Bidirectional electrical signal converter
First Claim
1. A power converter comprising:
- a first inductor-capacitor circuit electrically connected to an alternating current (AC) power source;
a first switching transistor electrically connected to the first inductor-capacitor circuit;
a second inductor-capacitor circuit electrically connected to the first switching transistor and the first inductor-capacitor circuit;
a first high-frequency switching transistor electrically connected to the second inductor-capacitor circuit and a direct current (DC) load; and
a controller operatively connected to the first switching transistor and the first high-frequency switching transistor to operate the power converter in an AC-to-DC conversion mode, the controller being configured to;
operate the first switching transistor and the first high-frequency switching transistor to generate a DC output signal for the DC load from the AC power source;
identify an error between a measurement of the DC output signal from the first high-frequency switching transistor and a predetermined DC output signal level for the DC load; and
adjust a duty cycle of a pulse width modulation (PWM) switching signal with reference to the identified error and a proportional-integral-differential (PID) controller to switch the high-frequency switching transistor at a predetermined frequency with the adjusted duty cycle to reduce the identified error in the DC output signal.
1 Assignment
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Accused Products
Abstract
A bidirectional AC-to-DC and DC-to-AC circuit includes a first inductor-capacitor (LC) circuit connected to an AC power source, a transistor synchronized with the AC power source signal, a second LC circuit electrically connected to the synchronized transistor and the first inductor-capacitor circuit, a high-frequency switching transistor electrically connected to the second inductor-capacitor circuit and a direct current (DC) load, and a controller connected to the high-frequency switching transistor. The controller identifies an error between a measured DC output signal and a predetermined DC output signal that is applied to the DC load, and adjusts a duty cycle of a pulse width modulation (PWM) switching signal for the high-frequency transistor to reduce the identified error.
19 Citations
19 Claims
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1. A power converter comprising:
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a first inductor-capacitor circuit electrically connected to an alternating current (AC) power source; a first switching transistor electrically connected to the first inductor-capacitor circuit; a second inductor-capacitor circuit electrically connected to the first switching transistor and the first inductor-capacitor circuit; a first high-frequency switching transistor electrically connected to the second inductor-capacitor circuit and a direct current (DC) load; and a controller operatively connected to the first switching transistor and the first high-frequency switching transistor to operate the power converter in an AC-to-DC conversion mode, the controller being configured to; operate the first switching transistor and the first high-frequency switching transistor to generate a DC output signal for the DC load from the AC power source; identify an error between a measurement of the DC output signal from the first high-frequency switching transistor and a predetermined DC output signal level for the DC load; and adjust a duty cycle of a pulse width modulation (PWM) switching signal with reference to the identified error and a proportional-integral-differential (PID) controller to switch the high-frequency switching transistor at a predetermined frequency with the adjusted duty cycle to reduce the identified error in the DC output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A power converter comprising:
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a first inductor-capacitor circuit electrically connected to an alternating current (AC) power source; a first switching transistor electrically connected to the first inductor-capacitor circuit; a second inductor-capacitor circuit electrically connected to the first switching transistor and the first inductor-capacitor circuit; a first high-frequency switching transistor electrically connected to the second inductor-capacitor circuit and a direct current (DC) load; a controller operatively connected to the first switching transistor and the first high-frequency switching transistor to operate the power converter in an AC-to-DC conversion mode, the controller being configured to; operate the first switching transistor and the first high-frequency switching transistor to generate a DC output signal for the DC load from the AC power source; identify an error between a measurement of the DC output signal from the first high-frequency switching transistor and a predetermined DC output signal level for the DC load; and adjust a duty cycle of a pulse width modulation (PWM) switching signal to switch the high-frequency switching transistor at a predetermined frequency with the adjusted duty cycle to reduce the identified error in the DC output signal; a voltage sensor operatively connected to an output of the AC power source and configured to identify a level of AC voltage from the AC power source; and the controller being operatively connected to the first switching transistor and the voltage sensor, the controller being further configured to switch off the first switching transistor in response to a positive level of AC voltage from the AC power source. - View Dependent Claims (14)
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15. A power converter comprising:
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a first inductor-capacitor circuit electrically connected to an alternating current (AC) power source; a first switching transistor electrically connected to the first inductor-capacitor circuit; a second inductor-capacitor circuit electrically connected to the first switching transistor and the first inductor-capacitor circuit; a first high-frequency switching transistor electrically connected to the second inductor-capacitor circuit and a direct current (DC) load; a controller operatively connected to the first switching transistor and the first high-frequency switching transistor to operate the power converter in an AC-to-DC conversion mode, the controller being configured to; operate the first switching transistor and the first high-frequency switching transistor to generate a DC output signal for the DC load from the AC power source; identify an error between a measurement of the DC output signal from the first high-frequency switching transistor and a predetermined DC output signal level for the DC load; and adjust a duty cycle of a pulse width modulation (PWM) switching signal to switch the high-frequency switching transistor at a predetermined frequency with the adjusted duty cycle to reduce the identified error in the DC output signal; a second switching transistor electrically connected to the first inductor-capacitor circuit and configured to switch at predetermined switching frequency corresponding to a frequency of an AC output signal for an AC load; a second high-frequency switching transistor electrically connected to the second inductor-capacitor circuit and a DC power source; and the controller being operatively connected to the second switching transistor and the second high-frequency switching transistor to operate the power converter in a DC-to-AC conversion mode to generate the AC output signal for the AC load using the DC power source, the controller being further configured to; generate a control signal at the predetermined switching frequency to operate the first switching transistor and the second switching transistor, the first switching transistor being switched off when the second switching transistor is switched on, and the first switching transistor being switched off when the second switching transistor is switched on; identify another error between the AC output signal that is generated for the AC load and a predetermined AC output signal; and adjust a duty cycle of a pulse width modulation (PWM) switching signal for the second high-frequency switching transistor to reduce the other error identified in the AC output signal. - View Dependent Claims (16, 17, 18, 19)
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Specification