CN111343767B - LED bleeder circuit and LED drive circuit - Google Patents
LED bleeder circuit and LED drive circuit Download PDFInfo
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- CN111343767B CN111343767B CN202010209813.7A CN202010209813A CN111343767B CN 111343767 B CN111343767 B CN 111343767B CN 202010209813 A CN202010209813 A CN 202010209813A CN 111343767 B CN111343767 B CN 111343767B
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Abstract
The invention provides an LED bleeder circuit and an LED drive circuit, comprising: a zener diode and a series element; the cathode of the Zener diode is connected with one end of the series element in series; the other end of the series element is connected between the cathode of the LED and the boosting driving chip; the anode of the Zener diode is connected with a signal ground. The invention can maintain the stable working output of the circuit, avoid the flickering phenomenon of the LED, provide a release loop for the cathode of the LED and absorb the peak voltage.
Description
Technical Field
The invention relates to the field of electronic circuits, in particular to an LED (light emitting diode) bleeder circuit and an LED drive circuit.
Background
The light emitting diode is a commonly used light emitting device, emits light by energy released by recombination of electrons and holes, and is widely applied in the field of illumination. Light emitting diodes (leds) can efficiently convert electrical energy into light energy, and as technology advances, leds have been widely used for displays and lighting.
In patent documents CN109743818A and CN107396492A, referring to fig. 3 and 4 of the present invention, a loop is formed by output C1-LED-Q2-GND of a boost circuit, when the detection voltage of the LED cathode is lower than a set value, and the dummy load R1 is switched, due to the turn-off of Q2, the energy of L1 cannot suddenly change due to the law of energy conservation, the LED cathode will generate a certain spike voltage, so that the detection voltage is higher than the set value again, and the output will be switched back and forth between the LED cathode and the dummy load R1, causing the LED to flicker, as shown in fig. 1.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an LED bleeder circuit and an LED driving circuit.
According to the invention, the LED bleeder line comprises: a zener diode and a series element;
the cathode of the Zener diode is connected with one end of the series element in series;
the other end of the series element is connected between the cathode of the LED and the boosting driving chip;
the anode of the Zener diode is connected with a signal ground.
Preferably, the series element comprises: a diode or a resistor.
Preferably, the boost driving chip includes: the device comprises an NMOS tube Q1, an NMOS tube Q2, a boosting drive circuit, a dummy load circuit and a ripple removing circuit;
the voltage of the zener diode is lower than the detection voltage of the dummy load circuit.
Preferably, the boost driving circuit is connected to a gate of an NMOS transistor Q1, a source of the NMOS transistor Q1 is connected to a signal ground, a source of the NMOS transistor Q2 is connected to a signal ground, and a drain of the NMOS transistor Q2 is connected to a negative electrode of the LED and the other end of the series element.
The LED driving circuit provided by the invention comprises the LED bleeder circuit.
Preferably, the method further comprises the following steps: the LED lamp comprises an inductor L1, a diode D1, a capacitor C1, a resistor R1 and an LED;
the positive electrode of a power supply is connected with one end of the inductor L1 through a rectifying circuit, the other end of the inductor L1 is respectively connected with the drain electrode of the NMOS tube Q1 and one end of the diode D1, and the other end of the diode is respectively connected with one end of the capacitor C1, one end of the resistor R1 and the positive electrode of the LED;
the other end of the capacitor C1 is connected with a signal ground, and the other end of the resistor R1 is connected with a dummy load circuit of the boosting driving chip.
Compared with the prior art, the invention has the following beneficial effects:
the invention can maintain the stable working output of the circuit, avoid the flickering phenomenon of the LED, provide a release loop for the cathode of the LED and absorb the peak voltage.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a dummy load circuit trigger voltage waveform of a conventional LED driver circuit;
FIG. 2 is a circuit diagram of an LED driving circuit of the present invention;
FIG. 3 is a circuit diagram of a first embodiment of the LED bleeder line of the present invention;
FIG. 4 is a circuit diagram of a second embodiment of the LED bleeder line of the present invention;
FIG. 5 is a dummy load circuit trigger voltage waveform of the LED driver circuit of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
As shown in fig. 2, the present invention provides an LED bleeder circuit, including: the LED driving circuit comprises a Zener diode and a series element, wherein the cathode of the Zener diode is connected with one end of the series element in series, the other end of the series element is connected between the cathode of the LED and the boosting driving chip, and the anode of the Zener diode is connected with a signal ground. In the present embodiment, the boosting driver chip is a DS9581D chip.
As shown in fig. 3 and 4, the series element includes: a diode or a resistor. The boost driving chip includes: the voltage of the Zener diode is lower than the detection voltage of the dummy load circuit. The boosting driving circuit is connected with the grid electrode of an NMOS tube Q1, the source electrode of the NMOS tube Q1 is connected with a signal ground, the source electrode of the NMOS tube Q2 is connected with the signal ground, and the drain electrode of the NMOS tube Q2 is connected with the negative electrode of the LED and the other end of the series element.
As shown in fig. 2, the LED driving circuit provided by the present invention includes the LED bleeding circuit, and further includes: inductor L1, diode D1, capacitor C4, resistor R1 and LED.
The positive electrode of the power supply is connected with one end of an inductor L1 through a rectifying circuit, the other end of the inductor L1 is respectively connected with the drain electrode of an NMOS transistor Q1 and one end of a diode D1, and the other end of the diode is respectively connected with one end of a capacitor C4, one end of a resistor R1 and the positive electrode of the LED. The other end of the capacitor C4 is connected with a signal ground, and the other end of the resistor R1 is connected with a dummy load circuit of the boosting driving chip.
U1 is a boost drive chip, has integrateed boost control system, dummy load switching system, has removed the ripple system. The positive pole of the power supply is connected with one end of an inductor L1 through a rectifying circuit, the other end of the inductor is connected with an LX1 (built-in MOS switch) of a U1, the other end of the inductor is connected with one end of a detection resistor R1 through a signal ground SGND of the U1, and the other end of a resistor R1 is connected with the negative end of a rectifying bridge. And meanwhile, a diode D1, an electrolytic C4, a load LED, an LX2 (with a built-in ripple removing MOS) of U1, a resistor R3 and an SGND are connected. When the input source voltage is turned down, the voltage generated by the LED-acts as an important detection voltage point, and as the voltage of the LED-is lower than the detection voltage for turning on the U1BLD (built-in switch line), the LED-terminal will generate a spike voltage as shown in fig. 1, which causes the current to switch back and forth between R2 and the LED load, causing a flicker phenomenon. The LED-connecting diode D2 and the voltage regulator tubes D3 to SGND can absorb the peak voltage generated by the LED, as shown in figure 5, the invention breaks the dynamic balance between the dummy load and the LED load and effectively solves the LED flicker phenomenon.
In the LED driving circuit, the existing voltage and current are small, complex control circuits such as MOS (metal oxide semiconductor) and the like are not needed, and although the LED driving circuit is formed by combining 2 simple devices, the original dynamic balance can be broken through in the complex application of the whole dimming system, so that a new loop is formed. (in a pure boost circuit, indicator, Diode, CAP, R form a loop, and the two devices form their own loop on the basis of this).
In addition, the circuit can protect the pin protection function of the chip VC2, and can also play a role in quickly and dynamically adjusting the system in the dimming process, so that the circuit has the indispensable function in the dimming system and must independently exist at the periphery, the parameters of the circuit are conveniently adjusted, and if the circuit is directly arranged in the chip, the withstand voltage limit is generated, and the parameter adjustment is difficult to achieve or not good.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (2)
1. An LED bleeder circuit, comprising: a zener diode and a series element;
the cathode of the Zener diode is connected with one end of the series element in series;
the other end of the series element is connected between the cathode of the LED and the boosting driving chip;
the anode of the Zener diode is connected with a signal ground;
the series element comprises: a diode or a resistor;
the boost driving chip comprises: the device comprises an NMOS tube Q1, an NMOS tube Q2, a boosting drive circuit, a dummy load circuit and a ripple removing circuit;
the voltage of the Zener diode is lower than the detection voltage of the dummy load circuit;
the boosting driving circuit is connected with the grid electrode of an NMOS tube Q1, the source electrode of the NMOS tube Q1 is connected with a signal ground, the source electrode of the NMOS tube Q2 is connected with a signal ground, and the drain electrode of the NMOS tube Q2 is connected with the negative electrode of the LED and the other end of the series element;
further comprising: the LED lamp comprises an inductor L1, a diode D1, a capacitor C1, a resistor R1 and an LED;
the positive electrode of a power supply is connected with one end of the inductor L1 through a rectifying circuit, the other end of the inductor L1 is respectively connected with the drain electrode of the NMOS tube Q1 and one end of the diode D1, and the other end of the diode is respectively connected with one end of the capacitor C1, one end of the resistor R1 and the positive electrode of the LED;
the other end of the capacitor C1 is connected with a signal ground, and the other end of the resistor R1 is connected with a dummy load circuit of the boosting driving chip.
2. An LED driver circuit comprising the LED bleeder circuit of claim 1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010209813.7A CN111343767B (en) | 2020-03-23 | 2020-03-23 | LED bleeder circuit and LED drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010209813.7A CN111343767B (en) | 2020-03-23 | 2020-03-23 | LED bleeder circuit and LED drive circuit |
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| Publication Number | Publication Date |
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| CN111343767A CN111343767A (en) | 2020-06-26 |
| CN111343767B true CN111343767B (en) | 2022-03-11 |
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| CN202010209813.7A Active CN111343767B (en) | 2020-03-23 | 2020-03-23 | LED bleeder circuit and LED drive circuit |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102141206A (en) * | 2010-01-28 | 2011-08-03 | 中山兴瀚科技有限公司 | Series LED light source with bypass protection |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN204681643U (en) * | 2015-06-03 | 2015-09-30 | 中山市晶得光电有限公司 | With the LED matrix of reverse protection |
| CN205491318U (en) * | 2016-02-05 | 2016-08-17 | 上海顿格电子贸易有限公司 | MR16 shot -light that adoption silicon controlled rectifier ware was adjusted luminance |
| CN207691419U (en) * | 2017-12-01 | 2018-08-03 | 四川巨海渔业科技有限公司 | A kind of circuit released for bus-bar charge |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102141206A (en) * | 2010-01-28 | 2011-08-03 | 中山兴瀚科技有限公司 | Series LED light source with bypass protection |
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Effective date of registration: 20230525 Address after: 201306 building C, No. 888, Huanhu West 2nd Road, Lingang New District, China (Shanghai) pilot Free Trade Zone, Pudong New Area, Shanghai Patentee after: SHANGHAI AOJIAN MICROELECTRONIC TECHNOLOGY Co.,Ltd. Address before: 361000 No. 1, Xiamen Software Park, zengcuolong, Siming District, Xiamen City, Fujian Province Patentee before: Ye Tonglin Patentee before: SHANGHAI AOJIAN MICROELECTRONIC TECHNOLOGY Co.,Ltd. |
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