CN2340145Y - Power-supply control apparatus for cold-cathode fluorescent lamp tube - Google Patents
Power-supply control apparatus for cold-cathode fluorescent lamp tube Download PDFInfo
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- CN2340145Y CN2340145Y CN 98204352 CN98204352U CN2340145Y CN 2340145 Y CN2340145 Y CN 2340145Y CN 98204352 CN98204352 CN 98204352 CN 98204352 U CN98204352 U CN 98204352U CN 2340145 Y CN2340145 Y CN 2340145Y
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- 239000003990 capacitor Substances 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 16
- 230000006641 stabilisation Effects 0.000 description 9
- 238000011105 stabilization Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 3
- 230000002950 deficient Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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Abstract
The utility model relates to a power supply control apparatus for a cold cathode fluorescent lamp tube. The utility model relates to the power supply control apparatus for a cold cathode fluorescent lamp tube. The utility model is used on a cold cathode fluorescent lamp tube arranged in an image scanning device. The utility model comprises a fixed direct current voltage supply device, a converter from direct current voltage to alternating current voltage, a switching control circuit and a status selection circuit. The utility model uses the mode that a load capacitance value is changed to respectively control the switching control circuit at the first time interval and provide tube current of the first intensity for the cold cathode fluorescent lamp tube which is in a shutdown state or a stand-by state, which leads the luminance of the cold cathode fluorescent lamp tube to be quickly increased. After the first time interval is finished, the utility model provides tube current of the second intensity for the cold cathode fluorescent lamp tube, which leads the luminance of the fluorescent lamp tube to be stable after the second time interval and to be in a scanning state.
Description
The utility model relates to a kind of power control of cathode fluorescent tube, is meant the power control that is applied to be arranged on the cathode fluorescent tube in the image-scanning device especially.
Image analyzer is a kind of computer peripheral of fast development, the manufactory's commercial city amount of having high input manpower and materials are being improved its functional characteristic, the projection source that image-scanning device used wherein, major part is with cold cathode fluorescent lamp (Cold-Cathode Fluorescent Tube, CCFT) finish, but because cathode fluorescent tube needs through after a while (i.e. so-called stabilization time) from lighting back to brightness stability, generally be approximately several minutes according to the fluorescent tube characteristic, FL-41266 (AE) cathode fluorescent tube that sees also company of power alliance production shown in Figure 1 provides under the tube current (this example is 6 milliamperes (ma)) of a constant intensity curve synoptic diagram that the light briliancy (Brightness) that its fluorescent tube sent changes with ON time after lighting.So the user starts the power supply of image-scanning device from off-mode after, need in a warm-up mode (warm-up mode), to wait for and reach several minutes, after the stabilization time of (this example is approximately 2 minutes), the scanning mode (scanmode) of being allowed for access is carried out scanning motion, so will have a strong impact on the operating efficiency of image-scanning device and delayed sweep speed, can not adapt to the requirement of shortening day by day sweep time, so in order to improve operating efficiency, " the many power control systems of the cold-cathode tube of optical scanner and the method " of Taiwan development, be outside the control of power supplys such as the off-mode of image-scanning device and scanning mode, increase the power supply control of one or more holding states (stand-bymode) again, so just can reduce the useful life of required stabilization time of warming-up and increase cathode fluorescent tube relatively.But above-mentioned technological means is still the tube current of traditional warming-up (warm-up) step of a utilization-constant intensity is provided to carry out light source control, can not actually shorten warming-up required stabilization time.
The purpose of this utility model provides a kind of power control that can solve the cathode fluorescent tube of above-mentioned all prior art means defectives.
The utility model is achieved in that it is applied to be arranged on the cathode fluorescent tube in the image-scanning device, and it comprises following elements: a fixing direct voltage supply, and it is used to provide the direct voltage of a fixed value; Flow to AC voltage convertor always, be electrically connected on this fixedly direct voltage supply, be used for the direct voltage of this fixed value is converted to the alternating voltage output of a constant intensity; One switches control circuit, be electrically connected on this direct current to AC voltage convertor and cathode fluorescent tube, it receives the alternating voltage that this direct current is exported to AC voltage convertor, and to change wherein the mode of load capacitance value provides the tube current of this cathode fluorescent tube one first intensity and the tube current of one second intensity respectively, wherein the tube current of first intensity is greater than the tube current of second intensity; An and state selecting circuit, be electrically connected on this control switching circuit, its output one is switched signal and is used for controlling the tube current that this control switching circuit provides cathode fluorescent tube first intensity that is in off-mode in very first time section, and the tube current of this cathode fluorescent tube second intensity is provided after first period finished, the briliancy of this cathode fluorescent tube was tended towards stability after second period and be in the one scan state.
Wherein this control switching circuit comprises: a single pole multiple throw, be electrically connected on this state selecting circuit and cathode fluorescent tube, and it can adapt to the triggering of switching signal and the two-way contact position; Several capacitors, be electrically connected on single pole multiple throw and this direct current respectively to AC voltage convertor, these capacitors have capacitance not of uniform size respectively, it can adapt to the switching of single pole multiple throw connecting point position and the load capacitance value on the cathode fluorescent tube loop is changed, and then the tube current of this cathode fluorescent tube first intensity and the tube current of second intensity are provided respectively.
Wherein single pole multiple throw is a relay (relay).
Another kind of implementation method of the present utility model is: it is applied to be arranged on the cathode fluorescent tube in the image-scanning device, and it comprises following elements: a fixing direct voltage supply, and it is used to provide the direct voltage of a fixed value; Flow to AC voltage convertor always, be electrically connected on this fixedly direct voltage supply, be used for the direct voltage of this fixed value is converted to the alternating voltage output of a constant intensity; One switches control circuit, be electrically connected on this direct current to AC voltage convertor and cathode fluorescent tube, it receives the alternating voltage that this direct current is exported to AC voltage convertor, and to change wherein the mode of load capacitance value provides the tube current of this cathode fluorescent tube one first intensity and the tube current of one second intensity respectively, wherein the tube current of first intensity is greater than the tube current of second intensity; An and state selecting circuit, be electrically connected on this control switching circuit, its output one is switched signal and is used for controlling the tube current that this control switching circuit provides cathode fluorescent tube first intensity that is in holding state (stand-by mode) in very first time section, the briliancy of cathode fluorescent tube is increased fast, and the tube current of this cathode fluorescent tube second intensity is provided after first period finished, the briliancy of this cathode fluorescent tube was tended towards stability after second period and be in the one scan state.
Wherein control switching circuit comprises: a single pole multiple throw, be electrically connected on this state selecting circuit and cathode fluorescent tube, and it can adapt to the triggering of switching signal and the two-way contact position; Several capacitors, be electrically connected on single pole multiple throw and this direct current respectively to AC voltage convertor, these capacitors have capacitance not of uniform size respectively, it can adapt to the switching of single pole multiple throw connecting point position and the load capacitance value on the cathode fluorescent tube loop is changed, and then the tube current of this cathode fluorescent tube first intensity and the tube current of second intensity are provided respectively.
Wherein single pole multiple throw is a relay.
The utility model is a kind of power control of cathode fluorescent tube, be applied to be arranged on the cathode fluorescent tube in the image-scanning device, it comprises following elements: a fixing direct voltage supply, flow to AC voltage convertor always, one switches a control circuit and a state selecting circuit, it comes to control the tube current that this control switching circuit provides this cathode fluorescent tube first intensity that is in shutdown or holding state in first period respectively in the mode that changes the load capacitance value, the briliancy of this cathode fluorescent tube is increased fast, and the tube current of this cathode fluorescent tube second intensity is provided after first period finished, the briliancy of this fluorescent tube was tended towards stability after second period and be in scanning mode.
Describe the utility model in detail below in conjunction with accompanying drawing.
Fig. 1 be FL-41266 (AE) cathode fluorescent tube that company of power alliance produces after lighting, provide respectively 6 milliamperes with 12 milliamperes tube current under, the briliancy of its fluorescent tube emitted light (Brightness) is with the curve synoptic diagram of ON time variation.
Fig. 2 is that FL-41266 (AE) cathode fluorescent tube that company of power alliance produces provides after lighting under the tube current (i.e. 6 milliamperes tube current) of two constant intensities, the curve synoptic diagram that the briliancy of its fluorescent tube emitted light (Brightness) changes with ON time.
Fig. 3 is the curve synoptic diagram of tube current size with relative value in its of the conducting of cathode fluorescent tube institute in useful life.
Fig. 4 is the functional-block diagram of the utility model preferred embodiment device.
Fig. 5 is the circuit diagram of the utility model preferred embodiment device.
Fig. 6 is by the constant intensity alternating current of direct current to AC voltage convertor 41 control switching circuit that exports to 42, its different size of current that electric capacity presented by different capacitances concern schematic diagram.
Fig. 7 is that the utility model preferred embodiment device applies to the power supply control warming-up program schematic diagram on FL-41266 (AE) cathode fluorescent tube that company of power alliance produces.
Fig. 8 is the switching schematic diagram of FL-41266 (AE) cathode fluorescent tube between off-mode, scanning mode (Scan mode), holding state (stand-by mode) and idle state (idle mode) that company of power alliance produces.
FL-41266 (AE) cathode fluorescent tube of producing referring to company of power alliance shown in Figure 2 provides respectively after lighting under the tube current of 6 milliamperes and 12 milliamperes, and the briliancy of its fluorescent tube emitted light (Brightness) is with the curve synoptic diagram of ON time variation.When the cathode fluorescent tube of this specification carried out warming-up with 6 milliamperes tube current, its briliancy was stable at 2000cd/m after about 120 seconds
2(candela/metre2), and as when carrying out warming-up with 12 milliamperes tube current, its briliancy was stabilized in 4000cd/m after about 60 seconds
2, this shows that the tube current that strengthens the cathode fluorescent tube conducting can effectively shorten warming-up required stabilization time, and briliancy is stable at a high value.
But the curve synoptic diagram of the tube current size that sees also cathode fluorescent tube institute conducting shown in Figure 3 and relative value in its in useful life.Its obviously expression when the tube current of institute's conducting is big more, will seriously shorten its useful life, so how to take into account the reduction warming-up reach required stabilization time and not influence its useful life, the applicant has developed the utility model then.
Functional-block diagram referring to the utility model preferred embodiment device shown in Figure 4.This device comprise one fixedly direct voltage supply 40, flow to AC voltage convertor (DC-AC inverter), control switching circuit 42 and state selecting circuit 43 always.Wherein direct current to AC voltage convertor 41 fixedly the fixedly direct voltage exported of direct voltage supply 40 convert an AC power to and export control switching circuit 42 to, and state selecting circuit 43 is accepted the control of user's triggering or external circuitry and control switching circuit 42 is carried out State Selection and switching, to change the tube current size that control switching circuit 42 exports cathode fluorescent tube 44 to, finish the power supply control action of cathode fluorescent tube by this.
Circuit diagram referring to the utility model preferred embodiment device shown in Figure 5.Wherein control switching circuit 42 is that the high pressure resistant switch that the capacitor that differed by several capacitance size and hilted broadsword of being finished with relay 421 are thrown more is constituted.Again referring to shown in Figure 6 by the constant intensity alternating current of direct current to AC voltage convertor 41 control switching circuit that exports to 42, its different size of current that electric capacity presented by different capacitances concern schematic diagram.Thus graph of a relation as seen, we can switch according to this suitably greater than electric capacity produce the tube current that varies in size, finish the power supply control action of cathode fluorescent tube.
Apply to power supply control warming-up program schematic diagram on FL-41266 (AE) cathode fluorescent tube that company of power alliance produces referring to the utility model preferred embodiment device shown in Figure 7.The glimmering fluorescent tube of cold cathode that we will be in off-mode provides one first intensity (12ma earlier, relay 421 switches to the C1=56pf place) tube current to enter a rapid warming-up state, and after carrying out for first period (16.5 seconds), switch to second intensity (6ma, relay 421 switches to the C2=34.25pf place) tube current carry out the warming-up program, as can be known, so the practice will make the cathode fluorescent tube briliancy of this specification just be stabilized in 2000cd/m after through about 2 seconds behind actual experiment
2(candela/metre2) and enter one scan state (scan mode), foreshortened to 18.5 seconds from commonly used 120 seconds stabilization time that can be successfully that light source control is required like this, even when examining with the scanning quality stability in the practical application, and it is 20 seconds with elongating a little stabilization time, also saved 100 seconds, thoroughly shortened required stabilization time of actual warming-up and do not influence useful life of cathode fluorescent tube than the common practice.
In addition, see also the switching schematic diagram of FL-41266 (AE) cathode fluorescent tube between off-mode, scanning mode (Scan mode), holding state (stand-by mode) and idle state (idle mode) that company of power alliance shown in Figure 8 produces again.
Wherein the program control of state switching is controlled by state selecting circuit 43, and state selecting circuit 43 can be finished by the microprocessor that all has in the image-scanning device.Holding state refers to that then image-scanning device is not after a special time T1 is used, just the tube current with the conducting of cathode fluorescent tube institute switches to one than low value (this example is for switching to 4ma by 6ma), increasing the useful life of cathode fluorescent tube, and can return to scanning mode fast when being convenient to the user and reusing.Then be meant image-scanning device again after a longer special time T2 is not used as for idle state, just the tube current with the conducting of cathode fluorescent tube institute cuts off, to save system's power consumption and to increase useful life of fluorescent tube.The utility model not only can apply on the light source control program that off-mode or idle state switch to scanning mode (S1 as shown in the figure, S2), also can be applicable to switch in the process of scanning mode (S3 as shown in the figure) by holding state, all can effectively shorten the required stand-by period of fluorescent tube warming-up, thoroughly improve the defective of prior art.
Above-mentioned tube current control flow can be finished with circuit shown in Figure 5, and the variation control of its required tube current when reaching each state and switching of mat realizes rapid warming-up, the effect that increases the service life.
Claims (6)
1, a kind of power control of cathode fluorescent tube, it is characterized in that: it is applied to be arranged on the cathode fluorescent tube in the image-scanning device, it comprises following elements: a fixing direct voltage supply, and it is used to provide the direct voltage of a fixed value; Flow to AC voltage convertor always, be electrically connected on this fixedly direct voltage supply, be used for the direct voltage of this fixed value is converted to the alternating voltage output of a constant intensity; One switches control circuit, be electrically connected on this direct current to AC voltage convertor and cathode fluorescent tube, it receives the alternating voltage that this direct current is exported to AC voltage convertor, and to change wherein the mode of load capacitance value provides the tube current of this cathode fluorescent tube one first intensity and the tube current of one second intensity respectively, wherein the tube current of first intensity is greater than the tube current of second intensity; An and state selecting circuit, be electrically connected on this control switching circuit, its output one is switched signal and is used for controlling the tube current that this control switching circuit provides cathode fluorescent tube first intensity that is in off-mode in very first time section, and the tube current of this cathode fluorescent tube second intensity is provided after first period finished, the briliancy of this cathode fluorescent tube was tended towards stability after second period and be in the one scan state.
2, the power control of a kind of cathode fluorescent tube as claimed in claim 1, it is characterized in that: wherein this control switching circuit comprises: a single pole multiple throw, be electrically connected on this state selecting circuit and cathode fluorescent tube, it can adapt to the triggering of switching signal and the two-way contact position; Several capacitors, be electrically connected on single pole multiple throw and this direct current respectively to AC voltage convertor, these capacitors have capacitance not of uniform size respectively, it can adapt to the switching of single pole multiple throw connecting point position and the load capacitance value on the cathode fluorescent tube loop is changed, and then the tube current of this cathode fluorescent tube first intensity and the tube current of second intensity are provided respectively.
3, the power control of a kind of cathode fluorescent tube as claimed in claim 1 is characterized in that: wherein single pole multiple throw is a relay (relay).
4, a kind of power control of cathode fluorescent tube, it is characterized in that: it is applied to be arranged on the cathode fluorescent tube in the image-scanning device, it comprises following elements: a fixing direct voltage supply, and it is used to provide the direct voltage of a fixed value; Flow to AC voltage convertor always, be electrically connected on this fixedly direct voltage supply, be used for the direct voltage of this fixed value is converted to the alternating voltage output of a constant intensity; One switches control circuit, be electrically connected on this direct current to AC voltage convertor and cathode fluorescent tube, it receives the alternating voltage that this direct current is exported to AC voltage convertor, and to change wherein the mode of load capacitance value provides the tube current of this cathode fluorescent tube one first intensity and the tube current of one second intensity respectively, wherein the tube current of first intensity is greater than the tube current of second intensity; An and state selecting circuit, be electrically connected on this control switching circuit, its output one is switched signal and is used for controlling the tube current that this control switching circuit provides cathode fluorescent tube first intensity that is in holding state (stand-by mode) in very first time section, the briliancy of cathode fluorescent tube is increased fast, and the tube current of this cathode fluorescent tube second intensity is provided after first period finished, the briliancy of this cathode fluorescent tube was tended towards stability after second period and be in the one scan state.
5, the power control of a kind of cathode fluorescent tube as claimed in claim 1, it is characterized in that: wherein control switching circuit comprises: a single pole multiple throw, be electrically connected on this state selecting circuit and cathode fluorescent tube, it can adapt to the triggering of switching signal and the two-way contact position; Several capacitors, be electrically connected on single pole multiple throw and this direct current respectively to AC voltage convertor, these capacitors have capacitance not of uniform size respectively, it can adapt to the switching of single pole multiple throw connecting point position and the load capacitance value on the cathode fluorescent tube loop is changed, and then the tube current of this cathode fluorescent tube first intensity and the tube current of second intensity are provided respectively.
6, the power control of a kind of cathode fluorescent tube as claimed in claim 1 is characterized in that: wherein single pole multiple throw is a relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98204352 CN2340145Y (en) | 1998-05-07 | 1998-05-07 | Power-supply control apparatus for cold-cathode fluorescent lamp tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98204352 CN2340145Y (en) | 1998-05-07 | 1998-05-07 | Power-supply control apparatus for cold-cathode fluorescent lamp tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2340145Y true CN2340145Y (en) | 1999-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98204352 Expired - Lifetime CN2340145Y (en) | 1998-05-07 | 1998-05-07 | Power-supply control apparatus for cold-cathode fluorescent lamp tube |
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| Country | Link |
|---|---|
| CN (1) | CN2340145Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100346670C (en) * | 2002-10-21 | 2007-10-31 | 达方电子股份有限公司 | Voltage supply circuit of multiple lamp tubes |
| CN1933694B (en) * | 2005-09-13 | 2010-07-14 | 昂宝电子（上海）有限公司 | Multifunction protection driver system and method for cold-cathode and external electrode fluorescence lamp |
-
1998
- 1998-05-07 CN CN 98204352 patent/CN2340145Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100346670C (en) * | 2002-10-21 | 2007-10-31 | 达方电子股份有限公司 | Voltage supply circuit of multiple lamp tubes |
| CN1933694B (en) * | 2005-09-13 | 2010-07-14 | 昂宝电子（上海）有限公司 | Multifunction protection driver system and method for cold-cathode and external electrode fluorescence lamp |
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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: YUDONG OPTICAL CO., LTD. Free format text: FORMER OWNER: HONGYOU SCIENCE AND TECHNOLOGY CO LTD Effective date: 20070105 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20070105 Address after: Delaware Patentee after: Hongyou Science & Technology Co., Ltd. Address before: Hsinchu Science Park in Taiwan province R & D two, No. 25 Chen Wencong turn Patentee before: Hongyou Science and Technology Co., Ltd. |
|
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |