CN204086402U

CN204086402U - High-frequency isolation impedance detection device

Info

Publication number: CN204086402U
Application number: CN201420475711.XU
Authority: CN
Inventors: 曾波; 申海朝; 严钧; 王荣军; 张协国; 孙立波; 孙利; 韩新春
Original assignee: Lepu Medical Technology Beijing Co Ltd
Current assignee: Lepu Medical Technology Beijing Co Ltd
Priority date: 2014-08-21
Filing date: 2014-08-21
Publication date: 2015-01-07
Anticipated expiration: 2024-08-21

Abstract

The utility model relates to a kind of high-frequency isolation impedance detection device, comprising: voltage, current ratio mutual inductor, effective value converter, analog to digital converter, sample circuit, digital isolating chip and single-chip microcomputer; Output voltage and current signal are isolated by voltage, current ratio mutual inductor; Output voltage and current signal are converted to corresponding voltage effective value and current effective value by RMS-DC converter circuit by effective value converter; Analog to digital converter carries out analog to digital conversion by 16 analog-digital converter for voltage effective values and current effective value; Sample circuit is sampled to the data after analog to digital conversion; Data after sampling are transferred to single-chip microcomputer by numeral isolating chip; Single-chip microcomputer calculates the data after sampling, obtains impedance value.The utility model accurately effectively can not only gather magnitude of voltage and the current value of power stage, for impedance computation provides reliable foundation, ensure that simultaneously circuit not by extraneous power supply fluctuation etc. other disturb.

Description

High-frequency isolation impedance detection device

Technical field

The utility model relates to technical field of medical instruments, particularly relates to a kind of high-frequency isolation impedance detection device.

Background technology

At present, the impedance variation of Medical high-frequency therapeutic equipment is the basis for estimation of doctor to ablation effect, the impedance rate of descent number percent before and after melting, and judges to melt whether reach requirement.The degree of accuracy of impedance measurement is directly connected to the result for the treatment of of operation, and when tissue temperature raises, its impedance reduces, if but organize overheated, then it can dewater and its impedance can increase, and this situation is very disadvantageous to patient, and the observation accurately in real time of impedance is necessary.

Utility model content

Technical problem to be solved in the utility model is, for the deficiencies in the prior art, how to provide a kind of high-frequency isolation impedance detection method, can precisely, the key issue of effective measurement impedance value.

For this purpose, the utility model proposes a kind of high-frequency isolation impedance detection device, comprising: voltage, current ratio mutual inductor, effective value converter, analog to digital converter, sample circuit, digital isolating chip and single-chip microcomputer;

Wherein, described voltage, current ratio mutual inductor, for isolating output voltage and current signal; Described effective value converter, for being converted to corresponding voltage effective value and current effective value by RMS-DC converter circuit by described output voltage and described current signal; Described analog to digital converter, for carrying out analog to digital conversion by 16 analog to digital converters to described voltage effective value and described current effective value; Described sample circuit, for sampling to the data after analog to digital conversion; Described digital isolating chip, for being transferred to single-chip microcomputer by the data after sampling; Described single-chip microcomputer, for calculating the described data after sampling, obtains impedance value.

Further, also comprise: attenuation module, for the described output voltage in firing frequency signal and described current signal being decayed in described RMS-DC converter circuit acceptable preset threshold range according to preset ratio by described voltage, current ratio mutual inductor.

Particularly, described sample circuit adopts isolation processing, and described sample circuit adopts the DC-DC module of isolation to power.

Particularly, described RMS-DC converter circuit is designed by the effective value measurement chip of ADI company, and wherein, chip bandwidth reaches 8MHz, and power-frequency is 470KHz.

Particularly, described voltage, current ratio mutual inductor are through isolation, and wherein, isolation voltage reaches 1500V.

A kind of high-frequency isolation impedance detection device disclosed in the utility model, mutual inductor isolation and amplifier voltage and current signal, through RMS-DC converter circuit, be converted to effective voltage value, again after 16 analog to digital conversion samplings, be transferred to single-chip microcomputer through isolating chip, the RMS-DC converter in the middle of this and analog to digital conversion part are all isolating, this also can be avoided external disturbance, ensures the real effectiveness of simulated data.

Accompanying drawing explanation

Can understanding feature and advantage of the present utility model clearly by reference to accompanying drawing, accompanying drawing is schematic and should not be construed as and carry out any restriction to the utility model, in the accompanying drawings:

Fig. 1 shows the structural representation of a kind of high-frequency isolation impedance detection device in the utility model embodiment.

Embodiment

Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail.

The utility model relates to a kind of impedance detection device of high-frequency treatment equipment, high frequency power signals is isolated, ratio decay, RMS to DC, analog to digital conversion sample circuit, voltage and current the whole process of calculating.

In order to better understand and apply the method based on radio-frequency power output detections that the utility model proposes, carry out the detailed description of following diagram and corresponding content, and the utility model does not limit to the detailed description of following diagram and corresponding content.

As shown in Figure 1, the utility model provides a kind of high-frequency isolation impedance detection device, comprising: voltage, current ratio mutual inductor, effective value converter, analog to digital converter, sample circuit, digital isolating chip and single-chip microcomputer.

Particularly, voltage, current ratio mutual inductor are used for output voltage and current signal to isolate, and wherein, voltage, current ratio mutual inductor are through isolation, and isolation voltage reaches 1500V; Effective value converter is used for, by RMS-DC converter circuit, output voltage and current signal are converted to corresponding voltage effective value and current effective value, wherein, RMS-DC converter circuit is designed by the effective value measurement chip of ADI company, and chip bandwidth reaches 8MHz, power-frequency is 470KHz.Particularly, the bandwidth of the RMS chip that true rms circuit adopts is 8MHz, and when frequency input signal is fixed, change the amplitude of signal, the corresponding relation of output valve is very good, and output signal is a magnitude of voltage.

Analog to digital converter is used for carrying out analog to digital conversion by 16 analog-digital converter for voltage effective values and current effective value, wherein, adopt 16 accurate ADC chips, the magnitude of voltage that true rms circuit exports is converted to digital quantity, effectively can ensure the voltage signal precision of sampling; Sample circuit is used for sampling to the data after analog to digital conversion, and wherein, sample circuit adopts isolation processing, and sample circuit adopts the DC-DC module of isolation to power.

Numeral isolating chip is used for the data after by sampling and is transferred to single-chip microcomputer, and special digital isolation and amplifier is also used in signal output, can effectively to suppress in circuit power swing on the impact of impedance, wherein, numeral isolating chip is a circuit communicated by electromagnetic coupled, can carry out data transmission reliably when meeting 1500V isolation voltage.

Single-chip microcomputer is used for the data after to sampling and calculates, and obtains impedance value.Particularly, the digital signal of voltage and current sample finally delivers to single-chip microcomputer, and single-chip microcomputer is calculated by voltage and current value, draws resistance value accurately.Wherein, voltage and current RMS-DC converter circuit, these two parts of analog to digital converter work under isolation, and the power supply of this part circuit is produced by the DC-DC module of an isolation, and the isolation voltage of isolation module also meets the insulation request of 1500V.Can effectively avoid interference the isolation of true rms circuit and analog to digital converter.

Further, be 470KHz owing to there being frequency in circuit, output power is that the radiofrequency signal of 10W exports, interference on circuit can be larger, also can have a great impact impedance measurement, the circuit through isolation is independently VDD-to-VSS, and the interference be subject to can reduce a lot, effectively can ensure accuracy and the validity of measured value, for providing basis for estimation more accurately when doctor is melted.

Above embodiment is only for illustration of the utility model; and be not limitation of the utility model; the those of ordinary skill of relevant technical field; when not departing from spirit and scope of the present utility model; can also make a variety of changes and modification; therefore all equivalent technical schemes also belong to category of the present utility model, and scope of patent protection of the present utility model should be defined by the claims.

Although describe embodiment of the present utility model by reference to the accompanying drawings, but those skilled in the art can make various modifications and variations when not departing from spirit and scope of the present utility model, such amendment and modification all fall into by within claims limited range.

Claims

1. a high-frequency isolation impedance detection device, is characterized in that, comprising: voltage, current ratio mutual inductor, effective value converter, analog to digital converter, sample circuit, digital isolating chip and single-chip microcomputer;

2. device as claimed in claim 1, it is characterized in that, also comprise: attenuation module, for the described output voltage in firing frequency signal and described current signal being decayed in described RMS-DC converter circuit acceptable preset threshold range according to preset ratio by described voltage, current ratio mutual inductor.

3. device as claimed in claim 1, is characterized in that, described sample circuit adopts isolation processing, and described sample circuit adopts the DC-DC module of isolation to power.

4. device as claimed in claim 1, it is characterized in that, described RMS-DC converter circuit is designed by the effective value measurement chip of ADI company, and wherein, chip bandwidth reaches 8MHz, and power-frequency is 470KHz.

5. device as claimed in claim 1, is characterized in that, described voltage, current ratio mutual inductor are through isolation, and wherein, isolation voltage reaches 1500V.