CN202931220U - Piezoelectric driving circuit with zero voltage switching - Google Patents
Piezoelectric driving circuit with zero voltage switching Download PDFInfo
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- CN202931220U CN202931220U CN2012205456411U CN201220545641U CN202931220U CN 202931220 U CN202931220 U CN 202931220U CN 2012205456411 U CN2012205456411 U CN 2012205456411U CN 201220545641 U CN201220545641 U CN 201220545641U CN 202931220 U CN202931220 U CN 202931220U
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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
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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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
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Abstract
The utility model provides a piezoelectricity drive circuit with zero voltage switches is applicable to switching formula power converter, and it receives an input DC voltage by half-bridge drive circuit, through the switching of half-bridge driven upper arm switch group and underarm switch group to convert into an alternating voltage and give piezoelectric element, make alternating voltage move in order to drive a load through piezoelectric element. The shunt circuit resonates with the parasitic capacitance when the upper arm switch set and the lower arm switch set are both turned off, so that the upper arm switch set and the lower arm switch set perform zero-voltage switching, and therefore, the zero-voltage switching effect can be achieved in a very wide frequency range and under a wide range of load variation.
Description
Technical field
The utility model is relevant a kind of piezoelectric driving circuit with zero voltage switching, refers to especially a kind of piezoelectric driving circuit that can realize the zero voltage switching half-bridge circuit of wideband and wide loading range.
Background technology
Because piezoelectric transformer has slim and radiationless type electromagnetic interference (EMI; Electromagnetic Interference) therefore advantage, is applied on power driving circuit slowly to popularize.Yet, still there are some difficult problems that can't overcome in piezoelectric transformer, for instance, piezoelectric transformer is applied on bridge switching circuit, usually all need to connect an inductance between bridge switching circuit and piezoelectric electro depressor, just can reach the condition of zero voltage switching, but, inductance itself is than piezoelectric transformer also thick (that is structure is larger), so just sacrificed the original thin encapsulation advantage of piezoelectric transformer, and inductance also can cause extra loss and produce the electromagnetic interference problem on main circuit.
Moreover, if in circuit for driving piezoelectric transformer, use noninductive design, though can reach the zero voltage switching condition in the certain loads scope, but available frequency range is too narrow, make piezoelectric transformer in the frequency conversion FEEDBACK CONTROL and on a large scale under load change, still can keep the zero voltage switching action.In fact, the piezoelectric transformer inductor design of whether arranging in pairs or groups no matter, the frequency range scope of the zero voltage switching that whole drive circuit can reach is all quite narrow.Moreover in practical operation, piezoelectric transformer is difficult to reach zero voltage switching under the condition of underloading (light load) and away from principal resonant frequency the time in fact, therefore, has limited to application and the development of piezoelectric transformer in power supply unit.
In view of this, the utility model for the disappearance of above-mentioned prior art, proposes a kind of piezoelectric driving circuit with zero voltage switching, effectively to overcome the problems such as above-mentioned then.
Summary of the invention
Main purpose of the present utility model is providing a kind of piezoelectric driving circuit with zero voltage switching, it utilizes shunt circuit at the lower resonance of assisting of the Dead Time (dead times) of half-bridge switch, make under load change and frequency of operation change, still can keep the effect of zero voltage switching.
Another purpose of the present utility model is providing a kind of piezoelectric driving circuit with zero voltage switching, it utilizes shunt circuit to replace general inductance in the shared volume of primary current path and the loss that causes, can not only allow the integrated circuit slimming, can improve overall circuit performance again, help the competition of overall technology development, application and product.
In order to achieve the above object, the utility model provides a kind of piezoelectric driving circuit with zero voltage switching, comprises a half-bridge drive circuit, a piezoelectric element and at least one shunt circuit.Half-bridge drive circuit system receives an input direct voltage, and half-bridge drive circuit comprises a upper arm switches set of series connection and arm switch group once, and according to the switching of upper arm switches set and underarm switches set to be converted to an alternating voltage.Piezoelectric element is electrically connected half-bridge drive circuit, and accepts alternating voltage, to drive a load action.Shunt circuit is electrically connected between half-bridge drive circuit and piezoelectric element, and shunt circuit system and half-bridge drive circuit carry out resonance, make upper arm switches set and underarm switches set carry out zero voltage switching.
Wherein, when described upper arm switches set and described underarm switches set are all the Dead Time of closed condition, described shunt circuit conducting, and begin resonant charging or discharge with described upper arm switches set and described underarm switches set, and in the ON time of described shunt circuit, charging charge must equal described input direct voltage or discharge charge must be no-voltage, makes described upper arm switches set and described underarm switches set carry out described zero voltage switching.
Wherein, described upper arm switches set comprises one first parasitic capacitance, described underarm switches set comprises one second parasitic capacitance, when described upper arm switches set and described underarm switches set are closed, described shunt circuit conducting, one input capacitance of described piezoelectric element and described the second parasitic capacitance are discharged via described shunt circuit, and described the first parasitic capacitance is recharged simultaneously.
Wherein, described shunt circuit comprises a shunted resistively inductance, a two-way switch and a shunting power supply of series connection, in described shunted resistively inductance and described the first parasitic capacitance, described the second parasitic capacitance, when described input capacitance begins resonance, the described input ac voltage of described piezoelectric element is decremented to no-voltage, and the cross-pressure on described upper arm switches set is incremented to described direct current quasi-position.
Wherein, described shunted resistively inductance is the stray inductance on wire or be the wire diameter on the printed circuit board (PCB) of described shunt circuit in described shunt circuit.
Wherein, described shunting power supply is to provide a driving voltage and gives described bidirectional switch, and the dc voltage value of described shunting power supply is described input direct voltage half.
Wherein, described shunt circuit is 2 o'clock, and it is one first shunt circuit and one second shunt circuit, and described the first shunt circuit comprises one first shunted resistively inductance and one first single-way switch of series connection; Described the second shunt circuit connects described the first shunt circuit, and described the second shunt circuit comprises one second shunted resistively inductance and one second single-way switch of series connection.
Wherein, during described underarm switches set conducting, described the first shunted resistively inductance, described the second shunted resistively inductance and described the first parasitic capacitance, described the second parasitic capacitance, described input capacitance begin resonance, described input capacitance and described the second parasitic capacitance are via described the second shunted resistively inductance and described the second single-way switch discharge, described the first parasitic capacitance is recharged simultaneously, this moment, the described input ac voltage of described piezoelectric element was decremented to no-voltage, and the cross-pressure on described upper arm switches set is incremented to described direct current quasi-position; And
During described upper arm switches set conducting, described the first shunted resistively inductance, described the second shunted resistively inductance and described the first parasitic capacitance, described the second parasitic capacitance, described input capacitance begin resonance, described input capacitance and described the second parasitic capacitance are via described the first shunted resistively inductance and described the first single-way switch charging, described the first parasitic capacitance is discharged simultaneously, this moment, the described input ac voltage of described piezoelectric element was incremented to described direct current quasi-position, and the cross-pressure on described upper arm switches set is decremented to no-voltage.
Wherein, described piezoelectric element is a piezoelectric transformer or a piezo-electric resonator.
Wherein, described upper arm switches set one first electric capacity in parallel, described piezoelectric element one second electric capacity in parallel, and the shunting capacitance of connecting between described the first electric capacity and described shunt circuit, described the second electric capacity is in order to change shunt current value in described shunt circuit and the resonance frequency of described the first electric capacity and described shunt circuit.
The utility model utilizes shunt circuit to replace general inductance in the shared volume of primary current path and the loss that causes, and can not only allow the integrated circuit slimming, can improve overall circuit performance again, helps the competition of overall technology development, application and product.
Under illustrate in detail by specific embodiment, when the effect that is easier to understand the purpose of this utility model, technology contents, characteristics and reaches.
Description of drawings
Fig. 1 is the first embodiment Organization Chart of the present utility model.
Fig. 2 is the first embodiment oscillogram of the present utility model.
Fig. 3 is the second embodiment Organization Chart of the present utility model.
Fig. 4 is the second embodiment oscillogram of the present utility model.
Fig. 5 is the 3rd embodiment Organization Chart of the present utility model.
Fig. 6 is the 4th embodiment Organization Chart of the present utility model.
Description of reference numerals: 10 piezoelectric driving circuits; 12 half-bridge drive circuits; 14 piezoelectric elements; 16 shunt circuits; 162 shunted resistively inductances; 164 bidirectional switchs; 166 shunting power supplys; 18 upper arm switches set; 182 first parasitic capacitances; 184 first parasitic diodes; 20 underarm switches set; 202 second parasitic capacitances; 204 second parasitic diodes; 22 loads; 24 first shunt circuits; 242 first shunted resistively inductances; 244 first single-way switch; 26 second shunt circuits; 262 second shunted resistively inductances; 264 second single-way switch; 28 first electric capacity; 30 second electric capacity; 32 shunting capacitances; 34 piezo-electric resonators; 36 the 3rd electric capacity.
Embodiment
As shown in Figure 1, be the first embodiment Organization Chart of the present utility model.Piezoelectric driving circuit 10 comprises a half-bridge drive circuit 12, a piezoelectric element 14 and at least one shunt circuit 16.The upper arm switches set 18 that half-bridge drive circuit 12 comprises series connection reaches arm switch group 20, and half-bridge drive circuit 12 is to receive an input direct voltage (V
DC), and according to the switching of upper arm switches set 18 and underarm switches set 20 to be converted to an alternating voltage of square wave.Piezoelectric element 14 is to be electrically connected half-bridge drive circuit 16, and accepts alternating voltage, moves to drive a load 22 after resonance.Wherein, load 22 can be cold cathode fluorescent lamp (CCFL), HCFL (HCFL), high-intensity discharge lamp (HID Lamp), light-emitting diode (LED), rectifier circuit, piezo-activator and switching circuit etc.Shunt circuit 16 is electrically connected between half-bridge drive circuit 12 and piezoelectric element 14, and shunt circuit 16 is to carry out resonance with half-bridge drive circuit 12, makes upper arm switches set 18 and underarm switches set 20 carry out zero voltage switching, introduces after holding.
At this, the thin section circuit of said elements first is described, so that understand the mode of operation on subsequent conditioning circuit.Upper arm switches set 18 comprises one first parasitic capacitance (C
K1) 182 and 1 first parasitic diode 184.Underarm switches set 20 comprises one second parasitic capacitance (C
K2) 202 and 1 second parasitic diode 204.Piezoelectric element 14 is piezoelectric transformer or piezo-electric resonator, illustrates as an example of piezoelectric transformer example at this, and it comprises an input capacitance (C
P) 142.In this first embodiment, the utility model uses a component stream circuit 16 to be the example explanation, and it comprises a shunted resistively inductance (L of series connection
S) 162, one two-way switch (K
S) 164 and one shunting power supply (V
DC/ 2) 166.Wherein, shunting power supply 166 is to provide a driving voltage and gives bidirectional switch 164, and the dc voltage value of shunting power supply 166 is input direct voltage (V
DC) half.
Continue, please coordinate simultaneously Fig. 2, be the first embodiment oscillogram of the present utility model.At this, be in the operating process of explanation piezoelectric driving circuit 10, how to reach the effect of zero voltage switching.At first, operate in [t
0-t
1] during, upper arm switches set (K
1) 18 be conducting state, and underarm switches set (K
2) 20 being cut-off state, this moment, shunt circuit 16 cut out, therefore, input current i
PFlow to piezoelectric element 14, and the cross-pressure V on its input capacitance 142
PCan equal input direct voltage (V
DC), and cross-pressure be on the occasion of.This operating period, the bidirectional switch 164 of shunt circuit 16 still presented closed condition when finishing.
Continue, operate in [t
1-t
2] during, when upper arm switches set 18 presents cut-off state simultaneously with underarm switches set 20, be the Dead Time (dead time) of conventional half bridge topology during this; At this moment, shunt circuit 16 is conducting, input capacitance 142, the second parasitic capacitance 202, the first parasitic capacitance 182 and shunted resistively inductance 162 beginning resonance, input capacitance 142 and the second parasitic capacitance 202 can be via shunt circuit 16 beginning resonant discharge, and the first parasitic capacitance 182 beginnings are by resonant charging simultaneously.It should be noted that the cross-pressure V on input capacitance 142
PBe to be decremented to no-voltage with sinusoidal slope, and the cross-pressure on upper arm switches set 18 can be incremented to input DC power (V
DC) voltage quasi position; Thus, namely can be used as the key condition of the zero voltage switching of underarm switches set 20.Certainly, if at [t
1-t
2] during, when the resonant discharge electric current was large not, input capacitance 142 and the second parasitic capacitance 202 just can not discharge into zero fully, and underarm switches set 20 also can not be carried out the no-voltage conducting in next operating period.Wherein, shunted resistively inductance 162 and whole electric capacity are in [t
1-t
2] be calculated as follows row formula 1 during resonance.
Due to [t
1-t
2] time usually very little, during resonance, can be directly at the whole electric capacity that use on shunt circuit 16 on small inductor value (shunted resistively inductance 162) deallocation combined pressure electric drive circuit 10.In order to allow more slimming of integrated circuit, the small inductance value that more can utilize the wire diameter leakage inductance on the printed circuit board (PCB) (PCB) of the stray inductance on wire in shunt circuit 16 or shunt circuit 16 to produce, the input capacitance of arranging in pairs or groups 142, the first parasitic capacitance 182 and the second parasitic capacitance 202 are carried out resonance.Cross-pressure V on input capacitance 142
PWhen being discharged to zero, this operating period namely finishes.
Continue, operate in [t
2-t
3] during, when upper arm switches set 18, underarm switches set 20 and shunt circuit 16 present cut-off state simultaneously.During this, the second parasitic diode 204 meeting conductings of underarm switches set 20 are to provide current i
mFlow through piezoelectric element 14.During arm switch group 20 beginning conducting instantly, this operating period namely finishes.
Continue, operate in [t
3-t
4] during, upper arm switches set 18 is cut-off state, and underarm switches set 20 is conducting state, and this moment, shunt circuit 16 was still what cut out.Switch to conducting constantly in upper arm switches set 18 by cut-off, the input voltage of piezoelectric element 14 is 0, namely cross-pressure V on input capacitance 142
PBe 0, until after switching, V
PStill keep 0, therefore can reach zero voltage switching.When arm switch group 20 switched to cut-off state instantly, this operating period namely finished.
Continue, operate in [t
4-t
5] during, both are cut-off state upper arm switches set 18 and underarm switches set 20, and shunt circuit 16 beginning conductings this moment are as operating in [t
1-t
2] during, input capacitance 142, the second parasitic capacitance 202, the first parasitic capacitance 182 and shunted resistively inductance 162 beginning resonance, input capacitance 142 and the second parasitic capacitance 202 can be via shunt circuit 16 beginning resonant discharge, and the first parasitic capacitance 182 beginnings are by resonant charging simultaneously.Wherein, shunted resistively inductance 162 and whole electric capacity are in [t
4-t
5] be calculated as follows row formula 2 during resonance.
During resonance, the cross-pressure V on input capacitance 142
PTo be incremented to input DC power (V with sinusoidal slope
DC) voltage quasi position, and the cross-pressure on upper arm switches set 18 system is decremented to no-voltage with sinusoidal slope; Thus, namely can be used as the key condition of the zero voltage switching of upper arm switches set 18.Certainly, if at [t
4-t
5] during, when the resonant discharge electric current was large not, input capacitance 142 just can not discharge into zero fully, and upper arm switches set 18 also can not be carried out the no-voltage conducting in next operating period.Cross-pressure V on input capacitance 142
PCharge to input DC power (V
DC) voltage quasi position the time, this operating period namely finishes.
Continue, operate in [t
5-t
0] during, when upper arm switches set 18, underarm switches set 20 and shunt circuit 16 present cut-off state simultaneously, at this moment, the cross-pressure V on input capacitance 142
PBegin to be charged to input DC power (V
DC) voltage quasi position.The first parasitic diode 184 meeting conductings of upper arm switches set 18 simultaneously are to provide current i
mFlow through piezoelectric element 14.When the 18 beginning conducting of upper arm switches set, this operating period namely finishes.Because upper arm switches set 18 switches to conducting constantly by cut-off, because of the input voltage (V of piezoelectric element 14
P) charge to input DC power (V
DC) voltage quasi position, until after switching, V
PStill keep V
DCTherefore, can reach zero voltage switching.
Can be learnt by above-mentioned operating period, upper arm switches set 18 and underarm switches set 20 are respectively at operating in [t
0-t
1] during and [t
3-t
4] during can conducting, other operating periods, both are cut-off upper arm switches set 18 and underarm switches set 20, this is the Dead Time of half-bridge drive circuit 12.Operate in [t
1-t
2] during and [t
4-t
5] during, input capacitance 142, the second parasitic capacitance 202, the first parasitic capacitance 182 and shunted resistively inductance 162 resonant chargings, or by shunt circuit 16 discharges, reach the effect of zero voltage switching.Another reaches the effect of zero voltage switching, for the first parasitic diode 184 of the second parasitic diode 204 of underarm switches set 20 and upper arm switches set 18 respectively respective operations at [t
2-t
3] during and [t
5-t
0] during, current i is provided
mFlow through piezoelectric element 14, load 22 receives current i on piezoelectric element 14
mThe energy that transmits and moving.It should be noted that in piezoelectric element 14 and shunt circuit 16 both operations be there is no direct relation, piezoelectric element 14 is that the square wave that produced by upper arm switches set 18 and underarm switches set 20 drives, and shunt circuit 16 is only the use of zero voltage switching.
Wherein, the utility model uses shunt circuit 16 to make half-bridge drive circuit 12 reach zero voltage switching, still need satisfy following two conditions, and following formula (3) to (6) shows:
1. enough large Dead Time t
d(dead time), namely t
dEqual [t
1-t
3] or [t
4-t
0] during.
2. enough large charging and discharge charge Q.
Wherein, K
SBe bidirectional switch 164, T
SBe the ON time of bidirectional switch 164, as operation [t
1-t
2] during or [t
4-t
5] during; i
sElectric current for shunt circuit 16.
By formula (3)-(6) as can be known, two conditions of zero voltage switching are the current i of enough large Dead Time and shunt circuit 16
s, and its cofactor (as frequency and load) relevance is little.The current i s of shunt circuit 16 is transfused to direct voltage (V
DC), shunted resistively inductance 162(L
S) and input capacitance 142(C
P), the first parasitic capacitance 182(C
K1), the second parasitic capacitance 202(C
K2) capacitance determine, be all the value of intrinsic element.Therefore, as long as Dead Time is fixed, can fix the zero voltage switching condition, and have nothing to do with frequency of operation and load, therefore can reach the large frequency range effect of zero voltage switching.Time t
dCorresponding frequency is 1/t
dSo the frequency of operation higher limit of shunt circuit 16 is 1/t
d
Again as shown in Figure 3, be the second embodiment Organization Chart of the present utility model.Itself and the first embodiment difference are: the second embodiment is the design that actual bidirectional switch is integrated half-bridge drive circuit, namely shunt circuit is designed to two groups, in detail, in piezoelectric driving circuit 10, to be electrically connected two shunt circuits between half-bridge drive circuit 12 and piezoelectric element 14, it is the one first shunted resistively inductance 242(L that one first shunt circuit 24 and one second shunt circuit 26, the first shunt circuits 24 comprise series connection
1) and one first single-way switch 244(S
1).The second shunt circuit 26 connects the one second shunted resistively inductance 262(L that the first shunt circuit 24, the second shunt circuits 26 comprise series connection
2) and one second single-way switch 264(S
2).Wherein, half-bridge drive circuit 12 is identical with the first embodiment with the element of piezoelectric element 14, therefore do not repeat them here.It should be noted that the first shunt circuit 24 directly connects input direct voltage (V
DC), as driving voltage V
1, the second shunt circuit 26 directly connects ground connection (0V), as driving voltage V
2So, can save external power supply, and then simplify whole circuit and open up the TRI design.
Continue, please coordinate simultaneously Fig. 4, be the second embodiment oscillogram of the present utility model.At this, be in the operating process of explanation piezoelectric driving circuit 10, how to reach the effect of zero voltage switching.At first, operate in [t
0-t
1] during, upper arm switches set (K
1) 18 be conducting state, and underarm switches set (K
2) 20 being cut-off state, the first shunt circuit 24 and the second shunt circuit 26 were all and closed this moment, therefore, input current i
PFlow to piezoelectric element 14, and the cross-pressure V on its input capacitance 142
PCan equal input direct voltage (V
DC), and cross-pressure be on the occasion of.This operating period, the first single-way switch 244 and the second single-way switch 264 still presented closed condition when finishing.
Continue, operate in [t
1-t
2] during, when upper arm switches set 18 presented cut-off state simultaneously with underarm switches set 20, the first shunt circuit 24 still presented cut-off state, but underarm switches set 20 is at t
1=t
2Conducting in the time of during this time.So input capacitance 142, the second parasitic capacitance 202, the first parasitic capacitance 182 and the second shunted resistively inductance 262 beginning resonance, input capacitance 142 and the second parasitic capacitance 202 can be via the second shunt circuit 26 beginning resonant discharge, and the first parasitic capacitance 182 beginnings are by resonant charging simultaneously.It should be noted that the cross-pressure V on input capacitance 142
PBe to be decremented to no-voltage with sinusoidal slope, and the cross-pressure on upper arm switches set 18 can be incremented to input DC power (V
DC) voltage quasi position; Thus, namely can be used as the key condition of the zero voltage switching of underarm switches set 20.Certainly, if at [t
1-t
2] during, when the resonant discharge electric current was large not, input capacitance 142 and the second parasitic capacitance 202 just can not discharge into zero fully, and underarm switches set 20 also can not be carried out the no-voltage conducting in next operating period.Wherein, the second shunted resistively inductance 262 and whole electric capacity are in [t
1-t
2] be calculated as follows row formula 7 during resonance.
Due to [t
4-t
5] time usually very little, during resonance, can be directly at the whole electric capacity that use on the first shunt circuit 24 and the second shunt circuit 26 on small inductor deallocation combined pressure electric drive circuit 10.Cross-pressure V on input capacitance 142
PWhen being discharged to zero, this operating period namely finishes.
Continue, operate in [t
2-t
3] during, when upper arm switches set 18, underarm switches set 20 and the first shunt circuit 24 present cut-off state simultaneously.At t
1=t
2During this time, the second single-way switch 264 of the second shunt circuit 26 still is conducting, but the cross-pressure V on input capacitance 142
PBecome 0.At this moment, the second parasitic diode 204 meeting conductings of underarm switches set 20 are to provide current i
mFlow through piezoelectric element 14.Simultaneously, remaining electric current (i on the second shunted resistively inductance 262
s2) by linear discharge, after the second shunted resistively inductance 262 discharged fully, the second shunt circuit 26 was closed automatically.Then, the second single-way switch 264 can cut out under the zero current switching condition in this operating period or next operating period, because do not had electric current to flow through the second shunt circuit 26.In fact, be to close the second single-way switch 264 with lower switch speed in next operating period.During arm switch group 20 beginning conducting instantly, this operating period namely finishes.
Continue, operate in [t
3-t
4] during, upper arm switches set 18 all presents conducting state with underarm switches set 20, this moment the first shunt circuit 24 both are still what close with the second shunt circuit 26; Therefore the input voltage of piezoelectric element 14 is 0, namely cross-pressure V on input capacitance 142
PBe 0, when arm switch group 20 switched to cut-off state instantly, this operating period namely finished.
Continue, operate in [t
4-t
5] during, both are cut-off state upper arm switches set 18 and underarm switches set 20, and this moment, the second shunt circuit 24 was still cut-off state, but the first single-way switch 244 is at t=t
4Begin during this time conducting.As operating in [t
1-t
2] during, input capacitance 142, the second parasitic capacitance 202, the first parasitic capacitance 182 and the second shunted resistively inductance 264 beginning resonance, input capacitance 142 and the second parasitic capacitance 202 can be via the first shunt circuit 24 beginning resonant chargings, and the first parasitic capacitance 182 beginnings are by resonant discharge simultaneously.Therefore, during resonance, the cross-pressure V on input capacitance 142
PTo be incremented to input DC power (V with sinusoidal slope
DC) voltage quasi position, and the cross-pressure on upper arm switches set 18 is to be decremented to no-voltage with sinusoidal slope; Thus, namely can be used as the key condition of the zero voltage switching of upper arm switches set 18.Certainly, if at [t
4-t
5] during, when the resonant discharge electric current was large not, input capacitance 142 just can not discharge into zero fully, and upper arm switches set 18 also can not be carried out the no-voltage conducting in next operating period.Cross-pressure V on input capacitance 142
PCharge to input DC power (V
DC) voltage quasi position the time, this operating period namely finishes.
Continue, operate in [t
5-t
0] during, when upper arm switches set 18, underarm switches set 20 and the first shunt circuit 24 present cut-off state simultaneously, and the first single-way switch 244 still is conducting; At this moment, the cross-pressure V on input capacitance 142
PBegin to be charged to input DC power (V
DC) voltage quasi position.The first parasitic diode 184 meeting conductings of upper arm switches set 18 simultaneously are to provide current i
mFlow through piezoelectric element 14.Simultaneously, remaining electric current (i on the first shunted resistively inductance 242
s1) be discharged to 0 by linearity, and the second shunt circuit 26 is closed automatically.During arm switch group 20 beginning conducting instantly, this operating period namely finishes.
Operating period by the second above-mentioned embodiment can learn, upper arm switches set 18 and underarm switches set 20 are respectively at operating in [t
0-t
1] during and [t
3-t
4] during can conducting, other operating periods, both are cut-off upper arm switches set 18 and underarm switches set 20, this is the Dead Time of half-bridge drive circuit 12.Operate in [t
1-t
2] during and [t4-t5] during, input capacitance 142, the second parasitic capacitance 202, the first parasitic capacitance 182 and the first shunted resistively inductance 242, the second shunted resistively inductance 262 resonant chargings, or by the first shunted resistively inductance 242, the second shunted resistively inductance 262 discharges, reach the effect of zero voltage switching.Another reaches the effect of zero voltage switching, for the first parasitic diode 184 of the second parasitic diode 204 of underarm switches set 20 and upper arm switches set 18 respectively respective operations at [t
2-t
3] during and [t
5-t
0] during, remaining electric current (i on the first shunt circuit 24 and the second shunt circuit 26
s1With i
s2) can be discharged.
Again as shown in Figure 5, be the 3rd embodiment Organization Chart of the present utility model.Itself and the first embodiment difference are: set up one first electric capacity (C
1) 28,1 second electric capacity (C
2) 30 and one shunting capacitance (C
S) 32.Wherein, upper arm switches set 18 the first electric capacity 28 in parallel, piezoelectric element 14 the second electric capacity 30 in parallel, as shown in the equivalent electric circuit in figure, the shunting capacitance 32 of connecting between the first electric capacity 28 and shunt circuit 16.Wherein, the second electric capacity 30 can change the shunt current value i in shunt circuit 16
s, and the resonance frequency (f of the first electric capacity 28 and shunt circuit 16
S).Can utilize the first electric capacity 28 and the second electric capacity 30 to reduce resonance frequency (f
S), can increase the current i in shunt circuit 16
sShunting capacitance 32 can increase resonance frequency (f
S) and reduce current i in shunt circuit 16
sAdd above-mentioned electric capacity, can make the zero voltage switching condition of piezoelectric driving circuit 10 have more design flexibility.
Again as shown in Figure 6, be the 4th embodiment Organization Chart of the present utility model.Itself and the 3rd embodiment difference are: piezoelectric element is piezo-electric resonator 34, uses one the 3rd electric capacity (C
p2) 36 replacement the second electric capacity (C
2), and the mechanical resonant L of former piezoelectric transformer
m-C
m-R
mMechanical resonant L by piezo-electric resonator 34
m2-C
m2-R
m2Replace, in simple terms, utilize exactly piezo-electric resonator 34 to replace piezoelectric transformer and come transferring energy.So can omit the output capacitance (C of former piezoelectric transformer
out), in detail, the current i in former piezoelectric transformer
m-can flow to output capacitance (C
out) and load 22, and in the example of piezo-electric resonator 34, current i
mCan directly flow to load 22.Due to current i
m(vibration velocity) is the physical restriction of piezo-electric resonator, in identical current i
mUnder condition, piezo-electric resonator 34 can access larger wattage output in load 22, and integrated circuit can be simplified more.
In sum, in present circuit for driving piezoelectric transformer, can't reach on a large scale in the frequency conversion FEEDBACK CONTROL and keep the zero voltage switching action under load change, and available frequency range is too narrow, makes overall technology limit development and application because breaking through denouncing of existence.For this reason, the utility model proposes a kind of shunt circuit that utilizes and replace bulky inductance, and utilize shunt circuit to assist resonance under the Dead Time of half-bridge switch, make under load change and frequency of operation change, still can keep the effect of zero voltage switching.Moreover, utilize shunt circuit to replace general inductance in the shared volume of primary current path and the loss that causes, can not only allow the integrated circuit slimming, can improve overall circuit performance again, help the competition of overall technology development, application and product.
The above person is only preferred embodiment of the present utility model, is not to limit the scope that the utility model is implemented.Therefore be that all equalizations of doing according to the described feature of the utility model application range and spirit change or modify, all should be included in claim of the present utility model.
Claims (10)
1. the piezoelectric driving circuit with zero voltage switching, is characterized in that, comprising:
One half-bridge drive circuit is to receive an input direct voltage, and described half-bridge drive circuit comprises a upper arm switches set of series connection and arm switch group once, and according to the switching of described upper arm switches set and described underarm switches set to be converted to an alternating voltage;
One piezoelectric element is electrically connected described half-bridge drive circuit, and accepts described alternating voltage, to drive a load action; And
At least one shunt circuit is electrically connected between described half-bridge drive circuit and described piezoelectric element, and described shunt circuit is to carry out resonance with described half-bridge drive circuit, makes described upper arm switches set and described underarm switches set carry out zero voltage switching.
2. the piezoelectric driving circuit with zero voltage switching according to claim 1, it is characterized in that, when described upper arm switches set and described underarm switches set are all the Dead Time of closed condition, described shunt circuit conducting, and begin resonant charging or discharge with described upper arm switches set and described underarm switches set, and in the ON time of described shunt circuit, charging charge must equal described input direct voltage or discharge charge must be no-voltage, makes described upper arm switches set and described underarm switches set carry out described zero voltage switching.
3. the piezoelectric driving circuit with zero voltage switching according to claim 1, it is characterized in that, described upper arm switches set comprises one first parasitic capacitance, described underarm switches set comprises one second parasitic capacitance, when described upper arm switches set and described underarm switches set are closed, described shunt circuit conducting, an input capacitance of described piezoelectric element and described the second parasitic capacitance are discharged via described shunt circuit, and described the first parasitic capacitance is recharged simultaneously.
4. the piezoelectric driving circuit with zero voltage switching according to claim 3, it is characterized in that, described shunt circuit comprises a shunted resistively inductance, a two-way switch and a shunting power supply of series connection, in described shunted resistively inductance and described the first parasitic capacitance, described the second parasitic capacitance, when described input capacitance begins resonance, the described input ac voltage of described piezoelectric element is decremented to no-voltage, and the cross-pressure on described upper arm switches set is incremented to described direct current quasi-position.
5. the piezoelectric driving circuit with zero voltage switching according to claim 4, is characterized in that, described shunted resistively inductance is the stray inductance on wire or be the wire diameter on the printed circuit board (PCB) of described shunt circuit in described shunt circuit.
6. the piezoelectric driving circuit with zero voltage switching according to claim 4, is characterized in that, described shunting power supply is to provide a driving voltage and gives described bidirectional switch, and the dc voltage value of described shunting power supply is described input direct voltage half.
7. the piezoelectric driving circuit with zero voltage switching according to claim 3, it is characterized in that, described shunt circuit is 2 o'clock, and it is one first shunt circuit and one second shunt circuit, and described the first shunt circuit comprises one first shunted resistively inductance and one first single-way switch of series connection; Described the second shunt circuit connects described the first shunt circuit, and described the second shunt circuit comprises one second shunted resistively inductance and one second single-way switch of series connection.
8. the piezoelectric driving circuit with zero voltage switching according to claim 7, is characterized in that,
During described underarm switches set conducting, described the first shunted resistively inductance, described the second shunted resistively inductance and described the first parasitic capacitance, described the second parasitic capacitance, described input capacitance begin resonance, described input capacitance and described the second parasitic capacitance are via described the second shunted resistively inductance and described the second single-way switch discharge, described the first parasitic capacitance is recharged simultaneously, this moment, the described input ac voltage of described piezoelectric element was decremented to no-voltage, and the cross-pressure on described upper arm switches set is incremented to described direct current quasi-position; And
During described upper arm switches set conducting, described the first shunted resistively inductance, described the second shunted resistively inductance and described the first parasitic capacitance, described the second parasitic capacitance, described input capacitance begin resonance, described input capacitance and described the second parasitic capacitance are via described the first shunted resistively inductance and described the first single-way switch charging, described the first parasitic capacitance is discharged simultaneously, this moment, the described input ac voltage of described piezoelectric element was incremented to described direct current quasi-position, and the cross-pressure on described upper arm switches set is decremented to no-voltage.
9. the piezoelectric driving circuit with zero voltage switching according to claim 1, is characterized in that, described piezoelectric element is a piezoelectric transformer or a piezo-electric resonator.
10. the piezoelectric driving circuit with zero voltage switching according to claim 1, it is characterized in that, described upper arm switches set one first electric capacity in parallel, described piezoelectric element one second electric capacity in parallel, and the shunting capacitance of connecting between described the first electric capacity and described shunt circuit, described the second electric capacity is in order to change shunt current value in described shunt circuit and the resonance frequency of described the first electric capacity and described shunt circuit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW101200388 | 2012-01-06 | ||
| TW101200388U TWM433305U (en) | 2012-01-06 | 2012-01-06 | Piezoelectric drive circuit with zero voltage switching |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202931220U true CN202931220U (en) | 2013-05-08 |
Family
ID=48221130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012205456411U Expired - Lifetime CN202931220U (en) | 2012-01-06 | 2012-10-23 | Piezoelectric driving circuit with zero voltage switching |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN202931220U (en) |
| TW (1) | TWM433305U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103187897A (en) * | 2011-12-30 | 2013-07-03 | 金威贸易有限公司 | Piezoelectric driving circuit with zero voltage switching |
| CN112953289A (en) * | 2021-04-15 | 2021-06-11 | 哈尔滨工业大学 | Resonant direct-current link soft switching inverter and modulation method thereof |
| TWI777531B (en) * | 2021-04-28 | 2022-09-11 | 力林科技股份有限公司 | Llc converter circuit |
-
2012
- 2012-01-06 TW TW101200388U patent/TWM433305U/en not_active IP Right Cessation
- 2012-10-23 CN CN2012205456411U patent/CN202931220U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103187897A (en) * | 2011-12-30 | 2013-07-03 | 金威贸易有限公司 | Piezoelectric driving circuit with zero voltage switching |
| CN103187897B (en) * | 2011-12-30 | 2015-11-25 | 金威贸易有限公司 | Piezoelectric driving circuit with zero voltage switching |
| CN112953289A (en) * | 2021-04-15 | 2021-06-11 | 哈尔滨工业大学 | Resonant direct-current link soft switching inverter and modulation method thereof |
| CN112953289B (en) * | 2021-04-15 | 2022-11-22 | 哈尔滨工业大学 | Resonant direct-current link soft switching inverter and modulation method thereof |
| TWI777531B (en) * | 2021-04-28 | 2022-09-11 | 力林科技股份有限公司 | Llc converter circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| TWM433305U (en) | 2012-07-11 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130508 |