| 摘要 |
<p>In a cooling system used for cooling a heater housing box, there is provided an apparatus for stabilizing a power supply of a heater housing box cooling apparatus wherein at AC power-up, a plurality of taps formed in the windings of a power supply transformer are switched before an output voltage thereof goes beyond an allowable voltage range. For this purpose, a first resistor, which causes the output voltage of a power supply transformer to gently rise at AC power-up, is disposed on the secondary side of the power supply transformer. A DC voltage (V1), which is the output voltage having been rectified and smoothed, is delayed in rise by a charging time of a first capacitor, so that before the output voltage goes beyond the allowable voltage range, an electronic control apparatus is activated to operate a tap switching relay that automatically switches the plurality of taps formed in the power supply transformer.</p> |
