Series power factor correction boost converter and method
AssigneeRockwell Collins, Inc.
InventorsMatthew T. Epp, Jeff J. Deloy
Life of this patent
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Abstract
A high voltage direct current (DC) power supply applies an alternating current (AC) concept of power factor correction (PFC) to supply DC voltage using a series PFC boost converter. Multiple series DC/DC boost converters are controlled using voltage feedback from the filtered voltage input in each PFC boost stage to stabilize the DC input voltage and achieve a large step-up voltage ratio. Input voltage feedback is utilized by the controllers in all boost stages of the PFC boost converter so as to appear resistive and compensate for the DC source impedance, which significantly reduces the amount of damping capacitance needed by the system.
Claims20
A series power factor corrector (PFC) boost converter for providing a direct current (DC) voltage, comprising:
- an electromagnetic interference (EMI) filter including a first inductor, a first capacitor connected to ground through a first resistor, and a second capacitor connected to ground, the EMI filter configured to receive an input voltage and pass it through the first inductor;
- a first PFC boost stage with a first input connected to an output of the EMI filter, the first PFC boost stage including a second inductor, a first field effect transistor, a first rectifier, a third capacitor connected to ground through a second resistor, and a fourth capacitor connected to ground;
- a second PFC boost stage with a second input connected to an output of the first PFC boost stage, the second PFC boost stage including a third inductor, a second field effect transistor, a second rectifier, a fifth capacitor connected to ground, and a sixth capacitor connected to ground;
- a first PFC boost controller having inputs configured to receive the input voltage (IN), a first sensed current through the second inductor, and a first output voltage (MID) of the first PFC boost stage, the first PFC boost controller further having a first output to provide a first pulse width modulated (PWM) signal to the first field effect transistor;
- and
- a second PFC boost controller having inputs configured to receive the input voltage (IN), a second sensed current through the third inductor, and a second output voltage (OUT) of the second PFC boost stage, the second PFC boost controller further having a second output to provide a second PWM signal to the second field effect transistor.
A series power factor corrector (PFC) boost converter method for providing a direct current (DC) voltage, comprising:
- providing an input DC voltage to a first PFC boost stage as an input voltage (IN);
- boosting the DC voltage at the first PFC boost stage through a second inductor, a first field effect transistor, a first rectifier, a third capacitor connected to ground, and a fourth capacitor connected to ground;
- boosting the DC voltage at a second PFC boost stage through a third inductor, a second field effect transistor, a second rectifier, a fifth capacitor connected to ground, and a sixth capacitor connected to ground;
- controlling the first PFC boost stage with a first PFC boost controller having inputs receiving the input voltage (IN), a first sensed current through the second inductor, and a first output voltage (MID) of the first PFC boost stage, and outputting a first pulse width modulated (PWM) signal to the first field effect transistor;
- and
- controlling the second PFC boost stage with a second PFC boost controller having inputs receiving the input voltage (IN), a second sensed current through the third inductor, and a second output voltage (OUT) of the second PFC boost stage, and outputting a second PWM signal to the second field effect transistor.
A series power factor corrector (PFC) boost controller for a direct current (DC) power supply, comprising:
- a first input configured to receive an input voltage (IN) of a series PFC boost converter from an electromagnetic interference (EMI) filter of the series PFC boost converter;
- a second input configured to receive a sensed current through an inductor of a PFC boost stage of the series PFC boost converter;
- a third input configured to receive an output voltage (MID or OUT) of the PFC boost stage;
- and
- a first output configured to provide a pulse width modulated (PWM) signal to a field effect transistor of the PFC boost stage.
Dependencies are inferred from the claim text.