CN201226614Y - Control device for multipath synergic light-modulation system of cold-cathode lamp - Google Patents
Control device for multipath synergic light-modulation system of cold-cathode lampDownload PDFInfo
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- CN201226614Y CN201226614YCNU2008201202886UCN200820120288UCN201226614YCN 201226614 YCN201226614 YCN 201226614YCN U2008201202886 UCNU2008201202886 UCN U2008201202886UCN 200820120288 UCN200820120288 UCN 200820120288UCN 201226614 YCN201226614 YCN 201226614Y
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-NSiliconChemical compound[Si]XUIMIQQOPSSXEZ-UHFFFAOYSA-N0.000description8
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Abstract
Description
Technical field
The utility model relates to a kind of control device of cold cathode lamp light adjusting system, particularly a kind of control device of cold cathode lamp duplex cooperation light adjusting system of the brightness adjustment control that is mainly used in the multichannel cold cathode lamp.
Background technology
The light modulation of prior art cold cathode lamp, adopt the silicon-controlled voltage regulation circuit mostly, brightness by chopping way control cold cathode lamp, as shown in Figure 1, this light modulating device comprises control circuit, silicon-controlled voltage regulation circuit and electronic transformer, and electronic transformer is made of the switch converters that fits together and high frequency transformer two parts.The civil power of input is through the copped wave of silicon-controlled voltage regulation circuit, and the control electronic transformer is realized the cold cathode lamp light modulation.The controllable silicon light modulation process can produce a large amount of Harmonic Interference, and situation is even more serious during large-scale application.In order to reduce Harmonic Interference, prior art adds control device in the circuits for triggering of cold cathode lamp power supply, as shown in Figure 2, adopts optocoupler as control device, control controllable silicon break-make.This device can only be controlled lighting of cold cathode lamp or extinguish, and can't control its brightness.
Summary of the invention
Technical problem to be solved in the utility model is, overcome the defective that prior art exists, provide a kind of and can reduce Harmonic Interference, can carry out the brightness Collaborative Control of multichannel cold cathode lamp again, and be convenient to the control device of the cold cathode lamp duplex cooperation light adjusting system of large-scale application.
The technical scheme in the invention for solving the above technical problem is: the control device of this cold cathode lamp duplex cooperation light adjusting system, its design feature is: comprise control circuit and switch converters, described switch converters is the variable connector converter, described control circuit is single-chip microcomputer or digital circuit, the output of single-chip microcomputer or digital circuit links to each other with the variable connector converter, the output of variable connector converter connects cold cathode lamp, and described variable connector converter and single-chip microcomputer or digital circuit are installed together.The control device of this light adjusting system is the eye storage characteristic that utilizes the people, by at enough little cycle (T1+ T2) in, control cold cathode lamp brightness in the mode of the work duty ratio of the switch converters that changes the controlling and driving cold cathode lamp.Because digital circuits such as single-chip microcomputer, memory all have certain data width, as 8,16,32 etc., the in parallel application then can extend to infinitely, utilize the multi-path digital control signal of single-chip microcomputer or digital circuit output that each road work duty ratio of variable connector converter is carried out duplex cooperation control, the change of each road work duty ratio of variable connector converter, regulate the input power of each corresponding road cold cathode lamp, carry out the collaborative light modulation of multichannel cold cathode lamp.
The control device of the utility model cold cathode lamp duplex cooperation light adjusting system, described variable connector converter is the separated exciting switch converters, the drive signal of described separated exciting switch converters is by the driving transformer transmission of separated exciting switch converters, the output of single-chip microcomputer or digital circuit connects the elementary of driving transformer, the secondary switching device with the separated exciting switch converters of driving transformer is connected, and switching device is connected with cold cathode lamp.
The control device of the utility model cold cathode lamp duplex cooperation light adjusting system, described separated exciting switch converters is a half-bridge converter, its upper and lower half-bridge is connected in the different two-way output of control circuit.Upper and lower half-bridge is driven by the two-way digital controlled signal respectively, can avoid the generation of upper and lower half-bridge common-mode conducting situation.
The control device of the utility model cold cathode lamp duplex cooperation light adjusting system, described variable connector converter using half-bridge converter, half-bridge all is connected in the common driver output of control circuit on it, and each of half-bridge converter half-bridge down is connected in the different output of control circuit.
The control device of the utility model cold cathode lamp duplex cooperation light adjusting system, described variable connector converter using half-bridge converter, half-bridge all is connected in the common driver output of control circuit under it, and half-bridge is connected in the different output of control circuit on each of half-bridge converter.On each of multichannel half-bridge converter or down half-bridge is respectively by the multi-channel drive signal Collaborative Control of control circuit output, and another down or go up half-bridge and adopt the mode of common driver to simplify control circuit, improved control reliability, reduced production cost.
The control device of the utility model cold cathode lamp duplex cooperation light adjusting system, described control circuit contains memory, and single-chip microcomputer or digital circuit are connected with memory.The digital controlled signal of the control variable connector converter work duty ratio of control circuit output is stored in the memory in advance, like this, only needs the control content in the edit file, can reach the purpose of collaborative light modulation.
The utility model compared with prior art has the following advantages: 1, the control device of this light adjusting system is in the enough little cycle, realize the cold cathode lamp light modulation by the work duty ratio that changes switch converters, avoid the Harmonic Interference that controllable silicon copped wave process produces in the prior art light modulation, be beneficial to the raising power grid quality.2, the variable connector converter that multichannel directly is controlled by single-chip microcomputer or digital circuit is set in this control device, utilize the data width of digital circuits such as single-chip microcomputer, memory, realize the duplex cooperation light modulation of cold cathode lamp, in the cold cathode lamp, the structure of extensive control system created condition; Variable connector converter and control circuit are installed together, place in the same controller, the many public part of switch converters can be shared, as power supply, control, driving, protection etc., both improved control efficiency, reduced production and material cost again.3, the control device of this light adjusting system has changed the structure of prior art electronic transformer, takes switch converters and high frequency transformer to install respectively, and is rational in infrastructure, can make the safer convenience of maintenance of cold cathode lamp engineering.Because the cold cathode lamp power supply is the high-frequency and high-voltage device, must be installed in nearby near the cold cathode lamp during use, and cold cathode lamp is installed in application on the higher position more, as roof billboard, building outline line etc., when the cold cathode lamp power supply damages, the maintenance personal must climb up eminence and could change, and not only bothers, and has certain danger.The utility model control device is installed more flimsy relatively switch converters concentratedly in control device, because the cold cathode lamp fault mostly is due to the switch converters damage, thereby when cold cathode lamp breaks down, only need in control device, can finish maintenance, have using value preferably.4, the data control information on this each road of control device variable connector converter is stored in the memory in advance, only need the control content in the edit file, just can make the brightness of each road cold cathode lamp, the bright dark or color cooperation of the image frame pixel of Xian Shiing requires Collaborative Control to regulate convenient practicality as required.
Description of drawings
Fig. 1 is a prior art cold cathode lamp controllable silicon dimmer circuit block diagram.
Fig. 2 is prior art cold cathode lamp controllable silicon dimmer circuit theory diagrams.
Fig. 3 is for adopting the cold cathode lamp duplex cooperation light adjusting system circuit block diagram of embodiment 1 control device.
Fig. 4 is embodiment 1 a switch converters output pulse signal waveform schematic diagram.
Fig. 5 is for adopting the cold cathode lamp duplex cooperation light adjusting system circuit theory diagrams of embodiment 2 control device.
Fig. 6 is the control signal schematic diagram of embodiment 2.
Fig. 7 is for adopting the cold cathode lamp duplex cooperation light adjusting system circuit block diagram of embodiment 3 control device.
Fig. 8 is for adopting the cold cathode lamp duplex cooperation light adjusting system circuit theory diagrams of embodiment 3 control device.
Fig. 9 is for adopting the cold cathode lamp duplex cooperation light adjusting system circuit block diagram of embodiment 4 control device.
Figure 10 is for adopting the cold cathode lamp duplex cooperation light adjusting system circuit block diagram of embodiment 5 control device.
Embodiment
Embodiment 1:
Referring to Fig. 3, the control device of this cold cathode lamp duplex cooperation light adjusting system comprises control circuit and variable connector converter, and the output of control circuit links to each other with the variable connector converter, and the output of variable connector converter connects cold cathode lamp.Cold cathode lamp comprises cold cathode fluorescent lamp and high frequency transformer.Control circuit output control/driving digital signal 1,2 ... n, control the switch converters 1,2 in the variable connector converter respectively ... the work duty ratio of n, switch converters 1,2 ... n controls and drives each self-corresponding high frequency transformer 1,2 respectively simultaneously ... n, high frequency transformer 1,2 ... n controls each self-corresponding cold cathode fluorescent lamp 1,2 ... the input power of n, regulate cold cathode fluorescent lamp 1,2 ... the brightness of n realizes multichannel cold cathode lamp 1,2 ... the collaborative light modulation of n.As shown in Figure 4, the switch converters output frequency is F0, the duration is T1, the intermittent time is T2Driving pulse, in order to driving the high frequency transformer of cold cathode lamp, tempus intercalare, the switch converters failure of oscillation, cold cathode fluorescent lamp is not luminous.Embodiment is by the work duty ratio T of control circuit control break switch converters1/ (T1+ T2), the input power of regulating high frequency transformer, and then regulate the brightness of cold cathode fluorescent lamp, carry out the cold cathode lamp light modulation.When adopting the light adjusting system production of this control device, variable connector converter and control circuit are installed together, and high frequency transformer and the cold cathode fluorescent lamp that drives cold cathode lamp is installed together.
Embodiment 2:
This embodiment variable connector converter using separated exciting switch converters, switch converters comprises driving transformer and switching device, the drive signal of separated exciting switch converters is transmitted by driving transformer, the output of single-chip microcomputer or digital circuit connects the elementary of driving transformer, secondary and the switching device of driving transformer is connected, switching device is connected with high frequency transformer after connecting capacitance, and high frequency transformer connects cold cathode lamp.The embodiment control circuit is furnished with memory, memory is connected with control circuit, the digital controlled signal of the control variable connector converter work duty ratio of control circuit output is stored in the memory in advance, during work, single-chip microcomputer reads the control information in the memory earlier, control each way switch converter in the variable connector converter then according to separately control information, the input power of regulating each road cold cathode lamp.
The upper and lower half-bridge of present embodiment separated exciting half-bridge converter connects the different two-way output of control circuit respectively, is controlled by two-way digital drive signals XA, the XB of control circuit output respectively.Referring to Fig. 5, the output signal XA of control circuit1～XAnThrough capacitor C11～CN1Meet the driving transformer B of variable connector converter11～BN1Primary coil N01～N0nEnd of the same name, N01～N0nOther end ground connection, the output signal XB of control circuit1～XBnThrough capacitor C12～CN2Meet driving transformer B12～BN2Primary coil N011～N0n1End of the same name, N011～N0n1Other end ground connection; Driving transformer B11～BN1Secondary coil N11～NN1Termination triode Tr of the same name1～TrnBase stage, N11～NN1Another termination triode Tr1～TrnEmitter, triode Tr12～TrN2Collector electrode, the capacitance C of cold cathode lamp1～Cn, triode Tr1～TrnCollector electrode meet power supply V+, driving transformer B12～BN2Secondary coil N12～NN2Termination triode Tr of the same name12～TrN2Base stage, N12～NN2The other end, triode Tr12～TrN2Emitter meet power supply V-, high frequency transformer B1～BnThe primary coil two ends meet capacitance C respectively1～CnWith power supply V-, cold cathode fluorescent lamp L1～LnBe connected on high frequency transformer B respectively1～BnSecondary coil on.
During work, work as XA1～XAnDuring for high level, Tr1～TrnConducting, Tr12～TrN2End; Work as XB1～XBnDuring for high level, Tr1～TrnBy, Tr12～TrN2Conducting, each way switch converter of variable connector converter is at XA1～XAn, XB1～XBnThe logical formation of the common driving lower whorl conductance of signal vibrated.The upper and lower half-bridge of each way switch converter drives respectively, and Dead Time T can be set, and as shown in Figure 6, avoids the generation of upper and lower half-bridge common-mode conducting situation.
Embodiment 3:
This embodiment utilizes the separated exciting half-bridge converter only could drive the characteristics of cold cathode lamp under upper and lower half-bridge takes turns the situation of conducting, on it or down half-bridge is set to common driver and gives drive signal all the time, carry out centralized control, like this, control circuit only needs another half-bridge of Collaborative Control along separate routes, be the work duty ratio of controllable switch converter, realize the duplex cooperation light modulation of cold cathode lamp.The employing of common driver mode is simplified control circuit greatly, has both improved functional reliability, has reduced production cost again.Referring to Fig. 7, public control/driving the digital signal of control circuit single-chip microcomputer or digital circuit output, unified centralized control multichannel half-bridge converter 1,2 ... last or the following half-bridge of n, control/driving the digital signal 1 of control circuit single-chip microcomputer or digital circuit output, 2 ... n, control half-bridge converter 1 respectively, 2 ... following or the last half-bridge of among the n another, half-bridge converter 1,2 ... n controls and drives each self-corresponding high frequency transformer 1 respectively simultaneously, 2 ... n, high frequency transformer 1,2 ... n controls each self-corresponding cold cathode fluorescent lamp 1,2 ... the input power of n, regulate cold cathode fluorescent lamp 1,2 ... the brightness of n realizes the collaborative light modulation of multichannel cold cathode lamp.
Adopt the light adjusting system circuit of present embodiment control device to connect referring to Fig. 8, the last half-bridge of the multichannel half-bridge converter of this control device all is connected in the common driver output of control circuit, a common drive signal control by control circuit output, each of half-bridge converter half-bridge down is connected in the different output of control circuit, by the duplex cooperation drive of control circuit output1～drivenControl, thereby the high frequency transformer B of control cold cathode lamp 1～n1～Bn, regulate cold cathode fluorescent lamp L1～LnBrightness.
Half-bridge of multichannel half-bridge converter adopts the control mode of common driver, both kept the advantage that embodiment 2 can be provided with Dead Time, simplified control circuit again, improved control reliability, reduced production cost.
Embodiment 4:
Referring to Fig. 9, the control circuit of the control device of present embodiment cold cathode lamp duplex cooperation light adjusting system contains memory, single-chip microcomputer or digital circuit are carried out common driver to a half-bridge of multichannel half-bridge converter, and the multi-channel drive signal of another half-bridge of control multichannel half-bridge converter is stored in the memory in advance.During work, single-chip microcomputer or digital circuit by address bus and control bus with F0Frequency each road is stored in data D in the memory in advance1～DnRead continuously, making it to form 1～n row frequency is F0, adjacent with common drive signal 180 °, duration and intermittent time depend on and the driving pulse of memory content drive another half-bridge work of each road half-bridge converter.The duration of each road signal, half-bridge converter half-bridge up and down all has drive signal to take turns conducting to form vibration, and cold cathode lamp is bright; During each road signal break, half-bridge converter loses a half-bridge driven failure of oscillations, and cold cathode lamp goes out.The work duty ratio of cold cathode lamp depends on that each road is stored in the data in the memory in advance, only needs the content in the edit file, can realize that 1～n road cold cathode lamp works in coordination with light modulation.
Embodiment 5:
Referring to Figure 10, present embodiment single-chip microcomputer is as different from Example 4 worked by address bus and control bus control storage 1～m.N is the data width of memory among the figure, as 8,16,32 etc., utilizes the data width n of memory to realize the collaborative light modulation of n road cold cathode lamp, can control the collaborative light modulation of n * m road cold cathode lamp with m memory.The control device of the cold cathode lamp duplex cooperation light adjusting system of this structure according to user demand, can carry out the expansion of light adjusting system easily.
The utility model memory has two kinds of connections, the connection of a kind of embodiment as shown in Figure 52, and memory only connects with single-chip microcomputer, and its data are to handle the work of back control variable connector converter by single-chip microcomputer again after being read by single-chip microcomputer; Another kind of then as Fig. 9 and embodiment illustrated in fig. 10 4 and the connection of embodiment 5, single-chip microcomputer or digital circuit are connected with memory by address bus and control bus, the output of memory is connected with the variable connector converter.
Collaborative Control described in the utility model is meant that control circuit controls the variable connector converter simultaneously and can make it by predetermined requirement or style, cooperates output as the bright dark cooperation or the color of image frame pixel; Described " multichannel " refers to more than one the tunnel.
Common driver described in the utility model, be meant that control circuit is defeated by the variable connector converter all the time with each road work independent of duty cycle and adjacent with the Collaborative Control signal 180 ° control signal.
Cold cathode lamp described in the utility model comprises high frequency transformer, capacitance and the cold cathode fluorescent lamp that drives cold cathode fluorescent lamp.
Switch converters described in the utility model, high frequency transformer, capacitance, and single-chip microcomputer or digital circuit, memory all adopt the known technology and the device of the industry.
Claims (6)
1, a kind of control device of cold cathode lamp duplex cooperation light adjusting system, it is characterized in that: comprise control circuit and switch converters, described switch converters is the variable connector converter, described control circuit is single-chip microcomputer or digital circuit, the output of single-chip microcomputer or digital circuit links to each other with the variable connector converter, the output of variable connector converter connects cold cathode lamp, and described variable connector converter and single-chip microcomputer or digital circuit are installed together.
2, the control device of cold cathode lamp duplex cooperation light adjusting system according to claim 1, it is characterized in that: described variable connector converter is the separated exciting switch converters, the drive signal of described separated exciting switch converters is by the driving transformer transmission of separated exciting switch converters, the output of single-chip microcomputer or digital circuit connects the elementary of driving transformer, the secondary switching device with the separated exciting switch converters of driving transformer is connected, and switching device is connected with cold cathode lamp.
3, the control device of cold cathode lamp duplex cooperation light adjusting system according to claim 2 is characterized in that: described separated exciting switch converters is a half-bridge converter, and its upper and lower half-bridge is connected in the different two-way output of control circuit.
4, the control device of cold cathode lamp duplex cooperation light adjusting system according to claim 2, it is characterized in that: described variable connector converter using half-bridge converter, half-bridge all is connected in the common driver output of control circuit on it, and each of half-bridge converter half-bridge down is connected in the different output of control circuit.
5, the control device of cold cathode lamp duplex cooperation light adjusting system according to claim 2, it is characterized in that: described variable connector converter using half-bridge converter, half-bridge all is connected in the common driver output of control circuit under it, and half-bridge is connected in the different output of control circuit on each of half-bridge converter.
6, according to the control device of claim 3 or 4 or 5 described cold cathode lamp duplex cooperation light adjusting systems, it is characterized in that: described control circuit contains memory, and single-chip microcomputer or digital circuit are connected with memory.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201202886UCN201226614Y (en) | 2008-06-24 | 2008-06-24 | Control device for multipath synergic light-modulation system of cold-cathode lamp |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008201202886UCN201226614Y (en) | 2008-06-24 | 2008-06-24 | Control device for multipath synergic light-modulation system of cold-cathode lamp |
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| CN201226614Ytrue CN201226614Y (en) | 2009-04-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104302039A (en)* | 2009-11-17 | 2015-01-21 | 特锐拉克斯有限公司 | Led dimmer control |
- 2008
- 2008-06-24CNCNU2008201202886Upatent/CN201226614Y/ennot_activeExpired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104302039A (en)* | 2009-11-17 | 2015-01-21 | 特锐拉克斯有限公司 | Led dimmer control |
| CN104302039B (en)* | 2009-11-17 | 2016-09-28 | 特锐拉克斯有限公司 | The detection of LED power and control |
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| CF01 | Termination of patent right due to non-payment of annual fee | Granted publication date:20090422 Termination date:20110624 |