JP3101962U - Power saving device for display and display using the same - Google Patents

Abstract

There is no wasteful use of power consumption when a power supply of a display is off.
An AC / DC converter, a voltage regulator, a delay circuit, and, when the voltage of the current from the delay circuit is at a first level, allowing the current to pass to operate the voltage regulator. When the voltage of the current is at the second level, the control means does not pass the current and does not operate the voltage regulator; And an electronic switch that outputs a trigger signal to the processor when pressed, when it is depressed. When the electronic switch is pressed while the power of the display is on, a trigger signal is output to the processor to release the maintenance, and the voltage of the first level is converted to the second level. When the power of the display is turned off and the electronic switch is pressed again, the voltage of the second level is returned to the first level, and the trigger signal is output to the processor to output the first signal. The level voltage is maintained and the display is turned on.
[Selection diagram] FIG.

Description

  The present invention relates to a power saving device for a display and a display using the same.

  As shown in FIG. 1, a conventional power supply device for a display includes an AC / DC converter 11 that converts external AC power of, for example, 110 V or 220 V into DC power of 12 V, for example. A voltage regulator 12 that regulates 12 V DC power to, for example, 5 V DC power, and receives 5 V DC power from the voltage regulator 12 and outputs the 5 V DC power to a peripheral device 14 such as a display card. And a micro processor (microprocessor) 13 for controlling. A mechanical switch 15 is provided between the AC / DC converter 11 and the voltage regulator 12. By pressing the mechanical switch 15, the conduction between the AC / DC converter 11 and the voltage regulator 12 is determined, that is, whether the power supply of the display is on or off. Can be controlled.

  However, when the mechanical switch conducts between the AC / DC converter 11 and the voltage regulator 12, not only is it easy to generate a spark due to the instantaneous input of a large current, but also after the contact has been used for a long time, At present, electronic switches are often used in place of mechanical switches because they are oxidized to cause poor contact.

  FIG. 2 shows an example of a display power supply device using an electronic switch. In this example, the electronic switch 16 is in communication with the microprocessor 13. When the electronic switch 16 is pressed, a trigger signal is output to the micro-processor 13, and the power supply to the peripheral device 14 is switched under the control of the micro-processor 13. That is, when the electronic switch 16 is pressed while the power of the display is on and the power is supplied to the peripheral device 14, the micro processor 13 causes the peripheral device 14 to operate based on the trigger signal. When the power supply to the peripheral device 14 is turned off by turning off the power supply to the display and the electronic switch 16 is pressed again, the micro processor 13 sends a signal to the peripheral device 14 based on the trigger signal. The power supply is restored and the power of the display is turned on.

  The power supply device using such an electronic switch is capable of holding the power supply to the microprocessor 13 at any time in order to receive a trigger signal even when the power of the display is off. Power consumption is wasted.

  In addition, when the power is restored after the power is interrupted (power failure), the electronic switch does not have the function to store the power status unlike the mechanical switch. For example, even if the power is restored thereafter, there is a problem that the electronic device itself cannot be returned to the ON state, and it is necessary to press the electronic switch again to restore the power supply of the display to the ON state.

  In view of the above, the present invention uses a power saving device for a display, which does not waste use of the power consumption when an electronic switch is used, but the power of the display is off. It is a first object to provide a display.

  Further, it is an object of the present invention to provide a power saving device for a display and a display using the same, in which the power state of the display can be automatically restored to a state before the power interruption after the power is suddenly interrupted and then restored. As a second problem.

  In order to achieve the object, the inventor firstly operates an AC / DC converter that converts external AC power into DC power and outputs the DC power, and receives the DC power from the AC / DC converter. A voltage regulator that regulates and outputs the voltage of the DC power, a delay circuit connected between the AC / DC converter and the voltage regulator, and a delay circuit between the delay circuit and the voltage regulator. Provided, when the voltage of the current from the delay circuit is at a first level, passes the current to activate the voltage regulator and the voltage of the current from the delay circuit is at a second level When the control means does not pass current and does not operate the voltage regulator, its input port is connected to the output terminal of the voltage regulator, and the output port is connected to the control means via the delay circuit. And the first from the voltage regulator A processor that is activated to receive the DC power at the level to maintain the voltage at the first level and to turn on the power supply to the display; and a connection between the processor and the delay circuit. And an electronic switch that outputs a trigger signal to the processor when pressed, and when the electronic switch is pressed when the power of the display is in the ON state. Outputting the trigger signal to the processor to release the maintenance, converting the voltage of the first level to the second level to turn off the power of the display, When the electronic switch is pressed again, the second level voltage is returned to the first level, and the trigger signal is output to the processor to maintain and display the first level voltage. Device is on To provide a display dexterity power saving device according to claim which are in place so that it can be.

  Thereby, when the power of the display is on, the voltage of the current entering the control means is always maintained at the first level, and when the power of the display is off, the control enters the control means. Since the voltage of the current is at the second level, the voltage regulator is not activated and no current can flow to the processor.

  That is, when the power saving device for a display according to this configuration is provided in the display, the power is not supplied to the processor when the power of the display is in an off state. There is no use and power saving effect can be achieved.

  The processor includes a non-volatile memory, and displays the power status of the display with a power status flag, stores the power in the non-volatile memory, and when the electronic switch is pressed. It is preferable that the power supply state flag is provided so that the power supply can be switched between an on state where the power of the display is on and an off state where the power supply of the display is off.

  Thereby, since the power state of the display device is stored in the processor, when the power supply is restored after the power failure, the processor determines whether to supply power to the peripheral device based on the stored power state. If, for example, the power of the indicator is on before the power failure, the processor causes the peripheral device to supply power after the power recovery and maintains the voltage at the first level. When the power of the display is off, the processor converts the voltage to the second level without supplying power to the peripheral device after the power is restored, and the power from the voltage regulator to the processor itself. Supply can be eliminated.

  In addition, based on the power saving device for a display, the inventor further provides a display provided with the power saving device for a display. When the power is off, the display device does not supply power to the processor and the peripheral devices of the processor, so that power can be saved.

  In the power saving device for a display and the display using the same according to the above configuration, when the power of the display is in an off state, no power is supplied to the processor. The saving effect can be achieved.

  Hereinafter, preferred embodiments of the present invention will be described in detail. In the following description, components having substantially the same function and configuration will be denoted by the same reference numerals, regardless of their size, and repeated description will be made only when necessary.

  FIG. 3 is a block diagram showing a first embodiment of the display power saving device of the present invention and a display using the same. As shown in the drawing, the display power saving device 3 includes an AC / DC converter 31, a voltage regulator 32, and a delay circuit 33 connected between the AC / DC converter 31 and the voltage regulator 32. A processor 34 for receiving power from the voltage regulator 32, an electronic switch 35 connected between the processor 34 and the delay circuit 33, and a processor 34 provided between the delay circuit 33 and the voltage regulator 32; Control means (described later).

  More specifically, the AC / DC converter 31 converts external AC power (AC) into DC power (DC) and outputs the DC power. Upon receiving the DC power from the AC / DC converter 31, the voltage regulator 32 is activated to adjust the voltage of the DC power to a desired voltage and output it. In this embodiment, the voltage regulator 32 includes an input terminal (Vin) connected to the AC / DC converter 31, an output terminal (FB) connected to the processor 34, and a control terminal serving as the control unit. (SHDN). When the voltage of the current from the delay circuit 33 is at the first level, the control terminal (SHDN) controls the voltage by operating the voltage regulator 32 by passing the current, thereby adjusting and outputting the voltage. When the voltage of the current from 33 is at the second level, the voltage regulator 32 does not operate without passing the current, that is, the voltage regulator 32 functions so as not to regulate and output the voltage. I have.

  In this embodiment, the first level is a low level, and the second level is a high level higher than the first level.

  The delay circuit 33 includes a resistor (R) and a capacitor (C). The resistor (R) has an input terminal 331 connected to the AC / DC converter 31 and an output terminal 332 connected to a control terminal (SHDN) as the control means. One end of the capacitor (C) is connected to the output end 332 of the resistor (R), the electronic switch 35 and the processor 34, and the other end is grounded.

  The processor 34 has its input port 341 connected to the output terminal (FB) of the voltage regulator 32, and its output port 342 connected to the control terminal (SHDN) of the voltage regulator 32 via the delay circuit 33. When receiving the DC power at the low level from the voltage regulator 32, the power supply is activated to maintain the voltage at the low level and to turn on the power supply to the display.

  In the present embodiment, a micro processor is used as the processor 34. Further, the processor 34 includes a nonvolatile memory 343, and displays the power state of the display with a power state flag, stores the power state in the nonvolatile memory 343, and presses the electronic switch 35. Then, the power state flag is provided so that it can be switched between ON, in which the power of the display is ON, and OFF, in which the power of the display is OFF.

  When pressed, the electronic switch 35 outputs a trigger signal to the processor 34 and grounds.

  Hereinafter, an operation when power is supplied to the display by the display power saving device 3 will be described. First, after the external AC power of, for example, 110 V or 220 V is converted into the DC power of, for example, 12 V by the AC / DC converter 31, the input terminal (Vin) of the voltage regulator 32 and the control Enter the end (SHDN). Since the current entering the control terminal (SHDN) passes through the resistor (R) of the delay circuit 33, the current is adjusted to a low level voltage, and then input to the control terminal (SHDN) of the voltage regulator 32 for the first time. I do. At this time, since the voltage of the current input to the control terminal 3 is at a low level, the voltage regulator 32 is operated to adjust the 12 V DC power input from the input terminal 1 to 5 V DC power, thereby processing the processor 34. When the processor 34 receives the low-level DC power from the voltage regulator 32, the processor 34 is activated to read the power status flag stored in the nonvolatile memory 343, and based on the power status flag, the delay circuit is activated. It controls whether or not the capacitor (C) of 33 is charged.

  For example, if the power status flag is on, the processor 34 maintains the voltage at the low level, that is, the capacitor (C) is not charged, and power is supplied to a peripheral device (not shown). Of the display to be turned on. If the power state flag is off, the processor 34 converts the low level voltage to a high level by charging the capacitor (C). At this time, the processor 34 enters the control terminal (SHDN) of the voltage regulator 32. Since the voltage of the generated current is at the high level, the voltage regulator 32 is not operated, and the current cannot flow to the processor 34, and the power of the display is turned off.

  Also, when the power of the display is in the ON state, that is, when the current flows from the voltage regulator 32 to the processor 34, when the electronic switch 35 is pressed, the processor 34 The power state flag stored in the non-volatile memory 343 is read out based on the trigger signal of (3), the power state flag is switched from on to off, the low level is maintained, and the capacitor (C) is charged. The low level voltage is converted to the high level, and the power of the display is turned off.

  Further, at this time, when the electronic switch 35 is pressed again, the electronic switch 35 is discharged by instantaneous grounding to return the high-level voltage to the low level. After recovering the current flow and maintaining the voltage at the low level under the control of the processor 34, the power status flag stored in the nonvolatile memory 343 is turned on from off based on a trigger signal from the electronic switch 35. And the display is powered on.

  That is, when the power of the display is on, the voltage of the current flowing into the control terminal (SHDN) is always kept at a low level, and when the power of the display is off, the control terminal (SHDN) is off. ) Is at the second level, so that the voltage regulator 32 is not activated and the current cannot flow to the processor 34.

  Accordingly, when the power of the display is off, power is not supplied to the processor 34, so that there is no wasteful use of power consumption and an effect of saving power can be achieved. Further, since the power status flag of the display is stored in the nonvolatile memory 343, when the power supply is restored after the power failure, the processor 34 reads out the stored power status flag first, and Is determined to maintain the voltage at the low level or the high level based on the power supply, the power state of the display can be restored to the state before the power interruption.

  FIG. 4 is a block diagram showing a second embodiment of the display power saving device and the display using the same according to the present invention. The difference of the second embodiment from the first embodiment is that a transistor 36 is used as the control means instead of the control end (SHDN). More specifically, the control terminal (SHDN) of the voltage regulator 32 is grounded. The transistor 36 has a gate electrode connected to the output terminal 332 of the resistor (R), and a source electrode and a drain electrode connected to the input terminal (Vin) of the AC / DC converter 31 and the voltage regulator 32, respectively. ing. Also, when the voltage of the current flowing into the gate electrode is at the first level, the transistor 36 conducts between the source electrode and the drain electrode, and transfers the current from the AC / DC converter 31 to the voltage regulator 32. When the voltage of the current flowing into the gate electrode is at the second level, the voltage between the source electrode and the drain electrode is not conducted. In addition, it functions so as not to operate the voltage regulator 32. In the present embodiment, since the control terminal of the voltage regulator 32 has no function, a voltage regulator having no control terminal may be used.

  The power saving device for a display of the present invention and the display using the same use an electronic switch, but when the power of the display is off, power is supplied to both the processor and peripheral devices of the processor. Since the power is not supplied, there is no waste of power, and an effect of saving power can be achieved. Further, after the power is suddenly interrupted due to a power failure or the like and then recovered, the power state of the display can be automatically recovered to the state before the power was interrupted.

  The embodiments described above are intended only to clarify the technical contents of the present invention, and the present invention is not limited to such specific examples and is not interpreted in a narrow sense. Various modifications can be made within the spirit and scope of the claims.

It is a block diagram which shows the electric power supply apparatus for displays using the conventional mechanical switch. It is a block diagram which shows the power supply apparatus for displays using the conventional electronic switch. 1 is a block diagram showing a first embodiment of a power saving device for a display of the present invention and a display using the same. FIG. 4 is a block diagram showing a second embodiment of the display power saving device and the display device using the same according to the present invention.

Explanation of reference numerals

3 display power saving device 31 AC / DC converter 32 voltage regulator 33 delay circuit 34 processor 341 input port 342 output port 343 non-volatile memory 35 electronic switch

Claims (7)

An AC / DC converter that converts external AC power into DC power and outputs the DC power;
When receiving the DC power from the AC / DC converter, a voltage regulator that is activated to adjust and output the voltage of the DC power,
A delay circuit connected between the AC / DC converter and the voltage regulator;
The delay circuit is provided between the delay circuit and the voltage regulator, and when the voltage of the current from the delay circuit is at a first level, passes the current to operate the voltage regulator; Control means for not passing current and activating said voltage regulator when the voltage of the current from is at a second level;
An input port thereof is connected to an output terminal of the voltage regulator, an output port thereof is connected to the control means via the delay circuit, and receives DC power at the first level from the voltage regulator. A processor activated to maintain the voltage at the first level and to turn on power to the display;
An electronic switch that is connected between the processor and the delay circuit and outputs a trigger signal to the processor when pressed.
When the electronic switch is pressed when the power of the display is in the on state, the trigger signal is output to the processor to release the maintenance, and the voltage of the first level is released. To the second level to turn off the power of the display, and when the electronic switch is pressed again, returns the voltage at the second level to the first level. And a display for outputting the trigger signal to the processor to maintain the voltage at the first level and to turn on the power of the display. Power saving device. The first level is a low level, the second level is a high level higher than the first level,
The device of claim 1, wherein the electronic switch outputs the trigger signal to the processor and grounds the moment the switch is pressed. The processor includes a non-volatile memory, and
Displaying the power status of the display with a power status flag, and storing the power status in the nonvolatile memory;
And, when the electronic switch is pressed, the power status flag can be switched between on, in which the power of the display is on, and off, in which the power of the display is off. The power saving device for a display device according to claim 1, wherein the power saving device is provided as described above. The delay circuit includes a resistor and a capacitor,
The resistor has an input terminal connected to the AC / DC converter, and an output terminal connected to the control unit,
The power saving device of claim 2, wherein one end of the capacitor is connected to the control unit, the electronic switch, and the processor, and the other end is grounded.   The voltage regulator has an input terminal connected to the AC / DC converter, an output terminal connected to the processor, and a control terminal as the control means. 4. The power saving device for a display device according to claim 1.   A transistor is used as the control means, and the transistor has a gate electrode connected to the output terminal of the resistor, and a source electrode and a drain electrode connected to the AC / DC converter and the voltage regulator, respectively. The power saving device for a display device according to claim 4, wherein the power saving device is connected to the power supply.   A display, comprising the power saving device for a display according to any one of claims 1 to 6.

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