Systems and methods for power supply synchronization in radio frequency identification (RFID) readers
First Claim
1. A system for power supply synchronization in a Radio Frequency Identification (RFID) reader, the system comprising:
- one or more switched mode power supply devices, each of the one or more devices providing power to at least one component of an RFID reader; and
a signal generator, in communication with each of the one or more switched mode power supply devices, transmitting a synchronization signal comprising a controlling frequency to each of the one or more switched mode power supply devices, wherein the controlling frequency is chosen to be substantially equal to an integer multiple of a channel spacing between adjacent RFID channels.
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Accused Products
Abstract
A system for power supply synchronization in an Radio Frequency Identification (RFID) reader is shown and described. In one embodiment, the system includes one or more switched mode power supply devices and a signal generator. Each of the switched mode power supply devices provides power to at least one component of the RFID reader. The signal generator transmits a synchronization signal of a controlling frequency to each of the one or more power supply devices. In one embodiment, the system includes a signal processing unit that is configured to reject one or more spectral components from the output of the RFID reader.
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Citations
22 Claims
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1. A system for power supply synchronization in a Radio Frequency Identification (RFID) reader, the system comprising:
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one or more switched mode power supply devices, each of the one or more devices providing power to at least one component of an RFID reader; and a signal generator, in communication with each of the one or more switched mode power supply devices, transmitting a synchronization signal comprising a controlling frequency to each of the one or more switched mode power supply devices, wherein the controlling frequency is chosen to be substantially equal to an integer multiple of a channel spacing between adjacent RFID channels. - View Dependent Claims (2, 3)
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4. A system for power supply synchronization in a Radio Frequency Identification (RFID) reader, the system comprising:
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one or more switched mode power supply devices, each of the one or more devices providing power to at least one component of an RFID reader; and a signal generator, in communication with each of the one or more switched mode power supply devices, transmitting a synchronization signal comprising a controlling frequency to each of the one or more switched mode power supply devices, wherein the signal generator comprises an oscillator, in communication with a digital divider circuit, generating the synchronization signal comprising the controlling frequency. - View Dependent Claims (5, 6)
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7. A method for power supply synchronization in a Radio Frequency Identification (RFID) reader, the method comprising:
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generating, by a signal generator, a synchronization signal comprising a controlling frequency; receiving, by one or more switched mode power supply devices in communication with one or more components of a Radio Frequency Identification (RFID) reader, the synchronization signal; and synchronizing the one or more switched mode power supply devices to the controlling frequency, wherein the controlling frequency is substantially equal to an integer multiple of a channel spacing between adjacent RFID channels. - View Dependent Claims (8, 9)
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10. A method for power supply synchronization in a Radio Frequency Identification (RFID) reader, the method comprising:
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generating, by a signal generator, a synchronization signal comprising a controlling frequency; receiving, by one or more switched mode power supply devices in communication with one or more components of a Radio Frequency Identification (RFID) reader, the synchronization signal; synchronizing the one or more switched mode power supply devices to the controlling frequency; and generating, by an oscillator, a first signal of a first frequency and dividing, by a digital divider circuit, the frequency of the first signal to generate the synchronization signal. - View Dependent Claims (11, 12)
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13. A system for power supply synchronization in a Radio Frequency Identification (RFID) reader, the system comprising:
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means for generating a synchronization signal of a controlling frequency; means for receiving, by one or more switched mode power supply devices in communication with one or more components of a Radio Frequency Identification (RFID) reader, the synchronization signal; and means for synchronizing the one or more switched mode power supply devices to the controlling frequency, wherein the controlling frequency is substantially equal to an integer multiple of a channel spacing between adjacent RFID channels.
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14. A method of signal processing on a Radio Frequency Identification (RFID) reader, the method comprising:
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generating, by a signal generator, a controlling frequency; generating, by an oscillator, a first signal of a first frequency and dividing, by a digital divider circuit, the frequency of the first signal to generate a synchronization signal comprising the controlling frequency; synchronizing one or more switched mode power supply devices to the controlling frequency, each of the one or more switched mode power supply devices providing power to at least one component of the RFID reader; controlling, by the signal generator, spectral location of switching noise of the one or more switched mode power supply devices such that the switching noise of each of the one or more switched mode power supply devices appear at a substantially same spectral location and harmonics thereof; and rejecting, by a filtering device, spectral components due to the switching noise of the one or more switched mode power supply devices. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A method of signal processing on a Radio Frequency Identification (RFID) reader, the method comprising:
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generating, by a signal generator, a controlling frequency, wherein the controlling frequency is substantially equal to an integer multiple of a channel spacing between adjacent RFID channels; synchronizing one or more switched mode power supply devices to the controlling frequency, each of the one or more switched mode power supply devices providing power to at least one component of the RFID reader; controlling, by the signal generator, spectral location of switching noise of the one or more switched mode power supply devices such that the switching noise of each of the one or more switched mode power supply devices appear at a substantially same spectral location and harmonics thereof; and rejecting, by a filtering device, spectral components due to the switching noise of the one or more switched mode power supply devices.
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21. A method of signal processing on a Radio Frequency Identification (RFID) reader, the method comprising:
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generating, by a signal generator, a controlling frequency; synchronizing one or more switched mode power supply devices to the controlling frequency, each of the one or more switched mode power supply devices providing power to at least one component of the RFID reader; controlling, by the signal generator, spectral location of switching noise of the one or more switched mode power supply devices such that the switching noise of each of the one or more switched mode power supply devices appear at a substantially same spectral location and harmonics thereof; and rejecting, by a filtering device, spectral components due to the switching noise of the one or more switched mode power supply devices, wherein the rejecting step further comprises removing a spectral component due to a direct current (DC) bias.
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22. A method of signal processing on a Radio Frequency Identification (RFID) reader, the method comprising:
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generating, by a signal generator, a controlling frequency; synchronizing one or more switched mode power supply devices to the controlling frequency, each of the one or more switched mode power supply devices providing power to at least one component of the RFID reader; controlling, by the signal generator, spectral location of switching noise of the one or more switched mode power supply devices such that the switching noise of each of the one or more switched mode power supply devices appear at a substantially same spectral location and harmonics thereof; and rejecting, by a filtering device, spectral components due to the switching noise of the one or more switched mode power supply devices, wherein the rejecting step further comprises removing spectral components due to responses from adjacent RFID readers.
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Specification