Zero voltage switching controller of resonance mode converter and electronic ballast using the same
First Claim
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1. A resonance mode power supply comprising:
- a resonance mode converter that inputs a DC voltage generated by rectifying an alternating current power and performs a zero voltage switching using a predetermined frequency and according to a drive signal, so as to provide a load with electricity; and
a zero voltage switching controller including;
a feedback controller that receives a first feedback signal from said resonance mode converter and compares it with a first reference voltage, said feedback controller providing a control current based on the comparison result,a main controller that receives said control current from said feedback controller, generates a triangle wave having a frequency based on said control current, and compares said triangle wave with a second reference voltage so as to output said drive signal to said resonance mode converter based on the comparison result, anda no-load sensor that receives a third feedback signal from said resonance mode converter and compares it with a third reference voltage having a hysteresis characteristic, said no-load sensor accordingly sensing a no-load state and causing said main controller to shut down said drive signal when there is no load.
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Abstract
A controller for performing a zero voltage switching using a resonance mode converter, and an electronic ballast adopting the same, includes a power controller, a shutdown protection circuit and a brownout circuit, and performs a switching when voltage of a switching element is zero, thereby preventing excessive power consumption, enhancing efficiency and decreasing noise.
37 Citations
5 Claims
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1. A resonance mode power supply comprising:
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a resonance mode converter that inputs a DC voltage generated by rectifying an alternating current power and performs a zero voltage switching using a predetermined frequency and according to a drive signal, so as to provide a load with electricity; and a zero voltage switching controller including; a feedback controller that receives a first feedback signal from said resonance mode converter and compares it with a first reference voltage, said feedback controller providing a control current based on the comparison result, a main controller that receives said control current from said feedback controller, generates a triangle wave having a frequency based on said control current, and compares said triangle wave with a second reference voltage so as to output said drive signal to said resonance mode converter based on the comparison result, and a no-load sensor that receives a third feedback signal from said resonance mode converter and compares it with a third reference voltage having a hysteresis characteristic, said no-load sensor accordingly sensing a no-load state and causing said main controller to shut down said drive signal when there is no load. - View Dependent Claims (2, 3, 4, 5)
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Specification