System for reducing the effects of power supply switching
First Claim
1. A DC power supply for providing power to a utilization device comprising:
- a source of AC power,rectifier means coupled to said source of AC power,a switching regulator coupled to said rectifier means and being responsive to switching pulses applied to a terminal, said switching regulator responding to the pulse width of said switching pulses to provide a DC voltage,a source of modulated pulses for providing modulated pulses to form said switching pulses, said modulated pulses and said switching pulses having a pulse repetition frequency that is continuously modulated over a selected frequency range,control means coupled to the terminal of said switching regulator and being responsive to said modulated pulses and a feedback voltage to provide said switching pulses having pulse repetition frequencies determined by said modulated pulses and pulse widths determined by said feedback voltage,a DC to AC converter coupled to said switching regulator for responding to said DC voltage,transformer means coupled to said DC and AC converter, andrectifier and filter means coupled between said transformer means and said utilization device and providing said feedback voltage.
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Accused Products
Abstract
A power supply arrangement that substantially eliminates the effects of the sidebands and harmonics at the switching frequency of the power supply on the RF carrier of an amplifier or other unit being supplied power. The switching frequency of the power supply arrangement is continuously varied in frequency at an appropriate rate and deviation with the result that a band of frequencies replaces the fundamental switching frequency of the power supply and all harmonics so that noise created by the switching frequency signal and the RF signal are then similarly diffused. The net power present as spurious noise in the amplifier unit is constant with the maximum amplitude of the noise as viewed, for example, in a doppler filter being substantially reduced. In a radar transmitter, for example, the transmitted pulse frequency appears as PRF sidebands of the CW frequency and the extraneous modulation from the switched power supply provides sidebands of the PRF sidebands. At each of these PRF sidebands, the switching frequency modulation, in accordance with the invention, causes the sidebands resulting from the switching frequency to be spread over a relatively wide band so as to substantially decrease the amplitude of the spurious signals.
49 Citations
6 Claims
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1. A DC power supply for providing power to a utilization device comprising:
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a source of AC power, rectifier means coupled to said source of AC power, a switching regulator coupled to said rectifier means and being responsive to switching pulses applied to a terminal, said switching regulator responding to the pulse width of said switching pulses to provide a DC voltage, a source of modulated pulses for providing modulated pulses to form said switching pulses, said modulated pulses and said switching pulses having a pulse repetition frequency that is continuously modulated over a selected frequency range, control means coupled to the terminal of said switching regulator and being responsive to said modulated pulses and a feedback voltage to provide said switching pulses having pulse repetition frequencies determined by said modulated pulses and pulse widths determined by said feedback voltage, a DC to AC converter coupled to said switching regulator for responding to said DC voltage, transformer means coupled to said DC and AC converter, and rectifier and filter means coupled between said transformer means and said utilization device and providing said feedback voltage. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification