JPS602706Y2 - television receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a negative voltage generator for a television receiver, particularly for use in biasing a small signal portion.

Conventionally, this type of low-voltage, low-current negative voltage power supply has been required, for example, for biasing field effect transistors used in tuner circuits, but it has had the disadvantage of causing a significant increase in cost when realizing it. .

That is, it was necessary to newly provide a dedicated winding or a dedicated tap to the power transformer or flyback transformer.

The present invention eliminates these drawbacks and provides a method that can achieve the objective simply by adding a rectifying element and a smoothing capacitor to a conventional television receiver.

An embodiment of this invention will be described in detail below with reference to the drawings.

In FIG. 1, numeral 1 denotes a switch that turns ON and OFF in horizontal periods, and is usually composed of a horizontal output transistor and a damper diode.

2 is a resonant capacitor, 3 is a horizontal deflection coil, 4 is a capacitor for cutting off direct current, and 5 is a horizontal winding of a vertical line distortion correction transformer, which is connected to a power source 7 via a flyback transformer 6.

The operation of the horizontal deflection circuit and the vertical distortion correction operation described above are widely known and are not the original intention of the present invention, so their explanation will be omitted. A horizontal pulse as shown in a appears.

Normally, if the power source 7 is about 110V, this horizontal pulse voltage will be approximately 800VO-p.

As shown in Figure 2, the voltage waveform appearing at the connection point between the capacitor 4 and the vertical distortion correction transformer 5 is obtained by dividing the above horizontal pulse by the inductance ratio of the deflection filter 3 and the horizontal winding 5 of the vertical distortion correction transformer. At the same time, a voltage with the DC component cut off appears.

The peak voltage of the negative part of this voltage is approximately −I
It will be QVo-p.

Therefore, as shown in FIG. 1, if a diode 8, which is a rectifying element, is connected to the connection point to rectify the voltage generated at both ends of the horizontal winding 5, and smoothed by a capacitor 9, a voltage of 11 is applied to the terminal C.
A DC voltage of 0V is generated and the purpose can be achieved.

As described above, according to the present invention, a small voltage negative power source can be obtained by adding rectifying and smoothing elements, which is extremely economical.

In addition, although the above embodiment describes the case where the voltage generated in the distortion correction transformer is used, for example, the voltage of both the width coil and the horizontal linearity correction coil, which are inserted in series with the horizontal deflection coil, can also be used. You can achieve the same effect by doing this.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing one embodiment of the present invention, and Fig. 2 is a circuit diagram showing an embodiment of the present invention.
FIG. 4 is a voltage waveform diagram of each part in the figure. In the figure, 1 is a horizontal switch, 3 is a horizontal deflection coil,
4 is a capacitor, 5 is a horizontal coil of a vertical line distortion correction transformer, 6 is a flyback transformer, 7 is a power supply, 8 is a diode, and 9 is a capacitor.

Claims (1)

[Scope of utility model registration request] A rectifying element is provided to rectify the voltage across an element having an inductance component inserted in series between one end of the horizontal deflection coil and the ground, and a minute voltage with the opposite polarity to the main power source is obtained from the output of this rectifying element. television receiver.