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1. 发明专利

JPH09149643A DC POWER SUPPLY APPARATUS 失效
公开(公告)号：JPH09149643A
公开(公告)日：1997-06-06
申请号：JP30449395
申请日：1995-11-22
申请人： HITACHI LTD , HITACHI INFORMATION TECHNOLOGY
发明人： SHIMA HIROSHI , OKAWA HIROSHI , KONO NAOFUMI
IPC分类号： H02M7/06 , H02M7/10
摘要： PROBLEM TO BE SOLVED: To utilize various AC input voltages with automatic discrimination by a method wherein an approximately constant DC voltage is supplied to a load connected to a main circuit regardless of the connection of a stepdown transformer. SOLUTION: When the voltage of a commercial power supply 1 is AC 100V, a voltage which is stepped down by a stepdown transformer 2 and rectified and smoothed is applied to voltage dividing resistors 10 and 11, a shunt regulator 18 is turned on in accordance with a ratio between the divided voltages, a control transistor 29 is turned on, a relay contact 23b is closed and, in the positive half cycle period of the AC input of the main circuit, a smoothing capacitor 4 is charged and, in the negative half cycle period, a smoothing capacitor 5 is charged. When the voltage of the commercial power supply 1 is AC 200V, as the rectified and smoothed voltage is doubled, the shunt regulator 18 is turned off, the control transistor 29 is turned off, the relay contact 23b is opened and the smoothing capacitors 4 and 5 which are connected in series are charged. In both the cases, the voltage is full-wave rectified by a load 7 in parallel connection to obtain a required voltage. As a result, a various AC input voltage can be utilized with automatic discrimination.

2. 发明专利

JPH03105975A SEMICONDUCTOR RECTIFIER DIODE; POWER-SUPPLY APPARATUS AND COMPUTER USING IT 失效
公开(公告)号：JPH03105975A
公开(公告)日：1991-05-02
申请号：JP24203589
申请日：1989-09-20
申请人： HITACHI LTD
发明人： KOSAKA HIROSHI , MURAKAMI SUSUMU , TAKADA MASANORI , YAGINUMA TAKAO , KONO NAOFUMI
IPC分类号： H01L29/47 , H01L29/861 , H01L29/872 , H02M3/28
摘要： PURPOSE:To achieve a low loss of a semiconductor rectifier diode by specifying the following: an interval between third stripe-shaped semiconductor regions; their depth; and a width of a depletion layer formed between a first semiconductor region and the third semiconductor regions. CONSTITUTION:A semiconductor substrate 1 is provided with the following: a first n-type semiconductor region 13 adjacent to the surface 11; a second n type semiconductor region 14 adjacent to the main surface 12 on the other side; and a plurality of third p type stripe-shaped semiconductor regions 15. A mutual interval between the third semiconductor regions 15 is designated as W; a depth of the third semiconductor regions 15 is designated as Di a width of a depletion layer which is spread to the side of the first semiconductor region 13 by a diffusion potential of a p-n junction J formed between the first semiconductor region 13 and the third semiconductor regions 15 is designated as w0. Then, the third semiconductor regions 15 are formed so as to satisfy a relationship of 2wo

3. 发明专利

JPS6328259A SWITCHING REGULATOR CIRCUIT 失效
公开(公告)号：JPS6328259A
公开(公告)日：1988-02-05
申请号：JP17112086
申请日：1986-07-21
申请人： HITACHI LTD
发明人： KONO NAOFUMI
IPC分类号： H02M3/155
摘要： PURPOSE:To get up high switching speed and improve efficiency, by giving forward bias and reverse bias in turning ON and OFF a switching transistor respectively. CONSTITUTION:When a transistor 2 is forward-biased by the current flowing to a resistance 7 and begins to be biased OFF, the base current flows to the transistor 2 by the voltage induced by a coil 3 and positive feedback action is brought about and the transistor 2 rapidly turns OFF. When the current flowing to the coil 3 gets to more than the designated value, flyback action is brought about to the coil 3, to which negative voltage is induced. Thus, the transistor 2 is reverse-biased and rapidly biased OFF.

4. 发明专利

JPS61196770A PROTECTING CIRCUIT OF CAPACITOR DISCHARGING CIRCUIT 失效
公开(公告)号：JPS61196770A
公开(公告)日：1986-08-30
申请号：JP3634085
申请日：1985-02-27
申请人： HITACHI LTD
发明人： KONO NAOFUMI , FUJIE TOSHIAKI
IPC分类号： H02H7/20 , G05F1/10 , H02M7/06 , H02M7/12
摘要： PURPOSE:To effectively detect the malfunction of a switch element by adding means for detecting a current flowed to a discharging resistor in a circuit for connecting the resistor with a capacitor in an electronic device only when the device is interrupted from a power source. CONSTITUTION:A transistor 11 is turned OFF by opening a power switch 14, and a relay 2 and photocouplers 8, 10 are turned OFF to disconnect an AC power source 1 from a rectifier. When the photocoupler 8 is turned OFF, a transistor 7 is turned ON to discharge a capacitor 4 through a resistor 5. If a current is flowed to the resistor 5 when a power switch 14 is closed to energize the relay 2 ON, a photocoupler 9 is turned ON, and an SCR 12 is triggered. Thus, the transistor 11 is turned OFF to deenergize the relay 2.

5. 发明专利

JPH04364365A SMALL POWER UNIT 失效
公开(公告)号：JPH04364365A
公开(公告)日：1992-12-16
申请号：JP13880891
申请日：1991-06-11
申请人： HITACHI LTD
发明人： KANOUDA TAMAHIKO , SATO MASAYOSHI , ONDA KENICHI , HAGIWARA SHUYA , MIZOGUCHI TETSURO , KONO NAOFUMI , FUJIKAWA KATSUMI , KINO JIRO
IPC分类号： H01F19/00 , H02M3/28 , H02M7/06 , H02M7/12
摘要： PURPOSE:To provide a power source which is suitable in promoting the miniaturization and the thinning of OA equipment and information equipment. CONSTITUTION:The thicknesses of a transformer and a smoothing reactor are made below 7mm by raising the switching frequency to 1MHz and constituting the transformer and the smoothing reactor, using a thin plate coil and a thin core. Moreover, for parts saving, a power switching element for controlling the output power, its drive circuit, a control circuit, and a protective circuit are integrated an block in a power IC which has breakdown strength of 250V or more. To materialize high power conversion efficiency, the on resistance of the power switching element is made 0.8OMEGA or less. Accordingly, the volume of the power unit can be made 10mm in thickness and 80mm in length, and the miniaturization and thinning of OA equipment and information equipment can be realized.

6. 发明专利

JPS62272863A SMOOTHING CHOKE MOUNTING STRUCTURE 失效
公开(公告)号：JPS62272863A
公开(公告)日：1987-11-27
申请号：JP11075286
申请日：1986-05-16
申请人： HITACHI LTD
发明人： NISHISU KOUJI , KONO NAOFUMI
IPC分类号： H02M1/14 , H01F27/24
摘要： PURPOSE:To control a pulse width stably by combining to use a core having a large gap length, which enables the increase of a DC superposed current, and a core having a small gap length. CONSTITUTION:A smoothing choke is furnished with a pair of positive and negative conductors 1, a core 2 having a large gap length and a core 3 having a small gap length, and said pair of conductors 1 are passed through a pair of through holes made in the cores 2, 3, respectively, to constitute said smoothing choke. Further, each terminal of a capacitor is connected with each of conductors 1 so that a smoothing circuit is formed with the cores 2, 3 side of the pair of conductors 1 as an input side and the capacitor side thereof as an output side. In this way, an electric current flows in the direction of the arrow and the pair of conductors 1 function as one turn of coil. Within the range where a DC superposed current is small, therefore, a synthetic inductance can be increased, a critical current of an output smoothing circuit can be decreased and a stable pulse width control can be performed.

7. 发明专利

JPS5944852B2 JPS5944852B2 - 失效
公开(公告)号：JPS5944852B2
公开(公告)日：1984-11-01
申请号：JP5118277
申请日：1977-05-06
申请人： Hitachi Ltd
发明人： MYAZAKI SHOICHIRO , KONO NAOFUMI , YAMAJI KIMINORI
IPC分类号： H02J1/00 , G05F1/10

8. 发明专利

JP2001075175A PROJECTION TYPE DISPLAY DEVICE 失效
公开(公告)号：JP2001075175A
公开(公告)日：2001-03-23
申请号：JP24814099
申请日：1999-09-02
申请人： HITACHI LTD
发明人： IGARASHI TAKESHI , YOSHIKAWA HIROKI , KOIZUMI NAOHISA , SUZUKI HITOSHI , KONO NAOFUMI
IPC分类号： G02B6/00 , G02F1/13 , G02F1/1335 , G02F1/13357 , G03B21/14
摘要： PROBLEM TO BE SOLVED: To provide a projection type display device capable of correcting irregular luminance caused by an optical system unit for processing pictures. SOLUTION: This device is provided with a backlight unit, plural transmission type display units arranged on the same plane by leaving a space in-between, a screen, and the optical system unit including a Fresnel concave lens and processing and projecting the pictures displayed on the plural transmission type display units so that they may be a continuous picture on the screen. The backlight unit is constituted so that light from a light source may be emitted from micro elements arrayed in an array state, and has distribution on the light passing effective area (effective area for taking the light passing through a light transmission body 3 from the light sources 4a to 4d in the micro prism 10 constituting the micro element, that is, the contact area of the prism 10 with the light transmission body 3) of the micro elements arrayed in the array state. Thus, the irregular luminance caused by the optical system unit is corrected.

9. 发明专利

JPH0746837A SWITCHING POWER SUPPLY 失效
公开(公告)号：JPH0746837A
公开(公告)日：1995-02-14
申请号：JP18963093
申请日：1993-07-30
申请人： HITACHI LTD
发明人： KONO NAOFUMI , MIZUKAMI TOSHIHIKO , MIZUTA KOICHI , TOKUNAGA KIICHI
IPC分类号： H02M3/28
摘要： PURPOSE:To increase reliability without providing a spare power supply outside, by a construction wherein a plurality of voltage converters are connected in parallel and each control command is transmitted to other voltage converters in common, while an internal output voltage of each voltage converter is monitored and the existence or nonexistence of a failure is informed to the outside. CONSTITUTION:A switching power supply 1 is constructed by connecting a plurality of DC-DC converters 2 in parallel. In the case when an output voltage fluctuates herein, a comparator part 23 of each DC-DC voltage converter 2 transmits a control voltage signal 24 to output voltage control parts 25 of the other DC-DC converters 2 through a transmission line 4 and the switching power source 1 as a whole outputs a prescribed output voltage by coordinated operations. In the case of a short-circuit accident, a fuse 3 is blown out and the failing DC-DC converter 2 is cut off. Moreover, a failure detecting circuit 5 monitors a state of operation of each DC-DC converter 2 on the basis of DC voltage signal 26 and delivers a maintenance request signal outside when it detects the failure.

10. 发明专利

JPS63302761A DC-DC CONVERTER 失效
公开(公告)号：JPS63302761A
公开(公告)日：1988-12-09
申请号：JP13869187
申请日：1987-06-02
申请人： HITACHI LTD
发明人： KONO NAOFUMI
IPC分类号： H02M3/335
摘要： PURPOSE:To suppress the generation of a leakage inductance, by fitting a first and a second capacitors on a space between the connecting points of the positive and negative poles of a DC power source and a first and a second transformers. CONSTITUTION:A DC-DC converter is provided with a DC power source Vi, a first-a second switching elements Tr1-Tr2, and a first-a second transformers T1-T2. In this case, to a space between the negative pole of the first transformer T1 and the positive pole of the DC power source Vi, and to a space between the positive pole of the second transformer T2 and the negative pole of the DC power source Vi, the same capacitors C1-C2 are respectively connected. By the capacitors C1-C2, the voltage of the DC power source Vi applied to both the transformers T1-T2 is divided. Then, the rectification or the like of the secondary current of the transformers T1-T2 is performed, and the output of DC output voltage V0 is generated. As a result, the ratio of a primary winding to a secondary winding can be suppressed to be diminished, and the generation of a leakage inductance can be suppressed.

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