JPS611093A - Power source - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a power supply device that can obtain a predetermined voltage by inputting a certain power supply voltage.

Conventional configurations and their problems In products with built-in control circuits equipped with electronic components, a transformer is used to generate low-voltage power from the commercial power supply voltage, which is input to the control circuit to control the product.

FIG. 1 is a circuit diagram of a microwave oven. magnetron 4
A voltage is applied to the device, which oscillates and heats the food. MF is a fan motor that cools the magnetron. Still, L is an oven lamp, which allows the inside of the oven to be seen.

The magnetron, fan motor, and oven lamp are all controlled by the control circuit 5. A low voltage transformer 6 supplies power to this control circuit 5.
It is. Figure 2 shows a schematic diagram of the low voltage transformer. Commercial power supply voltage is applied to the connector 11 and input to the primary side of the transformer via the lead sensor 13, and the voltage generated on the secondary side is output to the connector 12 via the lead sensor 14 and connected to the connector 15 of the control circuit. As a result, a voltage is input to the control circuit. This transformer beam - Dosen 1
3.14 are all soldered to the internal windings of the transformer, making the cost extremely high. Also,
One end of the lead sensor is connected to a connector, and the connector pins must be caulked, which not only increases costs but also causes major quality problems such as incomplete caulking.

In addition, as a noise countermeasure for the control circuit, noise absorbing elements such as varistors and resurgers are included in the power supply circuit.
In order to connect it to a commercial power supply line, it becomes a part of the lead sensor harness as shown in FIG. 3, and requires a force/input point 15 and an enclosure point 16, resulting in a large cost amplifier.

On the other hand, FIG. 4 shows the structure of a low voltage transformer 16 that is mounted directly on the P plate and is different from the lead-centered low voltage transformer.

The low voltage transformer 160 is directly mounted on the printed circuit board 18 on which the control circuit 5 is formed.

The transformer is mounted by using metal fittings 17 and fixing the printed circuit board and the low voltage transformer by tightening screws.

Although the 1 type transformer 16 directly attached to the P board has a lower cost than the lead-centered transformer, there is a risk that the printed circuit board 18 may be cracked or the pattern may be broken due to dropping or vibration. Furthermore, since the commercial power supply line is located on the printed circuit board, the control circuit may malfunction due to noise or the like. However, the maximum transformer capacity is approximately 1oVA, which has the disadvantage that it cannot be used in a circuit having a humidity sensor.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional problems, and aims at realizing a power supply device that is highly resistant to drops and vibrations and has high noise resistance, as well as achieving a significant cost reduction.

Structure of the Invention In order to achieve the above object, the power supply device of the present invention connects the input/output terminals to a transformer having a pin shape in a direction perpendicular to the fixing hole, which has a fixing hole for screw tightening, etc., and connects the commercial power supply voltage. The input connector and output voltage lead sensor are connected to a printed circuit board equipped with noise absorbing elements such as varistors and resurgers, and the transformer is held in the fixing hole to hold the printed circuit board, making it resistant to drops and vibrations. It has the following effects: high strength, high noise resistance, and low cost.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 5 is a schematic diagram of the power supply device of the present invention, and FIG. 6 is a circuit diagram of the present invention. The transformer 19 has a fixing hole 20 for screw tightening or the like. Further, pins 21 for input/output terminals are provided in a direction perpendicular to the fixing hole 2o. This transformer can be automated, resulting in significant cost reductions. 22 is a printed circuit board connected to this transformer, and the pin 21 of the transformer is inserted into the hole 2γ of the printed circuit board 22 and connected by soldering.

23 is a connector into which the commercial power supply voltage is input;
is a lead sensor that outputs a predetermined transformer secondary output voltage, and a connector 26 attached to one end of the lead sensor inputs the output voltage to the control circuit printed circuit board 18 forming the control circuit 5. A varistor 7, a serger 8, a discharge resistor 9, and an earth lead sensor 26 are mounted on the cut-off printed circuit board 22 between the commercial power lines. On the printed circuit board 22, sufficient pattern spacing is also provided between the commercial power line (i.e., the primary side of the transformer) and the secondary side of the transformer.
It became possible to increase the width of the rounded pattern. Further, when the transformer is fixed so that the lower end surface of the printed circuit board 22 is 1 to 2 mm above the position of the fixing hole of the transformer, the P board is surely configured to float above the bottom surface of the transformer. By fixing the chassis ground lead sensor 26 to the transformer, it has become extremely resistant to drops and vibrations. In addition, we were able to reduce costs by using a streamlined pin-type transformer. Furthermore, the control circuit 6
It is completely separated from the printed circuit board 18 forming the circuit board, and the noise absorbing element can be mounted on the printed circuit board, resulting in a significant cost reduction and improved noise resistance.

Effect of the invention As described above, according to the present invention, the following effects are obtained.

(1) A printed circuit board is attached to the transformer, and the transformer is securely fixed with screws, making it extremely resistant to drops and vibrations.

(2) The use of a streamlined transformer and the ability to mount the noise-absorbing element, which had previously been placed inside the No-Nes, on the printed circuit board has made it possible to significantly reduce costs.

(3) Noise resistance is improved by completely separating the control circuit 5 and the power supply device.

(4) Like a lead-centered transformer (there are no more pin caulking, mistakes, or wiring, and the quality has improved dramatically.

(5) Transformer, noise absorption element, ′:! By mounting fi, kuku, lead sensor on the printed circuit board,
Solder dip became possible, allowing for a significant reduction in man-hours and mass production.

(6) Multiple types of transformer primary voltage (i.e. commercial power supply voltage) are now possible, increasing versatility.

[Brief explanation of drawings]

Figure 1 is a conventional circuit diagram, Figure 2 is an external perspective view of a conventional transformer, Figure 3 is a schematic diagram of a conventional noise absorbing element, and Figure 4 is a schematic diagram of a conventional noise absorbing element.
The figure is an exploded perspective view of a conventional printed circuit board with a type 1 transformer mounted directly on a P board, FIG. 5 is an exploded perspective view of the same power supply device, and FIG. 6 is a circuit diagram incorporating the same power supply device. 6... Control circuit, 6... Conventional transformer,
7...Barista, 8-...Resurger, 9.
・Discharge resistor, 16...1 type transformer directly attached to P board, 17...Bracket for mounting transformer, 18...
Printed circuit board forming a control circuit, 19...Transformer used in the present invention, 22... Printed board of the present invention. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 4 Figure 5

Claims (2)

[Claims] (1) A transformer with fixing holes for screw tightening etc. and input/output terminals configured in the form of pins, a printed circuit board, a first connector terminal arranged on the printed circuit board, and a A lead sensor configured as a second connector terminal is provided at the disposed tip, the pins of the transformer and the printed circuit board are connected, and the first connector is connected to a commercial
A power supply device configured to obtain a predetermined voltage at a second connector when a next power supply voltage is applied, and configured to hold the printed circuit board by the transformer. (2) The power supply device according to claim 1, wherein a noise absorbing element such as a varistor and a resurger is mounted on a printed circuit board.