CN101894527B - Power supply method and power supply device for liquid crystal display device - Google Patents
Power supply method and power supply device for liquid crystal display device Download PDFInfo
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- CN101894527B CN101894527B CN2009101432849A CN200910143284A CN101894527B CN 101894527 B CN101894527 B CN 101894527B CN 2009101432849 A CN2009101432849 A CN 2009101432849A CN 200910143284 A CN200910143284 A CN 200910143284A CN 101894527 B CN101894527 B CN 101894527B
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Abstract
The invention relates to a power supply method and a power supply device for a liquid crystal display device. The power supply device for the liquid crystal display device comprises an AC rectifier, a square-wave generator, an AC voltage/current conversion module and a plurality of DC voltage/current conversion modules, wherein the AC rectifier is coupled to an AC power supply and converts the AC power supply into a DC power supply; the square-wave generator is coupled to the AC rectifier and generates a first oscillation signal according to the DC power supply; the AC voltage/current conversion module is coupled to the square-ware generator and provides AC voltage for a backlight module of the liquid crystal display device; the plurality of DC voltage/current conversion module provide a plurality of voltage sources for a plurality of load circuits of the liquid crystal display device; and each DC voltage/current conversion module comprises a control circuit, a voltage/current conversion unit and a feedback control unit. The power supply method and the power supply device can transmit voltage/current to all components needing the power supply by voltage/current conversion of fewer times so as to achieve the effects of reducing the decrement of voltage/current efficiency and reducing the component cost.
Description
Technical field
The present invention relates to a kind of power supply method and power supply device that is used for a liquid crystal indicator, relate in particular to a kind of power supply method and power supply device that can reduce the voltage/current impairment and reduce cost.
Background technology
General electronic information series products all includes exclusive power supply device usually, and the AC power that is used for family expenses converts employed voltage when supplying all circuit units operations into.For instance, the power supply device of desktop PC is the DC voltage that earlier home-use AC power is converted into several specific voltage level, sends critical pieces such as motherboard, Winchester disk drive, CD-ROM drive again to via lead.With the motherboard is example; After motherboard receives the DC voltage that sends from power supply device; Can be again according to different part necessary operations voltages of various functions such as the central processing unit that is comprised on the motherboard, dynamic storage, network chips; Remake for the second time or even voltage transitions more frequently, required DC voltage when producing all parts operations.The power supply mode of of this sort complicacy needs the function of supplying power of more power supply with assembly ability complete.
Yet above-mentioned desktop PC is not a special case, and the example that includes complicated electric supply installation and assembly in the household appliances can be described as and can be found everywhere.For instance, recently the universal gradually liquid crystal television system of institute is an obvious example.The power supply device that liquid crystal television system comprised is the power supply mode that belongs to many hierarchical equally.Please refer to Fig. 1, Fig. 1 is for being used for the function block diagram of a power supply device 10 of a LCD TV in the known technology.Power supply device 10 includes a main power supply unit PPU0, a backlight module power supply unit BLPU0 and a governor circuit power supply unit MBPU0.Main power supply unit PPU0 includes a rectifier filer RECT0, a pulse width modulation controlled unit PCU0, a power stage circuit (Power Stage) PS0 and direct current transducer (DC Converter) DCCU0.Rectifier filer RECT0 is used for receiving the alternating current ACin from domestic power supply, and produces a direct current DCP0 accordingly.(Pulse Width Modulation, PWM) mode convert direct supply DCP0 into a pulse-width signal PWM S0 to pulse width modulation controlled unit PCU0 through width modulation.Then; Power stage circuit PS0 carries out filtering to pulse-width signal PWM S0, converts a direct current DCP1 into, again via direct current transducer DCCU0; Convert direct current DCP2 and DCP3 into, offer backlight module power supply unit BLPU0 and governor circuit power supply unit MBPU0 respectively and use.The major function of backlight module power supply unit BLPU0 be with direct current DCP2 change into one be about 1.5 kilovolts (KV) alternating current BLAC1, be used for driving the fluorescent tube in the backlight module.The major function of governor circuit power supply unit MBPU0 is to change direct current DCP3 into many direct currents between 1.2～8 volts (V), is used for directly supplying the required DC voltage of all circuit unit operations on the main control board.
In detail, backlight module power supply unit BLPU0 includes a pulse width modulation controlled unit PCU1, a power stage circuit PS1, an alternating-current converter (AC inverter) ACIU1 and a step-up transformer PVTU1.At first, pulse width modulation controlled unit PCU1 changes direct current DCP2 into pulse-width signal PWM_S1, changes pulse-width signal PWM_S1 into a direct current DCP4 by power stage circuit PS1 again.Secondly, direct current DCP4 converts alternating current BLAC0 to via alternating-current converter ACIU0.At last, alternating current BLAC0 is converted into after the certain high pressure alternating current BLAC1, directly drive the fluorescent tube in the backlight module with alternating current BLAC1 by step-up transformer PVTU1.
In addition, governor circuit power supply unit MBPU0 includes a pulse width modulation controlled unit PCU2, a power stage circuit PS2 and a plurality of direct current transducer (DC Converter) DCCU1～DCCUN.At first, pulse width modulation controlled unit PCU2 changes direct current DCP3 into pulse-width signal PWM_S2, changes pulse-width signal PWM_S2 into a direct current DCP5 by power stage circuit PS2 again.At last, utilize direct current transducer DCCU1～DCCUN to convert direct current DCP5 into a plurality of direct current DC1～DCN between 1.2～8 volts (V), with the required DC voltage of all circuit unit operations on the supply main control board.
Can know according to above narration; The power supply device of LCD TV needs voltage/current is carried out conversion many times in the known technology; Could supply the required DC voltage of all circuit unit operations on the main control board, and the alternating voltage that drives the fluorescent tube in the backlight module.Wherein, power supply device 10 uses three pulse width modulation controlled unit PCU0～PCU2 altogether, and voltage/current is transported to the electronics spare part on backlight module and the main control board.Because voltage transitions must cause impairment and the increase of spare part cost on the voltage/current efficient; Therefore be directed against the electric power system of LCD TV or other electronic products; How to improve voltage/current waste and the expensive phenomenon of voltage/current in transfer process, the target of making great efforts for industry in fact.
Summary of the invention
Therefore, fundamental purpose of the present invention promptly is to provide a kind of power supply method and power supply device that is used for a liquid crystal indicator.
The present invention discloses a kind of power supply device that is used for a liquid crystal indicator, includes an AC adapter, is coupled to an AC power, and being used for changing this AC power is a direct current power supply; One squarer is coupled to this AC adapter, is used for according to this direct supply, to produce one first oscillator signal; One AC voltage is coupled to this squarer, is used to provide the backlight module that an alternating voltage gives this liquid crystal indicator; And a plurality of dc voltage/current modular converters; Be used to provide a plurality of load circuits that a plurality of voltage sources give this liquid crystal indicator; Each dc voltage/current modular converter includes a control circuit, is coupled to this squarer, is used for feedback (feedback) signal according to a corresponding load circuit; Cover this first oscillator signal, to produce one second oscillator signal; One voltage is coupled to this control circuit and this load circuit, is used for converting this second oscillator signal into a voltage source to be supplied to this load circuit; And a feedback control unit, be coupled to this control circuit and this load circuit, be used for producing this feedback signal.
The present invention also discloses a kind of power supply method, is used to provide a voltage source and gives a load circuit, includes to produce one first oscillator signal; According to a feedback signal of this load circuit, cover this first oscillator signal, to produce one second oscillator signal; And convert this second oscillator signal into this voltage source to be supplied to this load circuit.
The present invention also discloses a kind of power supply device, is used to provide a voltage source and gives a load circuit, includes a squarer, produces one first oscillator signal; One control circuit is coupled to this squarer, is used for a feedback signal according to this load circuit, covers this first oscillator signal, to produce one second oscillator signal; One voltage is coupled to this control circuit and this load circuit, is used for converting this second oscillator signal into this voltage source to be supplied to this load circuit; And a feedback control unit, be coupled to this control circuit and this load circuit, be used for producing this feedback signal.
The present invention can use the voltage/current conversion of less number of times, and voltage/current is transported to the spare part that all need power supply, reaches impairment that reduces on the voltage/current efficient and the benefit that reduces the spare part cost.
Description of drawings
Fig. 1 is the block diagram of a power supply device of LCD TV in the known technology.
Fig. 2 A is the function block diagram according to a power supply device that is used for a liquid crystal indicator of the embodiment of the invention.
Fig. 2 B is a block diagram of an AC voltage.
Fig. 2 C is the function block diagram of arbitrary dc voltage/current modular converter among dc voltage/current modular converter 206_1～206_n.
The oscillator signal that Fig. 3 is produced for a squarer according to the present invention and the waveform of the interchange oscillator signal after control circuit covers be synoptic diagram relatively.
Fig. 4 is the synoptic diagram according to power supply supply flow process of the present invention.
Fig. 5 is the function block diagram according to the embodiment of the invention one power supply device.
Fig. 6 A～6B is the circuit diagram according to the power supply device 50 of the embodiment of the invention.
The primary clustering symbol description:
10,20,50 power supply devices
PPU0 master's power supply unit
BLPU0 backlight module power supply unit
MBPU0 governor circuit power supply unit
Acin, BLAC0, BLAC1, ACQin, BLACQ1 alternating current
DCP0～DCP3、DC1～DCN、DCQ0、DCR、DCR_1、DCR_2
Direct current
The RECT0 rectifier filer
PCU0～PCU2 pulse width modulation controlled unit
PWM_S0～PWM_S2 pulse-width signal
PS0～PS1 power stage circuit
DCCU0～DCCUN direct current transducer
The BLM0 backlight module
LOAD_1～LOAD_n, LDR load circuit
ACIU0～ACIU1 alternating-current converter
200 AC adapters
202,502 squarers
204 AC voltage
206_1～206_n dc voltage/current modular converter
BLSWQ0, SW_1～SW_n, 504 control circuits
The BLFBQ0 feedback signal
BLACQ0 exchanges oscillator signal
The VTUQ0 step-up transformer
The BKLT0 fluorescent tube
BLCUQ0, FBCU_1～FBCU_n, 508 feedback control units
EETU_1～EETU_n, 506 voltage
FBS_1～FBS_n, FBR feedback signal
OSC0、OSC_1～OSC_n、QOSC_1～QOSC_n、SQWR、SQWR2、SQWR3
Oscillator signal
VS_1～VS_n, DCR voltage source
MOS_1～MOS_n, MOSR mos field effect transistor
VTU_1～VTU_n, VTRR transformer
FLU_1～FLU_n, FLTRR wave filter
40 power supplys supply flow process
400,402,404,406,408 steps
5040 switches
5042 power output circuits
R1, R2 resistance
The COMP1 comparer
The ZD1 Zener diode
Embodiment
Please refer to Fig. 2 A, Fig. 2 A is the function block diagram according to a power supply device 20 that is used for a liquid crystal indicator of the embodiment of the invention.Power supply device 20 includes an AC adapter 200, a squarer 202, an AC voltage 204 and dc voltage/current modular converter 206_1～206_n.AC adapter 204 includes the rectifying and wave-filtering function, and being used for changing an AC power ACQin is a direct current power supply DCQ0.Preferably, AC power ACQin is general domestic power supply.Secondly, squarer 202 receives the voltage/current that direct supply DCQ0 is provided, and produces an oscillator signal OSC0.Preferably, oscillator signal OSC0 is a sequence square-wave signal.Wherein, the dutycycle of each square-wave signal (duty cycle) is a certain value.In addition; AC voltage 204 is used to provide the backlight module BLM0 that an alternating current BLACQ1 gives liquid crystal indicator, and dc voltage/current modular converter 206_1～206_n then is used to provide load circuit LOAD_1～LOAD_n that direct voltage source VS_1～VS_n gives liquid crystal indicator.
At first, to providing AC voltage to explain to the part of backlight module BLM0, please refer to Fig. 2 B, Fig. 2 B is the synoptic diagram of AC voltage 204.AC voltage 204 includes a control circuit BLSWQ0, a step-up transformer VTUQ0 and a feedback control unit BLCUQ0.Control circuit BLSWQ0 is used for covering oscillator signal OSC0 according to the feedback signal BLFBQ0 of backlight module BLM0, gives step-up transformer VTUQ0 to produce an interchange oscillator signal BLACQ0; The control circuit BLSWQ0 of present embodiment comprises a switch and a power output circuit.Step-up transformer VTUQ0 is used for promoting the alternating current BLACQ1 that the voltage to one that exchanges oscillator signal BLACQ0 is about 1.5 kilovolts (KV), in order to drive the fluorescent tube BKLT0 on the backlight module BLM0.In addition, feedback control unit BLCUQ0 then can produce feedback signal BLFBQ0 according to the electric current through fluorescent tube BKLT0.
From the above; The principle of work of AC voltage 204 can details are as follows: at first; Squarer 202 produces a frequency and is approximately 100～200 kilo hertzs oscillator signal OSC0, and control circuit BLSWQ0 then regulates the number of the square wave that passes through according to the feedback signal BLFBQ0 of feedback control unit BLCUQ0.That is control circuit BLSWQ0 can regulate the energy number that is sent to backlight module BLM0 by squarer 202 according to feedback signal BLFBQ0, and with the size of current according to fluorescent tube BKLT0, whether decision covers oscillator signal OSC0.Secondly, the interchange oscillator signal BLACQ0 after step-up transformer VTUQ0 will regulate upwards promotes its PV becomes alternating current BLACQ1, makes it can drive the fluorescent tube BKLT0 among the backlight module BLM0.In addition, AC voltage 204 utilizes feedback control unit BLCUQ0 to detect to flow through the size of current of fluorescent tube BKLT0, producing feedback signal BLFBQ0, and controls the switching motion of control circuit BLSWQ0 with it.Because the present invention is with oscillator signal OSC0, after adjusting and boosting, directly supplying energy gives fluorescent tube BKLT0, therefore, is compared to the power supply framework of backlight module in the known technology, and the present invention can save most voltage/current switch process.Through relatively careful, in the backlight module power supply unit BLPU0 of known technology, except the step-up transformer PVTU1 with transformer VTUQ0 similar functions will give the reservation, remaining parts all can be omitted.In other words, the part of backlight module BLM0 is given in relevant power supply, and spare parts such as employed pulse width modulation controlled unit PCU1, power stage circuit PS1 and alternating-current converter ACIU0 all can omit in the lump in the known technology, therefore can reduce power consumption and save cost.It should be noted that oscillator signal OSC0 no longer is continuous square-wave waveform after regulating through control circuit BLSWQ0, drive the voltage waveform of backlight lamp tube BKLT0 or also will no longer be continuous square-wave waveform therefore at last by the light signal that fluorescent tube sent.But; Because the square-wave signal number of crested; The ratio of number that is compared to the total sequence square-wave signal is lower, and the distribution of the part of signal crested is comparatively average, through the experiment proof; General human eye can't find different or does not feel like oneself when viewing and admiring the liquid crystal indicator that uses power supply device of the present invention.
Please refer to Fig. 2 C, Fig. 2 C is the function block diagram of arbitrary dc voltage/current modular converter 206_x among dc voltage/current modular converter 206_1～206_n.Dc voltage/current modular converter 206_x includes a control circuit SW_x, a voltage EETU_x and a feedback control unit FBCU_x.Control circuit SW_x covers oscillator signal OSC0 according to a feedback signal FBS_x, to produce an oscillator signal OSC_x.Voltage EETU_x is used for converting oscillator signal OSC_x into a direct current voltage source V S_x, required voltage during with supply load circuit LOAD_x operation.Feedback control unit FBCU_x is used for producing feedback signal FBS_x.Preferably, the magnitude of current that feedback control unit FBCU_x detects through load circuit LOAD_x produces feedback signal FBS_x, and uses control control circuit SW_x and cover oscillator signal OSC0.At last, voltage EETU_x includes a transformer VTU_x and a wave filter FLU_x.Transformer VTU_x is used for the voltage of conversion oscillator signal OSC_x, and to produce an oscillator signal QOSC_x, wave filter FLU_x then is used for converting oscillator signal QOSC_x into direct voltage source VS_x, and is supplied to load circuit LOAD_x to use.
At length say, dc voltage/current modular converter 206_x utilize that squarer 202 produced oscillator signal OSC0, the control circuit SW_x that is comprised via dc voltage/current modular converter 206_x regulates action.That is to say that dc voltage/current modular converter 206_x utilizes the control circuit SW_x that is wherein comprised, regulate by the energy transport of squarer 202 to load circuit LOAD_x.Then, the oscillator signal OSC_x after the adjusting becomes DC voltage VS_x behind transformer VTU_x and wave filter FLU_x.By that analogy, dc voltage/current modular converter 206_1～206_n can produce the required DC voltage VS_1～VS_n of all load circuit LOAD_1～LOAD_n.Be noted that Fig. 2 C is the embodiment synoptic diagram of dc voltage/current modular converter 206_x, those of ordinary skills work as can do different modifications according to this, and is not limited thereto.For instance, control circuit SW_x can be a mos field effect transistor (MOSFET), and its drain electrode, grid and source electrode are respectively coupled to squarer 202, feedback control unit FBCU_x and voltage EETU_x.In addition, preferably, load circuit LOAD_1～LOAD_n representes the interlock circuit assembly of liquid crystal indicator.It should be noted that to be compared to known technology, the pulse width modulation controlled unit PCU2 among the governor circuit power supply unit MBPU0 can save in the present invention, thereby saves part power consumption and cost of parts.
For the convenient waveform of understanding oscillator signal OSC0 and covering front and back, please refer to Fig. 3 through control circuit SW_1～SW_n of control circuit BLSWQ0 or dc voltage/current modular converter 206_1～206_n.The oscillator signal OSC0 that Fig. 3 is produced for squarer 202 and the waveform synoptic diagram of the oscillator signal after control circuit BLSWQ0, SW_1～SW_n cover.Can be understood by Fig. 3, oscillator signal OSC0 will have the voltage/current crested of part, and can't be sent to load after passing through control circuit BLSWQ0, SW_1～SW_n; Wherein, the purpose of shaded portions voltage/current is control output voltage, circuit still can be kept under different loads decide voltage output.
In brief; The oscillator signal that the present invention utilizes squarer to produce; Only regulate the control circuit and a step-up transformer of usefulness through one; Directly supply the fluorescent tube use that AC voltage is given backlight module, and utilize same oscillator signal to convert direct current into, direct current is supplied to the general circuit assembly through simple adjusting and filtering action.Be compared to known technology, the present invention has significantly reduced and has simplified package count and the complexity in the power supply feed lines, and obtains the effect that is equal to known technology.
Via above-mentioned explanation, the function mode of arbitrary dc voltage/current modular converter 206_x can further be summarized power supply supply flow process 40, and is as shown in Figure 4, is used to provide direct voltage source VS_x and gives load circuit LOAD_x.Power supply supply flow process 40 includes following steps:
Step 400: beginning.
Step 402: squarer 202 produces oscillator signal OSC0.
Step 404: according to the feedback signal FBS_x of load circuit LOAD_x, cover oscillator signal OSC0, to produce oscillator signal QOSC_x.
Step 406: convert this oscillator signal QOSC_x into direct voltage source VS_x to be supplied to load circuit LOAD_x.
Step 408: finish.
Power supply supply flow process 40 is in order to the function mode of explanation dc voltage/current modular converter 206_x, and detailed description can not given unnecessary details at this with reference to aforementioned.
Power supply device 20 is used for liquid crystal indicator, provides interchange and direct supply to give backlight module and other electronic packages.Certainly to the part of direct current power supply, the present invention also according to power supply supply flow process 40, provides a direct current power supply device.Please refer to Fig. 5, Fig. 5 is the function block diagram according to a power supply device 50 of the embodiment of the invention.Power supply device 50 includes a squarer 502, a control circuit 504, a voltage 506 and a feedback control unit 508.Squarer 502 is used for producing oscillator signal SQWR.Control circuit 504 is used for covering oscillator signal SQWR according to feedback signal FBR, to produce oscillator signal SQWR2.Voltage 506 is used for converting oscillator signal SQWR2 into a voltage source DCR to be supplied to a load circuit LDR.Feedback control unit 508 is used for detecting the load current among the load circuit LDR, produces feedback signal FBR.Wherein, preferably, oscillator signal SQWR is a sequence square-wave signal, and the dutycycle of each square-wave signal is a certain value; Voltage source DCR preferably is a direct current voltage source.In addition, voltage 506 includes a transformer VTRR and a wave filter FLTRR.Transformer VTRR is used for the voltage level of conversion oscillator signal SQWR2, to produce oscillator signal SQWR3.Wave filter FLTRR then is used for converting oscillator signal SQWR3 into voltage source DCR.
Please refer to Fig. 6 A～6B, Fig. 6 A～6B is the circuit diagram according to the power supply device 50 of the embodiment of the invention.At first, in Fig. 6 A, control circuit 504 includes a switch 5040 and a power output circuit 5042.Preferably, the switch 5040 of control circuit 504 is a mos field effect transistor (MOSFET), and the grid of switch 5040 receives the feedback signal FBR that is exported by feedback control unit 508, is used for covering oscillator signal SQWR.Secondly, control circuit 504 and power output circuit 5042 also are a mos field effect transistor (MOSFET), are used for driving voltage/current conversion unit 506.The wave filter FLTRR that voltage 506 is comprised is an electric capacity, and the transformer VTRR that it comprised is an electric pressure converter (voltage transformer).Feedback control unit 508 includes divider resistance R1, R2, a comparator C OMP1 and a Zener diode (Zener diode) ZD1.Wherein, Zener diode ZD1 is used to provide a stable reference voltage.On the low side when the voltage of load, feedback control unit 508 just can be via feedback signal FBR, the switch 5040 of open control circuit 504; Otherwise the voltage of load is higher, and feedback control unit 508 just can be via feedback signal FBR, and the switch 5040 of closing control circuit 504 covers oscillator signal SQWR.In addition, comparatively succinct for making circuit, the squarer 502 of power supply device 50 is not shown among Fig. 6 A, and about the embodiment and the operation principles of squarer 502, should be well known to those of ordinary skill in the art, so will not give unnecessary details.Secondly; The embodiment of Fig. 6 B and operation principles almost completely are same as the circuit shown in Fig. 6 A; Its unique difference is that the secondary survey (secondary side) of the transformer VTRR of Fig. 6 B includes two voltage output ends, so that supply direct current DCR_1, the DCR_2 of two different magnitudes of voltage.Thus, can further save assembly.
Therefore; Power supply device 50 can be via the oscillator signal SQWR of squarer 502 generations; And, cover the portion waveshape of oscillator signal SQWR according to the feedback signal FBR of load circuit LDR, to regulate the energy that is transported to load circuit LDR by squarer 502.As power supply device 20, power supply device 50 can be simplified the complexity and the cost of feed circuit.
Generally speaking, the present invention can use the voltage/current conversion of less number of times, and voltage/current is transported to the spare part that all need power supply, reaches impairment that reduces on the voltage/current efficient and the benefit that reduces the spare part cost.
The above is merely preferred embodiment of the present invention, and every equivalent variations and modification of being done according to claims scope of the present invention all should belong to covering scope of the present invention.
Claims (21)
1. power supply device that is used for a liquid crystal indicator comprises:
One AC adapter is coupled to an AC power, and being used for changing said AC power is a direct current power supply;
One squarer is coupled to said AC adapter, is used for according to said direct supply, produces one first oscillator signal;
One alternating voltage modular converter is coupled to said squarer, is used to provide the backlight module that an alternating voltage gives said liquid crystal indicator; And
A plurality of DC voltage modular converters are used to provide a plurality of load circuits that a plurality of voltage sources give said liquid crystal indicator, and each DC voltage modular converter comprises:
One control circuit is coupled to said squarer, is used for a feedback signal according to a corresponding load circuit, covers said first oscillator signal, to produce one second oscillator signal;
One voltage conversion unit is coupled to said control circuit and said load circuit, is used for converting said second oscillator signal into a voltage source to be supplied to said load circuit; And
One feedback control unit is coupled to said control circuit and said load circuit, is used for producing said feedback signal.
2. power supply device as claimed in claim 1, wherein said alternating voltage modular converter comprises:
One control circuit comprises one first end, is coupled to said squarer; One second end is coupled to said feedback control unit; And one the 3rd end, be used for a feedback signal according to said backlight module, cover said first oscillator signal, exchange oscillator signal to produce one;
One step-up transformer comprises one first end, is coupled to said control circuit; And one second end, be coupled to said backlight module, be used for promoting the voltage of said interchange oscillator signal, to drive the included fluorescent tube of said backlight module; And
One feedback control unit is coupled to said control circuit and said backlight module, is used for producing said feedback signal.
3. power supply device as claimed in claim 2, wherein said control circuit comprises:
One switch comprises one first end, is coupled to said first end of said control circuit; One second end is coupled to said second end of said control circuit; And one the 3rd end; And
One power output circuit comprises one first end, is coupled to said direct supply; One second end is coupled to said the 3rd end of said switch; And one the 3rd end, be coupled to said the 3rd end of said control circuit.
4. power supply device as claimed in claim 3, wherein said switch are a N type metal oxide semiconductor field effect transistor, and said first end is a drain electrode, and said second end is a grid, and said the 3rd end is an one source pole.
5. power supply device as claimed in claim 3, wherein said power output circuit are a N type metal oxide semiconductor field effect transistor, and said first end is a drain electrode, and said second end is a grid, and said the 3rd end is an one source pole.
6. power supply device as claimed in claim 1, wherein the said control circuit of each DC voltage modular converter comprises:
One switch comprises one first end, is coupled to said first end of said control circuit; One second end is coupled to said second end of said control circuit; And one the 3rd end; And
One power output circuit comprises one first end, is coupled to said direct supply; One second end is coupled to said the 3rd end of said switch; And one the 3rd end, be coupled to said the 3rd end of said control circuit.
7. power supply device as claimed in claim 6, wherein said switch are a N type metal oxide semiconductor field effect transistor, and said first end is a drain electrode, and said second end is a grid, and said the 3rd end is an one source pole.
8. power supply device as claimed in claim 6, wherein said power output circuit are a N type metal oxide semiconductor field effect transistor, and said first end is a drain electrode, and said second end is a grid, and said the 3rd end is an one source pole.
9. power supply device as claimed in claim 1, wherein the said voltage conversion unit of each DC voltage modular converter comprises:
One transformer is used for the voltage of said second oscillator signal of conversion, to produce one the 3rd oscillator signal; And
One wave filter is coupled to said transformer, is used for converting said the 3rd oscillator signal into said voltage source.
10. power supply device as claimed in claim 1, wherein said first oscillator signal are a sequence square-wave signal, and the dutycycle of each square-wave signal is a certain value.
11. power supply device as claimed in claim 1, wherein said voltage source are a direct current voltage source.
12. a power supply method is used to provide a voltage source and gives a load circuit, comprising:
Produce one first oscillator signal;
According to a feedback signal of said load circuit, cover said first oscillator signal, to produce one second oscillator signal; And
Convert said second oscillator signal into said voltage source to be supplied to said load circuit.
13. like the power supply method of claim 12, wherein said first oscillator signal is a sequence square-wave signal, the dutycycle of each square-wave signal is a certain value.
14. like the power supply method of claim 12, wherein said voltage source is a direct current voltage source.
15. a power supply device is used to provide a voltage source and gives a load circuit, comprising:
One squarer produces one first oscillator signal;
One control circuit is coupled to said squarer, is used for a feedback signal according to said load circuit, covers said first oscillator signal, to produce one second oscillator signal;
One voltage conversion unit is coupled to said control circuit and said load circuit, is used for converting said second oscillator signal into said voltage source to be supplied to said load circuit; And
One feedback control unit is coupled to said control circuit and said load circuit, is used for producing said feedback signal.
16. like the power supply device of claim 15, wherein said control circuit comprises:
One switch comprises one first end, is coupled to said first end of said control circuit; One second end is coupled to said second end of said control circuit; And one the 3rd end; And
One power output circuit comprises one first end, is coupled to said direct supply; One second end is coupled to said the 3rd end of said switch; And one the 3rd end, be coupled to said the 3rd end of said control circuit.
17. like the power supply device of claim 16, wherein said switch is a N type metal oxide semiconductor field effect transistor, said first end is a drain electrode, and said second end is a grid, and said the 3rd end is an one source pole.
18. like the power supply device of claim 16, wherein said power output circuit is a N type metal oxide semiconductor field effect transistor, said first end is a drain electrode, and said second end is a grid, and said the 3rd end is an one source pole.
19. like the power supply device of claim 15, wherein said voltage conversion unit comprises:
One transformer is used for the voltage of said second oscillator signal of conversion, to produce one the 3rd oscillator signal; And
One wave filter is coupled to said transformer, is used for converting said the 3rd oscillator signal into said voltage source.
20. like the power supply device of claim 15, wherein said first oscillator signal is a sequence square-wave signal, the dutycycle of each square-wave signal is a certain value.
21. like the power supply device of claim 15, wherein said voltage source is a direct current voltage source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101432849A CN101894527B (en) | 2009-05-22 | 2009-05-22 | Power supply method and power supply device for liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101432849A CN101894527B (en) | 2009-05-22 | 2009-05-22 | Power supply method and power supply device for liquid crystal display device |
Publications (2)
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201017611Y (en) * | 2006-12-01 | 2008-02-06 | 力铭科技股份有限公司 | LCD back light source driving mechanism with isolation type transformer device |
| CN101192069A (en) * | 2006-11-24 | 2008-06-04 | 群康科技(深圳)有限公司 | Multipath DC voltage-stabilizing output circuit |
| CN101315751A (en) * | 2007-05-30 | 2008-12-03 | 奇景光电股份有限公司 | LCD power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101192069A (en) * | 2006-11-24 | 2008-06-04 | 群康科技(深圳)有限公司 | Multipath DC voltage-stabilizing output circuit |
| CN201017611Y (en) * | 2006-12-01 | 2008-02-06 | 力铭科技股份有限公司 | LCD back light source driving mechanism with isolation type transformer device |
| CN101315751A (en) * | 2007-05-30 | 2008-12-03 | 奇景光电股份有限公司 | LCD power supply |
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