Hybrid Power Supply System
First Claim
1. A hybrid power supply system for driving a discharge lamp, the hybrid power supply system comprising:
- a rectifier/filter having an input terminal connected to an external AC voltage, the rectifier/filter converting the external AC voltage to a DC voltage;
a piezoelectric inverter connected to the rectifier/filter, the piezoelectric inverter stepping up and converting the DC voltage to an AC voltage for driving the discharge lamp; and
a ferrite converter connected to the rectifier/filter, the ferrite converter stepping down the DC voltage to a rated DC voltage for driving discharge lamp circuits other than the discharge lamp,the piezoelectric inverter including;
two first switching circuits having respective input terminals and a common output terminal;
a driver circuit electrically coupled to respective control input terminals of the first switching circuits, the driver circuit driving the first switching circuits;
at least one piezoelectric step-up transformer having a primary side electrically coupled to the common output terminal of the first switching circuits and a secondary side electrically coupled to the discharge lamp;
a sampling circuit electrically coupled to the discharge lamp, the sampling circuit detecting a current value of the discharge lamp and outputting a feedback signal;
a comparator circuit electrically coupled to the sampling circuit and a frequency control circuit, the comparator circuit comparing the feedback signal with a predetermined reference signal; and
the frequency control circuit electrically coupled to the comparator circuit and the driver circuit, the frequency control circuit controlling a switching frequency for the switching circuits according to an output signal of the comparator circuit,the ferrite converter including a ferrite step-down transformer and a rectifier circuit,the ferrite step-down transformer having a primary side electrically coupled to the output terminal of the switching circuits and a secondary side electrically coupled to the rectifier circuit,the rectifier circuit electrically coupled to the secondary side of the ferrite step-down transformer.
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Abstract
A hybrid power supply system including piezoelectric and ferrite transformers for driving a discharge lamp is provided. Specifically, the hybrid power supply system includes a rectifier/filter, a piezoelectric inverter, and a ferrite converter. The rectifier/filter has an input terminal connected to an external AC voltage to convert the external AC voltage to a DC voltage. The piezoelectric inverter is connected to the rectifier/filter to step up and convert the DC voltage to an AC voltage for driving the discharge lamp. The ferrite transformer is connected to the rectifier/filter to step down the DC voltage to a rated DC voltage for driving discharge lamp circuits other than the discharge lamp. The piezoelectric inverter and the ferrite converter are integrated by connecting a primary side of the piezoelectric step-up transformer and a primary side of the ferrite step-down transformer in series or in parallel with an output terminal of switching circuits.
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Citations
9 Claims
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1. A hybrid power supply system for driving a discharge lamp, the hybrid power supply system comprising:
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a rectifier/filter having an input terminal connected to an external AC voltage, the rectifier/filter converting the external AC voltage to a DC voltage; a piezoelectric inverter connected to the rectifier/filter, the piezoelectric inverter stepping up and converting the DC voltage to an AC voltage for driving the discharge lamp; and a ferrite converter connected to the rectifier/filter, the ferrite converter stepping down the DC voltage to a rated DC voltage for driving discharge lamp circuits other than the discharge lamp, the piezoelectric inverter including; two first switching circuits having respective input terminals and a common output terminal; a driver circuit electrically coupled to respective control input terminals of the first switching circuits, the driver circuit driving the first switching circuits; at least one piezoelectric step-up transformer having a primary side electrically coupled to the common output terminal of the first switching circuits and a secondary side electrically coupled to the discharge lamp; a sampling circuit electrically coupled to the discharge lamp, the sampling circuit detecting a current value of the discharge lamp and outputting a feedback signal; a comparator circuit electrically coupled to the sampling circuit and a frequency control circuit, the comparator circuit comparing the feedback signal with a predetermined reference signal; and the frequency control circuit electrically coupled to the comparator circuit and the driver circuit, the frequency control circuit controlling a switching frequency for the switching circuits according to an output signal of the comparator circuit, the ferrite converter including a ferrite step-down transformer and a rectifier circuit, the ferrite step-down transformer having a primary side electrically coupled to the output terminal of the switching circuits and a secondary side electrically coupled to the rectifier circuit, the rectifier circuit electrically coupled to the secondary side of the ferrite step-down transformer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification