CN102270928A - power conversion device and power conversion method - Google Patents
power conversion device and power conversion method Download PDFInfo
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- CN102270928A CN102270928A CN2010101990424A CN201010199042A CN102270928A CN 102270928 A CN102270928 A CN 102270928A CN 2010101990424 A CN2010101990424 A CN 2010101990424A CN 201010199042 A CN201010199042 A CN 201010199042A CN 102270928 A CN102270928 A CN 102270928A
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Abstract
The invention discloses a power conversion device and a power conversion method. The power conversion device comprises a power conversion unit and a control unit, wherein the power conversion unit is used for receiving an input voltage and generating an output voltage to a display driving unit based on a control signal, and the control unit is used for providing the control signal to the power conversion unit. The control unit controls the working period or frequency of the control signal according to an image signal.
Description
Technical field
The present invention relates to a kind of power supply change-over device and method thereof, and be particularly related to the power supply change-over device and the method thereof of a kind of tool Adaptive Control (adaptive-control).
Background technology
Well known ground, present display driver circuit generally includes a booster circuit (voltageboosting circuit).Display driver chip with LCD is an example, and the common ends of its panel pixel needs higher voltage to drive, so booster circuit is necessary.The employed booster circuit of display driver chip mainly can be divided into two kinds at present, and a kind of is capacitive charge pump (charge pump), and another kind is the booster circuit (booster) of inductance type.Both frameworks respectively have its pluses and minuses, but purpose all is for voltage being drawn high (pull up).
With regard to the LCD of normality black (normally black), when its displaying contents is the black picture, more not power consumption of display driver chip; When its displaying contents was white picture, display driver chip is power consumption comparatively.On the contrary, with regard to the LCD of normality white (normally white), when its displaying contents is white picture, more not power consumption of display driver chip; When its displaying contents was the black picture, display driver chip is power consumption comparatively.
Yet, present display driver circuit on the market, no matter be the booster circuit that utilizes condenser type or inductance type, work period of its control signal (duty cycle) or the neither meeting of frequency (frequency) are adjusted to some extent along with different displaying contents.In other words, booster circuit always is the power consumption that provides identical, can not adjust to some extent along with different displaying contents, can cause the waste on the energy and the efficient.
Summary of the invention
The invention provides a kind of power supply change-over device, it is suitable for a display drive apparatus.Power supply change-over device can be adjusted the electrical characteristic (as signal amplitude, voltage level, size of current) of its control signal according to the different displaying contents of display drive apparatus.
The invention provides a kind of power conversion method, be suitable for the power supply change-over device of a display drive apparatus, it can adjust the electrical characteristic (as signal amplitude, voltage level, size of current) of the control signal of power supply change-over device according to the different displaying contents of display drive apparatus.
The present invention proposes a kind of power supply change-over device, and it comprises a power conversion unit and a control unit.Power conversion unit is in order to receiving an input voltage, and produces output voltage to a load according to a control signal.Control unit controls signal to power conversion unit in order to provide, and wherein control unit is adjusted the electrical characteristic of control signal according to a picture signal.
In one embodiment of this invention, the characteristics of above-mentioned control unit analysis image signal, and foundation one analysis result is adjusted the work period or the frequency of control signal.
In one embodiment of this invention, the characteristics that the N of above-mentioned control unit analysis image signal opens image frame (image frame), and adjust the work period or the frequency of control signal according to analysis result, wherein N is a positive integer.
In one embodiment of this invention, the N of above-mentioned control unit analysis image signal opens the characteristics that image frame to the (N+k) is opened image frame, and adjust the work period or the frequency of control signal according to analysis result, wherein N, k are respectively a positive integer.
In one embodiment of this invention, the characteristics that N opens image frame and M opens image frame of above-mentioned control unit analysis image signal, and adjust the work period or the frequency of control signal according to analysis result, wherein N, M are respectively a positive integer, and M＞N.
The present invention proposes a kind of power conversion method, and it comprises the steps.According to a picture signal, adjust the electrical characteristic of a control signal.According to control signal, changing an input voltage is an output voltage.Output voltage to one load is provided.
In one embodiment of this invention, the step of the electrical characteristic of above-mentioned adjustment control signal comprises the steps.The characteristics of analysis image signal.According to an analysis result, adjust the work period or the frequency of control signal.
In one embodiment of this invention, when the characteristics of analysis image signal, the characteristics that the N of analysis image signal opens image frame, and adjust the work period or the frequency of control signal according to analysis result, wherein N is a positive integer.
In one embodiment of this invention, when the characteristics of analysis image signal, the N of analysis image signal opens the characteristics that image frame to the (N+k) is opened image frame, and adjust the work period or the frequency of control signal according to analysis result, wherein N, k are respectively a positive integer.
In one embodiment of this invention, when the characteristics of analysis image signal, the characteristics that N opens image frame and M opens image frame of analysis image signal, and adjust the work period or the frequency of control signal according to analysis result, wherein N, M are respectively a positive integer, and M＞N.
Based on above-mentioned, in an embodiment of the present invention, the control unit of power supply change-over device can be according to picture signal, adjust work period, frequency or other electrical characteristics (as signal amplitude, voltage level, size of current) of control signal, make power conversion unit provide different power, can not cause the waste on the energy and the efficient along with the different displaying contents of display.
For above-mentioned feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and conjunction with figs. is described in detail below.
Description of drawings
Fig. 1 is the block schematic diagram of the display of one embodiment of the invention.
Fig. 2 A and Fig. 2 B are the circuit diagram of the power conversion unit of one embodiment of the invention in the different time cycle.
Fig. 3 illustrates the waveform schematic diagram of control signal.
Fig. 4 is the circuit diagram of the power supply change-over device of one embodiment of the invention.
Fig. 5 is the flow chart of the power conversion method of one embodiment of the invention.
Fig. 6 illustrates the intensity map of pixel on the display floater of Fig. 1.
Fig. 7 is the flow chart of the power conversion method of another embodiment of the present invention.
[main element symbol description]
100: display
110: display drive apparatus
112: power supply change-over device
114: the display driver unit
116: power conversion unit
118: control unit
120: display floater
SW1～SW4: switch
COM: comparator
Q: transistor
C: electric capacity
R1, R2: divider resistance
D: diode
A: end points
L: inductance
P1, P2: charge path
V
In: input voltage
V
Out: output voltage
V
Ref: reference voltage
V
CI: voltage
V
D: driving voltage
S
In: picture signal
PWM: control signal
T1, T2: time cycle
T1+T2: pulse period
T1/ (T1+T2): work period
S500, S502, S504, S506, S700, S702, S704, S706, S708, S710: the step of power conversion method
Embodiment
In the following embodiments, will be with LCD and booster circuit thereof as exemplary embodiment, those skilled in the art are when knowing that LCD and booster circuit thereof are not in order to limit display of the present invention and power-switching circuit thereof.Simultaneously, the present invention also is not limited to the power-switching circuit of condenser type or inductance type, and any such as electronic circuit with power source conversion function is all the scope of institute of the present invention desire protection.
Fig. 1 is the block schematic diagram of the display of one embodiment of the invention.Please refer to Fig. 1, in the present embodiment, display 100 comprises a display drive apparatus 110 and a display floater 120.At this, display drive apparatus 110 comprises a power supply change-over device 112 and display driver unit 114, and wherein display driver unit 114 is in order to drive display floater 120.
In the present embodiment, power supply change-over device 112 comprises a power conversion unit 116 and a control unit 118.Power conversion unit 116 is in order to receive an input voltage V
In, and foundation one control signal PWM produces an output voltage V
OutTo display driver unit 114.Control unit 118 is in order to provide control signal PWM to power conversion unit 116, and wherein control unit 118 is according to a picture signal S
In, the electrical characteristic of adjustment control signal PWM.
In the exemplary embodiment below, 118 adjustment persons of control unit are example with work period or the frequency of control signal PWM, but the present invention is not limited to this.When control unit 118 according to picture signal S
In, when the work period of adjustment control signal PWM or frequency, power conversion unit 116 can provide different power along with the different displaying contents of display, can not cause the waste on the energy and the efficient.In other embodiments, power supply changes other electrical characteristics that control unit 118 also can be adjusted control signal PWM, so that power conversion unit 116 provides different power along with the different displaying contents of display.
Specifically, Fig. 2 A and Fig. 2 B are the circuit diagram of the power conversion unit 116 of one embodiment of the invention at different time period T 1, T2.The waveform schematic diagram of the control signal PWM that Fig. 3 illustrates.
Please refer to Fig. 2 A, Fig. 2 B and Fig. 3, the control signal PWM of present embodiment for example is a pulse width modulation (pulse width modulation, PWM) signal, its work period for example is T1/ (T1+T2), that is control signal PWM experiences the ratio of high-tension period of time T 1 and pulse period T1+T2.
At this, the power conversion unit 116 of Fig. 2 A and Fig. 2 B is to be exemplary embodiment with the capacitance type voltage-boosting circuit, but the invention is not restricted to this.In other embodiments, power conversion unit for example also can be that an inductance type booster circuit, mixes condenser type inductance type booster circuit, or the booster circuit of other types.
In the present embodiment, during period of time T 1, by digital control approach, actuating switch SW1, SW4, and off switch SW2, SW3.This moment, transistor Q was for ending voltage V
CIP1 charges to capacitor C by charge path, so the voltage of a terminal A of capacitor C is V
CI
Then, during period of time T 2, by digital control approach, actuating switch SW2, SW3, and off switch SW1, SW4.This moment, transistor Q was conducting, input voltage V
InP2 charges to capacitor C by charge path, so the voltage of the terminal A of capacitor C is V
CI+ V
In
So after finishing at least one pulse period T1+T2, the voltage of terminal A is promptly drawn high is V
CI+ V
In, and as output voltage V
Out, use to offer display driver unit 114.
Fig. 4 is the circuit diagram of the power supply change-over device of one embodiment of the invention.Please refer to Fig. 4, the power supply change-over device 112 of present embodiment is to be exemplary embodiment with the inductance type booster circuit, but the invention is not restricted to this.
In the present embodiment, transistor Q is opened or closed to control unit 118 by control signal PWM, makes input voltage V
InCan charge to capacitor C.Therefore, after finishing at least one pulse period T1+T2, output voltage V
OutCan be drawn high, and offer display driver unit 114 and use.Simultaneously, make Voltage Feedback, can make output voltage V by divider resistance R1, R2 and comparator C OM
OutStable maintenance within the specific limits.
By the exemplary embodiment of above-mentioned Fig. 2 A～Fig. 4 as can be known, the work period of control signal PWM or frequency all can influence power consumption performance (power consumption) and the efficient of power conversion unit 116, and influence output voltage V
OutFiltering (ripple) size.
Therefore, in an embodiment of the present invention, control unit 118 can be according to picture signal S
InAdjust work period or the frequency of control signal PWM, make power conversion unit 116 that different voltage can be provided along with different displaying contents, can not cause the waste on the energy and the efficient.
Fig. 5 is the flow chart of the power conversion method of one embodiment of the invention.Please refer to Fig. 1 and Fig. 5, in the present embodiment, control unit 118 can first analysis image signal S
InThe N characteristics of opening image frame, as step S500.
At this, it for example is the image frame that is showing at present that N opens image frame.In other embodiments, to open image frame also can be at picture signal S to N
InThe middle image frame that had shown in the past, or the image frame of following institute desire demonstration.
In the present embodiment, the characteristics analyzed of control unit 118 for example is image analytic degree, image brightness, image spectrum distribution, image analytic degree, the image difference opposite sex, image correlation, image color number, image update rate or the display mode of this image frame.
Then, in step S502, control unit 118 can be according to analysis result, work period or the frequency of decision control signal PWM.At this, control unit 118 can be by work period or the frequency calculating, table look-up, the rule of thumb, expert system or other modes decide control signal PWM.
Afterwards, in step S504, control unit 118 is adjusted control signal PWM according to the work period or the frequency that are determined at step S502 by numeral or simulated mode.
At last, in step S506, the control signal PWM that power conversion unit 116 is provided according to control unit 118 is with input voltage V
InDraw high and be output voltage V
Out, and export display driver unit 114 to.
In another embodiment, control unit 118 for example is analysis image signal S
InThe characteristics that N opens image frame and M opens image frame.It for example is the image frame that is showing at present that the N of this moment opens image frame, and M opens the image frame that image frame for example is the desire demonstration of following institute, and wherein N, M are respectively a positive integer, and M＞N.。
Therefore, control unit 118 can be analyzed the characteristics that N opens image frame and M opens image analytic degree, image brightness, image spectrum distribution, the image difference opposite sex, image correlation, image color number, image update rate or the display mode etc. of image frame, with the otherness of characteristics more between the two, and then work period or the frequency of decision control signal PWM.
Below will be at different characteristics, the discriminant approach of illustration correspondence is as exemplary embodiment.
With regard to the resolution of image frame, identical display drive apparatus may be used for the resolution of different image frames.For example, when the resolution of image frame becomes big, display drive apparatus the panel pixel that must drive more, and when the resolution of image frame diminishes, the panel pixel of the necessary driving of display drive apparatus institute is less.
Therefore, behind the resolution of control unit analysis image picture, if when its analysis result was a resolution less than a specific critical value, then according to this analysis result, work period or frequency that control unit can be adjusted control signal were a preset working cycle or a frequency.On the contrary, if its analysis result is a resolution during greater than this specific critical value, then according to this analysis result, work period or frequency that control unit can be adjusted control signal are another preset working cycle or frequency.
In other words, control unit can be adjusted the work period or the frequency of control signal adaptively according to the resolution of different image frames.And its adjustment mode for example is to adjust the work period or the frequency of control signal according to table look-up correspondence, linear scale correspondence, the rule of thumb, non-linear rule, Theoretical Calculation or customized special pattern, but the invention is not restricted to this.
With regard to the brightness of image frame, with organic light emitting diode display (organic lightemitting diode display, OLED display) display drive apparatus is an example, and when the picture of display was dark partially, the needed drive current of display floater did not need too big.Therefore, when image frame when being complete black, the needed drive current minimum of display floater, when image frame be entirely in vain the time, the needed drive current maximum of display floater.
In other words, no matter be organic light emitting diode display, LCD, plasma display, cathode ray tube (cathode-ray tube, CRT) display or other displays, for the image frame of different brightness, required voltage that provides of its display drive apparatus or electric current also can change to some extent.
For example, Fig. 6 illustrates the intensity map (histogram) of pixel on the display floater 120 of Fig. 1.Please refer to Fig. 1 and Fig. 6, the pixel brightness contribution figure that Fig. 6 illustrated for example is to be the image frame of 480x800 corresponding to image analytic degree, and its image color degree of depth is the 8-bit degree of depth (i.e. 0 representative is the most black, and 255 representatives are the whitest).Therefore, if the brightness of the shown image frame of display floater 120 is brighter, then more at the pixel quantity of high gray Luminance Distribution.
At this, suppose that with a statistics parameter 20% be a critical reference value, its representative counting pixel quantity is 20% o'clock a critical value of total pixel.With the image analytic degree is 480x800, is 480x800=384 if image is always drawn quantity, 000, and then image is always drawn 20% of number and is 384,000x20%=76,800 pixels.
Furthermore, suppose numerical value of N
255Representing this image gray-scale level is 255 total quantity, numerical value of N
254Representing this image gray-scale level is 254 total quantity, numerical value of N
253Representing this image gray-scale level is 253 total quantity ..., numerical value of N
1Representing this image gray-scale level is 1 total quantity, and numerical value of N
0Representing this image gray-scale level is 0 total quantity.Therefore, work as numerical value of N
255〉=76,800 o'clock, promptly 20% pixel is arranged was to be distributed in GTG 255 to representative image.This moment is because numerical value of N
255Greater than total draw number 20% (promptly Ji Shuo pixel value arrived setting 20%), so control unit can GTG 255 as index, and adjust the work period or the frequency of control signal in view of the above.
In the intensity map that Fig. 6 illustrated, for example be with GTG 244 as index, promptly represent N
255+ N
254+ N
253+ ... + N
244〉=76,800 o'clock, in other words, it was to be distributed in GTG 244～255 that 20% pixel is arranged.
Suppose numerical value of N
255+ N
254+ N
253+ ... + N
240〉=76,800, in other words, it is to be distributed in GTG 240～255 that 20% pixel is arranged, then this moment control unit can GTG 240 as index, and adjust the work period or the frequency of control signal in view of the above.
Suppose numerical value of N
255+ N
254+ N
253+ ... + N
13〉=76,800, in other words, it is to be distributed in GTG 13～255 that 20% pixel is arranged.Then this moment control unit can GTG 13 as index, and produce the work period or the frequency of control signal in view of the above.
So with regard to above-mentioned rule, brighter figure, because graphical pixel can be distributed in higher GTG value mostly, therefore for brighter figure, the luminance index of its figure can be than higher.Opposite, darker figure, because graphical pixel can be distributed in lower GTG value mostly, therefore for darker figure, the luminance index of its figure can be lower.
So the index that above-mentioned rule produced, it is bright partially or dark partially helping to provide circuit to differentiate present display graphics.Therefore circuit just can decide work period or its frequency of booster circuit control signal according to the luminance index of figure, or other electrical characteristics of its control signal (as signal amplitude, voltage level, size of current).
At this, it for example is to adjust the work period or the frequency of control signal according to table look-up correspondence, linear scale correspondence, the rule of thumb, non-linear rule, Theoretical Calculation or customized special pattern that control signal is adjusted mode, but the invention is not restricted to this.In addition, above-mentioned account form is not also in order to limit the present invention.
Therefore, control unit can be adjusted the work period or the frequency of control signal adaptively according to the brightness of different image frames.And its adjustment mode for example is to adjust the work period or the frequency of control signal according to table look-up correspondence, linear scale correspondence, the rule of thumb, non-linear rule, Theoretical Calculation or customized special pattern, but the invention is not restricted to this.In addition, the present invention also is not limited to the frequent degree of obtaining image brightness, image brightness measures of dispersion or image brightness measures of dispersion in which way.
With regard to the spectrum distribution of image frame, when the lines of two image frames in front and back is different, represent both spectrum distribution also different.Therefore, the big more or change of the variation of the spectrum distribution of two image frames in front and back is when frequent more, represent the displaying contents of display floater that in various degree change is arranged, and different displaying contents has different power consumptions and shows.
Therefore, control unit can be adjusted the work period or the frequency of control signal adaptively according to the spectrum distribution of different image frames.And its adjustment mode for example is to adjust the work period or the frequency of control signal according to table look-up correspondence, linear scale correspondence, the rule of thumb, non-linear rule, Theoretical Calculation or customized special pattern, but the invention is not restricted to this.In addition, the present invention also is not limited to and obtains image spectrum, image spectrum measures of dispersion, image spectrum measures of dispersion in which way in the aggregate-value of length or the frequent degree of image spectrum measures of dispersion.
With regard to the otherness of image frame, the otherness of two or N opens and the otherness of the image frame that M opens, otherness change frequent degree or image frame was at the aggregate-value of length before and after control unit can be analyzed.
Therefore, control unit can be adjusted the work period or the frequency of control signal adaptively according to the otherness of image frame.And its adjustment mode for example is to adjust the work period or the frequency of control signal according to table look-up correspondence, linear scale correspondence, the rule of thumb, non-linear rule, Theoretical Calculation or customized special pattern, but the invention is not restricted to this.In addition, the present invention also is not limited to and obtains the image difference opposite sex in which way.
With regard to the correlation of image frame, the correlation of two or N opens and the correlation of the image frame that M opens, correlation change frequent degree or image frame was at the aggregate-value of length before and after control unit can be analyzed.
Therefore, control unit can be adjusted the work period or the frequency of control signal adaptively according to the correlation of image frame.And its adjustment mode for example is to adjust the work period or the frequency of control signal according to table look-up correspondence, linear scale correspondence, the rule of thumb, non-linear rule, Theoretical Calculation or customized special pattern, but the invention is not restricted to this.In addition, the present invention also is not limited to and obtains image correlation in which way.
With regard to the change of image color number, when the number of colors of display drive apparatus changed, control unit can be adjusted the work period or the frequency of control signal adaptively according to the change of this number of colors.For example, when the color mode of display by 262K color (262k colors) mode switch to 16.7M color (16.7M colors) pattern, when perhaps switching to 8-color (8-colors) pattern by the 16.7M color mode, control unit can be adjusted the work period or the frequency of control signal adaptively according to the change of this number of colors.In addition, the present invention also is not limited to switch to which kind of color mode in which way.
With regard to the image update rate, when the turnover rate of image frame changed, control unit can be adjusted the work period or the frequency of control signal adaptively according to the change of this turnover rate.For example, when the turnover rate of image frame switches to 30 hertz by 60 hertz (Hz), when perhaps switching to 60 hertz by 30 hertz, control unit can be adjusted the work period or the frequency of control signal adaptively according to the change of this turnover rate.
With regard to the display mode of image frame, when the display mode of image frame changed, control unit can be adjusted the work period or the frequency of control signal adaptively according to the change of this display mode.For example, when the display mode of image frame by 2 dimensions (2-dimensional, 2D) mode switch is to 3 dimensional patterns, when perhaps switching to 2 dimensional patterns by 3 dimensional patterns, control unit can be adjusted the work period or the frequency of control signal adaptively according to the change of this display mode.
With regard to the sharpness (sharpness) of image frame, on its panel of image frame of pure color system neighbor to discharge and recharge frequency more not frequent.Therefore, (fast Fourier transform, in the time of FFT), the calculated value of control unit gained can be less relatively when control unit carries out spectrum analysis and 2 dimension fast fourier transform to the image frame of this pure color system.On the contrary, when control unit was tieed up fast fourier transform to carry out spectrum analysis and 2 than the complex image picture, the calculated value of control unit gained can be relatively large.The image sharpness account form also has other several account forms in addition, and the present invention also is not limited to and obtains the image sharpness characteristic in which way.
Therefore, control unit can be adjusted the work period or the frequency of control signal adaptively according to the sharpness (i.e. Dui Ying calculated value) of image frame.And its adjustment mode for example is to adjust the work period or the frequency of control signal according to table look-up correspondence, linear scale correspondence, the rule of thumb, non-linear rule, Theoretical Calculation or customized special pattern, but the invention is not restricted to this.
Fig. 7 is the flow chart of the power conversion method of another embodiment of the present invention.Please refer to Fig. 1 and Fig. 7, the power conversion method difference of the power conversion method of present embodiment and Fig. 5 for example is: the power conversion method of present embodiment can be accumulated an analysis result to several characteristics, determines work period or the frequency of control signal PWM again.
At first, in step S700, control unit can be analyzed N earlier and open characteristics, and temporary its analysis result S
N, wherein N is an integer.
In the present embodiment, to open image frame for example be the image frame that is showing at present to N.In other embodiments, to open image frame also can be at picture signal S to N
InThe middle image frame that had shown in the past, or the image frame of following institute desire demonstration.
Then, in step S702, control unit can continue to analyze the characteristic of the picture material that N+K opens, and its temporary analysis result S
N+K, wherein K also is an integer.
In the present embodiment, the N that analyzed of control unit 118 opens and N+K opens image brightness, image spectrum distribution, the image difference opposite sex, image correlation, image color number, image update rate or the display mode that characteristics for example is this image frame.
Afterwards, in step S704, control unit can carry out a judgment mechanism with continuity, discontinuity or periodically according to the picture characteristics of being analyzed S as a result
N, S
K+NOr once or accumulation picture characteristics analysis result for several times, determine whether adjusting the work period or the frequency of control signal.
For example, if when the work period of control unit decision need adjustment control signal or frequency, then the flow process of power conversion method can be carried out step S706, its adjustment mode for example is to adjust the work period or the frequency of control signal according to table look-up correspondence, linear scale correspondence, the rule of thumb, non-linear rule, Theoretical Calculation or customized special pattern, but the invention is not restricted to this.
On the contrary, if when control unit decision need not adjusted, work period or frequency that then can control signal will remain unchanged.Simultaneously, control unit can continue to add up the picture characteristics that N+I opens, by that analogy.In other words, if when work period of control signal or frequency are not adjusted in control unit decision, the flow process of power conversion method can be got back to step S700 by step S704, continues the picture characteristics that statistics N+I opens.
Then, in step S708, control unit 118 is adjusted control signal PWM according to the work period or the frequency that are determined at step S706 by numeral or simulated mode.
At last, in step S710, the control signal PWM that power conversion unit 116 is provided according to control unit 118 is with input voltage V
InDraw high and be output voltage V
Out, and export display driver unit 114 to.
Therefore, the power conversion method of present embodiment can be accumulated an analysis result to several characteristics, determines work period or the frequency of control signal PWM again.
In another embodiment, power conversion method also can determine corresponding work period or the frequency of the control signal PWM of analysis result each time earlier, calculates to readaptability work period or the frequency of control signal PWM.
In sum, in an embodiment of the present invention, the control unit of power supply change-over device can be according to characteristics to several image frames in the picture signal, adjust work period, frequency or other electrical characteristics of control signal, make power conversion unit provide different power, can not cause the waste on the energy and the efficient along with the different displaying contents of display.
Though the present invention with embodiment openly as above; right its is not in order to qualification the present invention, those skilled in the art, without departing from the spirit and scope of the present invention; when doing a little change and retouching, so protection scope of the present invention is as the criterion when looking the appended claims person of defining.
Claims (10)
1. power supply change-over device comprises:
One power conversion unit in order to receiving an input voltage, and produces output voltage to a load according to a control signal; And
One control unit controls signal to this power conversion unit in order to this to be provided, and wherein this control unit is adjusted the electrical characteristic of this control signal according to a picture signal.
2. power supply change-over device as claimed in claim 1, wherein this control unit is analyzed the characteristics of this picture signal, and adjusts the work period or the frequency of this control signal according to an analysis result.
3. power supply change-over device as claimed in claim 2, wherein this control unit is analyzed the characteristics that the N of this picture signal opens image frame, and adjusts the work period or the frequency of this control signal according to this analysis result, and wherein N is a positive integer.
4. power supply change-over device as claimed in claim 2, wherein this control unit N of analyzing this picture signal opens the characteristics that image frame to the (N+k) is opened image frame, and adjust the work period or the frequency of this control signal according to this analysis result, wherein N, k are respectively a positive integer.
5. power supply change-over device as claimed in claim 2, wherein this control unit is analyzed the characteristics that N opens image frame and M opens image frame of this picture signal, and adjust the work period or the frequency of this control signal according to this analysis result, wherein N, M are respectively a positive integer, and M＞N.
6. a power conversion method is suitable for a power supply change-over device, and this power conversion method comprises:
Adjust the electrical characteristic of a control signal according to a picture signal;
Changing an input voltage according to this control signal is an output voltage; And
This output voltage to one load is provided.
7. power conversion method as claimed in claim 6, this step of wherein adjusting the electrical characteristic of this control signal comprises:
Analyze the characteristics of this picture signal; And
Adjust the work period or the frequency of this control signal according to an analysis result.
8. power conversion method as claimed in claim 7, wherein when analyzing the characteristics of this picture signal, analyze the characteristics that the N of this picture signal opens image frame, and adjust the work period or the frequency of this control signal according to this analysis result, wherein N is a positive integer.
9. power conversion method as claimed in claim 7, wherein when analyzing the characteristics of this picture signal, the N that analyzes this picture signal opens the characteristics that image frame to the (N+k) is opened image frame, and adjust the work period or the frequency of this control signal according to this analysis result, wherein N, k are respectively a positive integer.
10. power conversion method as claimed in claim 7, wherein when analyzing the characteristics of this picture signal, analyze the characteristics that N opens image frame and M opens image frame of this picture signal, and adjust the work period or the frequency of this control signal according to this analysis result, wherein N, M are respectively a positive integer, and M＞N.
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| CN2010101990424A CN102270928A (en) | 2010-06-07 | 2010-06-07 | power conversion device and power conversion method |
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| CN2010101990424A CN102270928A (en) | 2010-06-07 | 2010-06-07 | power conversion device and power conversion method |
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| CN2010101990424A Pending CN102270928A (en) | 2010-06-07 | 2010-06-07 | power conversion device and power conversion method |
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| CN104917372A (en) * | 2014-03-12 | 2015-09-16 | 矽创电子股份有限公司 | Power supply conversion system |
| CN106941751A (en) * | 2017-04-27 | 2017-07-11 | 宁波迪明斯电子科技有限公司 | A kind of drive circuit of variable voltage |
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