EP2801238A1 - Power supply circuit for control circuit of led lighting and led lighting - Google Patents

Power supply circuit for control circuit of led lighting and led lighting

Info

Publication number
EP2801238A1
EP2801238A1 EP12812571.3A EP12812571A EP2801238A1 EP 2801238 A1 EP2801238 A1 EP 2801238A1 EP 12812571 A EP12812571 A EP 12812571A EP 2801238 A1 EP2801238 A1 EP 2801238A1
Authority
EP
European Patent Office
Prior art keywords
coupled
light sources
led light
power supply
control circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP12812571.3A
Other languages
German (de)
French (fr)
Other versions
EP2801238B1 (en
Inventor
Yaping Liu
Middel TJACO
Xuewei Dai
Chunjun JIANG
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osram GmbH
Original Assignee
Osram GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Osram GmbH filed Critical Osram GmbH
Publication of EP2801238A1 publication Critical patent/EP2801238A1/en
Application granted granted Critical
Publication of EP2801238B1 publication Critical patent/EP2801238B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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

Definitions

  • the application relates to a power supply circuit, and particularly to a power supply circuit for reliably supplying power to control circuit of Light Emitting Diode (LED) light- ing.
  • the application further relates to an LED lighting including the power supply circuit.
  • LED Light Emitting Diode
  • control circuits on board are necessary for LED light sources capable of working safely in various situations.
  • the control circuit may trigger protecting activity in case of detecting overvoltage, overcurrent or overheat of driving power of the LED light sources, such as cutting off power supply to the LED light sources, thereby protecting effectively the LED light sources.
  • the power supply is a problem in such a case since when power supply is cut off, voltage of the control circuit per se drops, and then the protecting activity cannot be triggered any longer.
  • the present solution to the technical problem is to supply the voltage regulator from the output voltage of driver directly.
  • power input from a driver is directly connected to a voltage regulator 101 in addition to being supplied to LED light sources, the voltage regulator 101 generating suitable voltage and supplying the voltage to a control circuit 102, the control circuit 102 being connected to the gate of Metal Oxidation Semiconductor (MOS) transistor Ql for controlling it.
  • MOS Metal Oxidation Semiconductor
  • the control circuit 102 turns off Ql in case of detecting failure such as overcur- rent, so as to disconnect the current path of the LED light sources to protect the LED light sources.
  • This solution is low cost, but low efficiency for this voltage is too high.
  • Another solution is to employ an additional switch power supply to supply power to the control circuit. As shown in Fig.
  • an additional switch power supply 103 separately supplies power to a control circuit 104, such that the control circuit 104 can still be supplied with power unceasingly when pro- tecting activity is triggered.
  • This solution is complex and high cost, and that the duty cycle will be too small and efficiency will not be high.
  • the technical problem to be solved by the application is to provide a simple, efficient and low cost power supply circuit for reliably supplying power to control circuit of the LED lighting, so as to ensure unceasing operation of control circuit no matter protecting activity is triggered or not.
  • a power supply for control circuit of LED lighting comprising a plurality of LED light sources connected in series and a control switch for controlling on and off of current path of the LED light sources.
  • the power sup- ply circuit is characterized in that it comprises a first PNP transistor whose collector is coupled to a power input of the control circuit, emitter is coupled to a first node between a first group of LED light sources and a second group of LED light sources upstream the control switch, and a base is cou- pled to a second node between the control switch and the second group of LED light sources, such that when the control switch controls the current path to close, the first PNP transistor is on and when the control switch controls the current path to open, the first PNP transistor is off; a second NPN transistor whose base is coupled to the emitter of the first PNP transistor, emitter is coupled to the power input of the control circuit, and collector is coupled to power input of the plurality of LED light sources.
  • an LED lighting comprising the above power supply circuit is provided.
  • control circuit In LED lighting using the above power supply circuit, in normal working situation, the power of control circuit is sup- ported from middle tap of serial LEDs, and power supply may be utilized efficiently and energy is saved greatly.
  • power supply When protecting activities happen, even if the switch in serial with main circuit is off, the voltage supply will not be cut off since the current loop will be switched to another loop automatically, control circuit can work unceasingly, and control status will not change.
  • FIG. 1A and IB are schematic views showing known solutions for supplying power to a control circuit
  • Fig. 2 is a schematic view describing simply an LED lighting 200 of the application
  • Fig. 3 shows an embodiment of a power supply circuit for con- trol circuit of LED lighting of the application
  • Fig. 4 is another embodiment of a power supply circuit for control circuit of LED lighting of the application. Detailed Description of the Specific Embodiments
  • the embodiments of the invention relate to a power supply circuit. More specifically, the embodiments of the invention relate to a power supply circuit for reliably supply- ing power to control circuit of the LED lighting, thereby allowing ensuring unceasing working of the control circuit no matter the protecting activity is triggered or not. It shall be noted that the following descriptions are illustrative only and shall not be understood as limitation to the scope of the attached claims or the embodiments disclosed herein.
  • the LED lighting 200 comprises: a power input from a driver; N LED light sources Dl-Dn for lighting, N>1 ; a control circuit 202 for controlling and protecting safe operation of LED light sources; a power supply circuit 201 of the control circuit 202, which is coupled to a power input of LED light sources (via node 1) , to a node 2 (which is also called as "middle tap" of a plurality of LED light sources) located between first group of LED light sources D4-Dn and second group of LED light sources D3-D1 upstream the control switch, and to a node 4 located between the control switch and the second group of LED light sources D3-D1; a control switch for controlling on and off of current path of a plurality of LED light sources, which is indicated typically by MOS transistor Q here, its gate being coupled to the control circuit 202 (via node 5) and being controlled by the control circuit 202, source being connected to ground and drain being coupled to node 4.
  • MOS transistor Q MOS transistor
  • LED conducting current can be more than 700mA, forward voltage is about 3.5V, and it is stable. So we can get the power to be supplied to the control circuit from the middle tap of LEDs.
  • the "coupled to" used here is to define a direct connection between two circuit objects or among more circuit objects without any insertion circuit, and an indirect connection between two circuit objects or among more circuit objects implemented through one or more insertion circuits. For example, two circuit objects connected to each other directly is called as being “coupled to” each other. Also, provided two circuit objects are connected with one or more insertion circuits therebetween, they are also called as being “coupled to” .
  • control circuit 202 When the control circuit 202 does not detect abnormality of power input, power supply to control circuit 202 from positive electrode of the LED light sources is controlled by the control switch. On the contrary, when the control circuit 202 detects abnormality of power input, power supply to the control circuit 202 is switched by the control switch from middle tap of the LED light sources to power input of the plurality of LEDs .
  • control switch is described typically as MOS transistor above, a person skilled in the art shall appreciate easily from the above that the control switch may comprise other active switch (like NPN transistor) or passive switch capable of implementing similar function.
  • Fig. 3 shows an embodiment of the power supply circuit 202 in the LED lighting 200 in Fig. 2.
  • the control switch is still represented by MOS transistor Q3 , and has a connection manner similar to that in the preceding description.
  • the power supply circuit 201 comprises: a first PNP transistor Q2 whose collector is coupled to a power input of the control circuit 202, emitter is coupled to a node 2 between a first group of LED light sources D4-Dn and a second group of LED light sources D3-D1 upstream the control switch Q3 , and base is coupled to a node 4 between the control switch and the second group of LED light sources D3-D1; a second NPN transistor Q2 whose base is coupled to emitter of the first PNP transistor Q2 , emitter is coupled to power input of the control circuit 202, and collector is coupled to power input of the plurality of LED light sources Dl-Dn.
  • the power supply circuit 201 further comprises a resistor Rl coupled between collector of the second NPN transistor Ql and power input of the plurality of LED light sources Dl-Dn, a resistor R2 coupled between base of the second NPN transistor Ql and emitter of the first PNP transistor, and a resistor R3 coupled between base of the first PNP transistor Q2 and node 4, although it is not required the same in all embodiments.
  • Resistors Rl , R2 and R3 provide suitable working points for transistors Ql and Q2.
  • resistors are selected in such a manner that when the control circuit 201 does not detect abnormality, transistor Q2 is turned on stably and transistor Ql is turned off stably; and when the control circuit 201 detects abnormality, the transistor Q2 is stably turned off and the tran- sistor Ql is stably turned on, detailed introduction to this is provided as follows.
  • control circuit 202 sets base of control switch Q3 as high level to turn on Q3 , current flows through LED light sources Dl-Dn to make the LED light sources Dl-Dn to light, meanwhile, voltage difference between emitter and base of the first PNP transistor Q2 is sufficient to exceed PN junction voltage between the emitter and the base to turn on the Q2 , the turning on of the Q2 further allows power supply to the control circuit 202 from node 2 via emitter and collector of the first PNP transistor Q2.
  • control circuit 202 detects power input abnormality, the control circuit 202 sets base of control switch Q3 as low level to turn off Q3 , current cannot flow through LED light sources Dl-Dn to terminate lighting of the LED light sources Dl-Dn to protect the LED light sources Dl- Dn, meanwhile, voltage difference between emitter and base of the first PNP transistor Q2 is smaller than PN junction voltage between the emitter and the base to turn off the Q2 , the turning off of the Q2 further prohibits power supply to the control circuit 202 from node 2 via emitter and collector of the first PNP transistor Q2.
  • Fig. 4 shows another embodiment of power supply circuit 201 in LED lighting 200 shown in Fig. 2.
  • first PNP transistor Q2 , second NPN transistor Ql and resistors R2 and R3 in power supply circuit 301 correspond to first PNP transistor Q2 , second NPN transistor Ql and resistor R2 and R3 in the preceding embodiment, respectively, so repetitive de- scriptions are omitted here.
  • the power supply circuit 301 differs from the preceding embodiment in further comprising a resistor R4 coupled between node 2 and emitter of first PNP transistor Q2 , and a resistor R5 coupled between emitter of second NPN transistor Ql and power input of the control circuit 302.
  • Values of resistors R4 and R5 are selected in such a manner that when control circuit 302 does not detect abnormality and whereby Q2 is turned on, the resistor R4 provides suitable current feedback, when control circuit 302 detects abnormality and whereby Ql is turned on, R5 provides suitable current feedback. Due to prohibition function of feedback on the system parameter fluctuation, the whole system is influenced less by the voltage fluctuation especially by short circuit of a single LED.
  • node 2 between the first group of LED light sources and the second group of LED light sources may be set flexibly according to actual power requirement of the control circuit, for example, it may be located at positive electrode of D2.
  • the power supply circuit may also not be limited to the PNP transistor and NPN transistor described above, and may be implemented by any device such as MOS transistor capable of implementing the above processes.
  • MOS transistor Q3 may also be connected at other suitable position in current path of the plurality of LED light sources.
  • control circuit In such a manner, in normal working situation, the power of control circuit is supported from middle tap of serial LEDs, and power supply may be utilized effectively and energy is saved greatly.
  • control switch connected to the LED light sources in series turns off, no current flowing through LED light source, so LED light sources can be protected effectively; meanwhile, the voltage supply to the control circuit will not be cut off since the current loop will be switched automatically from middle tap of the LED light sources to power input of the LED light sources, control circuit can work unceasingly, and con- trol status will not change.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The application discloses a power supply circuit for control circuit of LED lighting, the LED lighting comprising a plurality of LED light sources connected in series and a control switch for controlling on and off of current path of the LED light sources. The power supply circuit is characterized in that it comprises a first PNP transistor whose collector is coupled to power input of the control circuit, emitter is coupled to a first node between a first group of LED light sources and a second group of LED light sources upstream the control switch, and base is coupled to a second node between the control switch and the second group of LED light sources, such that when the control switch controls the current path to close, the first PNP transistor is on and when the control switch controls the current path to open, the first PNP transistor is off; a second NPN transistor whose base is coupled to emitter of the first PNP transistor, emitter is coupled to the power input of the control circuit, and collector is coupled to power input of the plurality of LED light sources. The application further relates to LED lighting comprising the power supply circuit.

Description

Description
Power Supply Circuit for Control Circuit of LED Lighting and LED Lighting
Technical field of the Invention
The application relates to a power supply circuit, and particularly to a power supply circuit for reliably supplying power to control circuit of Light Emitting Diode (LED) light- ing. The application further relates to an LED lighting including the power supply circuit.
Background Art of the Invention
As the technology of LED light source advances, control cir- cuits on board are necessary for LED light sources capable of working safely in various situations. The control circuit may trigger protecting activity in case of detecting overvoltage, overcurrent or overheat of driving power of the LED light sources, such as cutting off power supply to the LED light sources, thereby protecting effectively the LED light sources. However, the power supply is a problem in such a case since when power supply is cut off, voltage of the control circuit per se drops, and then the protecting activity cannot be triggered any longer.
The present solution to the technical problem is to supply the voltage regulator from the output voltage of driver directly. As shown in Fig. 1A, power input from a driver is directly connected to a voltage regulator 101 in addition to being supplied to LED light sources, the voltage regulator 101 generating suitable voltage and supplying the voltage to a control circuit 102, the control circuit 102 being connected to the gate of Metal Oxidation Semiconductor (MOS) transistor Ql for controlling it. The control circuit 102 turns off Ql in case of detecting failure such as overcur- rent, so as to disconnect the current path of the LED light sources to protect the LED light sources. This solution is low cost, but low efficiency for this voltage is too high. Another solution is to employ an additional switch power supply to supply power to the control circuit. As shown in Fig. IB, an additional switch power supply 103 separately supplies power to a control circuit 104, such that the control circuit 104 can still be supplied with power unceasingly when pro- tecting activity is triggered. This solution is complex and high cost, and that the duty cycle will be too small and efficiency will not be high.
Summary of the Invention
The technical problem to be solved by the application is to provide a simple, efficient and low cost power supply circuit for reliably supplying power to control circuit of the LED lighting, so as to ensure unceasing operation of control circuit no matter protecting activity is triggered or not.
According to one aspect of the application, a power supply for control circuit of LED lighting is provided, the LED lighting comprising a plurality of LED light sources connected in series and a control switch for controlling on and off of current path of the LED light sources. The power sup- ply circuit is characterized in that it comprises a first PNP transistor whose collector is coupled to a power input of the control circuit, emitter is coupled to a first node between a first group of LED light sources and a second group of LED light sources upstream the control switch, and a base is cou- pled to a second node between the control switch and the second group of LED light sources, such that when the control switch controls the current path to close, the first PNP transistor is on and when the control switch controls the current path to open, the first PNP transistor is off; a second NPN transistor whose base is coupled to the emitter of the first PNP transistor, emitter is coupled to the power input of the control circuit, and collector is coupled to power input of the plurality of LED light sources.
According to another aspect of the invention, an LED lighting comprising the above power supply circuit is provided.
In LED lighting using the above power supply circuit, in normal working situation, the power of control circuit is sup- ported from middle tap of serial LEDs, and power supply may be utilized efficiently and energy is saved greatly. When protecting activities happen, even if the switch in serial with main circuit is off, the voltage supply will not be cut off since the current loop will be switched to another loop automatically, control circuit can work unceasingly, and control status will not change.
Brief Description of the Drawings
To further illustrate the above and other advantages and fea- tures of the invention, embodiments of the invention will be described hereinafter in detail in conjunction with the Drawings. It shall be understood that those drawings describe only typical embodiments of the invention, and thus cannot be regarded as a limitation to the invention. In the Drawings: Figs. 1A and IB are schematic views showing known solutions for supplying power to a control circuit;
Fig. 2 is a schematic view describing simply an LED lighting 200 of the application;
Fig. 3 shows an embodiment of a power supply circuit for con- trol circuit of LED lighting of the application;
Fig. 4 is another embodiment of a power supply circuit for control circuit of LED lighting of the application. Detailed Description of the Specific Embodiments
Generally, the embodiments of the invention relate to a power supply circuit. More specifically, the embodiments of the invention relate to a power supply circuit for reliably supply- ing power to control circuit of the LED lighting, thereby allowing ensuring unceasing working of the control circuit no matter the protecting activity is triggered or not. It shall be noted that the following descriptions are illustrative only and shall not be understood as limitation to the scope of the attached claims or the embodiments disclosed herein.
An LED lighting 200 according to the application is briefly described by referring to Fig. 2 first.
As can be seen from Fig. 2, the LED lighting 200 comprises: a power input from a driver; N LED light sources Dl-Dn for lighting, N>1 ; a control circuit 202 for controlling and protecting safe operation of LED light sources; a power supply circuit 201 of the control circuit 202, which is coupled to a power input of LED light sources (via node 1) , to a node 2 (which is also called as "middle tap" of a plurality of LED light sources) located between first group of LED light sources D4-Dn and second group of LED light sources D3-D1 upstream the control switch, and to a node 4 located between the control switch and the second group of LED light sources D3-D1; a control switch for controlling on and off of current path of a plurality of LED light sources, which is indicated typically by MOS transistor Q here, its gate being coupled to the control circuit 202 (via node 5) and being controlled by the control circuit 202, source being connected to ground and drain being coupled to node 4.
The application takes the following fact into account: LED conducting current can be more than 700mA, forward voltage is about 3.5V, and it is stable. So we can get the power to be supplied to the control circuit from the middle tap of LEDs. It should be noted that the "coupled to" used here is to define a direct connection between two circuit objects or among more circuit objects without any insertion circuit, and an indirect connection between two circuit objects or among more circuit objects implemented through one or more insertion circuits. For example, two circuit objects connected to each other directly is called as being "coupled to" each other. Also, provided two circuit objects are connected with one or more insertion circuits therebetween, they are also called as being "coupled to" .
When the control circuit 202 does not detect abnormality of power input, power supply to control circuit 202 from positive electrode of the LED light sources is controlled by the control switch. On the contrary, when the control circuit 202 detects abnormality of power input, power supply to the control circuit 202 is switched by the control switch from middle tap of the LED light sources to power input of the plurality of LEDs .
Although the control switch is described typically as MOS transistor above, a person skilled in the art shall appreciate easily from the above that the control switch may comprise other active switch (like NPN transistor) or passive switch capable of implementing similar function.
Fig. 3 shows an embodiment of the power supply circuit 202 in the LED lighting 200 in Fig. 2. In Fig. 3, the control switch is still represented by MOS transistor Q3 , and has a connection manner similar to that in the preceding description. The power supply circuit 201 comprises: a first PNP transistor Q2 whose collector is coupled to a power input of the control circuit 202, emitter is coupled to a node 2 between a first group of LED light sources D4-Dn and a second group of LED light sources D3-D1 upstream the control switch Q3 , and base is coupled to a node 4 between the control switch and the second group of LED light sources D3-D1; a second NPN transistor Q2 whose base is coupled to emitter of the first PNP transistor Q2 , emitter is coupled to power input of the control circuit 202, and collector is coupled to power input of the plurality of LED light sources Dl-Dn.
In one embodiment variant, the power supply circuit 201 further comprises a resistor Rl coupled between collector of the second NPN transistor Ql and power input of the plurality of LED light sources Dl-Dn, a resistor R2 coupled between base of the second NPN transistor Ql and emitter of the first PNP transistor, and a resistor R3 coupled between base of the first PNP transistor Q2 and node 4, although it is not required the same in all embodiments. Resistors Rl , R2 and R3 provide suitable working points for transistors Ql and Q2. Values of those resistors are selected in such a manner that when the control circuit 201 does not detect abnormality, transistor Q2 is turned on stably and transistor Ql is turned off stably; and when the control circuit 201 detects abnormality, the transistor Q2 is stably turned off and the tran- sistor Ql is stably turned on, detailed introduction to this is provided as follows.
When power input of LED light sources is normal, the control circuit 202 sets base of control switch Q3 as high level to turn on Q3 , current flows through LED light sources Dl-Dn to make the LED light sources Dl-Dn to light, meanwhile, voltage difference between emitter and base of the first PNP transistor Q2 is sufficient to exceed PN junction voltage between the emitter and the base to turn on the Q2 , the turning on of the Q2 further allows power supply to the control circuit 202 from node 2 via emitter and collector of the first PNP transistor Q2. At this time, since voltage difference between base and emitter of the second NPN emitter Ql is lower than PN junction voltage, Ql is turned off, current will not flow to control circuit 202 via Ql, thereby prohibiting power supply to control circuit 202 from power input of the LED light sources via emitter and collector of Ql, wherein there is no power consumption on Rl .
On the contrary, when control circuit 202 detects power input abnormality, the control circuit 202 sets base of control switch Q3 as low level to turn off Q3 , current cannot flow through LED light sources Dl-Dn to terminate lighting of the LED light sources Dl-Dn to protect the LED light sources Dl- Dn, meanwhile, voltage difference between emitter and base of the first PNP transistor Q2 is smaller than PN junction voltage between the emitter and the base to turn off the Q2 , the turning off of the Q2 further prohibits power supply to the control circuit 202 from node 2 via emitter and collector of the first PNP transistor Q2. At this time, since voltage difference between base and emitter of the second NPN emitter Ql exceeds PN junction voltage, Ql is turned on, current flow to control circuit 202 via Ql, thereby allowing power supply to control circuit 202 from power input of the LED light sources Dl-Dn via emitter and collector of Ql . By such way, when failure is detected, power supply to control circuit 202 is switched from node 2 to power input of the LED light sources Dl-Dn.
Fig. 4 shows another embodiment of power supply circuit 201 in LED lighting 200 shown in Fig. 2. In Fig. 4, first PNP transistor Q2 , second NPN transistor Ql and resistors R2 and R3 in power supply circuit 301 correspond to first PNP transistor Q2 , second NPN transistor Ql and resistor R2 and R3 in the preceding embodiment, respectively, so repetitive de- scriptions are omitted here. The power supply circuit 301 differs from the preceding embodiment in further comprising a resistor R4 coupled between node 2 and emitter of first PNP transistor Q2 , and a resistor R5 coupled between emitter of second NPN transistor Ql and power input of the control circuit 302.
Values of resistors R4 and R5 are selected in such a manner that when control circuit 302 does not detect abnormality and whereby Q2 is turned on, the resistor R4 provides suitable current feedback, when control circuit 302 detects abnormality and whereby Ql is turned on, R5 provides suitable current feedback. Due to prohibition function of feedback on the system parameter fluctuation, the whole system is influenced less by the voltage fluctuation especially by short circuit of a single LED.
The above paragraphs explain preferred embodiments of a power supply circuit reliably supplying power to the control circuit. The embodiments are not restrictive, and a person skilled in the art may make various changes and amendments after learning the above description. For example, node 2 between the first group of LED light sources and the second group of LED light sources may be set flexibly according to actual power requirement of the control circuit, for example, it may be located at positive electrode of D2. The power supply circuit may also not be limited to the PNP transistor and NPN transistor described above, and may be implemented by any device such as MOS transistor capable of implementing the above processes. MOS transistor Q3 may also be connected at other suitable position in current path of the plurality of LED light sources.
In such a manner, in normal working situation, the power of control circuit is supported from middle tap of serial LEDs, and power supply may be utilized effectively and energy is saved greatly. In addition, when protecting activities happen, control switch connected to the LED light sources in series turns off, no current flowing through LED light source, so LED light sources can be protected effectively; meanwhile, the voltage supply to the control circuit will not be cut off since the current loop will be switched automatically from middle tap of the LED light sources to power input of the LED light sources, control circuit can work unceasingly, and con- trol status will not change.
The invention has been described above by referring to specific embodiments. It shall be understood that the described embodiment is only illustrative instead of being restrictive. Therefore, the scope of the invention shall be defined by the appended claims rather than the above description. Various amendments and changes may be made without departing away from the scope of the application defined in the Claims.

Claims

Patent claims
1. A power supply circuit for control circuit of LED lighting, the LED lighting comprises: a plurality of LED light sources connected in series and a control switch for controlling on and off of current path of the plurality of LED light sources,
the power supply circuit being characterized in that it comprises :
a first PNP transistor whose collector is coupled to power input of the control circuit, emitter is coupled to a first node between a first group of LED light sources and a second group of LED light sources upstream the control switch, and base is coupled to a second node between the control switch and the second group of LED light sources, such that when the control switch controls the current path to close, the first PNP transistor is on and when the control switch controls the current path to open, the first PNP transistor is off;
a second NPN transistor whose base is coupled to the emitter of the first PNP transistor, emitter is coupled to the power input of the control circuit, and collector is coupled to power input of the plurality of LED light sources.
2. The power supply circuit according to claim 1, wherein the control switch comprises metal oxide semiconductor tran- sistor, whose gate is coupled to the control circuit, source is coupled to ground and drain is coupled to the second node.
3. The power supply circuit according to claim 1 or 2 , further comprising a first resistor coupled between the collector of the second NPN transistor and the power input of the plurality of LED light sources.
4. The power supply circuit according to claim 3, further comprising a second resistor coupled between the base of the second NPN transistor and the emitter of the first PNP transistor .
5. The power supply circuit according to claim 4, further comprising a third resistor coupled between the base of the first PNP transistor and the second node.
6. The power supply circuit according to claim 1 or 2 , further comprising a fourth resistor coupled between the first node and the emitter of the first PNP transistor.
7. The power supply circuit according to claim 6, further comprising a fifth resistor coupled between the emitter of the second NPN transistor and the power input of the control circuit .
8. A LED lighting, comprising the power supply circuit for control circuit of LED lighting according to any of claims
EP12812571.3A 2012-01-05 2012-12-17 Power supply circuit for control circuit of led lighting and led lighting Active EP2801238B1 (en)

Applications Claiming Priority (2)

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
PCT/EP2012/075750 WO2013102549A1 (en) 2012-01-05 2012-12-17 Power supply circuit for control circuit of led lighting and led lighting

Publications (2)

Publication Number Publication Date
EP2801238A1 true EP2801238A1 (en) 2014-11-12
EP2801238B1 EP2801238B1 (en) 2016-03-09

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WO (1) WO2013102549A1 (en)

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CN109451629B (en) * 2018-12-25 2024-10-18 深圳市越宏普照照明科技有限公司 Online lamp 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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WO2013102549A1 (en) 2013-07-11
CN103200726A (en) 2013-07-10
EP2801238B1 (en) 2016-03-09
CN103200726B (en) 2016-08-24

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