Ultrasonic transducer excitation circuit with adjustable excitation voltage range

Abstract

The utility model discloses an ultrasonic transducer excitation circuit with an adjustable excitation voltage range, and belongs to the technical field of integrated circuits. Comprising a gate drive circuit and a transformer coupling circuit, the gate drive circuit comprises a single gate driver U1 and a filter capacitor C1, and the single gate driver U1 and the filter capacitor C1 are electrically connected in sequence; the transformer coupling circuit comprises a transformer T1, a diode D1, a diode D3, an MOS tube Q1, a resistor R2 and a resistor R3, the resistor R2 and the resistor R3 are electrically connected with the MOS tube Q1, the resistor R2 is further electrically connected with the single-gate driver U1, the MOS tube Q1 is electrically connected with the transformer T1, and the transformer T1 is electrically connected with the diode D1 and the diode D3. According to the utility model, the voltage amplitude of the excitation waveform and the excitation frequency of the waveform can be effectively enhanced, so that the initial signal amplitude of the transducer is greatly improved, the problem that the amplitude of the transducer is too small due to severe field working conditions is solved, and the normal metering of the ultrasonic flowmeter is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of integrated circuits, in particular to an ultrasonic transducer excitation circuit with an adjustable excitation voltage range. Background Art

[0002] As people's awareness of environmental protection has increased in recent years, natural gas has been increasingly used as a clean and high-quality energy source, and the natural gas industry has also developed rapidly. The main metering instruments in the natural gas industry are Roots meters and turbine meters, but these traditional instruments have the disadvantages of high requirements for metering quality, frequent maintenance, high maintenance costs, and low intelligence. These weaknesses will restrict the rapid development of the natural gas industry.

[0003] Compared with differential pressure meters, volumetric meters and traditional velocity meters, gas ultrasonic flow meters have the advantages of wide range ratio, intelligence, easy installation, low cost, high precision, long service life and low maintenance cost. At present, they are widely used in the following fields: 1) metering management of natural gas high-pressure long-distance pipelines and provincial and municipal sub-transmission stations; 2) urban gas metering management; 3) natural gas coalbed methane exploitation and utilization; 4) liquefied natural gas and liquefied petroleum gas; 5) large-scale industrial gas metering management; 6) blast furnace gas and coke oven gas metering; 7) other energy-saving and emission reduction gas emission metering, etc.

[0004] In practical applications, ultrasonic meters are often used in harsh environments, especially when testing large amounts of stolen gas in pipelines or testing gases such as carbon dioxide, which can cause great attenuation of ultrasonic signals. On the other hand, ultrasonic flow meters need to have a minimum receiving signal requirement to measure gas flow more accurately. If the received ultrasonic signal is too small, it will affect the normal measurement of the ultrasonic meter. Therefore, if the environment cannot be changed, the excitation waveform amplitude of the ultrasonic signal itself needs to be amplified. Utility Model Content

[0005] The purpose of the utility model is to provide an ultrasonic transducer excitation circuit with an adjustable excitation voltage range, which can greatly increase the excitation voltage of the transducer and can adjust the number of excitation signals, thereby maximally enhancing the waveform amplitude of the transducer.

[0006] To achieve the above object, the utility model provides an ultrasonic transducer excitation circuit with an adjustable excitation voltage range, comprising a gate drive circuit and a transformer coupling circuit, wherein the gate drive circuit and the transformer coupling circuit are electrically connected in sequence;

[0007] The gate drive circuit includes a single gate driver U1 and a filter capacitor C1, and the single gate driver U1 and the filter capacitor C1 are electrically connected in sequence;

[0008] The transformer coupling circuit includes a transformer T1, a diode D1, a diode D3, a MOS tube Q1, a resistor R2 and a resistor R3. The resistor R2 and the resistor R3 are electrically connected to the MOS tube Q1. The resistor R2 is also electrically connected to the single gate driver U1. The MOS tube Q1 is electrically connected to the transformer T1. The transformer T1 is electrically connected to the diode D1 and the diode D3 respectively.

[0009] Preferably, the single gate driver U1 adopts UCC27537DBVT with strong drive current source, strong drive current sink, low propagation delay and signal isolation.

[0010] Preferably, pin 3 of the single gate driver U1 is connected to a square wave generator pin for controlling the number of excitation waveforms.

[0011] Preferably, the MOS tube Q1 adopts an N-channel MOS tube IRF540N with low turn-on delay and low turn-off delay time.

[0012] Therefore, the utility model adopts the above-mentioned structure of an ultrasonic transducer excitation circuit with an adjustable excitation voltage range, which has the following beneficial effects:

[0013] The utility model can effectively enhance the voltage amplitude and the number of excitation waveforms of the excitation waveform, thereby greatly improving the initial signal amplitude of the transducer, solving the problem of too small transducer amplitude due to poor on-site working conditions, and thus ensuring normal measurement of the ultrasonic flowmeter.

[0014] The technical solution of the utility model is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model is a schematic diagram of the structure of an ultrasonic transducer excitation circuit with adjustable excitation voltage range. DETAILED DESCRIPTION

[0016] The technical solution of the utility model is further described below through the accompanying drawings and embodiments.

[0017] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" and the like mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0018] Example

[0019] like Figure 1 , the utility model provides an ultrasonic transducer excitation circuit with an adjustable excitation voltage range, including a gate drive circuit and a transformer coupling circuit, the gate drive circuit and the transformer coupling circuit are electrically connected in sequence;

[0020] The gate drive circuit includes a single gate driver U1 and a filter capacitor C1, and the single gate driver U1 and the filter capacitor C1 are electrically connected in sequence;

[0021] The transformer coupling circuit includes a transformer T1, a diode D1, a diode D3, a MOS tube Q1, a resistor R2 and a resistor R3. The resistors R2 and R3 are electrically connected to the MOS tube Q1. The resistor R2 is also electrically connected to the single gate driver U1. The MOS tube Q1 is electrically connected to the transformer T1. The transformer T1 is electrically connected to the diode D1 and the diode D3 respectively.

[0022] The single gate driver U1 uses the UCC27537DBVT with strong source current, strong sink current, low propagation delay and signal isolation.

[0023] The pin 3 of the single gate driver U1 is connected to the square wave generator pin to control the number of excitation waveforms. T1 is selected according to the voltage value required for excitation and the ratio of the number of primary and secondary coils is selected.

[0024] MOS tube Q1 adopts N-channel MOS tube IRF540N with low turn-on delay and low turn-off delay time.

[0025] Here’s how it works:

[0026] 1) First, the PULSE signal passes through the 3rd pin IN+ of the single-gate isolation driver U1, mainly through U1 to enhance the gate drive capability of the MOS tube Q1, thereby realizing the rapid turn-on and turn-off of the MOS tube;

[0027] 2) R2 is used as a current limiting resistor to prevent the Q1MOS tube from being damaged by overcurrent, and resistor R3 is used as a bias resistor to help the MOS tube Q1 turn on and off quickly. When the 4th pin of U1 outputs a high level, Q1 is turned on, and the +24V is grounded, thereby generating a level change from high to low in the primary coil of the transformer. The signal is transmitted to the secondary coil according to the electromagnetic induction effect, and the voltage amplification is adjusted according to Np:Ns. In order to prevent the primary coil of the transformer from being unable to fully release the electricity after one excitation, resulting in abnormal high-voltage excitation waveform output, a diode D3 is added to release the excess electricity in the primary coil.

[0028] 3) Diode D1 is used to ensure that when receiving the transducer signal on the opposite side, the transducer signal will not be directly pulled to the ground from pin 4 of transformer T1, thereby causing the receiving circuit to fail to receive the transducer.

[0029] Therefore, the utility model adopts the above-mentioned ultrasonic transducer excitation circuit with adjustable excitation voltage range, which can effectively enhance the voltage amplitude and the number of excitation waveforms of the excitation waveform, thereby greatly improving the initial signal amplitude of the transducer, solving the problem of the transducer amplitude being too small due to harsh on-site working conditions, and thus ensuring the normal measurement of the ultrasonic flowmeter.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that they can still modify or replace the technical solution of the utility model with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the utility model.

Claims

1. An ultrasonic transducer excitation circuit with adjustable excitation voltage range, characterized in that: It includes a gate drive circuit and a transformer coupling circuit, wherein the gate drive circuit and the transformer coupling circuit are electrically connected in sequence; The gate drive circuit includes a single gate driver U1 and a filter capacitor C1, and the single gate driver U1 and the filter capacitor C1 are electrically connected in sequence; The transformer coupling circuit includes a transformer T1, a diode D1, a diode D3, a MOS transistor Q1, a resistor R2 and a resistor R3. The resistor R2 and the resistor R3 are electrically connected to the MOS transistor Q1. The resistor R2 is also electrically connected to the single gate driver U1. The MOS transistor Q1 is electrically connected to the transformer T1. The transformer T1 is electrically connected to the diode D1 and the diode D3 respectively.

2. The ultrasonic transducer excitation circuit with adjustable excitation voltage range according to claim 1, characterized in that: The single gate driver U1 adopts UCC27537DBVT with strong driving current source, strong driving current sink, low propagation delay and signal isolation.

3. The ultrasonic transducer excitation circuit with adjustable excitation voltage range according to claim 1, characterized in that: Pin 3 of the single gate driver U1 is connected to the square wave generator pin for controlling the number of excitation waveforms.

4. The ultrasonic transducer excitation circuit with adjustable excitation voltage range according to claim 1, characterized in that: The MOS tube Q1 is an N-channel MOS tube IRF540N with low turn-on delay and low turn-off delay.

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