JP2017169431A - Power supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply device that can suppress common mode noise without increasing cost or circuit amount.SOLUTION: One terminal of capacitors 11-14 is connected to four power supply wirings 21-24 which connect terminals A1-A4 and converter 10 in a power supply device 1. The capacitors 11-14 is placed on the same side as the converter 10 at a plane position closely on a circuit board 17, and the other terminals of the capacitors 11-14 are electrically connected using a connection wiring, an enclosure, or an aerial wiring. Parasitic inductance occurring between connection points is reduced, and common mode noise is suppressed by closing connection points of the capacitors 11, 12 and connection points of the capacitors 13, 14.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power supply device, and more particularly, to a power supply device that converts an AC voltage into a DC voltage, and a power supply device that converts a DC voltage into a DC voltage of a different level.

  In order to supply DC voltage to electronic devices, a power supply device that converts AC voltage supplied from commercial power supply to DC voltage, or a power supply device that converts DC voltage supplied from a battery to a different level of DC voltage is used. Is done. As such a power supply device, a switching power supply device that switches the state of a switching element at high speed and converts an input voltage (AC voltage or DC voltage) to a DC voltage of a desired level is widely used.

  In the switching power supply device, since the switching element operates at a high speed, high frequency noise is generated. Noise generated in the switching power supply device is classified into normal mode noise that propagates in two power supply lines in the opposite direction and common mode noise that propagates in two power supply lines in the same direction. In order to suppress these noises, filter parts such as coils and capacitors are provided on the input side and output side of the switching power supply device.

  In the following, the common mode noise generated in the switching power supply will be examined. Common mode noise is generated when noise current flows through the ground. The noise current between the switching power supply and the ground flows through a capacitor formed between the casing of the switching power supply and a load line for supplying power and the ground. For this reason, in order to suppress common mode noise, it is necessary to prevent the noise current from being output to the outside of the switching power supply device. In order to suppress common mode noise, the switching power supply device is provided with a Y capacitor (also called a Y capacitor or a line bypass capacitor), a common mode choke coil, or the like.

  In relation to the present invention, Patent Document 1 describes a power supply device shown in FIG. 32, capacitors C1, C2, C11, C12 and a choke coil L1 are provided on the input side of the DC / DC converter 121, and capacitors C3, C4, C13, C14 are provided on the output side of the DC / DC converter 121. And a choke coil L2. The connection point between the capacitors C1 and C2 and the connection point between the capacitors C3 and C4 are connected to the sheet metal case 122 (frame ground). The connection points of the capacitors C11 and C12 and the connection points of the capacitors C13 and C14 are connected to the metal plate 123.

JP 2006-271135 A

  As described above, the switching power supply device is provided with a filter component in order to suppress noise. However, if the filter component is provided, the cost of the switching power supply device increases accordingly. Further, since the filter component occupies a certain area on the circuit board, the area of the circuit board increases as the number of filter components increases. As described above, the switching power supply device has a problem that if noise countermeasures are taken, the cost increases, and it becomes impossible to reduce the size and thickness.

  In general, an unexpected parasitic inductance is generated in a metal conductor (for example, a metal housing or wiring formed on a circuit board). In the power supply device shown in FIG. 32, since the connection points of the capacitors C1 and C2 and the connection points of the capacitors C3 and C4 are separated, a large parasitic inductance 124 is generated in the sheet metal case 122 (see FIG. 33). In addition, since the connection point between the capacitors C11 and C12 and the connection point between the capacitors C13 and C14 are separated from each other, a large parasitic inductance 125 is also generated in the metal plate 123. When a noise current flows through the parasitic inductances 124 and 125, the potential of the output side frame ground (the connection point of the capacitors C3 and C4) varies with respect to the potential of the input side frame ground (the connection point of the capacitors C1 and C2). Common mode noise is generated. If an additional measure against common mode noise is performed in the power supply device shown in FIG. 32, the cost and the circuit amount increase.

  Therefore, an object of the present invention is to provide a power supply device that can suppress common mode noise without increasing cost and circuit amount.

A first invention is a power supply device that converts a voltage input from the first and second terminals and outputs the converted voltage from the third and fourth terminals,
A converter arranged on the circuit board and converting the voltage;
One terminal includes first to fourth capacitors respectively connected to first to fourth power supply wirings connecting the first to fourth terminals and the converter,
The first to fourth capacitors are arranged close to the circuit board,
The other terminals of the first to fourth capacitors are electrically connected.

According to a second invention, in the first invention,
The circuit board is a double-sided board capable of forming wiring on both sides,
The other terminal of the first to fourth capacitors is connected to a connection wiring formed on the circuit board.

According to a third invention, in the second invention,
The connection wiring is formed only on one surface of the circuit board.

According to a fourth invention, in the third invention,
The circuit board is housed in a metal housing, has a through hole formed at the position of the connection wiring, and a screw inserted into the through hole is formed with a female screw at one end. The other end is screwed to a metal support fixed to the housing.

According to a fifth invention, in the third invention,
A heat sink,
The circuit board has a through hole formed at an arrangement position of the connection wiring, a female screw is formed at one end using a screw inserted into the through hole, and the other end is fixed to the heat sink. It is characterized by being screwed to a metal post.

A sixth invention is the second or third invention, wherein
The other terminals of the first to fourth capacitors are commonly connected to one connection wiring formed on the circuit board.

According to a seventh invention, in the second invention,
The connection wiring is formed so as to have an overlapping portion between the first connection wiring formed on one surface of the circuit board and the first connection wiring on the other surface of the circuit board. Connection wiring.

In an eighth aspect based on the seventh aspect,
The first and second connection wirings are electrically connected using a through hole formed in the overlapping portion.

According to a ninth invention, in the seventh invention,
The circuit board is housed in a metal housing and has a through hole formed in the overlapping portion. A screw inserted into the through hole is used to form a female screw at one end and the other end at the other end. It is screwed to a metal support fixed to the casing.

In a tenth aspect based on the seventh aspect,
A heat sink,
The circuit board has a through hole formed in the overlapping portion, and a screw inserted into the through hole is formed with a female screw at one end and the other end fixed to the heat sink. It is characterized by being screwed to the column.

In an eleventh aspect based on the first aspect,
The circuit board is a single-sided board capable of forming wiring on one side,
The other terminals of the first and second capacitors are connected to a first connection wiring formed on the circuit board,
The other terminal of the third and fourth capacitors is connected to a second connection wiring formed on the circuit board.

In a twelfth aspect based on the eleventh aspect,
The circuit board is housed in a metal housing, has a through hole at each of the first and second connection wiring positions, and has a female screw at one end using a screw inserted into the through hole. The other end is screwed to a metal column fixed to the housing.

In a thirteenth aspect based on the eleventh aspect,
A heat sink,
The circuit board has through holes at the arrangement positions of the first and second connection wirings, and a female screw is formed at one end using a screw inserted into the through hole, and the other end is formed on the heat sink. It is characterized by being screwed to a fixed metal post.

In a fourteenth aspect based on the eleventh aspect,
The first and second connection wirings are electrically connected using a double insulated aerial wiring.

In a fifteenth aspect based on the first aspect,
In the circuit board, one or more connection wirings are formed to connect the other terminals of the first to fourth capacitors,
The first to fourth power supply wires and the connection wires are arranged on the circuit board with a distance satisfying safety standards.

In a fifteenth aspect based on the fifteenth aspect,
Each of the first and second capacitors is composed of a single capacitor.

In a fifteenth aspect based on the fifteenth aspect,
Each of the first and second capacitors is composed of two capacitors connected in series.

In an eighteenth aspect based on the fifteenth aspect,
The first capacitor includes two capacitors connected in series, including a common capacitor,
The second capacitor includes two capacitors connected in series including the common capacitor.

In a nineteenth aspect based on the first aspect,
A first common mode choke coil provided on the first and second power supply wirings;
A second common mode choke coil provided on the third and fourth power supply wirings,
The first and second common mode choke coils are characterized in that at least one pair of terminals are arranged at the same position.

In a twentieth aspect based on the nineteenth aspect,
The first common mode choke coil is disposed on the circuit board;
The second common mode choke coil is covered with a reinforced insulating tape and is provided outside the circuit board in a state of being connected to a double insulated air wiring.

In a twenty-first aspect based on the first aspect,
A first common mode choke coil provided on the first and second power supply wirings;
A second common mode choke coil provided on the third and fourth power supply wirings,
A portion of the first and second power supply wirings corresponding to the arrangement position of the second common mode choke coil is a first portion, and a part of the third and fourth power supply wirings is an arrangement position of the first common mode choke coil. When the corresponding portion is the second portion, at least one of the first common mode choke coil and the first portion and the second common mode choke coil and the second portion is electrically shielded. It is characterized by that.

In a twenty-second aspect based on the first aspect,
A common mode choke coil provided on the first and second power supply lines and disposed on the circuit board;
The circuit board has a slit between the third and fourth power supply wires and the common mode choke coil.

A twenty-third invention is the first invention, wherein
The circuit board is housed in a metal casing,
The other terminals of the first to fourth capacitors are electrically connected to the casing.

A twenty-fourth invention is the first invention, in the first invention,
A heat sink,
The other terminals of the first to fourth capacitors are electrically connected to the heat sink.

In a twenty-fifth invention according to any one of the first to twenty-fourth inventions,
The first to fourth capacitors are arranged on the same side of the converter in a planar position on the circuit board.

In a twenty-sixth aspect based on the first aspect,
The converter converts an AC voltage into a DC voltage.

The twenty-seventh invention is the first invention, in which
The converter converts a DC voltage into a DC voltage of a different level.

  According to the first aspect of the invention, by electrically connecting the connection point of the first and second capacitors and the connection point of the third and fourth capacitors, the fluctuation of the potential at the two connection points is suppressed. be able to. In addition, by arranging the first to fourth capacitors close to each other, the other terminals of the first to fourth capacitors can be easily electrically connected at low cost, and a parasitic generated between the two connection points. Inductance can be reduced and common mode noise can be suppressed. Therefore, common mode noise can be suppressed without increasing cost and circuit amount.

  According to the second aspect of the invention, the power supply device is miniaturized using the double-sided board, and the other terminals of the first to fourth capacitors can be easily and low-cost using the connection wiring formed on the double-sided board. Can be electrically connected.

  According to the third aspect, the other terminals of the first to fourth capacitors can be easily connected by connecting the other terminals of the first to fourth capacitors to the connection wiring formed on one surface of the double-sided board. Can be electrically connected at low cost.

  According to the fourth or fifth invention, the other terminals of the first to fourth capacitors are screwed to the support post fixed to the housing (or heat sink) at the arrangement position of the connection wiring. It can be electrically connected to the housing. Thus, by electrically connecting the two connection points to a housing (or heat sink) having a large size and a stable potential, fluctuations in potential at the two connection points are effectively suppressed, and the common mode Noise can be effectively suppressed.

  According to the sixth invention, the other terminals of the first to fourth capacitors can be easily connected by connecting the other terminals of the first to fourth capacitors to one connection wiring formed on the circuit board. Electrical connection can be made at low cost.

  According to the seventh aspect, by connecting the other terminals of the first to fourth capacitors to the first and second connection wires formed so as to have overlapping portions on both surfaces of the double-sided substrate, The other terminal of the fourth capacitor can be easily electrically connected at low cost.

  According to the eighth aspect of the present invention, the other terminals of the first to fourth capacitors can be easily electrically connected by electrically connecting the first and second connection wires using the through holes. it can.

  According to the ninth or tenth aspect of the present invention, the circuit board is screwed to the support fixed to the housing (or the heat sink) at the overlapping portion of the first and second connection wirings, whereby the first to fourth capacitors The other terminal can be electrically connected to the housing (or heat sink). As a result, the same effects as those of the fourth invention can be obtained.

  According to the eleventh aspect of the present invention, the first and second connection wires are electrically connected by connecting the other terminals of the first to fourth capacitors to the first and second connection wires formed on the single-sided substrate. By connecting, the other terminals of the first to fourth capacitors can be electrically connected.

  According to the twelfth or thirteenth aspect of the present invention, the circuit board is screwed to the support fixed to the housing (or the heat sink) at the position where the first and second connection wirings are arranged, whereby the first to fourth capacitors The other terminal can be electrically connected to the housing (or heat sink). As a result, the same effects as those of the fourth invention can be obtained.

  According to the fourteenth aspect of the invention, the other terminals of the first to fourth capacitors can be electrically connected by electrically connecting the first and second connection wirings using the aerial wiring.

  According to the fifteenth aspect of the present invention, the power supply device conforming to the safety standard can be provided by arranging the power supply wiring and the connection wiring at a predetermined distance on the circuit board.

  According to the sixteenth to eighteenth aspects of the present invention, it is possible to provide a power supply device including the first and second capacitors having various configurations in accordance with safety standards.

  According to the nineteenth aspect of the present invention, by arranging two common mode choke coils with their terminals aligned, noise is generated in the other power supply wiring due to noise superimposed on one power supply wiring. Can be prevented.

  According to the twentieth aspect of the invention, by providing one of the two common mode choke coils on the circuit board and the other outside the circuit board, the two common mode choke coils are not increased in size without increasing the size of the circuit board. The choke coil can be arranged with the terminal positions aligned.

  According to the twenty-first aspect, by electrically shielding one common mode choke coil and a part of the two power supply wires connected to the common mode choke coil, noise is superimposed on the one power supply wire. It is possible to prevent noise from occurring in the other power supply wiring.

  According to the twenty-second aspect of the invention, the slits are provided between the third and fourth power supply wirings and the common mode choke coil on the circuit board, so that the size of the circuit board can be increased without increasing the size of the circuit board. The common mode choke coil can be arranged with a sufficient creepage distance from the power supply wiring.

  According to the twenty-third or twenty-fourth invention, the two connection points are electrically connected to a casing (or a heat sink) having a large size and a stable potential, thereby changing the potential of the two connection points. Can be effectively suppressed, and common mode noise can be effectively suppressed.

  According to the twenty-fifth aspect, by arranging the first to fourth capacitors on the same side of the converter, the connection point of the first and second capacitors and the connection point of the third and fourth capacitors are brought close to each other, Parasitic inductance generated between two connection points can be reduced, and common mode noise can be suppressed.

  According to the twenty-sixth aspect of the invention, the same effect as that of the first aspect of the invention can be achieved with respect to the power supply device that converts the input alternating voltage into a direct-current voltage and outputs it.

  According to the twenty-seventh aspect of the present invention, the same effect as that of the first aspect of the invention can be achieved with respect to the power supply apparatus that converts the input direct-current voltage into a different level of direct-current voltage and outputs it.

1 is a circuit diagram of a power supply device according to a first embodiment of the present invention. It is a top view which shows a part of circuit board of the power supply device shown in FIG. It is a figure which shows the example of the connection form of the Y capacitor based on a safety standard. It is a circuit diagram of the power supply device concerning the 1st modification of a 1st embodiment. It is a top view which shows a part of circuit board of the power supply device shown in FIG. It is a circuit diagram of the power supply device concerning the 2nd modification of a 1st embodiment. It is a top view which shows a part of circuit board of the power supply device shown in FIG. It is a top view which shows a part of circuit board of the power supply device which concerns on the 3rd modification of 1st Embodiment. It is a top view which shows a part of circuit board of the power supply device which concerns on the 4th modification of 1st Embodiment. It is a circuit diagram of the power supply device which concerns on the 2nd Embodiment of this invention. It is sectional drawing of the power supply device shown in FIG. It is a top view which shows a part of circuit board of the power supply device shown in FIG. It is a circuit diagram of the power supply device concerning the modification of a 2nd embodiment. It is a top view which shows a part of circuit board of the power supply device shown in FIG. It is sectional drawing of the power supply device which concerns on the 3rd Embodiment of this invention. It is a top view which shows a part of circuit board of the power supply device shown in FIG. It is a top view which shows a part of circuit board of the power supply device which concerns on the 1st modification of 3rd Embodiment. It is a top view which shows a part of circuit board of the power supply device which concerns on the 2nd modification of 3rd Embodiment. It is sectional drawing of the power supply device which concerns on the 3rd modification of 3rd Embodiment. It is a top view which shows a part of circuit board of the power supply device shown in FIG. It is a top view which shows a part of circuit board of the power supply device which concerns on the 4th Embodiment of this invention. It is a top view which shows a part of circuit board of the power supply device which concerns on a comparative example. It is sectional drawing of the power supply device which concerns on the modification of 4th Embodiment. It is a top view which shows a part of circuit board of the power supply device which concerns on the 5th Embodiment of this invention. It is a circuit diagram of the power supply device which concerns on the 6th Embodiment of this invention. FIG. 26 is a plan view illustrating a part of the circuit board of the power supply device illustrated in FIG. 25. It is a circuit diagram of the power supply device which concerns on the 7th Embodiment of this invention. It is a circuit diagram of the power supply device which concerns on the 8th Embodiment of this invention. It is sectional drawing of the power supply device shown in FIG. It is a circuit diagram of the power supply device which concerns on the 9th Embodiment of this invention. It is sectional drawing of the power supply device shown in FIG. It is a circuit diagram of the conventional power supply device. It is a figure which shows the parasitic inductance which generate | occur | produces in the power supply device shown in FIG.

(First embodiment)
FIG. 1 is a circuit diagram of a power supply device according to the first embodiment of the present invention. The power supply device 1 shown in FIG. 1 includes a converter 10, capacitors 11 to 14, common mode choke coils 15 and 16, input terminals A1 and A2, and output terminals A3 and A4. Converter 10, capacitors 11 to 14, and common mode choke coils 15 and 16 are mounted on circuit board 17. The circuit board 17 is a double-sided board that can form wiring on both sides. The circuit board 17 is housed in a metal housing 18 and shielded by the housing 18.

  The power supply device 1 converts the voltage input from the input terminals A1 and A2, and outputs the converted voltage from the output terminals A3 and A4. An AC power supply 101 is connected to the input side of the power supply device 1, and a load 102 is connected to the output side of the power supply device 1. The input terminals A1 and A2 are connected to two terminals of the AC power source 101, respectively, and the output terminals A3 and A4 are connected to two terminals of the load 102, respectively. The power supply device 1 converts the AC voltage supplied from the AC power source 101 into a DC voltage of a predetermined level, and applies the converted DC voltage to the load 102.

  The converter 10 is an insulated AC / DC converter including a diode bridge, a switching element, a transformer, an electrolytic capacitor (all not shown), and the like. Converter 10 has primary side terminals B1 and B2 and secondary side terminals B3 and B4. Converter 10 converts the AC voltage input from primary terminals B1 and B2 into a DC voltage, and outputs the converted DC voltage from secondary terminals B3 and B4. Input terminals A1 and A2 are connected to primary terminals B1 and B2, respectively, and output terminals A3 and A4 are connected to secondary terminals B3 and B4, respectively.

  Input terminals A1 and A2 and output terminals A3 and A4 are connected to converter 10 using four power supply wires. The input terminal A1 and the primary terminal B1 are connected using an L wiring (live line) 21. The input terminal A2 and the primary side terminal B2 are connected using an N wiring (neutral line) 22. The output terminal A3 and the secondary side terminal B3 are connected using a P wiring (plus side line) 23. The output terminal A4 and the secondary terminal B4 are connected using a G wiring (ground line) 24. The L wiring 21 and the N wiring 22 are AC power wiring, and the P wiring 23 and the G wiring 24 are DC power wiring.

  Capacitors 11 to 14 and common mode choke coils 15 and 16 are provided to suppress noise in converter 10. The capacitors 11 and 12 are connected in series, and are provided between the L wiring 21 and the N wiring 22. The capacitors 13 and 14 are connected in series and are provided between the P wiring 23 and the G wiring 24. One terminals of the capacitors 11 to 14 are connected to the L wiring 21, the N wiring 22, the P wiring 23, and the G wiring 24, respectively. The connection points of the capacitors 11 and 12 and the connection points of the capacitors 13 and 14 are connected using connection wiring (details will be described later). In this way, the other terminals of the capacitors 11 to 14 are electrically connected using the connection wiring. The capacitors 11 to 14 function as Y capacitors.

  The common mode choke coil 15 includes first to fourth terminals, a coil provided between the first and second terminals, and a coil provided between the third and fourth terminals. The common mode choke coil 15 is provided on the L wiring 21 and the N wiring 22 closer to the converter 10 than the capacitors 11 and 12. The first to fourth terminals of the common mode choke coil 15 are connected to the input terminal A1, the primary side terminal B1, the input terminal A2, and the primary side terminal B2, respectively. The L wiring 21 branches between the input terminal A <b> 1 and the first terminal of the common mode choke coil 15 in order to connect to the capacitor 11. The N wiring 22 branches between the input terminal A 2 and the third terminal of the common mode choke coil 15 in order to connect to the capacitor 12.

  Similar to the common mode choke coil 15, the common mode choke coil 16 has four terminals and two coils. The common mode choke coil 16 is provided on the P wiring 23 and the G wiring 24 closer to the converter 10 than the capacitors 13 and 14. The first to fourth terminals of the common mode choke coil 16 are connected to the secondary terminal B3, the output terminal A3, the secondary terminal B4, and the output terminal A4, respectively. The P wiring 23 branches between the second terminal of the common mode choke coil 16 and the output terminal A3 in order to connect to the capacitor 13. The G wiring 24 branches between the fourth terminal of the common mode choke coil 16 and the output terminal A4 in order to connect to the capacitor 14.

  In the drawing, the black circles attached to the common mode choke coils 15 and 16 indicate the winding start side of the coils. The common mode choke coil 15 is provided such that the input terminals A1 and A2 are on the coil winding start side. The common mode choke coil 16 is provided so that the secondary terminals B3 and B4 side of the converter 10 are on the winding start side of the coil.

  FIG. 2 is a plan view showing a part of the circuit board 17. FIG. 2 shows a pattern formed on the front surface of the circuit board 17 and a pattern formed on the back surface of the circuit board 17. The pattern formed on the back surface is described behind the pattern formed on the front surface. When the two types of patterns have the same planar position, the pattern formed on the back surface is written at a position slightly shifted to the right or above from the original position. In FIG. 2, rectangles denoted by reference numerals 11 to 14 represent positions where the capacitors 11 to 14 are arranged, and small circles represent through holes for inserting terminals (legs) of electronic components. Input terminals A1 and A2 and output terminals A3 and A4 are located on the left side of the portion shown in FIG. 2, and converter 10 is located on the right side of the portion shown in FIG.

  The L wiring 21 and the P wiring 23 are formed on the front surface of the circuit board 17, and the N wiring 22 and the G wiring 24 are formed on the back surface of the circuit board 17. Each of the four power supply wirings has a main part extending in a predetermined direction (horizontal direction in FIG. 2) and a branching part branched from the main part. The main part of the L wiring 21 and the main part of the N wiring 22 are formed at the same plane position, and the main part of the P wiring 23 and the main part of the G wiring 24 are formed at the same plane position.

  One terminals of the capacitors 11 to 14 are connected to branch portions of the L wiring 21, the N wiring 22, the P wiring 23, and the G wiring 24, respectively. On the surface of the circuit board 17, connection wirings 31 (H-shaped patterns) having four end portions are formed. The other terminals of the capacitors 11 to 14 are connected to the four ends of the connection wiring 31, respectively. Thereby, the other terminals of the capacitors 11 to 14 are electrically connected.

  The arrangement positions of the capacitors 11 to 14 have the following characteristics. Capacitors 11 to 14 are arranged close to circuit board 17. Capacitors 11 to 14 are arranged on the same side (left side in FIG. 1) of converter 10 in a planar position on circuit board 17. Capacitors 11 to 14 are arranged such that a connection point between capacitors 11 and 12 and a connection point between capacitors 13 and 14 are located on the same side of converter 10 in a planar position. The capacitors 11 to 14 are arranged so that the connection point of the capacitors 11 and 12 and the connection point of the capacitors 13 and 14 are close to each other. The power supply device (the power supply device 1 and various power supply devices described later) of the present invention has these characteristics. According to the power supply device having these characteristics, common mode noise can be effectively suppressed without increasing the cost and the circuit amount (details will be described later).

  In order to use electronic devices safely, safety standards corresponding to the types of electronic devices have been established by IEC (International Electrotechnical Commission). For example, IEC 60950 is a safety standard for information technology equipment, and IEC 60065 is a safety standard for audio, video, and similar electronic equipment. In the power supply device 1 that complies with these safety standards, in many cases, it is necessary to use a safety standard certified product for the capacitors 11 and 12. As for the capacitors 13 and 14, there are a case where a safety standard certified product needs to be used and a normal product (a product which is not a safety standard certified product) may be used. When a normal product is used, a chip capacitor having a small occupation area on the circuit board can be used.

  FIG. 3 is a diagram showing an example of the connection form of the Y capacitor compliant with the safety standard. Here, a case is considered in which a Y capacitor connected in series is provided between the two AC power supply wires W1 and W2, and the connection point Nc of the capacitor is connected to the frame ground. For example, it is assumed that a Y capacitor equivalent to 1000 pF is inserted between the AC power supply wires W1 and W2 and the frame ground as a whole. In IEC60950, one capacitor having a capacitance of 470 pF may be provided between the AC power supply wires W1 and W2 and the connection point Nc one by one (FIG. 3A). In IEC 60065, in order to increase safety, it is necessary to provide two capacitors each having a capacity of 1000 pF between the AC power supply wirings W1 and W2 and the connection point Nc (FIG. 3B). In IEC 60065, in order to reduce the number of parts, a circuit in which two capacitors having a capacity of 1000 pF and one capacitor having a capacity of 2000 pF are connected in the form shown in FIG. 3C can be used.

  The four power supply wirings 21 to 24 and the connection wiring 31 are arranged with a distance satisfying the safety standard corresponding to the application of the power supply device 1. Specifically, the distance d2 between the two AC power supply wirings, the distance d2 between the two DC power supply wirings, the distance d3 between the AC power supply wiring and the DC power supply wiring, and the connection wiring 31 The distance d4 between the other wirings is determined so as to satisfy the safety standard. For example, in the power supply device 1 conforming to IEC60065, the distance d1 is determined to be 3 mm or more, the distance d2 is set to 1 mm or more, the distance d3 is set to 7 mm or more, and the distance d4 is set to 3.5 mm or more.

  In the power supply device 1, the connection points of the capacitors 11 to 14 are not electrically connected to the casing 18 (the part touched by the user). Therefore, even when conforming to IEC 60065, the connection form shown in FIG. 3A can be used. However, in this case, it is necessary to use a safety standard certified product not only for the capacitors 11 and 12 but also for the capacitors 13 and 14.

  In FIG. 2, it is preferable that the capacitors 11 and 12 are arranged at symmetrical positions, and the capacitors 13 and 14 are also arranged at symmetrical positions. Specifically, it is preferable that the lengths of the branch portions are equal in the L wiring 21 and the N wiring 22, and the lengths of the branch portions are also equal in the P wiring 23 and the G wiring 24.

  In the power supply device 1, the other ends of the capacitors 11 to 14 are electrically connected. That is, the connection point of the capacitors 11 and 12 and the connection point of the capacitors 13 and 14 are electrically connected. For this reason, compared with the case where two connection points are not electrically connected, the fluctuation | variation of the electric potential of two connection points can be suppressed. Capacitors 11 to 14 are arranged on the same side of converter 10 at a planar position close to circuit board 17. For this reason, the parasitic inductance which generate | occur | produces between two connection points can be reduced, and common mode noise can be suppressed. The other terminals of the capacitors 11 to 14 are electrically connected using the connection wiring 31. Even if the connection wiring 31 is formed on the circuit board 17, the cost and the circuit amount of the power supply device 1 hardly increase. Therefore, according to the power supply device 1 according to the present embodiment, it is possible to suppress common mode noise without increasing cost and circuit amount.

  As described above, the power supply device 1 according to this embodiment converts the AC voltage input from the first and second terminals (input terminals A1 and A2), and converts the converted DC voltage to the third and fourth terminals. Output from the terminals (output terminals A3, A4). The power supply device 1 is disposed on a circuit board 17 and has a converter 10 that converts a voltage, and one terminal that has first to fourth power lines (L wiring 21) that connects the first to fourth terminals and the converter 10. , N wiring 22, P wiring 23, and G wiring 24), and first to fourth capacitors 11 to 14 connected to each other. The first to fourth capacitors 11 to 14 are disposed close to the circuit board 17, and the other terminals of the first to fourth capacitors 11 to 14 are electrically connected. First to fourth capacitors 11 to 14 are arranged on the same side of converter 10 in a planar position on circuit board 17.

  In this way, by electrically connecting the connection point of the first and second capacitors 11 and 12 and the connection point of the third and fourth capacitors 13 and 14, fluctuations in potential at the two connection points are suppressed. be able to. Further, by arranging the first to fourth capacitors 11 to 14 close to each other, the other terminals of the first to fourth capacitors 11 to 14 can be easily electrically connected at low cost and two connections can be made. Parasitic inductance generated between points can be reduced and common mode noise can be suppressed. Therefore, according to the power supply device 1 according to the present embodiment, it is possible to suppress common mode noise without increasing cost and circuit amount.

  In addition, the circuit board 17 is a double-sided board capable of forming wiring on both sides, and the other terminals of the first to fourth capacitors 11 to 14 are formed on only one side (front surface) of the circuit board 17. The connection wiring 31 is connected. Therefore, the power supply device 1 is miniaturized using the double-sided board, and the other terminals of the first to fourth capacitors 11 to 14 are connected to one connection wiring 31 formed on one side of the double-sided board. Thus, the other terminals of the first to fourth capacitors 11 to 14 can be easily electrically connected at low cost.

  The circuit board 17 is formed with a connection wiring 31 for connecting the other terminals of the first to fourth capacitors 11 to 14. The first to fourth power supply wirings and the connection wiring 31 are connected to the circuit board. 17 is arranged at a distance satisfying the safety standard. Thereby, the power supply device 1 based on a safety standard can be provided. Each of the first and second capacitors 11 and 12 is composed of a single capacitor. Thereby, the power supply device 1 provided with the 1st and 2nd capacitor | condensers 11 and 12 which have the structure based on a safety standard can be provided. The converter 10 is an AC / DC converter that converts an AC voltage into a DC voltage. Therefore, the above effect can be achieved for the power supply device 1 that converts the input AC voltage into a DC voltage and outputs the DC voltage.

  About the power supply device 1 which concerns on this embodiment, the following modifications can be comprised. FIG. 4 is a circuit diagram of a power supply device according to a first modification. A power supply device 2 shown in FIG. 4 is obtained by replacing the capacitors 11 and 12 with two capacitors connected in series in the power supply device 1. In the power supply device 2, the connection form shown in FIG.

  FIG. 5 is a plan view showing a part of the circuit board 17 of the power supply device 2. Hereinafter, in the plan view of the circuit board, the description of the common mode choke coils 15 and 16 may be omitted. As shown in FIG. 5, on the surface of the circuit board 17, in addition to the L wiring 21 and the P wiring 23, a connection wiring 31 (H-shaped pattern) having four ends and connection wirings 32 and 33 (rectangular) Pattern).

  One terminal of each of the capacitors 11a, 12a, 13, and 14 is connected to a branch portion of the L wiring 21, the N wiring 22, the P wiring 23, and the G wiring 24, respectively. The other terminals of the capacitors 11a and 12a are connected to one ends of connection wires 32 and 33, respectively. One terminals of the capacitors 11b and 12b are connected to the other ends of the connection wirings 32 and 33, respectively. The other terminals of the capacitors 11b, 12b, 13, and 14 are connected to the four ends of the connection wiring 31, respectively. Thereby, the other terminals of the capacitors 11b, 12b, 13, and 14 are electrically connected.

  The four power supply wirings 21 to 24 and the connection wirings 31 to 33 are arranged with a distance satisfying the safety standard corresponding to the application of the power supply device 2. For example, in the power supply device 2 conforming to IEC60065, the distance d4 between the connection wiring 32 and other wiring is determined to be 3.5 mm or more.

  In the first modification, the two capacitors 11a and 11b connected in series correspond to the first capacitor, and the two capacitors 12a and 12b connected in series correspond to the second capacitor. Thus, in the first modification, the first and second capacitors are each composed of two capacitors connected in series. According to the power supply device 2 according to the first modification, the same effect as that of the power supply device 1 according to the first embodiment can be obtained. In addition, it is possible to provide a power supply device 2 that includes first and second capacitors that conform to safety standards and have a configuration different from that of the first embodiment.

  FIG. 6 is a circuit diagram of a power supply device according to a second modification. A power supply device 3 shown in FIG. 6 is obtained by replacing the capacitors 11 and 12 with three capacitors 11a, 11b, and 12b in the power supply device 1. In the power supply device 3, the connection form shown in FIG. The capacitors 13 and 14 are normal chip capacitors that are not safety standard certified products.

  FIG. 7 is a plan view showing a part of the circuit board 17 of the power supply device 3. As shown in FIG. 7, on the surface of the circuit board 17, in addition to the L wiring 21 and the P wiring 23, a connection wiring 34 (Y-shaped pattern) having three ends and a connection wiring 35 (rectangular pattern) ) And are formed. In addition to the N wiring 22 and the G wiring 24, a connection wiring 41 (rectangular pattern) is formed on the back surface of the circuit board 17.

  One terminal of each of the capacitors 11a, 12a, 13, and 14 is connected to a branch portion of the L wiring 21, the N wiring 22, the P wiring 23, and the G wiring 24, respectively. The other terminal of the capacitor 11a, the other terminal of the capacitor 12a, and one terminal of the capacitor 11b are connected to the three ends of the connection wiring 34, respectively. The other terminal of the capacitor 11 b is connected to one end of the connection wiring 35. The other terminal of the capacitor 13 is connected to the other end of the connection wiring 35. The other terminal of the capacitor 14 is connected to one end of the connection wiring 41. The connection wirings 35 and 41 are formed so as to have an overlapping portion at a planar position. One or more through holes 51 are formed in the overlapping portion of the connection wirings 35 and 41. The connection wirings 35 and 41 are electrically connected through the through hole 51. Thereby, the other terminals of the capacitors 11b, 13, and 14 are electrically connected.

  The four power supply wires 21 to 24 and the connection wires 34 and 35 are arranged with a distance satisfying the safety standard corresponding to the application of the power supply device 3. For example, in the power supply device 3 conforming to IEC 60065, the distance d1 between the two AC power supply wires is determined to be 3 mm or more, and the distance d4 between the connection wire 34 and other wires is determined to be 3.5 mm or more.

  In the second modification, the connection wiring is between the first connection wiring 35 formed on one surface (front surface) of the circuit board 17 and the first connection wiring 35 on the other surface (back surface) of the circuit board 17. And the second connection wiring 41 formed so as to have an overlapping portion. The first and second connection wirings 35 and 41 are electrically connected using a through hole 51 formed in the overlapping portion. Thereby, the other terminals of the first to fourth capacitors 11 to 14 can be easily electrically connected.

  In the second modification, the two capacitors 11a and 11b connected in series correspond to the first capacitor, the two capacitors 11b and 12a connected in series correspond to the second capacitor, and the capacitor 11b is common. It corresponds to a capacitor. As described above, in the third modification, the first capacitor 11 includes the two capacitors 11a and 11b connected in series including the common capacitor 11b, and the second capacitor 12 includes the common capacitor 11b. The two capacitors 11b and 12a are connected in series. According to the power supply device 3 according to the second modification, the same effect as that of the power supply device 1 according to the first embodiment can be obtained. Further, it is possible to provide the power supply device 3 including the first and second capacitors that conform to the safety standard and have a configuration different from that of the first embodiment and the first modification.

  The power supply device according to the third modification has the same configuration as the power supply device 1 shown in FIG. However, the capacitors 13 and 14 are normal chip capacitors. FIG. 8 is a plan view showing a part of the circuit board 17 according to the third modification. As shown in FIG. 8, in addition to the L wiring 21 and the P wiring 23, a connection wiring 36 (Y-type pattern) having three end portions is formed on the surface of the circuit board 17. In addition to the N wiring 22 and the G wiring 24, a connection wiring 41 (rectangular pattern) is formed on the back surface of the circuit board 17.

  The capacitor 13 is mounted on the front surface of the circuit board 17, and the capacitor 14 is mounted on the back surface of the circuit board. The capacitors 13 and 14 are mounted at the same planar position. One terminals of the capacitors 11 to 14 are connected to branch portions of the L wiring 21, the N wiring 22, the P wiring 23, and the G wiring 24, respectively. The other terminals of the capacitors 11 to 13 are respectively connected to the three ends of the connection wiring 36. The other terminal of the capacitor 14 is connected to one end of the connection wiring 41. The connection wirings 36 and 41 are formed so as to have an overlapping portion at a planar position. One or more through holes 52 are formed in the overlapping portion of the connection wirings 36 and 41. The connection wirings 36 and 41 are electrically connected through the through hole 52. Thereby, the other terminals of the capacitors 11 to 14 are electrically connected.

  The power supply device according to the fourth modification has the same configuration as the power supply device 1 shown in FIG. However, the capacitors 11 to 14 are normal chip capacitors. In the fourth modification, for example, a power supply device that does not need to comply with safety standards is assumed because the AC power supply 101 is insulated from the ground. FIG. 9 is a plan view showing a part of the circuit board 17 according to the fourth modification. As shown in FIG. 9, a connection wiring 37 (rectangular pattern) is formed on the surface of the circuit board 17 in addition to the L wiring 21 and the P wiring 23. In addition to the N wiring 22 and the G wiring 24, a connection wiring 42 (rectangular pattern) is formed on the back surface of the circuit board 17. The connection wirings 37 and 42 are formed at the same plane position.

  The capacitors 11 and 13 are mounted on the front surface of the circuit board 17, and the capacitors 12 and 14 are mounted on the back surface of the circuit board 17. The capacitors 11 and 13 are mounted at the same planar position as the capacitors 12 and 14, respectively. One terminals of the capacitors 11 to 14 are connected to branch portions of the L wiring 21, the N wiring 22, the P wiring 23, and the G wiring 24, respectively. The other terminals of the capacitors 11 to 14 are connected to one end of the connection wiring 37, one end of the connection wiring 42, the other end of the connection wiring 37, and the other end of the connection wiring 42, respectively. One or more through holes 53 are formed at the positions where the connection wirings 37 and 42 are arranged. The connection wirings 37 and 42 are electrically connected through the through hole 53. Thereby, the other terminals of the capacitors 11 to 14 are electrically connected.

  In the fourth modification, the thickness of the circuit board 17 is determined so as to satisfy the safety standard in order to ensure insulation. For example, the thickness of the circuit board 17 is determined to be 0.4 mm or more. In FIG. 9, the lengths of the branch portions are preferably equal in the L wiring 21 and the N wiring 22, and the lengths of the branch portions are preferably equal in the P wiring 23 and the G wiring 24.

  In the third modification, the connection wiring 36 formed on the front surface of the circuit board 17 and the connection wiring 41 formed on the back surface of the circuit board 17 are electrically connected using the through holes 52. In this case, the connection wirings 36 and 41 and the through hole 52 can be regarded as one connection wiring formed on both surfaces of the circuit board 17. Therefore, in the third modified example, the other terminals of the first to fourth capacitors 11 to 14 are connected to one connection wiring formed on both surfaces of the circuit board 17. For the same reason, also in the fourth modification, the other terminals of the first to fourth capacitors 11 to 14 are connected to one connection wiring formed on both surfaces of the circuit board 17.

  In the power supply device according to the first embodiment and the modification thereof, the main part of the L wiring 21 and the main part of the N wiring 22 may be arranged at different plane positions, and the main part of the P wiring 23 and the G wiring. You may arrange | position 24 main parts in a different plane position. Alternatively, the L wiring 21 and the P wiring 23 may be disposed on the back surface of the circuit board 17, and the N wiring 22 and the G wiring 24 may be disposed on the surface of the circuit board 17. Further, when the connection wiring is formed only on one surface of the circuit board 17, the connection wiring may be formed on the opposite surface of the circuit board 17. When the connection wiring is formed on both surfaces of the circuit board 17, the surface on which the connection wiring is formed may be reversed. These points are also the same in a power supply device including a double-sided substrate described later. Further, as shown in the figure, the shape of the connection wiring may be arbitrary as long as the terminals of the capacitor can be connected. This is the same for all power supply devices described later. Further, in order to electrically connect the connection wiring formed on both surfaces of the circuit board 17, a through hole (the inner surface may not be covered with a conductor) is formed in the circuit board 17, and the formed through hole Metal pins may be inserted, reflow soldering may be performed on the back surface of the circuit board 17, and soldering may be performed on the surface of the circuit board 17.

  Although the connection wiring 31 shown in FIG. 2 is an H-type pattern, the connection wiring 31 may be an X-type pattern, for example. In accordance with the configuration of the power supply device, the shape of the connection wiring may be determined so as to reduce the parasitic inductance. In the power supply apparatus described above, a double-sided board is used. Alternatively, a multilayer board (for example, a four-layer board) capable of forming wirings in three or more layers may be used. When using a multilayer substrate, for example, the L wiring 21 and the like may be formed in an inner layer pattern. When a multilayer substrate is used, as described above, each layer may be separated by an insulating layer having a thickness of 0.4 mm or more, and a pattern or a through hole of each layer may be arranged with a distance satisfying safety standards.

  Although the example of the safe distance in the power supply device based on IEC60065 and IEC60950 was shown, the safe distance in a power supply device is not limited to the illustrated numerical value. Safety standards may be revised. When the safety standard is revised, the power supply device may be designed in accordance with the revised safety standard. Moreover, although the example of the capacity | capacitance of a Y capacitor was shown in FIG. 3, the capacity value of the Y capacitor contained in a power supply device is not limited to the illustrated numerical value. Since the high-frequency current flowing through the Y capacitor causes an electric shock accident, it is necessary to determine the capacitance value of the Y capacitor within a range in which a person does not get an electric shock. In the power supply device described above, the lead type of the safety standard certified product is used as the Y capacitor, but a chip type of the safety standard certified product may be used instead. In this case, the capacitor 11 connected to the L wiring 21 and the capacitor 12 connected to the N wiring 22 may be arranged at the same planar position on the front surface and the back surface of the circuit board.

(Second Embodiment)
FIG. 10 is a circuit diagram of a power supply device according to the second embodiment of the present invention. The power supply device 4 shown in FIG. 10 is obtained by connecting the connection points of the capacitors 11 to 14 to the casing 18 (frame ground) in the power supply device 1 shown in FIG. FIG. 11 is a cross-sectional view of the power supply device 4. FIG. 12 is a plan view showing a part of the circuit board 17 of the power supply device 4. As shown in FIG. 12, capacitors 11 to 14, four power supply wirings 21 to 24, and connection wiring 31 are connected in the same manner as in the first embodiment (FIG. 2).

  In the circuit board 17, a through hole 62 for passing the screw 61 is formed at the arrangement position of the connection wiring 31. The inner surface of the through hole 62 may be covered with a conductor or may not be covered with a conductor. Metal posts 63 are provided at positions corresponding to the through holes 62. One end (upper end in FIG. 11) of the column 63 is located in the vicinity of the through hole 62 (directly below in FIG. 11). The other end of the column 63 is fixed to the housing 18 that houses the circuit board 17.

  A female screw is formed at one end of the column 63. The screw 61 is inserted into the through hole 62 and is screwed with a female screw formed at one end of the column 63. The screw 61 contacts the connection wiring 31 formed on the surface of the circuit board 17 and the support 63, and the support 63 contacts the housing 18. Therefore, the connection wiring 31 and the other terminals of the capacitors 11 to 14 are electrically connected to the housing 18.

  The four power supply wirings 21 to 24 and the connection wiring 31 are arranged at a distance satisfying the safety standard corresponding to the application of the power supply device 4. In the power supply device 4, the connection points of the capacitors 11 and 12 and the connection points of the capacitors 13 and 14 are electrically connected to the housing 18 that is touched by the user. In consideration of this point, for example, in the power supply device 4 conforming to IEC60950, the distance d5 between the AC power supply wiring and the connection wiring 31 is 7 mm or more, and the distance d6 between the DC power supply wiring and the connection wiring 31 is 1 mm. Determined above. In the power supply device 4, normal products can be used for the capacitors 13 and 14.

  As described above, in the power supply device 2 according to the present embodiment, the circuit board 17 is housed in the metal casing 18 and has the through holes 62 formed at the positions where the connection wirings 31 are arranged. A female screw is formed at one end using a screw 61 inserted into 62, and the other end is screwed to a metal support 63 fixed to the housing 18. In this way, by screwing the circuit board 17 to the column 63 fixed to the casing 18 at the position where the connection wiring 31 is arranged, the other terminals of the first to fourth capacitors 11 to 14 are electrically connected to the casing 18. Can be connected to. By connecting the connection points of the capacitors 11 and 12 and the connection points of the capacitors 13 and 14 to the casing 18 having a large size and a stable potential, the potential fluctuations at the two connection points can be effectively suppressed, Common mode noise can be effectively suppressed.

  In the power supply device 4, the connection wiring 31 may be formed on the back surface of the circuit board 17. Even in this case, since the connection wiring 31 is in contact with one end of the column 63, the connection wiring 31 and the other terminals of the capacitors 11 to 14 are electrically connected to the housing 18.

  About the power supply device 4 which concerns on this embodiment, the following modifications can be comprised. FIG. 13 is a circuit diagram of a power supply device according to a modification. The power supply device 5 shown in FIG. 13 is obtained by connecting the connection points of the capacitors 11b, 13 and 14 to the housing 18 in the power supply device 3 shown in FIG. FIG. 14 is a plan view showing a part of the circuit board 17 of the power supply device 5. As shown in FIG. 14, capacitors 11 to 14, four power supply wires 21 to 24, and connection wires 34, 35, and 41 are connected in the same manner as in the second modified example (FIG. 7) of the first embodiment. Is done. However, a through hole for electrically connecting the connection wirings 35 and 41 is not formed in the circuit board 17.

  In the circuit board 17, a through hole (not shown) is formed in the overlapping portion of the connection wirings 35 and 41 in place of the through hole. As in the second embodiment, the screw 61 is inserted into the through hole and screwed with a female screw formed at one end of a support column (not shown). The screw 61 is in contact with the connection wiring 35 and the support column formed on the surface of the circuit board 17. The column is fixed to the housing 18 and contacts the connection wiring 41 formed on the back surface of the circuit board 17. Therefore, the connection wirings 35 and 41 and the other terminals of the capacitors 11 b, 13 and 14 are electrically connected to the housing 18. In FIG. 14, it is preferable to arrange the capacitors 11a and 12a at symmetrical positions. Specifically, it is preferable that the lengths of the branch portions are equal in the L wiring 21 and the N wiring 22.

  In the power supply device 5 according to this modification, the circuit board 17 is housed in the metal casing 18 and has a through hole formed in an overlapping portion of the first and second connection wirings 35 and 41. A female screw is formed at one end using the screw 61 inserted into the housing, and the other end is screwed to a metal column fixed to the housing 18. In this way, the other terminals of the first to fourth capacitors 11 to 14 are connected to each other by screwing the circuit board 17 to the column fixed to the housing 18 at the overlapping portion of the first and second connection wirings 35 and 41. It can be electrically connected to the housing 18. By connecting the connection points of the capacitors 11 and 12 and the connection points of the capacitors 13 and 14 to the casing 18 having a large size and a stable potential, the potential fluctuations at the two connection points can be effectively suppressed, Common mode noise can be effectively suppressed.

  In the power supply device 2 according to the first modification of the first embodiment, the other terminals of the capacitors 11b, 12b, 13, and 14 are secured by screwing the circuit board 17 to the support at the position where the connection wiring 31 is disposed. May be electrically connected to the housing 18. Further, in the power supply device according to the third modified example (fourth modified example) of the first embodiment, the circuit board 17 is screwed to the support column at the arrangement position of the connection wirings 36 and 41 (connection wirings 37 and 42). Thus, the connection points of the capacitors 11 to 14 may be connected to the housing 18.

(Third embodiment)
The power supply device according to the third embodiment of the present invention has the same configuration as the power supply device 4 shown in FIG. In this embodiment, a single-sided substrate that can form wiring only on one side (back side) is used as the circuit board. FIG. 15 is a cross-sectional view of the power supply device according to the present embodiment. In FIG. 15, the circuit board 19 is a single-sided board. FIG. 16 is a plan view showing a part of the circuit board 19 according to the present embodiment. As shown in FIG. 16, in addition to the L wiring 21, the N wiring 22, the P wiring 23, and the G wiring 24, connection wirings 43 and 44 (rectangular pattern) are formed on the back surface of the circuit board 19. . One terminals of the capacitors 11 to 14 are connected to branch portions of the L wiring 21, the N wiring 22, the P wiring 23, and the G wiring 24, respectively. The other terminals of the capacitors 11 to 14 are connected to one end of the connection wiring 43, the other end of the connection wiring 43, one end of the connection wiring 44, and the other end of the connection wiring 44, respectively.

  In the circuit board 19, through holes 62 a and 62 b are formed at the arrangement positions of the connection wirings 43 and 44, respectively. Metal posts 63a and 63b are provided at positions corresponding to the through holes 62a and 62b, respectively. The screw 61a is inserted into the through hole 62a and is screwed with a female screw formed at one end of the support 63a. The support 63 a contacts the connection wiring 43 formed on the back surface of the circuit board 19. The screw 61b is inserted into the through hole 62b and screwed with a female screw formed at one end of the support column 63b. The support 63 b contacts the connection wiring 44 formed on the back surface of the circuit board 19. Therefore, the connection wirings 44 and 45 and the other terminals of the capacitors 11 to 14 are electrically connected to the housing 18.

  The four power supply wires 21 to 24 and the connection wires 43 and 44 are arranged with a distance satisfying the safety standard corresponding to the application of the power supply device according to the present embodiment. For example, in a power supply device conforming to IEC 60065, the distance d1 between two AC power supply wirings is 3 mm or more, the distance d3 between the AC power supply wiring and the DC power supply wiring is 7 mm or more, and between the connection wiring 44 and another wiring. The distance d4 is determined to be 7 mm or more.

  As described above, in the power supply device according to the present embodiment, the circuit board 19 is a single-sided board that can form wiring on one side. The other terminals of the first and second capacitors 11 and 12 are connected to the first connection wiring 43 formed on the circuit board 19, and the other terminals of the third and fourth capacitors 13 and 14 are connected to the circuit board 19. It is connected to the formed second connection wiring 44. The circuit board 19 is housed in the metal casing 18 and has through holes 62a and 62b at the positions where the first and second connection wirings 43 and 44 are arranged, and screws 61a inserted into the through holes 62a and 62b. 61b, a female screw is formed at one end, and the other end is screwed to metal columns 63a and 63b fixed to the housing. Thus, the other terminals of the first to fourth capacitors 11 to 14 are connected to the first and second connection wirings 43 and 44 formed on the single-sided substrate, and the arrangement positions of the first and second connection wirings 43 and 44 are arranged. Then, the other terminals of the first to fourth capacitors 11 to 14 can be electrically connected to the casing 18 by screwing the circuit board 19 to the columns 63 a and 63 b fixed to the casing 18. In addition, by connecting the connection points of the capacitors 11 and 12 and the connection points of the capacitors 13 and 14 to the casing 18 having a large size and a stable potential, fluctuations in potential at the two connection points are effectively suppressed. In addition, common mode noise can be effectively suppressed.

  About the power supply device which concerns on this embodiment, the following modifications can be comprised. The power supply device according to the first modification has a configuration in which the connection points of the capacitors 11b, 12b, 13, 14 are connected to the housing 18 in the power supply device 2 shown in FIG. FIG. 17 is a plan view showing a part of a circuit board according to a first modification. As shown in FIG. 17, in addition to the L wiring 21, the N wiring 22, the P wiring 23, and the G wiring 24, connection wirings 43 to 46 (rectangular pattern) are formed on the back surface of the circuit board 19. . Since the shape of the G wiring 24 and the connection wiring 44 and the arrangement positions of the capacitors 13 and 14 are the same as those in FIG. 16, FIG. 17 shows the description of the G wiring 24, the connection wiring 44, and the capacitors 13 and 14. Omitted.

  One ends of the capacitors 11a and 12a are connected to branch portions of the L wiring 21 and the N wiring 22, respectively. The other ends of the capacitors 11a and 12a are connected to one ends of connection wirings 45 and 46, respectively. One ends of the capacitors 11b and 12b are connected to the other ends of the connection wirings 45 and 46, respectively. The other ends of the capacitors 11b and 12b are connected to one end and the other end of the connection wiring 43, respectively. In the circuit board 19, through holes (not shown) are formed in the arrangement positions of the connection wirings 43 and 44, respectively. Metal posts (not shown) are provided at positions corresponding to the two through holes, respectively. The connection wirings 43 and 44 are electrically connected to the housing 18 by screwing the circuit board 19 to the column at the positions where the connection wirings 43 and 44 are arranged. Accordingly, the other terminals of the capacitors 11b, 12a, 13, and 14 are electrically connected to the housing 18.

  The four power supply wires 21 to 24 and the connection wires 43 to 46 are arranged with a distance satisfying the safety standard corresponding to the application of the power supply device according to the first modification. For example, in a power supply device conforming to IEC 60065, the distance d3 between the AC power supply wiring and the DC power supply wiring is determined to be 7 mm or more, and the distance d4 between the connection wirings 43 to 46 and other wirings is determined to be 3.5 mm or more.

  The power supply device according to the second modification has the same configuration as the power supply device 5 shown in FIG. FIG. 18 is a plan view showing a part of a circuit board according to a second modification. As shown in FIG. 18, in addition to the L wiring 21, the N wiring 22, the P wiring 23, and the G wiring 24, there are three connection wirings 44 and 48 (rectangular pattern) on the back surface of the circuit board 19. A connection wiring 47 (T-shaped pattern) having an end is formed. Also in FIG. 18, the G wiring 24, the connection wiring 44, and the capacitors 13 and 14 are omitted for the same reason as in FIG. 17.

  One ends of the capacitors 11a and 12a are connected to branch portions of the L wiring 21 and the N wiring 22, respectively. The other ends of the capacitors 11a and 12a and one end of the capacitor 11b are connected to the three ends of the connection wiring 47, respectively. In the circuit board 19, through holes (not shown) are formed at the positions where the connection wirings 44 and 48 are arranged. Metal posts (not shown) are provided at positions corresponding to the two through holes, respectively. By screwing the circuit board 19 to the support at the position where the connection wirings 44 and 48 are arranged, the connection wirings 44 and 48 and the other terminals of the capacitors 11 b, 13 and 14 are electrically connected to the housing 18.

  The four power supply wirings 21 to 24 and the connection wirings 44, 47, and 48 are arranged with a distance satisfying the safety standard corresponding to the application of the power supply device according to the second modification. For example, in a power supply device conforming to IEC 60065, the distance d4 between the connection wiring 47 and other wiring is determined to be 3.5 mm or more, and the distance d7 between the connection wiring 48 and the AC power supply wiring is determined to be 7 mm or more.

  The power supply device according to the third modification has the same configuration as the power supply device 1 shown in FIG. FIG. 19 is a cross-sectional view of a power supply device according to a third modification. FIG. 20 is a plan view showing a part of the circuit board 19 according to the third modification. In the third modification, the connection wirings 43 and 44 are electrically connected using the aerial wiring 64. In the circuit board 19, one or more through holes 54a and 54b are formed at the arrangement positions of the connection wirings 43 and 44, respectively. One end of the aerial wiring 64 is connected to the back side conductor (land) of the through hole 54a. The other end of the aerial wiring 64 is connected to the back side conductor portion of the through hole 54b. When connecting the end portion of the aerial wiring to the conductor portion on the back side of the through hole, the covering of the end portion of the aerial wiring is peeled off, and the internal conductor is passed through the through hole for soldering. Generally, in order to allow the secondary wiring to pass through the primary region, the wiring needs to be reinforced and insulated. Therefore, a double insulated wire is used for the aerial wiring 64. The connection wirings 43 and 44 are electrically connected using a double insulated aerial wiring 64, and the other terminals of the capacitors 11 to 14 are electrically connected to the housing 18.

  The four power supply wires 21 to 24 and the connection wires 43 and 44 are arranged with a distance satisfying the safety standard corresponding to the application of the power supply device according to the third modification. For example, in a power supply device conforming to IEC 60065, the distance d1 between two AC power supply wirings is 3 mm or more, the distance d3 between the AC power supply wiring and the DC power supply wiring is 7 mm or more, and between the connection wiring 44 and another wiring. The distance d4 is determined to be 3.5 mm or more.

  In the power supply device according to the third modification, the first and second connection wirings 43 and 44 are electrically connected using a double insulated aerial wiring 64. Thereby, the other terminals of the first to fourth capacitors 11 to 14 can be electrically connected.

  In FIG. 19, the double insulated aerial wiring 64 is mounted on the back surface of the circuit board 19 (the surface opposite to the capacitors 11 to 14), but instead the surface (capacitor 11) of the circuit board 19. You may mount in the surface of the same side as -14. Further, as the double insulated aerial wiring 64, a jumper wire that passes through a brass wire (single brass wire) that is not covered with a resin tube capable of supporting reinforced insulation may be used.

(Fourth embodiment)
The power supply device according to the fourth embodiment of the present invention has the same configuration as the power supply device 1 shown in FIG. The power supply device according to the present embodiment is characterized by the arrangement of the common mode choke coils 15 and 16. FIG. 21 is a plan view showing a part of the circuit board 17 according to the present embodiment. As shown in FIG. 21, in this embodiment, the common mode choke coils 15 and 16 are arranged with the positions of the first to fourth terminals aligned.

  FIG. 22 is a plan view illustrating a part of the circuit board of the power supply device according to the comparative example. When the converter is disposed on the right side of the common mode choke coils 111 and 112, noise is superimposed on the power supply wiring connected to the right side of the common mode choke coils 111 and 112. In FIG. 22, the common mode choke coils 111 and 112 are not arranged with the positions of the first to fourth terminals aligned. For this reason, it is connected to the right side of the common mode choke coil 111 and the Q1 portion of the power supply wiring on which the noise is superimposed, and the power supply wiring connected to the left side of the common mode choke coil 112 and on which the noise is not superimposed. The Q2 part of this is line-coupled. As a result, the noise superimposed on the Q1 portion of the power supply wiring connected to the right side of the common mode choke coil 111 jumps into the Q2 portion of the power supply wiring connected to the left side of the common mode choke coil 112.

  According to the power supply device according to the present embodiment, the common mode choke coils 15 and 16 are arranged with their terminals positioned so that noise jumps between the power supply wires connected to the common mode choke coils 15 and 16. Can be prevented. When the distance between the first and second terminals (the distance between the third and fourth terminals) is the same between the common mode choke coils 15 and 16, the common mode choke coils 15 and 16 are the first ones. -The 4th terminal should just be arranged and arranged. When the distance between the first and second terminals (the distance between the third and fourth terminals) is different between the common mode choke coils 15 and 16, the common mode choke coils 15 and 16 are at least one set. The terminals (first and third terminals, or second and fourth terminals) may be aligned.

  As described above, the power supply device according to the present embodiment includes the first common mode choke coil 15 provided on the first and second power supply wirings (L wiring 21 and N wiring 22), and the third and fourth power supply wirings. A second common mode choke coil 16 provided on the power supply wiring (P wiring 23 and G wiring 24) is provided. The first and second common mode choke coils 15 and 16 are arranged with at least one pair of terminals aligned. Thus, by arranging the two common mode choke coils 15 and 16 so that the positions of the terminals are aligned, it is possible to prevent noise from occurring in the other power supply wiring due to the noise superimposed on the one power supply wiring. Can do.

  The power supply device according to the present embodiment can be configured as a modification shown in FIG. FIG. 23 is a cross-sectional view of a power supply device according to a modification. In this modification, the common mode choke coil 16 is covered with a tape 65 for performing reinforced insulation. The first to fourth terminals of the common mode choke coil 16 are connected to a double insulated aerial wiring 66. One end of the aerial wiring 66 is connected to both ends of a secondary electrolytic capacitor 67 included in the converter 10. The other end of the aerial wiring 66 is connected to the other terminals of the capacitors 13 and 14. In this way, the common mode choke coil 16 is disposed outside or near the common mode choke coil 15 outside the circuit board 19.

  In the power supply device according to this modification, the first common mode choke coil 15 is disposed on the circuit board 17, and the second common mode choke coil 16 is covered with a reinforced insulating tape 65 and double-insulated. It is provided outside the circuit board 19 while being connected to the wiring 66. Thus, by providing one of the two common mode choke coils 15, 16 on the circuit board 19 and the other outside the circuit board 19, the two common mode choke coils 15, 16 do not increase the size of the circuit board 19. The choke coils 15 and 16 can be arranged with the terminal positions aligned. Thereby, similarly to the power supply device according to the fourth embodiment, it is possible to prevent noise from occurring in the other power supply wiring due to the noise superimposed on the one power supply wiring.

(Fifth embodiment)
The power supply device according to the fifth embodiment of the present invention has the same configuration as the power supply device 1 shown in FIG. FIG. 24 is a plan view showing a part of the circuit board 17 according to the present embodiment. As shown in FIG. 24, the common mode choke coils 15 and 16 are not arranged with the positions of the first to fourth terminals aligned. Instead, the common mode choke coil 16 and the portion corresponding to the arrangement position of the common mode choke coil 15 in the P wiring 23 and the G wiring 24 are electrically shielded using a shield member 68. The shield member 68 is connected to a node having a stable potential (for example, the housing 18). Thereby, similarly to the power supply device according to the fourth embodiment, it is possible to prevent noise from occurring in the other power supply wiring due to the noise superimposed on the one power supply wiring.

  Instead of electrically shielding the common mode choke coil 16 and part of the P wiring 23 and the G wiring 24, the common mode choke coil 15 and the common wiring choke among the L wiring 21 and the N wiring 22 are used. The portion corresponding to the arrangement position of the coil 16 may be electrically shielded.

  In the power supply device according to the present embodiment, the portion corresponding to the arrangement position of the second common mode choke coil 16 in the first and second power supply wires (L wire 21 and N wire 22) is the first portion, and the third and third wires. When the part corresponding to the arrangement position of the first common mode choke coil 15 in the four power supply wirings (P wiring 23 and G wiring 24) is the second part, the first common mode choke coil 15 and the first part, and At least one of the second common mode choke coil 16 and the second portion is electrically shielded. In this way, by electrically shielding one common mode choke coil and a part of the two power supply wires connected to the common mode choke coil, noise superimposed on the one power supply wire causes noise in the other power supply wire. Can be prevented.

(Sixth embodiment)
FIG. 25 is a circuit diagram of a power supply device according to the sixth embodiment of the present invention. The power supply device 6 shown in FIG. 25 has a configuration in which the common mode choke coil 16 is deleted from the power supply device 1 (FIG. 1) according to the first embodiment. FIG. 26 is a plan view showing a part of the circuit board 17 according to the present embodiment. The capacitors 11 to 14 are connected to the four power supply wirings 21 to 24 and the connection wiring 31 as in the first embodiment. The common mode choke coil 15 is provided on the L wiring 21 and the N wiring 22 closer to the converter 10 than the capacitors 11 and 12. A common mode choke coil is not provided on the P wiring 23 and the G wiring 24.

  The distance d3 between the AC power supply wiring and the DC power supply wiring is determined so as to satisfy the safety standard. The distance d3 is determined to be 7 mm or more, for example. Therefore, the common mode choke coil 15 and P on the circuit board 17 are set so that the creepage distance between the third and fourth terminals of the common mode choke coil 15 and the P wiring 23 and G wiring 24 is equal to or greater than the determined value. A slit 69 is provided between the wiring 23 and the G wiring 24. The width of the slit 69 is, for example, 1 mm or more. Thereby, the common mode choke coil 15 can be arranged with a sufficient creepage distance from the P wiring 23 and the G wiring 24.

  The power supply device according to the present embodiment includes a common mode choke coil 15 provided on the first and second power supply wirings (L wiring 21 and N wiring 22) and disposed on the circuit board 17. The circuit board 17 has a slit 69 between the third and fourth power supply wirings (P wiring 23 and G wiring 24) and the common mode choke coil 15. Thereby, the common mode choke coil 15 can be arranged with a sufficient creepage distance from the third and fourth power supply wirings without increasing the size of the circuit board 17.

(Seventh embodiment)
FIG. 27 is a circuit diagram of a power supply device according to the seventh embodiment of the present invention. A power supply device 7 shown in FIG. 27 is obtained by replacing the converter 10 with a converter 70 in the power supply device 1 according to the first embodiment. The converter 70 is an insulated DC / DC converter including a switching element, a transformer, an electrolytic capacitor (all not shown), and the like. The converter 70 converts the DC voltage input from the primary side terminals B1 and B2 into DC voltages of different levels, and outputs the converted DC voltage from the secondary side terminals B3 and B4.

  The power supply device 7 converts the voltage input from the input terminals A1 and A2, and outputs the converted voltage from the output terminals A3 and A4. A DC power supply 103 is connected to the input side of the power supply device 7, and a load 102 is connected to the output side of the power supply device 1. The input terminals A1 and A2 are each connected to two terminals of the DC power supply 103, and the output terminals A3 and A4 are respectively connected to two terminals of the load 102. The power supply device 7 converts the AC voltage supplied from the DC power source 103 into a DC voltage of a predetermined level, and applies the converted DC voltage to the load 102.

  Between the power supply device 1 according to the first embodiment and the power supply device 7 according to the present embodiment, the function and circuit configuration of the converter, the performance of the capacitors 11 to 14 and the common mode choke coils 15 and 16, and safety However, the same circuit can be used as a common mode noise countermeasure.

  In the power supply device 7 according to the present embodiment, the converter 70 is a DC / DC converter that converts a DC voltage into a DC voltage of a different level. Therefore, the same effect as the power supply device 1 according to the first embodiment can be achieved with respect to the power supply device 7 that converts the input DC voltage into a DC voltage of a different level and outputs it.

(Eighth embodiment)
FIG. 28 is a circuit diagram of a power supply device according to the eighth embodiment of the present invention. The power supply device 8 shown in FIG. 28 is obtained by connecting the connection points of the capacitors 11 to 14 to the heat sink 81 instead of the casing in the power supply device 4 shown in FIG. The heat sink 81 is a heat radiating member formed of a metal such as aluminum. FIG. 29 is a cross-sectional view of the power supply device 8. Also in the power supply device 8, the capacitors 11 to 14, the four power supply wirings 21 to 24, and the connection wiring 31 are connected as shown in FIG.

  Converter 10 includes one or more power devices 82. The heat sink 81 includes a base portion 83 having an area equal to or larger than that of the circuit board 17 and a protrusion 84 for mounting the power device 82. The base portion 83 and the protruding portion 84 may be integrally formed by cutting one metal material. Alternatively, the base portion 83 and the protruding portion 84 may be formed separately and the protruding portion 84 may be attached to the base portion 83.

  The circuit board 17 has a through hole 62 at the position where the connection wiring 31 is disposed, and is screwed to a metal support 63 having a female screw formed at one end using a screw 61 inserted into the through hole 62. . The other end of the column 63 is fixed to the base portion 83 of the heat sink 81 instead of the housing. The screw 61 is in contact with the connection wiring 31 and the column 63, and the column 63 is in contact with the base portion 83 of the heat sink 81. Therefore, the connection wiring 31 and the other terminals of the capacitors 11 to 14 are electrically connected to the heat sink 81.

  In order to fix the power device 82 to the protrusion 84, the package of the power device 82 has a through hole 85, and a hole 86 having a female screw is formed in the protrusion 84. The power device 82 is screwed to the protrusion 84 using a screw 87 inserted into the through hole 85 and the hole 86. In order to screw the power device 82 to the protrusion 84 after fixing the circuit board 17 above the heat sink 81, the circuit board 17 has a through hole 85 and a hole 86 at a portion larger than the head of the screw 87. A hole 88 is formed. In FIG. 29, screwing is performed to fix the power device 82 to the protrusion 84 of the heat sink 81, but clipping may be performed instead.

  As described above, the power supply device 8 according to this embodiment includes the heat sink 81. The circuit board 17 has a through hole 62 formed at the position where the connection wiring 31 is arranged, and a female screw is formed at one end using a screw 61 inserted into the through hole 62, and the other end is fixed to the heat sink 81. It is screwed to the metal post 63 made. In this way, the other terminals of the first to fourth capacitors 11 to 14 are electrically connected to the heat sink 81 by screwing the circuit board 17 to the column 63 fixed to the heat sink 81 at the position where the connection wiring 31 is arranged. can do. By connecting the connection points of the capacitors 11 and 12 and the connection points of the capacitors 13 and 14 to a heat sink 81 having a large size and a stable potential, fluctuations in potential at the two connection points are effectively suppressed, and the common Mode noise can be effectively suppressed.

  About the power supply device 8 which concerns on this embodiment, the following modifications can be comprised. The power supply device (not shown) according to the first modification is obtained by connecting the connection points of the capacitors 11b, 13, and 14 to the heat sink instead of the housing in the power supply device 5 shown in FIGS. The power supply device according to the first modification includes a heat sink. The circuit board 17 has a through hole formed in an overlapping portion of the first and second connection wirings 35 and 41, and a female screw is formed at one end using a screw 61 inserted into the through hole, and the other end Is screwed to a metal post fixed to the heat sink. In this way, by screwing the circuit board 17 to the support fixed to the heat sink at the overlapping portion of the first and second connection wirings 35 and 41, the other terminals of the first to fourth capacitors 11 to 14 are used as the heat sink. Can be electrically connected. Thereby, the same effect as the power supply device 5 can be produced.

  The power supply device (not shown) according to the second modification is the same as the power supply device according to the third embodiment shown in FIGS. 15 and 16 except that the connection points of the capacitors 11 and 12 and the connection points of the capacitors 13 and 14 are It is connected to the heat sink instead of the housing. The power supply device according to the second modification includes a heat sink. The circuit board 19 has through holes 62a and 62b at the positions where the first and second connection wirings 43 and 44 are arranged, and screws 61a and 61b inserted into the through holes 62a and 62b. The other end is screwed to metal posts 63a and 63b fixed to the heat sink. Thus, the other terminals of the first to fourth capacitors 11 to 14 are connected to the first and second connection wirings 43 and 44 formed on the single-sided substrate, and the arrangement positions of the first and second connection wirings 43 and 44 are arranged. Then, the other terminals of the first to fourth capacitors 11 to 14 can be electrically connected to the heat sink by screwing the circuit board 19 to the columns 63a and 63b fixed to the heat sink. Thereby, there can exist an effect similar to the power supply device which concerns on 3rd Embodiment.

(Ninth embodiment)
FIG. 30 is a circuit diagram of a power supply device according to the ninth embodiment of the present invention. The power supply device 9 shown in FIG. 31 is obtained by adding a heat sink 91 to the power supply device 4 shown in FIG. The heat sink 91 is fixed to the housing 18. Since the connection points of the capacitors 11 to 14 are electrically connected to the housing 18, the potential of the heat sink 91 is equal to the potential of the connection points of the capacitors 11 to 14. FIG. 31 is a cross-sectional view of the power supply device 9. Also in the power supply device 9, the capacitors 11 to 14, the four power supply wirings 21 to 24, and the connection wiring 31 are connected as shown in FIG.

  Similar to the power supply device 4, the circuit board 17 is screwed to the support 63 using screws 61, and the other end of the support 63 is fixed to the housing 18. Accordingly, the connection wiring 31 and the other terminals of the capacitors 11 to 14 are electrically connected to the housing 18. In order to fix the power device 82 to the heat sink 91, the package of the power device 82 has a through hole 85, and the heat sink 91 is formed with a hole 92 having a female screw. The power device 82 is screwed to the heat sink 91 using screws 87 inserted into the through holes 85 and the holes 92.

  The housing 18 to which the heat sink 91 is fixed has a heat sink function. As described above, according to the power supply device 9 in which the connection points of the capacitors 11 to 14 are connected to the casing 18 having the heat sink function, the same effect as that of the power supply device 4 can be obtained. Note that the power supply device 9 according to the present embodiment also includes a modification in which a heat sink is added to the power supply device 5 illustrated in FIGS. 13 and 14, and the power supply device according to the third embodiment illustrated in FIGS. 15 and 16. The modification which added can be comprised.

  It should be noted that various power supply devices can be configured by arbitrarily combining the features of the power supply devices according to the above-described embodiments and modifications thereof as long as they do not contradict their properties. For example, a power supply device other than the power supply device 1 according to the first embodiment may have the characteristics of the power supply devices according to the fourth to ninth embodiments. In addition, the power supply device including the capacitors 11 to 14 functioning as the Y capacitor has been described so far in order to suppress the common mode noise. However, in addition to the capacitors 11 to 14, the capacitor functioning as the X capacitor is provided. A power supply device may be configured. By providing the X capacitor, normal mode noise can be suppressed.

DESCRIPTION OF SYMBOLS 1-9 ... Power supply device 10, 70 ... Converter 11-14 ... Capacitor 15, 16 ... Common mode choke coil 17, 19 ... Circuit board 18 ... Case 21 ... L wiring 22 ... N wiring 23 ... P wiring 24 ... G wiring 31-37, 41-48 ... Connection wiring 51-54 ... Through hole 61, 87 ... Screw 62, 85, 88 ... Through-hole 63 ... Post 64, 66 ... Aerial wiring 65 ... Tape 67 ... Secondary electrolytic capacitor 68 ... Shield member 69 ... Slit 81, 91 ... Heat sink 82 ... Power device 83 ... Base part 84 ... Protrusions 86, 92 ... Hole

Claims (27)

A power supply device that converts a voltage input from the first and second terminals and outputs the converted voltage from the third and fourth terminals,
A converter arranged on the circuit board and converting the voltage;
One terminal includes first to fourth capacitors respectively connected to first to fourth power supply wirings connecting the first to fourth terminals and the converter,
The first to fourth capacitors are arranged close to the circuit board,
The other terminal of said 1st-4th capacitor | condenser is electrically connected, The power supply device characterized by the above-mentioned. The circuit board is a double-sided board capable of forming wiring on both sides,
The power supply device according to claim 1, wherein the other terminals of the first to fourth capacitors are connected to a connection wiring formed on the circuit board.   The power supply device according to claim 2, wherein the connection wiring is formed only on one surface of the circuit board.   The circuit board is housed in a metal housing, has a through hole formed at the position of the connection wiring, and a screw inserted into the through hole is formed with a female screw at one end. The power supply device according to claim 3, wherein the other end is screwed to a metal column fixed to the casing. A heat sink,
The circuit board has a through hole formed at an arrangement position of the connection wiring, a female screw is formed at one end using a screw inserted into the through hole, and the other end is fixed to the heat sink. The power supply device according to claim 3, wherein the power supply device is screwed to a metal column.   4. The power supply device according to claim 2, wherein the other terminals of the first to fourth capacitors are connected in common to one connection wiring formed on the circuit board. 5.   The connection wiring is formed so as to have an overlapping portion between the first connection wiring formed on one surface of the circuit board and the first connection wiring on the other surface of the circuit board. The power supply device according to claim 2, further comprising a connection wiring.   The power supply apparatus according to claim 7, wherein the first and second connection wirings are electrically connected using a through hole formed in the overlapping portion.   The circuit board is housed in a metal housing and has a through hole formed in the overlapping portion. A screw inserted into the through hole is used to form a female screw at one end and the other end at the other end. The power supply device according to claim 7, wherein the power supply device is screwed to a metal support fixed to the housing. A heat sink,
The circuit board has a through hole formed in the overlapping portion, and a screw inserted into the through hole is formed with a female screw at one end and the other end fixed to the heat sink. The power supply device according to claim 7, wherein the power supply device is screwed to the support column. The circuit board is a single-sided board capable of forming wiring on one side,
The other terminals of the first and second capacitors are connected to a first connection wiring formed on the circuit board,
2. The power supply device according to claim 1, wherein the other terminals of the third and fourth capacitors are connected to a second connection wiring formed on the circuit board.   The circuit board is housed in a metal housing, has a through hole at each of the first and second connection wiring positions, and has a female screw at one end using a screw inserted into the through hole. The power supply device according to claim 11, wherein the power supply device is formed and screwed to a metal column fixed to the housing at the other end. A heat sink,
The circuit board has through holes at the arrangement positions of the first and second connection wirings, and a female screw is formed at one end using a screw inserted into the through hole, and the other end is formed on the heat sink. The power supply device according to claim 11, wherein the power supply device is screwed to a fixed metal post.   12. The power supply device according to claim 11, wherein the first and second connection wirings are electrically connected using a double insulated air wiring. In the circuit board, one or more connection wirings are formed to connect the other terminals of the first to fourth capacitors,
2. The power supply device according to claim 1, wherein the first to fourth power supply wirings and the connection wiring are arranged on the circuit board with a distance satisfying a safety standard.   16. The power supply device according to claim 15, wherein each of the first and second capacitors is composed of a single capacitor.   16. The power supply device according to claim 15, wherein each of the first and second capacitors is composed of two capacitors connected in series. The first capacitor includes two capacitors connected in series, including a common capacitor,
The power supply device according to claim 15, wherein the second capacitor includes two capacitors connected in series including the common capacitor. A first common mode choke coil provided on the first and second power supply wirings;
A second common mode choke coil provided on the third and fourth power supply wirings,
2. The power supply device according to claim 1, wherein the first and second common mode choke coils are arranged such that positions of at least one pair of terminals are aligned. The first common mode choke coil is disposed on the circuit board;
The second common mode choke coil is provided outside the circuit board in a state of being covered with a reinforced insulating tape and connected to a double insulated air wiring. The power supply device described in 1. A first common mode choke coil provided on the first and second power supply wirings;
A second common mode choke coil provided on the third and fourth power supply wirings,
A portion of the first and second power supply wirings corresponding to the arrangement position of the second common mode choke coil is a first portion, and a part of the third and fourth power supply wirings is an arrangement position of the first common mode choke coil. When the corresponding portion is the second portion, at least one of the first common mode choke coil and the first portion and the second common mode choke coil and the second portion is electrically shielded. The power supply device according to claim 1, wherein: A common mode choke coil provided on the first and second power supply lines and disposed on the circuit board;
2. The power supply device according to claim 1, wherein the circuit board has a slit between the third and fourth power supply wirings and the common mode choke coil. 3. The circuit board is housed in a metal casing,
The power supply apparatus according to claim 1, wherein the other terminals of the first to fourth capacitors are electrically connected to the casing. A heat sink,
The power supply device according to claim 1, wherein the other terminals of the first to fourth capacitors are electrically connected to the heat sink.   25. The power supply device according to claim 1, wherein the first to fourth capacitors are arranged on the same side of the converter at a planar position on the circuit board.   The power supply device according to claim 1, wherein the converter converts an AC voltage into a DC voltage.   The power supply device according to claim 1, wherein the converter converts a DC voltage into a DC voltage of a different level.

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