Bridgeless bi-directional forward type converter
a forward type, bridgeless technology, applied in the direction of electric variable regulation, process and machine control, instruments, etc., can solve the problems of high component count, low efficiency, and high cost of other systems using multi-stage approaches, and achieve higher efficiency and high efficiency in the ac-dc converter. , the effect of improving efficiency
Active Publication Date: 2007-01-11
INFINEON TECH AMERICAS CORP
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- Application Information
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Benefits of technology
[0006] It is another object of the present invention to enable higher efficiency in the AC-DC converter by eliminating the input bridge and providing a single stage AC-DC function.
[0007] It is a further object of the present invention to enable implementation of power factor correction techniques, provide higher efficiency, circuit simplification, fewer circuit components, and hence lower circuit cost.
Problems solved by technology
The main reason for using the front-end rectifier bridge, which is a significant source of power losses, is that commonly available power switches are unidirectional, i.e., can block only unipolar voltage.
Similar disadvantages, including lower efficiency, high component counts, overall system complexity, and higher cost may be found in other systems using the multistage approach, e.g., circuitry using input bridge, PFC and isolated DC-DC and those using bridgeless PFC and isolated DC-DC.
Method used
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Embodiment Construction
[0019] The present invention makes use of normally ON bi-directional switches in AC-DC power converters. These switches are capable of conducting and blocking current in both directions. As shown in FIG. 1, a typical implementation 10 of the bi-directional switches uses two control pins or gates G1 and G2 to control the status of the device.
[0020] Since the device is a normally ON or depletion mode device, to keep the device 10 in an OFF state, a negative bias must be applied between the gate and the source. If one of the gates G1 or G2 is negatively biased, the device 10 is OFF and will block current passage from one source S1 of the device to source S2. If each gate is tied to its source or positive with respect to its source, then the device is ON.
[0021]FIG. 2 shows a circuit 20, incorporating the device 10 (FIG. 1). The circuit 20 illustrates the basic principle of the present invention, namely the use of a reactive element as series impedance for driving a normally ON depleti...
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A circuit is provided for converting power from an AC power source to DC power. The circuit including bi-directional switches capable of conducting and blocking a current flow in both directions. One or more control switches are coupled to a bi-directional switch to enable and disable the current flow through the bi-directional switch, the control switches are controlled by a signal voltage to turn a bi-directional switch ON by discharging a threshold voltage on one of the bi-directional switch gates and turning a bi-directional switch OFF when the threshold voltage is not discharged by the control switches. Additionally, the circuit includes a transformer having one or more primary windings and a secondary winding, each primary winding being coupled to one of the bi-directional switch sources. The current flow through the primary winding is disabled when the current flow through the corresponding bi-directional switch source is disabled.
Description
CROSS-REFERENCE TO RELATED APPLICATION [0001] This application is based on and claims the benefit of U.S. Provisional Application Ser. No. 60 / 698,037, filed on Jul. 11, 2005, entitled BRIDGELESS BIDIRECTIONAL FORWARD TYPE CONVERTERS, to which a claim of priority is hereby made and the disclosure of which is incorporated by reference.BACKGROUND OF THE INVENTION [0002] The present invention relates to AC-DC power conversion and more particularly to the use of bi-directional devices and elimination of losses due to unidirectional devices used in conventional front-end rectifier bridges. [0003] A standard off-line AC-DC power conversion stage is usually constituted by an input or front-end rectifier bridge followed by an isolated switch mode DC-DC conversion stage. This DC-DC stage is actually a DC-AC-DC stage, in which the high frequency AC provides isolation by means of a high frequency transformer. The main reason for using the front-end rectifier bridge, which is a significant sourc...
Claims
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Login to View More IPC IPC(8): H02M3/335
CPCH02M7/217Y02B70/1491H02M2001/0048Y02B70/10H02M1/0048
Inventor SOLDANO, MARCOSALATO, MAURIZIO
Owner INFINEON TECH AMERICAS CORP