CN102169674B - 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
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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 especially a kind of dynamic load adjustment module and liquid crystal display and voltage adjusting method.
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 magnitude of voltage voltage when working over LED lamp bar that may raise, thus thereby the lamp bar occurring causes the lamp bar in the moment of lighting overcurrent damages or the situation of the lost of life due to overvoltage.
Exist operating circuit supply voltage in transient state process to waft height in prior art and cause the problem of component wear or the lost of life, not yet proposing at present effective solution for this problem.
Summary of the invention
Fundamental purpose of the present invention is to propose a kind of dynamic load adjustment module and liquid crystal display and voltage adjusting method, to solve that operating circuit supply voltage in transient state process in prior art wafts height and the problem that causes 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 adjustment module.
Dynamic load adjustment module of the present invention be used for to be adjusted operating circuit at the transient state process of the accepting power supply high supply voltage that wafts, described dynamic load adjustment 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 from described power output end when receiving described control signal the voltage of described power output end.
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 the first resistance and the second resistance, and wherein: the first end of described the first resistance is described voltage input end, and the second end is connected with the first end of described the second resistance; The second end of described the second resistance is connected with the earth point of described device; The link of described the first resistance and the 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: the first end of described voltage stabilizing diode is connected with described dividing potential drop output terminal, and the second end is connected with the first end of described the 3rd resistance, the 4th resistance; The second end of described the 3rd resistance is the output terminal of described output circuit; The 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: the first end of described the 5th resistance is connected with described power output end, and the second end is connected with the first end of described on-off element; The second end of described on-off element is connected with the 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; The 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 the second end, and emitter-base bandgap grading is as described the 3rd end.
Further, described discharge circuit comprises three ports, and wherein the first port is connected with described power output end, and the 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 the first port was communicated with described the 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 adjustment module of the present invention, the LED drive circuit that described dynamic load adjustment module is used for the adjusting 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 be used for to be adjusted 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; During greater than predeterminated voltage, shunt to reduce the voltage of described power output end at the voltage of power output end from 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 to control the shunting from this power output end according to this voltage, wafing when high at voltage at this power output end like this can be in the effect decline low-voltage of shunting, thereby avoids 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 a further understanding of the present invention, consists of the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction 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 schematic diagram according to the basic structure of the dynamic load adjustment module of the embodiment of the present invention;
Fig. 3 is the schematic diagram according to a kind of concrete structure of the voltage acquisition circuit 21 of the embodiment of the present invention;
Fig. 4 is the schematic diagram according to a kind of concrete structure of the discharge circuit of the embodiment of the present invention;
Fig. 5 is the schematic diagram according to a kind of concrete composition of the bleeder circuit of the embodiment of the present invention;
Fig. 6 is the schematic diagram according to a kind of concrete composition of the output circuit of the embodiment of the present invention;
Fig. 7 is the schematic diagram according to a kind of concrete composition of the discharge circuit of the embodiment of the present invention;
Fig. 8 is the schematic diagram according to a kind of concrete structure of the dynamic load adjustment module of the embodiment of the present invention;
Fig. 9 is the schematic diagram of LED driving voltage waveform when not adopting and adopting the dynamic load adjustment module of the embodiment of the present invention in the liquid crystal display LED drive circuit;
Figure 10 is the anti-schematic diagram that swashs voltage waveform on the primary metal-oxide-semiconductor in LED drive circuit when not adopting and adopting the dynamic load adjustment module of the embodiment of the present invention in the liquid crystal display LED drive circuit;
Figure 11 is the schematic diagram according to the basic structure of the liquid crystal display of the embodiment of the present invention;
Figure 12 is the circuit diagram that comprises the dynamic load module in liquid crystal display according to the embodiment of the present invention; And
Figure 13 is the schematic diagram according to the method key step of the voltage adjustment of the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is illustrated.In the situation that do not conflict, embodiment and the feature in embodiment in the application can make up mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.
Fig. 2 is the schematic diagram according to the basic structure of the dynamic load adjustment module of the embodiment of the present invention.
As shown in Figure 2, the dynamic load adjustment module 20 of the embodiment of the present 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 produces in the transient state process of accepting power supply, for example this operating circuit is the LED drive circuit of liquid crystal display, the power supply of this LED drive circuit produces voltage and wafts when high in LED television startup process, can adopt the dynamic load adjustment module in the present embodiment.Below mainly as an example of the LED drive circuit that is applied to liquid crystal display example, structure and the duty of the dynamic load adjustment module of the embodiment of the present invention are made an explanation.
Can find out from said structure shown in Figure 2, the voltage of the power output end of the LED drive circuit of the present embodiment by obtaining liquid crystal display, generate control signal to control the shunting from this power output end according to this voltage, wafing when high at voltage at this power output end like this can be in the effect decline low-voltage of shunting, thereby avoids 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 schematic diagram according to a kind of concrete structure of the voltage acquisition circuit 21 of the embodiment of the present 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 schematic diagram according to a kind of concrete structure of the discharge circuit of the embodiment of the present 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 consists of the dynamic load adjustment module in the present invention.Below be described further again for the optional concrete structure of these circuit.
Fig. 5 is the schematic diagram according to a kind of concrete composition of the bleeder circuit of the embodiment of the present invention.
As shown in Figure 5, bleeder circuit 211 comprises the first resistance 211R1 and the second resistance 211R2, and wherein the first end of the first resistance 211R1 is voltage input end 211A, and the second end is connected with the first end of the second resistance 211R2.The second end of the second resistance 211R2 is connected with the earth point GND of dynamic load adjustment module, and the link of the first resistance 211R1 and the second resistance 211R2 (in figure shown in the A point) is the dividing potential drop output terminal.
Fig. 6 is the schematic diagram according to a kind of concrete composition of the output circuit of the embodiment of the present invention.
As shown in Figure 6, output circuit 212 comprises voltage stabilizing diode VD1, the 3rd resistance 212R3, the 4th resistance 212R4, wherein the first end of voltage stabilizing diode VD1 is connected with dividing potential drop output terminals A point, the second end is connected with the first end of the 3rd resistance 212R3, the 4th resistance 212R4, the second end of the 3rd resistance 212R3 is the output terminal 212B of output circuit 212, and the second end of the 4th resistance 212R4 is connected with the earth point GND of dynamic load adjustment module.
Fig. 7 is the schematic diagram according to a kind of concrete composition of the discharge circuit of the embodiment of the present invention.
As shown in Figure 7, discharge circuit 22 comprises the 5th resistance 22R5, on-off element 221, electric capacity 222, and wherein the first end of the 5th resistance 22R5 is connected with the power output end U of LED drive circuit, and the second end is connected with the first end of on-off element 221; The second end of on-off element 221 is connected with the 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 adjustment module; The 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, can be for example negative-positive-negative transistor, and its collector, base stage and emitter-base bandgap grading are respectively as first end, the 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 adjustment module in the embodiment of the present invention, as shown in Figure 8.Fig. 8 is the schematic diagram according to a kind of concrete structure of the dynamic load adjustment module of the embodiment of the present invention.Below in conjunction with Fig. 8, the circuit working process of this structure is analyzed.
In Fig. 8, the parameter of each element can be taken as respectively: the resistance of the first resistance 211R1 is 440K ohm; The resistance of the 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, the resistance of the larger 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, due to the output voltage of the output voltage of 100V one tunnel and 12V one tunnel from same transformer, thereby cause wafing on the output voltage of 100V one tunnel.When this road output voltage was 100V, A place, the set-point voltage that moves was (the U point voltage represents 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 when above to 107V, the voltage-to-ground of point A reaches U * 211R2/ (211R1+211R2)=107 * 82/ (440+82) more than V=16.8V, due to 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 the upper current sinking of resistance 22R5, thereby drags down the U point voltage.
After liquid crystal display is lighted, to LED lamp bar power supply, self load increases due to U voltage, thereby makes lower voltage 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 affect the normal operation of peripheral circuits.Do not have power consumption because triode 221 is in cut-off state on resistance 22R5 this moment.Electric current on resistance 211R1 and resistance 211R2 is very little, and power consumption is also just very little, close to 0 watt, so whole dynamic load adjustment module there is no power consumption when being failure to actuate, does not affect 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 affect the normal operation of peripheral circuits.The same when lighting with liquid crystal display, triode 221 is in cut-off state, there is no power consumption on resistance 22R5.Electric current on resistance 211R1 and resistance 211R2 is very little, thereby power consumption is very little, close to 0 watt.So during standby, whole dynamic load circuit also there is no power consumption, does not affect the power consumption of whole power panel.
For the dynamic load adjustment module of the present embodiment, can change when needed the parameter of above-mentioned each element, thereby realize the voltage that waves is arbitrarily dragged down.Resistance that for example can adjusting 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 that resistance by adjusting resistance 211R2 decides.
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; The resistance of all right adjusting resistance 22R5, change the amplitude that drags down U voltage in addition.In addition, resistance 211R2, resistance 212R4, resistance 22R5 can also be coordinated together and adjust, realize more preferably effect.
Fig. 9 is the schematic diagram of LED driving voltage waveform when not adopting and adopting the dynamic load adjustment module of the embodiment of the present invention in the liquid crystal display LED drive circuit.
In Fig. 9, LED driving voltage waveform when the waveform 91A in square frame 91 and square frame 92 and waveform 92A are respectively the dynamic load adjustment module that does not adopt and adopt the embodiment of the present 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 intuitively that from Fig. 9 the dynamic load adjustment module of the embodiment of the present invention is on the impact of LED driving voltage.
In waveform 91A, the LED driving voltage height that wafts, 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.
Will waveform 91A and waveform 92A contrast after can find out, when not adopting the dynamic load adjustment module of the present embodiment, 12V one road bringing onto load is when heavier in the liquid crystal display start process, the LED driving voltage can waft to 238V; And above-mentioned LED driving voltage only wafts to 220V when adopting the dynamic load adjustment module of the present embodiment.As seen adopt the dynamic load adjustment module of the present embodiment can make that in the liquid crystal display start process, the LED driving voltage is dragged down 18V, the high voltage that namely wafts is significantly dragged down.And after start process finished, the voltage in waveform 91A and waveform 92A all was stabilized in 100V, that is to say that the dynamic load adjustment module of the present embodiment does not affect the duty of the rear LED drive circuit of start.
Figure 10 is the anti-schematic diagram that swashs voltage waveform on the primary metal-oxide-semiconductor in LED drive circuit when not adopting and adopting the dynamic load adjustment module of the embodiment of the present invention in the liquid crystal display LED drive circuit.
In Figure 10, the anti-sharp voltage waveform on the primary metal-oxide-semiconductor when the waveform 101A in square frame 101 and square frame 102 and waveform 102A are respectively the dynamic load adjustment module that does not adopt and adopt the embodiment of the present invention in the liquid crystal display LED drive circuit in LED drive circuit.The point of zero voltage of waveform 101A and waveform 102A flushes, and can find out intuitively that from figure the dynamic load adjustment module of the embodiment of the present invention is on the anti-impact that swashs voltage on metal-oxide-semiconductor.
In waveform 101A, the anti-sharp voltage electricity on 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 metal-oxide-semiconductor is 594V, significantly decreases compared with 630V, has increased thus the anti-surplus that swashs voltage on the metal-oxide-semiconductor.
Circuit in Fig. 8 is as 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 schematic diagram according to the basic structure of the liquid crystal display of the embodiment of the present invention.As shown in figure 11, comprise power supply 113 and the dynamic load adjustment module 114 of LED drive circuit 112, LED drive circuit 112 in liquid crystal display 111, the output terminal 1131 of this power supply 113 is connected with dynamic load adjustment module 114.The structure of dynamic load adjustment module 114 can adopt the structure of the dynamic load adjustment module 20 in the present embodiment, like this, wafts when high at the output voltage of power supply 113, and dynamic load adjustment module 114 can be adjusted this high voltage that wafts.
Figure 12 is the circuit diagram that comprises the dynamic load module in liquid crystal display according to the embodiment of the present invention.As shown in figure 12, the circuit in square frame 121 represents the dynamic load in the embodiment of the present invention.Increase the dynamic load adjustment module of the present embodiment in circuit after, can realize following beneficial effect:
Realized to the function of LED drive circuit dynamic appending load, namely in the liquid crystal display start process, when the LED driving voltage surpasses a certain value, dynamic load adjustment module work is to realize adding load;
Realized control that the LED drive circuit supply voltage is dragged down, namely only waft at this voltage and it is dragged down when high, thereby stop adding load and quit work at the rear dynamic load adjustment module of liquid crystal display start process end, do not affect the output of LED drive circuit;
Realized reducing the anti-purpose that swashs voltage on the metal-oxide-semiconductor of the primary circuit in 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 adjustment module versatility in the present embodiment is stronger, can the appropriate design parameter supply voltage of operating circuit when determining from voltage acquisition circuit to discharge circuit output control signal, this supply voltage is dragged down according to setting value.
Figure 13 is the schematic diagram according to the method key step of the voltage adjustment of the embodiment of the present invention.As shown in figure 13, the method mainly comprises the steps:
Step S131: the voltage that obtains power output end;
Step S133: during greater than predeterminated voltage, shunt to reduce the voltage of power output end from power output end at 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 thus dynamic adjustment supply voltage, this helps the element in the Protection circuit be not damaged or extend its serviceable life.After step S133, if the voltage of power output end returns to predeterminated voltage under shunting action, can stop this shunting, thus not extra electric consumption electric energy.
obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, carried out by calculation element thereby they can be stored in 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 respectively each integrated circuit modules, perhaps a plurality of modules in them or step being made into the single integrated circuit module realizes.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is only the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (9)
1. dynamic load adjustment 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 adjustment 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 from described power output end when receiving described control signal the voltage of described power output end;
Wherein, 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 dynamic load adjustment module 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.
2. dynamic load adjustment module according to claim 1, is characterized in that, described bleeder circuit comprises the first resistance and the second resistance, wherein:
The first end of described the first resistance is described voltage input end, and the second end is connected with the first end of described the second resistance;
The second end of described the second resistance is connected with the earth point of described dynamic load adjustment module;
The link of described the first resistance and the second resistance is described dividing potential drop output terminal.
3. dynamic load adjustment module according to claim 1, is characterized in that, described output circuit comprises voltage stabilizing diode, the 3rd resistance and the 4th resistance, wherein:
The first end of described voltage stabilizing diode is connected with described dividing potential drop output terminal, and the second end is connected with the first end of described the 3rd resistance, the 4th resistance;
The second end of described the 3rd resistance is the output terminal of described output circuit;
The second end of described the 4th resistance is connected with the earth point of described dynamic load adjustment module.
4. dynamic load adjustment module according to claim 3, is characterized in that, described discharge circuit comprises the 5th resistance, on-off element, electric capacity, wherein:
The first end of described the 5th resistance is connected with described power output end, and the second end is connected with the first end of described on-off element;
The second end of described on-off element is connected with the 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 dynamic load adjustment module;
The second end of described electric capacity is connected with the earth point of described dynamic load adjustment module; And,
When described on-off element was received described control signal at its second end, its first end was communicated with the 3rd end.
5. dynamic load adjustment module according to claim 4, 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 the second end, and emitter-base bandgap grading is as described the 3rd end.
6. dynamic load adjustment module according to claim 1, it is characterized in that, described discharge circuit comprises three ports, wherein the first port is connected with described power output end, the 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 dynamic load adjustment module; When described the second port received described control signal, described the first port was communicated with described the 3rd port, makes described discharge circuit realize described shunting.
7. the described dynamic load adjustment module of any one according to claim 1 to 6, is characterized in that, described operating circuit comprises the LED drive circuit of liquid crystal display.
8. liquid crystal display, it is characterized in that, described liquid crystal display has the described dynamic load adjustment module of any one in claim 1 to 6, the LED drive circuit that described dynamic load adjustment module is used for the adjusting described liquid crystal display high supply voltage that wafts.
9. voltage adjusting method, be used for to adjust operating circuit at the transient state process of the accepting power supply high supply voltage that wafts, it is characterized in that, adopt in claim 1 to 6 the described dynamic load adjustment module of any one to adjust the operating circuit high supply voltage that wafts in the transient state process of accepting power supply, described method comprises:
Obtain the voltage of power output end;
During greater than predeterminated voltage, shunt to reduce the voltage of described power output end at the voltage of power output end from described power output end; And when returning to described predeterminated voltage, described voltage stops described shunting.
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| 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 |
| CN104680996B (en) * | 2015-03-10 | 2017-08-15 | 深圳市华星光电技术有限公司 | A kind of VCOM generative circuits and liquid crystal display |
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| CN102169674A (en) | 2011-08-31 |
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