CN102169674A - Dynamic load adjusting module, liquid crystal display device and voltage adjusting method - Google Patents
Dynamic load adjusting module, liquid crystal display device and voltage adjusting method Download PDFInfo
- Publication number
- CN102169674A CN102169674A CN201110024533XA CN201110024533A CN102169674A CN 102169674 A CN102169674 A CN 102169674A CN 201110024533X A CN201110024533X A CN 201110024533XA CN 201110024533 A CN201110024533 A CN 201110024533A CN 102169674 A CN102169674 A CN 102169674A
- Authority
- CN
- China
- Prior art keywords
- voltage
- circuit
- resistance
- dynamic load
- adjusting module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000008569 process Effects 0.000 claims abstract description 22
- 230000001052 transient effect Effects 0.000 claims abstract description 11
- 230000000087 stabilizing effect Effects 0.000 claims description 13
- 238000007599 discharging Methods 0.000 abstract 3
- 238000010586 diagram Methods 0.000 description 26
- 239000004065 semiconductor Substances 0.000 description 11
- 239000000203 mixture Substances 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000002596 correlated effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000005055 memory storage Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Images
Landscapes
- Liquid Crystal Display Device Control (AREA)
Abstract
The invention provides a dynamic load adjusting module, a liquid crystal display device and a voltage adjusting method to solve the problem in the prior art that the supply voltage of an operating circuit is such high in a transient state process that an element is damaged or the service life of the element is shortened. The dynamic load adjusting module of the invention comprises a voltage acquiring circuit and a discharging circuit, wherein, the voltage acquiring circuit is connected with the power output end of the operating circuit, which is used for outputting control signal to the discharging circuit when the voltage of the power output end is greater than a preset voltage; and the discharging circuit is connected with the power output end and the voltage acquiring circuit, which is used for shunting from the power output end to reduce the voltage of the power output end when the control signal is received. By employing the technical scheme of the invention, the excessive voltage generated by the power supply can be adjusted when the operating circuit is in the transient state process of accepting power supply, thereby avoiding that the relative element is damaged or the service life of the element is shortened.
Description
Technical field
The present invention relates to technical field of liquid crystal display equipment, relate to a kind of dynamic load adjusting module and liquid crystal display and voltage adjusting method especially.
Background technology
In electronic circuit, operating circuit has transient state process usually when powering on, and for the operating circuit of some types, the high phenomenon of wafing may appear in supply voltage in this transient state process.For example, the power panel of some liquid crystal displays adopts the reverse exciting topological design, and the voltage height that wafts can appear in the LED driving power when liquid crystal display is started shooting.The reverse exciting topological structure as shown in Figure 1, Fig. 1 is the circuit diagram according to the reverse exciting topological structure of prior art.When television startup, the voltage when magnitude of voltage may raise above LED lamp bar operate as normal, thus thereby the lamp bar occurring causes the lamp bar because overvoltage and overcurrent damage or the situation of the lost of life in the moment of lighting.
Exist operating circuit supply voltage in transient state process to waft height in the prior art and cause the problem of the component wear or the lost of life, do not propose effective solution at present as yet for this problem.
Summary of the invention
Fundamental purpose of the present invention is to propose a kind of dynamic load adjusting module and liquid crystal display and voltage adjusting method, to solve that operating circuit supply voltage in transient state process in the prior art wafts height and the problem that causes the component wear or the lost of life.
For addressing the above problem, according to an aspect of the present invention, provide a kind of dynamic load adjusting module.
Dynamic load adjusting module of the present invention is used for adjusting operating circuit at the transient state process of the accepting power supply high supply voltage that wafts, described dynamic load adjusting module comprises voltage acquisition circuit and discharge circuit, wherein: described voltage acquisition circuit is connected with described power output end, when being used for voltage at described power output end greater than predeterminated voltage to described discharge circuit output control signal; Described discharge circuit is connected with described power output end and described voltage acquisition circuit, is used for shunting to reduce the voltage of described power output end from described power output end when receiving described control signal.
Further, described voltage acquisition circuit comprises bleeder circuit and output circuit, wherein: described bleeder circuit comprises voltage input end and dividing potential drop output terminal, be connected with described power output end by described voltage input end, and be connected with described output circuit by described dividing potential drop output terminal, the voltage of described dividing potential drop output terminal is less than the voltage of described power output end under described device duty; The output terminal of described output circuit is the output terminal of described voltage acquisition circuit, is connected with described discharge circuit, when described output circuit is used for voltage when described dividing potential drop output terminal greater than described predeterminated voltage, described control signal is sent to described discharge circuit.
Further, described bleeder circuit comprises first resistance and second resistance, and wherein: first end of described first resistance is described voltage input end, and second end is connected with first end of described second resistance; Second end of described second resistance is connected with the earth point of described device; The link of described first resistance and second resistance is described dividing potential drop output terminal.
Further, described output circuit comprises voltage stabilizing diode, the 3rd resistance and the 4th resistance, and wherein: first end of described voltage stabilizing diode is connected with described dividing potential drop output terminal, and second end is connected with first end of described the 3rd resistance, the 4th resistance; Second end of described the 3rd resistance is the output terminal of described output circuit; Second end of described the 4th resistance is connected with the earth point of described device.
Further, described discharge circuit comprises the 5th resistance, on-off element, electric capacity, and wherein: first end of described the 5th resistance is connected with described power output end, and second end is connected with first end of described on-off element; Second end of described on-off element is connected with first end of described electric capacity, and as the output terminal of described voltage acquisition circuit, the 3rd end is connected with the earth point of described device; Second end of described electric capacity is connected with the earth point of described device; And when described on-off element was received described control signal at its second end, its first end was communicated with the 3rd end.
Further, described on-off element comprises negative-positive-negative transistor, and its collector is as described first end, and base stage is as described second end, and emitter-base bandgap grading is as described the 3rd end.
Further, described discharge circuit comprises three ports, and wherein first port is connected with described power output end, and second port is connected with the output terminal of described voltage acquisition circuit, and the 3rd port is connected with the earth point of described device; When described the 3rd port received described control signal, described first port was communicated with described second port, makes described discharge circuit realize described shunting.
Further, described operating circuit comprises the led drive circuit of liquid crystal display.
For addressing the above problem, according to a further aspect in the invention, provide a kind of liquid crystal display.
Liquid crystal display of the present invention has dynamic load adjusting module of the present invention, the led drive circuit that described dynamic load adjusting module is used to the to adjust described liquid crystal display high supply voltage that wafts.
For addressing the above problem, according to another aspect of the invention, provide a kind of voltage adjusting method.
The method of voltage adjustment of the present invention is used for adjusting operating circuit at the transient state process of the accepting power supply high supply voltage that wafts, and described method comprises: the voltage that obtains power output end; At the voltage of power output end during greater than predeterminated voltage, from described power output end shunting to reduce the voltage of described power output end; And when returning to described predeterminated voltage, described voltage stops described shunting.
Adopt technical scheme of the present invention, the voltage of the power output end by obtaining operating circuit, generate control signal with the shunting of control according to this voltage from this power output end, wafing when high at voltage at this power output end like this can be in the effect decline low-voltage of shunting, thereby avoids the component wear or the lost of life of being correlated with.Technical scheme of the present invention can be applied to reduce the output voltage of the led drive circuit of LCD TV, and helps to protect the primary metal-oxide-semiconductor of led drive circuit.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the circuit diagram according to the reverse exciting topological structure of prior art;
Fig. 2 is the synoptic diagram according to the basic structure of the dynamic load adjusting module of the embodiment of the invention;
Fig. 3 is the synoptic diagram according to a kind of concrete structure of the voltage acquisition circuit 21 of the embodiment of the invention;
Fig. 4 is the synoptic diagram according to a kind of concrete structure of the discharge circuit of the embodiment of the invention;
Fig. 5 is the synoptic diagram according to a kind of concrete composition of the bleeder circuit of the embodiment of the invention;
Fig. 6 is the synoptic diagram according to a kind of concrete composition of the output circuit of the embodiment of the invention;
Fig. 7 is the synoptic diagram according to a kind of concrete composition of the discharge circuit of the embodiment of the invention;
Fig. 8 is the synoptic diagram according to a kind of concrete structure of the dynamic load adjusting module of the embodiment of the invention;
Fig. 9 is the synoptic diagram of LED driving voltage waveform when not adopting and adopting the dynamic load adjusting module of the embodiment of the invention in the liquid crystal display led drive circuit;
Figure 10 is the anti-synoptic diagram that swashs voltage waveform on the primary metal-oxide-semiconductor in the led drive circuit when not adopting and adopting the dynamic load adjusting module of the embodiment of the invention in the liquid crystal display led drive circuit;
Figure 11 is the synoptic diagram according to the basic structure of the liquid crystal display of the embodiment of the invention;
Figure 12 is the circuit diagram that comprises the dynamic load module in the liquid crystal display according to the embodiment of the invention; And
Figure 13 is the synoptic diagram according to the method key step of the voltage adjustment of the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is illustrated.Under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
Fig. 2 is the synoptic diagram according to the basic structure of the dynamic load adjusting module of the embodiment of the invention.
As shown in Figure 2, the dynamic load adjusting module 20 of the embodiment of the invention comprises voltage acquisition circuit 21 and discharge circuit 22 basically, this device 20 can be adjusted the operating circuit high voltage that wafts that power supply produced in the transient state process of accepting power supply, for example this operating circuit is the led drive circuit of liquid crystal display, then the power supply of this led drive circuit produces voltage and wafts when high in LED television startup process, can adopt the dynamic load adjusting module in the present embodiment.Below main be that example is made an explanation to the structure and the duty of the dynamic load adjusting module of the embodiment of the invention with the led drive circuit that is applied to liquid crystal display.
From said structure shown in Figure 2 as can be seen, the voltage of the power output end of the led drive circuit of present embodiment by obtaining LCD, generate control signal with the shunting of control according to this voltage from this power output end, wafing when high at voltage at this power output end like this can be in the effect decline low-voltage of shunting, thereby avoids the component wear or the lost of life of being correlated with.
A kind of concrete structure of voltage acquisition circuit 21 as shown in Figure 3, Fig. 3 is the synoptic diagram according to a kind of concrete structure of the voltage acquisition circuit 21 of the embodiment of the invention.In Fig. 3, voltage acquisition circuit 21 comprises bleeder circuit 211 and output circuit 212.
The output terminal 212B of output circuit 212 is the output terminal of voltage acquisition circuit 21, is connected with discharge circuit 22, when output circuit 212 is used for voltage as dividing potential drop output terminal 211B greater than above-mentioned predeterminated voltage, above-mentioned control signal is sent to discharge circuit 22.
A kind of concrete structure of discharge circuit as shown in Figure 4, Fig. 4 is the synoptic diagram according to a kind of concrete structure of the discharge circuit of the embodiment of the invention.
Can choose various circuit components according to the structure of above-mentioned bleeder circuit, output circuit and discharge circuit and realize that thereby the function of each circuit constitutes the dynamic load adjusting module among the present invention.Below be described further again for the optional concrete structure of these several circuit.
Fig. 5 is the synoptic diagram according to a kind of concrete composition of the bleeder circuit of the embodiment of the invention.
As shown in Figure 5, bleeder circuit 211 comprises the first resistance 211R1 and the second resistance 211R2, and wherein first end of the first resistance 211R1 is voltage input end 211A, and second end is connected with first end of the second resistance 211R2.Second end of the second resistance 211R2 is connected with the earth point GND of dynamic load adjusting module, and the link of the first resistance 211R1 and the second resistance 211R2 (among the figure shown in the A point) is the dividing potential drop output terminal.
Fig. 6 is the synoptic diagram according to a kind of concrete composition of the output circuit of the embodiment of the invention.
As shown in Figure 6, output circuit 212 comprises voltage stabilizing diode VD1, the 3rd resistance 212R3, the 4th resistance 212R4, wherein first end of voltage stabilizing diode VD1 is connected with dividing potential drop output terminals A point, second end is connected with first end of the 3rd resistance 212R3, the 4th resistance 212R4, second end of the 3rd resistance 212R3 is the output terminal 212B of output circuit 212, and second end of the 4th resistance 212R4 is connected with the earth point GND of dynamic load adjusting module.
Fig. 7 is the synoptic diagram according to a kind of concrete composition of the discharge circuit of the embodiment of the invention.
As shown in Figure 7, discharge circuit 22 comprises the 5th resistance 22R5, on-off element 221, electric capacity 222, and wherein first end of the 5th resistance 22R5 is connected with the power output end U of led drive circuit, and second end is connected with first end of on-off element 221; Second end of on-off element 221 is connected with first end of electric capacity 222, and is connected with the output terminal 212B of voltage acquisition circuit 21, and the 3rd end is connected with the earth point GND of dynamic load adjusting module; Second end of electric capacity 222 is connected with above-mentioned earth point.
When on-off element 221 was received above-mentioned control signal at its second end, its first end was communicated with the 3rd end.On-off element 221 can adopt various thyristors to realize, for example can be negative-positive-negative transistor, and its collector, base stage and emitter-base bandgap grading are respectively as first end, second end and the 3rd end of on-off element 221.
Adopt the concrete composition of above-mentioned bleeder circuit, output circuit and discharge circuit, can obtain a kind of concrete structure of the dynamic load adjusting module in the embodiment of the invention, as shown in Figure 8.Fig. 8 is the synoptic diagram according to a kind of concrete structure of the dynamic load adjusting module of the embodiment of the invention.Below in conjunction with Fig. 8 the circuit working process of this structure is analyzed.
The parameter of each element can be taken as respectively among Fig. 8: the resistance of the first resistance 211R1 is 440K ohm; The resistance of second resistance is 82K ohm; The voltage stabilizing value of voltage stabilizing diode is 16 volts; The resistance of the 3rd resistance 212R3 is 1K ohm; The resistance of the 4th resistance 212R4 is 10K ohm; The resistance of the 5th resistance 22R5 is 100K ohm; The capacitance of electric capacity 222 is 0.1 microfarad.On-off element 221 is chosen negative-positive-negative transistor.
If consider the heat radiation of resistive element, then the resistance of the big resistance resistance with a plurality of less resistances can be replaced, for example the first resistance 211R1 can be replaced by the resistance of two 220K ohms.
In start process, the secondary output 12V one tunnel of transformer is after the load that has increased mainboard, and band carries heavier, because the output voltage of the output voltage of 100V one tunnel and 12V one tunnel is from same transformer, thereby causes wafing on the output voltage of 100V one tunnel.When this road output voltage was 100V, action A place, set-point voltage was (the U point voltage is represented with U):
U×211R2/(211R1+211R2)＝100×82/(440+82)V＝15.71V。
This moment, 16V voltage stabilizing diode VD1 was failure to actuate; When 100V continues to waft high to 107V when above, the voltage-to-ground of point A reaches U * 211R2/ (211R1+211R2)=107 * 82/ (440+82) more than the V=16.8V, because voltage stabilizing diode VD1 meeting conducting, the base stage voltage-to-ground of triode 221 surpasses 0.7V, triode 221 beginning conducting work, collector has a certain amount of electric current to flow through, and makes resistance 22R5 go up current sinking, thereby drags down the U point voltage.
After liquid crystal display is lighted, because U voltage is given the power supply of LED lamp bar, self load increases, thereby voltage is reduced to less than making voltage stabilizing diode VD1 and triode 221 produce the voltage of action, voltage stabilizing diode VD1 and triode 221 are not worked, and do not influence the normal operation of peripheral circuits.Do not have power consumption because triode 221 is in cut-off state on the resistance 22R5 this moment.Electric current on resistance 211R1 and the resistance 211R2 is very little, and power consumption is also just very little, approaches 0 watt, so whole dynamic load adjusting module does not have power consumption basically when being failure to actuate, does not influence the power consumption of whole power panel.
When standby, the load of 12V one tunnel lightens, and U point voltage steady operation is at 100V, and the voltage at action A place, set-point does not reach 16V yet, and voltage stabilizing diode VD1 and triode 221 are not worked, and do not influence the normal operation of peripheral circuits.The same when lighting with liquid crystal display, triode 221 is in cut-off state, does not have power consumption on the resistance 22R5.Electric current on resistance 211R1 and the resistance 211R2 is very little, thereby power consumption is very little, approaches 0 watt.So whole dynamic load circuit does not have power consumption basically yet during standby, do not influence the power consumption of whole power panel.
For the dynamic load adjusting module of present embodiment, can change the parameter of above-mentioned each element when needed, thereby realize the voltage that waves is arbitrarily dragged down.The resistance that for example can adjust resistance 211R2 decides when the voltage output circuit 212 output control signals when how high of wafing, to drag down the voltage that waves.Be that voltage wafts and is above predeterminated voltage to the voltage that makes output circuit 212 produce action, and this predeterminated voltage can be to decide by the resistance of adjusting resistance 211R2.
Also can adjust the resistance of the 4th resistance 212R4, increase or reduce the base current of triode 221, thereby change the amplitude that drags down U voltage; Can also adjust the resistance of resistance 22R5 in addition, change the amplitude that drags down U voltage.In addition, resistance 211R2, resistance 212R4, resistance 22R5 can also be cooperated together and adjust, realize better effect.
Fig. 9 is the synoptic diagram of LED driving voltage waveform when not adopting and adopting the dynamic load adjusting module of the embodiment of the invention in the liquid crystal display led drive circuit.
In Fig. 9, LED driving voltage waveform when waveform 91A in square frame 91 and the square frame 92 and waveform 92A are respectively the dynamic load adjusting module that does not adopt and adopt the embodiment of the invention in the liquid crystal display led drive circuit.The point of zero voltage of waveform 91A and waveform 92A flushes, and can find out the influence of the dynamic load adjusting module of the embodiment of the invention to the LED driving voltage from Fig. 9 intuitively.
In waveform 91A, the LED driving voltage height that wafts has reached 238V in the liquid crystal display start process, is operated in 100V after liquid crystal display is lighted.
In waveform 92A, the LED driving voltage is up to 220V in the liquid crystal display start process, is operated in 100V after liquid crystal display is lighted.
Figure 10 is the anti-synoptic diagram that swashs voltage waveform on the primary metal-oxide-semiconductor in the led drive circuit when not adopting and adopting the dynamic load adjusting module of the embodiment of the invention in the liquid crystal display led drive circuit.
In Figure 10, the anti-sharp voltage waveform on the primary metal-oxide-semiconductor when waveform 101A in square frame 101 and the square frame 102 and waveform 102A are respectively the dynamic load adjusting module that does not adopt and adopt the embodiment of the invention in the liquid crystal display led drive circuit in the led drive circuit.The point of zero voltage of waveform 101A and waveform 102A flushes, and the dynamic load adjusting module that can find out the embodiment of the invention from figure intuitively is to the anti-influence that swashs voltage on the metal-oxide-semiconductor.
In waveform 101A, the anti-sharp voltage electricity on the metal-oxide-semiconductor is up to arriving 630V, near the withstand voltage upper limit of metal-oxide-semiconductor.
In waveform 102A, the anti-sharp voltage on the metal-oxide-semiconductor is 594V, significantly decreases compared with 630V, has increased the anti-surplus that swashs voltage on the metal-oxide-semiconductor thus.
With the circuit among Fig. 8 is example, and the resistance that increases resistance 211R2 can increase the value of U * 211R2/211R1, makes this dynamic load circuit just begin action at the supply voltage of led drive circuit when low; The resistance that increases resistance 212R4 can increase the base current of triode, thereby can increase the amplitude that the led drive circuit supply voltage is dragged down; The resistance that reduces resistance 22R5 can increase the power that this resistance bears, thereby increases the amplitude that drags down the led drive circuit supply voltage.
Figure 11 is the synoptic diagram according to the basic structure of the liquid crystal display of the embodiment of the invention.As shown in figure 11, comprise the power supply 113 and the dynamic load adjusting module 114 of led drive circuit 112, led drive circuit 112 in the liquid crystal display 111, the output terminal 1131 of this power supply 113 is connected with dynamic load adjusting module 114.The structure of dynamic load adjusting module 114 can adopt the structure of the dynamic load adjusting module 20 in the present embodiment, like this, wafts when high at the output voltage of power supply 113, and dynamic load adjusting module 114 can be adjusted this high voltage that wafts.
Figure 12 is the circuit diagram that comprises the dynamic load module in the liquid crystal display according to the embodiment of the invention.As shown in figure 12, the circuit in the square frame 121 is represented the dynamic load in the embodiment of the invention.After in circuit, increasing the dynamic load adjusting module of present embodiment, can realize following beneficial effect:
Realized dynamically adding to led drive circuit the function of load, promptly in the liquid crystal display start process, the work of dynamic load adjusting module was to realize the interpolation load when LED driving voltage surpassed a certain value;
Realized control that the led drive circuit supply voltage is dragged down, promptly only waft and it is dragged down when high at this voltage, thereby quit work and stop to add load and finish back dynamic load adjusting module, do not influence the output of led drive circuit at the liquid crystal display start process;
Realized reducing the anti-purpose that swashs voltage on the metal-oxide-semiconductor of the primary circuit in the led drive circuit, strengthened in the liquid crystal display start process protection of this MSO pipe has been increased the reliability of circuit.
In addition, the dynamic load adjusting module versatility in the present embodiment is stronger, can the appropriate design parameter to determine the supply voltage of the operating circuit of voltage acquisition circuit when the discharge circuit output control signal, this supply voltage is dragged down according to setting value.
Figure 13 is the synoptic diagram according to the method key step of the voltage adjustment of the embodiment of the invention.As shown in figure 13, this method mainly comprises the steps:
Step S131: the voltage that obtains power output end;
Step S133: at the voltage of power output end during greater than predeterminated voltage, from the power output end shunting to reduce the voltage of power output end.
According to above-mentioned steps, drag down supply voltage at the voltage of power output end during greater than predeterminated voltage, realized dynamic adjustment supply voltage thus, this helps to protect element in the operating circuit not to be damaged or prolongs its serviceable life.After step S133, if the voltage of power output end returns to predeterminated voltage under shunting action, then can stop this shunting, thus additive decrementation power supply electric energy not.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, carry out by calculation element thereby they can be stored in the memory storage, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. dynamic load adjusting module is used for adjusting operating circuit at the transient state process of the accepting power supply high supply voltage that wafts, and it is characterized in that described dynamic load adjusting module comprises voltage acquisition circuit and discharge circuit, wherein:
Described voltage acquisition circuit is connected with power output end, when being used for voltage at described power output end greater than predeterminated voltage to described discharge circuit output control signal;
Described discharge circuit is connected with described power output end and described voltage acquisition circuit, is used for shunting to reduce the voltage of described power output end from described power output end when receiving described control signal.
2. dynamic load adjusting module according to claim 1 is characterized in that described voltage acquisition circuit comprises bleeder circuit and output circuit, wherein:
Described bleeder circuit comprises voltage input end and dividing potential drop output terminal, be connected with described power output end by described voltage input end, and be connected with described output circuit by described dividing potential drop output terminal, the voltage of described dividing potential drop output terminal is less than the voltage of described power output end under described device duty;
The output terminal of described output circuit is the output terminal of described voltage acquisition circuit, is connected with described discharge circuit, when described output circuit is used for voltage when described dividing potential drop output terminal greater than described predeterminated voltage, described control signal is sent to described discharge circuit.
3. dynamic load adjusting module according to claim 2 is characterized in that, described bleeder circuit comprises first resistance and second resistance, wherein:
First end of described first resistance is described voltage input end, and second end is connected with first end of described second resistance;
Second end of described second resistance is connected with the earth point of described device;
The link of described first resistance and second resistance is described dividing potential drop output terminal.
4. dynamic load adjusting module according to claim 2 is characterized in that, described output circuit comprises voltage stabilizing diode, the 3rd resistance and the 4th resistance, wherein:
First end of described voltage stabilizing diode is connected with described dividing potential drop output terminal, and second end is connected with first end of described the 3rd resistance, the 4th resistance;
Second end of described the 3rd resistance is the output terminal of described output circuit;
Second end of described the 4th resistance is connected with the earth point of described device.
5. dynamic load adjusting module according to claim 4 is characterized in that described discharge circuit comprises the 5th resistance, on-off element, electric capacity, wherein:
First end of described the 5th resistance is connected with described power output end, and second end is connected with first end of described on-off element;
Second end of described on-off element is connected with first end of described electric capacity, and as the output terminal of described voltage acquisition circuit, the 3rd end is connected with the earth point of described device;
Second end of described electric capacity is connected with the earth point of described device; And,
When described on-off element was received described control signal at its second end, its first end was communicated with the 3rd end.
6. dynamic load adjusting module according to claim 5 is characterized in that described on-off element comprises negative-positive-negative transistor, and its collector is as described first end, and base stage is as described second end, and emitter-base bandgap grading is as described the 3rd end.
7. dynamic load adjusting module according to claim 1, it is characterized in that described discharge circuit comprises three ports, wherein first port is connected with described power output end, second port is connected with the output terminal of described voltage acquisition circuit, and the 3rd port is connected with the earth point of described device; When described the 3rd port received described control signal, described first port was communicated with described second port, makes described discharge circuit realize described shunting.
8. according to each described dynamic load adjusting module in the claim 1 to 7, it is characterized in that described operating circuit comprises the led drive circuit of liquid crystal display.
9. liquid crystal display, it is characterized in that, described liquid crystal display has each described dynamic load adjusting module in the claim 1 to 7, the led drive circuit that described dynamic load adjusting module is used to the to adjust described liquid crystal display high supply voltage that wafts.
10. voltage adjusting method is used for adjusting operating circuit at the transient state process of the accepting power supply high supply voltage that wafts, and it is characterized in that described method comprises:
Obtain the voltage of power output end;
At the voltage of power output end during greater than predeterminated voltage, from described power output end shunting to reduce the voltage of described power output end; And when returning to described predeterminated voltage, described voltage stops described shunting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110024533 CN102169674B (en) | 2011-01-21 | 2011-01-21 | Dynamic load adjusting module, liquid crystal display device and voltage adjusting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110024533 CN102169674B (en) | 2011-01-21 | 2011-01-21 | Dynamic load adjusting module, liquid crystal display device and voltage adjusting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102169674A true CN102169674A (en) | 2011-08-31 |
| CN102169674B CN102169674B (en) | 2013-06-05 |
Family
ID=44490818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110024533 Active CN102169674B (en) | 2011-01-21 | 2011-01-21 | Dynamic load adjusting module, liquid crystal display device and voltage adjusting method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102169674B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102523405A (en) * | 2011-12-08 | 2012-06-27 | 青岛海信电器股份有限公司 | Method for controlling power panel voltage, power panel of liquid crystal display television and liquid crystal display television |
| CN104680996A (en) * | 2015-03-10 | 2015-06-03 | 深圳市华星光电技术有限公司 | VCOM generation circuit and liquid crystal display |
| CN106532875A (en) * | 2017-01-13 | 2017-03-22 | 广东欧珀移动通信有限公司 | Mobile terminal |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007134430A (en) * | 2005-11-09 | 2007-05-31 | Sharp Corp | Led illumination apparatus, led backlight, and image display device |
| CN101313631A (en) * | 2005-11-25 | 2008-11-26 | 松下电工株式会社 | OLED driver and illuminator equipped with such driver |
| US20090187925A1 (en) * | 2008-01-17 | 2009-07-23 | Delta Electronic Inc. | Driver that efficiently regulates current in a plurality of LED strings |
| CN201576429U (en) * | 2009-07-14 | 2010-09-08 | 深圳晶辰电子科技股份有限公司 | Plasma display power supply time sequence control device |
| CN202005020U (en) * | 2011-01-21 | 2011-10-05 | 青岛海信电器股份有限公司 | Dynamic load adjustment module and liquid crystal display equipment |
-
2011
- 2011-01-21 CN CN 201110024533 patent/CN102169674B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007134430A (en) * | 2005-11-09 | 2007-05-31 | Sharp Corp | Led illumination apparatus, led backlight, and image display device |
| CN101313631A (en) * | 2005-11-25 | 2008-11-26 | 松下电工株式会社 | OLED driver and illuminator equipped with such driver |
| US20090187925A1 (en) * | 2008-01-17 | 2009-07-23 | Delta Electronic Inc. | Driver that efficiently regulates current in a plurality of LED strings |
| CN201576429U (en) * | 2009-07-14 | 2010-09-08 | 深圳晶辰电子科技股份有限公司 | Plasma display power supply time sequence control device |
| CN202005020U (en) * | 2011-01-21 | 2011-10-05 | 青岛海信电器股份有限公司 | Dynamic load adjustment module and liquid crystal display equipment |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102523405A (en) * | 2011-12-08 | 2012-06-27 | 青岛海信电器股份有限公司 | Method for controlling power panel voltage, power panel of liquid crystal display television and liquid crystal display television |
| CN102523405B (en) * | 2011-12-08 | 2014-05-07 | 青岛海信电器股份有限公司 | Method for controlling power panel voltage, power panel of liquid crystal display television and liquid crystal display television |
| CN104680996A (en) * | 2015-03-10 | 2015-06-03 | 深圳市华星光电技术有限公司 | VCOM generation circuit and liquid crystal display |
| CN106532875A (en) * | 2017-01-13 | 2017-03-22 | 广东欧珀移动通信有限公司 | Mobile terminal |
| CN106532875B (en) * | 2017-01-13 | 2019-08-06 | Oppo广东移动通信有限公司 | Mobile terminal |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102169674B (en) | 2013-06-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103326458B (en) | A kind of external power source and battery powered power supply switch circuit | |
| KR101847320B1 (en) | Led boost converter and backlight led driving device applying same | |
| CN102842893B (en) | Short-circuit protection and control circuit for LED (Lighnt emitting Diode) strip lamp | |
| CN103384436B (en) | LED-backlit constant-current circuit | |
| CN104902653A (en) | LED constant-voltage dimming power supply and LED lamp dimming system | |
| CN103401209B (en) | LED-backlit short-circuit protection circuit | |
| CN103531156B (en) | Backlight drive circuit and liquid crystal indicator | |
| CN103687240A (en) | Overvoltage and overcurrent protective circuit and electronic device | |
| CN102169674B (en) | Dynamic load adjusting module, liquid crystal display device and voltage adjusting method | |
| CN203674978U (en) | Direct-current voltage-limiting circuit, electronic equipment therewith, and temperature controller | |
| CN202856317U (en) | LED light bar short circuit protection control circuit | |
| CN105762854A (en) | Battery power supply circuit and power supply method thereof | |
| CN101771404B (en) | A kind of LED control chip | |
| CN110189712A (en) | A kind of drive circuit for backlight module group, display device and control method | |
| CN102035381B (en) | BOOST circuit with adjusting starting voltage | |
| CN102281683A (en) | LED anti-flash circuit | |
| CN202005020U (en) | Dynamic load adjustment module and liquid crystal display equipment | |
| CN102682714A (en) | LED backlight source driving circuit and method for realizing soft startup | |
| CN102413615A (en) | Two-wire input dimming circuit for DC-DC (direct current-direct current) control | |
| CN201341255Y (en) | LED lamp current switch and control circuit for vehicle body control module | |
| CN104185344A (en) | Light source control circuit, backlight module and display device | |
| CN204205704U (en) | A kind of power selection circuit | |
| CN103677053B (en) | A kind of IC chip input voltage scope optimized circuit and optimization method | |
| CN203520836U (en) | Backlight driving circuit and liquid crystal display device | |
| CN203289546U (en) | Power supply standby circuit and LED (light-emitting diode) liquid crystal display television |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent of invention or patent application | ||
| CB02 | Change of applicant information |
Address after: 266071 Shandong city of Qingdao province Jiangxi City Road No. 11 Applicant after: QINGDAO HISENSE ELECTRONICS Co.,Ltd. Address before: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Applicant before: QINGDAO HISENSE ELECTRONICS Co.,Ltd. |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 266071 Shandong city of Qingdao province Jiangxi City Road No. 11 Patentee after: Hisense Visual Technology Co., Ltd. Address before: 266071 Shandong city of Qingdao province Jiangxi City Road No. 11 Patentee before: QINGDAO HISENSE ELECTRONICS Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder |