摘要:
Sustain electrodes (X1, X2, . . . ) of a PDP (20) are grounded. A PFC converter (40) converts an alternating voltage into a DC voltage (Vs) and applies it directly across a PDP driver (10). A sustaining pulse generating section (1) converts the DC voltage (Vs) into a primary voltage pulse (VF), and applies it across a primary winding (2a) of a transformer (2). The transformer (2) converts the primary voltage pulse (VF) into a sustaining voltage pulse (Vp), and applies it to scan electrodes (Y1, Y2, . . . ) of the PDP (20) through a reset/scanning pulse generating section (3). An inductor (L) is connected in parallel with a secondary winding (2b) of the transformer (2). The inductor (L) resonates with the panel capacitance of the PDP (20) at the rising and falling edges of the sustain voltage pulse (Vp).
摘要:
A reset pulse generating section applies the total of voltages of a positive voltage source and two constant-voltage sources from a high side ramp wave generating section to a high side scan switching device as the upper limit of a reset voltage pulse, and applies the ground potential from a low side ramp wave generating section to a low side scan switching device as the lower limit of the reset voltage pulse. A sustaining pulse generating section applies the upper and lower limits of a sustaining voltage pulse through a common sustaining pulse transmission path to the low side scan switching device.
摘要:
Pulse generating sections (1X, 1Y) convert a DC voltage (Vs) into voltage pulses (Vp), and apply the pulses to the sustain and scan electrodes (X, Y) of a PDP (20). Recovery switching devices (Q3X, Q4X, Q3Y, Q4Y) of power recovery sections (2X, 2Y) are turned on and off under the rising and falling edges of the voltage pulses (Vp), thereby connect recovery inductors (LpX, LpY) to recovery capacitors (CX, CY). Then, the recovery inductors (LpX, LpY) resonate with the panel capacitance (Cp). While the amounts of the resonance currents (ILX, ILY) are small, the inductances of the recovery inductors (LpX, LpY) are high. When the amounts of the resonance currents (ILX, ILY) exceed a threshold value, the inductances of the recovery inductors (LpX, LpY) are reduced.
摘要:
A reset pulse generating section applies the total of voltages of a positive voltage source and two constant-voltage sources from a high side ramp wave generating section to a high side scan switching device as the upper limit of a reset voltage pulse, and applies the ground potential from a low side ramp wave generating section to a low side scan switching device as the lower limit of the reset voltage pulse. A sustaining pulse generating section applies the upper and lower limits of a sustaining voltage pulse through a common sustaining pulse transmission path to the low side scan switching device.
摘要:
A driving apparatus of a plasma display panel includes a sustain generator section that sustains sustain electrodes at a specific potential (ground potential) and applies alternately a first positive pulse voltage and a first negative pulse voltage to scan electrodes, as a sustain pulse voltage, during a sustain period, and an address voltage generator that applies a voltage changing temporally to address electrodes. The address voltage generator applies a second pulse voltage with a predetermined polarity to the address electrode in synchronization with a pulse with the same polarity as the second pulse voltage out of sustain pulse voltages during the sustain period.
摘要:
A reset pulse generating section applies the total of voltages of a positive voltage source and two constant-voltage sources from a high side ramp wave generating section to a high side scan switching device as the upper limit of a reset voltage pulse, and applies the ground potential from a low side ramp wave generating section to a low side scan switching device as the lower limit of the reset voltage pulse. A sustaining pulse generating section applies the upper and lower limits of a sustaining voltage pulse through a common sustaining pulse transmission path to the low side scan switching device.
摘要:
A PDP driving circuit is comprised of a power recovery unit for recovering an electric power from a capacitive load by resonance operation with PDP which is the capacitive load Cp, and reusing the recovered power. The power recovery unit includes a recovery inductor for resonating with the capacitive load, a recovery switch element for connecting the recovery capacitor to the capacitive load and recovery inductor, and forming a channel for passing resonance current, a counterflow preventive diode for blocking flow of current in the recovery switch element in reverse polarity direction, and a protective diode for forming a closed current channel including the recovery inductor and recovery switch element when the counterflow preventive diode is changed from ON state to OFF state.
摘要:
A drive circuit for driving a plasma display panel (PDP) includes a pulse voltage generation circuit (5101) that contains main switching elements disposed on the high voltage side and on the low voltage side, is operable to generate a pulse voltage by operating the main switching elements in accordance with an output voltage from a first power supply (V1) and apply the pulse voltage to a PDP scan electrode and sustain electrode, and a reset voltage generation circuit (52) operable to generate a reset voltage in accordance with an output voltage from a second power supply (V2) and apply it to the PDP. The pulse voltage generator C circuit contains a first diode (D11) that prevents the voltage outputted by the reset voltage generation circuit from being applied backward to the first power supply and a first switching element (S11) connected to the first diode in parallel.
摘要:
A drive circuit for driving a plasma display panel (PDP) includes a pulse voltage generator that contains main switching elements disposed on a high voltage side and on a low voltage side, is operable to generate a pulse voltage by operating the main switching elements in accordance with an output voltage from a first power supply and apply the pulse voltage to a PDP scan electrode and sustain electrode, and a reset voltage generator operable to generate a reset voltage in accordance with an output voltage from a second power supply and apply it to the PDP. The pulse voltage generator contains a first diode that prevents the voltage output by the reset voltage generator from being applied backward to the first power supply and a first switching element connected to the first diode in parallel.
摘要:
An image forming apparatus includes: a latent image forming unit scanning and exposing an image carrier according to image data, to form a latent image; a transfer body on which a toner image is transferred and a reference index for setting an output start time point of the image data is formed; a detecting unit facing the reference index and outputting a detection signal changing in accordance with passing of the reference index; and a controller controlling the output start time point with the detection signal. The controller starts a first period during which change of the detection signal is ignored, according to first change of the detection signal, starts a second period after the first period, regards second change of the detection signal occurring first in the second period as a reference of the output start time point, and ignores change of the detection signal after the second change.