CN110831286A - Circuit and method for removing slight brightness of LED lamp and LED lamp - Google Patents
Circuit and method for removing slight brightness of LED lamp and LED lamp Download PDFInfo
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- CN110831286A CN110831286A CN201911264109.5A CN201911264109A CN110831286A CN 110831286 A CN110831286 A CN 110831286A CN 201911264109 A CN201911264109 A CN 201911264109A CN 110831286 A CN110831286 A CN 110831286A
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- 239000003990 capacitor Substances 0.000 claims abstract description 51
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- 239000011324 bead Substances 0.000 description 4
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- 238000004134 energy conservation Methods 0.000 description 1
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Abstract
The invention relates to the technical field of LEDs, in particular to a circuit and a method for removing slight brightness of an LED lamp and the LED lamp. The invention discloses a circuit and a method for removing micro-brightness of an LED lamp and the LED lamp, wherein the circuit for removing micro-brightness of the LED lamp is suitable for the LED lamp with a grounded shell and comprises an LED driving power supply, the output end of the LED driving power supply is connected with an LED light source, the circuit further comprises a bypass capacitor, the first end of the bypass capacitor is connected with the output anode of the LED driving power supply, the second end of the bypass capacitor is grounded, and the capacitive reactance of the bypass capacitor is smaller than that of a distributed capacitor between the LED light source and the shell. The invention can remove the phenomenon that the LED lamp is slightly bright after being turned off, improves the visual quality effect of the product, has simple method and low cost, is not limited by circuit topology in application, and has certain effect of protecting the LED in the aspect of voltage resistance test of the product.
Description
Technical Field
The invention belongs to the technical field of LEDs, and particularly relates to a circuit and a method for removing slight brightness of an LED lamp and the LED lamp.
Background
Compared with common lamps (incandescent lamps and the like), the LED lamp has the advantages of high brightness, energy conservation, long service life, good applicability, short response time, environmental protection and the like, so the LED lamp is widely applied to illumination in various fields, such as indoor illumination, commercial illumination display, LED backlight sources, decorative illumination, display screens and other illumination.
For some LED lamps, the casing has conductive performance and is grounded, for example, an LED panel lamp, the panel and related structures thereof are made of metal or other semiconductor materials and are grounded, so a distributed capacitor Cparasitic exists between the LED lamp bead and the casing, as shown in fig. 1, a resistor Rpe is impedance between the casing and the ground, when a driving power supply of the LED lamp is turned off, a leakage current with an alternating current component exists, and the alternating current component of the leakage current forms a loop with the casing through the LED lamp bead, the distributed capacitor Cparasitic, so that the LED lamp bead can be just turned on, and a bright phenomenon occurs. This is more likely to occur if the LED output loop voltage is high or if the loop is floating.
The common practice in the industry to remove the phenomenon of the dim brightness of the LED panel is: whether a single-stage circuit (such as a BUCK circuit or a BUCK boost circuit) or a double-stage circuit (such as an APFC + FLYBACK circuit, a FLYBACK + BUCK circuit or a PPFC + HB circuit) is adopted, a common-ground loop mode is generally adopted, and the output loop voltage during switching is reduced as much as possible to remove the phenomenon of slight brightness of an LED lamp, but the method limits the application range of a circuit architecture.
Disclosure of Invention
The invention aims to provide a circuit and a method for removing slight brightness of an LED lamp and the LED lamp thereof to solve the existing technical problems.
In order to achieve the purpose, the invention adopts the technical scheme that: the circuit for removing the slight brightness of the LED lamp is suitable for the LED lamp grounded by the shell and comprises an LED driving power supply, wherein the output end of the LED driving power supply is connected with an LED light source, the circuit further comprises a bypass capacitor, the first end of the bypass capacitor is connected with the output anode of the LED driving power supply, the second end of the bypass capacitor is grounded, and the capacitive reactance of the bypass capacitor is smaller than that of a distributed capacitor between the LED light source and the shell.
Further, the second terminal of the bypass capacitor is connected to a power ground.
Further, the second end of the bypass capacitor is connected to the housing and thus grounded.
Furthermore, the withstand voltage value of the bypass capacitor is larger than 400V.
Further, the bypass capacitor has a capacitance greater than 1 nF.
Further, the LED driving power supply is an isolated LED driving power supply.
The invention also provides an LED lamp which is provided with the circuit for removing the slight brightness of the LED lamp.
The invention also provides a method for removing the slight brightness of the LED lamp, which is suitable for the LED lamp with the grounded shell and comprises the following steps: and the output positive electrode of the LED driving power supply is grounded through a bypass capacitor, and the capacitive reactance of the bypass capacitor is smaller than that of the distributed capacitor between the LED light source and the shell.
Furthermore, the output anode of the LED driving power supply is connected with the power ground through a bypass capacitor.
Furthermore, the output anode of the LED driving power supply is connected with the shell through a bypass capacitor so as to be grounded.
The invention has the beneficial technical effects that:
the invention can effectively remove the phenomenon that the LED lamp is slightly bright after being turned off, improves the visual quality effect of the product, has simple method and low cost, is not limited by circuit topology in application, and has certain effect of protecting the LED in the aspect of voltage resistance test of the product.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a circuit diagram of a conventional LED panel lamp;
fig. 2 is a circuit diagram of an embodiment of the present invention.
Detailed Description
To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The invention will now be further described with reference to the accompanying drawings and detailed description.
The invention discloses a method for removing slight brightness of an LED lamp, which is suitable for the LED lamp with a grounded shell and comprises the following steps: and the output positive electrode of the LED driving power supply is grounded through a bypass capacitor, and the capacitive reactance of the bypass capacitor is smaller than that of the distributed capacitor between the LED light source and the shell.
Specifically, in this embodiment, the output positive electrode of the LED driving power is connected to the power ground through the bypass capacitor or connected to the housing through the bypass capacitor so as to be grounded.
In this embodiment, the LED driving power supply is an isolated LED driving power supply, but in other embodiments, the LED driving power supply may also be a non-isolated LED driving power supply, and the LED driving power supply may be applied as long as the output end has a leakage current with an ac component when the LED driving power supply is turned off.
As shown in fig. 2, the present invention further discloses a circuit for removing the slight brightness of the LED lamp, which is suitable for the LED lamp with the grounded housing.
The LED driving power supply comprises an LED driving power supply 1, wherein the output end of the LED driving power supply 1 is connected with an LED light source 2, the LED driving power supply further comprises a bypass capacitor C55, the first end of the bypass capacitor C55 is connected with the output anode LED + of the LED driving power supply 1, the second end of the bypass capacitor C55 is grounded, and the capacitive reactance of the bypass capacitor C55 is smaller than that of a distributed capacitor Cparasidic between the LED light source 2 and a shell.
In this embodiment, the LED driving power supply 1 is an isolated LED driving power supply and has a PWM signal dimming chip U2, and the specific circuit is shown in fig. 2, which is not described in detail. Of course, in other embodiments, the LED driving power supply 1 may be other existing isolated LED driving power supplies or non-isolated LED driving power supplies, and may be applied as long as the output end has a leakage current with an ac component when the LED driving power supply is turned off.
In this embodiment, the LED light source 2 is formed by connecting a plurality of LED lamp beads in series and parallel, but not limited thereto.
Specifically, the second terminal of the bypass capacitor C55 may be grounded by being connected to a power ground, or may be grounded by being connected to the housing.
In this embodiment, the voltage withstanding value of the bypass capacitor C55 is preferably greater than 400V, so as to improve the voltage withstanding capability thereof, thereby improving the reliability and safety of the circuit, but not limited thereto.
In this embodiment, the capacity of the bypass capacitor C55 is preferably greater than 1nF, so as to better drain the leaky battery, but not limited thereto.
The working process is as follows:
when the resistor R11 obtains an OFF signal, the output current of the LED driving power supply 1 is zero, and the leakage current (which is alternating current) passing through the safety Y capacitor CY1 is preferentially discharged to the ground through the bypass capacitor C55, so that the voltage of the output anode LED + of the LED driving power supply 1 is reduced, the LED driving power supply cannot drive the LED light source 2 to be turned on, and the phenomenon of micro-lighting of the LED panel lamp is eliminated.
The invention also provides an LED lamp which is provided with the circuit for removing the slight brightness of the LED lamp. In this embodiment, the LED lamp is an LED panel lamp, but is not limited thereto.
The invention can effectively remove the phenomenon that the LED lamp is slightly bright after being turned off, improves the visual quality effect of the product, has simple method and low cost, is not limited by the topology of the circuit in application, and simultaneously has a certain effect of protecting the LED in the aspect of the voltage resistance test of the product by the bypass capacitor C55.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a get rid of circuit that LED lamp is little bright, is applicable to the LED lamp of casing ground connection, includes LED drive power supply, LED drive power supply's output termination LED light source, its characterized in that: the LED driving power supply further comprises a bypass capacitor, the first end of the bypass capacitor is connected with the output anode of the LED driving power supply, the second end of the bypass capacitor is grounded, and the capacitive reactance of the bypass capacitor is smaller than that of a distributed capacitor between the LED light source and the shell.
2. The circuit for removing the slight brightness of the LED lamp according to claim 1, wherein: the second end of the bypass capacitor is connected with the power ground.
3. The circuit for removing the slight brightness of the LED lamp according to claim 1, wherein: the second end of the bypass capacitor is connected to the housing and thus to ground.
4. The circuit for removing the slight brightness of the LED lamp according to claim 1, wherein: the withstand voltage value of the bypass capacitor is larger than 400V.
5. The circuit for removing the slight brightness of the LED lamp according to claim 1, wherein: the bypass capacitor has a capacitance greater than 1 nF.
6. The circuit for removing the slight brightness of the LED lamp according to claim 1, wherein: the LED driving power supply is an isolated LED driving power supply.
7. An LED lamp, characterized in that: the circuit for removing the slight brightness of the LED lamp is provided according to any one of claims 1 to 6.
8. A method for removing slight brightness of an LED lamp is suitable for the LED lamp with a grounded shell, and is characterized by comprising the following steps: and the output positive electrode of the LED driving power supply is grounded through a bypass capacitor, and the capacitive reactance of the bypass capacitor is smaller than that of the distributed capacitor between the LED light source and the shell.
9. The method of claim 8, wherein the step of removing the slight brightness of the LED lamp comprises the following steps: and the output anode of the LED driving power supply is connected with the power ground through a bypass capacitor.
10. The method of claim 8, wherein the step of removing the slight brightness of the LED lamp comprises the following steps: the output anode of the LED driving power supply is connected with the shell through the bypass capacitor so as to be grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911264109.5A CN110831286A (en) | 2019-12-10 | 2019-12-10 | Circuit and method for removing slight brightness of LED lamp and LED lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911264109.5A CN110831286A (en) | 2019-12-10 | 2019-12-10 | Circuit and method for removing slight brightness of LED lamp and LED lamp |
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| CN110831286A true CN110831286A (en) | 2020-02-21 |
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| CN201911264109.5A Pending CN110831286A (en) | 2019-12-10 | 2019-12-10 | Circuit and method for removing slight brightness of LED lamp and LED lamp |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100270935A1 (en) * | 2009-04-24 | 2010-10-28 | Toshiba Lighting & Technology Corporation | Light-emitting device and illumination apparatus |
| JP2014232621A (en) * | 2013-05-29 | 2014-12-11 | 株式会社小糸製作所 | Light source control device |
| CN207543365U (en) * | 2017-07-13 | 2018-06-26 | 惠州良信智能科技有限公司 | A kind of LED lamp drive circuit that can be discharged dark current |
| CN108471654A (en) * | 2018-05-03 | 2018-08-31 | 海宁福得电器有限公司 | A kind of anti-glimmer non-isolation type driving LED ceiling lamp tool |
| CN110461071A (en) * | 2019-09-16 | 2019-11-15 | 杭州上达光电科技有限公司 | A kind of LED lamp protection circuit |
-
2019
- 2019-12-10 CN CN201911264109.5A patent/CN110831286A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100270935A1 (en) * | 2009-04-24 | 2010-10-28 | Toshiba Lighting & Technology Corporation | Light-emitting device and illumination apparatus |
| JP2014232621A (en) * | 2013-05-29 | 2014-12-11 | 株式会社小糸製作所 | Light source control device |
| CN207543365U (en) * | 2017-07-13 | 2018-06-26 | 惠州良信智能科技有限公司 | A kind of LED lamp drive circuit that can be discharged dark current |
| CN108471654A (en) * | 2018-05-03 | 2018-08-31 | 海宁福得电器有限公司 | A kind of anti-glimmer non-isolation type driving LED ceiling lamp tool |
| CN110461071A (en) * | 2019-09-16 | 2019-11-15 | 杭州上达光电科技有限公司 | A kind of LED lamp protection circuit |
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Application publication date: 20200221 |