AC-DC CONVERTER WITH UNITY POWER FACTOR
First Claim
1. A method for construction of voltage-mode or current-mode power sources receiving a rectified AC input, said power sources based on inclusion of a buffer stage feeding a converter-based output driver feeding a load, said buffer stage comprising:
- a buffer capacitance; and
a buffer charger having a control means,such that the consumed input current from said rectified AC input is proportional to the AC input voltage to said power source,wherein said buffer stage functions as a charge buffer, enabling maintainance of the consumed input current over the entire period of said AC input voltage, and acting to separate said output driver and load from the consumed input current.
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Abstract
A method for construction of voltage or current power sources receiving an AC input, the power sources based on inclusion of a buffer stage feeding a converter operating with an output driver to a load. The buffer stage includes a buffer capacitance and a control means, such that the consumed input current from the AC input is proportional to the AC input voltage to the power source. The buffer capacitance functions as a charge buffer, enabling maintenance of the consumed input current over the entire period of the AC input voltage, and acting to separate the load from the consumed input current.
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Citations
12 Claims
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1. A method for construction of voltage-mode or current-mode power sources receiving a rectified AC input, said power sources based on inclusion of a buffer stage feeding a converter-based output driver feeding a load, said buffer stage comprising:
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a buffer capacitance; and a buffer charger having a control means, such that the consumed input current from said rectified AC input is proportional to the AC input voltage to said power source, wherein said buffer stage functions as a charge buffer, enabling maintainance of the consumed input current over the entire period of said AC input voltage, and acting to separate said output driver and load from the consumed input current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A device for power conversion with a high power factor comprising:
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an input rectifier; a high frequency DC/DC converter feeding a buffer stage; a buffer stage comprising at least a buffer capacitance and a buffer charger having a control means configured to make the consumed current proportional to the rectified AC power line voltage; and an output current driver feeding the load, wherein said buffer stage has feedback from the output in order to achieve the required operation.
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11. A current source providing a high power factor and able to regulate the output current as a function of the dimmer state, when a dimmer connected to the input, said current source comprising:
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an input rectifier; a high frequency DC/DC converter feeding a buffer stage; a buffer stage comprising at least a buffer capacitance and a buffer charger having a control means configured to make the consumed current proportional to the rectified AC power line voltage; and an output current driver feeding the load, wherein said buffer stage has feedback from the output in order to achieve the required operation.
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12. A voltage source providing a high power factor, and able to regulate the output current as a function of the dimmer state when connected to the input, said voltage source comprising:
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an input rectifier; a high frequency DC/DC converter feeding a buffer stage; a buffer stage comprising at least a buffer capacitance and a buffer charger having a control means configured to make the consumed current proportional to the rectified AC power line voltage; and an output voltage driver feeding the load, wherein said buffer stage has feedback from the output in order to achieve the required operation.
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Specification