CN103780229A - Capacitive load drive circuit and pulse excitation device - Google Patents
Capacitive load drive circuit and pulse excitation device Download PDFInfo
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/52017—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00 particularly adapted to short-range imaging
- G01S7/52019—Details of transmitters
- G01S7/5202—Details of transmitters for pulse systems
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- G—PHYSICS
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/52017—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00 particularly adapted to short-range imaging
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- G—PHYSICS
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
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- G01S7/52017—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00 particularly adapted to short-range imaging
- G01S7/52096—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00 particularly adapted to short-range imaging related to power management, e.g. saving power or prolonging life of electronic components
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Abstract
The invention discloses a capacitive load driving circuit and a pulse excitation device. The driving circuit is used for driving a capacitive load, and comprises: a signal source generating an input signal; a linear power supply device coupled between the signal source and an output node, receiving an input signal to output a first pulse signal to the output node, wherein the output node is coupled to a capacitive load; the feedback unit is coupled with the output node and used for capturing the electric signal corresponding to the output node to generate a feedback signal; the feedforward unit is coupled with the signal source to generate a feedforward signal; the control unit is coupled with the feedback unit and the feedforward unit and used for generating a control signal according to the feedback signal and the feedforward signal; and the variable power supply device is coupled between the control unit and the linear power supply device, and outputs a second pulse signal to a power supply end of the linear power supply device according to the control signal so as to assist the first pulse signal in driving the capacitive load.
Description
Technical field
The invention relates to drive circuit, particularly about the drive circuit for driving capacity load.
Background technology
Piezoelectric transducer (piezoelectronic transducer) utilizes piezoelectric effect to measure physical change, is widely used in ultrasonic wave, the technical fields such as engineering mechanics, biomedicine.Piezoelectric transducer needs high-tension pulse excitation equipment, take the required drive circuit of ultrasonic probe as example, must have the ability in the frequency range of the MHz of operating in.The drive circuit that tradition produces this pulse adopts the simple impulse wave of high pressure or step ripple to drive transmission, and system is produced to unnecessary high-order harmonic wave; And use linear amplifier during as drive circuit, can reduce high-frequency harmonic to improve the linearity of fundamental frequency harmonics signal, but inevitably consume a large amount of static powers.Therefore, promoting in the demands such as ultrasonic imaging contrast and high order harmonic component imaging, needing a kind of drive circuit that the fundamental frequency transmission harmonic wave that piezoelectric transducer is clean can be provided, and within power consumption can being controlled to desirable scope.
Summary of the invention
The object of the present invention is to provide a kind of capacitive load drive circuit and pulse excitation device.
In view of this, of the present invention one implements example has disclosed a kind of drive circuit, in order to drive capacity load, above-mentioned drive circuit comprises: linear power supply device, be coupled between signal source and output node, and receive the input signal sending of this signal source, and export according to this first pulse signal to this output node, wherein this output node couples this capacity load; Feedback unit, couples this output node, and acquisition produces feedback signal corresponding to the electrical signals of this output node; Feed forward element, couples this signal source, produces feed-forward signal; Control unit, couples this feedback unit and this feed forward element, uses this feed-forward signal to carry out phase compensation to produce control signal to this feedback signal; And variable power supply device, be coupled between this control unit and this linear power supply device, export the power end of the second pulse signal to linear power supply device according to this control signal, to drive this linear power supply device to this capacity load output drive signal.
Of the present invention another implemented example and disclosed a kind of pulse excitation device, comprising: wave beam forming unit, has excitation signal source; Capacity load; And the drive circuit of aforementioned enforcement example, couples this wave beam forming unit to receive this input signal of this excitation signal source output, in order to export this driving signal to this capacity load.
Accompanying drawing explanation
The disclosed description of the present invention the following drawings of can arranging in pairs or groups is read so that be easier to understand.The Partial Feature that it is noted that accompanying drawing is not planned according to the actual product ratio of industry.In fact, the Aspect Ratio of these features can increase and decrease arbitrarily, does not affect the essence of invention.Feature identical in the present invention all represents with identical label.
Fig. 1 is in one embodiment of the invention, the structure calcspar of drive circuit 10;
Fig. 2 is in one embodiment of the invention, the structure calcspar of drive circuit 100;
Fig. 3 is in one embodiment of the invention, the structure calcspar of drive circuit 200;
Fig. 4 is in one embodiment of the invention, uses the structure calcspar of the pulse excitation device of drive circuit of the present invention;
Fig. 5 shows the Output simulation result of traditional Second Order Impulsive drive circuit;
Fig. 6 shows the Output simulation result of traditional multistage pulse driving circuit;
Fig. 7 shows the Output simulation result of pulse driving circuit of the present invention.
[primary clustering symbol description]
10～drive circuit;
100～drive circuit;
110～signal source;
120～linear power supply device;
140～feedback unit;
150～control unit;
150a～the first control unit;
150b～the second control unit;
152a～the first comparing unit;
152b～the second comparing unit;
155a～first signal processing unit;
155b～secondary signal processing unit;
160～feed forward element;
170～variable power supply device;
170a～the first variable power supply device;
170b～the second variable power supply device;
180～capacity load;
200～drive circuit;
210～signal source;
220～linear power supply device;
240a～the first feedback unit;
240b～the second feedback unit;
250a～the first control unit;
250b～the second control unit;
252a～the first comparing unit;
252b～the second comparing unit;
255a～first signal processing unit;
255b～secondary signal processing unit;
260～feed forward element;
270a～the first variable power supply device;
270b～the second variable power supply device;
280～capacity load;
400～pulse excitation device;
402～wave beam forming unit;
404～capacity load;
CS～control signal;
CSa～the first control signal;
CSb～the second control signal;
Ia～the first pulse signal;
Id～driving signal;
Iin～feedforward current signal;
Ip, In～pulse signal;
Ip1-Ip4～electric current (voltage) source;
In1-In4～electric current (voltage) source;
Is～the second pulse signal;
I
fB+, I
fB-～feedback current signal;
N
out～output node;
Ra～the first comparative result;
Rb～the second comparative result;
S
fB～feedback signal;
S
fF～feed-forward signal;
Sn1-Sn4～switch;
Sp1-Sp4～switch;
Vin～input signal;
V
fB～feedback voltage signal;
V
fF～feed-forward voltage signal.
Embodiment
The content below disclosing can contrast with accompanying drawing, and wherein corresponding parts are shown greatly identical label and indicated on accompanying drawing.And wherein the schematic diagram of equivalent electric circuit only discloses the annexation between assembly, the not relative position of limiter assembly.In following narration, for making easy to understand, many details that specifically arrange are added.But the people with general technology knowledge should understand only to be needed just can realize the present invention with reference to disclosed part exemplary context.In part example, known structure and assembly present in the mode of calcspar, so that content straightforward.
Fig. 1 is in one embodiment of the invention, in order to drive the structure calcspar of drive circuit 10 of capacity load.This drive circuit 10 comprises a signal source 110, produces an input signal Vin; This input signal Vin can be any type of ac signal or pulse electrical signal.This drive circuit 10 also comprises that a linear power supply device 120 is coupled to this signal source 110 and an output node n
outbetween; This linear power supply device 120 receives this input signal Vin, and forms one first pulse signal Ia according to this input signal Vin, and this first pulse signal Ia is via this output node n
outexport a capacity load 180 to.This linear power supply device 120 can comprise a transduction amplifier (transconductance amplifier), receives this input signal Vin and this first pulse signal Ia of generation current form, and the linearity of inhibit signal.
This drive circuit 10 also comprises a feedback unit 140 and a feed forward element 160.This feedback unit 140 is coupled to output node n
out, acquisition is corresponding to output node n
outelectrical signals and produce a feedback signal S
fB; This feed forward element 160, is coupled to this signal source 110, captures this input signal Vin and converts it to a corresponding feed-forward signal S
fF.This feedback unit 140 can directly capture (as shown in Figure 1) this output node n
outon electrical signals; Or see through the electrical signals of power end (input) that detects this linear power supply device 120, and produce corresponding to this output node n
outthis feedback signal SF of electrical signals.
This drive circuit 10 also comprises a control unit 150, couples with feedback unit 140 and feed forward element 160.Control unit 150 receives this feedback signal S
fBand this feed-forward signal S
fF, and according to this feed-forward signal S
fFto this feedback signal S
fBcarry out phase compensation to produce a control signal CS.In part embodiment, control unit 150 can be a subtracter or comparing unit, receives this feed-forward signal S
fFwith this feedback signal S
fBto obtain difference value between the two, as this control signal CS.
This drive circuit 10 also comprises a variable power supply device 170, is coupled between this control unit 150 and linear power supply device 120.This variable power supply device 170 is exported the power end of one second pulse signal Is to linear power supply device 120 according to this control signal CS, and then auxiliary this linear power supply device 120 this first pulse signal of output Ia.Using this first pulse signal Ia as driving signal Id, via output node n
outoutput is to drive this capacity load 180.In part embodiment, this variable power supply device 170 can be a variable current or voltage source, according to this second pulse signal Is of control signal CS output current or voltage form, operates required power supply in order to supply with this linear power supply device 120.
Fig. 2 is in one embodiment of the invention, in order to drive the structure calcspar of drive circuit 100 of capacity load.This drive circuit 100 comprises a signal source 110, produces an input signal Vin.In the present embodiment, signal source 110 is for example a wave beam forming unit (beam former), has an excitation signal source; The input signal Vin that this signal source 110 (wave beam forming unit) produces can be ac signal or the pulse electrical signal with any amplitude and frequency.This drive circuit 100 also comprises linear power supply device 120, is coupled between signal source 110 and a capacitive load 180.In the present embodiment, this linear power supply device 120 is a transduction amplifier (transconductance amplifier), receive this input signal Vin, and according to the first pulse signal Ia of this input signal Vin formation current forms, and keep the linearity of this first pulse signal Ia corresponding to this input signal Vin.This first pulse signal Ia is coupled to output node n
out.
This drive circuit 100 also comprises a feedback unit 140, and a feed forward element 160.This feedback unit 140 is coupled to output node n
out, acquisition is corresponding to output node n
outa voltage signal, and produce a feedback voltage signal V according to this voltage signal
fB.This feedback unit 140 also can comprise that a linear modulator (linear modulator) is first by feedback signal V
fBafter modulation, export to again first, second comparing unit (152a, 152b).This feed forward element 160, is coupled to signal source 110, and feed forward element 160 acquisition this input signal Vin also convert it to a corresponding feed-forward voltage signal V
fF.In part embodiment, in order to utilize feed-forward voltage signal V
fFto feedback voltage signal V
fBcarry out phase compensation, feedback unit 140 and feed forward element 160 also comprise further by this feedback voltage signal V
fBand this feed-forward voltage signal V
fFamplitude do respectively suitable adjustment, both can be compared under identical benchmark.In part embodiment, this feed forward element 160 also can comprise a modulator (modulator), this feed-forward voltage signal of linear modulation V
fFafter exported again, to compare in next stage.In other embodiment of part, feed forward element 160 can also be only a wire.
This feedback unit 140, can also directly capture the current signal that the power input of this linear power supply device 120 receives, and produce this feedback voltage signal V
fB.
This drive circuit 100 also comprises one first control unit 150a and one second control unit 150b.This first, second control unit 150a, 150b, comprise respectively this first comparing unit 152a and this second comparing unit 152b, all couples with this feedback unit 140 and this feed forward element 160.In the present embodiment, this first comparing unit 152a is for example a subtraction circuit, receives feedback voltage signal V
fBand feed-forward voltage signal V
fF, and according to feedback voltage signal V
fBand feed-forward voltage signal V
fFdifference produce one first comparative result Ra, i.e. Ra=(V
fF-V
fB); This second comparing unit 152b is for example also a subtraction circuit, receives this feedback voltage signal V
fBand this feed-forward voltage signal V
fF, and according to this feedback voltage signal V
fBand this feed-forward voltage signal V
fFdifference produce one second comparative result Rb, i.e. Rb=(V
fF-V
fB).
This first control unit 150a also comprises first signal processing unit 155a, is coupled to this first comparing unit 152a.This first signal processing unit 155a receives the first comparative result Ra from this first comparing unit 152a, and carries out format conversion according to the first comparative result Ra, produces a first corresponding control signal CSa.
Should be noted, this first comparing unit 152a and this second comparing unit 152b can use single comparing unit to carry out implementation (not shown).For example, only use on the implementation in the situation of this first comparing unit 152a, this first comparing unit 152a is the common ground of this first and second control unit 150a, 150b, and the comparative result Ra of this first comparing unit 152a offers respectively the unit 155a of this first and second signal place, 155b, also can obtain the function as shown in Fig. 2 framework.In like manner, only use on the implementation in the situation of this second comparing unit 152a, the comparative result Rb of this second comparing unit 152b offers respectively the unit 155a of this first and second signal place, 155b also can obtain the function as shown in Fig. 2 framework.
This drive circuit 100 also comprises the first variable power supply device 170a, is coupled to this first signal processing unit 155a.This first variable power supply device 170a adjusts the signal of output according to this first control signal CSa.In the embodiment of Fig. 2, this the first variable power supply device 170a for example can be a multistage pulse generator, comprise multiple switch S p1 to Sp4, be respectively coupled to multiple current sources or voltage source Ip1 to Ip4, the electric current that wherein current source or voltage source Ip1 to Ip4 produce is first direction.In this embodiment, Ip1 to Ip4 uses current source, but is not defined in this.This first variable power supply device 170a is according to the first control signal CSa, control the conducting of described multiple switch S p1 to Sp4-close configuration, and the generation one pulse signal Ip corresponding to this first comparative result Ra, pulse signal Ip and then export the first power end of linear power supply device 120 to, as one of power supply of the linear supply unit 120 of this driving.
In an embodiment, first signal processing unit 155a comprises multiple hysteresis (Hysteresis) unit, receive respectively this first comparative result Ra from this first comparing unit 152a, and produce a corresponding control signal according to this first comparative result Ra, control switch Sp1 to Sp4 respectively.For example, with first to fourth hysteresis unit (H
1～H
4, not shown) respectively control switch Sp1 to Sp4 describe, but be not defined in this.This k hysteresis unit (H
k, k=1～4) be set to and ought be greater than a k critical value TH by the first comparative result Ra
kwhen _ a, output one first logic state control signal to switch S pk (k=1～4), make switch conduction; Be less than one second critical value TH and work as k comparative result Ra
kwhen _ b, output one second logic state control signal to switch S pk, switch cuts out, wherein this second critical value TH
k_ b is less than or equal to this first critical value TH
k_ a.This first critical value TH
k_ a and this second critical value TH
kthe value of _ b can be set different numerical value voluntarily according to the application of drive circuit.For example be set as TH at this
1_ a<TH
2_ a<TH
3_ a<TH
4_ a, and TH
1_ b<TH
2_ b<TH
3_ b<TH
4_ b, but be not defined in this.
In another embodiment, this first signal processing unit 155a can produce according to this first comparative result Ra the first control signal CSa of one group of N position, wherein this figure place N is the quantity corresponding to switch, and for example, in the embodiment of Fig. 2, this first control signal CSa is four; And the first variable power supply device 170a is according to the first control signal CSa, controls the conducting of described multiple switch S p1 to Sp4-close configuration, and produce this pulse signal Ip of a correspondence.For example first signal processing unit 155a is set to and ought be greater than one the 3rd critical value TH by the first comparative result Ra
kwhen _ c, export first control signal CSa to the first variable power supply device 170a of four, this first control signal CSa is for example " 0101 "; And the first variable power supply device 170a and then according to the first control signal CSa, closing switch Sp2 and Sp4 actuating switch Sp1 and Sp3, make current source Ip1 and Ip3 be connected to the first variable power supply device 170a, to export the pulse signal Ip of a first direction, wherein Ip=Ip1+Ip3.
This second control unit 150b also comprises that secondary signal processing unit 155b is coupled to this second comparing unit 152b.Wherein, this secondary signal processing unit 155b receives the second comparative result Rb from this second comparing unit 152b, and carry out format conversion according to the second comparative result Rb, produce a corresponding second control signal CSb to control corresponding multistage pulse generator.
In an embodiment, this secondary signal processing unit 155b comprises multiple hysteresis (Hysteresis) unit, receive respectively the second comparative result Rb from the second comparing unit 152b, and produce corresponding control signal according to the second comparative result Rb, control switch Sn1 to Sn4 respectively.With first to fourth hysteresis unit (G
1～G
4, not shown) respectively control switch Sn1 to Sn4 describe, but be not defined in this.This m hysteresis unit (G
m, p=1～4) be set to and ought be greater than a p critical value VH by the second comparative result Ra
mwhen _ a, output one first logic state control signal to switch S pm (m=1～4), make switch conduction; Be less than one second critical value VH and work as m comparative result Ra
mwhen _ b, output one second logic state control signal to switch S pm, switch cuts out, wherein the second critical value VH
m_ b is less than or equal to the first critical value VH
m_ a.The first critical value VH
m_ a and the second critical value VH
mthe value of _ b can be set different numerical value voluntarily according to the application of drive circuit.For example be set as VH at this
1_ a<VH
2_ a<VH
3_ a<VH
4_ a, and VH
1_ b<VH
2_ b<VH
3_ b<VH
4_ b, but be not defined in this.
In part embodiment, this first signal processing unit 155a and this secondary signal processing unit 155b can be pulse width modulation (PWM) controller, pulse duration/during modulation (PDM) controller or pulse-frequency modulation (PFM) controller.
In the time that above-mentioned signal processing unit (155a or 155b) uses aforementioned PWM controller, aforementioned comparative result (Ra or Rb) and triangular signal are compared and to produce a pulse-width modulation signal, then by this pulse-width modulation signal input to a counter using produce switching signal corresponding to pulsewidth as this control signal (CSa or CSb) the conducting assembled state with control switch (Sp1-Sp4 or Sn1-Sn4).
In the time that above-mentioned signal processing unit (155a or 155b) uses aforementioned PDM controller, be aforementioned comparative result (Ra or Rb) and triangular signal are compared and produce a pulse duration/during modulation modulating signal, then by this pulse-width modulation signal input to a counter using produce switching signal corresponding to impulse duration as this control signal (CSa or CSb) the conducting assembled state with control switch (Sp1-Sp4 or Sn1-Sn4).
In the time that above-mentioned signal processing unit (155a or 155b) uses aforementioned PFM controller, be that aforementioned comparative result (Ra or Rb) and a reference signal are compared, and produce PFM signal.Afterwards this PFM signal is carried out to the coding of thermometer-code (Thermal-meter code), Gray code (Gray code), dual code (Binary code) etc., and as this control signal (CSa or CSb) the conducting assembled state with control switch (Sp1-Sp4 or Sn1-Sn4).
This drive circuit 100 also comprises the second variable power supply device 170b, is coupled to secondary signal processing unit 155b.170a is similar for the architectural feature of this secondary signal processing unit 155b, this second variable power supply device 170b and this first signal processing unit 155a, this first variable power supply device, difference part is that the electric current that current source in the first variable power supply device 170a or voltage source Ip1 to Ip4 produce is first direction, and wherein this second variable power supply device 170b for example can be a multistage pulse generator.Therefore the electric current that the pulse signal Ip that, the first variable power supply device 170a exports is first direction; The electric current that current source in the second variable power supply device 170b or voltage source In1 to In4 produce is second direction, therefore, and the electric current that the pulse signal In of the second variable power supply device 170b output is second direction.In this embodiment, In1 to In4 uses current source, but is not defined in this.Pulse signal In and then export the second source end of linear power supply device 120 to, as driving one of power supply of linear supply unit 120.
In this embodiment, take this output signal Vin of this signal source 110 as string ripple is as example, this transduction amplifier (linear power supply device 120) output string ripple electric current I a, and this pulse signal Ip is half period (for example positive half cycle) corresponding to this string ripple electric current and the pulse signal of output; And this pulse signal In is the pulse signal of for example, corresponding to second half cycle (negative half period) of this string ripple electric current output.
Pulse signal Ip and In provide the power supply that drives linear supply unit 120 jointly, make linear power supply device 120 (transduction amplifier) this signal Vin can be amplified to output and produce this first pulse signal Ia.This first pulse signal Ia is via output node n
out, as a driving signal Id, export capacity load 180 to.One embodiment of the invention are characterised in that relatively this feedback voltage signal V
fBand this feed-forward voltage signal V
fFand according to this driving signal of comparative result correction Id.Generally speaking, the power consumption of linear power supply device is greater than multistage pulse generator; Therefore, in the time that the power of linear power supply device output is excessive, can see through first and/or secondary signal processing unit 155a, 155b control respectively this first and/or second variable power supply device 170a, 170b required power supply be dynamically provided, to export this driving signal Id to capacity load 180, compared to the mode of fixed power source to this linear power supply device is provided, more can reduce the overall power consumption of drive circuit.
Fig. 3 is in another embodiment of the present invention, in order to drive the structure calcspar of drive circuit 200 of capacity load.This drive circuit 200 comprises a signal source 210, produces an input signal Vin.In the present embodiment, this signal source 210 is for example a wave beam forming unit, and this input signal Vin producing can be ac signal or the pulse electrical signal with any amplitude and frequency.
This drive circuit 200 also comprises linear power supply device 220, is coupled to signal source 210 and an output node n
outbetween.In the present embodiment, linear power supply device 220 is a transduction amplifier (transconductance amplifier), receive this input signal Vin, form the first pulse signal Ia of current forms according to this input signal Vin, and keep the linearity of this driving signal.This first pulse signal Ia is via this output node n
outoutput, to drive a capacity load 280.
This drive circuit 200 also comprises that first and second feedback unit 240a, 240b form.First and second feedback unit 240a, 240b can be for example first and second current sampling unit, be respectively coupled to first and second power end of this linear power supply device 220, with capture respectively this linear power supply device 220 first and second power end for induced current, and produce feedback current signal I according to this for induced current respectively
fB+with I
fB-.This drive circuit 200 also comprises feed forward element 260, is coupled to this signal source 210.Feed forward element 260 can be a trnasducing element, captures this input signal Vin and converts it to a corresponding input current signal Iin.In the present embodiment, in order to utilize feedforward current signal Iin to feedback current signal I
fB+and I
fB-carry out respectively phase compensation, this first and second feedback unit 240a, 240b and this feed forward element 260 also comprise respectively by this feedback current signal I
fB+with I
fB-and the amplitude of this feedforward current signal Iin does suitable adjustment, described multiple signal can be compared under identical benchmark.In part embodiment, this feed forward element 260 also can comprise a low-frequency filter (low-pass filter), in order to reduce the noise of this feedforward current signal Iin.
This drive circuit 200 also comprises one first control unit 250a and one second control unit 250b, and the first control unit 250a also comprises the first comparing unit 252a, and the second control unit 250b also comprises the second comparing unit 252b.This first comparing unit 252a and this first feedback unit 240a and this feed forward element 260 couple; This second comparing unit 252b and this second feedback unit 240b and this feed forward element 260 couple.In the present embodiment, this first control unit 250a is for example a subtraction circuit, receives feedback current signal I
fB+and feedforward current signal Iin, and according to feedback current signal I
fB+and the difference of feedforward current signal Iin produces one first comparative result Ra, i.e. Ra=I
in-I
fB+; The second comparing unit 250b is also for example a subtraction circuit, receives feedback current signal I
fB-and feedforward current signal Iin, and according to this feedback current signal I
fB-and the difference of feedforward current signal Iin produces one second comparative result Rb, i.e. Rb=I
in-I
fB-.
This first control unit 250a also comprises first signal processing unit 255a, is coupled to the first comparing unit 252a.This first signal processing unit 255a receives this first comparative result Ra from this first comparing unit 252a, and produces a first corresponding control signal CSa according to this first comparative result Ra.
This drive circuit 200 also comprises the first variable power supply device 270a, is coupled to this first signal processing unit 255a.In the embodiment of Fig. 3, the first variable power supply device 270a can be a multistage pulse generator, comprise multiple switch S p1 to Sp4, be respectively coupled between multiple current sources or voltage source Ip1 to Ip4, the electric current that wherein current source or voltage source Ip1 to Ip4 produce is first direction.Wherein the first variable power supply device 270a is according to the first control signal CSa, control the conducting of described multiple switch S p1 to Sp4-close configuration, and the pulse signal Ip with first direction of generation one correspondence, pulse signal Ip and then export the first power end of this linear power supply device 220 to, as driving one of power supply of this linear power supply device 220.
This second control unit 250b also comprises secondary signal processing unit 255b, is coupled to the second comparing unit 252b.This secondary signal processing unit 255b receives this second comparative result Rb from this second comparing unit 252b, and produces a second corresponding control signal CSb according to this second comparative result Rb.
In an embodiment, this first and second signal processing unit 255a, 255b can comprise respectively multiple hysteresis (Hysteresis) unit, receive respectively first and second comparative result Ra, Rb from first and second comparing unit 252a, 252b, and respectively according to this first and second comparative result Ra, Rb, produce respectively corresponding control signal, respectively control switch Sp1～Sp4 and Sn1～Sn4.At this, this first and second signal processing unit 255a, 255b adopt and this first and second signal processing unit 155a in Fig. 2, framework that 155b is identical, therefore no longer repeated.
In addition, in part embodiment, this first and second signal processing unit 255a, 255b can be pulse width modulation (PWM) controller, pulse duration/during modulation (PDM) controller or pulse-frequency modulation (PFM) controller.
This drive circuit 200 also comprises the second variable power supply device 270b, is coupled to secondary signal processing unit 255b.The architectural feature of this first signal processing unit 255a, this first variable power supply device 270a, this secondary signal processing unit 255b and this second variable power supply device 270b is identical in fact with the embodiment of Fig. 2.The electric current that the pulse signal In of this second variable power supply device 270b output is second direction.Pulse signal In and then export the second source end of this linear power supply device 220 to, as driving one of power supply of linear supply unit 220.
This pulse signal Ip and In input to this linear power supply device 220, to drive linear supply unit 220 to produce the first pulse signal Ia.This first pulse signal Ia is as a driving signal Id, via output node n
outexport capacity load 280 to.One embodiment of the invention is characterised in that relatively this feedback current signal I
fB+, I
fB-and this feedforward current signal Iin drive signal Id according to modified result.Generally speaking, the power consumption of linear power supply device is greater than multistage pulse generator; Therefore, in the time that the power of linear power supply device output is excessive, can see through first and/or secondary signal processing unit 255a, 255b control respectively the first and/or second variable power supply device 270a, 270b required power supply be dynamically provided, to export this driving signal Id to capacity load 280, compared to the mode of fixed power source to linear power supply device is provided, more can reduce the overall power consumption of drive circuit.
According to the result of the simulated experiment shown in Fig. 5, traditional Second Order Impulsive drive circuit, at amplitude 90V, under the setting of frequency 10MHz, between the fundamental wave (10MHz) of the driving signal that traditional Second Order Impulsive drive circuit is exported and the triple-frequency harmonics of frequency 30MHz (third harmonic distortion), only differ 11dB; In addition, according to the result of the simulated experiment shown in Fig. 6, traditional multistage pulse driving circuit, at amplitude 90V, under the setting of frequency 10MHz, between the fundamental wave (10MHz) of the driving signal that traditional multistage pulse driving circuit is exported and the triple-frequency harmonics of frequency 30MHz (third harmonic distortion), only differ 22dB.According to the result of the simulated experiment shown in Fig. 7, drive circuit in the embodiment of the present invention is at amplitude 90V, under the setting of frequency 10MHz, between the fundamental wave of drive circuit institute output signal and triple-frequency harmonics, differ and exceed 51dB, at least improve 40dB with respect to Fig. 5, at least improved 30dB with respect to Fig. 6, thus the reduction showing the distortion that causes of harmonic wave.And traditional linear amplifier drive circuit is at amplitude 90V, under the setting of frequency 10MHz, the consumption of AC power is 15W; Drive circuit in the embodiment of the present invention is at amplitude 90V, and under the setting of frequency 10MHz, the consumption of AC power is 6.5W.Therefore, the drive circuit that one embodiment of the invention provides has not only improved the harmonic distortion of traditional step pulse driving circuit, and power consumption is more lower than traditional linear amplifier drive circuit.
Please refer to Fig. 4, the present invention has separately disclosed a kind of pulse excitation device 400, comprising: a wave beam forming unit 402, in order to produce the input signal Vin in above-described embodiment for example; One capacity load 404; And as above this drive circuit 10,100 or 200 described in embodiment, couples this wave beam forming unit 402.This drive circuit 10,100 or 200 receives this input signal Vin, in order to output drive signal to this capacity load 404; Wherein, this capacity load 404 is for example piezoelectric element or ultrasonic probe.In this example, this pulse excitation device 400 is for example ultrasonic transducer, and this capacity load 404 is Supersonic probes, but is not defined in this.This drive circuit 10,100 or 200 has described in detail as front, is no longer repeated at this.
More than describe and disclosed concept of the present invention.Should understand the people who has a general knowledge technology in association area can make various modifications according to foregoing, and not departing from spirit of the present invention and category.Moreover all examples only as the use of example, allow the people who reads can be easier to understand the present invention with narration, do not limit the scope of patent protection.All criterions described here, situation, and embodiment, also only as the use of example, be equal to substitute identical in any structure or in function, comprises existing or not yet invented.
Foregoing is only the use of demonstration, and actual scope of patent protection please refer to appending claims.
Claims (14)
1. a drive circuit, in order to drive capacity load, is characterized in that, this drive circuit comprises:
Linear power supply device, couples with output node, and this linear power supply device receives the input signal that signal source is sent, and produces the first pulse signal to this output node according to this input signal, and wherein this output node couples this capacity load;
Feedback unit, couples this output node, and acquisition produces feedback signal corresponding to the electrical signals of this output node;
Feed forward element, couples this signal source, to produce feed-forward signal;
Control unit, couples this feedback unit and this feed forward element, uses this feed-forward signal to carry out phase compensation to produce control signal to this feedback signal; And
Variable power supply device, is coupled between this control unit and this linear power supply device, exports the power end of the second pulse signal to linear power supply device, to drive this linear power supply device to this capacity load output drive signal according to this control signal.
2. drive circuit according to claim 1, it is characterized in that, this linear power supply device comprises a transduction amplifier, receives this input signal and produces this first pulse signal, to keep the linearity of this driving signal, wherein this first pulse signal is current signal.
3. drive circuit according to claim 1 and 2, is characterized in that, this variable power supply device is variable current or voltage source, changes current value or the magnitude of voltage of this exported the second pulse signal according to this control signal.
4. drive circuit according to claim 3, is characterized in that, this variable power supply also comprises:
Multiple curtages source; And
Multiple switches, couple respectively between described multiple curtages source and this output node;
The wherein conducting of multiple switches described in this control signal control-close configuration and change current value or the magnitude of voltage of this second pulse signal.
5. drive circuit according to claim 1 and 2, is characterized in that, this control unit comprises comparing unit, and this comparing unit receives this feed-forward signal and this feedback signal to obtain comparative result between the two, as this control signal.
6. drive circuit according to claim 5, it is characterized in that, this control unit also comprises signal processing unit, is coupled between this comparing unit and this variable power supply, this control signal is carried out to format conversion, to meet the signal format of controlling this variable power supply.
7. drive circuit according to claim 6, is characterized in that, this signal processing unit is linear modulation device or non-linear changing device; This linear modulation device be pulse width modulation controller, pulse duration/during adjusting controller or pulse-frequency modulation controller; This non-linear changing device comprises one or more lagging device.
8. drive circuit according to claim 1, is characterized in that, this feedback unit is that acquisition obtains this feedback signal corresponding to the voltage on this output node or corresponding to the electric current of this output node of flowing through.
9. drive circuit according to claim 2, is characterized in that, this transduction amplifier has to receive the power input that power supply is supplied with, and this feedback unit acquisition is supplied to the curtage of this power input and obtains this feedback signal.
10. a pulse excitation device, is characterized in that, comprising:
Wave beam forming unit, has excitation signal source;
Capacity load; And
One drive circuit as claimed in claim 1, couples this wave beam forming unit to receive this input signal of this excitation signal source output, in order to export this driving signal to this capacity load.
11. pulse excitation devices according to claim 10, is characterized in that, this linear power supply device in this drive circuit comprises a transduction amplifier, receive this input signal and produce this first pulse signal, to keep the linearity of this driving signal; This first pulse signal is current signal.
12. according to the pulse excitation device described in claim 10 or 11, it is characterized in that, the variable power supply device in this drive circuit is variable current or voltage source, changes current value or the magnitude of voltage of this exported the second pulse signal according to this control signal.
13. pulse excitation devices according to claim 12, is characterized in that, this variable power supply device in this drive circuit also comprises:
Multiple curtages source; And
Multiple switches, couple respectively between described multiple curtages source and this output node;
The wherein conducting of multiple switches described in this control signal control-close configuration and change current value or the magnitude of voltage of this second pulse signal.
14. pulse excitation devices according to claim 10, is characterized in that, this capacity load is piezoelectric element or ultrasonic probe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW101138184 | 2012-10-17 | ||
| TW101138184A TWI477078B (en) | 2012-10-17 | 2012-10-17 | Capacitive load driving circuit and pulse generating device |
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| CN103780229A true CN103780229A (en) | 2014-05-07 |
| CN103780229B CN103780229B (en) | 2016-03-09 |
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| CN201310158446.2A Active CN103780229B (en) | 2012-10-17 | 2013-05-02 | Capacitive load drive circuit and pulse excitation device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107454993A (en) * | 2017-07-19 | 2017-12-08 | 深圳市汇顶科技股份有限公司 | Power generation circuit, condenser type array sensing device and terminal device |
| CN113167877A (en) * | 2018-10-05 | 2021-07-23 | 医视特有限公司 | MEMS switch ultrasonic transducer array with improved reliability |
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| US10082565B2 (en) * | 2016-03-31 | 2018-09-25 | Butterfly Network, Inc. | Multilevel bipolar pulser |
| US9778348B1 (en) | 2016-03-31 | 2017-10-03 | Butterfly Network, Inc. | Symmetric receiver switch for bipolar pulser |
| WO2021055721A1 (en) | 2019-09-19 | 2021-03-25 | Butterfly Network, Inc. | Symmetric receiver switch for ultrasound devices |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN103780229B (en) | 2016-03-09 |
| TWI477078B (en) | 2015-03-11 |
| TW201417505A (en) | 2014-05-01 |
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