CN109587423A - Back-light starting circuit - Google Patents
Back-light starting circuit Download PDFInfo
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- CN109587423A CN109587423A CN201811140339.6A CN201811140339A CN109587423A CN 109587423 A CN109587423 A CN 109587423A CN 201811140339 A CN201811140339 A CN 201811140339A CN 109587423 A CN109587423 A CN 109587423A
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- 238000012163 sequencing technique Methods 0.000 claims abstract description 21
- 239000003990 capacitor Substances 0.000 claims description 49
- 230000003287 optical effect Effects 0.000 claims description 35
- 230000005611 electricity Effects 0.000 claims description 13
- 238000002955 isolation Methods 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 102100039435 C-X-C motif chemokine 17 Human genes 0.000 description 1
- 101000889048 Homo sapiens C-X-C motif chemokine 17 Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/57—Control of contrast or brightness
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention belongs to TV power driving control fields, provide a kind of back-light starting circuit, comprising: power supply sequencing control circuit and soft starting circuit；Power supply sequencing control circuit includes: energy supply control module and power supply module；Energy supply control module sends power supply Continuity signal to power supply module when receiving the driving signal of external control devices；Power supply module is powered when receiving power supply Continuity signal for back lighting device and pfc circuit, pfc circuit work；Soft starting circuit includes: time delay module and backlight control module；Time delay module is when receiving driving signal to backlight control module outputting drive voltage；Backlight control module receives the predeterminated voltage of preset reference power input, the driving back lighting device work when driving voltage is less than predeterminated voltage.The present invention can accurately control the starting time of back lighting device, meet the timing requirements for starting back lighting device after first starting pfc circuit, avoid current over pulse, high reliablity, and circuit element is few, at low cost.
Description
Technical field
It is more specifically to be related to a kind of back the invention belongs to TV (Television, TV) power driving control field
Photopolymerization initiation circuit.
Background technique
Currently, TV power supply backlight drive circuit is mainly made of circuit of power factor correction and flyback backlight drive circuit.
When controlling signal and being high level, circuit of power factor correction works, and then circuit of power factor correction builtin voltage passes through resistance
Capacitor charging is slowly given, when capacitor both end voltage reaches flyback backlight LED (Light Emitting Diode, light emitting diode)
After the trigger voltage of driving circuit, which just starts to work, and the delay precision of the circuit is poor, delay time be easy by
The influence of the voltage of PFC (Power Factor Correction, PFC) circuit chip, it is additional increased soft to open
Dynamic circuit is also easy to cause integrated circuit unstable, so that backlight control circuit poor reliability, at high cost.
Summary of the invention
In consideration of it, the present invention provides a kind of back-light starting circuit, it is intended to backlight control circuit time delay precision in the prior art
It is poor, at high cost, so that the problem of circuit reliability difference.
The embodiment provides a kind of back-light starting circuits, comprising: power supply sequencing control circuit and soft start electricity
Road, the power supply sequencing control circuit and the soft starting circuit are adapted to connect with external control devices and back lighting device, institute
Power supply sequencing control circuit is stated to be further adapted for connecting with pfc circuit, the power supply sequencing control circuit include: energy supply control module and
Power supply module；
The energy supply control module is connect with the power supply module, in the driving for receiving the external control devices
Power supply Continuity signal is sent to the power supply module when signal；
The power supply module is used to power when receiving the power supply Continuity signal for back lighting device and pfc circuit, so that
Pfc circuit work；
The soft starting circuit includes: time delay module and backlight control module；
The time delay module is connect with the backlight control module, is used for when receiving the driving signal to the back
Photocontrol module outputting drive voltage；
The backlight control module is suitable for connecting with preset reference power supply, for receiving the preset reference power input
Predeterminated voltage, drive the back lighting device to work when the driving voltage is less than the predeterminated voltage.
Optionally, the energy supply control module include: input, output end, first resistor, second resistance, 3rd resistor,
First capacitor, the first triode and the first optical coupled switch；
The input terminal of the energy supply control module is connect with the external control devices, the output of the energy supply control module
End is connect with the power supply module；
The base stage of first triode is connect by the first resistor with the input terminal of the energy supply control module, institute
The base stage for stating the first triode is also connect by the second resistance with the emitter of first triode, the one or three pole
The emitter of pipe is grounded, and the collector of first triode is connect with the primary side output end of first optical coupled switch, described
First capacitor is in parallel with the second resistance；
The primary side input terminal of first optical coupled switch is connect by the 3rd resistor with the first power supply, first light
The secondary of coupling switch connects in input terminal with the output end of output end described energy supply control module when pair.
Optionally, the power supply module includes: input, output end, the 4th resistance, the 5th resistance, the 6th resistance, second
Capacitor, the second triode, first diode and zener diode；
The input terminal of the power supply module is connect with the output end of the energy supply control module, the output of the power supply module
End is connect with the back lighting device and the pfc circuit respectively；
The base stage of second triode respectively with secondary side output end, the zener diode of first optical coupled switch
Cathode, the 5th resistance first end connected with the first end of second capacitor, the emitter of second triode
Connect with the anode of the first diode, the collector of second triode respectively with external power supply, the one or two pole
The cathode of pipe is connected with the first end of the 4th resistance；
The second end of 4th resistance is connect with the secondary side input terminal of first optical coupled switch；The zener diode
Anode, the second end of the 5th resistance and the second end of second capacitor be grounded；
The anode of the first diode is suitable for connecting with the pfc circuit, is also suitable for and institute by the 6th resistance
State back lighting device connection.
Optionally, the time delay module includes: input, output end, delay unit, isolated location and vent unit；
The input terminal of the time delay module is connect with the external control devices, the output end of the time delay module with it is described
Backlight control module connection；
The delay unit, input terminal are connect with the input terminal of the time delay module, output end and the isolated location
Input terminal is connected with the input terminal of the vent unit, for being charged according to the driving signal, and it is defeated to the isolated location
First voltage out；
The isolated location, output end are connect with the output end of the time delay module, for carrying out to the first voltage
It is isolated to the backlight control module and exports the driving voltage；
The vent unit, output end are connect with the input terminal of the isolated location, for being low in the driving signal
When level, the voltage that the delay unit stores is released.
Optionally, the delay unit includes: the first delay capacitor；
The anode of first delay capacitor is connect with the input terminal of the delay unit, and first delay capacitor is born
Pole is connect with the output end of the delay unit.
Optionally, the isolated location includes: the first isolating diode；
The anode of first isolating diode is connect with the input terminal of the isolated location, first isolating diode
Cathode connect with the output end of the isolated location.
Optionally, the vent unit includes: the first bleeder resistance, the second bleeder resistance and the second isolating diode；
The first end of first bleeder resistance is connect with the input terminal of the vent unit, first bleeder resistance
Second end is connect with the first end of second bleeder resistance；
The second end of second bleeder resistance is connect with the anode of second isolating diode；
The cathode of second isolating diode is connect with the output end of the vent unit.
Optionally, the backlight control module includes: input, output end, judging unit, the second optical coupled switch, the 7th
Resistance, the 8th resistance and the 9th resistance；
The input terminal of the backlight control module is connect with the time delay module, the output end of the backlight control module with
The back lighting device connection, the input terminal of the judging unit are connect with the input terminal of the backlight control module, the judgement
The first voltage end of unit is connect with external power supply, and the second voltage end of the judging unit and the preset reference power supply connect
It connects, the output end of the judging unit is connect by the 9th resistance with the primary side output end of second optical coupled switch；Institute
State size of the judging unit for the driving voltage and the predeterminated voltage；
The primary side input terminal of second optical coupled switch is connect by the 7th resistance with external power supply, the 8th electricity
It hinders in parallel with the primary side of second optical coupled switch；Second optical coupled switch it is secondary in input terminal and it is secondary while output end and institute
State the output end connection of backlight control module.
Optionally, the judging unit includes: transport and placing device, the tenth resistance, third capacitor and the 4th capacitor；
The normal phase input end of the transport and placing device is connect with the second voltage end of the judging unit, the negative of the transport and placing device
Input terminal is connect with the input terminal of the judging unit, and the output end of the output end of the transport and placing device and the judging unit connects
It connects, the power positive end of the transport and placing device is connect with the first voltage end of the judging unit, and the power supply negative terminal of the transport and placing device connects
Ground；
The first end of the third capacitor is connect with the negative-phase input of the transport and placing device, the second end of the third capacitor
It is connect with the output end of the transport and placing device；The first end of tenth resistance is connect with the negative-phase input of the transport and placing device, institute
The second end for stating the tenth resistance is connect by the 4th capacitor with the output end of the transport and placing device.
The beneficial effect of back-light starting circuit compared with prior art is in the embodiment of the present invention: power supply timing control electricity
Road can provide voltage simultaneously for back lighting device and pfc circuit, few with the circuit element of existing power supply sequencing control circuit, at
This is low；Judge that the relationship of predeterminated voltage and driving voltage drives whether back lighting device works by passing through in soft starting circuit, i.e.,
When the driving voltage is greater than the predeterminated voltage, back lighting device does not work, and is less than the predeterminated voltage in the driving voltage
When backlight control module control back lighting device work, back lighting device is accurately controlled by the relationship of predeterminated voltage and driving voltage
Start the time, provides soft start for back lighting device, reached the requirement that pfc circuit first works, works after back lighting device, avoided
Current over pulse, high reliablity.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is the structural schematic diagram of back-light starting circuit provided in an embodiment of the present invention；
Fig. 2 is the circuit diagram of power supply sequencing control circuit provided in an embodiment of the present invention；
Fig. 3 is the circuit diagram of time delay module provided in an embodiment of the present invention；
Fig. 4 is the circuit diagram of soft starting circuit provided in an embodiment of the present invention；
Fig. 5 is the circuit diagram of another soft starting circuit provided in an embodiment of the present invention.
Specific embodiment
In being described below, for illustration and not for limitation, the tool of such as particular system structure, technology etc is proposed
Body details, to understand thoroughly the embodiment of the present invention.However, it will be clear to one skilled in the art that there is no these specific
The present invention also may be implemented in the other embodiments of details.In other situations, it omits to well-known system, device, electricity
The detailed description of road and method, in case unnecessary details interferes description of the invention.
In order to illustrate technical solutions according to the invention, the following is a description of specific embodiments.
Referring to Fig. 1, a kind of back-light starting circuit provided in an embodiment of the present invention, including 100 He of power supply sequencing control circuit
Soft starting circuit 200.Power supply sequencing control circuit 100 and soft starting circuit 200 are adapted to fill with external control devices and backlight
Connection is set, power supply sequencing control circuit 100 is further adapted for connecting with pfc circuit.
Wherein, power supply sequencing control circuit 100 includes: energy supply control module 110 and power supply module 120.Power supply controls mould
Block 110 is connect with power supply module 120.Energy supply control module 110 is when receiving the driving signal of the external control devices to institute
It states power supply module 120 and sends power supply Continuity signal.Power supply module 120 when receiving the power supply Continuity signal for back lighting device and
Pfc circuit power supply, so that pfc circuit works.
Soft starting circuit 200 includes: time delay module 210 and backlight control module 220.Time delay module 210 and backlight control
Module 220 connects；Time delay module 210 is when receiving the driving signal to 220 outputting drive voltage of backlight control module；Backlight
Control module 220 is suitable for connecting with preset reference power supply, for receiving the predeterminated voltage of the preset reference power input, in institute
The back lighting device is driven to work when stating driving voltage less than the predeterminated voltage.
In practical application, power supply sequencing control circuit 100 receives the driving signal VBL_CTRL of external control devices, simultaneously
It powers for pfc circuit and back lighting device, pfc circuit works at this time.Time delay module 210 in soft starting circuit 200 receives driving
To 220 outputting drive voltage of backlight control module, when driving voltage is greater than predeterminated voltage VREF, backlight control when signal VBL_CTRL
Molding block 220 exports invalid signals, and back lighting device does not work；When driving voltage is less than predeterminated voltage VREF, backlight control mould
Block 220 works to back lighting device output drive signal, back lighting device.Gradually it is less than the mistake of predeterminated voltage VREF in driving voltage
Journey realizes and pfc circuit is first connected, starts back lighting device afterwards, avoids current over pulse, high reliablity, while driving voltage gradually
The time of process less than predeterminated voltage VREF, is the starting time of back lighting device, that is, realizes precisely delay.
Above-mentioned back-light starting circuit, power supply sequencing control circuit 100 can provide electricity simultaneously for back lighting device and pfc circuit
Pressure, it is few with the circuit element of existing power supply sequencing control circuit, it is at low cost；By pre- by judgement in soft starting circuit 200
If whether the relationship of voltage and driving voltage driving back lighting device works, i.e., when the driving voltage is greater than the predeterminated voltage
Back lighting device does not work, and when the driving voltage is less than the predeterminated voltage, back lighting device works, and by predeterminated voltage and drives
The relationship of dynamic voltage accurately controls the starting time of back lighting device, provides soft start for back lighting device, has reached pfc circuit elder generation
The requirement to work after work, back lighting device, avoids current over pulse, high reliablity.
In one embodiment, referring to fig. 2, energy supply control module 110 includes: input, output end, first resistor R1,
Two resistance R2,3rd resistor R3, first capacitor C1, the first triode Q1 and the first optical coupled switch PUB.
The input terminal of energy supply control module 110 is connect with external control devices, the output end of energy supply control module 110 and confession
Electric module 120 connects.
The base stage of first triode Q1 is connect by the first resistor R1 with the input terminal of energy supply control module 110, the
The base stage of one triode Q1 also passes through second resistance R 2 and connect with the emitter of the first triode Q1, the hair of the first triode Q1
Emitter grounding, the collector of the first triode Q1 are connect with the primary side output end of the first optical coupled switch PUB, first capacitor C1 and
Two resistance R2 are in parallel.
The primary side input terminal of first optical coupled switch PUB is connect by 3rd resistor R3 with the first power supply (+12V), the first light
The secondary of coupling switch PUB connects in input terminal with the output end of output end equal energy supply control module 110 when pair.
In one embodiment, referring to fig. 2, power supply module 120 includes: input, output end, the 4th resistance R4, the 5th electricity
Hinder R5, the 6th resistance R6, the second capacitor C2, the second triode Q2, first diode D1 and zener diode Z1.
The input terminal of power supply module 120 is connect with the output end of energy supply control module 110, the output end of power supply module 120
It is connect respectively with back lighting device LED and pfc circuit.
The base stage of the second triode Q2 yin with the secondary side output end of the first optical coupled switch PUB, zener diode Z1 respectively
Pole, the 5th resistance R5 first end connected with the first end of the second capacitor C2, the emitter of the second triode Q2 and the one or two pole
The anode of pipe C1 connects, the collector of the second triode Q2 respectively with external power supply VCC1, the cathode of first diode D1 and the
The first end of four resistance R4 connects.
The second end of 4th resistance R4 is connect with the secondary side input terminal of the first optical coupled switch PUB；The sun of zener diode Z1
The second end of pole, the second end of the 5th resistance R5 and the second capacitor C2 is grounded.The anode of first diode D1 be suitable for it is described
Pfc circuit connection, also is suitable for connecting with back lighting device LED by the 6th resistance R6.
In one embodiment, referring to Fig. 3, time delay module 210 includes: input, output end, delay unit 211, isolation list
Member 212 and vent unit 213.
The input terminal of time delay module 210 is connect with external control devices, the output end and backlight control mould of time delay module 210
Block 220 connects.
The input terminal of delay unit 211 is connect with the input terminal of time delay module 210, the output end of delay unit 211 with every
Input terminal from unit 212 is connected with the input terminal of vent unit 213, for being charged according to driving signal VBL_CTRL, and to
Isolated location 212 exports first voltage.
The output end of isolated location 212 is connect with the output end of time delay module 210, for the first voltage carry out every
Descriscent backlight control module 220 exports the driving voltage.
The output end of vent unit 213 is connect with the input terminal of isolated location 212, for being low electricity in the driving signal
Usually, the voltage that delay unit 211 stores is released.
The voltage that delay unit 211 is exported when receiving driving signal VBL_CTRL to isolated location 212 is bigger, by
It charges in delay unit 211, both end voltage will increase, and the voltage exported to isolated location 212 can also reduce, when reduced voltage
When less than predeterminated voltage, backlight control module 220 drives back lighting device work, realizes delay, and delay time can be single by delay
The charging time of member 211 determines.
In one embodiment, referring to Fig. 3, delay unit 211 includes: the first delay capacitor SE1.
The anode of first delay capacitor SE1 is connect with the input terminal of the delay unit 211, the first delay capacitor SE1's
Cathode is connect with the output end of the delay unit 211.
In one embodiment, referring to Fig. 3, isolated location 212 includes: the first isolating diode SD1.
The anode of first isolating diode SD1 is connect with the input terminal of isolated location 212, the first isolating diode SD1's
Cathode is connect with the output end of isolated location 212.First isolating diode SD1 can be to avoid delay unit 211 to current loop
Influence.
In one embodiment, referring to Fig. 3, vent unit 213 includes: the first bleeder resistance SR1, the second bleeder resistance SR2
With the second isolating diode SD2.
The first end of first bleeder resistance SR1 is connect with the input terminal of vent unit 213, and the of the first bleeder resistance SR1
Two ends are connect with the first end of the second bleeder resistance SR2；The second end of second bleeder resistance SR2 and the second isolating diode SD2
Anode connection；The cathode of second isolating diode SD2 is connect with the output end of vent unit 213.First bleeder resistance SR1 can
Isolated location 212 is completely switched off when guaranteeing the driving signal as high level；Two poles of the isolation of second bleeder resistance SR2 and second
Pipe SD2 forms bleed-off circuit, and when the driving signal is low level, the voltage on delay unit 211 can be released rapidly
Fall.
First delay capacitor SE1 can charge when driving signal is high level, while export to isolated location 212
Predeterminated voltage, with the increase of the first delay capacitor SE1 both end voltage, predeterminated voltage reduces, since driving signal voltage is fixed,
The capacity of first delay capacitor SE1 is certain, therefore the delay time of the first delay capacitor SE1 is accurate, utilizes the first delay capacitor SE1
Slow charging process, realize that the pfc circuit requirement that first works, work after back lighting device, the booting for realizing back lighting device are soft
Starting avoids current over pulse, improves system stability.
In one embodiment, referring to fig. 4, backlight control module 220 includes: input, output end, judging unit 221,
Two optical coupled switch SU2B, the 7th resistance R7, the 8th resistance R8 and the 9th resistance R9.
The input terminal of backlight control module 220 is connect with time delay module 210, the output end and back of backlight control module 220
Electro-optical device LED connection.
The input terminal of judging unit 221 is connect with the input terminal of backlight control module 220, the first electricity of judging unit 221
Pressure side is connect with external power supply (+12V), and the second voltage end of judging unit 221 is connect with preset reference power supply, judging unit
221 output end is connect by the 9th resistance R9 with the primary side output end of the second optical coupled switch SU2B；Judging unit 221 be used for than
The size of the driving voltage and predeterminated voltage VREF drives backlight when the driving voltage is less than predeterminated voltage VREF
Device work.
The primary side input terminal of second optical coupled switch SU2B is connect by the 7th resistance R7 with external power supply (+12V), the 8th electricity
It is in parallel with the primary side of the second optical coupled switch SU2B to hinder R8；Second optical coupled switch SU2B it is secondary in input terminal and it is secondary while output end with
The output end of backlight control module 220 connects, i.e. secondary output end and the backlight in input terminal and pair of the second optical coupled switch SU2B
Device connection.
In one embodiment, referring to fig. 4 and Fig. 5, judging unit 221 include: transport and placing device SU1B, the tenth resistance R10, third
Capacitor C3 and the 4th capacitor C4.
The normal phase input end of transport and placing device SU1B is connect with the second voltage end of judging unit 221, the negative of transport and placing device SU1B
Input terminal is connect with the input terminal of judging unit 221, and the output end of transport and placing device SU1B is connect with the output end of judging unit 221,
The power positive end of transport and placing device SU1B is connect with the first voltage end of judging unit 221, the power supply negative terminal ground connection of transport and placing device SU1B.
The first end of third capacitor C3 is connect with the negative-phase input of transport and placing device SU1B, the second end and fortune of third capacitor C3
Put the output end connection of device SU1B；The first end of tenth resistance R10 is connect with the negative-phase input of transport and placing device SU1B, the tenth resistance
The second end of R10 is connect by the 4th capacitor C4 with the output end of transport and placing device SU1B.
Specifically, the power positive end reception+12V power supply power supply of transport and placing device SU1B, the normal phase input end of transport and placing device SU1B connect
The predeterminated voltage VREF of preset reference power supply is received, the second optical coupled switch SU2B reception+12V power supply power supply is simultaneously connected, at this time power supply
Sequential control circuit 100 is powered to back lighting device and pfc circuit, pfc circuit work.Due to delay unit 211, driving voltage is big
Invalid signals are exported in the output end of predeterminated voltage VREF, transport and placing device SU1B, back lighting device does not work；It is less than in driving voltage pre-
If when voltage VREF, the output end of transport and placing device SU1B realizes pfc circuit and first works to back lighting device output drive signal, after
Start back lighting device, avoids current over pulse, high reliablity.
In one embodiment, referring to Fig. 5, soft starting circuit 200 further include: resistance R11, resistance Ra1, resistance Ra2, resistance
Ra3, resistance Ra4, resistance Ra5 and diode SD3.
The first end of resistance R11 is connect with the input terminal of backlight control module 220, the second end of resistance R11 respectively with back
Optical Sampling end (LED-), the first end of resistance Ra1, the first end of resistance Ra2, the first end of resistance Ra3, resistance Ra4 first
The anode connection at end, the first end of resistance Ra5 and diode SD3, the second end of resistance Ra1, the second end of resistance Ra2, resistance
The second end of Ra3, the second end of resistance Ra4, the second end of resistance Ra5 and diode SD3 cathode be grounded.Backlight sampling end
(LED-) voltage sample can be carried out to back lighting device, obtains back lighting device information of voltage.
In conjunction with the particular circuit configurations of the back-light starting circuit in above-described embodiment, to the back-light starting circuit of this implementation
Working principle is illustrated, and details are as follows:
Referring to fig. 2 and Fig. 4, external control devices send driving signal VBL_CTRL.When driving signal VBL_CTRL is height
When level, the first optical coupled switch PUB conducting, power supply module 120 provides voltage PFC_VCC for pfc circuit, provides for back lighting device
Voltage LED_VCC, pfc circuit work；First delay capacitor SE1 charging simultaneously, the first isolating diode SD1 is to the first delay electricity
The voltage for holding SE1 output carries out isolation and exports first voltage to backlight control module 220；When driving signal VBL_CTRL is low
When level, the first bleeder resistance SR1, the second bleeder resistance SR2 and the second isolating diode SD2 are rapidly by the first delay capacitor
The upper voltage of SE1 is released.
When driving signal VBL_CTRL is high level, such as the voltage of driving signal VBL_CTRL is 3.3V, and first prolongs
When capacitor SE1 charge and export first voltage, first voltage is defeated by the negative of the first from isolating diode SD1 to transport and placing device SU1B
Enter end input driving voltage, at this moment the voltage of the negative-phase input of transport and placing device SU1B is greater than the predeterminated voltage of normal phase input end
The output end of VREF, transport and placing device SU1B export low level, and as invalid signals, back lighting device does not work；With the first delay electricity
Hold the rising of SE1 both end voltage, the negative-phase input voltage of transport and placing device SU1B is gradually reduced, until being less than the pre- of normal phase input end
If voltage VREF, the output end of transport and placing device SU1B exports high level (driving signal), the second optical coupled switch SU2B reception at this time+
12V voltage turn-on drives back lighting device work according to driving signal.
In above-described embodiment, power supply sequencing control circuit can provide voltage simultaneously for back lighting device and pfc circuit, and existing
The circuit element of some power supply sequencing control circuits is few, at low cost；Predeterminated voltage and drive are judged by passing through in soft starting circuit
Whether the relationship driving back lighting device of dynamic voltage works, i.e., when the driving voltage is greater than the predeterminated voltage, back lighting device is not
Work, the backlight control module driving back lighting device work when the driving voltage is less than the predeterminated voltage, passes through default electricity
Pressure and the relationship of driving voltage accurately control the starting time of back lighting device, provide soft start for back lighting device, have reached PFC
The requirement that circuit first works, works after back lighting device avoids current over pulse, high reliablity.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (9)
1. a kind of back-light starting circuit, including power supply sequencing control circuit and soft starting circuit, the power supply sequencing control circuit
It is adapted to connect with external control devices and back lighting device with the soft starting circuit, the power supply sequencing control circuit is further adapted for
Connect with PFC pfc circuit, which is characterized in that the power supply sequencing control circuit include: energy supply control module and
Power supply module；
The energy supply control module is connect with the power supply module, in the driving signal for receiving the external control devices
When to the power supply module send power supply Continuity signal；
The power supply module is used to power when receiving the power supply Continuity signal for back lighting device and pfc circuit, so that PFC is electric
Road work；
The soft starting circuit includes: time delay module and backlight control module；
The time delay module is connect with the backlight control module, is used for when receiving the driving signal to the backlight control
Molding block outputting drive voltage；
The backlight control module is suitable for connecting with preset reference power supply, for receiving the pre- of the preset reference power input
If voltage, the back lighting device is driven to work when the driving voltage is less than the predeterminated voltage.
2. back-light starting circuit as described in claim 1, which is characterized in that the energy supply control module includes: input terminal, defeated
Outlet, first resistor, second resistance, 3rd resistor, first capacitor, the first triode and the first optical coupled switch；
The input terminal of the energy supply control module is connect with the external control devices, the output end of the energy supply control module with
The power supply module connection；
The base stage of first triode is connect by the first resistor with the input terminal of the energy supply control module, and described
The base stage of one triode is also connect by the second resistance with the emitter of first triode, first triode
Emitter ground connection, the collector of first triode are connect with the primary side output end of first optical coupled switch, and described first
Capacitor is in parallel with the second resistance；
The primary side input terminal of first optical coupled switch is connect by the 3rd resistor with the first power supply, and first optocoupler is opened
The secondary of pass connects in input terminal with the output end of output end described energy supply control module when pair.
3. back-light starting circuit as claimed in claim 2, which is characterized in that the power supply module includes: input terminal, output
End, the 4th resistance, the 5th resistance, the 6th resistance, the second capacitor, the second triode, first diode and zener diode；
The input terminal of the power supply module is connect with the output end of the energy supply control module, the output end point of the power supply module
It is not connect with the back lighting device and the pfc circuit；
The base stage of second triode yin with the secondary side output end of first optical coupled switch, the zener diode respectively
Pole, the 5th resistance first end connected with the first end of second capacitor, the emitter of second triode and institute
State the anode connection of first diode, the collector of second triode respectively with external power supply, the first diode
Cathode is connected with the first end of the 4th resistance；
The second end of 4th resistance is connect with the secondary side input terminal of first optical coupled switch；The sun of the zener diode
The second end of pole, the second end of the 5th resistance and second capacitor is grounded；
The anode of the first diode is suitable for connecting with the pfc circuit, is also suitable for and the back by the 6th resistance
Electro-optical device connection.
4. back-light starting circuit as described in claim 1, which is characterized in that the time delay module includes: input terminal, output
End, delay unit, isolated location and vent unit；
The input terminal of the time delay module is connect with the external control devices, the output end of the time delay module and the backlight
Control module connection；
The delay unit, input terminal are connect with the input terminal of the time delay module, the input of output end and the isolated location
End connect with the input terminal of the vent unit, for exporting the according to driving signal charging, and to the isolated location
One voltage；
The isolated location, output end are connect with the output end of the time delay module, for the first voltage to be isolated
The driving voltage is exported to the backlight control module；
The vent unit, output end are connect with the input terminal of the isolated location, for being low level in the driving signal
When, the voltage that the delay unit stores is released.
5. back-light starting circuit as claimed in claim 4, which is characterized in that the delay unit includes: the first delay capacitor；
First delay capacitor anode connect with the input terminal of the delay unit, the cathode of first delay capacitor and
The output end of the delay unit connects.
6. back-light starting circuit as claimed in claim 4, which is characterized in that the isolated location includes: two pole of the first isolation
Pipe；
The anode of first isolating diode is connect with the input terminal of the isolated location, and first isolating diode is born
Pole is connect with the output end of the isolated location.
7. back-light starting circuit as claimed in claim 4, which is characterized in that the vent unit include: the first bleeder resistance,
Second bleeder resistance and the second isolating diode；
The first end of first bleeder resistance is connect with the input terminal of the vent unit, and the second of first bleeder resistance
End is connect with the first end of second bleeder resistance；
The second end of second bleeder resistance is connect with the anode of second isolating diode；
The cathode of second isolating diode is connect with the output end of the vent unit.
8. back-light starting circuit as described in any one of claim 1 to 7, which is characterized in that the backlight control module includes:
Input, output end, judging unit, the second optical coupled switch, the 7th resistance, the 8th resistance and the 9th resistance；
The input terminal of the backlight control module is connect with the time delay module, the output end of the backlight control module with it is described
Back lighting device connection, the input terminal of the judging unit are connect with the input terminal of the backlight control module, the judging unit
First voltage end connect with external power supply, the second voltage end of the judging unit is connect with the preset reference power supply, institute
The output end for stating judging unit is connect by the 9th resistance with the primary side output end of second optical coupled switch；The judgement
Unit is used for the size of the driving voltage and the predeterminated voltage；
The primary side input terminal of second optical coupled switch is connect by the 7th resistance with external power supply, the 8th resistance and
The primary side of second optical coupled switch is in parallel；Second optical coupled switch it is secondary in input terminal and it is secondary while output end with the back
The output end of photocontrol module connects.
9. back-light starting circuit as claimed in claim 8, which is characterized in that the judging unit includes: transport and placing device, the tenth electricity
Resistance, third capacitor and the 4th capacitor；
The normal phase input end of the transport and placing device is connect with the second voltage end of the judging unit, the negative input of the transport and placing device
End is connect with the input terminal of the judging unit, and the output end of the transport and placing device is connect with the output end of the judging unit, institute
The power positive end for stating transport and placing device is connect with the first voltage end of the judging unit, the power supply negative terminal ground connection of the transport and placing device；
The first end of the third capacitor is connect with the negative-phase input of the transport and placing device, the second end of the third capacitor and institute
State the output end connection of transport and placing device；The first end of tenth resistance is connect with the negative-phase input of the transport and placing device, and described
The second end of ten resistance is connect by the 4th capacitor with the output end of the transport and placing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811140339.6A CN109587423B (en) | 2018-09-28 | 2018-09-28 | Backlight starting circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811140339.6A CN109587423B (en) | 2018-09-28 | 2018-09-28 | Backlight starting circuit |
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| CN109587423A true CN109587423A (en) | 2019-04-05 |
| CN109587423B CN109587423B (en) | 2023-11-21 |
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| CN112185305A (en) * | 2019-07-04 | 2021-01-05 | 京东方科技集团股份有限公司 | Backlight control device, backlight control method and display device |
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| Publication number | Publication date |
|---|---|
| CN109587423B (en) | 2023-11-21 |
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