JP2009153267A - System, apparatus and method for controlling power supply - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system, apparatus and method for controlling power supply, capable of controlling power supply to an electronic apparatus. <P>SOLUTION: This apparatus for controlling power supply is connected with an electronic apparatus and detects power consumption of the electronic apparatus during power supply to the electronic apparatus. The apparatus for controlling power supply, when the detected power consumption is larger than a predetermined threshold power, maintains power supply to the electronic apparatus. On the other hand, when the detected power consumption is larger than a predetermined threshold power, the apparatus for controlling power supply shuts down power supply to the electronic apparatus. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a power supply control system that controls supply of power.

  Electronic devices such as projectors have a function of turning the power on or off. This electronic device is connected to an AC (Alternating Current) power source, and when the power button is pressed by the user, the electronic device receives power from the AC power source and turns on the power source. In addition, when the user presses the power button, the activated electronic device turns off the power and cuts off the supply of power from the AC power source.

  In general, this type of electronic device has a standby mode function in addition to a function of turning the power on or off. The standby mode is a mode in which the electronic device can be started immediately while suppressing power consumption. The standby mode provided in the projector will be described as an example of the standby mode. In the case of a projector, when a main power switch provided in the projector is turned on, the projector enters a standby mode and waits for immediate activation. As another example of the standby mode, a standby mode provided in a personal computer (hereinafter referred to as “PC”) will be described. In the case of a PC, when the standby mode is selected by the user when the PC is turned on, the CPU (Central Processing Unit) mounted on the PC temporarily holds the operating state in the memory and holds it in the memory. Wait so that the operating state can be activated immediately.

When the electronic device having the standby mode function is set to the standby mode, the electronic device receives a small amount of power from the AC power source while suppressing power consumption and waits for immediate activation. According to the electronic device disclosed in Japanese Patent Laid-Open No. 2004-133106, this small amount of power is used for operating a power supply circuit, a CPU, and the like.
JP 2004-133106 A

  As described above, when the electronic device is in the off state, the power supply line from the AC power source is cut off, so that power is not supplied from the AC power source to the electronic device.

  On the other hand, in the standby mode, the power line from the AC power source is not cut off, and power is supplied from the AC power source to the electronic device.

  When the power-off state is compared with the standby mode, power is consumed in the standby mode. Therefore, it is preferable that the power source of the electronic device is off from the viewpoint of energy saving.

  Therefore, there is a need for a power supply control system that can perform control for cutting off the supply of power from an AC power source to an electronic device not only when the power source of the electronic device is off but also in a standby mode. .

  An object of the present invention is to provide a power supply control system, a power supply control device, and a power supply control method capable of controlling the supply of power to an electronic device.

In order to achieve the above object, the power supply control system of the present invention includes:
A power supply control system having an electronic device and a power supply control device that controls supply of power to the electronic device,
The power supply control device detects power consumption of the electronic device during supply of power to the electronic device, and when the detected power consumption detected is larger than a predetermined threshold power, the electronic device If the detected power consumption is smaller than the threshold power, the supply of power to the electronic device is cut off.

The power supply control device of the present invention
A power supply control device for controlling power supply to an electronic device,
The power consumption of the electronic device is detected during the supply of power to the electronic device, and when the detected power consumption detected is greater than a predetermined threshold power, the power supply to the electronic device is maintained. When the detected power consumption is smaller than a predetermined threshold power, a power control unit for cutting off the supply of power to the electronic device is provided.

Moreover, the power supply control method of the present invention includes:
A power supply control system comprising: an electronic device; and a power supply control device that controls supply of power to the electronic device. Power supply for controlling power supply from the power supply control device to the electronic device. A control method,
During power supply from the power supply control device to the electronic device, the power supply control device detects the power consumption of the electronic device, and the detected power consumption is determined from a predetermined threshold power. When the power consumption is larger, power supply from the power supply control device to the electronic device is maintained, and when the detected power consumption is smaller than the threshold power, power from the power supply control device to the electronic device is maintained. Shut off the supply.

  According to the present invention, since power is not consumed even in the standby mode, the power consumed by the electronic device can be further reduced.

  Embodiments for carrying out the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a power supply control system in the present embodiment. The power supply control system includes a power supply control device 1 and an electronic device 2.

  The power supply control device 1 is connected to an AC power source (not shown) via a power cord 3, and is connected to the electronic device 2 via a power cord 4. The electronic device 2 is connected to the power supply control device 1.

  The outline of the present embodiment will be described. The power supply control device 1 is connected to the electronic device 2 and detects the power consumption of the electronic device 2 during the supply of power to the electronic device 2. When the detected power consumption (hereinafter referred to as “detected power consumption”) is greater than the power consumption that is a predetermined threshold (hereinafter referred to as “threshold power”), The supply of power to the electronic device 2 is maintained. The power supply control device 1 cuts off the supply of power to the electronic device 2 when the detected power consumption is smaller than a predetermined threshold power.

  According to this, the power supply control device 1 supplies power to the electronic device 2 in a state where the power consumption is large (for example, a state where the power of the electronic device 2 is on), and a state where the power consumption is small (for example, the electronic In the state where the power of the device 2 is off or in the standby mode), the power supply to the electronic device 2 is cut off. Thereby, since power is not consumed even in the standby mode, the power consumed by the electronic device 2 can be further reduced.

  Hereinafter, the power supply control device 1 and the electronic device 2 constituting the power supply cutoff system will be described in detail.

  The power supply control device 1 has a power control function, and controls the supply of power from the AC power source to the electronic device 2 by this power control function. The power cutoff function is a function for controlling the supply of power from the AC power source to the electronic device 2. For example, the power supply control device 1 detects power consumption supplied from the AC power source to the electronic device 2 and controls the power supply to the electronic device 2 according to the detected power consumption.

  Specifically, the power supply control device 1 stores standby power consumption in advance. The standby power consumption is power consumption in the standby mode smaller than the threshold power. When detecting the power consumption of the electronic device 2, the power supply control device 1 measures the difference between the detected power consumption and the standby mode power consumption. And the electric power supply control apparatus 1 interrupts | blocks supply of the electric power to the electronic device 2, when the measured difference is below a fixed value. The power supply control device 1 continues to supply power to the electronic device 2 when the measured difference is greater than a certain value. According to this, even when an error occurs in the detected power consumption near the standby power consumption, the power supply from the power supply control device 1 to the electronic device 2 is interrupted.

  The electronic device 2 is an electronic device having a standby mode, for example, a projector device. The electronic device 2 includes a light source (not shown) for projecting an image on a projection surface, a main power switch (not shown) that controls the supply of power from an AC power source, and a power button (not shown) that turns the power on or off. ), And an AC input unit (not shown) for receiving power supply.

  The electronic device 2 performs either of power supply or power cut-off processing by switching the main power switch on and off. When the main power switch of the electronic device 2 is switched from OFF to ON, the electronic device 2 is supplied with power from the AC power supply and enters a standby mode. On the other hand, when the main power switch of the electronic device 2 is switched from on to off, the power is turned off to cut off the power supply.

  In addition, when the electronic device 2 detects that the power button is pressed while power is supplied from the AC power supply, the electronic device 2 performs either a start-up or a switch to the standby mode. Specifically, when the electronic device 2 detects pressing of the power button in the standby mode, the electronic device 2 starts to be activated and the electronic device 2 is turned on. When the electronic device 2 detects that the power button is pressed in the on state, the electronic device 2 switches from the on state to the standby mode. When the electronic device 2 is switched from the on state to the standby mode, the power supply is interrupted by the power cutoff function provided in the power supply control device 1.

  The electronic device 2 has an auto start function. The auto-start function is a function that automatically starts when power is supplied from the AC power source to the electronic device 2 without pressing the power button of the electronic device 2. For example, when the supply of power to the electronic device 2 having an auto-start function is started, the electronic device 2 is automatically activated and an image is projected by the electronic device 2. According to this, it becomes unnecessary to press the power button provided in the electronic device 2.

  FIG. 2 is a block diagram showing a configuration of the power supply control device 1 in the present embodiment. The power supply control device 1 includes an AC input unit 11, a power control unit 50, an AC output unit 13, a power supply switch 21, and a power cutoff switch 22.

  One end of the AC input unit 11 is connected to the current source, and the other end is connected to the power cutoff switch 22. The other end of the power cutoff switch 22 is connected to the AC output unit 13 via the power supply switch 21 and the power control unit 50 connected in parallel.

  The power supply switch 21 is a switch for supplying power to the electronic device 2. The power supply switch 21 is normally open and is in a non-conductive state, but can be closed to be in a conductive state only while being pressed by the user. When the power supply switch 21 is turned on, an alternating current from the AC input unit 11 flows to the power control unit 50 and the electronic device 2 via the power supply switch 21.

  The power control unit 50 detects the power consumption of the electronic device 2 while the power is being supplied to the electronic device 2, and when the detected power consumption is larger than a predetermined threshold power, the power control unit 50 When the supply of power is maintained and the detected power consumption is smaller than a predetermined threshold power, the supply of power to the electronic device 2 is cut off. In order to execute these series of processes, the power control unit 50 includes a latch relay 12, an AC / DC conversion unit 31, a power detection unit 32, and a switching unit 33. The latch relay 12, the AC / DC conversion unit 31, the power detection unit 32, and the switching unit 33 constituting the power control unit 50 will be described in detail.

  The latch relay 12 and the power supply switch 21 are connected in parallel between the AC input unit 11 and the AC output unit 13. The power detection unit 32 is connected to the wiring between the AC input unit 11 and the AC output unit 13, and is connected to the AC / DC conversion unit 31 and the latch relay 12 via the switching unit 33. The AC / DC conversion unit 31 is connected to the wiring between the AC input unit 11 and the AC output unit 13, and is also connected to the latch relay 12.

  The AC / DC converter 31 converts an alternating current from an AC power source via the power supply switch 21 into a direct current, and outputs the direct current to the latch relay 12. Specifically, the AC / DC converter 31 converts a 100V AC voltage from the AC power source into a 12V DC voltage, and applies the 12V DC voltage to the latch relay 12 to thereby convert the DC current into the latch relay 12. Shed.

  The latch relay 12 has a self-holding function, and the power supply to the electronic device 2 is controlled by the self-holding function. The self-holding function is a function for holding a switched state by switching a switch in the latch relay to either on or off when a current flows into the latch relay.

  Here, the self-holding function will be described in detail. The latch relay 12 includes coils 40 and 41 and a switch 42. The switch 42 is normally open and becomes non-conductive. In general, a coil is difficult to pass an alternating current but has a property of easily passing a direct current. Therefore, the AC / DC conversion unit 31 converts the alternating current into a direct current. When a direct current flows from the AC / DC converter 31 to the coil 41, a magnetic force is generated in the coil 41. By receiving this magnetic force, the switch 42 closes and becomes conductive, and an alternating current can be supplied to the electronic device 2. When the switch 42 becomes conductive, a direct current continues to flow to the coil 41 by the switch 42 and the AC / DC converter 31, so that the switch 42 can maintain the conductive state by the magnetic force generated from the coil 41. Thus, an alternating current can be supplied to the electronic device 2 via the power supply switch 21 without continuing to press the power supply switch 21. On the other hand, when a direct current flows from the AC / DC conversion unit 31 to the coil 40 wound in the opposite direction to the coil 41 via the switching unit 33, the magnetic force applied to the switch 42 is reduced, and the switch 42 is opened and not turned on. It becomes a conductive state. As a result, the supply of alternating current to the electronic device 2 is interrupted.

  The switching unit 33 is a switch for switching the supply or interruption of the direct current to the coil 40. The switching unit 33 is normally opened to be in a non-conducting state. However, when the signal from the power detection unit 32 is detected, the switching unit 33 is closed to be in a conducting state. When the switching unit 33 becomes conductive, a direct current flows through the coil 40 via the switching unit 33.

  The power detection unit 32 detects the power consumption of the electronic device 2 based on the alternating current flowing through the electronic device 2. The power detection unit 32 maintains the supply of power to the electronic device 2 when the detected power consumption is greater than the threshold, and supplies the power to the electronic device 2 when the detected power consumption is less than the threshold power. Cut off.

  For example, the power detection unit 32 stores standby power consumption in advance, and measures the difference between the detected power consumption of the electronic device 2 and the standby power consumption. If the measured difference is equal to or less than a certain value, the power detection unit 32 sends a signal to the switching unit 33 to instruct the switching unit 33 to close and enter a conductive state. When the switching unit 33 is turned on according to an instruction from the power detection unit 32, a direct current flows through the coil 40, and the switch 42 is turned off by the magnetic force generated in the coil 40. Thereby, the supply of electric power from the AC power source to the electronic device 2 is interrupted.

  The power cutoff switch 22 is a switch for causing the electronic device 2 to immediately cut off the supply of power. Normally, the power cut-off switch 22 is conductive, but when it is pressed by the user, the power cut-off switch 22 becomes non-conductive and the power supply to the electronic device 2 is cut off.

  FIG. 3 is a flowchart showing the operation of the power consumption suppression system in this embodiment.

  When the power supply switch 21 is pressed by the user, the power supply switch 21 becomes conductive, and the alternating current supplied from the AC input unit 11 flows into the AC / DC conversion unit 31 (step 100). The AC / DC conversion unit 31 converts the alternating current from the AC input unit 11 into a direct current and outputs the direct current to the latch relay 12 (step 101). When receiving the direct current from the AC / DC converter 31, the latch relay 12 generates a magnetic force to the switch 42 to turn on the switch 42 (step 102). Thereafter, an alternating current from an AC power supply is supplied to the electronic device 2 via the switch 42 (step 103).

  When an alternating current is supplied from the power supply control device 1 to the electronic device 2, the power detection unit 32 of the power supply control device 1 measures the difference between the detected power consumption and the standby power consumption (step 104). If the measured difference is larger than a certain value, the switch 42 is kept on by the self-holding function of the latch relay 12, and an alternating current continues to be supplied to the electronic device 2 via the switch 42 and the AC output unit 13 ( Step 105). When the electronic device 2 is supplied with an alternating current from the power supply control device 1 when not in use such as in a standby mode, the electronic device 2 automatically starts and starts projecting an image on the projection surface (step 106).

  If the detected difference in step 104 is less than or equal to a certain value, the power detection unit 32 sends a signal to the switching unit 33 to place the switching unit 33 in a conductive state (step 107). Then, the switch 42 is turned off, and the supply of power to the electronic device 2 is interrupted (step 108).

  As described above, according to the present embodiment, the power supply control device 1 supplies power to the electronic device 2 when the power consumption of the electronic device 2 is large, and electronically when the power consumption of the electronic device 2 is small. The power supply to the device 2 is cut off. Thereby, since electric power is not consumed by the electronic device 2 even in the standby mode, the electric power consumed by the electronic device 2 can be further reduced.

  Some electronic devices do not require cooling after use or do not require an AC power supply for cooling. When the power cut-off supply device 1 is connected to such an electronic device 2, the power supply control device 1 immediately cuts off the power consumption to the electronic device 2 when detecting the pressing of the power cut-off switch 22. Also good.

  In this embodiment, the standby mode provided in the projector is used. However, the present invention can be applied to any electronic device such as a personal computer having a standby mode function.

  In this embodiment, an example in which a projector having an auto-on function is used has been described. However, the present invention can be applied to any electronic device having an auto-on function.

  In the present embodiment, the power control unit is mounted on the power supply control device. However, the present invention is not limited to this. As another example, a power control unit such as a power detection unit, a latch relay, or an AC / DC conversion unit may be built in the electronic device. In this case, the power control unit is connected to a consuming unit that consumes power, such as a CPU or a memory, and detects the power consumption of the consuming unit while supplying power to the consuming unit. The power control unit maintains supply of power to the consumption unit when the detected power consumption is greater than a predetermined threshold power. The power control unit cuts off the power supply to the electronic device when the detected power consumption is smaller than a predetermined threshold power.

  In addition to the built-in power detection unit that detects the difference in power consumption in the electronic device, a fan stop detection unit that detects the stop of the cooling fan and a measurement unit that measures a predetermined time after the electronic device stops. It may be built in. In this case, when the stop of the cooling fan is detected by the fan stop detection unit or when a predetermined time has elapsed in the measurement unit, the switch in the latch relay is cut off.

It is a block diagram which shows the structure of the electric power supply control system in this embodiment. It is a block diagram which shows the structure of the electric power supply control apparatus 1 in this embodiment. It is a flowchart which shows operation | movement of the electric power supply control system in this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power supply control apparatus 2 Electronic device 11 AC input part 12 Latch relay 13 AC output part 21 Power supply switch 22 Power cutoff switch 31 AC / DC conversion part 32 Power detection part 33 Switching part 40, 41 Coil 42 Switch 50 Power control part 100-108 steps

Claims (12)

A power supply control system having an electronic device and a power supply control device that controls supply of power to the electronic device,
The power supply control device detects power consumption of the electronic device during supply of power to the electronic device, and when the detected power consumption detected is larger than a predetermined threshold power, the electronic device A power supply control system that maintains the supply of power to the electronic device and cuts off the supply of power to the electronic device when the detected power consumption is smaller than the threshold power. The power supply control system according to claim 1,
The electronic device is capable of setting a standby mode for standby so that the electronic device can be immediately activated while suppressing power consumption in the device itself, and a power supply control system in which power consumption in the standby mode is smaller than the threshold power . The power supply control system according to claim 2,
The power supply control device stores in advance standby power consumption that is power consumption when the electronic device is in a standby mode, and if the difference between the detected power consumption and the standby power consumption is equal to or less than a certain value, A power supply control system for cutting off power supply to the electronic device. The power supply control system according to any one of claims 1 to 3,
The power supply control device includes a relay provided between a current source and the electronic device. When the detected power consumption is larger than the threshold power, the electronic device is turned on by bringing the relay into a conductive state. An electric power supply cutoff system that supplies electric power to the electronic device and cuts off the supply of electric power to the electronic device by setting the relay to a non-conductive state when the detected power consumption is smaller than the threshold power. The power supply control system according to any one of claims 2 to 4,
The power supply control apparatus includes a switch, and supplies power to the electronic device regardless of a state of the electronic device when an input to the switch is detected. The power supply control system according to claim 5,
The electronic device is a power supply control system that automatically starts when power is supplied from the power supply control device when power is not supplied or in a standby mode. The power supply control system according to any one of claims 1 to 6,
The power supply control system, wherein the electronic device is a projector. A power supply control device for controlling power supply to an electronic device,
The power consumption of the electronic device is detected during the supply of power to the electronic device, and when the detected power consumption detected is greater than a predetermined threshold power, the power supply to the electronic device is maintained. A power supply control device having a power control unit that cuts off the supply of power to the electronic device when the detected power consumption is smaller than a predetermined threshold power. The power supply control device according to claim 8,
The power control unit stores a predetermined second threshold power in advance, and if the difference between the detected power consumption and the second threshold power is a predetermined value or less, the electronic control unit A power supply control device that cuts off the supply of power to equipment. The power supply control device according to claim 8 or 9,
The power supply control device further includes a switch connected to the power control unit,
The power control unit is configured to supply power to the electronic device regardless of the state of the electronic device when detecting an input to the switch. The power supply control device according to any one of claims 8 to 10,
The power control unit includes a relay provided between a current source and the electronic device and a power detection unit connected to the relay,
The power detection unit
When the power consumption of the electronic device is detected and the detected power consumption is greater than the threshold power, the relay is set in a conductive state in which power is supplied to the electronic device, and the detected power consumption is A power supply control device that sets the relay to a non-conduction state, which is a state that interrupts the supply of power to the electronic device, when the power is smaller than a threshold power. A power supply control system comprising: an electronic device; and a power supply control device that controls supply of power to the electronic device. Power supply for controlling power supply from the power supply control device to the electronic device. A control method,
During power supply from the power supply control device to the electronic device, the power supply control device detects the power consumption of the electronic device, and the detected power consumption is determined from a predetermined threshold power. When the power consumption is larger, power supply from the power supply control device to the electronic device is maintained, and when the detected power consumption is smaller than the threshold power, power from the power supply control device to the electronic device is maintained. Power supply control method for cutting off the supply of power.

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