JPS6031241Y2 - Horizontal output circuit device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a horizontal output circuit device for a circuit that performs a switching operation.

In circuits that perform switching operations, rapid changes in current generate harmonics, and these high frequencies can mix into other circuits and cause various types of interference.

For example, in the horizontal output circuit of a conventional television receiver as shown in Figure 1, the output run sister TR and the damper diode D both perform a switching operation, causing a sawtooth discharge current to flow through the deflection coil LH. .

At this time, the sudden change in current generates harmonics, which enter the detection circuit and disturb the synchronization pulse, causing instability in horizontal synchronization.

This appears as a black vertical line on the left edge of the screen, making the image difficult to see.

To explain this phenomenon in more detail, a rapidly changing current containing the aforementioned harmonics flows through the emitter E1 base B of the output run sister TR, and this current causes magnetic flux to flow around the respective lead ends E and B. As a result, electromagnetic waves are generated.

This electromagnetic wave is received by the antenna of the television receiver and causes harmonic interference as described above.

Therefore, such disturbances can be prevented by dampening the rapidly changing current flow containing high frequencies and attenuating the magnetic field generated thereby.

Based on this idea, as shown in Figure 2, a 2t capacitor C3 was conventionally inserted between terminals B and E and between terminals E and C of the output run sister sum.

However, such capacitors have lead wires with a certain finite wire length, and because these lead wires create a kind of antenna effect, some of the electromagnetic waves generated by the transistor are radiated from these lead wires, and are emitted by the television receiver. It could enter the antenna and cause harmonic interference.

It is therefore an object of the present invention to provide a horizontal output circuit arrangement having a harmonic prevention device made from a simple and inexpensive magnetic shielding material, such as a ferrite core, for eliminating the harmonic antenna effects due to the aforementioned capacitor leads. There is a particular thing.

The above-mentioned purpose is based on the features of the present invention, and is a horizontal output circuit in which a lead wire of a capacitor for high frequency prevention is connected between the electrodes of an output run sister of a horizontal output circuit, and a magnetic ferrite core is disposed to cover this lead wire. By providing the device, it becomes a distant relative.

Specific examples of the present invention will be described below with reference to the drawings.

Referring to FIG. 3, embodiment 1 of the present invention is shown as a ferrite core member 3 having two holes formed therein for passing the lead wires of a capacitor.

If this ferrite core member 3 is fitted to the lead wire of capacitor=2 as shown in FIG. 4 and connected to the positions of harmonic prevention capacitors C2 and C3 in FIG. Due to the magnetic resistance, the magnetic flux around the lead wire of the capacitor 2 is attenuated while passing through the ferrite core member 3, and electromagnetic waves due to the interaction between the electric field and the magnetic field are absorbed.

In this way, by attaching a simple and inexpensive ferrite core member to a capacitor, the above-mentioned antenna effect of the capacitor lead wire can be prevented, greatly increasing the harmonic prevention ability and completely eliminating interference caused by harmonics. It becomes possible to prevent this.

It should be noted that it must be understood that the shape of this ferrite core member is not particularly limited to the illustrated example.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram of the horizontal output circuit. Figure 2 is a circuit diagram of a horizontal output circuit incorporating a harmonic prevention capacitor. FIG. 3 is a schematic diagram showing a specific example of the present invention. FIG. 4 is a schematic diagram showing a specific example of the present invention in use. L)! ... Deflection coil, C1 ... Resonance capacitance, C2, C. ...Harmonic prevention capacitor, D...
・Damper diode, Tr...output run sister, ECC...supply voltage.

Claims (1)

[Scope of utility model registration request] A horizontal output circuit device characterized in that a high frequency prevention capacitor is connected between the electrodes of an output run sister of a horizontal output circuit, and a magnetic ferrite core is fitted to cover the lead wire of the capacitor.