JPH11219835A - Flyback transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flyback transformer, having a structure in which static electricity charged due to the impression of a high voltage is difficult to be transmitted to a high voltage case in a part for a high voltage. SOLUTION: A flyback transformer is provided with a transformer and a high voltage diode 24, and the flyback transformer outputs a high voltage in accordance with the input of a flyback pulse. This flyback transformer is provided with a part for a high voltage, such as a high voltage capacitor 41 for correcting a screen and a breeder resistor 40, and also this device is provided with a transformer case 10 for housing the transformer and the high voltage diode 24, and a high voltage case 11 for housing the part for a high voltage. In this case, the flyback transformer, in which the transformer case 10 is interfit into the high voltage case 11 is provided with a holder 50 for holding the part for a high voltage separately from the high voltage case 11, and the holder 50 is fixed to the high voltage case 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a flyback transformer for supplying a high voltage to a cathode ray tube such as a television receiver.

[0002]

2. Description of the Related Art A cathode ray tube requires a high voltage such as an anode voltage of several tens of kV and a focus voltage of about 10 kV. Such a high voltage is obtained by using a flyback pulse generated during a retrace period of the sawtooth wave current flowing through the horizontal deflection coil to boost the voltage with a transformer and rectify the voltage with a high voltage diode. In general, a device that includes a transformer and a high-voltage diode and outputs a high voltage by inputting a flyback pulse is called a flyback transformer (FBT).

FIG. 10 shows an example of a high voltage generating circuit in an FBT. FBT has transformer high voltage coil
(22) is divided into several segment coils (220), and each segment coil (220) is connected in series by a high-voltage diode (24). An output from the high voltage coil (22) is an anode output terminal for outputting the anode voltage.
(33). High voltage coil (22) and anode output terminal
The lead connecting (33) has a high-voltage capacitor (41) for correction.
Is connected to a bleeder resistor (40) for voltage adjustment. The output from the high voltage coil (22) through the bleeder resistor (40)
The voltage is supplied to the voltage adjustment terminal (48) and used for stabilizing a high voltage.

FIG. 9 is a sectional view showing a conventional FBT. Each component of the FBT is stored in a case. To secure insulation space between transformer components such as a transformer and a high voltage diode (24) and high voltage components such as a high voltage capacitor (41) and a bleeder resistor (40) connected to the high voltage coil (22) of the transformer, The case is composed of a transformer case (90) in which transformer components are mainly provided and a high-pressure case (91) in which high-voltage components are mainly provided. After fixing the high-voltage parts to the high-pressure case (91), disposing the transformer parts near the high-pressure case (91), and performing various wiring, cover the transformer parts with the transformer case (90), (90) and high pressure case
The FBT is completed by fitting (91), pouring an insulating resin into the case and curing it.

[0005]

The high-voltage wiring (92) for connecting the high-voltage coil (22) to the high-voltage capacitor (41) and the bleeder resistor (40) is used to secure an insulating space with other components. Are held by holding pieces (93) formed in the high-pressure case (91). The bleeder resistor (40) is formed by forming a resistance pattern on a ceramic substrate (402), and the ceramic substrate (402) is fixed to a high-pressure case (91).

Normally, various components in the FBT can secure an insulating space by the insulating resin filled in the case, and can prevent short-circuiting or discharge to the outside during use. However, for example, when used in an area with low humidity, when a high voltage is applied to the high-voltage component, the periphery of the high-voltage wiring (92) is charged, and this static electricity is charged by the holding piece (9).
It may be transmitted to the high-pressure case (91) through 3). Also,
If the resistance pattern of the bleeder resistor (40) is in direct contact with the high-pressure case (91), the periphery of the resistance pattern may be charged, and this static electricity may be transmitted to the high-pressure case (91).
At this time, static electricity is transmitted along the case surface,
When the voltage reaches the external connection terminal (94) provided in (91), a voltage fluctuation of about several tens of volts occurs instantaneously with respect to the external connection terminal (94). For example, this external connection terminal (94) is
In the case of (48), this voltage fluctuation destabilizes the high voltage. For example, intermittent flickering occurs on the monitor screen during use of the monitor including the FBT. Further, there is a concern that the charging of the surface of the high-pressure case (91) may affect other devices.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide an FBT having a structure in which static electricity charged when a high voltage is applied to a high-voltage component is hardly transmitted to a high-voltage case.

[0008]

According to the present invention, there is provided a flyback transformer comprising a transformer and a high-voltage diode and outputting a high voltage in response to a flyback pulse input. Equipped with high-voltage components such as high-voltage capacitors and bleeder resistors, a transformer case for storing a transformer and a high-voltage diode, and a high-pressure case for storing high-voltage components. In the flyback transformer, a holder for holding the high-pressure component separately from the high-pressure case is provided, and the holder is fixed to the high-pressure case.

[0009]

Since the holder fixed to the high-pressure case holds the high-pressure component at a distance from the high-pressure case, the high-pressure component does not come into direct contact with the high-pressure case. Therefore, it becomes difficult for the static electricity charged when a high voltage is applied to the high-voltage component to be transmitted to the high-pressure case, and it is possible to prevent charging on the high-pressure case surface.

[0010]

Embodiments of the present invention will be described below. 1 to 3 show one embodiment of the FBT of the present invention. As described above, the case for storing various parts of the FBT includes the transformer case (10) and the high-pressure case (11).
Each of the cases (10) and (11) is formed of plastic or the like into a shape that matches the components to be stored.

The transformer case (10) includes a low-voltage coil (20).
A low-voltage coil bobbin (21) provided with a high-voltage coil (22) and a high-voltage coil bobbin (23) provided with a high-voltage coil (22)
Transformer components that constitute the transformer are mainly stored. The low-voltage coil bobbin (21) is formed in a cylindrical shape, and its base end has an input to the low-voltage coil (20) and a low-voltage coil (2).
Input / output terminals (30) for connecting to an external circuit board for output from 0) or other outputs are provided. A conductor is wound around the outer periphery of the low-voltage coil bobbin (21), and a predetermined input / output terminal (3
0), a low-voltage coil (20) is formed.

A high-voltage coil bobbin (23) is provided around the low-voltage coil (20). The high-voltage coil bobbin (23) is formed in a cylindrical shape, and a plurality of protruding pieces (31) are arranged on both end faces in one outward direction, and each protruding piece (31) has a high-pressure coil. Diode connection terminal to connect diode (24)
(32) is fixed. In the present embodiment, the arrangement direction of the protruding pieces (31) is the direction in which the high-voltage case (11) is fitted in order to extract the focus voltage output from the lead wire (25) of the high-voltage diode (24). A wire is wound around the outer periphery of the high-voltage coil bobbin (23), and the wire end is connected to the diode connection terminal.
By connecting to (32), the segment coil (220)
(See FIG. 10), and the segment coil (22
A high-voltage diode (24) is connected between the diode connection terminals (32) and (32) on both ends of the high-voltage coil bobbin (23) by winding an insulating film around the (22) is formed.

The lead wire (25a) of the high voltage diode (24) having the highest voltage is connected from the protection resistor (26) to the anode output terminal (33). In order to hold the anode output terminal (33), a cylindrical terminal holding portion (34) is formed at the upper edge of the high-voltage coil bobbin (23), and the terminal holding portion (34) has an anode output cable ( 15) is inserted and connected to the anode output terminal (33). As described later, the anode output terminal (33) is connected to a bleeder resistor (40) and a high-voltage capacitor (41) via a conductor.

The high-voltage case (11) includes components for outputting a focus voltage and a screen voltage, a bleeder resistor (40) for stabilizing a high voltage, and a high-voltage capacitor (41) for correction.
High-voltage components related to the output from the high-voltage coil (22) are mainly stored. These high-pressure parts are
Hold the holder vertically (5
0), and the holder (50) is fixed to the high-pressure case (11). The holder (50) is integrally formed of plastic. It is desirable that the material of this plastic is excellent in heat resistance and strength resistance, such as PBT (polybutylene terephthalate).

The structure of the holder (50) will be described below with reference to FIGS. In addition, regarding the holder (50), the transformer case (10)
Is defined as a front direction, and the opposite direction is defined as a rear direction. That is, in FIG. 2, the left side of the paper is the front side, the right side is the rear side, the front side of the paper is the left side, and the back side is the right side. Holder (5
0) includes a flat base member (51), and the right side surface of the base member (51) has curved plates (52) (5) from an upper portion, a central portion, and a lower portion, respectively.
2) (52) is protruding. The curved plates (52), (52), (52) are alternately curved so as to sandwich the high-voltage capacitor (41). Substrate
A leg piece (53) protrudes from the upper end of (51), and a clamping piece (54) for clamping the lead wire (410) of the high-voltage capacitor (41) is provided at the tip of the leg piece (53). You.

A pair of long plates (55) and (56) which are substantially parallel to the front-rear direction project from the upper portion of the left side surface of the base (51). This long plate
(55) and (56) are used to clamp a box (80) in which a bleeder resistor (40) described later is stored. At the tip of the rear long plate (56), a stopper claw (57) for preventing the box (80) from being pulled out is provided, and a regulating piece (58) for restricting the upward movement of the box (80).
Extends upward and stands forward. In the restriction piece (58), the left end is a lead wire (410) of the high-voltage capacitor (41).
A hook groove (59) for hooking the lead wire (410) is provided, and a holding piece (60) for holding the lead wire (410) is provided on the rear surface. Also,
A protection plate (61) for preventing the lead wire (410) from coming into contact with the high-pressure case (11) is provided at an upper central portion of the rear long plate (56).

In the upper part of the left side of the base (51), below the pair of long plates (55) and (56), a high-pressure case (11)
A pair of fitting pieces (62) fitted with the prism projections (110) formed on
a) (62b) protrudes from the front side and the rear side, respectively.
On the left end face of the rear fitting piece (62b), a high-pressure case (11)
A fitting plate (63) having a through hole (64) for fitting with the cylindrical projection (111) formed at the bottom is protruded.

A terminal block for fixing a metal output extraction terminal (42) for extracting an output for a focus voltage from a lead wire (25b) of a predetermined high-voltage diode (24) is provided at the center rear portion of the left side surface of the base (51). (65) is deployed. At the upper end of the terminal block (65),
A hook piece (66) is formed to hook the tip of a focus output cable (16) for supplying a focus voltage output to the outside. The lower end of the terminal block (65) is connected to a pair of long plates (6
8) Connected to (69). In addition, a connecting portion (422) of an output extraction terminal (42) described later is provided at a central front portion of the left side surface of the base (51).
A restricting piece (67) is provided to prevent (see FIG. 6) from moving in the left-right direction.

A pair of long plates (68) (69) projecting from the lower part of the left side surface of the base (51) are provided substantially parallel to the front-rear direction. This long plate
(68) (69), like the pair of long plates (55) (56), box (80)
Used to pinch. At the base ends of the pair of long plates (68) and (69), cylindrical projections formed on a high-pressure case (11) described later are provided.
(112) and a guide groove for guiding the focus output cable (16) from outside to the terminal block (65) of the holder (50)
(71) is opened, and a holding claw (77) for holding a lower end of a fixing portion (420) of an output extraction terminal (42) described later is provided.

At the distal end of the front long plate (68), a retaining claw (72) for preventing the box body (80) from being pulled out is provided, and near the proximal end and the distal end, an external circuit board and an external circuit board are provided. Leg pieces (73) (74) for holding external connection terminal pins (43) (44) to be connected project downward. The ends (730) and (740) of the legs (73) and (74) extend in the left and right outer directions, and are divided into three so that the terminal pins (43) and (44) are inserted. Inner fingers (732) and (742) open to the rear. Outer finger (731) (741) of each leg end (730) (740)
As shown in FIG. 5, fitting grooves (733) and (743) for fitting with the terminal pins (43) and (44) are respectively opened. Notches (734) (735) (744) (745) are formed at the tip of each leg end (730) (740) so that each terminal pin (43) (44) can be easily inserted. ing. Also, on the rear surface of the rear long plate (69), a foot piece mounted on a seat piece (113) formed in a high-pressure case (11) described later.
(75) is deployed.

Structure of other parts The bleeder resistor (40) has a resistance pattern formed on a ceramic substrate, and is integrally formed of the same material as the holder (50) to prevent epoxy cracks due to heat shock. Stored in a box (80). On the inner surface of the box (80) are holding pieces (81), (81), (8) for holding the ceramic substrate (402).
1) (81) extends in the left-right direction. In addition, on the outer surface of the box (80), in order to prevent the box (80) from moving downward when the box (80) is sandwiched between the holder (50), the front of the upper part of the holder is provided. Restriction pieces (82) (82) extend at positions adjacent to the upper side surfaces of the long plate (55) and the lower rear long plate (69), respectively.

The high-pressure case (11) is shown in FIGS.
As shown in the figure, holder (50), high-voltage condenser (41), box
Formed along (80), the fitting pieces (62a) (62b), through holes (64) (70), and foot pieces (75) of the holder (50) correspond when fixing the holder (50) To each of the prismatic projections (110),
Cylindrical projections (111) and (112) and seat pieces (113) are formed. The high-pressure case (11) has a guide groove (114) for guiding the focus output cable (16) from the outside to the inside of the high-pressure case (11).

As shown in FIG. 2, FIG. 3, and FIG. 6, the output extraction terminal (42) includes a fixing portion (420) fixed to the terminal block (65) of the holder (50), and a fixing portion (420). And a connecting portion (422) connected to the lead wire (25b) of the high-voltage diode (24) standing forward from the front. The upper end (421) of the fixed portion (420) is bent rearward with its center protruding to connect to the focus output cable (16). The tip (423) of the connection part (422) is connected to the lead wire (25b) of the high-voltage diode (24).
It is divided into three, and the legs are opened alternately so as to sandwich the lead wire.

The external connection terminal pins (43) and (44) are made of metal. As shown in FIGS. 2, 3 and 6, the external connection terminal pins (43) and (44) are vertically moved from the leg end portions (730) and (740) below the holder (50). It has flanges (430) and (440) for preventing the slipping in the direction. The collar (430)
(440) is the inner finger (732) (742) at one leg end (730) (740)
And one of the outer fingers (731) (741).

Assembling Procedure The procedure for assembling the flyback transformer having the above configuration will be described. First, a procedure for disposing various components on the holder (50) will be described. As shown in FIG. 6, the terminal block (65) of the holder (50)
Insert the output extraction terminal (42) from the front into the restriction piece (67), and insert the external connection terminal pins (43) and (44) into the left and right outer sides of each leg end (730) (740) at the bottom of the holder. Insert from. As described above, since the holder (50) is integrally formed of plastic, each component of the holder (50) has some elasticity. Therefore, when the terminal pins (43) and (44) are pressed against the leg end portions (730) and (740) from the left and right outer sides, the outer fingers (731) and (741) and the inner fingers (732) and (742) of the leg end portions. ) Is bent outward and forward, the terminal pins (43) and (44) are inserted, and the terminal pins (43) and (44) are fitted into the fitting grooves (733) and (743) at one end of the leg, so that The finger (731) (741) and the inner finger (732) (742) elastically return, and the terminal pin flanges (430) and (430) between the outer finger (731) (741) and the inner finger (732) (742). 440) is inserted, and the terminal pins (43) and (44) are fixed to the leg end portions (730) and (740). Next, the focus output cable (16) is inserted from below into the guide groove (71) at the lower part of the holder, passes over the terminal block (65), and is connected to the distal end of the cable (16).
(160) is hooked on the hook piece (66) of the terminal block (65) and soldered to the upper end (421) of the output extraction terminal (42).

Next, as shown in FIG.
(41) is pressed between the curved plates (52) on the right side of the holder (50). Then, the high-voltage capacitor (41) is inserted by bending the curved plate (52), and when the curved plate (52) and the high-voltage capacitor (41) are fitted, the curved plate (52) elastically returns to return to the high-voltage capacitor (41). Hold 41). Next, the box (80) containing the bleeder resistor (40)
Is pressed between the upper pair of long plates (55) and (56) on the left side of the holder (50) and the lower pair of long plates (68) and (69). Then
When the long plates (55), (56), (68), and (69) bend, the box (80) is inserted, and the retaining claws (57) of the upper rear long plate (56) and the lower front long plate
When the box (80) passes through the retaining claws (72) of (68), each long plate (55)
(56) (68) (69) elastically returns and clamps the box (80), and the retaining claws (57) (72) prevent the box (80) from being pulled out to the left, The upper rear long plate (56) is prevented from being pulled out upward by the restriction piece (58) of the upper rear long plate (56).
Of the box body (80) against the lower side of the lower rear long plate (69) and the lower side of the lower long plate (69) abuts against the lower side of the lower side long plate (69) to prevent downward pull-out. The box (80) is a holder (50)
Fixed to

Next, the high-voltage side lead wire (410) of the high-voltage capacitor (41) is connected to the holding piece (54) of the upper leg piece (53) of the holder (50).
The front of the protection plate (61) of the upper rear long plate (56), and the upper rear long plate
The control piece (58) of (56) is passed in the order of the catch groove (59), and the low-voltage side lead wire (411) of the high-voltage capacitor (41) is fixed to the leg piece end (730) at the lower part of the holder (50). Soldered to the external connection terminal pin (43). Also, the high voltage side lead wire (400) of the bleeder resistor (40) is soldered to the lead wire (410) of the high voltage capacitor (41) passing through the hook groove (59), and the low voltage side lead wire (401) Is soldered to the external connection terminal pin (44) fixed to the leg end (740) at the bottom of the holder (50).
Deployment of various components to (50) is completed. The external connection terminal pin (44) connected to the bleeder resistor (40) becomes a voltage adjustment terminal (48) for supplying a voltage adjustment output to the outside as shown in FIG.

Next, as shown in FIG. 8, the holder (50) provided with various components is carried forward of the high-pressure case (11), and the prismatic projection (110) of the high-pressure case (11) is attached to the holder (50). Mating piece (62a)
(62b), the cylindrical projections (111) and (112) of the high-pressure case (11) fit into the through holes (64) and (70) of the holder (50), respectively.
The holder (50) is stored and fixed in the high-pressure case (11) so that the foot (75) of the holder (50) is placed on the seat (113) of (11).
Next, the focus output cable (16) is passed through the guide groove (114) of the high-pressure case (11), and the attachment of various components to the high-pressure case (11) is completed.

Next, as described above, the high-voltage coil bobbin (23) provided with the high-voltage coil (22), the high-voltage diode (24) and the resistor (26) is mounted on the low-voltage coil bobbin (21) provided with the low-voltage coil (20). ) Is carried near the high-voltage case (11) to which various components are attached, and the surface of the transformer-side component where the high-voltage diodes (24) are arranged and the output extraction terminal ( The transformer-side component and the high-voltage component are connected so that the protruding surface of the high-voltage diode (24) faces the specified lead wire (25b) and the leading end (423) of the output extraction terminal (42) is inserted therebetween. The case (11) is approached, and the high voltage side lead wire (410) of the high voltage capacitor (41) is soldered to the anode output terminal (33). Then, the transformer case (10) is put on the transformer-side component from above, the transformer case (10) and the high-pressure case (11) are fitted, and an insulating resin such as epoxy resin is injected into the fitted case. The FBT shown in FIG. 1 is completed by hardening and disposing a transformer core (18).

Accordingly, the holder (50) fixed to the high-pressure case (11) allows the high-voltage capacitor (41), its high-voltage side lead wire (410), high-pressure components such as the bleeder resistor (40) to be connected to the high-pressure case. Since it is held apart from (11), the high-pressure part does not come into direct contact with high-pressure case (11). Therefore,
The static electricity charged by the application of the high voltage to the high-voltage component is less likely to be transmitted to the high-pressure case (11), so that charging on the surface of the high-pressure case can be prevented. In addition, since the external connection terminal pins (43) and (44) are also held apart from the high-voltage case (11) by the holder (50), static electricity charged by application of a high voltage to the high-voltage parts is reduced. Even when transmitted to the high-pressure case (11), the static electricity transmitted to the high-pressure case (11) is less likely to be transmitted to the terminal pins (43) and (44), and instantaneous voltage fluctuations at the terminal pins (43) and (44) Can be prevented. In particular, it is possible to prevent instantaneous voltage fluctuations at the terminal pin (44) serving as the voltage adjustment terminal (48), and to maintain high voltage stability.

Also, a connection part (422) of the output extraction terminal (42)
The movement of the holder (50) in the left and right direction is restricted by the restriction piece (67) at the center of the holder (50).
It can be prevented from moving in the arrangement direction of 4) and coming into contact with the lead wire (25) of the adjacent high voltage diode (24).

Each component of the holder (50) can be elastically deformed, and the high-voltage capacitor (41) held by the holder (50), the output terminal (42), the box (80), Terminal pin (43)
(44) etc.
Holder can be used as a holder without using press-fitting means and jigs
(50) can be easily mounted, so that the assembling work of the FBT is efficient and simplified. In particular, conventionally, as shown in FIG. 9, the external connection terminal (94) was fixed by melting the holding piece (95) of the high-pressure case (91), and welding means and the like were required. In the embodiment, the external connection terminal pins (43) and (44) can be easily fixed to the holder (50) without using welding means or the like, and as a result, the assembly efficiency of the FBT is increased.

The description of the above embodiments is for the purpose of describing the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof.
Further, the configuration of each part of the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made within the technical scope described in the claims.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a flyback transformer according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along a line AA in FIG. 1 and viewed in a direction indicated by an arrow.

FIG. 3 is a cross-sectional view taken along the line BB of FIG. 2 and viewed in the direction of the arrow.

FIG. 4 is a perspective view showing a holder used in the embodiment.

FIG. 5A is a bottom view showing an end of a right leg under the holder, and FIG. 5B is a bottom view showing an end of a left leg under the holder.

FIG. 6 is an assembly diagram showing a state in which an output extraction terminal, an external connection terminal pin, and a focus output cable are provided in a holder.

FIG. 7 is an assembly diagram showing a state in which a high-voltage capacitor and a box housing a bleeder resistor are provided in a holder.

FIG. 8 is an assembly view showing a state in which a holder in which various components are arranged is fixed in a high-pressure case.

FIG. 9 is a sectional view showing a conventional flyback transformer corresponding to FIG.

FIG. 10 is a circuit diagram showing a general circuit configuration of a flyback transformer.

[Explanation of symbols]

 (10) Transformer case (11) High voltage case (20) Low voltage coil (22) High voltage coil (24) High voltage diode (40) Bleeder resistor (41) High voltage capacitor (42) Output terminal (43) External connection terminal (44 ) External connection terminal (48) Voltage adjustment terminal (50) Holder

Claims (4)

[Claims] 1. A flyback transformer comprising a transformer and a high-voltage diode (24) and outputting a high voltage in response to a flyback pulse input, comprising: a high-voltage capacitor (41) for screen correction; and a bleeder resistor (40). A transformer case (10) containing high-voltage components such as a transformer and containing a transformer and a high-voltage diode (24), and a high-voltage case (11) containing high-voltage components
And a transformer case (10) and a high-pressure case (11)
A holder (50) for holding the high-voltage component separately from the high-pressure case (11) in the flyback transformer in which the high-pressure case is fitted, and the holder (50) is fixed to the high-pressure case (11). A flyback transformer characterized by the following. 2. The high-voltage diode (24) includes a high-voltage case (11).
The holder (50) has an output extraction terminal (42) for extracting output from a lead wire (25b) of a predetermined high-voltage diode (24), and a tip of the output extraction terminal (42). Department
(423) is provided with regulating means for preventing the high-voltage diode (24) from moving in the arrangement direction,
The flyback transformer according to claim 1. 3. The flyback according to claim 1, wherein the holder (50) holds external connection terminals (43) and (44) connected to an external circuit board. Trance. 4. An external connection terminal (43) (4) in a holder (50).
An elastic piece which is bent by insertion of the external connection terminals (43) and (44) and fits with the external connection terminals (43) and (44) is provided in the holding portion of (4). The flyback transformer described in 1.