Inc. | Solid state lighting apparatus |
| CN102143625A (en) * | 2010-01-29 | 2011-08-03 | 深圳市长运通集成电路设计有限公司 | Device for controlling light emission of LED (Light Emitting Diode) and LED lamp |
| CN102427632A (en) * | 2011-12-21 | 2012-04-25 | 浙江恒曼光电科技有限公司 | LED apparatus and wishing lamp comprising same |
| US8283868B2 (en) | 2008-08-21 | 2012-10-09 | American Bright Lighting, Inc. | LED light engine |
| CN103096575A (en) * | 2011-10-27 | 2013-05-08 | 迪尔航空航天有限公司 | Lighting Device For An AC Power Supply |
| US8669709B2 (en) | 2010-08-27 | 2014-03-11 | American Bright Lighting, Inc. | Solid state lighting driver with THDi bypass circuit |
| CN108169658A (en) * | 2017-12-14 | 2018-06-15 | 上海华虹宏力半导体制造有限公司 | The output current test circuit and test method of device blocks |
-
2004
- 2004-07-15 CN CN 200410040265 patent/CN1722927A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008133792A2 (en) | 2007-04-25 | 2008-11-06 | American Bright Lighting, Inc. | Solid state lighting apparatus |
| EP2140737A2 (en) * | 2007-04-25 | 2010-01-06 | American Bright Lighting, Inc. | Solid state lighting apparatus |
| EP2140737A4 (en) * | 2007-04-25 | 2012-02-22 | American Bright Lighting Inc | Solid state lighting apparatus |
| US8258720B2 (en) | 2007-04-25 | 2012-09-04 | American Bright Lighting, Inc. | Solid state lighting apparatus |
| US8283868B2 (en) | 2008-08-21 | 2012-10-09 | American Bright Lighting, Inc. | LED light engine |
| CN102143625A (en) * | 2010-01-29 | 2011-08-03 | 深圳市长运通集成电路设计有限公司 | Device for controlling light emission of LED (Light Emitting Diode) and LED lamp |
| CN102143625B (en) * | 2010-01-29 | 2014-06-11 | 深圳市长运通集成电路设计有限公司 | Device for controlling light emission of LED (Light Emitting Diode) and LED lamp |
| US8669709B2 (en) | 2010-08-27 | 2014-03-11 | American Bright Lighting, Inc. | Solid state lighting driver with THDi bypass circuit |
| CN103096575A (en) * | 2011-10-27 | 2013-05-08 | 迪尔航空航天有限公司 | Lighting Device For An AC Power Supply |
| CN102427632A (en) * | 2011-12-21 | 2012-04-25 | 浙江恒曼光电科技有限公司 | LED apparatus and wishing lamp comprising same |
| CN108169658A (en) * | 2017-12-14 | 2018-06-15 | 上海华虹宏力半导体制造有限公司 | The output current test circuit and test method of device blocks |
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Open date: 20060118 |