DE1070673B - Circuit arrangement for remote control of a television receiver - Google Patents

Description

The invention relates to a circuit arrangement for remote control of at least one function a television receiver connected to a supply network.

Such circuit arrangements can be found, among other things, in so-called universal receivers (all-current devices) Use in which not only the filaments of the various tubes are connected in series and .so directly connected to the grid, but also the rectifier circuits for generation the required supply voltages without using a supply transformer from the network. There is one end of the series-connected filaments and one side the rectifier circuit is connected to the chassis.

Usually two conductors of the supply network are led to a socket, one of which is earthed is connected and the other conductor has a relatively high potential to earth.

If now the plug of the connection line that is to connect the receiver to the network, so in the socket is plugged in so that the ungrounded conductor is connected to the chassis, it follows also on this chassis. a relatively high potential against earth.

Because a DC voltage has to be regulated with remote control, one wire in the line is the leads from the receiver to the remote control element, directly connected to the chassis.

If the chassis is at the above-mentioned high potential, it is when due to wear the insulation of the line has become damaged, the human body touching it Lead dangerous.

The circuit arrangement according to the invention overcomes this disadvantage and is characterized in that a control loop is provided for each control function, which consists of one between an auxiliary AC voltage source and a coupling arrangement lying over the receiver chassis and a coupling arrangement above the coupling arrangement and a connecting line connected, remotely arranged control element consists of the the auxiliary AC voltage, the frequency of which is high compared to the mains frequency, is supplied, while the mains voltage, which may be on the chassis, almost does not pass through the coupling arrangement can, and that a rectifier circuit is also connected to the coupling arrangement in this way is that a part of the auxiliary AC voltage that can be adjusted by the control element is rectified -and is used as a control voltage.

Some possible embodiments are shown below with reference to those shown in the drawing Figures described.

Circuit arrangement
for remote control of a television receiver

Applicant:

NV Philips' Gloeilampenfabrieken,
Eindhoven (Netherlands)

Representative: Dipl.-Ing. K. Lengner, patent attorney,
Hamburg 1, Mönckebergstr. 7th

Claimed priority:
Netherlands 11 May and 17 June 1957

Peter Johannes Hubertus Janssen,

Eindhoven (Netherlands),
has been named as the inventor

² '■■

Here represents

Fig. 1 shows a first embodiment and

Fig. 2 shows a second embodiment.

In Fig. 1 the bloak 1 represents a television receiver and the block 2 a first auxiliary arrangement, preferably in a special housing, which in this embodiment is used for remote control of the brightness and can be turned directly mounted on the receiver. Furthermore, 12 denotes the line that connects this arrangement to a remotely located second auxiliary arrangement. This second arrangement is represented by iden block 3 and contains the changeable element by means of which the Brightness is adjustable. .

In Fig. 1 only one control circuit is shown. . It should be understood, however, that a similar circuit can be provided for each function of the receiver that is to be controlled. The number of elements in receiver 1 and in arrangements 2 and 3 and <the connections between 1, 2 and 3 only needs to be expanded to the required number:

The mode of operation of the control loop is as follows: An alternating voltage V _{t is} fed to the line 13, with a frequency / _; , which must be high in comparison to the mains frequency, which latter is 50 Hz, for example, and can even be zero (direct current). This voltage V ₁ can be taken from the line output circuit, for example, whereby / _; the

909 688/174

Line deflection frequency becomes the same. This tension should ^ι in a manner similar to that described above,

The volume, the contrast, the image and the electrical induction can be as sinusoidal as possible

the line 12 to the input circuits of the receiving line synchronization and possibly others

to prevent gers. This alternating voltage can be regulated during functions of the receiver. if

For example, an excessive number of functions are not taken from the series capacitor

the one that is in the savings circle of the line deflection circuit, a capacitor 9 is sufficient

And via the capacitor 6, the line 12, these functions are too large, for example more than

open (shown switch 16, the changeable three, more capacitors 9 must also be provided.

Resistor 10 and capacitor 9 will be seen to the chassis, because otherwise the voltage drop across the

out, which is denoted by 15 in the figure. The io sem capacitor is too large.

Capacitors 6 and 9, which are provided with a breakdown dielectric between the pads. tion dst shown schematically in FIG. Here it is necessary to have omitted a relatively small capacitor 9 and by a capacitance value which is to be dimensioned so that the. Replaced isolating transformer 17, whose primary winding impedance of these capacitors for the mains frequency 15 is on the one hand with point 14 and on the other hand with large, while it is considerably connected to chassis 15 at each frequency f _t. The secondary winding is smaller. If the plug of the universal is now connected to the line 12, the receiver in turn is plugged into the socket in such a way that it is isolated from the chassis, so that your possible non-grounded conductor of a DC voltage or touch is not life-threatening '. The regulation of the alternating voltage network connected to the chassis 20 remains the same, because the resistance is variable, so the high potential to earth is applied to the chassis. <10 thought transformed after the primary winding If one now touches the line 12 on the one hand, while the main part of the mains voltage can be changed where the auxiliary AC voltage, which is on the other hand in contact with earth, is fed to the rectifier circuit at the capacitor 9, an advantage of this second embodiment, as opposed to the fact that the contact of the line 12 is no longer 25 above the former, is that because the wind is dangerous. If the grid frequency is 0 Hz, ^r "dung number Befeundänseitig considerably smaller than the And. E., If it is to one! DC power Han number of primary turns is measured, the tension Delt, the total voltage across the capacitor 9 voltage is transformed down will so the electrical

The (voltage F, - is largely due to the condensation induction of the line 12 on the input circuits of the sator6 and the resistor 10 distributed, so that the 30 receiver is significantly reduced. When out of tension at point 14 with the switch 16 'closed, a metal shield 18 is provided which by changing the resistor 10, the secondary winding can be changed electrically against the primary. This voltage is shielded by the capacitor 7 winding, so the eventual impact fed to the rectifier 8, which together with the one line wire to the input circuits Resistor 5 and the capacitor 7 counteract this alternation 35 the action of the other wire, voltage rectifies. The rectified negative>? ■■■> This can also be achieved by adding a mean voltage to the normally effective tap on the secondary winding of the transformer HelHigikeitsoperations voltage that the tap 17 connects to the chassis 15 via a capacitor Resistance 11 is removed, after which it is tied.

S'Ummensspannung via the resistor 4 to the control 40 Depending on whether a negative or a positive grid is fed to the cathode ray tube. If a rectified voltage is required here, the rectifier 8, assumed in this exemplary embodiment, can be attached in the position shown or vice versa to the cathode of the cathode ray tube. In all cases where it is useful, potential and to the control grid by means of the switch 16 is provided, for example tapping on resistor 11 an approximately lower 45 for volume control, because a complete sub-potential is applied. The resistor 11 is on the one hand ^{: it} may be desirable to press the sound reproduction in certain cases with a direct voltage source (not shown).

which supplies a supply voltage + F ₆ , and on the other hand it should be noted that the control voltage obtained is always connected to the chassis. By changing the resistor 10 in series with the resistor 10 that is already active in the receiver ^: Now the rectified 50 voltages are supplied. To regulate the negative voltage change ¹ , so that the control grid ■ '■■ strength z. B. it is made in series with the voltage for more or less negative against the cathode the automatic gain control of the sound part can turn, whereby the beam current of the cathode is made effective and can be regulated in the case of a contrast beam tube. - regulation in series with the video modulation voltage.

In this way it is possible to change the brightness of the picture as desired during the 55 Finally it should be mentioned that even for non-reception. univer.salempf anger such a switching device ^: The switch 16 is · provided so that you can be important when. It can e.g. B. the case that for some reason the brightness is suddenly grounded to the chassis of the receiver, while the whole way back 'wants to, the rectifier 8 on a line 12 is at a high potential. Even in times of the highest possible alternating voltage supply 60 in this case, touching the line can be life by opening the switch 16. Which then be dangerous; the circuit arrangement after the occurring maximum negative voltage at the resistor invention eliminates this risk.

Stand 5 must suffice to keep the beam current under all The execution can be very simple. At the reception

^: To suppress circumstances. catcher winds a / socket outlet to produce the

One possible dimensioning of the elements is as follows: 65 connection with the auxiliary assembly 2 provided. Just

Capacitor 6 '200 oF this socket, connection 13 and each control circuit

'' ■ _ ·· "-" _ "A resistor 5 with its connections and the

'capacitor 7, ...> Zü pt _{gchluß mh each chassis must be} at each receiver

Condenser 9. 5000 pF can also be applied ·; the remaining parts, d. H.

Resistance 10. '..! ..; ^:: _..; ....... 2OkQ 70 the auxiliary connections 2, 3, the connector, the condensate

transformers, switches, rectifiers, The changeable resistors and the line are at the expense of the person who calibrates these remote control boxes acquires.

Claims (14)

5 claims: 1. Circuit arrangement for remote control of at least one function of a television receiver connected to a feed network, characterized in that a control circuit is provided for each control function, which consists of a coupling arrangement (2) located between an auxiliary AC voltage source (Vi) and the receiver chassis (15) and there is a remote control element (3) connected via the coupling arrangement and a connecting line (12), to which the auxiliary AC voltage, the frequency of which is high compared to the mains frequency, is fed, while the mains voltage which may be on the chassis (15) controls the coupling arrangement ( 2) can almost not happen, and that a rectifier circuit (8) is connected to the coupling arrangement in such a way that a partial amount of the auxiliary AC voltage adjustable by the control element (3) is rectified and used as the control voltage. 2. Circuit arrangement naoh claim 1, characterized in that the control element (3) via the line (12) on the one hand via a first protective capacitor (9) to the chassis (15) of the receiver and on the other hand via a second protective capacitor (6) to the auxiliary AC voltage source (Vf) is connected, the rectifier circuit (8) between the connection point of the second protective capacitor (6) with the associated wire of the line (12) leading to the control element (3) and a connection (11) of the DC voltage source (+ F ₀ ) is switched for the organ belonging to the function to be controlled. 3. Circuit arrangement according to claim 1, characterized in that the control element (3) is connected via the line (12) to the secondary winding of an isolating transformer (17), the primary winding of which on the one hand via a capacitor (6) to the auxiliary AC voltage source (VJ and on the other hand with the chassis (15) of the receiver is connected, while the rectifier circuit (8) between the connection point of the capacitor (6) with the primary winding of the transformer (17) and a connection (11) of the DC voltage source (+ F ₆ ) provided in the receiver for the Organ is switched that belongs to the function to be regulated. 4. Circuit arrangement according to claim 3, characterized characterized in that the number of secondary turns of the isolating transformer (17) is considerable is less than the number of primary turns. 5. Circuit arrangement according to claim 3 and 4, characterized in that between the primary and a metal shield (18) is attached to the secondary winding of the isolating transformer (17) is such that the 'secondary winding is electrically shielded from the primary winding. 6. Circuit arrangement according to claim 3 and 4, characterized in that a center tap of the secondary winding of the isolating transformer (17) is connected to the chassis (15) of the receiver via a capacitor. 7. Circuit arrangement according to one of the preceding claims, characterized in that the rectifier circuit from a rectifier. (8), a resistor (5) and a capacitor (7) exists. 8. Circuit arrangement according to one of the preceding Claims, characterized (characterized in that the different parts of the control loop in one first (2) and in a second (3) auxiliary sanordnung are housed, which are interconnected by multi-core Lines are connected, the first arrangement (2) directly at the receiver (1) may be appropriate. 9. Circuit arrangement according to one of the preceding claims, characterized in that in the receiver (1) a socket with connections and the necessary for the rectifier circuits additional resistances in the first auxiliary assembly to be attached to the receiver (2) the connector, the isolating capacitors or transformers, the rectifiers and the associated ones Capacitors and the control elements to be operated in the second auxiliary arrangement (3) are housed. 10. Circuit arrangement according to one of the preceding claims, characterized in that the auxiliary AC voltage is as sinusoidal as possible and a suitably selected point in the output stage taken from the horizontal deflection circuit. ■ 11. Circuit arrangement according to one of the preceding claims / characterized in that the frequency of the auxiliary AC voltage is equal to that of the horizontal deflection current. 12. Circuit arrangement according to claim 2, characterized in that any current is less than 1 mA due to the sum of all protective capacitors. 13. Circuit arrangement according to one of the preceding claims, characterized in that the rectified voltage - always in series with the voltage already effective in the receiver supplied to the organ belonging to the function to be regulated. 14. Circuit arrangement according to one of the preceding claims, characterized in that in series with at least one of the controllable elements (10) a switch (16) in the second. Auxiliary assembly (3) is attached. 1 sheet of drawings © 909 688/174 12.59