CN100394689C - Two-phase H-shaped bridge driver circuit and method - Google Patents
Two-phase H-shaped bridge driver circuit and method Download PDFInfo
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- CN100394689C CN100394689C CNB021552916A CN02155291A CN100394689C CN 100394689 C CN100394689 C CN 100394689C CN B021552916 A CNB021552916 A CN B021552916A CN 02155291 A CN02155291 A CN 02155291A CN 100394689 C CN100394689 C CN 100394689C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
Abstract
The present invention discloses a two-phase H-shaped bridge drive circuit and a method. The drive circuit comprises two H-shaped bridge circuits, wherein each H-shaped bridge circuit comprises a transformer and two groups of switch assemblies which are respectively connected with both ends of a first side of the transformer, and the two H-shaped bridge circuits share one group of switch assembly. Each switch assembly is provided with a high-order switch element and a low-order switch element, and each switch element is controlled by a signal. The signals which control each switch element are changed to regulate current which passes through a load, so that the purpose of respectively regulating and controlling each load is realized, and the cost is reduced.
Description
Technical field
The present invention relates to a kind of H type bridge-type (H-bridge) drive circuit, more particularly, relate to a kind of two-phase cold-cathode fluorescence lamp (cold cathode fluorescent lamp; CCFL) drive circuit and method.
Background technology
Cold-cathode fluorescence lamp is used to be used as the light source of backlight type display widely, backlight liquid crystal displays particularly, and this cold-cathode fluorescence lamp need be driven by a circuit, and the size of former because display is less, and is need only a cold-cathode fluorescence lamp just enough.Yet along with further developing of science and technology, the size of display is increasing, so need at least two cold-cathode fluorescence lamps to be used as light source, therefore, also just needs a kind of drive circuit that can drive two cold-cathode fluorescence lamps.
For this reason, in the U.S. the 5th, 892, disclosed a kind of drive circuit that drives two cold-cathode fluorescence lamps in No. 336 patents, this drive circuit includes a transformer, and exchanges (AC) power supply, this AC power is connected first side of transformer, and is coupled with the cold-cathode fluorescence lamp of two series connection in second side of transformer.Because this circuit is serially connected two cold-cathode fluorescence lamps, the electric current of two cold-cathode fluorescence lamps equates so flow through, yet each fluorescent tube all has slightly little difference after making, thereby make that the characteristics of luminescence of fluorescent tube is different, therefore, if need lighting tube brightness is adjusted to when identical, this tandem drive circuit just can't use.
In addition in the U.S. the 6th, 396, also disclosed a kind of drive circuit in No. 722 patents, this drive circuit is to utilize four MOS transistor and a transformer to form a full-bridge type (full bridge) circuit, and utilize full bridge circuit to drive cold-cathode fluorescence lamp, yet this circuit can only drive a cold-cathode fluorescence lamp, if will drive two cold-cathode fluorescence lamps, then must use two groups of independently full bridge circuits.Though, use two groups independently full bridge circuit just can adjust by lamp tube current respectively, and make the brightness of fluorescent tube consistent or make by lamp tube current identical,, will raise the cost like this.
Therefore, how providing a kind of flowing through lamps tube current of adjusting is that grinding of creator created the motivation place among the present invention with the drive circuit of controlling lighting tube brightness and reduce cost.
Summary of the invention
Two-phase H-shaped bridge drive circuit among the present invention mainly is can not control electric current that two cold-cathode fluorescence lamps flow through and the problem that adopts two drive circuits can cause cost to increase respectively in order to solve existing fluorescent lamp drive.
The two-phase H-shaped bridge drive circuit comprises among the present invention:
One first group of switch module, this first group of switch module is connected between an input voltage and the reference potential, it includes first a high-side switch assembly that is connected between this input voltage and the first node, and first a low-side switch assembly that is connected between this first node and the reference potential;
One second group of switch module, this second group of switch module is connected between described input voltage and the reference potential, it includes second a high-side switch assembly that is connected between this input voltage and the Section Point, and second a low-side switch assembly that is connected between this Section Point and the reference potential;
One the 3rd group of switch module, the 3rd group of switch module is connected between described input voltage and the reference potential, it includes the 3rd a high-side switch assembly that is connected between described input voltage and one the 3rd node, and the 3rd a low-side switch assembly that is connected between the 3rd node and the reference potential;
One first transformer, this first transformer is connected between first and second node, forming one the one H type bridge circuit, and supplies one first electric current to one first load circuit; And
One second transformer, this second transformer are connected between the first and the 3rd node, forming one the 2nd H type bridge circuit, and supply one second electric current to one second load circuit;
Wherein, the described first high and low bit switch assembly, the second high and low bit switch assembly, the 3rd high and low bit switch assembly are controlled by first to the 6th signal respectively and do to open and closure.
In addition, described two-phase H-shaped bridge drive circuit more includes and is used for first current sensing circuit of senses flow through the electric current of first load circuit, and being used for second current sensing circuit of senses flow through the electric current of second load circuit, this first, second current sensing circuit is first, second current sensor that is used to detect first and second electric current.
The driving method of two-phase H-shaped bridge circuit comprises the following steps: among the present invention
Use one the one H type bridge circuit to supply one first electric current to one first load circuit, the one H type bridge circuit contains one first group of switch module, one second group of switch module and one first transformer, this first group of switch module has that one first high-side switch assembly is connected between an input voltage and the first node and one second low-side switch assembly is connected between this first node and the reference potential, this second group of switch module has that one second high-side switch assembly is connected between this input voltage and the Section Point and one second low-side switch assembly is connected between this Section Point and this reference potential, this first transformer is connected between this first and second node, and in order to supply this first electric current; And
Use one the 2nd H type bridge circuit to supply one second electric current to one second load circuit, the 2nd H type bridge circuit contains one the 3rd group of switch module, described first group of switch module and one second transformer, the 3rd switch module has that one the 3rd high-side switch assembly is connected between this input voltage and one the 3rd node and one the 3rd low-side switch assembly is connected between the 3rd node and this reference potential, this second transformer is connected between this first and the 3rd node, and in order to supply this second electric current;
Wherein, the shared described first group of switch module of a H type bridge circuit and a H type bridge circuit.
From the above, drive circuit among the present invention includes two H type bridge circuits, each H type bridge circuit comprises a transformer and two groups of switch modules that are connected the transformer first side two ends respectively, and second side of transformer is connected with a cold-cathode fluorescence lamp, the shared one group of switch module of these two H type bridge circuits.And each switch module has a high-side switch element and a low-side switch element, each switch element is controlled by a signal respectively, adjust electric current by the signal that changes each switch element of control, make the brightness unanimity or the balanced load electric current of fluorescent tube by cold-cathode fluorescence lamp.
Moreover the drive circuit among the present invention only need use six switch elements, thereby can significantly reduce cost.
Description of drawings
Below in conjunction with accompanying drawing the specific embodiment among the present invention is described in further detail.
Fig. 1 is the enforcement illustration of two-phase H-shaped bridge drive circuit among the present invention;
Fig. 2 is the sequential chart of circuit shown in Fig. 1 under the uneven situation of load current;
Fig. 3 is the sequential chart of circuit shown in Fig. 1 under the current balance situation; And
Fig. 4 is two-phase H-shaped bridge drive circuit another enforcement illustration under the current balance situation among the present invention.
Embodiment
As shown in Figure 1, the two-phase H-shaped bridge drive circuit 100 among the present invention includes one first switch module 110, a second switch assembly 120, one the 3rd switch module 130, one first transformer TX1, one second transformer TX2 and two current sensors 160 and 170.Wherein, first switch module 110 includes one and is connected high-order nmos pass transistor 112 and between an input voltage vin and the node 114 and is connected low level nmos pass transistor 116 between node 114 and the reference potential GND; Second switch assembly 120 includes one and is connected high-order nmos pass transistor 122 and between an input voltage vin and the node 124 and is connected low level nmos pass transistor 126 between node 124 and the reference potential GND; The 3rd switch module 130 includes one and is connected high-order nmos pass transistor 132 and between an input voltage vin and the node 134 and is connected low level nmos pass transistor 136 between node 134 and the reference potential GND; First side of the first transformer TX1 is connected between switch module 110 and 120 forming a H type bridge circuit, and its second side is connected with a cold-cathode fluorescence lamp 140; First side of the second transformer TX2 is connected between switch module 110 and 130 forming another H type bridge circuit, and its second side is connected with another cold-cathode fluorescence lamp 150; Two current sensors 160 and 170 are respectively applied for electric current I 1 and the I2 of sensing by cold-cathode fluorescence lamp 140 and 150.In this drive circuit, nmos pass transistor 112,116,122,126,132 and 136 is all made switch element usefulness, and is controlled by signal S1, S2, S3, S4, S5 and S6 respectively.When transistor 116,122 and 132 conductings simultaneously, electric current I A1 that produces and IB1 are respectively by transformer TX1, TX2, and when transistor 112,126 and 136 conductings simultaneously, electric current I A2 that produces and IB2 pass through transformer TX1, TX2 respectively, thereby produce alternating current I1 and I2 at cold- cathode fluorescence lamp 140 and 150 places respectively after transformer TX1 and TX2 conversion.This embodiment among the present invention adjusts electric current I 1 and I2 by cold- cathode fluorescence lamp 140 and 150 by means of control signal S3, S4, S5 and S6, thereby adjusts the brightness of cold- cathode fluorescence lamp 140 and 150.
As shown in Figure 2, the figure shows signal S1 in the circuit shown in Figure 1, S2, S3, S4, the sequential chart of S5 and S6, wherein, hatched example areas A1 represents the overlapping area of signal S2 and S3, hatched example areas A2 represents the overlapping area of signal S1 and S4, hatched example areas A3 represents the overlapping area of signal S2 and S5, hatched example areas A4 represents the overlapping area of signal S1 and S6, the cartographic represenation of area of hatched example areas A1 and A2 is by the current value of transformer TX1 first side, and the cartographic represenation of area of hatched example areas A3 and A4 passes through the current value of transformer TX2 first side, as shown in Figure 2, and regional A1, A2 and A3, the area difference of A4, therefore, also inequality by the current value of transformer TX1 and TX2.Because the brightness of CCFL is directly proportional with the electric current that passes through, therefore if will adjust the brightness of one of them CCFL, need only change signal S3, S4 or S5, S6 makes its overlapping area change just changeable brightness, and then make the brightness of two CCFL identical, similarly, if will make by the electric current of two CCFL identical, need only be with the overlapping area A1 of signal S3, S5 and S4, S6, A3 and A2, A4 are adjusted to identical getting final product, as shown in Figure 3.
As shown in Figure 4, the drive circuit 200 of the present invention another embodiment under the current balance situation includes nmos pass transistor 112,116,122,126,132 and 136 equally, transformer TX1 and TX2, cold- cathode fluorescence lamp 140 and 150, and two current sensors 160 and 170, connected mode between each element is identical with previous embodiment, no longer describes in detail at this.But transistor 122 and 132 herein is controlled by same signal S3, and transistor 126 and 136 is controlled by same signal S4.Because transistor 122,132 and 126,136 controlled by signal S3 and S4 respectively, therefore, electric current I 1 and I2 by cold- cathode fluorescence lamp 140 and 150 must equate.Thereby utilize the generation circuit that further to simplify control signal S1～S4 behind this embodiment.
In addition; above-mentionedly only two preferred embodiments among the present invention are described; but can not be as protection scope of the present invention; because of as those skilled in the art it being made corresponding modification and modification is fine; therefore; the equivalence that designs spirit and make of the present invention of every foundation changes or modifies, and all should think to fall into protection scope of the present invention.
Claims (15)
1. a two-phase H-shaped bridge drive circuit is characterized in that, comprising:
One first group of switch module, this first group of switch module is connected between an input voltage and the reference potential, it includes first a high-side switch assembly that is connected between this input voltage and the first node, and first a low-side switch assembly that is connected between this first node and the reference potential;
One second group of switch module, this second group of switch module is connected between described input voltage and the reference potential, it includes second a high-side switch assembly that is connected between this input voltage and the Section Point, and second a low-side switch assembly that is connected between this Section Point and the reference potential;
One the 3rd group of switch module, the 3rd group of switch module is connected between described input voltage and the reference potential, it includes the 3rd a high-side switch assembly that is connected between described input voltage and one the 3rd node, and the 3rd a low-side switch assembly that is connected between the 3rd node and the reference potential;
One first transformer, this first transformer is connected between first and second node, forming one the one H type bridge circuit, and supplies one first electric current to one first load circuit; And
One second transformer, this second transformer are connected between the first and the 3rd node, forming one the 2nd H type bridge circuit, and supply one second electric current to one second load circuit;
Wherein, the described first high and low bit switch assembly, the second high and low bit switch assembly, the 3rd high and low bit switch assembly are controlled by first to the 6th signal respectively and do to open and closure.
2. according to the drive circuit described in the claim 1, it is characterized in that: described first electric current equals second electric current.
3. according to the drive circuit described in the claim 1, it is characterized in that: described first electric current is not equal to second electric current.
4. according to the drive circuit described in the claim 1, it is characterized in that: described input voltage is a direct voltage.
5. according to the drive circuit described in the claim 4, it is characterized in that: described first and second electric current is an alternating current.
6. according to the drive circuit described in the claim 1, it is characterized in that: described drive circuit more includes first and second current sensing circuit, to be respectively applied for first and second electric current of sensing.
7. according to the drive circuit described in the claim 1, it is characterized in that: described first and second load circuit includes a cold-cathode fluorescence lamp respectively at least.
8. according to the drive circuit described in the claim 1, it is characterized in that: described the 3rd signal is identical with the 5th signal, and the 4th signal is identical with the 6th signal.
9. according to the drive circuit described in the claim 1, it is characterized in that: described first transformer converts input voltage to first alternating voltage, supplies with described first load circuit; Described second transformer converts input voltage to second alternating voltage, supplies with described second load circuit.
10. according to the drive circuit described in the claim 1, it is characterized in that: described the 3rd signal is different from the 5th signal, and the 4th signal is different from the 6th signal.
11. the drive circuit according to described in the claim 1 is characterized in that: a described high position and low-side switch element are nmos pass transistors.
12. the driving method of a two-phase H-shaped bridge circuit comprises the following steps:
Use one the one H type bridge circuit to supply one first electric current to one first load circuit, the one H type bridge circuit contains one first group of switch module, one second group of switch module and one first transformer, this first group of switch module has that one first high-side switch assembly is connected between an input voltage and the first node and one second low-side switch assembly is connected between this first node and the reference potential, this second group of switch module has that one second high-side switch assembly is connected between this input voltage and the Section Point and one second low-side switch assembly is connected between this Section Point and this reference potential, this first transformer is connected between this first and second node, and in order to supply this first electric current; And
Use one the 2nd H type bridge circuit to supply one second electric current to one second load circuit, the 2nd H type bridge circuit contains one the 3rd group of switch module, described first group of switch module and one second transformer, the 3rd switch module has that one the 3rd high-side switch assembly is connected between this input voltage and one the 3rd node and one the 3rd low-side switch assembly is connected between the 3rd node and this reference potential, this second transformer is connected between this first and the 3rd node, and in order to supply this second electric current;
Wherein, the shared described first group of switch module of a H type bridge circuit and a H type bridge circuit.
13. the driving method according to described in the claim 12 is characterized in that: described method more includes the opening time of each switch module of control, makes the electric current of winning equal second electric current.
14. the driving method according to described in the claim 12 is characterized in that: described method more includes the opening time of each switch module of control, makes the electric current of winning be not equal to second electric current.
15. the driving method according to described in the claim 12 is characterized in that: described method more includes the following step, promptly respectively input voltage is converted to first and second alternating voltage, and supplies with first and second load circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021552916A CN100394689C (en) | 2002-12-12 | 2002-12-12 | Two-phase H-shaped bridge driver circuit and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021552916A CN100394689C (en) | 2002-12-12 | 2002-12-12 | Two-phase H-shaped bridge driver circuit and method |
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| Publication Number | Publication Date |
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| CN1507309A CN1507309A (en) | 2004-06-23 |
| CN100394689C true CN100394689C (en) | 2008-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB021552916A Expired - Fee Related CN100394689C (en) | 2002-12-12 | 2002-12-12 | Two-phase H-shaped bridge driver circuit and method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1056965A (en) * | 1990-05-31 | 1991-12-11 | 江允良 | Three-phase field-controlled bridge-type dc-to-ac converter |
| JPH05121182A (en) * | 1991-10-25 | 1993-05-18 | Hitachi Ltd | Discharge lamp lighting device |
| US5898585A (en) * | 1997-05-29 | 1999-04-27 | Premier Global Corporation, Ltd. | Apparatus and method for providing supplemental alternating current from a solar cell array |
| CN2476898Y (en) * | 2000-10-18 | 2002-02-13 | 深圳市中兴通讯股份有限公司 | All-bridge phase-shift zero-pressure zero-current device with improved structure |
| US6396722B2 (en) * | 1999-07-22 | 2002-05-28 | Micro International Limited | High-efficiency adaptive DC/AC converter |
-
2002
- 2002-12-12 CN CNB021552916A patent/CN100394689C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1056965A (en) * | 1990-05-31 | 1991-12-11 | 江允良 | Three-phase field-controlled bridge-type dc-to-ac converter |
| JPH05121182A (en) * | 1991-10-25 | 1993-05-18 | Hitachi Ltd | Discharge lamp lighting device |
| US5898585A (en) * | 1997-05-29 | 1999-04-27 | Premier Global Corporation, Ltd. | Apparatus and method for providing supplemental alternating current from a solar cell array |
| US6396722B2 (en) * | 1999-07-22 | 2002-05-28 | Micro International Limited | High-efficiency adaptive DC/AC converter |
| CN2476898Y (en) * | 2000-10-18 | 2002-02-13 | 深圳市中兴通讯股份有限公司 | All-bridge phase-shift zero-pressure zero-current device with improved structure |
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| Publication number | Publication date |
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| CN1507309A (en) | 2004-06-23 |
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Granted publication date: 20080611 Termination date: 20131212 |