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1. 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.

2. 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.

3. 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.

4. 发明专利

JPH01292790A INVERTER POWER SUPPLY FOR MAGNETRON 失效
公开(公告)号：JPH01292790A
公开(公告)日：1989-11-27
申请号：JP11910988
申请日：1988-05-18
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： H05B6/68 , H03B11/10
摘要： PURPOSE:To prevent secondary damage of the other parts of a circuit by detecting a current flowing through the output winding of a transformer supplying high voltage to an anode of a magnetron and when the detected current value is larger than the reference value, the operation of an oscillation current driving a switching element is stopped. CONSTITUTION:A current value detector 7 is set up on the side of the output winding 3-2 of a transformer 3 so as to detect a momentary overcurrent due to a momentary short-circuit of a magnetron 6 and the self-heating of a high- tention capacitor 5-1. The then detected current value is compared with the reference value by a comparator 8 and when the reference value is exceeded, the comparator 8 is made to output for stopping the oscillation operation of an oscillation circuit 2 to control and drive the switching of a switching element 4 so as to stop supply to the transformer 3 of a high frequency AC. Thereby, secondary damage of the other circuit parts such as the switching element 4 can be prevented.

5. 发明专利

JPS6477895A ELECTRIC POWER SOURCE DEVICE FOR MAGNETRON 失效
公开(公告)号：JPS6477895A
公开(公告)日：1989-03-23
申请号：JP23224387
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： H05B6/66 , H02M3/28
摘要： PURPOSE:To make it possible to retain a fixed microwave output electric power of a magnetron by providing a multiplication circuit of outputs detected in a supply current detection circuit and an applied voltage detection circuit, furthermore, switchingly controlling a switching element so that the output of the multiplication circuit retains a desired assigned value. CONSTITUTION:An applied voltage detection circuit 7 and a supply current detection circuit 8 are provided to a DC high voltage output side obtained with high voltage generated in an output coil 2-2 of a transformer 2 rectified in a rectification circuit 5, and the output in both detection circuits is inputted in a multiplication circuit 9 to obtain an output signal proportional to a supply electric power to a magnetron 6. The output signal in the circuit 9 is compared to a desired level preset in a level setting unit 11 with a level comparator 10, and a control operation is conducted in a control circuit 4 with a switching element 3 driven. This enables a microwave oven to obtain a stable and desired microwave output with stable and given electric power supplied even when performance characteristic of a magnetron changes during operation.

6. 发明专利

JPH05198266A MAGNETRON 失效
公开(公告)号：JPH05198266A
公开(公告)日：1993-08-06
申请号：JP821492
申请日：1992-01-21
申请人： HITACHI LTD , HITACHI NISSHIN ELECTRON KK
发明人： AWANO TAKESHI , KANO KAZUO , OMURA KAZUYUKI , ISHIYAMA KUNIO
IPC分类号： H01J23/00 , H01J23/04
摘要： PURPOSE:To provide a highly reliable magnetron by forming a firmly deposited and hardly separable sintered body layer of metal powder for a getter on the surface of an end shield to support the cathode filament of a cathode body structure at both ends. CONSTITUTION:Pulverized metal 6 for a getter is sintered onto the surface of an end shield 2 to support both ends of a cathode filament at a ratio of 13 + or -6mg/cm .

7. 发明专利

JPH02144878A POWER SOURCE FOR DRIVING MAGNETRON 失效
公开(公告)号：JPH02144878A
公开(公告)日：1990-06-04
申请号：JP29813488
申请日：1988-11-28
申请人： HITACHI LTD , HITACHI NISSHIN ELECTRON KK
发明人： ISHIYAMA KUNIO , NOGUCHI SHOICHI
IPC分类号： H05B6/66 , H02M9/04
摘要： PURPOSE:To obtain the stable oscillation state and a long cathode life when the microwave output is adjusted in a relatively wide range by decreasing the average voltage applied to the cathode as the average voltage applied to the anode of a magnetron is increased. CONSTITUTION:The average voltage applied to a cathode is decreased as the average voltage applied to the anode of a magnetron 1 is increased. Dedicated inverter circuits and transformers 2 and 3 are provided for the anode voltage and the cathode voltage respectively, the conducting period of the anode inverter circuit and the cutoff period of the cathode power inverter circuit are made equal, and the cutoff period of the anode power inverter circuit and the conducting period of the cathode inverter circuit are made equal. The cathode current suitable for the output of the magnetron 1 can be fed, and a short cathode life caused by the excessively high cathode temperature at the maximum output of the magnetron 1 is prevented.

8. 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.

9. 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.

10. 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.

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