Method and apparatus for magnetic amplifier to reduce minimum load requirement
August 15, 2021. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesStabilizing power supply apparatus Switch mode power supply having magnetically controlled output Power supplies with magnetic amplifier voltage regulation Magnetic amplifier DC-DC converter with saturable reactor reset circuit Circuit and method for regulating output voltage of a switch mode power supply having a current mode magnetic amplifier Regulated power supply and method Method and circuitry for controlling start-up characteristics of a magnetic amplifier control circuit Method and circuitry for controlling current reset characteristics of a magnetic amplifier control circuit Magnetic amplifier Patent #: 5689408 InventorApplicationNo. 931637 filed on 08/15/2001US Classes:363/17, Bridge type327/494, Bridge circuit363/19, With automatic control of the magnitude of output voltage or current363/91Saturable reactor (e.g., magnetic amplifier)ExaminersPrimary: Patel, Rajnikant B.Attorney, Agent or FirmInternational ClassesH02M 003/335H02M 005/42 AbstractThis invention provides a method and apparatus for magnetic amplifier to reduce the minimum load requirement of power supply. The apparatus comprises a voltage-dropper and a current-limiter. Through the voltage-dropper and the current-limiter, the master output of the power supply is coupled to the output of magnetic amplifier. The differential voltage of the master output and the magnetic amplifier output decide the voltage of the voltage-dropper. The current-limiter limits the current flows from the master output to magnetic amplifier output. If the master output is no load and the magnetic amplifier is full load condition, a start-up current will flow from the master output to the output of magnetic amplifier via the voltage-dropper and the current-limiter. In the mean time, the start-up current will widen the pulse width of the PWM signal until the current-limiter limits the current. The maximum current of the current-limiter is assigned to maintain the minimum pulse width of the PWM signal. This minimum pulse width of the PWM signal ensures that the output of the magnetic amplifier is inside the regulation.Field of SearchBridge typeHaving transistorized inverter With automatic control of the magnitude of output voltage or current Single-ended, separately-driven type For inverter With transistor control means in the line circuit For bridge-type inverter Saturable reactor (e.g., magnetic amplifier) With inductive control means in the line circuit In transistor inverter systems Bridge type Differential input Bridge circuit | |
