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US 20060146478A1
(19) United States
(12) Patent Application Publication (10) Pub. No.: US 2006/0146478 A1
(43) Pub. Date:
Martin
(54)
UNINTERRUPTED POWER SUPPLY FOR
Jul. 6, 2006
Publication Classi?cation
PROJECTION LAMP PROTECTION
(76) Inventor: Demian Martin, San Leandro, CA (US)
Correspondence Address:
LaRiviere, Grubman & Payne, LLP
P.O. Box 3140
Monterey, CA 93942 (US)
(21) Appl. No.:
11/029,030
(22) Filed:
Jan. 3, 2005
(51)
Int. Cl.
H01G 9/18
(52)
US. Cl. ............................................................ ..361/435
(2006.01)
(57)
ABSTRACT
An apparatus and method for protecting projection lamps 3
in computer monitors, projection television receivers, video
projectors 15, game displays and the like Which incorporates
a sensor 2 connected to a receiver 6 in an uninterruptible
poWer supply 1. Sensor 2 detects When the poWer has been
interrupted to lamp 3 and initiates a supply of poWer to a
cooler 8 in projector 15 to the device containing the lamp 3
and begins a normal shut doWn protocol. The shut doWn
protocol maintains cooling to lamp 3 alloWing lamp 3 to cool
T
to a temperature Where poWer may safely be discontinued.
Patent Application Publication
Jul. 6, 2006
US 2006/0146478 A1
m830E
Jul. 6, 2006
US 2006/0146478 A1
UNINTERRUPTED POWER SUPPLY FOR
PROJECTION LAMP PROTECTION
TECHNICAL FIELD
a poWer failure. The system provides driving currents and
voltages to a Wide variety of cooling systems. The altemat
ing current consumption of the projector Where the lamp is
located is monitored to detect loss of poWer and provide
alternative poWer When a poWer failure is detected. The
[0001] The present invention relates to uninterrupted
power supply systems and methods. More particularly, the
normal shut doWn protocol is preserved.
present invention relates to methods and apparatus for
protecting projection lamps in the event of a poWer supply
baseline for normal lamp operation. This baseline is then
interruption. With still greater particularity, the present
invention relates to protecting projection lamps in Wide
screen television receivers and monitors from thermal dam
age in the event of a poWer interruption.
BACKGROUND ART
[0002] The largest trend in consumer electronics is the
groWing popularity of Wide video screen display. Such
displays are particularly desirable for Digital Television
(DTV) and High De?nition Television (HDTV). These
displays are used for television reception, computer moni
tors and as game displays. There are several types of such
receivers/monitors in current use such as plasma displays,
liquid crystal displays, and projection displays. Projection
displays include video projectors Which project onto the
front of a re?ective screen and internal projectors, Which
include lenses and mirrors to proj ect an image on the rear of
a translucent screen. Projectors may include Liquid Crystal
Displays (LCD), Digital Light Processing (DLP), Liquid
Crystal on Silicon (LCOS), and Direct Drive Image Light
Ampli?er (DILA) image elements to convert an electronic
signal to a visual image. In all projection monitors light from
a projection lamp is directed toWard the image element and
then alloWed to produce the image on the screen. Projection
lamps are specialiZed to produce a bright image of uniform
brightness. This design restraint has made the projection
lamps quite expensive. Such a lamp commonly retails from
$100 to $1000. A cooler, such as a fan, provides cooling
during operation to prevent the lamp from overheating. In
[0005]
The ?rst step of the method is to establish a
stored. Next, a second baseline is learned for a “poWer o?‘"
condition. The devices learn the normal shut doWn proce
dure for the device it is connected to and stores this
information. This includes monitoring the poWer draW from
the projector and sensing When it decreases as it Would When
the lamp is shut doWn. If it does not respond in the
appropriate time, the shut doWn command is repeated until
the projector does shut doWn. In operation the UPS monitors
the poWer. When the poWer fails the UPS sends the learned
command sequence to the projector’s remote input via a
separate or contained LED IR transmitter. The UPS contin
ues the monitoring of the poWer consumption and repeats
the sequence until it senses the reduction of poWer from the
lamp having been shut doWn and then can maintain the
poWer to the projector until the fan cooling system has timed
out as it normally does under its normal shut doWn sequence.
The UPS continues to supply poWer to the projectors cooling
system until it also shuts doWn. The system then resets itself
upon resumption of poWer.
[0006]
The apparatus of the invention includes an Unin
terruptible PoWer Supply (UPS) equipped With a “leaming”
IR receiver and an IR transmitter capable of Working With
conventional remote codes. The IR transmitter transmits the
“poWer” or “poWer o?‘” code that it Was “taught” When the
incoming poWer fails. The UPS monitors the poWer con
sumption and repeats the code until it senses the reduction
of poWer from the lamp having been shut doWn and then can
maintain the poWer to the projector until the fan cooling
system has timed out as it normally does under its normal
shut doWn sequence. This Will protect the lamp from excess
order to protect the lamp, all such devices further include a
shut doWn protocol Wherein When the poWer is shut off the
cooler is still poWered for a predetermined amount of time
until the lamp has cooled. When there is a poWer failure the
thermal stress on unexpected shutdoWn and can extend the
lamp can often overheat resulting in destruction of the lamp
due to the fact that the cooler immediately shuts doWn While
the lamp retains a high temperature.
BRIEF DESCRIPTION OF THE DRAWING(S)
[0003] Uninterruptible PoWer Systems (UPS) are unable
to prevent this destruction. UPS include a plurality of
rechargeable batteries and circuitry to sense a loss of poWer
and use the batteries for poWer a brief period of time. UPS
are commonly used in computer systems to alloW hard disk
drives to continue operation after a brief interruption of
life of the lamp.
[0007]
For a better understanding of the present invention,
reference is made to the beloW referenced accompanying
draWings. Reference numbers refer to the same or equivalent
parts of the present invention throughout the several ?gures
of the draWings.
normal poWer, or alloW the user to folloW a normal shut
[0008] FIG. 1 is a block diagram ofa ?rst embodiment of
the circuit, in accordance With the present invention.
doWn When poWer is interrupted to computer systems. The
capacity of such UPS systems is insufficient to properly
poWer doWn a large projection lamp. On the other hand, if
[0009] FIG. 2 is a block diagram of the method of the
FIG. 1 embodiment, in accordance With the present inven
tion.
a UPS has suf?cient poWer to poWer the lamp, it Will
continue to poWer the lamp and the cooler until it exhausts
its poWer capacity then both Will stop, delaying but not
preventing damage. Such UPS systems provide no means
MODES FOR CARRYING OUT THE
INVENTION
for monitoring lamp operation and alloWing protection in the
event of an interruption of supply poWer.
DISCLOSURE OF THE INVENTION
[0004] The present invention addresses the current needs
for a system Which protects projection lamps in the event of
[0010] FIG. 1 is a block diagram ofa ?rst embodiment of
the circuit in accordance With the present invention. An
uninterruptible poWer supply 1 (UPS) is connected to an
external source of electrical poWer such as 117 volt AC
outlet. UPS 1 may be a home entertainment UPS similar to
the Home Theatre PoWerCenterTM HT UPS 1000 Uninter
Jul. 6, 2006
US 2006/0146478 A1
ruptible Power Supply manufactured by Monster Cable
Products, Inc. of Brisbane, Calif. UPS 1 as described in this
the next step 23 is to send a shut doWn signal. As described
above, this signal is identical to the signal used to turn off a
embodiment further includes a “smart” infrared receiver 6
given projector. Step 24 then initiates the shut doWn protocol
Which is capable of remembering signals 5 received. UPS 1
memoriZed in step 21 supplying poWer to the cooler and
cutting power off to the projection lamp. The sensor con
tinues to monitor 25 lamp temperature until it has safely
cooled. When the lamp has safely cooled, the method returns
26 the system to its initial settings.
learns the “o?‘” or “power” command from the user’s
remote, by the user directing the remote to the sensor in the
front of UPS 1 and pressing the command after pressing the
“learn” button on the UPS. Receiver 6 thus memoriZes the
shut doWn protocol for any projector or display to Which it
is connected. A projector 15 is connected to UPS 1 Which
supplies projector 15 With a source of uninterruptible poWer.
Projector 15 is illustrated as a standard video projector but
similar projection displays include video projectors Which
project onto the front of a re?ective screen and internal
projectors Which include lenses and mirrors to project an
image on the rear of a translucent screen. Projectors may
include Liquid Crystal Displays (LCD), Digital Light Pro
cessing (DLP), Liquid Crystal on Silicon (LCOS), and
Direct Drive Image Light Ampli?er (DILA) image elements
to convert an electronic signal to a visual image. All such
displays include a projection bulb 3 Which is typically
surrounded by a re?ector/shroud 7. A cooling device 8 is
connected to re?ector/ shroud 7 cool bulb 3 during operation.
Cooling device 8 is often a fan but in some cases a
thermionic cooler or liquid cooler may be used. Light from
projection lamp 3 next passes through or re?ects off of an
[0012]
Information as herein shoWn and described in
detail is fully capable of attaining the above-described object
of the invention, the presently preferred embodiment of the
invention, and is, thus, representative of the subject matter
Which is broadly contemplated by the present invention. The
scope of the present invention fully encompasses other
embodiments Which become obvious to those skilled in the
art, and is to be limited, accordingly, by nothing other than
the appended claims, Wherein reference to an element in the
singular is not intended to mean “one and only one” unless
explicitly so stated, but rather “one or more.” All structural
and functional equivalents to the elements of the above
described preferred embodiment and additional embodi
ments that are knoWn to those of ordinary skill in the art are
hereby expressly incorporated by reference and are intended
to be encompassed by the present claims.
Displays (LCD), Digital Light Processing (DLP), Liquid
[0013] Moreover, no requirement exists for a device or
method to address each and every problem sought to be
resolved by the present invention, for such to be encom
Crystal on Silicon (LCOS), or Direct Drive Image Light
passed by the present claims. Furthermore, no element,
Ampli?er (DILA) dependant upon application. A lens 10
component, or method step in the present disclosure is
intended to be dedicated to the public regardless of Whether
the element, component, or method step is explicitly recited
in the claims. HoWever, various changes and modi?cations
in form, material, and fabrication detail can be made Without
departing from the spirit and scope of the inventions as set
forth in the appended claims should be readily apparent to
those of ordinary skill in the art. No claim herein is to be
construed under the provisions of 35 U.S.C. § 112, sixth
image element 9. Image element 9 may be a Liquid Crystal
projects the image 12 onto a screen 13. A sensor 2 senses the
operation and poWer consumption of projection lamp 3 by
monitoring the poWer consumption of the projector. Sensor
2 could be an electrical sensor in UPS 1 monitoring the
poWer consumption of the projector. If sensor 2 determines
that the poWer consumption of the projector using lamp 3
has declined beloW normal operation standards, a signal
activates a transmitter 11 of the condition. Transmitter 11 is
an infrared remote control transmitter in this embodiment,
but could also be a radio link or even a hard Wired connec
tion to receiver 6 in UPS 1. The invention contemplates that
a signal 5 is identical to the “poWer” or “poWer o?‘" signal
sent by a remote control for projector 15. Upon receipt of
signal 5 receiver 6 begins the normal shut doWn procedure
of projector 15. This alloWs cooler 8 to continue to receive
poWer While lamp 3 does not receive poWer. Sensor 2
continues to monitor the situation until lamp 3 has safely
cooled.
[0011] FIG. 2 is a block diagram of the method of the
FIG. 1 embodiment, in accordance With the present inven
tion. The method ?rst step 21 is to alloW the receiver to
memorize the shut doWn protocol of the projector. This may
be easily accomplished by simply turning the projector on
and alloWing it to begin operation then pressing the “poWer”
or “poWer o?‘” button on the remote control. In projectors
Without a remote control, this is accomplished by pressing
the “poWer” sWitch to the “o?‘” position. The receiver Will
remember hoW a given projector shuts doWn. Normally,
poWer is immediately cut off to the lamp and poWer supplied
to a cooling fan for a given period, typically a couple
minutes. This alloWs the lamp to cool to a safe temperature.
The next step 22 is to monitor the poWer consumption. If
poWer is interrupted to the projector, there Will be a reduc
tion of poWer consumption. When this situation is indicated
paragraph, unless the element is expressly recited using the
phrase “means for.”
INDUSTRIAL APPLICABILITY
[0014] The present invention applies industrially to pro
jection display systems and methods. More particularly, the
present invention applies industrially to Computer Monitors,
Television Receivers, Audio Video Systems and Video Gam
ing Systems. Even more particularly, the present invention
applies industrially to the present invention applies indus
trially to Computer Monitors, Television Receivers, Audio
Video Systems and Video Gaming Systems With projection
lamps.
What is claimed:
1. A device for preventing damage to projection lamps in
projectors having a cooling system and a shut doWn protocol
on loss of external poWer comprising:
an uninterruptible poWer supply connected to the projec
tor for providing poWer in the event of loss of external
poWer,
a sensor for monitoring projector operation connected to
said uninterruptible poWer supply,
a memory connected to said uninterruptible poWer supply
for storing the projector shut doWn protocol, and
Jul. 6, 2006
US 2006/0146478 A1
wherein When said sensor detects a loss of power to said
12. A method as in claim 11, Wherein said initiation step
projector the shut doWn protocol stored in said memory
initiates the shut doWn protocol in the projector and
is performed by transmitting an infrared signal upon cessa
tion of poWer to said projector lamp.
13. A method as in claim 13, Wherein said infrared signal
said uninterruptible poWer supply.
2. A device as in claim 1, Wherein said sensor is an
infrared sensor.
3. A device as in claim 1, further comprising an infrared
is a remote control code.
14. A method as in claim 14, Wherein said infrared signal
is received by a receiver that memorized the shut doWn
receiver connected to said uninterruptible poWer supply and
protocol of the projector.
an infrared transmitter con?gured to detect a cessation of
15. A method as in claim 15, Wherein said infrared signal
is a code selected from the “poWer” and “power off’ codes
that it Was “taught” When the external poWer fails.
16. A method as in claim 16, Wherein said code is
repeatedly sent until the reduction of poWer from the lamp
indicates that it has been shut doWn and maintains the poWer
to the projector until the cooling system has timed out as it
poWer to said projector.
4. A device as in claim 3, Wherein said infrared transmitter
transmits remote control codes and said infrared receiver is
capable of receiving said remote control codes.
5. A device as in claim 4, Wherein said infrared receiver
is a learning receiver Which memoriZes the shut doWn
protocol of the projector.
6. A device as in claim 5, Wherein said infrared transmitter
transmits a code selected from the “poWer” and “poWer o?"
codes that it Was “taught” When the external poWer fails.
7. A device as in claim 6, Wherein said uninterruptible
poWer supply monitors the poWer consumption and repeats
the code until it senses the reduction of poWer from the lamp
having been shut doWn and then can maintain the poWer to
the projector until the cooling system has timed out as it
normally does under its normal shut doWn protocol.
8. A device as in claim 7, Wherein said cooling system is
a fan.
9. A device as in claim 5, Wherein said infrared transmitter
is connected to the projector.
10. A method for preventing damage to projection lamps
in projectors having a cooling system and a shut doWn
protocol on loss of external poWer comprising:
storing the projector shut doWn protocol,
monitoring projector operation for loss of external poWer,
normally does under its normal shut doWn protocol.
17. A method as in claim 17, Wherein said cooling system
is a fan.
18. A method as in claim 15, Wherein said signal is from
a transmitter connected to the projector.
19. A uninterruptible poWer supply device for preventing
damage to projection lamps in projectors having a cooling
system and a shut doWn protocol on loss of external poWer
comprising:
an stored supply of electrical potential connected to the
projector for providing poWer in the event of loss of
external poWer,
a sensor for monitoring projector operation connected to
said projector and capable of transmitting remote con
trol codes to said uninterruptible poWer supply,
a remote control code receiver having a memory con
nected to said uninterruptible poWer supply for storing
the projector shut doWn protocol, and
providing poWer in the event of loss of external poWer,
initiating said stored projector shut doWn protocol in the
event of the los of external poWer, and
continuing said steps until said lamp has safely cooled.
11. A method as in claim 10, Wherein said monitoring step
is performed by an infrared sensor.
Wherein When said sensor detects a loss of poWer to said
projector a remote control code is transmitted to said
receiver the initiating the shut doWn protocol in the
projector and said uninterruptible poWer supply.
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