Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
174 words
A power converting apparatus (100) comprising: means (1) for supplying DC (direct current) power; DC-to-AC inverting means (2) for inverting the DC power into AC (alternating current) power; transformer means (3) for transforming the AC power so as to obtain desirable AC power; means (5) for detecting an output signal derived from the DC/AC inverting means (2) to produce an output detection signal (i D ); calculating means (6) for performing a control calculation for the DC/AC inverting means (2) so as to enable the output detection signal (i D ) to be followed to a reference signal (i R ), thereby deriving a first output instruction signal (V I ); and, DC component removing means (50) for removing a DC component from the first output instruction signal (V I ) to derive a second output instruction signal (V I-DC ), whereby the inverting operation of the DC/AC inverting means (2) is controlled based upon the second output instruction signal (V I-DC ) so as to prevent DC magnetization of the transformer means (3).
Claim 2
Dependent Claim
174 words
A power converting apparatus (100) comprising: means (1) for supplying DC (direct current) power; DC-to-AC inverting means (2) for inverting the DC power into AC (alternating current) power; transformer means (3) for transforming the AC power so as to obtain desirable AC power; means (5) for detecting an output signal derived from the DC/AC inverting means (2) to produce an output detection signal (i D ); calculating means (6) for performing a control calculation for the DC/AC inverting means (2) so as to enable the output detection signal (i D ) to be followed to a reference signal (i R ), thereby deriving a first output instruction signal (V I ); and, DC component removing means (50) for removing a DC component from the first output instruction signal (V I ) to derive a second output instruction signal (V I-DC ), whereby the inverting operation of the DC/AC inverting means (2) is controlled based upon the second output instruction signal (V I-DC ) so as to prevent DC magnetization of the transformer means (3).
Claim 3
Dependent Claim
53 words
A power converting apparatus (100) as claimed in Claim 1, further comprising: means (7) for converting the second output instruction signal (V I-DC ) output from the DC component removing means (50) into a pulsatory gate signal (S g ) so as to control the inverting operation of the DC/AC inverting means (2).
Claim 4
Dependent Claim
90 words
A power converting apparatus (100) as claimed in Claim 1, wherein said DC component removing means (50) includes: a low-pass filter (50A) for filtering said first output instruction signal (V I ) to obtain the DC component contained therein; an inverter (50B) for inverting the DC component derived from the low-pass filter (50A) to output an inverted DC component; and, an adder (50C) for adding the inverted DC component to said first output instruction signal (V I ) so as to obtain the second output instruction signal (V I-DC ).
Claim 5
Dependent Claim
39 words
A power converting apparatus (100) as claimed in Claim 3, wherein a cutoff frequency of said low-pass filter (50A) is selected to be considerably lower than a frequency of said AC power derived from the DC/AC inverting apparatus (2).
Claim 6
Dependent Claim
36 words
A power converting apparatus (100) as claimed in Claim 4, wherein said cutoff frequency of the low-pass filter (50A) is approximately 2 Hz, whereas said frequency of the AC power is from 50 to 60 Hz.
Claim 7
Dependent Claim
25 words
A power converting apparatus (100) as claimed in Claim 1, wherein said DC component removing means (50) includes an integrator circuit and a subtracting circuit.
Claim 8
Dependent Claim
19 words
A power converting apparatus (100) as claimed in Claim 1, wherein said detecting means (5) is a current transformer.
Claim 9
Dependent Claim
19 words
A power converting apparatus (100) as claimed in Claim 1, wherein said detecting means (5) is a potential transformer.