System and method of cancelling noise radiated from a switch-mode power converter
AssigneeLockheed Martin Corporation
InventorAlain T. Pellen
Life of this patent
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Abstract
A switch-mode power converter comprises a converter circuit and an auxiliary switching circuit. The converter circuit comprises a storage component configured to temporarily store input energy; and at least one switch configured to control release of the stored energy from the storage component. The auxiliary switching circuit is coupled to the storage component, the auxiliary switching circuit comprising an auxiliary switch having a duty cycle that is approximately 180 degrees out of phase with the duty cycle of the at least one switch in the converter circuit such that the auxiliary switching circuit produces compensating noise which substantially cancels noise radiated from the converter circuit.
Claims20
A switch-mode power converter comprising:
- A converter circuit comprising:
- a storage component configured to temporarily store input energy;
- and
- at least one switch configured to control release of the stored energy from the storage component;
- and
- an auxiliary switching circuit coupled to the storage component, the auxiliary switching circuit comprising an auxiliary switch having a duty cycle that is approximately 180 degrees out of phase with the duty cycle of the at least one switch in the converter circuit such that the auxiliary switching circuit produces compensating noise which substantially cancels noise radiated from the converter circuit.
An auxiliary switching circuit comprising:
- a switch configured to switch open and closed;
- a capacitor configured to store energy when the switch is open and to provide energy to the auxiliary switching circuit when the switch is closed;
- a sensor configured to detect one or more characteristics of noise radiated by a switched mode converter circuit coupled to the auxiliary switching circuit;
- a control circuit configured to control current to the switch based on the one or more detected characteristics of the radiated noise such that the switch has a duty cycle that is approximately 180 degrees out of phase with a switch in the switched mode converter circuit;
- and
- a noise cancelling component coupled to the switch in the auxiliary switching circuit and configured to radiate compensating noise which substantially cancels the noise radiated from the switch-mode converter circuit.
A method of cancelling radiated noise in a switch-mode power converter, the method comprising:
- switching an auxiliary switch approximately 180 degrees out of phase with at least one switch in a switch-mode converter circuit;
- storing energy when the auxiliary switch is open;
- releasing the stored energy to the auxiliary switch when the auxiliary switch is closed;
- sensing one or more characteristics of noise radiated from the switch-mode converter circuit;
- and
- modifying current of the released energy based on the sensed one or more characteristics to radiate compensating noise which substantially cancels the noise radiated from the switch-mode converter circuit.
Dependencies are inferred from the claim text.