JP2002300719A - Power device and electronic apparatus provided with the power device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power device capable of surely and exactly performing the start of the supply of power to a plurality of power supply wires in a predetermined order and the stop of the supply of the power of the plurality of power supply wires, to which the power is supplied, in a predetermined order, and an electronic apparatus provided with the power supply. SOLUTION: The power devices 50, 50a, 60, 60a, 70 and 70a start the supply of the power to the plurality of power supply wires a, b and c, respectively, in the predetermined order, and stop the supply of the power of the plurality of power supply wires a, b and c, to which the power is supplied, in the predetermined order, respectively. Each device comprises at least one power supply means 1, 1a or 1b for supplying the power to the plurality of power supply wires a, b and c, and also comprises a control means 26, 27 or 28 for detecting whether or not the power is supplied to the plurality of power supply wires a, b and c, controlling the power supply means 1, 1a and 1b so as to be in the predetermined order, and starting and stopping the supply of the power to the plurality of power supply wires a, b and c in succession.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention starts power supply to a plurality of power supply lines in a predetermined order and stops power supply to the plurality of power supply lines to which power is supplied in a predetermined order. The present invention relates to a power supply device and an electronic apparatus including the power supply device.

[0002]

2. Description of the Related Art FIG. 10 is a block diagram showing an example of the electrical configuration of a conventional power supply device 150. FIG.
6 is a timing chart showing an operation example of the conventional power supply device 150 of FIG. The power supply device 150 of FIG. 10 has a function of controlling the order of starting and disconnecting the two outputs. This power supply device 150 includes a power supply circuit 101, a line a switch 10
2, line b switch 103, line a as output,
It has a line b and an on / off signal generation circuit 104.
Signal 105 indicates an on / off signal of line a,
Signal 106 indicates an on / off signal for line b.

The line a switch 102 and the line b switch 103 have a signal line 105 and a signal line 106 as inputs, respectively. When the input signal is Hi, the switch is closed, and when the input signal is Low, the switch is opened. .

The on / off signal generation circuit 104 includes:
The input / output characteristics are as shown in FIG. That is, the on / off signal generation circuit 104 sets the switch signal 120 to Hi with respect to the switch signal 120 input from the outside.
, The ON / OFF signal of the line a immediately outputs Hi, and the ON / OFF signal of the line b outputs Hi after the time T1.

When the switch signal 120 becomes low, the line a on / off signal 105 becomes low after time T2.
And the line b on / off signal 106 is immediately Lo.
Output w. The times T1 and T2 are set to values larger than the rise time of the line a and the fall time of the line b, respectively. Here, the switch signal 120
On the other hand, the times T1 and T2 for delaying the on / off signals 105 and 106 are determined in advance based on the rise and fall times of the respective lines.
Therefore, in the conventional power supply device 150, in the normal operation state, the startup and disconnection order as set is maintained.

[0006]

However, the voltage of the line a decreases during operation due to a failure of the power supply circuit 101 in FIG. 10 or an overload of the output portion thereof, or the line a is not output at the time of startup. In such a case, the order of activation and disconnection may not be maintained. Also, the rise and fall times usually have to be set with a margin because there are variations in parts and fluctuations due to the environment. Therefore, there is a disadvantage that the time required for starting and disconnecting becomes longer than necessary. is there.

Accordingly, the present invention solves the above problems, and starts power supply to a plurality of power supply lines in a predetermined order, and stops power supply to a plurality of power supply lines being supplied in a predetermined order. It is an object of the present invention to provide a power supply device capable of reliably and accurately performing an operation, and an electronic apparatus including the power supply device.

[0008]

According to a first aspect of the present invention, a plurality of power supply lines are started to be supplied with power in a predetermined order, and the plurality of power supply lines being supplied with power are supplied. A power supply device for stopping power supply in a predetermined order, at least one power supply means for supplying power to each of the plurality of power lines, and whether power is supplied to the plurality of power lines. Control means for detecting the presence or absence of each of the power supply lines, controlling the power supply means so as to be in the predetermined order, and sequentially starting or stopping power supply to the plurality of power lines. This is achieved by a power supply device that is characterized. According to the configuration of the first aspect, the control unit detects whether or not power is supplied to the plurality of power lines, and in a state in which power is supplied to the predetermined power line, the control unit detects the next power line. Start supplying power to the power line. Then, the control means detects a state in which power supply to the predetermined power supply line is stopped,
The power supply to the next power supply line is stopped. Therefore, the power supply device can start supplying power to the plurality of power supply lines in a predetermined order, and stop the plurality of power supplies being supplied in a predetermined order. Therefore, the power supply device surely and accurately starts power supply to the plurality of power supply lines in a predetermined order and stops power supply to the plurality of power supply lines being supplied in a predetermined order. It can be carried out.

A second aspect of the present invention is characterized in that, in the configuration of the first aspect, a plurality of the power supply means are provided, and operate independently without receiving power supply from each other. According to the configuration of claim 2, in the operation of claim 1, the plurality of power supply units are connected to the plurality of power supply lines even when one of the power supply units cannot supply power due to a failure or the like. On the other hand, power supply can be started or stopped in a predetermined order.

According to a third aspect of the present invention, in the configuration of the second aspect, the predetermined order is always a part of the plurality of power supply lines while power is supplied to the second power supply line. A power supply is supplied to the first power supply line, wherein the power supply means comprises: a first power supply means for supplying power to the first power supply line; A second power supply unit for supplying power to a second power line as a part of the line, wherein the control unit detects whether power is supplied to the first power line. A first detection unit, a second detection unit that detects whether power is supplied to the second power supply line, and power supply of the first power supply unit and the second power supply unit. And a switch for determining whether to enable the power supply and start the power supply. The first detection means detects whether or not power is supplied to the first power supply line when a start signal is input to the first power supply line, and supplies power to the first power supply line. To start the power supply to the second power supply line, and that the power is supplied to the second power supply line by the second detection means when a stop signal for stopping the power supply is input. Whether or not the second
In the state where power is supplied to the power supply line, the power supply to the first power supply line is controlled so as not to be stopped. According to the configuration of claim 3, in the operation of claim 2, when the start signal is input, the power supply is first started to the first power supply line, and then the power supply is supplied to the second power supply line. The supply will start. The power supply is
When the stop signal is input, first, the power supply to the second power supply line is stopped, and then the first power supply is stopped.

According to a fourth aspect of the present invention, in the configuration of the third aspect, a discharge circuit is provided in the second power supply line,
The discharge circuit discharges the second power supply line in conjunction with the stop of the power supply to the second power supply line. According to the configuration of claim 4, in addition to the function of claim 3, the second power supply line to which power has been supplied can be quickly discharged. Therefore, the second power supply line is always connected to the first power supply line.
The power supply is stopped before the power supply line.

According to a fifth aspect of the present invention, in the configuration of the first aspect, the plurality of power supply lines are a first power supply line and a second power supply line as the plurality of power supply lines receiving power supply from one power supply means. The predetermined order is such that the power is always supplied to the first power supply line while the power is supplied to the second power supply line. And the control unit is provided between the power supply unit and the first power supply line, and determines whether to supply power of the power supply unit to the first power supply line. 1 switch, and a second switch that is provided between the power supply unit and the second power supply line and that determines whether to supply power from the power supply unit to the second power supply line.
Switch, first detection means for detecting whether or not power is supplied to the first power supply line, and second detection means for detecting whether or not power is supplied to the second power supply line And characterized in that: According to the configuration of claim 5, in addition to the function of claim 1, when the start signal is input, the control unit turns on the first switch to supply power from the power supply unit to the first power supply line. Start supplying. And
When the first detecting means detects that power is supplied to the first power supply line, the control means turns on the second switch to supply power from the power supply means to the second power supply line. To start. Further, when the stop signal is input, the control unit turns off the second switch to stop the power supply from the power supply unit to the second power line. Then, when the first detecting means detects that power is not supplied to the first power supply line, the control means turns off the second switch and switches the power supply means from the first power supply line to the first power supply line. Stop the power supply.

According to a sixth aspect of the present invention, in the configuration of the fifth aspect, the control means detects the first power supply line by the first detection means when a start signal for starting power supply is input. To detect if power is being supplied to
Turning on the second switch in a state where power is supplied to the first power supply line, starting power supply from the power supply means to the second power supply line, and stopping power supply. When the stop signal is input, the second detection means detects whether or not power is supplied to the second power supply line. In a state where power is supplied to the second power supply line, It is characterized in that control is performed so that the first switch is not turned off and the power supply to the first power supply line is not stopped. According to the configuration of claim 6, when the start signal is input, the power supply always starts first to the first power supply line, and then starts the power supply to the second power supply line. Become like Further, in the power supply device, when the stop signal is input, the power supply to the second power supply line is first stopped first, and then the first power supply is stopped.

According to a seventh aspect of the present invention, in the configuration of the fifth aspect, the plurality of power supply lines further include a third power supply line that receives power supply from one of the power supply means. The order in which power is supplied to the third power supply line is controlled so that power is always supplied to the second power supply line, and the control unit further controls the power supply to the third power supply line. The power supply means is provided between the power supply means and the third power supply line.
A third switch for determining whether or not power is supplied to the power line, and a third detecting means for detecting whether or not power is supplied to the third power line. When input, the first detection means sets the first
It is detected whether or not power is supplied to the power supply line, and the second switch is turned on in a state where the power is supplied to the first power supply line. In which power is supplied to the second power supply line, and whether or not power is supplied to the second power supply line is detected by the second detection means, and power is supplied to the second power supply line. The third switch is turned on to start power supply from the power supply unit to the third power supply line. When the stop signal is input, the third detection unit outputs the third switch. To detect whether or not power is supplied to the power supply line of the second power supply line. In a state where power is supplied to the third power supply line, the power supply of the second power supply line is not turned off without turning off the second switch. Without stopping, the second detection means It is detected whether or not power is supplied to the power supply line. In a state where power is supplied to the second power supply line, the first switch is not turned off, and the power supply to the first power supply line is stopped. It is characterized in that it is controlled not to stop. According to the configuration of claim 7, when the start signal is input, the power supply first starts the power supply to the first power supply line, then starts the power supply to the second power supply line, Power supply to the third power supply line is started. Also, when the stop signal is input, the power supply first stops the power supply to the third power supply line, then stops the power supply to the second power supply line, and then stops the first power supply Will be stopped.

According to an eighth aspect of the present invention, in the configuration of the seventh aspect, a discharge circuit is provided in the third power supply line,
The discharge circuit discharges the third power supply line in conjunction with the stop of the power supply to the third power supply line. According to the configuration of claim 8, in addition to the function of claim 7, the third power supply line to which power has been supplied can be quickly discharged. Therefore, the third power supply line is always connected to the second power supply line.
The power supply is stopped before the power supply line.

The above object is achieved according to the ninth aspect of the present invention by:
An electronic device equipped with a power supply device that starts power supply in a predetermined order to a plurality of power supply lines and stops power supply to the plurality of power supply lines being supplied in a predetermined order. At least one power supply unit for supplying power to each of the plurality of power lines; and detecting whether or not power is supplied to the plurality of power lines, respectively, so that the predetermined order is established. The present invention is achieved by an electronic apparatus including a power supply device having a control unit that controls a power supply unit and sequentially starts or stops power supply to the plurality of power lines. According to the configuration of claim 9, the control unit detects whether or not power is supplied to the plurality of power lines, and in a state where power is supplied to a predetermined power line, the control unit detects the next power line. Start supplying power to the power line. Then, the control means detects a state in which power supply to the predetermined power supply line is stopped, and then stops power supply to the next power supply line. Therefore, the power supply device can start supplying power to the plurality of power supply lines in a predetermined order, and stop the plurality of power supplies being supplied in a predetermined order. Therefore, the electronic device reliably and accurately starts power supply to the plurality of power lines in a predetermined order and stops power supply to the plurality of power lines being supplied in a predetermined order. The power supply can be controlled as it does.

[0017]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Note that the embodiments described below are preferred specific examples of the present invention,
Although various technically preferable limits are given, the scope of the present invention is not limited to these modes unless otherwise specified in the following description.

First Embodiment FIG. 1 is a block diagram showing a configuration example of a display device 58 as an example of an electronic apparatus equipped with a power supply device 50 to which a power supply device according to a first embodiment of the present invention is applied. . The display device 58 is, for example, a plasma display panel (PD).
This is a display device including a P (Plasma Display Panel) 56, and includes lines a and b as a plurality of power lines, a scan driver 52, a data driver 54, and a power device 50.

The plasma display panel 56 is a type of a thin display, and displays a display object using light generated by gas discharge like a fluorescent lamp. The plasma display panel 56 has a configuration in which a gas is sealed in helium, neon, or the like for light emission between two glass substrates provided with electrodes, for example, and a phosphor is applied to the glass substrate.

This plasma display panel 56
When a high voltage is applied to this gas to discharge it, ultraviolet light is generated, which shines upon the phosphor. Unlike a liquid crystal display, it emits light by itself, so that it has a feature of high contrast and a wide viewing angle. On the other hand, the plasma display panel 56 is difficult to use with a battery because the driving voltage is high. Therefore, the display device 58 is provided with the power supply device 50.

The power supply unit 50 is connected to a scan driver 52 and a data driver 54 via, for example, two output lines a and b. The data driver 54 has a function of handling data of a display object to be displayed on the plasma display panel 56,
The scan driver 52 has a function of scanning a display area when displaying an image on the plasma display panel 56.

Therefore, in the display device 58, the scan driver 52 must be ready for the scan process before the data driver 54 processes the data of the display object. That is, the scan driver 5
2, the power must be supplied before the data driver 54.

On the other hand, in the display device 58, if the scan processing by the scan driver 52 is completed during the data processing by the data driver 54, the data may not be processed. Scan process must not end. That is, the power supply to the scan driver 52 must not be stopped before the power supply to the data driver 54 ends. Therefore, the display device 58 must be configured such that power is always supplied to the scan driver 52 while the data driver 54 is processing data.

FIG. 2 is a block diagram showing an example of the electrical configuration of the power supply device 50 of FIG. The power supply device 50 includes lines a and b, a power supply circuit 1, and a control unit 26. The control unit 26 includes a line a switch 2, a line b switch 3, a line a voltage detection circuit 7, and a line b voltage detection circuit. 8, A
An ND circuit 9 and an OR circuit 10 are provided.

First, an example of a connection configuration of the power supply device 50 will be described. The power supply circuit 1 is connected to a line a via a line a switch 2 and a line b switch 3
Is connected to the line b. The voltage detection circuit 7 is connected to the line a, and the voltage detection circuit 7 is connected to the AND circuit 9. On the other hand, a voltage detection circuit 8 is connected to the line b, and this voltage detection circuit 8 is connected to the OR circuit 10. A switch signal 20 is input to each of the AND circuit 9 and the OR circuit 10. The AND circuit 9 is connected to the line b switch 3, and the OR circuit 10 is connected to the line a switch 2.

Next, an example of the function of each block of the power supply device 50 will be described. The power supply circuit 1 includes a plurality of power supply lines,
For example, one power supply for supplying two power supplies of two lines a and b. As described above, the line a is connected to the power supply circuit 1 via the line a switch 2, and the line b is connected to the power supply circuit 1 via the line b switch 3. Therefore, the line a switch 2 can determine whether to supply power from the power supply circuit 1 and the line b switch 3 can determine whether to supply power from the power supply circuit 1.

More specifically, the line a switch 2 and the line b switch 3 receive a line a on / off signal S5 and a line b on / off signal S6, respectively. When the input signal is Hi, the switches are turned on. When the switch is closed and the switch is low, the switch is opened. The voltage detection circuit 7 and the voltage detection circuit 8 output Hi when the voltage of each line a and line b is higher than a preset threshold value, and output Low when the voltage is low. The line a on / off signal S5 is a signal output from the OR circuit 10, and the line b on / off signal S6 is a signal output from the AND circuit 9.

As described above, the power detection circuits 7 and 8 are connected to the lines a and b, respectively, and the power detection circuits 7 and 8 are supplied with power to the connected lines a and b, respectively. It has a function of detecting whether or not it is running. The power detection circuit 7 outputs, for example, Hi to the input side of the AND circuit 9 when it detects that power is supplied to the line a, and outputs, for example, Low when it detects that power is not supplied to the line a. The switch signal 20 is input to the input side of the AND circuit 9. Therefore, the AND circuit 9
Can control the line b switch 3 based on the input signal from the power supply detection circuit 7 and the switch signal 20.

On the other hand, the voltage detection circuit 8 outputs, for example, Hi to the input side of the OR circuit 10 when it detects that power is supplied to the line b, and outputs, for example, Low when it detects that power is not supplied to the line b. . The switch signal 20 is input to the input side of the OR circuit 10. Therefore,
The OR circuit 10 can control the line a switch 2 based on the input signal from the power supply detection circuit 8 and the switch signal 20.

The power supply device 50 is configured as described above.
Next, an example of the operation will be described with reference to FIGS. FIGS. 3A to 3C respectively show the power supply device 5.
6 is a timing chart showing an example of operation of a zero. FIG.
3 (A) to 3 (C), the operation timing is expressed with a certain delay to make it easier to see the operation timing. At the start of normal power supply (hereinafter referred to as “start”), Hi is input as the switch signal 20 first. Before the start, both the lines a and b are off, so that both the voltage detection circuit 7 and the voltage detection circuit 8 output Low. When Hi is input as the switch signal 20, AN
The on / off signal S6 of the line b is Lo by the D circuit 9.
While w is maintained, the line a on / off signal S5 becomes Hi by the OR circuit 10, and first, only the line a switch 2 is turned on, and power supply from the power supply circuit 1 to the line a is started.

Next, when the voltage of the line a is output, the output of the voltage detection circuit 7 becomes Hi, so that the line b on / off signal S6 becomes Hi by the AND circuit 9, and the line b
The switch 3 is turned on, and power supply from the power supply circuit 1 to the line b is started.

Accordingly, the power supply to the line a is always started before the power supply to the line b is started.

In the case of stopping the power supply (hereinafter referred to as “disconnection”), first, a low is input to the switch signal 20.
Before this disconnection, since both the lines a and b are on and the voltage is output, both the voltage detection circuit 7 and the voltage detection circuit 8 output Hi. Therefore, the OR circuit 10
As a result, the line b switch 3 is turned off by the AND circuit 9 turning the line b on / off signal S6 low while the line a on / off signal S5 is maintained at Hi, and the power supply to the line b is stopped. .

When the power supply to the line b is stopped, the voltage of the line b decreases, and the output of the voltage detection circuit 8 eventually becomes Lo.
Therefore, the line a switch 2 is turned off when the line a on / off signal S5 also becomes low by the OR circuit 10, and the power supply to the line a is stopped.

Accordingly, the power supply to the line b is stopped before the power supply to the line b is stopped. In this manner, the power supply device 50 is controlled such that the power supply start-up sequence and the cut-off sequence of the line a and the line b are correctly determined in advance.

Abnormal State Next, the abnormal state shown in FIG. 3B will be described, in which the power supply to the line a is not started due to some abnormality at the time of startup. In this case, since the output of the voltage detection circuit 7 is kept at Low,
The line b on / off signal S6 is also low by the AND circuit 9.
The power supply to the line b is not started in the state of ow, and there is no violation of the previously set start order.

As for the abnormal state shown in FIG. 3 (C), a case where the voltage of the line a is reduced due to some abnormality during the operation will be described. In FIG. 3A other than FIG. 3C, whether the signal is Hi or Low is described by exemplifying the voltage as 100% or 0% as a threshold value. In (C), the signal is Hi between these.
It is assumed that a first threshold value for determining that the threshold value is set and a second threshold value 24 for determining that the signal is low are set.

In this case, for example, the output of the voltage detection circuit 7 becomes low when the voltage falls below the second threshold value 24 set in advance, and the line b on / off signal S6 becomes low by the AND circuit 9. , The line b switch 3 is turned off, and the power supply to the line b is stopped.
It does not go against the cutting order.

According to the first embodiment of the present invention, the control of the starting order and the cutting order of the two outputs, for example, the lines a and b, can be performed precisely without considering variations in the rise time and the fall time. Can be controlled. Also, according to the power supply device 50, the startup processing at that time
The time required for the cutting process can be reduced to the minimum required time. Further, according to the power supply device 50, even when the output voltage is abnormal due to a circuit failure or the like, the start and stop of the power supply can be controlled in a preset order that does not violate the start order and the disconnection order.

Second Embodiment FIG. 4 shows a power supply device 50a according to a second embodiment of the present invention.
FIG. 2 is a block diagram showing an example of the electrical configuration of the embodiment. The power supply device 50a according to the second embodiment has substantially the same configuration as the power supply device 50a according to the first embodiment in FIGS. 1 and 2, and therefore, the same configuration is denoted by the same reference numerals as those in FIGS. The description thereof will be omitted, and different points will be mainly described.
The power supply device 50a according to the second embodiment is different from the power supply device 50 according to the first embodiment in that a discharge circuit 12 is further provided in addition to the configuration of the power supply device 50 according to the first embodiment. .

The discharge circuit 12 is provided anywhere in the line b, preferably between the line b switch 3 and the voltage detection circuit 8 in the line b. The discharge circuit 12 has a function of discharging the line b, and has, for example, a configuration including a resistor and a switch element. The input of the discharge circuit 12 is L
When it becomes ow, the switch is closed and the line b is short-circuited to ground through a resistor. The input of the discharge circuit 12 uses, for example, a line b switch signal S6.

Here, in an actual power supply device, usually, a capacitor is attached between the output line and the ground to stabilize the output. Therefore, even if the output is stopped by the power supply circuit, the voltage of the output line does not immediately decrease because of the charge stored in the capacitor. In addition, since the charge stored in the capacitor is discharged by the load current of the line, the speed of voltage drop varies depending on the state of the load.

In the power supply device 50a, when the power supply to the line b is stopped by associating the discharge circuit 12 with the on / off of the line b, the line b is forcibly stopped.
, And the voltage is quickly reduced.

The power supply device 50a is configured as described above. Next, a characteristic portion of an operation example of the power supply device 50a will be described with reference to FIGS. The power supply device 50a
As shown in the voltage state of the lower line b in FIG. 3A, the transition should be like a solid line, and the power supply to the line b should be stopped before the line a. However, line b has a falling edge 29 due to the delay for the above reason.
As shown in (1), there is a case where the fall time for the voltage of the line b to fall to Low is long.

In this case, for example, when the voltage of the line b is H
If it takes time to fall from i to low, such as the fall 29 due to the delay indicated by the dotted line, the line b may go low after the line a goes from hi to low. In other words, in this case, although the line b must originally be low before the line a, the line b is low by ΔD later than the line a.

In order to prevent such a situation, the discharge circuit 12 ensures that the voltage of the line b falls from Hi to Low before the voltage of the line a, as shown by the fall 30 due to the discharge. Then, the voltage of the line b is discharged (discharged) at a predetermined timing, and is discharged as indicated by a dotted line.

According to the second embodiment of the present invention, substantially the same effects as in the first embodiment can be exerted, and in addition, the line b to which power has been supplied can be rapidly discharged. Can be. Therefore, the power supply to the line b is always stopped before the power supply to the line a.

Third Embodiment FIG. 5 is a block diagram showing an example of an electrical configuration of a power supply 70 to which a power supply according to a third embodiment of the present invention is applied. A power supply device 70 according to a third embodiment is shown in FIGS.
In FIG. 3, since the configuration is substantially the same as that of the power supply device 50 according to the first embodiment, the same configuration is denoted by the same reference numerals as those in FIGS.

A power supply device 70 according to the third embodiment includes lines a and b, power supply circuits 1a and 1b, and a control unit 27. The control unit 27 includes an input switch circuit 11, an AND circuit 9, an OR circuit 10, and a power supply Detection circuits 7 and 8 are provided.

That is, the power supply device 70 includes an AND circuit 9, an OR circuit 10, and voltage detection circuits 7 and 8 similarly to the power supply device 50 of the first embodiment, and is used in the first embodiment. An input switch circuit 11, a power supply circuit 1a, and a power supply circuit 1b are provided instead of one power supply circuit 1, a line a switch 2, and a line b switch 3, respectively.

First, a connection configuration example of the power supply device 70 will be described. The input switch circuit 11 includes a power supply circuit 1a,
1b. The power supply circuit 1a is connected to a line a
, And the power supply circuit 1b is connected to the line b. A power detection circuit 7 is connected to the line a, and a power detection circuit 8 is connected to the line b.

The power detection circuit 7 is connected to an AND circuit 9, and the power detection circuit 8 is connected to an OR circuit 10. A switch signal 20 is input to the AND circuit 9 and the OR circuit 10. The power supply circuit 1b is connected to the AND circuit 9, and the OR circuit 10
Is connected to an input switch circuit 11.

Next, an example of the function of each block of the power supply 70 will be described. In the power supply device 50 of FIG. 2 as the first embodiment, two voltages of lines a and b are output from one power supply circuit 1, but FIG.
Power supply circuit 70 includes separate power supply circuits 1a, 1b
Is used to output each voltage. The power supply circuit 1b has a function of turning on / off the output in response to an external signal S6 from the AND circuit 9, and for example, the line b switch 3 in FIG. 2 is used to realize this function.

Further, in the power supply device 70 of FIG. 5, as shown in FIG.
In place of the switch 3, as shown in FIG.
The input switch circuit 11 is used as a function of simultaneously turning on / off the inputs a and 1b.

Here, the power supply circuits 1a and 1b operate independently without receiving power supply from each other and supply power to a plurality of power supply lines, as can be seen from the figure. With such a configuration, even if one power supply circuit, for example, the power supply circuit 1a cannot supply power due to a failure or the like, the power supply circuits 1a and 1b are determined in advance for a plurality of power supply lines. The power supply can be started or stopped in a specified order.

The power supply device 70 is configured as described above.
Next, an operation example of the power supply device 70 will be described with reference to FIGS. 1 to 3 and 5. Since the timing chart showing the operation example of the power supply device 70 is the same as the timing chart of the power supply device 50 as the first embodiment shown in FIG. 2, the description of the same steps will be given using the same reference numerals. The description will be omitted, and different points will be mainly described below.

In the power supply device 70, the power supply device 50 of the first embodiment shown in FIG.
The operation of the power supply circuits 1a and 1b is different. Specifically, the input switch circuit 11 is configured to be able to turn on / off the input of the power supply circuits 1a and 1b.
The line a is supplied with power by the power supply circuit 1a, and the line b is supplied with power by the power supply circuit 1b. Therefore, the lines a and b are configured such that power is supplied or the supply is stopped by the operation of the input switch circuit 11, respectively.

Therefore, the input switch circuit 11 turns on / off not only the input of the power supply circuit 1a but also the input of the power supply circuit 1b. Therefore, as shown by a solid line in FIG. Since the line b is always turned off while the line b is off, the line b is not affected by the on / off of the line a. That is, the supply of the power supplied to the line a while the power is supplied to the line b is not stopped.

According to the third embodiment of the present invention, substantially the same effects as in the first embodiment can be exerted.

Fourth Embodiment FIG. 6 shows a power supply device 70a according to a fourth embodiment of the present invention.
FIG. 3 is a block diagram illustrating a configuration example of FIG. The power supply device 70a according to the fourth embodiment has substantially the same configuration as the power supply device 70 according to the third embodiment in FIG. 5, and therefore, the same components are denoted by the same reference numerals as those in FIG. The description will focus on the differences.

This power supply device 70a shows an example in which the discharge circuit 12 is added to the line b in the power supply device 70 as the third embodiment, as in the second embodiment. Discharge circuit 1 of FIG. 6 in the fourth embodiment
2 has the same function as the discharge circuit 12 of FIG. 4 in the second embodiment.

According to the fourth embodiment of the present invention, substantially the same effects as those of the third embodiment can be exerted, and in addition to this, the power supply to the line b is made after the switch signal 20 is set to Low. The time until the stop can be made constant regardless of the load state of the line b, and the off-time can be shortened, so that a more stable off-operation can be performed even during an abnormal operation. ing.

Fifth Embodiment FIG. 7 is a block diagram showing an electrical configuration example of a power supply device 60 to which a power supply device according to a fifth embodiment of the present invention is applied. The power supply device 60 according to the fifth embodiment is shown in FIGS.
In FIG. 3, since the configuration is substantially the same as that of the power supply device 50 according to the first embodiment, the same configuration is denoted by the same reference numerals as those in FIGS.

The power supply device 60 has three outputs, lines a, b, and c, and is different from the power supply device 50 of FIG. 2 as the first embodiment having two outputs, lines a, b. .

Specifically, the power supply device 60 includes lines a, b, and c, a power supply circuit 1, and a control unit 28. The control unit 28 includes a line a switch 2, a line b switch 3, and a line c switch. 4, OR circuits 11, 22, AND
Circuits 13 and 14 and power supply detection circuits 7, 8 and 43 are provided.

First, a connection configuration example of the power supply device 60 will be described. The power supply circuit 1 is connected to a line a switch 2, a line b switch 3, and a line c switch 4. The line a switch 2 is connected to a power detection circuit 7 via a line a.
It is connected to the ND circuit 13. Line switch circuit 3
Is connected to a power supply detection circuit 8 via a line b. The power supply detection circuit 8 is connected to an AND circuit 14 and an OR circuit 1.
1 connected. Line c switch 4 is connected to line c
The power supply detection circuit 43 is connected to the OR circuit 22 via the power supply detection circuit 43.

Next, an example of the function of each block of the power supply device 60 will be described. The switch signal 20 is input to the AND circuit 14, the OR circuit 22, and the OR circuit 11. The OR circuit 22 is connected to the AND circuit 13, and the AND circuit 13 is connected to the line b switch 3. The line b switch 3 is opened or closed according to the line b on / off signal S6 output from the AND circuit 13. The AND circuit 14 includes:
Connected to the line c switch 4 and the AND circuit 14
The line c switch 4 is opened or closed in accordance with the line c on / off signal S7 output by the. The line a switch 2 is configured to open and close according to a line a on / off signal S5 output from the OR circuit 11.

The power supply device 60 is configured as described above.
Next, an operation example of the power supply device 60 will be described with reference to FIG. FIG. 8 is an example of a timing chart illustrating an operation example of the power supply device 60. The timing chart of the switch signal 20 to line b in FIG. 8 is shown in FIG.
Therefore, the same steps are denoted by the same reference numerals, and the description thereof will be omitted.

Starting Process First, when Hi is input to the switch signal 20 in FIG.
The OR circuit 11 and the OR circuit 22 each output Hi. Accordingly, the line a switch 2 is closed, and power is first supplied to the line a from the power supply circuit 1.

When power is supplied to the line a, the voltage detection circuit 7 outputs Hi to the AND circuit 13. Therefore, the AND circuit 13 outputs the line b on / off signal S6 to the line b switch 3 based on the signal from the voltage detection circuit 7, and the power supply from the power supply circuit 1 is started to the line b.

When power is supplied to the line b, the voltage detection circuit 8 outputs Hi to the OR circuit 11 and the AND circuit 14.
Is output. Here, the reason why Hi is output to the OR circuit 11 is that while the power is supplied to the line b, the line a switch 2 is turned on so that the power supply to the line a is not stopped first. This is because it is necessary. Then, the AND circuit 14 turns on the line c switch 4 based on the line c on / off signal S7, and the power supply from the power supply circuit 1 to the line c is started.

[0072] cutting processing other hand, when the Low is inputted to the switching signal 20, AN
Low is input to the D circuit 14, the OR circuit 22, and the OR circuit 11. As a result, the AND circuit 14 outputs the line c
Low as line c switch 4 as on / off signal S7
Output to Therefore, first, the power supply from the power supply circuit 1 to the line c is stopped. The voltage detection circuit 43 is connected to the line c
When it is detected that power is not supplied to the OR circuit 22, a low signal is output to the OR circuit 22. Next, the OR circuit 22 outputs a Low as the line b on / off signal S6 to the AND circuit 13 based on the input Low signal and the previously input Low signal of the switch signal 20. Therefore, the line b switch 3 is connected from the power supply circuit 1 to the line b.
Stop supplying power to the

When power supply detecting circuit 8 detects that power is not supplied to line b, AND circuit 14 and O
Low is output to the R circuit 11. The OR circuit 11 can stop the power supply from the power supply circuit 1 to the line a by outputting Low to the line a switch 2 as the line a on / off signal S5.

Therefore, when the power supply device 60 is activated, it is output in the order of line a, line b, and line c, and when it is disconnected, the output is dropped in the order of line c, line b, and line a (the power supply is stopped). Is done).

According to the fifth embodiment of the present invention, substantially the same effects as those of the first embodiment can be obtained, and in addition to this, the power supply can be surely performed in the order of line a, line b and line c. Supply can be started,
The power supply can be stopped in the order of line c, line b, and line a. That is, this power supply device 6
0 indicates that power can be sequentially supplied to the power supply lines in a predetermined order. Therefore, the power supply to the line b is not stopped while the power is supplied to the line c, and the power supply to the line a is not stopped while the power is supplied to the line b.

Sixth Embodiment FIG. 9 shows a power supply device 60a according to a sixth embodiment of the present invention.
FIG. 3 is a block diagram illustrating a configuration example of FIG. The power supply device 60a according to the sixth embodiment has substantially the same configuration as the power supply device 60 according to the fifth embodiment in FIGS. 7 and 8, and the same components are denoted by the same reference numerals as those in FIGS. The description thereof will be omitted, and different points will be mainly described.

This power supply device 60a shows an example in which the discharge circuit 12 is added to the line c in the power supply device 60 as the fifth embodiment, as in the second embodiment. Discharge circuit 1 of FIG. 9 in the sixth embodiment
2 has the same function as the discharge circuit 12 of FIG. 4 in the second embodiment.

According to the sixth embodiment of the present invention, substantially the same effects as those of the fifth embodiment can be exerted, and in addition to this, the power supply to the line c is made after the switch signal 20 is set to Low. The time until the stop is constant regardless of the load state of the line c, and the off-time can be shortened, so that a more stable off-operation can be performed even in an abnormal operation.

The present invention is not limited to the above embodiment. In the above-described embodiment, a display device is illustrated as an example of a device that requires power supply to a plurality of power lines. However, the present invention is not limited to this, and it is necessary to supply power to a plurality of power lines in a predetermined order. It can be applied to any electronic device. Each configuration of the above embodiment can be partially omitted or arbitrarily combined so as to be different from the above.

[0080]

As described above, according to the present invention,
A power supply device capable of reliably and accurately starting power supply to a plurality of power supply lines in a predetermined order and stopping power supply to the plurality of power supply lines being supplied in a predetermined order. And an electronic device including the power supply device.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration example of a display device as an example of an electronic apparatus including a power supply device to which a power supply device according to a first embodiment of the invention is applied.

FIG. 2 is a block diagram showing an example of an electrical configuration of the power supply device of FIG.

FIG. 3 is a timing chart illustrating an operation example of a power supply device.

FIG. 4 is a block diagram showing an example of an electrical configuration of a power supply device according to a second embodiment of the present invention.

FIG. 5 is a block diagram illustrating an electrical configuration example of a power supply device to which the power supply device according to the third embodiment of the present invention is applied.

FIG. 6 is a block diagram showing a configuration example of a power supply device according to a fourth embodiment of the present invention.

FIG. 7 is a block diagram showing an example of an electrical configuration of a power supply device to which a power supply device according to a fifth embodiment of the present invention is applied.

FIG. 8 is a timing chart illustrating an operation example of a power supply device.

FIG. 9 is a block diagram showing a configuration example of a power supply device according to a sixth embodiment of the present invention.

FIG. 10 is a block diagram showing an electrical configuration example of a conventional power supply device.

11 is a timing chart showing an operation example of the conventional power supply device of FIG.

[Explanation of symbols]

1 power supply circuit (power supply means), 1a power supply circuit (power supply means, first power supply means), 1b ...
Power supply circuit (power supply means, second power supply means);
..Voltage detection circuits, 8 ... voltage detection circuits, 11 ...
Input switch circuits, 26, 27, 28: control unit (control means), 50, 50a: power supply device, 58: display device, 60, 60a: power supply device, 70, 70a
A power line, a line (first power line, plural power lines), b line (second power line, plural power lines), c line (third power line) Power line, multiple power lines)

Claims (9)

[Claims] 1. A power supply device for starting power supply to a plurality of power supply lines in a predetermined order, and stopping power supply to the plurality of power supply lines being supplied in a predetermined order. At least one power supply unit for supplying power to each of the plurality of power lines, and detecting whether or not power is supplied to the plurality of power lines, respectively, so that the predetermined order is established. A power supply device comprising: a control unit that controls a power supply unit and sequentially starts or stops power supply to the plurality of power lines. 2. The power supply device according to claim 1, wherein a plurality of said power supply means are provided, and operate independently without receiving power supply from each other. 3. The method according to claim 1, wherein the predetermined order is such that the first power supply is always supplied to the second power supply line as a part of the plurality of power supply lines while the power supply is supplied to the second power supply line. The power supply line is controlled so that power is supplied to the power line. The power supply unit includes a first power supply unit that supplies power to the first power line, and a power supply unit that supplies power to the second power line. A second power supply unit that supplies power, the control unit detects whether power is supplied to the first power supply line, and the second power supply. A second detector for detecting whether or not power is supplied to the line; and a switch for determining whether or not the power supply of the first power supply and the second power supply is enabled. When the start signal for starting the power supply is input. Detecting whether or not power is supplied to the first power supply line, and starting power supply to the second power supply line while power is being supplied to the first power supply line When a stop signal for stopping power supply is input, the second detection means detects whether or not power is being supplied to the second power supply line. The power supply device according to claim 2, wherein the power supply is controlled so as not to stop the power supply to the first power supply line in a state where power is supplied. 4. A discharge circuit is provided on the second power supply line, and the discharge circuit discharges the second power supply line in conjunction with the stop of power supply to the second power supply line. The power supply device according to claim 3, wherein the power supply is performed. 5. The plurality of power supply lines include a first power supply line and a second power supply line as the plurality of power supply lines receiving power supply from one power supply unit, and The order is a sequence in which power is always supplied to the first power supply line while power is supplied to the second power supply line. A first switch that is provided between the power supply unit and the first power supply line and that determines whether to supply power from the power supply unit to the first power supply line; A second switch that is provided between the first power supply line and a second switch that is provided between the second power supply line and the second power supply line. First detecting means for detecting whether or not power is supplied to the second power supply line; And a second detecting means for detecting whether or not the power is supplied.
The power supply device according to claim 1. 6. The control means causes the first detection means to detect whether power is supplied to the first power supply line when a start signal for starting power supply is input. Turning on the second switch in a state where power is supplied to the first power supply line, starting power supply from the power supply means to the second power supply line, and stopping power supply. Detecting whether power is supplied to the second power supply line by the second detection means when a stop signal is input to the second power supply line, and supplying power to the second power supply line. The power supply device according to claim 5, wherein control is performed so that the first switch is not turned off and power supply to the first power supply line is not stopped. 7. The plurality of power supply lines further include a third power supply line that receives power supply from one of the power supply means, and the predetermined order further includes a third power supply line. The sequence is such that the power is always supplied to the second power supply line while the power is supplied, and the control unit further controls the power supply unit between the power supply unit and the third power supply line. A third switch for determining whether to supply the power of the power supply unit to the third power supply line, and detecting whether or not power is supplied to the third power supply line And when the start signal is input, the first detection means detects whether or not power is supplied to the first power supply line, and While the power is supplied to the first power line, the second switch Turning on the switch, starting power supply from the power supply means to the second power supply line, and detecting whether power is supplied to the second power supply line by the second detection means, The third switch is turned on in a state where power is supplied to the second power supply line, and power supply is started from the power supply means to the third power supply line, and the stop signal is input. When the power is supplied to the third power supply line, the third detection means detects whether or not power is supplied to the third power supply line. Without turning off the power supply, stopping the power supply to the second power supply line, and detecting whether or not power is supplied to the second power supply line by the second detection means, In the state where power is supplied to the line, the first 7. The power supply device according to claim 6, wherein control is performed so that a switch is not turned off and power supply to the first power supply line is not stopped. 8. A discharge circuit is provided on the third power supply line, and the discharge circuit discharges the third power supply line in conjunction with stoppage of power supply to the third power supply line. The power supply device according to claim 7, wherein the power supply is performed. 9. An electronic device equipped with a power supply device for starting power supply to a plurality of power supply lines in a predetermined order and stopping power supply to the plurality of power supply lines being supplied in a predetermined order. At least one power supply unit for supplying power to each of the plurality of power lines; detecting whether power is supplied to the plurality of power lines; and determining the predetermined order. An electronic apparatus, comprising: a power supply device having a control means for controlling the power supply means so as to satisfy the following conditions and sequentially starting or stopping the power supply to the plurality of power lines.