JPH05130054A - Detachable power supply noise filter - Google Patents

Abstract

PURPOSE:To make the filter compatible with overseas products without modifying a printer main body by unitizing a filter, a fuse, a power cord and a plug or the like used to eliminate noise transmitted through an AC power line and making the module detachable from the printer main body. CONSTITUTION:A noise filter comprising a capacitor 2 and a line filter 3 and a fuse 4 are mounted in a cartridge 1, a power cord 5 is led out from its front face and a 2-core wire plug 6 or a 3-core wire plug 7 is provided to the tip of the cord 5. The electric connection between the unitized cartridge 1 and a printer main body 9 is imiplemented by connectors 10, 11 and screws 12 are used to ensure the connection. The screw 12 is threaded to a thread hole 14 of the printer main body 9 through a thread hole 13 placed in the front face of the cartridge 1. Then the power supply circuit is designed so as to be compatible with a range of input voltages from 100ACV to 240ACV. Thus, the printer of the same design is applied to domestic and overseas applications by replacing the cartridge 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device operated by an external power source.

[0002]

2. Description of the Related Art Noise transmitted through an AC power line of an electronic device may cause the device to malfunction or hinder the normal operation of the device. To prevent this, a filter is provided on the primary side of the power supply board. It has the function of preventing external noise from the AC power supply and preventing the noise generated inside the electronic equipment from passing through the power supply line and interfering with other equipment. Usually, a capacitor or coil is inserted near the inlet of the primary side of the power supply circuit, and this is called a filter.

The voltage of the AC power source differs depending on the country. In Japan, the voltage is AC100V, but in the United States it is AC120V and in the UK it is AC240V. Also, the shape and form of the plug and the outlet are different, and the structure is two-core in Japan but three-core in the United States. Although the power supply circuit itself can sufficiently cope with the difference in the input voltage in terms of the circuit, if the voltage is different, a different filter, fuse, or power cord will be used.

As a conventional example, there is a universal power supply. The universal power supply can support the input in the range of AC100V to 240V, and the output DC35V and DC
5V etc. can be obtained. However, even if a universal power supply is used, the AC cable must be changed according to the AC power supply voltage and outlet of each country. Further, a fuse holder or a voltage changeover switch is set near the AC inlet of the electronic device, and the fuses are replaced or the switches are changed to correspond to the AC power supply voltage of each country.

FIG. 4 is an explanatory diagram of a conventional mounting method in a printer. In FIG. 4, reference numeral 18 denotes a printer housing, and a cable entered from the input unit 19 is connected to the power supply board 20 through the switch 17. The power supply board 20 is roughly divided into a filter section 21 and a power supply section 22. The fuse 4 and the noise filter (capacitor, choke coil) are mounted on the noise filter unit 21. A power cord 5 extends from the printer, and a two-core plug 6 is placed beyond it.
And a three-core plug 7 is attached.

An example of the circuit of the noise filter section 21 is shown in FIG.

The manufacturer manufactures electronic devices for the domestic market,
Currently, it is manufactured separately from overseas.

[0008]

The problem to be solved is that electronic devices are not compatible because the filters, fuses, power cords, plugs, etc. are different depending on the AC power supply voltage and the outlet depending on the country.

[0009]

SUMMARY OF THE INVENTION The present invention provides a filter, fuse, and filter for removing noise transmitted through an AC power line.
It is characterized by unitizing the power cord, plug, etc. so that it can be attached to and detached from the main body.

[0010]

Embodiment An embodiment of a printer is shown in FIG. Figure 1
FIG. 3 is a perspective view showing a noise filter of a printer embodying the present invention. The cartridge 1 is loaded with a noise filter including a capacitor 2 and a line filter 3, and a fuse 4. Power cord 5 from the front of the cartridge 1
And the tip of the cord 5 has a two-core plug 6 or a three-core plug 7. The filter element is mounted on the substrate 8, and a pattern is formed on the back side of the substrate 8.

Electrical connections between the cartridge 1 and the printer body 9 are made by connectors 10 and 11. The cartridge 1 is equipped with a female connector 10, and the printer body 9 is equipped with a male connector 11. The connector 10 of the cartridge 1 is female so that the connector does not cause an electric shock even when the plug is inserted into an outlet. The connector has a three-core structure with a ground terminal regardless of the plug shape. This allows you to replace the cartridge,
When the connector shape is the same and a cartridge with a two-core plug is used, the ground terminal of the connector does not play a role.

Screws 12 are used to ensure the connection between the cartridge 1 and the printer body 9. The screw 12 is fixed to the screw hole 14 in the receiving port of the printer body 9 through the screw hole 13 on the front surface of the cartridge 1. Therefore, the noise filter portion can be easily replaced by removing the screw 12.

The power supply circuit has an input voltage of AC 100 V to A
It is designed to support up to C240V. Therefore, if the cartridge 1 is replaced, the printer of the same main body can be used both domestically and overseas.

FIG. 2 shows another embodiment of the present invention, which is a removable power noise filter having an inlet inserted between the power cord and the filter. In FIG. 2, 1 is the cartridge described in FIG. 1, 15 is an outlet, and 16 is an inlet. In this embodiment, it is not necessary to replace the filter or fuse.

FIG. 3 shows a detachable power source noise filter in which a switch is inserted between the power cord and the filter according to still another embodiment of the present invention. In FIG. 3, 1 is the cartridge described in FIG. 1, and 17 is a power switch.

[0016]

The main body of the electronic device can be manufactured to be the same for both domestic and overseas specifications. And by simply replacing this removable cartridge, you can get the convenience that the electronic device can be used both domestically and overseas.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing another embodiment of the present invention.

FIG. 3 is a perspective view showing still another embodiment of the present invention.

FIG. 4 is an explanatory diagram of a conventional noise filter.

FIG. 5 is a conventional noise filter circuit diagram.

[Explanation of symbols] 1 cartridge 2 capacitor 3 line filter 4 fuse 5 power cord 6 two-core plug 7 three-core plug 8 substrate 9 printer body 10 connector (female) 11 connector (male) 12 screw 13 screw hole 14 screw hole 15 Outlet 16 Inlet 17 Power switch 18 Printer housing 19 Cord inlet 20 Power supply board 21 Noise filter section 22 Power supply section

Claims (3)

[Claims] 1. A detachable power supply noise filter, wherein a filter for removing noise transmitted through an AC power supply line of an electronic device, a fuse, a power supply cord and a plug are unitized and can be attached and detached from a main body. 2. The removable power noise filter according to claim 1, wherein an inlet is inserted between the power cord and the filter. 3. A removable power noise filter according to claim 1, wherein a switch is inserted between the power cord and the filter.