CN109727564A - Display device and Zenith tracking method - Google Patents
Display device and Zenith tracking method Download PDFInfo
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- CN109727564A CN109727564A CN201910171476.4A CN201910171476A CN109727564A CN 109727564 A CN109727564 A CN 109727564A CN 201910171476 A CN201910171476 A CN 201910171476A CN 109727564 A CN109727564 A CN 109727564A
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- circuit
- voltage
- pfc
- display device
- resistance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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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
Abstract
The present invention provides a kind of display device and Zenith tracking method, including circuit board；It include: feed circuit, overvoltage crowbar and functional circuit on circuit board；Feed circuit is used to determine the voltage of feedback end according to the output voltage of the output end of functional circuit；Overvoltage crowbar be used for by Zenith tracking end indication output end from overvoltage indication end to functional circuit output voltage；Functional circuit is used for after display device enters the preset time period after working condition, and when Zenith tracking end detects the output end voltage of functional circuit greater than default operating voltage, control function circuit stops working.Overvoltage crowbar and functional circuit can play the role of overvoltage protection when feed circuit occurs abnormal.
Description
Technical field
The present invention relates to technical field of electronic equipment more particularly to a kind of display devices and Zenith tracking method.
Background technique
With the development of science and technology and the growing demand of user, the electrical equipment in user family is more and more, for
Family provides comprehensive convenience and amusement.Domestic electric appliance generally includes power module, and power module is for mentioning power grid
The AC power source of confession is converted to DC power supply.In power supply conversion process, current harmonics can be generated, current harmonics injects power grid will
Interference can be generated to power grid, influence other electrical equipments in power grid.With the extensive use of various domestic electric appliances, electric current
Harmonic wave becomes increasingly conspicuous to the interference problem of power grid.
Currently, domestic electric appliance inhibits current harmonics interference to generally use increases Active PFC in the power module
The method of (Power Faction Correction, PFC) circuit.The main function of pfc circuit is to allow voltage and electric current
Phase is identical, so that load be made to be similar to resistive, to improve effective power, reduces current harmonics interference；It simultaneously can also
Stable DC source signal is provided to electrical equipment.Feedback control loop is provided in power module, for providing to electrical equipment
Stable DC source signal.Feedback control loop is used to the voltage signal that power module exports feeding back to pfc circuit, pfc circuit
The voltage signal of power module output is adjusted according to the voltage signal of feedback, thus the voltage signal of stabilized power supply module output.
Wherein, the feedback factor between the voltage signal of voltage signal and the power module output of feedback depends on the device on feedback control loop
The parameter of part.
But when feedback control loop occurs abnormal, such as the resistance value of the device on feedback control loop changes, for power supply
The same voltage signal of module output, abnormal feedback control loop feedback to voltage signal provided by pfc circuit and normally
Voltage signal provided by loop is different.At this point, output electricity of the pfc circuit still according to abnormal voltage signal adjustment pfc circuit
Pressure, so that the voltage stabilization of the feedback end of pfc circuit is in predetermined reference voltage.Therefore, when the feedback of pfc circuit under abnormal conditions
When the voltage at end is consistent with predetermined reference voltage, the output voltage of pfc circuit can not be stablized in normal operating voltage, and pole has
It can exceed that normal operating voltage, it is possible that safety failure.
Summary of the invention
The embodiment of the present invention provides a kind of display device and Zenith tracking method, anti-in existing display device for solving
When presenting loop appearance exception, it is possible that the problem of safety failure.
On the one hand it includes circuit board that the embodiment of the present invention provides a kind of display device, includes: feedback electricity on the circuit board
Road, overvoltage crowbar and functional circuit；Wherein,
The output end of the functional circuit respectively with the first end of the feed circuit, the overvoltage crowbar first
End connection, the second end of the feed circuit are connect with the feedback end of the functional circuit, and the second of the overvoltage crowbar
End ground connection, the Zenith tracking end of the functional circuit is connect with the overvoltage indication end of the overvoltage crowbar；
The feed circuit determines the electricity of the feedback end for the output voltage according to the output end of the functional circuit
Pressure；
The overvoltage crowbar, for by the overvoltage indication end to the Zenith tracking end of the functional circuit
Indicate the output voltage of the output end；
The functional circuit, for the output voltage by adjusting the functional circuit, so that the voltage of the feedback end
It is consistent with predetermined reference voltage；When the voltage of the feedback end is consistent with predetermined reference voltage, the output of the functional circuit
Voltage is default operating voltage；
The functional circuit is also used to after the display device enters the preset time period after working condition, in institute
State Zenith tracking end detect the functional circuit output voltage be greater than the default operating voltage when, control the function
Circuit stops working.
In a kind of possible implementation, the control terminal of the control terminal of the functional circuit and the overvoltage crowbar connects
It connects, for controlling the working condition of the overvoltage crowbar；
The functional circuit is also used to control the overvoltage crowbar when the display device is in standby
Stop carrying out overvoltage protection to the output end of the functional circuit.
In a kind of possible implementation, when the display device is in standby, the functional circuit is specifically used
In the control terminal of Xiang Suoshu overvoltage crowbar provides the driving signal that duty ratio is less than default duty ratio, or, stopping to described
The control terminal of overvoltage crowbar provides driving signal.
In a kind of possible implementation, the overvoltage crowbar includes: first resistor, second resistance and switch；
The first end of the first resistor is connect with the output end of the functional circuit, the second end of the first resistor with
The first end of the switch connects, the second end of the switch respectively with the Zenith tracking end of the functional circuit, described the
The first end of two resistance connects, and the control terminal of the switch is connect with the control terminal of the functional circuit, the second resistance
Second end ground connection；
When the display device is in standby, the functional circuit provides duty ratio to the control terminal of the switch
Less than the driving signal of default duty ratio, or, stopping providing driving signal to the control terminal of the switch.
In a kind of possible implementation, the overvoltage crowbar further include: 3rd resistor and first capacitor；
The control terminal of the switch is also connect with the first end of the 3rd resistor and the first capacitor respectively, and described
The second end of three resistance and first capacitor ground connection.
In a kind of possible implementation, the switch is triode or metal-oxide-semiconductor.
In a kind of possible implementation, the feed circuit includes: the 4th resistance and the 5th resistance；
The first end of 4th resistance is connect with the output end of the functional circuit, the second end point of the 4th resistance
It is not connect with the feedback end of the first end of the 5th resistance, the functional circuit, the second end ground connection of the 5th resistance；
The feed circuit, for resistance value, the resistance value and the function of the 5th resistance according to the 4th resistance
The output voltage of circuit determines the voltage of the feedback end；
When the resistance value of the 4th resistance and/or the 5th resistance changes, when the functional circuit passes through tune
The output voltage of the whole functional circuit, when so that the voltage of the feedback end is consistent with predetermined reference voltage, the function electricity
The output voltage on road and the default operating voltage are inconsistent.
In a kind of possible implementation, the feed circuit further include: the second capacitor with the 5th resistor coupled in parallel；
The feed circuit is specifically used for, according to the resistance value of the 4th resistance, the resistance value of the 5th resistance, described
The output voltage of the resistance value of two capacitors and the functional circuit determines the voltage of the feedback end.
In a kind of possible implementation, the functional circuit is PFC component, and the PFC component includes power factor school
Positive pfc circuit；
The output end of the PFC component respectively with the first end of the feed circuit, the overvoltage crowbar first
End connection, the second end of the feed circuit are connect with the feedback end of the pfc circuit, the Zenith tracking of the pfc circuit
End is connect with the overvoltage indication end of the overvoltage crowbar.
In a kind of possible implementation, the pfc circuit includes: phase detecting circuit, phase compensating circuit and frequency
Adjust circuit；
Wherein, the phase detecting circuit, which is used to detect the phase of the output voltage and output electric current of the FPC component, is
It is no consistent；
The frequency adjustment circuit, when the phase for output voltage and output electric current in the PFC component is inconsistent,
The frequency of the output voltage of the PFC component is adjusted, to slow down the output voltage of the PFC component and export the phase of electric current not
Unanimously；
The phase compensating circuit is used to stablize the output voltage of the PFC component.
In a kind of possible implementation, it further includes humorous on the circuit board that the pfc circuit, which includes PFC control chip,
Shake converter LLC chip；
The control of the control terminal and the overvoltage crowbar of the PFC control chip and/or the resonance converter chip
End connection processed.
On the other hand the embodiment of the present invention provides a kind of Zenith tracking method, be applied to display device, the display dress
It sets including pfc circuit, which comprises
Obtain the state of display device；
When the display device enters standby mode, stop carrying out overvoltage protection to the output end of the pfc circuit.
In a kind of possible implementation, the display device includes overvoltage crowbar, described to stop to the PFC electricity
The output end on road carries out overvoltage protection, comprising:
It is less than the driving signal of default duty ratio to the overvoltage crowbar output duty cycle, or, stopping to the mistake
Voltage protection circuit output drive signal.
On the basis of the realization provided in above-mentioned various aspects of the invention, it can also be further combined more to provide
It realizes.
Display device provided in an embodiment of the present invention and Zenith tracking method pass through the output end increase in functional circuit
Overvoltage crowbar, the output voltage of the output end of monitoring function circuit, and be greater than in the output end voltage of functional circuit and preset
When operating voltage, control function circuit stops working so that functional circuit can not output over-voltage, avoid display device in mistake
It works in the case where voltage, when solving the appearance exception of feed circuit caused by only feed circuit, it is possible that safety event
The problem of barrier.By the way that switch is arranged in overvoltage crowbar, the control terminal of switch and the control terminal of functional circuit are connected, thus
When display device is in standby, control switch disconnects or has lower duty ratio, to reduce overvoltage crowbar
Power consumption, and structure is simple.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Bright some embodiments for those of ordinary skill in the art without any creative labor, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the structural schematic diagram for the display equipment that the embodiment of the present invention one provides；
Fig. 2 is the structural schematic diagram of the power supply module of display equipment provided by Embodiment 2 of the present invention；
Fig. 3 is the structural schematic diagram of the PFC component for the power supply module that the embodiment of the present invention three provides；
Fig. 4 is the structural schematic diagram of the PFC component for the power supply module that the embodiment of the present invention four provides；
Fig. 5 is the structural schematic diagram of the PFC component for the power supply module that the embodiment of the present invention five provides；
Fig. 6 is the structural schematic diagram of the PFC component for the power supply module that the embodiment of the present invention six provides；
Fig. 7 is the structural schematic diagram of the PFC component for the power supply module that the embodiment of the present invention seven provides；
Fig. 8 is the structural schematic diagram of the PFC component for the power supply module that the embodiment of the present invention eight provides；
Fig. 9 is the structural schematic diagram of the PFC component for the power supply module that the embodiment of the present invention nine provides；
Figure 10 is the structural schematic diagram for the display equipment that the embodiment of the present invention ten provides；
Figure 11 is the flow diagram for the Zenith tracking method that the embodiment of the present invention one provides.
Description of symbols:
1-display screen component；2-power supply modules；3-backlight assemblies；
4-shells；5-mainboards；6-audio components；
21-ac input circuits；22-electromagnetic compatibility circuits；23-rectification circuits；
24-PFC components；25-LLC circuits；26-transformers；
27-reduction voltage circuits；241-pfc circuits；242-feed circuits；
243-adjust circuit；244-overvoltage crowbars；
245-high frequency bypass filter capacitors；246-boost inductances；
247-large capacity filter capacitors；248-control switches；
249-current detection circuits；2411-phase detecting circuits；
2412-phase compensating circuits；2413-frequency adjustment circuits.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the embodiment of the present invention, to this
Technical solution in inventive embodiments is clearly and completely described, it is clear that described embodiment is that a part of the invention is real
Example is applied, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creation
Property labour under the premise of every other embodiment obtained, shall fall within the protection scope of the present invention.
Technical solution provided by the invention is illustrated combined with specific embodiments below.These are specific below
Embodiment in, the same or similar concept or process may be repeated no more in some embodiments.
Fig. 1 is the structural schematic diagram for the display equipment that the embodiment of the present invention one provides.Fig. 1 is illustratively to show that equipment is
It is illustrated for TV.As shown in Figure 1, TV include display screen component 1, power supply module 2 (do not marked in Fig. 1, optionally,
Power supply module 2 may be provided at the A in Fig. 1), backlight assembly 3 and shell 4.Wherein, display screen component 1 is used to present to user
Picture；Backlight assembly 3 is located at the lower section of display screen component 1, and usually some optical modules for well-off brightness and divide
The uniform light source of cloth, enables display screen component 1 normally to show image；Power supply module 2 is mainly used for receiving mains supply and to city
Power supply is converted to power to backlight assembly 3；The lid of shell 4 is located on display screen component 1, to hide backlight assembly 3, power supply
The components of the display devices such as component 2 play beautiful effect.
In addition, backlight assembly 3 further includes backboard (unmarked in Fig. 1), display device further includes that mainboard 5 (does not show in Fig. 1
Out), some convex closure structures are usually stamped and formed out on backboard, mainboard 5 and power supply module 2 are fixed on convex by screw or hook
It wraps.Mainboard and power supply module 2 are all respectively equipped with interlock circuit, and execute the transmitting and control of signal.It will specifically introduce below
Related circuit arrangement on power supply module 2.
Fig. 2 is the structural schematic diagram of the power supply module of display equipment provided by Embodiment 2 of the present invention.As shown in Fig. 2, electric
Source component 2 mainly includes sequentially connected ac input circuit 21, electromagnetic compatibility (Electro Magnetic
Compatibility, EMC) circuit 22, rectification circuit 23, PFC component 24, harmonic conversion (LLC) circuit 25,26 and of transformer
Reduction voltage circuit (BUCK circuit) 27.Wherein, electromagnetic compatibility circuit 22 is used to carry out High frequency filter to the AC power source of input；Rectification
Circuit 23 inputs all-view signal for rectifying to the alternating current of input, to PFC component 24；PFC component 24 generally comprises PFC
Inductance, switching power devices and PFC control chip, mainly PFC are carried out to the AC power source of input, to LLC circuit
The stable DC bus-bar voltage (such as 380V) of 25 outputs, PFC component 24 can effectively improve the power factor of power supply, guarantee voltage
With current in phase position；LLC circuit 25 can carry out buck or boost to the DC bus-bar voltage that PFC component 24 inputs, and export
Constant voltage is to transformer 26.Optionally, LLC circuit 25 can be usually synchronous using double metal-oxide-semiconductor LLC resonant transform circuits
Rectification circuit be arranged in LLC circuit 25, circuit of synchronous rectification mainly may include transformer, controller, two metal-oxide-semiconductors and
Diode.In addition, LLC circuit 25 can also include pulse frequency adjustment (Pulse frequency modulation, PFM) electricity
The components such as road, capacitor and inductance.In general, LLC circuit 25 can export a variety of different voltages, to meet the need of load
It asks；Transformer 26 is powered by BUCK circuit 27 to display screen component 1 and backlight assembly 3.Illustratively, display equipment further includes
Audio component 6, transformer 26 are also used to power to mainboard 5 and audio component 6.
Fig. 3 is the structural schematic diagram of the PFC component for the power supply module that the embodiment of the present invention three provides.As shown in figure 3, PFC
Component 24 specifically includes that pfc circuit 241 and feed circuit 242；Wherein,
The first end of feed circuit 242 is connect with the output end of PFC component 24, second end and the PFC electricity of feed circuit 242
The feedback end on road 241 connects；
Pfc circuit 241, for adjusting the output voltage of PFC component 24 so that the voltage of the feedback end of pfc circuit 241 and
Predetermined reference voltage is consistent；When the voltage of feedback end is consistent with predetermined reference voltage, the output voltage of pfc circuit 241 is pre-
If operating voltage.
Illustratively, one end of feed circuit 242 is connect with the output end of PFC component 24, the other end and pfc circuit 241
Feedback end connection, constitute feedback control loop.Feedback control loop is used to indicate the output of the output end of PFC component 24 to pfc circuit 241
Voltage.Predetermined reference voltage Vref is stored in pfc circuit 241, by comparing feedback control loop pfc circuit 241 feedback end
The voltage and predetermined reference voltage of offer finally make the voltage of feedback end and preset to adjust the output voltage of PFC component 24
Reference voltage is consistent.So that the output voltage of PFC component 24 reaches default operating voltage, the normal work of display device ensure that
Make.
Illustratively, as shown in figure 3, PFC component 24 further includes adjusting circuit 243, the control terminal and tune of pfc circuit 241
Economize on electricity road 243 connects, and adjusts circuit 243 and receives the voltage signal that rectification circuit 23 provides.Pfc circuit 241 by control terminal to
It adjusts circuit 243 and sends driving signal, driving adjusts circuit 243 and adjusts the voltage signal received from rectification circuit 23, and will
Adjust output voltage signal of the adjusted result of circuit 243 as PFC component 24.
Illustratively, feed circuit 242 is used for the voltage stabilization of the output end of PFC component 24 in predeterminated voltage, such as
380V.Specifically, feed circuit 242 is used for the Voltage Feedback of the output end of PFC component 24 to pfc circuit 241, pfc circuit
The size for the feedback voltage signal that 241 feedback port receives depends on the parameter of the device in feed circuit 242.Such as when
When the voltage of the output end of PFC component 24 is 380V, the feedback voltage that pfc circuit 241 receives is 2.41V, then pfc circuit
Predetermined reference voltage 2.41V can be stored in 241.When the feedback voltage that pfc circuit 241 receives be greater than 2.41V, then reduce PFC
The voltage of the output end of component 24；When the feedback voltage that pfc circuit 241 receives be less than 2.41V, then improve PFC component 24
The voltage of output end；To realize the stabilization of the voltage of the output end of PFC component 24.
But when feed circuit 242 occurs abnormal, such as the parameter of the device in feed circuit 242 changes, right
In the same voltage signal of the output of the output end of PFC component 24, abnormal feed circuit 242 is provided to pfc circuit 241
Voltage signal it is different from voltage signal provided by normal feed circuit 242.At this point, pfc circuit 241 is still according to exception
Feedback voltage signal adjusts the output voltage of PFC component 24, so that feed circuit 242 is believed to voltage provided by pfc circuit 241
Number stablize in predetermined reference voltage.Therefore, when under abnormal conditions feed circuit 242 to voltage signal provided by pfc circuit 241
When consistent with predetermined reference voltage, the output voltage of PFC component 24 can not be stablized in normal operating voltage, it is most likely that super
Normal operating voltage is crossed, it is possible that safety failure.
Fig. 4 is the structural schematic diagram of the PFC component for the power supply module that the embodiment of the present invention four provides.Implement with shown in Fig. 3
Example is compared, and PFC component further includes overvoltage crowbar 244 in the present embodiment.As shown in figure 4,
The first end of overvoltage crowbar 244 is connect with the output end of PFC component 24, and the first of overvoltage crowbar 244
End ground connection, the Zenith tracking end of pfc circuit 241 is connect with the overvoltage indication end of overvoltage crowbar 244；
Overvoltage crowbar 244, for indicating PFC to the Zenith tracking end of pfc circuit 241 by overvoltage indication end
The output voltage of the output end of component 24；Pfc circuit 241 after display device enters the preset time period after working condition,
When Zenith tracking end detects the output end voltage of pfc circuit 241 greater than default operating voltage, control pfc circuit 241 stops
Only work.
When pfc circuit 241 stops working, the output end of PFC component 24 does not have output voltage.
Illustratively, as shown in figure 4, feed circuit 242 and overvoltage crowbar 244 are divided to two levels to pfc circuit 241
Output voltage carry out voltage protection.
The present embodiment PFC component 24 output end increase overvoltage crowbar 244, for by overvoltage indication end to
The output voltage of the output end of the Zenith tracking end instruction PFC component 24 of pfc circuit 241.When display device enters work shape
After state, the Zenith tracking end of pfc circuit 241 can pass through the overvoltage indication end of overvoltage crowbar 244, real-time monitoring PFC
The output voltage of the output end of component 24, and after preset time period, whether the output end voltage of detection PFC component 24 is greater than
Default operating voltage, if so, it is believed that the failure of feed circuit 242 at this time, need to control pfc circuit 241 and stop working.?
When pfc circuit 241 stops working, the driving signal of the offer of FPC circuit 241 can not be received by adjusting circuit 243, adjust circuit 243
It stops working, so that the output end of PFC component 24 does not have output voltage.
Illustratively, after preset time period can enter working condition for display device, feed circuit 242 by adjusting
The output voltage of PFC component 24, so that the voltage of the feedback end required time consistent with predetermined reference voltage.
Illustratively, pfc circuit 241 is also connect with mainboard 5, for obtaining the state of display device, can be set on mainboard 5
It is equipped with the master chip of display device.
Display device provided in an embodiment of the present invention increases overvoltage crowbar, monitoring by the output end in pfc circuit
The output voltage of the output end of PFC component, and when the output voltage of FPC component is greater than default operating voltage, control pfc circuit
Stop working so that PFC component can not output over-voltage, avoid display device and work in the case where overvoltage, solve
When only feed circuit caused by feed circuit occurs abnormal, it is possible that the problem of safety failure.
Illustratively, on the basis of the above embodiments, a kind of feasible overvoltage crowbar 244 includes two resistance structures
At bleeder circuit.Bleeder circuit one end connects the output end of PFC component 24, other end ground connection, the overvoltage of pfc circuit 241
Test side need to only be connect with the dividing point of bleeder circuit, can real-time monitoring PFC component 24 output end output circuit.PFC
Circuit 241 determines that the output voltage of current FPC component is greater than default operating voltage in the voltage of the dividing point according to bleeder circuit
When, it determines 242 failure of feed circuit, stops working at this point, adjusting circuit 243, so that FPC component does not have output voltage, also make
Overvoltage crowbar 244 is obtained to stop working.The structure of this overvoltage crowbar is simple, and cost is relatively low, can be in 242 event of feed circuit
When barrier, the overvoltage protection to PFC component is realized.
But by taking display device is television set as an example, display device is in addition to above-mentioned overvoltage condition, in no fault-free,
Including working condition, standby mode and off-mode.The working condition of display device can open television set and be watched for user
TV programme, the standby mode of display device can pass through the display function of remote controler closing television machine for user, television set
Partial function module is still powered on, and in the standby state, power supply module 2 is still in working condition.
When display device is standby mode, if the partial pressure electricity that overvoltage crowbar 244 is constituted using above-mentioned two resistance
Line structure, then since power supply module 2 is still working, the output end of PFC component still normal output voltage, so that voltage protection circuit
244 are constantly in working condition, thus there are larger power consumptions.
Illustratively, on the basis of the above embodiments, the embodiment of the present invention also provides a kind of display device.Fig. 5 is this
The structural schematic diagram of the PFC component for the power supply module that inventive embodiments five provide.Present embodiment discloses overvoltage crowbars 244
The feasible structure of another kind, as shown in figure 5, overvoltage crowbar 244 includes: first resistor R1, second resistance R2 and switch
K；
The first end of first resistor R1 is connect with the output end of PFC component 24, and the second end of first resistor R1 is with switch K's
First end connection, the second end of switch K connect with the first end of the Zenith tracking end of pfc circuit 241, second resistance R2 respectively
It connects, the control terminal of switch K is connect with the control terminal of pfc circuit 241, the second end ground connection of second resistance R2.
When display device is in standby, the switch K of the control terminal of pfc circuit 241 to overvoltage crowbar 244
Control terminal provides the driving signal that duty ratio is less than default duty ratio, or, stopping the control to the switch K of overvoltage crowbar 244
End output drive signal processed, so that switch K is disconnected.
Illustratively, when switch K is connected, first resistor R1 and second resistance R2 constitute a bleeder circuit.As switch K
When shutdown, overvoltage crowbar 244 stops working, and does not generate power consumption.When 241 control switch K of pfc circuit is according to duty ratio
When lesser driving signal turn-on and turn-off, it can make the work of overvoltage crowbar 244 under low power consumpting state.
Optionally, the switch K in the present embodiment can be controlled member, such as switch can be triode or metal-oxide-semiconductor.
Overvoltage crowbar structure provided in this embodiment is simple, and cost is relatively low, not only can be to avoid display device in mistake
It works in the case where voltage, when solving the appearance exception of feed circuit caused by only feed circuit, it is possible that safety event
The problem of barrier, simultaneously, it is thus also avoided that power wastage.
Illustratively, when pfc circuit 241 is PFC chip, the control terminal of pfc circuit 241 can be for PFC chip originally
OUT pin (driving signal output pin), so as to avoid in a display device introduce overvoltage crowbar 244 it is dedicated
Control circuit, structure is simple, reduces costs.
It is understood that PFC component 24 can also need to provide the circuit module of burning voltage in output end for other.It will
Feed circuit 242 and overvoltage crowbar 244 in the embodiment of the present invention, which are applied to those, to provide burning voltage in output end
Circuit module, it can be achieved that those circuit modules the double-deck overvoltage protection.Pass through 242 He of feed circuit in the embodiment of the present invention
The overvoltage protection for the low-power consumption that overvoltage crowbar 244 is realized can also be applied to other household electrical appliance in addition to display device
Equipment or even other power electronic equipments, various embodiments of the present invention and attached drawing only by taking PFC PFC component as an example into
Row exemplary illustration, rather than limitation of the invention.
Illustratively, as shown in figure 5, overvoltage crowbar 244 further include: 3rd resistor R3 and first capacitor C1；
The control terminal of switch K is also connect with the first end of 3rd resistor R3 and first capacitor C1 respectively, 3rd resistor R3 and
The second end of first capacitor C1 is grounded.
Display device provided in this embodiment increases 3rd resistor and first capacitor in overvoltage crowbar, can play
Filter action can provide quality higher driving signal for overvoltage crowbar.
Illustratively, based on any of the above embodiments, the embodiment of the present invention also provides a kind of display device.This reality
It applies example and discloses a kind of feasible circuit structure of feed circuit 242.
Fig. 6 is the structural schematic diagram of the PFC component for the power supply module that the embodiment of the present invention six provides.As shown in fig. 6, feedback
Circuit 242 includes: first resistor R4 and the 5th resistance R5；
The first end of first resistor R4 is connect with the output end of PFC component 24, and the second end of first resistor R4 is respectively with
The feedback end connection of the first end, pfc circuit 241 of five resistance R5, the second end ground connection of the 5th resistance R5；
Feed circuit 242, for according to the defeated of the resistance value of the 4th resistance R4, the resistance value of the 5th resistance R5 and PFC component 24
Voltage out determines and provides the voltage of the feedback end of pfc circuit 241；
When the resistance value of the 4th resistance R4 and/or the 5th resistance R5 changes, when pfc circuit 241 is by adjusting PFC group
The output voltage of part 24, so that when the voltage of feedback end is consistent with predetermined reference voltage, the output voltage of PFC component 24 and pre-
If operating voltage is inconsistent.
Illustratively, referring to such as Fig. 6, feed circuit 242 is determined according to the output voltage Vout of R4, R5 and PFC component 24
The voltage V1 of feedback end specifically uses following formula one:
V1=Vout*R5/ (R4+R5) formula one
Illustratively, pfc circuit 241 compares predetermined reference voltage Vref and V1, when Vref be greater than V1, then can determine PFC
The excessively high Vout of the output voltage of the output end of component 24, at this point, pfc circuit 241 turns down the output electricity of the output end of PFC component 24
Pressure；When Vref is less than V1, then it can determine the output voltage of the output end of PFC component 24 lower than Vout, at this point, pfc circuit 241 is adjusted
The output voltage of the output end of high PFC component 24；By repeatedly adjusting, until Vref consistent with V1.
It is understood that when the resistance value of the 4th resistance R4 and/or the 5th resistance R5 changes, pfc circuit 241
According to the output voltage of V1 and Vref adjustment PFC component 24, it will when so that V1 is consistent with Vref, the output voltage of PFC component 24
It is inconsistent with default operating voltage.
For example, the value of Vref can be set to 2.41V.When feedback control loop is normal, the 4th resistance R4 and the 5th resistance
The resistance value of R5 are as follows: R4=8800K Ω, R5=56.2K Ω.As Vout=380V, V1=380*56.2/ (8800+56.2)=
2.41V.Work as Vout=400V, when being greater than 380V, V1=2.54V, be greater than Vref makes at this point, pfc circuit 241 can turn down Vout
Vout stable is obtained in 380V.
But when feedback control loop occurs abnormal, for example, the resistance value of the 5th resistance R5 increases, become R5=80K Ω.When
When Vout=380V, V1=380*80/ (8800+80)=3.42V is greater than Vref, at this point, pfc circuit 241 can turn down Vout,
Namely in Vout stable in 380V, since exception occurs in feedback control loop, Vout stable can be lower than by pfc circuit 241 at one
The voltage value of default operating voltage.When the resistance value reduction of the 5th resistance R5, such as become R5=50K Ω.As Vout=380V,
V1=380*50/ (8800+50)=2.15V is less than Vref, at this point, pfc circuit 241 can improve Vout, namely in Vout stable
In 380V, since exception occurs in feedback control loop, pfc circuit 241 can be improved Vout at one much higher than default operating voltage
Voltage value.Thus it can increase the overvoltage crowbar 244 in such as above-described embodiment in the output end of PFC component 24, to avoid
When only feed circuit caused by feed circuit occurs abnormal, it is possible that the problem of safety failure.
When feedback control loop occurs abnormal, the overvoltage indication end of overvoltage crowbar 244 is to the excessively electric of pfc circuit 241
Press test side provide voltage signal from it is normal when it is different.When what is provided according to the overvoltage indication end of overvoltage crowbar 244
When voltage signal determines that the voltage of the output end of pfc circuit 241 is greater than default operating voltage, pfc circuit 241 can control PFC electric
Road 241 stops working, and the output end of PFC component 24 stops output voltage, to realize the overvoltage of the output end of PFC component 24
Protection.
In display device provided in this embodiment, the structure of feed circuit is simple, and cost is relatively low.
Optionally, as shown in fig. 6, feed circuit 242 further include: the second capacitor C2 in parallel with the 5th resistance R5；
Feed circuit 242 is specifically used for, according to the resistance value of the 4th resistance R4, the resistance value of the 5th resistance R5, the second capacitor C2
Resistance value and PFC component 24 output voltage, determine the voltage of feedback end.
Illustratively, the second capacitor C2 is filter capacitor, for filtering out high-frequency signal, for pfc circuit 241 provide quality compared with
High voltage signal.
Illustratively, feed circuit 242 determines feedback end according to the output voltage Vout of R4, R5, C2 and PFC component 24
Voltage V1 specifically use following formula two:
V1=Vout*RAnd/(R4+RAnd) formula two
Wherein, RAnd=R5//C2, R5//C2 indicate that R5 is in parallel with C2.
It is understood that in the 4th resistance R4, the 5th resistance R5 and the second capacitor C2 at least one of failure when,
Pfc circuit 241 adjusts the output voltage of PFC component 24 according to V1 and Vref, it will when so that V1 is consistent with Vref, PFC component
24 output voltage and default operating voltage are inconsistent.Likewise, in the 4th resistance R4, the 5th resistance R5 and the second capacitor C2
In at least one of failure when, pfc circuit 241 can control pfc circuit 241 to stop working, and the output end of PFC component 24 stops defeated
Voltage out, to realize the overvoltage protection of the output end of PFC component 24.
Display device provided in this embodiment increases by the second capacitor in a feedback circuit, can filter out the height in display device
Frequency signal can provide quality higher voltage signal for pfc circuit.
Illustratively, on the basis of the above embodiments, the embodiment of the present invention also provides a kind of display device.Fig. 7 is this
The structural schematic diagram of the PFC component for the power supply module that inventive embodiments seven provide.The present embodiment carries out the structure of pfc circuit detailed
It describes in detail bright.As shown in fig. 7, pfc circuit 241 includes: that phase detecting circuit 2411, phase compensating circuit 2412 and frequency adjust electricity
Road 2413；Wherein,
Phase detecting circuit 2411 be used for detect PFC component 24 output voltage and export electric current phase it is whether consistent；
Frequency adjustment circuit 2413 is adjusted when the phase for output voltage and output electric current in PFC component 24 is inconsistent
The frequency of the output voltage of PFC component 24 is saved, it is inconsistent to slow down the phase of output voltage and output electric current of PFC component 24；
Phase compensating circuit 2412 is used to stablize the output voltage of PFC component 24.
Illustratively, on the basis of the above embodiments, the embodiment of the present invention also provides a kind of display device.Fig. 8 is this
The structural schematic diagram of the PFC component for the power supply module that inventive embodiments eight provide.As shown in figure 8, the control of overvoltage crowbar 244
End processed is also connect with the control terminal of LLC circuit 25.
Illustratively, as shown in Fig. 8 and Fig. 2, the power supply module 2 of display device includes PFC component 24 and LLC circuit 25.
PFC component 24 and LLC circuit 25 can be integrally disposed.The driving signal that the control terminal of overvoltage crowbar 244 receives can be
The driving signal that pfc circuit 241 provides, or the driving signal that LLC circuit 25 provides.
Specifically, the control terminal of overvoltage crowbar 244 can only connect the control terminal of pfc circuit 241, alternatively, only connecting
The control terminal of LLC circuit 25.The control terminal of overvoltage crowbar 244 can be as shown in figure 8, connect 241 He of pfc circuit simultaneously
The control terminal of LLC circuit 25.
Illustratively, when display device is in running order, pfc circuit 241 and/or LLC circuit 25 pass through control terminal
Output drive signal, control switch K conducting, so that overvoltage crowbar 244 carries out over-voltage guarantor to the output end of PFC component 24
Shield.
When display device is in standby, the control terminal of pfc circuit 241 and/or LLC circuit 25 stops output driving
Signal or output duty cycle are less than the driving signal of default duty ratio, so that overvoltage crowbar 244 stops to pfc circuit
241 output end carries out overvoltage protection, to reduce power consumption in the standby state.
Based on any of the above embodiments, Fig. 9 is the PFC component for the power supply module that the embodiment of the present invention nine provides
Structural schematic diagram.As shown in figure 9, PFC component 24 further include: high frequency bypass filter capacitor 245, boost inductance 246, large capacity filter
Wave capacitor 247, control switch 248 and current detection circuit 249.
Illustratively, the high frequency bypass filter capacitor 245 in the present embodiment is connect with the output end of rectification circuit 23, is used for
The high-frequency current of the output voltage of rectification circuit 23 is filtered out, and for storing electric energy.Boost inductance 246 and high frequency bypass filtered electrical
Hold 245 connections, for keeping energy when voltage disconnects.
Illustratively, adjust circuit 243 respectively with boost inductance 246, control switch 248 and large capacity filter capacitor 247
Connection adjusts circuit 243 and ends, carry out energy storage, constitute a boosting boost circuit when control switch 248 is ended.Pass through
The duty ratio of the conducting and cut-off of control switch 248, affects the output voltage of PFC component 24.
Current detection circuit 249 can be used for realizing the function of phase detecting circuit 2411.Pfc circuit in the present embodiment
241 and control switch 248 can be used for realizing the frequency regulation function of frequency adjustment circuit 2413.
Illustratively, below by taking pfc circuit 241 is using L6562D chip as an example, to display provided in an embodiment of the present invention
The structure of power supply module in device is described in detail.
Figure 10 is the structural schematic diagram for the display equipment that the embodiment of the present invention ten provides.As shown in Figure 10, display device packet
Include filter circuit, rectification circuit 23, L6562D chip and transformer 26.
Illustratively, power supply is powered by filter circuit and rectification circuit 23 to PFC component 24.Transformer 26 is used for
It powers to other electricity consumption parts (such as display screen component 1, backlight assembly 3, mainboard 5 and audio component 6) of display device.
L6562D chip can be integrated PFC chip and LLC chip.
As shown in Figure 10, L6562D chip includes pin VCC, GND, FB, PFC DRV, PFCCS, OVP, LCS, LLC
DRV, HSGND and HSDRV.Wherein, VCC pin is connect with DC power supply, and VCC indicates DC power supply.GND pin is connected to ground.
FB pin is connect with feed circuit 242.Feed circuit 242 in Figure 10 includes resistance R890 and R809 and capacitor C886.
PFC DRV pin role, is equivalent to the driving signal output end of the pfc circuit 241 in above-described embodiment.PFC DRV
Pin is used for 244 output drive signal of overvoltage crowbar, when driving signal stopping or duty ratio are less than default duty ratio
When, overvoltage crowbar 244 stops carrying out overvoltage protection to the output voltage of PFC component 24.PFCCS pin and LSC pin are used
In the function of realizing the phase detecting circuit 2411 in above-described embodiment.OVP pin is for excessively electric with overvoltage crowbar 244
Press indication end connection.Overvoltage crowbar 244 in Figure 10 includes resistance R810 and R811, and switch V830.Switch V830
Control terminal connect with PFC DRV pin.LLC DRV pin is equally used for 244 output drive signal of overvoltage crowbar.
LLC DRV pin and HS DRV pin are used for driving transformer 26.HSGND pin with transformer 26 for connecting.
Illustratively, the adjusting circuit 243 in above-described embodiment can be the freewheeling diode in embodiment illustrated in fig. 10
D.High frequency bypass filter capacitor 245 in embodiment illustrated in fig. 9 can be the capacitor C3 in embodiment illustrated in fig. 10.Shown in Fig. 9
Boost inductance 246 in embodiment can be the inductance L in embodiment illustrated in fig. 10.Large capacity filter in embodiment illustrated in fig. 9
Wave capacitor 247 can be the capacitor C4 in embodiment illustrated in fig. 10.Control switch 248 in embodiment illustrated in fig. 9 can be figure
Switch K1 in 10 illustrated embodiments.Current detection circuit 249 in embodiment illustrated in fig. 9 can be in embodiment illustrated in fig. 10
Resistance R6.
Another aspect of the present invention also provides a kind of Zenith tracking method, is applied to display device, display device includes PFC
Circuit.Illustratively, the display device in the present embodiment can be for such as the display device in Fig. 1-10 in any embodiment.
Figure 11 is the flow diagram for the Zenith tracking method that the embodiment of the present invention one provides.As shown in figure 11, the party
Method includes:
S101, the state for obtaining display device；
S102, when display device enters standby mode, stop carrying out overvoltage protection to the output end of pfc circuit.
Illustratively, in a kind of possible implementation, display device includes overvoltage crowbar, is stopped to the PFC electricity
The output end on road carries out overvoltage protection specifically can be with, comprising:
It is less than the driving signal of default duty ratio to overvoltage crowbar output duty cycle, or, stopping to overvoltage protection electricity
Road output drive signal.
It is worth noting that, can also carry out on the basis of the realization of the invention provided in the various embodiments described above into one
Step is combined to provide more embodiments.
The method in device and previous embodiment in the present embodiment be based on the same inventive concept under two aspect,
Front is described in detail method implementation process, so those skilled in the art can be according to foregoing description clearly
The structure and implementation process of the system in this implementation are solved, in order to illustrate the succinct of book, details are not described herein again.
In several embodiments provided by the present invention, it should be understood that disclosed systems, devices and methods, it can be with
It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit
It divides, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components
It can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown or
The mutual coupling, direct-coupling or communication connection discussed can be through some interfaces, the indirect coupling of device or unit
It closes or communicates to connect, can be electrical property, mechanical or other forms.
Description and claims of this specification and term " first ", " second ", " third " " in above-mentioned attached drawing
Four " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that using in this way
Data be interchangeable under appropriate circumstances, so that the embodiments described herein can be in addition to illustrating herein or describing
Sequence other than appearance is implemented.In addition, term " includes " and " having " and their any deformation, it is intended that covering is non-exclusive
Include, for example, the process, method, system, product or equipment for containing a series of steps or units are not necessarily limited to clearly arrange
Those of out step or unit, but may include be not clearly listed or it is solid for these process, methods, product or equipment
The other step or units having.Term " includes " and "comprising", there are also it to derive statement, mean without restriction include.
Those of ordinary skill in the art will appreciate that: realize that all or part of the steps of above-mentioned each method embodiment can lead to
The relevant hardware of program instruction is crossed to complete.Program above-mentioned can be stored in a computer readable storage medium.The journey
When being executed, execution includes the steps that above-mentioned each method embodiment to sequence；And storage medium above-mentioned include: ROM, RAM, magnetic disk or
The various media that can store program code such as person's CD.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of display device, including circuit board, which is characterized in that include: feed circuit, overvoltage protection electricity on the circuit board
Road and functional circuit；Wherein,
The output end of the functional circuit connects with the first end of the feed circuit, the first end of the overvoltage crowbar respectively
It connects, the second end of the feed circuit is connect with the feedback end of the functional circuit, the second termination of the overvoltage crowbar
Ground, the Zenith tracking end of the functional circuit are connect with the overvoltage indication end of the overvoltage crowbar；
The feed circuit determines the voltage of the feedback end for the output voltage according to the output end of the functional circuit；
The overvoltage crowbar, for being indicated by the overvoltage indication end to the Zenith tracking end of the functional circuit
The output voltage of the output end；
The functional circuit, for the output voltage by adjusting the functional circuit, so that the voltage of the feedback end and pre-
If reference voltage is consistent；When the voltage of the feedback end is consistent with predetermined reference voltage, the output voltage of the functional circuit
To preset operating voltage；
The functional circuit is also used to after the display device enters the preset time period after working condition, in the mistake
When voltage detection terminal detects that the output voltage of the functional circuit is greater than the default operating voltage, the functional circuit is controlled
It stops working.
2. display device according to claim 1, which is characterized in that the control terminal of the functional circuit and the over-voltage are protected
The control terminal of protection circuit connects, for controlling the working condition of the overvoltage crowbar；
The functional circuit is also used to when the display device is in standby, and is controlled the overvoltage crowbar and is stopped
Overvoltage protection is carried out to the output end of the functional circuit.
3. display device according to claim 2, which is characterized in that when the display device is in standby, institute
It states functional circuit to be specifically used for, the control terminal of Xiang Suoshu overvoltage crowbar provides the driving letter that duty ratio is less than default duty ratio
Number, or, stopping providing driving signal to the control terminal of the overvoltage crowbar.
4. display device according to claim 1-3, which is characterized in that the overvoltage crowbar includes:
One resistance, second resistance and switch；
The first end of the first resistor is connect with the output end of the functional circuit, the second end of the first resistor with it is described
The first end of switch connects, the second end of the switch respectively with the Zenith tracking end of the functional circuit, second electricity
The first end of resistance connects, and the control terminal of the switch is connect with the control terminal of the functional circuit, and the second of the second resistance
End ground connection.
5. display device according to claim 4, which is characterized in that the overvoltage crowbar further include: 3rd resistor
And first capacitor；
The control terminal of the switch is also connect with the first end of the 3rd resistor and the first capacitor respectively, the third electricity
The second end of resistance and the first capacitor is grounded.
6. display device according to any one of claim 1-3, which is characterized in that the feed circuit includes: the 4th
Resistance and the 5th resistance；
The first end of 4th resistance is connect with the output end of the functional circuit, the second end of the 4th resistance respectively with
The feedback end connection of the first end, the functional circuit of 5th resistance, the second end ground connection of the 5th resistance；
The feed circuit, for according to the resistance value of the 4th resistance, the resistance value of the 5th resistance and the functional circuit
Output voltage, determine the voltage of the feedback end；
When the resistance value of the 4th resistance and/or the 5th resistance changes, when the functional circuit is by adjusting institute
The output voltage of functional circuit is stated, when so that the voltage of the feedback end is consistent with predetermined reference voltage, the functional circuit
Output voltage and the default operating voltage are inconsistent.
7. display device according to claim 6, which is characterized in that the feed circuit further include: with the 5th electricity
Hinder the second capacitor in parallel；
The feed circuit is specifically used for, according to the resistance value of the 4th resistance, the resistance value of the 5th resistance, second electricity
The output voltage of the resistance value of appearance and the functional circuit determines the voltage of the feedback end.
8. display device according to any one of claim 1-3, which is characterized in that the functional circuit is PFC component,
The PFC component includes PFC pfc circuit；
The output end of the PFC component connects with the first end of the feed circuit, the first end of the overvoltage crowbar respectively
Connect, the second end of the feed circuit is connect with the feedback end of the pfc circuit, the Zenith tracking end of the pfc circuit with
The overvoltage indication end of the overvoltage crowbar connects.
9. a kind of Zenith tracking method, which is characterized in that be applied to display device, the display device includes pfc circuit, institute
The method of stating includes:
Obtain the state of display device；
When the display device enters standby mode, stop carrying out overvoltage protection to the output end of the pfc circuit.
10. described to stop according to the method described in claim 9, it is characterized in that, the display device includes overvoltage crowbar
Overvoltage protection only is carried out to the output end of the pfc circuit, comprising:
It is less than the driving signal of default duty ratio to the overvoltage crowbar output duty cycle, or, stopping protecting to the over-voltage
Protection circuit output drive signal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910171476.4A CN109727564A (en) | 2019-03-07 | 2019-03-07 | Display device and Zenith tracking method |
| PCT/CN2019/120098 WO2020177399A1 (en) | 2019-03-07 | 2019-11-22 | Display apparatus and overvoltage detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910171476.4A CN109727564A (en) | 2019-03-07 | 2019-03-07 | Display device and Zenith tracking method |
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| Publication Number | Publication Date |
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| CN109727564A true CN109727564A (en) | 2019-05-07 |
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ID=66302026
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| CN201910171476.4A Pending CN109727564A (en) | 2019-03-07 | 2019-03-07 | Display device and Zenith tracking method |
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| WO (1) | WO2020177399A1 (en) |
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| WO2020177399A1 (en) * | 2019-03-07 | 2020-09-10 | 青岛海信电器股份有限公司 | Display apparatus and overvoltage detection method |
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Address after: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Applicant after: Hisense Video Technology Co., Ltd Address before: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Applicant before: HISENSE ELECTRIC Co.,Ltd. |
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