CN2086032U

CN2086032U - Precision controller for microwave power

Info

Publication number: CN2086032U
Application number: CN 91200064
Authority: CN
Inventors: 张立儒; 汤桐奎
Original assignee: Tianjin University
Current assignee: Tianjin University
Priority date: 1991-01-07
Filing date: 1991-01-07
Publication date: 1991-10-02

Abstract

The utility model relates to a precision controller for microwave power, which comprises a microwave tube, a high voltage transformer, a bridge rectifier, a capacitance-resistance testing circuit, a detecting and controlling module, an AC solid-state relay, etc., wherein, the detecting and controlling module is composed of a monolithic computer, an A and D transposer joint, and an AC zero-crossing detector circuit. The device can be used for automatically controlling the output power value of microwave, and makes the output power keep constantly invariant.

Description

Precision controller for microwave power

The utility model relates to microwave therapy apparatus, and more particularly, the utility model is about the microwave power accurate control device.

Russian Patent discloses a kind of microwave output power control device for No. 940387.This device comprises microwave tube, high-tension transformer, bridge rectifier, resistor, relay, transistor etc., though this control device controlled microwave power output to a certain extent, low precision.Especially hour, because the pulse instability causes relay misoperation to do easily at the microwave tube anode current.In addition, relay has mechanical contact, poor reliability, and the life-span is short.

The purpose of this utility model is to overcome above-mentioned shortcoming of the prior art, a kind of accurately controlled microwave power output, reliable operation, long control device of life-span are provided, it can realize the automatic adjusting of microwave output power, when fluctuation took place supply voltage, it is invariable that power output can keep.

Device of the present utility model contains microwave tube, high-tension transformer, bridge rectifier, capacitance-resistance testing circuit (1), Detection ﹠ Controling module (2), ac solid relay (3).Described module (2) is made of single-chip microcomputer (5), A/D converter interface (6) and ac zero-crossing detection circuit (7).Capacitance-resistance testing circuit (1) is connected with the anode circuit of microwave tube (4), A/D converter and the bridge rectifier in the module (2) respectively.Single-chip microcomputer in the module (2) connects ac solid relay (3), and the ac zero-crossing detection circuit in the module (2) connects AC power.Above-mentioned single-chip microcomputer can adopt the MCS-51 single-chip microcomputer, also can select other microcomputer certainly for use.In addition, module (2) also can be made of single-chip microcomputer that has A/D converter and ac zero-crossing detection circuit.

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 is the structure chart of microwave power control device;

Fig. 2 is the structure chart of module (2);

Fig. 3 is the circuit diagram of capacitance-resistance testing circuit (1);

Fig. 4 is the circuit diagram of ac zero-crossing detection circuit.

In the drawings, capacitance-resistance testing circuit (1) is serially connected in the anode circuit of microwave tube (4).The anode current signal is reflecting the power output of microwave tube (4).Capacitance-resistance testing circuit (1) takes out signal from the anode current of microwave tube (4), then it is presented to the A/D converter in the module (2), A/D converter converts this analog quantity to digital quantity, send into single-chip microcomputer afterwards, compare with the power output of setting, then carry out proportional integral and regulate computing,, ac solid relay (3) is controlled according to calculating the output controlled quentity controlled variable.Ac zero-crossing detection circuit one termination AC power in the module (2), the other end is exported to single-chip microcomputer, makes single-chip microcomputer synchronous to the control and the alternating current of solid-state relay.Like this, can continuously change the supply power voltage value of high-tension transformer, thereby reach the constant purpose of accurate control power output.

The utility model compared with prior art has following advantages:

1. the utility model can accurately be controlled the microwave output power value automatically, has eliminated the impact that interference that the fluctuation of supply voltage and oscillating circuit introduce produces power output.

2. the utility model machinery-free contact, reliability height, long service life.

Claims

1, a kind of microwave power accurate control device, contain microwave tube, high-tension transformer and bridge rectifier, it is characterized in that, it also contains capacitance-resistance testing circuit [1], Detection ﹠ Controling module [2], ac solid relay [3], described module [2] is by single-chip microcomputer [5], A/D converter interface [6] and ac zero-crossing detection circuit [7] constitute, capacitance-resistance testing circuit [1] respectively with the anode circuit of microwave tube [4], A/D converter and bridge rectifier in the module [2] are connected, single-chip microcomputer in the module [2] connects ac solid relay [3], and the ac zero-crossing detection circuit in the module [2] connects AC power.

2, microwave power accurate control device as claimed in claim 1 is characterized in that described module (2) is made of single-chip microcomputer that has A/D converter and ac zero-crossing detection circuit.

3, microwave power accurate control device as claimed in claim 1 is characterized in that described single-chip microcomputer is the MCS-51 single-chip microcomputer.