JPH067597Y2 - Induction heating cooker - Google Patents

Description

TECHNICAL FIELD The present invention relates to an induction heating cooker.

2. Description of the Related Art A conventional induction heating cooker of this kind is shown in FIG.
Fix the resin chassis 2 on the external housing 1 with screws 8,
On the chassis 2, the inverter parts of the induction heating cooker (power supply rectifier 3, resonance capacitor 4, transistor 5 which is a switching element for inverter oscillation, or connectors 6a, 6b for connecting each part) are soldered and mounted. Printed circuit board 7 and choke coil 1 placed
0, and a heating coil mounting plate 11 is further provided on the printed circuit board 7.

Problems to be Solved by the Invention In the inverter parts of the induction heating cooker, the switching element 5 for controlling the heating coil current is applied with a high voltage and a large current, causing a failure of the control circuit part or the switching element 5 described above. The probability of destruction due to its own failure is considerably higher than other parts. When the switching element 5 is destroyed, it normally goes into a short-circuit mode, and the power supply is short-circuited. It is often destroyed secondarily.

Therefore, in the conventional configuration as described above, when the power supply rectifier 3, the transistor 5 which is a switching element, or the drive element thereof fails due to some defect, in order to replace and repair the heating coil base 11, This is impossible unless the screws 9 and the connectors 6a and 6b are removed, and there is a problem that repairing the defect is extremely troublesome.

The present invention solves such a problem, and an object thereof is to facilitate replacement of a rectifier or a switching element on a printed circuit board without removing other components when the rectifier or the switching element fails.

Means for Solving the Problems An induction heating cooker according to the present invention comprises a semiconductor switching element, a rectifier, an inverter circuit component including a drive circuit for the semiconductor switching element, the rectifier, a drive circuit component or a semiconductor switching element. And a chassis for mounting and fixing the printed circuit board, wherein the chassis is provided with a through hole in the vicinity of the rectifier, the drive circuit component or the semiconductor switching device. It is a thing.

Function The induction heating cooker of the present invention has a through hole in a part of a chassis for fixing the printed circuit board in the vicinity of the rectifier or the drive circuit component or the semiconductor switching element fixed to the printed circuit board. Without removing the fixing screw and the connector connected to the printed circuit board, remove the chassis only from the main body and remove the solder on the part soldered from the back side to remove the rectifier or drive circuit parts. However, it can be exchanged.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, the parts numbered 1 to 11 are the same as the parts numbered in FIG. 3, and a description thereof will be omitted. The difference is that the through holes 12a and 12b are provided in a part of the chassis 2, that is, in the vicinity of the rectifier 3 and the drive transistor 5 which is a switching element. FIG. 2 is a bottom plan view of the chassis 2, in which 12a and 12b are through holes. 3a is a soldered portion of the lead wire of the rectifier 3 on the printed circuit board,
Reference numeral 5a is a soldered portion of the lead wire portion of the semiconductor switching element or the drive transistor 5.

In the above configuration, since the through hole is provided in the chassis 2 in the vicinity of the rectifier 3 or the semiconductor switching element or the drive transistor 5, when these parts fail, the mounting screw 8 of the chassis 2 is simply removed. The soldered part 3 shown in FIG.
The solders a and 5a can be removed, and they can be easily replaced.

In this embodiment, the air from the air-cooling fan 13 shown in FIG. 1 causes air to pass between the printed board 7 and the main body 1 and through the through holes 12a and 12b to form the rectifier 3 or the semiconductor switching element or the drive transistor. Since it hits the mounting portion of 5, the cooling effect of these heat generating components can be enhanced.

Effects of the Invention As is clear from the above description of the embodiment, the present invention has the following effects.

Since a through hole is provided in the chassis that fixes the printed circuit board near the rectifier or drive circuit or semiconductor switching device that is placed on the printed circuit board and electrically connected, repair of the rectifier or drive circuit component or semiconductor switching device Since the replacement can be facilitated and the cooling air can be applied to the component through the through hole, the cooling effect can be enhanced.

[Brief description of drawings]

FIG. 1 is a side sectional view of an induction heating cooker showing an embodiment of the present invention, FIG. 2 is a plan view of the same chassis, and FIG. 3 is a side sectional view of an induction heating cooker showing a conventional example. 2 ... Chassis, 3 ... Rectifier, 5 ... Drive transistor, 7 ... Printed circuit board, 12a, 12b ... Through hole.

Claims (1)

[Scope of utility model registration request] 1. A semiconductor switching device, a rectifier, an inverter circuit component including a drive circuit for the semiconductor switching device, a printed circuit board on which the rectifier, the drive circuit component or the semiconductor switching device is mounted and electrically connected. A chassis for mounting and fixing the printed circuit board, wherein the chassis is provided with a through hole in the vicinity of the rectifier, the drive circuit component, or the semiconductor switching element.