JPH11202982A - Power supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply device which can reduce the size and weight of an optical disk drive, etc., and switch electric power in use to other electric power without any break of the electric power and provides stable electric power supply. SOLUTION: This unit is equipped with a voltage measurement part 2 which measures the voltages of specific electric power and other electric power inputted individually and independently, an electric power selection part 3 which selects as one operating power source electric power larger than a voltage value that a load requires out of the electric power measured by the voltage measurement part 2 and outputs it to the load side, and a voltage dropping part 5 which lowers the electric power other than the electric power selected by the electric power selection part 3 to a voltage value lower than the specific electric power when the selected electric power is the said specific electric power and outputs it to the output side of the electric power selection part 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an optical disk device,
The present invention relates to a power supply device that supplies operation power to a load such as a tape recorder and a speaker, and more particularly to a power supply device that switches power input from a plurality of power supplies and supplies the power to a load.

In particular, this power supply device is effective in application to peripheral devices connected to a portable personal computer (hereinafter simply referred to as a personal computer) to a portable optical disk device and the like.

[0003]

2. Description of the Related Art Conventionally, as this kind of power supply device, there is one applied to a portable type optical disk device used by connecting to a personal computer or the like. This conventional power supply device is built in an optical disk device and has a power input unit for inputting commercial power converted by an AC adapter and power of a battery or a battery. And outputs one of the powers to the load side as an operation power supply.

[0004]

Since the conventional power supply device is configured as described above, the number of power sources to be input to the power input unit is small. Most of the optical disk devices and the like are used with batteries or batteries housed therein, and there is a problem that the weight of the optical disk device or the like is increased by the battery or the battery that is heavier than the outer shape, and the handling property or portability is impaired. Further, when the operation power supply is switched from the battery or the battery to the commercial power supply, a temporary power interruption occurs at the time of the switching, and there is a problem that it is difficult to supply power stably.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention makes it easy to secure an operation power source other than a battery or a battery housed in an optical disk device or the like, and requires a dedicated battery or battery used in the optical disk device or the like. It is an object of the present invention to provide a power supply device capable of reducing the weight of an optical disk device or the like, performing power switching during use without causing power interruption, and stably supplying power.

[0006]

According to the power supply apparatus of the present invention, when specific power is output to the load as an operating power, the other power is reduced to a voltage lower than the specific power. Since the output voltage of the power selection unit is provided with a voltage drop unit, the power output from the voltage drop unit during the temporary power interruption that occurs when the operating power supply is switched from a specific power to another power is reduced. Since the power is supplied as the operating power, it is possible to switch the operating power without interrupting the power, and to stably supply the operating power. In addition, by increasing the number of sources of operation power supply, it is easy to secure the operation power supply, and it is possible to reduce the necessity of a battery or battery housed in the optical disk device or the like, and to reduce the weight of the optical disk device or the like. .

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, a specific power and another power are individually and independently input,
A voltage measuring unit for measuring the voltage of each of the plurality of powers, and a power selecting unit for selecting and outputting one power having a voltage value or more required by the load from the power measured by the voltage measuring unit as one operation power supply. A voltage drop unit that, when the power selected by the power selection unit is the specific power, drops another power to a voltage value lower than the specific power and outputs the voltage to the output side of the power selection unit. Since the power higher than the voltage required by the load is output as one operation power supply, the operation of supplying the optimum power to the operation power supply is provided. Also,
By increasing the number of sources of the operation power supply, it is easy to secure the operation power supply, it is possible to reduce the necessity of a battery or a battery housed in the optical disk device or the like, and it is possible to reduce the weight of the optical disk device or the like. Having.

Further, since the power selected by the power selection unit drops the other power to a voltage value lower than the specific power by the specific power and outputs the voltage to the output side of the power selection unit, the operating power supply is specified by the specific power. When the power is switched to another power, the operation power can be switched without causing the power interruption occurring at the time of the switching, and the operation power can be stably supplied. Since the power output from the voltage dropping unit is stepping down the voltage, it has the effect of preventing backflow to the power selection unit due to the voltage difference.

According to a second aspect of the present invention, the voltage drop section is formed by a bypass circuit connected in parallel to the power selection section, and the voltage drop section is formed in a simple sequence. Has the effect of being able to.

According to a third aspect of the present invention, the power supply selection section selects and outputs the voltage value measured by the voltage measurement section based on the magnitude of the voltage value and / or a preset priority order. It has the effect of being able to always supply the power that is the optimal operating power supply, including the power input from the

According to a fourth aspect of the present invention, the specific power is:
The power is built in the personal computer in advance, and the other power is the commercial power converted by the AC adapter and the power of the battery or battery. The power of the battery built in the personal computer is supplied as the operating power. In the middle, commercial power converted by AC adapter later,
If the battery or battery power is valid, switching can be performed without power interruption, and the valid power can be output as the operating power, so that the power consumption of the PC battery can be reduced and the operating power can be stabilized. It has the effect of being able to supply.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIGS. (Embodiment 1) FIG. 1 is a block circuit configuration diagram of an optical disk device according to a first embodiment of the present invention, FIG. 2 is a block configuration diagram of a power selection unit of FIG. 1, and FIG. 3 is a control unit of FIG. Is shown.

In each of the drawings, an optical disk device according to the present embodiment has a power P of a power supply built in a personal computer as a specific power, a power A of commercial power converted by an AC adapter and another battery. Power B as another power, and a voltage measuring unit 2 for measuring the voltages of the power A, power B, and power P which are individually and independently input, based on a measurement result of the voltage measuring unit 2. A power selector 3 for selecting, from among the powers A, B, and P, a power higher than a voltage value required by the load and having a predetermined priority earlier as an operation power supply and outputting the selected power to the voltage converter 4; A voltage converter 4 for converting the power output from the power supply 3 into a voltage suitable for the operation power supply; a power A or a power B input to the power selector 3; Output from selector 3 A voltage dropping unit 5 that drops the voltage to a value lower than the power to be output, and a control unit that controls the power selection unit 3 based on the operation program recorded in the ROM unit 6a for the measurement result of the voltage measurement unit 2. 6 is provided.

The priorities of the powers A, B, and P are set in advance so that the other powers A and B have the highest priority over the power P.

As shown in FIG. 2, the power selection unit 3 selects a power having a higher voltage from the power A and the power B and outputs the selected power, and the first power selection unit 8 A switch 9 for inputting power output from the terminal 9a to a terminal 9a and switching the terminal 9a or the terminal 9b and the terminal 9c to a cut-off state or a conduction state under the control of the control unit 6, A voltage transformer 10 for transforming and outputting the output power; and one of the power output from the voltage transformer 10 and the power P input from the third power input terminal 17c controlled by the controller 6. A second power selection unit 11 that outputs to the voltage conversion unit 4 based on the voltage value and the priority, and a terminal 9a of the switch 9 is switched to a closed circuit when a control signal 211 is input from the control unit 6, and the control signal 211 Will be opened if no The terminal 9a of the vessel 9 and the first driving unit 12 to closing the terminal 9b as well as the open circuit, the second power selecting section 11 when the control signal 213 is input from the control unit 6
Is switched to the closed state, and when the control signal 213 is not input, the second driving section 13 opens the terminal 11a of the second power selecting section 11 and closes the terminal 11b.
This is a configuration including:

As shown in FIG. 2, the voltage drop unit 5 branches the power output from the voltage transformation unit 10 and outputs the power from the voltage output from the second power selection unit 11 to the output side of the second power selection unit 11. The output drops to a low voltage value. Therefore, when the voltage value of the terminal 11b of the second power selection unit 11 is high, the backflow of the current can be prevented by the diode forming the voltage drop unit 5.

The first power selection section 8 has a first power input terminal 1
A diode 15 connected in a forward bias state with respect to the power A input from the
And the second power input terminal 1
And a diode 16 connected in a forward bias state with respect to the power B input from 7b.

By the action of these diodes 15 and 16, the power having the higher voltage value among the powers A, B and P is output to the switch 9. Since the diode has a forward drop voltage due to its characteristics, the voltage of the power output from the switch 9 has a voltage drop corresponding to the forward drop voltage of the diode on the power supply circuit, and power loss occurs. However, when the voltage drop and the power loss do not matter, the power selecting unit 3 is inexpensive.

The switch 9 has a normally-open terminal 9a and a normally-closed terminal 9b, and outputs an output signal 21 output from the first drive unit 12 which operates in response to a control signal 211 of the control unit 6.
With the input of 0, the normally open terminal 9a switches to a closed circuit,
When there is no output signal 210 from the first drive unit 12, the normally open terminal 9a is open and the normally closed terminal 9b is closed. The power output from the first power selector 8 is conducted to the normally open terminal 9a, and nothing is connected to the normally closed terminal 9b.

The second power selector 11 includes a normally open terminal 11a.
And a normally closed terminal 11b, and the normally open terminal 11a is switched to a closed circuit by the input of the output signal 212 output from the second drive unit 13 which is operated by the input of the control signal 213 of the control unit 6. And an output signal 2 from the second driving unit 13.
In a state where there is no terminal 12, the normally open terminal 11a is open and the normally closed terminal 11b is closed. The power output from the voltage transformer 10 is conducted to the normally open terminal 11a, and the power P inputted from the third power input terminal 17c is conducted to the normally closed terminal 11b.

As shown in FIG. 2, the control unit 6 outputs a control signal 215 to the voltage measuring unit 2 when any one of the electric powers A, B, and P is input to the voltage measuring unit 2, and Among the input power A, power B, and power P, a power higher than the voltage value required by the load and having a preset priority is output to the control unit 6, and the power is stored in the control unit 6. A /
The D converter determines whether it is valid or invalid.

If this determination result is valid, the control unit 6 sends a control signal 211 to the power selection unit 3 so that the power is output from the power selection unit 3 to the voltage conversion unit 4 as an operation power source.
213 is output to control the power selection unit 3.

Next, the operation of the optical disk device according to the first embodiment based on the above configuration will be described. The power switching procedure by the control signals 211 and 213 of the control unit 6 will be described with reference to an operation flowchart shown in FIG. For the sake of simplicity, the following description is based on the premise that the priority order of power A, power B, and power P is A>B> P.

The operation flowchart of FIG. 3 simplifies a power switching sequence controlled based on an operation program recorded in the ROM section 6a. S11 in FIG. 3 determines the validity / invalidity of the powers A and B. If the power A or the power B is valid, the control unit 6 outputs a control signal 211 to the first drive unit 12 in S12 to open and close. The normally open terminals 9a and 9c of the switch 9 are closed, and the power output from the first power selector 8 is transmitted from the switch 9 to the voltage transformer 10
Output to

At this time, the power output from the voltage transformer 10 is also output to the anode side of the diode of the voltage dropping unit 5, and the power is output from the cathode side of the diode of the voltage dropping unit 5 to the output side of the second power selection unit 11. Output to the second
On the output side of the power selection unit 11, the power P conducted to the normally closed terminal 11b is also output. However, as described above, the power output from the diode of the voltage drop unit 5 does not become higher than the power P due to the forward drop voltage of the diode of the voltage drop unit 5, so that the power is output from the diode of the voltage drop unit 5. The power does not flow backward in the direction of the second power selection unit 11.

Next, in S13, a control signal 213 is output to the second drive unit 13 of the second power selection unit 11 so that the second power selection unit 1
1, the normally open terminal 11a and the terminal 11c are closed, the power output from the voltage transformer 10 is output from the second power selector 11 to the voltage converter 4, and the power is output from the first power selector 8. The power is used as an operation power supply, and is converted from the voltage conversion unit 4 to the voltage of the operation power supply required for the device and output.

The normally open terminal 11 of the second power selector 11
The power output from the first power selection unit 8 that has been output through the diode of the voltage drop unit 5 due to the conduction between the terminal a and the terminal 11c is reduced by the second power selection unit without passing through the diode of the voltage drop unit 5. 11 directly, and no power loss is caused by the forward voltage drop of the diode.

Assuming that A>B> P, the power A is selected by the first power selection unit 8 and the power A is also selected by the second power selection unit 11. The output power is supplied as operation power.

Next, if the continuation of the power supply is YES in S14, the power supply is continued by looping from S11 to S14. If the continuation of the power supply is NO, the power supply ends.

If the determination in S11 is NO, the process proceeds to S15 in which the validity / invalidity of the power P is determined. If the validity of the power P is determined to be YES in S15, the first drive of the switch 9 is determined in S16. The control signal 211 is not output to the unit 12, the normally closed terminals 9 b and 9 c of the switch 9 are kept closed, and the power output from the first power selection unit 8 is cut off by the switch 9.

Next, in S17, the control signal 213 is not output to the second drive unit 13 of the second power selection unit 11, and the normally closed terminals 11b and 11c of the second power selection unit 11 are kept closed. The power P from the third power input terminal 17c is output from the second power selection unit 11 to the voltage conversion unit 4, and the power output from the voltage transformation unit 10 is cut off to reduce the power P of the third power input terminal 17c. The power is output from the second power selection unit 11 to the voltage conversion unit 4 as an operating power supply, and is converted from the voltage conversion unit 4 to a voltage required for the device and output.

If the determination in S15 is NO, S
In 18, the control signal 211 is not output to the first drive unit 12 of the switch 9, the normally closed terminals 9 b and 9 c of the switch 9 are kept closed, and the power output from the first power selection unit 8 is The switch 9 is turned off.

Next, in S19, a control signal 213 is output to the second drive section 13 of the second power selection section 11 so that the second power selection section 1
The normally open terminal 11a and the terminal 11c are closed.
The power P from the power input terminal 17c is cut off. As a result, the power A of the first power input terminal 17a, the power B of the second power input terminal 17b, and the power P of the third power input terminal 17c are not output to the voltage conversion unit 4 as operating powers, respectively, but are output to the optical disc device. Does not supply any operating power.

Further, when the power P at the third power input terminal 17c is output from the voltage transformer 4 as an operating power source, the power A or the power B, which becomes another power having a higher priority later.
Is input, the determination of YES is made in S11, and the power A is replaced with the power A, as described above, on the assumption that A>B> P.
Alternatively, the power B is output from the voltage conversion unit 47 as an operation power supply.

At this time, the normally closed terminals 11b and 11c of the second power selection unit 11 are switched to an open circuit to cut off the power P, and the normally open terminals 11a and 11c are closed and the voltage conversion unit 4 is closed. Output power A or power B to
Since the power A or the power B is output from the diode of the voltage dropping unit 5 to the output side of the second power selection unit 11 before the switching, the power is cut off when the power P is switched to the power A or the power B. Since the power can be switched without the need, stable power supply can be performed.

Since the power output from the diode of the voltage drop section 5 is lower than the voltage output from the second power selection section 11, the power does not flow backward to the second power selection section 11.

Further, since the operating power source can be secured from a wide range of sources, the necessity of batteries or batteries can be reduced, and the portable optical device can be carried without batteries or batteries, and the optical disk can be made lighter and more portable. Further, when the power P output from the personal computer is supplied as the operating power, if the power A or the power B is supplied later, the power P
Since the operating power can be switched and supplied to the power A or the power B without causing power interruption, power consumption of the personal computer can be reduced.

[0038]

According to the present invention, there are advantages that the number of operating power sources can be increased, the operating power can be easily secured, the necessity of batteries or batteries can be reduced, and the weight of the optical disk device can be reduced. Effects can be obtained. In addition, when supplying another power as an operating power while supplying a specific power as an operating power, the power can be switched without interrupting the power, and a stable power can be supplied to a small electronic device. Can be operated stably. Furthermore, at the time of power switching, since the voltage of the power output from the voltage drop unit is not applied with a reverse voltage due to the voltage difference, there is an advantageous effect that power switching can be performed in a simple sequence.

[Brief description of the drawings]

FIG. 1 is a block circuit configuration diagram of an optical disc device according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a power selection unit in FIG. 1;

FIG. 3 is an operation flowchart of a control unit in FIG. 1;

[Explanation of symbols]

 Reference Signs List 2 voltage measuring unit 3 power selecting unit 4 voltage converting unit 5 voltage dropping unit 6 control unit 6a ROM unit 8 first power selecting unit 9 switch 9a terminal 9b terminal 9c terminal 10 voltage transforming unit 11 second power selecting unit 11a terminal 11b Terminal 11c Terminal 12 First drive unit 13 Second drive unit 15 Diode 16 Diode 17a First power input terminal 17b Second power input terminal 17c Third power input terminal 211, 213, 215 Control signals 210, 212 Output signals A, B , P power

Claims (4)

[Claims] A specific power and another power are individually and independently input, and a voltage measuring unit for measuring a voltage of each of the plurality of powers and a load from among the powers measured by the voltage measuring unit are required. And a power selection unit that selects one power equal to or higher than a voltage value as an operation power supply and outputs the power to the load side, and when the power selected by the power selection unit is the specific power, another power is set to the specific power. A voltage drop unit that drops the voltage to a lower voltage value and outputs the voltage to the output side of the power selection unit. 2. The power supply device according to claim 1, wherein said voltage drop section is formed by a bypass circuit connected in parallel to said power selection section. . 3. The power supply device according to claim 1, wherein the power supply selection unit selects the power supply based on the magnitude of the voltage value measured by the voltage measurement unit and / or a preset priority order. A power supply device for outputting. 4. The power supply device according to claim 3, wherein the specific power is a power supply built in the personal computer in advance, and the other power is commercial power converted by an AC adapter, a battery or A power supply device characterized by using the power of a battery.