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    • 7. 发明授权
    • Inverter parallel operation system
    • 变频并联运行系统
    • US06771522B2
    • 2004-08-03
    • US10457722
    • 2003-06-10
    • Hidetake HayashiHitoshi TakimotoTouru Yoshioka
    • Hidetake HayashiHitoshi TakimotoTouru Yoshioka
    • G09F170
    • H02M7/493H02M5/4505H02M5/451H02M5/4585H02P9/305
    • An inverter includes a DC power supply circuit, an inverter circuit having a plurality of switching elements and switching an output of the DC power supply circuit on the basis of a PWM signal to deliver a high-frequency voltage, a filter circuit converting the high-frequency voltage to a substantially sinusoidal AC voltage, a power detector detecting an effective or wattless power of the AC power, a phase angle calculator calculating a phase angle of current relative to voltage from the detected effective or wattless power, a phase detector detecting a leading or lagging state of the phase angle, and a controller decreasing a frequency of the output voltage when the phase detector detects the leading state of the phase angle, the controller increasing the frequency of the output voltage when the phase detector detects the lagging state of the phase angle.
    • 逆变器包括直流电源电路,具有多个开关元件的逆变器电路,并且基于PWM信号切换直流电源电路的输出以提供高频电压;滤波电路, 频率电压到基本正弦交流电压,功率检测器检测交流电源的有效或无功功率;相位角计算器,根据检测到的有效或无功功率计算电流相对于电压的相位角;相位检测器,检测前导 或相位角的滞后状态,以及当相位检测器检测到相位角的引导状态时控制器降低输出电压的频率,当相位检测器检测到相位角的滞后状态时,控制器增加输出电压的频率 相位角。
    • 8. 发明授权
    • High-frequency heating apparatus with wave guide switching means and
selective power switching means for magnetron
    • 具有波导开关装置的高频加热装置和用于磁控管的选择性电源开关装置
    • US5451751A
    • 1995-09-19
    • US006310
    • 1993-01-22
    • Hitoshi TakimotoKoji MurakamiTatsuya Nakagawa
    • Hitoshi TakimotoKoji MurakamiTatsuya Nakagawa
    • H05B6/66H05B6/80H05B6/72H05B6/78
    • H05B6/707H05B6/6411H05B6/72H05B6/76H05B2206/044
    • A high-frequency heating apparatus capable of heating uniformly a liquid load, having an economical wave guide switching unit and having a compact-sized and economical power circuit to drive a plurality of magnetrons. The high-frequency heating apparatus includes an excitation opening, provided at the bottom of a heating chamber for radiating microwaves to heat the liquid load in a container, a magnetron for generating the microwave to heat the object and a wave guide connected to a magnetron. The apparatus further includes a wave guide switching unity for switching the propagation of the microwave to one of plural wave guides. The switching unit includes a pair of circular conductive plates and a conductor disposed in the vicinity of a circumference of the circular conductive plate so as to shut off the microwave, wherein there is constructed a choke structure on the wave guide containing the circular conductive plates. The apparatus further includes a magnetron drive circuit including a filament heating power supply connected to each filament of the magnetrons, a high voltage generating element and a switching element for selectively supplying a high voltage from the high voltage generating element to an anode of the magnetrons.
    • 一种能够均匀地加热液体负荷的高频加热装置,具有经济的波导切换装置,并且具有小型经济的电力电路来驱动多个磁控管。 高频加热装置包括激励开口,设置在用于辐射微波的加热室的底部以加热容器中的液体负载,用于产生微波以加热物体的磁控管和连接到磁控管的波导。 该装置还包括波导切换单位,用于将微波的传播切换到多个波导中的一个。 切换单元包括一对圆形导电板和布置在圆形导电板的圆周附近的导体,以便切断微波,其中在波导上构成一个包含圆形导电板的扼流结构。 该装置还包括磁控管驱动电路,其包括连接到每个磁控管细丝的灯丝加热电源,高电压产生元件和用于选择性地将高电压从高电压产生元件提供给磁控管的阳极的开关元件。