A driving power and control method for magnetic control tube

Abstract

The invention discloses a solenoid drive power supply and its control method. The power supply includes a power supply terminal, a high voltage circuit connected with the power supply terminal, a first logic control circuit for performing control drive on the high voltage circuit, a filament circuit with an input end connected with the power supply terminal, and a second logic control circuit for performing control drive on the filament circuit. The method includes: for high voltage power part, adopting frequency conversion control, regulating inputting power by regulating on-off frequency, and ensuring output power be stable via voltage feedback when input voltage changes; and for the filament circuit, adopting semibridge circuit or single transistor circuit in which on time of one switch transistor of the semibridge circuit is stable and on time of the other switch transistor changes along with the feed, and off time of the switch transistor of the single transistor circuit is determined by a main circuit and on time is controlled by the feed. By adopting a technology of separating the filament circuit and the high voltage circuit, the invention has high adaptability on solenoid.

Description

technical field [0001] The invention relates to power conversion technology, in particular to a high-frequency switching power supply for powering a magnetron and a control method thereof. Background technique [0002] The invention relates to a magnetron driving power supply. The traditional magnetron driving power supply is driven by a power frequency transformer, and its power cannot be controlled, and a large amount of resources are wasted at the same time. The control of microwave power by switching power supply can only be controlled by time on-off to realize power regulation. For many years, there have been many schemes for using high-frequency switching power supply to supply power to magnetron, such as the patent No. figure 1 As shown, the patented power supply adopts the integration scheme of the filament circuit and the high-voltage circuit, that is, during the high-voltage power supply process of the magnetron, the filament power supply and the high-voltage powe...

AI Technical Summary

Problems solved by technology

Although this method can realize power regulation, there are the following problems: 1. The stresses of the two switch tubes are different, and 2. The stresses of the diodes at the output end are different, especially when the filament circuit is in poor contact, the high-voltage circuit is in poor contact or is open. The danger of pressure breakdown; 3. The power adjustment range is limited (in practice, it is adjusted in the range of 50% to 100%)

4. The biggest problem, because the high-voltage circuit and the filament circuit are integrated, the power supply requires a small inductance of the magnetron filament circuit to ensure that the change of the filament current is within the allowable range during frequency conversion control, making Panasonic's frequency conversion The power supply can only use Panasonic's high-frequency magnetron (or a magnetron specially optimized for the filament circuit), which hinders the application of switching power supplies and hinders the development of the market

Images