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    • 5. 发明授权
    • Voltage supply circuit
    • 电源电路
    • US6037761A
    • 2000-03-14
    • US126984
    • 1998-07-30
    • Gerald Hirmer
    • Gerald Hirmer
    • G06F1/26G05F1/12
    • G06F1/26
    • A voltage supply circuit for a CPU of a programmable controller is provided, the CPU receiving via the voltage supply circuit at least two supply voltages obtained from an input voltage. The circuit operates in a manner such that when the input voltage is increased from an open-circuit potential, a first supply voltage is received by the CPU as soon as the input voltage exceeds an upper input voltage threshold value. The second supply voltage is received by the CPU when the first supply voltage exceeds a primary supply voltage threshold value. When the input voltage decreases from a value (where both supply voltages are received by the CPU), the second supply voltage is no longer received by the CPU when the input voltage and drops below a lower input voltage threshold value, and also the first supply voltage is no longer received by the CPU as soon as the second supply voltage drops below a secondary supply voltage threshold value.
    • 提供了一种用于可编程控制器的CPU的电压供应电路,所述CPU经由所述电压供应电路接收从输入电压获得的至少两个电源电压。 电路的工作方式使得当输入电压从开路电位增加时,一旦输入电压超过上限输入电压阈值,CPU便接收到第一电源电压。 当第一电源电压超过初级电源电压阈值时,CPU接收第二电源电压。 当输入电压从CPU(两个电源电压都接收到)的值下降时,当输入电压下降到低于输入电压阈值以下时,第二电源电压不再被CPU接收,而第一个电源 一旦第二电源电压降至低于二次电源电压阈值,CPU就不再接收电压。