公开(公告)号：DE69105400T2

公开(公告)日：1995-06-08

申请号：DE69105400

申请日：1991-07-29

Applicant: IBM

Inventor： KOBAYASHI MASAKI ,  MORI MASAKI ,  MORIMOTO NORISHIGE

IPC: H04N5/63 ,  G09G1/00 ,  G09G1/04 ,  G09G1/16 ,  H02M3/28 ,  H02M3/335 ,  H04N3/185 ,  H02M3/338

公开(公告)号：DE69105400D1

公开(公告)日：1995-01-12

申请号：DE69105400

申请日：1991-07-29

Applicant: IBM

Inventor： KOBAYASHI MASAKI ,  MORI MASAKI ,  MORIMOTO NORISHIGE

IPC: H04N5/63 ,  G09G1/00 ,  G09G1/04 ,  G09G1/16 ,  H02M3/28 ,  H02M3/335 ,  H04N3/185 ,  H02M3/338

公开(公告)号：JPH0491579A

公开(公告)日：1992-03-25

申请号：JP20527390

申请日：1990-08-03

Applicant: IBM

Inventor： KOBAYASHI MASAKI ,  MORI MASAKI ,  MORIMOTO NORISHIGE

IPC: H04N5/63 ,  G09G1/00 ,  G09G1/04 ,  G09G1/16 ,  H02M3/28 ,  H02M3/335 ,  H04N3/185

Abstract: PURPOSE: To improve the efficiency of a power unit and reduce the size of the unit by constituting a switching regulator by using a plurality of horizontal synchronizing pulse trains having different frequencies so that the regulator can work in a plurality of display modes. CONSTITUTION: A horizontal synchronizing pulse train having a selected frequency is supplied to a waveform shaping circuit 2 through a line 11. An automatic frequency control circuit AFC3 incorporates an oscillation circuit 3A and a synchronizing circuit 3B and, since the saw tooth wave generated from the circuit 3A is corrected to a saw tooth wave having a frequency which is a multiple times as high as that of the horizontal synchronizing pulse train impressed upon the circuit 3B, the circuit 3B becomes synchronous to the frequency of the horizontal synchronizing pulse impressed upon the circuit 3B by generating a feedback signal on a line 13A. The power control circuit 8 of a switching regulator type power source circuit 9 receives a pulse from a line 16 and a feedback signal from a line 17 and generates a switching pulse on a line 18. Therefore, a power unit can operate at a frequency which is several times as high as a plurality of horizontal synchronizing frequencies and, moreover, synchronously and the principal design parameters can be selected so that the optimum operating condition can be obtained.

公开(公告)号：JPH02142355A

公开(公告)日：1990-05-31

申请号：JP29472788

申请日：1988-11-24

Applicant: IBM JAPAN

Inventor： KOBAYASHI MASAKI ,  MORI MASAKI ,  NAKANISHI HIDEAKI

IPC: H04N5/63 ,  H02M3/28 ,  H02M3/335 ,  H04N3/18

Abstract: PURPOSE:To prevent voltage stability from deteriorating by operating a switching regulator at a frequency N or 1/N times the frequency of a master switching regulator. CONSTITUTION:The power of a power source 10, after it is rectified and smoothed, is supplied to a master switching regulator(MSR) 13 and slave switching regulators(SSR) 14, 15A, and 15B. For switching, the regulator MSR 13 oscillates at 130kHz when a display control circuit 6 is turned off; it oscillates at 126kHz being four times the horizontal deflection synchronous frequency of a horizontal and vertical deflection control circuit 7 when the display control circuit 6 is turned on. The regulators SSR 15A, 15B oscillate at frequencies 1/4 and 1/2 times that of the MSR 13 respectively for switching. By oscillating all the SSRs synchronized with the MSR 13, a beat phenomenon is prevented from being generated.

公开(公告)号：JPH0744146A

公开(公告)日：1995-02-14

申请号：JP17640293

申请日：1993-07-16

Applicant: IBM

Inventor： KOBAYASHI MASAKI ,  KATAOKA RIEKO ,  MORI MASAKI

IPC: G09G5/00 ,  G09G5/18

Abstract: PURPOSE: To increase the kinds of identification signal which can be generated in a display device. CONSTITUTION: Selectors 14a-14d receive a vertical synchronizing signal through a line 25, and receive a frequency multiplication signal based on a horizontal synchronizing signal through a line 29. The output sides of the selectors 14a-14d are connected with four output lines 15a-15d assigned for the transmission of an identification signal. Each selectors 14a-14d includes a frequency-divider which frequency-divides the frequency multiplied signal, and generates plural frequency-division signals, and an open signal indicating an open state and a ground signal indicating a grounded state are generated inside. A control circuit 10 receives input information for designating the identification signal through a line 11, and applies a control signal corresponding to the input information through control lines 13a-13d to each selector 14a-14d. Each selector 14a-14d transmits any one of the vertical synchronizing signal, plural frequency- division signals, open signal, and ground signal to the corresponding output line as one signal element constituting the identification signal according to the control signal.