CN211275347U

CN211275347U - Ultrasonic transmitting circuit

Info

Publication number: CN211275347U
Application number: CN201921832633.3U
Authority: CN
Inventors: 赵学宽
Original assignee: Qingdao CCS Electric Corp
Current assignee: Qingdao CCS Electric Corp
Priority date: 2019-10-29
Filing date: 2019-10-29
Publication date: 2020-08-18
Anticipated expiration: 2029-10-29

Abstract

The utility model provides an ultrasonic transmitting circuit only needs to adopt triode Q1, electric capacity C1, electric capacity C2, resistance R1, resistance R2, resistance R3 and UC3843, can modulate the carrier frequency of output into ultrasonic probe's central resonant frequency, realizes ultrasonic signal's accurate transmission. The base of the triode Q1 is an enable terminal, the compensation function pin 1, the voltage feedback function pin 2 and the current sampling function pin 3 of the UC3843 are connected to the collector of the triode Q1, the first terminal of the capacitor C2 and the first terminal of the resistor R3, the RT/CT function pin 4 of the UC3843 is connected to the second terminal of the resistor R1 and the first terminal of the capacitor C1, the ground function pin 5 of the UC3843 is connected to the first terminal of the resistor R2 and the ground, and the second terminal of the resistor R2 is connected to the second terminal of the resistor R3 and the negative electrode of the ultrasonic probe; a power supply functional pin 7 of the UC3843 is connected to VCC, and a reference output functional pin 8 of the UC3843 is connected to a first end of the resistor R1; an output functional pin 6 of the UC3843 is an output end of the ultrasonic transmitting circuit, and is connected to an anode of the ultrasonic probe.

Description

Ultrasonic transmitting circuit

Technical Field

The utility model relates to an electronic circuit technical field especially relates to an ultrasonic emission circuit.

Background

The ultrasonic wave is a sound wave with the frequency higher than 20KHZ, has good directivity and strong penetrating power, is easy to obtain more concentrated sound energy, has long propagation distance in water, can be used for distance measurement, speed measurement, cleaning, welding, stone breaking, sterilization, disinfection and the like, and is widely applied to the fields of medicine, military, industry, agriculture and the like. The ultrasonic transmitting circuit in the prior art is generally pushed by a high-power triode and an ultrasonic generating circuit, and has the defects of complex circuit, difficulty in debugging and the like.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned defect of prior art, the utility model provides an ultrasonic emission circuit.

The utility model provides an ultrasonic transmitting circuit includes: the transistor Q1, the capacitor C1, the capacitor C2, the resistor R1, the resistor R2, the resistor R3 and the resistor UC 3843;

the base of the triode Q1 is an enable terminal, the collector of the triode Q1 is connected to the compensation function pin 1 of the UC3843, the voltage feedback function pin 2 of the UC3843, the current sampling function pin 3 of the UC3843, the first terminal of the capacitor C2 and the first terminal of the resistor R3, and the emitter of the triode Q1 is grounded; a first end of the resistor R1 is connected to the reference output functional pin 8 of UC3843, and a second end of the resistor R1 is connected to a first end of the capacitor C1 and the RT/CT functional pin 4 of UC 3843; a first end of the capacitor C1 is connected with a second end of the resistor R1 and the RT/CT functional pin 4 of the UC3843, and a second end of the capacitor C1 is connected with the emitter of the transistor Q1 and the ground; the first end of the resistor R2 is connected with the ground function pin 5 of the UC3843 and the ground, and the second end of the resistor R2 is connected with the second end of the resistor R3 and the negative electrode of the ultrasonic probe; a first end of the resistor R3 is connected to a collector of the transistor Q1, the compensation function pin 1 of the UC3843, the voltage feedback function pin 2 of the UC3843, the current sampling function pin 3 of the UC3843, and a first end of the capacitor C2, and a second end of the resistor R3 is connected to a second end of the resistor R2 and a negative electrode of the ultrasonic probe; a first end of the capacitor C2 is connected to the collector of the transistor Q1, the compensation function pin 1 of the UC3843, the voltage feedback function pin 2 of the UC3843, the current sampling function pin 3 of the UC3843, and a first end of the resistor R3, and a second end of the capacitor C2 is grounded; a compensation function pin 1 of the UC3843, a voltage feedback function pin 2 of the UC3843, and a current sampling function pin 3 of the UC3843 are connected to a collector of a transistor Q1, a first end of a capacitor C2, and a first end of a resistor R3, an RT/CT function pin 4 of the UC3843 is connected to a second end of a resistor R1 and a first end of a capacitor C1, a ground function pin 5 of the UC3843 is connected to a first end of a resistor R2 and ground, an output function pin 6 of the UC3843 is connected to an anode of the ultrasonic probe, a power supply function pin 7 of the UC3843 is connected to a power supply voltage VCC of the circuit, and a reference output function pin 8 of the UC3843 is connected to a first end of a resistor R1;

the output functional pin 6 of UC3843 is the output end of the ultrasonic wave transmitting circuit.

In the above circuit, the transistor Q1 is preferably an NPN-type transistor, the resistor R1 is 4.7K Ω, the capacitor C1 is 5.1pF, the resistor R2 is 10 Ω, the resistor R3 is 10K Ω, and the capacitor C2 is 0.01 μ F.

The utility model provides an ultrasonic transmitting circuit ingenious utilization high performance fixed frequency current mode controller UC3843 only adopts a triode just can realize the current limiting function of electric current, can realize accurate duty cycle control through a small amount of external resistance and electric capacity, modulates the carrier frequency of output into ultrasonic probe's central resonant frequency, realizes ultrasonic signal's accurate transmission. In addition, the ultrasonic transmitting circuit also has the characteristics of less devices, high circuit integration level, small PCB layout area of the devices and low implementation cost.

Drawings

Fig. 1 is a schematic structural diagram of an ultrasonic transmitting circuit provided by the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Fig. 1 is a schematic structural diagram of an ultrasonic transmitting circuit provided by the present invention. As shown in fig. 1, the utility model provides an ultrasonic wave transmitting circuit includes: the transistor Q1, the capacitor C1, the capacitor C2, the resistor R1, the resistor R2, the resistor R3 and the resistor UC 3843; the base of the triode Q1 is an enable terminal, the collector of the triode Q1 is connected to the compensation function pin 1 of the UC3843, the voltage feedback function pin 2 of the UC3843, the current sampling function pin 3 of the UC3843, the first terminal of the capacitor C2 and the first terminal of the resistor R3, and the emitter of the triode Q1 is grounded; a first end of the resistor R1 is connected to the reference output functional pin 8 of UC3843, and a second end of the resistor R1 is connected to a first end of the capacitor C1 and the RT/CT functional pin 4 of UC 3843; a first end of the capacitor C1 is connected with a second end of the resistor R1 and the RT/CT functional pin 4 of the UC3843, and a second end of the capacitor C1 is connected with the emitter of the transistor Q1 and the ground; the first end of the resistor R2 is connected with the ground function pin 5 of the UC3843 and the ground, and the second end of the resistor R2 is connected with the second end of the resistor R3 and the negative electrode of the ultrasonic probe; a first end of the resistor R3 is connected to a collector of the transistor Q1, the compensation function pin 1 of the UC3843, the voltage feedback function pin 2 of the UC3843, the current sampling function pin 3 of the UC3843, and a first end of the capacitor C2, and a second end of the resistor R3 is connected to a second end of the resistor R2 and a negative electrode of the ultrasonic probe; a first end of the capacitor C2 is connected to the collector of the transistor Q1, the compensation function pin 1 of the UC3843, the voltage feedback function pin 2 of the UC3843, the current sampling function pin 3 of the UC3843, and a first end of the resistor R3, and a second end of the capacitor C2 is grounded; a compensation function pin 1 of the UC3843, a voltage feedback function pin 2 of the UC3843, and a current sampling function pin 3 of the UC3843 are connected to a collector of a transistor Q1, a first end of a capacitor C2, and a first end of a resistor R3, an RT/CT function pin 4 of the UC3843 is connected to a second end of a resistor R1 and a first end of a capacitor C1, a ground function pin 5 of the UC3843 is connected to a first end of a resistor R2 and ground, an output function pin 6 of the UC3843 is connected to an anode of the ultrasonic probe, a power supply function pin 7 of the UC3843 is connected to a power supply voltage VCC of the circuit, and a reference output function pin 8 of the UC3843 is connected to a first end of a resistor R1; the output functional pin 6 of UC3843 is the output end of the ultrasonic wave transmitting circuit.

UC3843 is a high performance fixed frequency current mode controller, and has 8 functional pins, and the specific functions are as follows. Compensation function pin 1: the pin is the output of the error amplifier and can be used for loop compensation; voltage feedback function pin 2: the pin is the inverting input of the error amplifier and is typically connected to the switching power supply output through a resistor divider; current sampling function pin 3: a voltage proportional to the inductor current is connected to the input, and the pulse width modulator uses this information to disable the conduction of the output switch; RT/CT function pin 4: by connecting resistor RT to Vref and capacitor CT to ground, the oscillator frequency and maximum output duty cycle are made adjustable. The working frequency can reach 500 kHz; ground function pin 5: the pin is common ground for the control circuit and the power supply; output function pin 6: the output directly drives the gate of the power MOSFET, and peak current up to 1.OA is drawn and sunk through the pin; power supply function pin 7: the pin is a positive power supply for controlling the integrated circuit; reference output function pin 8: this pin is the reference output, which supplies the charging current to capacitor CT through resistor RT.

The utility model provides an ultrasonic transmitting circuit adopts triode Q1, electric capacity C1, electric capacity C2, resistance R1, resistance R2, resistance R3 and UC3843, charge to electric capacity C1 through resistance R1, and confirm the oscillation frequency, resistance R2 is sampling resistor, play the effect of current-limiting and overflow monitoring, overflow the signal and pass through the low pass filter circuit of resistance R3 and electric capacity C2, realize signal feedback. The output loop of the UC3843 is a push-pull structure, and high-power driving of the ultrasonic probe can be realized without driving processing. In a specific application, the transistor Q1 is preferably an NPN-type transistor, the resistor R1 is 4.7K Ω, the capacitor C1 is 5.1pF, the resistor R2 is 10 Ω, the resistor R3 is 10K Ω, and the capacitor C2 is 0.01 μ F. For example, when the ultrasonic probe is used, the ultrasonic signal can be accurately transmitted only by directly connecting the ultrasonic probe to the output function pin 6 of the UC3843 and modulating the output carrier frequency to the central resonant frequency 40KHz of the ultrasonic probe by controlling the enable end of the ultrasonic transmitting circuit.

To sum up, the utility model provides an ultrasonic emission circuit ingenious utilization high performance fixed frequency current mode controller UC3843 only adopts a triode just can realize the current-limiting function of electric current, can realize accurate duty cycle control through a small amount of external resistance and electric capacity, modulates the carrier frequency of output into ultrasonic transducer's central resonant frequency, realizes ultrasonic signal's accurate transmission. In addition, the ultrasonic transmitting circuit also has the characteristics of less devices, high circuit integration level, small PCB layout area of the devices and low implementation cost.

Finally, it should be noted that: the above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An ultrasonic transmission circuit, comprising: the transistor Q1, the capacitor C1, the capacitor C2, the resistor R1, the resistor R2, the resistor R3 and the resistor UC 3843;

the base of the triode Q1 is an enable terminal, the collector of the triode Q1 is connected to the compensation function pin 1 of the UC3843, the voltage feedback function pin 2 of the UC3843, the current sampling function pin 3 of the UC3843, the first terminal of the capacitor C2 and the first terminal of the resistor R3, and the emitter of the triode Q1 is grounded; a first end of the resistor R1 is connected to the reference output functional pin 8 of UC3843, and a second end of the resistor R1 is connected to a first end of the capacitor C1 and the RT/CT functional pin 4 of UC 3843; the second end of the capacitor C1 is connected with the emitter of the transistor Q1 and the ground; the first end of the resistor R2 is connected with the ground function pin 5 of the UC3843 and the ground, and the second end of the resistor R2 is connected with the second end of the resistor R3 and the negative electrode of the ultrasonic probe; the second end of the capacitor C2 is grounded; an output functional pin 6 of the UC3843 is connected to the anode of the ultrasonic probe, and a power functional pin 7 of the UC3843 is connected to a power supply voltage VCC of the circuit;

2. The circuit of claim 1, wherein the transistor Q1 is an NPN transistor.

3. The circuit of claim 2, wherein the resistor R1 is 4.7K Ω and the capacitor C1 is 5.1 pF.

4. The circuit of claim 3, wherein the resistor R2 is 10 Ω and the resistor R3 is 10kΩ.

5. The circuit of claim 4, wherein the capacitance C2 is 0.01 μ F.