JP2001161070A - Power supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply a correct power to a plurality of electronic devices. SOLUTION: An output voltage Vra is supplied from a controller 16 to control an output voltage Va of a DC-DC converter 13a. Moreover, polarity of voltage Va is set with a polarity control signal FRa. This voltage Va is outputted via an output control unit 14a. When it is determined, based on the switching condition signal SWa, that output of the voltage Va is stopped with the output control unit 14a, the level and polarity of the voltage Va can be varied by generating the reference signal Vra depending on the manipulation signal CT from the manipulation unit 17 and the signal FRa. The correct power can be supplied to a plurality of electronic devices by operating the converter 13b also in the same manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a power supply device. In detail, for example, a plurality of systems of power are supplied to the external device from the power supply unit, and the power supply unit is controlled by the control unit such that the supplied power becomes a condition set by the output setting unit. In the control means,
When the power supply to the external device is stopped by the output control unit, the change of the condition by the output setting unit is accepted, so that the output voltage, the polarity, and the like are changed during the power supply to the external device. It is to prevent that.

[0002]

2. Description of the Related Art In a conventional portable electronic device, for example, a tape recorder, a mini disk device, a compact disk device, etc., a power supply connector for connecting an AC adapter so that it can be driven not only by a battery but also by a commercial power supply. Is provided.

[0003] An AC adapter is attached to each electronic device or set as an option. This AC adapter supplies power of a predetermined DC voltage level generated from a commercial power supply to the electronic device. .
Therefore, the electronic device can be driven without a battery.

Power is supplied from an AC adapter to not only portable electronic devices but also stationary electronic devices with low power consumption, such as communication terminals such as modems, printers, and scanners. ing.

[0005]

By the way, in the AC adapter as described above, the output voltage and the output current are designed so that the corresponding electronic equipment can be operated, and the polarity of the power supply connector also corresponds. Electronic equipment. For this reason, when operating a plurality of electronic devices using a commercial power supply, outlets must be prepared for AC adapters corresponding to the respective electronic devices. In addition, when the plug to be inserted into the outlet is provided on the AC adapter main body and the main body is large, if the outlets are close to each other, the AC adapter cannot be connected to each outlet, and the outlet is used effectively. Can not do.

[0006] Further, general-purpose AC adapters that can freely set the output voltage and polarity are also provided, but these AC adapters can set the output voltage and polarity freely. Electric power may be supplied to the electronic device.

In view of the above, the present invention provides a power supply device capable of supplying correct power to a plurality of electronic devices with respect to an electronic device operable by receiving power supply from an AC adapter.

[0008]

A power supply device according to the present invention includes a power supply unit for supplying power to an external device, an output setting unit for setting conditions for power supplied to the external device, and a power supply unit for supplying power to the external device. Control means for controlling the power supply means, so that the power becomes the condition set by the output setting means,
Output control means for controlling the supply of power from the power supply means to the external device, the control means, when the supply of power to the external device is stopped by the output control means,
The change of conditions by the output setting means is accepted.

In the present invention, for example, a plurality of DC-
A plurality of systems of power are supplied to external devices using a DC converter. The control unit controls the DC-DC converter so that the supplied power has the output voltage and the polarity set by the output setting unit. In the control means, when the supply of power to the external device is stopped by the output control means, the output setting means accepts a change in the output voltage or the polarity.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a power supply device according to the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a configuration of a power supply device. A switching regulator unit 12 is connected to the AC plug 11, and when the AC plug 11 is attached to an AC outlet (not shown) and supplied with power from a commercial power supply line, the switching regulator unit 12 has a substantially constant power. The DC voltage Vm is generated and supplied to the DC-DC converters 13a and 13b. In addition, the switching regulator unit 12 generates a power supply voltage Vct for operating the control unit 16 described later and supplies the power supply voltage Vct to the control unit 16, and a power supply required for performing a display operation on the display unit 18 described later. The voltage Vds is generated and supplied to the display unit 18.

The DC-DC converter 13a is supplied with the reference voltage Vra and the polarity control signal FRa from the controller 16, and the DC-DC converter 13a makes the supplied DC voltage Vm equal to the reference voltage Vra. The output voltage Va is converted into a voltage level to generate an output voltage Va, and the output voltage Va is output as a polarity based on the polarity control signal FRa. Similarly, a reference voltage Vrb and a polarity control signal FRa are supplied from the control unit 16 to the DC-DC converter unit 13b, and the supplied DC voltage Vm is equal to the reference voltage Vrb in the DC-DC converter unit 13b. The output voltage Vb is converted to a voltage level to generate the output voltage Vb, and the output voltage Vb is output as a polarity based on the polarity control signal FRa. The output voltage Va from the DC-DC converter unit 13a is supplied to the output control unit 14a and the DC-D
The output voltage Vb from the C converter 13b is supplied to the output controller 14b.

The output control units 14a and 14b are configured using switches that can be switched between a conductive state and a non-conductive state and that maintain the switched state. A jack 15a is connected to the output control unit 14a, and a jack 15b is connected to the output control unit 14b.
When the output control unit 14a is turned on, DC-
The output voltage Va supplied from the DC converter 13a is supplied to the jack 15a. When the output control unit 14b is turned on, the DC-DC converter unit 13b
Output voltage Vb is supplied to the jack 15b. Further, the output control units 14a and 14b generate switch state signals SWa and SWb indicating whether the switches are conducting or non-conducting, and supply them to the control unit 16.

An output setting operation unit 17 is connected to the control unit 16 constituted by using a microcomputer or the like. When an operation signal CT is supplied to the control unit 16 in response to the operation of the output setting operation unit 17, When the control unit 16 determines that the output control units 14a and 14b are in a non-conductive state based on the switch state signals SWa and SWb, the control unit 16 changes the voltage levels of the reference voltages Vra and Vrb or adds a new polarity based on the operation signal CT. The control signals FRa and FRb are generated. Control unit 1
In step 6, a display signal DP indicating the voltage levels and polarities of the output voltages Va and Vb is generated and supplied to the display unit 18. Therefore, the polarity and voltage level of the voltage output from the jacks 15a and 15b can be easily confirmed by the display based on the display signal DP on the display unit 18.

FIG. 2 shows an embodiment of the output control units 14a and 14b, the output setting operation unit 17, and the display unit 18 provided on the outer surface of the power supply device 10. Here, the output control unit 14
When a is operated, the switch is turned on or off, and the supply of power to the electronic device connected to the jack 15a is controlled. Similarly, the output control unit 14
By operating b, power supply to the electronic device connected to the jack 15b is controlled.

The UP key 171a of the output setting operation section 17 is an operation key for increasing the voltage level of the output voltage Va, and the DOWN key 172a is an operation key for decreasing the voltage level of the output voltage Va. The polarity switch 173a is a switch for selecting which of the outer terminal and the inner terminal of the jack 15a is the positive terminal and the other terminal is the negative terminal. Here, when the switch of the output control unit 14a is turned off and the output voltage Va is not supplied from the DC-DC converter unit 13a to the jack 15a, the UP key 171a or the DOWN key 172a
And the setting state of the polarity switch 173a is enabled, and the voltage level can be changed or the polarity can be switched only when power is not supplied to the electronic device connected to the jack 15a. Is done.

Similarly, the UP key 1 of the output setting operation unit 17
71b is an operation key for increasing the voltage level of the output voltage Vb, and the DOWN key 172b is an operation key for decreasing the voltage level of the output voltage Vb. The polarity switch 173b is a switch for selecting which of the outer terminal and the inner terminal of the jack 15b is the positive terminal and the other terminal is the negative terminal, and is connected to the jack 15b from the DC-DC converter unit 13b. When the output voltage Vb is not supplied, the key operation and the setting state of the switch are validated, and only when the power is not supplied to the electronic device connected to the jack 15b, the voltage level is reduced. It is possible to change and switch the polarity.

Further, when the key operation and the setting state of the switch are made valid and the voltage levels of the output voltages Va and Vb and the polarity are switched, the display of the display areas 18a and 18b of the display unit 18 is changed to the changed state. The changed setting can be confirmed.

The power supply 10 shown in FIGS.
In order to simplify the description, a case where power is supplied to two electronic devices has been described. However, a DC-DC converter, an output control unit, a jack, and the like are provided according to the number of connected electronic devices. If the voltage level and the polarity are set as described above, each electronic device can be operated without providing an AC adapter in each electronic device.

Since the voltage level and the polarity can be changed only when power is not supplied to the electronic device, an overvoltage or a reverse voltage may be erroneously applied during the operation of the electronic device. Can be prevented.

In the above embodiment, the DC-
Output control unit 1 between DC converter unit 13 and jack 15
3, the output setting operation unit 17 may be provided with an output on / off switch 175 for starting or stopping the supply of power to the electronic device as output control means, as in the power supply device 20 shown in FIG. Good. Note that FIG.
In FIG. 7, the same reference numerals are given to portions corresponding to those in FIG.

In this case, the control unit 16N outputs the operation signal C
When it is determined by T that the output on / off switch 175 has been operated, the DC-
By starting or stopping the oscillation operation in the DC converters 13a and 13b, the DC-DC converters 13a and 13b
Control the output from 13b. Therefore, the output control unit 1
The power supply to the electronic device can be controlled without the provision of the power supply 4, and the power supply device can be configured at low cost.

[0022]

According to the present invention, when the supply of power to the external device is stopped by the output control means, a change in the condition by the output setting means is accepted.
Therefore, it is possible to prevent the output voltage, the polarity, and the like from being erroneously switched during the power supply, and to supply the power correctly.

The output setting means sets the power conditions of the plurality of systems, and the power control means supplies the power of the plurality of systems, and the power of the plurality of systems is set by the output setting means. The power supply means is supplied by the control means so as to satisfy the condition. Therefore, a plurality of electronic devices can be operated by one power supply device without using an AC adapter.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a power supply device.

FIG. 2 is a diagram for explaining operation of a power supply device.

FIG. 3 is a diagram showing a configuration of another power supply device.

[Explanation of symbols]

 10, 20 power supply unit 12 switching regulator unit 13a, 13b DC-DC converter unit 14a, 14b output control unit 15a, 15b jack 16, 16N control unit 17 output setting operation unit 18 display unit 175 output on / off switch

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yoji Watanabe 1-2-1-11 Ikenohata, Taito-ku, Tokyo F-term in Iwa Corporation (reference) 5H006 AA04 BB06 CA00 CC02 DA04 DB01 DB07 DC05

Claims (3)

[Claims] A power supply unit configured to supply power to the external device; an output setting unit configured to set a condition of power supplied to the external device; and a power supplied to the external device set by the output setting unit. Control means for controlling the power supply means, and output control means for controlling the supply of power from the power supply means to the external device, so that the output control means includes: A power supply unit configured to receive a change in a condition by the output setting unit when supply of power to the external device is stopped. 2. The power supply device according to claim 1, wherein said output setting means sets an output voltage level and / or an output polarity as said power condition. 3. The power setting means sets power conditions of a plurality of systems, the power control means supplies power of a plurality of systems, and the control means controls a power supply of the plurality of systems. 2. The power supply device according to claim 1, wherein the power supply unit is controlled such that a condition set by the output setting unit is satisfied.