CN203301796U - Control circuit for LED AC (alternating current) drive - Google Patents
Control circuit for LED AC (alternating current) drive Download PDFInfo
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- CN203301796U CN203301796U CN2013200687081U CN201320068708U CN203301796U CN 203301796 U CN203301796 U CN 203301796U CN 2013200687081 U CN2013200687081 U CN 2013200687081U CN 201320068708 U CN201320068708 U CN 201320068708U CN 203301796 U CN203301796 U CN 203301796U
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Abstract
The utility model provides a control circuit for LED AC (alternating current) drive. The control circuit comprises an electricity-acquiring circuit, a drive control circuit, an isolation circuit and a filtering/energy storage circuit. The electricity-acquiring circuit comprises a first LED chipset. One electrode of the isolation circuit is connected with a positive electrode of the first LED chipset, and the other electrode of the isolation circuit is connected with a power supply terminal of the drive control circuit. The filtering/energy storage circuit is connected in parallel between the power supply terminal of the drive control circuit and a common potential reference point. A negative electrode of the first LED chipset is connected with the common potential reference point. The work power supply of the drive control circuit is provided by the forward voltage of the first LED chipset through the isolation circuit and the filtering/energy storage circuit. The electricity-acquiring circuit further comprises a second LED chipset. The isolation circuit is connected between the first LED chipset and the second LED chipset. The control circuit has few elements, and is simple, low in cost and high in reliability. The control circuit for the LED AC drive is high in efficiency and small in temperature rise of a lamp.
Description
Technical field
The utility model is that the LED in a kind of various LED lightings that are applicable to exchange type of drive work exchanges the control circuit that drives, and belongs to LED and exchanges the innovative technology of the control circuit that drives.
Background technology
LED light source has the advantages such as environmental protection, energy-conservation, long service life, be considered to 21 century one of the most promising lighting source, being particularly suitable for office, classroom, market, parking lot, waiting room, subway, tunnel, road etc. needs the public place of long-time illumination.
In the LED lighting, although adopt separate AC-DC Switching Power Supply constant current drive mode to solve the safety problem, the shortcoming of its existence is that drive current is large, and drive circuit is complicated, poor reliability, and cost is high, and efficiency is low, and volume is large; In addition, in Switching Power Supply use one to several electrochemical capacitors, so that the driving power life-span is much smaller than the life-span of LED chip in light fixture more.For this reason, the LED Driving technique of some no electrolytic capacitors, exchange Driving technique as LED and be subject to attention.
Existing LED exchanges in type of drive, its control circuit generally adopts the high voltage supply mode shown in accompanying drawing 1, accompanying drawing 2 or accompanying drawing 3, and wherein the structure shown in Fig. 1,2 is that the high direct voltage+VCC that obtains after rectification powers to Drive and Control Circuit through diode D2 voltage stabilizing, triode T expansion stream; Shown in Figure 3 is directly to Drive and Control Circuit, to power after resistance step-down and capacitor filtering.Adopt high pressure way to take power shown in accompanying drawing 1～2 to provide to the on-off controller of AC-DC Switching Power Supply constant-current drive circuit that to start power supply be rational, because after this controller starts, the auxiliary winding output voltage of switch transformer will be greater than the output voltage of voltage stabilizing didoe, force and expand stream triode T cut-off, the power consumption of power supply circuits is not high; And at LED, exchange in type of drive and adopt this class high pressure way to take power just very obvious to the shortcoming of control circuit power supply: efficiency is very low, load capacity is very poor, only can provide the source current of mA level to control circuit, otherwise current-limiting resistance R3, R4 and the upper power that consumes of expansion stream triode T will be too large, this has not only reduced the power-efficient of light fixture, has also aggravated the temperature rise of light fixture.For example, in Fig. 1, if output voltage is 12V, output current is 5mA, will consume the power of nearly 1.5W on current-limiting resistance and expansion stream triode, and in the LED Drive and Control Circuit, the source current of 5mA is sometimes also slightly inadequate.
Summary of the invention
The purpose of this utility model is to consider the problems referred to above and provides a kind of circuit simple, and element is few, and the LED that cost is low, reliability is high exchanges the control circuit that drives.The utility model efficiency is high, and the light fixture temperature rise is little.
The technical solution of the utility model is: LED of the present utility model exchanges the control circuit that drives, include power-supply circuit, Drive and Control Circuit, buffer circuit, filtering/accumulator, wherein power-supply circuit includes the first LED chip group, one utmost point of buffer circuit is connected with the positive pole of the first LED chip group, and another utmost point is connected with the power end of Drive and Control Circuit; Filtering/accumulator is connected in parallel between the power end and common potential reference point ground of Drive and Control Circuit, and the negative pole of the first LED chip group connects common potential reference point ground; The working power of Drive and Control Circuit is provided after buffer circuit and filtering/accumulator by the forward voltage of the first LED chip group.
Above-mentioned power-supply circuit also includes the second LED chip group, and buffer circuit is connected between the first LED chip group and the second LED chip group.
Above-mentioned buffer circuit is isolating diode D, and filtering/accumulator is capacitor C, and wherein the positive pole of isolating diode D is connected with the anode of the first LED chip group, and the negative pole of isolating diode D is connected with the power end of Drive and Control Circuit; Filtering/storage capacitor C is connected in parallel between the power end and common potential reference point ground of control circuit, the negative pole of the first LED chip group connects common potential reference point ground, and the working power of Drive and Control Circuit is provided after isolating diode D and filtering/storage capacitor C by the forward voltage of the first LED chip group.
Also be connected with constant-current source between above-mentioned the first LED chip group and the second LED chip group, the common potential reference point ground ground connection of the first LED chip group.
Or also be connected with constant-current source between above-mentioned the first LED chip group and earth terminal.
Above-mentioned the first LED chip group and the second LED chip group are the series LED chipset that is in series with some LED chips.
Above-mentioned the first LED chip group and/or the second LED chip group are also and connect or be serially connected with some LED chip groups.
The working power of above-mentioned Drive and Control Circuit the series connection several LED chip groups in any one group on power taking.
The utility model compared with prior art, has following advantage:
(1) the utility model circuit is simple, and element is few, and cost is low, reliability is high, and maximum output current is only relevant with the LED chip operating current.Practice shows, as long as the source current of Drive and Control Circuit is no more than 20% of LED chip operating current, the brightness of LED chip group changes little.
(2) circuit efficiency of the present utility model is high, and the light fixture temperature rise is little.
The utility model is that a kind of design is ingenious, function admirable, and convenient and practical LED exchanges the control circuit that drives.
Description of drawings
Fig. 1～3rd, existing LED exchanges the supply power mode schematic diagram that Drive and Control Circuit generally adopts;
Fig. 4 is the schematic diagram of the utility model embodiment 1;
Fig. 5 is the schematic diagram of the utility model embodiment 2;
Fig. 6 is the circuit diagram of the utility model embodiment 1;
Fig. 7 is the circuit diagram of the utility model embodiment 2;
Embodiment
Embodiment 1:
Structural representation of the present utility model as shown in Figure 4, LED of the present utility model exchanges the control circuit that drives, include power-supply circuit 1, Drive and Control Circuit 2, buffer circuit 3, filtering/accumulator 4, wherein power-supply circuit 1 includes the first LED chip group 5, one utmost point of buffer circuit 3 is connected with the positive pole of the first LED chip group 5, and another utmost point is connected with the power end VDD of Drive and Control Circuit 2; Filtering/accumulator 3 is connected in parallel between the power end VDD and common potential reference point ground COM of Drive and Control Circuit 2, and the negative pole of the first LED chip group 5 meets common potential reference point ground COM; The working power of Drive and Control Circuit 2 is provided after buffer circuit 3 and filtering/accumulator 4 by the forward voltage of the first LED chip group 5.
In addition, above-mentioned power-supply circuit 1 also includes the second LED chip group 6, and buffer circuit 3 is connected between the first LED chip group 5 and the second LED chip group 6.
In the present embodiment, above-mentioned buffer circuit 3 is isolating diode D, and filtering/accumulator 4 is capacitor C, and wherein the positive pole of isolating diode D is connected with the anode of the first LED chip group 5, and the negative pole of isolating diode D is connected with the power end of Drive and Control Circuit 2; Filtering/storage capacitor C is connected in parallel between the power end and common potential reference point ground COM of control circuit 2, the negative pole of the first LED chip group 5 meets common potential reference point ground COM, and the working power of Drive and Control Circuit 2 is provided after isolating diode D and filtering/storage capacitor C by the forward voltage of the first LED chip group 5.
Also be connected with the common potential reference point ground COM ground connection of constant-current source 7, the first LED chip groups 5 between above-mentioned the first LED chip group 5 and the second LED chip group 6.Or be connected with constant-current source 7 between the common potential reference point of above-mentioned the first LED chip group 5 ground COM and earth terminal.
Above-mentioned the first LED chip group 5 and the second LED chip group 6 are for being in series with the series LED chipset of some LED chips.
Some LED chip groups are gone back and connect or be serially connected with to above-mentioned the first LED chip group 5 and/or the second LED chip group 6.Or second LED chip group 6 and the first LED chip group 5 be other string and pattern.
The working power of above-mentioned Drive and Control Circuit 2 the series connection several LED chip groups in any one group on power taking.
In the present embodiment, the second LED chip group 6 includes LED chip Di1, Di2, Di3, the Di4 of some series connection ... Dik, the first LED chip group 5 includes LED chip D1, D2, D3, the D4 of some series connection ... Dn, buffer circuit 3 is isolating diode D, filtering/accumulator 4 is capacitor C, wherein the positive pole of isolating diode D connects the anode of series connection the first LED chip group 5, the negative pole of isolating diode D is connected with the power end vdd terminal of Drive and Control Circuit 2, and filtering/storage capacitor C is connected in parallel between the power end vdd terminal and common potential reference point ground of Drive and Control Circuit 2; The negative pole of the first LED chip group 5 is also linked common potential reference point ground, as shown in Figure 5.
The utility model operation principle: start moment, electric current through the second LED chip group 6 and constant-current source 7 charges to filtering/storage capacitor C through isolating diode D, when the capacitor C both end voltage reached the minimum operating voltage of Drive and Control Circuit 2, Drive and Control Circuit was started working; The voltage of capacitor C continues to rise, after surpassing the starting resistor of the first LED chip group 5, the first LED chip group 5 is luminous, tends towards stability after the forward voltage of the terminal voltage of capacitor C near the first LED chip group 5, and the first LED chip group 5 also enters normal luminance simultaneously.
The effect of isolating diode D is that pulsating voltage VCC after rectification is during near minimum value, stop filtering/storage capacitor C to the first LED chip group 5 discharges, can guarantee that Drive and Control Circuit 2 works in input voltage alternation process, also avoid damaging the first LED chip group 5 on the other hand on the one hand; In course of normal operation, although Drive and Control Circuit 2 source current I
DDMinute walked the operating current of a part of the first LED chip group 5, but for operating current the LED chip more than 60mA, if Drive and Control Circuit source current I
DDBelow 10mA, shunt so the impact of the first LED chip group 5 brightness limited, naked eyes are almost awared the difference of the brightness of the second LED chip group 6 and the first LED chip group 5, special for operating current the LED chip more than 150mA, the electric current I of Drive and Control Circuit 2
DDAlmost can ignore on the electric current of the first LED chip group 5 and the impact of brightness.
The LED chip quantity n that the first LED chip group 5 comprises is relevant with the size of the supply voltage VDD that Drive and Control Circuit 2 requires.
Filtering/storage capacitor C requirement of withstand voltage is not high, can use low pressure high power capacity ceramic paster electric capacity.
Embodiment 2:
Fig. 7 is the schematic diagram that 30W no electrolytic capacitor LED exchanges the Drive and Control Circuit of type of drive light fixture, in the present embodiment, the second LED chip group 6 includes some LED chip Di1, Di2, Di3, Di4 ... Dik, the first LED chip group 5 includes the LED chip D1 of 3 series connection, D2, D3, buffer circuit 3 is isolating diode D, the operating circuit of the first LED chip group 5 is 150mA, isolating diode D is the Schottky diode of low conducting voltage, its positive pole connects the positive pole of the first LED chip group 5, negative pole meets the power end VDD of Drive and Control Circuit 2, filtering/accumulator 4 is 22 μ F by 3 capacity, withstand voltage is the ceramic paster capacitor C 1 of 16V, C2, C3 forms, filtering/storage capacitor C is connected in parallel between the power end VDD and common potential reference point ground of Drive and Control Circuit 2, the negative pole of the first LED chip group 5 is also linked common potential reference point ground, as shown in Figure 7.
Actual measurement shows that these power supply circuits can be Drive and Control Circuit the electric current of 20mA is provided.
Above-described is only one of the utility model execution mode, and the utility model is not limited to above embodiment.Relevant speciality technical staff is not breaking away from other improvement and the variation of deducing out under the utility model spirit and design prerequisite, within all should being included in the protection range of utility model.
Claims (8)
1. a LED exchanges the control circuit that drives, it is characterized in that including power-supply circuit (1), Drive and Control Circuit (2), buffer circuit (3), filtering/accumulator (4), wherein power-supply circuit (1) includes the first LED chip group (5), one utmost point of buffer circuit (3) is connected with the positive pole of the first LED chip group (5), and another utmost point is connected with the power end (VDD) of Drive and Control Circuit (2); Filtering/accumulator (3) is connected in parallel between the power end (VDD) and common potential reference point ground (COM) of Drive and Control Circuit (2), and the negative pole of the first LED chip group (5) connects common potential reference point ground (COM); The working power of Drive and Control Circuit (2) is provided after buffer circuit (3) and filtering/accumulator (4) by the forward voltage of the first LED chip group (5).
2. LED according to claim 1 exchanges the control circuit that drives, it is characterized in that above-mentioned power-supply circuit (1) also includes the second LED chip group (6), buffer circuit (3) is connected between the first LED chip group (5) and the second LED chip group (6).
3. LED according to claim 2 exchanges the control circuit that drives, it is characterized in that above-mentioned buffer circuit (3) is isolating diode D, filtering/accumulator (4) is capacitor C, wherein the positive pole of isolating diode D is connected with the anode of the first LED chip group (5), and the negative pole of isolating diode D is connected with the power end (VDD) of Drive and Control Circuit (2); Filtering/storage capacitor C is connected in parallel between the power end and common potential reference point ground (COM) of Drive and Control Circuit (2), the negative pole of the first LED chip group (5) connects common potential reference point ground (COM), and the working power of Drive and Control Circuit (2) is provided after isolating diode D and filtering/storage capacitor C by the forward voltage of the first LED chip group (5).
4. LED according to claim 3 exchanges the control circuit that drives, it is characterized in that also being connected with constant-current source (7) between above-mentioned the first LED chip group (5) and the second LED chip group (6) common potential reference point ground (COM) ground connection of the first LED chip group (5).
5. LED according to claim 3 exchanges the control circuit that drives, and it is characterized in that also being connected with constant-current source (7) between above-mentioned the first LED chip group (5) and earth terminal.
6. LED according to claim 3 exchanges the control circuit that drives, and it is characterized in that above-mentioned the first LED chip group (5) and the second LED chip group (6) are for being in series with the series LED chipset of some LED chips.
7. LED according to claim 6 exchanges the control circuit that drives, and it is characterized in that above-mentioned the first LED chip group (5) and/or the second LED chip group (6) go back and connect or be serially connected with some LED chip groups.
8. the described LED of according to claim 1 to 7 any one exchanges the control circuit that drives, power taking in several LED chip groups of series connection any one group of the working power that it is characterized in that above-mentioned Drive and Control Circuit (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200687081U CN203301796U (en) | 2013-02-05 | 2013-02-05 | Control circuit for LED AC (alternating current) drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200687081U CN203301796U (en) | 2013-02-05 | 2013-02-05 | Control circuit for LED AC (alternating current) drive |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203301796U true CN203301796U (en) | 2013-11-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013200687081U Expired - Lifetime CN203301796U (en) | 2013-02-05 | 2013-02-05 | Control circuit for LED AC (alternating current) drive |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203301796U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103338546A (en) * | 2013-02-05 | 2013-10-02 | 元烽 | LED alternating current drive control circuit |
| CN104600967A (en) * | 2015-01-07 | 2015-05-06 | 北京天诚同创电气有限公司 | high-voltage direct-current power supply circuit |
| CN113391572A (en) * | 2020-03-12 | 2021-09-14 | 浙江苏泊尔家电制造有限公司 | Control method and control circuit for cooking appliance and cooking appliance |
-
2013
- 2013-02-05 CN CN2013200687081U patent/CN203301796U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103338546A (en) * | 2013-02-05 | 2013-10-02 | 元烽 | LED alternating current drive control circuit |
| CN103338546B (en) * | 2013-02-05 | 2016-08-10 | 元烽 | The control circuit that a kind of LED alternating-current drives |
| CN104600967A (en) * | 2015-01-07 | 2015-05-06 | 北京天诚同创电气有限公司 | high-voltage direct-current power supply circuit |
| CN104600967B (en) * | 2015-01-07 | 2017-12-29 | 北京天诚同创电气有限公司 | High-voltage direct-current power supply circuit |
| CN113391572A (en) * | 2020-03-12 | 2021-09-14 | 浙江苏泊尔家电制造有限公司 | Control method and control circuit for cooking appliance and cooking appliance |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131120 Termination date: 20150205 |
|
| EXPY | Termination of patent right or utility model | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20131120 Effective date of abandoning: 20160810 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |