CN103200726A - Power supply circuit of control circuit of light-emitting diode (LED) lighting device and LED lighting device - Google Patents
Power supply circuit of control circuit of light-emitting diode (LED) lighting device and LED lighting device Download PDFInfo
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- CN103200726A CN103200726A CN201210001923XA CN201210001923A CN103200726A CN 103200726 A CN103200726 A CN 103200726A CN 201210001923X A CN201210001923X A CN 201210001923XA CN 201210001923 A CN201210001923 A CN 201210001923A CN 103200726 A CN103200726 A CN 103200726A
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- power supply
- led light
- control circuit
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/40—Details of LED load circuits
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
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Abstract
The invention discloses a power supply circuit used for a control circuit of a light-emitting diode (LED) lighting device. The LED lighting device comprises a plurality of LED light sources and a control switch, wherein the LED light sources are connected in series, and the control switch is used for controlling connection-disconnection of a current path of the LED light sources. The power supply circuit is characterized by comprising a first PNP transistor and a second NPN transistor, a collector end of the first PNP transistor is connected to a power source input end of a control circuit in a coupling mode, an emitter end of the first PNP transistor is connected to a first node between a first group of LED light sources and a second group of LED light sources at the upstream of the control switch in a coupling mode, a base electrode end of the first PNP transistor is connected to a second node between the control switch and the second group of the LED light sources in a coupling mode, so that when the control switch controls the current path to be connected, the first PNP transistor is conductive, and when the control switch controls the current path to be disconnected, the first PNP transistor is stopped; a base electrode end of the second NPN transistor is connected to the emitter end of the first PNP transistor in a coupling mode, an emitter end of the second NPN transistor is connected to the power source input end of the control circuit in a coupling mode, and a collector end of the second NPN transistor is connected to a power source input end of the plurality of LED light sources. The invention further relates to the LED lighting device comprising the power supply circuit.
Description
Technical field
The application relates to a kind of power supply circuits, relates in particular to the power supply circuits of reliably powering for to the control circuit of LED (light-emitting diode) lighting apparatus.The application also relates to the LED lighting apparatus that comprises these power supply circuits.
Background technology
Along with the led light source technological progress, the control circuit on working plate for can both the led light source of trouble free service in the various situations is essential.This control circuit can trigger protection action under the overvoltage of the driving power that detects led light source, overcurrent or overheated situation, such as the power supply of cutting off led light source, thereby protects led light source effectively.But the power supply to control circuit is a problem in this case, and this is that the voltage of control circuit self also descends because when cutting off the electricity supply, and causing no longer can the trigger protection action.
Solution to this problem is directly supplying pressurizer from the output voltage of driver at present.Shown in Figure 1A, import except supplying with led light source from the power supply of driver, also be directly connected to pressurizer 101, pressurizer 101 generates suitable voltage and with this voltage supply control circuit 102, control circuit 102 is connected to the grid of MOS (metal-oxide semiconductor (MOS)) transistor Q1 so that it is controlled.Control circuit 102 will turn-off Q1 under the situation that detects failure ratio such as overcurrent, thereby the current path of disconnection led light source is with the protection led light source.The advantage of this scheme is that cost is low, but that shortcoming is efficient is low, because input voltage is too high.
Another kind of solution is to use additional Switching Power Supply that control circuit is powered.As shown in Figure 1B, additional Switching Power Supply 103 is separately control circuit 104 power supplies, and control circuit 104 still can continue to be powered under the situation of trigger protection action like this.The shortcoming of this scheme is complexity and cost height, and duty ratio is too little, and efficient is not high.
Summary of the invention
The technical problem that the application will solve provides a kind of for the power supply circuits simply, efficiently and cheaply that the control circuit of LED lighting apparatus is reliably powered, so that no matter can both guarantee the control circuit non-stop run under the situation that triggers still not trigger protection action.
According to the application's a aspect, a kind of power supply circuits of the control circuit for the LED lighting apparatus are provided, this LED lighting apparatus comprises a plurality of led light sources that are connected in series and is used for the control switch of break-make of the current path of the described led light source of control.These power supply circuits are characterised in that and comprise: a PNP transistor, its collector terminal is couple to the power input of control circuit, the emitter-base bandgap grading end is couple to first group of led light source of control switch upstream and the first node between second group of led light source, and base terminal is couple to the Section Point between control switch and the second group of led light source, make a PNP transistor turns when control switch control current path is closed and when control switch is controlled the current path disconnection the one PNP transistor end; Second NPN transistor, its base terminal are couple to the transistorized emitter-base bandgap grading end of a PNP, and the emitter-base bandgap grading end is couple to the power input of control circuit, and collector terminal is couple to the power input of described a plurality of led light sources.
According to a further aspect in the invention, provide a kind of LED lighting apparatus that comprises above-mentioned power supply circuits.
In the LED lighting apparatus of using above-mentioned power supply circuits, in normal operating conditions, the power supply of control circuit is provided from the centre tap of series LED, can be the efficient power utilization, and is energy-conservation greatly.When protection action took place, even the switch of connect with main circuit turn-offs, voltage was supplied with and also can not cut off, and this is to automatically switch to another loop because of current loop, and control circuit can non-stop run, and state of a control is constant.
Description of drawings
In order further to illustrate above and other advantage of the present invention and feature, below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.Should be appreciated that these accompanying drawings only describe typical case of the present invention, and should not regard the restriction to scope of the present invention as.In the accompanying drawings:
Figure 1A and Figure 1B are the schematic diagrames that the known arrangement that control circuit is powered is shown;
Fig. 2 is the schematic diagram of briefly describing the application's LED lighting apparatus 200;
Fig. 3 is the embodiment of power supply circuits of control circuit that the application's LED lighting apparatus is shown;
Fig. 4 is another embodiment of power supply circuits of control circuit that the application's LED lighting apparatus is shown.
Embodiment
Generally speaking, embodiments of the invention relate to power supply circuits.More specifically; embodiments of the invention relate to the power supply circuits of reliably powering for to the control circuit of LED (light-emitting diode) lighting apparatus, thereby allow no matter can both guarantee the control circuit non-stop run under the situation that triggers still not trigger protection action.It should be noted that following description only shall not be applied to the scope of restriction claims or the embodiment disclosed herein as an illustration.
The application's LED lighting apparatus 200 is at first briefly described with reference to Fig. 2.
As shown in Figure 2, LED lighting apparatus 200 comprises: from the power supply input of driver; N the led light source D1-Dn that is used for illumination, N 〉=1; Control circuit 202 is for the trouble free service of led light source being controlled and being protected; The power supply circuits 201 of control circuit 202, (through node 1) is couple to the power input of led light source, node 2 (being also referred to as " centre tap " of a plurality of led light sources) between the first group of led light source D4-Dn that is couple in the control switch upstream and the second group of led light source D3-D1, and be couple to node 4 between control switch and the second group of led light source D3-D1; Control switch for the break-make of the current path of controlling a plurality of led light sources, is represented by metal-oxide-semiconductor Q typically that herein its grid (through node 5) is couple to control circuit 202, is controlled the control of circuit 202, and source ground and drain electrode are couple to node 4.
The application considers the following fact: the LED conduction current can be greater than 700mA, and forward voltage is about 3.5V, is stable.Therefore, can obtain to offer the power supply of control circuit from the centre tap of LED.
Should note, " coupling " used herein is restricted to the direct connection that is illustrated between two or more circuit objects without any inserting circuit object, and the indirect connection by one or more insertion circuit objects realizations between two or more circuit objects.For example, two circuit objects that are connected to each other directly are called as each other " coupling ".Two same circuit objects then are also referred to as each other " coupling " if be connected with one or more insertion circuit objects therebetween.
When control circuit 202 does not detect power supply input unusual, by control switch control from the positive pole of led light source to control circuit 202 power supplies.Otherwise control circuit 202 is detecting when unusual, the power supply of control circuit 202 is switched to the power input of described a plurality of led light sources by control switch from the centre tap of led light source.
Though control switch typically is described as MOS transistor in the above, those skilled in the art understand easily according to top description, and control switch also can comprise other active switchs (as NPN transistor) or the passive switch that can realize similar functions.
Fig. 3 illustrates an embodiment of the power supply circuits 201 in the LED lighting apparatus 200 of Fig. 2.In Fig. 3, control switch is represented by MOS transistor Q3 that still its connected mode is similar to the description of front.Power supply circuits 201 comprise: a PNP transistor Q2, its collector terminal is couple to the power input of control circuit 202, node 2 between first group of led light source D4-Dn that the emitter-base bandgap grading end is couple in control switch Q3 upstream and the second group of led light source D3-D1, and base terminal is couple to the node 4 between control switch and the second group of led light source D3-D1; The second NPN transistor Q1, its base terminal are couple to the emitter-base bandgap grading end of a PNP transistor Q2, and the emitter-base bandgap grading end is couple to the power input of control circuit 202, and collector terminal is couple to the power input of a plurality of led light source D1-Dn.
In an embodiment variant, power supply circuits 201 also comprise: be coupled in the resistor R1 between the power input of the collector terminal of the second NPN transistor Q1 and a plurality of led light source D1-Dn, be coupled in the base terminal of the 2nd NPN crystal Q1 and the resistor R2 between the transistorized emitter-base bandgap grading end of a PNP, and be coupled in the base stage of a PNP transistor Q2 and the resistor R3 between the node 4.In all embodiment, all do not require so although be not.Resistor R1, R2 and R3 provide suitable working point for transistor Q1 and Q2.The value of these resistors is selected as making: do not detect transistor Q2 conducting stably when unusual and transistor Q1 stably ends at control circuit 201; And control circuit 201 detect when unusual transistor Q2 stably by and transistor Q1 conducting stably describes in detail to this below.
Power supply at led light source is imported just often, the base stage of control circuit 202 control switch Q3 is set to high level and makes the Q3 conducting, electric current flows through led light source D1-Dn makes that led light source D1-Dn is luminous, the emitter of a PNP transistor Q2 and the voltage difference between the base stage are enough to surpass PN junction voltage between emitter and the base stage simultaneously, make that Q2 conducting, the conducting of Q2 further allow to power to control circuit 202 via the emitter and collector of a PNP transistor Q2 from node 2.At this moment, because base stage and the voltage difference between the emitter of the second NPN transistor Q1 are lower than PN junction voltage, cause Q1 to end, electric current can not flow to control circuit 202 via Q1, thereby forbid powering to control circuit 202 via the emitter and collector of Q1 from the power input of led light source, do not have power consumption on the R1.
Otherwise; detecting power supply at control circuit 202 imports when unusual; the base stage of control switch Q3 is set to low level makes Q3 end; electric current can not flow through led light source D1-Dn makes led light source D1-Dn termination luminous with protection led light source D1-Dn; the emitter of a PNP transistor Q2 and the voltage difference between the base stage are less than PN junction voltage between emitter and the base stage simultaneously; make Q2 end, ending of Q2 further forbidden powering to control circuit 202 via the emitter and collector of a PNP transistor Q2 from node 2.At this moment, because the base stage of the second NPN transistor Q1 and the voltage difference between the emitter surpass PN junction voltage, make the Q1 conducting, electric current flows to control circuit 202 via Q1, thereby allows from the power input of led light source D1-Dn via the emitter and collector of Q1 to control circuit 202 power supplies.By this way, when detecting fault, the power supply of control circuit 202 is switched to the power input of led light source D1-Dn from node 2.
Fig. 4 shows another embodiment of the power supply circuits 201 in the LED lighting apparatus 200 of Fig. 2.In Fig. 4, a PNP transistor Q2, the second NPN transistor Q1, resistor R2, R3 correspond respectively to a PNP transistor Q2, the second NPN transistor Q1, resistor R2, the R3 among the last embodiment in the power supply circuits 301, and it is repeated in this description the Therefore, omited.The difference of the embodiment of power supply circuits 301 and front is: also comprise the resistor R4 between the emitter-base bandgap grading end that is coupled in node 2 and a PNP transistor Q2, and be coupled in the resistor R5 between the power input of the emitter-base bandgap grading end of the second NPN transistor Q1 and control circuit 302.
The value of resistor R4 and R5 is selected as making: when control circuit 302 did not detect unusually also Q2 conducting thus, resistor R4 provided suitable current feedback.When control circuit 302 detected unusually also Q1 conducting thus, R5 provided suitable current feedback.Because feedback is to the inhibitory action of system parameters fluctuation, it is littler to cause whole system influenced by voltage fluctuation, and it is littler influenced by single led short circuit.
Aforementioned paragraphs has been explained the power supply circuits that control circuit is reliably powered as preferred embodiment.This embodiment is also unrestricted, and those skilled in the art can make a variety of changes and revise after the description on learn.For example, the node 2 between first group of led light source and the second group of led light source is to arrange flexibly according to the practical power demand of control circuit, such as the positive pole that can be positioned at D2.PNP transistor and NPN transistor in describing above power supply circuits also can be not limited to, but can be realized such as MOS transistor by any device of above-mentioned processing of can realizing.Metal-oxide-semiconductor Q3 also can be connected other appropriate location in the current path of a plurality of led light sources.
By this way, in normal operating conditions, the power supply of control circuit is provided from the centre tap of a plurality of LED of series connection, and it can be power utilization efficiently, has saved electric energy greatly.In addition, when the protection action took place, the control switch of connecting with led light source turn-offed, and does not have electric current to flow through in the led light source, can protect led light source effectively; Simultaneously, the power supply of control circuit is supplied with and also can not cut off, and this is because current loop switches to the power input of led light source automatically from the centre tap of led light source, so control circuit can non-stop run, and state of a control is constant.
With reference to specific embodiment the present invention has been described in the description in front.Be to be understood that described embodiment only is illustrative rather than determinate.Therefore, scope of the present invention is limited by the description of appended claim rather than front.Under the situation of the scope that does not depart from the application that claims limit, can carry out various modifications and change.
Claims (8)
1. power supply circuits that are used for the control circuit of LED lighting apparatus, described LED lighting apparatus comprise a plurality of led light sources that are connected in series and are used for the control switch of break-make of the current path of the described a plurality of led light sources of control,
Described power supply circuits are characterised in that and comprise:
The one PNP transistor, its collector terminal is couple to the power input of described control circuit, the emitter-base bandgap grading end is couple to first group of led light source of described control switch upstream and the first node between second group of led light source, and base terminal is couple to the Section Point between described control switch and the described second group of led light source, make when described control switch control described current path when closed a described PNP transistor turns and when described control switch is controlled described current path disconnection a described PNP transistor end;
Second NPN transistor, its base terminal are couple to the transistorized emitter-base bandgap grading end of a described PNP, and the emitter-base bandgap grading end is couple to the power input of described control circuit, and collector terminal is couple to the power input of described a plurality of led light sources.
2. power supply circuits according to claim 1, wherein, described control switch comprises metal oxide semiconductor transistor, and its gate terminal is couple to described control circuit, and source terminal is couple to ground and drain electrode end is couple to described Section Point.
3. power supply circuits according to claim 1 and 2 also comprise first resistor between the power input of the collector terminal that is coupled in described second NPN transistor and described a plurality of led light sources.
4. power supply circuits according to claim 3 also comprise the base terminal that is coupled in described second NPN transistor and second resistor between the transistorized emitter-base bandgap grading end of a described PNP.
5. power supply circuits according to claim 4 also comprise the 3rd resistor that is coupled between the transistorized base stage of a described PNP and the described Section Point.
6. power supply circuits according to claim 1 and 2 also comprise the 4th resistor that is coupled between described first node and the transistorized emitter-base bandgap grading end of a described PNP.
7. power supply circuits according to claim 6 also comprise the 5th resistor between the power input of the emitter-base bandgap grading end that is coupled in described second NPN transistor and described control circuit.
8. LED lighting apparatus, comprise as among the claim 1-7 each described for as described in the power supply circuits of control circuit of LED lighting apparatus.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210001923.XA CN103200726B (en) | 2012-01-05 | 2012-01-05 | The power supply circuits of the control circuit of LED illumination device and LED illumination device |
| EP12812571.3A EP2801238B1 (en) | 2012-01-05 | 2012-12-17 | Power supply circuit for control circuit of led lighting and led lighting |
| PCT/EP2012/075750 WO2013102549A1 (en) | 2012-01-05 | 2012-12-17 | Power supply circuit for control circuit of led lighting and led lighting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210001923.XA CN103200726B (en) | 2012-01-05 | 2012-01-05 | The power supply circuits of the control circuit of LED illumination device and LED illumination device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103200726A true CN103200726A (en) | 2013-07-10 |
| CN103200726B CN103200726B (en) | 2016-08-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210001923.XA Active CN103200726B (en) | 2012-01-05 | 2012-01-05 | The power supply circuits of the control circuit of LED illumination device and LED illumination device |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2801238B1 (en) |
| CN (1) | CN103200726B (en) |
| WO (1) | WO2013102549A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107345467A (en) * | 2017-06-26 | 2017-11-14 | 芯创（湖北）半导体科技有限公司 | A kind of illumination of emergency flight control, alarm circuit system |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109451629A (en) * | 2018-12-25 | 2019-03-08 | 深圳市越宏普照照明科技有限公司 | It can online lighting control system and lighting system |
| US11706853B2 (en) | 2021-10-06 | 2023-07-18 | Microsoft Technology Licensing, Llc | Monitoring an emission state of light sources |
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| CN2922364Y (en) * | 2005-08-08 | 2007-07-11 | 沈来沛 | Luminous diode lamp series |
| CN101247687A (en) * | 2007-02-15 | 2008-08-20 | 株式会社小糸制作所 | Light emitting device |
| US20090195163A1 (en) * | 2008-02-06 | 2009-08-06 | Microsemi Corporation | Single LED String Lighting |
| EP2200406A2 (en) * | 2008-12-18 | 2010-06-23 | Koito Manufacturing Co., Ltd. | Controller for vehicular lamp |
| JP2010278039A (en) * | 2009-05-26 | 2010-12-09 | Sanken Electric Co Ltd | Protection circuit for led illumination |
| CN101984732A (en) * | 2010-11-15 | 2011-03-09 | 深圳市大有庆科技有限公司 | Control method of light emitting diode (LED) constant current power supply and LED constant current power supply circuit |
| CN201976288U (en) * | 2010-12-22 | 2011-09-14 | 张心益 | Drive power supply for LED illuminating light |
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2012
- 2012-01-05 CN CN201210001923.XA patent/CN103200726B/en active Active
- 2012-12-17 EP EP12812571.3A patent/EP2801238B1/en active Active
- 2012-12-17 WO PCT/EP2012/075750 patent/WO2013102549A1/en active Application Filing
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2922364Y (en) * | 2005-08-08 | 2007-07-11 | 沈来沛 | Luminous diode lamp series |
| CN101247687A (en) * | 2007-02-15 | 2008-08-20 | 株式会社小糸制作所 | Light emitting device |
| US20090195163A1 (en) * | 2008-02-06 | 2009-08-06 | Microsemi Corporation | Single LED String Lighting |
| EP2200406A2 (en) * | 2008-12-18 | 2010-06-23 | Koito Manufacturing Co., Ltd. | Controller for vehicular lamp |
| JP2010278039A (en) * | 2009-05-26 | 2010-12-09 | Sanken Electric Co Ltd | Protection circuit for led illumination |
| CN101984732A (en) * | 2010-11-15 | 2011-03-09 | 深圳市大有庆科技有限公司 | Control method of light emitting diode (LED) constant current power supply and LED constant current power supply circuit |
| CN201976288U (en) * | 2010-12-22 | 2011-09-14 | 张心益 | Drive power supply for LED illuminating light |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107345467A (en) * | 2017-06-26 | 2017-11-14 | 芯创（湖北）半导体科技有限公司 | A kind of illumination of emergency flight control, alarm circuit system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103200726B (en) | 2016-08-24 |
| EP2801238B1 (en) | 2016-03-09 |
| WO2013102549A1 (en) | 2013-07-11 |
| EP2801238A1 (en) | 2014-11-12 |
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Effective date of registration: 20230406 Address after: Munich, Germany Patentee after: Optoelectronics Co.,Ltd. Address before: Munich, Germany Patentee before: OSRAM GmbH |
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