Electric power conversion systems – Current conversion – With condition responsive means to control the output...
Reexamination Certificate
2002-03-29
2004-08-17
Patel, Rajnikant B. (Department: 2838)
Electric power conversion systems
Current conversion
With condition responsive means to control the output...
C363S016000
Reexamination Certificate
active
06778417
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to an electric-power supplying device, and a control circuit and a controlling method therefor, and more particularly, to an electric-power supplying device comprising switching elements switched according to a switching pulse so as to perform a rectification, and rectifying elements connected in parallel with the switching elements so as to perform a rectification, and a control circuit and a method for controlling the electric-power supplying device.
2. Description of the Related Art
FIG. 1
is a block diagram of an information processing system
1
.
The information processing system
1
comprises an alternator
11
, an AC-DC converting unit
12
, main boards
13
-
1
to
13
-n, and a network
14
. The alternator
11
supplies an alternating current voltage (an alternating current) to the AC-DC converting unit
12
. The AC-DC converting unit
12
converts the alternating current voltage (the alternating current) into a direct current voltage (a direct current).
The direct current voltage (the direct current) is supplied from the AC-DC converting unit
12
to the main boards
13
-
1
to
13
-n. The main boards
13
-
1
to
13
-n are information processing devices interconnected and intercommunicated via the network
14
. Each of the main boards
13
-
1
to
13
-n comprises DC-DC converting units
21
-
1
to
21
-
3
, a CPU
22
, and a storage device
23
, and a communication apparatus
24
.
The DC-DC converting unit
21
-
1
generates a predetermined direct current voltage based on the direct current voltage (the direct current) supplied from the AC-DC converting unit
12
, and supplies the generated direct current voltage to the CPU
22
. The CPU
22
is driven by the direct current voltage supplied from the DC-DC converting unit
21
-
1
so as to process data. The DC-DC converting unit
21
-
2
generates a predetermined direct current voltage based on the direct current voltage (the direct current) supplied from the AC-DC converting unit
12
, and supplies the generated direct current voltage to the storage device
23
. The storage device
23
is driven by the direct current voltage supplied from the DC-DC converting unit
21
-
2
so as to store the data processed by the CPU
22
and data supplied from the storage device
23
. The DC-DC converting unit
21
-
3
generates a predetermined direct current voltage based on the direct current voltage (the direct current) supplied from the AC-DC converting unit
12
, and supplies the generated direct current voltage to the communication apparatus
24
. The communication apparatus
24
controls communications with the network
14
.
FIG. 2
is a block diagram of the DC-DC converting unit
21
-
1
.
The DC-DC converting unit
21
-
1
comprises DC-DC converting circuits
31
-
1
and
31
-
2
, and diodes D
1
and D
2
. The DC-DC converting circuit
31
-
1
converts the direct current voltage supplied from the AC-DC converting unit
12
into a predetermined voltage. The DC-DC converting circuit
31
-
1
detects an output current and the output voltage so as regulate the output voltage at a constant level. The output voltage is supplied from the DC-DC converting circuit
31
-
1
to the CPU
22
via the diode D
1
. The DC-DC converting circuit
31
-
2
is arranged in the same manner as the DC-DC converting circuit
31
-
1
such that the output voltage is supplied from the DC-DC converting circuit
31
-
2
to the CPU
22
via the diode D
2
.
In a normal operation, direct currents are supplied from the DC-DC converting circuit
31
-
1
and the DC-DC converting circuit
31
-
2
to the CPU
22
. Upon rising, when the output voltage of the DC-DC converting circuit
31
-
1
rises earlier than the output voltage of the DC-DC converting circuit
31
-
2
, the diode D
2
keeps the current from flowing from the DC-DC converting circuit
31
-
1
to the DC-DC converting circuit
31
-
2
. That is, the diode D
2
can prevent an adverse current to the DC-DC converting circuit
31
-
2
.
Upon rising, when the output voltage of the DC-DC converting circuit
31
-
2
rises earlier than the output voltage of the DC-DC converting circuit
31
-
1
, the diode D
1
keeps the current from flowing from the DC-DC converting circuit
31
-
2
to the DC-DC converting circuit
31
-
1
. That is, the diode D
1
can prevent an adverse current to the DC-DC converting circuit
31
-
1
.
Next, a more detailed description will be given of the DC-DC converting circuit
31
-
1
(the DC-DC converting circuit
31
-
2
).
FIG. 3
is a block diagram of the DC-DC converting circuit
31
-
1
.
The DC-DC converting circuit
31
-
1
comprises an inverter circuit
41
, a transformer
42
, switching elements (transistors) Q
1
and Q
2
, rectifying elements (diodes) D
11
and D
12
, a control circuit
43
, a choke coil L
0
, an output current detection resistance Rs, and a smoothing capacitor C
0
.
The direct current voltage is impressed from the AC-DC converting unit
12
to the inverter circuit
41
. The inverter circuit
41
converts the direct current voltage impressed from the AC-DC converting unit
12
into an alternating current voltage.
The alternating current voltage converted by the inverter circuit
41
is impressed to a primary coil L
1
of the transformer
42
. An alternating current in accordance with the alternating current voltage impressed from the inverter circuit
41
flows in the primary coil L
1
of the transformer
42
so that a magnetic flux is generated therein in accordance with the flowing current. The magnetic flux generated in the primary coil L
1
of the transformer
42
is transmitted to secondary coils L
21
and L
22
of the transformer
42
. A secondary current in accordance with the magnetic flux transmitted from the primary coil L
1
flows in the secondary coils L
21
and L
22
.
One end of the secondary coil L
21
is grounded via a source and a drain of the transistor Q
1
, and the other end of the secondary coil L
21
is connected to one end of the choke coil L
0
. One end of the secondary coil L
22
is grounded via a source and a drain of the transistor Q
2
, and the other end of the secondary coil L
22
is connected to the one end of the choke coil L
0
. The transistors Q
1
and Q
2
are MOS-FETs (Metal-Oxide-Semiconductor field effect transistors), for example.
The transistors Q
1
and Q
2
have gates connected to the control circuit
43
so as to be switched according to a switching pulse supplied from the control circuit
43
. The diode D
11
is connected between the source and the drain of the transistor Q
1
in parallel. An anode of the diode D
11
is grounded via the drain of the transistor Q
1
, and a cathode of the diode D
1
is connected to the secondary coil L
21
via the source of the transistor Q
1
.
The other end of the choke coil L
0
is connected to an output terminal Tout via the output current detection resistance Rs. The smoothing capacitor C
0
is connected between the output terminal Tout and a ground terminal Tgnd. An electric potential of a node of the secondary coil L
21
and the secondary coil L
22
is smoothed by the choke coil L
0
and the smoothing capacitor C
0
, and is output via the output terminal Tout.
Voltages at both ends of the output current detection resistance Rs and an output voltage Vout of the output terminal Tout are supplied to the control circuit
43
. When the output voltage Vout supplied from the output terminal Tout becomes small, the control circuit
43
reduces a pulse width, or increases cycles, of the switching pulse supplied to the gates of the transistors Q
1
and Q
2
. When the output voltage Vout supplied from the output terminal Tout becomes large, the control circuit
43
enlarges the pulse width, or decreases the cycles, of the switching pulse supplied to the gates of the transistors Q
1
and Q
2
.
Thus, the gates of the transistors Q
1
and Q
2
are supplied with the switching pulse from the control circuit
43
, and the transistors Q
1
and Q
2
are switched alternately according to the switching pulse sup
Fuchigami Kazutoshi
Itakura Kazuhiko
Ohno Tsunehiro
Shimamori Hiroshi
Arent & Fox PLLC
Fujitsu Limited
Patel Rajnikant B.
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