CN100461480C - Driving circuit of piezoelectric transformer - Google Patents
Driving circuit of piezoelectric transformer Download PDFInfo
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- CN100461480C CN100461480C CNB2006100067242A CN200610006724A CN100461480C CN 100461480 C CN100461480 C CN 100461480C CN B2006100067242 A CNB2006100067242 A CN B2006100067242A CN 200610006724 A CN200610006724 A CN 200610006724A CN 100461480 C CN100461480 C CN 100461480C
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Abstract
The invention includes multi piezoelectric transformers connected together in parallel and a bus module. The first input end of the bus module is connected to an output end of first piezoelectric transformer of multi piezoelectric transformers, and the second input end of the bus module is connected to an output end of second piezoelectric transformer of multi piezoelectric transformers. The bus module can make current-sharing and current-totaling for the output current from first and second piezoelectric transformers.
Description
Technical field
The present invention relates to a kind of drive circuit of piezoelectric transformer, but particularly relate to a kind of current-sharing and add up the drive circuit of the output energy of a plurality of piezoelectric transformers.
Background technology
In recent years, along with progressing greatly of piezoelectric transformer (piezoelectric transformer) inductrial technology technology, the employing piezoelectric transformer is that the converter (inverter) on basis is general day by day.The basic principle of piezoelectric transformer is to utilize the energy exchange effect between the electric field and the field of force to come changing voltage, it is little to have volume, in light weight, high energy conversion efficiency, high-reliability, high insulation, with no electromagnetic interference (electromagnet icinterference, numerous advantages such as EMI), therefore replace traditional Wound-rotor type transformer gradually, be widely used in piezoelectric type dc power converter (DC/DC converter), the piezoelectric type AC power is adjusted device (AC power adapter), piezoelectric type charger (charger) and piezoelectric type (backlight) backlight module etc.
LCD (liquid crystal display with at present tool market potential, LCD) be example, compared to traditional Wound-rotor type transformer, piezoelectric transformer more can meet the requirement of LCD product to the backlight module utilization, therefore is used in the drive circuit of backlight module in a large number.Yet, the output capacity of piezoelectric transformer is all generally below 6.5 watts at present, so adopt the drive circuit of piezoelectric transformer to be applied to undersized LCD mostly, for example (personaldigital assistant is PDA) with the desktop screen etc. for mobile computer, personal digital assistant.Therefore, how to promote the output energy of piezoelectric transformer, make piezoelectric transformer can broader applications to the drive circuit of large scale liquid crystal display, become related industry personnel's research emphasis.
Please refer to Fig. 1, Fig. 1 is the schematic diagram of the circuit for driving piezoelectric transformer 10 disclosed in the U.S. Patent number US6791239.Circuit for driving piezoelectric transformer 10 comprises a pulse-width signal (pulse-width modulated, PWM) control unit 12, a plurality of driver element 14, a plurality of converting unit 15, a plurality of piezoelectric transformer 16, and a plurality of load 18.The circuit for driving piezoelectric transformer 10 of prior art is by the output of a plurality of piezoelectric transformers 16 of parallel connection, to provide bigger output energy for using in load 18.Yet, the parallel-connection structure of circuit for driving piezoelectric transformer 10 is only applicable to the close piezoelectric transformer of bulk properties 16, if the characteristic of piezoelectric transformer 16 does not match slightly, will cause problems such as the unequal or frequency of operation shake of the output energy of piezoelectric transformer 16, cause to stablize output current, may cause the damage fracture of piezoelectric transformer 16 when serious.
Please refer to Fig. 2, Fig. 2 is the schematic diagram of the circuit for driving piezoelectric transformer 20 disclosed in the U.S. Patent number US6724126.The moving circuit 20 of piezoelectric transformer comprises a power-supply unit 21, a PWM control unit 22, a driver element 24, two piezoelectric transformers 26, and load 28.Load 28 comprises two serially connected lamp tubes, and its first end is respectively coupled to the output of corresponding piezoelectric transformer 26, and its second end is coupled to each other.Circuit for driving piezoelectric transformer 20 carries out both-end by two groups of piezoelectric transformers 26 and drives in the two ends of load 28, this type of drive still is subject to the output energy limited of piezoelectric transformer 26, when load 28 comprises large scale fluorescent tube or more group of serially connected lamp tubes, and can't effectively drive load 28.
Please refer to Fig. 3, Fig. 3 is the schematic diagram of the circuit for driving piezoelectric transformer 30 disclosed in the U.S. Patent number US6914365.Circuit for driving piezoelectric transformer 30 comprises a power-supply unit 31, a control unit 32, a driver element 34, a converting unit 35, a plurality of piezoelectric transformer 36, and load 38.In circuit for driving piezoelectric transformer 30, piezoelectric transformer 36 is connected in parallel to each other, and the output energy that totalling can be provided is to load 38.Converting unit 35 comprises phase converter (phase transducer) 351 and 352.Driver element 34 comprises the metal-oxide semiconductor transistor, and (output of floating voltage generation unit 344 is coupled to the input of piezoelectric transformer 36 for metal oxidesemiconductor, MOS) 341 and 342, and one floating voltage generation units 344.Though circuit for driving piezoelectric transformer 30 can provide the output energy of totalling by the framework of parallel piezoelectric transformer 36, but the unequal problem of each piezoelectric transformer output energy still exists in the circuit for driving piezoelectric transformer 30, and stable and reliable operating environment also can't be provided when long-time operation.
Summary of the invention
The invention provides a kind of drive circuit of piezoelectric transformer, comprise a plurality of piezoelectric transformers; And one first confluence module, it comprises a first input end, one second input and an output, the first input end of this first confluence module is coupled to the output of one first piezoelectric transformer in these a plurality of piezoelectric transformers, second input of this first confluence module is coupled to the output of one second piezoelectric transformer in these a plurality of piezoelectric transformers, it is characterized in that: first confluence module is designed to comprise first assembly, second assembly and the 3rd assembly, wherein first end of first assembly and second assembly is coupled to first and second inputs of first confluence module respectively, second end of first assembly and second assembly is coupled to first end of the 3rd assembly, and second end of the 3rd assembly is coupled to the output of first confluence module; Wherein, first confluence module is one of following structure: structure 1: the first assembly, second assembly and the 3rd assembly are all electric capacity; 2: the first assemblies of structure and second assembly are inductance, and the 3rd assembly is direct conducting; 3: the first assemblies of structure and second assembly are electric capacity, and the 3rd assembly is direct conducting; 4: the first assemblies of structure and second assembly are respectively electric capacity and inductance in parallel, and the 3rd assembly is direct conducting; 5: the first assemblies of structure and second assembly are inductance, and the 3rd assembly is an electric capacity; And structure 6: the first assemblies, second assembly and the 3rd assemblies are all inductance, wherein, the value of first assembly, second assembly and the 3rd assembly is designed to adjust the impedance of first and second inputs of first confluence module to its output, so that flow into the electric current of first and second inputs of first confluence module is to wait electric current, and the electric current after its output is with current-sharing adds up.
The present invention also provides a kind of drive circuit of piezoelectric transformer, comprises: a plurality of piezoelectric transformers; And one first confluence module, it comprises a first input end, one second input and an output, the first input end of this first confluence module is coupled to the output of one first piezoelectric transformer in these a plurality of piezoelectric transformers, second input of this first confluence module is coupled to the output of one second piezoelectric transformer in these a plurality of piezoelectric transformers, it is characterized in that: this first confluence module comprises a double winding balancing transformer, this double winding balance transformation comprises: one first coil is coupled between the first input end and output of this first confluence module; And one second coil, be coupled between second input and output of this first confluence module, wherein the magnetization sense value with this first coil and this second coil is designed to identical with coil number.
The present invention also provides a kind of drive circuit of piezoelectric transformer, comprises: a plurality of piezoelectric transformers; And one first confluence module, it comprises a first input end, one second input and an output, the first input end of this first confluence module is coupled to the output of one first piezoelectric transformer in these a plurality of piezoelectric transformers, second input of this first confluence module is coupled to the output of one second piezoelectric transformer in these a plurality of piezoelectric transformers, it is characterized in that: first confluence module is designed to comprise first assembly, second assembly and the 3rd assembly, wherein first end of first assembly and second assembly is coupled to first and second inputs of first confluence module respectively, second end of first assembly and second assembly is coupled to the output of first confluence module, and the 3rd assembly is coupled between first end of first assembly and second assembly; Wherein, first confluence module is one of following structure: structure 1: the first assembly, second assembly and the 3rd assembly are all electric capacity; And structure 2: the first assemblies, second assembly and the 3rd assemblies are all inductance, wherein, the value of first assembly, second assembly and the 3rd assembly is designed to adjust the impedance of first and second inputs of first confluence module to its output, so that flow into the electric current of first and second inputs of first confluence module is to wait electric current, and the electric current after its output is with current-sharing adds up.
Description of drawings
Fig. 1 to Fig. 3 is the schematic diagram of circuit for driving piezoelectric transformer in the prior art.
Fig. 4 to Fig. 9 is the schematic diagram of circuit for driving piezoelectric transformer among the present invention first to the 6th embodiment.
Figure 10 to Figure 12 is the schematic diagram of confluence module among the present invention.
Figure 13 is the schematic diagram of a circuit for driving piezoelectric transformer in the seventh embodiment of the invention.
Figure 14 is the schematic diagram of a circuit for driving piezoelectric transformer in the eighth embodiment of the invention.
The reference numeral explanation
12,22,32 control units, 15,35 converting units
14,24,34 driver elements, 21,31 power-supply units
42 main power circuits, 344 floating voltage generation units
351,352 phase converters, 341,342 transistors
A, B input C output
W
1-W
2PCoil C1, C2 electric capacity
18,28,38,46 loads of Z1-Z3 assembly
16,26,36, PZT
1-PZT
2PPiezoelectric transformer
44,100,110,120,134,144,146, CM
1-CM
2T, CM
1-CM
N, CM
X1-CM
XN, CM
Y1-CM
YConfluence module
10,20,30,40,50,60,70,80,90,130,140 circuit for driving piezoelectric transformer
I
1-I
2P, I
Load, I
Load1, I
Load2, I
21, I
22, I
X21, I
X22, I
Y21, I
Y22, I
1N1, I
1N2, I
Out,, I
X (N-1) 1, I
Y (N-1) (N-1), I
R1-I
R (2T), I
N1-I
NN, I
(N-1) 1-I
(N-1) (N-1), I
XN1-I
XNN, I
YN1-I
YNNElectric current
Embodiment
The present invention proposes a kind of drive circuit of piezoelectric transformer, can will organize the output energy superposition of piezoelectric transformer more, so that the bigger extremely big load of consuming energy of output energy to be provided, not only can promote the integral body output usefulness of drive circuit, also can make the output energy equalization between every group of piezoelectric transformer, drive the load of big power consumption effectively.In other words, even the inside equivalent characteristic difference between every group of piezoelectric transformer, the present invention also can make every group of piezoelectric transformer reach identical energy output, can't cause the output energy of certain group piezoelectric transformer excessive, and then cause the overheated and quick aging of a certain piezoelectric transformer, produce problem such as permanent damage such as fracture grade.Please refer to Fig. 4, Fig. 4 is the schematic diagram of a circuit for driving piezoelectric transformer 40 in the first embodiment of the invention.Circuit for driving piezoelectric transformer 40 comprises a main power circuit 42, piezoelectric transformer PZT
1And PZT
2, and a confluence module 44, be used for driving a load 46.Main power circuit 42 is coupled to piezoelectric transformer PZT
1And PZT
2Input and produce piezoelectric transformer PZT
1And PZT
2Input signal.Piezoelectric transformer PZT
1And PZT
2Produce corresponding output current I according to the input signal that receives respectively at its output
1And I
2The first input end A of confluence module 44 and the second input B are respectively coupled to piezoelectric transformer PZT
1And PZT
2Output with received current I respectively
1And I
2, the output C of confluence module 44 then is coupled to an end of load 46.Load 46 can comprise have parallel-connection structure fluorescent tube 1 to fluorescent tube M, load 46 also can comprise a plurality of fluorescent tubes of single fluorescent tube or other structure.
In circuit for driving piezoelectric transformer 40, confluence module 44 can be with piezoelectric transformer PZT
1With PZT
2Output current I
1And I
2Superposition, the total current I behind output C output superposition again
LoadTo load 46, to promote the fan-out capability of whole drive circuit.In first embodiment of the invention, confluence module 44 is the design of a double winding balancing transformer (balance transformer), so only need to be designed to identical with magnetization sense value and the coil number of W2 the coil W1 of internal transformer, can be by the magnetic interlinkage coupled characteristic of transformer, the energy of inflow transformer two coil W1 and W2 such as is forced at the function of current status, and meaning is I
1=I
2Therefore, confluence module 44 of the present invention can add up the output energy of two piezoelectric transformers, to drive the load 46 of bigger power consumption, also can reach the effect of electric current current-sharing simultaneously, eliminate because of the different problems that produce the different operating Frequency point of piezoelectric transformer bulk properties impedance.
Please refer to Fig. 5, Fig. 5 is the schematic diagram of a circuit for driving piezoelectric transformer 50 in the second embodiment of the invention.Circuit for driving piezoelectric transformer 50 comprises main power circuit 42, a P piezoelectric transformer PZT
1-PZT
P, and T confluence module CM
1-CM
T, be used for driving load 46.Main power circuit 42 is coupled to piezoelectric transformer PZT
1-PZT
PInput and produce piezoelectric transformer PZT
1-PZT
PInput signal.Piezoelectric transformer PZT
1-PZT
PProduce corresponding electric current I according to the input signal that receives respectively at its output
1-I
PIn second embodiment of the invention, the number T of the number P of piezoelectric transformer and confluence module has the relation of P=2T, and meaning is that each confluence module corresponds to per two piezoelectric transformers.As shown in Figure 5, each confluence module receives two electric currents that corresponding piezoelectric transformer electric current transmits, and electric current is added the General Logistics Department produce electric current I respectively at output
R1-I
RT, the drive current I that load 46 is received
LoadBe electric current I
R1-I
RTTotal value, so second embodiment of the invention can be by confluence module CM
1-CM
TPromote the whole fan-out capability of circuit for driving piezoelectric transformer 50.
In second embodiment of the invention, each confluence module CM
1-CM
TAlso comprise design as the balancing transformer in the confluence module 44, be designed to identical with coil number the magnetization sense value of internal transformer coil, so can be by the magnetic interlinkage coupled characteristic of transformer, the energy of inflow transformer coil such as is forced at the function of current status, for example I
1=I
2=...=I
PBecause electric current I
1-I
PCan be by confluence module CM
1-CM
TJust can add up output respectively after the current-sharing, add the electric current I of the General Logistics Department
R1-I
RTBetween error is minimum each other, can't be because of the inside equivalent characteristic difference between every group of piezoelectric transformer, therefore excessive the and damage especially easily of the output energy that causes certain group piezoelectric transformer can't influence whole all properties of flow of circuit for driving piezoelectric transformer 50.
Please refer to Fig. 6, Fig. 6 is the schematic diagram of a circuit for driving piezoelectric transformer 60 in the third embodiment of the invention.Circuit for driving piezoelectric transformer 60 comprises main power circuit 42, a P piezoelectric transformer PZT
1-PZT
P, and the 1st rank to the N rank confluence module CM
1-CM
N, be used for driving load 46.Main power circuit 42 is coupled to piezoelectric transformer PZT
1-PZT
PInput and produce piezoelectric transformer PZT
1-PZT
PInput signal.Piezoelectric transformer PZT
1-PZT
PProduce corresponding electric current I according to the input signal that receives respectively at its output
1-I
PIn third embodiment of the invention, N rank, the 1st rank to the confluence module comprises 1-N confluence module respectively, and the total quantity of confluence module is represented by T.The piezoelectric transformer quantity P of circuit for driving piezoelectric transformer 60, the exponent number N of confluence module, and the total quantity T of confluence module has following relation:
P＝2
N；
T＝2
N-1＝P-1；
Each N rank confluence module receives piezoelectric transformer PZT
1-PZT
PIn the output current of two corresponding piezoelectric transformers, with electric current current-sharing and the totalling that receives, and in its output output current I respectively
N1-I
NNIn like manner, each (N-1) rank confluence module receives the output current of two relative N rank confluence modules, with electric current current-sharing and the totalling that receives, and in its output difference output current I
(N-1) 1-I
(N-1) (N-1)The rest may be inferred, the 1st rank confluence module CM
1Receive two the 2nd rank confluence module CM
2Output current I
21And I
22, with electric current current-sharing and the totalling that receives, and in its output output current I
LoadSo load 46 received electric current I that are
1-I
PVia the N rank confluence module current-sharing of the 1st rank to the and add the total value I of the General Logistics Department
LoadIn third embodiment of the invention, by the mode that repeatedly connects of N rank, the 1st rank to the confluence module piezoelectric transformer PZT that adds up
1-PZT
POutput current, can drive the load 46 of bigger power consumption.Simultaneously, circuit for driving piezoelectric transformer 60 comprises multistage confluence module, makes output current and frequency of operation in each rank confluence module be close to equate (I in the confluence module of N rank for example
N1=I
N1=...=I
NN, I in the 2nd rank confluence module
21=I
22Deng), so can significantly improve the whole current-sharing effect of circuit for driving piezoelectric transformer 60.
In the present invention first to the 3rd embodiment, circuit for driving piezoelectric transformer 40,50 and 60 is the structure of single-ended drive, yet the present invention also can be applicable to the structure that both-end drives.Please refer to Fig. 7, Fig. 7 is the schematic diagram of a circuit for driving piezoelectric transformer 70 in the fourth embodiment of the invention.Circuit for driving piezoelectric transformer 70 comprises main power circuit 42, piezoelectric transformer PZT
1-PZT
4, and confluence module CM
1And CM
2, be used for driving load 46.Main power circuit 42 is coupled to piezoelectric transformer PZT
1-PZT
4Input and produce piezoelectric transformer PZT
1-PZT
4Input signal.Confluence module CM
1Two inputs be respectively coupled to piezoelectric transformer PZT
1And PZT
2Output, its output then is coupled to first end of load 46; Confluence module CM
2Two inputs be respectively coupled to piezoelectric transformer PZT
3And PZT
4Output, its output then is coupled to second end of load 46.Piezoelectric transformer PZT
1-PZT
4Produce corresponding output current I according to the input signal that receives respectively at its output
1-I
4, electric current I wherein
1And electric current I
2Phase place is identical, electric current I
3And electric current I
4Phase place is identical, and electric current I
1, I
2And electric current I
3, I
4Phase place is opposite each other.Confluence module CM
1Receive piezoelectric transformer PZT
1And PZT
2The electric current I that electric current transmits
1And I
2, with the electric current current-sharing and add the General Logistics Department and produce electric current I in its output
Load1Simultaneously, confluence module CM
2Receive piezoelectric transformer PZT
3And PZT
4The electric current I that electric current transmits
3And I
4, with the electric current current-sharing and add the General Logistics Department and produce electric current I in its output
Load2, electric current I wherein
Load1And electric current I
Load2Phase place is opposite each other.Therefore, circuit for driving piezoelectric transformer 70 can carry out the both-end driving to load 46.
Confluence module CM
1And CM
2Also can comprise design as the balancing transformer in the confluence module 44, be designed to identical with coil number the magnetization sense value of internal transformer coil, can be by the magnetic interlinkage coupled characteristic of transformer, the energy of inflow transformer coil such as is forced at the function of current status, make I
1=I
2=I
3=I
4, and the received electric current I in the two ends of load 46
Load1And electric current I
Load2Tool same electrical flow valuve.Therefore, the confluence module CM in the circuit for driving piezoelectric transformer 70
1And CM
2The output energy of four groups of piezoelectric transformers can be added up, drive the load 46 of bigger power consumption with both-end, significantly improve the whole driving force of circuit for driving piezoelectric transformer 70, also can reach simultaneously the effect of electric current current-sharing, eliminate because of the different problems that produce the different operating Frequency point of piezoelectric transformer bulk properties impedance.
Please refer to Fig. 8, Fig. 8 is the schematic diagram of a circuit for driving piezoelectric transformer 80 in the fifth embodiment of the invention.Circuit for driving piezoelectric transformer 80 comprises main power circuit 42, a 2P piezoelectric transformer PZT
1-PZT
2P, and 2T confluence module CM
1-CM
2T, be used for driving load 46.Main power circuit 42 is coupled to piezoelectric transformer PZT
1-PZT
2PInput and produce piezoelectric transformer PZT
1-PZT
2PInput signal.Piezoelectric transformer PZT
1-PZT
2PProduce corresponding electric current I according to the input signal that receives respectively at its output
1-I
2P, electric current I wherein
1-I
PPhase place is identical each other, electric current I
P+1-I
2PPhase place is identical each other, and electric current I
1-I
PAnd electric current I
P+1-I
2PBetween phase place is opposite each other.Confluence module CM
1-CM
TInput be respectively coupled to piezoelectric transformer PZT
1-PZT
POutput, its output then is coupled to first end of load 46; Confluence module CM
T+1-CM
2TInput be respectively coupled to piezoelectric transformer PZT
P-PZT
2POutput, its output then is coupled to second end of load 46.In fifth embodiment of the invention, the relation of P=2T is arranged between the number 2P of piezoelectric transformer and the number 2T of confluence module, meaning is that each confluence module corresponds to per two piezoelectric transformers.
As shown in Figure 8, confluence module CM
1-CM
TIn current-sharing and totalling electric current I
1-I
PAfter the output current I that produces respectively
R1-I
RT, the drive current I that first termination of load 46 is subjected to
Load1Be I
R1-I
RTTotal value; Confluence module CM
T+1-CM
2TIn current-sharing and totalling electric current I
P+1-I
2PAfter the output current I that produces respectively
R (T+1)-I
R (2T), the drive current I that second termination of load 46 is subjected to
Load2Be I
R (T+1)-I
R (2T)Total value.Because electric current I
1-I
PAnd electric current I
P+1-I
2PPhase place is opposite each other, electric current I
R1-I
RTAnd electric current I
R (T+1)-I
R (2T)Phase place is also opposite each other, that is to say drive current I
Load1And I
Load2The tool opposite phase.Therefore, circuit for driving piezoelectric transformer 70 can carry out both-end to load 46 and drive, by confluence module CM
1-CM
2TSuperposition piezoelectric transformer PZT
1-PZT
2POutput current I
1-I
2PBut both-end drives the load 46 of bigger power consumption, significantly improves whole driving force.
In addition, in fifth embodiment of the invention, each confluence module CM
1-CM
2TAlso can comprise design as the balancing transformer in the confluence module 44, be designed to identical with coil number the magnetization sense value of internal transformer coil, can be by the magnetic interlinkage coupled characteristic of transformer, the energy of inflow transformer coil such as is forced at the function of current status, for example I
1=I
2=...=I
2PBecause electric current I
1-I
2PCan be by confluence module CM
1-CM
2TJust can add up output respectively after the current-sharing, add the electric current I of the General Logistics Department
R1-I
R (2T)Between error is minimum each other, so drive current I
Load1And I
Load2Difference is also very little to each other, can't be because of the inside equivalent characteristic difference between every group of piezoelectric transformer, and therefore excessive the and damage especially easily of the output energy that causes certain group piezoelectric transformer can't influence whole all properties of flow of circuit for driving piezoelectric transformer 80.
Please refer to Fig. 9, Fig. 9 is the schematic diagram of a circuit for driving piezoelectric transformer 90 in the sixth embodiment of the invention.Circuit for driving piezoelectric transformer 90 comprises main power circuit 42, a 2P piezoelectric transformer PZT
1-PZT
2P, and N rank, the 1st rank to the confluence module, be used for driving load 46.Main power circuit 42 is coupled to piezoelectric transformer PZT
1-PZT
2PInput and produce piezoelectric transformer PZT
1-PZT
2PInput signal.Piezoelectric transformer PZT
1-PZT
2PProduce corresponding electric current I according to the input signal that receives respectively at its output
1-I
2P, electric current I wherein
1-I
PPhase place is identical each other, electric current I
P+1-I
2PPhase place is identical each other, and electric current I
1-I
PAnd electric current I
P+1-I
2PBetween phase place is opposite each other.In sixth embodiment of the invention, the 1st rank confluence module comprises 1 confluence module CM
X1And 1 confluence module CM
Y1, the 2nd rank confluence module comprises 2 confluence module CM
X2And 2 confluence module CM
Y2, in like manner, N rank confluence module comprises N confluence module CM
XNAnd N confluence module CM
YN, that is the 1st rank, the 2nd rank ..., N rank confluence module comprises 2,4 respectively ..., 2N confluence module, and the total quantity of confluence module is represented by 2T.The piezoelectric transformer quantity 2P of circuit for driving piezoelectric transformer 90, the exponent number N of confluence module, and the total quantity 2T of confluence module has following relation:
2P＝2
N+1；
2T＝2
N+1-2＝2P-2；
Each N rank confluence module receives piezoelectric transformer PZT
1-PZT
2PIn the output current of two corresponding piezoelectric transformers, with electric current current-sharing and the totalling that receives, and in its output output current I
XN1-I
XNNWith I
YN1-I
YNNIn like manner, each (N-1) rank confluence module receives the output current of two corresponding N rank confluence modules, with electric current current-sharing and the totalling that receives, and in its output output current I
X (N-1) 1-I
X (N-1) (N-1)With I
Y (N-1) 1-I
Y (N-1) (N-1)The rest may be inferred, the 1st rank confluence module CM
X1And CM
Y1Receive the output current of the 2nd rank confluence module of two correspondences respectively, with electric current current-sharing and the totalling that receives, and respectively at its output output current I
Load1And I
Load2Therefore, the received electric current I that is of first end of load 46
1-I
PVia the current module CM in the confluence module of N rank, the 1st rank to the
X1-CM
XNCurrent-sharing and add the total value I of the General Logistics Department
Load1, and the received electric current I that is of second end of load 46
P+1-I
2PVia the current module CM in the confluence module of N rank, the 1st rank to the
Y1-CM
YNCurrent-sharing and add the total value I of the General Logistics Department
Load2Because electric current I
1-I
PAnd electric current I
P+1-I
2PPhase place is opposite each other, drive current I
Load1And I
Load2Phase place is also opposite each other, so circuit for driving piezoelectric transformer 80 can carry out the both-end driving to load 46.By confluence module superposition piezoelectric transformer PZT
1-PZT
2POutput current I
1-I
2PBut both-end drives the load 46 of bigger power consumption, significantly improves driving force.Simultaneously, circuit for driving piezoelectric transformer 90 comprises multistage confluence module, makes output current and frequency of operation in each rank confluence module be close to equate (I in the confluence module of N rank for example
XN1=I
XN2=...=I
XNNAnd I
YN1=I
YN2=...=I
YNN, I in the 2nd rank confluence module
X21=I
X22And I
Y21=I
Y22Deng), so can significantly improve the whole current-sharing effect of circuit for driving piezoelectric transformer 90.
Employed confluence module can be the design of a balancing transformer, confluence module 44 as shown in Figure 4 in the present invention first to the 6th embodiment.Yet the present invention also can use the confluence module of other type.Please refer to Figure 10, Figure 10 is the schematic diagram of a confluence module 100 among the present invention.Confluence module 100 is the structure of 2 pairs 1 (two inputs are to outputs), comprises coil W1, W2 and capacitor C 1, C2.By the magnetization sense value and the number of turns that change coil W1 and W2, and the value of capacitor C 1, C2, can be by the magnetic interlinkage coupled characteristic of transformer, the energy that flows into confluence module 100 input A and B such as is forced at the function of current status, and (meaning is I
IN1=I
IN2), and the electric current after output C is with current-sharing adds up.Therefore, the output current I of confluence module 100
OutCan drive the load of bigger power consumption, also can reach the effect of electric current current-sharing simultaneously, eliminate because of the different problems that produce the different operating Frequency point of piezoelectric transformer bulk properties impedance.
Please refer to Figure 11, Figure 11 is the schematic diagram of a confluence module 110 among the present invention.Confluence module 110 also is 2 pairs 1 a structure, comprises assembly Z1, Z2 and Z3.First end of assembly Z1 and Z2 is coupled to the input A and the B of confluence module 110 respectively, and second end of assembly Z1 and Z2 then is coupled to first end of assembly Z3, and second end of assembly Z3 is coupled to the output C of confluence module 110.Assembly Z1, Z2 and Z3 can use electric capacity, inductance, or directly conducting (short circuit).According to different assembly Z1, Z2 and Z3, confluence module 110 can comprise array structure down:
Structure 1: assembly Z1, Z2 and Z3 are all electric capacity;
Structure 2: assembly Z1 and Z2 are inductance, and assembly Z3 is direct conducting;
Structure 3: assembly Z1 and Z2 are electric capacity, and assembly Z3 is direct conducting;
Structure 4: assembly Z1 and Z2 are inductance, and assembly Z3 is an electric capacity; And
Structure 5: assembly Z1, Z2 and Z3 are all inductance.
Structure 1-5 no matter, confluence module 110 can change the value of assembly Z1, Z2 and Z3, adjust input A and the B impedance to output C by the value that changes electric capacity or inductance, (meaning is I the function of current status such as so the energy that flows into confluence module 110 input A and B can be forced to
IN1=I
IN2), and the electric current after output C is with current-sharing adds up.Therefore, the output current I of confluence module 110
OutCan drive the load of bigger power consumption, also can reach the effect of electric current current-sharing simultaneously, eliminate because of the different problems that produce the different operating Frequency point of piezoelectric transformer bulk properties impedance.
Please refer to Figure 12, Figure 12 is the schematic diagram of a confluence module 120 among the present invention.Confluence module 120 also is 2 pairs 1 a structure, comprises assembly Z1, Z2 and Z3.First end of assembly Z1 and Z2 is coupled to the input A and the B of confluence module 120 respectively, and second end of assembly Z1 and Z2 is coupled to the output C of confluence module 120, and assembly Z3 then is coupled between first end of assembly Z1 and Z2.Assembly Z1, Z2 and Z3 can use electric capacity, inductance, or directly conducting.According to different assembly Z1, Z2 and Z3, confluence module 120 can comprise array structure down:
Structure 6: assembly Z1, Z2 and Z3 are all electric capacity;
Structure 7: assembly Z1, Z2 and Z3 are all inductance.
Structure 6 or 7 no matter, confluence module 120 can change the value of assembly Z1, Z2 and Z3, adjust input A and the B impedance to output C by the value that changes electric capacity or inductance, (meaning is I the function of current status such as so the energy that flows into confluence module 120 input A and B can be forced to
IN1=I
IN2), and the electric current after output C is with current-sharing adds up.Therefore, the output current I of confluence module 120
OutCan drive the load of bigger power consumption, also can reach the effect of electric current current-sharing simultaneously, eliminate because of the different problems that produce the different operating Frequency point of piezoelectric transformer bulk properties impedance.
Employed confluence module can be the confluence module 44,100,110 or 120 of aforementioned 2 pairs 1 structures in the present invention first to the 6th embodiment.Yet the present invention also can use many confluence modules to 1 structure.Please refer to Figure 13, Figure 13 is the schematic diagram of a circuit for driving piezoelectric transformer 130 in the seventh embodiment of the invention.Circuit for driving piezoelectric transformer 130 comprises main power circuit 42, a P piezoelectric transformer PZT
1-PZT
P, and a confluence module 134, be used for driving load 46.Main power circuit 42 is coupled to piezoelectric transformer PZT
1-PZT
PInput and produce piezoelectric transformer PZT
1-PZT
PInput signal.Piezoelectric transformer PZT
1-PZT
PProduce corresponding electric current I according to the input signal that receives respectively at its output
1-I
P
The P of confluence module 134 input is respectively coupled to piezoelectric transformer PZT
1-PZT
P, can be with piezoelectric transformer PZT
1-PZT
POutput current I
1-I
PSuperposition is again in the total current I of output output superposition
LoadTo load 46, to promote the fan-out capability of whole piezoelectric transformer.In seventh embodiment of the invention, confluence module 134 is the design of the balancing transformer of winding more than, comprises coil W
1-W
P, by changing coil W
1-W
PThe magnetization sense value and the number of turns, the function of current status such as the energy of each coil of inflow transformer can be forced to, meaning is I
1=I
2=...=I
PTherefore, circuit for driving piezoelectric transformer 130 of the present invention only need use the confluence module can be with piezoelectric transformer PZT
1-PZT
PThe output energy add up, to drive the load 46 of bigger power consumption, also can reach the effect of electric current current-sharing simultaneously, eliminate because of the different problems that produce the different operating Frequency point of piezoelectric transformer bulk properties impedance.
Please refer to Figure 14, Figure 14 is the schematic diagram of a circuit for driving piezoelectric transformer 140 in the eighth embodiment of the invention.Circuit for driving piezoelectric transformer 140 comprises main power circuit 42, a 2P piezoelectric transformer PZT
1-PZT
2P, and confluence module 144 and 146, be used for driving load 46.Main power circuit 42 is coupled to piezoelectric transformer PZT
1-PZT
2PInput and produce piezoelectric transformer PZT
1-PZT
2PInput signal.Piezoelectric transformer PZT
1-PZT
2PProduce corresponding electric current I according to the input signal that receives respectively at its output
1-I
2P
The P of confluence module 144 input is respectively coupled to piezoelectric transformer PZT
1-PZT
P, can be with piezoelectric transformer PZT
1-PZT
POutput current I
1-I
PSuperposition is again in the total current I of output output superposition
Load1First end to load 46; The P of confluence module 146 input is respectively coupled to piezoelectric transformer PZT
P+1-PZT
2P, can be with piezoelectric transformer PZT
P+1-PZT
2POutput current I
P+1-I
2PSuperposition is again in the total current I of output output superposition
Load2To second end of load 46, so can promote the fan-out capability of whole piezoelectric transformer.In eighth embodiment of the invention, confluence module 144 and 146 is the design of many windings balancing transformer, comprises coil W respectively
1-W
PWith coil W
P+1-W
2P, by changing coil W
1-W
2PThe magnetization sense value and the number of turns, the function of current status such as the energy of each coil of inflow transformer can be forced to, meaning is I
1=I
2=...=I
2PTherefore, circuit for driving piezoelectric transformer 140 of the present invention only need use two confluence modules can be with piezoelectric transformer PZT
1-PZT
2PThe output energy add up, drive the load 46 of bigger power consumption with both-end, also can reach the effect of electric current current-sharing simultaneously, eliminate because of the different problems that produce the different operating Frequency point of piezoelectric transformer bulk properties impedance.
The above only is preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (33)
1. the drive circuit of a piezoelectric transformer comprises:
A plurality of piezoelectric transformers; And
One first confluence module, it comprises a first input end, one second input and an output, the first input end of this first confluence module is coupled to the output of one first piezoelectric transformer in these a plurality of piezoelectric transformers, second input of this first confluence module is coupled to the output of one second piezoelectric transformer in these a plurality of piezoelectric transformers
It is characterized in that:
First confluence module is designed to comprise first assembly, second assembly and the 3rd assembly, wherein first end of first assembly and second assembly is coupled to first and second inputs of first confluence module respectively, second end of first assembly and second assembly is coupled to first end of the 3rd assembly, and second end of the 3rd assembly is coupled to the output of first confluence module;
Wherein, first confluence module is one of following structure: structure 1: the first assembly, second assembly and the 3rd assembly are all electric capacity; 2: the first assemblies of structure and second assembly are inductance, and the 3rd assembly is direct conducting; 3: the first assemblies of structure and second assembly are electric capacity, and the 3rd assembly is direct conducting; 4: the first assemblies of structure and second assembly are respectively electric capacity and inductance in parallel, and the 3rd assembly is direct conducting; 5: the first assemblies of structure and second assembly are inductance, and the 3rd assembly is an electric capacity; And structure 6: the first assemblies, second assembly and the 3rd assemblies be all inductance,
Wherein, the value of first assembly, second assembly and the 3rd assembly is designed to adjust the impedance of first and second inputs of first confluence module to its output, so that flow into the electric current of first and second inputs of first confluence module is to wait electric current, and the electric current after its output is with current-sharing adds up.
2. drive circuit as claimed in claim 1 also comprises:
One second confluence module, it comprises a first input end, one second input and an output, the first input end of this second confluence module is coupled to the output of one the 3rd piezoelectric transformer in these a plurality of piezoelectric transformers, and second input of this second confluence module is coupled to the output of one the 4th piezoelectric transformer in these a plurality of piezoelectric transformers.
3. drive circuit as claimed in claim 2 also comprises:
One the 3rd confluence module, it comprises a first input end, one second input and an output, and first and second inputs of the 3rd confluence module are respectively coupled to the output of this first and second confluence module.
4. drive circuit as claimed in claim 1 also comprises a main power circuit, is used for producing the input signal of this piezoelectric transformer.
5. drive circuit as claimed in claim 1, wherein the output of this first confluence module is coupled to an end of a load.
6. drive circuit as claimed in claim 5, wherein this load comprises a cathode fluorescent tube, an external-electrode fluorescent lamp pipe, a light-emitting diode or a plane fluorescent tube.
7. drive circuit as claimed in claim 5, wherein this load comprises a plurality of cathode fluorescent tubes, a plurality of external-electrode fluorescent lamp pipe, a plurality of light-emitting diode or a plurality of planes fluorescent tube.
8. drive circuit as claimed in claim 2, wherein the output of this first confluence module is coupled to first end of a load, and the output of this second confluence module is coupled to second end of this load.
9. drive circuit as claimed in claim 8, wherein this load comprises a cathode fluorescent tube, an external-electrode fluorescent lamp pipe, a light-emitting diode or a plane fluorescent tube.
10. drive circuit as claimed in claim 8, wherein this load comprises a plurality of cathode fluorescent tubes, a plurality of external-electrode fluorescent lamp pipe, a plurality of light-emitting diode or a plurality of planes fluorescent tube.
11. drive circuit as claimed in claim 3, wherein the output of the 3rd confluence module is coupled to an end of a load.
12. drive circuit as claimed in claim 11, wherein this load comprises a cathode fluorescent tube, an external-electrode fluorescent lamp pipe, a light-emitting diode or a plane fluorescent tube.
13. drive circuit as claimed in claim 11, wherein this load comprises a plurality of cathode fluorescent tubes, a plurality of external-electrode fluorescent lamp pipe, a plurality of light-emitting diode or a plurality of planes fluorescent tube.
14. drive circuit as claimed in claim 1, wherein this first confluence module also comprises a plurality of the 3rd inputs, is respectively coupled to the output of other piezoelectric transformer outside this first and second piezoelectric transformer in these a plurality of piezoelectric transformers.
15. drive circuit as claimed in claim 14, wherein this first confluence module comprises the balancing transformer of winding more than, and it comprises a plurality of coils, is respectively coupled between each input and output of this first confluence module.
16. the drive circuit of a piezoelectric transformer comprises:
A plurality of piezoelectric transformers; And
One first confluence module, it comprises a first input end, one second input and an output, the first input end of this first confluence module is coupled to the output of one first piezoelectric transformer in these a plurality of piezoelectric transformers, second input of this first confluence module is coupled to the output of one second piezoelectric transformer in these a plurality of piezoelectric transformers
It is characterized in that:
This first confluence module comprises a double winding balancing transformer, and this double winding balance transformation comprises:
One first coil is coupled between the first input end and output of this first confluence module; And
One second coil is coupled between second input and output of this first confluence module,
Wherein the magnetization sense value with this first coil and this second coil is designed to identical with coil number.
17. drive circuit as claimed in claim 16, wherein the number of turns ratio of this first and second coil is proportional to the power output ratio of this first and second piezoelectric transformer.
18. drive circuit as claimed in claim 16 also comprises:
One first electric capacity is coupled between the first input end and output of this first confluence module, and is parallel to this first coil; And
One second electric capacity is coupled between second input and output of this first confluence module, and is parallel to this second coil.
19. the drive circuit of a piezoelectric transformer comprises:
A plurality of piezoelectric transformers; And
One first confluence module, it comprises a first input end, one second input and an output, the first input end of this first confluence module is coupled to the output of one first piezoelectric transformer in these a plurality of piezoelectric transformers, second input of this first confluence module is coupled to the output of one second piezoelectric transformer in these a plurality of piezoelectric transformers
It is characterized in that:
First confluence module is designed to comprise first assembly, second assembly and the 3rd assembly, wherein first end of first assembly and second assembly is coupled to first and second inputs of first confluence module respectively, second end of first assembly and second assembly is coupled to the output of first confluence module, and the 3rd assembly is coupled between first end of first assembly and second assembly;
Wherein, first confluence module is one of following structure: structure 1: the first assembly, second assembly and the 3rd assembly are all electric capacity; And structure 2: the first assemblies, second assembly and the 3rd assemblies be all inductance,
Wherein, the value of first assembly, second assembly and the 3rd assembly is designed to adjust the impedance of first and second inputs of first confluence module to its output, so that flow into the electric current of first and second inputs of first confluence module is to wait electric current, and the electric current after its output is with current-sharing adds up.
20. drive circuit as claimed in claim 19 also comprises:
One second confluence module, it comprises a first input end, one second input and an output, the first input end of this second confluence module is coupled to the output of one the 3rd piezoelectric transformer in these a plurality of piezoelectric transformers, and second input of this second confluence module is coupled to the output of one the 4th piezoelectric transformer in these a plurality of piezoelectric transformers.
21. drive circuit as claimed in claim 20 also comprises:
One the 3rd confluence module, it comprises a first input end, one second input and an output, and first and second inputs of the 3rd confluence module are respectively coupled to the output of this first and second confluence module.
22. drive circuit as claimed in claim 19 also comprises a main power circuit, is used for producing the input signal of this piezoelectric transformer.
23. drive circuit as claimed in claim 19, wherein the output of this first confluence module is coupled to an end of a load.
24. drive circuit as claimed in claim 23, wherein this load comprises a cathode fluorescent tube, an external-electrode fluorescent lamp pipe, a light-emitting diode or a plane fluorescent tube.
25. drive circuit as claimed in claim 23, wherein this load comprises a plurality of cathode fluorescent tubes, a plurality of external-electrode fluorescent lamp pipe, a plurality of light-emitting diode or a plurality of planes fluorescent tube.
26. drive circuit as claimed in claim 20, wherein the output of this first confluence module is coupled to first end of a load, and the output of this second confluence module is coupled to second end of this load.
27. drive circuit as claimed in claim 26, wherein this load comprises a cathode fluorescent tube, an external-electrode fluorescent lamp pipe, a light-emitting diode or a plane fluorescent tube.
28. drive circuit as claimed in claim 26, wherein this load comprises a plurality of cathode fluorescent tubes, a plurality of external-electrode fluorescent lamp pipe, a plurality of light-emitting diode or a plurality of planes fluorescent tube.
29. drive circuit as claimed in claim 21, wherein the output of the 3rd confluence module is coupled to an end of a load.
30. drive circuit as claimed in claim 29, wherein this load comprises a cathode fluorescent tube, an external-electrode fluorescent lamp pipe, a light-emitting diode or a plane fluorescent tube.
31. drive circuit as claimed in claim 29, wherein this load comprises a plurality of cathode fluorescent tubes, a plurality of external-electrode fluorescent lamp pipe, a plurality of light-emitting diode or a plurality of planes fluorescent tube.
32. drive circuit as claimed in claim 31, wherein this first confluence module also comprises a plurality of the 3rd inputs, is respectively coupled to the output of other piezoelectric transformer outside this first and second piezoelectric transformer in these a plurality of piezoelectric transformers.
33. drive circuit as claimed in claim 32, wherein this first confluence module comprises the balancing transformer of winding more than, and it comprises a plurality of coils, is respectively coupled between each input and output of this first confluence module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100067242A CN100461480C (en) | 2006-02-07 | 2006-02-07 | Driving circuit of piezoelectric transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100067242A CN100461480C (en) | 2006-02-07 | 2006-02-07 | Driving circuit of piezoelectric transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1819292A CN1819292A (en) | 2006-08-16 |
| CN100461480C true CN100461480C (en) | 2009-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100067242A Expired - Fee Related CN100461480C (en) | 2006-02-07 | 2006-02-07 | Driving circuit of piezoelectric transformer |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001085759A (en) * | 1999-09-13 | 2001-03-30 | Hitachi Metals Ltd | Driving method of piezoelectric transformer and its driving circuit |
| CN1421940A (en) * | 2001-11-29 | 2003-06-04 | 松下电器产业株式会社 | Drive circuit, cold-cathod tube illuminating device and liquid crystal panel for piezoelectric transformer |
| US6724126B2 (en) * | 2002-05-30 | 2004-04-20 | Shin Jiuh Corp. | Multi-load piezoelectric transformation circuit driver module |
| US6791239B2 (en) * | 2002-11-19 | 2004-09-14 | Shin Jiuh Corp. | Piezoelectric transformation driving apparatus |
| US6914365B1 (en) * | 2004-04-28 | 2005-07-05 | Zippy Technology Corp. | Piezoelectric transformation driving apparatus |
-
2006
- 2006-02-07 CN CNB2006100067242A patent/CN100461480C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001085759A (en) * | 1999-09-13 | 2001-03-30 | Hitachi Metals Ltd | Driving method of piezoelectric transformer and its driving circuit |
| CN1421940A (en) * | 2001-11-29 | 2003-06-04 | 松下电器产业株式会社 | Drive circuit, cold-cathod tube illuminating device and liquid crystal panel for piezoelectric transformer |
| US6724126B2 (en) * | 2002-05-30 | 2004-04-20 | Shin Jiuh Corp. | Multi-load piezoelectric transformation circuit driver module |
| US6791239B2 (en) * | 2002-11-19 | 2004-09-14 | Shin Jiuh Corp. | Piezoelectric transformation driving apparatus |
| US6914365B1 (en) * | 2004-04-28 | 2005-07-05 | Zippy Technology Corp. | Piezoelectric transformation driving apparatus |
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| 《高频电路》上册. 清华大学通讯教研组，428-441，人民邮电出版社. 1979 |
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| CN1819292A (en) | 2006-08-16 |
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