AC to DC converting apparatus

Details AC to DC converting apparatus AC to DC converting apparatus

2001-10-01

2002-07-02

Tso, Edward H. (Department: 2838)

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

C363S080000

Reexamination Certificate

active

06414865

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates in general to DC converting apparatuses, and more particularly to an AC to DC converting apparatus not employing any multiplier for controlling a power factor.
2. Description of the Prior Art
FIG. 1
is a block diagram showing a conventional AC(Alternating Current) to DC(Direct Current) converting apparatus.
Referring to
FIG. 1
, the conventional AC to DC converting apparatus has a rectifying unit
10
, a current sensing unit
30
, a first adder
71
, voltage controller
20
, a multiplier
72
, a second adder
73
, current controller
40
, PWM (Pulse Width Modulation) unit
50
, and a switching device
60
. The rectifying unit
10
rectifies an AC supply voltage. The current sensing unit
30
senses an output current from the rectifying unit
10
, and the first adder
71
adds an output voltage Vdc to a reference voltage for controlling an output voltage Vdc. The voltage controller
20
performs a voltage control operation according to an output signal from the first adder
71
. The multiplier
72
multiplies the output voltage from the voltage controller
20
by an output voltage from the rectifying unit
10
after adjusting the level of the voltage by a first level-adjusting unit
11
. The second adder
73
adds the output signal from the multiplier
72
to an output signal from the current sensing unit
30
after the level of the signal is adjusted by a second level-adjusting unit
31
. The current controller
40
performs a current control operation according to the output signal from the second adder
73
. The PWM unit
50
generates a PWM signal in response to the output signal from the current controller
40
. The switching device
60
switches the output voltage from the rectifying unit
10
to output the voltage Vdc. The multiplier
72
, the second adder
73
, the current controller
40
, and the PWM unit
60
are integrated into a power factor control IC
80
.
The AC to DC converting apparatus having the above construction takes an output voltage from the rectifying unit
10
as a rectified voltage for controlling a power factor. In order to obtain a phase of the rectified voltage, the AC to DC apparatus employs the multiplier
72
, such that the multiplier
72
multiplies the output signal from the voltage controller
20
by the output voltage from the rectifying unit
10
after adjusting the level of the output voltage. Then, the current controller
40
generates a current following signal for current control. The second adder
73
adds the current following signal to the sensed output current from the current sensing unit
30
after adjusting the level of the output current, and the added signal is applied to the current controller
40
.
Accordingly, the conventional AC to DC converting apparatus is problematic in that its manufacturing costs are increased due to an addition of a multiplier used for obtaining phase information for controlling a power factor. Further, the conventional apparatus controls an output current of a rectifying unit using a sine wave control method for power factor control, such that it has nonlinear characteristics, thus deteriorating its entire operating characteristics.
SUMMARY OF THE INVENTION
Therefore, the present invention has been made in view of the above problem, and it is an object of the present invention to provide an AC to DC converting apparatus, which does not employ any multiplier for controlling a power factor, and compensates for its non-linear components.
In accordance with one aspect of the present invention, the above and other objects can be accomplished by the provision of an AC to DC converting apparatus, comprising a


REFERENCES:
patent: 4688162 (1987-08-01), Mutoh et al.
patent: 5446647 (1995-08-01), Ikeda et al.
patent: 6115267 (2000-09-01), Herbert
patent: 6191565 (2001-02-01), Lee et al.

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