CN102438345A - Driving circuit of light-emitting diode and short-circuit protection circuit for driving circuit - Google Patents

Driving circuit of light-emitting diode and short-circuit protection circuit for driving circuit Download PDF

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Publication number
CN102438345A
CN102438345A CN2010105004551A CN201010500455A CN102438345A CN 102438345 A CN102438345 A CN 102438345A CN 2010105004551 A CN2010105004551 A CN 2010105004551A CN 201010500455 A CN201010500455 A CN 201010500455A CN 102438345 A CN102438345 A CN 102438345A
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circuit
voltage
short
control signal
drive
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CN2010105004551A
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曾扬玳
许智雄
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Power Forest Technology Corp
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Power Forest Technology Corp
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Abstract

The invention discloses a drive circuit of a light emitting diode and a short-circuit protection circuit for the drive circuit. The short-circuit protection circuit is coupled to the highest voltage detection circuit, the current balance circuit and the voltage feedback control circuit, and is used for generating a driving control signal and a voltage feedback control signal according to the highest voltage from the highest voltage detection circuit so as to disable the current balance circuit and the voltage feedback control circuit, thereby achieving the purpose of short-circuit protection. Therefore, the invention can provide a driving circuit of the light emitting diode with the short-circuit protection function.

Description

The drive circuit of light-emitting diode and be used for the short-circuit protection circuit of drive circuit
Technical field
The invention relates to a kind of drive circuit of light-emitting diode, refer to a kind of drive circuit especially with light-emitting diode of short-circuit protection circuit.
Background technology
In the prior art, the mode of dimming light-emitting diode can be divided into burst mode (burst mode) and two kinds of continuous modes (continuous mode).In the mode of the light modulation of burst mode; The drive circuit of light-emitting diode is to utilize alternating voltage/direct voltage (AC/DC) change-over circuit; Pulse width modulation light modulation (PWM dimming) conversion of signals is become corresponding direct voltage; And the open and close of the drive current of controlling and driving light-emitting diode, according to the mean value of drive current, control the brightness of light-emitting diode then.
In the prior art, the drive circuit of light-emitting diode only provides the open-circuit-protection (open lampprotect) of circuit, or the driving voltage of detecting driven for emitting lights diode is to prevent providing drive current to burn to the electric current groove of light-emitting diode.But when being short-circuited phenomenon, the mechanism of protection is not provided but for light-emitting diode.
Summary of the invention
One embodiment of the invention provide a kind of drive circuit of light-emitting diode.This drive circuit comprises alternating voltage/direct voltage (AC/DC) change-over circuit, ceiling voltage circuit for detecting, current balance circuit, voltage feedback control circuit and short-circuit protection circuit.This alternating voltage/direct voltage (AC/DC) change-over circuit is in order to pulse width modulation dimming control signal (PWM dimming control signal), converts corresponding first direct voltage to; This ceiling voltage circuit for detecting is in order to the ceiling voltage in the voltage of first end of detecting many string light-emitting diodes; This current balance circuit be in order to senses flow through drive current that should many string light-emitting diodes, and control flows is through drive current that should many string light-emitting diodes; This voltage feedback control circuit is to be coupled to this alternating voltage/DC voltage converting circuit, feedbacks control signal to control this first direct voltage in order to receive voltage; And this short-circuit protection circuit is to be coupled to this ceiling voltage circuit for detecting, this current balance circuit and this voltage feedback control circuit; In order to according to this ceiling voltage; Produce drive control signal and this voltage back coupling control signal, with this current balance circuit and this voltage feedback control circuit of deenergizing.
An also embodiment of the present invention provides a kind of short-circuit protection circuit that is used for the drive circuit of light-emitting diode, and this drive circuit comprises alternating voltage/direct voltage (AC/DC) change-over circuit, ceiling voltage circuit for detecting, current balance circuit and voltage feedback control circuit.This short-circuit protection circuit comprises comparator, current control circuit and voltage control circuit.This comparator is in order to ceiling voltage that relatively is received from this ceiling voltage circuit for detecting and reference voltage, and produces the short circuit control signal according to this; This current control circuit is in order to according to this short circuit control signal, produces drive control signal; Reaching this voltage control circuit is in order to according to this short circuit control signal, produces voltage back coupling control signal.
The drive circuit of a kind of light-emitting diode provided by the present invention and be used for the short-circuit protection circuit of the drive circuit of light-emitting diode is to utilize ceiling voltage circuit for detecting detecting ceiling voltage.Then, short-circuit protection circuit produces voltage back coupling control signal and drive control signal, with current balance circuit and the voltage feedback control circuit of deenergizing according to this ceiling voltage.Therefore, the present invention can provide the mechanism of protection when light-emitting diode is short-circuited phenomenon.
Description of drawings
Fig. 1 is the sketch map for the drive circuit of one embodiment of the invention explanation light-emitting diode.
Fig. 2 is the sketch map that the drive circuit of light-emitting diode is described for an also embodiment of the present invention.
Fig. 3 A is the sketch map that the drive circuit of light-emitting diode is described for an also embodiment of the present invention.
Fig. 3 B is the sketch map that the drive circuit of light-emitting diode is described for an also embodiment of the present invention.
Fig. 4 is the sketch map that the short-circuit protection circuit of the drive circuit that is used for light-emitting diode is described for an also embodiment of the present invention.
Fig. 5 is the sketch map that the short-circuit protection circuit of the drive circuit that is used for light-emitting diode is described for an also embodiment of the present invention.
Wherein, description of reference numerals is following:
100,200,300,310 drive circuits
102 alternating voltages/DC voltage converting circuit
104 ceiling voltage circuit for detecting
106 current balance circuits
108 voltage feedback control circuits
110,400,500 short-circuit protection circuits
112 light-emitting diodes
114 direct voltages/direct voltage booster circuit
1102,4102 comparators
1104,4104 current control circuits
1106,4106 voltage control circuits
1108,5108 timers
1042 Zener diodes
1044 resistor & capacitor filters
1062 sensing resistor
1064 switches
The OUT drive control signal
The ILED drive current
V1 first direct voltage
V2 second direct voltage
The VH ceiling voltage
Vcontrol voltage back coupling control signal
The voltage of VIsense detecting current
The VREF reference voltage
VS short circuit control signal
D1～Dn diode
Embodiment
Please with reference to Fig. 1, Fig. 1 is the sketch map for the drive circuit 100 of one embodiment of the invention explanation light-emitting diode.Drive circuit 100 comprises alternating voltage/direct voltage (AC/DC) change-over circuit 102, ceiling voltage circuit for detecting 104, current balance circuit 106, voltage feedback control circuit 108 and short-circuit protection circuit 110.Alternating voltage/direct voltage (AC/DC) change-over circuit 102 is in order to pulse width modulation dimming control signal (PWM dimming control signal); Convert the corresponding first direct voltage V1 to; Wherein the first direct voltage V1 is in order to drive many string light-emitting diodes 112; And the first direct voltage V1 must go here and there the required cross-pressure of light-emitting diode 112 greater than each; For example a string light-emitting diode 112 comprises the light-emitting diode (the required cross-pressure of light-emitting diode is 3V) of 8 series connection, and then the first direct voltage V1 must be greater than 24V, but the present invention is not limited to the light-emitting diode that a string light-emitting diode 112 comprises 8 series connection.Ceiling voltage circuit for detecting 104 is in order to the ceiling voltage VH in the voltage of first end of detecting many string light-emitting diodes 112; Wherein ceiling voltage circuit for detecting 104 is to utilize a plurality of diode connected in parallel D1～Dn to be coupled to first end of many string light-emitting diodes 112, with detecting ceiling voltage VH.When wherein short circuit phenomenon appearred in a string light-emitting diode 112, the Zener diode in the ceiling voltage circuit for detecting 104 (zener diode) 1042 meeting conductings let ceiling voltage VH pass to short-circuit protection circuit 110.In addition, the resistor & capacitor filter 1044 that ceiling voltage circuit for detecting 104 comprises is in order to postpone the time that short-circuit protection circuit 110 senses ceiling voltage VH.Current balance circuit 106 is in order to the drive current ILED of senses flow through many string light-emitting diodes 112, and control flows is through the drive current ILED of many string light-emitting diodes 112.Voltage feedback control circuit 108 is to be coupled to alternating voltage/DC voltage converting circuit 102, feedbacks control signal Vcontrol to control the first direct voltage V1 in order to receive voltage.Short-circuit protection circuit 110 is to be coupled to ceiling voltage circuit for detecting 104, current balance circuit 106 and voltage feedback control circuit 108; In order to according to ceiling voltage VH; Produce drive control signal OUT and voltage back coupling control signal Vcontrol, to remove Control current balancing circuitry 106 and voltage feedback control circuit 108.In addition; Current balance circuit 106 comprises a plurality of sensing resistor 1062; Drive current ILED in order to many string light-emitting diodes 112 of will flowing through converts the voltage VIsense of corresponding detecting current to and is sent to short-circuit protection circuit 110, and a plurality of switches 1064, in order to the drive control signal OUT of basis from short-circuit protection circuit 110; The drive current ILED of the light-emitting diodes 112 of string more than open and close are flowed through, wherein a plurality of switches 1064 are to be N type metal oxide semiconductor transistor.
Short-circuit protection circuit 110 comprises comparator 1102, current control circuit 1104 and voltage control circuit 1106.Behind the ceiling voltage VH that short-circuit protection circuit 110 receives from ceiling voltage circuit for detecting 104, comparator 1102 is ceiling voltage VH and reference voltage VREF relatively, if ceiling voltage VH, then produces short circuit control signal VS greater than reference voltage VREF.Current control circuit 1104 is to be coupled to comparator 1102, in order to according to short circuit control signal VS, removes to close drive control signal OUT and is sent to current balance circuit 106.Voltage control circuit 1106 is to be coupled to comparator 1102, in order to according to short circuit control signal VS, removes to close voltage and feedbacks control signal Vcontrol to voltage feedback control circuit 108.
。Therefore, when many strings light-emitting diode 112 was short-circuited situation, current balance circuit 106 all can be closed with voltage feedback control circuit 108, with protection drive circuit 100.
Please with reference to Fig. 2, Fig. 2 is the sketch map that the drive circuit 200 of light-emitting diode is described for an also embodiment of the present invention.The difference of drive circuit 200 and drive circuit 100 is that drive circuit 200 also comprises direct voltage/direct voltage (DC/DC boost) circuit 114 that boosts; Be coupled to alternating voltage/direct voltage (AC/DC) change-over circuit 102 and go here and there between the light-emitting diode 112 more; (Vcontrol directly control direct voltage/direct voltage boost (DC/DC boost) circuit 114 unlatching or close) be the second direct voltage V2 in order to the first direct voltage V1 is boosted, and drive many string light-emitting diodes 112 by the second direct voltage V2.For example the first direct voltage V1 is 3V, and boosts to the 12V/24V of the second direct voltage V2, be 3V but the present invention is not limited to the first direct voltage V1, and the second direct voltage V2 is 12V/24V.All the other operating principles of drive circuit 200 are all identical with drive circuit 100, repeat no more at this.
Please with reference to Fig. 3 A, Fig. 3 A is the sketch map that the drive circuit 300 of light-emitting diode is described for an also embodiment of the present invention.The difference of drive circuit 300 and drive circuit 100 is that short-circuit protection circuit 110 also comprises timer 1108, is coupled to the output of comparator 1102, in order to postpone short circuit control signal VS scheduled time T1.And all the other operating principles of drive circuit 300 are all identical with moving circuit 100, repeat no more at this.
Please with reference to Fig. 3 B, Fig. 3 B is the sketch map that the drive circuit 310 of light-emitting diode is described for an also embodiment of the present invention.Drive circuit 310 also comprises direct voltage/direct voltage boost (DC/DC boost) circuit 114 and timer 1108; Wherein, Direct voltage/direct voltage (DC/DC boost) circuit 114 that boosts is to be coupled to alternating voltage/direct voltage (AC/DC) change-over circuit 102 and to go here and there between the light-emitting diode 112 more; In order to the first direct voltage V1 is boosted is the second direct voltage V2, and timer 1108 is the outputs that are coupled to comparator 1102, in order to postpone short circuit control signal VS scheduled time T1.And all the other operating principles of drive circuit 310 are all identical with drive circuit 100, repeat no more at this.
Please with reference to Fig. 4, Fig. 4 is the sketch map that the short-circuit protection circuit 400 of the drive circuit that is used for light-emitting diode is described for an also embodiment of the present invention.Short-circuit protection circuit 400 comprises comparator 4102, current control circuit 4104 and voltage control circuit 4106.Behind the short-circuit protection circuit 400 ceiling voltage VHs of reception from the ceiling voltage circuit for detecting 104 of drive circuit 100; Comparator 4102 is ceiling voltage VH and reference voltage VREF relatively; If ceiling voltage VH, then produces short circuit control signal VS greater than reference voltage VREF.Current control circuit 4104 is to be coupled to comparator 4102, in order to according to short circuit control signal VS, removes to close the current balance circuit 106 that drive control signal OUT is sent to drive circuit 100.Voltage control circuit 4106 is to be coupled to comparator 4102, in order to according to short circuit control signal VS, removes to close voltage and feedbacks control signal Vcontrol the voltage feedback control circuit 108 that is sent to drive circuit 100.In addition, when current balance circuit 106 receives drive control signal OUT when closing, a plurality of switches 1064 will cut out the drive current ILED of many string light-emitting diodes 112 of flowing through.
Please with reference to Fig. 5, Fig. 5 is the sketch map that the short-circuit protection circuit 500 of the drive circuit that is used for light-emitting diode is described for an also embodiment of the present invention.The difference of short-circuit protection circuit 500 and short-circuit protection circuit 400 is that short-circuit protection circuit 500 also comprises timer 5108, is coupled to the output of comparator 4102, in order to postpone short circuit control signal VS scheduled time T1.And all the other operating principles of short-circuit protection circuit 500 are all identical with short-circuit protection circuit 400, repeat no more at this.
In sum; The drive circuit of light-emitting diode provided by the invention and be used for the short-circuit protection circuit of the drive circuit of light-emitting diode; Utilize ceiling voltage circuit for detecting detecting ceiling voltage; Short-circuit protection circuit produces voltage back coupling control signal and drive control signal, with current balance circuit and the voltage feedback control circuit of deenergizing according to ceiling voltage.Therefore, the present invention can provide the mechanism of protection when light-emitting diode is short-circuited phenomenon.
The above is merely the preferred embodiments of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.

Claims (12)

1.一种发光二极管的驱动电路，包括：1. A driving circuit for a light-emitting diode, comprising: 交流电压/直流电压转换电路，用以将脉冲宽度调变调光控制信号，转换成相对应的第一直流电压；An AC voltage/DC voltage conversion circuit, used to convert the PWM dimming control signal into a corresponding first DC voltage; 电流平衡电路，用以感测流经多串发光二极管的驱动电流，并控制流经该多串发光二极管的驱动电流；及a current balancing circuit, used for sensing the driving current flowing through the multiple strings of light emitting diodes, and controlling the driving current flowing through the multiple strings of light emitting diodes; and 电压回授控制电路，耦接于该交流电压/直流电压转换电路，用以接收电压回授控制信号以控制该第一直流电压；a voltage feedback control circuit, coupled to the AC voltage/DC voltage conversion circuit, for receiving a voltage feedback control signal to control the first DC voltage; 该驱动电路的特征在于还包括：The driving circuit is characterized in that it also includes: 最高电压侦测电路，用以侦测该多串发光二极管的第一端的电压中的最高电压；The highest voltage detection circuit is used to detect the highest voltage among the voltages at the first terminals of the plurality of strings of light-emitting diodes; 短路保护电路，耦接于该最高电压侦测电路、该电流平衡电路及该电压回授控制电路，用以根据该最高电压，产生驱动控制信号和该电压回授控制信号，以去能该电流平衡电路和该电压回授控制电路。The short circuit protection circuit is coupled to the maximum voltage detection circuit, the current balance circuit and the voltage feedback control circuit, and is used to generate a drive control signal and the voltage feedback control signal according to the maximum voltage to disable the current A balance circuit and the voltage feedback control circuit. 2.如权利要求1所述的驱动电路，其特征在于还包括：2. The drive circuit according to claim 1, further comprising: 直流电压/直流电压升压电路，用以将该第一直流电压升压为第二直流电压。The DC voltage/DC voltage step-up circuit is used to boost the first DC voltage to a second DC voltage. 3.如权利要求1所述的驱动电路，其特征在于，该最高电压侦测电路包括：3. The drive circuit according to claim 1, wherein the highest voltage detection circuit comprises: 多个并联的二极管，耦接于该多串发光二极管的第一端，以侦测该最高电压；及a plurality of diodes connected in parallel, coupled to the first ends of the plurality of strings of LEDs, to detect the highest voltage; and 电阻电容滤波器，用以延迟该短路保护电路感测该最高电压的时间。The resistor-capacitor filter is used to delay the time when the short-circuit protection circuit senses the highest voltage. 4.如权利要求1所述的驱动电路，其特征在于，该电流平衡电路包括：4. The driving circuit according to claim 1, wherein the current balancing circuit comprises: 多个感测电阻，用以将流经该多串发光二极管的驱动电流转换成相对应的电压并传送至该短路保护电路；及A plurality of sensing resistors are used to convert the driving current flowing through the multiple strings of LEDs into corresponding voltages and transmit them to the short circuit protection circuit; and 多个开关，用以根据来自该短路保护电路的该驱动控制信号，开启与关闭流经该多串发光二极管的驱动电流。A plurality of switches are used for turning on and off the driving current flowing through the multiple strings of LEDs according to the driving control signal from the short circuit protection circuit. 5.如权利要求4所述的驱动电路，其特征在于，该多个开关是为N型金属氧化物半导体晶体管。5. The driving circuit as claimed in claim 4, wherein the plurality of switches are N-type metal-oxide-semiconductor transistors. 6.如权利要求1所述的驱动电路，其特征在于，该短路保护电路包括：6. The drive circuit according to claim 1, wherein the short circuit protection circuit comprises: 比较器，用以比较该最高电压和参考电压，并据以产生短路控制信号；电流控制电路，用以根据该短路控制信号，产生该驱动控制信号；及电压控制电路，用以根据该短路控制信号，产生该电压回授控制信号。a comparator, used to compare the highest voltage with a reference voltage, and generate a short circuit control signal accordingly; a current control circuit, used to generate the drive control signal according to the short circuit control signal; and a voltage control circuit, used to control the short circuit according to the signal to generate the voltage feedback control signal. 7.如权利要求6所述的驱动电路，其特征在于还包括：7. The drive circuit according to claim 6, further comprising: 定时器，耦接于该比较器的输出端，用以延迟该短路控制信号预定时间。A timer, coupled to the output terminal of the comparator, is used to delay the short-circuit control signal for a predetermined time. 8.如权利要求1所述的驱动电路，其特征在于，该最高电压侦测电路还包括：8. The drive circuit according to claim 1, wherein the highest voltage detection circuit further comprises: 齐纳二极管，可让该最高电压通过至该短路保护电路。A zener diode that allows the highest voltage to pass to the short circuit protection circuit. 9.一种用于驱动电路的短路保护电路，该驱动电路包括交流电压/直流电压转换电路、最高电压侦测电路、电流平衡电路及电压回授控制电路，该短路保护电路的特征在于还包括：9. A short-circuit protection circuit for a drive circuit, the drive circuit includes an AC voltage/DC voltage conversion circuit, a maximum voltage detection circuit, a current balance circuit and a voltage feedback control circuit, and the short-circuit protection circuit is characterized in that it also includes : 比较器，用以比较接收自该最高电压侦测电路的最高电压和参考电压，并据以产生短路控制信号；a comparator, used to compare the highest voltage received from the highest voltage detection circuit with a reference voltage, and generate a short circuit control signal accordingly; 电流控制电路，用以根据该短路控制信号，产生驱动控制信号；及a current control circuit for generating a driving control signal according to the short-circuit control signal; and 电压控制电路，用以根据该短路控制信号，产生电压回授控制信号。The voltage control circuit is used for generating a voltage feedback control signal according to the short circuit control signal. 10.如权利要求9所述的短路保护电路，其特征在于还包括：10. The short circuit protection circuit according to claim 9, further comprising: 定时器，耦接于该比较器的输出端，用以延迟该短路控制信号预定时间。A timer, coupled to the output terminal of the comparator, is used to delay the short-circuit control signal for a predetermined time. 11.如权利要求9所述的短路保护电路，其特征在于，该驱动控制信号是用以关闭该电流平衡电路内的多个开关。11. The short circuit protection circuit as claimed in claim 9, wherein the driving control signal is used to turn off a plurality of switches in the current balancing circuit. 12.如权利要求9所述的短路保护电路，其特征在于，该电压回授控制信号是用以降低该电压回授控制电路控制的第一直流电压。12. The short circuit protection circuit as claimed in claim 9, wherein the voltage feedback control signal is used to reduce the first DC voltage controlled by the voltage feedback control circuit.
CN2010105004551A 2010-09-29 2010-09-29 Driving circuit of light-emitting diode and short-circuit protection circuit for driving circuit Pending CN102438345A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103874274A (en) * 2012-12-07 2014-06-18 力智电子股份有限公司 Short-circuit protection circuit and short-circuit protection method of light-emitting diode and driving device thereof
WO2014187018A1 (en) * 2013-05-24 2014-11-27 深圳市华星光电技术有限公司 Short circuit protection circuit and electronic device having same
CN107197569A (en) * 2017-07-25 2017-09-22 合肥惠科金扬科技有限公司 A kind of LED backlight Drive Protecting Circuit and display device
CN109156073A (en) * 2016-03-25 2019-01-04 株式会社艾泰克系统 The short-circuit method for detecting abnormality of the short-circuit abnormal detector of LED illumination System, the LED light device with the device and LED illumination System

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101527120A (en) * 2008-03-05 2009-09-09 三星电子株式会社 Method of driving a light source, light source device for performing the same, and display device having the light source device
CN101636018A (en) * 2008-07-21 2010-01-27 达方电子股份有限公司 Light source driving circuit and lighting system comprising same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101527120A (en) * 2008-03-05 2009-09-09 三星电子株式会社 Method of driving a light source, light source device for performing the same, and display device having the light source device
CN101636018A (en) * 2008-07-21 2010-01-27 达方电子股份有限公司 Light source driving circuit and lighting system comprising same

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103874274A (en) * 2012-12-07 2014-06-18 力智电子股份有限公司 Short-circuit protection circuit and short-circuit protection method of light-emitting diode and driving device thereof
CN103874274B (en) * 2012-12-07 2016-09-14 力智电子股份有限公司 Short-circuit protection circuit and short-circuit protection method of light-emitting diode and driving device thereof
WO2014187018A1 (en) * 2013-05-24 2014-11-27 深圳市华星光电技术有限公司 Short circuit protection circuit and electronic device having same
CN109156073A (en) * 2016-03-25 2019-01-04 株式会社艾泰克系统 The short-circuit method for detecting abnormality of the short-circuit abnormal detector of LED illumination System, the LED light device with the device and LED illumination System
CN109156073B (en) * 2016-03-25 2020-07-24 株式会社艾泰克系统 L ED lighting system short circuit abnormity detection device and method, L ED lighting device
CN107197569A (en) * 2017-07-25 2017-09-22 合肥惠科金扬科技有限公司 A kind of LED backlight Drive Protecting Circuit and display device

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Application publication date: 20120502