Method and apparatus for high power pulse modulation
AssigneeMotorola, Inc.
InventorJohn E. Bjornholt
Life of this patent
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Abstract
A method and apparatus for high power pulse modulation which includes a high voltage supply to provide a high voltage input signal, and a drive channel, rise channel, fall channel, and dump channel. A timing system controls the switching of the drive channel, rise channel, fall channel, and dump channel to modulate the high voltage input signal to produce an output signal. Each channel comprises a channel logic input, buffer amplifier, alternating current (AC) coupler, isolation pulse transformer, current limiter, and switch to provide the pulse modulation. Power MOSFETs can be used as switches in the four channels.
Claims32
A high pulse repetition frequency (PRF), high power, four-channel pulse modulator comprising:
- high voltage supply means for providing a high voltage input signal;
- drive channel means for providing a drive channel component of an output signal coupled to the high voltage supply means;
- rise channel means for providing a rise channel component of the output signal coupled to the high voltage supply means and to the drive channel means at a first junction;
- fall channel means for providing a fall channel component of the output signal coupled to the high voltage supply means and to the rise channel means at the first junction;
- output means for providing the output signal coupled between the first junction and the electrical ground;
- dump channel means for providing a discharge path for the output means coupled between the first junction and an electrical ground;
- and
- timing means for modulating the high voltage input signal to produce the output signal coupled to the drive channel means, rise channel means, fall channel means, and dump channel means.
A four-channel, high pulse repetition frequency (PRF), magnetron modulator comprising:
- high voltage supply means for providing a high voltage input signal;
- drive channel means for providing a drive channel component of an output signal coupled to the high voltage supply means;
- rise channel means for providing a rise channel component of the output signal coupled to the high voltage supply means and to the drive channel means at a first junction;
- fall channel means for providing a fall channel component of the output signal coupled to the high voltage supply means and to the rise channel means at the first junction;
- output means for providing the output signal coupled between the first junction and the electrical ground;
- dump channel means for providing a discharge path for the output means coupled between the first junction and an electrical ground;
- and
- timing means for modulating the high voltage input signal to produce the output signal coupled to the drive channel means, rise channel means, fall channel means, and dump channel means.
A method for modulating a high voltage signal in a four-channel pulse modulator, comprising the steps of:
- inputting the high voltage signal to a drive channel;
- voltage dividing the high voltage signal;
- inputting the voltage divided high voltage signal to a rise channel and a fall channel;
- providing a dump channel;
- providing a rise channel timing pulse, drive channel timing pulse, fall channel timing pulse, and dump channel timing pulse to switch the rise channel, drive channel, fall channel, and dump channels, respectively;
- and
- switching the rise channel, drive channel, fall channel, and dump channel to modulate the high voltage signal.
Dependencies are inferred from the claim text.