JP2011135190A - Electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic device which supplies electric power suitable for respective programs, and prevents vainly wasting consumption power, the electronic device having: an output unit which outputs an image or a voice based on a received program signal; and a resonant type switching power supply which makes a switching element carry out a switching operation for electric power supply to the output unit. <P>SOLUTION: The electronic device controls a switching frequency of the switching element of the switching power device 9 for each program genre, and adjusts an electric power output from the switching power device 9. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electronic apparatus including an output unit that outputs an image or sound based on a received program signal, and a resonant switching power supply device that switches a switching element to supply power to the output unit.

  In the resonant switching power supply device, the switching element switches the output from the input DC power supply so that the resonant circuit including the primary winding and the capacitor of the transformer resonates, and from the secondary side of the transformer. It is configured to supply power.

  The resonant switching power supply device as described above performs a sinusoidal switching operation by causing either or both of a current waveform and a voltage waveform to resonate entirely or partially in a resonant circuit, The switching loss that occurs when the currents are turned on at the same time can be reduced, the rate of change in current per unit time can be reduced, and the amount of noise generated can be reduced.

  However, since the resonance frequency of the primary winding and the capacitor is high when the switching element is off, the switching element has a very high maximum voltage. Usually, the maximum voltage is 4 to 5 times the input voltage, so there is a problem that the voltage stress applied to the switching element becomes excessive.

  Patent Document 1 discloses a resonant switching power supply that can suppress the maximum voltage by reducing the resonance frequency when the switching element is off, thereby reducing the voltage stress applied to the switching element.

Japanese Utility Model Publication No. 5-48587

  On the other hand, for example, in a television receiver that receives and displays a broadcast signal including a digital broadcast, the required power consumption differs depending on the program to be displayed. For example, in the case of a movie program that requires a large volume due to powerful sound, the power consumption is higher than that of a news program that requires a medium and small volume.

  However, in the case of using the conventional resonant switching power supply as described above, the power supplied from the switching power supply is constant because the resonance frequency of the switching power supply is fixed. Power that can handle large programs is output. Therefore, when a program with low power consumption is shown, there is a problem that power consumption is wasted. Such a problem cannot be solved by the resonant switching power supply of Patent Document 1.

  The present invention has been made in view of such circumstances, and an object thereof is to receive means for receiving a program signal including program information and an output unit for outputting an image or sound based on the received program signal. And a resonant switching power supply device for switching the switching element to supply power to the output unit, and controlling the switching frequency of the switching element for each program genre, It is an object of the present invention to provide an electronic device that can supply power suitable for each program by adjusting the power supplied from the apparatus to the output unit and prevent wasteful consumption of power consumption.

  An electronic apparatus according to the present invention includes a receiving unit that receives a program signal including program information, an output unit that outputs an image or sound based on the received program signal, and a switching element that performs a switching operation. In an electronic device comprising a resonance type switching power supply device for supplying a genre, a genre detecting means for detecting a genre of a program from the program information, and a switching element of the switching element based on the genre of the program detected by the genre detecting means. And a switching control unit for controlling the frequency.

  In the present invention, the genre detection means detects the genre of the program from the program information included in the program signal received by the reception means. The switching control unit controls the switching frequency of the switching element based on the program genre detected by the genre detection means.

  In the electronic apparatus according to the present invention, the switching control unit includes a resonance capacitor that is connected to the switching element and that can change a capacity based on a genre of a program detected by the genre detection unit. Features.

  In the present invention, the capacity of the resonance capacitor provided in the switching control unit can be changed based on the genre of the program detected by the genre detection means. For example, when the genre of the program is news, the capacity of the resonance capacitor is increased, and when the genre of the program is a movie, the capacity of the resonance capacitor is decreased.

  In the electronic device according to the present invention, the resonance capacitor includes a plurality of capacitors, and connection means for selectively connecting the plurality of capacitors to the switching element based on a genre of a program detected by the genre detection means. It is characterized by having.

  In the present invention, based on the program genre detected by the genre detection means, the connection means selectively connects a plurality of capacitors included in the resonance capacitor to the switching element.

  In the electronic device according to the present invention, the resonance capacitor includes a plurality of capacitors having different capacities, and the plurality of capacitors are selectively connected to the switching element based on a genre of a program detected by the genre detection unit. Connection means is provided.

  In the present invention, based on the program genre detected by the genre detection means, the connection means selectively connects a plurality of capacitors having different capacities of the resonance capacitor to the switching element.

  The electronic apparatus according to the present invention includes a setting reception unit that receives the setting of the switching frequency for each genre of the program, and the switching control unit controls the switching frequency based on the setting received by the setting reception unit. It is comprised by these.

  In the present invention, the setting receiving unit receives, for example, a setting of the switching frequency for each program genre from a user, and the switching control unit performs switching based on the setting received by the setting receiving unit. Control the frequency.

  According to the present invention, by controlling the switching frequency of the switching element for each program genre and adjusting the power supplied from the switching power supply to the output unit, it is possible to supply power suitable for each program, It is possible to prevent wasteful consumption of power consumption.

FIG. 3 is a functional block diagram illustrating an exemplary main configuration of the television receiver according to the first embodiment. FIG. 3 is a functional block diagram illustrating an example of a main part configuration of a switching power supply device of the television receiver according to the first embodiment. FIG. 3 is an exemplary diagram illustrating a main part of a resonance circuit of the switching power supply device for the television receiver according to the first embodiment; 6 is an explanatory diagram for explaining the operation of the switching power supply device of the television receiver according to Embodiment 1. FIG. It is a conceptual diagram which shows notionally an example of the combination table which linked | related the genre of the program and the combination of the capacitor | condenser which should be connected to a switching element. FIG. 10 is a functional block diagram illustrating an exemplary main configuration of a television receiver according to a second embodiment. It is an illustration figure which shows an example of the frequency setting image which receives the setting of the frequency of switching for every genre of a program from a user.

(Embodiment 1)
Hereinafter, an electronic apparatus according to Embodiment 1 of the present invention will be described using a television receiver capable of receiving digital broadcasting as an example. FIG. 1 is a functional block diagram showing a configuration example of a main part of the television receiver 1 according to the first embodiment.

  The television receiver 1 according to Embodiment 1 includes a television antenna that receives a television signal (program signal) including a plurality of channels and program information of each channel, and the television received by the television antenna. The John signal is sent to the tuner unit 2. The tuner unit 2 selects a predetermined channel from the television signal received from the antenna according to an instruction from the control unit 7, and sends the signal of the predetermined channel to the signal processing unit 3.

  The signal processing unit 3 includes an IF circuit, an amplifier circuit, and the like, extracts an image signal from a signal of a predetermined channel sent from the tuner unit 2 and sends it out to the display unit 5 of the liquid crystal panel, for example. The signal processing unit 3 extracts an audio signal from the signal of the predetermined channel, performs processing such as volume adjustment and amplification, and outputs the processed signal to the audio output unit 4 of the speaker.

  In addition, the television receiver 1 includes a program information extraction unit 6, and the program information extraction unit 6 responds to an instruction from the control unit 7, by program name for each channel (or broadcast station), program genre, Broadcast data relating to program information such as the broadcast start time and broadcast end time of the program is extracted and sent to the control unit 7 and the signal processing unit 3. Based on the program information extracted by the program information extraction unit 6, the control unit 7 configures a so-called electronic program guide for accepting selection of a program to be displayed on the display unit 5 and displays it on the display unit 5. The signal processing unit 3 controls switching elements of a switching power supply device 9 to be described later based on broadcast data (program genre) from the program information extraction unit 6.

  The control unit 7 includes a CPU, a ROM, and a RAM (not shown). The CPU instructs the program information extraction unit 6 to extract program information, and instructs the tuner unit 2 to select a channel. The ROM stores a program for creating an electronic program guide displayed on the display unit 5. The RAM stores temporary data generated when the program is executed, for example, program information extracted by the program information extraction unit 6.

  The switching power supply device 9 includes a switching element (for example, an FET) that performs a switching operation at a predetermined frequency, and a resonance circuit having the switching element and a primary winding, and adjusts and converts input power, and a secondary winding. This is a so-called resonant switching power supply device that supplies power to each part of the television receiver 1 connected to the output side provided with.

  FIG. 2 is a functional block diagram showing an example of a configuration of a main part of the switching power supply 9 of the television receiver 1 according to the first embodiment. FIG. 3 is a switching power supply 9 of the television receiver 1 according to the first embodiment. It is an illustration figure which shows the principal part of this resonance circuit.

  The switching power supply device 9 includes a switching control unit 91 and a storage unit 95 that control the switching frequency of the switching element 94. In addition, the switching control unit 91 includes a resonance capacitor unit 93 (resonance capacitor) provided with a plurality of capacitors connected to the switching element 94, and switching for switching the connection between the capacitor of the capacitor unit 93 and the switching element 94. Part 92.

  The switching control unit 91 instructs the switching unit 92 to change the total capacity of the capacitor unit 93 by turning on and off the connection between the plurality of capacitors and the switching device 94 in the capacitor unit 93, thereby switching the switching element 94. Controls the switching frequency.

  The storage unit 95 stores a combination table in which a program genre to be output to the audio output unit 4 and the display unit 5 is associated with a combination of capacitors to be connected to the switching element 94 of the switching power supply device 9. The switching control unit 91 controls the switching frequency of the switching element 94 based on the combination table.

  Hereinafter, control of the switching frequency of the switching element 94 by the switching control unit 91 will be described in detail. For convenience of explanation, the capacitor unit 93 includes two capacitors C1 and C2 having the same capacity, the switching element 94 is an FET, and the switching unit 92 is an NPN transistor.

  Note that both terminals of the capacitor C1 are connected to the drain and source of the switching element 94, respectively. The capacitor C2 is connected in parallel with the capacitor C1 via the switching unit 92. One terminal of the capacitor C2 is connected to one terminal of the capacitor C1, the other terminal of the capacitor C2 is connected to the collector of the switching unit 92, and the emitter of the switching unit 92 is connected to the other terminal of the capacitor C1. ing. A signal from a genre determining unit 31 described later is received via the base of the switching unit 92.

  The drain of the switching element 94 (FET) is connected to the primary winding of the switching transformer, the source of the switching element 94 is connected to GND, and the gate of the switching element 94 is a switching that controls the switching circuit. It is connected to the control terminal of the control IC.

  The switching control unit 91 controls on / off of the switching unit 92 based on the determination result of the genre determination unit 31. For example, when the switching unit 92 is turned on, the total capacity of the capacitor unit 93 is the sum of the capacitor C1 and the capacitor C2. On the other hand, when the switching unit 92 is turned off, the total capacity of the capacitor unit 93 is determined by the capacity of the capacitor C1.

  Therefore, when the switching unit 92 is turned on, the total capacity of the capacitor unit 93 is increased and the switching frequency of the switching element 94 is reduced compared to when the switching unit 92 is turned off.

  When the switching element 94 (FET) is turned on, the so-called “on resistance RDS” has several hundreds mΩ, and a current (IDS) flows, thereby causing a loss. Therefore, as described above, when the switching frequency of the switching element 94 is reduced, the on / off frequency is reduced and the loss is also reduced, so that the power consumption in the switching element 94 can be reduced.

  The television receiver 1 according to the first embodiment can prevent wasteful power consumption by controlling the switching frequency of the switching element 94 based on the genre of the program to be shown as described above. I can do it. Hereinafter, the control of the switching frequency of the switching element 94 in the television receiver 1 of Embodiment 1 will be described in detail.

  FIG. 4 is an explanatory diagram for explaining the operation of the switching power supply device 9 of the television receiver 1 according to the first embodiment. FIG. 5 is a conceptual diagram conceptually showing an example of the combination table. For convenience of explanation, the operation of the switching power supply device 9 will be described by taking the case of audio output as an example. The switching control unit 91 controls the switching frequency of the switching element 94 based on the combination table as shown in FIG. 5, and the resonance circuit of the switching power supply device 9 has a configuration as shown in FIG. And

  The program information extraction unit 6 includes a program genre detection unit 61. The program genre detection unit 61 detects the genre of the program from the broadcast data related to the program information. Data relating to the genre of the program detected by the program genre detection unit 61 is sent to the genre determination unit 31 of the signal processing unit 3 using HDMI, and the genre determination unit 31 detects the program detected by the program genre detection unit 61. Determine the genre. Based on the determination result by the genre determination unit 31, the switching control unit 91 controls the switching frequency.

The signal processing unit 3 includes a genre determination unit 31, a volume / sound quality adjustment unit 32, and an amplification unit 33.
The genre determination unit 31 determines the genre of the program detected by the program genre detection unit 61 and sends a signal related to the determination result of the genre of the program to the switching power supply device 9. The switching power supply device 9 controls the output power based on the determination result of the genre of the program. That is, the switching control unit 91 of the switching power supply device 9 controls the switching frequency of the switching element 94 based on the program genre detected by the program genre detection unit 61, thereby increasing or decreasing the output power of the switching power supply device 9. .

  The volume / sound quality adjustment unit 32 adjusts the volume, sound quality, and the like related to the audio signal to be output to the audio output unit 4. In addition, the amplifying unit 33 performs amplification processing of the audio signal to be output to the audio output unit 4. The volume / sound quality adjustment unit 32 and the amplification unit 33 are supplied with power by the switching power supply device 9.

  For example, when the genre determination unit 31 determines that the genre of the program detected by the program genre detection unit 61 is “movie”, the switching control unit 91 of the switching power supply device 9 determines and stores the determination result by the genre determination unit 31. Based on the combination table stored in the unit 95, the switching unit 92 is instructed to switch the connection of the capacitor of the capacitor unit 93. That is, in the combination table, when the program genre is “movie”, the fact that only the capacitor C1 is connected to the switching element 94 is written, and the switching control unit 91 turns off the switching unit 92 (transistor). Thus, only the capacitor C1 is connected to the switching element 94. As a result, the total capacity of the capacitor section 93 becomes smaller than the total capacity when the capacitors C1 and C2 are connected to the switching element 94, and the switching frequency of the switching element 94 increases. Accordingly, since the power output from the switching power supply device 9 also increases, the power supplied to the volume / sound quality adjusting unit 32 and the amplifying unit 33 increases, so that a movie program can be enjoyed at a powerful volume level. I can do it.

  On the other hand, when the genre determination unit 31 determines that the genre of the program detected by the program genre detection unit 61 is “news”, the switching control unit 91 of the switching power supply device 9 determines and stores the determination result by the genre determination unit 31. Based on the combination table stored in the unit 95, the switching unit 92 is instructed to switch the connection of the capacitor of the capacitor unit 93. That is, in the combination table, when the genre of the program is “news”, the fact that the capacitors C1 and C2 are connected to the switching element 94 is written, and the switching control unit 91 turns on the switching unit 92. The capacitors C1 and C2 are connected to the switching element 94. As a result, the total capacity of the capacitor section 93 is larger than the total capacity when only the capacitor C1 is connected to the switching element 94, and the switching frequency of the switching element 94 is reduced. Therefore, power consumption in the switching element 94 itself can be reduced. At this time, the power output from the switching power supply 9 is also reduced, so that the power supplied to the volume / sound quality adjustment unit 32 and the amplification unit 33 is reduced. To avoid wasting output power in vain.

  In the above description, the case where the capacitor unit 93 includes two capacitors C1 and C2 having the same capacity has been described as an example. However, the present invention is not limited to this. For example, the capacitors C1 and C2 may be capacitors having different capacities, and the capacitor unit 93 may be configured to have two or more capacitors. What is necessary is just to comprise so that the total capacity | capacitance of the target capacitor | condenser part 93 can be obtained with the combination of each capacitor | condenser. A single capacitor whose capacity can be changed may be provided so as to obtain the target total capacity of the capacitor section 93.

(Embodiment 2)
The television receiver 1 according to the second embodiment is configured to be able to accept the setting of the switching frequency for each program genre from the user. FIG. 6 is a functional block diagram illustrating an exemplary configuration of a main part of the television receiver 1 according to the second embodiment.

  The control unit 7 of the television receiver 1 according to the second embodiment includes a setting reception unit 71. The setting reception unit 71 sets a switching frequency for each program genre from the user via the reception unit 8. Accept.

  The ROM (not shown) of the control unit 7 has a program for displaying an image (hereinafter referred to as a frequency setting image) for receiving the setting of the switching frequency of the switching element from the user on the display unit 5. I remember it.

  FIG. 7 is an exemplary diagram showing an example of the frequency setting image for accepting a switching frequency setting for each program genre from the user. The user can display the frequency setting image on the display unit 5 by appropriately operating the receiving unit 8 such as a remote control device or an operation panel, and can set a switching frequency for each program genre.

  For example, when the user operates the reception unit 8 to display the frequency setting image on the display unit 5 and sets the switching frequency for each genre of the program, the setting reception unit 71 of the control unit 7 is the reception unit. The switching frequency setting for each genre of the program is accepted via the program No. 8. At this time, the switching control unit 91 stores the setting of the accepted switching frequency in the storage unit 95, and controls on / off of the switching unit 92 based on the accepted setting instead of the combination table to perform switching. The switching frequency of the element 94 is controlled. That is, the total capacity of the capacitor unit 93 is adjusted by controlling on / off of the switching unit 92 so that the frequency is close to the switching frequency related to the setting.

  The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

1 Television receiver 2 Tuner section (reception means)
4. Audio output unit (output unit)
5 Display section (output section)
9 switching power supply 61 program genre detection unit (genre detection means)
71 Setting reception part (setting reception means)
91 switching control unit 92 switching unit (connection means)
93 Capacitor section (resonance capacitor)
94 Switching element 95 Storage unit C1, C2 Capacitor

Claims (5)

Receiving means for receiving a program signal including program information, an output unit for outputting an image or sound based on the received program signal, and a resonant switching power supply device for switching the switching element and supplying power to the output unit In an electronic device comprising:
Genre detection means for detecting the genre of the program from the program information;
An electronic apparatus comprising: a switching control unit that controls a switching frequency of the switching element based on a genre of a program detected by the genre detection unit. The switching controller is
The electronic apparatus according to claim 1, further comprising a resonance capacitor connected to the switching element and capable of changing a capacity based on a genre of a program detected by the genre detection unit. The resonant capacitor has a plurality of capacitors,
The electronic apparatus according to claim 2, further comprising a connection unit that selectively connects the plurality of capacitors to the switching element based on a program genre detected by the genre detection unit. The resonant capacitor has a plurality of capacitors having different capacities,
The electronic apparatus according to claim 2, further comprising a connection unit that selectively connects the plurality of capacitors to the switching element based on a program genre detected by the genre detection unit. Comprising setting accepting means for accepting the setting of the switching frequency for each program genre;
The electronic device according to claim 1, wherein the switching control unit is configured to control a switching frequency based on a setting received by the setting receiving unit.

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