EP2312572A1 - Ultrasound converter - Google Patents

Ultrasound converter Download PDF

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Publication number
EP2312572A1
EP2312572A1 EP10010954A EP10010954A EP2312572A1 EP 2312572 A1 EP2312572 A1 EP 2312572A1 EP 10010954 A EP10010954 A EP 10010954A EP 10010954 A EP10010954 A EP 10010954A EP 2312572 A1 EP2312572 A1 EP 2312572A1
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EP
European Patent Office
Prior art keywords
generator
circuit
ultrasonic transducer
piezoelectric vibrating
vibrating element
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Granted
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EP10010954A
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German (de)
French (fr)
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EP2312572B1 (en
Inventor
Jürgen NIES
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Valeo Schalter und Sensoren GmbH
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Valeo Schalter und Sensoren GmbH
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/18—Details, e.g. bulbs, pumps, pistons, switches or casings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/0207—Driving circuits

Definitions

  • the invention relates to an ultrasonic transducer with a generator for generating the ultrasonic vibrations and an electrical circuit for adjusting the impedance of the generator to the impedance of a piezoelectric vibrating element, according to the preamble of claim 1.
  • ultrasonic transducers or sensors are well known.
  • each ultrasonic transducer emits an ultrasonic signal, which is reflected by a possible obstacle and can be received by ultrasonic sensors in the same ultrasonic transducer and or by other ultrasonic transducers or sensors.
  • a transformer with a parallel inductance with a defined transmission ratio is used.
  • the conventional design of this transformer with an iron-plated inductance makes it difficult to achieve a desirable flat design of the printed circuit board for the control electronics and thus of the complete ultrasonic transducer.
  • gyrator circuit can be used as an equivalent for an inductance for use in an impedance converter.
  • an inductance is virtually simulated with a semiconductor circuit connected with capacitors and resistors.
  • Such known gyrator circuits are used for example in the audio-frequency technology in equalizer circuits and sound controls.
  • an ultrasonic transducer As an object of the invention, it may be considered to optimize an ultrasonic transducer with respect to the mounting dimensions and at the same time to implement necessary circuitry measures.
  • an ultrasonic transducer with a generator for generating the ultrasonic vibrations and an electrical circuit for adjusting the impedance of the generator to the impedance of a piezoelectric vibrating element in the ultrasonic transducer according to the invention that for adapting the impedance of the generator to the piezoelectric vibrating element in the ultrasonic transducer in the electrical connection line between the generator and the piezoelectric vibrating element advantageously a Gyratorschab the generator and the piezoelectric vibrating element is connected in parallel as an impedance converter.
  • An advantageous application of the invention results when the ultrasonic transducer is part of an environment detection system for a parking assistance device in a vehicle.
  • the Gyratorsc preferably consists of a bipolar transistor, a FET (field effect transistor) or an operational amplifier, which is connected to its collector to the connecting line and its emitter grounded and thus parallel to the generator and the piezoelectric vibrating element and the base of the transistor from the connection point of an RC Series circuit activated which is also led from the connecting line to ground.
  • the preferred gyrator circuit is thus advantageously as a preferred embodiment, for example, a known bipolar transistor circuit in which the phase shift of the voltages between the control electrode (base) and the output (collector) is 180 °. If this gyrator circuit is then connected to a corresponding capacitance, then this circuit acts as an inductor and can then serve as a transformer.
  • this gyrator circuit can be used to generate a parallel resonant circuit together with the capacitance of the piezoelectric vibrating element of an ultrasonic transducer as a transformer without having to install an iron-core inductance.
  • FIG. 1 shows a drive circuit according to the invention for an ultrasonic transducer with a gyrator circuit as an impedance converter.
  • FIG. 1 is a drive circuit for an ultrasonic transducer can be seen, in which a generator G for generating the ultrasonic vibration, for example, in the range of 50 KHz works. Via a low-resistance resistor R7, the output signal of the generator G via a connecting line VL to a piezoelectric vibrating element PS as an essential part of the ultrasonic transducer, for example, for use in a parking assistance system in a vehicle out.
  • a generator G for generating the ultrasonic vibration for example, in the range of 50 KHz works.
  • a piezoelectric vibrating element PS as an essential part of the ultrasonic transducer
  • the iron-bonded inductance otherwise used in a conventional manner for a Transformer with a parallel inductance and with a defined transmission ratio replaced by a gyrator GS.
  • the gyrator circuit GS consists in the embodiment described here of a bipolar transistor Q1, which is connected to its collector directly to the connecting line VL and its emitter via a resistor R6 grounded and thus parallel to the generator G and the piezoelectric vibrating element PS.
  • the base of the transistor Q1 is driven via an RC series circuit of a resistor R5 and a capacitor C3, which is also led from the connecting line VL to ground.
  • This gyrator circuit GS thus causes the phase shift of the voltages between the control electrode (base) and the output (collector) is 180 °. If this gyrator circuit GS is then connected to a corresponding capacitance, in this case the capacitance of the piezoelectric oscillation element PS, then this circuit GS acts as an inductance and can then serve as a transformer.
  • the piezoelectric vibration element PS is characterized in a conventional manner by corresponding equivalent capacitances C1 and C2 and by an inductance L1 and a resistor R1.
  • a parallel circuit consisting of a high-resistance resistor R4 and a capacitor C4 is arranged for better simulation of the inductance for the transformer, which is also led from the connection line VL to ground.
  • circuits with a FET (field effect transistor) or an OP (operational amplifier) can be executed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Transducers For Ultrasonic Waves (AREA)

Abstract

The transducer has a generator (G) for generating ultrasonic vibrations and an electrical circuit for adjusting impedance of the generator to an impedance of piezoelectric vibrating element (PS) in the transducer. A gyrator circuit (GS) e.g. circuit with FET and operational amplifier, is switched parallel as an impedance converter to the generator and the piezoelectric vibrating element for adjusting the impedance of the generator at the piezoelectric vibrating element in an electric connection line (VL) between the generator and the piezoelectric vibrating element.

Description

Stand der TechnikState of the art

Die Erfindung betrifft einen Ultraschallwandler mit einem Generator zur Erzeugung der Ultraschallschwingungen und einer elektrischen Schaltung zur Anpassung der Impedanz des Generators an die Impedanz eines piezoelektrischen Schwingelements, gemäß dem Oberbegriff des Anspruchs 1.The invention relates to an ultrasonic transducer with a generator for generating the ultrasonic vibrations and an electrical circuit for adjusting the impedance of the generator to the impedance of a piezoelectric vibrating element, according to the preamble of claim 1.

Zur Umfelderkennung von Fahrzeugen, wie etwa zur Abstandsmessung während eines Einparkvorgangs zu vor und/oder seitlich neben und/oder hinter einem Fahrzeug befindlichen Objekten, sind Ultraschallwandler oder -sensoren hinlänglich bekannt. Beispielsweise werden aus der DE 102 37 721 A1 bekannte Umfelderkennungssysteme mit mindestens einem Ultraschallwandler aufgebaut, wobei jeder Ultraschallwandler ein Ultraschallsignal aussendet, welches von einem möglichen Hindernis reflektiert wird und von Ultraschallsensoren im gleichen Ultraschallwandler und oder von weiteren Ultraschallwandlern oder -sensoren empfangen werden können.For environment detection of vehicles, such as for distance measurement during a parking operation to front and / or laterally adjacent and / or behind a vehicle objects, ultrasonic transducers or sensors are well known. For example, from the DE 102 37 721 A1 known environment detection systems constructed with at least one ultrasonic transducer, each ultrasonic transducer emits an ultrasonic signal, which is reflected by a possible obstacle and can be received by ultrasonic sensors in the same ultrasonic transducer and or by other ultrasonic transducers or sensors.

Bei solchen serienmäßigen Ultraschallwandlern beispielsweise für Parkhilfe-Anwendungen bei Fahrzeugen wird zur Anpassung der Sendeendstufe des Generators in Bezug auf die 12V-Bordspannung des Fahrzeugs an das Piezo-Schwingelement des Ultraschallwandlers in der Regel ein Übertrager mit einer Parallelinduktivität mit einem definierten Übersetzungsverhältnis eingesetzt. Die herkömmliche Bauform dieses Übertragers mit einer eisenbehafteten Induktivität erschwert dabei eine wünschenswerte flache Bauweise der Leiterplatte für die Ansteuerungselektronik und somit des kompletten Ultraschallwandlers.In such standard ultrasonic transducers, for example, for parking assistance applications in vehicles to adapt the transmission output stage of the generator with respect to the vehicle 12V voltage to the piezoelectric vibrating element of the ultrasonic transducer usually a transformer with a parallel inductance with a defined transmission ratio is used. The conventional design of this transformer with an iron-plated inductance makes it difficult to achieve a desirable flat design of the printed circuit board for the control electronics and thus of the complete ultrasonic transducer.

Für sich gesehen ist aus der DE 692 09 358 T2 bekannt, dass als Äquivalent für eine Induktivität eine sogenannte Gyratorschaltung für die Anwendung in einem Impedanzwandler eingesetzt werden kann. Hierbei wird mit einer mit Kapazitäten und Widerständen beschalteten Halbleiterschaltung eine Induktivität quasi simuliert. Solche an sich bekannten Gyratorschaltungen werden beispielsweise auch in der NF-Audio-Technik in Entzerrerschaltungen und zur Klangregelungen eingesetzt.By itself, it is from the DE 692 09 358 T2 It is known that a so-called gyrator circuit can be used as an equivalent for an inductance for use in an impedance converter. In this case, an inductance is virtually simulated with a semiconductor circuit connected with capacitors and resistors. Such known gyrator circuits are used for example in the audio-frequency technology in equalizer circuits and sound controls.

Als eine Aufgabe der Erfindung kann es angesehen werden, einen Ultraschallwandler hinsichtlich der Einbaumaße zu optimieren und gleichzeitig dabei schaltungstechnisch notwendige Maßnahmen zu realisieren.As an object of the invention, it may be considered to optimize an ultrasonic transducer with respect to the mounting dimensions and at the same time to implement necessary circuitry measures.

Offenbarung der ErfindungDisclosure of the invention

Die Aufgabe wird bei einem Ultraschallwandler mit einem Generator zur Erzeugung der Ultraschallschwingungen und einer elektrischen Schaltung zur Anpassung der Impedanz des Generators an die Impedanz eines piezoelektrischen Schwingelements im Ultraschallwandler erfindungsgemäß dadurch gelöst, dass zur Anpassung der Impedanz des Generators an das piezoelektrische Schwingelement im Ultraschallwandler in der elektrischen Verbindungsleitung zwischen dem Generator und dem piezoelektrischen Schwingelement in vorteilhafter Weise eine Gyratorschaltung dem Generator und dem piezoelektrischen Schwingelement als Impedanzwandler parallel geschaltet ist.The object is achieved in an ultrasonic transducer with a generator for generating the ultrasonic vibrations and an electrical circuit for adjusting the impedance of the generator to the impedance of a piezoelectric vibrating element in the ultrasonic transducer according to the invention that for adapting the impedance of the generator to the piezoelectric vibrating element in the ultrasonic transducer in the electrical connection line between the generator and the piezoelectric vibrating element advantageously a Gyratorschaltung the generator and the piezoelectric vibrating element is connected in parallel as an impedance converter.

Eine vorteilhafte Anwendung der Erfindung ergibt sich, wenn der Ultraschallwandler Bestandteil eines Umfelderkennungssystem für eine Parkassistenzvorrichtung in einem Fahrzeug ist.An advantageous application of the invention results when the ultrasonic transducer is part of an environment detection system for a parking assistance device in a vehicle.

Die Gyratorschaltung besteht vorzugsweise aus einem bipolaren Transistor, einem FET (Feldeffekttransistor) oder einem Operationsverstärker, der mit seinem Kollektor an der Verbindungsleitung und mit seinem Emitter an Masse und somit parallel zum Generator und zum piezoelektrischen Schwingelement liegt und die Basis des Transistors vom Verbindungspunkt einer RC-Reihenschaltung angesteuert wird, die ebenfalls von der Verbindungsleitung nach Masse geführt ist. Die hier bevorzugte Gyratorschaltung ist somit in vorteilhafter Weise als bevorzugte Ausführungsform zum Beispiel eine an sich bekannte bipolare Transistorschaltung, bei der die Phasenverschiebung der Spannungen zwischen der Steuerelektrode (Basis) und dem Ausgang (Kollektor) 180° beträgt. Wird diese Gyratorschaltung dann mit einer entsprechenden Kapazität beschaltet, wirkt dann diese Schaltung wie eine Induktivität und kann dann als Übertrager dienen. Diese Schaltungseigenschaften führen damit in vorteilhafter Weise dazu, dass diese Gyratorschaltung zur Erzeugung eines Parallelresonanzkreises zusammen mit der Kapazität des piezoelektrischen Schwingelements eines Ultraschallwandlers als Übertrager benutzt werden kann, ohne eine eisenbehaftete Induktivität einbauen zu müssen.The Gyratorschaltung preferably consists of a bipolar transistor, a FET (field effect transistor) or an operational amplifier, which is connected to its collector to the connecting line and its emitter grounded and thus parallel to the generator and the piezoelectric vibrating element and the base of the transistor from the connection point of an RC Series circuit activated which is also led from the connecting line to ground. The preferred gyrator circuit is thus advantageously as a preferred embodiment, for example, a known bipolar transistor circuit in which the phase shift of the voltages between the control electrode (base) and the output (collector) is 180 °. If this gyrator circuit is then connected to a corresponding capacitance, then this circuit acts as an inductor and can then serve as a transformer. These circuit properties thus advantageously lead to this gyrator circuit can be used to generate a parallel resonant circuit together with the capacitance of the piezoelectric vibrating element of an ultrasonic transducer as a transformer without having to install an iron-core inductance.

Zwischen der Gyratorschaltung und dem piezoelektrischen Schwingelement kann dabei zu besseren Simulation der Induktivität noch eine Parallelschaltung aus einem Widerstand und einer Kapazität angeordnet werden, die von der Verbindungsleitung nach Masse geführt ist.Between the gyrator circuit and the piezoelectric oscillating element can be arranged for better simulation of the inductance nor a parallel circuit of a resistor and a capacitor, which is guided by the connecting line to ground.

Kurze Beschreibung der ZeichnungShort description of the drawing

Die Erfindung wird nachfolgend anhand eines Ausführungsbeispiels näher erläutert, wobei
Figur 1 eine erfindungsgemäße Ansteuerschaltung für einen Ultraschallwandler mit einer Gyratorschaltung als Impedanzwandler zeigt.The invention will be explained in more detail with reference to an embodiment, wherein
FIG. 1 shows a drive circuit according to the invention for an ultrasonic transducer with a gyrator circuit as an impedance converter.

Weg zur Ausführung der ErfindungWay to carry out the invention

Aus Figur 1 ist eine Ansteuerschaltung für einen Ultraschallwandler ersichtlich, bei der ein Generator G zur Erzeugung der Ultraschallschwingung beispielsweise im Bereich von 50 KHz arbeitet. Über einen niederohmigen Widerstand R7 ist das Ausgangssignal des Generators G über eine Verbindungsleitung VL zu einem piezoelektrische Schwingelement PS als wesentlichem Bestandteil des Ultraschallwandlers, beispielsweise zur Anwendung in einem Parkassistenzsystem in einem Fahrzeug, geführt.Out FIG. 1 is a drive circuit for an ultrasonic transducer can be seen, in which a generator G for generating the ultrasonic vibration, for example, in the range of 50 KHz works. Via a low-resistance resistor R7, the output signal of the generator G via a connecting line VL to a piezoelectric vibrating element PS as an essential part of the ultrasonic transducer, for example, for use in a parking assistance system in a vehicle out.

Zur Anpassung der Sendeendstufe des Generators G an die Verhältnisse im hier nicht dargestellten Fahrzeug, zum Beispiel aufgrund der 12V-Bordspannung des Fahrzeugs, an das piezoelektrische Schwingelement PS des Ultraschallwandlers, ist gemäß des hier gezeigten Ausführungsbeispiels die sonst in herkömmlicher Weise verwendete eisenbehaftete Induktivität für einen Übertrager mit einer Parallelinduktivität und mit einem definierten Übersetzungsverhältnis durch eine Gyratorschaltung GS ersetzt.In order to adapt the transmission output stage of the generator G to the conditions in the vehicle, not shown here, for example due to the vehicle's 12V vehicle voltage, to the piezoelectric oscillating element PS of the ultrasonic transducer, according to the embodiment shown here, the iron-bonded inductance otherwise used in a conventional manner for a Transformer with a parallel inductance and with a defined transmission ratio replaced by a gyrator GS.

Die Gyratorschaltung GS besteht bei dem hier beschriebenen Ausführungsbeispiel aus einem bipolaren Transistor Q1, der mit seinem Kollektor direkt an der Verbindungsleitung VL und mit seinem Emitter über einen Widerstand R6 an Masse und somit parallel zum Generator G und zum piezoelektrischen Schwingelement PS liegt. Die Basis des Transistors Q1 wird über eine RC-Reihenschaltung aus einem Widerstand R5 und einer Kapazität C3 angesteuert, die ebenfalls von der Verbindungsleitung VL nach Masse geführt ist.The gyrator circuit GS consists in the embodiment described here of a bipolar transistor Q1, which is connected to its collector directly to the connecting line VL and its emitter via a resistor R6 grounded and thus parallel to the generator G and the piezoelectric vibrating element PS. The base of the transistor Q1 is driven via an RC series circuit of a resistor R5 and a capacitor C3, which is also led from the connecting line VL to ground.

Diese Gyratorschaltung GS bewirkt somit, dass die Phasenverschiebung der Spannungen zwischen der Steuerelektrode (Basis) und dem Ausgang (Kollektor) 180° beträgt. Wird diese Gyratorschaltung GS dann mit einer entsprechenden Kapazität, hier die Kapazität des piezoelektrischen Schwingungselements PS, beschaltet, dann wirkt diese Schaltung GS wie eine Induktivität und kann dann als Übertrager dienen.This gyrator circuit GS thus causes the phase shift of the voltages between the control electrode (base) and the output (collector) is 180 °. If this gyrator circuit GS is then connected to a corresponding capacitance, in this case the capacitance of the piezoelectric oscillation element PS, then this circuit GS acts as an inductance and can then serve as a transformer.

Das piezoelektrische Schwingungselement PS ist dabei in herkömmlicher Weise durch entsprechende Ersatzkapazitäten C1 und C2 sowie durch eine Induktivität L1 und einen Widerstand R1 gekennzeichnet.The piezoelectric vibration element PS is characterized in a conventional manner by corresponding equivalent capacitances C1 and C2 and by an inductance L1 and a resistor R1.

Zwischen der Gyratorschaltung GS und dem piezoelektrischen Schwingelement PS ist zur besseren Simulation der Induktivität für den Übertrager noch eine Parallelschaltung aus einem hochohmigen Widerstand R4 und einer Kapazität C4 angeordnet, die ebenfalls von der Verbindungsleitung VL nach Masse geführt ist. Als weitere Ausführungsbeispiele sind auch Schaltungen mit einem FET (Feldeffekttransistor) oder einem OP (Operationsverstärker) ausführbar.Between the gyrator circuit GS and the piezoelectric oscillating element PS, a parallel circuit consisting of a high-resistance resistor R4 and a capacitor C4 is arranged for better simulation of the inductance for the transformer, which is also led from the connection line VL to ground. As further embodiments, circuits with a FET (field effect transistor) or an OP (operational amplifier) can be executed.

Claims (5)

Ultraschallwandler mit einem Generator (G) zur Erzeugung der Ultraschallschwingungen und einer elektrischen Schaltung zur Anpassung der Impedanz des Generators (G) an die Impedanz eines piezoelektrischen Schwingelements (PS) im Ultraschallwandler, dadurch gekennzeichnet, dass zur Anpassung der Impedanz des Generators (G) an das piezoelektrische Schwingelement (PS) im Ultraschallwandler in der elektrischen Verbindungsleitung (VL) zwischen dem Generator (G) und dem piezoelektrischen Schwingelement (PS) eine Gyratorschaltung (GS) als Impedanzwandler dem Generator (G) und dem piezoelektrische Schwingelement (PS) parallelgeschaltet ist.Ultrasonic transducer having a generator (G) for generating the ultrasonic vibrations and an electrical circuit for adjusting the impedance of the generator (G) to the impedance of a piezoelectric vibrating element (PS) in the ultrasonic transducer, characterized in that for adapting the impedance of the generator (G) the piezoelectric vibrating element (PS) in the ultrasonic transducer in the electrical connecting line (VL) between the generator (G) and the piezoelectric vibrating element (PS) a gyrator circuit (GS) as an impedance converter to the generator (G) and the piezoelectric vibrating element (PS) is connected in parallel. Ultraschallwandler nach Anspruch 1, dadurch gekennzeichnet, dass die Gyratorschaltung (GS) aus einem bipolaren Transistor (Q1) besteht, der mit seinem Kollektor an der Verbindungsleitung (VL) und mit seinem Emitter an Masse und somit parallel zum Generator (G) und zum piezoelektrischen Schwingelement (PS) liegt und die Basis des Transistors (Q1) vom Verbindungspunkt einer RC-Reihenschaltung (R5,C3) angesteuert wird, die ebenfalls von der Verbindungsleitung (VL) nach Masse geführt ist.Ultrasonic transducer according to claim 1, characterized in that the gyrator circuit (GS) consists of a bipolar transistor (Q1) with its collector to the connecting line (VL) and with its emitter grounded and thus parallel to the generator (G) and the piezoelectric Oscillating element (PS) is located and the base of the transistor (Q1) from the connection point of an RC series circuit (R5, C3) is driven, which is also guided from the connecting line (VL) to ground. Ultraschallwandler nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass zwischen der Gyratorschaltung (GS) und dem piezoelektrischen Schwingelement (PS) noch eine Parallelschaltung aus eine Widerstand (R4) und einer Kapazität (C4) von der Verbindungsleitung (VL) nach Masse geführt ist.Ultrasonic transducer according to claim 1 or 2, characterized in that between the gyrator (GS) and the piezoelectric vibrating element (PS) nor a parallel circuit of a resistor (R4) and a capacitor (C4) from the connecting line (VL) is guided to ground. Ultraschallwandler nach Anspruch 1, dadurch gekennzeichnet, dass als Gyratorschaltung (GS) eine Schaltung mit einem FET (Feldeffekttransistor) oder einem OP (Operationsverstärker) verwendet wird.Ultrasonic transducer according to claim 1, characterized in that a circuit with a FET (field effect transistor) or an OP (operational amplifier) is used as the gyrator circuit (GS). Anwendung des Ultraschallwandlers nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Ultraschallwandler Bestandteil eines Umfelderkennungssystem für eine Parkassistenzvorrichtung in einem Fahrzeug ist.Application of the ultrasonic transducer according to one of the preceding claims, characterized in that the ultrasonic transducer is part of an environment detection system for a parking assistance device in a vehicle.
EP20100010954 2009-10-08 2010-09-28 Ultrasound converter Active EP2312572B1 (en)

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EP3537177A1 (en) * 2018-03-07 2019-09-11 ELMOS Semiconductor AG Device and method for transducer-free control of an ultrasonic transducer

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US11832523B2 (en) * 2020-10-20 2023-11-28 Cirrus Logic Inc. Driver circuitry comprising active inductor circuitry for driving piezoelectric transducers

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EP3537177A1 (en) * 2018-03-07 2019-09-11 ELMOS Semiconductor AG Device and method for transducer-free control of an ultrasonic transducer
CN110238016A (en) * 2018-03-07 2019-09-17 艾尔默斯半导体股份公司 Operation circuit and operating method for energy converter
CN110238016B (en) * 2018-03-07 2021-11-16 艾尔默斯半导体欧洲股份公司 Operating circuit and operating method for a transducer

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DE102009048779A1 (en) 2011-04-14

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