JPS59126369A - High voltage stabilizing device - Google Patents

Abstract

PURPOSE:To realize a high voltage stabilizing circuit sufficiently capable of response to a high voltage change in a fast changing speed by incorporating a high voltage breeder resistor into a flyback transformer at a position where the effect of leakage inductance of the said flyback transformer is less. CONSTITUTION:In the figure, 1 is the high voltage breeder resistor, 14 is a high voltage rectifier diode, 15 is a high voltage cable, 16 is an anode cap, 18 is a ferrite core, 19 is a gap, 20 is a high voltage winding and 21 is a drive winding, 22 is a high voltage breeder resistor storage section, and 23 is a cable connected to a point (e), i.e., variable resistor. A shield wire is used for the cable so as not to generate an induced voltage even if the cable approaches to a coil of the flyback transformer. Since the fitting position of the high voltage breeder resistor is at the uppermost part of the flyback transformer and positioned laterally, the effect of leakage inductance is least and the level gives no problem in the circuit operation. Further, one high voltage cable is enough, since it is connected from a point (a) of the flyback transformer 12 to a point (d) of a cathode ray tube.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a high voltage stabilizing device that can be used in television receivers and cathode ray tube display devices.

Conventional Structure and Its Problems FIG. 1 shows a commonly used high voltage stabilizing circuit. According to the change of high voltage, the voltage of 10B is set to 2, -.

This is a circuit system that is controlled by a resistor 7 and keeps the high voltage constant. 1 is a high voltage bleeder resistor for high voltage detection, and 2 is a voltage dividing resistor of 1 and a high voltage adjustment volume. Resistance 3. A Zener diode 4 provides a reference voltage for a DC amplifier 6. 6 is a transistor that drives the control transistor. 8 is an oscillation circuit and a drive circuit. Since the oscillation circuit is synchronized with the horizontal deflection circuit, it is often used in common with the oscillation circuit of the horizontal deflection circuit. 9 is a high voltage output transistor, 1o is a resonant capacitor, 11 is a damper diode, and 12 is a flyback transformer. These operations are exactly the same as those of the horizontal deflection output circuit and are well known.

A flyback transformer often has a built-in high voltage rectifier diode 14. A high voltage generated by a flyback transformer is applied to the anode electrode of the cathode ray tube.

What complicates manufacturing in this method is the connection between the flyback transformer and the high voltage bleeder resistor 1. If there is no high-voltage bleeder resistor 1, only one high-voltage cable is needed to connect the cathode wire 3-page core tube anode electrode from the flyback transformer, but as shown in Figure 1, the high-voltage cable connects the flyback transformer a.
Connect point to point to high voltage bleeder resistor.

A total of two connections are required: the high voltage bleeder resistor at point C and the cathode ray tube anode electrode.

Since a high voltage is applied to a high-voltage bleeder resistor, it has a structure that is sealed in a case with an insulating material for voltage resistance and safety reasons, and its shape is also large.

Therefore, the means for connecting the two becomes difficult to manufacture.

There are two connection means. One is to use connectors. This has good productivity because the flybank transformer and high voltage resistor can be manufactured separately, but it is difficult to insulate the connector and requires a large connector. Another option is to connect the two directly. This is 2 in the manufacturing process.
Since it is manufactured by connecting two large pieces with lead wires, automation is difficult and productivity is poor. Regarding the fixing means, flyback transformers are often installed on printed circuit boards, which poses many problems, but high-voltage bleeder resistors are often fixed on other than printed circuit boards, and high voltage is applied and force is applied, so it is difficult to fix them. Careful attention must be paid to insulation. Separating the flyback transformer and the high-voltage bleeder resistor in this way is disadvantageous in terms of extremely low productivity and high costs.

OBJECTS OF THE INVENTION The present invention takes the above points into consideration and aims to provide a flyback transformer with high productivity and a built-in high voltage bleeder resistor at low cost.

Structure of the Invention The present invention provides a method in which a high voltage output terminal obtained by rectifying the output pulse of a flyback transformer is grounded through a series circuit of a high voltage bleeder resistor and an external resistor, and a series circuit with the voltage dividing resistor is connected to the ground. The high-voltage bleeder resistor is connected to the flybank transformer at a position where it is less affected by the leakage inductance of the flybank transformer. Built-in high voltage stabilizer.

DESCRIPTION OF THE EMBODIMENTS Page 5 FIG. 2 shows one embodiment, and the same parts as in FIG. 1 are given the same numbers and their explanations are omitted. The feature of this device is that the high voltage bleeder resistor 1 is built into the flyback transformer. In this way, only one high-voltage cable is required to connect point a of the flyback transformer 12 to point d of the cathode ray tube. When the high voltage leader resistor 1 for detection of the high voltage stabilization circuit is built into the flyback transformer 12,
A problem occurs. This causes an induced voltage to be generated in the high-voltage bleeder resistor 1 due to the leakage flux of the flyback transformer 12, and this induced voltage appears at point e in Figure 2, which passes through the volume 2 and enters the input stage of the error detection amplifier. As a result, the high voltage stabilizing circuit will no longer function properly. Therefore, FIGS. 3, 4, and 6 show structural diagrams of the most rational flyback transformer with a built-in high-voltage leader resistor. 1
is a high voltage bleeder resistor, 14 is a high voltage rectifier diode, 16
is the high voltage cable, 16 is the anode cap, 1 is the second
Point e in the figure indicates a connection terminal to be inserted into a printed circuit board, 18 indicates a ferrite core, 6/, 219 indicates a high voltage winding, and 21 indicates a drive winding. The structures shown in Figures 3 to 6 are small in shape;
Moreover, the 0 point in FIG. 2 is reasonable because the volume and pattern wiring can be done within the printed circuit board. However, as mentioned above, this structure is disadvantageous in that it is susceptible to induced voltage. Since the high voltage resistor 1 is close to the high voltage coil and drive coil, the induced voltage is also large. This voltage reaches several tens of volts at point e. The component of this induced voltage is a pulse component of the horizontal deflection frequency. If a bypass capacitor is added between point e and ground in order to remove this component, it will become smaller. However, since the voltage waveform at point e is unrelated to the voltage change at point a, which is the voltage to be stabilized, the high voltage cannot be stabilized sufficiently. By adding the above-mentioned bypass capacitor to point e, it is possible to sufficiently respond to relatively gradual high voltage changes (less than the vertical period), but it is possible to respond sufficiently to relatively gradual high voltage changes (less than the vertical period), but for example, interlace operation or horizontal changes such as a part of a CRT screen shining It cannot respond to stabilization of high voltage that changes periodically.

Therefore, although the full-circle back transformer having the structure shown in Figs. 3 to 5 is reasonable from a structural point of view, it is not satisfactory in terms of performance, and therefore the range of application of high voltage stabilizing circuits is limited. The effect cannot be expected. FIGS. 6 to 8 are structural diagrams of a flybank transformer with a built-in high-voltage leader resistor that solves the above-mentioned problems in an embodiment of the present invention. Since the same part numbers as in FIG. 2 are the same as in FIG. 2, explanations thereof will be omitted. 22 is a high voltage leader resistance housing section.

23. is the cable connected to the 0 point in FIG. 2, that is, the volume. Shielded wire is used to prevent induced voltage from occurring even when this cable approaches the coil of the flyback transformer. The feature of this flyback transformer is that the high voltage bleeder resistor is installed at the top of the flyback transformer, unlike in Figures 3 to 6, and in the horizontal direction, unlike the vertical direction in Figures 3 to 6. That is what we are doing.

In other words, the influence of leakage inductance is the smallest and the level of leakage inductance does not cause any problem in circuit operation, the shape is compact so that productivity does not decrease, and sufficient safety and insulation against high voltage can be ensured. , it has a structure that can satisfy all of these conditions.

Effects of the Invention As described above, the flyback transformer with a built-in high voltage bleeder resistor makes it possible to realize a high voltage stabilization circuit that can sufficiently respond to fast-changing high voltage changes even if the high voltage bleeder resistor is built into the flyback transformer. Dogs are effective in terms of productivity, cost reduction, and safety. Recently, as the use of CRT displays has expanded with the spread of computers, higher quality screens have been desired. High voltage stability is an important part of this product quality.
It is expected that it will be used even more in the future.

Among these, the ability to supply inexpensive high voltage stabilization circuits has a significant effect.

[Brief explanation of drawings]

Figure 1 shows the circuit of a conventional high voltage stabilizer.
□ Circuit diagram, Figure 2 is a circuit diagram of a high voltage stabilizing device according to an embodiment of the present invention, Figures 3, 4, and 6 are page 9 with a built-in high voltage bleeder resistor that was removed prior to the present invention. Type flyback transformer structure diagram, Figures 6 and 7. FIG. 8 is a structural diagram of a flyback transformer with a built-in high voltage bleeder resistor used in the present invention. 12...Fly bank transformer, 14...
...High-voltage rectifier diode, 1...Pressure bleeder resistor, 13...Cathode ray tube, 2...Amplifier. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (1)

[Claims] The high voltage output terminal obtained by rectifying the output pulse of the flyback transformer is grounded through a series circuit of a high voltage bleeder resistor and a voltage dividing resistor, and the voltage of the voltage dividing resistor is used to control the high voltage stabilizing circuit. A high voltage stabilizing device configured to have the high voltage bleeder resistor built into the flyback transformer at a position where the leakage inductance of the flyback transformer is small.