CN102141204A - LED light emitting device - Google Patents
LED light emitting device Download PDFInfo
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- CN102141204A CN102141204A CN2010101060105A CN201010106010A CN102141204A CN 102141204 A CN102141204 A CN 102141204A CN 2010101060105 A CN2010101060105 A CN 2010101060105A CN 201010106010 A CN201010106010 A CN 201010106010A CN 102141204 A CN102141204 A CN 102141204A
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Abstract
The invention is suitable for the technical field of LEDs, and provides an LED light emitting device which comprises a first LED light emitting unit, a second LED light emitting unit, an LED driving unit, a transformer unit, a half-wave rectification unit and a constant-current source unit for supplying constant current required by the LED light emitting units for emitting light, wherein the cathode end of the first LED light emitting unit is connected with the anode end of the second LED light emitting unit, the input end of the constant-current source unit is connected with the cathode end of the second LED light emitting unit, the output end of the constant-current source unit is connected with the negative output end of the half-wave rectification unit, and the regulating end of the constant-current source unit is connected with the cathode end of the first LED light emitting unit, i.e. the constant-current source unit obtains power from the LED light emitting device to realize the function of constant-current regulation. The LED light emitting device has the advantages of concise circuit design and integral cost and size reduction, and the constant-current source unit adopts a low-voltage-difference constant-current source or constant-current source chip so that the LED light emitting device achieves the purpose of reducing power consumption.
Description
Technical field
The invention belongs to the LED technical field, relate in particular to a kind of LED light-emitting device.
Background technology
Present LED light-emitting device comprises and is used for luminous LED luminescence unit, and the luminous LED luminous controling unit of driving LED luminescence unit, LED luminous controling unit wherein comprises LED driver element, transformer unit, halfwave rectifier unit, constant-current source unit and capacitive filtering unit.This LED light-emitting device drives signal by LED driver element output PWM, this PWM drives signal after the transformation of transformer unit, be rectified into the luminous required signal of telecommunication of LED luminescence unit by the halfwave rectifier unit, and the constant current of LED luminescence unit is provided by the constant-current source unit.
In order to make the constant-current source unit can finish voltage regulation function, the adjustable side of constant-current source unit need connect a voltage, in the LED light-emitting device that prior art provides, the adjustable side of constant-current source unit is to adopt the outside mode of power supply separately to realize, make the line design complexity, increased the design cost and the volume of LED light-emitting device.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of LED light-emitting device, the adjustable side of being intended to solve the constant-current source unit in the LED light-emitting device that prior art provides is to adopt the outside mode of power supply separately to realize, makes line design complexity, the design cost that has increased the LED light-emitting device and the problem of volume.
The embodiment of the invention is to realize like this, a kind of LED light-emitting device, comprise a LED luminescence unit, the 2nd LED luminescence unit, be used to send the LED driver element that PWM drives signal, be used for that described PWM is driven signal and carry out the transformer unit that step-down is handled, be used for that the PWM after the described transformer unit step-down processing is driven signal and carry out the rectification processing, and export to the halfwave rectifier unit of a described LED luminescence unit, and the constant-current source unit that is used to provide the luminous required constant current of a described LED luminescence unit and the 2nd LED luminescence unit, the cathode terminal of a described LED luminescence unit connects the anode tap of described the 2nd LED luminescence unit, the input of described constant-current source unit connects the cathode terminal of described the 2nd LED luminescence unit, the output of described constant-current source unit connects the negative output terminal of described halfwave rectifier unit, and the adjustable side of described constant-current source unit connects the cathode terminal of a described LED luminescence unit.
The LED light-emitting device that the embodiment of the invention provides comprises a LED luminescence unit and the 2nd LED luminescence unit, the anode tap of the 2nd LED luminescence unit connects the cathode terminal of a LED luminescence unit, the adjustable side of constant-current source unit connects the cathode terminal of a LED luminescence unit, that is to say, at this moment, to realize the constant flow regulation function, line design has reduced the cost and the volume of LED light-emitting device integral body succinctly, simultaneously from the power taking of this LED light-emitting device own in the constant-current source unit.In addition, because the constant-current source unit is equivalent to be connected in the output loop of halfwave rectifier unit with a LED luminescence unit at this moment, make the pressure reduction of constant-current source unit be minimized, that is to say, the constant-current source unit adopts the constant-current source or the constant-current source chip of low pressure reduction to get final product, to reach the purpose of saving power consumption.
Description of drawings
Fig. 1 is the structure principle chart of the LED light-emitting device that provides of the embodiment of the invention;
Fig. 2 is the circuit diagram of Fig. 1.
The specific embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The LED light-emitting device that the embodiment of the invention provides comprises a LED luminescence unit and the 2nd LED luminescence unit, the anode tap of the 2nd LED luminescence unit connects the cathode terminal of a LED luminescence unit, and the adjustable side of constant-current source unit connects the cathode terminal of a LED luminescence unit.
Fig. 1 shows the structural principle of the LED light-emitting device that the embodiment of the invention provides, and for convenience of explanation, only shows the part relevant with the embodiment of the invention.
This LED light-emitting device specifically comprises: be respectively applied for a luminous LED luminescence unit 14 and the 2nd LED luminescence unit 15, and the cathode terminal of a LED luminescence unit 14 connects the anode tap of the 2nd LED luminescence unit 15; LED driver element 11 is used to send PWM and drives signal; The transformer unit 12 that connects LED driver element 11, the PWM that is used for that LED driver element 11 is sent drive signal and carry out the step-down processing; Be connected the halfwave rectifier unit 13 between a transformer unit 12 and the LED luminescence unit 14, be used for that the PWM after the transformer unit 12 step-downs processing is driven signal and carry out the rectification processing, and export to a LED luminescence unit 14, the positive output end of halfwave rectifier unit 13 connects the anode tap of a LED luminescence unit 14; Constant-current source unit 15, be used to provide a LED luminescence unit 14 and the 2nd LED luminescence unit 15 luminous required constant currents, the input of constant-current source unit 15 connects the cathode terminal of the 2nd LED luminescence unit 15, and the output of constant-current source unit 15 connects the negative output terminal of halfwave rectifier unit 13.
Line design complicated problems when adopting externally fed for fear of the adjustable side of constant-current source unit 15, in the embodiment of the invention, the adjustable side of constant-current source unit 15 is connected with the cathode terminal of a LED luminescence unit 14, at this moment, this constant-current source unit 15 is when work, the signal of telecommunication of being exported by the cathode terminal of a LED luminescence unit 14 forms pressure reduction in the inside of constant-current source unit 16, that is to say, at this moment, to realize the constant flow regulation function, line design is succinct from the power taking of this LED light-emitting device own in constant-current source unit 15, the cost and the volume of LED light-emitting device integral body have been reduced simultaneously.In addition, because the constant-current source unit is equivalent to be connected in the output loop of halfwave rectifier unit 13 with a LED luminescence unit 14 16 this moments, and the LED in the LED luminescence unit 14 can produce certain pressure drop when luminous, make the pressure reduction of constant-current source unit 16 be minimized, that is to say, constant-current source unit 16 adopts the constant-current source or the constant-current source chip of low pressure reduction to get final product, to reach the purpose of saving power consumption.
Wherein, the one LED luminescence unit 14 and the 2nd LED luminescence unit 15 can comprise at least one LEDs respectively, when a LED luminescence unit 14 and the 2nd LED luminescence unit 15 comprise plurality of LEDs respectively, this plurality of LEDs can be connected in series or connection parallel with one another mutually, can also be being connected of being connected in series and being connected in parallel.
In order to improve the illumination effect of a LED luminescence unit 14 and the 2nd LED luminescence unit 15, the LED light-emitting device that the embodiment of the invention provides also comprises: be connected in parallel on the positive output end of halfwave rectifier unit 13 and the capacitive filtering unit 17 between the negative output terminal.Capacitive filtering unit 17 specifically can be existing electronic devices and components with capacitive filtering function, as: an electric capacity.
Fig. 2 shows the circuit of Fig. 1.
Wherein, transformer unit 12 comprises the transformer B1 that is made of primary coil N1, primary coil N2 and secondary coil N3.The end of primary coil N1 connects dc source VCC, and the other end of primary coil N1 connects LED driver element 11; The end ground connection of primary coil N2, the other end of primary coil N2 connects LED driver element 11; The two ends of secondary coil N3 connect two inputs of halfwave rectifier unit 13 respectively.
Wherein, LED driver element 11 comprises that LED drives control chip U1, resistance R 1, resistance R 2, capacitor C 1, capacitor C 2 and diode D1.Resistance R 1 one ends connect dc source VCC, the other end of resistance R 1 is by capacitor C 1 ground connection, LED drives the other end of the energization pins VCC connection resistance R 1 of control chip U1, LED drives the grounding pin GND ground connection of control chip U1, LED drives the other end of the signal output pin D connection primary coil N1 of control chip U1, and by this signal output pin D output PWM driving signal, the other end of coil N2 connects the anode of diode D1, the negative electrode of diode D1 is by the other end of resistance R 2 connection resistance R 1, and the negative electrode of diode D1 is simultaneously by capacitor C 2 ground connection.
Wherein, the one LED luminescence unit 14 specifically comprises the LED of at least two head and the tail connections in sequential series, and the anode after the series connection is as the positive output end of the anode tap connection halfwave rectifier unit 13 of a LED luminescence unit 14, and the negative electrode after the series connection connects the adjustable side of the anode tap and the constant-current source unit 16 of the 2nd LED luminescence unit 15 as the cathode terminal of a LED luminescence unit 14.
Wherein, the 2nd LED luminescence unit 15 specifically comprises a LEDs, its anode connects the cathode terminal of a LED luminescence unit 14 as the anode tap of the 2nd LED luminescence unit 15, and its negative electrode connects the input of constant-current source unit 16 as the cathode terminal of the 2nd LED luminescence unit 15.
The LED light-emitting device that the embodiment of the invention provides comprises a LED luminescence unit and the 2nd LED luminescence unit, the anode tap of the 2nd LED luminescence unit connects the cathode terminal of a LED luminescence unit, the adjustable side of constant-current source unit connects the cathode terminal of a LED luminescence unit, that is to say, at this moment, to realize the constant flow regulation function, line design has reduced the cost and the volume of LED light-emitting device integral body succinctly, simultaneously from the power taking of this LED light-emitting device own in the constant-current source unit.In addition, because the constant-current source unit is equivalent to be connected in the output loop of halfwave rectifier unit with a LED luminescence unit at this moment, make the pressure reduction of constant-current source unit be minimized, that is to say, the constant-current source unit adopts the constant-current source or the constant-current source chip of low pressure reduction to get final product, to reach the purpose of saving power consumption.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. LED light-emitting device, comprise a LED luminescence unit, the 2nd LED luminescence unit, be used to send the LED driver element that PWM drives signal, be used for that described PWM is driven signal and carry out the transformer unit that step-down is handled, be used for that the PWM after the described transformer unit step-down processing is driven signal and carry out the rectification processing, and export to the halfwave rectifier unit of a described LED luminescence unit, and the constant-current source unit that is used to provide the luminous required constant current of a described LED luminescence unit and the 2nd LED luminescence unit, the cathode terminal of a described LED luminescence unit connects the anode tap of described the 2nd LED luminescence unit, it is characterized in that, the input of described constant-current source unit connects the cathode terminal of described the 2nd LED luminescence unit, the output of described constant-current source unit connects the negative output terminal of described halfwave rectifier unit, and the adjustable side of described constant-current source unit connects the cathode terminal of a described LED luminescence unit.
2. LED light-emitting device as claimed in claim 1 is characterized in that, described device also comprises:
Be connected in parallel on the positive output end of described halfwave rectifier unit and the capacitive filtering unit between the negative output terminal.
3. LED light-emitting device as claimed in claim 2 is characterized in that, described capacitive filtering unit is an electric capacity.
4. LED light-emitting device as claimed in claim 1 is characterized in that, described transformer unit comprises the transformer B1 that is made of primary coil N1, primary coil N2 and secondary coil N3; The end of primary coil N1 connects a direct current power supply, and the other end of primary coil N1 connects described LED driver element; The end ground connection of primary coil N2, the other end of primary coil N2 connects described LED driver element; The two ends of secondary coil N3 connect two inputs of described halfwave rectifier unit respectively.
5. LED light-emitting device as claimed in claim 4 is characterized in that, described LED driver element comprises that a LED drives control chip, resistance R 1, resistance R 2, capacitor C 1, capacitor C 2 and diode D1; Resistance R 1 one ends connect described dc source, the other end of resistance R 1 is by capacitor C 1 ground connection, described LED drives the other end of the energization pins connection resistance R 1 of control chip, described LED drives the other end of the signal output pin connection primary coil N1 of control chip, the other end of coil N2 connects the anode of diode D1, the negative electrode of diode D1 is by the other end of resistance R 2 connection resistance R 1, and the negative electrode of diode D1 is simultaneously by capacitor C 2 ground connection.
6. as each described LED light-emitting device of claim 1 to 5, it is characterized in that, a described LED luminescence unit comprises at least one LEDs, and when a described LED luminescence unit comprised plurality of LEDs, described plurality of LEDs was connected in series or connection parallel with one another mutually.
7. LED light-emitting device as claimed in claim 6, a described LED luminescence unit comprises the LED of at least two head and the tail connections in sequential series, and the anode after the series connection connects the positive output end of described halfwave rectifier unit as the anode tap of a described LED luminescence unit, and the negative electrode after the series connection connects the adjustable side of the anode tap and the constant-current source unit of described the 2nd LED luminescence unit as the cathode terminal of a described LED luminescence unit.
8. as each described LED light-emitting device of claim 1 to 5, it is characterized in that, described the 2nd LED luminescence unit comprises at least one LEDs, and when described the 2nd LED luminescence unit comprised plurality of LEDs, described plurality of LEDs was connected in series or connection parallel with one another mutually.
9. LED light-emitting device as claimed in claim 8, it is characterized in that, described the 2nd LED luminescence unit comprises a LEDs, the anode of the described LED of described the 2nd LED luminescence unit connects the cathode terminal of a described LED luminescence unit as the anode tap of described the 2nd LED luminescence unit, and the negative electrode of the described LED of described the 2nd LED luminescence unit connects the input of described constant-current source unit as the cathode terminal of described the 2nd LED luminescence unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101060105A CN102141204A (en) | 2010-01-29 | 2010-01-29 | LED light emitting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101060105A CN102141204A (en) | 2010-01-29 | 2010-01-29 | LED light emitting device |
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| Publication Number | Publication Date |
|---|---|
| CN102141204A true CN102141204A (en) | 2011-08-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010101060105A Pending CN102141204A (en) | 2010-01-29 | 2010-01-29 | LED light emitting device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012139290A1 (en) * | 2011-04-14 | 2012-10-18 | 深圳市长运通光电技术有限公司 | Led light-emitting device |
| CN108488642A (en) * | 2018-05-25 | 2018-09-04 | 深圳市明微电子股份有限公司 | A kind of light emitting diode illuminating apparatus and light emitting diode |
-
2010
- 2010-01-29 CN CN2010101060105A patent/CN102141204A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012139290A1 (en) * | 2011-04-14 | 2012-10-18 | 深圳市长运通光电技术有限公司 | Led light-emitting device |
| CN108488642A (en) * | 2018-05-25 | 2018-09-04 | 深圳市明微电子股份有限公司 | A kind of light emitting diode illuminating apparatus and light emitting diode |
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Application publication date: 20110803 |