CN1581664A - Driving circuit and method for three-phase current thansformer - Google Patents
Driving circuit and method for three-phase current thansformer Download PDFInfo
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- CN1581664A CN1581664A CNA031531830A CN03153183A CN1581664A CN 1581664 A CN1581664 A CN 1581664A CN A031531830 A CNA031531830 A CN A031531830A CN 03153183 A CN03153183 A CN 03153183A CN 1581664 A CN1581664 A CN 1581664A
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Abstract
Drive circuit includes three switch subassemblies and a three-phase transformer. The three switch subassemblies are connected between an input voltage and a reference electric potential. Each switch subassembly includes a high position switch component and cascaded low position switch component. On/off of each switch component is controlled in order to generate three phases AC voltage at first side of three-phase transformer. The said three-phase AC voltage is transferred by three-phase transformer to first, second and third AC currents to three loads.
Description
Technical field
The present invention relates to a kind of drive circuit and method, particularly a kind of driving three-phase cold-cathode fluorescence lamp (coldcathode fluorescent lamp; The drive circuit of 3-phase power converter CCFL) and method.
Background technology
Cold-cathode fluorescence lamp has low, the low heating of power saving, consumed power, the life-span is long, size is tiny, light weight, high briliancy (illumination), high color rendering and use advantages such as lamp hole temperature is moderate for a long time, so be used to be used as the light source of backlight type display widely, in particular as the light source of backlight liquid crystal displays.It is former because the size of display is less, so it is only must a cold-cathode fluorescence lamp just enough, yet, because development of technology now, the size of display is more and more big, so need a plurality of cold-cathode fluorescence lamps to be used as light source, therefore, also need a kind of circuit that can drive a plurality of cold-cathode fluorescence lamps.
At U.S. Patent number 6,396,722 propose a kind of drive circuit, and it utilizes four MOS transistor and a transformer to form a full-bridge type (full bridge) circuit and drives cold-cathode fluorescence lamp, yet, this circuit can only drive a cold-cathode fluorescence lamp, if will drive a plurality of cold-cathode fluorescence lamps, then must use and organize independently that full bridge circuit drives more, moreover, because employed MOS transistor of this circuit and transformer are expensive element, therefore use and the more organize the high cost of to heal.
Therefore, a kind of drive circuit that can drive a plurality of cold-cathode fluorescence lamps and can reduce cost is to be the institute Ji.
Summary of the invention
Technical problem to be solved by this invention is at the above-mentioned deficiency of prior art, to provide a kind of drive circuit and method of the 3-phase power converter that can drive a plurality of cold-cathode fluorescence lamps and can reduce cost.
The drive circuit of 3-phase power converter of the present invention is realized by following technical scheme.
A kind of drive circuit of 3-phase power converter is characterized in that comprising:
One first switch module comprises one first high-order side switch element and is connected between an input voltage and the first node, and one first low level side switch element is connected between this first node and the reference potential;
One second switch assembly comprises one second high-order side switch element and is connected between this input voltage and the Section Point, and one second low level side switch element is connected between this Section Point and the reference potential:
One the 3rd switch module comprises one the 3rd high-order side switch element and is connected between this input voltage and one the 3rd node, and one the 3rd low level side switch element is connected between the 3rd node and the reference potential; And
One three-phase transformer, its first side have three end points and connect this first, second and third node respectively, and its second side has three end points and connects one first, 1 second and 1 the 3rd load respectively;
Wherein, the controlled unlatching of these switch elements and closed between this first and second node, to produce one first alternating voltage respectively, produce between this second and third node one second alternating voltage and the 3rd and first node between produce one the 3rd alternating voltage, and produced one first alternating current to this first load by this three-phase transformer conversion, one second alternating current is to this second load, and one the 3rd alternating current is to the 3rd load.
The drive circuit of described 3-phase power converter is characterized in that: this three-phase transformer comprises two transformer serial connections.
The drive circuit of described 3-phase power converter is characterized in that: this three-phase transformer comprises that three transformers connect in the Y-Y mode.
The drive circuit of described 3-phase power converter is characterized in that: this three-phase transformer comprises that three transformers connect in Δ-Δ mode.
The drive circuit of described 3-phase power converter is characterized in that: the phase place of this first, second and third alternating voltage respectively differs 120 degree.
The drive circuit of described 3-phase power converter is characterized in that: the phase place of this first, second and third alternating current respectively differs 120 degree.
The drive circuit of described 3-phase power converter is characterized in that: each this switch element diode in parallel.
The drive circuit of described 3-phase power converter is characterized in that: these high-order sides and low level side switch element are nmos pass transistors.
The drive circuit of described 3-phase power converter is characterized in that: this input voltage is a direct current voltage.
The drive circuit of described 3-phase power converter is characterized in that: each this load comprises at least one cold-cathode fluorescence lamp.
The present invention also provides a kind of driving method of 3-phase power converter, it is characterized in that comprising the following steps:
Connect one first switch module between an input voltage and a reference potential, it comprises one first high-order side switch element and is connected in series one first low level side switch element;
Connect a second switch assembly between this input voltage and reference potential, it comprises one second high-order side switch element and is connected in series one second low level side switch element;
Connect one the 3rd switch module between this input voltage and reference potential, it comprises one the 3rd high-order side switch element and is connected in series one the 3rd low level side switch element;
Control these high-order sides and low level side switch element unlatching and closed with difference
Between this first and second node, produce one first alternating voltage,
Between this second and third node, produce one second alternating voltage,
The 3rd and first node between produce one the 3rd alternating voltage;
And
Change this first to the 3rd alternating voltage and produce first load of one first alternating current to, second load of one second alternating current to, and the 3rd load of one the 3rd alternating current to.
The driving method of described 3-phase power converter is characterized in that: comprise that more the phase place of controlling each this alternating voltage respectively differs 120 degree.
The driving method of described 3-phase power converter is characterized in that: comprise that more the initial position of controlling each this alternating current respectively differs 120 degree.
The driving method of described 3-phase power converter is characterized in that: more comprise with this first to the 3rd alternating current respectively promoting at least one cold-cathode fluorescence lamp.
The present invention also provides the driving method of another kind of 3-phase power converter, it is characterized in that comprising the following steps:
Utilize a 3-phase power converter to produce three-phase alternating voltage;
Utilize a three-phase transformer to change this three-phase alternating voltage to produce three-phase alternating current; And
Utilize this three-phase alternating current respectively to promote at least one cold-cathode fluorescence lamp.
The driving method of described 3-phase power converter is characterized in that: comprise that more it is 120 degree that this three-phase alternating voltage of control has a phase difference each other.
The driving method of described 3-phase power converter is characterized in that: comprise that more the phase place of controlling this three-phase alternating current respectively differs 120 degree.
According to the present invention, a kind of drive circuit of 3-phase power converter comprises one first switch module, comprising one first high-order side switch element is connected between an input voltage and the first node, and one first low level side switch element is connected between this first node and the reference potential, one second switch assembly, comprise that one second high-order side switch element is connected between this input voltage and the Section Point and one second low level side switch element is connected between this Section Point and the reference potential, one the 3rd switch module, comprising one the 3rd high-order side switch element is connected between this input voltage and one the 3rd node, and one the 3rd low level side switch element is connected between the 3rd node and the reference potential, an and three-phase transformer, its first side have three end points connect respectively this first, second and third node, its second side have three end points and connect first respectively, second and third load.Control the unlatching of these switch elements and closed between this first and second node, to produce one first alternating voltage respectively, between this second and third node, produce one second alternating voltage, and the 3rd and first node between produce one the 3rd alternating voltage, this three-phase transformer is changed this first to the 3rd alternating voltage to produce first to the 3rd alternating current to this three load, and wherein each load comprises at least one cold-cathode fluorescence lamp.
The invention has the advantages that:
The present invention has lacked 6 nmos pass transistors and a transformer than known drive circuit, so can reduce cost greatly.
For purpose of the present invention, feature and effect thereof are had further understanding, enumerate specific embodiment now and be described with reference to the accompanying drawings as follows:
Description of drawings
Fig. 1 is the drive circuit figure of 3-phase power converter of the present invention.
Fig. 2 is the sequential chart of voltage waveform between node among Fig. 1 [A, B], [B, the C] and [C, A].
Fig. 3 is the sequential chart of three cold-cathode fluorescent lamp current waveform of flowing through among Fig. 1.
Fig. 4 is another embodiment of the present invention drive circuit figure.
Fig. 5 is the another embodiment of the present invention drive circuit.And
Fig. 6 is application implementation figure of the present invention.
Embodiment
Fig. 1 is the preferred embodiment of the drive circuit 10 of 3-phase power converter, it comprises that a switch module 12 is connected between input voltage vin and the reference potential GND1, it comprises a high-order side nmos pass transistor 122 and is connected between input voltage vin and the node A, and a low level side nmos pass transistor 124 is connected between node A and the reference potential GND1; One switch module 14 is connected between input voltage vin and the reference potential GND1, and it comprises a high-order side nmos pass transistor 142 and is connected between input voltage vin and the Node B, and a low level side nmos pass transistor 144 is connected between Node B and the reference potential GND1; One switch module 16 is connected between input voltage vin and the reference potential GND1, it comprises a high-order side nmos pass transistor 162 and is connected between input voltage vin and the node C, and a low level side nmos pass transistor 164 is connected between node C and the reference potential GND1, diode D1～D6 is nmos pass transistor 122～164 in parallel respectively, one three-phase transformer 18 that forms by transformer T1 and T2 serial connection, its first side connected node A, B and C, and three cold- cathode fluorescence lamps 20,22 and 24 are connected between three-phase transformer 18 second sides and the reference potential GND2.Herein, nmos pass transistor 122,124,142,144,162 and 164 all is used as switch element, and is controlled by signal S1, S2, S3, S4, S5 and S6 respectively.
The waveform 26,28 and 30 of Fig. 2 is respectively the VBC between voltage VAB, Node B and the C between the node A and B and the waveform of the VCA between node C and the A among Fig. 1, and this three-phase alternating voltage is phase phasic difference 120 degree each other.Simultaneously with reference to Fig. 1, during the time is 0 to t1, transistor 124,144 and 162 is opened conducting electric current I CA and ICB, open at t1 transistor 122,144 and 162 during the t2, conducting electric current I AB and ICB, during the t3, transistor 122,144 and 164 is opened conducting electric current I AB and IAC at t2, at t3 during the t4, transistor 122,142 and 164 is opened, and conducting electric current I AC and IBC open at t4 transistor 124,142 and 164 during the t5, conducting electric current I BA and IBC, during the t6, transistor 124,142 and 162 is opened conducting electric current I BA and ICA at t5.Wherein, the alternating voltage VAB that between node [A, B], forms, at node [B, C] between the alternating voltage VBC that forms, and the alternating voltage VCA that forms between node [C, A] produces alternating current I1, I2 and I3 to fluorescent tube 20,22 and 24 through three-phase transformer 18 conversions.
As shown in Figure 2,0 to t6 is one-period, so each time interval (for example, 0 to t1) is the sixth cycle, can find out that therefore the voltage waveform 26,28 of present embodiment and 30 phase place respectively differ 120 degree.Waveform 32,34 and 36 is respectively the waveform of alternating current I1, I2 and I3 among Fig. 1 among Fig. 3, and as previously mentioned, current waveform 32,34 and 36 phase place also respectively differ 120 degree.
Known three-phase transformer is to be made of three transformers, but, by the principle of three-phase circuit as can be known, reduce the generation that a transformer does not influence this three-phase current, so present embodiment uses two transformer T1 and T2 serial connection to constitute three-phase transformer 18 to reduce cost.U.S. Patent number 6,396,722 drive circuits that proposed are if will drive three cold-cathode fluorescence lamps, three groups of identical drive circuits then need be arranged, so need 12 nmos pass transistors and three transformers, review the present invention, only must 6 nmos pass transistors and two transformers if will drive three cold-cathode fluorescence lamps, 6 nmos pass transistors and a transformer have been lacked than known drive circuit, so can reduce cost greatly.
Fig. 4 is the second embodiment of the present invention, this drive circuit 38 is similar to the drive circuit 10 of Fig. 1, but three-phase transformer 18 is used Δ-Δ instead) connect, that is the contact 1804 of transformer TX1 first side connects an end 1806 of transformer TX2 first side, the other end 1808 of transformer TX2 first side is connected to an end 1810 of transformer TX3 first side, the other end 1812 of transformer TX3 first side is connected to the contact 1802 of transformer TX1 first side, and the contact 1816 of transformer TX1 second side connects an end 1818 of transformer TX2 second side, the other end 1820 of transformer TX2 second side is connected to an end 1822 of transformer TX3 second side, the other end 1824 of transformer TX3 second side is connected to the contact 1814 of transformer TX1 second side, wherein contact 1802,1806 and 1810 difference connected node A, B and C, and contact 1814,1818 and 1822 connect cold-cathode fluorescence lamp 20 respectively, 22 and 24.This embodiment can reduce the cost of 6 nmos pass transistors.
Fig. 5 is the third embodiment of the present invention, this drive circuit 40 is similar to the circuit 38 of Fig. 4, but three-phase transformer 18 is used the Y-Y mode instead and is connected, that is three-phase transformer 18 is to be connected to form in the Y-Y mode by three transformers, transformer TX1, one end 1802 of TX2 and TX3 first side, 1806 and 1810 difference connected node A, B and C, the other end 1804,1808,1812 are connected to reference potential GND3, and transformer TX1, one end 1814 of TX2 and TX3 second side, 1818 and 1822 connect cold-cathode fluorescence lamp 20 respectively, 22 and 24, the other end 1816,1820 and 1824 are connected to reference potential GND4.This embodiment and drive circuit 38 can reduce the cost of 6 nmos pass transistors equally.
If will drive the cold-cathode fluorescence lamp more than three, can be at the cold-cathode fluorescence lamp in foregoing circuit 10,38 and 40 20,22 and 24 other a plurality of cold-cathode fluorescence lamps 202,222 and 242 in parallel, shown in the circuit 42 of Fig. 6.
More than the narration done for preferred embodiment of the present invention be accurately to be disclosed form for the purpose of illustrating is not intended to limit the present invention, based on above instruction or to make an amendment or change from embodiments of the invention study be possible, embodiment has the knack of this operator and utilizes the present invention to select in practical application with various embodiment and narrate for explaining orally principle of the present invention and allowing, and technological thought of the present invention is decided by claim scope and equalization thereof.
Claims (17)
1, a kind of drive circuit of 3-phase power converter is characterized in that comprising:
One first switch module comprises one first high-order side switch element and is connected between an input voltage and the first node, and one first low level side switch element is connected between this first node and the reference potential;
One second switch assembly comprises one second high-order side switch element and is connected between this input voltage and the Section Point, and one second low level side switch element is connected between this Section Point and the reference potential:
One the 3rd switch module comprises one the 3rd high-order side switch element and is connected between this input voltage and one the 3rd node, and one the 3rd low level side switch element is connected between the 3rd node and the reference potential; And
One three-phase transformer, its first side have three end points and connect this first, second and third node respectively, and its second side has three end points and connects one first, 1 second and 1 the 3rd load respectively;
Wherein, the controlled unlatching of these switch elements and closed between this first and second node, to produce one first alternating voltage respectively, produce between this second and third node one second alternating voltage and the 3rd and first node between produce one the 3rd alternating voltage, and produced one first alternating current to this first load by this three-phase transformer conversion, one second alternating current is to this second load, and one the 3rd alternating current is to the 3rd load.
2, the drive circuit of 3-phase power converter according to claim 1 is characterized in that: this three-phase transformer comprises two transformer serial connections.
3, the drive circuit of 3-phase power converter according to claim 1 is characterized in that: this three-phase transformer comprises that three transformers connect in the Y-Y mode.
4, the drive circuit of 3-phase power converter according to claim 1 is characterized in that: this three-phase transformer comprises that three transformers connect in Δ-Δ mode.
5, the drive circuit of 3-phase power converter according to claim 1 is characterized in that: the phase place of this first, second and third alternating voltage respectively differs 120 degree.
6, the drive circuit of 3-phase power converter according to claim 1 is characterized in that: the phase place of this first, second and third alternating current respectively differs 120 degree.
7, the drive circuit of 3-phase power converter according to claim 1 is characterized in that: each this switch element diode in parallel.
8, the drive circuit of 3-phase power converter according to claim 1 is characterized in that: these high-order sides and low level side switch element are nmos pass transistors.
9, the drive circuit of 3-phase power converter according to claim 1 is characterized in that: this input voltage is a direct current voltage.
10, the drive circuit of 3-phase power converter according to claim 1 is characterized in that: each this load comprises at least one cold-cathode fluorescence lamp.
11, a kind of driving method of 3-phase power converter is characterized in that comprising the following steps:
Connect one first switch module between an input voltage and a reference potential, it comprises one first high-order side switch element and is connected in series one first low level side switch element;
Connect a second switch assembly between this input voltage and reference potential, it comprises one second high-order side switch element and is connected in series one second low level side switch element;
Connect one the 3rd switch module between this input voltage and reference potential, it comprises one the 3rd high-order side switch element and is connected in series one the 3rd low level side switch element;
Control these high-order sides and low level side switch element unlatching and closed with difference
Between this first and second node, produce one first alternating voltage,
Between this second and third node, produce one second alternating voltage,
The 3rd and first node between produce one the 3rd alternating voltage;
And
Change this first to the 3rd alternating voltage and produce first load of one first alternating current to, second load of one second alternating current to, and the 3rd load of one the 3rd alternating current to.
12, the driving method of 3-phase power converter according to claim 11 is characterized in that: comprise that more the phase place of controlling each this alternating voltage respectively differs 120 degree.
13, the driving method of 3-phase power converter according to claim 11 is characterized in that: comprise that more the initial position of controlling each this alternating current respectively differs 120 degree.
14, the driving method of 3-phase power converter according to claim 11 is characterized in that: more comprise with this first to the 3rd alternating current respectively promoting at least one cold-cathode fluorescence lamp.
15, a kind of driving method of 3-phase power converter is characterized in that comprising the following steps:
Utilize a 3-phase power converter to produce three-phase alternating voltage;
Utilize a three-phase transformer to change this three-phase alternating voltage to produce three-phase alternating current; And
Utilize this three-phase alternating current respectively to promote at least one cold-cathode fluorescence lamp.
16, the driving method of 3-phase power converter according to claim 15 is characterized in that: comprise that more it is 120 degree that this three-phase alternating voltage of control has phase difference each other.
17, the driving method of 3-phase power converter according to claim 15 is characterized in that: comprise that more the phase place of controlling this three-phase alternating current respectively differs 120 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031531830A CN100444508C (en) | 2003-08-08 | 2003-08-08 | Driving circuit and method for three-phase current thansformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031531830A CN100444508C (en) | 2003-08-08 | 2003-08-08 | Driving circuit and method for three-phase current thansformer |
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| Publication Number | Publication Date |
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| CN1581664A true CN1581664A (en) | 2005-02-16 |
| CN100444508C CN100444508C (en) | 2008-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB031531830A Expired - Fee Related CN100444508C (en) | 2003-08-08 | 2003-08-08 | Driving circuit and method for three-phase current thansformer |
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| CN (1) | CN100444508C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102123549A (en) * | 2010-12-31 | 2011-07-13 | 东莞市创业电气设备有限公司 | Streetlamp driving circuit and streetlamp |
| CN104822212A (en) * | 2014-12-12 | 2015-08-05 | 武汉绿鼎天舒科技发展有限公司 | High-reliability dual-purpose desk lamp |
| CN104822213A (en) * | 2014-12-12 | 2015-08-05 | 武汉绿鼎天舒科技发展有限公司 | Illuminating device with adjustable brightness |
| CN104837279A (en) * | 2014-12-12 | 2015-08-12 | 武汉绿鼎天舒科技发展有限公司 | High-reliability storage desk lamp |
| CN104968066A (en) * | 2014-12-12 | 2015-10-07 | 武汉绿鼎天舒科技发展有限公司 | Telescopic lighting device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6259615B1 (en) * | 1999-07-22 | 2001-07-10 | O2 Micro International Limited | High-efficiency adaptive DC/AC converter |
| GB0007921D0 (en) * | 2000-03-31 | 2000-05-17 | Nordson Corp | Power factor corrector |
| KR100576692B1 (en) * | 2000-07-06 | 2006-05-03 | 엘지전자 주식회사 | A circuit for driving back light lamp of LCD |
-
2003
- 2003-08-08 CN CNB031531830A patent/CN100444508C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102123549A (en) * | 2010-12-31 | 2011-07-13 | 东莞市创业电气设备有限公司 | Streetlamp driving circuit and streetlamp |
| CN104822212A (en) * | 2014-12-12 | 2015-08-05 | 武汉绿鼎天舒科技发展有限公司 | High-reliability dual-purpose desk lamp |
| CN104822213A (en) * | 2014-12-12 | 2015-08-05 | 武汉绿鼎天舒科技发展有限公司 | Illuminating device with adjustable brightness |
| CN104837279A (en) * | 2014-12-12 | 2015-08-12 | 武汉绿鼎天舒科技发展有限公司 | High-reliability storage desk lamp |
| CN104968066A (en) * | 2014-12-12 | 2015-10-07 | 武汉绿鼎天舒科技发展有限公司 | Telescopic lighting device |
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| CN100444508C (en) | 2008-12-17 |
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Granted publication date: 20081217 Termination date: 20130808 |