JPH10247570A - Ac adapter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an plural-voltage-treating AC adapter device which has a simple structure and is manufactured at low cost. SOLUTION: The AC adapter device 100 includes a switching-type AC adapter body 3 to which AC power is supplied, a DC code 4 which expands from the AC adapter body 3, and a DC plug 5 which is attached to the end of the DC code 4. The DC plug 5 consists of its back end 5a which is fixed to the DC code 4, and its front end 5b which is removably attached to the back end 5a, the plug's front end 5b has a built-in resistance element which has resistance specific to DC voltage specification of the front end 5b, and the resistance element forms a part of a resistance partial potential circuit for detecting output voltage through a feedback system of a switch regulator circuit which is installed in the AC adapter body 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AC adapter device for generating a DC voltage by connecting to a commercial power supply, and in particular, to various D adapters only by changing the tip of a DC plug.
The present invention relates to a switching type AC adapter device adapted to comply with C voltage specifications.

[0002]

2. Description of the Related Art Switching type AC adapter devices are widely used for supplying power to DC-operated electric products, for example, portable personal computers, portable tape players, etc., because of their small loss and small size. Have been.

[0003] Each of these electric appliances has a unique DC.
Voltage specifications exist. Therefore, conventionally, it has been necessary to prepare an AC adapter device suitable for the DC voltage specification for each electric product.

Accordingly, for example, Japanese Patent Application Laid-Open No. 04-34757
As disclosed in Japanese Unexamined Patent Publication No. 8 (1994), there has been proposed a multi-voltage compatible AC adapter device capable of switching a DC output voltage to two or more by operating a switch incorporated in an AC adapter main body.

[0005]

However, such a conventional multi-voltage type AC adapter device requires a separate switch component for voltage switching, and thus has a complicated structure and cost. It was difficult to put it to practical use. In addition, some of the DC jacks on the side of the electrical appliance into which the DC plug is to be inserted have dimensions specific to the DC voltage specification. In such a case, the output voltage is switched to switch the electrical appliance. Even when conforming to the voltage specifications, due to the difference in dimensions between the DC plug and DC jack,
After all, there was a problem that it could not be used.

The present invention relates to a conventional multi-voltage AC type.
It is an object of the present invention to solve the above-mentioned problems in an adapter device, and an object of the present invention is to provide an AC adapter device capable of handling a plurality of voltages, which has a simple structure and can be manufactured at low cost.

Another object of the present invention is to provide a DC
Even if the DC jack of the appliance into which the plug is to be inserted has a dimension specific to the voltage specification, simply replace the DC plug with a dimension conforming to the voltage specification. It is an object of the present invention to provide an AC adapter device capable of outputting a voltage and adapted to a plurality of voltages.

[0008]

According to a first aspect of the present invention, there is provided a switching type AC adapter main body to which AC power is supplied, and a D extending from the AC adapter main body.
C code and DC attached to the end of the DC code
An AC adapter device having a plug,
The plug includes a plug rear end fixedly attached to the DC cord side and a plug front end detachably attached to the plug rear end. The plug front end includes the plug front end. A resistance element having a resistance value specific to the DC voltage specification is built in, and the resistance element is an output voltage detection resistance voltage dividing circuit interposed in a feedback system of a switching regulator circuit built in the AC adapter body. Of the AC adapter device.

According to the first aspect of the present invention, a DC output voltage that meets the DC voltage specification can be obtained only by replacing the plug tip in accordance with the required DC voltage specification. .

[0010] The invention according to claim 2 of the present application is the AC adapter device according to claim 1, wherein the plug tip has a dimension specific to its DC voltage specification.

According to the second aspect of the present invention, even when the DC jack on the side of the electric appliance into which the DC plug is to be inserted has a dimension unique to the voltage specification, the voltage specification is not satisfied. By simply replacing the DC plug with a suitable size, a DC voltage matching the DC plug can be obtained immediately.

According to a third aspect of the present invention, the plug rear end and the plug front end are male and female having the plug rear end side as a female part and the plug front end side as a male part. 2. The AC adapter device according to claim 1, wherein the AC adapter device is detachably connected by a connection tool.

According to the third aspect of the present invention, since the charged portion is not exposed from the rear end of the plug, the electrical safety is excellent.

[0014]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a schematic explanatory view schematically showing the entire configuration of the AC adapter device according to the present invention. As shown in FIG.
A switching type AC adapter main body 3 to which AC power is supplied via an AC plug 1 and an AC cord 2, a DC cord 4 extending from the AC adapter main body 3,
And a DC plug 5 attached to the end of the cord 4.

The DC plug 5 is connected to the DC cord 4
A plug rear end 5a is fixedly attached to the plug, and a plug front end 5b is detachably attached to the plug rear end 5a.

FIG. 2 shows details of the plug rear end portion 5a and the plug front end portion 5b. As shown in the drawing, the plug tip 5b has a built-in resistor element 6 having a resistance value specific to the DC voltage specification of the plug tip.
The plug rear end portion 5a and the plug front end portion 5b are detachably connected by a male / female connector 7 having a female portion on the plug rear end portion 5a side and a male portion on the plug front end portion 5b side. .
In addition, plug tip 5b has dimensions that are specific to its DC voltage specification. Here, “dimensions” are dimensions corresponding to jacks of each voltage specification, and specifically, dimensions of a sleeve, a center electrode, an insulating collar, and the like.

FIG. 3 shows an example of a switching regulator circuit built in the AC adapter body 3. In the figure, 8 is a commercial 100 V AC power supply, 9 is a rectifying and smoothing circuit for rectifying and smoothing the AC power supply voltage and converting it to a DC voltage, 10 is a transistor for switching the DC voltage obtained from the rectifying and smoothing circuit 9, and 11 is Transistor 1
A control circuit for supplying a switching pulse train to the base of 0, a transformer 12 for taking out an AC component obtained by switching, and a rectifying / smoothing 13 for rectifying / smoothing the AC component taken out by the transformer 12 and converting it into a target DC voltage. In the circuit, a diode 13a, capacitors 13b, 13
c and a coil 13d.

The DC voltage thus obtained is detected by a resistance voltage dividing circuit composed of the resistance elements 6, 14, and 15. In other words, this resistance voltage dividing circuit is constituted by a so-called series-parallel circuit in which the resistance elements 6, 14 and the resistance element 15 connected in parallel to each other are connected in series, and a detection voltage is applied to a connection point P of these resistance elements. Will be obtained. In other words, the resistance element 6 built in the plug tip 5a described above constitutes a part of the output voltage detection resistance voltage dividing circuit interposed in the feedback system of the switching regulator circuit. Become.

The voltage detected by the above-described resistance voltage dividing circuit is:
The error is compared with a predetermined reference voltage by an error amplifier 16 (for example, realized by a TL431 or the like, a voltage regulator IC manufactured by TI), and a current corresponding to the error is supplied to the control circuit 11 via the photocoupler 18. Feedback will be given. Then, the output pulse train is controlled by the operation of the control circuit 11, and the switching mode of the transistor 10 is changed. As a result, the output voltage of the switching regulator circuit is always kept constant. Reference numeral 17 denotes a current limiting resistor.

According to the above configuration, the plug tip 5b has a built-in resistance element 6 having a resistance value specific to the DC voltage specification of the plug tip 5b. Since it constitutes a part of the output voltage detecting resistor voltage dividing circuit interposed in the feedback system of the switching regulator circuit built in the AC adapter body 3, the plug tip is adapted to the required DC voltage specification. A DC output voltage that meets the DC voltage specification can be obtained only by replacing the unit 5b. In addition, DC
Increase the number of wires by one to the cord, and add the plug tip 5b
Since the resistance element 6 incorporated in the device is connected, the structure is extremely simple and the device can be manufactured at low cost.

Since the plug tip 5b has a dimension specific to the DC voltage specification, the DC jack on the side of the electrical product into which the DC plug is to be inserted has a dimension specific to the voltage specification. In that case, just replace the DC plug with the size that matches the voltage specification,
Immediately, a matching DC voltage can be obtained.

Further, the plug rear end 5b and the plug front end 5a are detachably attached to each other by a male / female connector 7 having the plug rear end 5a side as a female part and the plug front end 5b side as a male part. Since it is connected, the charged portion is not exposed from the plug rear end portion 5a, so that the electrical safety is excellent.

[0024]

As is apparent from the above description, according to the present invention, the structure is simple and the manufacturing can be performed at low cost.
Even if the DC jack of the appliance into which the plug is to be inserted has a dimension specific to the voltage specification, simply replace the DC plug with a dimension conforming to the voltage specification. It is possible to provide a multiple voltage compatible AC adapter device that outputs a voltage.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view schematically showing an overall configuration of an AC adapter device according to the present invention.

FIG. 2 is a diagram showing a relationship between a plug rear end portion and a plug front end portion in detail.

FIG. 3 is a diagram illustrating an example of a switching regulator circuit built in an AC adapter main body.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 AC adapter device 1 AC plug 2 AC cord 3 AC adapter main body 4 DC cord 5 DC plug 5 a Plug rear end 5 b Plug tip 6 Resistance element 7 Male and female connector 8 AC power supply 9 Rectifying smoothing circuit 10 Transistor 11 Control circuit 12 Transformer 13 Rectifier / smoothing circuit 14 Resistor 15 Resistor 16 Error amplifier 17 Current limiting resistor 18 Photocoupler P Connection point of resistor voltage divider

Claims (3)

[Claims] 1. A switching type AC adapter main body to which AC power is supplied, a DC cord extending from the AC adapter main body, and a D cord attached to a tip of the DC cord.
An AC adapter device having a C plug, wherein the DC plug comprises a plug rear end fixedly attached to the DC cord side and a plug front end detachably attached to the plug rear end. The plug tip has a built-in resistance element having a resistance value specific to the DC voltage specification of the plug tip,
The AC adapter device, wherein the resistance element constitutes a part of an output voltage detection resistance voltage dividing circuit interposed in a feedback system of a switching regulator circuit built in the AC adapter body. 2. The AC adapter device according to claim 1, wherein the plug tip has a dimension unique to its DC voltage specification. 3. The plug rear end and the plug front end are detachably connected by a male / female connector having a plug rear end side as a female part and a plug front end side as a male part. The AC adapter device according to claim 1, wherein: