Power transfer system
First Claim
1. A power transfer system for transferring power from an AC supply outputting a first AC voltage comprising;
- a controller,a matrix converter having a positive primary coil node and a negative primary coil node and defining a first primary node and a second primary node and coupled to the AC supply for converting the first AC voltage to a second AC voltage,a primary coil connected between said positive primary coil node and said negative primary coil node of said matrix converter for producing an alternating magnetic field in response to receiving the second AC voltage from said matrix converter,a secondary coil in communication with said primary coil for producing an induced AC voltage in response to receiving the alternating magnetic field from said primary coil,a secondary rectifier connected to said secondary coil for rectifying the induced AC voltage from said secondary coil to produce a secondary DC voltage,characterized bysaid matrix converter including a first bidirectional switching module coupled to said controller and connected between said first primary node and said positive primary coil node and a second bidirectional switching module coupled to said controller and connected between said positive primary coil node and said second primary node,said controller configured to control said first bidirectional switching module and said second bidirectional switching module of said matrix converter to produce the second AC voltage at a desired level and at a desired output operating frequency and maintain the secondary DC voltage at a predetermined level,said secondary rectifier being of the voltage doubling type and having a positive secondary coil node and a negative secondary coil node and defining a first secondary node and a second secondary node and including a first rectifier diode coupled to said secondary coil and connected to said first secondary node and a second rectifier diode connected to said second secondary node and coupled to said secondary coil at said positive secondary coil node and including a first rectifier capacitor connected between said first secondary node and said negative secondary coil node and a second rectifier capacitor connected between said negative secondary coil node and said second secondary node for rectifying and doubling the induced AC voltage from the secondary coil to produce the secondary DC voltage, anda first primary coil tuning capacitor connected between said first primary node and said negative primary coil node and a second primary coil tuning capacitor connected between said second primary node and said negative primary coil node and a secondary coil tuning capacitor connected between said secondary coil and said positive secondary coil node for tuning resonance between said primary coil and said secondary coil.
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Accused Products
Abstract
A power transfer system and method are provided for transferring power from an AC supply outputting a first AC voltage. The system includes a controller and a matrix converter coupled to the AC supply for converting the first AC voltage to a second AC voltage. A primary coil is connected to the matrix converter and a secondary coil is in communication with the primary coil for producing an induced AC voltage. A secondary rectifier is connected to the secondary coil for rectifying the induced AC voltage to produce a secondary DC voltage. A sensor is coupled to the secondary rectifier and to the controller for monitoring the secondary DC voltage and outputting a proportional signal. The controller is configured to control the matrix converter producing a desired second AC voltage at a desired operating frequency and maintain a predetermined secondary DC voltage in response to the signal from the sensor.
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Citations
17 Claims
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1. A power transfer system for transferring power from an AC supply outputting a first AC voltage comprising;
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a controller, a matrix converter having a positive primary coil node and a negative primary coil node and defining a first primary node and a second primary node and coupled to the AC supply for converting the first AC voltage to a second AC voltage, a primary coil connected between said positive primary coil node and said negative primary coil node of said matrix converter for producing an alternating magnetic field in response to receiving the second AC voltage from said matrix converter, a secondary coil in communication with said primary coil for producing an induced AC voltage in response to receiving the alternating magnetic field from said primary coil, a secondary rectifier connected to said secondary coil for rectifying the induced AC voltage from said secondary coil to produce a secondary DC voltage, characterized by said matrix converter including a first bidirectional switching module coupled to said controller and connected between said first primary node and said positive primary coil node and a second bidirectional switching module coupled to said controller and connected between said positive primary coil node and said second primary node, said controller configured to control said first bidirectional switching module and said second bidirectional switching module of said matrix converter to produce the second AC voltage at a desired level and at a desired output operating frequency and maintain the secondary DC voltage at a predetermined level, said secondary rectifier being of the voltage doubling type and having a positive secondary coil node and a negative secondary coil node and defining a first secondary node and a second secondary node and including a first rectifier diode coupled to said secondary coil and connected to said first secondary node and a second rectifier diode connected to said second secondary node and coupled to said secondary coil at said positive secondary coil node and including a first rectifier capacitor connected between said first secondary node and said negative secondary coil node and a second rectifier capacitor connected between said negative secondary coil node and said second secondary node for rectifying and doubling the induced AC voltage from the secondary coil to produce the secondary DC voltage, and a first primary coil tuning capacitor connected between said first primary node and said negative primary coil node and a second primary coil tuning capacitor connected between said second primary node and said negative primary coil node and a secondary coil tuning capacitor connected between said secondary coil and said positive secondary coil node for tuning resonance between said primary coil and said secondary coil. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A power transfer system for transferring power from an AC supply outputting a first AC voltage comprising;
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a controller, a filter connected to the AC supply for filtering out undesirable frequencies from the first AC voltage supplied by the AC supply, a matrix converter of the half bridge type connected to said filter for converting the first AC voltage to a second AC voltage, a primary coil connected to said matrix converter for producing an alternating magnetic field in response to receiving the second AC voltage from said matrix converter, a secondary coil in communication with said primary coil for producing an induced AC voltage in response to receiving the alternating magnetic field from said primary coil, a secondary rectifier of the voltage doubling type connected to said secondary coil for rectifying the induced AC voltage from said secondary coil to produce a secondary DC voltage, at least one sensor coupled to said secondary rectifier and in communication with said controller for monitoring the secondary DC voltage from said secondary rectifier and outputting a proportional signal, and said controller configured to control said matrix converter to produce the second AC voltage at a desired level and at a desired operating frequency and maintain the secondary DC voltage at a predetermined level in response to the signal from said sensor. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method of power transfer comprising the steps of:
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supplying a first AC voltage with an AC supply, switching at least one converter switch of a matrix converter at a predetermined switching frequency with a controller, converting the first AC voltage to a second AC voltage at a desired operating frequency with the matrix converter, supplying the second AC voltage to a primary coil, producing an alternating magnetic field in response to the second AC voltage with the primary coil, producing an induced AC voltage in a secondary coil in response to the alternating magnetic field from the primary coil, converting the induced AC voltage to a secondary DC voltage with a secondary rectifier, measuring the secondary DC voltage with a sensor using the controller, varying the second AC voltage using the controller in response to a signal from the sensor, and varying the secondary DC voltage. - View Dependent Claims (15, 16, 17)
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Specification