| 摘要 |
This supplier is able to provide constont power by controlling conduction cycle even though a nor minal voltage is changed to another voltage source, while voltage selector equipped supplier has power loss and heavy weight in old system. The equipment comprises voltage detecting circuit (1) to sense input voltage level and to produce different DC signals, timing-pulse generator (2) to give pulse every 4 cycle of input frequency, triggering circuit (3) at zero-crossing point of supply voltage using output signals of (1) and (2), and power conditioning circuit (4) equipped with triac (TRF) to control input power to heating equipment. This also increases temperature uniformity and decreases chances of fire.
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