Galanz WP700AP20 - Typical Circuit Analyasis of Microwave Oven

current-res i stant
constructure
8). It is the most liable place where microwave leakage occurs. Especially, after a long time using, the microwave
leakage would enlarge at the hinge and the hook. Anyway, mechanic damage would also cause large amount of
microwave leakage. Therefore, the main methods designed for preventing microwave leakage of the door arę as
follows:
1) Assemble a layer of steel filament or a thin metal piąte with many holes at the middle of the window to madę it
is possible to observe the heating as well as shielding the microwave.
2) The widely used seal measurement at present
is to assemble a current - resistant construct
between the door and the doorframe. FIG.2-9 is
the typical construction fig of the door. It was
designed according to the theory of
"THETRANSFERING LINĘ ONE-FOURTHWAYE
LENGTH IMPEDANCE CHANGER". Although
there is no connecting point from a mechanical
point. It is sealed at the seam from the point of
electricity, so it is called "CURRENT-RESISTANT".
Recently, with the installation of noise filter in the
current resistant trough, the effect to restrain the
microwave leakage (include high subharmonic) - Pi
g
2-9
have been much improved.
front door piąte
noise filter
oven door
3 TYPICAL CIRCUIT ANALYASIS OF MICROWAYE OVEN
We have introduced the structure and the working principle of the microwave oven previously. We shall analyze
the complete set circuit of the microwave oven link with the practical circuit at this chapter.
SCHEMATIC DIAGRA
Unii \s not operated
Fig. 4-1
Fig.3-1 is the practical circuit diagram of a brand microwave oven. Its corresponding working conditions arę as
follows: The door closed, SW1 and SW2 turned on, SW3 closed, power control relay has no power, R1, R2 is cut
8