JPS596727A - Power source inputting device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION +8) Technical Field of the Invention The present invention relates to a power input device that automatically grounds a grounding point of a power input section of a device that requires distinction between the grounding side of the input.

(b) Background of the Technology In devices that connect an input power source through a plug, the user is generally not particularly aware of the distinction between the grounded and non-grounded electrodes of the plug; If the device requires a distinction between the grounding side, or if there is a risk of electric shock or leakage, two types of troubles may occur.

(C) Conventional technology and problems Conventionally, in order to deal with the above problems, in cases where the mating socket of the plug is installed in a dedicated specific location, the plug's insertion blades have been made asymmetrical. In some cases, a third plug-in blade is provided, or characters such as right or left are added to indicate the connection direction, but these methods are used only when using a specific device or plug-in socket. It lacked generality.

Additionally, in some conventional devices, if the grounding of the input power source was grounded in the opposite direction to the specified polarity, there was an example in which a light emitting device such as a glow discharge tube was used to indicate the polarity, but it did not have any other function. Ta.

(d) Purpose of the Invention The present invention has been made in view of the above-mentioned points, and is a device that connects an input power source via a plug and requires a distinction between the ground side of the input, which is connected to the ground side. An object of the present invention is to provide a power input device that automatically maintains the potential of the reference point of the power input section of the device to be used at the ground potential at all times regardless of whether the plug is connected or not.

+81 Structure of the Invention The object of the present invention described above is to connect the power input section of one device in a power input device for a device that connects an input power source via a plug and requires distinction of the ground side of the power input. a detection circuit that detects the potential difference between the point and the ground potential; ii.
This can be easily achieved by providing a power input device characterized by comprising a circuit driven by a detection circuit to switch the polarity of the power supply wiring between the power input section and the plug.

(f) Embodiments of the invention Examples of the invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram showing a power input device based on the present invention. Input power supply l (usually AC toov, 200V)
It is assumed that wire 2 of the power supply line is grounded.

The input power source 1 is connected to a plug socket 3 and supplies power to a power input section 5 of nine devices 4 via a plug 6. The device 4 requires distinction of the polarity of the input power source, and the grounding side of the input section 5 is indicated by a grounding point 7. Conventionally, the plug 6 was directly connected to the power input section 5 of the device 4, but according to the present invention, a new polarity switching circuit 8.
A detection circuit 9 and a drive circuit 10 are provided.

The detection circuit 9 has a ground electrode 11 and is reliably grounded, and detects the potential difference at the ground point 7 of the power input section 5 with this as a reference. The polarity switching circuit 8 has a normal state when the grounding point 7 is on the grounding side, and when it is detected that the grounding point 7 is not on the grounding side, the polarity switching circuit 8 is driven via the drive circuit IO to switch the input power. 1 to keep the ground point 7 of the power input section 5 on the ground side.

FIG. 2 is a configuration diagram showing the simplest practical circuit. As shown in the figure, a transfer microswitch 12 is provided. 1. Close one end of the electromagnetic solenoid 13 with the polarity switch. Make sure to ground it through diode D and use it as a reference for ground potential.

The other end is connected to the wiring 2a via the polarity switch M.
Connect to. Two sets of transfer microswitches 12
Contacts A, , A, plug plug 6 into socket 3
When the wiring 2a is on the ground side as a result of being inserted into the grounding point 7, the wiring 2a is connected to the grounding point 7.

However, if the plug 6 is connected with the opposite polarity to the input power supply and the wiring 28 is on the non-grounded side, the electromagnetic solenoid 1
Since the input power supply voltage is directly applied to 3, the electromagnetic solenoid 13 is activated, and the two sets of transfer contacts are connected to the opposite sides B, , B, so that the ground point 7 is still maintained at the ground potential. I can do it.

Polarity changeover switch M attached to electromagnetic solenoid 13
,,M, are used to determine the direction of movement of the driven body in conjunction with the driven body within the electromagnetic solenoid 13. Of course,
This driven body also operates in conjunction with the micro switch 12, and has a structure in which the polarity can be switched.

(gl. Effect of the Invention 9) As is clear from the above explanation, according to the power input device according to the present invention, even if the plug 6 is unconsciously connected to the plug socket 3 of the input power source without considering its polarity, one device cannot be connected. Since the polarity of the input power supply voltage applied to 4 can be automatically maintained at a predetermined polarity, problems such as electric shock, leakage, or improper polarity can be avoided.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing the configuration of a power input device according to an embodiment of the present invention, and FIG. 2 is a configuration diagram of a specific embodiment using an AC electromagnetic solenoid. In the figure, l is the input power source, 2 is the ground side wiring of the power supply wiring for the human power source, 3 is the plug socket, 4 is the device, 5 is the input part of the device, 6 is the plug, 7 is the ground point, and 8 is the polarity switch. circuit, 9 is a detection circuit. 10 is a drive circuit, 11 is a grounding point of a detection circuit, 12 is a transfer microswitch, 13 is an electromagnetic solenoid,
(A, , A,) (B, , B,)' indicates a switching contact, M, , M indicates a polarity switching switch, DC, and diode, respectively.

Claims (1)

[Scope of Claims] In a power input device for a device that connects an input power source via a plug and requires distinction between the ground side of the power input and the ground potential of the ground point of the power input section of nine devices and the and a detection circuit that detects the potential difference between. A power input device comprising a circuit driven by the detection circuit to switch the polarity of a power supply wiring between the power input section and the plug.