Voltage detection circuits for a-c power supplies
AssigneeNippon Electric Co., Ltd.
InventorsTakuichi Tsuchiya, Hiroshi Togo
Life of this patent
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Abstract
A power supply control circuit is especially useful for a traveling wave tube, although it may also be used anyplace where desirable. An a-c power voltage is supplied to an input of the control circuit, where its frequency is multiplied to become a voltage having a period which is no greater than the duration of a power voltage fluctuation which might damage the traveling wave tube, unless corrected. The wave form of the multiplied frequency is shaped to provide a comparison voltage wave form, which is compared with a reference voltage. The a-c power voltage applied to said traveling wave tube is controlled responsive to the output of the comparison means.
Claims12
A voltage detection circuit for an a-c power supply for a traveling wave tube, said voltage detection circuit comprising means for frequency-multiplying an a-c signal from said a-c power supply, means for rectifying the output of said frequency-multiplying means, means for smoothing the output of said rectifying means, and voltage comparison means for comparing the output voltage of said smoothing means with a predetermined reference voltage to provide a control signal responsive to the comparison at the output of said detection circuit.
A method of controlling electrical a-c power supplies which supply an a-c output having a predetermined frequency for a traveling wave tube, said method comprising the steps of:
- a. receiving the a-c output;
- b. multiplying the frequency of said received a-c output to provide a signal having a frequency which is higher than said predetermined frequency;
- c. converting said multiplied frequency to a control voltage signal having amplitude fluctuations corresponding to fluctuations in the a-c output;
- d. comparing the voltage of said control voltage signal with a reference voltage;
- and
- e. signalling differences exceeding a predetermined level responsive to said comparison.
A power supply control circuit for a traveling wave tube, said circuit comprising means for supplying an a-c input signal to an input of said control circuit, means in said control circuit responsive to said a-c input signal for multiplying the frequency of said a-c input to provide a signal having a frequency which is no lower than the frequency of a power voltage fluctuation which may damage said traveling wave tube, means for shaping said multiplied frequency to provide a comparison voltage wave form, means for comparing said comparison wave form with a reference voltage, and means responsive to said comparing means for giving a signal to control an a-c power voltage applied to said traveling wave tube.
Dependencies are inferred from the claim text.