JPS5851671A - High voltage stabilizing circuit - Google Patents

Abstract

PURPOSE:To stabilize even a comparatively unstable high voltage generating source with a simple means, by connecting a discharge element always possible for discharge in parallel between an anode and ground of a picture tube, in supplying a high voltage to the picture tube. CONSTITUTION:A high voltage is supplied to an anode terminal 4 of a picture tube 5 from an output terminal 3 of a high voltage generating source 15. Although the high voltage generated from the source 15 includes a fluctuating component, the voltage is stabilized to a discharge start voltage with a discharge element 16 always dischargeable and having a lower discharge start voltage than the high voltage. The source 15 has about 2 Mohms of output resistance, but a current limit resistor 17 can be inserted, as required. Thus, even for a high voltage generating source comparatively unstable, the stabilization can be done. Since the voltage can not increase extremely in this circuit, this circuit can also be used for an X-ray protection circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high voltage stabilizing circuit for a television receiver. Conventionally, in television receivers, one screen curves and one
Variations in screen size occurred, and to eliminate this, the regulation characteristics of the flyback transformer had to be improved or a high-voltage stabilization circuit had to be installed. Alternatively, a method has been adopted in which the capacitance formed between the internal conductive film and the external conductive film of the picture tube is increased.

However, there were limits to improving the regulation characteristics of the flyback transformer and increasing the capacitance of the picture tube, and the solutions to these problems were not satisfactory. Furthermore, a high voltage stabilizing circuit that detects high voltage fluctuations and protects the voltage by always keeping it at a constant value has the disadvantage that the circuit becomes extremely complex and the manufacturing cost increases. The present invention has been made in view of the above points, and it is an object of the present invention to provide a high voltage stabilizing circuit that is extremely inexpensive and can be easily installed.

Figure 1 shows a block diagram of a conventional high voltage stabilizing circuit.
A high voltage is supplied to the anode terminal (4) of. (6) is the ground of the picture tube, which is grounded at the same reference potential as the high voltage generator (1). The anode voltage generated by the high voltage generator +11 is not stabilized, but the resistors (7) and (8)
The variation is inputted to the inverting input terminal αυ of the error amplifier (9) via the error amplifier (9). Also - error amplifier t91.

The error from the reference constant voltage G (1) input to the non-inverting input terminal is amplified and output to the output terminal 3. As a result,
The high voltage generator +11 performs a high voltage stabilizing action by appropriately controlling the high voltage control terminal (3) to compensate for fluctuations in its output terminal (2).

However, in this case, a resistor (7) with a fairly high withstand voltage and a large shape is required.1. There will be disadvantages in assembling the television receiver. Furthermore, electrically, as shown in the detailed diagram in Figure @2, the waveform of fluctuations affected by the input volume I, etc. tends to become an integrated one, and its stabilizing effect is insufficient. there were.

Furthermore, the frequency response characteristics of the error amplifier (9) and the response characteristics of the control terminal (2) are still insufficient for practical use and cannot be said to be perfect. In addition, when the reference potential fluctuates, abnormally high voltage increases, which may cause X-ray leakage. Although it is possible to construct a stabilized power supply, its disadvantages include the large scale of its structure and design problems in terms of safety.

FIG. 3 is a block diagram of a high voltage stabilizing circuit showing an embodiment of the present invention, in which the high voltage generated from the high voltage source α9 includes fluctuations, but has a discharge starting voltage lower than that voltage. The discharge element cIe also includes a discharge element cIe having a configuration that does not generate ozone or the like. The high voltage source (5) has an output resistance of, for example, about 2 MΩ, but if necessary, a current limiting resistance surface may be inserted. Further, when accuracy of the high output voltage is required, the voltage value can be adjusted by appropriately changing the gap interval of the discharge element αe.

In this way, even relatively unstable high pressure sources can be stabilized by simple means. In addition, this high voltage stabilizing circuit never allows the high voltage to rise abnormally, and therefore has the great advantage that it can also be used as an X-ray protector circuit, which was sometimes required in the past. .

As described above, although this high voltage stabilizing circuit has a relatively simple configuration, it has great practical effects.

[Brief explanation of the drawing]

Figure 1 is a block diagram of a conventional high voltage stabilization circuit. @Figure 2 is a detailed diagram of the detection circuit of a conventional error amplifier. Figure @3 is a block diagram of a high voltage stabilizing circuit showing one embodiment of the present invention. Note that the same reference numerals in Figure 1 indicate the same control terminals, (4
)... Anode terminal, (5)... Picture tube, (6:...
...Earth of the picture tube (5), αe...discharge, element, frame...current limiting resistance. Agent Makoto Kuzuno - Figure 1 2 Figure 2 Figure 3 341

Claims (3)

[Claims] (1) A television receiver has a discharge element capable of discharging at all times, and an unstabilized high voltage generator having a voltage higher than the discharge starting voltage of the discharge element and an output impedance, and this high voltage When supplying between the anode and ground of the picture tube, there is always an (2) The high voltage stabilizing circuit according to claim 1, characterized in that a resistor is inserted in series with the discharge element in order to adjust the current flowing into the discharge element. (3) The high voltage stabilizing circuit according to claim 1, wherein the value of the stabilized high voltage can be changed by adjusting the discharge starting voltage of the discharge element.