EP0214257A1 - Deflection network concept for television sets - Google Patents
Deflection network concept for television setsInfo
- Publication number
- EP0214257A1 EP0214257A1 EP86901856A EP86901856A EP0214257A1 EP 0214257 A1 EP0214257 A1 EP 0214257A1 EP 86901856 A EP86901856 A EP 86901856A EP 86901856 A EP86901856 A EP 86901856A EP 0214257 A1 EP0214257 A1 EP 0214257A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- network
- deflection
- power supply
- circuit
- line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
- H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
- H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
- H04N3/18—Generation of supply voltages, in combination with electron beam deflecting
- H04N3/185—Maintaining dc voltage constant
Definitions
- the invention is based on a deflection power supply concept for television sets, in which the various operating voltages for the television receiver are generated from the line transformer and the losses of the horizontal deflection circuit during the line flyback and part of the first half of the forward run are compensated for by a switching power supply which uses periodic energy Closing an electronic switch in series with the primary winding of a transformer and the magnetic energy stored in the primary winding is then transferred to the primary inductance of the line transformer during the open phase of the electronic switch, the parallel to the same electronic switch via a isolating diode Primary winding of the line transformer of the television receiver is connected, to which the horizontal deflection winding is connected, the positive deflection flowing through the deflection winding str ⁇ m flows through the same electronic switch and the negative deflection current flows through a diode connected in parallel with the deflection winding and the generated operating voltages are stabilized in the event of mains voltage fluctuations in that the leading phase of the electronic switch is pulse-width modulated by a control circuit, so that at
- the demand for a separation of the television sets has only arisen in recent years; because these devices are increasingly being used as monitors, for example for playing video recordings, for connecting to video game devices, as output devices for home computers. Disconnection from the mains is also an essential requirement for connecting headphones. Since the connections for such peripheral devices relate exclusively to the signal-processing parts of the television set, complete disconnection from the mains is not necessary, so that it is sufficient if only these parts of the device are disconnected from the mains.
- the invention is based on the task of ensuring a grid separation using the cost-effective concept of the circuit constructed according to the preamble of the patent claim. This object is achieved by the invention specified in the patent claim.
- the invention has the advantage that no expensive additional components are required.
- Figure 1 shows a first arrangement for implementing the invention
- Figure 2 shows a variant of Figure 1 with integrated circuits.
- An operating voltage U0 rectified from the AC voltage source 1 is connected via an inductor 2 to a switch 3 which is periodically opened and closed by a driver circuit 4 at the line frequency.
- the switch 3 is used to generate the operating voltages U1 to Un for the television receiver and to generate the deflection current through the line deflection winding 5.
- This circuit is described in detail in DE-PS 21 30 902.
- the magnetic energy stored in the inductor 2 at the time the switch 3 is switched off is transmitted via a winding 6 and via a diode 7 into a winding 8 of the line transformer 9. From this, the various on the secondary side of the line transformer 9. Tensioner.
- U1 to Un are generated, such as the operating voltages for the various signal processing stages and the high voltage, Focus voltage, screen grid voltage, the stand-by voltage and the supply voltage for the sound part.
- a winding 10 is also provided, which can be used to extract energy from a switched vertical stage.
- the control for switch 3 is removed on the secondary side and via a mains isolating coupling element, e.g. a small pulse transformer 12 is transmitted to the primary side.
- a mains isolating coupling element e.g. a small pulse transformer 12 is transmitted to the primary side.
- an optocoupler can also be used. Because the control of the switch 3 is isolated from the mains, the masses on the mains-connected and the mains-separated side are no longer galvanically connected. While the horizontal deflection winding is connected to the network, the vertical deflection circuit is network separated. The network separation therefore also runs through the deflection unit.
- the line separation is symbolically indicated by line 15.
- the control circuit 11 is also arranged on the network side and is controlled by a line oscillator located on the network-separated side via a network-separating coupling element 12. If the actual value of the control is taken from the network-separated side and the control circuit is also arranged there, the control information for controlling the driver circuit 4 must take place via the network-separating coupling element 12 in the form of pulse-width-modulated signals.
- the network separating coupling element 12 is shown in the figure as a transformer.
- a protective circuit 13 is also arranged on the network side, which provides information tapped at a sensing element 14 Overloading the switching power supply receives and the driver circuit 4 is put out of operation.
- the circuit shown in FIG. 2 represents an optimized solution that works with two integrated circuits (21, 22).
- the following functions are arranged on the network-connected side:
- Start-up circuit 16 for starting the circuit with pulses of increasing width, control 11 by pulse width modulation, driver circuit 4 for actuating switch 3 and the protective circuit 13.
- This concept has the advantage of precise control because the actual value can be obtained directly from the system voltage U syst .
- the protective circuit is simple and safe because the charging and discharging current is only queried in relation to a single ground point. This ground point is also the reference point of the regulated actual value.
- the pulse transmitter 12 can have a small dimension since only a wide pulse signal is transmitted without control information.
- the standby transformer 21 can also be small.
- the receiver is switched on by applying the operating voltage to the H oscillator 17 with output stage 20.
- the switch-on process can be done with the help a microprocessor via a remote control.
- Control circuit 11 controls the pulse width control.
- the dividing line of the device runs in such a way that the primary power supply, the horizontal deflection circuit with horizontal deflection winding, the horizontal driver circuit with voltage supply is on the side connected to the mains, while all signal-processing parts of the device, the high-voltage supply connected with the Line transformer connected supply voltage rails, the vertical deflection circuit with vertical deflection winding, the line oscillator are arranged with the synchronization circuit.
- the standby transformer, the diode split line transformer and an isolating transformer or an optocoupler for the transmission of the control signals from the secondary side to the primary side serve as network isolating coupling links between the two sides.
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Details Of Television Scanning (AREA)
- Dc-Dc Converters (AREA)
- Television Receiver Circuits (AREA)
Abstract
Le concept ci-décrit fonctionne sur le principe de Wessel. Le circuit de balayage horizontal comportant le bobinage de balayage, le circuit excitateur, les inductances de mémoire correspondent au côté relié avec le réseau, tandis que les bobinages permettent de produire les hautes tensions et les tensions de fonctionnent ainsi que l'oscillateur horizontal avec le comparateur de phase et les bobines de balayage vertical avec leurs circuits d'excitation sont séparés du réseau. Les informations permettant la régulation de l'alimentation électrique de commutation disposée sur le côté relié au réseau sont prélevées sur un circuit de régulation séparé du réseau et transmises via un circuit de couplage permettant la séparation du réseau.The concept described here works on the Wessel principle. The horizontal scanning circuit comprising the scanning winding, the exciter circuit, the memory inductors correspond to the side connected with the network, while the windings make it possible to produce the high voltages and the operating voltages as well as the horizontal oscillator with the phase comparator and vertical scanning coils with their excitation circuits are separated from the network. The information allowing the regulation of the switching power supply arranged on the side connected to the network is taken from a regulation circuit separate from the network and transmitted via a coupling circuit allowing the separation of the network.
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19853508267 DE3508267A1 (en) | 1985-03-08 | 1985-03-08 | DEFLECTION POWER SUPPLY CONCEPT FOR TELEVISION EQUIPMENT |
DE3508267 | 1985-03-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0214257A1 true EP0214257A1 (en) | 1987-03-18 |
Family
ID=6264599
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86901856A Ceased EP0214257A1 (en) | 1985-03-08 | 1986-03-08 | Deflection network concept for television sets |
Country Status (5)
Country | Link |
---|---|
US (1) | US4727464A (en) |
EP (1) | EP0214257A1 (en) |
JP (1) | JPS62502015A (en) |
DE (1) | DE3508267A1 (en) |
WO (1) | WO1986005345A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3707915A1 (en) * | 1987-03-12 | 1988-09-22 | Thomson Brandt Gmbh | TELEVISION RECEIVER WITH A DISCONNECTED CONTROLLER |
US4823248A (en) * | 1987-04-07 | 1989-04-18 | Murata Manufacturing Co., Ltd. | High voltage generator |
DE3731645A1 (en) * | 1987-09-19 | 1989-03-30 | Thomson Brandt Gmbh | SWITCHING POWER SUPPLY |
DE3733010A1 (en) * | 1987-09-30 | 1989-04-13 | Thomson Brandt Gmbh | STAND-BY - SWITCHING IN CONNECTION WITH CLOCKED VERTICAL AMPLIFIER |
DE3844210A1 (en) * | 1988-12-29 | 1990-07-05 | Electronic Werke Deutschland | Switched-mode power supply having overload protection |
DE4005168C2 (en) * | 1990-02-17 | 1993-09-30 | Jungheinrich Ag | Converter for higher frequencies |
JPH04957A (en) * | 1990-04-18 | 1992-01-06 | Sharp Corp | Facsimile equipment |
DE4117891A1 (en) * | 1991-05-31 | 1992-12-03 | Thomson Brandt Gmbh | Switching network adaptor for TV receiver or video recorder - has capacitor second electrode coupled to current source in integrated circuit |
DE19912627A1 (en) * | 1999-03-20 | 2000-09-28 | Thomson Brandt Gmbh | Circuit for stabilizing a high voltage |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NO123469B (en) * | 1970-06-23 | 1971-11-22 | Jan Wessels Radiofabrikk Radio | |
DE2313961C2 (en) * | 1973-03-21 | 1975-05-07 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Line deflection circuitry for cathode ray tubes |
GB1481518A (en) * | 1973-10-23 | 1977-08-03 | Rca Corp | Power supply and line deflection circuit for television receivers |
FR2294600A1 (en) * | 1974-12-13 | 1976-07-09 | Blaupunkt Werke Gmbh | TV receiver with safe connections to supplementary apparatus - has system of transformers used for isolating HV from apparatus (SW120776) |
DE2525122C3 (en) * | 1975-06-05 | 1981-11-26 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | Feed circuit for a thyristor horizontal deflection stage of a television receiver |
US3947632A (en) * | 1975-07-23 | 1976-03-30 | Rca Corporation | Start-up power supply for a television receiver |
GB1551013A (en) * | 1975-11-07 | 1979-08-22 | Rca Corp | Power supply arrangement with minimum interaction between plural loads |
DE2606351A1 (en) * | 1976-02-18 | 1977-08-25 | Loewe Opta Gmbh | Mains-isolated chassis for TV receiver - has mains supply and horizontal deflection generator as single unit independent of chassis |
JPS6031297B2 (en) * | 1977-04-18 | 1985-07-22 | 株式会社日立製作所 | High pressure protection device |
US4176304A (en) * | 1978-05-09 | 1979-11-27 | Rca Corporation | Regulating television horizontal deflection arrangement |
US4188568A (en) * | 1978-08-14 | 1980-02-12 | Gte Sylvania Incorporated | Power saving circuit |
US4321514A (en) * | 1980-11-07 | 1982-03-23 | Rca Corporation | Commutated SCR regulator for a horizontal deflection circuit |
US4398133A (en) * | 1981-01-26 | 1983-08-09 | Zenith Radio Corporation | High frequency computer terminal power supply with isolation |
FR2519485A1 (en) * | 1981-12-31 | 1983-07-08 | Thomson Brandt | CUTTING REGULATED SUPPLY DEVICE, IN PARTICULAR FOR A DISPLAY APPARATUS AND APPARATUS HAVING THE SAME |
DE3210908C2 (en) * | 1982-03-25 | 1984-05-30 | Grundig E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig & Co KG, 8510 Fürth | Synchronized switched-mode power supply with mains-separated horizontal output stage circuit in television receivers |
DE3227152C2 (en) * | 1982-07-21 | 1984-09-06 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | Converter power supply with mains isolation for televisions |
EP0131703B1 (en) * | 1983-06-01 | 1987-09-30 | TELEFUNKEN Fernseh und Rundfunk GmbH | Switched-mode power supply for a device with stand-by operation, especially for a television receiver |
JPS604628A (en) * | 1983-06-23 | 1985-01-11 | Daikin Mfg Co Ltd | Thin type damper disc |
GB8334372D0 (en) * | 1983-12-23 | 1984-02-01 | Gen Electric Co Plc | Dc-dc converter |
-
1985
- 1985-03-08 DE DE19853508267 patent/DE3508267A1/en not_active Withdrawn
-
1986
- 1986-03-08 WO PCT/EP1986/000128 patent/WO1986005345A1/en not_active Application Discontinuation
- 1986-03-08 EP EP86901856A patent/EP0214257A1/en not_active Ceased
- 1986-03-08 JP JP61501684A patent/JPS62502015A/en active Pending
- 1986-03-08 US US06/945,612 patent/US4727464A/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO8605345A1 * |
Also Published As
Publication number | Publication date |
---|---|
US4727464A (en) | 1988-02-23 |
DE3508267A1 (en) | 1986-09-11 |
JPS62502015A (en) | 1987-08-06 |
WO1986005345A1 (en) | 1986-09-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19861008 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
|
17Q | First examination report despatched |
Effective date: 19881202 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED |
|
18R | Application refused |
Effective date: 19890731 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: MAI, UDO Inventor name: HARTMANN, UWE |