CN102291882A - LED (Light Emitting Diode) drive circuit for replacing low-voltage AC (Alternating Current) incandescent lamp - Google Patents
LED (Light Emitting Diode) drive circuit for replacing low-voltage AC (Alternating Current) incandescent lamp Download PDFInfo
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Abstract
The invention discloses an LED (Light Emitting Diode) drive circuit for replacing a low-voltage AC (Alternating Current) incandescent lamp. The LED drive circuit comprises an electromagnetic transformer or electronic transformer (1), an input current correcting circuit (2) and an LED drive circuit (3) with low-voltage AC input which are sequentially connected. The input current correcting circuit (2) provides a relative compensation current according to input voltages and frequencies of the two ends of the input current correcting circuit (2); the LED drive circuit (3) with the low-voltage AC input provides a preset constant DC (Direct Current) for an LED load; the compensation current and an input current generated by an input voltage of the LED drive circuit (3) with the low-voltage AC input are combined to form a load current of the electromagnetic transformer or electronic transformer (1); and the electromagnetic transformer or electronic transformer (1) works normally through the load current. The LED drive circuit for replacing the low-voltage AC incandescent lamp can solve the problem that an LED driver can not be compatible with all electromagnetic transformers and electronic transformers very well to work normally.
Description
Technical field
The invention belongs to electronic technology field, relate to the light-emitting diode general illumination.More particularly, the present invention relates to a kind of LED driving circuit that is used to replace the low-voltage alternating-current incandescent lamp.
Background technology
Nowadays, illumination accounts for the whole world nearly 1/5th with total electric weight, and its overwhelming majority is still used the incandescent lamp of poor efficiency.Promote the energy-saving illumination technology and will save electric energy greatly, reduce CO2 emissions, and reduce the demand in newly-built power plant.For example, USDOE estimates only built-in spotlight to be replaced to one of LED, and annual electric energy just can save 81.2 TW terawatts the time is equivalent to year power consumption of 6,700,000 families.To sum up, the electric energy saved of only this item can reduce the construction of 13 1000MW thermal power plants.The power consumption range of MR16 incandescent lamp commonly used is 10W to 50W, and its luminous flux scope is that 150 lumens (lm) are to 800lm.Therefore, the efficient of typical MR16 incandescent lamp is about every watt 15 lumen (lm/W).
LED technology of today provides the solid-state illumination replacement scheme of high performance-price ratio, MR16 compatibility for the MR16 incandescent lamp.These LED can reach every watt 100 lumen (lm/W) and save 80% power consumption than MR16 incandescent lamp under the same brightness condition.In addition, the service time of typical mr 16 incandescent lamps is in 2000 hours, and LED still can keep the intensity of illumination of quite high (70%) after long-term work (50,000 hours).LED effectively reduces the interior replacing bulb rate of keeping life long useful life, safeguards and cost of use thereby reduce.
Because the existing application characteristic of MR16 incandescent lamp, it is mainly by low pressure 12V AC driving.It is by general electromagnetic transformers or electronic transformer the step-down of 120V or 220V line voltage to be become corresponding 12V alternating voltage that this 12V exchanges.Because the MR16 incandescent lamp presents pure linear resistance property, it can be well with electromagnetic transformers or the compatible work of electronic transformer.
For light-emitting diode, in order to make light-emitting diode work operational excellence, requiring its light-emitting diode drive source is current source; Usually this LED drive is to be made of DC-DC switch power source; Because the closed-loop adjustment effect of DC-DC switch power source, the output current of LED drive can be a Constant Direct Current electric current.Switching Power Supply has quite high efficient, and promptly its input power is substantially equal to power output.Again because the voltage and the current constant of light-emitting diode, the driving power that is light-emitting diode is constant, the input current that can draw this LED drive is the variation that is inversely proportional to of the input voltage with this LED drive, that is to say, the input impedance of this LED drive is a nonlinear impedance, it is not to present pure linear resistance property along with the input voltage of this LED drive increases and increases.Because the input nonlinear impedance feature of this LED drive makes this LED drive not work with the normal compatibility of all electronic transformers well, thereby makes light-emitting diode that flicker be arranged.
Summary of the invention
The technical problem to be solved in the present invention provide a kind of can be used to replace low pressure MR16 incandescent lamp and with the LED driving circuit of all electromagnetic transformers and the normal compatible work of electronic transformer; It can solve LED drive can not be well with all electromagnetic transformers and the normal compatible application problem of working of electronic transformer.
In order to solve the problems of the technologies described above, the invention provides a kind of LED driving circuit that is used to replace the low-voltage alternating-current incandescent lamp, comprise the LED driving circuit of electromagnetic transformers or electronic transformer and low-voltage alternating-current input, also comprise the input current correcting circuit; Electromagnetic transformers or electronic transformer, input current correcting circuit and the LED driving circuit of low-voltage alternating-current input link to each other successively;
The input current correcting circuit provides a corresponding compensation electric current according to the input voltage and the frequency at input current correcting circuit two ends;
The LED driving circuit of low-voltage alternating-current input provides the Constant Direct Current that presets electric current to LED load;
The input current that offset current and LED driving circuit input voltage by low-voltage alternating-current input produce is combined to form the load current of electromagnetic transformers or electronic transformer; Load current can make electromagnetic transformers or electronic transformer operate as normal.
As the improvement that is used to replace the LED driving circuit of low-voltage alternating-current incandescent lamp of the present invention: the offset current of input current correcting circuit can make the condition of electromagnetic transformers or electronic transformer operate as normal be:
When being electronic transformer, the load current that makes electronic transformer is an inductance current;
When being electromagnetic transformers, the load current that makes electromagnetic transformers is a capacity current.
As the further improvement that is used to replace the LED driving circuit of low-voltage alternating-current incandescent lamp of the present invention: the input current correcting circuit is an impedor with frequency change.
As the further improvement that is used to replace the LED driving circuit of low-voltage alternating-current incandescent lamp of the present invention: the input current correcting circuit comprises inductance L and capacitor C; Inductance L and capacitor C are series connection, and the two ends of this series circuit are parallel to the output of electromagnetic transformers or electronic transformer, the two ends of this series circuit and be parallel to the input of the LED driving circuit of low-voltage alternating-current input.
As the further improvement that is used to replace the LED driving circuit of low-voltage alternating-current incandescent lamp of the present invention: the input current correcting circuit also comprises resistance R, connects with capacitor C after resistance R and the inductance L parallel connection again; The two ends of this series circuit are parallel to the output of electromagnetic transformers or electronic transformer, the two ends of this series circuit and be parallel to the input of the LED driving circuit of low-voltage alternating-current input.
Particularly: the present invention is the LED driving circuit that comprises input current correcting circuit and low-voltage alternating-current commonly used input, and the input current correcting circuit is to provide a corresponding compensation electric current according to its system's input voltage and frequency; The LED driving circuit of low-voltage alternating-current input commonly used provides the Constant Direct Current that presets electric current to LED load; The input current of its system's input voltage generation of offset current and the LED driving circuit of being imported by low-voltage alternating-current commonly used is combined to form the load current of electromagnetic transformers and electronic transformer; This load current can make electromagnetic transformers and electronic transformer operate as normal.The input current correcting circuit can provide a corresponding compensation electric current according to its input voltage and frequency.It is that to make the load current of this electronic transformer be an inductance current that the offset current of input current correcting circuit can make the condition of electronic transformer operate as normal.The input current correcting circuit is an impedor with frequency change, the input current correcting circuit can be simply by inductance L, capacitor C be with or without resistance R and form.
Advantage of the present invention is to make LED driving circuit commonly used and all electromagnetic transformers and electronic transformer operate as normal.
Advantage of the present invention is to make electronic transformer work in best operating condition, i.e. the load of electronic transformer is an inductance current load.
Advantage of the present invention is to keep the power switch in the electronic transformer to work under the zero voltage switch condition.
Advantage of the present invention is can make the output voltage increase of electronic transformer and increase its corresponding inductance current to reduce input current to remedy LED driving circuit commonly used owing to its system's input voltage increases.
Description of drawings
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
Fig. 1 is the block diagram that is used to replace low-voltage alternating-current MR16 incandescent lamp and constitutes with the LED driving circuit of all electronic transformer operate as normal of the present invention;
Fig. 2 of the present inventionly is used to replace low-voltage alternating-current MR16 incandescent lamp and constitutes the circuit diagram of specific embodiment 1 with the LED driving circuit of all electronic transformer operate as normal.
Fig. 3 of the present inventionly is used to replace low-voltage alternating-current MR16 incandescent lamp and constitutes the circuit diagram of specific embodiment 2 with the LED driving circuit of all electronic transformer operate as normal;
Among Fig. 1～Fig. 3: 1----electromagnetic transformers or electronic transformer, 2----input current correcting circuit, 3----LED driving circuit;
Embodiment
For electromagnetic transformers and electronic transformer, both operating frequencies have huge difference.The operating frequency of electromagnetic transformers is mains frequency 50Hz or 60Hz.And the operating frequency of electronic transformer is about about 45KHz.The two frequency has the poor of three orders of magnitude.When the inductance L in the input current correcting circuit 2 and capacitor C value during at mains frequency 50Hz or 60Hz, inductance L is equivalent to short circuit and capacitor C presents high impedance; And capacitor C is equivalent to short circuit and inductance L presents lower emotional resistance when 45KHz.
Because the said frequencies impedance operator of input current correcting circuit 2, make input current correcting circuit 2 when mains frequency 50Hz or 60Hz, present open circuit substantially, i.e. electromagnetic transformers big substantially without comparison extracurrent except the input current of the LED driving circuit 3 of low-voltage alternating-current input.Because the said frequencies impedance operator of input current correcting circuit 2, also make input current correcting circuit 2 when 45KHz, present lower emotional resistance, be electronic transformer except the input current of the LED driving circuit 3 of output low-voltage alternating-current input, also have bigger inductance current.For example: L=100uH, C=1uF, the impedance frequency characteristic of this input current correcting circuit 2 is:
When being mains frequency 60Hz,
Z(jω)＝jωL-j/ωC＝j0.03768-j2653.9＝-j2653.89
When mains frequency 60Hz, this high capacitive reactances produces quite little electric current to 12V AC just, and this is equivalent to this input current correcting circuit 2 open circuits.For electromagnetic transformers, this input current correcting circuit 2 does not extract electric current from electromagnetic transformers substantially.
When being 45KHz,
Z(jω)＝jωL-j/ωC＝j28.26-j3.538＝j24.722
When 45KHz, the impedance phase of capacitor C can be considered short circuit when low.Inductance L is the main impedance component of input current correcting circuit 2 and present emotional resistance.This lower emotional resistance produces enough big inductance current and can guarantee that the power switch of electronic transformer can work under the zero voltage switch condition just.And this electronic transformer can be finished normal transformation function, thereby makes the LED driving circuit 3 of low-voltage alternating-current input commonly used can have enough input powers to come the driven for emitting lights diode load, and constant DC stream or square wave current promptly are provided.
Its operation principle to the circuit diagram one of instantiation 1 is similar, and selected inductance L and resistance R value present Low ESR when mains frequency 50Hz or 60Hz, and promptly inductance L and resistance R parallel branch can be considered short circuit.And select the capacitor C value to make it when mains frequency 50Hz or 60Hz, present the capacitive high impedance.And when 45KHz, the impedance phase of electric capacity can be considered short circuit when low.
This makes input current correcting circuit 2 present lower inductance-resistive impedance, because this frequency impedance characteristic of input current correcting circuit 2, this makes input current correcting circuit 2 present open circuit substantially when mains frequency 50Hz or 60Hz, i.e. electromagnetic transformers big substantially without comparison extracurrent except the input current of the LED driving circuit 3 of low-voltage alternating-current input.This can make input current correcting circuit 2 present lower inductance-resistive impedance again when 45KHz, be electronic transformer except the input current of the LED driving circuit 3 of low-voltage alternating-current input, also have a little resistive electric current and a bigger inductance current to combine an inductance current.This makes electronic transformer can finish normal transformation function, thereby makes the light-emitting diode of low-voltage alternating-current input commonly used drive electricity, and 3 can have enough input powers to come the driven for emitting lights diode load, and constant DC stream or square wave current promptly are provided.
Because the effect of input current correcting circuit 2, it make the input of this low-voltage alternating-current LED drive (promptly, the LED driving circuit 3 of low-voltage alternating-current input) can not be overcome with the normal compatible problem of working of all electronic transformers well, thereby be made not flicker of light-emitting diode.
At last, it is also to be noted that what more than enumerate only is several specific embodiments of the present invention.Obviously, the invention is not restricted to above embodiment, many distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention all should be thought protection scope of the present invention.
Claims (5)
1. be used to replace the LED driving circuit of low-voltage alternating-current incandescent lamp, comprise the LED driving circuit (3) of electromagnetic transformers or electronic transformer (1) and low-voltage alternating-current input, it is characterized in that: also comprise input current correcting circuit (2); Described electromagnetic transformers or electronic transformer (1), input current correcting circuit (2) and the LED driving circuit (3) of low-voltage alternating-current input link to each other successively;
Described input current correcting circuit (2) provides a corresponding compensation electric current according to the input voltage and the frequency at input current correcting circuit (2) two ends;
The LED driving circuit (3) of described low-voltage alternating-current input provides the Constant Direct Current that presets electric current to LED load;
The input current that described offset current and LED driving circuit (3) input voltage by low-voltage alternating-current input produce is combined to form the load current of electromagnetic transformers or electronic transformer (1); Described load current can make electromagnetic transformers or electronic transformer (1) operate as normal.
2. the LED driving circuit that is used to replace the low-voltage alternating-current incandescent lamp according to claim 1 is characterized in that: the offset current of described input current correcting circuit (2) can make the condition of electromagnetic transformers or electronic transformer (1) operate as normal be:
When being electronic transformer, the load current that makes described electronic transformer is an inductance current;
When being electromagnetic transformers, the load current that makes described electromagnetic transformers is a capacity current.
3. the LED driving circuit that is used to replace the low-voltage alternating-current incandescent lamp according to claim 1 and 2 is characterized in that: described input current correcting circuit (2) is an impedor with frequency change.
4. the LED driving circuit that is used to replace the low-voltage alternating-current incandescent lamp according to claim 3 is characterized in that: described input current correcting circuit (2) comprises inductance L and capacitor C; Described inductance L and capacitor C are series connection, and the two ends of this series circuit are parallel to the output of electromagnetic transformers or electronic transformer (1), the two ends of this series circuit and be parallel to the input of the LED driving circuit (3) of low-voltage alternating-current input.
5. the LED driving circuit that is used to replace the low-voltage alternating-current incandescent lamp according to claim 4 is characterized in that: described input current correcting circuit (2) also comprises resistance R, connects with capacitor C after described resistance R and the inductance L parallel connection again; The two ends of this series circuit are parallel to the output of electromagnetic transformers or electronic transformer (1), the two ends of this series circuit and be parallel to the input of the LED driving circuit (3) of low-voltage alternating-current input.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110149909XA CN102291882A (en) | 2011-06-04 | 2011-06-04 | LED (Light Emitting Diode) drive circuit for replacing low-voltage AC (Alternating Current) incandescent lamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110149909XA CN102291882A (en) | 2011-06-04 | 2011-06-04 | LED (Light Emitting Diode) drive circuit for replacing low-voltage AC (Alternating Current) incandescent lamp |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103379716A (en) * | 2013-07-15 | 2013-10-30 | 魏其萃 | LED drive circuit compatible with electronic transformer and silicon-controlled dimmer and method |
| US20180245974A1 (en) * | 2017-01-26 | 2018-08-30 | Truly Green Solutions, LLC | Method for measuring light for led replacement |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101640966A (en) * | 2009-09-07 | 2010-02-03 | 江阴瑞福得电器有限公司 | Power supply circuit of fluorescent lamp |
| TW201019786A (en) * | 2008-11-10 | 2010-05-16 | Shih-Yuan Wang | An apparatus improved the light-flick problem of LED load was applied to electronic transformer |
| US20110109249A1 (en) * | 2009-11-10 | 2011-05-12 | Green Mark Technology Inc. | Dimmable led lamp and dimmable led lighting apparatus |
-
2011
- 2011-06-04 CN CN201110149909XA patent/CN102291882A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201019786A (en) * | 2008-11-10 | 2010-05-16 | Shih-Yuan Wang | An apparatus improved the light-flick problem of LED load was applied to electronic transformer |
| CN101640966A (en) * | 2009-09-07 | 2010-02-03 | 江阴瑞福得电器有限公司 | Power supply circuit of fluorescent lamp |
| US20110109249A1 (en) * | 2009-11-10 | 2011-05-12 | Green Mark Technology Inc. | Dimmable led lamp and dimmable led lighting apparatus |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103379716A (en) * | 2013-07-15 | 2013-10-30 | 魏其萃 | LED drive circuit compatible with electronic transformer and silicon-controlled dimmer and method |
| US20180245974A1 (en) * | 2017-01-26 | 2018-08-30 | Truly Green Solutions, LLC | Method for measuring light for led replacement |
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Application publication date: 20111221 |