CN217825431U

CN217825431U - LED drive circuit and LED lamp

Info

Publication number: CN217825431U
Application number: CN202220231097.7U
Authority: CN
Inventors: 王超杰; 蒲纪忠; 曹胜军; 甘彩英; 赵艺佼
Original assignee: CH Lighting Technology Co Ltd
Current assignee: CH Lighting Technology Co Ltd
Priority date: 2022-01-27
Filing date: 2022-01-27
Publication date: 2022-11-15
Anticipated expiration: 2032-01-27

Abstract

The utility model relates to a LED drive circuit and LED lamps and lanterns, LED drive circuit is including rectifier unit, filter unit, power conversion unit and the load that couples in proper order, the rectifier unit is including the first AC input end and the second AC input end that are used for inserting the commercial power, a serial communication port, be provided with first electric capacity between first AC input end and the second AC input end, the withstand voltage of first electric capacity is greater than 500V. The first capacitor absorbs high-frequency impact, and protects the LED drive circuit when the LED drive circuit is mistakenly connected with the ballast, so that the LED drive circuit is prevented from being damaged.

Description

LED drive circuit and LED lamp

Technical Field

The application relates to the technical field of lighting, in particular to an LED driving circuit and an LED lamp.

Background

In the prior art, the LED lamp directly connected to the commercial power is provided with an LED driving circuit. When the LED lamp is connected to the traditional electronic ballast by mistake, the LED lamp can damage the LED driving circuit carried by the LED lamp.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide an LED driving circuit and an LED lamp.

The application provides a LED drive circuit, including rectifier unit, filter unit, power conversion unit and the load that couples in proper order, the rectifier unit is including the first alternating current input end and the second alternating current input end that are used for inserting the commercial power, be provided with first electric capacity between first alternating current input end and the second alternating current input end, withstand voltage of first electric capacity is greater than 500V.

Several alternatives are provided below, but not as an additional limitation to the above general solution, but merely as a further addition or preference, each alternative being combinable individually for the above general solution or among several alternatives without technical or logical contradictions.

Optionally, the withstand voltage of the first capacitor is not less than 630V.

Optionally, the first capacitor is a polypropylene capacitor.

Optionally, the power conversion unit includes a control chip and a peripheral circuit thereof, the control chip includes a chip input end and a chip output end, the chip input end is coupled to the output end of the filtering unit, and the chip output end is coupled to the load.

Optionally, the control chip includes a signal ground, the peripheral circuit includes an output sub-circuit, the output sub-circuit is coupled to the load, and the output sub-circuit includes:

a first inductor, a first end of which is coupled to the output end of the chip, and a second end of which is coupled to the anode of the load;

the anode of the fly-wheel diode is coupled with the cathode of the load, and the cathode of the fly-wheel diode is coupled with the signal grounding terminal;

and one end of the first resistor is coupled with the negative electrode of the freewheeling diode, and the other end of the first resistor is coupled with the output end of the chip.

Optionally, the output sub-circuit includes a post-stage filter circuit, and the post-stage filter circuit includes:

a filter capacitor connected in parallel with the load;

and the sixth resistor is connected with the load in parallel.

Optionally, the output sub-circuit includes a third capacitor, and the third capacitor is connected in parallel with the freewheeling diode.

Optionally, the control chip includes a chip power supply terminal, the peripheral circuit includes an electronic power supply circuit, and the electronic power supply circuit includes:

and one end of the fourth capacitor is coupled with the power supply end of the chip, and the other end of the fourth capacitor is coupled with the negative electrode of the freewheeling diode.

Optionally, the control chip includes a zero current detection terminal, the peripheral circuit includes a detection sub-circuit, and the detection sub-circuit includes:

a first end of the third resistor is coupled with the zero current detection end;

and one end of the fourth resistor is coupled with the second end of the third resistor, and the other end of the fourth resistor is coupled with the anode of the load.

The present application further provides an LED lamp, including: the LED driving circuit comprises a first contact piece, a second contact piece and an LED driving circuit, wherein the first contact piece is electrically connected with a first alternating current input end of the driving circuit, and the second contact piece is electrically connected with a second alternating current input end.

The LED drive circuit and the LED lamp at least have the following technical effects:

the first capacitor absorbs high-frequency impact, and protects the LED drive circuit when the LED drive circuit is mistakenly connected with the ballast, so that the LED drive circuit is prevented from being damaged.

Drawings

Fig. 1 is a schematic block diagram of an LED driving circuit according to an embodiment of the present disclosure;

FIG. 2 is a schematic circuit diagram of a rectifying unit and a filtering unit according to an embodiment of the present disclosure;

fig. 3 is a schematic circuit diagram of a power conversion unit and a load according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of an LED lamp according to an embodiment of the present application.

The reference numbers in the figures are as follows:

100. a rectifying unit; 110. a first AC input; 120. a second AC input; 130. a first capacitor;

200. a filtering unit; 300. a power conversion unit; 400. a load;

510. a first contact member; 520. a second contact member.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It is noted that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In this application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any particular order or number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In this application, the terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a system, article, or apparatus that comprises a list of elements is not necessarily limited to those elements explicitly listed, but may include other elements not expressly listed or inherent to such product or apparatus.

Referring to fig. 1 and 2, an embodiment of the present application provides an LED driving circuit, which includes a rectifying unit 100, a filtering unit 200, a power converting unit 300, and a load 400, which are coupled in sequence. The rectifying unit 100 includes a first ac input end 110 and a second ac input end 120 for receiving a mains supply, a first capacitor 130 is disposed between the first ac input end 110 and the second ac input end 120, and a withstand voltage of the first capacitor 130 is greater than 500V.

In this embodiment, the rectifying unit 100 and the filtering unit 200 output a dc bus Vbus, the power converting unit 300 adjusts the output power of the LED driving circuit, and the load 400 may be, for example, a light-emitting LED. The withstand voltage of the first capacitor 130 (capacitor C1 in the figure) is greater than 500V, and when the first ac input terminal 110 and the second ac input terminal 120 are erroneously connected to a ballast (e.g., an electronic ballast), the first capacitor 130 absorbs high-frequency impact generated by the ballast, so as to prevent each unit and circuit device in the LED driving circuit from causing impact and prevent the LED driving circuit from being damaged.

Further, the first capacitor 130 is a capacitor having a withstand voltage of 630V or more. The first capacitor 130 may be a CBB capacitor (polypropylene capacitor), for example, a CBB21 capacitor may be selected. The rectifying unit 100 is a full-wave rectifier bridge BD1, and the first capacitor 130 is connected in parallel with a voltage-sensitive resistor RV1.

Referring to fig. 3, in one embodiment, the power conversion unit 300 includes a control chip U1 and its peripheral circuits, the control chip includes a chip input terminal and a chip output terminal CS (pin 3), the chip input terminal is coupled to the output terminal of the filtering unit 200, and the chip output terminal CS is coupled to the load 400. At least one pin of the four tubes of 5 pins, 6 pins, 7 pins and 8 pins is used as a chip input end, for example, 8 pins is used as the chip input end. The chip input is electrically connected to the output of the filtering unit 200 (dc bus Vbus). The control chip U1 internally comprises a switch tube for controlling the on-off of the chip input end and the chip output end CS, so that the conversion of the output power is realized.

The control chip comprises a signal grounding end GND (1 pin), a chip power supply end VCC (4 pin) and a zero current detection end ZCD (2 pin). The peripheral circuitry includes an output sub-circuit coupled to load 400, a power supply sub-circuit to power control chip U1, and a detection sub-circuit to perform zero current detection.

The output sub-circuit is coupled to the load 400 to supply power to the load 400, and includes a first inductor T1, a freewheeling diode D1, and a first resistor RS1, where a first end of the first inductor T1 is coupled to the chip output terminal CS, and a second end is coupled to the anode of the load 400; the anode of the freewheeling diode D1 is coupled to the cathode of the load 400, and the cathode is coupled to the signal ground GND; one end of the first resistor RS1 is coupled to the negative electrode of the freewheeling diode D1, and the other end is coupled to the chip output CS. The chip output end CS of the control chip U1 outputs power, and the first inductor T1, the freewheeling diode D1, the load and the resistor RS1 form a loop.

Further, the output sub-circuit includes a post-stage filter circuit, and the post-stage filter circuit includes a filter capacitor CE1 and a sixth resistor R6. Wherein, the filter capacitor CE1 is connected in parallel with the load 400; the sixth resistor R6 is connected in parallel with the load 400, and the post-stage filter circuit stabilizes the output power. The output sub-circuit further comprises a third capacitor C3, the third capacitor C3 being connected in parallel with the freewheeling diode.

The power supply circuit comprises a fourth capacitor C4, one end of the fourth capacitor C4 is coupled to the chip power supply terminal VCC, and the other end is coupled to the negative electrode of the freewheeling diode D1. It can be understood that, during the initial power-up, the control chip U1 is internally coupled to the chip power supply terminal VCC to supply power to the control chip U1,

the detection sub-circuit comprises a third resistor R3 and a fourth resistor R4. The first end of the third resistor R3 is coupled with the zero current detection end; one end of the fourth resistor R4 is coupled to the second end of the third resistor R3, and the other end is coupled to the anode of the load 400.

Referring to fig. 4, an LED lamp with a first contact 510, a second contact 520, and an LED driving circuit as mentioned in the above embodiments is further provided in an embodiment of the present application, wherein the first contact 510 is electrically connected to the first ac input terminal 110 of the driving circuit, and the second contact 520 is electrically connected to the second ac input terminal 120. In this embodiment, the LED driving circuit may be disposed inside the LED lamp or disposed outside the LED lamp. The first contact member 510 and the second contact member 520 may be selected from, for example, circuit posts, or pins fixed to the housing of the LED lamp.

All possible combinations of the technical features of the embodiments described above may not be described for the sake of brevity, but should be considered as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features. Features of different embodiments are shown in the same drawing, which is to be understood as also disclosing combinations of the various embodiments concerned.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application.

Claims

The LED driving circuit comprises a rectifying unit, a filtering unit, a power conversion unit and a load which are sequentially coupled, wherein the rectifying unit comprises a first alternating current input end and a second alternating current input end which are used for accessing commercial power, and the LED driving circuit is characterized in that a first capacitor is arranged between the first alternating current input end and the second alternating current input end, and the withstand voltage of the first capacitor is more than 500V;

the power conversion unit comprises a control chip and a peripheral circuit thereof, the control chip comprises a chip input end and a chip output end, the chip input end is coupled with the output end of the filtering unit, and the chip output end is coupled with the load;

the control chip includes a signal ground, the peripheral circuit includes an output sub-circuit, the output sub-circuit is coupled to the load, the output sub-circuit includes:

a first inductor, a first end of which is coupled to the output end of the chip, and a second end of which is coupled to the anode of the load;

the anode of the fly-wheel diode is coupled with the cathode of the load, and the cathode of the fly-wheel diode is coupled with the signal grounding terminal;

one end of the first resistor is coupled with the negative electrode of the freewheeling diode, and the other end of the first resistor is coupled with the output end of the chip;

the output sub-circuit comprises a third capacitor connected in parallel with the freewheeling diode.
2. The LED driving circuit according to claim 1, wherein a withstand voltage of the first capacitor is 630V or more.
3. The LED driving circuit according to claim 1, wherein the first capacitor is a polypropylene capacitor.
4. The LED driving circuit of claim 1, wherein the output sub-circuit comprises a post-filter circuit, the post-filter circuit comprising:

a filter capacitor connected in parallel with the load;

and the sixth resistor is connected with the load in parallel.
5. The LED driving circuit of claim 1, wherein the control chip comprises a chip power supply terminal, the peripheral circuit comprises a power supply electronic circuit, and the power supply electronic circuit comprises:

and one end of the fourth capacitor is coupled with the power supply end of the chip, and the other end of the fourth capacitor is coupled with the negative electrode of the freewheeling diode.
6. The LED driving circuit of claim 1, wherein the control chip comprises a zero current detection terminal, the peripheral circuit comprises a detection sub-circuit, and the detection sub-circuit comprises:

a first end of the third resistor is coupled with the zero current detection end;

and one end of the fourth resistor is coupled with the second end of the third resistor, and the other end of the fourth resistor is coupled with the anode of the load.
An LED light fixture, comprising: the LED driving circuit according to any one of claims 1 to 6, a first contact electrically connected to a first ac input terminal of the driving circuit, a second contact electrically connected to a second ac input terminal.