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Z-ARCHIVE-Energy Storage: Bidirectional Direct Current Converters
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Patent US10355526
Issued 2019-07-16
Bi-directional Inductive Power Transfer
A method, apparatus, and system are provided which enables the control of contactless power transfer in an inductive power transfer system using a phase control technique. The method comprises adjusting the phase of a secondary-side converter output voltage with respect to that of a primary-side converter. The magnitude of power transfer is determined by the relative phase angle, and the direction of power transfer is determined by whether the secondary converter output voltage leads or lags the input converter voltage, thereby enabling bi-directional power transfer between the primary and secondary sides of the system. According to alternative embodiments, the method may also be used for uni-directional power transfer only, and/or the secondary converter may be operated to maintain a constant relative phase angle.
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- 1. A control method for an inductive power transfer (IPT) system having a primary side comprising a primary converter and a primary resonant circuit, and a secondary side comprising a secondary converter and a secondary resonant circuit, the method comprising the steps of:
controlling a relative phase angle of the secondary converter with respect to the primary converter while maintaining the secondary resonant circuit tuning to be the same as the primary resonant circuit tuning to control a transfer of power between the primary side and the secondary side; and controlling a magnitude of power transfer by varying a secondary converter output voltage to maintain a required pickup output, wherein varying the secondary converter output voltage magnitude comprises varying a pulse width of the secondary converter output voltage.
- 8. A pickup for an inductive power transfer (IPT) system, the pickup comprising:
a phase detector for detecting an indication of a phase of a voltage in a primary conductive path with which the pickup is inductively coupled in use; a resonant circuit to receive power inductively from the primary conductive path; a converter allowing adjustable phase; and a controller adapted to control a power transfer between the primary conductive path and a load associated with the pickup, by controlling at least a phase angle of the converter with respect to that of the primary conductive path voltage while maintaining the resonant circuit tuning the same as a primary resonant circuit tuning and controlling a magnitude of power transfer by varying the converter output voltage to maintain a required pickup output, wherein varying the converter output voltage magnitude comprises varying a pulse width of the converter output voltage.
- 14. An inductive power transfer (IPT) system comprising:
a power supply adapted to control the alternating current in a primary conductive path; and at least one pickup inductively coupled with the primary conductive path in use and comprising a converter and a resonant circuit electrically coupled to a load, the pickup being adapted to control the relative phase angle of the converter output with respect to that of a the voltage in the primary conductive path while maintaining the resonant circuit tuning at the same as a primary resonant circuit tuning to control a transfer of power between the primary conductive path and the load and control a magnitude of power transfer by varying a converter output voltage to maintain a required pickup output, wherein varying the converter output voltage magnitude comprises varying a pulse width of the converter output voltage.
