JP2013135377A - Electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic apparatus capable of further reducing power consumption on standby.SOLUTION: An electronic apparatus comprises: a normal-time power supply circuit; a standby power supply circuit supplying a power to a circuit for starting the normal-time power supply circuit; and a startup circuit supplying a power to a circuit for starting the standby power supply circuit. The startup circuit has a power source supply part receiving external light by means of a photo-transistor switch, supplying a power to the standby power supply circuit, and not consuming a power when no external light is received.

Description

  The present invention relates to an electronic device that further suppresses power consumption by limiting external power supply by detecting external light.

  In recent years, there has been a demand for reduction of power consumption in electrical appliances, and it has become a challenge to reduce power consumption during standby, particularly in television receivers. This is because it is most effective to turn off the main power supply or unplug the power outlet in order to reduce power consumption to the utmost limit. This is because it is necessary to maintain the power supply to the remote control signal receiving circuit for provision. In view of this, a television receiver has been proposed for reducing power consumption during standby while maintaining an operation with a remote controller.

  The TV receiver detects the brightness of the room when the TV receiver is in a standby state, assuming that the TV receiver is in a standby state under the assumption that the TV receiver is rarely watched when the room is dark. The power supply to the remote control signal receiving circuit is maintained, and the power supply to the remote control signal receiving circuit is interrupted when a predetermined darkness is reached. Thereby, it is possible to further reduce power consumption during standby without impairing user convenience.

JP 2011-71902 A

  In Patent Document 1, control of power supply to the remote control signal receiving circuit is performed by a photodetection circuit and a television control microcomputer. A photodetection circuit using a photodiode, phototransistor, or solar cell detects external light and outputs a detection signal to the television control microcomputer. The television control microcomputer compares the value of the output detection signal with a predetermined threshold value, and cuts off the power supply to the remote control signal receiving circuit when the value is darker than the predetermined brightness. However, even when the power supply to the remote control signal receiving circuit is cut off, the power supply to the television control microcomputer is always maintained. Therefore, in order to further reduce power consumption, it is necessary to reduce power consumption in such a television control microcomputer.

  As means for solving the above problems, the following inventions and the like are provided. That is, as the first invention, the standby power supply circuit for supplying power to the circuit for starting up the normal power supply circuit and the normal power supply circuit and the circuit for starting up the standby power supply circuit The starter circuit includes a power supply unit that receives external light by a phototransistor switch, supplies power to the standby power supply circuit, and does not consume power when no external light is received. Provide electronic equipment.

  As a second aspect of the present invention, the normal power supply circuit supplies power of the start-up circuit to the standby power supply circuit even when the phototransistor switch does not receive external light after the normal power supply circuit is started up. An electronic apparatus according to the first aspect of the present invention has a power supply maintaining circuit for maintaining the power.

  As a third aspect of the invention, a management unit that manages an operation reservation that is a reservation for normal operation, and power is supplied to the standby power supply circuit when the operation reservation managed by the management unit is performed. An electronic device according to the first invention or the second invention, comprising: a reservation control unit that performs control as described above.

  According to the present invention, the standby power supply circuit is stopped by turning off the room lighting and the like, and it becomes possible to reduce power consumption in the same manner as when the main power supply is turned off or the outlet is disconnected.

FIG. 4 is a diagram illustrating an example of functional blocks of the electronic device according to the first embodiment. FIG. 3 is a diagram illustrating an example of a circuit configuration of the electronic device according to the first embodiment. 6 is a flowchart showing the operation of the electronic apparatus according to the first embodiment. FIG. 6 is a diagram illustrating an example of a circuit configuration of an electronic device according to a second embodiment. 7 is a flowchart showing the operation of the electronic device according to the second embodiment. FIG. 6 is a diagram illustrating an example of functional blocks of an electronic device according to a third embodiment.

  Embodiments of the present invention will be described below. In addition, this invention should not be limited to these embodiments at all, and can be implemented in various modes without departing from the gist thereof.

The first embodiment will mainly describe claim 1. The second embodiment will mainly describe claim 2. The third embodiment will mainly describe claim 3.
<Embodiment 1>
<Summary of Embodiment 1>

In the present embodiment, control of power supply to the standby power supply circuit is performed by an activation circuit including a phototransistor switch without using a microcomputer or the like. When the phototransistor switch receives external light, power is supplied to the standby power supply circuit. On the other hand, when the phototransistor switch does not receive light, no current flows in the starting circuit. Therefore, the power supply to the standby power supply circuit is cut off without turning off the main power supply or unplugging the power source by turning off the lighting of the room where the electronic device is placed at bedtime. Thereby, further reduction of power consumption is realized without bothering the user.
<Configuration of Embodiment 1>

  An example of functional blocks of the electronic device of this embodiment is shown in FIG. The electronic device 0100 includes a normal power supply circuit 0101, a standby power supply circuit 0102, and an activation circuit 0103. The activation circuit includes a power supply unit 0104.

  Here, the functional blocks of the apparatus may be realized as hardware, software, or both hardware and software. Specifically, if a computer is used, a CPU, a RAM, a bus, or an auxiliary storage device (a storage medium such as a nonvolatile memory or a memory card and a reader / writer of the medium), a display device, or other external device Examples include hardware components such as peripheral devices and I / O ports for external peripheral devices, driver programs and other application programs for controlling the hardware, and user interfaces used for information input.

  In addition, these hardware and software processes the programs developed on the RAM with the CPU, and processes, stores, and outputs data stored on the memory and hard disk, and data input via the interface. It is used for processing or controlling each hardware component. The present invention can be realized not only as an apparatus but also as a method. A part of the invention can be configured as software. Further, a software product used for causing a computer to execute such software, and a storage medium in which the product is fixed to a storage medium are naturally included in the technical scope of the present invention (the same applies throughout this specification). Is).

  The normal-time power supply circuit is a circuit for supplying power that is used to operate all the functions of the electronic device. The normal power supply circuit starts up by power supplied from a standby power supply circuit described later. That is, in a situation where power is not supplied from the standby power supply circuit, the normal power supply circuit is not energized and does not operate. The electronic device is embodied as, for example, a television receiver, a hard disk recorder, a personal computer, a mobile phone, a navigation device, an air conditioner or the like.

  The standby power supply circuit supplies power to a circuit for starting up the normal power supply circuit. The standby power supply circuit supplies power only to a limited circuit such as a remote control signal receiving circuit in a standby state (standby state) of the electronic device.

  The start-up circuit supplies power to a circuit for starting up the standby power supply circuit. The phototransistor switch receives external light, supplies power to the standby power supply circuit, and includes a power supply unit that does not consume power when external light is not received.

  FIG. 2 shows a specific example of the starting circuit. The start-up circuit 0200 is a circuit from the filter circuit and rectifier circuit 0202 connected to the commercial power source to the primary standby power supply circuit 0221 of the standby power supply circuit 0220, and is arranged on the filter circuit and rectifier circuit side. A power supply unit 0201 is arranged in parallel between the capacitor C1 0203 and the capacitor C3 0204 arranged on the primary standby power supply circuit side. The capacitors C1 and C2 are used for voltage smoothing to stabilize the output voltage.

  In the power supply unit, the phototransistor switch S1 0205 is arranged in series with the resistor R1 0206 and the resistor R2 0207, and the capacitor C2 0208 is connected in parallel with the resistor R2. The connection end of the resistor R2 and the capacitor C2 and the phototransistor switch S1 is connected to the base of the transistor T1 0209. The resistor R3 0211 and the resistor R4 0210 are connected in series with the transistor T1, and the MOS-FET F1 0212 is connected in parallel with the resistor R3.

  Next, the operation of the power supply unit will be described. When the phototransistor switch S1 receives light, a current flows through the resistors R1 and R2. When a voltage equal to or higher than the threshold voltage is applied to the resistor R2, the transistor T1 is turned on. Here, the capacitor C1 is disposed so as to have a time constant so that the start-up circuit does not become unstable due to a minute change in illuminance when the standby power supply circuit is started up. When the transistor T1 is turned on, a current flows through the transistor T1 and the resistors R3 and R4. When the voltage applied to the resistor R3 becomes equal to or higher than the threshold voltage, the voltage is output from the MOS-FET F1, and the primary power supply circuit Side and secondary side operate, and power is supplied to the load side.

  On the other hand, when the external light received by the phototransistor switch S1 falls below the threshold value, as in the case where the room illumination is turned off, the above operation is not performed and no voltage is output from the MOS-FET F1. In this way, when no external light is received, no current flows through the power supply unit, so that no power is supplied to the standby power supply circuit and no power is consumed.

  As described above, for example, when the user turns off the room when going to bed, the phototransistor switch S1 does not receive external light. As a result, power is not supplied to the standby power supply circuit, which is the same as when the main power supply is turned off or the outlet is disconnected. Note that the phototransistor switch S1 is preferably arranged in an electronic device so that it can receive external light such as room illumination. For example, in the case of a television receiver, it is easy to receive light from a lighting device provided on the ceiling by being provided above the cabinet.

FIG. 3 is a flowchart showing the operation of the start-up circuit described above. First, the phototransistor S1 receives light (step S0301). And it branches depending on whether the voltage concerning resistance R2 becomes more than a threshold value (step S0302). When the threshold value is exceeded, the transistor T1 is turned on, a voltage is output from the MOS-FET F1, and the standby power supply circuit operates (step S0303). On the other hand, if the threshold value is not exceeded, the standby power supply circuit does not operate.
<Embodiment 1 effect>

With the electronic device of this embodiment, the standby power supply circuit is stopped by turning off the room lighting and the like, and it becomes possible to reduce power consumption in the same manner as when the main power supply is turned off or the outlet is disconnected.
<Embodiment 2>
<Overview of Embodiment 2>

In the electronic device of this embodiment, after the normal-time power supply circuit starts up, the start-up circuit maintains power supply to the standby power supply circuit even when the phototransistor switch does not receive external light. . During operation by the normal power supply circuit, such as viewing, the phototransistor switch is a shadow of people and objects, so that it is possible to avoid such a situation that the operation stops unexpectedly and is stable. The operation can be maintained.
<Embodiment 2 configuration>

  The electronic apparatus according to the present embodiment is based on the first embodiment, and the normal power supply circuit is in a standby state even when the phototransistor switch does not receive external light after the normal power supply circuit starts up. A power supply maintaining circuit configured to maintain power supply of the activation circuit to the power supply circuit;

  FIG. 4 shows a specific example of the circuit configuration of an electronic device having a power supply maintaining circuit. The starting circuit and the like are the same as those in the first embodiment shown in FIG.

  The power supply maintaining circuit is arranged on the secondary side 0432 of the normal power supply circuit 0430. In the photocoupler P1 0433, the phototransistor side is connected to the transistor T1 0409, and the light emitting diode side is connected to the normal power supply circuit. A resistor R5 0434 is connected in parallel to the light emitting diode side, a Zener diode 0436 is connected to the cathode side of the light emitting diode, and a resistor R6 0435 is connected to the anode side.

  Next, the operation of the power supply maintaining circuit will be described. First, as described above, the standby power supply circuit is activated when the phototransistor switch receives external light. Then, the normal power supply circuit is started up by operating the remote control or the power switch. As a result, a current flows through the light emitting diode of the photocoupler P1 and the resistors R5 and R6 by the voltage output from the secondary side of the normal power supply circuit, and the phototransistor of the photocoupler P1 is turned on. With this operation, power supply to the standby power supply circuit is maintained regardless of whether the phototransistor switch S1 receives light.

  On the other hand, when the operation of the normal power supply circuit is stopped by the operation of the remote controller or the like, the operation of the power supply maintenance circuit is also stopped. Therefore, if the phototransistor switch S1 does not receive light under such circumstances, the operation is performed. As described in the first embodiment, the power supply to the standby power supply circuit is stopped.

  The power supply maintenance circuit, for example, turns off the TV receiver with the remote control when going to bed, turns off the room lighting, the power supply to the standby power supply circuit is also stopped, and it is equivalent without disconnecting the outlet Power consumption can be reduced. In addition, when a normal operation such as viewing is performed, even if the phototransistor switch S1 does not receive light, the power can be viewed stably without being cut off.

FIG. 5 is a flowchart showing the operation of the electronic apparatus of this embodiment. First, the phototransistor S1 receives light (step S0501). And it branches depending on whether the voltage concerning resistance R2 becomes more than a threshold value (step S0502). When the threshold value is exceeded, the transistor T1 is turned on, a voltage is output from the MOS-FET F1, and the standby power supply circuit operates (step S0503). On the other hand, if the threshold value is not exceeded, the standby power supply circuit does not operate. After the standby power supply circuit operates, the process branches depending on whether or not the normal power supply circuit has started up (step S0504). If it has risen, the photocoupler P1 is turned on, and the operation of the standby power supply circuit is maintained (step S0505). When the normal power supply circuit does not start up, the power supply to the standby power supply circuit is turned on or off depending on whether the phototransistor switch receives light.
<Embodiment 2 effect>

After the normal power supply circuit is started up by the electronic device of this embodiment, even when the phototransistor switch does not receive light, the power supply to the standby power supply circuit is maintained and the electronic device can be operated stably. Can do.
<Embodiment 3>
<Overview of Embodiment 3>

The present embodiment is an electronic device in which scheduled recording is executed by maintaining power supply to the standby power supply circuit even when the recording is performed in the middle of the night without receiving external light. It is.
<Embodiment 3 configuration>

  An example of functional blocks of the electronic device of this embodiment is shown in FIG. The electronic device 0600 includes a normal power supply circuit 0601, a standby power supply circuit 0602, a startup circuit 0603 having a power supply unit 0604, and further includes a management unit 0605 and a reservation control unit 0606. The electronic apparatus according to the present embodiment is based on the first or second embodiment, and the configuration other than the management unit and the reservation control unit has already been described, and thus a repeated description is omitted.

  The management unit has a function of managing an operation reservation, which is a reservation for normal operation. As an example of the operation reservation, in the case of a television receiver, there are a recording reservation and a viewing reservation. In addition, there is an operation start reservation in accordance with the wake-up time of the heater. The management unit manages such operation reservations by holding or updating.

  The reservation control unit controls the power supply to the standby power supply circuit when the operation reservation managed by the management unit is performed. With this configuration, the standby power supply circuit can supply power to the normal power supply circuit when an operation reservation is made, and the operation reservation is executed.

The management unit and the reservation control unit may be configured to maintain power supply until operation reservation is completed using a microcomputer driven by power supply from the standby power supply circuit, or commercial A standby power supply circuit may be started up when an operation reservation is made using a microcomputer or the like that is driven by a battery provided in the electronic device separately from the power source. In the latter case, power is not supplied to the standby power supply circuit until an operation reservation is made, so that it is possible to further reduce the consumption of commercial power.
<Embodiment 3 effects>

  The electronic device according to the present embodiment makes it possible to execute an operation reservation even when there is no outside light such as midnight.

0100 Electronic device 0101 Normal power supply circuit 0102 Standby power supply circuit 0103 Start-up circuit 0104 Power supply unit

Claims (3)

A standby power supply circuit for supplying power to a circuit for starting up the normal power supply circuit and the normal power supply circuit;
It consists of a startup circuit that supplies power to the circuit for starting up the standby power supply circuit,
The starter circuit is an electronic device including a power supply unit that receives external light by a phototransistor switch, supplies power to the standby power supply circuit, and does not consume power when the external light is not received. The normal power supply circuit is:
The power supply maintaining circuit for maintaining the power supply of the start-up circuit to the standby power supply circuit even when the phototransistor switch does not receive external light after the normal power supply circuit starts up. The electronic device as described in. A management unit that manages an operation reservation that is a reservation for normal operation;
3. The electronic device according to claim 1, further comprising: a reservation control unit configured to control power to be supplied to the standby power supply circuit when an operation reservation managed by the management unit is performed. .

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