JPH04123660U - flyback transformer - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the followability of the focus adjustment voltage to changes in the high-voltage output voltage in a flyback transformer in which the high-voltage coil is a laminated type and a focus pack resistor circuit is connected to the middle part of the high-voltage coil. . [Structure] The high voltage coil 3 constituting the flyback transformer is of a laminated type, and each coil portion 4a to 4g is connected in series via a high voltage rectifier diode 6. A resistance circuit of a focus pack 7 having a focus adjustment resistor 8 and a screen adjustment resistor 10 is connected to the cathode side of the rectifier diode 5c in the middle part of the high voltage coil. Coil part 4a~
A rectifier diode connected to a desired stage of 4f, for example, a capacitance adjustment capacitor 13 on the cathode side of the rectifier diode 5b.
One end of the capacitor 13 is connected to the other end of the capacitor 13, and the other end of the capacitor 13 is grounded to eliminate the inversion pulse generated on the cathode side of the rectifier diode 5c.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention uses a resistor circuit that adjusts and sets the focus adjustment voltage in the middle part of the high-voltage coil. This relates to the flyback transformer to which the is connected.

0002

[Conventional technology]

Figure 4 shows a typical flyback transformer circuit with a laminated high-voltage coil. It is shown. In the same figure, a low voltage coil 2 is fitted into a core 1, and this low voltage coil 2 is fitted into a core 1. A high voltage coil 3 is fitted on the outside of the coil 2.

0003 The high-voltage coil 3 is provided with an insulating film, for example, as an interlayer insulating material on the winding body of the high-voltage bobbin. The coil parts 4a to 4g are laminated through the coil parts 4a to 4f. The order in which voltages are added between the winding end end and the winding start end of the coil portions 4b to 4g of the next layer The rectifier diodes 5a to 5f are connected in series. the final stage The output end of the coil section 4g is connected to a cathode wire (not shown) via a high voltage rectifier diode 6. Connected to the anode of the tube. In the middle part of the high voltage coil 3, in the example of FIG. Focus on the cathode side of the rectifier diode 5c via the focus adjustment voltage terminal The resistance circuit of pack 7 is connected. This resistor circuit is a focus adjustment resistor. 8 and a screen adjustment resistor 10, the sliding end of the focus adjustment resistor 8 The focus adjustment voltage is set by slidingly adjusting the A focus adjustment voltage is applied to the focus electrode of the cathode ray tube and similarly By slidingly adjusting the sliding terminal 12 of the screen adjustment resistor 10, the screen adjustment voltage can be adjusted. is set, and the set screen adjustment voltage is applied to the screen electrode of the cathode ray tube. It is added.

0004

[Problem that the idea aims to solve]

Generally, when the brightness of a cathode ray tube screen changes, for example from a dark screen to a bright screen, , a high voltage output current flows from the high voltage coil 3 side to the cathode ray tube, and the high voltage output voltage E_Hdescends This phenomenon occurs. At this time, focus adjustment voltage E_FAlso high voltage output voltage E _H changes according to changes in This high voltage output voltage E_HRate of change and focus Adjustment voltage E_FWhen the rate of change of E is equal to the rate of change of the focus adjustment voltage E _F is the high voltage output voltage E_HThe focus may be blurred when the camera completely follows the changes in the However, in reality, each coil of the high voltage coil 3 There are variations in characteristics such as interlayer distributed capacitance of the layer portions 4a to 4g, and as a result, Variations occur in the regulation characteristics of the coil parts 4a to 4g, and the high voltage output voltage E_HFocus adjustment voltage E for changes in_FThe followability of curve F in Fig. 2 becomes worse. As shown in , the focus adjustment voltage E depends on the magnitude of the high voltage output current._Fand high pressure force voltage E_HFor example, when the screen changes from a bright screen to a dark screen, the ratio of When this happens, the problem arises that the focus becomes blurred.

[0005] This invention was made to solve the above conventional problems, and its purpose is to: Improves the followability of the focus adjustment voltage to the high voltage output voltage, and improves the tracking of the focus adjustment voltage to the high voltage output voltage. Flyback transformer that does not lose focus due to brightness changes Our goal is to provide the following.

[0006]

[Means to solve the problem]

In order to achieve the above object, the present invention is constructed as follows. That is, In this invention, high-voltage coils are layered and wound around a high-voltage bobbin with interlayer insulation material in between. The winding end of the coil part is the sum of the pulse voltage and the winding start end of the next layer's coil part. The middle section of the high voltage coil is connected via a forward rectifier diode. In a flyback transformer equipped with a focus adjustment voltage terminal, each layer The cathode side of at least one rectifier diode connected to the coil section The potential on the cathode side is set to almost zero potential in AC mode, and the distributed capacitance between the coil parts of each layer is The structure is characterized in that a capacitance adjustment capacitor is connected to the capacitor.

[0007]

[Effect]

In the present invention with the above configuration, a flyback transformer is added to the low voltage coil side. The flyback pulse is boosted by each coil part of the high voltage coil, but at this time, , each coil section has a flyback pulse and an inverted pulse of opposite polarity as shown in Figure 3. arise. In the present invention, at least one By connecting a capacitance adjustment capacitor to the cathode side of each rectifier diode, The potential on the cathode side of the rectifier diode to which the capacitance adjustment capacitor is connected is crossed. The potential becomes zero, and the inversion pulse in that part disappears. Disappearance of this inversion pulse affects other coil parts, and the interlayer distributed capacitance between each coil part changes. this The distributed capacitance of the high voltage coil is adjusted to the ideal distributed capacitance using changes in distributed capacitance. The followability of the focus adjustment voltage to the high output voltage can be improved.

[0008]

【Example】

Hereinafter, embodiments of the present invention will be described based on the drawings. In addition, in the explanation of this example, The same reference numerals are given to the same name parts as in the conventional example, and detailed redundant explanations are omitted. do. Figure 1 shows the circuit configuration of an embodiment of a flyback transformer according to the present invention. It is. The characteristic feature of this embodiment is that the coil portions 4a to 4g of the high voltage coil 3 The cathode side of the rectifier diodes 5a to 5f in the appropriate stage, in FIG. Connect one end of the capacitance adjustment capacitor 13 to the cathode side of the diode 5b to adjust the capacitance. The other end of the capacitor 13 is connected to ground, and the other configuration is the same as that described above. It is the same as the next case. The capacitance adjustment capacitor 13 has a sufficient voltage for the voltage at the connection point. Those with a capacity of 10 to 1000 PF and withstand voltage are used.

[0009] As mentioned above, the capacitance adjustment capacitor 13 is connected to the cathode side of the rectifier diode 5b. By connecting the connection, the potential of the connected part becomes zero potential in AC terms, and as a result, The inversion pulse generated in the coil portion 4b is eliminated. Due to the disappearance of this inversion pulse, , the influence spreads to other coil parts, and the distributed capacitance between each coil part 4a to 4g changes. do. By changing the distributed capacitance between each coil section, each coil section is regulated. The focus adjustment voltage's ability to follow changes in the high output voltage also changes. state changes.

FIG. 2 is a graph measuring the followability of the focus adjustment voltage when one end side of the capacitance adjustment capacitor 13 is connected to the cathode side of each of the rectifier diodes 5a to 5d at different positions. The other end of 13 is connected to ground or a specified potential part). Curve A is a case where a 100 PF capacity adjustment capacitor 13 is connected to the cathode of the first stage rectifier diode 5a, and curve B is a case where a 100 PF capacity adjustment capacitor 13 is connected to the cathode of the second stage rectifier diode 5b. Curve C shows the case where a 100 PF capacitance adjustment capacitor 13 is connected to the cathode of the third stage rectifier diode 5c, and curve D shows the case where a 100 PF capacitor 13 is connected to the cathode of the fourth stage rectifier diode 5d. Curve E shows the characteristics when two capacitance adjustment capacitors 13 of 100 PF are connected, and the first capacitance adjustment capacitor is connected to the second stage rectifier diode 5b. The characteristics are shown when a second capacitance adjustment capacitor is connected to the cathode of the third stage rectifier diode 5c. In this way, one or more capacitance adjustment capacitors 13 are used, and the distributed capacitance between the coil parts 4a to 4g differs depending on which rectifying diode 5a to 5f in each stage they are connected to the cathode side. Therefore, when the capacitance adjustment capacitor 13 is connected, it is connected to the rectifier diode at the stage where the change in the ratio between the high voltage output voltage E _H and the focus adjustment voltage E _F is the smallest.

[0011] The present invention is not limited to the above embodiments, and may be implemented in various ways. It is.

0012

[Effect of the idea]

This invention is connected to the coil part of each layer of a high-voltage coil that is laminated and wound. A capacitance adjustment capacitor is connected to the cathode side of at least one rectifier diode. Since the potential at the connection point is set to zero potential in AC terms, the potential generated at that part is It is possible to eliminate the inverted pulse caused by the The effect of the disappearance of this inversion pulse is Adjusts the distributed capacitance between the coil parts of each layer of the high voltage coil by spreading to the coil part of the high voltage coil. This allows the focus adjustment voltage to be added to changes in the high voltage output voltage. It is now possible to significantly improve the sensitivity, and the brightness of the cathode ray tube screen can be changed to Flyback with excellent focus characteristics that will not cause objects to go out of focus It becomes possible to provide a transformer.

[Brief explanation of drawings]

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

FIG. 2 is a measurement graph showing the follow-up characteristic of the focus adjustment voltage when the connection position of the capacitance adjustment capacitor is changed in this embodiment in comparison with a conventional example.

FIG. 3 is a waveform diagram showing flyback boost pulses and inversion pulses generated in each coil portion of a laminated type high voltage coil.

FIG. 4 is a circuit diagram of a conventional flyback transformer in which a high-voltage coil is of a laminated type and a resistance circuit of a focus pack is connected from the middle section.

[Explanation of symbols]

3 High voltage coil 4a~4g Coil part 5a~5f rectifier diode 7 Focus Pack 8 Focus adjustment resistor 10 Resistor for screen adjustment 13 Capacity adjustment capacitor

Claims (1)

[Scope of utility model registration request] Claim 1: A high-voltage coil is laminated and wound around a high-voltage bobbin via an interlayer insulating material, and the winding end of the coil section of each layer is rectified in the forward direction by adding a pulse voltage to the winding start end of the coil section of the next layer. In a flyback transformer that is connected through a diode and has a focus adjustment voltage terminal in the middle part of the high voltage coil, the cathode side of at least one rectifier diode connected to the coil part of each layer is A flyback transformer characterized in that a capacitance adjustment capacitor is connected to adjust the amount between the coil portions of each layer by bringing the potential on the cathode side to almost zero potential in an alternating current manner.