CN2698007Y - Controller for power source circuit and electronic circuit used in power supply and display device with said electronic circuit - Google Patents
Controller for power source circuit and electronic circuit used in power supply and display device with said electronic circuit Download PDFInfo
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- CN2698007Y CN2698007Y CN 200420001220 CN200420001220U CN2698007Y CN 2698007 Y CN2698007 Y CN 2698007Y CN 200420001220 CN200420001220 CN 200420001220 CN 200420001220 U CN200420001220 U CN 200420001220U CN 2698007 Y CN2698007 Y CN 2698007Y
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- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 6
- 238000010586 diagram Methods 0.000 description 15
- 230000010349 pulsation Effects 0.000 description 6
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
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Abstract
The utility model relates to a controller for controlling at least two power circuits, which comprises a phase-shift selector for generating a reference signal according to variable input signals, a pulse generator for receiving the reference signal and generating a pulse signal CLK in response to the received reference signal, wherein the reference signal is programmed to indicate the phase-delay amount according to the number of connected CCFL power circuits, the pulse signal is connected with the CCFL power circuits, and accordingly, the operation of the CCFL power circuits is started. The controller is used for controlling the power supply of electronic circuit comprising a plurality of CCFL power circuits and provides phase delay to the electronic circuit. Usually, the electronic circuit is applied to display devices, such as liquid crystal displays, liquid crystal display computers and liquid crystal display televisions.
Description
Technical field
The utility model relates to and being used for to a plurality of loads, for example gives the electronic circuit of a plurality of CCFL (cold-cathode fluorescence lamp) electric, relates to provide the electronic circuit of phase shift to a plurality of loads more specifically.Usually, this applications of electronic circuitry is in display unit, for example LCD, liquid crystal display computer or liquid crystal display television.
Technical background
The CCFL load is widely used in to LCDs (LCD) and provides backlight, provides backlight more particularly for LCD display and LCD TV.Yet one of these traditional application need independently ac/Dc power inverter (DC/AC power inverter) drive each independent CCFL.This application as shown in fig. 1, wherein each CCFL (20,22 ... 24) respectively by an independent DC/AC inverter (10,12 ... 14) power supply, and all DC/AC inverters are all synchronous.Each DC/AC inverter all comprises a conversion AC network and a power driving circuit.This power driving circuit comprises a tuning circuit (resonant tank circuit) that is used for CCFL.The conversion AC Network Synchronization closure/disconnection (ON/OFF) of each inverter.Therefore, a very big pulsation is just arranged on the power line.When the switch closure in the switching network, power supply V
BattTo export a big electric current, and when switch disconnects power supply V
BattThis output current just no longer is provided.Closed and disconnected just causes the noise on the power line of reduction system signal/noise globality in the time of all inverters.
A kind of scheme that reduces above-mentioned pulsation is the filter effect that increases on the power line.But its shortcoming is to have increased circuit size, thereby has increased system cost.
Figure 2 shows that the another kind of available circuit that drives a plurality of CCFL loads, wherein this circuit comprise one be used for driving a plurality of DC/AC inverters (10,12,14 ... 16) and a plurality of CCFL load (10,12,14 ... 16) controller (40).Clock generator (42) in the controller (40) produce a string phase shifted clock signal give each DC/AC inverter (10,12,14 ... 16) produce a phase delay.Because all DC/AC inverters (10,12,14, ... 16) switch closure in the network or between adjacent inverter equal phase shift is arranged all when disconnecting, as shown in Figure 1, the pulsation on the power line effectively is decreased to 1/N, and wherein N is the number of the DC/AC inverter that connected.
But the problem in the circuit shown in Figure 2 is that controller (40) is subject to original load number, in other words, i.e. CCFL load number equal slave controller (40) transmit move to mutually each inverter (10,12,14 ... 16) electric number of lines.Therefore, if CCFL load number changes, the structure of controller (40) also will change.Another shortcoming is that controller (40) needs to produce the N high frequency clock signal doubly that a frequency is a DC/AC inverter operating frequency alone.
The utility model content
The utility model has disclosed a kind of simple controller of simple phase-shift circuit technology, wherein adopting can be according to the inverter number that is connected by user program phase shift or phase delay number, has so just realized a high power, small-sized multiple inverter system cheaply.
The utility model has also disclosed a kind of modified model electronic circuit.This electronic circuit comprises a plurality of CCFL power circuits (for example DC/AC inverter), drives a plurality of CCFL loads, thereby reduces the instantaneous high current pulsation and the noise that cause owing to the switch in the closed and disconnected power circuit simultaneously.This electronic circuit can be applied to a kind of display unit that comprises at least two loads (for example CCFL load).This display unit can be LCD display, LCD TV or LCD computer.
In brief, controller of the present utility model comprises: a phase shift selection device based on a reference signal of variable input signal generation, and this reference signal is programmed for the expression phase-delay quantity based on the CCFL power circuit number that is connected; Thereby with one receive this reference signal and respond the pulse generator that this reference signal that receives produces a pulse signal CLK, this pulse signal links to each other with the CCFL power circuit, thus the work of startup CCFL power circuit.In addition, electronic circuit of the present utility model also provides the phase shift or the phase delay of switch closure/disconnection in the CCFL power circuit that drives the CCFL load, and wherein the phase-delay quantity of each CCFL power circuit progressively increases according to the job order of CCFL power circuit.
According to electronic circuit of the present utility model, the CCFL power circuit that each is connected all comprises a phase delay selector of giving the phase delay programming of CCFL power circuit, and wherein the phase-delay quantity of each CCFL power circuit progressively increases according to the job order of CCFL power circuit.For example, a CCFL power circuit starts (do not have and postpone) at once after receiving pulse signal CLK.The 2nd CCFL power circuit is a preset phase retardation, and a delay cell (Δ T) back after for example starting with respect to a CCFL power circuit starts.The 3rd CCFL power circuit is a preset phase retardation, start after two delay cells after for example starting with respect to a CCFL power circuit, wherein all CCFL power circuits are all by the closed or disconnection of equal phase delay is arranged between the adjacent power circuit.
According to the utility model, the pulsation on the power line is effectively reduced, and this controller and electronic circuit are able to programme and simple in structure, have reduced cost.
Description of drawings
Figure 1 shows that the schematic diagram of the prior art circuits that is used to drive a plurality of CCFL loads, wherein all driven in synchronism CCFL loads of all DC/AC inverters;
Figure 2 shows that the schematic diagram of the prior art circuits that is used to drive a plurality of CCFL loads, wherein this circuit comprises a controller, a plurality of DC/AC inverter, and controller produces a string phase delayed clock signal and gives a plurality of DC/AC inverters;
Fig. 3 (a) is depicted as a kind of electronic circuit block diagram that is used to drive a plurality of CCFL loads of the present utility model;
Fig. 3 (b) is depicted as the electronic circuit block diagram that another kind of the present utility model is used to drive a plurality of CCFL loads;
Figure 4 shows that an input clock of expression DC/AC inverter and the signal of an output clock;
Figure 5 shows that the selector circuit of a demonstration, what wherein link to each other with selector circuit is input as several subsignals, and linking to each other with the DC/AC inverter is output as analog signal;
Figure 6 shows that the input signal that links to each other with selector circuit and the exemplary diagram of corresponding output signal;
Figure 7 shows that the selector circuit of a demonstration, what wherein link to each other with selector circuit is input as analog signal, and linking to each other with the DC/AC inverter is output as analog signal;
Figure 8 shows that the exemplary diagram of the selector circuit shown in Fig. 7;
Figure 9 shows that and comprise a exemplary diagram based on the delay circuit of the DC/AC inverter of the ramp signal of input clock signal generation;
Figure 10 (a) is depicted as the schematic diagram of a delay cell in the utility model;
Figure 10 (b) is depicted as the exemplary view of the delay circuit of the DC/AC inverter that comprises the delay cell shown in Figure 10 (a), and wherein this delay circuit is according to the input clock signal and the output signal work of selector circuit;
Figure 11 (a)-11 (e) is depicted as the demonstration DC/AC inverter that is applied to electronic circuit of the present utility model.
Specific embodiment
Fig. 3 (a) is depicted as a plurality of loads that are used to drive of the present utility model, for example the electronic circuit block diagram of light source load or CCFL load.This electronic circuit comprises a controller
(40) and at least two power circuits (10,12), for example DC/AC inverter.Controller (40) comprises a selector (44) (for example phase shift selection device) and a pulse generator (for example oscillator).
Selector (44) produces a reference signal based on variable input signal, and this reference signal is continuous with at least two power circuits (10,12), thereby represents controlled power circuit number or phase shift number.In other words, if there are four power circuits to be connected, then selector (44) will be exported the reference signal of an expression by four continuous power circuits of variable input signal.Therefore, controlled power circuit can be programmed according to input signal, and need not to change the circuit structure of control circuit (40) and power circuit (10,12).Selector (44) can be the circuit of a digital to analog converter or the output of an analog input numeral.
Pulse generator (46) produces one first pulse signal and this first pulse signal and at least two power circuits (10,12) first power circuit (10) in links to each other, start first power circuit (10) work at least two power circuits (10,12).Then one second pulse signal of this first power circuit output starts a second source circuit (12) work at least two power circuits (10,12).These at least two power circuits (10,12) are connected with a load with a transformer respectively, a for example light source or CCFL load, thereby powering load.
For for simplicity, electronic circuit working condition of the present utility model comprises that with it two power circuits are that example is described below:
Selector (44) at first produces a reference signal according to the input signal that links to each other with selector (44) and gives two power circuits (10,12), and this reference signal is represented controlled power circuit number (the power circuit number is 2 in the present embodiment).Pulse generator (46) then produces one first pulse signal and starts first power circuit (10) work for first power circuit (10).This first power circuit (10) links to each other with first transformer that links to each other with first load, and wherein first load can be for example a light source or a CCFL load, and this first power circuit is controlled the work of first load.One second pulse signal of this first power circuit (10) output starts second source circuit (10) work for second source circuit (12), and wherein second pulse signal has a delay with respect to first pulse signal that sends to first power circuit (10).This second source circuit (12) links to each other with second transformer that links to each other with second load, and wherein second load can be for example a light source or a CCFL load, and this second source circuit is controlled the work of second load.Equally, one the 3rd pulse signal of this second source circuit (12) output carries out second work period for first power circuit (10).The 3rd pulse signal has a delay with respect to second pulse signal that sends to second source circuit (12).First power circuit (10) is then exported one the 4th pulse signal, and wherein the 4th pulse signal has a delay with respect to the 3rd pulse signal that sends to first power circuit (10).Usually, the pulse signal of exporting from last power circuit is promptly as the input pulse signal of first power circuit.
Fig. 3 (b) is depicted as the electronic circuit block diagram that another kind of the present utility model is used to drive a plurality of CCFL loads.In this embodiment, controller (40) comprising: a phase shift selection device (44) based on a reference signal of variable input signal generation, and this reference signal is programmed for the expression phase-delay quantity based on the CCFL power circuit number that is connected; Thereby with one receive this reference signal and respond the pulse generator (46) that this reference signal that receives produces a pulse signal CLK, this pulse signal at least with two CCFL power circuits (11,13) link to each other, thus the work of at least two CCFL power circuits of startup (11,13).
At least two CCFL power circuits (11,13) each the CCFL power circuit in all comprises a phase delay selector (111 or 131) to the phase-delay quantity programming of CCFL power circuit (11 or 13), each CCFL power circuit (11 wherein, 13) phase-delay quantity all progressively increases according to the job order of CCFL power circuit (11,13).For example, a CCFL power circuit (11) starts (do not have and postpone) at once after receiving pulse signal CLK.The 2nd CCFL power circuit (13) is a preset phase retardation, and a delay cell (Δ T) back after for example starting with respect to a CCFL power circuit (11) starts.Equally, the 3rd CCFL power circuit (15) starts after two delay cells after for example starting with respect to a CCFL power circuit (11) a preset phase retardation.Each CCFL power circuit of these at least two CCFL power circuits (11,13) all links to each other with a load with a transformer (for example a light source or a CCFL load), thus powering load.Adopt this configuration, and each power circuit (11,13,15...) all closed or disconnections with identical phase delay.After all power circuits start or stop, repeat the work period again.
According to the utility model, above-mentioned two power circuits (10,12; 11,13) all with identical phase shift or phase delay closure or disconnection.Therefore, the pulsation on the power line is effectively reduced, and circuit programmable and simple in structure has reduced cost.When the number of power circuit was very big, it is particularly evident that advantage of the present utility model will seem.
Electronic circuit of the present utility model can be applied to display equipment, for example LCD display, LCD television set or LCD computer.Except controller, this display equipment also comprises at least two power circuits, at least two transformers, at least two light sources and a display screen.
Figure 4 shows that the input clock of a power circuit and the schematic diagram of clock signal.A time delay is arranged, i.e. Δ T between input clock signal and clock signal.This postpones to produce for a kind of phase-shift delay and by a delay circuit, and this delay circuit will be set forth in the back.
Fig. 5 is the selector circuit (70) of a demonstration, for example a digital to analog converter, the wherein input (60 that links to each other with selector circuit (70), 62,64 ... 66) be digital signal, and with power circuit (10,12 ... 14) output that links to each other is analog signal (Vaa).Input signal that links to each other with selector circuit (70) and corresponding output signal are as shown in Figure 6.For example, if Vaa is 4/16ths, this means that four power circuits are connected; If Vaa is 15/16ths, this means that 15 power circuits are connected.In other words, if the input pin of selector (70) is four, then controlled power circuit can be programmed for 16.
Figure 7 shows that the selector circuit (72) of another kind of demonstration, a scale modeling selector (scaled analogy selector) for example, wherein link to each other with selector circuit be input as an analog signal (Vain) and with power circuit (10,12 ... 14) linking to each other is output as an analog signal (Vaa).Figure 8 shows that the exemplary diagram of the selector circuit shown in Fig. 7 (72), the wherein analog input of Vain presentation selector circuit (72), the simulation output of Vaa presentation selector circuit (72).The value of Vaa can obtain by adopting a kind of stacking method based on Vain, Vref and three resistance (80,82,84) value.Through appropriate selection, value and the Vain of Vaa are proportional, so the value of Vaa just can be used for representing the power circuit number that connected.
Figure 9 shows that the exemplary diagram of a delay circuit in the power circuit, this delay circuit comprises a ramp signal based on input clock signal and reference signal generation.This delay Δ T is produced between each phase place by delay circuit.Fig. 9 also shows a string signal that links to each other with each CCFL, wherein postpones initial point and is produced based on first pulse signal and reference signal by a ramp signal generator.
Figure 10 (a) is depicted as the schematic diagram of a delay cell of the present utility model (92).There is shown clock inlet signal (clock in signal) and clock go out between the signal (clock outsignal) or two adjacent power circuits between the delay Δ T that produces of delay cell.Figure 10 (b) is depicted as the schematic diagram of delay circuit of the power circuit of the delay cell (92) that comprises shown in Figure 10 (a).This delay Δ T depends primarily on reference signal Vaa.At first, when a clock inlet signal in zero-time and delay cell (92) when linking to each other, transistor (93) conducting, voltage Vc reduces to 0 volt.Simultaneously, can turn-off transistor (93) (time-delay beginning) in case the clock inlet signal is reduced to, electric capacity (94) just is higher than Vref by the voltage of electric current I c charging on electric capacity (94).When the voltage on the electric capacity (94) is higher than Vref, comparator (95) will change state and produce a pulse signal (time-delay finish) by electric capacity (96) to next state.Electric current I c depends on the difference of Vaa and Vcc.In an example, Vaa is high more, and then electric current I c is more little and the charging interval is long more.In other words, increased time of delay.In another example, Vaa is high more, and then electric current I c is big more and the charging interval is few more.In other words, reduced time of delay.
Figure 11 (a)-11 (b) is depicted as the demonstration DC/AC inverter of using electronic circuit of the present utility model.Figure 11 (a) is depicted as a full-bridge type DC/AC inverter, Figure 11 (b) is depicted as a semibridge system DC/AC inverter, Figure 11 (c) is depicted as a flyback forward (fly-back forward) formula DC/AC inverter, Figure 11 (d) is depicted as a push-pull type DC/AC inverter, and Figure 11 (e) is depicted as a Class D formula DC/AC inverter.
Although the utility model and its advantage elaborate at this, relevant various variations and replacement do not break away from the defined spirit and scope of claim of the present utility model.
Claims (16)
1. controller that is used for control at least two cold-cathode fluorescence lamps (CCFL) power circuit comprises:
A phase shift selection device that produces a reference signal, described reference signal is programmed for the expression phase-delay quantity based on the described CCFL power circuit number that is connected; With
Thereby one receives described reference signal and responds the pulse generator that the described reference signal that receives produces a pulse signal, described pulse signal links to each other with described two CCFL power circuits at least, thereby starts the work of described at least two CCFL power circuits.
2. controller according to claim 1, wherein said phase shift selection device comprises the input of the CCFL power circuit number that connected of programming at least, with one based on the output that input signal is exported described reference signal that links to each other with described at least one input.
3. controller according to claim 2, described input signal can be an analog signal that is used to select the phase place number, or a digital signal that is used to select the phase place number.
4. electronic circuit that is used for to the CCFL electric comprises:
At least two CCFL power circuits, in described at least two CCFL power circuits each all comprises a phase delay selector to the phase delay programming of described CCFL power circuit, and wherein the described phase-delay quantity of each described CCFL power circuit progressively increases according to the job order of described CCFL power circuit; With
A controller that comprises a phase shift selection device and a pulse generator, described phase shift selection device produces a reference signal based on the described CCFL power circuit number that is connected, described pulse generator receives described reference signal and also responds the described reference signal that receives and produce a pulse signal, described pulse signal links to each other with described two CCFL power circuits at least, thereby starts the work of described at least two CCFL power circuits;
The one CCFL power circuit of wherein said at least two CCFL power circuits starts after receiving described pulse signal at once, and the 2nd CCFL power circuit of described at least two CCFL power circuits starts after a preset phase retardation.
5. electronic circuit according to claim 4, wherein said phase shift selection device comprises the input of the number of the CCFL power circuit that connected of programming at least, with one based on the output that input signal is exported described reference signal that links to each other with described at least one input.
6. electronic circuit according to claim 5, described input signal can be an analog signal that is used to select the phase place number, or a digital signal that is used to select the phase place number.
7. electronic circuit according to claim 4 also comprises a plurality of transformers.
8. electronic circuit according to claim 7 also comprises a plurality of CCFL loads.
9. electronic circuit according to claim 4, wherein said CCFL power circuit also comprise a ramp signal generator that produces described phase delay, and the initial point of described ramp signal generator produces based on described pulse signal.
10. electronic circuit according to claim 4, wherein said CCFL power circuit comprise that also produces the delay circuit that described programmable phase postpones.
11. the display equipment that the CCFL load is arranged comprises:
At least two CCFL power circuits, each of described at least two CCFL power circuits all comprises a phase delay selector to the phase delay programming of described CCFL power circuit, and wherein the described phase-delay quantity of each described CCFL power circuit progressively increases according to the job order of described CCFL power circuit;
A controller that comprises a phase shift selection device and a pulse generator, described phase shift selection device produces a reference signal based on the described CCFL power circuit number that is connected, described pulse generator receives described reference signal and also responds the described reference signal that receives and produce a pulse signal, described pulse signal links to each other with described two CCFL power circuits at least, thereby starts the work of described at least two CCFL power circuits;
At least two transformers, each described transformer all link to each other with described two CCFL power circuits respectively at least;
At least two CCFL loads, each described CCFL load all links to each other with described two transformers respectively at least;
A display screen;
The one CCFL power circuit of wherein said at least two CCFL power circuits starts after receiving described pulse signal at once, thereby connect a CCFL load of described at least two CCFL loads, and the 2nd CCFL power circuit of described at least two CCFL power circuits starts after a preset phase retardation, thereby connects the 2nd CCFL load of described at least two CCFL loads.
12. display equipment according to claim 11, wherein said display equipment can be lcd television set, LCD or liquid crystal display computer.
13. display equipment according to claim 11, wherein said phase shift selection device comprise at least the CCFL power circuit that connected of programming number input with one based on the output that input signal is exported described reference signal that links to each other with described at least one input.
14. display equipment according to claim 13, described input signal can be an analog signal that is used to select the phase place number, or a digital signal that is used to select the phase place number.
15. display equipment according to claim 11, wherein said CCFL power circuit also comprise a ramp signal generator that produces described phase delay, and the initial point of described ramp signal generator produces based on described pulse signal.
16. display equipment according to claim 11, wherein said CCFL power circuit comprise that also produces the delay circuit that described programmable phase postpones.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/348,748 | 2003-01-22 | ||
| US10/348,748 US6778415B2 (en) | 2003-01-22 | 2003-01-22 | Controller electrical power circuit supplying energy to a display device |
| US10844004A | 2004-01-13 | 2004-01-13 | |
| USP108440 | 2004-01-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2698007Y true CN2698007Y (en) | 2005-05-04 |
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ID=34798390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420001220 Expired - Lifetime CN2698007Y (en) | 2003-01-22 | 2004-01-20 | Controller for power source circuit and electronic circuit used in power supply and display device with said electronic circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2698007Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1521924B (en) * | 2003-01-22 | 2010-05-26 | 美国凹凸微系有限公司 | Electrical power circuit for supplying energy, controller of a electronic circuit and drive method and display device with the electronic circuit |
-
2004
- 2004-01-20 CN CN 200420001220 patent/CN2698007Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1521924B (en) * | 2003-01-22 | 2010-05-26 | 美国凹凸微系有限公司 | Electrical power circuit for supplying energy, controller of a electronic circuit and drive method and display device with the electronic circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: YINGSHU CAYMAN CONCAVE CONVEX MICRO INTERNATIONAL Free format text: FORMER OWNER: AMERICA CONCAVE-CONVEX MICROSYSTEM INC. Effective date: 20050923 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20050923 Address after: Cayman Islands (Great Britain) Grand Cayman Patentee after: O2 Micro Internat Ltd. Address before: American California Patentee before: O2 Micro Inc |
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| CX01 | Expiry of patent term |
Expiration termination date: 20140120 Granted publication date: 20050504 |
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| CX01 | Expiry of patent term |