Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Transformer in the supply circuit
Reexamination Certificate
2002-05-15
2003-07-15
Wong, Don (Department: 2821)
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Transformer in the supply circuit
C315S246000, C315S144000, C315S271000, C315S312000, C315S324000, C315S2090SC
Reexamination Certificate
active
06593707
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a cross connection structure for dual high-pressure discharge lamp banks and transformers thereof. With the cross connection structure, high-pressure discharge lamps in the same lamp bank could be maintained at a voltage having the same phase with a small potential difference among them. The problem of mutually repulsion among the lamps in the same lamp bank is eliminated to ensure safe use of the lamps.
FIG. 1
shows a conventional manner for connecting dual high-pressure discharge lamp banks to transformers thereof. A first high-pressure discharge lamp bank LP
1
includes a plurality of high-pressure discharge lamps LP
11
, LP
12
; and a second high-pressure discharge lamp bank LP
2
also includes a plurality of high-pressure discharge lamps LP
21
, LP
22
. In the illustrated drawing, only two lamps are shown for each lamp bank. The high-pressure discharge lamps in the same lamp bank correspond to one transformer. A first transformer T
1
corresponded to the first lamp bank LP
1
is connected at two outputs at a secondary side thereof to two lamps of the first high-pressure discharge lamp bank. That is, the first transformer T
1
has a first output T
11
connected to a high-pressure discharge lamp LP
11
, and a second output T
12
connected to another high-pressure discharge lamp LP
12
. The lamps in the second high-pressure discharge lamp bank are also connected to one transformer in the same manner. That is, a second transformer T
2
is connected at two outputs at a secondary side thereof to two lamps of the second high-pressure discharge lamp bank LP
2
. More specifically, a first output T
21
of the second transformer T
2
is connected to a high-pressure discharge lamp LP
21
, and a second output T
22
of the second transformer T
2
is connected to another high-pressure discharge lamp LP
22
in the second lamp bank LP
2
. On the other hand, primary sides of the transformers T
1
and T
2
are connected to drive circuits
1
and
2
, respectively. And, the drive circuits
1
,
2
are connected via a signal line
3
to work synchronously.
The above-described connection between dual high-pressure discharge lamp banks and transformers thereof has the following drawback that two lamps in the same lamp bank separately receive from two outputs at the secondary side of the same transformer positive and negative voltages having the same magnitude but reverse polarities. For example, the lamp LP
11
in the first high-pressure discharge lamp bank LP
1
receives at a certain time point a positive voltage from the first output T
11
of the first transformer T
1
, while another adjacent lamp LP
12
in the same lamp bank LP
1
receives at the same time from the second output T
12
of the first transformer T
1
a negative voltage having a phase reverse to that of the positive voltage received by the lamp LP
11
. The high-pressure discharge lamps in the same lamp bank are very closely arranged, and there is an extremely large potential difference between two adjacent lamps. For example, in the case each of the high-pressure discharge lamps has a voltage of 500V, there will be an instantaneous maximum potential difference as high as 1000V between the positive and the negative voltage of two adjacent lamps. The closely arranged lamps in the same lamp bank and the extremely high potential difference between two adjacent lamps result in noises and mutual interference of these lamps with one another. The same situation also occurs in the second high-pressure discharge lamp bank LP
2
.
SUMMARY OF THE INVENTION
A primary object of the present invention is to provide a cross connection structure for dual high-pressure discharge lamp banks and transformers thereof to eliminate the drawback existing in the conventional connection manner, so that all high-pressure discharge lamps in the same lamp bank are maintained at a voltage having the same phase without the problem of mutual repulsion between two adjacent lamps.
To achieve the above and other objects, each high-pressure discharge lamp bank includes a plurality of high-pressure discharge lamps, and each transformer includes two outputs at the secondary side. First outputs of all transformers are separately connected to the high-pressure discharge lamps in a first lamp bank, while second outputs of all transformers are separately connected to the high-pressure discharge lamps in a second lamp bank. In this manner, all the high-pressure discharge lamps in the same lamp bank are maintained at a voltage having the same phase with a small potential difference among them. The lamps in the same lamp bank would not mutually repulse and can therefore be safely used. The problem of mutual interference due to noises caused by voltages of different phases and big potential difference can also be avoided.
REFERENCES:
patent: 4663566 (1987-05-01), Nagano
patent: 6201352 (2001-03-01), Ge et al.
patent: 6515427 (2003-02-01), Oura et al.
Hwa Young Co., Ltd.
Pro-Techtor Inter-national Services
Vo Tuyet T.
Wong Don
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