CN2138478Y

CN2138478Y - Power controller for micro wave surgical instrument

Info

Publication number: CN2138478Y
Application number: CN 92233839
Authority: CN
Inventors: 向婉成; 龙蔚泓; 李强
Original assignee: Tianjin University
Current assignee: Tianjin University
Priority date: 1992-09-25
Filing date: 1992-09-25
Publication date: 1993-07-21
Anticipated expiration: 2002-09-25

Abstract

The utility model discloses a power controller for a micro wave surgical instrument. In the device, sampling resistors [1] are respectively connected with a bridge rectifier and an A/D convertor [6] of the an anode circuit a permatron [4]; monolithic computers [5] are respectively connected with an AC solid state relay [3], the A/D convertor [6] and an AC zero-crossing detector circuit [7]; the AC zero-crossing detector circuit [7] is connected with an AC power supply. The utility model eliminates the harmful effect of the fluctuation of supply voltage on output power. The variation response to power supply voltage is rapid, thus, when operation, the control of the utility model over the power of micro-wave is timely.

Description

Power controller for micro wave surgical instrument

This utility model relates to the output control device that the microwave operation instrument is used.

Russian Patent discloses a kind of microwave output power control device for No. 940387.This device comprises microwave tube, high-tension transformer, bridge rectifier, relay, transistor etc., though this device is the controlled microwave output to a certain extent, its weak point is low precision, and response time is slow, thereby can not be as the output control device of microwave operation instrument.

The purpose of this utility model is to overcome shortcoming of the prior art, provide a kind of energy fast, the accurate device of controlled microwave power, it is thereby timely to the control of microwave power during operation to the variation response of supply voltage fast.

Device of the present utility model contains magnetron, high-tension transformer and bridge rectifier, sampling resistor ［ 1 ］ connects anode circuit, A/D converter ［ 6 ］ and the bridge rectifier of magnetron ［ 4 ］ respectively, single-chip microcomputer ［ 5 ］ connects ac solid relay ［ 3 ］ respectively, A/D converter ［ 6 ］ and ac zero-crossing detection circuit ［ 7 ］, ac zero-crossing detection circuit ［ 7 ］ connects alternating current power supply.

The filter capacitor of described sampling resistor ［ a 1 ］ low capacity preferably in parallel.

The utility model will be further described below in conjunction with accompanying drawing.

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the circuit diagram of alternating current zero crossing bolt slowdown monitoring circuit ［ 7 ］.

In the drawings, sampling resistor ［ 1 ］ is serially connected in the anode circuit of magnetron ［ 4 ］.The potentiometer of the available 20 ohm of 3W of sampling resistor ［ 1 ］, magnetron ［ 4 ］ can adopt CK1444.The anode current signal is reflecting the output of magnetron ［ 4 ］.In order to remove High-frequency Interference, the filter capacitor of the most handy low capacity is in parallel with sampling resistor ［ 1 ］.The anode current of magnetron ［ 4 ］ sampling resistor ［ 1 ］ of flowing through, become voltage signal after, be fed to A/D converter ［ 6 ］, the available ADC0809 of A/D converter ［ 6 ］, single-chip microcomputer ［ 5 ］ available 8031.A/D converter ［ 6 ］ converts analog quantity to digital quantity, send into single-chip microcomputer ［ 5 ］ afterwards, ask for the anode current meansigma methods, compare with predefined output, then calculate internal solid relay each second ［ 3 ］ and answer the cycle of conducting, according to calculating the output controlled quentity controlled variable, ac solid relay ［ 3 ］ is controlled.The available S204Z of ac solid relay ［ 3 ］.Alternating current zero crossing bolt slowdown monitoring circuit ［ 7 ］ one termination alternating current power supplys, the other end connects single-chip microcomputer ［ 5 ］, makes single-chip microcomputer ［ 5 ］ synchronous to the control and the alternating current of solid-state relay, controls the constant purpose of output fast and accurately thereby reach.

Because this utility model has adopted sampling resistor ［ 1 ］, thereby can collect the instantaneous anode current signal of magnetron ［ 4 ］ with single-chip microcomputer in time, thereby when mains fluctuations, can accurately control power in 1 second.Other output control device because time lag is longer, is unsuitable for the power control of microwave operation instrument.

The utility model compared with prior art has following good effect:

1, device of the present utility model has been eliminated the impact that the fluctuation of supply voltage produces power output.

2, the response time of the utility model device is fast.

Claims

1, the output control device used of a kind of microwave operation instrument, comprise magnetron, high-tension transformer and bridge rectifier, it is characterized in that, sampling resistor [1] connects anode circuit, A/D converter [6] and the bridge rectifier of magnetron [4] respectively, single-chip microcomputer [5] connects ac solid relay [3], A/D converter [6] and ac zero-crossing detection circuit [7] respectively, and ac zero-crossing detection circuit [7] connects alternating current power supply.

2, control device according to claim 1 is characterized in that, described sampling resistor (a 1) low capacity filter capacitor in parallel.