TW594370B - The radiator of the overhead projector and its operation method - Google Patents

Abstract

A radiator of the overhead projector and its operation method, the radiator comprises the main control unit, the power supply transforming circuit, real-time clock, the battery, the memory, the lamp and the fan. While the overhead projector is started, the microprocessor will read the real time from the real-time clock, and compare it with the close time which read from the memory. As the difference between the real time and the close time is larger than the natural radiation time of the heat source, the microprocessor will output the start signal to enable the lamp, otherwise to enable the lamp after start the fan.

Description

V. Description of the invention α) Technical field to which the invention belongs The present invention relates to a heat sink and a method for operating the same, and more particularly to a heat sink and a method for operating a projection display. Prior technology In modern society, projection monitors have been used extensively, whether in school classes or company presentations. Or projection display televisions, which are gradually becoming popular, belong to this type of projection display. However, when using such a projection display, unless the projection display has been turned on in advance, after the projection display is turned on, it is often encountered that the bulb of the projection display cannot be started immediately, and the fan must be operated after the fan has been running for a period of time. When activated, this type of projection display can display images. This design is actually to protect the lamp. It is to prevent the lamp from shortening its life due to overheating, but it will delay the user's use of the projection display. Please refer to FIG. 3, which shows a circuit block diagram of a conventional heat dissipation device of a projection display. The conventional cooling device 3 0 0 of a projection display includes a microprocessor 3 1 0, an electrically erasable read-only memory 3 2 0, a fan 3 5 0, a high-voltage power supply circuit 3 6 0, and a direct current. Voltage / DC voltage converter 3 7 0. This heat dissipation device 300 uses a control fan 350 and a lamp starting circuit 3 300 to perform a heat dissipation operation on the lamp 3 40 to protect the life of the lamp 3 400. In the heat dissipating device 300, the fan 350 and the light bulb 340 are controlled by a microprocessor 3 0, and the microprocessor 3 1 0 and the light bulb starting circuit 3 3 0 are supplied with the required power by a high-voltage power supply circuit 3 6 0 . In addition, the microprocessor

10859twf. Ptd Page 8 V. Description of the Invention (2) 3 1 0 is also coupled to an electrically erasable read-only memory 3 2 0. The fan 3 500 provides the required DC voltage from the microprocessor 3 1 0, and the fan 3 5 will send a low level signal to the microprocessor 3 1 0 when it is running. The conventional heat-dissipating device 300 is used for dissipating heat when the user turns off the projection display according to the normal procedure. The fan 350 will continue to run for about one minute to dissipate the light from the lamp 3-40. When the projection display is activated again after the user improperly shuts down or the AC power supply stops supplying AC voltage, the microprocessor 3 1 0 will read the previous projection display from the electrically erasable read-only memory 3 2 0. Operation records. If it is found that the computer is not shut down under normal procedures, the microprocessor 3 1 0 will turn on the fan 3 5 0 and turn on the fan 3 5 0 for about one minute before turning on the light bulb 3 4 0. However, when the time when the projection display was turned off more than the natural heat dissipation time of the heat source of the light bulb 340, the light bulb 340 has already completely dissipated at this time. However, due to the design of the protection circuit, the projection display will still be turned on when it is turned on. Start the protection program, that is, turn on the fan 350 first to dissipate the light bulb 3400, and then turn on the light bulb 3440, which will cause a waste of power and time. To sum up, the conventional cooling device, regardless of whether the projection display is turned off under normal procedures or the lamp has already been completely cooled, starts the fan to dissipate heat when it is turned on, resulting in a waste of time for the projection display user and also a waste of time electric power. SUMMARY OF THE INVENTION Accordingly, the present invention is to provide a projection display having a heat dissipation device. This cooling device uses the added real-time timer, according to the reading

10859twf. Ptd Page 9 594370 V. Description of the invention (3) Take the real time and compare it with the accumulated time stored in its own memory. When the difference between this real time and the accumulated time exceeds the preset natural heat dissipation time of the heat source That is, you don't need to turn on the fan to dissipate the heat, you can directly turn on the bulb. The invention provides a method for operating a heat dissipation device of a projection display. When the power-off time exceeds the natural heat dissipation time of a heat source, if the projection display is turned on again, there is no need to start the fan to dissipate heat, thereby saving power and operating time. To achieve the above object, the present invention provides a heat radiation device for a projection display, which can provide at least one heat source inside the projection display. The heat dissipation device includes a power supply circuit, an instant timer, a main control unit, and a fan. The power supply circuit is used to supply at least one DC voltage. This real-time timer is coupled to the power supply circuit to count the current time without interruption. The main control unit is coupled to the power supply circuit and the real-time timer. It is used to read the current time of the real-time timer and write it into one of its non-volatile memory for storage. The written time is a real-time time. . The immediate time that has been written before the power is turned off is the last power-on time. And the main control unit accumulates a usage time after power-on, and the usage time written before the power is turned off is the last usage time, and this usage time is stored in the above non-volatile memory. In addition, the non-volatile memory of the main control unit stores a natural heat dissipation time interval for the heat source. The above-mentioned fan is coupled to the main control unit for receiving one of an on signal and a off signal from the main control unit. When the main control unit is powered on,

10859twf. Ptd Page 10 594370 V. Description of the invention (4) That is to read the time of the real-time timer to the above-mentioned real-time time, and calculate the time of the last power-on and the time of the last use as a cumulative time. Then compare the interval between the real time and the accumulated time, whether there is a difference between the natural heat dissipation time interval of the heat source. If it is smaller, then transmit an open signal to the fan. If it is larger, transmit a close signal to the fan to control the fan on and off. In the above-mentioned projection display heat sink, the main control unit includes a microprocessor and at least one non-volatile memory. The microprocessor is coupled to a power supply circuit, a real-time timer, and a fan. The non-volatile memory system is coupled to the microprocessor and is used to store the last boot time, the last use time, the instant time, the use time, and the natural heat dissipation time interval of the heat source, so as to provide the microprocessor with heat dissipation operation. Its operation mode, for example, the microprocessor can read the time of the real-time timer and store the time in non-volatile memory. The natural heat dissipation time interval of the heat source is written in the non-volatile memory in advance. The above-mentioned projection display heat dissipating device has a real-time timer and a backup power source in order to count the current time without interruption. In the above-mentioned projection display heat sink, the heat source is a light bulb in a preferred embodiment. The power supply circuit of the above-mentioned projection display heat sink is lightly connected to an AC voltage source. The power supply circuit includes an AC voltage / DC voltage converter and a DC voltage / DC voltage converter. The AC voltage / DC voltage converter is coupled to the AC voltage source for converting the AC voltage from the AC voltage source into a DC voltage and outputting the AC voltage. While converting

10859twf. Ptd Page 11 594370 V. Description of the invention (5) The DC voltage can be supplied to a heat source, such as a light bulb, to start the circuit. The DC voltage / DC voltage converter is coupled to the AC voltage / DC voltage converter, the main control unit and the real-time timer to convert the DC voltage from the AC voltage / DC voltage converter into a microprocessor and a real-time timer. It is output after the DC voltage required by the timer. In the above-mentioned projection display heat dissipation device, the non-volatile memory may be an electrically erasable read-only memory in a preferred embodiment. To achieve the above object, the present invention provides a heat dissipation method for a projection display, wherein the method is applied to a projection display provided with at least a main control unit, an instant timer, a fan, and a power supply. The aforementioned main control unit has a memory therein, and a natural heat dissipation time interval of a heat source is set in order to realize the heat dissipation operation. The above cooling method is that when the power of the projection display is turned on, the main control unit reads the current time from the real-time timer, and stores the time in its internal memory as a real-time time. At the same time, the main control unit Accumulate a usage time. In order to clearly illustrate the characteristics of the present invention, the instant that the main control unit reads from memory to be written before the power is turned off is defined as the last power-on time and the last use time, and one time is accumulated. The start-up time and the last use time are cumulative times, and are for convenience only. Next, subtract the accumulated time from the real-time time read this time to obtain a time interval, and compare whether the time interval is greater than the natural heat dissipation time interval of the heat source. If it is less than, then the on signal is transmitted to the fan. If it is greater, then the transmission Turn off the signal to the fan 0

10859twf.ptd Page 12 594370 V. Description of the invention (6) In the method for dissipating heat of a projection display, the main control unit includes a microprocessor and at least one non-volatile memory. The microprocessor is coupled to a power supply circuit, a real-time timer, and a fan. The non-volatile memory system is coupled to the microprocessor, and is used to store the last boot time, the last use time, the instant time, the use time, and the natural heat dissipation time interval of the heat source, so as to provide the microprocessor with heat dissipation operation. The operation mode is, for example, the microprocessor can read the time of the real-time timer and store the time in non-volatile memory. The natural heat dissipation time interval of the heat source is written in the non-volatile memory in advance. In the above-mentioned method for dissipating heat of a projection display, a real-time timer is connected to a backup power source in order to count the current time without interruption. In the aforementioned method for dissipating heat of a projection display, the heat source is a light bulb in a preferred embodiment. In order to make the above and other objects, features, and advantages of the present invention more comprehensible, a preferred embodiment is described below in detail with the accompanying drawings as follows: Implementation: Please refer to FIG. 1, It illustrates a circuit block diagram of a heat sink of a projection display according to a preferred embodiment of the present invention. The heat dissipation device 1 0 0 proposed in the present preferred embodiment includes a main control unit 1 1 0, an instant timer 1 2 0, a fan 1 3 0, a backup battery 1 4 0, and a power supply circuit 1 5 0. The cooling device 100 can control the fan 130 and the light bulb starting circuit 160, and can turn on or off the fan 130 or the light bulb 170 according to the setting, so as to achieve the heat dissipation operation of the present invention.

10859twf. Ptd Page 13 594370 V. Description of the invention (7) —- In the projection display of this document, the heat sink 1 00 uses the instantaneous time provided by the daytime timer 1 500 And compare the accumulated time stored in the main control unit 110, when the difference between the instant time and the accumulated time exceeds one of the preset natural heat dissipation time of the heat source, it is not necessary to turn on the fan 130 for heat dissipation, which can be directly Lamp start circuit 160, turn on the lamp 170. In the projection display of the present invention, when the power-off time exceeds the natural heat dissipation time of a heat source, if the projection display is turned on again, it is not necessary to start the fan to dissipate heat, so as to save power and operation time. In this embodiment, the real-time timer 50 is a sequential real-time timer of model DS 1 3 3 / in a preferred embodiment, but is not limited thereto. As long as a circuit having a function of counting the current time without interruption is applicable to the projection display of the embodiment of the present invention. If the real-time timer 150 is provided with an external power source for the projection display, the external power source can be used to provide the operating voltage, such as the AC voltage source shown in the figure. However, if the projection display is not connected to an external power source, the backup battery can be used to continuously supply the voltage to maintain the counted time. For example, the backup battery in the picture is 140 °. In the preferred embodiment, the main control unit 11 〇 Includes microprocessor 1 12 and non-volatile memory 丨 4. If you are familiar with this technology, microprocessor 1 1 2 can be a microprocessor of type 8 0 51, non-volatile memory. The body 1 1 4 can be an electrically erasable read-only memory (E 1 ectrica 1 1 y Erasable Programmable Read-Only Memory for short) (EEPROM), a flash memory (F 1 ash M emory), and so on. Limited. The aforementioned power supply circuit 150 includes an AC voltage / DC voltage conversion

10859twf. Ptd Page 14 594370 V. Description of the invention (8) Device 1 5 2 and DC voltage / DC voltage converter 1 5 4 The internal circuit connection relationship of the heat dissipation device 100 of this preferred embodiment and its action are: an AC voltage / DC voltage converter 15 2 is coupled to an AC voltage source, and the AC voltage supplied by the AC voltage source is converted into a DC voltage Output, DC voltage / DC voltage converter 1 5 4 connected to AC voltage / DC voltage converter 1 5 2, microprocessor 1 1 2, real-time timer 1 2 0, responsible for converting and supplying DC voltage to the microprocessor What is required for 1 1 2 is, for example, a direct voltage of 5 volts, and what is required for the instant timer 1 2 0 is, for example, a direct voltage of 3.3 volts. When the real-time timing Is 1 2 0 is connected to the backup battery 170, when the DC voltage / DC voltage converter 15 4 stops supplying the DC voltage, the battery 170 will supply the stored power without interruption. The microprocessor 1 1 2 is coupled to the DC voltage / DC voltage converter 1 5 4, the real-time timer 1 2 0, the non-volatile memory 1 1 4, the fan 1 4 0, the lamp start circuit 1 6 0 and the lamp 1 7 0. When the DC voltage / DC voltage converter 1 5 4 supplies DC voltage, it reads the current time from the instant timer 120, which is defined as the instant time. Then, the time of the last power-on and the time of the last power-on are read from the non-volatile memory 1 1 4. In order to clearly illustrate the characteristics of this embodiment, the main control unit 110 is defined here to read from the non-volatile memory 1 1 4. The immediate time that has been written before the power of the last projection display is turned off is defined as above One time to turn on, and the time from the last time the power of the projection display is turned on to the time it is turned off is defined as the last use time, and the accumulated time after adding the last time and the last use time is defined as the cumulative time. These definitions It is only for convenience to explain the operation of this embodiment.

10859twf.ptd Page 15 594370 V. Description of the invention (9) When comparing the interval between the real time and the accumulated time, is the difference between the natural heat dissipation time interval of the heat sources stored in the main control unit 1 10, that is, comparing the instant time and the accumulated The time interval and the natural heat dissipation time of the heat source. If the interval between the real time and the accumulated time is less than the natural heat dissipation time of the heat source, an on signal is transmitted to the fan 130 to turn on. If the time interval between the real time and the accumulated time is greater than the natural heat dissipation time of the heat source, a signal of turning off the signal fan 130 is transmitted to turn off the fan 130. Among them, in a selected embodiment, the natural heat dissipation time of the heat source is, for example, about 5 minutes, but it is not limited thereto, and the time can be adjusted according to design requirements. In a preferred embodiment of the present invention, the light bulb 130 is coupled to the AC voltage / DC voltage converter 15 2 via the light bulb starting circuit 160, and the required operating voltage is, for example, a DC of 380 volts. Voltage. Please refer to FIG. 2, which illustrates a flowchart of a method for operating a heat sink of a projection display according to a preferred embodiment of the present invention. In the following description of the operation method flow, please refer to the embodiment of FIG. 2 at the same time. The operation method is to first turn on the power of the projection display, that is, when the AC power source supplies AC voltage (S 2 0 2), the microprocessor 1 1 2 of the main control unit 1 1 0 reads the real time from the real time timer 1 2 0, respectively. The time is stored in the non-volatile memory 1 1 4. This is the defined real-time time, and the time used by the projection display is accumulated after the power is turned on, that is, the defined use time (S 2 0 4). Then, the microprocessor 1 1 2 in the main control unit 1 10 reads the last power-on time and the last use time from the non-volatile memory 1 1 4 (S 2 0 6). The instant time that was written before the power of the last projection display was turned off is defined as the last power-on time, and the last projection display

10.859twf. cumulative time. Then, if the difference between the real time and the accumulated time exceeds the natural heat dissipation time of the heat source (for example, about 5 minutes) (s 2 0 8), the microprocessor 1 1 2 stores the real time to the non-volatile memory 1 Conversely, if the difference between the two does not exceed the natural heat dissipation time of the heat source, for example, about 5 minutes, the microprocessor 1 1 2 in the main control unit 1 10 sends a start signal to start the fan 1 4 0, Let the lamp 170 cool (s212). The above step is to extend the life of the bulb 170. Turn on the light bulb 170 (s 2 1 4) when it is determined that the light bulb 170 has been cooled, and update the real-time and usage time in the non-volatile memory 1 1 4 (s 2 1 6) . When the microprocessor 1 1 2 sends a shutdown signal to turn off the light bulb 170 (s 2 1 8), the time when the light bulb was turned off and the use time are stored in the non-volatile memory 1 1 4 (s 2 2 0), If the microprocessor 1 1 2 determines that the light bulb 170 is continuously turned on, the real-time time (s 2 1 6) in the non-volatile memory 1 1 4 is updated every cycle time. This period can be designed as needed, for example, it can be about one minute in a preferred embodiment. To sum up, the heat dissipation device and operation method of the projection display of the present invention have the following advantages: (1) The heat dissipation device and operation method of the projection display of the present invention can automatically determine whether the light bulb is completely cooled, which can save electricity and time. Although the present invention has been disclosed as above with a preferred embodiment, it is not

10859twf. Ptd Page 17 594370 V. Description of the invention (11) It is used to limit the present invention. Any person skilled in the art can make some modifications and retouches without departing from the spirit and scope of the present invention. The scope of protection shall be determined by the scope of the attached patent application.

10859t.wf.ptd Page 18 594370 Brief Description of Drawings Brief Description of Drawings Figure 1 is a circuit block diagram of a heat sink of a projection display according to a preferred embodiment of the present invention; Figure 2 is a preferred view of the present invention A flowchart of an operation method of a heat dissipation device of a projection display according to an embodiment; and FIG. 3 is a circuit block diagram of a heat dissipation device of a conventional projection display. Description of the graphic symbols: 1 0 0, 3 0 0: heat dissipation device 1 1 0: main control unit 1 1 2, 3 1 0: microprocessor 1 1 4: memory 1 2 0: real-time timer 1 3 0, 3 5 0: Fan 1 4 0: Backup battery 1 5 0: Power supply circuit 1 5 2: AC voltage / DC voltage converter 1 5 4: DC voltage / DC voltage converter 1 6 0: Lamp start circuit 1 7 0 3 4 0: bulb 3 6 0: high voltage power supply circuit 3 2 0: electrically erasable read-only memory 3 3 0: bulb start circuit s 2 0 2 ~ s 2 2 0: each step flow

10859twf. Ptd Page 19

Claims (1)

594370 6. Scope of patent application1. A cooling device for a projection display for cooling at least one heat source inside the projection display. The cooling device includes: a power supply circuit for supplying at least a DC voltage; an instant timer, coupled To the power supply circuit for counting the current time without interruption; a main control unit coupled to the power supply circuit and a real-time timer; the main control unit is for reading the current time of the real-time timer; and It is stored in one of its non-volatile memory. This time is an instant time. The instant time that has been written before the power is turned off is the last time it was turned on. After the unit is turned on, it is accumulated and used. Time, the use time that was written before the power was turned off is the last use time, and the use time is stored in the non-volatile memory, where a heat source is stored in one of the non-volatile memory of the main control unit Natural cooling time interval; a fan coupled to the main control unit to receive one from the main control unit One of an on signal and a off signal, wherein when the power is turned on, the main control unit reads the time of the real-time timer and calculates the real-time time, and calculates the time of the last power-on and the time of the last use as one. The accumulated time is compared with the interval between the real time and the accumulated time, and whether the difference is up to the natural heat dissipation time interval of the heat source. If it is less than, the opening signal is transmitted to the fan, and if it is greater than the closing signal is transmitted to the fan. 2 · The heat dissipation device for a projection display as described in item 1 of the patent application scope, wherein the main control unit includes: 10859twf. Ptd Page 20 594370 Application scope of the patent The source should be placed in time, the microprocessor should be connected to the power supply circuit, the real-time timer and the fan; at least one non-volatile memory. Coupled to the microprocessor to store the last boot time, the last use time, the immediate time, the use time, and the natural heat dissipation time interval of the heat source, wherein the microprocessor can read the instant timer The time is stored in the non-volatile memory, and the time interval for the natural heat dissipation of the heat source is written in the non-volatile memory in advance. 3. The cooling device of the projection display according to item 1 of the scope of patent application, the real-time timer is also connected with a backup power supply. 4 · The heat dissipating device for the projection display as described in item 1 of the scope of patent application, wherein the heat source is a light bulb. 5. The heat dissipation device for a projection display as described in item 4 of the scope of patent application, wherein the power supply circuit is coupled to an AC voltage source and includes: an AC voltage / DC voltage converter coupled to the AC voltage, and The AC voltage from the AC voltage source is converted into the direct voltage and output, wherein the converted DC voltage can be supplied to the starting circuit of the light bulb; and a DC / DC voltage converter is coupled to The AC voltage / current voltage converter, the main control unit and the real-time timer are used to convert the DC voltage from the AC voltage / DC voltage converter into the DC required by the microprocessor and the real-time timer. Output after voltage. 6 · The heat dissipating device for the projection display as described in item 1 of the scope of patent application, the non-volatile memory system is an electrically erasable read-only memory. m I 10859twf.ptd Page 21 594370 6. Scope of patent application 7. A method for heat dissipation of a projection display, wherein the method is applied to a method including at least a main control unit, an instant timer, a fan and a power supply In the projection display, one of the main control units has a natural heat dissipation time interval set in the memory. The cooling method includes the following steps: When the power of the projection display is turned on, the main control unit reads from the real-time timer. The current time is stored in its internal memory as an instant time. At the same time, the main control unit accumulates a usage time after powering on; the main control unit has been read from the memory before a power-off. The written instant time is the last boot time and the last use time; the last boot time and the last use time are added up to a cumulative time; the instant time read from this boot is subtracted Remove the accumulated time and obtain a time interval; compare whether the time interval is greater than the natural heat dissipation time of the heat source After that, if it is less than, the turn-on signal is transmitted to the fan, and if it is greater, the turn-off signal is transmitted to the fan. 8. The method for dissipating heat of a projection display according to item 7 of the scope of patent application, wherein the main control unit comprises: a microprocessor coupled to the power supply circuit, a real-time timer, and the fan; and at least one non-volatile Sex memory, coupled to the microprocessor, 10859twf. Ptd Page 22 594370 6. Scope of patent application to store the last boot time, last use time, the instant time, the use time and the natural heat dissipation time interval of the heat source, where the microprocessor is available for reading The time of the real-time timer is stored in the non-volatile memory, and the natural heat dissipation time interval of the heat source is written in the non-volatile memory in advance. 9. The method for dissipating heat of a projection display according to item 7 of the scope of patent application, wherein the heat source is a light bulb. 10859twf. Ptd Page 23