When the fan drive system adopts the single-supply power supply control mode, the power level of the switching power supply output will increase, the performance characteristics of the components will be improved, and the selection of the high-frequency transformer needs to be reconsidered. Therefore, there are many factors that need to be considered when adopting this control method.
Since the dual fan is used as the load (the original load is a single fan), the load demand is increased, and the output number of the high-frequency transformer needs to be increased. To meet the needs of the single-power dual-fan control work, the high-frequency transformer needs to increase the number of output channels; If the increase leads to an increase in current, the wire diameter of the primary winding of the high-frequency transformer needs to be increased accordingly, and the high-frequency transformer needs to be redesigned.
The more common switching power supply chip is TNY278. Due to the use of dual fans as the load, the parameters of the key components of the switching power supply need to be adjusted. Due to the increase in load, the number of output channels of the high-frequency transformer needs to be increased. At the same time, the leakage inductance will increase accordingly, and the spike voltage Vspike caused by the primary leakage inductance of the transformer will also increase accordingly.
The Vspike caused by the leakage inductance of the transformer can be absorbed by the peripheral circuit, so that the waveform peak of Vds does not exceed the withstand voltage of the switch tube under the condition of maximum AC input voltage and maximum load, but the basic premise is that the power chip should be selected higher. Pressure rating.
After the switch is turned on, the drain-source voltage will drop to zero instantaneously. At this time, the drain current starts to rise. When the duty ratio reaches the maximum and the current also reaches the maximum value, the switch is turned off and the current instantaneously drops to zero. . The first peak current is the noise of the switching tube action and will not affect normal use.
BLPS laser safety protective device is designed for personal safety used on hydraulic bender.
The dynamic test technology it used has passed the Type 4 functional safety assessment by TUV, and get the national invention patent. The product reaches the advanced technological level of similar products.
BLPS laser safety device provides protection zone near the die tip of the bender to protect fingers and arms of the operator in close to the upper mold die tip. It is the most effective solution so far to preserves the safety and productivity of the bender.
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