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    • 3. 发明授权
    • Line operated fluorescent lamp inverter ballast
    • 线路式荧光灯逆变镇流器
    • US4459516A
    • 1984-07-10
    • US392004
    • 1982-06-25
    • William B. ZelinaFrancis J. Zelina
    • William B. ZelinaFrancis J. Zelina
    • H05B41/232H05B41/282H05B41/295H05B37/02
    • H05B41/2825H05B41/232H05B41/295
    • Applicant has provided a ballast circuit for fluorescent lights made up of the combination of (1) a source of electrical energy, (2) a resonant circuit, (3) a switch means for connecting the source of electricity to the resonant circuit, (4) means to connect the resonant circuit to a load, (5) a resonant current monitor controlling the switch means in synchronism with the resonant current so that the switch means switches the resonant current when the resonant current passes through zero.The resonant current monitor is a current transformer having a primary winding connected in series with the resonant circuit and two secondary windings connected to the bases of the two switching transistors in a two transistor inverter circuit at a polarity that will switch one of the transistors on and the other off at the time current passes through zero. This is the optimum time to switch the transistors since the current flowing through the transistors is passing through zero at that time and therefore the transistors operate at maximum efficiency and there are minimum switching losses and improves the efficiency of the circuit. The circuit will automatically adjust the switching frequency to the changed resonant frequency should the value of the inductor or the capacitor degrade and therefore change, and the switching losses will therefore be maintained at minimum.
    • 申请人提供了由(1)电能源组合的荧光灯镇流器电路,(2)谐振电路,(3)用于将电源连接到谐振电路的开关装置,(4) 意味着将谐振电路连接到负载,(5)谐振电流监视器,其与谐振电流同步地控制开关装置,使得当谐振电流通过零时,开关装置切换谐振电流。 谐振电流监视器是具有与谐振电路串联连接的初级绕组的电流互感器,并且在两个晶体管反相器电路中连接到两个开关晶体管的基极的两个次级绕组,其极性将切换晶体管之一和 当时电流通过零时,另一个关闭。 这是切换晶体管的最佳时间,因为流过晶体管的电流在此时通过零,因此晶体管以最大的效率工作,并且存在最小的开关损耗并提高了电路的效率。 如果电感器或电容器的值降低,电路会自动将开关频率调整到谐振频率的变化,因此变化,因此开关损耗将保持在最小。
    • 7. 发明授权
    • Failure compensation circuit with thermal compensation
    • 具有热补偿功能的故障补偿电路
    • US4792701A
    • 1988-12-20
    • US33543
    • 1987-04-01
    • Thomas E. OlonFrancis J. Zelina
    • Thomas E. OlonFrancis J. Zelina
    • H05B37/03H05B41/30
    • H05B37/03Y10T307/25
    • A failure compensation circuit automatically reduces the output voltage of a power supply when a portion of a load drops out. The compensation circuit includes a circuit for generating a control signal representative of the desired voltage across the load. A power supply supplies voltage to the load in response to the control signal. An input signal representative of the current delivered to the load is produced which decreases whenever a portion of the load drops out. The circuit for generating the control signal is responsive to the input signal for adjusting the control signal such that when the current delivered to the load decreases, the voltage delivered to the load is automatically reduced.
    • 故障补偿电路当负载的一部分掉电时自动降低电源的输出电压。 补偿电路包括用于产生表示跨过负载的期望电压的控制信号的电路。 电源根据控制信号向负载提供电压。 产生代表传送到负载的电流的输入信号,当负载的一部分掉出时,该信号减小。 用于产生控制信号的电路响应于用于调节控制信号的输入信号,使得当输送到负载的电流降低时,自动减小传送到负载的电压。