KR20020007008A - Heater coil of high voltage transformer - Google Patents

Abstract

PURPOSE: A heater coil of a high voltage transformer is provided to leave only wiring of a square track shape without a connected portion on a substrate by performing a pattern printing and an etching process on a copper foil surface of a PCB. CONSTITUTION: A wiring(102) having a square track shape is continuously formed on a substrate(101) at predetermined intervals. The wiring has no connected portion and forms a band shape. The wiring(102) is started at a place adjacent to a side edge of a central hole(103), wound three or four times along the central hole(103), and terminated at the circumference of the substrate(101). A printed circuit board that is pattern printed in this way undergoes an etching process, whereby only the wiring is left on the substrate(101). The wiring maintains a predetermined interval from an inside end where it is adjacent to the central hole and is started to an outside end(108) where it is terminated, and wound three or four times by forming almost similar shape as the central hole(103).

Description

Heater coil of high voltage transformer {HEATER COIL OF HIGH VOLTAGE TRANSFORMER}

The present invention relates to a heater coil of a high-voltage transformer, in particular, to form a rectangular ring-shaped printed circuit board having a square hole in the center, and to apply a pattern printing and etching process to the copper foil surface of the printed circuit board on the substrate The present invention relates to a heater coil of a high voltage transformer in which only a plurality of rectangular track-shaped wires without a connecting portion are left at predetermined intervals.

In general, a microwave oven (Micro-Wave Oven) is composed of a heating chamber for cooking food in the interior of the cabinet, and a driving chamber for supplying high frequency and heater heat to the interior of the heating chamber. As shown in FIG. 1, a magnetron 20 and a high voltage transformer 10 generating high frequency are installed in the driving chamber, and a cooling fan 11 is installed to cool them or blow air into the heating chamber. The high voltage transformer 10 supplies power to the heater and the magnetron 20, and has a structure as shown in FIG.

In the high voltage transformer 10, the primary coil 14 and the secondary coil 17 are wound in a rectangular ring shape, respectively, and the primary coil 14 has a single winding structure and a secondary coil. 17 is provided with the heater coil 16, and consists of the lottery structure of the anode voltage and heater voltage which are required for the magnetron 20. As shown in FIG. In addition, the primary side coil 14 and the secondary side coil 17 are mounted on a core in which a silicon (Si) steel sheet is laminated in several layers. The core has an E core 13 located at an upper portion thereof, and an I core. 12 is located at the bottom, and the I core 12 is mounted to the bracket 11. 15 shows a pass core that maintains a constant distance between the primary side coil 14 and the secondary side coil 17.

The conventional heater coil 16 is formed by winding 3-4 times as shown in FIG. 3 by a winding process in a state in which Teflon (polyterafluoroetylene) is coated, and the Teflon is expensively distributed and formed by the winding process. There was a problem that the overall production cost of the high-voltage transformer will rise.

As shown in FIG. 4, the heater coil 16 has one end configured as a terminal b, and the other end constitutes a terminal a and a terminal a '.

The present invention has been made in view of the above circumstances, and an object thereof is to form a rectangular ring-shaped printed circuit board having a square hole at the center thereof, and to apply a pattern printing and etching process to the copper foil surface of the printed circuit board. It is to provide a heater coil of a high-voltage transformer in which only a plurality of rectangular track-shaped wirings having no connecting portion on the surface remain at a predetermined interval.

The present invention is a high-voltage transformer is provided with a secondary coil of a lottery structure having a heater coil in the core, and a primary coil of a single winding structure in order to achieve the above object, the square track shape so that the central hole is provided The heater coil is formed using a printed circuit board formed by forming a heater coil, and only a rectangular track-shaped wiring without a connecting portion is formed continuously at predetermined intervals by forming a strip shape on the substrate by applying pattern printing and etching to the copper foil surface of the printed circuit board. It is to provide a heater coil of a high voltage transformer.

1 is a structural diagram of a driving chamber of a general microwave oven,

2 is a cross-sectional view taken along the line “A-A” of FIG. 1;

3 is a perspective view of a conventional heater coil,

4 is a circuit diagram showing an example of using a conventional heater coil;

5a is a perspective view of a heater coil according to the present invention;

5B is a cross-sectional view of FIG. 5A,

Figure 6a is a plan view showing an embodiment of a heater coil according to the present invention,

6B is a perspective view of the terminal used in FIG. 6A;

7A is a plan view showing another embodiment of a heater coil according to the present invention;

FIG. 7B is a perspective view of the terminal used in FIG. 7A. FIG.

* Explanation of symbols on the main parts of the drawings *

10 ... High Voltage Transformers 11 ... Brackets

12 ... lower core 13 ... E core

14 ... Primary coil 15 ... Pass core

16,100 ... heater coil 17 ... secondary coil

20 ... magnetron 30 ... cooling fan

101 ... Substrate 102,104 ... Wiring

103 ... hole 105,106 ... terminal

107 ... inner end 108 ... outer end

Next, embodiments of the present invention will be described in detail with reference to the drawings. 5A and 5B illustrate a heater coil of a high voltage transformer according to the present invention. The heater coil 100 of the high voltage transformer is formed by etching a printed circuit board.

The printed circuit board is formed by stacking copper foil on a substrate 101 made of a material such as paper-phenol resin or glass epoxy resin. ) Is formed of a rectangular track-shaped plate body, and a pattern printing and etching process are applied to the copper foil surface.

The pattern is such that a rectangular track-shaped wire 102 having a strip shape on the substrate 101 and having no connection portion is continuously formed at a predetermined interval, and is located near one side of the central hole 103. At the same time, the wiring 102 is started, and the wire 102 is wound three to four times along the shape of the central hole 103, and the wiring 102 is terminated at the peripheral surface of the substrate 101. The pattern printed circuit board is subjected to an etching process so that only the wiring 102 remains on the substrate 101. That is, the wiring 102 maintains a constant distance from the inner end portion 107 starting close to the central hole 103 to the outer end portion 108 ending, and has almost the same shape as the central hole 103. It is formed by winding 3-4 times.

The terminal 105 shown in FIG. 6B is connected to the inner end 107 and the outer end 108 of the wiring 102. The coupling portion 105a of the terminal 105 is interviewed to be coupled to the bottom surface of the substrate 101 of the outer end 108, but as illustrated in FIG. 6A, the connection portion 105b of the terminal 104 is connected to the wiring 102. And the same direction as the direction of?), And the soldering is performed at intervals generated by the thickness of the substrate 101 so that the terminal 105 and the outer end 108 are electrically connected to each other.

In addition, the inner end 107 and another terminal 105 to be electrically connected, the inner end 107 vertically penetrates the substrate 101, from the end of the substrate 101 Another bottom wiring 104 is formed to one side end portion, and the bottom wiring 104 is interviewed with the coupling portion 105a of the terminal 105. That is, the bottom surface 104 is formed by applying pattern printing and etching to the bottom surface of the substrate 101. The bottom wiring 104 is located on the opposite side in consideration of the interference with the inner end 107. Is formed.

In addition, a terminal 106 as illustrated in FIG. 7B may be connected to the inner end portion 107 of the wiring 102. The terminal 106 has a coupling part 106a that is interviewed and coupled to a bottom surface of the substrate 101, and a copper connection part 106c extending from the connection part 106b and the coupling part 106a to be bent at a right angle. Is formed. That is, the coupling portion 106a is joined to the bottom surface of the substrate 101 by an interview, and the copper foil connecting portion 106a is electrically connected to the inner end portion 107. Therefore, the copper foil connecting portion 106a is formed to have the same height as the thickness of the substrate 101.

According to the present invention configured as described above, a pattern of a rectangular track shape is formed on the substrate 101 by applying pattern printing and etching to a copper foil surface of a rectangular track-shaped printed circuit board having a central hole 103, thereby forming a stripe shape on the substrate 101. While only 102 is formed continuously at predetermined intervals, the terminal 105 or 106 is coupled to the inner end 107 and the terminal 105 is coupled to the outer end 108. Therefore, an expensive insulating coating material such as Teflon is not required, and by forming a heater coil without a winding process, production cost and productivity can be improved, and workability can be improved by wiring work by a terminal.

According to the present invention as described above, by applying the pattern printing and etching to the printed circuit board to obtain a heater coil, there is an effect that can reduce the production cost. In addition, there is an effect that can improve the workability by the connection work by the terminal.

Claims (4)

In the high-pressure transformer provided with the secondary coil of the lottery structure having a heater coil in the core and the primary coil of the single winding structure, The heater coil is formed of a printed circuit board formed in a square track shape so that a central hole is provided, and the pattern of the copper foil of the printed circuit board is patterned and etched to form a strip shape on the substrate, thereby forming a square track shape. The heater coil of the high voltage transformer, characterized in that only the wiring of the continuous formed at a predetermined interval. According to claim 1, wherein the bottom end wiring is formed on the bottom surface of the printed circuit board so that the inner end and one end of the wiring formed close to the central hole, the other end of the bottom wiring is the outside of the wiring A heater coil of a high voltage transformer, characterized in that it is positioned opposite the end. 3. The heater coil according to claim 1 or 2, wherein terminals are provided at the outer end and the end of the bottom wiring, respectively. 2. The heater coil of claim 1, wherein terminals are provided at inner and outer ends of the wiring, respectively.