JPH0513895A - Insulated inverter - Google Patents

Abstract

PURPOSE:To provide an insulated inverter having excellent mounting operability and an inexpensive wide conductive member to prevent a radio wave failure. CONSTITUTION:In an insulated inverter in which a conductive member 10 for connecting a primary side to a secondary side of a transformer T is provided on a circuit board 130, the member 10 is wide and erected on the board 130 at the edge of the board 130.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device using an insulation type inverter circuit, and more particularly to a structure of an insulation type inverter circuit board provided with measures against radio interference.

[0002]

2. Description of the Related Art As shown in FIG. 5, an insulation type inverter circuit rectifies an AC power source and controls switching elements connected in series to a primary coil of a switching transformer at high speed to perform on / off switching control. An AC output is induced in the secondary coil, and the secondary AC output is rectified and smoothed to obtain a required secondary output for charging the storage battery, for example.

In this type of insulated inverter device, there has been a problem that noise is generated due to the influence of the inductance component and the capacitance component existing in the circuit or the charge accumulated in the secondary side rectifying element due to the high speed switching. Among these, especially on the secondary side where the output is taken out, the arrangement position of the secondary side rectifying element is restricted in relation to the heat sink, and the output end of the secondary side is also restricted by the design etc. Therefore, the pattern from the rectifying element to the output end tends to be long. For this reason, the high-frequency impedance becomes high, and the high-frequency component generated in the rectifying element is radiated as noise from the pattern, so that the lines on the secondary side are considerably fluctuated, and the secondary side is unstable. The condition caused noise. Therefore, conventionally, in order to stabilize such an unstable state, the secondary side line is connected to the primary side via a capacitor.

FIG. 6 shows the structure of a printed circuit board for connecting the secondary side and the primary side. FIG. 6 (a) is a perspective view and FIG. 6 (b) is a state in which elements 61 and 62 are omitted. FIG. In the figure, 60 is a printed circuit board on which an insulation type inverter circuit is mounted, 61 is a switching element having a heat radiating plate 61a, and 62 is a rectifying element on the secondary side having a heat radiating plate 62a. In addition, the circuit portion forming the primary side and the circuit portion forming the secondary side of the inverter are the printed circuit board 60.
Above, they are arranged separately on the left and right sides. In addition,
In the figure, other electric elements constituting the inverter circuit are omitted.

Then, due to restrictions on the housing shape and the like,
Printed circuit board 60 is L-shaped to increase the heat dissipation area
Insulating paper 63 is laid on the lower surface of the heat radiating plate extending to the lower surface, and a conductive member 64 made of a copper plate having both ends bent to connect the primary side and the secondary side is provided on the back surface thereof. It was attached by work. As the conductive member 64,
Wide ones are used to lower the high frequency impedance.

[0006]

In the above-mentioned conventional insulated type inverter device, since the conductive member having a complicated shape for connecting the primary side and the secondary side is manually attached to the lower surface side of the substrate, the work is performed. However, there is a problem in that the manufacturing cost is high.

The present invention has been made in view of the above,
It is an object of the present invention to provide an insulated inverter device having a wide conductive member that is easy to install and is low in cost.

[0008]

The present invention is a transformer 1
In an insulated inverter device in which a conductive member connecting a secondary side and a secondary side is provided on a circuit board, the conductive member is wide, and is upright with respect to the circuit board at a side edge portion of the circuit board. (Claim 1)

Further, the conductive member may be formed such that a side edge portion of the circuit board is bendable, and a wide conductive pattern is formed on a surface of the side edge portion (claim 2).

[0010]

According to the present invention, the insulating member can be attached to the side edge portion of the inverter circuit board with good workability, and the cost can be reduced. Further, since it is provided upright with respect to the circuit board, the empty space above the circuit board is effectively utilized.

According to the second aspect of the present invention, it becomes easy to form the conductive pattern on the surface of the side edge portion of the circuit board in advance, and the side edge portion is formed to be bendable in advance. It is easy to make the circuit board stand upright.

[0012]

FIG. 5 is a circuit diagram showing an example of an insulation type inverter device according to the present invention. In the figure, 1 is an AC power source such as a commercial power source, 2 is a diode bridge for rectification, 3
Is a capacitor for smoothing the rectified current.
T is a switching transformer, and a switching element 4 is connected in series to the primary coil. In addition, 5 is a filter section including capacitors C5 and C6 on both sides and a line filter L1, and 6 is a snubber circuit for removing noise including a diode D3, a resistor R1 and a capacitor C7.

The secondary coil of the transformer T is connected to diodes D1 and D2 for rectifying the induced AC secondary output, a choke coil L2 for smoothing, and a capacitor C8, and a required level of 2 rectified and smoothed by such a circuit. The following output is generated. This secondary output is used, for example, for the purpose of charging a storage battery or supplying power to a motor load. Reference numeral 7 is an FET drive circuit for sending a switching pulse of a constant cycle to the switching element 4 to control the on / off switching of the transformer T at high speed to control the secondary side output.

Numeral 8 is a primary line bypass capacitor consisting of a series circuit of capacitors C1 and C2 interposed in parallel with the filter section 5, and numeral 9 is a series circuit of capacitors C3 and C4 interposed in parallel with the secondary side output. It is a secondary line bypass capacitor.

10 is a primary line bypass capacitor, 2
This line connects the middle points of the next line bypass capacitors. This line 10 electrically connects the primary side and the secondary side to stabilize the unstable state of the secondary side,
It is intended to prevent the generation of noise radiation. Further, the line 10 is preferably made of a wide conductive material so as to reduce the high frequency impedance. The configuration of the capacitors C1 to C4 may be changed to a configuration in which the primary coil and the secondary coil of the transformer T are connected by a line 10 via a capacitor.

FIGS. 3 and 4 show the structure of a printed circuit board on which an insulation type inverter circuit is mounted. In FIG. 3, reference numeral 30 denotes a printed circuit board on which a required circuit pattern is printed, and one end portion of the printed circuit board is provided with pilot holes 31, 31 for carrying the circuit board in a predetermined number in the longitudinal direction. Further, groove-shaped V cuts 32, 32 are formed in parallel in the longitudinal direction on both side edge portions inside the pilot hole 31. The printed circuit board 30 has a wiring pattern or the like printed on an inner portion of the V cut 32 (hereinafter referred to as a circuit board portion 130), and this portion is used as an inverter circuit board.

By the way, in the manufacturing process of circuit boards in recent years, automatic mounting techniques such as surface mounting of chip components have progressed, and many chip components are also automatically mounted in inverter devices. Further, the soldering of the automatically mounted chip components to the printed circuit board is also carried out by automatically transporting the circuit board onto the solder bath. In such automatic mounting and automatic soldering process work, an engaging member (not shown) of the carrier engages with the pilot hole 31 to hold the printed circuit board, and the printed circuit board on which the chip parts are surface-mounted is accurately placed at a predetermined position. I am going to carry it. V cut 3 above
Areas outside 2, 32 (hereinafter referred to as space portions 131) are areas where the carrier holds the printed circuit board, and normally, this area is folded and discarded after the completion of the product.

Reference numeral 33 denotes a side edge side where the pilot hole 31 is not formed, and the circuit board portion 13 sandwiching the V cut 32.
0 is a jumper wire soldered to a pinhole to connect the space portion 131 with the space portion 131. The jumper wire 33 is electrically conductive, and can be made of, for example, annealed copper wire of about 0.6φ, which has flexibility and strength necessary for vertically supporting the space portion 131 as described later.

Further, as shown in FIG.
A conductive pattern such as a copper foil is formed in the longitudinal direction of the back surface of the space portion 131 joined together at the same time as the formation of the wiring pattern or at an appropriate time thereafter. The conductive pattern 10 corresponds to the line 10 in FIG. 5, and has a required wide width to reduce the high frequency impedance on the secondary side as described above. In this way, the originally discarded space portion 131 can be effectively utilized, and since the conductive pattern can be formed at the same time as the wiring pattern of the circuit board portion 130, it is not necessary to prepare a separate component.

After the soldering is completed, the space portion 131 is bent and separated from the circuit board portion 130, and is bent in the direction of the arrow by bending the jumper wire 33 to support the circuit board portion 130 upright. To be done. In this way, since it is only necessary to bend the space portion 131 and erect it, the working process is extremely simplified. Moreover, in contrast to the conventional work in which the circuit board is reversed and the conductive member is attached to the back surface after the components are mounted, in this embodiment, the work can be performed while facing upward, and since there is an empty space above, workability is also good, In addition, effective use of space can be achieved, leading to lower costs.

1 and 2 show an example of the structure of an inverter board of an insulation type inverter device according to the present invention.
1 is a perspective view and FIG. 2 is a plan view. For convenience of explanation, the transformer T and other parts are omitted.

As shown in the drawing, on the depth side of the circuit board portion 130, the switching element 4 having the heat radiating plate 11a and the secondary side rectifying diodes D1 and D having the heat radiating plate 11b are provided.
The element in which 2 is integrally formed is arranged, and the primary side line bypass condenser 8 and the line filter L1 constituting the filter section 5 are provided in the secondary side in the circuit section which constitutes the opposing primary side. In the circuit portion that constitutes the secondary side bypass capacitor 9 and the secondary side output terminals P (+), P
(-) And the like are arranged respectively. Then, the midpoints of the line bypass capacitors 8 and 9 are connected to the corresponding jumper wires 33 by a wiring pattern formed in advance, and the jumper wires 33 are connected to the conductive pattern 10. The secondary filter unit 5 and the secondary output unit can be connected at the shortest distance via a capacitor.

Reference numeral 12 is an AC cord of the AC power supply 1 and is connected to the filter section 5. The secondary side output terminals P (+) and P (-) are structured so that the connection terminals of the load (not shown) can be easily fitted therein.

Further, particularly in a high output inverter circuit,
Since the loss in the switching element 4 and the rectifying elements D1 and D2 is large, in order to suppress the temperature rise, as in FIG.
The heat radiating plates 11a and 11b are formed in an L shape and extend to the back surface of the circuit board portion 130 to increase the heat radiating area. In this embodiment, the insulation distance defined by the Electrical Appliance and Material Control Law between the heat sinks 11a and 11b and the conductive pattern 10 is such that the wide conductive pattern 10 is provided on one side of the circuit board portion 130 and the heat sinks 11a and 11b are provided. It is secured by being attached to the other side, and it is not necessary to purposely intervene the insulating paper 63 to insulate as in the conventional case, whereby the workability is improved and the manufacturing cost can be suppressed.

[0025]

As described above, according to the present invention,
Since the conductive member is wide and upright with respect to the circuit board at the side edge portion of the circuit board, an empty space above the board can be used, workability is good, and effective use of space is possible. In addition, the cost can be reduced.

Further, since the side edge portion of the circuit board is formed to be bendable and the conductive member has a wide conductive pattern formed on the surface of the side edge portion, the side edge portion originally discarded can be effectively used. Moreover, since the conductive member in this portion can be formed at the same time as the wiring pattern on the substrate, it is not necessary to prepare a separate component. Further, since it is sufficient to bend the side edge portion and erect it, the working process is extremely simplified.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a configuration of an inverter board of an insulated inverter device according to the present invention.

FIG. 2 is a plan view showing an example of a configuration of an inverter board of an insulation type inverter device according to the present invention.

FIG. 3 shows a structure of a printed circuit board on which an insulation type inverter circuit is mounted.

FIG. 4 shows a structure of a printed circuit board on which an insulation type inverter circuit is mounted.

FIG. 5 is a circuit configuration diagram showing an example of an insulated inverter device according to the present invention.

6A and 6B show a structure of a conventional printed circuit board for connecting a secondary side and a primary side, wherein FIG. 6A is a perspective view and FIG.
Is a front view.

[Explanation of symbols]

5 Filter section 8 Primary line bypass capacitor 9 Secondary line bypass capacitor 10 lines (conductive pattern) C1 to C4 capacitors 30 printed circuit boards 31 Pilot hole 32 V cut 33 jumper wire 130 Circuit board part 131 Space Department

Claims (2)

[Claims] 1. An insulated inverter device in which a conductive member connecting a primary side and a secondary side of a transformer is provided on a circuit board, wherein the conductive member is wide and is provided on a side edge portion of the circuit board. An insulated inverter device characterized by being upright with respect to a circuit board. 2. The conductive member is formed such that a side edge portion of the circuit board is bendable, and a wide conductive pattern is formed on a surface of the side edge portion. 1. The insulated inverter device according to 1.