JP2586304Y2 - Power supply unit - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the structure of a switching power supply unit.

[0002]

2. Description of the Related Art A power supply unit which receives a commercial input, drives a switching power supply with a smoothed DC input, and extracts a DC output or an AC output employs various structures as a measure for preventing generation of noise. In particular, it is important to provide an AC input filter as a measure to prevent the noise generated by the switching circuit from propagating to the commercial input side.

However, conventionally, when the entire switching power supply circuit including this AC input filter is housed in one power supply unit housing, a relay terminal is provided on the surface of the power supply unit housing, and a commercial input is applied to the relay terminal. And connected from the terminal to components of an AC input filter distributed in the housing. However, especially in the case of a large-capacity switching power supply, the input current is large, and when the commercial input and the AC input filter are connected via a terminal, the connection impedance becomes large, or the connection is distributed in the housing from the relay terminal. In addition, there is a disadvantage that the wiring to the AC input filter component becomes longer, the filtering effect is reduced, and switching noise is propagated to the commercial input side.

[0004]

In order to keep the switching noise propagating to the commercial input side as low as possible, the wiring impedance between the commercial input and the AC input filter must be as low as possible. For this purpose, it is necessary to reduce the number of relay terminals as much as possible, shorten the wiring as much as possible, and in the case of a large current, distribute the current and minimize the voltage drop at the connection points of the terminals etc. It is.

According to this invention, the whole portion of the AC input filter is mounted on a board, distributed wiring is provided to the collective terminals provided on the board, and the collective terminals of the board are exposed on the surface of the power supply unit housing. An object of the present invention is to propose a power supply unit configured to be directly inserted and connected to a connector distributed and wired on an input side, and to reduce noise propagating to a commercial input side.

[0006]

In response to this object, a power supply unit according to the present invention is provided with a power supply circuit which receives commercial input, converts smoothed rectified DC to AC or DC through a switching circuit, and extracts an output. In a power supply unit housed in one unit, a component comprising an AC input filter circuit is mounted on at least one substrate, and an input portion of the AC input filter circuit on the substrate is provided on the substrate. The terminals are distributed and wired so that the collective terminal can be connected to the commercial input connector by direct contact.

[0007]

The whole portion of the AC input filter is mounted on a substrate, and distributed wiring is provided to a collective terminal provided on the substrate, and the collective terminal of the substrate is exposed on the surface of the power supply unit housing, and is connected to the commercial input side. It is configured so as to be directly inserted and connected to the distributed wiring connector to reduce noise propagating to the commercial input side.

[0008]

FIG. 1 is a circuit diagram of a switching power supply according to the present invention using commercial input power. FIG. 2 is a circuit board mounted with the AC input filter component of the present invention. FIG. 3 is a top view showing the internal structure of the power supply unit housing of the present invention. FIG. 4 is a front view of the power supply unit housing of the present invention.

The switching power supply circuit of the present invention shown in FIG. 1 receives three-phase commercial inputs U ₀ , V ₀ , and W ₀ ,
Input rectifier circuit REC through AC input filter FIL _1
It is converted to direct current by ₁ and converted to a smooth direct current by a DC filter DC / FIL.

The smoothed DC input is converted to AC by a switching circuit, for example, an inverter circuit INV, converted to a desired AC voltage by a transformer T, and output rectifier circuit REC.
The ₂ DC conversion, and sends the DC output stabilized by a connector CN ₂ or CN ₃ through the output filter FIL _2. At this time, the AC input filter FIL ₁ as switching noise does not propagate to the three-phase commercial input generated by the switching operation of the inverter circuit INV is provided on the input side.

The AC input filter FIL ₁ has, for example, inductances L ₁ , L ₂ and capacitors C _1u , C _1V , C _1w ,
Inverse L2 consisting of C _2u , C _2v , C _2w , C _3u , C _3v , C _3w, etc.
It consists of a stage filter.

The components constituting the AC input filter FIL ₁ are mounted on an AC input filter substrate 1 and wired as shown in FIG. The AC input to the set terminal CN ₁ of the AC input filter substrate 1 filter circuit FIL
₁ input side is distributed wiring. The output side of the AC input filter FIL ₁ is connected to the input rectifier circuit REC ₁ through a terminal _{U 1, V 1, W 1} .

All components of the switching power supply circuit are arranged as shown in the top view of FIG. 3 showing the internal structure of the housing of the power supply unit. In particular, the AC input filter board 1 equipped with the AC input filter FIL ₁ shown in FIG.
Is attached to the housing 3.

Collective terminal CN ₁ of AC input filter substrate ₁
Are exposed on the front panel 4 of the power supply unit. Further, the AC input filter board 1 is covered with a shield box 5 together with the components of the AC input filter FIL ₁ to prevent propagation of antenna noise to the outside.

Input rectifier circuit REC ₁ , DC filter DC
The components of the FIL, the inverter circuit INV, the transformer T, the output rectifier circuit REC ₂ , and the output filter FIL ₂ are shown in FIG.
It is arranged in each part inside the housing as shown in FIG.

The output of the power supply circuit is taken out by the connector CN ₂ provided on the front panel 4 or by the connector CN ₃ when the output is divided into two systems. If an AC output is desired, the output rectifier circuit REC _{2 in} the circuit of FIG.
And it removes the output filter FIL _2, may be connected to the output connector CN ₂ or CN ₃ from the output of the transformer T.
Surface view showing an appearance of a configured power units in this manner will be as in Figure 4, the set terminal CN ₁ of the AC input filter substrate 1 commercial input side connector, an output connector CN
_2. Connect to CN ₃ .

[0017]

[Effects of the Invention] As described above, the AC input filter is mounted on one board as in the present invention, and the commercial input side connector distributed and wired to the collective terminal of the AC input filter board is connected. , The number of relay terminals is reduced,
Since the number of wirings is reduced, and the commercial input is connected by a distributed wiring connector, particularly in the case of a large-capacity switching power supply, propagation noise to the commercial input can be reduced.
Further, the circuit wiring is simplified, the number of steps in manufacturing is reduced, and a more useful power supply unit can be provided together with low noise in use.

[Brief description of the drawings]

FIG. 1 is a switching power supply circuit of the present invention using commercial power input.

FIG. 2 is a board diagram on which the AC input filter component of the present invention is mounted.

FIG. 3 is a top view showing the internal structure of the power supply unit housing of the present invention.

FIG. 4 is a front view of the power supply unit housing of the present invention.

[Explanation of symbols]

CN ₁ Collective terminal of substrate CN ₂ , CN ₃ Output connector FIL ₁ AC input filter REC ₁ Input rectifier circuit DC / FIL DC filter INV Switching circuit such as inverter circuit T transformer REC ₂ output rectifier circuit FIL ₂ output filter L ₁ , L ₂ AC input filter inductances C _1u , C _1v , C _1w , C _2u , C _2v , C _2w , C _3u , C _3v , C
_3w AC input filter inductance 1 AC input filter board 2 Mounting stat 3 Housing 4 Front panel 5 Shield box

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Suzuki ▲ Sho ▼ Nippon Telegraph and Telephone Corporation, 1-6-1, Uchisaiwaicho, Chiyoda-ku, Tokyo (56) References JP-A-3-145925 (JP, A) ( 58) Fields surveyed (Int.Cl. ⁶ , DB name) H02J 1/02 H02J 3/01 H02M 1/12

Claims (1)

(57) [Scope of request for utility model registration] An AC input filter circuit is configured in a power supply unit that receives a commercial input, converts a smoothed rectified DC into an AC or a DC through a switching circuit, and stores a power supply circuit for extracting an output in one unit. Components are mounted on at least one substrate, and the input portion of the AC input filter circuit on the substrate is distributed and wired to a collective terminal provided on the substrate, and the collective terminal directly contacts the commercial input connector. Power supply unit that can be connected by