JP3158030U - Transformer and transformer circuit - Google Patents

Abstract

Disclosed is a transformer and a transformer circuit capable of accurately detecting the output state of a discharge lamp, having a simple circuit arrangement, and reducing manufacturing costs. A transformer 200 includes a bobbin unit 1 having a first winding portion 11 and a second winding portion 12, a primary winding 31 wound around the first winding portion 11, and a second winding Between the two secondary windings 32 and the two secondary windings 32 that are wound around the winding portion 12 and electrically connected to the primary winding 31 at a predetermined interval. Both ends 331 and 332 wound around the second winding portion 12 and extended to reach the first winding portion 11 are wound around the second winding portion 12 between both ends 331 and 332. An induction winding 33 having a wound winding part 333, and a core unit 4 provided in the bobbin unit 1 so that the primary winding 31, the secondary winding 32, and the induction winding 33 form a magnetic circuit. Including. The bobbin unit 1 has a secondary ground terminal 127 electrically connected to the core unit 4. [Selection] Figure 1

Description

  The present invention relates to a transformer and a transformer circuit, and more particularly to a transformer and a transformer circuit that can detect an output state of the transformer.

  Conventionally, a discharge lamp circuit has been used as a backlight of a liquid crystal display device, and the operation state of the discharge lamp is monitored in the circuit, and the circuit is protected by turning off the power or lowering the voltage in accordance with the monitoring signal. The protection circuit is arranged as follows.

  In order to monitor the state of the discharge lamp, the discharge lamp protection circuit is usually connected directly to the discharge lamp circuit, but these circuits must be insulated from each other. For this reason, the circuit must be arranged with sufficient creepage distance and clearance. Accordingly, the circuit arrangement becomes complicated (see, for example, Patent Documents 1 to 3).

  Therefore, in order to ensure both the creepage distance and the spatial distance sufficiently, and to simplify the arrangement of the circuit, as a light detection means for detecting light emission by the discharge lamp, an optoelectronic element such as a photodiode is used as the discharge lamp circuit and There is a technique of connecting between protection circuits (see, for example, Patent Document 4).

Taiwan Notice I287214 Taiwan Notice M309184 Taiwan Notice I250340 Taiwan Notice M244703

  If an optoelectronic element is used as the photodetection means as in the technique described in Patent Document 4, the protection circuit can detect the state of the discharge lamp without being directly connected to the discharge lamp circuit via the optoelectronic element.

However, as the screen of the liquid crystal display device becomes larger, the number of discharge lamps also increases, and as the number of discharge lamps increases, the number of optoelectronic elements increases, leading to an increase in cost. In addition, even if a small number of light emissions from a plurality of discharge lamps are detected, it cannot be guaranteed that the operating state of the discharge lamp can be detected correctly, so there is still room for improvement.
The present invention has been made in view of the above problems, and provides a transformer and a transformer circuit capable of accurately detecting the output state of a discharge lamp, having a simple circuit arrangement, and reducing manufacturing costs. For the purpose.

In order to achieve the above object, the present invention provides a bobbin unit having a first winding portion and a second winding portion, a primary winding wound around the first winding portion, Between the two secondary windings wound around the second winding portion and electrically connected to the primary winding at a predetermined interval Winding wound around the second winding portion of the second winding portion and the both ends extended to reach the first winding portion and the second winding portion between the both end portions. Including a core unit provided in the bobbin unit such that the induction winding has a magnetic circuit, and the primary winding, the secondary winding, and the induction winding form a magnetic circuit. A featured transformer is provided.
In order to achieve the other object, the present invention is connected to the transformer, a general-purpose feedback unit that is electrically connected to the induction winding and detects the output state of the transformer, and a power source. As described above, the power source and the primary winding are electrically connected to and disconnected from the primary winding and the general-purpose feedback unit according to the output state of the transformer detected by the general-purpose feedback unit. The general-purpose feedback unit and the switch unit, the creepage distance and the spatial distance between the first and second winding portions satisfy the safety standard. A transformer circuit is provided, wherein the transformer circuit is provided on the first winding portion side apart from a second winding portion.

  The transformer of the present invention is assembled so that the first and second winding portions are spaced apart from each other by a predetermined interval, and both ends of the induction winding electromagnetically connected to the secondary winding are first. Since it extends to one winding portion, it is possible to ensure a spatial distance and a creepage distance satisfying the safety standard between the first and second winding portions. Further, in the transformer circuit, the general-purpose feedback unit and the switch unit are always provided on the first winding part side away from the second winding part having a higher voltage than the first winding part of the transformer. The circuit layout in the circuit design can be simplified.

It is a perspective view showing an example of a transformer concerning the present invention. FIG. 2 is an assembled perspective view of the transformer of FIG. 1. FIG. 3 is a partial cross-sectional view taken along line III-III of the transformer of FIG. 2. It is an assembly bottom view of the transformer of FIG. 1 is a perspective view showing a first embodiment of a transformer circuit according to the present invention. It is a perspective view which shows 2nd Embodiment of the transformer circuit which concerns on this invention. It is a circuit diagram which shows an example of the voltage feedback subunit of the general purpose feedback unit in a transformer circuit. It is a circuit diagram which shows an example of a current detection circuit.

Embodiments of the present invention will be described below with reference to the drawings. In addition, about the component which has a similar structure and function, the same number is attached | subjected and the description is abbreviate | omitted.
1 is a perspective view showing an example of a transformer according to the present embodiment, FIG. 2 is an assembled perspective view of the transformer of FIG. 1, FIG. 3 is a partial sectional view taken along line III-III in FIG. 2, and FIG. FIG. 2 is an assembly bottom view of the transformer of FIG. 1. As illustrated, the transformer 200 includes a bobbin unit 1, a primary winding 31, two secondary windings 32, an induction winding 33, and a core unit 4.

The bobbin unit 1 is positioned such that the first winding portion 11, the second winding portion 12, and the first winding portion 11 and the second winding portion 12 are positioned at a predetermined interval. And an assembly portion 13 for holding them.
The primary winding 31 is wound around both sides of the first winding portion 11 of the bobbin unit 1 with a predetermined interval.
The secondary winding 32 is electromagnetically coupled to the primary winding 31 and is wound around both sides of the second winding portion 12 of the bobbin unit 1 with a predetermined interval.

  The induction winding 33 is wound around the second winding portion 12 between the second windings 32, and includes one end 331, the other end 332, one end 331, and the other end 332 (both ends). ) And a winding part 333 wound around the second winding part 12. In this example, one end portion 331 and the other end portion 332 of the induction winding 33 are extended to the first winding portion 11 of the bobbin unit 1. The induction winding 33 is provided with an insulating layer whose clearance distance and creepage distance satisfy safety standards. As this safety standard, for example, there are IEC60065 defined by the National Electrotechnical Commission (IEC), IEC60950, IEC60664-1, for example, VDE standard by the Japan Electronics and Information Technology Association, UL standard, TUV standard, and the like. As an example, the insulating layer of the induction winding 33 is configured to have a dielectric strength of 3750 volts or more. In this example, the induction winding 33 is constituted by a copper wire wound with a plurality of insulating layers, for example, a conductive wire. As the insulating layer, polytetrafluoroethylene (Teflon (registered trademark)) or other insulating material is used so that the spatial distance and creepage distance between the first and second winding portions 11 and 12 satisfy the safety standard. Composed.

In this example, the first winding part 11, the second winding part 12 and the assembly part 13 are configured as a single member in the bobbin unit 1, and the assembly part 13 extends longitudinally along the X-axis direction. Being done. The first and second winding portions 11 and 12 are fixedly attached to the assembly portion 13 along the A and B directions facing each other in the Y axis perpendicular to the X axis.
The first winding portion 11 includes a hollow first body 111 extending along the X-axis direction, and two first protrusions protruding from the first body 111 in the opposite C and D directions on the X-axis. Core mounting portions 112 a and 112 b, and a plurality of first conductive terminals 113 are provided on the first body portion 111. The first core mounting portions 112a and 112b respectively have upper walls 114a and 114b and lower walls 115a and 115b facing each other in the direction of the Z axis perpendicular to the X and Y axes, and the upper walls 114a and 114b and the lower walls 115a, 115 b and outer walls 116 a and b (only the outer wall 116 b is shown in FIG. 1) connected to 115 b and extending along the Z-axis direction, and configured to open in the A direction, the C direction, and the D direction side. .

  The second winding portion 12 includes a hollow second body portion 121 extending along the X-axis direction, and two second protrusions protruding from the second body portion 121 in the opposite C and D directions on the X-axis line. The second body 121 is provided with a plurality of second conductive terminals 123a, 123b, 123c, 123d, and the like. The second core mounting portions 122a and 122b respectively have upper walls 124a and 124b and lower walls 125a and 125b facing each other in the direction of the Z axis perpendicular to the X and Y axes, and the upper walls 124a and 124b and the lower wall 125a, 125b (only the lower wall 125b is shown in FIG. 1) and outer walls 126a, 126b extending along the Z-axis direction, and configured to open in the B direction, the C direction, and the D direction side. The

The assembly portion 13 is provided with first and second engaging portions 131 and 132 facing each other across the X-axis so that the first and second winding portions 11 and 12 are engaged with each other. Yes.
The first engaging portion 131 of the assembly portion 13 has upper slits 133a and 133b into which the upper walls 114a and 114b of the first core mounting portions 112a and 112b are fitted (only the upper slit 133b is shown in FIG. 1). And lower slits 134a and 134b (only the lower slit 134b is shown in FIG. 1) into which the lower walls 115a and 115b are fitted.

The second engaging portion 132 of the assembly portion 13 is an upper slit 135a, 135b (only the upper slit 135a is shown in FIG. 1) into which the upper walls 124a, 124b of the second core mounting portions 122a, 122b are fitted. And lower slits 136a and 136b into which the lower walls 125a and 125b are fitted.
In this example, the assembly portion 13 is further opposed to each other in the Z-axis direction and extends along the X-axis direction to form the upper slits 133 and 135, and the C and D directions in the X-axis direction. And two bottom walls 138a and 138b for forming lower slits 134 and 136, respectively.

The first and second winding portions 11 and 12 and the assembly portion 13 form upper walls 114 and 124, lower walls 115 and 125, upper slits 133 and 135, and lower slits 134 and 136, respectively. Therefore, not only the engagement effect between the first and second winding portions 11 and 12 and the assembly portion 13 is increased, but also the creeping distance between the first and second winding portions 11 and 12 is increased. You can also.
In the assembly portion 13, a slot 139 is formed between the two bottom walls 138 a and 138 b from the first engagement portion 131 side toward the second engagement portion 132 side. Extension portions of both end portions 331 and 332 of the induction winding 33 are accommodated in the slot 139 so as to reach the first winding portion 11.
Further, both end portions 331 and 332 of the induction winding 33 are connected to the first conductive terminals 113a and 113b, respectively. Thus, the induction winding 33 is accommodated in the boundary of the assembly part 13 defined by the cover wall 137 and the bottom walls 138a and 138b. As a result, the overall dimensions of the transformer 200 can be reduced in the Z-axis direction.

The core unit 4 is attached to the bobbin unit 1 so that the primary winding 31, the secondary winding 32, and the induction winding 33 together form a magnetic path of the magnetic circuit. The core unit 4 has, for example, two leg portions extending at right angles from both ends in the Y-axis direction so as to be attached to the core attachment portions 112 and 122 of the first and second winding portions 11 and 12. Two U-shaped cores 41a and 41b are provided.
The second winding portion 12 further has a secondary ground terminal 127 connected to the core unit 4 for grounding. The secondary ground terminal 127 eliminates the reflected voltage of the core unit 4 from the secondary side of the transformer 200, thereby reducing the voltage difference between the primary side and the secondary side of the transformer 200 compared to the conventional one. To help. Since the voltage difference between the primary side and the secondary side of the transformer 200 is reduced, the required safety distance can be shortened, so that the overall dimensions of the transformer can be reduced. Note that the connection between the secondary ground terminal 127 and the core unit 4 is performed by a conductive adhesive.

  As shown in FIGS. 1, 2 and 4, when assembling the transformer 200 of the present invention, first, the primary winding 31 is wound around the first winding portion 11 of the bobbin unit 1, and the secondary winding 32 and the induction Winding 33 is wound around second winding portion 12. Then, the first and second winding portions 11 and 12 are engaged with the assembly portion 13, and both end portions 331 and 332 of the induction winding 33 pass through the slot 139 of the assembly portion 13 so that the first winding portion 11 and is connected to the first conductive terminal 113 by soldering. Finally, the core unit 4 is incorporated into the bobbin unit 1 to manufacture the transformer 200.

(First embodiment)
<Transformer circuit>
The transformer 200 of this embodiment is applied to the transformer circuit shown in FIG. In the transformer circuit of the present embodiment, two fluorescent lamps 100 a and 100 b are attached to the secondary side of the transformer 200, and the general-purpose feedback unit 5, the switch unit 7, and the power source are provided on the primary side of the transformer 200. 8 is provided with a power control unit 6 connected to 8.
The secondary winding 32 of the transformer 200 is connected to the two discharge lamps 100a and 100b, and drives the discharge lamps 100a and 100b. The secondary ground terminal 127 of the second winding portion 12 is connected to the core unit 4 so that the core unit 4 is at ground potential. The first winding portion 11 has a primary ground terminal 117 electrically connected to the core unit 4 at a location corresponding to the secondary ground terminal 127 (see FIG. 2). 117 keeps the core unit 4 at the ground potential.

For example, as shown in FIG. 5, the general-purpose feedback unit 5 includes a voltage feedback subunit 51, and the voltage feedback subunit 51 is electrically connected to both ends 331 and 332 of the induction winding 33 of the transformer 200. The output state of the transformer 200 is detected. As an example, it is assumed that the output voltage of the transformer 200 is regarded as the output state of the transformer 200.
The switch unit 7 is electrically connected to the primary winding 31 of the voltage feedback subunit 51 and the transformer 200, and the primary winding 31 and the power source according to the output state of the transformer 200 detected by the voltage feedback subunit 51. The connection / disconnection between 8 is switched.

The voltage feedback subunit 51 is also electrically connected to the switch unit 7 in addition to the induction winding 33. When the voltage feedback subunit 51 detects an overvoltage in the transformer 200 via the induction winding 33, the voltage feedback subunit 51 Control is performed to switch connection / disconnection between the primary winding 31 and the power source 8.
The power control unit 6 is electrically connected between the power source 8 and the switch unit 7. When the switch unit 7 conducts between the primary winding 31 and the power source 8, the power supplied to the primary winding 31. Configured to control the amount.

  In this example, the general-purpose feedback unit 5, the power control unit 6, and the switch unit 7 are both combined with the transformer 200 so as to satisfy the safety standards regarding the spatial distance and creepage distance in the first and second winding portions 11 and 12. Although the form provided in one side of the 1st coil part 11 separated from the 2nd coil part 12 of bobbin unit 1 was explained, it is not restricted to this.

(Second Embodiment)
FIG. 6 is a perspective view showing a second embodiment of the transformer circuit according to the present invention. In addition to the first embodiment, the current sensing circuit 9 is further included, and the general-purpose feedback unit 5 ′ further includes a current feedback subunit 52 in addition to the voltage feedback subunit 51 as a voltage feedback unit.
When the voltage feedback subunit 51 feeds back the output voltage of the transformer 200 to the switch unit 7, the current feedback subunit 52 is configured to feed back the output current of the transformer 200 such as an overcurrent of the lamp to the switch unit 7. ing.

The current feedback subunit 52 is electrically connected between the current sensing circuit 9 and the power control unit 6. The current sensing circuit 9 is electrically connected to the secondary winding 32 of the transformer 200 so as to detect the output current of the transformer 200. Since the power control unit 6 is electrically connected to the current feedback subunit 52, when the primary winding 31 and the power source 8 are connected by the switch unit 7, the secondary current of the transformer 200 is detected by the current sensing circuit 9. Output current detected by the current feedback subunit 52 is input to the power control unit 6, and the power control unit 6 is supplied to the primary winding 31 in accordance with the detected output current. To control the power.
As described above, the voltage feedback subunit 51 and the power control unit 6 control the switch unit 7 so as to connect / disconnect between the primary winding 31 and the power supply 8 according to the output state of the transformer 200. In other words, in the first embodiment, the switch unit 7 is controlled according to the output voltage of the transformer 200, and in the second embodiment, the switch unit 7 is controlled according to the output current of the transformer 200.

As described above, according to each embodiment, two transformer circuit protection means as shown in FIGS. 5 and 6 are realized. That is, in FIG. 5, the transformer circuit protection means is implemented by the switch unit 7 that is operated in accordance with the output voltage of the transformer detected by the voltage feedback subunit 51, for example. On the other hand, in FIG. 6, the transformer circuit protection means is implemented by controlling the switch unit 7 according to, for example, the output voltage of the transformer 200 and the total output current on the secondary side of the transformer 200.
5 may be configured to include one transformer 200, or may be configured to include a plurality of transformers 200a and 200b as illustrated in FIG.

In the second embodiment, the induction windings 33a and 33b of the transformers 200a and 200b are connected to each other and connected in parallel to the voltage feedback subunit 51, and the four discharge lamps 100c, 100d, 100e, and 100f are transformer circuits. It is comprised so that it may be driven by. It should be noted that the connection of the discharge lamp 100 disclosed in the accompanying drawings is merely an example for carrying out the present invention, and is not limited thereto.
FIG. 7 is a circuit diagram showing an example of the voltage feedback subunit 51 in the present embodiment. The voltage feedback subunit 51 includes a transistor T, a plurality of diodes D and ZD, a plurality of resistors R, and a plurality of capacitors C.

FIG. 8 is a circuit diagram showing an example of a current sensing circuit 9 which is an example of a current detection circuit. The current sensing circuit 9 includes one or more resistors 91 and an optocoupler 92 according to the number of transformers 200 in the transformer circuit. Here, since the transformer circuit shown in FIG. 6 has two transformers 200a and 200b, the two resistors 91a and 91b of the current sensing circuit 9 are respectively connected to the secondary windings 32 of the corresponding transformers 200a and 200b. Electrically connected and configured so that output currents I ₁ and I ₂ from corresponding transformers 200200a and 200b flow. An optocoupler 92 is electrically connected between the two resistors 91 a and 91 b and the current feedback subunit 52, and is electrically isolated when the total output current on the secondary side of the transformer 200 flows to the current feedback subunit 52. It has an action that can be adjusted.

  As described above, according to the transformer 200 of the present embodiment, the output state of the transformer can be determined by detecting the variation of the induction signal in the induction winding 33 electromagnetically coupled to the secondary winding 32. In addition, since both end portions 331 and 332 of the induction winding 33 are extended to the first winding portion 11, a spatial distance satisfying the safety standard between the first and second winding portions 11 and 12, and Creepage distance is secured. In the transformer 200, the second winding unit in which the general-purpose feedback unit 5, the power control unit 6, and the switch unit 7 (or these and other predetermined constituent elements) always have a higher voltage than the first winding unit 11. Since it is provided on the first winding portion 11 side away from 12, the circuit layout in the circuit design can be simplified.

DESCRIPTION OF SYMBOLS 1 Bobbin unit 100 Fluorescent lamp 11 1st coil | winding part 111 1st trunk | drum 112 1st core attachment part 113 1st conductive terminal 114 Upper wall 115 Lower wall 116 Outer wall 12 2nd coil | winding part 121 2nd 122 Second core mounting portion 123 Second conductive terminal 124 Upper wall 125 Lower wall 126 Outer wall 127 Secondary ground terminal 13 Gathering portion 131 First engagement portion 132 Second engagement portion 133, 135 Slit 134, 136 Lower slit 137 Cover wall 138 Bottom wall 139 Slot 200 Transformer 31 Primary winding 32 Secondary winding 33 Induction winding 331, 332 End portion 333 Winding portion 4 Core unit 41 Core 5, 5 'General purpose feedback unit 51 Voltage feedback subunit 52 Current feedback subunit 6 Power control unit 7 Switch unit 8 Power supply 9 Current Intellectual circuit 91 resistance 92 optocoupler -
C Capacitance D, ZD Diode R Resistance T Transistor

Claims (24)

A bobbin unit having a first winding portion and a second winding portion;
A primary winding wound around the first winding portion;
Two secondary windings wound around the second winding portion and electrically connected to the primary winding at a predetermined interval;
Both ends wound around the second winding portion between the two secondary windings and extended to reach the first winding portion, and the second portion between the both ends. An induction winding having a winding portion wound around the winding portion;
A core unit provided in the bobbin unit such that the primary winding, the secondary winding, and the induction winding form a magnetic circuit;
Transformer characterized by including.   2. The transformer according to claim 1, wherein the bobbin unit further includes an assembly part that holds the first winding part and the second winding part at a predetermined interval.   The said 1st coil | winding part has a some conductive terminal, and two in these some conductive terminals are each connected to the both ends of the said induction winding corresponding to each. Transformer.   The induction winding is provided with an insulating layer so that a creepage distance and a spatial distance between the first winding portion and the second winding portion satisfy safety standards. The transformer according to claim 1. The first winding portion, the second winding portion, and the assembly portion are each configured as a single member in the bobbin unit,
The assembly is elongated longitudinally along a first axial direction;
The first winding portion and the second winding portion are respectively attached to the assembly portion along first and second directions facing each other in a second axis perpendicular to the first axis. The transformer according to claim 2. The assembly portion is configured such that the first engagement portion and the second engagement portion have the first axis so that the first winding portion and the second winding portion are engaged with each other. Provided opposite to each other,
The first winding portion includes a hollow first body portion extending along the first axial direction, and third and fourth opposite to each other in the first axis from the first body portion. Two first core mounting portions projecting in the direction of, and a plurality of first conductive terminals are provided on the first body portion,
The second winding portion includes a hollow second body portion extending along the first axial direction, and third and fourth opposite to each other in the first axis from the second body portion. Two second core mounting portions projecting toward the direction of, and a plurality of second conductive terminals are provided on the second body portion,
The transformer according to claim 5, wherein the core unit is attached to the first and second core attaching portions. The first core mounting portions are perpendicular to the first and second axes so as to open to the first direction side and the third direction side, respectively, and to the first direction side and the fourth direction side. An upper wall and a lower wall facing each other in the direction of the three axial lines, and an outer wall connected to the upper and lower walls and extending along the third axial direction,
The second core mounting portions are upper walls facing each other in the direction of the third axis so as to open to the second direction side and the third direction side, and to the second direction side and the fourth direction side, respectively. The transformer according to claim 6, further comprising an outer wall connected to the upper wall and the lower wall and extending along the third axial direction. The first engaging portion of the assembly portion has two upper slits into which the upper wall of the first core mounting portion is fitted and two lower slits into which the lower wall is fitted,
The said 2nd engaging part has two upper slits by which the upper wall of the said 2nd core attaching part is fitted, and two lower slits by which the said lower wall is fitted. 8. The transformer according to 7. The assembly is further opposed to each other in the third axial direction and extends along the first axial direction to form the upper slit and the first wall in the first axial direction. Having two bottom walls extending in three directions and the fourth direction to form the lower slit;
The cover wall and the two bottom walls face each other in the third axial direction,
A slot is formed between the two bottom walls from the first engagement portion side toward the second engagement portion side,
The extension part of the both ends of the said induction | winding winding is comprised so that it may be accommodated in the said slot so that it may reach to the said 1st winding part from the said 2nd winding part. The described transformer.   The transformer according to claim 9, wherein both end portions of the induction winding are respectively connected to two first conductive terminals of the first winding portion.   The slot in which the extending part of the both ends of the induction winding from the second winding part to the first winding part is accommodated is formed in the assembly part. 5. The transformer according to 5.   The induction winding is provided with an insulating layer so that a creepage distance and a spatial distance between the first winding portion and the second winding portion satisfy safety standards. The transformer according to claim 11.   12. The first winding portion has a plurality of conductive terminals, and two of the plurality of conductive terminals are respectively connected to both ends of the corresponding induction winding. Transformer.   The transformer according to claim 5, wherein the second winding part has a secondary ground terminal electrically connected to the core unit. A bobbin unit having a first winding portion and a second winding portion;
A primary winding wound around the first winding portion;
Two secondary windings wound around the second winding portion and electrically connected to the primary winding at a predetermined interval;
Both ends wound around the second winding portion between the two secondary windings and extended to reach the first winding portion, and the second portion between the both ends. An induction winding having a winding portion wound around the winding portion;
A transformer having a core unit provided in the bobbin unit such that the primary winding, the secondary winding, and the induction winding form a magnetic circuit;
A general-purpose feedback unit that is electrically connected to the induction winding and detects the output state of the transformer;
It is electrically connected to the primary winding and the general-purpose feedback unit so as to be connected to a power source, and between the power source and the primary winding according to the output state of the transformer detected by the general-purpose feedback unit. Including a switch unit that switches to connect / disconnect,
The general-purpose feedback unit and the switch unit are separated from the second winding portion of the bobbin unit so that a creepage distance and a spatial distance between the first and second winding portions satisfy safety standards. The transformer circuit is provided on the first winding portion side.   The general-purpose feedback unit is electrically connected to the induction winding and the switch unit as a voltage feedback unit, detects an output voltage of the transformer, and the primary winding and the power source according to the detected output voltage The transformer circuit according to claim 15, wherein the switch unit is controlled so as to be switched so as to connect / disconnect between. A power control unit configured to be electrically connected to a power source and the switch unit;
The universal feedback unit is
A voltage feedback subunit electrically connected to the induction winding to detect the output voltage of the transformer;
Electrically connected to the secondary winding to detect the output current of the transformer, and when the output current of the transformer is detected, the output current is output to the power control unit. A current feedback subunit electrically connected to the power control unit;
The power control unit and the voltage feedback subunit connect / disconnect between the primary winding and the power source according to the output voltage and output current detected by the voltage feedback subunit and the current feedback subunit. Controlling the switch unit to switch,
The power control unit is configured to control power to the primary winding when connecting the primary winding and the power source by the switch unit. Transformer circuit.   The power control unit is separated from the second winding portion of the bobbin unit such that a creepage distance and a spatial distance between the first and second winding portions satisfy safety standards. The transformer circuit according to claim 17, wherein the transformer circuit is provided on a winding portion side.   An insulating layer is provided on the induction winding so that a creepage distance and a spatial distance between the first winding portion and the second winding portion satisfy a safety standard. 15. The transformer circuit according to 15. And a plurality of the transformers,
The transformer circuit according to claim 15, wherein each of the induction windings in the plurality of transformers is connected in parallel to the general-purpose feedback unit.   The transformer circuit according to claim 15, wherein the core unit is grounded.   The transformer circuit according to claim 15, wherein the second winding part further includes a secondary ground terminal connected to the core unit for grounding.   The transformer circuit according to claim 22, wherein the secondary ground terminal and the core unit are connected by a conductive adhesive.   16. The transformer circuit according to claim 15, wherein the bobbin unit further includes an assembly unit that holds the first winding unit and the second winding unit at a predetermined interval.

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