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    • 92. 发明授权
    • Resonant power converter
    • 谐振电源转换器
    • US5909362A
    • 1999-06-01
    • US5950
    • 1998-01-12
    • Mark Adams
    • Mark Adams
    • H02M3/335
    • H02M3/33569Y02B70/1433
    • A resonant power converter holds energy within the circuit for a variable period to provide fixed-frequency, zero-voltage switching power conversion. A first switch alternately connects and disconnects a DC voltage source to one side of the primary winding of the transformer of a power converter. A second switch is connected between the other side of the primary winding and ground. A switch controller is responsive to the difference between a reference voltage and the voltage level present at the output of the circuit associated with the secondary winding of the transformer. Energy is added to the circuit while the first and second switches are closed. The first switch is then opened and energy is held in the circuit for a variable period of time to delay the beginning of resonance. Finally, both switches are opened and the energy within the circuit resonates. The energy holding period is adjusted as necessary to maintain a fixed frequency with varying loads. Accordingly, the switch controller is configured to open and close the first and second switches to maintain fixed-frequency operation of the power converter and switching of the second switch under zero-voltage conditions and in the presence of varying loads.
    • 谐振功率转换器在电路内保持可变周期的能量,以提供固定频率的零电压开关功率转换。 第一开关交流地将DC电压源连接并断开到功率转换器的变压器的初级绕组的一侧。 第二开关连接在初级绕组的另一侧和地之间。 开关控制器响应于参考电压与存在于与变压器的次级绕组相关联的电路的输出处的电压电平之间的差异。 当第一和第二开关闭合时,能量被加到电路中。 然后打开第一个开关,并将能量保持在电路中一段可变的时间段,以延迟共振开始。 最后,两个开关断开,电路内的能量共振。 根据需要调节能量保持周期,以保持具有变化负载的固定频率。 因此,开关控制器被配置为打开和关闭第一和第二开关以维持功率转换器的固定频率操作并且在零电压条件下以及存在变化的负载下切换第二开关。