公开(公告)号：JPH08223907A

公开(公告)日：1996-08-30

申请号：JP1771195

申请日：1995-02-06

Applicant: IBM

Inventor： NAKANISHI HIDEAKI

IPC: H02J7/10 ,  G05F1/56 ,  G05F1/565 ,  H02J7/00 ,  H02M3/28 ,  H02M3/335 ,  H02M7/217

Abstract: PURPOSE: To prevent an electronic equipment from being shut down even if the electronic equipment requires more excessive power as compared with a normal operation due to inrush current by performing constant current feedback control for each output terminal voltage. CONSTITUTION: A constant current value controller 20 constantly monitors an output terminal voltage VOUT by inputting power lines 18 in parallel and at the same time adjusts current by operating the resistance of a variable resistor RV in response to VOUT. Namely, when starting a system 100, an excessive power is momentarily required. In this case, the constant current value controller 20 controls RV based on a control table, no constant current feedback control means is activated even if output current exceeds a prescribed value, and the output current can be increased while maintaining the output terminal voltage VOUT by a low-voltage feedback control means, thus preventing an electronic equipment from being shut down.

公开(公告)号：JP2003134812A

公开(公告)日：2003-05-09

申请号：JP2001319210

申请日：2001-10-17

Applicant: IBM

Inventor： NAKANISHI HIDEAKI ,  TAKAHASHI TOSHIKI

IPC: H02M3/28

Abstract: PROBLEM TO BE SOLVED: To provide a switching power supply capable of solving together the problem of stability of loop control output voltage, the problem of ground loop, and the problem of MPR-II and audio performance. SOLUTION: This switching power supply has a first rectifying smoothing means (17, a C3) rectifying AC voltage smoothed of a commercial power source, a switching transformer 19 connecting in series with a switching means 21, a second rectification smoothing means (D1, C4), an output line and an output return line supply voltage obtained by this second rectification smoothing means to a load side, a control means 23 for fixedly controlling the voltage of the output line, a parallel circuit of a capacitor Cs and a resistor Rs connected in between the output return line and the ground line, and a capacitor Cp connected between one end of the capacitor C3 for smoothing and the ground line.

公开(公告)号：JP2002247847A

公开(公告)日：2002-08-30

申请号：JP2001044204

申请日：2001-02-20

Applicant: IBM

Inventor： NISHINO HIROZO ,  ODAOHARA SHIGEFUMI ,  NAKANISHI HIDEAKI

IPC: H01R13/703 ,  G06F1/26 ,  G06F1/32 ,  H02J1/00 ,  H02M3/28 ,  H02M3/335 ,  H02M7/12

Abstract: PROBLEM TO BE SOLVED: To reduce power loss by reducing the operating frequency of a power supply unit on standby, for example, in soft-off or suspended state or when a line has not been connected. SOLUTION: An AC adaptor 10 is installed so that the adaptor is connectable to equipment main body through a power line, and is provided with a rectification bridge diode 11 for rectifying inputted alternating-current voltage; a capacitor 12 for smoothing the voltage; a switching transistor 13 that performs switching of the rectified and smoothed voltage; and a pulse width modulation IC 15 that provides an operating frequency for the performed switching. The pulse width modulation IC 15 provides a first operating frequency to the switching transistor 13 when the equipment main body performs normal operation, and a second operating frequency lower than the first operating frequency to the switching transistor 13 when the power line between the adaptor and the equipment main body is disconnected or when the equipment main body is in a specified standby state.

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.