CN202798594U - Impedance transformer for high-frequency endotherm knife - Google Patents
Impedance transformer for high-frequency endotherm knife Download PDFInfo
- Publication number
- CN202798594U CN202798594U CN 201220497415 CN201220497415U CN202798594U CN 202798594 U CN202798594 U CN 202798594U CN 201220497415 CN201220497415 CN 201220497415 CN 201220497415 U CN201220497415 U CN 201220497415U CN 202798594 U CN202798594 U CN 202798594U
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- frequency
- wave generator
- square
- impedance transformer
- pole plate
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Abstract
An impedance transformer for a high-frequency endotherm knife comprises a square-wave generator, a resonance circuit, a constant current source, a switch detector and a pole plate monitor, wherein the square-wave generator is a intermediate-frequency oscillator with frequency adjustable and generates intermediate-frequency oscillation signals; the resonance circuit is connected with the square-wave generator and generates signals with the frequency the same as the intermediate-frequency oscillation signals generated by the square-wave generator; the constant current source is connected with the resonance circuit and supplies constant current to the resonance circuit; the switch detector is connected with the resonance circuit through a filter circuit and generates switch detection signals; and the pole plate monitor is connected with the switch detector and generates pole plate monitoring signals. The impedance transformer has the advantages of being small in working current and large in creepage distance, capable of ensuring static electro magnetic compatibility (EMC) and reducing interference on a comparator and suitable for various high-frequency operation devices including the high-frequency endotherm knife.
Description
Technical field
The utility model relates to a kind of circuit of detection and monitoring of high frequency surgical equipment, is specifically related to a kind of impedance transformer for electric knife, belongs to electronic technology field.
Background technology
The high frequency surgical equipment of clinical use generally all is provided with the circuit of detection in order to the operating state of monitoring equipment, for example is used for the impedance transformer of electric knife, and it generally comprises pole plate monitor and switch detector.Existing pole plate monitor adopts disresonance type full-bridge switch type impedance inverter circuit, and circuit more complicated, particularly operating current be large (more than the 5mA), is unfavorable for static EMC; And existing switch detector uses the chopper circuit power supply, the comparator that is in high frequency output is disturbed seriously, self-control high pressure optocoupler is adopted in its signal transmission, and shortcoming is creepage distance not (only about 20mm), and operating current is also more much bigger than pole plate monitor.
In a word, the existing impedance transformer that is used for electric knife has following deficiency: the required operating current of pole plate monitor and switch detector is excessive, is unfavorable for static EMC; Switch detector uses the chopper circuit power supply, makes the comparator that is in high frequency output disturbed serious; Self-control high pressure optocoupler is adopted in the signal transmission, and creepage distance is not enough.(be used for manual control and cut, coagulate, foot control is cut, coagulated the functions such as accessory identification) is necessary pole plate monitor and the switch detector of existing impedance transformer are improved in the more and more many situations of switch detector quantity.
The utility model content
The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, and a kind of impedance transformer for electric knife is provided, and its operating current is little, can guarantee static EMC, reduces the interference to comparator, has enough creepage distances.
For achieving the above object, the technical solution adopted in the utility model is:
A kind of impedance transformer for electric knife, it comprises:
Square-wave generator is for frequency adjustable mean frequency oscillator and produce the medium-frequency oscillator signal;
Resonant circuit, connection side's wave producer also produces the identical signal of medium-frequency oscillator signal that frequency and square-wave generator produce;
Constant-current source connects resonant circuit and supplies with constant electric current to resonant circuit;
Switch detector connects resonant circuit and produces the switch detection signal by filter circuit;
The pole plate monitor, the connecting valve detector also produces the pole plate monitor signal.
Described square-wave generator includes the middling speed transport and placing device and in order to adjust the variable resistor of frequency of oscillation.
Described resonant circuit includes an isolation coupling transformer, switching tube and some electric capacity, this isolation coupling transformer connecting valve pipe, and described square-wave generator connection also drives this switching tube.
Described constant-current source includes some resistance and two triodes.
Described switch detector and pole plate monitor are resonant mode single tube impedance inverter circuit.
The utlity model has following advantage:
1, operating current is little, can guarantee static EMC, and operating current of the present utility model is less than 1mA;
2, creepage distance is large, and the utility model does not use the high pressure optocoupler, thereby has increased creepage distance;
3, the utility model produces the pole plate monitor signal and the switch detection signal is consistent with existing cpu i/f requirement.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is theory diagram of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples.
Please in conjunction with consulting Fig. 1 and Fig. 2, diagram is used for the impedance transformer of electric knife in order to produce switch detection signal and pole plate monitor signal, and it comprises: square-wave generator 1, resonant circuit 2, constant-current source 3, switch detector 4 and pole plate monitor 5.
Described square-wave generator 1 is frequency adjustable mean frequency oscillator, in order to produce tens of KHZ to the medium-frequency oscillator signal of 100KHZ; This square-wave generator 1 includes middling speed transport and placing device, electric capacity and variable resistor, and this variable resistor is in order to adjust frequency of oscillation, make its with after the resonance frequency of the resonant circuit 2 that connects consistent.
Described resonant circuit 2 connection side's wave producers 1 also produce the identical signal of medium-frequency oscillator signal that frequency and square-wave generator 1 produce, this resonant circuit 2 includes an isolation coupling transformer, switching tube and some electric capacity, the voltage (becoming positive correlation with reflected resistance) that its impedance transformation with this isolation coupling transformer secondary is former limit.Described isolation coupling transformer connecting valve pipe, described square-wave generator 1 connection also drives this switching tube.In order to reduce temperature, frequency to the impact of magnetic capacity and resonance frequency and to improve stability, the magnetic core of this isolation coupling transformer adopts the magnetic core with air gap, strengthen the former limit number of turn and the former and deputy limit turn ratio as far as possible, suitably reduce gas length, to guarantee larger inductance value.
Described constant-current source 3 connects the isolation coupling transformer of resonant circuit 2, and it includes some resistance and two triodes.This constant-current source 3 adopts suitable biasing, and supplies with constant electric current to resonant circuit 2.
Described switch detector 4 connects resonant circuit 2 by filter circuit, and the voltage that resonant circuit 2 is produced produces the switch detection signal behind filter and amplification.
Described pole plate monitor 5 connecting valve detectors 4, and this switch detection signal added reciprocal transformation is amplified and suitably produce the pole plate monitor signal after the filtering.
Described switch detector 4 and pole plate monitor 5 belong to signal conversion circuit, are resonant mode single tube impedance inverter circuit, significantly to reduce operating current and to increase creepage distance.
Operation principle of the present utility model sees also Fig. 2, constant-current source 3 produces constant current and supplies with resonant circuit 2, square-wave generator 1 drives by switching tube, be the voltage on former limit with the impedance transformation of isolation coupling transformer secondary, after filtering, produce the switch detection signal, add again suitable filtering and reciprocal transformation amplification in this switch detection signal back and just can produce the pole plate monitor signal, reach consistent with existing cpu i/f requirement.
The utility model has solved existing pole plate monitor and the required operating current of switch detector is excessive, creepage distance is inadequate problem, can guarantee static EMC and reduce interference to comparator, is applicable to comprise all kinds of high frequency surgical equipment of electric knife.
Claims (5)
1. impedance transformer that is used for electric knife, it is characterized in that: described impedance transformer comprises:
Square-wave generator is for frequency adjustable mean frequency oscillator and produce the medium-frequency oscillator signal;
Resonant circuit, connection side's wave producer also produces the identical signal of medium-frequency oscillator signal that frequency and square-wave generator produce;
Constant-current source connects resonant circuit and supplies with constant electric current to resonant circuit;
Switch detector connects resonant circuit and produces the switch detection signal by filter circuit;
The pole plate monitor, the connecting valve detector also produces the pole plate monitor signal.
2. the impedance transformer for electric knife according to claim 1 is characterized in that: described square-wave generator includes the middling speed transport and placing device and in order to adjust the variable resistor of frequency of oscillation.
3. the impedance transformer for electric knife according to claim 1, it is characterized in that: described resonant circuit includes an isolation coupling transformer, switching tube and some electric capacity, this isolation coupling transformer connecting valve pipe, described square-wave generator connection also drives this switching tube.
4. the impedance transformer for electric knife according to claim 1, it is characterized in that: described constant-current source includes some resistance and two triodes.
5. the impedance transformer for electric knife according to claim 1, it is characterized in that: described switch detector and pole plate monitor are resonant mode single tube impedance inverter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220497415 CN202798594U (en) | 2012-09-26 | 2012-09-26 | Impedance transformer for high-frequency endotherm knife |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220497415 CN202798594U (en) | 2012-09-26 | 2012-09-26 | Impedance transformer for high-frequency endotherm knife |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202798594U true CN202798594U (en) | 2013-03-13 |
Family
ID=47825763
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220497415 Expired - Fee Related CN202798594U (en) | 2012-09-26 | 2012-09-26 | Impedance transformer for high-frequency endotherm knife |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202798594U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105866675A (en) * | 2016-06-06 | 2016-08-17 | 佛山市顺德区美的电热电器制造有限公司 | Device and method for detecting switch state |
-
2012
- 2012-09-26 CN CN 201220497415 patent/CN202798594U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105866675A (en) * | 2016-06-06 | 2016-08-17 | 佛山市顺德区美的电热电器制造有限公司 | Device and method for detecting switch state |
| CN105866675B (en) * | 2016-06-06 | 2019-07-23 | 佛山市顺德区美的电热电器制造有限公司 | The device and method of detection switch state |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130313 Termination date: 20200926 |