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 PDFInfo
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- 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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Abstract
The invention discloses a driving circuit of a light-emitting diode and a short-circuit protection circuit for the driving circuit. The protection circuit is coupled with a maximum voltage detection circuit, a current balancing circuit and a voltage feedback control circuit, is used for producing a driving control signal and a voltage feedback control signal according to the maximum voltage of the maximum voltage detection circuit so as to deenergize the current balancing circuit and the voltage feedback control circuit, so that the purpose of the short-circuit protection is achieved. Thus, the invention also provides the driving circuit of the light-emitting diode, wherein the driving circuit has a short-circuit protection function.
Description
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. the drive circuit of a light-emitting diode comprises:
Alternating voltage/DC voltage converting circuit in order to the pulse width modulation dimming control signal, converts corresponding first direct voltage to;
Current balance circuit, in order to the drive current of senses flow through many string light-emitting diodes, and control flows is through being somebody's turn to do the drive current of many string light-emitting diodes; And
The voltage feedback control circuit is coupled to this alternating voltage/DC voltage converting circuit, feedbacks control signal to control this first direct voltage in order to receive voltage;
This drive circuit is characterised in that also and comprises:
The ceiling voltage circuit for detecting is in order to the ceiling voltage in the voltage of first end of detecting these many string light-emitting diodes;
Short-circuit protection circuit; 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.
2. drive circuit as claimed in claim 1 is characterized in that also comprising:
Direct voltage/direct voltage booster circuit is second direct voltage in order to this first direct voltage is boosted.
3. drive circuit as claimed in claim 1 is characterized in that, this ceiling voltage circuit for detecting comprises:
A plurality of diode connected in parallel are coupled to first end of these many string light-emitting diodes, to detect this ceiling voltage; And
Resistor & capacitor filter is in order to postpone the time of this this ceiling voltage of short-circuit protection circuit sensing.
4. drive circuit as claimed in claim 1 is characterized in that, this current balance circuit comprises:
A plurality of sensing resistor, these drive currents of going here and there light-emitting diodes convert corresponding voltage to and are sent to this short-circuit protection circuit more in order to flowing through; And
A plurality of switches in order to according to this drive control signal from this short-circuit protection circuit, open and close the drive current of these many string light-emitting diodes of flowing through.
5. drive circuit as claimed in claim 4 is characterized in that, these a plurality of switches are to be N type metal oxide semiconductor transistor.
6. drive circuit as claimed in claim 1 is characterized in that, this short-circuit protection circuit comprises:
Comparator in order to relatively this ceiling voltage and reference voltage, and produces the short circuit control signal according to this; Current control circuit in order to according to this short circuit control signal, produces this drive control signal; And voltage control circuit, in order to according to this short circuit control signal, produce this voltage back coupling control signal.
7. drive circuit as claimed in claim 6 is characterized in that also comprising:
Timer is coupled to the output of this comparator, in order to postpone this short circuit control signal scheduled time.
8. drive circuit as claimed in claim 1 is characterized in that, this ceiling voltage circuit for detecting also comprises:
Zener diode can let this ceiling voltage pass to this short-circuit protection circuit.
9. short-circuit protection circuit that is used for drive circuit, this drive circuit comprises alternating voltage/DC voltage converting circuit, ceiling voltage circuit for detecting, current balance circuit and voltage feedback control circuit, this short-circuit protection circuit is characterised in that also and comprises:
Comparator in order to ceiling voltage and the reference voltage that relatively is received from this ceiling voltage circuit for detecting, and produces the short circuit control signal according to this;
Current control circuit in order to according to this short circuit control signal, produces drive control signal; And
Voltage control circuit in order to according to this short circuit control signal, produces voltage back coupling control signal.
10. short-circuit protection circuit as claimed in claim 9 is characterized in that also comprising:
Timer is coupled to the output of this comparator, in order to postpone this short circuit control signal scheduled time.
11. short-circuit protection circuit as claimed in claim 9 is characterized in that, this drive control signal is in order to close a plurality of switches in this current balance circuit.
12. short-circuit protection circuit as claimed in claim 9 is characterized in that, this voltage back coupling control signal is in order to reduce by first direct voltage of this voltage feedback control circuit control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105004551A CN102438345A (en) | 2010-09-29 | 2010-09-29 | Driving circuit of light-emitting diode and short-circuit protection circuit for driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105004551A CN102438345A (en) | 2010-09-29 | 2010-09-29 | Driving circuit of light-emitting diode and short-circuit protection circuit for driving circuit |
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| Publication Number | Publication Date |
|---|---|
| CN102438345A true CN102438345A (en) | 2012-05-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105004551A Pending CN102438345A (en) | 2010-09-29 | 2010-09-29 | Driving circuit of light-emitting diode and short-circuit protection circuit for driving circuit |
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| CN (1) | CN102438345A (en) |
Cited By (4)
| 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)
| 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 illumination system comprising light source driving circuit |
-
2010
- 2010-09-29 CN CN2010105004551A patent/CN102438345A/en active Pending
Patent Citations (2)
| 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 illumination system comprising light source driving circuit |
Cited By (6)
| 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 |