Power factor correction circuitry
First Claim
1. A power factor correction circuit for use with a power supply having an input port for receiving an AC signal and a rectifier for producing a rectified AC signal and an output stage for outputting a DC output signal for driving a load coupled to the output stage, said power factor correction circuit comprising:
- (a) an input coupled to the rectifier for receiving the rectified AC signal;
(b) inductive means coupled to said input for storing energy in response to excitation by the rectified AC signal;
(c) controller means for controlling excitation of said inductive means;
(d) charge storage means coupled to said inductive means for charging by said inductive means under control of said controller means to produce the DC output signal; and
(e) blocking means which blocks a direct path for current flow from said input to the load.
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Accused Products
Abstract
A power factor correction circuit for use with a power supply. The power supply has an input for receiving an AC input signal, a rectifier for producing a rectified AC signal and an output stage for outputting a DC output signal for driving a load coupled to the output stage. The power factor correction circuit comprises an input port coupled to the rectifier for receiving the rectified AC signal; and an inductor coupled to the input port for storing energy in response to excitation by the rectified AC signal. The excitation of the inductor is controlled through the opening and closing of a switch by a controller. A capacitor is coupled to the inductor and charged by the energy stored in the inductor when the switch is opened to produce the DC output signal. The power factor correction circuit includes a diode for blocking the charge path between the input port and the capacitor and also allowing the controller to boost the charge level on the capacitor.
82 Citations
20 Claims
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1. A power factor correction circuit for use with a power supply having an input port for receiving an AC signal and a rectifier for producing a rectified AC signal and an output stage for outputting a DC output signal for driving a load coupled to the output stage, said power factor correction circuit comprising:
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(a) an input coupled to the rectifier for receiving the rectified AC signal; (b) inductive means coupled to said input for storing energy in response to excitation by the rectified AC signal; (c) controller means for controlling excitation of said inductive means; (d) charge storage means coupled to said inductive means for charging by said inductive means under control of said controller means to produce the DC output signal; and (e) blocking means which blocks a direct path for current flow from said input to the load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 17)
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12. A power factor correction circuit for use with a power supply having an input port for receiving an AC input signal and a rectifier for producing a rectified AC signal and an output stage for outputting a DC output signal for driving a load coupled to the output stage, said power factor correction circuit comprising:
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(a) an input coupled to the rectifier for receiving the rectified AC signal; (b) charge storage means having first and second terminals, the first terminal being connected to said input and said connection forming a first output terminal and said second terminal forming a second output terminal for connecting the load; (c) inductive means for storing energy in response to excitation by the rectified AC signal, said inductive means having first and second terminals, the first terminal of said inductive means being connected to said second output terminal; (d) means for isolating said inductive means from said input port, said means for isolating being connected to said input and to the second terminal of said inductive means; and (e) controller means coupled to the second terminal of said inductive means for controlling excitation of said inductive means by providing a controllable current path through the load for the rectified AC signal to excite said inductive means and the load providing means for damping the rectified AC signal fed to said inductive means. - View Dependent Claims (13, 14, 15, 16)
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18. A power factor correction circuit for use with a power supply having a supply input port for receiving an AC input signal and a rectifier for producing a rectified AC signal and an output stage for outputting a DC output signal for driving a load coupled to the output stage, said power factor correction circuit comprising:
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(a) an input coupled to the rectifier for receiving the rectified AC signal; (b) a booster stage coupled to said input and having a booster output port and means for producing a boosted signal from the rectified AC signal at said booster output port, said booster stage further having means which blocks a direct path for current flow from said input to said booster output; (c) a reducer stage coupled to said booster output port and having means for generating the DC output signal from said boosted signal; (d) controller means coupled to said booster stage and to said reducer stage for controlling operation of said booster and reducer stages; and (e) said controller means including power factor correction means.
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19. A power factor correction circuit for use with a power supply having an input port for receiving an AC signal and a rectifier for producing a rectified AC signal and an output stage for outputting a DC output signal for driving a load coupled to the output stage, said power factor correction circuit comprising:
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(a) an input having first and second terminals coupled to the rectifier for receiving the rectified AC signal; (b) inductive means for storing energy in response to excitation by the rectified AC signal, said inductive means being coupled through a first path to one of said terminals and through a second path to the other of said terminals; (c) controller means for controlling excitation of said inductive means, said controller means comprising a controller and a switch, and said switch having a control input coupled to said controller, said switch being operable in a conduction state and a non-conduction state; (d) said switch being coupled in one of said first and second paths between said inductive means and said input; (e) charge storage means coupled to said inductive means for charging by said inductive means under control of said controller means to produce the DC output signal; so that when said switch is operating in said non-conduction state, said one path is open. - View Dependent Claims (20)
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Specification