CN102195470A - Booster circuit and liquid crystal backlight module - Google Patents
Booster circuit and liquid crystal backlight module Download PDFInfo
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- CN102195470A CN102195470A CN2011100533888A CN201110053388A CN102195470A CN 102195470 A CN102195470 A CN 102195470A CN 2011100533888 A CN2011100533888 A CN 2011100533888A CN 201110053388 A CN201110053388 A CN 201110053388A CN 102195470 A CN102195470 A CN 102195470A
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Abstract
The invention provides a booster circuit, which comprises a power source, a first inductor, a switch, a first diode and an output energy storage capacitor. The anode of the first diode is connected with the positive electrode of the power source via the first inductor; the cathode of the first diode is connected with the negative electrode of the power source via the output energy storage capacitor; one end of the switch is connected with the positive electrode of the power source via the first inductor, and the other end of the switch is connected with the negative electrode of the power source; the output energy storage capacitor is used for outputting stored energy; and the booster circuit also comprises a second inductor which is connected between the first diode and the first inductor. The circuit does not bring increase of element stress when recycling energy, and can reduce electromagnetic interference and improve output efficiency.
Description
Technical field
The present invention relates to booster circuit, relate in particular to a kind of LCD backlight module that has the booster circuit of harmless absorption function and use this booster circuit.
Background technology
Light-emitting diode (LED, Light Emiting Diode) is a kind of novel electric light source, with traditional cold cathode fluorescent lamp pipe (CCFL, Cold Cathode Fluorescent Lamp) light source comparison, it has the light efficiency height, drives advantages such as simple, be called as the 4th generation light source.Along with the application of LED in the LCD backlight module, the LED-backlit colour TV replaces traditional CCFL colour TV backlight just on a large scale, and this has become the trend of industry.But LED is a point-source of light, and obtain large-area effect backlight needs that a lot of lamps are simultaneously luminous just can be realized.Now general way is with some LED power supply that is together in series, and is about to some LED and is welded on series-fed on the striation (light bar), and the benefit of doing like this is to reduce the power supply way, makes things convenient for Control current.Because the output voltage of lcd-tv is generally 24V, and the voltage that a plurality of LED is together in series so just need provide a booster circuit to realize the lifting of supply power voltage up to 60V～200V.
Fig. 1 is existing a kind of booster circuit, it comprises: power supply UI, inductance L 1, K switch 1, diode D1 and output storage capacitor C1, the anode of described diode D1 connects the positive pole of power supply UI by inductance L 1, negative electrode connects the negative pole of power supply UI by output storage capacitor C1, described K switch 1 one ends connect the positive pole of power supply UI by inductance L 1, the other end connects the negative pole of power supply UI, described output storage capacitor C1 is used for energy storage output, striation LB1 is in parallel with output storage capacitor C1 as output loading, is powered by booster circuit.In foregoing circuit, when K switch 1 closure, described inductance L 1 energized UI storage power, when K switch 1 disconnects, described inductance L 1 and power supply UI series connection are given output storage capacitor C1 charging by diode D1 together, give striation LB1 power supply simultaneously, by this, just can control the output voltage (voltage of striation LB1) of booster circuit by changing K switch 1 time scale closed and that turn-off.
But, still there is the shortcoming that can't overcome in above-mentioned booster circuit, promptly when K switch 1 closure, owing to the circuit structure reason, still having electric current among the diode D1 flows through, the voltage that export storage capacitor C1 this moment is added in K switch 1 and diode D1 two ends, can produce reverse recovery loss in circuit, thereby causes K switch 1 and diode D1 heating and produce the electromagnetic interference noise.
Summary of the invention
The object of the present invention is to provide a kind of booster circuit, reducing reverse recovery loss in the existing booster circuit, to improve delivery efficiency, and provide the module backlight of a kind of low electromagnetic interference, high delivery efficiency with harmless absorption function.
Technical scheme of the present invention is as follows:
A kind of booster circuit, comprise: power supply, first inductance, switch, first diode and output storage capacitor, the anode of described first diode connects the positive pole of power supply by first inductance, negative electrode connects the negative pole of power supply by the output storage capacitor, one end of described switch connects the positive pole of power supply by first inductance, the other end connects the negative pole of power supply, described output storage capacitor is used for energy storage output, wherein, described booster circuit also comprises second inductance, and described second inductance is connected between first diode and first inductance.
Described booster circuit, it also comprises second diode, the 3rd diode, first electric capacity and second electric capacity, the anode of described second diode is connected between first inductance and second inductance, negative electrode connects the negative pole of power supply by first electric capacity, the anode of described the 3rd diode is connected between second diode and first electric capacity, and negative electrode connects the anode of described first diode by second electric capacity.
Described booster circuit, it also comprises the 4th diode, and the anode of described the 4th diode is connected between described the 3rd diode and second electric capacity, and negative electrode connects the negative electrode of described first diode.
Described booster circuit, it also comprises output loading, described output loading is in parallel with the output storage capacitor.
Described booster circuit, wherein, described output loading is a striation.
A kind of LCD backlight module, comprise booster circuit and striation, described booster circuit comprises power supply, first inductance, switch, first diode and output storage capacitor, the anode of described first diode connects the positive pole of power supply by first inductance, negative electrode connects the negative pole of power supply by the output storage capacitor, one end of described switch connects the positive pole of power supply by first inductance, the other end connects the negative pole of power supply, described output storage capacitor is used for energy storage output, the acquisition power supply in parallel of described striation with storage capacitor, wherein, described booster circuit also comprises second inductance, and described second inductance is connected between first diode and first inductance.
Described LCD backlight module, wherein, described booster circuit also comprises second diode, the 3rd diode, first electric capacity and second electric capacity, the anode of described second diode is connected between first inductance and second inductance, negative electrode connects the negative pole of power supply by first electric capacity, the anode of described the 3rd diode is connected between second diode and first electric capacity, and negative electrode connects the anode of described first diode by second electric capacity.
Described LCD backlight module, wherein, described booster circuit also comprises the 4th diode, and the anode of described the 4th diode is connected between described the 3rd diode and second electric capacity, and negative electrode connects the negative electrode of described first diode.
Above-mentioned booster circuit, can when switch closure, absorb reverse recovery energy in the circuit by second inductance, limiting reverse recovery current, and by first, energy between second electric capacity and output storage capacitor shifts, when disconnecting, switch absorbs the due to voltage spikes of the leakage inductance energy generation of first inductance, voltage build-up rate when limit switch disconnects, foregoing circuit does not bring the increase of element stress in recuperated energy, can also reduce electromagnetic interference, improve delivery efficiency, and make the module backlight of using foregoing circuit also have low electromagnetic interference, the advantage of high delivery efficiency.
Description of drawings
Fig. 1 is the circuit diagram of existing a kind of booster circuit;
Fig. 2 is the circuit diagram of the preferred embodiment of a kind of booster circuit of the present invention;
Fig. 3 and Fig. 4 are the operation principle schematic diagrames of circuit among Fig. 2;
Fig. 5 is the circuit diagram of a kind of another embodiment of booster circuit of the present invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Figure 2 shows that the preferred embodiment of a kind of booster circuit of the present invention, it comprises: power supply UI, inductance L 2 and L3, K switch 2, diode D2～D5, capacitor C 2 and C3 and output storage capacitor C4.The anode of described diode D4 is connected the positive pole of power supply UI successively with L2 by inductance L 3, negative electrode connects the negative pole of power supply UI by output storage capacitor C4; Described K switch 2 one ends are by the anode of inductance L 2 connection power supply UI, and the other end connects the negative pole of power supply UI; The anode of described diode D2 is connected between inductance L 2 and the L3, and negative electrode connects the negative pole of power supply UI by capacitor C 2; The anode of described diode D3 is connected between diode D2 and the capacitor C 2, and anode connects the anode of diode D4 by capacitor C 3; The anode of described diode D5 is connected between diode D3 and the capacitor C 3, and negative electrode connects the negative electrode of diode D4; Striation LB2 is in parallel with output storage capacitor C4 as output loading, is powered by foregoing circuit.
The operation principle of above-mentioned booster circuit is as follows:
With reference to figure 3, when K switch 2 closures, shown in loop a among the figure, the reverse recovery current of diode D4 is limited its climbing by inductance L 3, is converted into store energy simultaneously in inductance L 3 the insides; When after reverse recovery time, shown in loop b among the figure, inductance L 3 forms loops with K switch 2, capacitor C 3, diode D3 and capacitor C 2, by inductance L 3 stored energys, and the energy of capacitor C 2 is transferred in the capacitor C 3; In addition, shown in loop c among the figure, power supply UI and inductance L 2 and K switch 2 form the loop, and the electric current of inductance L 2 is risen and stored energy.
With reference to figure 4, when K switch 2 disconnected, shown in loop e among the figure, the energy of inductance L 2 was superimposed with power supply UI and at first gives capacitor C 2 chargings by diode D2, makes capacitor C 2 energy storage; Simultaneously, shown in loop f among the figure, the energy of inductance L 3 is superimposed upon inductance L 2 and upward by capacitor C 3 and diode D5 output storage capacitor C4 is charged with power supply U1; After capacitor C 2 chargings were finished, shown in loop g among the figure, the energy of inductance L 2 was superimposed with power supply UI and gives output storage capacitor C4 charging by diode D2, D3 and D5; At last, shown in loop h among the figure, the energy of inductance L 3 is superimposed upon inductance L 2 and goes up by diode D4 output storage capacitor C4 charging with power supply U1.Not only reduced the voltage build-up rate at K switch 2 two ends in this process, thereby reduced the electromagnetic interference that circuit produces, the leakage inductance energy of inductance L 2 also is stored in the capacitor C 2 simultaneously.
In said process, when K switch 2 was closed, capacitor C 2, diode D3, capacitor C 3, inductance L 3 and K switch 2 formed loops and capacitor C 2 and C3 are carried out energy shift, and the energy of capacitor C 2 were transferred in the capacitor C 3 (among Fig. 3 shown in the b of loop); And when K switch 2 disconnects, after the leakage inductance energy absorption of 2 pairs of inductance L 2 of capacitor C is finished, the voltage of capacitor C 2 no longer rises, after this energy of power supply UI and inductance L 2 releases is by inductance L 3, capacitor C 3 and diode D5 form the loop energy transfer are carried out in output, thereby the energy that will transfer to C3 is transferred to output once more, be stored among the output storage capacitor C4 (among Fig. 4 shown in the f of loop), thereby reach the harmless purpose that absorbs of energy, when shifting, finishes this energy, electric current passes through diode D4 again to striation LB2 feed, finish a work period, above repetitive cycling can reach the harmless purpose that absorbs energy and recycle.
Above-mentioned booster circuit can absorb the reverse recovery energy in the circuit when switch closure, limiting reverse recovery current, can absorb simultaneously the switch due to voltage spikes that leakage inductance energy produces when disconnecting again, voltage build-up rate when limit switch disconnects, and above-mentioned energy can finally output to output loading by the transfer between electric capacity and inductance.Do not bring the increase of element stress when the advantage of this circuit is recuperated energy, can reduce interference again, improve delivery efficiency.
It more than is the detailed description that preferred embodiment of the present invention is carried out, but scheme provided by the invention is not limited to this, because main purpose of the present invention is to reduce the reverse recovery loss of diode D4 when K switch 2 closures, for reaching this purpose, as long as on prior art, increase inductance L 3 to absorb the reverse recovery energy in the circuit, particularly, see also Fig. 5 another embodiment for booster circuit of the present invention, it is compared with preferred embodiment, in circuit, omit diode D2～D5 and the capacitor C 2 and the C3 that can further reduce energy loss, only passed through inductance L 3 reverse recovery energy in the absorption circuit when K switch 2 closures.
In addition, because booster circuit is applied to the LCD backlight module, so its output loading is striation LB2 in the preferred embodiment of the present invention, but the type of output loading is not limited to this, can replace output loading according to the practical application of circuit.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection range of claims of the present invention.
Claims (8)
1. booster circuit, comprise: power supply, first inductance, switch, first diode and output storage capacitor, the anode of described first diode connects the positive pole of power supply by first inductance, negative electrode connects the negative pole of power supply by the output storage capacitor, one end of described switch connects the positive pole of power supply by first inductance, the other end connects the negative pole of power supply, described output storage capacitor is used for energy storage output, it is characterized in that, also comprise second inductance, described second inductance is connected between first diode and first inductance.
2. booster circuit according to claim 1, it is characterized in that: also comprise second diode, the 3rd diode, first electric capacity and second electric capacity, the anode of described second diode is connected between first inductance and second inductance, negative electrode connects the negative pole of power supply by first electric capacity, the anode of described the 3rd diode is connected between second diode and first electric capacity, and negative electrode connects the anode of described first diode by second electric capacity.
3. booster circuit according to claim 2 is characterized in that: also comprise the 4th diode, the anode of described the 4th diode is connected between described the 3rd diode and second electric capacity, and negative electrode connects the negative electrode of described first diode.
4. according to the described booster circuit of arbitrary claim in the claim 1 to 3, it is characterized in that: also comprise output loading, described output loading is in parallel with the output storage capacitor.
5. booster circuit according to claim 4 is characterized in that: described output loading is a striation.
6. LCD backlight module, comprise booster circuit and striation, described booster circuit comprises power supply, first inductance, switch, first diode and output storage capacitor, the anode of described first diode connects the positive pole of power supply by first inductance, negative electrode connects the negative pole of power supply by the output storage capacitor, one end of described switch connects the positive pole of power supply by first inductance, the other end connects the negative pole of power supply, described output storage capacitor is used for energy storage output, the acquisition power supply in parallel of described striation with storage capacitor, it is characterized in that described booster circuit also comprises second inductance, described second inductance is connected between first diode and first inductance.
7. LCD backlight module according to claim 6, it is characterized in that: described booster circuit also comprises second diode, the 3rd diode, first electric capacity and second electric capacity, the anode of described second diode is connected between first inductance and second inductance, negative electrode connects the negative pole of power supply by first electric capacity, the anode of described the 3rd diode is connected between second diode and first electric capacity, and negative electrode connects the anode of described first diode by second electric capacity.
8. LCD backlight module according to claim 7, it is characterized in that: described booster circuit also comprises the 4th diode, the anode of described the 4th diode is connected between described the 3rd diode and second electric capacity, and negative electrode connects the negative electrode of described first diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100533888A CN102195470A (en) | 2011-03-04 | 2011-03-04 | Booster circuit and liquid crystal backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100533888A CN102195470A (en) | 2011-03-04 | 2011-03-04 | Booster circuit and liquid crystal backlight module |
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| CN102195470A true CN102195470A (en) | 2011-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011100533888A Pending CN102195470A (en) | 2011-03-04 | 2011-03-04 | Booster circuit and liquid crystal backlight module |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103095128A (en) * | 2012-12-20 | 2013-05-08 | Tcl王牌电器(惠州)有限公司 | Boost topology circuit and power supply boost device |
| CN104052268A (en) * | 2013-03-12 | 2014-09-17 | 富士电机株式会社 | DC voltage conversion circuit |
| CN106782349A (en) * | 2017-01-04 | 2017-05-31 | 深圳市华星光电技术有限公司 | A kind of LED backlight drive circuit and liquid crystal display |
| CN109120142A (en) * | 2018-11-05 | 2019-01-01 | 宁波市北仑临宇电子科技有限公司 | The lossless synchronous absorbing circuit of peak voltage, boosting and step-down switching power supply circuit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5146399A (en) * | 1989-08-14 | 1992-09-08 | Jeff Gucyski | Switching power apparatus having high factor and comprising pair of converter for obtaining fixed or variable output voltage |
| CN1120875A (en) * | 1993-04-06 | 1996-04-17 | 整流器技术太平洋Pty公司 | Snubber |
| CN1457136A (en) * | 2003-03-05 | 2003-11-19 | 艾默生网络能源有限公司 | Low-loss DC/DC booster circuit |
| CN101192792A (en) * | 2006-11-24 | 2008-06-04 | 北京新雷能有限责任公司 | No loss current buffer circuit and its converter circuit |
| CN100459381C (en) * | 2006-04-13 | 2009-02-04 | 康舒科技股份有限公司 | Soft switching power converter circuit |
-
2011
- 2011-03-04 CN CN2011100533888A patent/CN102195470A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5146399A (en) * | 1989-08-14 | 1992-09-08 | Jeff Gucyski | Switching power apparatus having high factor and comprising pair of converter for obtaining fixed or variable output voltage |
| CN1120875A (en) * | 1993-04-06 | 1996-04-17 | 整流器技术太平洋Pty公司 | Snubber |
| CN1457136A (en) * | 2003-03-05 | 2003-11-19 | 艾默生网络能源有限公司 | Low-loss DC/DC booster circuit |
| CN100459381C (en) * | 2006-04-13 | 2009-02-04 | 康舒科技股份有限公司 | Soft switching power converter circuit |
| CN101192792A (en) * | 2006-11-24 | 2008-06-04 | 北京新雷能有限责任公司 | No loss current buffer circuit and its converter circuit |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103095128A (en) * | 2012-12-20 | 2013-05-08 | Tcl王牌电器(惠州)有限公司 | Boost topology circuit and power supply boost device |
| CN103095128B (en) * | 2012-12-20 | 2016-02-03 | Tcl王牌电器(惠州)有限公司 | Boost topology circuit and power boost device |
| CN104052268A (en) * | 2013-03-12 | 2014-09-17 | 富士电机株式会社 | DC voltage conversion circuit |
| CN104052268B (en) * | 2013-03-12 | 2019-03-19 | 富士电机株式会社 | DC voltage converting circuit |
| CN106782349A (en) * | 2017-01-04 | 2017-05-31 | 深圳市华星光电技术有限公司 | A kind of LED backlight drive circuit and liquid crystal display |
| US10397994B2 (en) | 2017-01-04 | 2019-08-27 | Shenzhen China Star Optoelectronics Technology Co., Ltd | LED backlight driving circuit and liquid crystal display |
| US10448468B2 (en) | 2017-01-04 | 2019-10-15 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | LED backlight driving circuit and liquid crystal display |
| CN109120142A (en) * | 2018-11-05 | 2019-01-01 | 宁波市北仑临宇电子科技有限公司 | The lossless synchronous absorbing circuit of peak voltage, boosting and step-down switching power supply circuit |
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Application publication date: 20110921 |