GB2399236A - Control and protection circuit of LEDs - Google Patents

Control and protection circuit of LEDs Download PDF

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Publication number
GB2399236A
GB2399236A GB0305302A GB0305302A GB2399236A GB 2399236 A GB2399236 A GB 2399236A GB 0305302 A GB0305302 A GB 0305302A GB 0305302 A GB0305302 A GB 0305302A GB 2399236 A GB2399236 A GB 2399236A
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GB
United Kingdom
Prior art keywords
resistor
parallel
capacitor
leds
portion consisting
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
GB0305302A
Other versions
GB0305302D0 (en
GB2399236B (en
Inventor
Wen-Hsin Chao
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB0305302A priority Critical patent/GB2399236B/en
Priority to DE20305005U priority patent/DE20305005U1/en
Publication of GB0305302D0 publication Critical patent/GB0305302D0/en
Publication of GB2399236A publication Critical patent/GB2399236A/en
Application granted granted Critical
Publication of GB2399236B publication Critical patent/GB2399236B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • 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]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • 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

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

Abstract

Disclosed is a control and protection circuit for a device comprising parallel sets of a plurality of LEDs each being in parallel with a capacitor. The device further comprises a surge absorber, a bridge rectifier, a transient voltage suppressor, a SCR, a chopper, and a second capacitor for suppressing high frequency and detecting whether a frequent switch is occurred. A surge current is generated if one of the LEDs is malfunctioned. The surge current will be absorbed by the transient voltage suppressor, the SCR, the chopper, and resistors for protecting the remaining LEDs. The invention can eliminate a bulky adapter.

Description

2399236 Title: CONTROL AND PROTECTION CIRCUIT OF LEDS The present
invention relates to LEDs (light-emitting diodes) and more particularly to a control and protection circuit for a device comprising several parallel sets of a plurality of LEDs, thereby eliminating a bulky adapter.
Conventionally, an AC (alternating current) source (e.g., 1] 0V or 220V) must be converted into DC (direct current) having a constant voltage by an adapter prior to applying to a device consisting of a plurality of LEDs. The drawback of the prior art is that the adapter is bulky, and thus the whole device is bulky. Inevitably, it will increase the manufacturing cost.
Moreover, one failed LED may generate a surge current in a circuit of the device. As a result, 0 other LEDs in the circuit may be adversely affected. In a worse condition, the whole device may be malfunctioned. Hence, a need for improvement exists.
It is therefore an aim of the present invention to provide a control and protection circuit for a device comprising several parallel sets of a plurality of LEDs, thereby eliminating a bulky adapter.
According to the present invention, there is provided a LED device comprising a first section including a fuse resistor, a surge absorber in parallel with the fuse resistor, and a series first capacitor, and a first resistor in parallel with the first capacitor, the fuse resistor, the surge absorber, the first resistor, and the first capacitor being adapted to lower voltage of AC fed from a current source; a second section including a bridge rectifier for converting AC into DC, a parallel second capacitor for filtering, a parallel Zener diode typed transient voltage suppressor, a parallel first portion consisting of a second resistor and a SCR, a parallel second portion consisting of a third resistor, a Zoner diode typed chopper, and a third capacitor for suppressing high frequency and detecting whether a frequent switch is occurred, and a parallel fourth capacitor; and a third section including a parallel fourth resistor, a parallel fifth resistor, a first current- liniting resistor, a second current-limiting resistor in parallel with the first current-limiting resistor, a parallel third portion consisting of a sixth resistor, a plurality of first LEDs each being in parallel with a capacitor member, and a seventh resistor, a parallel fourth portion consisting of an eighth resistor, a plurality of second LEDs each being in - 2 parallel with a capacitor member, arid a ninth resistor, and a parallel third portion consisting of a tenth resistor a plurality of third LEDs each being in parallel with a capacitor member, and an eleventh resistor; wherein a surge current is generated if one of the LEDs is malfunctioned, and the surge current will be absorbed by the transient voltage suppressor, the second resistor, the SCR, the third resistor, and the chopper for protecting the remaining LEDs.
The invention will be described in detail with reference to the drawing, in which:-.
FIG. 1 is a circuit diagram of a preferred embodiment of LED device incorporating a control and protection circuit according to the invention.
lo Referring to FIG. 1, there is shown a LED device constructed in accordance with the invention comprising a first section including a fuse resistor Rl, a surge absorber Z1 in parallel with the fuse resistor R1, and a series capacitor C1, and a resistor R2 in parallel with the capacitor C1. The fuse resistor R1, the surge absorber Z1, the parallel resistor R2, and the capacitor C1 are adapted to lower voltage of AC input. The LED device further comprises a second section including a bridge rectifier D for converting AC input into DC, a parallel capacitor C2 for filtering, a parallel Zener diode t.vped transient voltage suppressor TVS1, a parallel portion consisting of a resistor R4 and a SCR (silicon controlled rectifier) Q1, a parallel portion consisting of a resistor R3, a Zener diode typed chopper D5, and a capacitor C3 for suppressing high frequency and detecting whether a frequent switch is occurred, and a parallel capacitor C4. The LED device further comprises a third section including a parallel resistor R5, a parallel resistor R6, a current-limiting resistor R7, a current-limiting resistor R8 in parallel with the resistor R7, a parallel portion consisting of a resistor R9, a plurality of LEDs each being in parallel with a capacitor C, and a resistor R10, a parallel portion consisting of a resistor R11, a plurality of LEDs each being in parallel with a capacitor C, and a resistor R12, and a parallel portion consisting of a resistor R13, a plurality of LEDs each being in parallel with a capacitor C, and a resistor R14. The second section is adapted to provide a stable, constant voltage to the third section. In detail, in case that one of the LEDs is malfunctioned. A surge current is thus generated. Advantageously, the surge current will be absorbed by the transient voltage suppressor TVS1, the resistor R4, the SCR Q1, the resistor R3, and the chopper D5. As a result, the remaining LEDs in the third section will be protected. In other words, the remaining LEDs still function normally.
While the invention has been described by means of specific embodiments, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope of the invention set forth in the claims.

Claims (2)

  1. l. A LED device comprising: a first section including a fuse resistor, a surge absorber in parallel with the fuse resistor, and a series first capacitor, and a first resistor in parallel with the first capacitor, the fuse resistor, the surge absorber, the first resistor, and the first capacitor being adapted to lower voltage of AC fed from a current source; a second section including a bridge rectifier for converting AC into DC, a parallel second capacitor for filtering, a parallel Zener diode typed transient voltage suppressor, a parallel first portion consisting of a second resistor and a SCR, a parallel second portion consisting of a third resistor, a Zener diode typed chopper, and a third lo capacitor for suppressing high frequency and detecting whether a frequent switch is occurred, and a parallel fourth capacitor; and a third section including a parallel fourth resistor, a parallel fifth resistor, a first currentlimiting resistor, a second current-limiting resistor in parallel with the first current-limiting resistor, a parallel third portion consisting of a sixth resistor, a plurality of first LEDs each being in parallel with a capacitor member, and a seventh resistor, a parallel fourth portion consisting of an eighth resistor, a plurality of second LEDs each being in parallel with a capacitor member, and a ninth resistor, and a parallel third portion consisting of a tenth resistor, a plurality of third LEDs each being in parallel with a capacitor member, and an eleventh resistor; wherein a surge current is generated if one of the LEDs is malfunctioned, and the surge current will be absorbed by the transient voltage suppressor, the second resistor, the SCR, the third resistor, and the chopper for protecting the remaining LEDs.
  2. 2. A LED device substantially as described herein with reference to the drawings.
GB0305302A 2003-03-07 2003-03-07 Control and protection circuit of leds Expired - Fee Related GB2399236B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB0305302A GB2399236B (en) 2003-03-07 2003-03-07 Control and protection circuit of leds
DE20305005U DE20305005U1 (en) 2003-03-07 2003-03-27 Control and protection circuit for luminaires with LEDs

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0305302A GB2399236B (en) 2003-03-07 2003-03-07 Control and protection circuit of leds
DE20305005U DE20305005U1 (en) 2003-03-07 2003-03-27 Control and protection circuit for luminaires with LEDs

Publications (3)

Publication Number Publication Date
GB0305302D0 GB0305302D0 (en) 2003-04-09
GB2399236A true GB2399236A (en) 2004-09-08
GB2399236B GB2399236B (en) 2005-03-16

Family

ID=33420309

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0305302A Expired - Fee Related GB2399236B (en) 2003-03-07 2003-03-07 Control and protection circuit of leds

Country Status (2)

Country Link
DE (1) DE20305005U1 (en)
GB (1) GB2399236B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2946827A1 (en) * 2009-06-12 2010-12-17 St Microelectronics Tours Sas CONTROL CIRCUIT OF A LIGHT EMITTING DEVICE WITH LIGHT EMITTING DIODES.
CN103454464A (en) * 2013-07-09 2013-12-18 华立仪表集团股份有限公司 Anti-6kV surge circuit and power supply circuit of electricity meter
WO2015063310A3 (en) * 2013-11-04 2015-07-16 Koninklijke Philips N.V. Surge-protection arrangement

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010037225B4 (en) * 2010-08-30 2013-02-28 Vossloh-Schwabe Deutschland Gmbh Device and method for operating a lighting module with no-load voltage limitation
CN102170120B (en) * 2011-03-16 2015-01-21 上海长园维安微电子有限公司 Bidirectional low-capacitance surge protection device
CN102130448B (en) * 2011-03-16 2015-01-21 上海长园维安微电子有限公司 One-way low-capacitance surge protection device
DE102013102312B3 (en) * 2013-03-08 2014-07-03 Vossloh-Schwabe Deutschland Gmbh Operating circuit for operating light-emitting module at power source, has protective circuit that is switched only into conductive state by control signal, if applied voltage on current limiting circuit exceeds threshold level

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000278859A (en) * 1999-03-24 2000-10-06 Stanley Electric Co Ltd Overvoltage protective circuit for led lighting circuit
JP2002238110A (en) * 2001-02-13 2002-08-23 Kawamura Electric Inc Lightning arrester for panel
WO2003061347A1 (en) * 2002-01-19 2003-07-24 Stührenberg GmbH Signal light comprising light-emitting diodes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000278859A (en) * 1999-03-24 2000-10-06 Stanley Electric Co Ltd Overvoltage protective circuit for led lighting circuit
JP2002238110A (en) * 2001-02-13 2002-08-23 Kawamura Electric Inc Lightning arrester for panel
WO2003061347A1 (en) * 2002-01-19 2003-07-24 Stührenberg GmbH Signal light comprising light-emitting diodes

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2946827A1 (en) * 2009-06-12 2010-12-17 St Microelectronics Tours Sas CONTROL CIRCUIT OF A LIGHT EMITTING DEVICE WITH LIGHT EMITTING DIODES.
CN101925227A (en) * 2009-06-12 2010-12-22 意法半导体(图尔)公司 Control circuit for a led lighting device
EP2268107A1 (en) * 2009-06-12 2010-12-29 STMicroelectronics (Tours) SAS Control circuit for a LED lighting device
US8564209B2 (en) 2009-06-12 2013-10-22 Stmicroelectronics (Tours) Sas Circuit for controlling a lighting unit with light-emitting diodes
CN101925227B (en) * 2009-06-12 2015-02-18 意法半导体(图尔)公司 Control circuit for a led lighting device
US8994283B2 (en) 2009-06-12 2015-03-31 Stmicroelectronics (Tours) Sas Circuit for controlling a lighting unit having a periodic power supply with a thyristor
CN103454464A (en) * 2013-07-09 2013-12-18 华立仪表集团股份有限公司 Anti-6kV surge circuit and power supply circuit of electricity meter
CN103454464B (en) * 2013-07-09 2016-05-18 华立科技股份有限公司 A kind of anti-6KV surge circuit and power supply circuits of ammeter
WO2015063310A3 (en) * 2013-11-04 2015-07-16 Koninklijke Philips N.V. Surge-protection arrangement
US9516720B2 (en) 2013-11-04 2016-12-06 Koninklijke Philips N.V. Surge-protection arrangement
RU2672857C2 (en) * 2013-11-04 2018-11-20 Филипс Лайтинг Холдинг Б.В. Surge-protection arrangement

Also Published As

Publication number Publication date
GB0305302D0 (en) 2003-04-09
GB2399236B (en) 2005-03-16
DE20305005U1 (en) 2003-06-18

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Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20100307