CN201088625Y - Double closed loops controlling system of high frequency electrotome - Google Patents
Double closed loops controlling system of high frequency electrotome Download PDFInfo
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- CN201088625Y CN201088625Y CNU2007200765691U CN200720076569U CN201088625Y CN 201088625 Y CN201088625 Y CN 201088625Y CN U2007200765691 U CNU2007200765691 U CN U2007200765691U CN 200720076569 U CN200720076569 U CN 200720076569U CN 201088625 Y CN201088625 Y CN 201088625Y
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Abstract
The utility model discloses an electric knife double closed loop control system for accepting two set signal sets from a microprocessor, comprising a switching power supply, a high frequency power amplifier, an output loop, a first error amplifier and a second error amplifier, wherein, the two error amplifiers respectively carry out comparison and error amplification to the sampling signals of the switching power supply and the output loop, so that the electric knife output can be controlled in closed loop to be in accordance with the values of the two set signal sets. For adopting the double closed loop control system, which simultaneously samples the power supply (internal ring) of the high frequency power amplifier and the high frequency output (external ring), the utility model has the advantage that: the output can be precisely stabilized at the set value either under a single failure condition or under a normal condition, so that the normal operation can be carried out even when any ring is failed without resulting the safety problems in relation to the unstable output or serious off-gauge. The utility model can be used in the control circuit of the electric knife.
Description
Technical field:
This utility model relates to a kind of the operation with the output control system of high frequency electric knife, particularly relates to a kind of double closed-loop control system of high frequency electric knife output.
Background technology:
High frequency electric knife also claims high frequency surgical equipment, is a kind ofly to replace mechanical scalpel and cut electrosurgical unit with blood coagulation.When it contact with human body by the most advanced and sophisticated high-frequency high-voltage current that produces of procedures electrode tissue is heated, realization is to the separation of when injected organism tissue and solidify, and cuts and the hemostatic purpose thereby play.
The control that high frequency electric knife is exported at present compensates open loop control automatically from early stage nothing and develops into the closed loop control that can adjust and stablize output automatically, under normal condition, input by high frequency power amplifier drives control of amplitude monocycle or the control of power supply monocycle, can reach the purpose that output is stable at setting value.But along with medical operating to the improving constantly of high frequency electric knife safety, reliability requirement, also must be controlled or be limited for the output under the single failure state.More existing high frequency electric knives are reported to the police and are cut off the method for exporting the overproof enforcement of the output under the single failure state and guarantee safety, and this uses for actual operation and has brought inconvenience; Also there are some high frequency electric knives that the input of radio frequency power amplifier is driven amplitude and the control of power supply enforcement dicyclo thereof, with the output under the restriction single failure state, this is lower at radio frequency power amplifier and output loop efficient, particularly under the inconstant situation of efficient, unstable and insecure situation still might take place in actual output.
Summary of the invention:
At existing high frequency electric knife single failure state output instability is down controlled ineffective problem, the utility model proposes a kind of novel high frequency electric knife double closed-loop control system, it adopts is input voltage to the radio frequency power amplifier power supply simultaneously, electric current and power samples control (internal ring) and high-frequency output voltage, electric current and power samples control (outer shroud), a kind of like this double closed-loop control system is stablized the output of high frequency electric knife, this had both eliminated single failure state (for example arbitrary part breaks down in the closed loop) the overproof phenomenon of output down, can guarantee normally carrying out of medical operating again.Simultaneously, the Direct Sampling control to output has also improved output accuracy greatly.
The technical scheme in the invention for solving the technical problem is:
A kind of high frequency electric knife double closed-loop control system is accepted first group of setting signal and second group of setting signal from microprocessor, and it includes Switching Power Supply, high-frequency amplifier circuit, output loop, first error amplifier and second error amplifier; Described Switching Power Supply produces adjustable dc voltage with the power supply as follow-up high-frequency amplifier circuit under the control of first error amplifier; The dc energy that described high-frequency amplifier circuit provides Switching Power Supply is converted to high frequency output and send follow-up output loop; Described output loop carries out filter shape to the output of high-frequency amplifier circuit, produces the needed high-frequency high-voltage current output for used for medical procedures of high frequency electric knife; First group of setting signal that described first error amplifier is sent here the sampled signal and the microprocessor of Switching Power Supply made comparisons and error is amplified, thereby first closed loop control is carried out in output to high frequency electric knife, makes it consistent with first group of setting value; Second group of setting signal that described second error amplifier is sent here the sampling figure signal and the microprocessor of output loop output made comparisons and error is amplified, thereby second closed loop control is carried out in output to high frequency electric knife, makes it consistent with second group of setting value.
High frequency electric knife double closed-loop control system described in the utility model, its Switching Power Supply is a kind of by the half-bridge switch power source that pulse-width modulator is controlled, middle power MOS pipe is recommended driving, high-power MOS tube is made HF switch, high-frequency power transformer is made isolation coupling, and it contains rectification, filtering reaches the sample circuit to output voltage, electric current and power; Described high-frequency amplifier circuit be a kind of can self-adjusting high-power MOS full-bridge D class A amplifier A; Described output loop is the two LC resonance circuits of a kind of high Q-value, and it contains high-frequency output voltage, electric current and power samples translation circuit; Described first error amplifier and second error amplifier are made up of high-gain comparator and CMOS nor gate.
With existing open loop, the high frequency electric knife output control system of single closed loop or the control of radio frequency power amplifier dicyclo is compared, this utility model has adopted the voltage of radio frequency power amplifier power supply, electric current and power samples control (internal ring) and high-frequency output voltage, the double closed-loop control system of electric current and power samples control (outer shroud), it has under the single failure state and under the normal condition, output all can be stable at the advantage of setting value exactly, break down in arbitrary ring and do not hinder normally carrying out of medical operating, can not occur because of exporting instability or the serious overproof safety problem that causes.
Description of drawings:
Fig. 1 is a structural representation of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
The specific embodiment:
The utility model is described in further detail below in conjunction with specific embodiments and the drawings.
At first see also Fig. 1 structural representation of the present utility model.Diagram high frequency electric knife double closed-loop control system, acceptance is from first group of setting signal U1, I1 of microprocessor, P1 and second group of setting signal U2, I2, P2, and these two groups of setting signals are two groups of voltages, electric current and power setting signals that microprocessor (μ C) is sent.This high frequency electric knife double closed-loop control system includes Switching Power Supply 3, high-frequency amplifier circuit 4, output loop 5, first error amplifier 1 and second error amplifier 2; Wherein first error amplifier 1 is internal ring (first a closed loop) error amplifier, and second error amplifier 2 is outer shroud (second a closed loop) error amplifier.Described Switching Power Supply 3 produces adjustable dc voltage E with the power supply as follow-up high-frequency amplifier circuit 4 under the control of first error amplifier 1.The driving signal of described high-frequency amplifier circuit 4 is UD, and its dc energy that Switching Power Supply 3 is provided is converted to high frequency power signal Up and exports to follow-up output loop 5.The output Up of 5 pairs of high-frequency amplifier circuits 4 of described output loop carries out filter shape, produces the needed high-frequency high-voltage current output OUT (comprising power, voltage, electric current) for used for medical procedures of high frequency electric knife.First group of voltage, electric current and power setting signal U1, I1, the P1 that 1 pair of output voltage from Switching Power Supply 3 of described first error amplifier, electric current and power samples signal u1, i1, p1 and microprocessor are sent here makes comparisons and produces error amplification signal Δ 1, thereby first closed loop control is carried out in high frequency electric knife output, made it consistent with first group of setting value U1, I1, P1; Second group of setting signal U2, I2, P2 that sampling figure signal u2, i2, p2 and the microprocessor of 2 pairs of output loops of described second error amplifier, 5 outputs sent here makes comparisons and produces error amplification signal Δ 2, thereby second closed loop control is carried out in high frequency electric knife output, made it consistent with second group of setting value U2, I2, P2.
See also Fig. 2 circuit theory diagrams of the present utility model again.The Switching Power Supply 3 of described high frequency electric knife double closed-loop control system is a kind of by the half-bridge switch power source that pulse-width modulator (PWM) is controlled, two middle power MOS pipe is recommended driving, two high-power MOS tube is made HF switch, high-frequency power transformer is made isolation coupling, and it contains rectification, filtering reaches the sample circuit to output voltage, electric current and power.The DC-voltage supply that this Switching Power Supply 3 is produced by the rectification of civil power buffering, it is controlled by a pulse-width modulator U4, by the two power MOS pipe Q1 that merely hit, the push-pull circuit that Q2 and high frequency transformer T1 (distributing signal) form drives, by two high-power MOS tube Q3 and Q4, two groups of equal pressure drags hold R1, C1 and R2, the half-bridge switch that C2 and high-frequency power transformer T2 (isolation coupling) form, then by four high speed diode D1-D4 rectification, high frequency choke coil L1 and capacitor C 3, C4, C5 filtering produces the power supply of the direct current adjustable voltage E of 0-200V as follow-up high-frequency amplifier circuit 4.The pulse-width modulator U4 of this Switching Power Supply 3 is set in higher operating frequency (about 120KHZ), add high-quality device and circuit, can obtain 〉=85% efficient, output can reach more than the 500W, is enough to high-frequency amplifier circuit 4 power supplies for producing the output of 400W high frequency.Output voltage, the current sample that this Switching Power Supply 3 is comprised directly obtained (because of being the direct current signal that contains ripple component) on resistance, the power samples signal is obtained in a multiplier by voltage, electric current, specifically, adopt R3, R4 two electric resistance partial pressures to produce voltage sampling signal u1; Adopt high-power low resistance R5 to take out its current sampling signal i1; Adopt a multiplier U5 that output voltage, current sampling signal u1, i1 are transformed to power samples signal p1=u1 * i1.
Described high-frequency amplifier circuit 4 be a kind of can self-adjusting high-power MOS full-bridge D class high efficiency high frequency amplifier, it is by two groups of homophase, high-amplitude square wave drive (this utility model does not describe in detail) of out-phase in twos in twos, and the high frequency power signal of generation is sent into follow-up output loop 5 through transformer isolation.This high-frequency amplifier circuit 4 is by Switching Power Supply 3 power supplies, make the switching regulator high efficiency power amplifier by the full-bridge that four high-power MOS tube Q5-Q8 form, send here by high frequency transformer T3 two groups in twos homophase, the high-amplitude of out-phase drives signal UD (this utility model does not describe in detail) and drives in twos, by high-frequency power transformer T4 isolation coupling, the power signal Up that high-frequency amplifier circuit 4 is exported sends in the output loop 5.Why adopting full-bridge D class switching regulator to amplify, is the efficient (can reach more than 80%) in order to improve high-frequency amplifier circuit 4, and it should be strict that circuit design and device are selected, and particularly must satisfy its symmetry requirement.
Described output loop 5 is resonance circuits of the two LC filtering of a kind of high Q-value, and it contains high-frequency output voltage, electric current and power samples translation circuit, and the output that is produced send high frequency electric knife to use for medical operating.The shaping of two high-Q LC resonance circuit, filtering that this output loop 5 is made of L2, C9 and L3, C10, produce more purified sine wave (reduction HF leakage), capacitor C that outfan connects 11, C12 are the anti-low frequency stimulatings necessary (its value is restricted, and should must not consider simultaneously influences output waveform and power) of high frequency electric knife standard-required.In this utility model, sampling and translation circuit that a key component of output loop 5 is high-frequency output voltage, electric current, the output voltage sampled signal u2 that it comprised is obtained by high frequency transformer T5 coupling after by high voltagehigh frequency electric capacity and high-power noninductive resistance blood pressure lowering, and is transformed to real effective output voltage (direct current) through rms value converter; The output current sampled signal i2 that it comprised is obtained by HF current transformer T6, and is transformed to real effective output current (direct current) through rms value converter; The output sampled signal p2 that it comprised obtains after being multiplied each other in a multiplier by above-mentioned output voltage, current sample figure signal u2 and i2.Specifically, described output loop 5 usefulness cross-over connections are high frequency capacitance C13, C14 and noninductive resistance R8, R9 blood pressure lowering on two outfans, and high frequency transformer T5 isolation coupling, pay generation output voltage sampled signal on the limit resistance R 10 at high frequency transformer T5, send into the rms value converter U7 that a frequency response is higher than 8MHz, be transformed to real effective output voltage (direct current) u2; With going here and there in the HF current transformer T6 of output loop one end and paying limit resistance R 11, with the extraction of high frequency output current and be converted to voltage signal, send into the rms value converter U8 identical with U7, be transformed to real effective output current signal (direct current) i2; The real effective signal p2 of output then produces (p2=i2 * u2) by above voltage, current sample figure signal u2, i2 in a multiplier U6.
Described first error amplifier 1 is made up of high-gain comparator U1 (A-C) and CMOS three nor gate U3A, and described second error amplifier 2 is made up of high-gain comparator U2 (A-C) and CMOS three nor gate U3B.The voltage sampling signal u1 of aforementioned switches power supply 3 send the error amplifier U1A of first error amplifier 1 through R6, C6 filtering, current sampling signal i1 send error amplifier U1C through what R7, C7 filtering sent that the error amplifier U1B of first error amplifier 1, power samples signal p1 send first error amplifier 1; First group of voltage, electric current and power setting signal U1, I1, P1 that this voltage, electric current and power samples signal u1, i1, p1 send here with microprocessor (μ C) in error amplifier U1A, the U1B of first error amplifier 1, U1C respectively make comparisons, and carry out error and amplify, comprehensive through three nor gate U3A, produce first error signal Δ 1 (being actually high and low level signal), send into the input of pulse-width modulator (PWM) U4 of Switching Power Supply 3,3 work of gauge tap power supply, thereby the power supply of control high-frequency amplifier circuit 4 and high frequency output.Because U1 (A-C) employing high-gain comparator (〉=80db), control accuracy is very high, so the power of Switching Power Supply 3, voltage, electric current output accuracy and stability are just very high, response speed is also very fast, so high-frequency output voltage, electric current and power and setting value deviation will be very little.Second group of voltage, electric current and power setting signal U2, I2, P2 that the high-frequency output voltage of aforementioned output loop 5, electric current and power samples figure signal u2, i2 and p2 send here with microprocessor (μ C) in error amplifier U2A, the U2B of second error amplifier 2, U2C respectively make comparisons, and carry out error and amplify, U3B is comprehensive through another three nor gate, produce second error signal Δ 2 (also being high and low level signal), send into another input of pulse-width modulator (PWM) U4 of Switching Power Supply 3,3 work of gauge tap power supply, thereby the output of control high frequency.Because the used sampled signal of this closed loop (outer shroud) is to obtain from output loop 5, add that gain is equally very high, high-frequency output voltage, electric current and power are almost completely identical with the input setting value, although therefore deviation may appear in Switching Power Supply 3, high-frequency amplifier circuit 4 and output circuit 5, under the situation that this closed loop did not lose efficacy, output accuracy will be very high.In a word, because two closed loop gain height, response are fast, the efficient and high stability of high-frequency amplifier circuit 4 and output loop 5 particularly, final high-frequency output voltage, electric current and power and setting value deviation will be very little.
These two closed loop systems are not worked simultaneously under the normal condition, because outer shroud is directly exported sampling and control to high frequency, stability and precision are better than internal ring, therefore make the outer shroud priority task usually; Have only when outer shroud complete failure make output when overproof tendency is arranged internal ring just work, be stable in the set point to guarantee output, certainly, the internal ring inefficacy will can not influence output.In addition, must be at any time or periodically detect the working condition of inner and outer ring, in case losing efficacy appears in a certain ring, microprocessor (μ C) should send warning signal, and under the situation that does not influence normal use, ring carried out necessary maintenance, adjustment or repairing to losing efficacy.
Claims (5)
1. high frequency electric knife double closed-loop control system, acceptance is characterized in that from first group of setting signal and second group of setting signal of microprocessor: it includes Switching Power Supply (3), radio frequency power amplifier (4), output loop (5), first error amplifier (1) and second error amplifier (2); Described Switching Power Supply (3) produces adjustable dc voltage with the power supply as follow-up high-frequency amplifier circuit (4) under first error amplifier (1) control; The dc energy that described high-frequency amplifier circuit (4) provides Switching Power Supply (3) is converted to high frequency output and send follow-up output loop (5); Described output loop (5) carries out filter shape to the output of high-frequency amplifier circuit (4), produces the needed high-frequency high-voltage current output for used for medical procedures of high frequency electric knife; First group of setting signal that described first error amplifier (1) is sent here the sampled signal and the microprocessor of Switching Power Supply (3) made comparisons and error is amplified, thereby first closed loop control is carried out in output to high frequency electric knife, makes it consistent with first group of setting value; Second group of setting signal that described second error amplifier (2) is sent here the sampling figure signal and the microprocessor of output loop (5) output made comparisons and error is amplified, thereby second closed loop control is carried out in output to high frequency electric knife, makes it consistent with second group of setting value.
2. high frequency electric knife double closed-loop control system according to claim 1, it is characterized in that: described Switching Power Supply (3) is a kind of by the half-bridge switch power source that pulse-width modulator is controlled, middle power MOS pipe is recommended driving, high-power MOS tube is made HF switch, high-frequency power transformer is made isolation coupling, and it contains rectification, filtering reaches the sample circuit to output voltage, electric current and power.
3. high frequency electric knife double closed-loop control system according to claim 1 is characterized in that: described high-frequency amplifier circuit (4) be a kind of can self-adjusting high-power MOS full-bridge D class A amplifier A.
4. high frequency electric knife double closed-loop control system according to claim 1 is characterized in that: described output loop (5) is the two LC resonance circuits of a kind of high Q-value, and it contains high-frequency output voltage, electric current and power samples translation circuit.
5. high frequency electric knife double closed-loop control system according to claim 1 is characterized in that: described first error amplifier (1) and second error amplifier (2) are made up of high-gain comparator and CMOS nor gate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200765691U CN201088625Y (en) | 2007-11-09 | 2007-11-09 | Double closed loops controlling system of high frequency electrotome |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200765691U CN201088625Y (en) | 2007-11-09 | 2007-11-09 | Double closed loops controlling system of high frequency electrotome |
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| CN201088625Y true CN201088625Y (en) | 2008-07-23 |
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| CNU2007200765691U Expired - Fee Related CN201088625Y (en) | 2007-11-09 | 2007-11-09 | Double closed loops controlling system of high frequency electrotome |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103006317A (en) * | 2011-09-20 | 2013-04-03 | 常州先进制造技术研究所 | High-frequency cutter safety protection control system |
| CN103126763A (en) * | 2011-11-28 | 2013-06-05 | 常州先进制造技术研究所 | High-frequency blade full-closed loop safety protection control system |
| CN105517217A (en) * | 2016-01-28 | 2016-04-20 | 广州市铭慧机械股份有限公司 | Single chip microcomputer-controlled high frequency induction heating power supply |
| CN106849734A (en) * | 2017-03-15 | 2017-06-13 | 重庆西山科技股份有限公司 | The PCU Power Conditioning Unit of dual frequency radiosurgery |
| CN109350232A (en) * | 2018-12-10 | 2019-02-19 | 深圳华焊生物科技有限公司 | A kind of biological tissue's welding system |
| CN109662775A (en) * | 2018-12-10 | 2019-04-23 | 深圳华焊生物科技有限公司 | A kind of biological tissue's welding system and its control method |
| WO2021000541A1 (en) * | 2019-07-01 | 2021-01-07 | 广州易和医疗技术开发有限公司 | Dual-loop, automatic health managing, multi-output minimally invasive surgery system |
-
2007
- 2007-11-09 CN CNU2007200765691U patent/CN201088625Y/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103006317A (en) * | 2011-09-20 | 2013-04-03 | 常州先进制造技术研究所 | High-frequency cutter safety protection control system |
| CN103126763A (en) * | 2011-11-28 | 2013-06-05 | 常州先进制造技术研究所 | High-frequency blade full-closed loop safety protection control system |
| CN105517217A (en) * | 2016-01-28 | 2016-04-20 | 广州市铭慧机械股份有限公司 | Single chip microcomputer-controlled high frequency induction heating power supply |
| CN105517217B (en) * | 2016-01-28 | 2018-11-06 | 广州市铭慧机械股份有限公司 | A kind of microcontroller control high-frequency induction heating power |
| CN106849734A (en) * | 2017-03-15 | 2017-06-13 | 重庆西山科技股份有限公司 | The PCU Power Conditioning Unit of dual frequency radiosurgery |
| CN106849734B (en) * | 2017-03-15 | 2023-06-06 | 重庆西山科技股份有限公司 | Power regulator for radio frequency electric wave knife |
| CN109350232A (en) * | 2018-12-10 | 2019-02-19 | 深圳华焊生物科技有限公司 | A kind of biological tissue's welding system |
| CN109662775A (en) * | 2018-12-10 | 2019-04-23 | 深圳华焊生物科技有限公司 | A kind of biological tissue's welding system and its control method |
| WO2021000541A1 (en) * | 2019-07-01 | 2021-01-07 | 广州易和医疗技术开发有限公司 | Dual-loop, automatic health managing, multi-output minimally invasive surgery system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080723 Termination date: 20151109 |