Abstract: The present disclosure describes systems and devices for gain slope equalization in a radio frequency (RF) amplifier (200). The RF amplifier (200) may include an input stage (210) for receiving an RF signal. In conjunction with the input stage (210), the RF amplifier (200) may incorporate an amplification stage (215) to amplify the RF signal. Coupled with the amplification stage (215) may be a transformer (220) including a first winding to receive the amplified RF signal, a second winding providing an RF output signal, and a resonator including a third winding that is coupled to the first and second windings. The resonator may be coupled to a circuit network which may be tuned to affect the resonance frequency and the gain slope of the RF output signal.

Abstract: Disclosed herein is a coil component that includes a winding core part and a wire wound around the winding core part. An i-th turn (i is an integer equal to or larger than 1) to a j-th turn (j is an integer equal to or larger than (i+2)) of the wire are wound in this order around the winding core part in an aligned state. A (j-th+1) turn of the wire is wound around a valley line formed by the i-th turn and a (i-th+1) turn. A (j-th+2) turn of the wire is wound adjacent to the j-th turn around the winding core part.

Abstract: An example controller for a flyback power converter includes a secondary-side circuit comprising a secondary-side controller. The secondary-side controller is configured to sense an electrical characteristic of a secondary-side output of the flyback power converter, select, based on the sensed electrical characteristic, a power mode, and transmit, over a communication channel, a control message specifying the selected power mode. A primary-side circuit of the controller includes a primary-side controller. The primary-side controller is configured to receive, over the communication channel, the control message specifying the selected power mode and control primary-side flyback drive circuitry of the primary-side circuit to drive a primary-side output of the flyback power converter according to the selected power mode so as to control a value of the electrical characteristic of the secondary-side output of the flyback power converter.

Abstract: LED systems with a multi-channel direct current power supply unit. The system has a first circuit in electrical communication with a first channel of the power supply and a second circuit in electrical communication with a second channel of the power supply. The power supply provides a constant current to the first and second circuits. The system has a third circuit in electrical communication with the ground of the power supply. A plurality of driverless luminaires are connected in series wherein each driverless luminaire has a first LED array electrically connected in series to the first circuit and a second LED array electrically connected in series to the second circuit and a driverless luminaire ground electrically connected to the third circuit.

Abstract: A lamp is provided that can have at least one interface on the lamp body for a selectable lumens and selectable correlated color temperature (CCT). In one embodiment, the lamp design includes a housing having a downlight geometry and a light engine including at least one string of light emitting diodes (LEDs), in which the light engine is position to emit light through a light emission end of the housing having the downlight geometry. The lamp also includes at least one first switch for selecting at least one lumen setting for the light emitted by the light engine; and at least one second switch for selecting at least one correlated color temperature. The first and second switch are mounted to the housing.

Abstract: In order to provide a transformer and an electric power converter which are less likely to become deteriorated with time and which have stable insulation performance, the transformer according to the present invention is provided with: a core; a bobbin in which a low-voltage-side primary winding and a high-voltage-side secondary winding are disposed along the central magnetic leg of the core; and a bobbin support part that supports the bobbin at an end of the bobbin on the primary winding side, such that an air gap is provided between the central magnetic leg of the core and a surface of the bobbin corresponding to the secondary winding.

Abstract: An LED driving circuit includes a transformer circuit, a voltage supply circuit, a voltage-stabilizing circuit and a ripple compensation circuit. The transformer circuit is configured to convert an input voltage into a ripple output voltage. The voltage supply circuit is configured to provide a driving voltage associated with the maximum value of the ripple output voltage. The voltage-stabilizing circuit is configured to provide a first pulse DC voltage associated with the variation of the ripple output voltage. The ripple compensation circuit is configured to provide a second pulse DC voltage associated with the value of the input voltage, provide a compensation voltage according to the first pulse DC voltage, the second pulse DC voltage and the driving voltage, and provide a pure DC output voltage by superposing the compensation voltage on the ripple output voltage.

Abstract: A power supply apparatus including a transformer, a first rectifier smoothing unit, a separation unit, a second rectifier smoothing unit, a resistor, and a rectifier unit. The first rectifier smoothing unit is configured to rectify and smooth an alternating-current voltage generated in a secondary coil of the transformer. The separation unit configured to use the alternating-current voltage generated in the secondary coil of the transformer as an input and generate an alternating-current voltage, from which alternating-current components are separated, as an output. The second rectifier smoothing unit is configured to rectify and smooth the output of the separation unit. The resistor is connected to a line branched from a line that connects the separation unit to the second rectifier smoothing unit. The rectifier unit is connected in series between the resistor and a reference potential.

Abstract: Detecting when the on-board power supply is powered on or off by an auto activity detection circuit by determining if the reference clock signal (TCLK) is toggling, and, if the reference clock signal is toggling, then charging a capacitor to a high voltage in the auto activity detection circuit based on the toggling reference clock signal, and outputting an on-board power supply activity signal based upon the high voltage by the auto activity detection circuit indicative of whether or not the on-board power supply is active.

Abstract: A semiconductor package includes a VLSI semiconductor die and one or more output circuits connected to supply power to the die mounted to a package substrate. The output circuit(s), which include a transformer and rectification circuitry, provide current multiplication at an essentially fixed conversion ratio, K, in the semiconductor package, receiving AC power at a relatively high voltage and delivering DC power at a relatively low voltage to the die. The output circuits may be connected in series or parallel as needed. A driver circuit may be provided outside the semiconductor package for receiving power from a source and driving the transformer in the output circuit(s), preferably with sinusoidal currents. The driver circuit may drive a plurality of output circuits. The semiconductor package may require far fewer interface connections for supplying power to the die.

Abstract: An ignition coil has a ferromagnetic core, a primary coil surrounding a portion of the core and wrapped helically with a conductor, a winding form having partitions extending outwardly of a tubular surface of the winding form, and a secondary coil wrapped on the winding form. The partitions define a plurality of annular coil chambers including central chambers and end chambers. The end chambers have a spiral land. The secondary coil includes coil sections in each of the plurality of coil chambers. The secondary coil has coil turns in the end chambers in a spiral configuration on the spiral land and increasing progressively in diameter toward the central chambers.

Abstract: Circuits, methods, and apparatus that react to brownout or near brownout conditions and mitigate complications that may result. Examples may turn off one or more circuits, such as a Wi-Fi transceiver when a brownout condition is reached or neared. Other examples may provide circuits, methods, and apparatus that proactively avoid brownout conditions. These examples may detect that a brownout condition may occur and take steps, such as Wi-Fi traffic shaping, to avoid them. Still further examples may react to brownout or near brownout conditions one or more times, then preemptively act to avoid further brownout conditions.

Abstract: A dust collector in one aspect of the present invention comprises a dust collection portion, a communication portion, and an interlock operation control portion. When the communication portion receives an interlock command transmitted from an electric working machine, the interlock operation control portion makes the dust collection portion operate interlocking with the electric working machine. The interlock operation control portion includes a storage portion, in which identification information specific to the electric working machine with which the dust collection portion is to be made to perform the interlock operation is stored.

Abstract: A multi-engine locomotive configuration is disclosed wherein engine outputs to DC traction motors are controlled by connecting the alternators with rectifiers in series for each engine of a multi-engine locomotive. This configuration uses the minimum number of rectifying diodes, eliminates the need for chopper circuits and simplifies the method of controlling the sequencing and output of two or more engines. The approach, which reduces the parasitic power loss by reducing the number of diodes, also enables a simplified means to efficiently manage engine cooling without additional cost and complexity of electrically-driven radiator fans.

Abstract: A circuit for controlling standby power consumption is disclosed. The circuit includes a main power supply, a transformer, a first switch transistor, a load, a low frequency divider circuit, and a signal generation unit. The transformer connects to one end of the signal generation unit and an input end of the low frequency divider circuit. The signal generation unit transmits the level signals to the low frequency divider circuit according to the operating mode and obtains the power supply voltage of the transformer. The second frequency of the low level signals is greater than the first frequency of the high level signals. The source of the first switch transistor connects to a load to obtain the frequency of the output signals to be operating frequency so as to control the turn-on duration of the transformer. So the power supply voltage in the standby mode and the power consumption are reduced.

Abstract: A power supply includes a power conversion circuit configured to selectively operate in one of an active mode in which output power is supplied to a load and a standby mode in which output power is not supplied to the load, a plurality of auxiliary circuits including a first auxiliary circuit and a second auxiliary circuit, a bias node configured to supply power to the plurality of auxiliary circuits, and a switch that is coupled between the bias node and the first auxiliary circuit and that is configured to disconnect the first auxiliary circuit from the bias node in response to a control signal.

Abstract: A device for driving a multi-channel light-emitting diode, includes a power supply unit for supplying power supplied from the outside; a light-emitting diode block, which is connected to a (+) terminal of the power supply unit and includes one or more light-emitting diode groups, each including at least one light-emitting diode; a current commutation unit, which is connected to a cathode of the light-emitting diode block and commutates a current flowing through the light-emitting diode groups; a reference voltage unit, which is electrically connected to the current commutation unit and provides a reference voltage to the current commutation unit; and a current driving unit for receiving power from the power supply unit, driving the light-emitting diode block through the current commutation unit, and determining a driving current flowing through the light-emitting diode groups.

Abstract: Upon sending out a first power-supply voltage having a first value to first and second power supply lines in a first mode and sending out a second power-supply voltage having a second value lower than the first value to the second power supply line in a second mode, when switching a power-supply device from the first mode to the second mode, the value of the first power-supply voltage generated in a first power-supply circuit is changed to the second value first, the first and second power supply lines are temporarily connected together and then cut off from each other, and then the generating operation of the first power-supply voltage is stopped.

Abstract: A device for transmitting electrical power from a wall to a wing attached thereto about a hinge axis includes a wall part fastened to the wall. A wing part is fastened to the wing. A primary coil arranged on the wall part comprises an end side, a primary coil winding and a primary coil housing with ferromagnetic or ferrimagnetic properties. The primary coil housing is open on an end side facing the wing part and substantially covers the primary coil winding on an opposite end side. A secondary coil arranged on the wing part comprises a secondary coil winding and a secondary coil housing with ferrimagnetic or ferromagnetic properties. The secondary coil housing is open on an end side facing the wall part and substantially covers the secondary coil winding on an opposite end side. The end sides of the primary coil and the secondary coil face each other.

Abstract: The present disclosure discloses a flyback quick start driving circuit, comprising: a voltage input unit, a transformer including a primary winding, a secondary winding, and an auxiliary winding, a driving unit for controlling the primary winding of the transformer, a voltage pull-up unit, and a feedback control unit. The voltage pull-up unit performs a charging process according to the direct-current from the voltage input unit, so as to enable the output voltage rise up to a starting voltage which is input the driving unit. The driving unit output a control signal to drive the primary winding. Thus, a voltage is created across the auxiliary winding. The feedback control unit gets the voltage of the auxiliary winding, and determines whether to stop the charging of the voltage pull-up unit or not according to the voltage of the auxiliary winding. The circuit can be started quickly and have lower loss of the power.

Abstract: Various of the disclosed embodiments contemplate systems and methods in an X-ray imaging system, such as a CT system, facilitating more crisp switching between high and low voltages at an X-ray tube. Certain embodiments circuits which store and discharge energy to improve voltage rise and fall times. These circuits may mitigate the effects of losses, hysteresis cycles, and leakage currents. More controlled voltage rise and fall times may improve X-ray emission and detection synchronization.

Abstract: A switching power supply includes a first auxiliary power supply for causing a first auxiliary winding of a transformer to induce voltage by ON/OFF control of a switching element connected to a primary winding of the transformer. The voltage induced by the first auxiliary winding charges a capacitor in the first auxiliary power supply. The switching power supply also includes a control circuit for starting and stopping the ON/OFF control of the switching element by comparing a voltage of the capacitor with a first threshold value, an activation circuit for charging the capacitor with voltage from the power supply input to the switching power supply, and a determination unit for determining a lifespan of the switching power supply based on the voltage of the capacitor after the voltage of the capacitor becomes greater than or equal to the first threshold value.

Abstract: A power source apparatus for a display is provided, which comprises a voltage generating section capable of controlling outputting or output termination of one or more predetermined output voltages, and a switching section provided between an output terminal of the predetermined output voltage and a predetermined reference potential terminal. The switch section is turned from OFF to ON when the voltage generating section performs the output termination control.

Abstract: The vertical/horizontal amplitude control device for controlling a vertical amplitude and a horizontal amplitude of an image display device for displaying a video signal includes a brightness level detector for detecting a brightness level of the video signal, a vertical amplitude controller for controlling the vertical amplitude based on the brightness level, and a horizontal amplitude controller for controlling the horizontal amplitude based on the brightness level. The device controls the vertical and horizontal amplitudes into constant without a delay from a change of a video signal even when the brightness level of the video signal abruptly changes.

Abstract: A video display includes a scanner operable at a first frequency and a higher second frequency. A switch mode power supply drives a transformer with three secondaries. First and second rectifiers & filters are associated with the first and second secondaries. A rectifier is coupled to the third secondary and by way of a switch to the first filter. Feedback from the first filter controls the SMPS. In a first operating mode, the scanner is operated at the first frequency, the switch is open, the scanner supply is a first voltage from the first filter, and ancillary equipment is supplied with a third voltage by the second filter. In a second operating mode, the scanner is operated at the second frequency, the switch is closed, the scanner supply is a second voltage, higher than the first, from the first filter, and ancillary equipment is supplied with the same third voltage.

Abstract: The invention concerns a scanning circuit, comprising a power supply providing a negative voltage on a first terminal (Tdown), an intermediate voltage on a second terminal (Gnd) and a positive voltage on a terminal of a switch (S), the other terminal of the switch being connected to a third terminal (Tup), a control circuit (6) supplied by connections to the second and third terminals, a differential amplifier receiving a positive and a negative input signal provided by the control circuit, a power amplifier controlled by the differential amplifier, both amplifiers being supplied by connections to the first and third terminals, a deflection coil (Ly) connected between the output of the power amplifier and the second terminal, biasing means setting, when the switch is open, the output of the differential amplifier so that the possible current paths through the power amplifier between the deflection coil and the first terminal are cut.

Abstract: A method and circuit for digitally controlled vertical C linearity correction with constant start and end points without using an AGC. A squared voltage and a negative squared voltage are added as a correction voltage to a sawtooth-shaped ramping voltage that is employed to sweep an electron beam across a display. Line spacing toward the edges of a screen are maintained equal as a result enabling a uniform presentation of a picture on a non-spherical display. A digitally controlled attenuator determines a correction coefficient for correction voltages. The correction voltage is also processed by a sample-and-hold circuit to obtain a peak squared voltage. The peak squared voltage is then compared to a DC reference voltage and an offset adjustment current determined, based on a result of the comparison. The correction voltage is then added to the ramping voltage, which is also shifted by the offset amount.

Abstract: In a configuration equipped with an anode current detecting resistor connected between a ground side terminal of secondary coils wound around a flyback transformer and generating a high voltage for an anode of a CRT, it is equipped with declination detecting device which detects declination of a voltage of the ground side terminal, and control device which stops an operation of a horizontal output transistor, after a state is shifted from a power OFF state to a power ON state, when the declination detecting device 5 does not detect declination of a voltage of the ground side terminal in case that a predetermined period has passed.

Abstract: A prefocus lens section in an electron gun assembly includes a second grid that is disposed on an electron beam generating section side, a third grid that is disposed on a main lens section side, and a shield grid that is disposed between the second grid and the third grid. The shield grid is a cup-shaped electrode with a side wall that surrounds an outer peripheral part of the third grid, which part is located on the second grid side, and extends in parallel to a tube axis. The shield grid has a bottom surface disposed to face the second grid and has an open end disposed to face the third grid. A relationship, Ec<Vf<Er, is established, where Ec is a potential applied to the second grid, Vf is a potential applied to the shield grid, and Er is a potential applied to the third grid.

Abstract: A signal processing apparatus (1) includes a power supply input (20), a power supply connection (30) and a power supply output (27). A supply voltage generator (33) is connected to the power supply input (20) via disconnection circuit (72). A detector (70), provided in the area of the power supply connection (30), enables a supply of power to the power supply output (27) to be detected and, when a supply of power to the power supply output (27) is detected, enables the disconnection circuit (72) to be set, via a control circuit (73), to a state in which the power supply input (20) and the supply voltage generator (33) are connected.

Abstract: An apparatus and a method for protecting a video display device, having an anode and a cathode, against excessive beam current conditions. In particular, the present invention protects the video display device against zero-biasing of the device, wherein the cathode driver circuit is supplied by a plurality of power supplies and the loss of anyone of the power supplies causes zero-biasing of the cathode.

Abstract: A display device includes a display unit with a plurality of pixels for displaying picture images, a driving unit for controlling operation of the respective pixels of the display unit, a power control unit for supplying a power to the driving unit and the display unit while controlling the power, and an abnormal operation prevention circuit. The abnormal operation prevention unit prevents the pixels from being deteriorated in display characteristics due to interception of an input signal into the driving unit when the power is continuously supplied to the driving unit from the power control unit.

Abstract: The vertical/horizontal amplitude control device for controlling a vertical amplitude and a horizontal amplitude of an image display device for displaying a video signal includes a brightness level detector for detecting a brightness level of the video signal, a vertical amplitude controller for controlling the vertical amplitude based on the brightness level, and a horizontal amplitude controller for controlling the horizontal amplitude based on the brightness level. The device controls the vertical and horizontal amplitudes into constant without a delay from a change of a video signal even when the brightness level of the video signal abruptly changes.

Abstract: Disclosed is a power-supplying apparatus for an electron gun in a color display tube (CDT) provided with an fly back transformer (FBT) having a focus voltage output terminal and an acceleration voltage output terminal, further having a power supplying part supplying a predetermined reference voltage; a focus voltage detection part detecting a focus voltage of the focus voltage output terminal; and a focus voltage boost part boosting the focus voltage of the focus voltage output terminal in case that the focus voltage detected by the focus voltage detection part is lower than the reference voltage of the power supplying part. With this configuration, it is possible to recover the voltage of the focus voltage output terminal dropped according to the grid discharging of the electron gun in the color display tube to the normal voltage.

Abstract: An image display is operable with video signals having a plurality of scanning frequencies and comprises a cathode ray tube for the display of ones of the video signals. A deflection coil is mounted on the cathode ray tube and a horizontal deflection amplifier is coupled to the deflection coil and generates a deflection current therein. A plurality of retrace capacitors are controllably coupled to the horizontal deflection amplifier in response to a selected scanning frequency to maintain a substantially constant active picture display area with the ones of the video signals having the plurality of scanning frequencies.

Abstract: A fly back transformer comprises a horizontal output section; a low-voltage bobbin forming a first coil; a high-voltage bobbin forming a second coil having high-voltage coil layers and high-voltage rectifier diodes connected in series between upper terminal pins and lower terminal pins; a focusing pack having a PCB being printed with an adjustable resistor, and a focus input terminal; a bleeder resistor detachably fixed in position to the high-voltage bobbin and electrically connected with a high-voltage terminal of the high-voltage bobbin and the focus input terminal; and a focus-drawing wire disposed between the first and the last of the high-voltage coil layers, and having one end connected to draw a voltage generated between the high-voltage terminal and a low-voltage terminal of the high-voltage bobbin and the other end connected with the focus input terminal.

Abstract: A power supply for a video display tube includes a deflection transformer with a primary winding powered with a scan voltage which has a first value when displaying signal according to a first video standard and a second voltage when displaying video according to a second standard. A secondary winding of the transformer produces filament voltage for the display tube. A variable coupler couples the filament voltage to the filament of the picture tube in an amount established by a control signal. A memory produces a first control signal in response to the first scan voltage and a second control signal in response to the second scan voltage. The first and second control signals are selected so that the voltage coupled from the transformer to the filament is the same at both scan voltages.

Abstract: A fly back transformer comprises a horizontal output section; a low-voltage bobbin forming a first coil; a high-voltage bobbin forming a second coil having high-voltage coil layers and high-voltage rectifier diodes connected in series between upper terminal pins and lower terminal pins; a focusing pack having a PCB being printed with an adjustable resistor, and a focus input terminal; a bleeder resistor detachably fixed in position to the high-voltage bobbin and electrically connected with a high-voltage terminal of the high-voltage bobbin and the focus input terminal; and a focus-drawing wire disposed between the first and the last of the high-voltage coil layers, and having one end connected to draw a voltage generated between the high-voltage terminal and a low-voltage terminal of the high-voltage bobbin and the other end connected with the focus input terminal.

Abstract: A protecting circuit for a horizontal transistor used for protecting the horizontal transistor of a horizontal deflecting circuit in a cathode ray tube. The protecting circuit comprises a switching circuit and a power sensor. The switching circuit is coupled to at least one sub capacitor of a S-character correcting loop. When the switching circuit is on, the switching circuit further connects the sub capacitors and the main capacitor of the S-character correcting loop in parallel. The power sensor is for detecting whether the D.C. voltage source is on. When the power sensor detects that the D.C. voltage source is off, the power sensor will turn on the switching circuit. The invention reduces a surge of the cross voltage VCE of the horizontal transistor when the system is off, therefore the invention achieves the goals of protecting the horizontal transistor and raising yield of the products.

Abstract: An electromagnetic quadrupole circuit capable of always performing the optimal correction of the spot form is provided with: a current detecting section 20 for detecting the peak value and bottom value of current flowing along an electromagnetic quadrupole coil 8; a control section 50 for supplying a prescribed peak control value and a prescribed bottom control value; a first power source 16 for controlling the feedback of the amount of supply current based on the peak value detected by the current detecting section 20 and the peak control value supplied from the control section 50; and a second power source 17 for controlling the feedback of the amount of supply current based on the bottom value detected by the current detecting section 20 and the bottom control value supplied from the control section 50.

Abstract: A horizontal drive circuit employed in CRT displays which uses a switch-mode power supply operating in a boost topology to generate the appropriate supply voltage needed by the horizontal drive circuit is provided. The boost power supply is integrated into the horizontal drive circuit which allows for low printed circuit board area, low cost, and good performance over many different horizontal frequencies.

Abstract: A horizontal drive circuit employed in CRT displays which uses a switch-mode power supply operating in a boost topology to generate the appropriate supply voltage needed by the horizontal drive circuit is provided. The boost power supply is integrated into the horizontal drive circuit which allows for low printed circuit board area, low cost, and good performance over many different horizontal frequencies.

Abstract: A method and device are described for detecting whether a flash (F) has occurred in the high voltage part of a combined high voltage and horizontal deflection circuit (100) in an apparatus comprising a cathode ray tube (CRT), such as for instance a television set, a monitor, etc. The possible flash is detected by checking the fly-back pulse (70) of the horizontal deflection circuit (16) for deviations that reflect the occurrence of a flash. One possible distortion indicative for the occurrence of a flash is bouncing of the fly-back pulse. Another possible distortion indicative for the occurrence of a flash is collapse of the fly-back pulse. Another possible deviation indicative for the occurrence of a flash is a substantial decrease of the storage time (&tgr;S) of the line deflection transistor (30).

Abstract: An apparatus for the correction of East-West distortion of images produced on the screen of a picture tube. More particularly, it concerns an electronic circuit for dynamically controlling the AC component of the drive signal to an East-West amplifier (14) in a picture tube horizontal scanning system. The electronic circuit comprises an input (44,66) for receiving a signal related to the beam current of the tube, an output for connection to the input of the East-West amplifier, a capacitive element (32,64), and an active control device (30,60) for controlling the capacitive element in response to the signal at the circuit input.

Abstract: Disclosed is a deflection yoke mounted around a glass bulb of a CRT so as to cover a predetermined area of the glass bulb. The predetermined area is where an outer shape of the glass bulb smoothly goes from circular to substantially rectangular along a tube axis of the CRT. The deflection yoke includes a horizontal deflection coil disposed in a shape to fit with the outer shape of the glass bulb, and a funnel-shaped ferrite core disposed to surround the horizontal deflection coil. The inner shape of the ferrite core is circular throughout a length of the ferrite core.

Abstract: A cathode ray tube assembly includes a funnel having a neck, an electron gun having an electron emitter within the neck and having at least two focus electrodes for forming an electron lens for focusing and accelerating electron beams emitted from the electron emitter, lead pins extending through the neck and connected to the first and second focus electrodes, and a socket with pin connection terminals connectable to the lead pins; a voltage applying unit for applying an AC voltage to at least one of the focus electrodes through a lead pin connected to the focus electrode; and a voltage drop unit for reducing the AC voltage applied by the voltage applying unit to a second of the focus electrodes so that a reduced voltage is applied to a lead pin connected to the second focus electrode, the voltage drop unit being connected to the lead pins through pin connection terminals of the socket.

Abstract: An x-ray protection circuit for a video processor, to disable a horizontal output pulse when a voltage level on the x-ray input exceeds a reference voltage. The x-ray protection circuit comprises a comparator and a bistable device, and incorporates a reset circuit. The reset circuit enables the initialisation of the protection circuit whilst the power is switched on.

Abstract: High-voltage power supplies used in a Cathode Ray Tube (“CRT”) manufacturing process should be protected from residue, dust and other contaminants. This will prevent possible damage to the voltage power supply and danger to people and equipment that can result from operation of a dirty voltage power supply. A protective housing made of a non-conductive, insulating material is used to encase and protect the voltage power supplies used in a CRT manufacturing process. This protective housing protects those voltage power supplies from degradation or damage due to the dust, residue or other contaminants that arise from the CRT manufacturing process. A cooling system may be incorporated into the housing to manage thermal energy generated by the voltage power supply unit.

Abstract: A circuit for stabilizing a screen voltage of the video display apparatus is capable of supplying a uniform screen voltage to the video display apparatus even though a voltage level of an output voltage from a flyback transformer is changed. A horizontal output section generates a horizontal output voltage in response to a horizontal driving signal. A flyback transformer supplies a first power source to a primary winding according to the horizontal output voltage, induces a voltage in a secondary winding thereof based on a turns-ratio, and induces a voltage in a tertiary winding thereof according to the voltage induced in the secondary winding.

Abstract: A color cathode ray tube has quadrupole elements which increase and decrease the distance between the electron beams as a function of the deflection. Two co-operating elements have their windings connected in series with each other to minimize dissipation in the driving circuits. One driving circuit provides a common current which flows through both quadrupole elements, while another driving circuit provides a difference current to a node between the quadrupole elements.