Abstract

The purpose of the present invention is to prevent displacement of the frequency of the output of an inverter unit from a resonant frequency even if performing output control, and to improve the characteristics of tracking a load of which the resonant frequency varies. An inverter device (10) is a PWM-controlled voltage-type inverter connected to a resonant load (200) and has: an inverter unit (106) connected to the resonant load (200) and driven by an inverter drive signal (Q, NQ); and a control means (12) for controlling the operation of the inverter unit (106). The control means (12), using a pulse signal having a pulse width shorter than the cycle of the resonant frequency of the resonant load (200) as the inverter drive signal (Q, NQ), starts driving of the inverter unit (106) at a frequency away from the resonant frequency as a starting point. Then, the control means (12) shifts the frequency of the inverter drive signal (Q, NQ) to the resonant frequency or a vicinity of the resonant frequency and performs control so that the frequency of the inverter drive signal (Q, NQ) substantially matches the resonant frequency.

IPC Classes  ?

• H02M 7/48 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
• H05B 6/06 - Control, e.g. of temperature, of power

Abstract

A waveguide circulator which does not cause an arcing phenomenon and deterioration of microwave characteristic, even when a ferrite member generates heat to raise a temperature thereof. The waveguide circulator is composed of a waveguide formed substantially in Y-shape with rectangular waveguides which are provided so as to position horizontally on a predetermined plane, and further they are extended in different three directions from junction positions of the waveguide wherein two ferrite members are placed in the junction positions thereof so as to oppose to each other on the upper and lower sides in the height direction perpendicular to the predetermined plane wherein an extended section extending in the height direction in the vicinities of the junction positions of the waveguides is formed, and a distance between the ferrite members is expanded to compensate decreased impedance.

IPC Classes  ?

• H01P 1/39 - Hollow waveguide circulators