CN110085176A - A kind of power control - Google Patents
A kind of power control Download PDFInfo
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- CN110085176A CN110085176A CN201910403062.XA CN201910403062A CN110085176A CN 110085176 A CN110085176 A CN 110085176A CN 201910403062 A CN201910403062 A CN 201910403062A CN 110085176 A CN110085176 A CN 110085176A
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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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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a kind of power control, the voltage of the device provides module and connect respectively with the first end of backlight LED drive module, circuit of reversed excitation control with the first end of the first end of output feedback module and protective module；Circuit of reversed excitation control is connect with the second end of output feedback module with the first end of filtering energy-storage module, and circuit of reversed excitation control is connect with the second end at the third end of output feedback module and protective module；The second end of filtering energy-storage module is connect with the first end at the third end of protective module and driving chip power supply module respectively；Driving chip is connect with the second end of the second end of driving chip power supply module and backlight LED drive module respectively；Protective module includes the first ground terminal, and the first ground terminal is used to that the voltage at the second end for filtering energy-storage module to be pulled down to the first ground connection terminal potential when voltage provides the first voltage that module provides and is less than preset value.Device realization is when voltage provides the undertension that module provides, the effect of automatically starting power control.
Description
Technical field
The present embodiments relate to power technique fields more particularly to a kind of power controls.
Background technique
Important spare part of the TV power supply as television set provides safety guarantee for the stable operation of TV.
Currently, due to power factor correction circuit (Power Factor Correction, PFC), circuit of reversed excitation and
The topological structure of backlight LED drive circuit composition can reduce the cost of power supply product, improve output transfer efficiency and produce in power supply
It is used widely in product.
However, when pfc circuit provide voltage drop as low as to a certain degree when (such as 250V or less), backlight LED driving electricity
Transformer in road can be because causing output voltage that cannot maintain, so that the drive of driving backlight LED drive circuit after PFC under-voltage
Dynamic chip trigger protection, i.e., locked to restart, at this moment television set, which will appear, shields sound phenomenon of going out.Need user manual at this time
Reset switch can just restart power control, and bad experience can be thus brought to user.
Summary of the invention
The present invention provides a kind of power control, can be certainly to realize when voltage provides the undertension that module provides
The effect of dynamic startup power supply control device, and then promote user experience.
The embodiment of the invention provides a kind of power control, which includes: that voltage provides module, back
Light LED drive module, circuit of reversed excitation control with output feedback module and filtering energy-storage module, driving chip power supply module and
Protective module；
The voltage provides first end, the backlight that module controls with the circuit of reversed excitation respectively with exports feedback module
The first end of the first end of LED drive module and protective module connection, for controlling and exporting for the circuit of reversed excitation
Feedback module, the backlight LED drive module and the protective module provide first voltage；
The circuit of reversed excitation control is connect with the second end of output feedback module with the first end of the filtering energy-storage module,
The circuit of reversed excitation control is used to be converted to the first voltage second voltage with output feedback module, and is the filter bank
It can the module offer second voltage；
The second end of the filtering energy-storage module is supplied with the second end of the protective module and the driving chip respectively
The first end of electric module connects, and provides described for the second end of the protective module and the driving chip power supply module
Two voltages；
The second end of the driving chip power supply module and the first end of driving chip connect, and the second of the driving chip
End is connect with the second end of the backlight LED drive module；
The protective module includes the first ground terminal, and first ground terminal is used to provide what module provided when the voltage
When the first voltage is less than preset value, the voltage at the second end of the filtering energy-storage module is pulled down to the first ground terminal electricity
Position.
Further, circuit of reversed excitation control and output feedback module include third end, the circuit of reversed excitation control with
The third end of output feedback module is connect with the third end of the protective module, the circuit of reversed excitation control and output feedback module
It is also used to be converted to the first voltage tertiary voltage, and provides the tertiary voltage for the protective module；The protection
Module includes: the first partial pressure unit, the first triode, the second partial pressure unit, the second triode, the first current limiting unit, optocoupler hair
Optical diode, the second current limiting unit, the second ground terminal and third transistor；
The first end of first partial pressure unit provides module with the voltage and connect, and the second of first partial pressure unit
End is connect with second ground terminal, and the third end of first partial pressure unit is connect with the base stage of first triode；
The emitter of first triode is connect with the first end of second partial pressure unit, first triode
Collector is connect with the second end of second partial pressure unit；
The third end of second partial pressure unit controls with the circuit of reversed excitation and connect with the third end of output feedback module,
4th end of second partial pressure unit is connect with the base stage of second diode, the 5th end of second division module with
The second ground terminal connection；
The emitter of second triode is connect with second ground terminal, the collector of second triode and institute
State the first end connection of the first current limiting unit；
The second end of first current limiting unit is controlled with the circuit of reversed excitation and is connect with the third end of output feedback module,
The third end of first current limiting unit is connect with the luminous end of the optocoupler light emitting diode；
The light-receiving end of the optocoupler light emitting diode is connect with the first end of second current limiting unit；
The second end of second current limiting unit is connect with the filtering energy-storage module, the third of second current limiting unit
End is connect with first ground terminal, and the 4th end of second current limiting unit is connect with the base stage of the third transistor；
The emitter of the third transistor is connect with first ground terminal, the collector of the third transistor and institute
State filtering energy-storage module connection.
Further, first partial pressure unit includes first resistor, second resistance and 3rd resistor；
The first end of the first resistor and the voltage provide module and connect, the second end of the first resistor with it is described
The first end of second resistance connects；
The second end of the second resistance base with the first end of the 3rd resistor and first triode respectively
Pole connection；
The second end of the second resistance is connect with the first end of the 3rd resistor；
The second end of the 3rd resistor is connect with second ground terminal.
Further, first partial pressure unit further includes voltage-stabiliser tube, the first filter capacitor and first diode；
The first end of the voltage-stabiliser tube is connect with the second end of the second resistance, the second end of the voltage-stabiliser tube and second
Ground terminal connection；
The first end of first filter capacitor is connect with the second end of the second resistance, first filter capacitor
Second end is connect with second ground terminal；
The cathode of the first diode is connect with the second end of the second resistance, the anode of the first diode with
The base stage of first triode connects；
The voltage-stabiliser tube, first filter capacitor and the 3rd resistor are in parallel.
Further, second partial pressure unit includes the 4th resistance, the 5th resistance and the 6th resistance；
The first end of 4th resistance is controlled with the circuit of reversed excitation and is connect with the third end of output feedback module, described
The second end of 4th resistance is connect with the emitter of first triode；
The first end of 5th resistance is connect with the collector of first triode, the second end of the 5th resistance
It is connect respectively with the base stage of the first end of the 6th resistance and second triode；
The second end of 6th resistance is connect with second ground terminal.
Further, second partial pressure unit further includes the second filter capacitor；
The first end of second filter capacitor is connect with the second end of the 5th resistance, second filter capacitor
Second end is connect with second ground terminal；
Second filter capacitor and the 6th resistor coupled in parallel.
Further, first current limiting unit includes the 7th resistance and the 8th resistance；
The first end of 7th resistance is controlled with the circuit of reversed excitation and is connect with the third end of output feedback module, described
The second end of 7th resistance is connect with the first luminous end of the optocoupler light emitting diode；
The first end of 8th resistance is connect with the second luminous end of the optocoupler light emitting diode, the 8th resistance
Second end connect with the collector of second triode.
Further, second current limiting unit includes the 9th resistance and the tenth resistance；
The first end of 9th resistance is connect with the filtering energy-storage module, the second end of the 9th resistance with it is described
First light-receiving end of optocoupler light emitting diode connects；
The first end of tenth resistance is connect with the second light-receiving end of the optocoupler light emitting diode, the tenth resistance
Second end connect with first ground terminal.
Further, second current limiting unit further includes third filter capacitor；
The first end of the third filter capacitor is connect with the second light-receiving end of the optocoupler light emitting diode, the third
The second end of filter capacitor is connect with first ground terminal；
Tenth resistance is in parallel with the third filter capacitor.
Further, it includes: filter unit, rectification unit, Active PFC unit and storage that the voltage, which provides module,
It can unit；
The filter unit is connect with the first end of the rectification unit, for filtering out the interference signal of alternating voltage；
The second end of the rectification unit is connect with the first end of the Active PFC unit, for that will filter out interference
Alternating voltage after signal is converted to DC voltage；
The second end of the Active PFC unit is connect with the first end of the energy-storage units, is used for the direct current
Voltage carries out boosting and Active PFC, to obtain the first voltage；
The second end of the energy-storage units respectively with the first end, the described circuit of reversed excitation control and export feedback module
The connection of the first end of the first end of backlight LED drive module and the protective module, controls and is exported for the circuit of reversed excitation
Feedback module, the backlight LED drive module and the protective module provide the first voltage.
The present invention is connect by providing the first end of protective module to module with voltage, the second end and flyback of protective module
Circuit control is connect with the third end of output feedback module, and the third end of protective module and the second end of filtering energy-storage module connect
It connects, when voltage, which provides the first voltage that module provides, is less than preset value, the first ground terminal of protective module will filter energy storage mould
Voltage at the second end of block is pulled down to the first ground connection terminal potential, so that filtering energy storage module resets, and then driving chip obtains
It resets, entire power control also resets normal work, and solution causes to drive when PFC power voltage supply deficiency in the prior art
Chip locks the problem of can not restarting, and realizes the effect of automatically starting power control, and then promote user experience.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of power control provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of another power control provided in an embodiment of the present invention；
Fig. 3 is the structural schematic diagram of protective module provided in an embodiment of the present invention；
Fig. 4 is the circuit diagram of protective module provided in an embodiment of the present invention；
Fig. 5 is the structural schematic diagram of another power control provided in an embodiment of the present invention；
Fig. 6 is a kind of circuit diagram of power control provided in an embodiment of the present invention；
Fig. 7 is filter unit provided in an embodiment of the present invention, rectification unit, capability correction unit, energy-storage units, flyback electricity
The circuit diagram of road control and output feedback module and filtering energy-storage module；
Fig. 8 is the circuit diagram of driving chip power supply module provided in an embodiment of the present invention and backlight LED drive module.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
Fig. 1 is a kind of structural schematic diagram of power control provided in an embodiment of the present invention, and Fig. 2 is the embodiment of the present invention
A kind of circuit diagram of the power control provided, as depicted in figs. 1 and 2, power control include: that voltage provides module
100, circuit of reversed excitation control and output feedback module 200, backlight LED drive module 300, filtering energy-storage module 500, driving chip
Power supply module 600 and protective module 400；Voltage provides module 100 and controls respectively with circuit of reversed excitation and export feedback module 200
First end IN1, the first end IN2 of backlight LED drive module 300 and the first end IN3 connection of protective module 400, be used for
It is controlled for circuit of reversed excitation and provides the first electricity with output feedback module 200, backlight LED drive module 300 and protective module 400
Pressure；Circuit of reversed excitation control is connect with the second end OU1 of output feedback module 200 with the first end IN4 of filtering energy-storage module 500,
Circuit of reversed excitation control is used to be converted to first voltage second voltage with output feedback module 200, and is filtering energy-storage module 500
Second voltage is provided；Filter energy-storage module 500 second end OU3 respectively with the second end IN6 of protective module 400 and driving core
The first end IN7 connection of piece power supply module 600, and be the second end IN6 and driving chip power supply module of protective module 400
600 provide second voltage；The second end OU4 of driving chip power supply module 600 is connect with the first end IN8 of driving chip 700, is driven
The second end OU5 of dynamic chip 700 is connect with the second end IN9 of backlight LED drive module 300；Protective module 400 connects including first
When the first voltage of ground terminal GND1, the first ground terminal GND1 for providing module offer 100 when voltage is less than preset value, it will filter
Voltage at the second end OU3 of energy-storage module 500 is pulled down to the first ground terminal GND1 current potential.
Wherein, under normal circumstances, voltage provides module 100 and controls respectively with circuit of reversed excitation and export feedback module 200
First end IN1 is connected with the first end IN2 of backlight LED drive module 300, for controlling for circuit of reversed excitation and exporting feedback module
200 and backlight LED drive module 300 provide first voltage, first voltage for example can be 390V, circuit of reversed excitation control and output
The DC voltage that voltage provides the 390V that module 100 provides is converted into second voltage by feedback module 200, such as can be
12V, and by its second end OU1 export to filtering energy-storage module 500, filtering energy-storage module 500 by circuit of reversed excitation control with it is defeated
The second voltage that feedback module 200 provides out is stored, and can be directly then driving by driving chip power supply module 600
Chip 700 provides operating voltage.Again because the voltage at the first end IN2 of backlight LED drive module 300 is 390V, that is, carrying on the back
It is more than the minimum operating voltage of light LED drive module 300, then backlight LED drive module 300 just can work together, it is final whole
A television set will be lit.However, voltage offer module 100 controls with circuit of reversed excitation respectively and exports feedback in the present embodiment
The first end IN3 of the first end IN1 of module 200, the first end IN2 of backlight LED drive module 300 and protective module 400 connect
It connects, when voltage provides the first voltage decline that module 100 provides, circuit of reversed excitation control and the first of output feedback module 200
Voltage at end IN1, the first end IN2 of backlight LED drive module 300 and the first end IN3 of protective module 400 is also under
Drop.When voltage, which provides the first voltage that module 100 provides, drops below or equal to preset value, such as when dropping to 250V, i.e.,
When voltage at the first end IN3 of protective module 400 is 250V, protective module 400 will control the voltage at its second end IN6
It is pulled down to its first ground terminal GND1 current potential.Because filtering the second end OU3 and the second of protective module 400 of energy-storage module 500
IN6 connection is held, so the voltage at the second end OU3 of filtering energy-storage module 500 is also pulled down to the first ground terminal GND1 current potential.
Circuit of reversed excitation control at this time will detect that filtering 500 shorted to earth of energy-storage module with output feedback module 200, will close drive
Moving pulse is restarted again after short-circuit protection disappearance.If voltage offer module 100 is recovered normal at this time, circuit of reversed excitation
Control also restores normally with output feedback module 200, and filtering energy-storage module 500 resets again, then driving chip 700 also obtains
It resets, realizes restarting for entire power control.
The technical solution of the present embodiment is connect, protective module by providing the first end of protective module to module with voltage
Second end connect with the second end of filtering energy-storage module, when voltage provides first voltage that module provides less than preset value,
Voltage at the second end for filtering energy-storage module is pulled down to the first ground connection terminal potential by the first ground terminal of protective module, so that filter
Wave energy-storage module resets, and then driving chip is resetted, and entire power control also resets normal work, solves existing skill
Lead to driving chip locked the problem of can not restarting in art when PFC power voltage supply deficiency, realizes the control of automatically starting power supply
The effect of device, and then promote user experience.
Based on the above technical solution, optionally, Fig. 2 is another power supply control dress provided in an embodiment of the present invention
The structural schematic diagram set；As shown in Fig. 2, circuit of reversed excitation control includes third end OU2, circuit of reversed excitation with output feedback module 200
Control with output feedback module 200 third end OU2 connect with the third end IN5 of protective module 400, circuit of reversed excitation control with it is defeated
Feedback module 200 is also used to be converted to first voltage tertiary voltage out, and provides tertiary voltage for protective module 400.Fig. 3 is
The structural schematic diagram of protective module provided in an embodiment of the present invention, as shown in figure 3, protective module 400 includes: the first partial pressure unit
40, the first triode Q25, the second partial pressure unit 41, the second triode Q24, the first current limiting unit 42, optocoupler light emitting diode
U7, the second current limiting unit 43, the second ground terminal GND2 and third transistor Q26；The first end IN3 of first partial pressure unit 40 with
Voltage provides module 100 and connects, and the second end of the first partial pressure unit 40 is connect with the second ground terminal GND2, the first partial pressure unit 40
Third end connect with the base stage B1 of the first triode Q25；The emitter E 1 of first triode Q25 and the second partial pressure unit 41
First end connection, the collector C1 of the first triode Q25 are connect with the second end of the second partial pressure unit 41；Second partial pressure unit 41
The control of third end and circuit of reversed excitation connect with the third end OU2 for exporting feedback module 200, the 4th end of the second partial pressure unit 41
It is connect with the base stage B2 of the second diode Q24, the 5th end of the second division module 41 is connect with the second ground terminal GND2；Two or three
The emitter E 2 of pole pipe Q24 is connect with the second ground terminal GND2, the collector C2 of the second triode Q24 and the first current limiting unit 42
First end connection；Second end and the circuit of reversed excitation control of first current limiting unit 42 and the third end OU2 of output feedback module 200
Connection, the third end of the first current limiting unit 42 is connect with the luminous end of optocoupler light emitting diode U7；Optocoupler light emitting diode U7's
Light-receiving end is connect with the first end of the second current limiting unit 43；The second end of second current limiting unit 43 and filtering energy-storage module 500
Second end OU3 connection, the third end of the second current limiting unit 43 are connect with the first ground terminal GND1, and the 4th of the second current limiting unit 43 the
End is connect with the base stage B3 of third transistor Q26；The emitter of third transistor Q26 is connect with the first ground terminal GND1, third
The collector of triode Q26 is connect with the second end OU3 of filtering energy-storage module 500.
It is connect specifically, voltage provides module 100 with the first end IN3 of protective module 400, when voltage provides module 100
Voltage decline when, the voltage at the third end of the first partial pressure unit 40 can also change.Illustratively, when protective module 400
The voltage of first end IN3 when dropping to 250V, after being divided by the first partial pressure unit 40, the third end of the first partial pressure unit 40
Output voltage be 21.3V.Again because protective module 400 includes third end IN5, wherein the third end IN5 of protective module 400
It is connect with circuit of reversed excitation control with the third end OU2 of output feedback module 200.Because of circuit of reversed excitation control and output feedback module
200 are also used to be converted to first voltage tertiary voltage, and provide tertiary voltage for protective module 400, it should be noted that anti-
Excitation circuit control and the tertiary voltage of the third end OU2 output of output feedback module 200 are constant voltage, i.e. circuit of reversed excitation controls
It is defeated its third end OU2 can be controlled when the voltage that voltage provides the offer of module 100 drops to very low with output feedback module 200
Tertiary voltage out is constant voltage, illustratively, tertiary voltage 22V, so, at the third end IN5 of protective module 400
Voltage is also 22V.Because the third end of the first partial pressure unit 40 is connect with the base stage B1 of the first triode Q25；First triode
The emitter E 1 of Q25 is connect with the first end of the second partial pressure unit 41, and the partial pressure of the collector C1 of the first triode Q25 and second is single
The second end connection of member 41, so when the output voltage at the third end of the first partial pressure unit 40 is 21.3V, protective module 400
When voltage at the IN5 of third end is 22V, i.e., the voltage of the base stage B1 of the first triode Q25 is 21.3V, the first triode Q25's
The voltage of emitter E 1 be 22V when, the first triode Q25 will because of its emitter E 1 voltage it is higher than the voltage of base stage B1
0.7V and be connected.Similarly, because the 4th end of the second partial pressure unit 41 is connect with the base stage B2 of the second diode Q24, when first
When triode Q25 is connected, the base stage B2 of the second diode Q24 is also powered on conducting, so the first current limiting unit 42 passes through protection
The power supply of voltage at the third end IN5 of module 400 and generate electric current.At this point, optocoupler light emitting diode U7 is also by protection mould
The power supply of voltage at the third end IN5 of block 400 and be connected.Because of the second end of the second current limiting unit 43 and filtering energy-storage module
500 second end OU3 connection, so after the primary conducting of optocoupler light emitting diode U7, it is secondary also to pass through filtering energy storage mould
The voltage that the second end OU3 of block 500 is provided works together at once, eventually leads to the base stage B3 and collector of third transistor Q26
The voltage difference of C3 is greater than 0.7V, and third transistor Q26 conducting is started to work, and when third transistor Q26 conducting, filters energy storage mould
Voltage at the second end OU3 of block 500 will be pulled low, because third transistor Q26 has the function of partial pressure, the voltage of partial pressure is big
Generally between 0.3V to 0.7V, i.e. voltage at the second end OU3 of filtering energy-storage module 500 is existed by third transistor Q26 clamper
Between 0.3V to 0.7V, for example, by third transistor Q26 clamper in 0.6V, at this point, circuit of reversed excitation control and output feedback module
200 will detect that filtering 500 shorted to earth of energy-storage module, will close driving pulse, after short-circuit protection disappearance, again
Restart.If voltage offer module 100 is recovered normal at this time, circuit of reversed excitation control also restores just with output feedback module 200
Often, filtering energy-storage module 500 resets again, then driving chip 700 is also resetted, realizes entire power control
Restart.
Based on the above technical solution, optionally, Fig. 4 is the circuit of protective module provided in an embodiment of the present invention
Figure, as shown in figure 4, the first partial pressure unit 40 includes first resistor R94, second resistance R93 and 3rd resistor R91；First resistor
The first end of R94 provides module 100 with voltage and connect, and the second end of first resistor R94 and the first end of second resistance R93 connect
It connects；The second end of second resistance R93 is connect with the base stage B1 of the first end of 3rd resistor R91 and the first triode Q25 respectively；
The second end of 3rd resistor R91 is connect with the second ground terminal GND2.
Specifically, calculated by the resistance value of first resistor R94, second resistance R93 and 3rd resistor R91, it is exemplary
, it is calculated by the resistance value of first resistor R94, second resistance R93 and 3rd resistor R91, so that when the first partial pressure unit
When voltage at 40 first end IN3 reaches 250V, the output voltage at the third end of the first partial pressure unit 40 also reaches simultaneously
21.3V。
It should be noted that the present embodiment not to the resistance value of first resistor R94, second resistance R93 and 3rd resistor R91 into
Row is specific to be limited, and those skilled in the art can voluntarily choose first resistor R94, second resistance R93 and the according to needed for product
The resistance value of three resistance R91, according to the resistance value of first resistor R94, second resistance R93 and 3rd resistor R91 to first resistor R94's
Voltage at first end is divided, so that the first triode Q25 can be connected in the voltage at the second end of second resistance R93.
Based on the above technical solution, optionally, with continued reference to Fig. 4, the first partial pressure unit 40 further includes voltage-stabiliser tube
ZD16, the first filter capacitor C47 and first diode D30；The first end of voltage-stabiliser tube ZD16 and the second end of second resistance R93 connect
It connects, the second end of voltage-stabiliser tube ZD16 is connect with the second ground terminal GND2；The first end and second resistance of first filter capacitor C47
The second end of R93 connects, and the second end of the first filter capacitor C47 is connect with the second ground terminal GND2；The yin of first diode D30
Pole is connect with the second end of second resistance R93, and the anode of first diode D30 is connect with the base stage B1 of the first triode Q25；Surely
Pressure pipe ZD16, the first filter capacitor C47 and 3rd resistor R91 are in parallel.
Wherein, voltage-stabiliser tube ZD16 is the voltage-stabiliser tube of 30V.When it is normal voltage that voltage, which provides the voltage that module provides, example
It such as can be 390V, i.e. voltage at the first end IN3 of the first partial pressure unit 40 is 390V.Pass through first resistor R94, the second electricity
The resistance value of resistance R93 and 3rd resistor R91 divides the voltage at the voltage at the first end IN3 of the first partial pressure unit 40
Afterwards, voltage-stabiliser tube ZD16 prevents the electricity of the second end of second resistance R93 by the voltage stabilization of the second end of second resistance R93 in 30V
It presses through high and protective module 400 is damaged.But at the first end IN3 of the first partial pressure unit 40 voltage decline when,
The voltage of the second end of second resistance R93 can also decline therewith, when voltage herein drops to 30V, voltage-stabiliser tube ZD16 not work
Make.First filter capacitor C47 is for the voltage at the second end of second resistance R93 to be filtered, to filter out the first three-level
The interference signal of voltage at the base stage B1 of pipe Q25.Because the pressure voltage between the first triode Q25 base stage B1 and emitter E 1 is most
Greatly 6V, so the cathode by first diode D30 is connect with the second end of second resistance R93, the sun of first diode D30
Pole is connect with the base stage B1 of the first triode Q25, so that even if when overtension at the second end of second resistance R93, also not
First triode Q25 can be damaged, protect the first triode Q25.
Based on the above technical solution, optionally, with continued reference to the 4, second partial pressure unit 41 includes the 4th resistance
R92, the 5th resistance R90 and the 6th resistance R89；First end and the circuit of reversed excitation control of 4th resistance R92 and output feedback module
200 third end OU2 connection, the second end of the 4th resistance R92 are connect with the emitter E 1 of the first triode Q25；5th resistance
The first end of R90 is connect with the collector C1 of the first triode Q25, the second end of the 5th resistance R90 respectively with the 6th resistance R89
First end and the second triode Q24 base stage B2 connection；The second end of 6th resistance R89 and the second ground terminal GND2 connect
It connects.
Wherein, because the second end of the 4th resistance R92 is connect with the emitter E 1 of the first triode Q25, the 5th resistance R90
First end connect with the collector C1 of the first triode Q25, and because the second triode Q24 emitter E 2 with second be grounded
GND2 connection is held, so the voltage at the second end of the 5th resistance R90 makes the second triode when the first triode Q25 conducting
Q24 conducting.
Based on the above technical solution, optionally, with continued reference to Fig. 4, the second partial pressure unit 41 further includes the second filter
Wave capacitor C46；The first end of second filter capacitor C46 is connect with the second end of the 5th resistance R90, the second filter capacitor C46's
Second end is connect with the second ground terminal GND2；Second filter capacitor C46 is in parallel with the 6th resistance R89.
Wherein, the second filter capacitor C46 is for the voltage at the second end of the 5th resistance R90 to be filtered, to filter
Except the interference signal of voltage at the base stage B2 of the second triode Q24.
Based on the above technical solution, optionally, with continued reference to Fig. 4, the first current limiting unit 42 includes the 7th resistance
R96 and the 8th resistance R88；First end and the circuit of reversed excitation control of 7th resistance R96 and the third end of output feedback module 200
The second end of OU2 connection, the 7th resistance R96 is connect with the first luminous end of optocoupler light emitting diode U7；The of 8th resistance R88
One end is connect with the second luminous end of optocoupler light emitting diode U7, the collection of the second end of the 8th resistance R88 and the second triode Q24
Electrode C2 connection.
Wherein, the 7th resistance R96 and the 8th resistance R88 is used for current limliting.Pass through the 7th resistance R96's and the 8th resistance R88
Metering function, so that the voltage at optocoupler light emitting diode U7 luminous end is not too high when the second triode Q24 conducting, into
And the power supply of the voltage at the third end IN5 for making the luminous end of optocoupler light emitting diode U7 pass through protective module 400 is connected.
Based on the above technical solution, optionally, with continued reference to Fig. 4, the second current limiting unit 43 includes the 9th resistance
R95 and the tenth resistance R97；The first end of 9th resistance R95 is connect with the second end OU3 of filtering energy-storage module 500, the 9th resistance
The second end of R95 is connect with the light-receiving end of optocoupler light emitting diode U7；The first end and optocoupler light emitting diode of tenth resistance R97
The light-receiving end of U7 connects, and the second end of the tenth resistance R97 is connect with the first ground terminal GND1.
Wherein, the 9th resistance R95 and the tenth resistance R97 is used for current limliting.When the luminous end of optocoupler light emitting diode U7 is connected
Afterwards, by the metering function of the 9th resistance R95 and the tenth resistance R97, make the voltage of the light-receiving end of optocoupler light emitting diode U7 not
Can be excessively high, and then the voltage that the light-receiving end of optocoupler light emitting diode U7 is provided by the second end OU3 of filtering energy-storage module 500 is vertical
Quarter works together, and the voltage difference for eventually leading to the base stage B3 and collector C3 of third transistor Q26 is greater than 0.7V, third transistor
Q26 conducting is started to work, and when third transistor Q26 conducting, the voltage filtered at the second end OU3 of energy-storage module 500 will be by
It drags down, because third transistor Q26 has the function of partial pressure, the voltage of partial pressure is probably between 0.3V to 0.7V, i.e. filter bank
Can module 500 second end OU3 at voltage by third transistor Q26 clamper between 0.3V to 0.7V, for example, by the three or three
Pole pipe Q26 clamper is in 0.6V, at this point, circuit of reversed excitation control will detect that filtering energy-storage module 500 with output feedback module 200
Shorted to earth will close driving pulse, after short-circuit protection disappearance, restart again.If voltage provides module 100 at this time
Recovered normal, circuit of reversed excitation control also restores normally with output feedback module 200, and filtering energy-storage module 500 resets again, that
Driving chip 700 is also resetted, and restarting for entire power control is realized.
Based on the above technical solution, optionally, with continued reference to Fig. 4, the second current limiting unit 43 further includes third filter
Wave capacitor C48；The first end of third filter capacitor C48 respectively with the base stage B3 of third transistor Q26 and optocoupler light-emitting diodes
The light-receiving end of pipe U7 connects, and the second end of third filter capacitor C48 is connect with the first ground terminal GND1；Tenth resistance R97 and
Three filter capacitor C48 are in parallel.
Wherein, third filter capacitor C48 is for the voltage at the first end of the tenth resistance R97 to be filtered, to filter
Except the interference signal of voltage at the base stage B3 of third transistor Q26.
Based on the above technical solution, optionally, Fig. 5 is another power supply control dress provided in an embodiment of the present invention
The structural schematic diagram set, as shown in figure 5, it includes: filter unit 10, rectification unit 20, power factor (PF) school that voltage, which provides module 100,
Positive unit 30 and energy-storage units 40；Filter unit 10 is connect with the first end of rectification unit 20, for filtering out the dry of alternating voltage
Disturb signal；The second end of rectification unit 20 is connect with the first end of Active PFC unit 30, is used for filtering interference signals
Alternating voltage afterwards is converted to DC voltage；The second end of Active PFC unit 30 and the first end of energy-storage units 40 connect
It connects, for DC voltage to be carried out boosting and Active PFC, to obtain first voltage；The second end of energy-storage units 40 is distinguished
It is controlled and the first end 200 of output feedback module, the first end of backlight LED drive module 300 and protection mould with circuit of reversed excitation
The first end of block 400 connects, and energy-storage units 40 control for circuit of reversed excitation and export feedback module 200, backlight LED drive module
300 and protective module 400 provide first voltage.
Wherein, what national grid was provided when being powered for user is all alternating voltage, and one is had in alternating voltage
A little interference signals.And the filter unit 10 in the present embodiment provides module with external voltage and connect, for receiving external exchange
Voltage, and filter out the interference signal in this alternating voltage.Rectification unit 20 is connect with filter unit 10, for the unit that accepts filter
Alternating voltage after 10 filtering interference signals, and received voltage is converted into DC voltage and is sent to Active PFC unit
30.Active PFC unit 30 is used to carrying out DC voltage into boosting and Active PFC, to obtain first voltage, and will
First voltage is sent to energy-storage units 40.Energy-storage units 40 deposit the first voltage that Active PFC unit 30 is sent
Storage, and for circuit of reversed excitation control with export feedback module 200, backlight LED drive module 300 and protective module 400 provide the
One voltage, the first voltage stability stored by energy-storage units 40 are good.
Based on the above technical solution, optionally, Fig. 6 is a kind of power control provided in an embodiment of the present invention
Circuit diagram, Fig. 7 is filter unit provided in an embodiment of the present invention, rectification unit, capability correction unit, energy-storage units, flyback
Circuit control and output feedback module and the circuit diagram for filtering energy-storage module, as shown in Figure 6 and Figure 7, filter unit 10 includes
Plug CN, fuse F2, thermistor TH2, varistor TNR2, safety capacitor CY8, CY7, CY6, CY5, CX4 and CX3,
Resistance R33, R34, R35 and R36, common mode inductance LF3 and LF4.Wherein, the input terminal of plug CN and external voltage provide module
Connection, for receiving the alternating voltage of external voltage module offer.The first output end N of plug CN is connect with thermistor TH2,
The second output terminal L of plug CN is connect with fuse F2.Fuse F2 is for preventing damage of the excessively high voltage to filter unit.
Thermistor TH2 is for preventing dash current.Varistor TNR2 is connect with fuse F2, thermistor TH2 respectively, and being used for will
Electrostatic charge in filter unit 10 is exported, and then improves 10 antistatic capacity of filter unit.Safety capacitor CY8 and CY7
It is in parallel with varistor TNR2 after series connection, and the tie point of safety capacitor CY8 and CY7 are grounded setting, for removing except filtering is single
Common mode interference in member 10.Resistance R33 and R34 series connection, resistance R35 and R36 series connection, resistance R33 and R34 after series connection respectively with
Resistance R35 and R36 and safety capacitor CY8 and CY7 after series connection is in parallel, and resistance R33, R34, R35 and R36 are used for when safety electricity
When the charge stored in appearance CY8, CY7, CY6, CY5, CX4 and CX3 is excessive, discharge the charge that it is stored.Safety electricity
It is also in parallel with resistance R33 and R34 and resistance R35 and R36 respectively to hold CX3, for removing the DM EMI in filter unit 10.
The first end 1 of common mode inductance LF3 is connect with the first end of safety capacitor CX4, the second end 2 and safety capacitor of common mode inductance LF3
The second end of the first end of CX3, the third end 3 of common mode inductance LF3 and safety capacitor CX3, the 4th end 4 of common mode inductance LF3 with
The second end of safety capacitor CX4 connects, and common mode inductance LF3 is used to remove the common mode interference in filter unit 10, safety capacitor CX4
For removing the DM EMI in filter unit 10.It is in parallel with safety capacitor CX4 after safety capacitor CY6 and CY5 series connection, safety electricity
The tie point held between CY6 and CY5 is grounded setting, for removing the common mode interference in filter unit 10.The of common mode inductance LF4
One end 1 is connect with the second end of rectification unit 20, the second end 2 of common mode inductance LF4 and the second end of safety capacitor CX4, common mode
The third end 3 of inductance LF4 and the first end of safety capacitor CX4, the third at the 4th end 4 and rectification unit 20 of common mode inductance LF4
End connection, common mode inductance LF4 is also for removing the common mode interference in filter unit 10.
Based on the above technical solution, optionally, with continued reference to Fig. 6 and Fig. 7, rectification unit 20 includes rectifier bridge
The first end 1 of BD2 and capacitor C18, rectifier bridge BD2 are connect with the first end of capacitor C18, the second end 2 and common mode of rectifier bridge BD2
The first end 1 of inductance LF4 connects, and the third end 3 and the 4th end 4 of rectifier bridge BD2 is grounded respectively, and rectifier bridge BD2 will be for that will filter
Alternating voltage after 10 filtering interference signals of unit is converted to DC voltage.The second end of capacitor C18 is also grounded, straight for filtering out
Interference signal in galvanic electricity pressure.
Based on the above technical solution, optionally, with continued reference to Fig. 6 and Fig. 7, capability correction unit 30 includes inductance
The first end 1 of L2 and diode D12, inductance L2 are connect with the anode of diode D12, the third end 3 of inductance L2 and rectifier bridge BD2
First end 1 connect, the 4th end 4 of inductance L2 is connectionless, and the 6th end 6 of inductance L2 is grounded setting, the inductance example of inductance L2
It such as may include 220Uh, inductance L2 is used to receive the DC voltage of rectifier bridge BD2 offer, and this DC voltage is boosted
And Active PFC, to obtain first voltage, and first voltage is sent to energy-storage units 40.The cathode of diode D12 with
Energy-storage units 40 connect, and diode D12 is used to prevent the voltage ingoing power of energy-storage units 40 from correcting unit 30.
Based on the above technical solution, optionally, with continued reference to Fig. 6 and Fig. 7, energy-storage units 40 include capacitor C20
It is connect with the first end of capacitor C19, capacitor C20 with the cathode of the diode D12 in capability correction unit 30, the of capacitor C20
The ground connection setting of two ends.The first end of capacitor C19 is connect with the cathode of the diode D12 in capability correction unit 30, capacitor C19's
Second end ground connection setting.Capacitor C20 and capacitor C19 are in parallel, for storing first voltage.
Based on the above technical solution, optionally, with continued reference to Fig. 6 and Fig. 7, circuit of reversed excitation control is fed back with output
Module 200 includes transformer T1, diode D13 and D14, capacitor C21 and C22, resistance R32 and metal-oxide-semiconductor Q9.Transformer T1 packet
Primary side and secondary end are included, primary side includes first end 1, second end 2, the 4th end 4, the 5th end 5 and the 6th end 6, secondary end
Including the 7th end 7, the 8th end 8, the 9th end 9 and the tenth end 10.The first end 1 of transformer T1 is connect with energy-storage units 40, is become
The second end 2 of depressor T1 is connect with the second end 2 of metal-oxide-semiconductor Q9, and the 4th end 4 of transformer T1 is connect with the cathode of diode D14,
The 5th end 5 of transformer T1 is grounded setting, and the 6th end 6 of transformer T1 is connect with the cathode of diode D13, and the of transformer T1
Seven ends 7 and the 10th end are not connected to any device.The 8th end 8 of transformer T1 is grounded setting, the 9th end 9 and the filtering of transformer T1
Energy-storage module 500 connects.Transformer T1 is used to the first voltage that energy-storage units 40 provide being converted to second voltage and third
Voltage, wherein second voltage is by its secondary output to filtering energy-storage module 500, such as second voltage can be 12V.Third electricity
The third end IN5 that pressure passes through its primary output to protective module 400.The second end of diode D13 respectively with capacitor C21 and C22
First end connection, the second end of diode D14 connect with the first end of capacitor C21 and C22 respectively, diode D13 and D14 use
Voltage at the first end for preventing capacitor C21 and C22 enters transformer T1.The first end of capacitor C21 and C22 respectively also with guarantor
The third end IN5 of module 400 is protected, the second end of capacitor C21 and C22 are grounded setting, for storing charge, make protective module 400
Third end IN5 keep constant value, such as this steady state value is 22V.The third end 3 of metal-oxide-semiconductor Q9 and the first end of resistance R32 connect
It connects, the second end of resistance R32 is grounded setting.
Based on the above technical solution, optionally, with continued reference to Fig. 6 and Fig. 7, filtering energy-storage module 500 includes two
Pole pipe D15 and D16, capacitor C23 and C24.Wherein, diode D15 and D16 is in parallel.The anode and flyback of diode D15 and D16
Circuit control is connect with output feedback module 200, and the cathode of diode D15 is connect with the first end of capacitor C23 and C24 respectively,
The cathode of diode D16 is connect with the first end of capacitor C23 and C24 respectively.The second end of capacitor C23 and C24 are grounded respectively to be set
It sets.Diode D15 and D16 are reversed hold-off diode.Capacitor C23 and C24 are used to control circuit of reversed excitation and export feedback mould
The second voltage that block 200 provides is stored, and provides second voltage for the second end IN6 of protective module, such as this voltage can
Think 12V.
Based on the above technical solution, optionally, Fig. 8 is driving chip power supply module provided in an embodiment of the present invention
And the circuit diagram of backlight LED drive module, referring to Fig. 6 and Fig. 8, driving chip power supply module 600 includes resistance R78 and R77
And capacitor C41 and C42.The first end of resistance R78 with filtering energy-storage module 500 connect, the second end of resistance R78 respectively with electricity
Hold C41 to connect with the second end of the first end of C42 and resistance R77.The first end of resistance R77 and the third of driving chip 700
Hold VCC connection.The second end of capacitor C41 and C42 are grounded setting respectively.Capacitor C41 and C42 are used for filtering energy-storage module 500
The second voltage of offer carries out storage and filtering interference signals, and powers for driving chip 700.
Based on the above technical solution, optionally, with continued reference to Fig. 6 and Fig. 8, backlight LED drive module 300 includes
Transformer T7 and T8, zener diode ZD12, ZD13, ZD14 and ZD15, resistance R75, R76, R79, R80, R81, R82, R83,
R84, R85, R86, R87 and R88, diode D24, D25, D26, D27, D28 and D29, triode Q22 and Q23, metal-oxide-semiconductor Q20 and
Q21 and capacitor C38, C39, C40, C43, C44 and C45.Wherein, transformer T7 includes primary side and secondary end, primary side packet
Include first end 1 and the 5th end 5, secondary end includes the 7th end 7 and the 12nd end 12, and the first end 1 of transformer T7 is respectively and metal-oxide-semiconductor
The third end of Q20 and the second end connection of metal-oxide-semiconductor Q21, the 5th end 5 of transformer T7 connect with the first end of capacitor C38, becomes
The 12nd end 12 of depressor T7 is connect with the first end of capacitor C39, the 7th end 7 of the transformer T7 sun with diode D28 respectively
The connection of the cathode of pole and diode D29 provides 100 voltage for providing voltage to module and is transferred to backlight LED.Diode
The cathode of D27 is connect with the first end of capacitor C45, and the second end of capacitor C45 and the plus earth setting of diode D26 are used
It is rectified in the voltage that transformer T7 is transferred to backlight LED.The cathode of diode D28 is connect with the first end of capacitor C40,
The second end of capacitor C40 and the plus earth setting of diode D29, for transformer T7 to be transferred to the voltage of backlight LED
It is rectified.The second end of capacitor C39 is connect with the cathode of the anode of diode D27 and diode D26 respectively, capacitor C39
For capacitance.The third end of metal-oxide-semiconductor Q20 is connect with the second end of metal-oxide-semiconductor Q21, the first end of metal-oxide-semiconductor Q20 respectively with resistance
The first end of R85, R83, R87 and the cathode connection of zener diode ZD14.The second end of resistance R83, zener diode
The anode of ZD14 and the third end of triode Q22 are connect with the 4th end 4 of transformer T8 respectively.The second end of resistance R87 with
The second end of triode Q22 connects.The first end of triode Q22 is connect with the first end of resistance R76, the second end of resistance R76
And the anode of diode D25 is connect with the 5th end 5 of transformer T8 respectively.The second end of resistance R85 and the yin of diode D25
Pole connection.The third end of metal-oxide-semiconductor Q21, the second end of resistance R84, the third of the anode of zener diode ZD15, triode Q23
The second end of end and capacitor C38 are grounded setting respectively, and the effect of capacitor C38 is resonance effect.The first end of metal-oxide-semiconductor Q21 point
It is not connect with the first end of the first end of resistance R84, the cathode of zener diode ZD15, resistance R88 and resistance R86.Resistance
The second end of R88 is connect with the second end of triode Q23.The second end of resistance R86 is connect with the cathode of diode D24.Three-level
The first end of pipe Q23 is connect with the first end of resistance R75.The anode of the second end of resistance R75 and diode D24 respectively with change
The first end 1 of depressor T8 connects.Transformer T8 includes primary side and secondary end, and primary side includes first end 1, second end the 2, the 4th
End 4 and the 5th end 5, secondary end include the 7th end 7 and the 6th end 6, and the second end 2 of transformer T8 is grounded setting, transformer T8
The 7th end 7 connect with the first end of resistance R79, the magnetic core of transformer T8 transformer T8 primary side, the of transformer T8
Six ends 6 are connect with the first end of resistance R80.The second end of resistance R79 respectively with the cathode of zener diode ZD12, resistance R82
First end and capacitor C43 first end connection.The second end of resistance R80 respectively with the cathode of zener diode ZD13 and
The first end of resistance R81 connects.The second end of resistance R81, the anode of zener diode ZD13, zener diode ZD12 anode
And the second end of resistance R82 is grounded setting respectively.The second end of capacitor C43 is connect with the second end N2 of driving chip 700.Electricity
The first end for holding C44 connects with the cathode of the second end of resistance R80, the first end of resistance R81 and zener diode ZD13 respectively
It connects, the second end of capacitor C44 is connect with the first end N1 of driving chip 700.Because driving chip 700 is the driving of backlight LED
IC, with continued reference to Fig. 6, driving chip 700 is located at the secondary of transformer T7 and T8, and the driving pulse of IC passes through driving transformer T8
To drive primary metal-oxide-semiconductor Q20 and Q21 to realize the transmitting of energy.Driving chip 700 is located at secondary, and it is defeated that voltage provides module 100
Voltage out is located at primary, and when voltage provides the under-voltage of module 100, the input and output gain of transformer T7 and T8 are inadequate,
Lead to 700 trigger protection of driving chip, when voltage provide module 100 provide voltage restore when, driving chip 700 do not have pair
Primary voltage provides the function that the voltage that module 100 provides is detected, the weight so driving chip 700 can not automatically reset
Open, eventually lead to it is locked, only when the driving chip power supply module 600 of driving chip 700 be filter energy-storage module 500 power supply
Restart, entire power control can just restart to work normally.The present embodiment by by the first end of protective module and electricity
Pressure provides module connection, and the second end of protective module is controlled with circuit of reversed excitation to be connect with the third end of output feedback module, protects
The third end of module is connect with the second end of filtering energy-storage module, is less than preset value when voltage provides the first voltage that module provides
When, the voltage at the second end for filtering energy-storage module is pulled down to the first ground connection terminal potential by the first ground terminal of protective module, with
Make to filter energy storage module resets, and then restart driving chip 700 when voltage provides 100 under-voltage of module, realizes again
It works on power.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The present invention is not limited to specific embodiments here, be able to carry out for a person skilled in the art it is various it is apparent variation, again
Adjustment and substitution are without departing from protection scope of the present invention.Therefore, although by above embodiments to the present invention carried out compared with
For detailed description, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, can be with
Including more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (10)
1. a kind of power control characterized by comprising voltage provides module, circuit of reversed excitation control and output feedback mould
Block, backlight LED drive module, filtering energy-storage module, driving chip power supply module and protective module；
The voltage provides module and controls respectively with the circuit of reversed excitation and the first end for exporting feedback module, the backlight LED
The connection of the first end of the first end of drive module and the protective module is fed back for controlling and exporting for the circuit of reversed excitation
Module, the backlight LED drive module and the protective module provide first voltage；
The circuit of reversed excitation control is connect with the second end of output feedback module with the first end of the filtering energy-storage module, described
Circuit of reversed excitation control is used to be converted to the first voltage second voltage with output feedback module, and is the filtering energy storage mould
Block provides the second voltage；
The second end of the filtering energy-storage module is powered with the second end of the protective module and the driving chip mould respectively
The first end of block connects, and provides second electricity for the second end of the protective module and the driving chip power supply module
Pressure；
The second end of the driving chip power supply module and the first end of driving chip connect, the second end of the driving chip with
The second end of the backlight LED drive module connects；
The protective module includes the first ground terminal, and first ground terminal is used to provide the described of module offer when the voltage
When first voltage is less than preset value, the voltage at the second end of the filtering energy-storage module is pulled down to the first ground connection terminal potential.
2. power control according to claim 1, which is characterized in that the circuit of reversed excitation control and output feedback module
Including third end, the circuit of reversed excitation control is connect with the third end of output feedback module with the third end of the protective module,
The circuit of reversed excitation control is also used to be converted to the first voltage tertiary voltage with output feedback module, and is the protection
Module provides the tertiary voltage；The protective module includes: the first partial pressure unit, the first triode, the second partial pressure unit,
Two triodes, the first current limiting unit, optocoupler light emitting diode, the second current limiting unit, the second ground terminal and third transistor；
The first end of first partial pressure unit and the voltage provide module and connects, the second end of first partial pressure unit and
The second ground terminal connection, the third end of first partial pressure unit is connect with the base stage of first triode；
The emitter of first triode is connect with the first end of second partial pressure unit, the current collection of first triode
Pole is connect with the second end of second partial pressure unit；
The third end of second partial pressure unit controls with the circuit of reversed excitation and connect with the third end of output feedback module, described
4th end of the second partial pressure unit is connect with the base stage of second triode, the 5th end of second division module with it is described
The connection of second ground terminal；
The emitter of second triode is connect with second ground terminal, the collector of second triode and described the
The first end of one current limiting unit connects；
The second end of first current limiting unit is controlled with the circuit of reversed excitation and is connect with the third end of output feedback module, described
The third end of first current limiting unit is connect with the luminous end of the optocoupler light emitting diode；
The light-receiving end of the optocoupler light emitting diode is connect with the first end of second current limiting unit；
The second end of second current limiting unit is connect with the filtering energy-storage module, the third end of second current limiting unit with
The first ground terminal connection, the 4th end of second current limiting unit is connect with the base stage of the third transistor；
The emitter of the third transistor is connect with first ground terminal, the collector of the third transistor and the filter
The connection of wave energy-storage module.
3. power control according to claim 2, which is characterized in that first partial pressure unit include first resistor,
Second resistance and 3rd resistor；
The first end of the first resistor provides module with the voltage and connect, the second end of the first resistor and described second
The first end of resistance connects；
The second end of the second resistance connects with the first end of the 3rd resistor and the base stage of first triode respectively
It connects；
The second end of the 3rd resistor is connect with second ground terminal.
4. power control according to claim 3, which is characterized in that first partial pressure unit further include voltage-stabiliser tube,
First filter capacitor and first diode；
The first end of the voltage-stabiliser tube is connect with the second end of the second resistance, the second end of the voltage-stabiliser tube and the second ground connection
End connection；
The first end of first filter capacitor is connect with the second end of the second resistance, and the second of first filter capacitor
End is connect with second ground terminal；
The cathode of the first diode is connect with the second end of the second resistance, the anode of the first diode with it is described
The base stage of first triode connects；
The voltage-stabiliser tube, first filter capacitor and the 3rd resistor are in parallel.
5. power control according to claim 2, which is characterized in that second partial pressure unit include the 4th resistance,
5th resistance and the 6th resistance；
The first end of 4th resistance is controlled with the circuit of reversed excitation and is connect with the third end of output feedback module, and the described 4th
The second end of resistance is connect with the emitter of first triode；
The first end of 5th resistance is connect with the collector of first triode, the second end difference of the 5th resistance
It is connect with the base stage of the first end of the 6th resistance and second triode；
The second end of 6th resistance is connect with second ground terminal.
6. power control according to claim 5, which is characterized in that second partial pressure unit further includes the second filtering
Capacitor；
The first end of second filter capacitor is connect with the second end of the 5th resistance, and the second of second filter capacitor
End is connect with second ground terminal；
Second filter capacitor and the 6th resistor coupled in parallel.
7. power control according to claim 2, which is characterized in that first current limiting unit include the 7th resistance and
8th resistance；
The first end of 7th resistance is controlled with the circuit of reversed excitation and is connect with the third end of output feedback module, and the described 7th
The second end of resistance is connect with the first luminous end of the optocoupler light emitting diode；
The first end of 8th resistance is connect with the second luminous end of the optocoupler light emitting diode, and the of the 8th resistance
Two ends are connect with the collector of second triode.
8. power control according to claim 2, which is characterized in that second current limiting unit include the 9th resistance and
Tenth resistance；
The first end of 9th resistance is connect with the filtering energy-storage module, the second end of the 9th resistance and the optocoupler
First light-receiving end of light emitting diode connects；
The first end of tenth resistance is connect with the second light-receiving end of the optocoupler light emitting diode, and the of the tenth resistance
Two ends are connect with first ground terminal.
9. power control according to claim 8, which is characterized in that second current limiting unit further includes third filtering
Capacitor；
The first end of the third filter capacitor is connect with the second light-receiving end of the optocoupler light emitting diode, the third filtering
The second end of capacitor is connect with first ground terminal；
Tenth resistance is in parallel with the third filter capacitor.
10. power control according to claim 1, which is characterized in that it includes: that filtering is single that the voltage, which provides module,
Member, rectification unit, Active PFC unit and energy-storage units；
The filter unit is connect with the first end of the rectification unit, for filtering out the interference signal of alternating voltage；
The second end of the rectification unit is connect with the first end of the Active PFC unit, is used for filtering interference signals
Alternating voltage afterwards is converted to DC voltage；
The second end of the Active PFC unit is connect with the first end of the energy-storage units, is used for the DC voltage
Boosting and Active PFC are carried out, to obtain the first voltage；
The second end of the energy-storage units controls first end, the backlight with output feedback module with the circuit of reversed excitation respectively
The connection of the first end of the first end of LED drive module and the protective module, controls for the circuit of reversed excitation and feeds back with output
Module, the backlight LED drive module and the protective module provide the first voltage.
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| CN201910403062.XA CN110085176B (en) | 2019-05-15 | 2019-05-15 | Power supply control device |
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| CN201910403062.XA CN110085176B (en) | 2019-05-15 | 2019-05-15 | Power supply control device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114743494A (en) * | 2022-04-27 | 2022-07-12 | 绵阳惠科光电科技有限公司 | Control circuit, driving device and display |
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