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1. 发明专利

JPS62290356A SWITCHING POWER SOURCE 失效
公开(公告)号：JPS62290356A
公开(公告)日：1987-12-17
申请号：JP13184986
申请日：1986-06-09
申请人： HITACHI LTD , HITACHI DEVICE ENG , HITACHI NISSHIN ELECTRON KK
发明人： OTAKA TERUAKI , TOKUNAGA KIICHI , AMANO HISAO , YAMATO IKUO , NOGUCHI SHOICHI
IPC分类号： H02M3/28
摘要： PURPOSE:To realize high efficiency, by a method wherein a circuit detecting valley portion time of oscillation voltage and a pulse generator are added, and a switching element is turned on at the valley portion of the oscillation voltage. CONSTITUTION:In a switching power source, input side of a transformer 2 and a switching element 3 are connected to both ends of an input power source 1, and a capacitor 4 is connected in parallel to the element 3. A rectifier circuit 5, a load 6, and a transformer reset discrimination circuit 7 are connected to output side of the transformer 2. The reset discrimination circuit 7 is connected through a delay circuit 8 and a pulse generator 9 to the switching element 3. In order to detect valley portion of oscillation voltage, since discrimination is performed by variation amount of current (voltage) within the circuit, this is detected and ON-command is transmitted from the pulse generator 9 to the switching element 3. As a result, the switching element 3 can be turned on at the valley portion of the oscillation voltage.

2. 发明专利

JPS62290353A SWITCHING POWER SOURCE 失效
公开(公告)号：JPS62290353A
公开(公告)日：1987-12-17
申请号：JP13185086
申请日：1986-06-09
申请人： HITACHI LTD , HITACHI NISSHIN ELECTRON KK , HITACHI DEVICE ENG
发明人： NOGUCHI SHOICHI , TOKUNAGA KIICHI , AMANO HISAO , YAMATO IKUO , OTAKA TERUAKI
IPC分类号： H02M3/28 , H01J23/34
摘要： PURPOSE:To decrease turn-off loss or the like, by a method wherein circuit constant is selected so that secondary circuit current becomes oscillatory, and ON-period of a switch is made a half period of the oscillation period or more. CONSTITUTION:A switching power source is composed of a DC power source 1, a transformer 2, a controllable switch 8, a control circuit 11, a diode 5, a capacitor 6 and the like. Stable output is supplied to a magnetron 7A as load, and when the controllable switch 8 is turned on by leakage inductance of the transformer 2 and capacitors 6A, 6B, current flowing through secondary circuit of the transformer 2 is made oscillatory and the switch current waveform at the turn-off time is made small. In this constitution, reduction of the switching loss and the applied voltage at the turn-off time of the controllable switch 8 can be attained.

3. 发明专利

JPS63304593A HIGH-FREQUENCY POWER SOURCE DEVICE FOR MAGNETRON 失效
公开(公告)号：JPS63304593A
公开(公告)日：1988-12-12
申请号：JP13876987
申请日：1987-06-02
申请人： HITACHI LTD , HITACHI DEVICE ENG
发明人： OTAKA TERUAKI , AMANO HISAO , MATSUDA YASUO , TOKUNAGA KIICHI , SATO MASAYOSHI
IPC分类号： H05B6/66 , H01J23/34
摘要： PURPOSE:To perform rapid heating of a heater at the beginning of power application so as to prevent a high voltage from being generated between an anode and a cathode, by setting an output level at the beginning of power application to be larger than a prescribed value and making a primary current flow in an input coil of a transformer for the longer hours, the larger the output level is set. CONSTITUTION:When a power source 1 is turned on, a controlling level for startup is set larger than a prescribed value by a controlling circuit 2 and then a switching element 3 is driven. The element 3 is controlled on and off so that a ratio of its on time to its off time is made large comparatively. Consequently a magnetron voltage becomes a voltage V2 which is larger than a steady value. As a frequency of a heating voltage of a heater is lowered, the voltage value is increased so that the current of the heater increases. The heater is heated rapidly to raise the temperature and to operate a magnetron 9 in a critical state. After the heater attains to the prescribed temperature, the magnetron 9 is operated in the steady state. After a prescribed time, an output level of the power source 1 is exchanged into a value smaller than the preset one by the use of a time setting circuit 10, and the element 3 is driven by the circuit 2 so as to obtain a corresponding output power.

4. 发明专利

JPS63257463A SWITCHING POWER SOURCE DEVICE 失效
公开(公告)号：JPS63257463A
公开(公告)日：1988-10-25
申请号：JP8878187
申请日：1987-04-13
申请人： HITACHI LTD , HITACHI DEVICE ENG
发明人： OTAKA TERUAKI , AMANO HISAO , MATSUDA YASUO , TOKUNAGA KIICHI , SATO MASAYOSHI
IPC分类号： H02M3/28
摘要： PURPOSE:To effect ON/OFF control stably, by a method wherein a predetermined timing before the intersection between an oscillating voltage, induced in the primary coil of a transformer, and zero level is caught to put a switching element ON while estimating the intersection to occur thereafter. CONSTITUTION:In a switching power source device, the primary coil 6a of a booster transformer 6 and a switching circuit 4 are connected to both terminals of a DC power source 1 in series while a resonance capacitor 5 is connected in parallel to the switching circuit 4. A transformer voltage detecting circuit 2 is connected to both terminals of the primary coil 6a of the booster transformer 6 and an ON/OFF control circuit 3 is connected to the output side of the voltage detecting circuit 2, further, the switching circuit 4 is connected to the output side of the control circuit 3. The booster transformer 6 is equipped with respective windings for a magnetron 8 at the output side thereof. According to this method, the switching circuit 4 may be turned OFF with a timing, at which an impressing voltage becomes zero, whereby a switching loss may be eliminated and the title device may be operated stably.

5. 发明专利

JPS63253878A SWITCHING POWER-SUPPLY DEVICE 失效
公开(公告)号：JPS63253878A
公开(公告)日：1988-10-20
申请号：JP8454787
申请日：1987-04-08
申请人： HITACHI LTD , HITACHI DEVICE ENG
发明人： SATO MASAYOSHI , TOKUNAGA KIICHI , AMANO HISAO , MATSUDA YASUO , OTAKA TERUAKI
IPC分类号： H02M7/537
摘要： PURPOSE:To control output smoothly and stably, by switching the pulsating voltage of output from a rectifier circuit, at high frequencies, to apply the voltage to a load, and by synchronizing this switching operation period with the pulsation of the voltage, to change the period. CONSTITUTION:So far as a switching power-supply device is concerned, the main circuit of a high frequency inverter is composed of a full-wave rectifier circuit 2, a transformer 3, a switching transistor 4, a regenerative diode, and a resonance capacitor 6, and current is fed to a magnetron 9 via voltage doubler circuits 7, 8 from the secondary winding 3b of said transformer 3. This controlling circuit is provided with a timing circuit 11, a synchronous pulse generating circuit 12, a waveform shaping circuit 13, a current averaging circuit 15, a high-frequency oscillating circuit 18, a working period controlling switch 19, a driving circuit 21, and the like. As a result, pulsating voltage applied to the magnetron 9 through the transistor 4 is driven by high frequency, and its working period is synchronized with the pulsating of voltage and is changed, and so output control can be stably performed.

6. 发明专利

JPS63194578A OSCILLATOR CIRCUIT 失效
公开(公告)号：JPS63194578A
公开(公告)日：1988-08-11
申请号：JP2458487
申请日：1987-02-06
申请人： HITACHI LTD , HITACHI DEVICE ENG
发明人： SATO MASAYOSHI , TOKUNAGA KIICHI , AMANO HISAO , MATSUDA YASUO , OTAKA TERUAKI
IPC分类号： H02M7/538
摘要： PURPOSE:To prevent uneven magnetization of an output transformer by controlling an OFF state of a transistor in an oscillator circuit through a transistor in a rush current prevention circuit. CONSTITUTION:An oscillator circuit is composed of a DC power 1, a power switch 2, transistors (hereinafter referred to as Tr)3-4, an output transformer 15 and others, and supplies a load with power via said output transformer 15 by turning ON and OFF Trs 3-4 alternately. Also, a rush current prevention circuit is composed of a Tr 19, diodes 20-21 and a resistor 22. In this case, the Tr 19 of said rush current prevention circuit is used for controlling an OFF state of the Trs 3-4. Thus, the Tr 19 is in an ON state in case of a steady-state operation of said oscillator circuit, but the Tr 19 is momentarily turned OFF at the point of time when said Tr 19 is to be turned OFF. If said Tr 19 is turned OFF, a collector current for the Tr 19 is decreased momentarily. Therefore, the Tr 3(4) turns OFF and the Tr 4(3) switches to ON.

7. 发明专利

JPS63194566A SWITCHING POWER SUPPLY 失效
公开(公告)号：JPS63194566A
公开(公告)日：1988-08-11
申请号：JP2458287
申请日：1987-02-06
申请人： HITACHI LTD , HITACHI DEVICE ENG
发明人： OTAKA TERUAKI , AMANO HISAO , MATSUDA YASUO , TOKUNAGA KIICHI , SATO MASAYOSHI
IPC分类号： H02M3/28
摘要： PURPOSE:To start stably by providing a starting control circuit pulsing an input voltage and a circuit detecting a valley voltage of said input voltage and by causing an apparatus to perform a switching operation from a point of time of detection of said valley voltage. CONSTITUTION:In a switching power supply, the input side of a rectifier bridge 2 is connected with both ends of a commercial power supply 1 and the primary winding 8 and switching element 7 of a transformer are connected with the output side of said rectifier bridge 2. Then, a control circuit 7 is connected with said element 7 and a valley voltage detection circuit 4 detecting a valley of output pulsating voltage of said bridge 2, with said control circuit. Said both circuits 4-5 are supplied with electricity by an auxiliary power circuit and provided with a starting control circuit 3. Thus, when an auxiliary power voltage attains a level at which the switching element 7 can be operated safely, and a valley voltage detection command is given from the valley voltage detection circuit 4, switching is started. As a result, an excessive rush current is prevented from flowing through the switching element 7.

8. 发明专利

JPS63257311A SELF OSCILLATING CIRCUIT 失效
公开(公告)号：JPS63257311A
公开(公告)日：1988-10-25
申请号：JP9072287
申请日：1987-04-15
申请人： HITACHI LTD , HITACHI DEVICE ENG
发明人： SATO MASAYOSHI , TOKUNAGA KIICHI , OTAKA TERUAKI , AMANO HISAO
IPC分类号： H02M7/538 , H03B5/12 , H03K3/30
摘要： PURPOSE:To eliminate the need for the selection of transistors (TRs) by increasing the discharge time constant of a series charge/discharge circuit more than the charging time constant so as to suppress partial magnetization of an output transformer thereby preventing the destruction of the TRs. CONSTITUTION:Diodes 13, 14 are connected in series with resistors 9, 10 and resistors 15, 16 having a larger resistance than that of the resistors 9, 10 are connected in parallel. Thus, the discharge time constant of the capacitors 7, 8 is increased. Then, the discharge voltage is increased and the passing time of a base current after a TR 4 is switched on is prolonged and the on-time of the TR 4 is extended. The on-time of other TR is decreased similarly based on the TR with a short on-time. Since the on-time of both the TRs 3, 4 is averaged in this way, the partial magnetization of an output TR 1 is suppressed.

9. 发明专利

JPS63194569A RESONANCE TYPE CONVERTER 失效
公开(公告)号：JPS63194569A
公开(公告)日：1988-08-11
申请号：JP2458387
申请日：1987-02-06
申请人： HITACHI LTD , HITACHI DEVICE ENG
发明人： OTAKA TERUAKI , AMANO HISAO , TOKUNAGA KIICHI , SATO MASAYOSHI , MATSUDA YASUO
IPC分类号： H02M3/28
摘要： PURPOSE:To perform starting and other operations stably by providing a circuit detecting a valley of pulsating input voltage of a resonance type converter and an oscillator circuit for a switching element. CONSTITUTION:In a switching power supply, a rectifier bridge 12 is connected with both ends of a commercial power supply 11; and a discharge circuit 13, with both ends of said rectifier bridge 12. Said discharge circuit 13 is capable of discharging a capacitor 17 and is inserted to pulse a voltage behind the rectifier bridge. Then, a valley voltage detection circuit 14 for pulsating voltage is connected with both ends of the rectifier bridge 12 and also with a switching element 16 via an oscillator circuit 15. Further, a primary side winding 18-1 of transformer 18 and the resonance capacitor 17 are connected in series with both ends of said bridge 12 and the switching element 16 is connected in parallel with said resonance capacitor 17, while an output power is outputted from a transformer secondary winding 18-2 to an external circuit. Thus, if oscillation of the oscillator circuit 15 is started at the valley point of a pulsating input voltage, said element can be prevented from destroying.

10. 发明专利

JP2002199708A DC-DC CONVERTER 失效
公开(公告)号：JP2002199708A
公开(公告)日：2002-07-12
申请号：JP2000390693
申请日：2000-12-22
申请人： HITACHI LTD
发明人： KANOUDA TAMAHIKO , ONDA KENICHI , TOKUNAGA KIICHI , SAGA RYOHEI
IPC分类号： H02M3/155 , H02M3/156 , H02M3/158
摘要： PROBLEM TO BE SOLVED: To enhance the efficiency of a dc-dc converter whose load current fluctuates significantly. SOLUTION: In a deboosting chopper type dc-dc converter, a power MOSFET is caused to have a high ON-resistance and is turned on, by applying a pulse train having a low peak value near threshold voltage to the MOSFET 2 in an intermediate load region. By doing this way, its output voltage is controlled by a PAM(pulse amplitude modulation) switching system, which makes the peak value lower than a source voltage.

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