JPS6080372A - High pressure generator - 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] The present invention relates to a high voltage generator that supplies high voltage to a power source.

Generally, in a high voltage generator that supplies high voltage to a cathode ray tube anode, switching operation and L
, 0 The pulse voltage generated in the resonant circuit is boosted by a high-voltage coil and rectified using a rectifier diode to obtain a predetermined high voltage. In this case, the pulse voltage is generated during the retrace period, but the distribution It is known that due to the capacitance and cage inductance, harmonics of a much higher frequency than the fundamental wave of the flyback pulse are superimposed on the pulse as ringing. This ringing energy then spreads to various parts of the television circuit through capacitive coupling or electromagnetic coupling, and as a result, it appears as vertical stripes of brightness and darkness on the screen of the cathode ray tube, degrading the image quality, and causing unnecessary damage to the high-voltage coil. Therefore, it is necessary to eliminate such disadvantages, that is, to obtain a high voltage generator that does not cause ringing, in order to obtain good image quality characteristics, and ,
This was strongly desired from the standpoint of safety.

In contrast, in the past, ringing was prevented by improving and adding external factors such as the wiring of lead wires of electrical circuit components that do not pick up ringing components, the design of printed circuit boards, or the addition of circuit components. Although it was possible to obtain a high-pressure generator, this required a great deal of effort, time, and expense.

For this reason, in recent years, high-voltage generators have been constructed by connecting a resistor that damps the ringing current in series on the low-voltage side of the high-voltage coil, or by connecting a resistor and coil (inductance) that also damps the ringing current on the low-voltage side of the high-voltage coil. ) by connecting parallel circuits in series, etc.
It has been proposed that the high voltage generator (flyback transformer) itself is provided with means for removing ringing.

However, among these configurations, in those in which a resistor is connected in series to the low-voltage side of the high-voltage coil, the ringing energy is consumed by the resistor and the ringing is attenuated, but at the same time, the current of the basic pulse of the high-voltage generator is also divided into harmonic components. This basic pulse is also consumed and lost, increasing power loss (reduction in high voltage output, increase in current flowing through the low voltage coil), and has the disadvantage of ringing energy. In the case where a parallel circuit of a resistor and a coil is connected in series on the low voltage side of the
Although the ringing energy is consumed by the resistance and the ringing is attenuated, the use of a choke coil requires a coil using a separate core, which has the drawback of complicating the configuration and increasing costs.

The present invention relates to a high-pressure generator button aimed at eliminating the above-mentioned drawbacks, and in particular, a high-pressure generator having a configuration that consumes ringing energy generated in the high-pressure generator without losing the basic pulse of the high-pressure generator. It is related to.

EMBODIMENT OF THE INVENTION Hereinafter, one embodiment of the high pressure generator of the present invention will be described in detail using the drawings. In Figures 1 and 2, the core! A low-voltage coil 2 is wound widely around the outer periphery of the low-voltage coil 2, and a high-voltage coil 3 is divided into three winding sections 3a, 3b, and 3c having approximately equal numbers of turns. 3
c is sequentially connected to the core through the insulating layer S! (The low voltage coil 2) is wound in a concentrically laminated state. A rectifier diode 4 is connected in series between each winding section 3a to 3C of the high voltage coil 3 and on the output side of the final winding section 3C.
a, 4b, and 4c are connected, and a high voltage output is obtained from the output end of the rectifier diode 4C. Here, among the winding sections 3a to 3C constituting the high voltage coil 3, the starting end side,
The winding section 3a wound on the innermost circumference adjacent to the low voltage coil 2 is provided with a ringing removing means 6 comprising a ringing removing coil 5 having a smaller number of turns than the number of turns of the winding section 3a; A capacitor 7 connected in series to the ground side of the ringing removal coil 5 of the ringing removal means 6 is connected in parallel. The ringing removing coil 5 of the ringing removing means 6 is wound around the core l on the inner periphery of the winding section 3a and sandwiched between the winding section 3a and the primary coil 2. .

At this time, the capacitor 7 connected in series to the ground side of the ringing removal coil 5 is connected to the core 1. Low voltage coil 2. It is provided either integrally (built-in) with the high-voltage coil 3 or the like, or arranged separately (externally attached).

In the high voltage generator having such a configuration, the number of turns of each layer (winding sections 3a to 3c) of the high voltage coil 3 is approximately equal, and
Each winding section 3a to 3C of the high-voltage coil 3 is stacked on the low-voltage coil 2 wound around the core l, and is sequentially laminated and wound concentrically around the core l. The bond is extremely good and there is no AO between each layer.
Since there is no potential, a loop for causing ringing is not formed between each winding section 3a to 3C. Further, between the winding section 3a on the starting end side of the high voltage coil 3 and the low voltage coil 2, a ringing removing coil 5 having a smaller number of turns than the winding section 3a is connected in parallel to the winding section 3a as a ringing removing means 6. By arranging the windings and connecting the capacitor 7 in series with the ringing removal coil 5, the ringing generated between the low voltage coil 2 and the winding section 3a and the ringing removal coil 5 is removed by the ringing removal coil of the winding section 3a. Number of turns greater than 5 and capacitor 7
The manual input of an O parallel circuit (one turbidance is matched with the impedance of the ringing source formed by the coil and high-voltage coil, the cage inductance, the distributed capacitance of the high-voltage coil, etc.) to efficiently generate ringing. The ringing is removed by damping the ringing energy and consuming the ringing energy more than the direct current resistance component of the ringing removal coil 5.Here, the number of turns T1 of the winding section 3a is set to 625 turns (constant), and the ringing The number of turns of the removal coil was decreased from 585 turns to 50 turns (
When the difference in the number of turns is gradually increased from 40 turns), the basic pulse Vp-p (v) across the capacitor 7, the optimum value of the capacitor +7: I7 capacitor capacity tOs (p F ), the optimum resistance value of the resistor 8 Experimental values for Rs (K, Ω~) are shown in Table 1. (The distance between the winding section 3a and the ringing removal coil 5 is set to 0°5 mm.) From Table 1, it can be seen that when the difference in the number of turns is in the range of 40 turns to 80 turns, the capacitor with low withstand voltage and the resistance are It can be seen that ringing can be effectively removed even when the circuit is constructed using a resistor that is not required at all or has a low wattage (resistance value).

Similarly, in one embodiment of the high voltage generator of the present invention, the high voltage coil is divided into three winding sections having approximately the same number of turns, and a rectifier diode is connected between each winding section and on the output side of the final winding section. As mentioned above regarding the components, the number of divisions of the high voltage coil is not limited to the embodiment, and can be increased or decreased as necessary.In this case, the DC resistance component of the ringing removal means increases and the Minute ringing is effective in energy consumption. Furthermore, the connection positional relationship between the high voltage coil and the rectifier diode, and the connection positional relationship between the ringing removal coil and the ringing removal coil are not limited to the embodiments. For example, as shown in FIG. A rectifier diode l)+ is placed on the output side with the winding section 3a in between.
D2 may be connected, and in this case, the ringing removal coil 5 is connected in parallel to the winding section 3a, which is not limited to the winding section on the start end side, and near the middle where the AO=O point exists. By connecting a capacitor 7 (a resistor in series with the capacitor 7 as necessary) to the divided portion, ringing is removed.As shown in FIG. Even if the rectifier diode D3 is connected to the input side of the winding section 3a forming the termination side (without connecting the rectifier diode to the high voltage output side (grounded through the large distributed capacitance inherent to the CRT)),
In this case, the ringing loop passes through the high voltage end of the high voltage coil 3 (winding section 3a), the point A'c = o exists at the high voltage end of the high voltage coil 3 (winding section 3a),
Therefore, ringing is removed by connecting a capacitor 7 (with a resistor in series with the capacitor 7 if necessary) to the high voltage end of the ringing removing coil 5 connected in parallel to the winding section 3a.

As described above, according to the high voltage generator of the present invention, the high voltage generator includes a core, a low voltage coil wound on the core, and at least one winding section coaxially wound on the low voltage coil. A high-voltage generator comprising a coil, a ringing removal means comprising a ringing removal coil having at least a smaller number of turns than the winding section in a winding section of the high-voltage coil;
The ringing removing coil of the ringing removing means is wound in series between the coils connected to the ringing removing coil. By matching the input impedance of the 0 parallel circuit with the ringing generation source formed by the leakage inductance of the high voltage coil, the leakage inductance of the high voltage coil, and the distributed capacitance of the high voltage coil,
By efficiently damping ringing and consuming the ringing energy by the DC resistance component of the ringing removal coil, stable high voltage output characteristics can be obtained at all times, and there is no risk of bright and dark vertical stripes appearing on the screen.
It is possible to obtain good image quality characteristics. He's talented.
By matching the input impedances, a capacitor with a low withstand voltage or a resistor with a low voltage can be used, and ringing can be efficiently removed. Furthermore, by connecting a capacitor to the ringing removal coil side, there is almost no fundamental pulse loss and almost no power loss.

What's even better is that the ringing energy is consumed by the entire ringing removal coil, so there is no risk of abnormal heat generation on the circuit, and it is very safe. As described above, according to the high voltage generation electrical manufacturing method of the present invention, it is possible to obtain good and stable image quality characteristics with an extremely simple configuration.
Especially when applied to high-performance flyback transformers, the effect is remarkable.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view of an embodiment of the high pressure generator of the present invention;
FIG. 2 is a circuit diagram of the same structure, and FIGS. 3 and 4 are circuit diagrams of other embodiments of the high voltage generator of the present invention. DESCRIPTION OF SYMBOLS 1... Core, 2... Low voltage coil, 3... High voltage coil, 3a, 3b, 3c... High voltage coil winding division, 5...
... Ringing removal coil, 6... Ringing removal means, 7... Capacitor, Patent applicant: Electric Acoustic Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] A high voltage generator comprising a core, a low voltage coil wound on the core, and a high voltage coil consisting of at least one winding section coaxially wound on the low voltage coil,
Connecting in parallel to a winding section of the high-voltage coil a ringing removing means comprising a ringing removing coil having at least a smaller number of turns than the winding section, and a capacitor connected in series to the ringing removing coil of the ringing removing means, A high-voltage generator characterized in that the ringing removal coil is wound between a winding section of the high-voltage coil and a low-voltage coil.