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1. 发明专利

JPS6435647A DATA PROCESSING SYSTEM 失效
公开(公告)号：JPS6435647A
公开(公告)日：1989-02-06
申请号：JP19008087
申请日：1987-07-31
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG , HITACHI ENG CO LTD
发明人： IWASAKI KAZUHIKO , KAWASAKI IKUYA , FUNABASHI TSUNEO , INAYOSHI HIDEO , HASEGAWA ATSUSHI , YAGINUMA TAKAO , KONDO EIKI
IPC分类号： G06F9/38 , G06F15/16
摘要： PURPOSE:To enable transfer between a memory and a CP through one bus cycle by adding a coprocessor space signal (CPS) and a coprocessor cycle signal (CPCYCL) or a command transfer cycle signal (AT2-0) to a coprocessor in addition to an ordinary memory access signal of a microprocessor. CONSTITUTION:When the microprocessor MPU1 fetches an instruction, which a coprocessor CP should process, it transmits an instruction CPS corresponding to this to the CP. At such a time, it transmits the AT2-0, showing that is is the bus cycle to transfer the instruction to the CP as well to the CP together with the instruction. In case of an operand is transferred from the memory 3 to the CP, the MPU1 asserts the signal CPYCL, showing the effectiveness of CP data in addition to the signal of ordinary memory read, and instructs the CP to fetch the data, and performs the transfer between the memory and the CP. In case of the data is transferred from the CP to the memory, the MPU asserts the CPCYCL signal, and instructs the CP to output the data to perform the transfer.

2. 发明专利

JPS62214464A COPROCESSOR COUPLING SYSTEM 失效
公开(公告)号：JPS62214464A
公开(公告)日：1987-09-21
申请号：JP5684486
申请日：1986-03-17
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG , HITACHI ENG CO LTD
发明人： IWASAKI KAZUHIKO , FUNABASHI TSUNEO , KAWASAKI IKUYA , INAYOSHI HIDEO , HASEGAWA ATSUSHI , YAGINUMA TAKAO , KONDO EIKI
IPC分类号： G06F15/16 , G06F9/38 , G06F15/167
摘要： PURPOSE:To transfer data between a memory and a coprocessor CP in one bus cycle by adding CPS and CPCYCL pins besides memory access signal pins of a microprocessor to select the CP simultaneously with memory access. CONSTITUTION:When an operand is transferred from a memory 3 to a CP 2, a microprocessor (MPU) 1 asserts not only a memory read signal but also a signal (CPCYCL) indicating the validity of coprocessor data and instructs the CP 2 to take in data, and the operand is transferred from the memory to the CP in one bus cycle. When data is transferred from the CP 2 to the memory 3, the MPU 1 asserts not only a memory write signal but also the signal (CPCYCL) and instructs the CP 2 to output data, and the data is transferred from the CP 2 to the memory 3 in one bus cycle.

3. 发明专利

JPH0578863B2 失效
公开(公告)号：JPH0578863B2
公开(公告)日：1993-10-29
申请号：JP5684486
申请日：1986-03-17
申请人： HITACHI LTD , HITACHI MICRO SYSTEM KK , HITACHI ENG CO LTD
发明人： IWASAKI KAZUHIKO , FUNABASHI TSUNEO , KAWASAKI IKUYA , INAYOSHI HIDEO , HASEGAWA ATSUSHI , YAGINUMA TAKAO , KONDO EIKI
IPC分类号： G06F15/16 , G06F9/38 , G06F15/167

4. 发明专利

JPS63184135A ELEMENTARY FUNCTION ARITHMETIC UNIT 失效
公开(公告)号：JPS63184135A
公开(公告)日：1988-07-29
申请号：JP22565687
申请日：1987-09-09
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： KONDO EIKI , MORINAGA SHIGEKI , YAGINUMA TAKAO , ASAI TAKESHI
IPC分类号： G06F7/544 , G06F17/17
摘要： PURPOSE:To perform calculation with high accuracy with a comparatively few number of iteration, by performing iteractive calculation by assembling an error correction equation in a convergence calculating equation. CONSTITUTION:The initial values (a0, b0, and c0) of the argument and two constants of an elementary function to be found are inputted to computing elements 100, 101, and 103. Those computing elements perform n-times of sequen tial iterative calculation based on relative equations (ai+1=ai+ or -bi.deltai), (bi+1=bi+ or -ai.deltai), and (ci+1=ci+ or -cRi). The deltai is an arbitrary variation, and the cRi is the constant corresponding to the number of iteration, and they are stored in the memory 103 in advance. In a process of iteration, the value of the bi or the ci is inputted to a controller 104, and whether the calculation for (n+1)-times of the computing element are addition or subtraction is con trolled by a control signal (a) corresponding to the elementary function to be found. After n-times of iteration, arithmetic calculation of (dn=bn-m.an.cn) or (dn=cn+bn/an) is performed by a computing element 106, then, an elementary function value dn can be outputted.

5. 发明专利

JPH07154967A DC-DC CONVERTER AND COMPUTER USING IT 失效
公开(公告)号：JPH07154967A
公开(公告)日：1995-06-16
申请号：JP23877094
申请日：1994-10-03
申请人： HITACHI LTD
发明人： YAGINUMA TAKAO , ONDA KENICHI , MATSUDA YASUO , MIZUTA KOICHI
IPC分类号： H02M3/28 , H02M3/335 , H03K17/16
摘要： PURPOSE:To reduce a switching loss by a method wherein, when a switching element is turned off, a snubber capacitor is connected in parallel with the switching element and a capacitor is connected in series with the snubber capacitor in such a way that individual electrodes are of an additive polarity. CONSTITUTION:Single-chip forward converters 34-1, 34-2 which supply electric power to a load 33 from a transformer are connected to capacitors 4-1, 4-2. Then, in the converters 34-1, 34-2, snubber capacitors 5-1,to 5-4 are connected in parallel with the switching elements 5-1 to 5-4 when the switching elements 5-1 to 5-4 are turned off, and the capacitors 4-1, 4-2 are connected in series with the snubber capacitors 7-1, 7-2 in such a way that individual electrodes are of an additive polarity. Thereby, it is possible to obtain the DC-DC converter whose switching loss is reduced, whose overlap period on the secondary side of the transformer is shortened, whose dead time for prevention of the short circuit of a power supply is reduced, whose high frequency is realized and which can be miniaturized.

6. 发明专利

JPH0327772A DC-DC CONVERTER AND ELECTRONIC COMPUTER USING THE SAME 失效
公开(公告)号：JPH0327772A
公开(公告)日：1991-02-06
申请号：JP15678889
申请日：1989-06-21
申请人： HITACHI LTD
发明人： YAGINUMA TAKAO , ONDA KENICHI , MATSUDA YASUO , MIZUTA KOICHI
IPC分类号： G06F1/26 , H02J1/10 , H02M3/28 , H02M3/335 , H02M3/337 , H03K17/16
摘要： PURPOSE:To make the efficiency of apparatus higher by juxtaposing snubber capacitors with switching elements, when the switching elements are turned OFF, and by causing power capacitors to intervene, when the switching elements are turned ON. CONSTITUTION:A DC-DC converter is composed of power-dividing capacitors 4, MOS-FETs 5, diodes 6, output smoothing reactors 11, an output smoothing capacitor 12, etc., to supply a load 33 with power. Also, the converter is provided with snubber circuits 1, of which snubber capacitors 7 are parallel- connected with the FETs 5, when the FETs 5 are turned OFF. Likewise, the snubber capacitors 7 are serially connected with the power-dividing capacitors 4, when the FETs 5 are turned ON.

7. 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

8. 发明专利

JPH0284058A RESONANCE TYPE POWER SUPPLY AND HEAT-SENSITIVE PRINTER USING SAME 失效
公开(公告)号：JPH0284058A
公开(公告)日：1990-03-26
申请号：JP23465988
申请日：1988-09-19
申请人： HITACHI LTD
发明人： SUZUKI YASUAKI , TSUMURA MAKOTO , HORI YASURO , ONDA KENICHI , YAGINUMA TAKAO
IPC分类号： H02M3/28 , B41J2/375
摘要： PURPOSE:To cut OFF a power source without breaking a switching element even at the time of a heavy load, etc., by providing a voltage control means restricting an output voltage based on a power cut-OFF command signal to be inputted and also by providing a power cut-OFF means turning OFF a switching element involved in the resonance of a transformer primary circuit. CONSTITUTION:In a voltage control means, a transistor TrQ2, to which a power cut-OFF command signal S1 is inputted, and TrQ3 are turned ON; an electric current flows from a controlling winding L5 via a resistor R11 to control windings LC1 and LC2 in the direction opposite to that of load current 12; saturable reactors L8, L9 are brought to a state of high inductance; an output power E4 is restricted; and a load current ID reaches zero. In a power cut-OFF means, then, the output voltage E4 of a main winding L4 at the point of time t1 becomes zero at the time t2. When a terminal voltage E6 reaches a specified voltage at the time t2, a Zener diode 3 operates to turn ON a photothyristor PS, the gate voltage of a switching element F1 becomes zero, resonance is stopped, and a power source is cut OFF.

9. 发明专利

JPS6026460A OVERCURRENT PROTECTING CIRCUIT OF GATE TURN-OFF THYRISTOR 失效
公开(公告)号：JPS6026460A
公开(公告)日：1985-02-09
申请号：JP13103683
申请日：1983-07-20
申请人： HITACHI LTD
发明人： YAGINUMA TAKAO , FUKUI HIROSHI , KIMURA ARATA
IPC分类号： H02M1/06
摘要： PURPOSE:To obtain a protecting circuit of small size and low cost by detecting the overcurrent by the anode voltage of a GTO in an overcurrent protecting circuit of the GTO. CONSTITUTION:An overcurrent detecting circuit 20 of a GTO1 is formed of a comparator 5, and AND circuit 7, and a timer 8. The overcurrent protecting circuit of the GTO1 is composed of the circuit 20, and the anode voltage of the GTO1 and a reference voltage Vref for judging the overcurrent flowing state are compared by a comparator 5. The logic product of a firing signal generator 6 for outputting a high level signal only when the gate firing signal SON of the GTO1 is generated and the output of the comparator 5 is obtained by an AND circuit 7, and the output continuing time is measured by a timer 8. When the measured time reaches the prescribed time, it generates an OFF gate signal SOFF. An OFF gate current IOFF is supplied from an OFF gate controller 4 by the signal SOFF.

10. 发明专利

JPS6016171A OVERCURRENT PROTECTING CIRCUIT OF GATE TURN-OFF THYRISTOR 失效
公开(公告)号：JPS6016171A
公开(公告)日：1985-01-26
申请号：JP12335483
申请日：1983-07-08
申请人： HITACHI LTD
发明人： YAGINUMA TAKAO , FUKUI HIROSHI , KIMURA ARATA
IPC分类号： H02M1/06
摘要： PURPOSE:To protect a GTO against an overcurrent by a small-sized and inexpensive circuit by detecting the overcurrent by the state of the anode voltage of the GTO and flowing an OFF gate current to the GTO to extinguish it. CONSTITUTION:The anode voltage of a GTO is raised when the GTO generates an overcurrent, and the state of the prescribed level or higher is continued. When in this state (overcurrent state), a diode D2 is reversely biased, and a capacitor C1 is charged continuously. Therefore, the voltage of the capacitor C1 is raised, and when it reaches the prescribed level, a Zener diode D1 is conducted, and a transistor Tr1 is turned ON. Thus, an OFF gate current is flowed, and the GTO is turned OFF.

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