Projection device and control method thereof

Abstract

The present application provides a kind of projection device and its control method, the projection device includes power conversion unit, first detection unit, second detection unit, operation unit and control unit.By operation unit receives the first voltage detection value from first detection unit and the current detection value from second detection unit, operation unit calculates the total power consumption value according to current detection value, control unit controls the power consumption of at least one energy-consuming component according to the first voltage detection value and total power consumption value, so the operation power consumption of projection device can be well controlled, so that the projection device achieves the best brightness effect.

Description

Technical Field

[0001] This invention relates to the field of optics, and in particular to a projection device and its control method. Background Technology

[0002] According to power consumption specifications, existing projection devices have different power consumption thresholds under different voltage operating conditions. When a projection device exceeds the corresponding power consumption threshold, the current method of limiting the power consumption of the projection device is to restrict it to a fixed percentage (e.g., 80%) to comply with the power consumption specifications. However, this method excessively restricts the power consumption of the projection device, causing the projection device to fail to achieve optimal brightness.

[0003] Therefore, a better solution needs to be proposed to address the shortcomings of the existing technology.

[0004] The "Background Art" paragraph is only used to help understand the content of this invention. Therefore, the content disclosed in the "Background Art" paragraph may include some prior art that is not known to those skilled in the art. The content disclosed in the "Background Art" paragraph does not represent the problems to be solved by the content or one or more embodiments of this invention, nor does it represent that it was known or recognized by those skilled in the art prior to this application. Summary of the Invention

[0005] The main objective of this invention is to provide a projection device and its control method, which improves the power consumption control mechanism of the projection device to better control the operating power consumption of the projection device and enable the projection device to achieve optimal brightness.

[0006] Other objects and advantages of the present invention can be further understood from the technical features disclosed herein.

[0007] To achieve one or more of the above-mentioned objectives, or other objectives, an embodiment of the present invention provides a projection device including a power conversion unit, a first detection unit, a second detection unit, an arithmetic unit, and a control unit. The power conversion unit is coupled to at least one power-consuming element; the first detection unit is coupled to the input terminal of the power conversion unit and is used to detect the voltage input to the power conversion unit to generate a first voltage detection value. The second detection unit is coupled to either the input or output terminal of the power conversion unit and is used to detect the current at either the input or output terminal of the power conversion unit to generate a current detection value. The arithmetic unit is coupled to both the first and second detection units and is used to calculate the total power consumption of the corresponding at least one power-consuming element based on the current detection value, and output the first voltage detection value and the total power consumption value. The control unit is coupled to the arithmetic unit and the at least one power-consuming element and is used to control the power consumption of the at least one power-consuming element based on the first voltage detection value and the total power consumption value.

[0008] To achieve one or more of the above-mentioned objectives or other objectives, an embodiment of the present invention provides a control method for a projection device. The projection device includes a power conversion unit, a first detection unit, a second detection unit, a processing unit, and a control unit. The control method includes the following steps: the first detection unit detects the voltage input to the power conversion unit to generate a first voltage detection value; the second detection unit detects the current at the input or output terminal of the power conversion unit to generate a current detection value; the processing unit calculates the total power consumption value corresponding to at least one power-consuming element based on the current detection value, and outputs the first voltage detection value and the total power consumption value; the control unit controls the power consumption value of at least one power-consuming element based on the first voltage detection value and the total power consumption value.

[0009] Based on the above, the embodiments of the present invention have at least one of the following advantages or effects. In the embodiments of the present invention, the arithmetic unit calculates the total power consumption of at least one power-consuming element based on the current detection value, and the control unit controls the power consumption of at least one power-consuming element based on the first voltage detection value and the total power consumption value, thereby achieving good control of the operating power consumption of the projection device and enabling the projection device to achieve optimal brightness.

[0010] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings. Attached Figure Description

[0011] Figure 1 This is a block diagram of a first embodiment of the projection device of the present invention;

[0012] Figure 2 This is a block diagram of a second embodiment of the projection device of the present invention;

[0013] Figure 3 A graph showing the relationship between the pulse width modulation parameters of the light source and the current in the light source module of a projection device according to an embodiment of the present invention.

[0014] Figure 4 This is another block diagram of a second embodiment of the projection device of the present invention;

[0015] Figure 5 A flowchart illustrating an embodiment of the control method for the projection device of the present invention;

[0016] Figure 6 This is another flowchart illustrating an embodiment of the control method for the projection device of the present invention. Detailed Implementation

[0017] The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front, or back, are merely for reference to the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the present invention.

[0018] Regarding the projection device 1 of one embodiment of the present invention, please refer to [link to relevant documentation]. Figure 1 and Figure 2 As shown, the projection device 1 includes a power conversion unit 11, a first detection unit 12, a second detection unit 13, an arithmetic unit 14, and a control unit 15. The power conversion unit 11 has an input terminal 111 and an output terminal 112. The power conversion unit 11 is coupled to at least one power-consuming element 16 of the projection device 1. The first detection unit 12 is coupled to the input terminal 111 of the power conversion unit 11 and is used to detect the voltage input to the input terminal 111 of the power conversion unit 11 to generate a first voltage detection value VD1. The second detection unit 13 is coupled to either the input terminal 111 or the output terminal 112 of the power conversion unit 11 and is used to detect the current at either the input terminal 111 or the output terminal 112 of the power conversion unit 11 to generate a current detection value ID. The arithmetic unit 14 is coupled to both the first detection unit 12 and the second detection unit 13. The arithmetic unit 14 calculates the total power consumption TP of at least one power-consuming element 16 based on the current detection value ID from the second detection unit 13, and outputs a first voltage detection value VD1 and the total power consumption value TP. The control unit 15 is coupled to both the arithmetic unit 14 and the at least one power-consuming element 16. The control unit 15 controls the power consumption of the at least one power-consuming element 16 based on the first voltage detection value VD1 and the total power consumption value TP from the arithmetic unit 14, thereby effectively controlling the operating power consumption of the projection device and achieving optimal brightness. The following will describe the first and second embodiments in detail.

[0019] like Figure 1 As shown, in the first embodiment of the present invention, the power conversion unit 11 can be an AC-DC converter. The input terminal 111 of the power conversion unit 11 is coupled to an external AC power supply 2, and the voltage received at the input terminal 111 of the power conversion unit 11 is the AC voltage V from the external AC power supply 2. AC The output terminal 112 of the power conversion unit 11 is coupled to at least one energy-consuming element 16. The power conversion unit 11 is used to convert the high-voltage AC voltage V AC Converted to the DC voltage V required for at least one power-consuming element 16 DC The DC voltage V is output from the output terminal 112 of the power conversion unit 11. DC At least one energy-consuming element 16.

[0020] In a first embodiment of the present invention, a second detection unit 13 is coupled to the input terminal 111 of a power conversion unit 11. The second detection unit 13 is used to detect the alternating current input to the input terminal 111 and generate a current detection value ID to an arithmetic unit 14. The arithmetic unit 14 is used to calculate the total power consumption TP of at least one power-consuming element 16 based on the first voltage detection value VD1 and the current detection value ID, and outputs the first voltage detection value VD1 and the total power consumption TP to a control unit 15. For example, the arithmetic unit 14 can multiply the first voltage detection value VD1 by the current detection value ID to calculate the total power consumption TP.

[0021] In a first embodiment of the present invention, the first detection unit 12 and the second detection unit 13 may be integrated into a single detection chip or a single detection module; alternatively, the first detection unit 12 and the second detection unit 13 may be a microcontroller (MCU) and an AC current meter, respectively. In one embodiment, the power conversion unit 11, the first detection unit 12, the second detection unit 13, and the arithmetic unit 14 may be integrated onto a low voltage power supply board.

[0022] like Figure 1 As shown, in the first embodiment of the present invention, the control unit 15 is used to determine the voltage (i.e., AC voltage V) input to the input terminal 111 of the power conversion unit 11 based on the first voltage detection value VD1. AC The voltage level is set to either low or high to determine the power (consumption) limit corresponding to the voltage operating conditions (low or high voltage level) of the projection device 1. The low voltage level has a corresponding first power threshold, and the high voltage level has a corresponding second power threshold. For example, the low voltage level and high voltage level could be 110 volts and 220 volts, respectively. The first power threshold could be less than the second power threshold, and the first and second power thresholds could be, for example, 1350 watts and 2470 watts, respectively. In the first embodiment of the present invention, the control unit 15 can be a microcontroller (MCU).

[0023] In a first embodiment of the present invention, the control unit 15 is configured to determine whether the current total power consumption TP of at least one power-consuming element 16 is greater than a first power threshold when the first voltage detection value VD1 corresponds to a low voltage level. When the control unit 15 determines that the total power consumption TP is greater than the first power threshold, the control unit 15 generates a control signal SC to the at least one power-consuming element 16 according to the ratio of the total power consumption TP to the first power threshold, so as to reduce the power consumption of the at least one power-consuming element 16, making the reduced total power consumption TP less than or equal to the first power threshold. When the control unit 15 determines that the current total power consumption TP is less than or equal to the first power threshold, the control unit 15 does not generate the control signal SC to reduce the power consumption to the at least one power-consuming element 16, so as to maintain the current operating power consumption of the projection device 1.

[0024] In a first embodiment of the present invention, the control unit 15 is configured to determine whether the current total power consumption TP of at least one power-consuming element 16 is greater than a second power threshold when the first voltage detection value VD1 corresponds to a high voltage level. When the control unit 15 determines that the total power consumption TP is greater than the second power threshold, the control unit 15 generates a control signal SC to the at least one power-consuming element 16 according to the ratio of the total power consumption TP to the second power threshold, so as to reduce the power consumption of the at least one power-consuming element 16, making the reduced total power consumption TP less than or equal to the second power threshold. When the control unit 15 determines that the current total power consumption TP is less than or equal to the second power threshold, the control unit 15 does not generate the control signal SC to reduce the power consumption to the at least one power-consuming element 16, so as to maintain the current operating power consumption of the projection device 1.

[0025] With this configuration, the control unit 15 can automatically reduce the power consumption of at least one power-consuming element 16 based on the first voltage detection value VD1 and the total power consumption value TP, so that the reduced total power consumption value TP is less than or equal to the first power threshold / the second power threshold, and the reduced total power consumption value TP is controlled between 90% and 100% of the first power threshold / the second power threshold. This not only effectively controls the operating power consumption of the projection device 1 and ensures that it meets the power consumption specifications, but also enables the projection device 1 to achieve optimal brightness.

[0026] In the first embodiment of the present invention, the number of at least one energy-consuming element 16 may be multiple, each energy-consuming element 16 having a corresponding power consumption value, and the sum of the power consumption values ​​corresponding to each energy-consuming element 16 is the aforementioned total power consumption value TP. The multiple energy-consuming elements 16 may include energy-consuming components such as a light source module, a heat dissipation module, and a drive module. For example, the light source module may include a light source, which may include at least one of a light-emitting diode and a laser diode; the heat dissipation module may include a fan; and the drive module may include a drive circuit board and a motor.

[0027] In a first embodiment of the present invention, the control unit 15 is configured to determine whether the total power consumption value TP is greater than a first power threshold when the first voltage detection value VD1 corresponds to a low voltage level; when the control unit 15 determines that the total power consumption value TP is greater than the first power threshold, the control unit 15 generates a control signal SC to at least one of the plurality of power-consuming elements 16 according to the total power consumption value TP and the first power threshold, so as to reduce the power consumption value of at least one of the plurality of power-consuming elements 16, so that the reduced total power consumption value TP is less than or equal to the first power threshold.

[0028] In a first embodiment of the present invention, the control unit 15 is configured to determine whether the total power consumption value TP is greater than a second power threshold when the first voltage detection value VD1 corresponds to a high voltage level; when the control unit 15 determines that the total power consumption value TP is greater than the second power threshold, the control unit 15 generates a control signal SC to at least one of the plurality of power-consuming elements 16 according to the total power consumption value TP and the second power threshold, so as to reduce the power consumption value of at least one of the plurality of power-consuming elements 16, so that the reduced total power consumption value TP is less than or equal to the second power threshold.

[0029] In one embodiment, when the control unit 15 determines that the current total power consumption TP is greater than a first power threshold / a second power threshold, the control unit 15 can generate a control signal SC by calculation. The control signal SC can be transmitted to one, more, or all of the multiple power-consuming elements 16. For example, when it is desired to reduce the power consumption of all the multiple power-consuming elements 16, the control unit 15 can obtain the required reduction in power consumption of all the multiple power-consuming elements 16 based on the ratio of the first power threshold / the second power threshold and the current total power consumption TP. For example, suppose the current total power consumption TP is 1408 watts and the first power threshold is 1350 watts. The control unit 15 knows that the required power consumption reduction is 58 watts. Based on the total required power consumption reduction (58 watts) and the current total power consumption TP (1408 watts), the control unit 15 calculates that the required reduction for all the multiple power-consuming components 16 is approximately 4% to 5% (that is, 95% to 96% of the current total power consumption TP). The control unit 15 generates a control signal SC corresponding to the above result and sends it to all the multiple power-consuming components 16. When it is necessary to reduce the power consumption of one or more (not all) of the multiple power-consuming components 16, the control unit 15 obtains the required reduction amount based on the required power consumption reduction (the difference between the first power threshold / second power threshold and the current total power consumption TP) and the proportion corresponding to the current power consumption of the power-consuming component 16 to be reduced. For example, in response to the first voltage detection value VD1 corresponding to a low voltage level, when it is desired to reduce the power consumption of the light source module among multiple power-consuming components 16, assuming the current total power consumption TP is 1590 watts, the current power consumption of the light source module is 1248 watts, and the first power threshold is 1350 watts, the control unit 15 can know that the required power consumption reduction is 240 watts, and the control unit 15 can calculate the required reduction of the light source module by approximately 20% (that is, 80% of the current power consumption of the light source module) based on the required total power consumption reduction (240 watts) and the current power consumption of the light source module (1248 watts). The control unit 15 generates a control signal SC corresponding to the above result to the light source module, so that the power consumption of the light source module after reduction is approximately 999 watts (reduction of approximately 249 watts), and the total power consumption after reduction TP (1590-249=1341 watts) is less than or equal to the first power threshold (1350 watts).

[0030] In one embodiment, when the control unit 15 determines that the current total power consumption value TP is greater than the first power threshold / the second power threshold, the control unit 15 can generate a corresponding control signal SC using a lookup table. The control signal SC can be transmitted to one, more, or all of the multiple power-consuming elements 16. For example, when it is desired to reduce the power consumption value of all the multiple power-consuming elements 16, the control unit 15 generates the control signal SC according to the lookup table. For example, in response to the first voltage detection value VD1 corresponding to a low voltage level, the first power threshold is 1350 watts, and the current total power consumption value TP is 1590 watts. The control unit 15 uses a lookup table to find the current power consumption value (or the corresponding current current value) of each power-consuming element 16 when the total power consumption value TP is 1590 watts. Furthermore, the control unit 15 uses the lookup table to find the power consumption value (or the corresponding current value) of each power-consuming element 16 that meets the condition that the adjusted total power consumption value TP is not greater than the first power threshold (1350 watts). Therefore, the control unit 15 can determine the magnitude of the power consumption value (or current value) reduction required for each power-consuming element 16 based on the lookup table result and generate a control signal SC. When it is necessary to reduce the power consumption value of one or more (not all) of a plurality of power-consuming elements 16, the control unit 15 can generate the control signal SC according to the lookup table. For example, when it is desired to reduce the power consumption of the light source module among multiple power-consuming components 16, and the control unit 15 determines that the current total power consumption TP (e.g., 1590 watts) is greater than a first power threshold (e.g., 1350 watts), the control unit 15 can determine that the required power consumption reduction is 240 watts, and based on the required power consumption reduction, it can look up the required reduction in the light source current (0.4 amperes) in a table. Please refer to [link / reference]. Figure 1 and Figure 3 As shown. Figure 3 Curve C1 illustrates the relationship between the pulse width modulation (PWM) parameters of the light source in the light source module and the current (amperes). Control unit 15, via... Figure 3 The relationship curve C1 shows that the current of the light source corresponding to the current PWM parameter (600) is about 2 amps. According to the table, the required reduction of the light source current (0.4 amps) is obtained. It is known that the current of the light source after adjustment is 1.6 amps. Thus, the PWM parameter of the light source after adjustment is 500. The control unit 15 generates a control signal SC corresponding to the above result (PWM parameter is 500) to the light source module, so that the total power consumption value TP after reduction is less than or equal to the first power threshold (1350 watts). In this way, the power consumption value of only one energy-consuming element 16 (light source module) is reduced and the power consumption specification is met.

[0031] For the second embodiment of the present invention, please refer to Figure 2As shown, its main technical content is similar to that of the first embodiment described above, with the same functions and advantages, which will not be repeated here. The only difference is that the second detection unit 13 in the second embodiment is coupled to the output terminal 112 of the power conversion unit 11. In the second embodiment of the present invention, the second detection unit 13 is used to detect the DC current output from the output terminal 112 and generate a current detection value ID to the arithmetic unit 14. In one embodiment, the arithmetic unit 14 is coupled to the output terminal 112 of the power conversion unit 11, and the arithmetic unit 14 is used to detect the DC voltage V output from the output terminal 112. DC The calculation unit 14 generates a second voltage detection value and calculates the total power consumption TP based on the second voltage detection value and the current detection value ID. For example, the calculation unit 14 can multiply the second voltage detection value and the current detection value ID, sum them, and then multiply by the conversion efficiency to calculate the total power consumption TP. The conversion efficiency is, for example, the conversion efficiency between the power input and output of the power conversion unit 11, and the error of the conversion efficiency may be, for example, between three percent and five percent.

[0032] In a second embodiment of the present invention, the second detection unit 13 may be, for example, a Hall-effect current sensor, and the arithmetic unit 14 may be, for example, a microcontroller (MCU).

[0033] In the second embodiment of the present invention, the DC voltage V DC The detection can also be performed by another microcontroller, which is coupled to the output terminal 112 of the arithmetic unit 14 and the power conversion unit 11 respectively. The other microcontroller transmits the second voltage detection value to the arithmetic unit 14, and the arithmetic unit 14 calculates the total power consumption value TP based on the second voltage detection value and the current detection value ID.

[0034] Please see Figure 4 As shown, in the second embodiment of the present invention, the power conversion unit 11 may also have multiple output terminals 112. The multiple output terminals 112 of the power conversion unit 11 are respectively coupled to multiple energy-consuming components 16 to output multiple DC voltages V at different voltage levels. DC Multiple power-consuming components 16 are connected. The number of second detection units 13 can be multiple, each second detection unit 13 being coupled to multiple output terminals 112 to detect multiple DC currents output from the multiple output terminals 112 and generate multiple current detection values ​​ID to the arithmetic unit 14. The arithmetic unit 14 is coupled to multiple output terminals 112 to detect multiple DC voltages V. DCThe power conversion unit 11 generates multiple second voltage detection values. The arithmetic unit 14 multiplies each current detection value ID by its corresponding second voltage detection value, sums the results, and then multiplies by the conversion efficiency to calculate the total power consumption TP. For example, the power conversion unit 11 may have three output terminals 112, which output three DC voltages V at voltage levels of 52 volts, 12.2 volts, and 5.1 volts, respectively. DC And three DC currents with current levels of 35 amps, 22 amps, and 5.1 amps. The number of second detection units 13 can correspond to the number of output terminals 112, and there can be three. The three second detection units 13 respectively detect the three DC currents from the three output terminals 112 to generate three current detection values ​​ID (35 amps, 22 amps, and 5.1 amps) to the arithmetic unit 14, and the arithmetic unit 14 detects the three DC voltages V from the three output terminals 112. DC The arithmetic unit 14 generates three second voltage detection values ​​(52 volts, 12.2 volts, and 5.1 volts). The arithmetic unit 14 multiplies the three current detection values ​​ID (35 amps, 22 amps, and 5.1 amps) by their corresponding three second voltage detection values ​​(52 volts, 12.2 volts, and 5.1 volts) respectively (35 amps * 52 volts = 1820 watts, 22 amps * 12.2 volts = 268.4 watts, 5.1 amps * 5.1 volts = 26.01 watts), sums them, and then multiplies by the conversion efficiency to calculate the total power consumption TP.

[0035] Figure 5 This is a control method for a projection device according to an embodiment of the present invention. For example, Figure 1 , Figure 2 The projection device 1 shown can be used to perform Figure 5 The control method for the projection device shown includes the following steps:

[0036] The first detection unit 12 detects the voltage input to the input terminal 111 of the power conversion unit 11 to generate a first voltage detection value VD1 to the arithmetic unit 14 (S1).

[0037] The second detection unit 13 detects the current at the input terminal 111 or the output terminal 112 of the power conversion unit 11 to generate a current detection value ID to the arithmetic unit 14 (S3).

[0038] The arithmetic unit 14 calculates the total power consumption value TP corresponding to at least one power-consuming element 16 based on the current detection value ID, and outputs the first voltage detection value VD1 and the total power consumption value TP to the control unit 15 (S5).

[0039] The control unit 15 controls the power consumption of at least one energy-consuming element 16 based on the first voltage detection value VD1 and the total power consumption value TP (S7).

[0040] Through the above steps, the arithmetic unit 14 calculates the total power consumption value TP corresponding to at least one power-consuming element 16 based on the current detection value ID. The control unit 15 then controls the power consumption of at least one power-consuming element 16 based on the first voltage detection value VD1 and the total power consumption value TP. This effectively controls the operating power consumption of the projection device, enabling the projection device to achieve optimal brightness.

[0041] In one embodiment of the present invention, when the second detection unit 13 is coupled to the input terminal 111 of the power conversion unit 11, after step S3, in which the second detection unit 13 detects the current at the input terminal 111 of the power conversion unit 11 to generate a current detection value ID, step S5, in which the arithmetic unit 14 calculates the total power consumption value TP corresponding to at least one power-consuming element 16 based on the current detection value ID, may further include: the arithmetic unit 14 calculating the total power consumption value TP corresponding to at least one power-consuming element 16 based on the first voltage detection value VD1 and the current detection value ID.

[0042] In another embodiment of the present invention, when the second detection unit 13 is coupled to the output terminal 112 of the power conversion unit 11, after step S3, in which the second detection unit 13 detects the current at the output terminal 112 of the power conversion unit 11 to generate a current detection value ID, the control method may further include the following step: the arithmetic unit 14 detects the voltage at the output terminal 112 of the power conversion unit 11 to generate a second voltage detection value. In this embodiment, step S5, in which the arithmetic unit 14 calculates the total power consumption value TP corresponding to at least one energy-consuming element 16 based on the current detection value ID, may further include: the arithmetic unit 14 calculating the total power consumption value TP corresponding to at least one energy-consuming element 16 based on the second voltage detection value and the current detection value ID.

[0043] Please see Figure 6 As shown, in one embodiment of the present invention, Figure 5 Step S7, whereby the control unit 15 controls the power consumption of at least one energy-consuming element 16 based on the first voltage detection value VD1 and the total power consumption value TP, may further include the following steps:

[0044] The control unit 15 determines whether the voltage input to the input terminal 111 of the power conversion unit 11 is a low voltage level or a high voltage level based on the first voltage detection value VD1 (S71).

[0045] If the first voltage detection value VD1 corresponds to a low voltage level, the control unit 15 determines whether the total power consumption value TP is greater than the first power threshold (S72). If the total power consumption value TP is greater than the first power threshold, the control unit 15 generates a control signal SC based on the total power consumption value TP and the first power threshold to reduce the power consumption of at least one power-consuming element 16 (S73). If the total power consumption value TP is less than or equal to the first power threshold, the control unit 15 does not generate the control signal SC to reduce the power consumption of at least one power-consuming element 16 (S74).

[0046] If the first voltage detection value VD1 corresponds to a high voltage level, the control unit 15 determines whether the total power consumption value TP is greater than the second power threshold (S75). If the total power consumption value TP is greater than the second power threshold, the control unit 15 generates a control signal SC based on the total power consumption value TP and the second power threshold to reduce the power consumption of at least one power-consuming element 16 (S76); if the total power consumption value TP is less than or equal to the second power threshold, the control unit 15 does not generate the control signal SC to reduce the power consumption of at least one power-consuming element 16 (S77).

[0047] In this embodiment, there may be multiple energy-consuming elements 16, each energy-consuming element 16 having a corresponding power consumption value, and the sum of the power consumption values ​​corresponding to each energy-consuming element 16 is the aforementioned total power consumption value TP. When the control unit 15 determines that the total power consumption value TP is greater than the first power threshold / the second power threshold, the control unit 15 generates a control signal SC to at least one of the multiple energy-consuming elements 16 to reduce the power consumption value of at least one of the multiple energy-consuming elements 16, so that the reduced total power consumption value TP is less than or equal to the first power threshold / the second power threshold.

[0048] In summary, the projection device and its control method according to the embodiments of the present invention have at least one of the following advantages: the arithmetic unit 14 receives a first voltage detection value VD1 from the first detection unit 12 and a current detection value ID from the second detection unit 13, and calculates the total power consumption value TP corresponding to at least one power-consuming element 16 based on the current detection value ID. Furthermore, the control unit 15 can automatically reduce the power consumption of at least one power-consuming element 16 based on the first voltage detection value VD1 and the total power consumption value TP, so that the reduced total power consumption value TP is less than or equal to the first power threshold / second power threshold. This not only effectively controls the operating power consumption of the projection device 1 and ensures that it meets the power consumption specifications, but also enables the projection device 1 to achieve optimal brightness.

[0049] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. Any simple equivalent variations and modifications made in accordance with the claims and description of the invention are still within the scope of this patent. Furthermore, no embodiment or claim of the present invention needs to achieve all the objectives, advantages, or features disclosed in the invention. In addition, the abstract and headings are merely for assisting in patent document searches and are not intended to limit the scope of the invention. Moreover, the terms "first," "second," etc., used in this specification or claims are only used to name elements or distinguish different embodiments or scopes, and are not intended to limit the upper or lower limit of the number of elements.

Claims

1. A projection device, characterized in that, The projection device includes: A power conversion unit coupled to at least one energy-consuming component; A first detection unit is coupled to the input terminal of the power conversion unit. The first detection unit is used to detect the voltage input to the power conversion unit to generate a first voltage detection value. The second detection unit is coupled to the input or output terminal of the power conversion unit. The second detection unit is used to detect the current at the input or output terminal of the power conversion unit to generate a current detection value. An arithmetic unit, coupled to both the first detection unit and the second detection unit, is used to calculate the total power consumption corresponding to the at least one power-consuming element based on the current detection value, and output the first voltage detection value and the total power consumption value; and A control unit is coupled to the arithmetic unit and the at least one power-consuming element, respectively, and the control unit is used to control the power consumption of the at least one power-consuming element according to the first voltage detection value and the sum of the power consumption values.

2. The projection device according to claim 1, characterized in that, The voltage received at the input terminal of the power conversion unit is an AC voltage, and the output terminal of the power conversion unit is coupled to the at least one energy-consuming element and outputs a DC voltage to the at least one energy-consuming element.

3. The projection device according to claim 2, characterized in that, The second detection unit is coupled to the input terminal of the power conversion unit, and the arithmetic unit is used to calculate the total power consumption value based on the first voltage detection value and the current detection value.

4. The projection device according to claim 3, characterized in that, The second detection unit includes an AC ammeter.

5. The projection device according to claim 2, characterized in that, The second detection unit and the arithmetic unit are respectively coupled to the output terminal of the power conversion unit. The arithmetic unit is used to detect the voltage at the output terminal of the power conversion unit to generate a second voltage detection value. The arithmetic unit is used to calculate the total power consumption value based on the second voltage detection value and the current detection value.

6. The projection device according to claim 5, characterized in that, The second detection unit includes a Hall effect current sensor.

7. The projection device according to claim 1, characterized in that, The control unit is used to determine whether the voltage input to the power conversion unit is a low voltage level or a high voltage level based on the first voltage detection value, wherein the low voltage level has a corresponding first power threshold and the high voltage level has a corresponding second power threshold.

8. The projection device according to claim 7, characterized in that, The control unit is configured to perform: In response to the first voltage detection value corresponding to the low voltage level, it is determined whether the total power consumption value is greater than the first power threshold. When the total power consumption value is greater than the first power threshold, a control signal is generated based on the total power consumption value and the first power threshold to reduce the power consumption of the at least one energy-consuming element. as well as In response to the first voltage detection value corresponding to the high voltage level, it is determined whether the total power consumption value is greater than the second power threshold. When the total power consumption value is greater than the second power threshold, the control signal is generated based on the total power consumption value and the second power threshold to reduce the power consumption of the at least one energy-consuming element.

9. The projection device according to claim 7, characterized in that, The number of the at least one energy-consuming element is multiple, each of the multiple energy-consuming elements has a corresponding power consumption value, and the sum of the power consumption values ​​corresponding to each of the multiple energy-consuming elements is the total power consumption value. The energy-consuming element includes a light source module, a heat dissipation module, and a driving module.

10. The projection device according to claim 9, characterized in that, The control unit is configured to perform: In response to the first voltage detection value corresponding to the low voltage level and the total power consumption value being greater than the first power threshold, a control signal is generated to reduce the power consumption value of at least one of the plurality of power-consuming elements so that the reduced total power consumption value is less than or equal to the first power threshold. as well as In response to the first voltage detection value corresponding to the high voltage level and the total power consumption value being greater than the second power threshold, the control signal is generated to reduce the power consumption value of at least one of the plurality of power-consuming elements so that the reduced total power consumption value is less than or equal to the second power threshold.

11. A control method for a projection device, characterized in that, The projection device includes a power conversion unit, a first detection unit, a second detection unit, a processing unit, and a control unit. The control method includes the following steps: The first detection unit detects the voltage input to the power conversion unit to generate a first voltage detection value; The second detection unit detects the current at the input or output terminal of the power conversion unit to generate a current detection value. The computing unit calculates the total power consumption of at least one energy-consuming element based on the current detection value, and outputs the first voltage detection value and the total power consumption value. as well as The control unit controls the power consumption of the at least one energy-consuming element based on the first voltage detection value and the sum of the power consumption values.

12. The control method for the projection device according to claim 11, characterized in that, The step of calculating the total power consumption corresponding to the at least one power-consuming element by the arithmetic unit based on the current detection value includes: The computing unit calculates the total power consumption corresponding to the at least one energy-consuming element based on the first voltage detection value and the current detection value.

13. The control method for the projection device according to claim 11, characterized in that, After the step of detecting the current at the output terminal of the power conversion unit by the second detection unit to generate the current detection value, the method further includes the following steps: The arithmetic unit detects the voltage at the output terminal of the power conversion unit to generate a second voltage detection value.

14. The control method for the projection device according to claim 13, characterized in that, The step of calculating the total power consumption corresponding to the at least one power-consuming element by the arithmetic unit based on the current detection value includes: The computing unit calculates the total power consumption corresponding to the at least one power-consuming element based on the second voltage detection value and the current detection value.

15. The control method for the projection device according to claim 11, characterized in that, The step of controlling the power consumption of the at least one energy-consuming element by the control unit based on the first voltage detection value and the total power consumption value includes: The control unit determines whether the voltage input to the power conversion unit is a low voltage level or a high voltage level based on the first voltage detection value. In response to the first voltage detection value corresponding to the low voltage level, the control unit determines whether the total power consumption value is greater than the first power threshold. If the total power consumption is greater than the first power threshold, the control unit generates a control signal based on the total power consumption and the first power threshold to reduce the power consumption of the at least one energy-consuming element; and In response to the first voltage detection value corresponding to the high voltage level, the control unit determines whether the total power consumption value is greater than the second power threshold. If the total power consumption is greater than the second power threshold, the control unit generates the control signal based on the total power consumption and the second power threshold to reduce the power consumption of the at least one energy-consuming element.

16. The control method for the projection device according to claim 11, characterized in that, The number of the at least one energy-consuming element is multiple, each of the multiple energy-consuming elements has a corresponding power consumption value, and the sum of the power consumption values ​​corresponding to each of the multiple energy-consuming elements is the total power consumption value. The step of controlling the power consumption of the at least one energy-consuming element by the control unit based on the first voltage detection value and the total power consumption value includes: The control unit determines whether the voltage input to the power conversion unit is a low voltage level or a high voltage level based on the first voltage detection value. In response to the first voltage detection value corresponding to the low voltage level, the control unit determines whether the total power consumption value is greater than the first power threshold. If the total power consumption is greater than the first power threshold, the control unit generates a control signal based on the total power consumption and the first power threshold to reduce the power consumption of at least one of the plurality of energy-consuming components, so that the reduced total power consumption is less than or equal to the first power threshold; and In response to the first voltage detection value corresponding to the high voltage level, the control unit determines whether the total power consumption value is greater than the second power threshold. If the total power consumption is greater than the second power threshold, the control unit generates the control signal based on the total power consumption and the second power threshold to reduce the power consumption of at least one of the plurality of power-consuming elements, so that the reduced total power consumption is less than or equal to the second power threshold.

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