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US 8,508,145 B2Granted
DC/AC inverter
AssigneeBeyond Innovation Technology Co., Ltd.
InventorsChung-Che Yu, Shih-Chung Huang, Chien-Pang Hung, Chih-Shun Lee
Life of this patent
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Abstract
A fluorescent lamp device includes a frequency generator for generating a pulse signal, a driver circuit coupled to said frequency generator for generating at least one driving signal according to said pulse signal, a half bridge power switch unit coupled to the driver circuit, a resonant tank coupled to the half bridge power switch unit, and a fluorescent lamp coupled to the resonant tank.
Claims12
A fluorescent lamp device comprising:
- a fluorescent lamp;
- a frequency generator for generating a pulse signal;
- a driver circuit coupled to said frequency generator for generating at least one driving signal according to said pulse signal;
- a half bridge power switch unit coupled to said driver circuit for generating an AC signal according to said at least one driving signal;
- a resonant tank electrically connected between said half bridge power switch unit and said fluorescent lamp for filtering said AC signal to supply power to said fluorescent lamp;
- a protection circuit electrically connected to said fluorescent lamp for stably adjusting voltage of said fluorescent lamp, said protection circuit comprising a comparator for comparing a signal indicating a terminal voltage of said fluorescent lamp with a reference voltage to generate a comparison signal to decrease said supply power when said signal exceeds said reference voltage;
- and
- a pulse width modulator electrically connected to said driver circuit for providing a pulse width modulation signal to said driver circuit according to said comparison signal, so as to generate said at least one driving signal, wherein said pulse width modulator comprises:
- an error amplifier;
- a resistor electrically connected to an inverting input of said error amplifier;
- a capacitor having one terminal electrically connected to said resistor and said inverting input of said error amplifier to form an integrator;
- a comparator having a non-inverting input electrically connected to an output of said error amplifier and the other terminal of said capacitor;
- a switch controlled at least by said comparison signal;
- and
- a controlled current source electrically connected to said inverting input of said error amplifier through said switch.
12 more elements
A direct current to alternating current (DC/AC) inverter for inverting a DC voltage source to an AC power source to drive a load, comprising:
- a frequency generator for generating a pulse signal;
- a driver circuit coupled to said frequency generator for generating at least one driving signal according to said pulse signal;
- a half bridge power switch unit coupled to said driver circuit for generating an AC signal according to said at least one driving signal;
- a resonant tank electrically connected between said half bridge power switch unit and said load for filtering said AC signal to supply power to said load;
- a protection circuit for electrically connecting to said load for stably adjusting voltage of said load, said protection circuit comprising a comparator for comparing a signal indicating a terminal voltage of said load with a reference voltage to generate a comparison signal to decrease said supply power when said signal exceeds said reference voltage;
- and
- a pulse width modulator electrically connected to said driver circuit for providing a pulse width modulation signal to said driver circuit according to said comparison signal, so as to generate said at least one driving signal, said pulse width modulator comprising:
- an error amplifier;
- a resistor electrically connected to an inverting input of said error amplifier;
- a capacitor having one terminal electrically connected to said resistor and said inverting input of said error amplifier to form an integrator;
- a comparator having a non-inverting input electrically connected to an output of said error amplifier and said other terminal of said capacitor;
- a switch controlled at least by said comparison signal;
- and
- a controlled current source electrically connected to said inverting input of said error amplifier through said switch.
11 more elements
Dependencies are inferred from the claim text.