CN-122002659-A - Microwave driving control device

CN122002659ACN 122002659 ACN122002659 ACN 122002659ACN-122002659-A

Abstract

The invention provides a microwave driving control device which comprises a power supply converter, a first full-bridge inverter circuit, a first voltage transformation circuit, a voltage doubling circuit, a magnetron, a filament preheating circuit and a filament preheating circuit, wherein the first full-bridge inverter circuit is connected with the power supply converter in a conducting mode, the first voltage doubling circuit is connected with the first voltage transformation circuit in a conducting mode, the magnetron is connected with the voltage doubling circuit in a conducting mode, the filament preheating circuit is connected with the power supply converter in a conducting mode, and before high voltage is sent to the magnetron, the filament is preheated by the filament preheating circuit, and is heated to a thermal electron emission temperature and then triggered. The filament preheating circuit can preheat the filament and then drive the filament at high voltage, thereby prolonging the service life of the filament. In addition, the service life of the filament is predicted by detecting the resistance value of the filament and by the curve of the resistance value and the service life of the filament.

Inventors

WANG YINGBIN
LIU KEFU
YANG JUNXIAN
ZHOU MINGQING
WANG YONGSHENG

Assignees

财团法人精密机械研究发展中心

Dates

Publication Date: 20260508
Application Date: 20241107

Claims (10)

1. A microwave drive control device comprising: A power converter; the first full-bridge inverter circuit is connected with the power converter in a conducting way; The first transformation circuit is connected with the first full-bridge inverter circuit in a conducting way; The voltage doubling circuit is connected with the first voltage transformation circuit in a guide way; a magnetron, which is connected with the voltage doubling circuit in a guiding way and is provided with a filament; The filament preheating circuit is connected with the power supply converter in a guiding way, and is used for preheating the filament before sending high voltage to the magnetron, and the filament is triggered after being heated to the thermionic emission temperature.
2. The microwave driving control device according to claim 1, which is introduced into an intelligent monitoring system, and can obtain real-time resistance value information of the filament through calculation according to voltage and current data of the filament preheating circuit.
3. The microwave driving control device according to claim 2, which defines a normal period, a decay period and a replacement period of the filament according to the decay of the resistance value of the filament.
4. The microwave driving control device according to claim 3, wherein the filament preheating circuit determines that the resistance value of the filament is higher than the original 1.1-1.3 times range as the decay period, and wherein the filament preheating circuit determines that the resistance value of the filament is higher than the original 1.3-2 times range as the replacement period.
5. The microwave-driven control device according to claim 1, wherein the first voltage transformation circuit has two voltage transformation transformers, the primary sides of which are connected in series and the secondary sides of which are connected in parallel, or the primary sides of which are connected in parallel and the secondary sides of which are connected in series.
6. The microwave driving control device according to claim 1, wherein the voltage doubling circuit is connected in series with a capacitor according to the voltage of the magnetron, and the voltage doubling circuit is configured to increase the voltage multiple by using a modularized structure.
7. The microwave driving control device according to claim 1, further comprising a second full-bridge inverter circuit and a second voltage-transforming circuit, wherein the second full-bridge inverter circuit is connected to the power converter, the second voltage-transforming circuit is connected to the second full-bridge inverter circuit, and the voltage-multiplying circuit is connected to the second voltage-transforming circuit.
8. The microwave-driven control device according to claim 7, wherein the first full-bridge inverter circuit and the second full-bridge inverter circuit use separate voltage or current feedback mechanisms to adjust the input frequency, PWM signal or phase-shift signal to control the output voltage so as to achieve voltage equalization.
9. The microwave driving control device according to claim 7, wherein the phase sequence of the control signals of the first full-bridge inverter circuit and the second full-bridge inverter circuit is changed by 180 degrees to cancel each other out the half-cycle signals of the wave crest and the wave trough, thereby reducing the high-voltage ripple.
10. The microwave-driven control device according to claim 7, wherein the second voltage transformation circuit has two voltage transformation transformers, the primary sides of the two voltage transformation transformers are connected in series and the secondary sides of the two voltage transformation transformers are connected in parallel, or the primary sides of the two voltage transformation transformers are connected in parallel and the secondary sides of the two voltage transformation transformers are connected in series.

Description

Microwave driving control device Technical Field The invention relates to a microwave drive control technology, in particular to a microwave drive control device capable of preheating filaments. Background The known microwave driving control device has no filament preheating function to the magnetron, and the filaments are directly triggered and started by high voltage and high current, so that the filaments are easy to damage. In addition, the known microwave driving control device is difficult to monitor the service life of the filament due to different process use environments in industry, and the filament needs to be shut down for maintenance when damaged, so that loss is caused, the maintenance service and ordering waiting time is about 1-3 weeks, and the production line stop time is long. For example, in the patent of the method for monitoring the residual life of the TWI259906 capacitor, the driving module adopts direct boosting, the electric energy conversion efficiency is 50-60% lower, the high-temperature influence is easy to cause faults, the service life of the filament is about 2000-5000 hours because of different processes, and the replacement time cannot be mastered. Moreover, the known microwave drive control device has the advantages that the module depends on import, the import cost is high, the cost is about 50-60 ten thousand (6 kW), the maintenance is relatively difficult, the drive module adopts direct boosting, the circuit is easy to consume after long-term use, only full power output can be realized, the electric energy consumption is high, the electric energy conversion efficiency is low, the ripple is large, and fine power control is not easy to carry out. Disclosure of Invention In view of the above, an object of the present invention is to provide a microwave drive control device capable of preheating a filament by a filament preheating circuit and driving the filament at a high voltage, which can prolong the life of the filament. Another object of the present invention is to provide a microwave driving control device, by detecting the resistance value of the filament and predicting the life of the filament through the curve of the resistance value and the life of the filament, a user can predict the life of the filament through the device and make advance stock preparation to prevent the productivity from being affected. It is still another object of the present invention to provide a microwave driving control device, which makes the high voltage output ripple smaller, so as to facilitate the improvement of the stability of the subsequent microwave power control. The invention provides a microwave driving control device which comprises a power converter, a first full-bridge inverter circuit, a first voltage-doubling circuit, a magnetron, a filament preheating circuit and a filament preheating circuit, wherein the first full-bridge inverter circuit is connected with the power converter in a conducting mode, the first voltage-doubling circuit is connected with the first voltage-doubling circuit in a conducting mode, the magnetron is provided with a filament, the filament preheating circuit is connected with the power converter in a conducting mode, and the filament preheating circuit is used for preheating the filament before high voltage is sent to the magnetron and is triggered after the filament is heated to a thermal electron emission temperature. The filament can be preheated by the filament preheating circuit and then driven by high voltage, so that the service life of the filament can be prolonged, and the purpose of the invention is achieved. Preferably, the intelligent monitoring system is led in, and the real-time resistance value information of the filament can be obtained through calculation according to the voltage and current data of the filament preheating circuit. By detecting the resistance value of the filament and predicting the life of the filament through the curve of the resistance value and the life of the filament, a user can predict the life of the filament through the device and can prepare materials in advance so as to prevent the productivity from being influenced, thereby achieving another purpose of the invention. Preferably, the normal period, the decay period and the replacement period of the filament are defined according to the decay of the resistance of the filament. Preferably, the filament preheating circuit determines that the resistance value of the filament is higher than the original 1.1-1.3 times range as the decay period, and the filament preheating circuit determines that the resistance value of the filament is higher than the original 1.3-2 times range as the replacement period. Preferably, the first voltage transformation circuit has two voltage transformers, the primary sides of the two voltage transformers are connected in series and the secondary sides of the two voltage transformers are connected in parallel, or the primary sides o