CN109510959B - Control method and control system for preventing laser television from overheating - Google Patents
Control method and control system for preventing laser television from overheating Download PDFInfo
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- CN109510959B CN109510959B CN201811268283.2A CN201811268283A CN109510959B CN 109510959 B CN109510959 B CN 109510959B CN 201811268283 A CN201811268283 A CN 201811268283A CN 109510959 B CN109510959 B CN 109510959B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/64—Constructional details of receivers, e.g. cabinets or dust covers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/63—Generation or supply of power specially adapted for television receivers
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20954—Modifications to facilitate cooling, ventilating, or heating for display panels
- H05K7/20972—Forced ventilation, e.g. on heat dissipaters coupled to components
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Abstract
The invention discloses a control method and a control system for preventing a laser television from overheating, wherein the method comprises the following steps: A. judging whether the laser television is powered off or not during working; B. if the laser television is powered off, the power supply protection unit supplies power to the control module, the control module maintains the operation and heat removal of the cooling fan for a certain time, and then the control module enters a power-saving mode; C. if the laser television is not powered down, the power supply board supplies power to the control module, the control module controls the heat dissipation fan to normally operate to dissipate heat, and the power-off protection unit is added in a fan circuit of the laser television, so that the risk that the fan stops dissipating heat suddenly is avoided, the laser television can be effectively protected, in addition, the core board of the laser television still needs to use power to maintain different states in a standby mode, and after the method is shut down, the core board of the laser television does not consume power, the power consumption is zero, so that the power consumption of the laser television is reduced, and the cost is saved.
Description
Technical Field
The invention relates to the technical field of laser televisions, in particular to a control method and a control system for preventing a laser television from being overheated.
Background
In recent years, laser televisions have been rapidly developed due to their great advantages in cost, picture size, volume, and cost performance. The laser television is a projector which uses a solid laser light source and adopts a reflective ultra-short-focus projection technology to project light onto a curtain, the core component of the projector is an optical machine, the core element is a solid laser, when the laser television works, the solid laser can generate a large amount of heat, the laser television generates thermal degradation due to the accumulation of the heat, the imaging quality of a projected image is seriously reduced, and the service life of a laser device is also reduced. In the current practice, as shown in fig. 1, fig. 1 is a circuit diagram of a conventional laser television fan control circuit, and a pop-up prompt box is pressed for the first time by a button to inquire whether to enter a "standby" mode, and when the pop-up prompt box is pressed for the second time, the fan enters the standby mode after running for tens of seconds, and the fan stops and turns off unnecessary power. However, if someone (such as a child) accidentally pulls out the power line during the operation of the laser television, or just fails the power supply, the fan is immediately stopped, and therefore, the laser television has a risk that the fan suddenly stops heat extraction.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
Therefore, it is necessary to provide a control method and a control system for preventing the laser television from overheating, in order to solve the above technical problems, by adding a power-off protection unit in a fan circuit of the laser television, the risk of the laser television that the fan stops suddenly to discharge heat is avoided, the laser television can be effectively protected, in addition, the core board of the laser television still needs to be maintained with different power consumption in a standby mode, and after the method is shut down, the core board of the laser television does not consume power, and the power consumption is zero.
A control method for preventing laser television from overheating comprises the following steps:
A. judging whether the laser television is powered off or not during working;
B. if the laser television is powered off, the power supply protection unit supplies power to the control module, the control module maintains the operation and heat removal of the cooling fan for a certain time, and then the control module enters a power-saving mode;
C. if the laser television is not powered down, the power supply board supplies power to the control module, and the control module controls the heat dissipation fan to normally operate to dissipate heat.
The invention further provides that step a further includes step a 0:
when the laser television works, a power line of the laser television is connected into a power grid, the power-off protection unit is charged at the same time, and the laser television is automatically disconnected and charged after being fully charged.
The invention further provides that step a specifically comprises:
a1, acquiring terminal voltage of the control module;
a2, judging whether the terminal voltage of the control module is consistent with the output voltage of the power panel, if so, indicating that power failure does not occur;
a3, if the terminal voltage of the control module is lower than the output voltage of the power panel, it indicates that the laser television has power failure, and at this time, the power is supplied to the control module through the power failure protection unit.
The invention further provides that step C specifically comprises:
c1, pressing a button switch, and judging the working state of the relay through the control module to judge the on-off intention of a user;
c2, if the relay is in the off state, which indicates that the user needs to start the machine, the control module outputs a relay voltage VJ to close the relay, and at the moment, the power panel and the power grid are in the on state, the power panel supplies power to the control module, and the control module outputs a cooling fan voltage VF to maintain the normal operation of the cooling fan;
and C3, if the relay is in a closed state, indicating that the user needs to shut down, the control module closes the relay and the voltage of the cooling fan after maintaining for a certain time, and the subsequent electric appliance is in an open state after closing, wherein the cooling fan still normally operates to discharge heat during the maintaining period.
The invention is further provided that the power-off protection unit comprises a charging circuit, a lithium battery and a diode for connecting or disconnecting the control module and the lithium battery, the charging circuit is connected with a power grid through a power line, the other end of the charging circuit is electrically connected with the lithium battery, the output voltage of the lithium battery is consistent with the output voltage of the power panel, and the diode is connected between the control module and the lithium battery.
According to a further arrangement of the present invention, if there is a voltage drop of 0.6V in the diode, the voltage output by the power-off protection unit to the control module is lower than the voltage output by the power panel to the control module.
The invention further sets that when the laser television works normally, the voltage value output to the control module by the power panel is 12V.
A control system for preventing laser television from overheating comprises a power panel, a heat radiation fan, a button switch, a control module, a power-off protection unit and a relay for connecting or disconnecting the power panel and a power grid, wherein the control module is respectively electrically connected with the power panel, the heat radiation fan, the relay, the button switch and the power-off protection unit, when the laser television normally works, the power panel supplies power to the control module, the control module judges the working state of the relay and judges the intention of switching on and off the laser television according to the working state of the relay, if the laser television needs to be switched off, the control module stops working after maintaining a certain time, the heat radiation fan continues to work during working, if the control module detects that power failure occurs, the power is continuously supplied to the control module through the power-off protection unit, and the heat radiation fan continues to work for a period of time, the control module then enters a power saving mode.
The invention is further provided that the power-off protection unit comprises a charging circuit, a lithium battery and a diode for connecting or disconnecting the control module and the lithium battery, wherein the charging circuit is connected with a power grid through a power line, the power line of the laser television is connected to the power grid during working, the lithium battery is charged through the charging circuit, and the lithium battery is automatically disconnected after being fully charged.
The invention is further provided that the diode is connected between the control module and the lithium battery, the output voltage of the lithium battery is consistent with the voltage output by the power panel to the control module, and when the voltage output by the power-off protection unit to the control module is lower than the voltage output by the power panel to the control module, the laser television is powered off due to the voltage drop of 0.6V of the diode.
The control method and the control system for preventing the laser television from overheating comprise the following steps: a0, when the laser television works, a power line of the laser television is connected to a power grid, and the power-off protection unit is charged and is automatically disconnected after being fully charged; A. judging whether the laser television is powered off or not during working; B. if the laser television is powered off, the power supply protection unit supplies power to the control module, the control module maintains the operation of the cooling fan to remove heat, and then the control module enters a power saving mode; C. if the laser television is not powered down, the power supply board supplies power to the control module, the control module controls the heat dissipation fan to normally operate to dissipate heat, and the power-off protection unit is added in a fan circuit of the laser television, so that the risk that the fan stops dissipating heat suddenly is avoided, the laser television can be effectively protected, in addition, the core board of the laser television still needs to use power to maintain different states in a standby mode, and after the method is shut down, the core board of the laser television does not consume power, the power consumption is zero, so that the power consumption of the laser television is reduced, and the cost is saved.
Drawings
Fig. 1 is a schematic diagram of a fan control circuit in a control system of a conventional laser television;
FIG. 2 is a flow chart illustrating a control method for preventing overheating of a laser television according to one embodiment;
FIG. 3 is a schematic control flow diagram illustrating a control method for preventing overheating of a laser television according to an embodiment;
fig. 4 is a schematic diagram of a fan control circuit in a control system for preventing overheating of a laser television according to an embodiment.
Reference numerals
1. A power panel; 2. a push button switch; 3. a heat radiation fan; 4. a power line; 5. a relay; 200. a power-off protection unit;
21. a charging circuit; 22. a lithium battery; 23. a diode; 210. and a control module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In one embodiment, as shown in fig. 2, there is provided a control method for preventing overheating of a laser television, comprising the steps of:
s100, when the lithium battery works, a plug is connected into a power grid, a charging circuit charges the lithium battery, and the lithium battery is fully charged and automatically disconnected;
specifically, the relay is disconnected by default when no power exists, the laser television does not work, a power line of the laser television is connected to a 220V power grid when the laser television works, the lithium battery is charged by the charging circuit and automatically disconnected after being fully charged, and the lithium battery is fully charged so that the lithium battery supplies power to the control module when the laser television is powered off.
S110, judging whether the laser television is powered off or not;
specifically, the terminal voltage of the control module is obtained, if the terminal voltage of the control module is consistent with the output voltage of the power panel, it is indicated that power failure does not occur, if the terminal voltage of the control module is lower than the output voltage of the power panel, it is indicated that power failure occurs in the laser television, and at the moment, power is supplied to the control module through the power-off protection unit.
Wherein, the power-off protection unit comprises a charging circuit, a lithium battery and a diode for switching on or off the control module and the lithium battery, the charging circuit is electrically connected with a power grid through a power line, the other end of the charging circuit is electrically connected with the lithium battery, the output voltage of the lithium battery is consistent with the output voltage of the power panel, the voltage value output by the power panel to the control module is 12V, the diode is connected between the control module and the lithium battery, the voltage drop of 0.6V exists in the diode, the voltage output by the power-off protection unit to the control module is lower than the voltage output by the power panel to the control module, if the 220V power is suddenly cut off, the power panel 12V has no output, the diode is automatically switched on, the lithium battery 12V supplies power to the control module through the diode, and the voltage of the control module is 11.4V due to the voltage, judging whether power failure occurs or not based on the following steps: if the terminal voltage of the control module is 12V, the normal work is indicated, and if the terminal voltage of the control module is 11.4V or lower, the power failure occurs.
S120, if the laser television is powered off, the power supply protection unit supplies power to the control module, the control module maintains the operation and heat removal of the cooling fan for a certain time, and then the control module enters a power saving mode;
specifically, the diode is automatically conducted after the laser television is powered down, the control module is powered by the lithium battery and only maintains the voltage of the output cooling fan for 20 seconds, so that the fan operates to discharge heat and protect the laser television, and then the control module enters a power saving mode.
S130, if the laser television is not powered down, the power supply board supplies power to the control module, and the control module controls the heat dissipation fan to normally operate to dissipate heat;
specifically, when the button switch is pressed, if the relay is in the "on" state, it indicates that the user wants to turn off the laser television, the control module maintains the operation of the cooling fan for 20 seconds and then stops the operation, and the relay is turned off.
When the button switch is pressed, if the relay is in an off state, the user wants to start the machine, the control module outputs the voltage of the relay, the relay is closed, the power grid is connected to the power panel, the power panel outputs 12V and other working voltages, the diode is reversely biased to be cut off, the power panel 12V supplies power to the control module, the control module outputs the voltage of the fan, and the heat dissipation fan operates to dissipate heat.
The present invention will be further explained with reference to fig. 3, and the working principle thereof is as follows:
s00, starting;
s10, when the lithium battery works, the plug is connected to a power grid, the charging circuit charges the lithium battery, and the lithium battery is full and automatically disconnected;
s20, judging whether the laser television is powered off, if so, executing steps S30 and S40, otherwise, executing step S50;
s30, the power-off protection unit supplies power to the control module, the control module maintains the output fan voltage for a period of time, the fan operates to remove heat and protect the laser television, and then the control module enters a power-saving mode;
s40, turning off the laser television;
s50, judging whether the button switch is pressed, if yes, executing a step S60, otherwise, returning to the step S20;
s60, judging the working state of the relay, if the relay is in the 'closed' state, executing steps S70 and S80, and if the relay is in the 'open' state, executing steps S90 and S100;
s70, the control module maintains the operation of the cooling fan for 20 seconds, then the fan voltage and the relay voltage are closed, the relay is disconnected, the fan still operates to discharge heat during the maintenance period, and the laser television is protected;
s80, the laser television is in a power-off state;
s90, the control module outputs relay voltage, the relay is closed, the power grid is connected to the power panel, the power panel outputs 12V and other working voltages, the diode is reversely biased to be cut off, the power panel 12V supplies power to the control module, the control module outputs fan voltage, and the heat radiation fan operates to discharge heat;
s100, the laser television is in a normal working state, and the step S20 is returned;
and S110, ending.
In the control method for preventing the laser television from being overheated, no matter what reason, the protection circuit can be triggered to work as long as 220V power failure occurs, namely, a power failure protection unit is added in a laser television fan control circuit, even if the laser television is powered down, a lithium battery can still supply power to a control module for a period of time to ensure that the fan continues to work for a period of time, discharges heat and then automatically stops, so that the risk that a heat radiation fan suddenly stops to discharge heat is avoided, the laser television is effectively protected, in addition, the power consumption of a laser television core board is still different from that of the laser television core board in a standby mode, the laser television is still connected with a power grid after the laser television is shut down, and standby power consumption exists, after the method is shut down, a relay is in a 'disconnected' state, namely, the laser television power supply board is disconnected with the power, the power consumption is zero, so that the power consumption of the laser television is reduced, and the cost is saved.
In an embodiment, a control system for preventing overheating of a laser television is provided, as shown in fig. 4, fig. 4 is a schematic diagram of a fan control circuit in the control system for preventing overheating of a laser television in this embodiment, and includes a power board 1, a heat dissipation fan 3, and a button switch 2, and further includes a control module 210, a power-off protection unit 200, and a relay 5 for connecting or disconnecting the power board 1 and a power grid, where the control module 210 is electrically connected to the power board 1, the heat dissipation fan 3, the relay 5, the button switch 2, and the power-off protection unit 200, respectively.
When the laser television normally works, the power panel 1 supplies power to the control module 210, the control module 210 judges the working state of the relay 5, and judges the intention of turning on and off the laser television according to the working state of the relay 5, if the laser television needs to be turned off, the control module 210 stops working after maintaining for 20 seconds, the cooling fan 3 continues working during the working period, if the control module 210 detects that power failure occurs, the power is continuously supplied to the control module 210 through the power failure protection unit 200, the cooling fan 3 continues working for 20 seconds, and then the control module 210 enters a power saving mode.
Further, the power-off protection unit 200 includes a charging circuit 21, a lithium battery 22, and a diode 23 for turning on or off the control module 210 and the lithium battery 22, where the diode 23 is a switching diode, and in this application, a low-power switching diode of 1N4148, 1N4152, 1N4151, etc. is selected, the charging circuit 21 is electrically connected to a power grid through a power line 4, and when the power line 4 of the laser television is connected to the power grid, the lithium battery 22 is charged through the charging circuit 21, and is automatically turned off after being fully charged.
Further, the control module 210 further includes a relay 5 and a driving control circuit of the cooling fan 3.
Specifically, when the button switch 2 is pressed, and it is detected that the relay 5 is in an off state, the control module 210 outputs a relay voltage VJ, the relay 5 is pulled in, so that the power grid is connected to the power board 1, the power board 1 outputs 12V and other working voltages, the diode 23 is reversely biased to be cut off, which is equivalent to the suspension of the lithium battery 22, the power board 1 outputs 12V to supply power to the control module 210, the control module 210 outputs a fan voltage VF, and the cooling fan 3 drives the control circuit to drive the cooling fan 3 to operate to remove heat.
Further, the diode 23 is connected between the control module 210 and the lithium battery 22, the output voltage of the lithium battery 22 is the same as the voltage output by the power panel 1 to the control module 210, and since the diode 23 has a voltage drop of 0.6V, when the voltage output by the power-off protection unit 200 to the control module 210 is lower than the voltage output by the power panel 1 to the control module 210, it indicates that the laser television is powered off.
Specifically, when the laser television is powered down, that is, 220V is powered down, the power panel 1 has no output, the diode 23 is automatically turned on, the lithium battery 22 outputs 12V to supply power to the control module 210 through the diode 23, and since the diode 23 has a voltage drop of 0.6V, the voltage across the control module 210 is 11.4V, whether the power down occurs is judged based on the voltage drop: if the control module 210 terminal voltage is 12V, normal operation is indicated, and if the control module 210 terminal voltage is 11.4V or lower, power down occurs.
In the control system for preventing the laser television from overheating in this embodiment, the relay 5 is turned off by default when no power is supplied, the laser television does not enter a working state, the power line 4 of the laser television is connected to a 220V power grid when the laser television is in working, the charging circuit 21 charges the lithium battery 22, the lithium battery 22 is fully charged and automatically turned off, when the laser television is in the working state, both ends of the diode 23 are 12V, the diode 23 is turned off, which is equivalent to the suspension of the lithium battery 22, at this time, the power supply board 1 supplies power, after the button switch 2 is pressed, if a user wants to turn on the laser television, the control module 210 outputs the voltage VJ of the relay 5, the relay 5 is closed, the power grid is connected to the power supply board 1, the power supply board 1 outputs 12V and other working voltages, the power supply board 1 outputs 12V to the control module 210, the control module 210 outputs, and then the fan voltage and the relay 5 voltage are turned off, the relay 5 is turned off, the heat radiation fan 3 still operates to discharge heat during the maintenance period, the risk that the heat radiation fan 3 stops discharging heat suddenly is avoided, and the laser television is effectively protected.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. A control method for preventing laser television from overheating is characterized by comprising the following steps:
A. judging whether the laser television is powered off or not during working; the laser television comprises a power panel, a button switch and a relay for connecting or disconnecting the power panel and a power grid;
B. if the laser television is powered off, the power supply protection unit supplies power to the control module, the control module maintains the operation and heat removal of the cooling fan for a certain time, and then the control module enters a power-saving mode;
C. if the laser television is not powered down, the power supply board supplies power to the control module, and the control module controls the heat dissipation fan to normally operate to dissipate heat;
the step C specifically comprises the following steps:
c1, pressing the button switch, and judging the working state of the relay through the control module to judge the intention of the user to turn on or off the computer;
c2, if the relay is in the off state, which indicates that the user needs to start the machine, the control module outputs a relay voltage VJ to close the relay, and at the moment, the power panel and the power grid are in the on state, the power panel supplies power to the control module, and the control module outputs a cooling fan voltage VF to maintain the normal operation of the cooling fan;
c3, if the relay is in the closed state, it indicates that the user needs to shut down, the control module turns off the voltage between the relay and the cooling fan after maintaining for a certain time, and the relay is in the open state after turning off, wherein the cooling fan still operates normally to discharge heat during the maintaining period;
after the laser television is turned off, the relay is in a disconnected state, and the power panel and the power grid are in a disconnected state; the power-off protection unit comprises a charging circuit, a lithium battery and a diode for switching on or off the control module and the lithium battery, the charging circuit is connected with a power grid through a power line, the other end of the charging circuit is electrically connected with the lithium battery, the output voltage of the lithium battery is consistent with the output voltage of the power panel, the diode is connected between the control module and the lithium battery,
if the power supply board is suddenly powered off, the power supply board has no output, the diode is automatically conducted, and the lithium battery supplies power to the control module through the diode.
2. The control method for preventing the laser television from being overheated according to claim 1, wherein the step a is preceded by a step a 0:
when the laser television works, a power line of the laser television is connected into a power grid, the power-off protection unit is charged at the same time, and the laser television is automatically disconnected and charged after being fully charged.
3. The control method for preventing the laser television from being overheated according to claim 1, wherein the step a specifically comprises:
a1, acquiring terminal voltage of the control module;
a2, judging whether the terminal voltage of the control module is consistent with the output voltage of the power panel, if so, indicating that power failure does not occur;
a3, if the terminal voltage of the control module is lower than the output voltage of the power panel, it indicates that the laser television has power failure, and at this time, the power is supplied to the control module through the power failure protection unit.
4. The control method of claim 1, wherein if there is a voltage drop of 0.6V in the diode, the voltage outputted from the power-off protection unit to the control module is lower than the voltage outputted from the power board to the control module.
5. The control method of claim 4, wherein the voltage value output by the power board to the control module is 12V when the laser television is in normal operation.
6. A control system for preventing laser television from overheating comprises a power panel, a heat radiation fan and a button switch, and is characterized by further comprising a control module, a power-off protection unit and a relay for connecting or disconnecting the power panel and a power grid, wherein the control module is respectively electrically connected with the power panel, the heat radiation fan, the relay, the button switch and the power-off protection unit, when the laser television normally works, the power panel supplies power to the control module, the control module judges the working state of the relay and judges the intention of switching on and off the laser television according to the working state of the relay, if the laser television needs to be switched off, the control module stops working after maintaining a certain time, the heat radiation fan continues to work during working, and if the control module detects that power failure occurs, the power failure protection unit continues to supply power to the control module, maintaining the heat radiation fan to continuously work for a period of time, and then enabling the control module to enter a power saving mode;
when the button switch is pressed down, the working state of the relay is judged through the control module so as to judge the power-on and power-off intention of a user; if the relay is in an off state, which indicates that a user needs to start up, the control module outputs a relay voltage VJ to close the relay, and the power panel and the power grid are in an on state at the moment, the power panel supplies power to the control module, and the control module outputs a cooling fan voltage VF to maintain the normal operation of the cooling fan; if the relay is in a closed state, which indicates that a user needs to shut down, the control module closes the voltage between the relay and the cooling fan after maintaining for a certain time, and the relay is in an open state after closing, wherein the cooling fan still normally operates to discharge heat during the maintaining period;
after the laser television is turned off, the relay is in a disconnected state, and the power panel and the power grid are in a disconnected state; the power-off protection unit comprises a charging circuit, a lithium battery and a diode for switching on or off the control module and the lithium battery, the charging circuit is connected with a power grid through a power line, the other end of the charging circuit is electrically connected with the lithium battery, the output voltage of the lithium battery is consistent with the output voltage of the power panel, the diode is connected between the control module and the lithium battery,
if the power supply board is suddenly powered off, the power supply board has no output, the diode is automatically conducted, and the lithium battery supplies power to the control module through the diode.
7. The control system for preventing the laser television from being overheated as claimed in claim 6, wherein the diode has a voltage drop of 0.6V, and when the voltage outputted from the power-off protection unit to the control module is lower than the voltage outputted from the power board to the control module, it indicates that the laser television is powered down.
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| CN2772191Y (en) * | 2005-03-11 | 2006-04-12 | 联想(北京)有限公司 | Electronic device with radiating control circuit |
| CN101489071A (en) * | 2008-01-15 | 2009-07-22 | 深圳市科创数字显示技术有限公司 | System for preventing optical projection television from abnormal shutdown and implementing method thereof |
| CN202334731U (en) * | 2011-11-09 | 2012-07-11 | 上海广擎光电科技有限公司 | Heat dissipation protection device for microcrystal optical display rear-projection television |
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| CN109510959A (en) | 2019-03-22 |
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