| 摘要 |
PURPOSE:To provide a compact and low cost cooling system by connecting a rectifier diode in series to a low voltage oven lamp to use it as a power source for a DC motor so that a power resistor may be eliminated. CONSTITUTION:AC inputs 9a, 9b of a rectifier diode 9 for DC motor are connected to an over lamp in series, and its outputs 9c, 9d are connected to a DC motor 10. Because the current flowing to the DC motor 10 is determined by the relationship between the equivalent resistance of the oven lamp and that of the DC motor, the equivalent resistance (length and diameter of filament) of the oven lamp 7 is adjusted to cause a required level of current to flow to the DC motor 10. The brightness of the oven lamp 7 is determined by the kind and pressure of sealed gas. By adopting a DC motor, the motor can be miniaturized, contributing to make the product compact.
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