GB2498695A - LED driving power supply - Google Patents

LED driving power supply Download PDF

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Publication number
GB2498695A
GB2498695A GB1309644.1A GB201309644A GB2498695A GB 2498695 A GB2498695 A GB 2498695A GB 201309644 A GB201309644 A GB 201309644A GB 2498695 A GB2498695 A GB 2498695A
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GB
United Kingdom
Prior art keywords
resistor
capacitor
control chip
pin
voltage
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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
GB1309644.1A
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GB201309644D0 (en
GB2498695B (en
Inventor
Heming Huang
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.)
SHENZHEN COLLESUN LIGHTING CO Ltd
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SHENZHEN COLLESUN LIGHTING CO Ltd
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Publication of GB201309644D0 publication Critical patent/GB201309644D0/en
Publication of GB2498695A publication Critical patent/GB2498695A/en
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Publication of GB2498695B publication Critical patent/GB2498695B/en
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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]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/382—Switched mode power supply [SMPS] with galvanic isolation between input and output
    • 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]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Led Devices (AREA)
  • Dc-Dc Converters (AREA)

Abstract

An LED driving power supply comprises a comparator (U6), an optocoupler portion, a transformer (T1) having a primary main winding (T1-A), a secondary main winding (T1-D), a primary auxiliary winding (T1-B), and a secondary auxiliary winding (T1-C), and a control chip (U1) connected with the primary main winding (T1-A) and the primary auxiliary winding (T1-B). The secondary main winding (T1-D) is connected with a current detection end (-IS) of an LED load through a detection resistance (R13), which converts a current variation of the LED load detected by the current detection end (-IS) into a voltage variation. The voltage variation is compared with a reference voltage through the comparator (U6), the output of which is fed back to a feedback loop function control pin of the control chip (U1) through the optocoupler portion. The voltage of the feedback loop function control pin is compared with a voltage of an inner crystal oscillator of the control chip (U1), thus the duty cycle width of the grid voltage of an inner field-effect transistor of the control chip (U1) is adjusted to perform an average current control.

Description

LED DRIVING POWER SUPPLY
FILED OF THE INVENTION
The present invention relates to LED driving power supplies.
BACKGROUND OF THE INVENTION
LEDs (light emitting diode) have advantages of low power consumption. thng lifespan, low cost etc.. which have been widely used in display and lighting products, such as LED illumination lights, LED displays, and LED decorative lights.
In general, a normal LED dnving power supply is obtained by rectifying and filtering the AC power supply, using PWM (pulse width modulation) with voltage sampling feedback or current sampling feedback to get a stable output of voltage or current. While normal LED driving power supplies use valley filling of diodes and electrolytic capacitors to achieve the power factor correction, the working life of the LED driving power supplies are decreased by using the electrolytic capacitors.
SUMMARY OF THE INVENTION
The purpose of the present invention is to provide an LED driving power supply having long In one aspect of the present invention, an LED driving power supply includes a comparator, an optocoupler portion, a transformer having a primary main winding, a secondary main winding, a primary auxiliary winding and a secondary auxiliary winding. and a control chip connected with the primary main winding and the primary auxiliary winding. The second main winding is connected with a current detection end of an LED load through a detection resistance, which converts a current variation of the LED load detected by the current detection end into a voltage variation. The voltage variation is compared with a base voltage through the comparator. the output of which is fed back to a feedback ioop function control pin of the control chip through the optocoupler portion. The voltage of the feedback loop function control pin is compared with a voltage of an inner crystal oscillator of the control chip, thus the duty cycle width of the grid voltage of an inner field-effect transistor of the control chip is adjusted to perform an average current control.
The LED driving power supply of the present invention obtains an average current control through feedback loop controlling duty cycle other than using electrolytic capacitors, which has a long working life and a great power factor
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a circuit diagram of an LED dnving power supply of the present invention; FIG. 2 is another circuit diagram of the LED driving power supply of the present invention; FIG. 3 is another circuit diagram of the LED driving power supply of the present invention; FIG. 4 is another circuit diagram of the LED driving power supply of the present invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENT
Reference will now be made in detail to the present embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or 111cc parts.
Please refer to FIG. 1 to FIG. 4, an LED driving power supply of the present invention includes a comparator U6, an optocoupler portion including an optocoupler OT1-A and an optocoupler OTI-B. a transformer TI including a primary main winding TI-A. a secondary main winding Tl-D, a primary auxiliary winding Tl-B and a secondary auxiliary winding TI-C, and a control chip UI.
As shown in FIG. I. the LED driving power supply further includes an electromagnetic disturbance preventing portion, which includes an AC (aflernating current) input having one end connecting an end of a fuse Fl, and the other end of the fuse Fl connecting to one end of a resistor Ri and a capacitor Cl and a node between the fuse El and the resistor Ri connecting to a winding of a common mode choke Li, while the other end of the AC input connecting the other end of the capacitor Cl. The other end of the capacitor Ci is connected to the other winding of the common mode choke LI. The common mode choice is connected to an input end of a rectifier bridge BRGI, and an output end of the rectifier bridge BRGI is connected to one end of a resistor ROl. The other end of the resistor ROl is connected to an inductance L2, and the other end of the inductance L2 is connected to a capacitor C2. The output end of the rectifier bridge BRG1 is connected to the other end of the capacitor C2.
As shown in FIG. 2, the control chip Ui has an eighth pin internally integrated with a drain electrode of a field-effect transistor, and a first pin internally integrated with a source electrode of the field-effect transistor, a fourth pin interna'ly integrated a gate electrode of the field-effect transistor. The control chip Ui has the first pin connected to one end of a resistor R12, a sixth pin connected to the primary auxiliary winding TI-B, and the other end of the resistor r12 is grounded. The first pin and the eighth pin of the control chip UI are connected to a capacitor CS in parallel. The primary main winding Ti-A and the capacitor C5 are connected in series to form a resonant network. A node between the capacitor C5 and the first pin of control chip UI is connected to one end of a capacitor C6, and the other end of the capacitor C6 is connected to a third pin of the control chip UI, which is served as an OCP(over culTent protection) function end.
The LED driving power supply further includes a quasi-resonant preventing circuit, in which one end of the primary auxiliary winding TI-B connecting a resistor R7. and the other end of the primary auxiliary winding Ti-B connecting to a resistor Ri2. The other end of the resistor R7 is connected to a rectifier tube D3. A common node of the resistor R7 and the rectifier tube D3 is connected to a positive electrode of a diode D4, and a negative electrode of the diode D4 is connected to one end of a resistor R9. The other end of the resistor R9 is connected to one end of a capacitor C7 and a positive electrode of a diode D5. The other end of the capacitor C7 is connected to the resistor R12.
As shown in FIG. 3, the secondary main winding Tl-D has one end connected to a positive electrode of a diode D2, and the other end connected to a detecting resistor R13 and a negative electrode of a diode D57. The negative end of the diode D2 is connected to a positive electrode of a capacitor Cli and one end of a capacitor Cl 2 and a voltage-regulator tube Z3. A positive electrode of the diode D57 and the other end of the detecting resistor R13 are connected to a current detecting end IS of an LED load. The detecting resistor R13 has a voltage drop restrained within a safe range by the diode D57 to protect the resistor R13 not to be damaged.
As shown in FIG. 4, a reference voltage REF is applied to a resistor R25, a resistor R26 and a capacitor Cl 7 through a resistor R23 and a resistor R24 as a base voltage.
In FIG. 2, the optocoupler OTI-A, the resistor Rh and the resistor RI2 are connected in series between the fourth pin of the control chip U I and ground. In FIG. 4, the optocoupler OT1-B and a resistor R30 connected in parallel are serially connected with a resistor R29 between a 5V voltage and an output of the comparator U6.
The detecting resistor R13 converts a current variation of the LED load detected by the current detecting end IS into a voltage variation. The voltage variation is compared to the base voltage through the comparator U6. The comparator U6 outputs a feedback result to the fourth pin (feedback loop function control pin) of the control chip UI through the optocouplers OTI-A and UT I-B. The voltage of the feedback oop function control pin is compared with a voltage of an inner crystal oscillator to adjust a duty cycle width of UN state of the gate electrode of an inner field-effect transistor of the control chip UI to perform average current control.
When the culTent of the LED load is decreased, the voltage of the current detecting end IS is decreased. The voltage of the end of the comparator U6 connecting the current detecting end IS is decreased relative to the base voltage, in this case, the current flowing to the optocoupler OT1-B is decreased and the current flowing to the optocoupler OT1-B is decreased. Therefore the current fed back to the control chip UI through the optocouplers OTI-A and OTI-B is decreased. The contr& chip UI has the duty cycle of the gate electrode of the inner field-effect transistor is narrowed and a peak value of the current is decreased, therefore forming a corresponding peak value of current of the gate electrode (the peak value of current of the gate electrode is proportioned to a voltage input) to perform an average current control.
When the current of the LED load is increased, the voltage of the current detecting end IS is increased relative to the base voltage of the comparator U6. In this case, the current flowing to the optocoupler OTI-B is increased. The current fed back to the control chip UI through the optocouplers OT1-A and OT1-B is increased. The on-state duty cycle width of the gate electrode of the inner field-effect transistor is greater. The peak value of current is increased, therefore forming a correspoiiding peak value of current of the gate electrode (the peak value of culTent of the gate electrode is proportioned to a voltage input) to peifoim an average current control.
Although the present invention has been described in considerable detail with reference to certain embodiments thereof, other embodiments are possible. Therefore, the spirit and scope of the appended claims should not be limited to the description of the embodiments contained herein.

Claims (1)

  1. <claim-text>CLAIMSI. An LED driving power supply, comprising: a comparator; an optocoupler portion; a transformer having a primary main winding, a secondary main winding, a primary auxiliary winding and a secondary auxiliary winding; and a control chip connected with the primary main winding and the primary auxiliary winding, wherein in use, the second main winding is connected with a current detection end of an LED load through a detection resistor, the detection resister converts a current variation of the LED load detected by the current detection end into a voltage variation which is compared with a base voltage by the comparator, an output of the comparator is fed back to a feedback loop function control pin of the control chip through the optocoupler portion, and a voltage on the feedback loop function control pin is compared with a voltage of an inner crystal oscillator of the control chip, thereby a duty cycle width of a grid voltage of an inner field-effect transistor of the control chip is adjusted to perform an average current control.</claim-text> <claim-text>2. The LED driving power supply according to claim I. wherein the optocoupler portion comprises a first optocoupler and a second optocoupler, the first optocoupler, a first resistor and a second resistor being connected in senes between a fourth pin of the control chip and ground, wherein the second optocoupler and a third resistor connected in parallel are serially connected to a fourth resistor between a 5V voltage and the output of the comparator.</claim-text> <claim-text>3. The LED driving power supply according to daim I, wherein the base voltage results from a reference voltage applied to a fifth resistoi; a sixth resistor and a first capacitor via a seventh resistor and a eighth resistor 4. The LED driving power supply according to claim 1, further comprising an electromagnetic disturbance preventing portion, wherein: an AC input having one end is connected to an end of a fuse.the other end of the fuse is connected to one end of a ninth resistor and a second capacitor, a node between the fuse and the ninth resistor is connected to a winding of a common mode choke, the other end of the AC input is connected the other end of the second capacitor which is connected to the other winding of the common mode choke, the common mode choice is connected to an input end of a rectifier bridge, an output end of the rectifier bridge is connected to one end of a tenth resistor, the other end of the tenth resistor is connected to one end of an inductance, the other end of the inductance is connected to a third capacitor, and the output end of the rectifier bridge is connected to the other end of the third capacitor.5. The LED driving power supply according to claim 1, wherein the control chip comprises: an eighth pin internally integrated with a drain electrode of a field-effect transistor; a first pin internally integrated with a source electrode of the field-effect transistor; and a fourth pin internally integrated with a gate electrode of the field-effect transistor, wherein the first pin of the control chip is connected to one end of a second resistor, a sixth pin of the control chip is connected to the primary auxiliary winding, the other end of the second resistor is grounded, the first pin and the eighth pin of the control chip are connected to a fourth capacitor in parallel, the primary main winding and the fourth capacitor are connected in series to form a resonant network, a node between the fourth capacitor and the first pin of control chip are connected to one end of a fifth capacitor, and the other end of the fifth capacitor is connected to an OCP function end of a third pin of the control chip.6. The LED driving power supply according to daim 1, wherein the LED driving power supply further comprises a quasi-resonant preventing circuit, in which one end of the primary auxiliary winding is connected to an eleventh resistor, and the other end of the primary auxiliary winding is connected to a second resistor, the other end of the eleventh resistor is connected to a rectifier tube, wherein an conmion node of the eleventh resistor and the rectifier tube is connected to a positive electrode of a first diode, and a negative electrode of the first diode is connected to one end of a twelfth resistor, the other end of the twelfth resistor is connected to one end of a sixth capacitor and an positive electrode of a second diode, and the other end of the sixth capacitor is connected to the second resistor. l07. The LED driving power supply according to claim i, wherein the secondary main winding has one end connected to a positive electrode of a third diode, and the other end connected to a detecting resistor and a negative electrode of a fourth diode, wherein the negative end of the third diode is connected to a positive electrode of a seventh capacitor and one end of an eighth capacitor and a voltage-regulator tube, wherein a positive electrode of the fourth diode and the other end of the detecting resistor are connected to a current detecting end of an LED load.</claim-text>
GB1309644.1A 2010-11-26 2010-12-31 LED driving power supply Expired - Fee Related GB2498695B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2010105624573A CN102111936B (en) 2010-11-26 2010-11-26 Light emitting diode (LED) driving power supply
PCT/CN2010/080591 WO2012068765A1 (en) 2010-11-26 2010-12-31 Led driving power supply

Publications (3)

Publication Number Publication Date
GB201309644D0 GB201309644D0 (en) 2013-07-17
GB2498695A true GB2498695A (en) 2013-07-24
GB2498695B GB2498695B (en) 2016-09-21

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GB1309644.1A Expired - Fee Related GB2498695B (en) 2010-11-26 2010-12-31 LED driving power supply

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JP (1) JP2014501023A (en)
CN (1) CN102111936B (en)
GB (1) GB2498695B (en)
WO (1) WO2012068765A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102883499A (en) * 2011-08-02 2013-01-16 深圳桑达国际电子器件有限公司 LED (light-emitting diode) silicon-controlled power supply and constant current control circuit
CN105472806B (en) * 2015-11-16 2017-04-05 江苏力行电力电子科技有限公司 Suitable for exchanging the LED drive power of dimmer from drainage method and circuit module
CN108112149B (en) * 2017-12-26 2023-07-07 生迪智慧科技有限公司 Power supply control device and lamp

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7307390B2 (en) * 2005-06-16 2007-12-11 Active-Semi International, Inc. Primary side constant output voltage controller
CN101227778A (en) * 2008-02-19 2008-07-23 东南大学 Self-excited oscillation type high power LED constant-current driving circuit
CN201414244Y (en) * 2009-06-10 2010-02-24 福建蓝蓝高科技发展有限公司 Driving circuit for high-power LED street lamps
CN201499348U (en) * 2009-08-18 2010-06-02 重庆师范大学 LED illumination driving circuit with wide load and high efficiency
KR100966147B1 (en) * 2009-12-07 2010-06-25 이시영 Current limitation switching mode power supply for light emitting element
CN101801136A (en) * 2010-03-17 2010-08-11 上海大学 High-efficiency LED constant current driving circuit
US20100295470A1 (en) * 2009-05-19 2010-11-25 Stmicroelectronics Design And Applications S.R.O. Control device for a flyback converter

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5619402A (en) * 1996-04-16 1997-04-08 O2 Micro, Inc. Higher-efficiency cold-cathode fluorescent lamp power supply
CN2543317Y (en) * 2002-04-19 2003-04-02 李洲科技股份有限公司 Drive circuit for LED lamps and lanterns
JP4370901B2 (en) * 2003-10-15 2009-11-25 パナソニック電工株式会社 LED lighting device
CN201069088Y (en) * 2007-08-06 2008-06-04 巴力士照明有限公司 Emergency illuminator
JP5006840B2 (en) * 2008-05-29 2012-08-22 三菱電機株式会社 Light emitting device and lighting device
JP5342270B2 (en) * 2009-02-23 2013-11-13 パナソニック株式会社 LED dimming / lighting device and LED lighting apparatus using the same
CN101539251B (en) * 2009-04-24 2011-01-19 周华 LED illuminating system with high power factor

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7307390B2 (en) * 2005-06-16 2007-12-11 Active-Semi International, Inc. Primary side constant output voltage controller
CN101227778A (en) * 2008-02-19 2008-07-23 东南大学 Self-excited oscillation type high power LED constant-current driving circuit
US20100295470A1 (en) * 2009-05-19 2010-11-25 Stmicroelectronics Design And Applications S.R.O. Control device for a flyback converter
CN201414244Y (en) * 2009-06-10 2010-02-24 福建蓝蓝高科技发展有限公司 Driving circuit for high-power LED street lamps
CN201499348U (en) * 2009-08-18 2010-06-02 重庆师范大学 LED illumination driving circuit with wide load and high efficiency
KR100966147B1 (en) * 2009-12-07 2010-06-25 이시영 Current limitation switching mode power supply for light emitting element
CN101801136A (en) * 2010-03-17 2010-08-11 上海大学 High-efficiency LED constant current driving circuit

Also Published As

Publication number Publication date
GB201309644D0 (en) 2013-07-17
WO2012068765A1 (en) 2012-05-31
GB2498695B (en) 2016-09-21
CN102111936B (en) 2013-07-17
CN102111936A (en) 2011-06-29
JP2014501023A (en) 2014-01-16

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 20171231