WO2024181632A1 - Insulation transformer - Google Patents

Abstract

According to an embodiment, disclosed is an insulation transformer in which a primary coil and a secondary coil each having two terminals are doubly arranged inside a core while being insulated from each other and wound separately on a bobbin, the insulation transformer further comprising: a bracket supporting the insulation transformer; first and second PCBs fixed to both sides of the top surface of the bracket and having input terminals and output terminals on top surfaces of the first and second PCBs, respectively; first and second socket connectors that are of a 6-pin type and are each connected to the first PCB circuit; a first plug connector of a 6-pin type that is selectively inserted into one of the first and second socket connectors to connect a circuit in parallel or series; third and fourth socket connectors each connected to the second PCB circuit; and a second plug connector of a 6-pin type that is selectively inserted into one of the third and fourth socket connectors to connect a circuit in parallel or series.

Description

Insulating transformer

The present invention relates to an insulating transformer that changes the value of an alternating voltage or current by using an electromagnetic induction phenomenon, and more specifically, to an insulating transformer using a detachable connector that prevents a short circuit phenomenon caused by momentary contact when switching an electric circuit with a sliding-type changeover switch, and also reduces work man-hours, thereby reducing production costs.

In general, an insulation transformer, which is used to step up or step down commercial voltage to the rated voltage of an electronic device, has a core made of laminated thin steel plates containing silicon, with the primary and secondary coils wound separately, so that the side that receives AC power (the primary side) and the side that supplies power (the secondary side) are insulated.

When an AC commercial voltage is applied to the primary coil of this type of insulating transformer, magnetic flux is generated through electromagnetic mutual induction, which is transmitted to the core and a voltage proportional to the number of turns is induced in the secondary coil. This induced voltage in the secondary coil is used as the driving voltage for electronic devices.

However, conventional insulating transformers had a problem in that their service life was shortened because the transformer characteristics transmitted to the output terminal changed due to the microcurrent that continued to flow even when not in use.

To solve this problem, Korean Patent Publication No. 10-1996954 discloses an insulating transformer having a structure in which a switching switch is connected to each of the input side and the output side, and the output voltage can be freely changed, such as by lowering the voltage according to manual operation of the switching switch.

An insulating transformer according to an embodiment of the present invention can prevent a short circuit phenomenon caused by momentary contact when switching an electric circuit with a sliding-type changeover switch. In addition, the present invention has the effect of reducing the work man-hours and thus reducing production costs.

An insulating transformer according to an embodiment of the present invention is an insulating transformer in which a primary coil and a secondary coil, each having two terminals, are wound separately on a bobbin in a state of being insulated from each other and are double-arranged on the inside of a core. The insulating transformer includes a bracket that supports the insulating transformer, first and second PCBs that are fixed to both sides of an upper surface of the bracket and have input terminals and output terminals on the upper surface, first and second socket connectors of 6-pin type respectively connected to a circuit of the first PCB, a first plug connector of 6-pin type selectively inserted into one of the first and second socket connectors to connect the circuits in parallel or series, third and fourth socket connectors respectively connected to a circuit of the second PCB, and a second plug connector of 6-pin type selectively inserted into one of the third and fourth socket connectors to connect the circuits in parallel or series.

One embodiment may further include a fifth socket connector connected to the first PCB circuit, a third plug connector fitted into the fifth socket connector and electrically connecting the primary coil and the first PCB circuit, a sixth socket connector connected to the second PCB circuit, and a fourth plug connector fitted into the sixth socket connector and electrically connecting the secondary coil and the second PCB circuit.

In addition, in one embodiment, the first socket connector may be electrically connected to the second terminal of the first winding part of the primary coil of the insulating transformer and electrically connected to the third terminal of the second winding part of the primary coil of the insulating transformer, but may be wired in a state where the second terminal of the first winding part of the primary coil of the insulating transformer and the third terminal of the second winding part of the primary coil of the insulating transformer are not connected to each other.

In addition, in one embodiment, the second socket connector may be electrically connected to the first and second terminals of the first winding section of the primary coil of the insulating transformer, respectively, and electrically connected to the third and fourth terminals of the second winding section of the primary coil of the insulating transformer, respectively, but may be wired in a state where the first and second terminals of the first winding section of the primary coil of the insulating transformer and the third and fourth terminals of the second winding section of the primary coil of the insulating transformer are not interconnected.

In addition, in one embodiment, the third socket connector may be electrically connected to the sixth terminal of the third winding section of the secondary coil of the insulating transformer and electrically connected to the seventh terminal of the fourth winding section of the secondary coil of the insulating transformer, but may be wired in a state where the sixth terminal of the third winding section of the secondary coil of the insulating transformer and the seventh terminal of the fourth winding section of the secondary coil of the insulating transformer are not interconnected.

In addition, in one embodiment, the fourth socket connector may be wired so as to be electrically connected to the fifth and sixth terminals of the third winding section of the secondary coil of the insulating transformer, respectively, and electrically connected to the seventh and eighth terminals of the fourth winding section of the secondary coil of the insulating transformer, respectively, but the fifth and sixth terminals of the third winding section of the secondary coil of the insulating transformer and the seventh and eighth terminals of the fourth winding section of the secondary coil of the insulating transformer are not interconnected.

In addition, in one embodiment, the first plug connector may be cross-connected so that, when connected to the first socket connector to connect a circuit, the second terminal of the first winding section of the primary coil of the insulating transformer and the third terminal of the second winding section of the primary coil of the insulating transformer are mutually connected, and when connected to the second socket connector to connect a circuit, the second terminal of the first winding section of the primary coil of the insulating transformer and the fourth terminal of the second winding section of the primary coil of the insulating transformer are mutually connected, and the first terminal of the first winding section of the primary coil of the insulating transformer and the third terminal of the second winding section of the primary coil of the insulating transformer are mutually connected.

In addition, in one embodiment, the second plug connector may be cross-connected so that, when connected to the third socket connector to connect a circuit, the sixth terminal of the third winding section of the secondary coil of the insulating transformer and the seventh terminal of the fourth winding section of the secondary coil of the insulating transformer are mutually connected, and when connected to the fourth socket connector to connect a circuit, the sixth terminal of the third winding section of the secondary coil of the insulating transformer and the eighth terminal of the fourth winding section of the secondary coil of the insulating transformer are mutually connected, and the fifth terminal of the third winding section of the secondary coil of the insulating transformer and the seventh terminal of the fourth winding section of the secondary coil of the insulating transformer are mutually connected.

The present invention is a sliding-type changeover switch that can prevent a short circuit phenomenon caused by momentary contact when switching an electric circuit.

In addition, unlike conventional methods, the electric circuit is configured using a PCB, and since the primary and secondary coils consist of a total of four terminals, the number of man-hours required for the manufacturing process can be reduced, thereby reducing production costs.

Figure 1 is a perspective view showing an insulating transformer according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the first and second plug connectors, which are among the main elements constituting the insulating transformer according to an embodiment of the present invention, in an exploded state.

FIG. 3 is a wiring diagram showing the connection relationship of an electric circuit when the input terminal (200 to 230 V) and the output terminal (200 to 230 V) of an insulating transformer according to an embodiment of the present invention are electrically separated and used.

FIG. 4 is a wiring diagram showing the connection relationship of an electric circuit when a voltage is lowered to send a voltage lower than the input side of an insulating transformer according to an embodiment of the present invention to the output side.

FIG. 5 is a wiring diagram showing the connection relationship of an electric circuit when the input terminal (100 to 115 V) and the output terminal (100 to 115 V) of an insulating transformer according to an embodiment of the present invention are electrically separated and used.

FIG. 6 is a wiring diagram showing the connection relationship of an electric circuit when a voltage is raised to send a higher voltage than the input side of an insulating transformer according to an embodiment of the present invention to the output side.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the attached drawings.

Prior to this, it should be noted that the terms described below have been defined in consideration of their functions in the present invention, and should be interpreted as concepts consistent with the technical idea of the present invention and meanings commonly used or commonly recognized in the relevant technical field.

In addition, if it is determined that a detailed description of a known function or configuration related to the present invention may obscure the gist of the present invention, the detailed description is omitted.

The drawings attached herein may be exaggerated or simplified in some parts to facilitate the explanation and understanding of the composition and operation of the technology, and it is to be noted that each component in the drawings does not exactly match the actual size and shape.

In addition, the term and/or in this specification means a combination of a plurality of related described items or including any item among a plurality of related described items, and when it is said that a part includes a certain component, this does not mean excluding other components, unless specifically stated otherwise, but rather that other components may be included.

That is, the terms “include” or “have” as used herein mean that there is a feature, number, step, process, operation, component, part, or a combination thereof, but should be understood to not exclude the possibility of the presence or addition of one or more other features, numbers, steps, processes, operations, components, parts, or combinations thereof.

Meanwhile, the meaning of "part" and "unit" used in the present invention means a unit or module type that processes at least one function or certain operation intended for a device or system, and this can be implemented by means such as hardware or software, or a combination of hardware and software, or a device or assembly capable of performing independent operations.

In addition, the terms top, bottom, upper surface, lower surface, or upper, lower, upper side, lower side, front/back, left/right, etc. used in the present invention are used for convenience in distinguishing the relative positions of each component. For example, the upper part in a drawing may be named or referred to as the upper part and the lower part as the lower part, and the length direction may be named or referred to as the front/back direction, and the width direction may be named or referred to as the left/right direction.

Additionally, the terms first, second, etc. used in the present invention can be used to describe various components. That is, the terms first, second, etc. can be used only for the purpose of distinguishing one component from another component.

As illustrated in FIGS. 1 to 6, an insulating transformer according to an embodiment of the present invention has a primary coil (1) and a secondary coil (2), each having two terminals, wound separately on a bobbin (3) in a mutually insulated state and arranged in duplicate on the inside of a core (4).

That is, the primary coil (1) is composed of a first winding part (10) having first and second terminals (11)(12) and a second winding part (20) having third and fourth terminals (23)(24), and the secondary coil (2) is composed of a third winding part (30) having fifth and sixth terminals (35)(36) and a fourth winding part (40) having seventh and eighth terminals (47)(48).

Of course, a temperature fuse (bimetal) or an overheating prevention device (thermal protector) that automatically cuts off the electric circuit of the first terminal (11) of the first winding section (10) to prevent overheating when the temperature rises above a certain standard may be provided.

The main elements constituting the insulating transformer according to the embodiment of the present invention include a bracket (100), a first PCB (110), a second PCB (120), a first socket connector (130), a second socket connector (140), a first plug connector (150), a third socket connector (160), a fourth socket connector (170), and a second plug connector (180).

The bracket (100) is formed by stacking a bobbin (3) on which a primary coil (1) and a secondary coil (2) are wound while being insulated from each other, and a core (4) with the bobbin (3) inserted into the inner space.

The first PCB (110) is made of a thin plate that forms an electric circuit with a conductor pattern and is fixed to one side of the upper surface of the bracket (100).

And, on the upper edge of the first PCB (110), an input terminal (111) having a plurality of connecting screws for connecting wires is provided.

In addition, a 6-pin type fifth socket connector (112) is connected to the circuit of the first PCB (110), and a 6-pin type third plug connector (113) that electrically connects the primary coil (1) and the circuit of the first PCB (110) is fitted into the fifth socket connector (112).

The second PCB (120) is made of a thin plate that forms an electric circuit with a conductor pattern and is fixed to the other side (opposite side) of the upper surface of the bracket (100).

And, on the upper edge of the second PCB (120), an output terminal (121) having a plurality of connecting screws for connecting wires is provided.

In addition, a 6-pin type 6th socket connector (122) is connected to the 2nd PCB (120) circuit, and a 6-pin type 4th plug connector (123) that electrically connects the secondary coil (2) and the 2nd PCB (120) circuit is fitted into this 6th socket connector (122).

The first socket connector (130) is composed of a 6-pin type female connector and is connected to the first PCB (110) circuit.

That is, the first socket connector (130) is electrically connected to the second terminal (12) of the first winding part (10) of the primary coil (1) through the first PCB (110) circuit, and is also electrically connected to the third terminal (23) of the second winding part (20) of the primary coil (1).

In addition, the second terminal (12) of the first winding section (10) and the third terminal (23) of the second winding section (20) are wired so as not to be connected to each other.

The second socket connector (140) is composed of a 6-pin type female connector and is connected to the first PCB (110) circuit.

That is, the second socket connector (140) is electrically connected to the first and second terminals (11) (12) of the first winding part (10) of the primary coil (1), respectively, and is also electrically connected to the third and fourth terminals (23) (24) of the second winding part (20) of the primary coil (1), respectively.

In addition, the first and second terminals (11)(12) of the first winding section (10) and the third and fourth terminals (23)(24) of the second winding section (20) are wired so as not to be connected to each other.

The first plug connector (150) is configured as a 6-pin type male connector that can be selectively inserted into either the first or second socket connectors (130)(140) to connect the first PCB (110) circuit in parallel or series.

That is, the first plug connector (150) has a structure in which rows of pins 1 to 3 and rows of pins 4 to 6 are arranged in parallel so as to electrically connect two terminals or four terminals to each other, and among the six pins, pins 1 and 4 are connected with wires, and pins 3 and 4 are connected with wires.

For example, when the first plug connector (150) is inserted into the first socket connector (130) to connect the circuit, the second terminal (12) of the first winding part (10) of the primary coil (1) and the third terminal (23) of the second winding part (20) of the primary coil (1) can be cross-connected to each other.

In addition, when the first plug connector (150) is inserted into the second socket connector (140) to connect the circuit, the second terminal (12) of the first winding part (10) of the primary coil (1) and the fourth terminal (24) of the second winding part (20) of the primary coil (1) are mutually connected, and at the same time, the first terminal (11) of the first winding part (10) of the primary coil (1) and the third terminal (23) of the second winding part (20) of the primary coil (1) are mutually connected.

The third socket connector (160) is composed of a 6-pin type female connector and is connected to the second PCB (120) circuit.

That is, the third socket connector (160) is electrically connected to the sixth terminal (36) of the third winding part (30) of the secondary coil (2), and is also electrically connected to the seventh terminal (47) of the fourth winding part (40) of the secondary coil (2).

In addition, the 6th terminal (36) of the 3rd winding section (30) and the 7th terminal (47) of the 4th winding section (40) are wired in a non-connected state.

The fourth socket connector (170) is composed of a 6-pin type female connector and is connected to each circuit of the second PCB (120).

That is, the fourth socket connector (170) is electrically connected to the fifth and sixth terminals (35) (36) of the third winding section (30) of the secondary coil (2), respectively, and is also electrically connected to the seventh and eighth terminals (47) (48) of the fourth winding section (40) of the secondary coil (2), respectively.

In addition, the fifth and sixth terminals (35)(36) of the third winding section (30) and the seventh and eighth terminals (47)(48) of the fourth winding section (40) are wired so as not to be interconnected.

The second plug connector (180) is configured as a 6-pin type male connector that can be selectively inserted into either the third or fourth socket connector (160)(170) to connect the second PCB (120) circuit in parallel or series.

That is, the second plug connector (180) has a structure in which rows of pins 1 to 3 and rows of pins 4 to 6 are arranged in parallel so as to electrically connect two terminals or four terminals to each other, and among the six pins, pins 1 and 4 are connected with wires, and pins 3 and 4 are connected with wires.

For example, when the second plug connector (180) is inserted into the third socket connector (160) to connect the circuit, the sixth terminal (36) of the third winding part (30) of the secondary coil (2) and the seventh terminal (47) of the fourth winding part (40) of the secondary coil (2) can be cross-connected.

In addition, the second plug connector (180) can be cross-connected so that when connecting the circuit by inserting it into the fourth socket connector (170), the sixth terminal (36) of the third winding part (30) of the secondary coil (2) and the eighth terminal (48) of the fourth winding part (40) of the secondary coil (2) are mutually connected, and at the same time, the fifth terminal (35) of the third winding part (30) of the secondary coil (2) and the seventh terminal (37) of the fourth winding part (40) of the secondary coil (2) are mutually connected.

Here, the first and second socket connectors (130)(140), the first plug connector (150), the third and fourth socket connectors (160)(170), and the second plug connector (180) may be configured to have a structure having a locking device, such as a latch, to prevent them from being detached when fitted into their respective housings.

In addition, it is preferable that the first and second socket connectors (130)(140), the first plug connector (150), the third and fourth socket connectors (160)(170), and the second plug connector (180) be formed of a 6-pin type connector that connects wire to wire.

In this way, the insulation transformer according to an embodiment of the present invention implements an electric circuit by selectively attaching and detaching the first and second plug connectors (150)(180) to one of the first and second socket connectors (130)(140) and the third and fourth socket connectors (160)(170), thereby enabling stable use without a short circuit phenomenon occurring due to momentary contact when switching the electric circuit, unlike in the past.

The main functions and operating principles of the insulating transformer according to the embodiment of the present invention configured as described above are as follows.

First, as shown in Fig. 3, by inserting the first plug connector (150) into the first socket connector (130) and cross-connecting the second terminal (12) of the first winding part (10) of the primary coil (1) and the third terminal (23) of the second winding part (20) of the primary coil (1) so that they are mutually connected, the first socket connector (130) and the second socket connector (140) are connected in series.

In addition, by inserting the second plug connector (180) into the third socket connector (160) and cross-connecting the sixth terminal (36) of the third winding part (30) of the secondary coil (2) and the seventh terminal (47) of the fourth winding part (40) of the secondary coil (2) so that they are mutually connected, the third socket connector (160) and the fourth socket connector (170) are connected in series.

By doing this, the input terminal, which inputs a voltage of 200 to 230 V, and the output terminal, which outputs a voltage of 200 to 230 V, can be electrically separated and used.

Meanwhile, as shown in Fig. 4, when the first plug connector (150) is inserted into the first socket connector (130) so that the second terminal (12) of the first winding part (10) of the primary coil (1) and the third terminal (23) of the second winding part (20) of the primary coil (1) are cross-connected, the first socket connector (130) and the second socket connector (140) are connected in series.

In addition, by inserting the second plug connector (180) into the fourth socket connector (170), the sixth terminal (36) of the third winding part (30) of the secondary coil (2) and the eighth terminal (48) of the fourth winding part (40) of the secondary coil (2) are connected to each other, and also the fifth terminal (35) of the third winding part (30) of the secondary coil (2) and the seventh terminal (37) of the fourth winding part (40) of the secondary coil (2) are connected to each other, and then the third socket connector (160) and the fourth socket connector (170) are connected in parallel.

By doing this, a voltage of 100 to 115 V, which is lower than the input voltage of 200 to 230 V, can be sent to the output side.

Meanwhile, as shown in Fig. 5, when the first plug connector (150) is inserted into the second socket connector (140) so that the second terminal (12) of the first winding part (10) of the primary coil (1) and the fourth terminal (24) of the second winding part (20) of the primary coil (1) are mutually connected, and also the first terminal (11) of the first winding part (10) of the primary coil (1) and the third terminal (23) of the second winding part (20) of the primary coil (1) are mutually connected, the first socket connector (130) and the second socket connector (140) are connected in parallel.

In addition, by inserting the second plug connector (180) into the fourth socket connector (170), the sixth terminal (36) of the third winding part (30) of the secondary coil (2) and the eighth terminal (48) of the fourth winding part (40) of the secondary coil (2) are connected to each other, and also the fifth terminal (35) of the third winding part (30) of the secondary coil (2) and the seventh terminal (37) of the fourth winding part (40) of the secondary coil (2) are connected to each other, and then the third socket connector (160) and the fourth socket connector (170) are connected in parallel.

By doing this, the input terminal, which inputs a voltage of 100 to 115 V, and the output terminal, which outputs a voltage of 100 to 115 V, can be electrically separated and used.

Meanwhile, as shown in Fig. 6, when the first plug connector (150) is inserted into the second socket connector (140) so that the second terminal (12) of the first winding part (10) of the primary coil (1) and the fourth terminal (24) of the second winding part (20) of the primary coil (1) are mutually connected, and also the first terminal (11) of the first winding part (10) of the primary coil (1) and the third terminal (23) of the second winding part (20) of the primary coil (1) are mutually connected, the first socket connector (130) and the second socket connector (140) are connected in parallel.

In addition, by inserting the second plug connector (180) into the third socket connector (160) and cross-connecting the sixth terminal (36) of the third winding part (30) of the secondary coil (2) and the seventh terminal (47) of the fourth winding part (40) of the secondary coil (2) so that they are mutually connected, the third socket connector (160) and the fourth socket connector (170) are connected in series.

By doing this, a voltage of 200 to 230 V, which is higher than the input voltage of 100 to 115 V, can be sent to the output side.

Meanwhile, the present invention is not limited to the above-described embodiment and the attached drawings, and can be variously modified and applied in various ways not illustrated within the scope that does not depart from the technical spirit of the present invention, and it is obvious to a person having ordinary skill in the art to which the present invention pertains that it can be widely applied by changing each component and equivalent other embodiment.

Therefore, the contents related to modifying and applying the technical features of the present invention should be interpreted as being included within the technical idea and scope of the present invention.

[drawing symbol]

1: Primary coil, 2: Secondary coil, 100: Bracket, 110: First PCB, 120: Second PCB, 130: First socket connector, 140: Second socket connector, 150: First plug connector, 160: Third socket connector, 170: Fourth socket connector, 180: Second plug connector

Claims (3)

In an insulating transformer, the primary coil (1) and the secondary coil (2), each having two terminals, are wound separately on a bobbin (3) in an insulated state and are arranged in a double arrangement on the inside of the core (4). A bracket (100) supporting the above bobbin (3) and the above core (4); A first PCB (110) fixed to one side of the upper surface of the above bracket (100) and having an input terminal (111) provided on the upper surface; A second PCB (120) fixed to the other side of the upper surface of the above bracket (100) and having an output terminal (121) provided on the upper surface; First and second socket connectors (130)(140) respectively connected to the above first PCB (110) circuit; A first plug connector (150) that is selectively inserted into one of the first and second socket connectors (130)(140) to connect the circuit in parallel or series; Third and fourth socket connectors (160) (170) respectively connected to the above second PCB (120) circuit; and A second plug connector (180) that is selectively inserted into one of the third and fourth socket connectors (160)(170) to connect the circuit in parallel or series; Insulating transformer, including: In the first paragraph, A fifth socket connector (112) connected to the above first PCB (110) circuit; A third plug connector (113) that is inserted into the fifth socket connector (112) and electrically connects the first coil (1) and the first PCB (110) circuit; A sixth socket connector (122) connected to the above second PCB (120) circuit; A fourth plug connector (123) that is inserted into the sixth socket connector (122) and electrically connects the second coil (2) and the second PCB (120) circuit; Insulating transformer, including: In claim 1 or 2, The above first socket connector (130) is The first coil (1) is electrically connected to the second terminal (12) of the first winding part (10), and is electrically connected to the third terminal (23) of the second winding part (20) of the first coil (1), but the second terminal (12) of the first winding part (10) and the third terminal (23) of the second winding part (20) are wired in a state where they are not connected to each other. The above second socket connector (140) is The first and second terminals (11) (12) of the first winding part (10) of the first coil (1) are electrically connected to each other, and the third and fourth terminals (23) (24) of the second winding part (20) of the first coil (1) are electrically connected to each other, but the first and second terminals (11) (12) of the first winding part (10) and the third and fourth terminals (23) (24) of the second winding part (20) are wired in a state where they are not connected to each other. The above third socket connector (160) is The wire is electrically connected to the sixth terminal (36) of the third winding part (30) of the secondary coil (2) and electrically connected to the seventh terminal (47) of the fourth winding part (40) of the secondary coil (2), but the sixth terminal (36) of the third winding part (30) and the seventh terminal (47) of the fourth winding part (40) are not connected to each other. The above fourth socket connector (170) is The fifth and sixth terminals (35)(36) of the third winding part (30) of the secondary coil (2) are electrically connected to each other, and the seventh and eighth terminals (47)(48) of the fourth winding part (40) of the secondary coil (2) are electrically connected to each other, but the fifth and sixth terminals (35)(36) of the third winding part (30) and the seventh and eighth terminals (47)(48) of the fourth winding part (40) are wired in a state where they are not connected to each other. The above first plug connector (150) is When connecting the circuit by inserting it into the first socket connector (130), the second terminal (12) of the first winding part (10) of the first coil (1) and the third terminal (23) of the second winding part (20) of the first coil (1) are cross-connected to each other. When connecting the circuit by inserting it into the second socket connector (140), the second terminal (12) of the first winding part (10) of the first coil (1) and the fourth terminal (24) of the second winding part (20) of the first coil (1) are mutually connected, and the first terminal (11) of the first winding part (10) of the first coil (1) and the third terminal (23) of the second winding part (20) of the first coil (1) are mutually connected, and The above second plug connector (180) is When connecting the circuit by inserting it into the third socket connector (160), the sixth terminal (36) of the third winding part (30) of the second coil (2) and the seventh terminal (47) of the fourth winding part (40) of the second coil (2) are cross-connected to each other. An insulating transformer that is cross-connected so that when connecting a circuit by inserting it into the fourth socket connector (170), the sixth terminal (36) of the third winding part (30) of the second coil (2) and the eighth terminal (48) of the fourth winding part (40) of the second coil (2) are mutually connected, and the fifth terminal (35) of the third winding part (30) of the second coil (2) and the seventh terminal (37) of the fourth winding part (40) of the second coil (2) are mutually connected.

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