CN1586672A - Power supersonic transducer exciting circuit - Google Patents
Power supersonic transducer exciting circuit Download PDFInfo
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- CN1586672A CN1586672A CN 200410053260 CN200410053260A CN1586672A CN 1586672 A CN1586672 A CN 1586672A CN 200410053260 CN200410053260 CN 200410053260 CN 200410053260 A CN200410053260 A CN 200410053260A CN 1586672 A CN1586672 A CN 1586672A
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Abstract
The power supersonic transducer exciting circuit used in biomedicine engineering technology includes two signal generator circuits; gate circuit with first and second inputs connected to the outputs of the signal generator circuits, control end accepting the frequency selecting signal, the third input accepting signal from the protecting circuit and output connected to the input of the driver circuit; driver circuit with output connected to the signal input of serially resonant power amplifier circuit; serially resonant power amplifier circuit with feeding input connected to the voltage output of multiple-stage DC source to output protecting signal to the protecting circuit and signal output connected to the power supersonic transducer to excite it to send supersonic wave. The present invention has simple circuit, easy regulation, controllable output signal amplitude and duty ratio, high transmission efficiency and circuit safety.
Description
Technical field
What the present invention relates to is a kind of exciting circuit that is used for the medical apparatus and instruments in biomedical engineering technology field, especially a kind of power ultrasonic transducer exciting circuit of malignant tumor ultrasound thermal therapy system.
Background technology
Ultrasound thermal therapy can be treated superficial tumor can treat deep tumor again, and safety is controlled, and curative effect is good, have no side effect, and it has tangible complementation and effect of enhanced sensitivity with radiotherapy, chemotherapy, and thermotherapy combination with radiotherapeutic or chemotherapy realization Comprehensive Treatment, curative effect will significantly improve; In addition, ultrasound thermal therapy does not have ionization, Non-ionizing radiation and electromagnetic radiation, neither can bring any infringement to the medical worker, do not pollute the environment again, thereby ultrasound thermal therapy is a kind of emerging strong anticancer means.In recent years, be that the heavy dose of representative is the Therapeutic Method of damaging dosage with high intensity focused ultrasound (HIFU), obtained breakthrough progress, more make ultrasonic therapeutic apparatus obtain significant progress.Numerous ultrasonic therapeutic apparatus does not all leave the power ultrasonic transducer exciting circuit, it must provide suitable voltage and current according to the treatment needs, be suitable power, particularly importantly it must be controlled, can correspondingly adjust voltage, electric current and the dutycycle of its output along with the progress of treatment.
Find through literature search prior art, the Chinese patent Granted publication number is CN1111074C, patent name is: large power supersonic transducer array drive circuit, though have new meaning, and overcome some weak point of other homogeneous circuit, but its " push-pull type class C circuit that power drive unit is made up of identical two arm circuit " uses transformator output.Cause lower or the like the weak point of its complex circuit, required feed supply voltage height, efficient.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of power ultrasonic transducer exciting circuit is provided, make it be used for the malignant tumor ultrasound thermal therapy system, it is simple to have circuit, debugging is convenient, and the feed supply voltage is low, the equal may command of the amplitude of output signal and dutycycle, work efficiency and efficiency of transmission are all very high, advantages such as circuit security of operation, flexible, the high performance price ratio of control.
The present invention is achieved by the following technical solutions, the present invention is by first signal generating circuit, secondary signal generation circuit, storbing gate, signal modulation circuit, drive circuit, the series resonance power amplification circuit, each element circuit of multistage dc source and holding circuit constitutes, the outfan of first signal generating circuit and secondary signal generation circuit is linked into the input of storbing gate respectively, the control end of storbing gate is accepted frequency and is selected signal, this signal is from the Intellectualized monitoring subsystem of malignant tumor ultrasound thermal therapy system, the Intellectualized monitoring subsystem is another subsystem of malignant tumor ultrasound thermal therapy system, by the monitoring plug-in card, main control computer, intelligent software, parts such as human computer conversation's peripheral hardware are formed, be that malignant tumor ultrasound thermal therapy system each several part is normal, reasonably operation and the intelligent command centre that controls, the operating frequency of described power ultrasonic transducer exciting circuit is selected; The stepping of feed supply voltage is regulated; press meticulous control ultrasonic power output of pwm signal or the like all by its monitoring; its outfan is linked into first input of signal modulation circuit; second input of signal modulation circuit accepted the pulse width modulation (PWM) signal from the Intellectualized monitoring subsystem; its the 3rd input accepts self-protection circuit's signal; its outfan is linked into the input of drive circuit; the outfan of drive circuit is linked into the signal input part of series resonance power amplification circuit; the feed input of series resonance power amplification circuit is connected with the voltage output end of multistage dc source; it also accepts to select signal from the frequency of Intellectualized monitoring subsystem; to holding circuit output protection signal; its signal output part directly is connected with power ultrasonic transducer; encourage it to send ultrasound wave, three voltage controling ends of multistage dc source are accepted the parallel control signal from the Intellectualized monitoring subsystem.
Described series resonance power amplification circuit is used the tuning amplification circuit formula, uses VMOS field effect transistor rate of doing work amplifying device, is operated in critical C class state.
Described series resonance power amplification circuit; the signal of the self-driven circuit of grid origin of VMOS field effect transistor MOSFET-IRF460 drives; build-out resistor R1 is attempted by between grid and the source electrode; source ground; drain electrode is passed through by L1; C1; the Γ type filter circuit that C2 forms and the voltage output end of multistage dc source join; the capacitor C 3 of eliminating clutter is attempted by between drain electrode and the source electrode; drain electrode also links to each other with coupling capacitor C 4; the other end of C4 links to each other with resonant inductance L2 or L3 through the contact J1A of relay J 1; the other end of L2 and resonant capacitance C5 join; the other end ground connection of C5; the other end of L3 and resonant capacitance C6 join; the other end ground connection of C6; power ultrasonic transducer is attempted by on resonant capacitance C5 or the C6 through the contact J1B of relay J 1; L2; it is the series resonance network of F1 that C5 and power ultrasonic transducer constitute resonant frequency; L3; it is the series resonance network of F2 that C6 and power ultrasonic transducer constitute resonant frequency; coupling capacitor C 4 and resonance capacitor C 5; C6 is composed in parallel by a plurality of electric capacity; resonant inductance L2; L3 is composed in parallel by a plurality of inductance; induction coil L4; the end ground connection of L5; their other end is connected with charging capacitor C7 through detector diode D1 or D2 respectively; the end ground connection of charging capacitor C7, the other end is received holding circuit.
The present invention has abandoned the push-pull type power amplification circuit of prior art, not only omitted heaviness in its structure, numerous and diverse power output transformer and used half power amplifying device less, and circuit becomes very simple; Its feed power supply (multistage dc source) becomes light and handy because of voltage reduces greatly; Its signal modulation circuit, drive circuit also become very simple because of the signal that only needs the output fixed amplitude.The present invention has increased the unexistent holding circuit of prior art, and circuit is very simple, but effect is remarkable.
Therefore, power ultrasonic transducer exciting circuit of the present invention can: the good selecting frequency characteristic of (one) series resonance power amplification circuit can become the square wave excitation conversion of signals with sine wave signal output frequently, and its resonance characteristic can make the amplitude of the sine wave signal of output be much higher than its drain electrode feed voltage, not as the conventional power amplifying circuit, the amplitude of output signal always is lower than the drain electrode feed voltage, unless it uses booster transformer output.(2) voltage amplitude of the power ultrasonic transducer pumping signal of series resonance power amplification circuit output directly depends on the output voltage of multistage dc source, and it has also determined the ultrasonic power of ultrasonic transducer output.By means of signal modulation circuit, can change the dutycycle of the power ultrasonic transducer pumping signal of series resonance power amplification circuit output, thereby make the ultrasonic power of output precisely controlled.The former is decided by the voltage selection, and the latter is decided by pwm signal, and both are all from the Intellectualized monitoring subsystem.(3) the series resonance network in the series resonance power amplification circuit can also make its output impedance and the input impedance of power ultrasonic transducer be complementary; thereby obtain the highest efficiency of transmission; particularly importantly; when both serious mismatches; it can also send mismatch signal; by the operation of holding circuit, signal modulation circuit auto shut off circuit, guarantee safety.
The power ultrasonic transducer exciting circuit thinking novelty of the present invention's design, circuit is simple, debugging is convenient, and the amplitude of the driving voltage of output can be several times as much as feed voltage, the equal may command of the amplitude of output signal and dutycycle, wave distortion is little, not only the work efficiency of circuit itself is very high, and and ultrasonic transducer between efficiency of transmission also very high, the circuit security of operation, control flexiblely, wide application prospect and market potential are arranged.
Description of drawings
Fig. 1 is a system of the present invention composition diagram.
Fig. 2 is the electrical schematic diagram of series resonance power amplification circuit of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing embodiments of the invention are described in further detail:
As shown in Figure 1, the present invention is made of first signal generating circuit, secondary signal generation circuit, storbing gate, signal modulation circuit, drive circuit, series resonance power amplification circuit, multistage dc source and each element circuit of holding circuit.The outfan of first signal generating circuit and secondary signal generation circuit is linked into the input of storbing gate respectively.Its outfan is linked into first input of signal modulation circuit.Second input of signal modulation circuit accepted the pulse width modulation (PWM) signal from the Intellectualized monitoring subsystem, and its 3rd input accepts self-protection circuit's signal, and its outfan is linked into the input of drive circuit.The outfan of drive circuit is linked into the signal input part of series resonance power amplification circuit.The feed input of series resonance power amplification circuit is connected with the voltage output end of multistage dc source; it also accepts to select signal from the frequency of Intellectualized monitoring subsystem; to holding circuit output mistermination signal; its signal output part directly is connected with power ultrasonic transducer, encourages it to send ultrasound wave.Three voltage controling ends of multistage dc source are accepted the parallel control signal from the Intellectualized monitoring subsystem.
Described first signal generating circuit, secondary signal generation circuit produce the continuous square-wave signal that frequency is F1, F2 respectively, in an embodiment, and F1=1MHz, F2=3.3MHz.Storbing gate adopts multistage AND circuit, and output frequency is the continuous square-wave signal of F1 or F2 under the signal controlling selecting from the frequency of Intellectualized monitoring subsystem.Signal modulation circuit comes down to one three and door, and three input signals are respectively: frequency is the continuous square-wave signal of F1 or F2; From the pwm signal of Intellectualized monitoring subsystem and the level controling signal that comes the self-protection circuit.Its output is a string by the synthetic square wave of pwm signal under the normal condition; when the serious mismatch of input impedance of the output impedance of series resonance power amplification circuit and power ultrasonic transducer; holding circuit output low level control signal; the output of signal modulation circuit is locked in high level, and the operation of auto shut off circuit is also sent the mismatch alarm signal.Drive circuit adopts by P raceway groove and N channel field-effect pipe, and in the present embodiment, the former is IRF640, and the latter is the complementary type amplifying circuit that IRF9540 combines, and to guarantee that enough drive currents are arranged, removes to drive the series resonance power amplification circuit.
As shown in Figure 2, the series resonance power amplification circuit is used the tuning amplification circuit formula, use VMOS field effect transistor rate of doing work amplifying device, be operated in critical C class state, the LC series resonance is adopted in output, load, promptly power ultrasonic transducer is attempted by on the resonant capacitance, and drain electrode is by multistage dc source feed.Its concrete circuit is: the signal of the self-driven circuit of grid origin of VMOS field effect transistor MOSFET-IRF460 drives, build-out resistor R1 is attempted by between grid and the source electrode, source ground, drain electrode is joined by the Γ type filter circuit be made up of L1, C1, C2 and the voltage output end of multistage dc source, the capacitor C 3 of eliminating clutter is attempted by between drain electrode and the source electrode, and drain electrode also links to each other with coupling capacitor C 4.The other end of C4 links to each other with resonant inductance L2 or L3 through the contact J1A of relay J 1, and the other end of L2 and resonant capacitance C5 join, the other end ground connection of C5, and the other end of L3 and resonant capacitance C6 join, the other end ground connection of C6.Load, promptly power ultrasonic transducer is attempted by on resonant capacitance C5 or the C6 through the contact J1B of relay J 1.It is the series resonance network of F1 that L2, C5 and power ultrasonic transducer constitute resonant frequency, and it is the series resonance network of F2 that L3, C6 and power ultrasonic transducer constitute resonant frequency.Coupling capacitor C 4 and resonance capacitor C 5, C6 can be composed in parallel by a plurality of electric capacity, and in an embodiment, C4 is composed in parallel by 4 identical electric capacity of capacitance, and C5 is composed in parallel by 5 identical electric capacity of capacitance, and C6 is composed in parallel by 4 identical electric capacity of capacitance.Resonant inductance L2, L3 also can be composed in parallel by a plurality of inductance, and in an embodiment, L2, L3 are composed in parallel by two different inductance of inductance value, and one of them is the adjustable variable inductance of inductance value.The end ground connection of induction coil L4, L5, their other end are connected with charging capacitor C7 through detector diode D1 or D2 respectively.The end ground connection of charging capacitor C7, the other end is received holding circuit.
The present invention utilizes the good selecting frequency characteristic of series resonance power amplification circuit that the square wave excitation conversion of signals is become with sine wave signal output frequently; and its resonance characteristic can make the amplitude of the sine wave signal of output be much higher than its drain electrode feed voltage; simultaneously; by resonant capacitance; the series resonance network that resonant inductance and power ultrasonic transducer constitute can also make the output impedance of series resonance power amplification circuit and the input impedance of ultrasonic transducer be complementary; thereby obtain the highest efficiency of transmission; particularly importantly; when both serious mismatches; the induced voltage that produces on induction coil is enough to make the holding circuit action; the operation of auto shut off circuit, and send the mismatch alarm signal to guarantee safety.On the other hand, because VMOS field effect transistor MOSFET-IRF460 is operated in critical C class state, the power attenuation of pipe itself is almost equal to zero, thereby work efficiency is very high.The output amplitude of series resonance power amplification circuit directly depends on its drain electrode feed voltage, i.e. the output voltage of multistage dc source, and it has also determined the ultrasonic power of ultrasonic transducer output.Simultaneously, because the series resonance power amplification circuit is operated in critical C class state, thus by means of signal modulation circuit, can change the dutycycle of its output signal easily, thus make the ultrasonic power of power ultrasonic transducer output precisely controlled.The former is decided by the voltage selection, and the latter is decided by pwm signal, and both are all from the Intellectualized monitoring subsystem.
Described multistage dc source is the switching power supply that can export different voltages, and in an embodiment, its output voltage range divides 8 grades of steppings between 24～45V; Be controlled by the Intellectualized monitoring subsystem.
Described holding circuit is a rest-set flip-flop, and its output state depends on the mismatch signal from the series resonance power amplification circuit.
Claims (7)
1. power ultrasonic transducer exciting circuit; it is characterized in that: by first signal generating circuit; secondary signal generation circuit; storbing gate; signal modulation circuit; drive circuit; the series resonance power amplification circuit; each element circuit of multistage dc source and holding circuit constitutes; the outfan of first signal generating circuit and secondary signal generation circuit is linked into the input of storbing gate respectively; the control end of storbing gate is accepted frequency and is selected signal; this signal is from the Intellectualized monitoring subsystem of malignant tumor ultrasound thermal therapy system; its outfan is linked into first input of signal modulation circuit; second input of signal modulation circuit accepted the pulse width modulation (PWM) signal from the Intellectualized monitoring subsystem; its the 3rd input accepts self-protection circuit's signal; its outfan is linked into the input of drive circuit; the outfan of drive circuit is linked into the signal input part of series resonance power amplification circuit; the feed input of series resonance power amplification circuit is connected with the voltage output end of multistage dc source; it also accepts to select signal from the frequency of Intellectualized monitoring subsystem; to holding circuit output protection signal; its signal output part directly is connected with power ultrasonic transducer; encourage it to send ultrasound wave, three voltage controling ends of multistage dc source are accepted the parallel control signal from the Intellectualized monitoring subsystem.
2. power ultrasonic transducer exciting circuit as claimed in claim 1 is characterized in that, described series resonance power amplification circuit is used the tuning amplification circuit formula, uses VMOS field effect transistor rate of doing work amplifying device, is operated in critical C class state.
3. as claim 1 or 2 described power ultrasonic transducer exciting circuits; it is characterized in that; described series resonance power amplification circuit; the signal of the self-driven circuit of grid origin of VMOS field effect transistor MOSFET-IRF460 drives; build-out resistor R1 is attempted by between grid and the source electrode; source ground; drain electrode is passed through by L1; C1; the Γ type filter circuit that C2 forms and the voltage output end of multistage dc source join; the capacitor C 3 of eliminating clutter is attempted by between drain electrode and the source electrode; drain electrode also links to each other with coupling capacitor C 4; the other end of C4 links to each other with resonant inductance L2 or L3 through the contact J1A of relay J 1; the other end of L2 and resonant capacitance C5 join; the other end ground connection of C5; the other end of L3 and resonant capacitance C6 join; the other end ground connection of C6; power ultrasonic transducer is attempted by on resonant capacitance C5 or the C6 through the contact J1B of relay J 1; L2; it is the series resonance network of F1 that C5 and power ultrasonic transducer constitute resonant frequency; L3; it is the series resonance network of F2 that C6 and power ultrasonic transducer constitute resonant frequency; coupling capacitor C 4 and resonance capacitor C 5; C6 is composed in parallel by a plurality of electric capacity; resonant inductance L2; L3 is composed in parallel by a plurality of inductance; induction coil L4; the end ground connection of L5; their other end is connected with charging capacitor C7 through detector diode D1 or D2 respectively; the end ground connection of charging capacitor C7, the other end is received holding circuit.
4. power ultrasonic transducer exciting circuit as claimed in claim 1 is characterized in that, described first signal generating circuit, secondary signal generation circuit produce the continuous square-wave signal that frequency is F1, F2 respectively.
5. power ultrasonic transducer exciting circuit as claimed in claim 1 is characterized in that described storbing gate adopts multistage AND circuit, and output frequency is the continuous square-wave signal of F1 or F2 under the signal controlling selecting from the frequency of Intellectualized monitoring subsystem.
6. power ultrasonic transducer exciting circuit as claimed in claim 1 is characterized in that, described signal modulation circuit is one three and door, and three input signals are respectively: frequency is the continuous square-wave signal of F1 or F2; From the pwm signal of Intellectualized monitoring subsystem and the level controling signal that comes the self-protection circuit.
7. power ultrasonic transducer exciting circuit as claimed in claim 1; it is characterized in that; described signal modulation circuit; its output under normal circumstances is a string by the synthetic square wave of pwm signal; when the serious mismatch of input impedance of the output impedance of series resonance power amplification circuit and power ultrasonic transducer; holding circuit output low level control signal is locked in high level with the output of signal modulation circuit, and the operation of auto shut off circuit is also sent the mismatch alarm signal.
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| CNB2004100532601A CN100462116C (en) | 2004-07-29 | 2004-07-29 | Power supersonic transducer exciting circuit |
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| CNB2004100532601A CN100462116C (en) | 2004-07-29 | 2004-07-29 | Power supersonic transducer exciting circuit |
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| CN1586672A true CN1586672A (en) | 2005-03-02 |
| CN100462116C CN100462116C (en) | 2009-02-18 |
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| CN102149429A (en) * | 2008-07-10 | 2011-08-10 | 康奈尔大学 | Ultrasound wave generating apparatus |
| CN102279385A (en) * | 2010-06-08 | 2011-12-14 | 中国科学院空间科学与应用研究中心 | High-linearity radiofrequency power detector |
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| FR2638532B1 (en) * | 1988-10-27 | 1991-07-26 | Edap Int | ULTRASONIC TREATMENT DEVICE USING FOCUSING AND OSCILLATING PIEZOELECTRIC CERAMIC |
| CN2087846U (en) * | 1990-08-11 | 1991-10-30 | 唐健 | Multi-passage ultrasonic telecontrol switch |
| CN1104002A (en) * | 1993-12-15 | 1995-06-21 | 许天昀 | Method for controlling resonance power conversion |
| AU2373695A (en) * | 1994-05-03 | 1995-11-29 | Board Of Regents, The University Of Texas System | Apparatus and method for noninvasive doppler ultrasound-guided real-time control of tissue damage in thermal therapy |
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| CN102279385A (en) * | 2010-06-08 | 2011-12-14 | 中国科学院空间科学与应用研究中心 | High-linearity radiofrequency power detector |
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| CN110811312A (en) * | 2018-08-07 | 2020-02-21 | 佛山市顺德区美的电热电器制造有限公司 | Cooking appliance and control device and control method thereof |
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| CN112754604B (en) * | 2019-11-05 | 2022-02-01 | 重庆迈科唯医疗科技有限公司 | Ultrasonic knife host, ultrasonic knife system and automatic matching method for impedance of transducer of ultrasonic knife system |
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Effective date of registration: 20170522 Address after: 200030 room 1, building 333, No. 492, Hongqiao Road, Shanghai, Xuhui District Patentee after: Zhonghui medical technology (Shanghai) Co., Ltd. Address before: 200240 Dongchuan Road, Shanghai, No. 800, No. Patentee before: Shanghai Jiao Tong University |
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Application publication date: 20050302 Assignee: Sano Aike Technology (Jiangsu) Co.,Ltd. Assignor: ZHONGHUI MEDICAL TECHNOLOGY (SHANGHAI) Co.,Ltd. Contract record no.: X2022310000008 Denomination of invention: Ultrasonic power transducer excitation circuit Granted publication date: 20090218 License type: Common License Record date: 20220228 |
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| EE01 | Entry into force of recordation of patent licensing contract |