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Application filed by Peng Soon SoongfiledCriticalPeng Soon Soong
Priority to MYPI91002403ApriorityCriticalpatent/MY107337A/en
Publication of MY107337ApublicationCriticalpatent/MY107337A/en
THE PRIMARY OBJECT OF THE PRESENT INVENTION IS TO PROVIDE A SWITCHING MODE ELECTRONIC BALLAST, IN WHICH A RESONANT CAPACITOR IS INSTALLED IN PARALLEL WITH THE PRIMARY WINDING OF THE MAIN OUTPUT TRANSFORMER, AND THUS A FORCED RESONANCE RESULTED AT THE PRIMARY CIRCUIT DURING THE SWITCH OFF TIME OF THE SWITCHING TRANSISTOR; AND A PHASE LOCK CIRCUIT IT ADDED IN SERIES WITH THE FEEDBACK CIRCUIT OF THE DC-AC INVERTER, WHICH FORCES THE SWITCHING TRANSISTOR TO WORK IN SYNCHRONIZATION WITH THE OPERATION OF THE LC RESONANT TANK AND TO HAVE A ZERO VOLTAGE CROSSING WHEN SWITCH ON: SO A MINIMUM SWITCHING LOSS AS WELL AS A MINIMUM HARMONIC AND ELECTROMAGNETIC INTERFERENCE CAN BE REACHED; ALSO IT CAN BE EXPANDED TO HAVE MORE EFFECTIVE OPTIONS ON INTERFACE FOR LOGICAL SWITCHES. DIMMERS AND PROTECTORS.@@(FIGURE 1)@