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1. 发明专利

JPH0239554A HIGH FREQUENCY HEATING APPARATUS 失效
公开(公告)号：JPH0239554A
公开(公告)日：1990-02-08
申请号：JP18848988
申请日：1988-07-29
申请人： HITACHI LTD , HITACHI NISSHIN ELECTRON KK , HITACHI DEVICE ENG
发明人： NOGUCHI SHOICHI , ISHIYAMA KUNIO , OTAKA TERUAKI
IPC分类号： H05B6/66 , H01L23/29 , H01L23/31
摘要： PURPOSE:To prevent the occurrence of accidents such as short circuits and burning and to improve reliability by molding high voltage diodes with a flame retardant resin. CONSTITUTION:A flame-retardant epoxy-resin molded part 2 is formed so as to mold a high voltage diode 1 constituting a half-wave voltage doubler rectifier circuit and a high voltage diode 1 which is provided for blocking discharge current from a penetrating capacitor for magnetron all together. The thickness of the molding is determined so as to withstand a high voltage which is applied on the high voltage diodes 1. In this configuration, heat generated in elements is uniformly diffused, and cooling from the surrounding part is uniformly performed. Such points are considered. When the high voltage diode 1 is individually soldered on a printed board and used, an exposed lead 3. tends to become a discharge source in a conventional device. Since the lead 3 is molded in present invention, discharge is not generated. A distance between terminals 4 and a grounding lead 5 is sufficiently long, and discharge is hard to occur. Insulating property around the high voltage diodes in an adverse using environment is improved, and a highly reliable high frequency heating apparatus is obtained.

2. 发明专利

JPH01264192A POWER SOURCE FOR DRIVING MAGNETRON IN MICROWAVE OVEN 失效
公开(公告)号：JPH01264192A
公开(公告)日：1989-10-20
申请号：JP9148488
申请日：1988-04-15
申请人： HITACHI LTD , HITACHI NISSHIN ELECTRON KK , HITACHI DEVICE ENG
发明人： NOGUCHI SHOICHI , ISHIYAMA KUNIO , OTAKA TERUAKI
IPC分类号： H05B6/64 , H02M7/04 , H05B6/66
摘要： PURPOSE:To improve withstand voltage characteristics at the time of dew condensation by enclosing a capacitor and a diode in a single case for composing a rectifier circuit and sealing it with resin. CONSTITUTION:A high voltage capacitor 50 and a high voltage diode 60 for composing a rectifier circuit part of a power source for driving a magnetron connected with a diode 61 for prohibiting charge and discharge of a through capacitor of the magnetron by means of a connecting part 2 are contained in a case 1, then sealing resin 3 is filled in the case 1 to enclose and seal these high voltage circuit elements in the case 1, and only extended terminals (a), (b), (c) are taken out of the case 1. Direct exposure of these high voltage circuit elements to open air can thus be prevented, and the surface of the elements are prevented from direct dew condensation, thereby withstand voltage characteristics of a power source circuit for driving a magnetron can be improved much.

3. 发明专利

JPH01234053A POWER SUPPLY FOR DRIVING MAGNETRON 失效
公开(公告)号：JPH01234053A
公开(公告)日：1989-09-19
申请号：JP5830188
申请日：1988-03-14
申请人： HITACHI LTD , HITACHI DEVICE ENG , HITACHI NISSHIN ELECTRON KK
发明人： ISHIYAMA KUNIO , OTAKA TERUAKI , NOGUCHI SHOICHI
IPC分类号： G05F1/00 , H02M3/28 , H02M7/493
摘要： PURPOSE:To improve the output controllability of an apparatus, by using a plurality of inverter power circuits having a low output capacity and by parallel- operating said power circuits. CONSTITUTION:A power supply is provided with a rectifier 1, a capacitor 2, a high-voltage transformer 3, a switching element 4, and high voltage diodes 5-6 to supply power to a magnetron 7 as a load. Then, for example, two inverter circuits No.1 and No.2 are connected in parallel with each other to form a power circuit to drive a 1kW magnetron 7.

4. 发明专利

JPH02181345A MAGNETRON 失效
公开(公告)号：JPH02181345A
公开(公告)日：1990-07-16
申请号：JP37989
申请日：1989-01-06
申请人： HITACHI LTD , HITACHI NISSHIN ELECTRON KK , HITACHI DEVICE ENG
发明人： NOGUCHI SHOICHI , ISHIYAMA KUNIO , SATO HIDEYUKI , YAMADA HIRONOBU
IPC分类号： H01J23/00
摘要： PURPOSE:To reduce the width size of a ventilating duct by attaching a plurality of cooling plate to a cooling fin with the cooling face thereof formed parallel to the ventilating direction of the duct. CONSTITUTION:A plurality of cooling plates 13 are attached to a cooling fin 12 with the cooling face thereof formed parallel to the ventilating direction 14 of a ventilating duct 10. The cooling plate 13 can easily be formed only by cutting the plural parts of the cooling fin 12 at a right angle. Accordingly, a part of cooling air flowing between the fin 12 and not in contact with the fin 12 is brought into contact with the cooling plate 13 so that heat generated in an anode 1 can be eliminated effectively. Therefore, the width size of the ventilating duct 10 can be reduced.

5. 发明专利

JPH01264194A INVERTER POWER SOURCE FOR MAGNETRON 失效
公开(公告)号：JPH01264194A
公开(公告)日：1989-10-20
申请号：JP9148388
申请日：1988-04-15
申请人： HITACHI LTD , HITACHI DEVICE ENG CO LTD , HITACHI NISSHIN ELECTRON KK
发明人： OTAKA TERUAKI , ISHIYAMA KUNIO , NOGUCHI SHOICHI
IPC分类号： H05B6/68
摘要： PURPOSE:To make it possible to restrict abnormal heating of a coil of a filter by detecting a larger high frequency voltage generated at the time of abnormality where a capacitor connected with the transformer side for a low pass filter is broken to be open and stopping opening/closing action of a switching mechanism. CONSTITUTION:A means 12 for detecting a terminal voltage of capacitors 4, 5 connected with the transformer side of a low pass filter and a means 11 for determining if a detected voltage value is normal or abnormal are provided, and when it is determined to be abnormal, a generation circuit 10 is stopped. When the capacitors 4, 5 are normal, a high frequency voltage between the capacitor terminals is not large if high frequency current is going, but if the capacitors are broken and open, a large high frequency voltage appears between the capacitor terminals. In case the detected high frequency voltage value is over a predetermined standard value, it is determined to be abnormal (where the capacitors are broken and open), and opening/closing action of a switching mechanism 7 of an inverter circuit is stopped. Abnormal heating and burn of a coil can thus be prevented preliminarily.

6. 发明专利

JPS6482485A COOKING UTENSIL 失效
公开(公告)号：JPS6482485A
公开(公告)日：1989-03-28
申请号：JP23873087
申请日：1987-09-25
申请人： HITACHI LTD , HITACHI DEVICE ENG , HITACHI NISSHIN ELECTRON KK
发明人： ISHIYAMA KUNIO , OTAKA TERUAKI , NOGUCHI SHOICHI
IPC分类号： H05B6/12 , H05B6/64 , H05B6/66
摘要： PURPOSE:To reduce the cost by providing a magnetic path common to an induction heating coil and a magnetron power source transformer and allowing the induction heating coil to concurrently serve as the primary coil of the magnetron power source transformer. CONSTITUTION:A magnetic path common to an induction heating coil 4 used for an electromagnetic cooking utensil and coils 8 and 9 of a magnetron power source transformer 11 used for generating induction heating microwaves of a microwave oven is provided, and the induction heating coil 4 is allowed to concurrently serve as the primary coil of the magnetron power source transformer 11. When the electromagnetic cooking utensil and the microwave oven are to be integrated, the number of components of an inverter type power source used in common can be decreased and the cost can be reduced.

7. 发明专利

JPH01107491A HIGH FREQUENCY HEATING DEVICE 失效
公开(公告)号：JPH01107491A
公开(公告)日：1989-04-25
申请号：JP26382187
申请日：1987-10-21
申请人： HITACHI LTD , HITACHI NISSHIN ELECTRON KK , HITACHI DEVICE ENG
发明人： NOGUCHI SHOICHI , ISHIYAMA KUNIO , OTAKA TERUAKI
IPC分类号： H05B6/68
摘要： PURPOSE:To make a current transformer compact and light and simplify a current value detecting circuit by providing a means to detect an AC output current of the secondary side high voltage coil of a transformer, clipping the positive side or negative side of the output of this means and controlling a current to a magnetron to be a desired value. CONSTITUTION:A current transformer 60 of a current detecting means for a high voltage circuit is connected at a position nearer to a transformer 20 than a diode 60 so as to make it possible to measure the AC output current of the secondary side high voltage coil of the transformer 20. This makes the current on the primary side of the current transformer 60 to be AC, so the need of considering saturation of the magnetic circuit of the current transformer is eliminated, and the current transformer 60 which is compact and light can be used. By connecting diodes D1, D2 to each end of the secondary coil to clip the positive or negative side of the output, the current value detecting circuit can be simplified.

8. 发明专利

JPS6477473A SWITCHING POWER SUPPLY 失效
公开(公告)号：JPS6477473A
公开(公告)日：1989-03-23
申请号：JP23224587
申请日：1987-09-18
申请人： HITACHI LTD , HITACHI DEVICE ENG , HITACHI NISSHIN ELECTRON KK
发明人： OTAKA TERUAKI , ISHIYAMA KUNIO , NOGUCHI SHOICHI
IPC分类号： H02M3/28
摘要： PURPOSE:To reduce power consumption, and to improve efficiency by operating a starting circuit only at time of starting. CONSTITUTION:When a power supply is turned ON, a detector 8 transmits an ON signal over a sub-switching element 9, and a smoothing capacitor 6 is charged through a resistor 7. When the smoothing capacitor 6 is further charged and voltage reaches a value where a controlling circuit 4 can be operated normally, an oscillation signal is transmitted from the controlling circuit 4. When the oscillation signal is detected by the oscillation detector 8, an OFF signal is sent to the sub-switching element 9, and the charge of the smoothing capacitor 6 through the resistor 7 is stopped. Subsequently, the smoothing capacitor 6 is supplied with AC voltage generated in a winding 2-2 for an auxiliary power in a transformer 2 through a rectifier diode 5.

9. 发明专利

JPS6414846A TRANSFORMER FOR MAGNETRON POWER SUPPLY DEVICE 失效
公开(公告)号：JPS6414846A
公开(公告)日：1989-01-19
申请号：JP16870087
申请日：1987-07-08
申请人： HITACHI LTD , HITACHI DEVICE ENG , HITACHI NISSHIN ELECTRON KK
发明人： OTAKA TERUAKI , ISHIYAMA KUNIO , NOGUCHI SHOICHI
IPC分类号： H01J23/14 , H01J23/34
摘要： PURPOSE:To stabilize electric power supply to a heater and eliminate a choke coll by specifying a degree of coupling between an input winding and an auxiliary power supply, between an anode winding and a heater winding, between the input winding and the anode winding and between the input winding and the heater winding, respectively in a transformer. CONSTITUTION:A degree of coupling is taken at 0.9 or more between the input winding of a transformer 5 and the winding of an auxiliary power supply for a control circuit 2 and the like to drive a switching element 3, and between an anode winding and a heater winding, respectively. Also, a degree of coupling is taken at 0.7 or below between the input winding and the anode winding, and between the input winding and the heater winding, respectively. More concretely, a two-leg core is used as the magnetic core of the transformer 5. And the input winding and the auxiliary power supply winding are applied to one of the two legs, and the anode winding and the heater winding are applied to the other leg. Or an E-E core is used and the intermediate leg of one E-core is applied with the input winding and the auxiliary power supply winding, while the anode winding and the heater winding are applied to the intermediate leg of the other E-core. In this case, leak inductance due to rough coupling is used as a substitute for a choke coll, thereby enabling the elimination of the choke coil.

10. 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.

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