Ultrasonic front-end circuit and ophthalmological B-ultrasonic system

Abstract

The invention discloses an ultrasonic front-end circuit and ophthalmological B-ultrasonic system, which comprise a circuit board and a probe, and a single chip microcomputer, an isolation protection circuit and the ultrasonic front-end circuit are arranged on the circuit board; the single-chip microcomputer outputs a first pulse emission signal, a second pulse emission signal and a third pulse emission signal, and outputs a first pulse emission control signal, a second pulse emission control signal and a third pulse emission control signal after being isolated by the isolation protection circuit. And the ultrasonic front-end circuit performs level conversion on the first pulse emission control signal, the second pulse emission control signal and the third pulse emission control signal, loads positive and negative excitation voltages to form a high-voltage excitation signal, and excites a transducer in the probe to generate a corresponding ultrasonic signal. The transducer is excited bypositive and negative excitation voltages, the excitation voltage is reduced by half, the universality and replaceability of device selection of a power supply and an ultrasonic front-end circuit aregreatly improved, and the problem that the device selection is limited due to the fact that the existing ophthalmological B-ultrasonic is only provided with positive high voltage can be solved.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to an ultrasonic front-end circuit and an ophthalmic B-ultrasound system. Background technique [0002] The ultrasonic front-end circuit of the existing ophthalmic B-ultrasound is as follows: figure 1 As shown, where +HV is the emission excitation voltage, the MOS tube is the electronic switch for emission control, and the capacitor is a high-voltage capacitor. The ophthalmic B-ultrasound transmission control unit gives a pulse transmission signal to control the on-off of the MOS tube. When the MOS tube is turned on, the excitation voltage is applied to the transducer TR, and the ultrasonic wave is generated by the piezoelectric effect, thereby completing an ultrasonic transmission. [0003] However, since the ophthalmic B-ultrasound probe uses a single-crystal transducer with a diameter of 9mm and a large static capacitance, a high excitation voltage is required, and the theor...

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Problems solved by technology

[0006] In view of the shortcomings of the prior art above, the purpose of the present invention is to provide an ultrasonic front-end circuit and an ophthalmic B-ultrasound system to solve the problem that the excitation high voltage of the existing ophthalmic B-ultrasound is only positive high voltage, which leads to limited device selection.

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