4 results about "Buck–boost converter" patented technology

Provided is a power conversion apparatus including an input circuit generating an input voltage, a buck-boost converter connected to the input circuit, a first full-bridge inverter and a second full-bridge inverter, which are connected to the buck-boost converter, at least one first inductor connected to the first full-bridge inverter, at least one second inductor connected to the second full-bridge inverter, an output circuit connected to the at least one first inductor and the at least one second inductor to generate an alternating current output voltage, and at least one processor configured to apply a first carrier signal and a reference signal to the first full-bridge inverter and applying a second carrier signal and the reference signal to the second full-bridge inverter, wherein the first full-bridge inverter operates based on the first carrier signal and the reference signal, and the second full-bridge inverter operates based on the second carrier signal and the reference signal.

A power converter control module is disclosed. A control module for controlling a switching buck-boost converter includes: an inductor, a capacitor, a first top switch and a second top switch, a first bottom switch and a second bottom switch, and a diode coupled to the second top switch. The control module controls the switching buck-boost converter to alternate between a first time period and a second time period. In the first time period, the second top switch is open and a cycle of charging and discharging the inductor is performed. During this cycle, the inductor is also energized by current flowing through the diode and charging the capacitor. In the second time period, the first and second top switches are open, and the first and second bottom switches are closed, causing the current in the inductor to recirculate and the capacitor to be discharged by current flowing in the load.

Generating a variable off-phase duty cycle D based on the input signal d to optimize the low duty cycle of the freewheel phase. A variable on-phase duty cycle D is generated based on a buck-boost control loop tracking the input signal e . The three-state buck-boost converter is controlled using the variable on-phase duty cycle D e and the variable off-phase duty cycle D d .

Electric drive system (15), comprising: a voltage bus with a positive bus rail (19+) and a negative bus rail (19-) and a DC bus voltage across the bus rails (19+, 19-); a battery pack (20) that is connected between the positive bus rail (19+) and the negative bus rail (19-) of the voltage bus and provides a battery voltage (V bat + , V bat - ) delivers; a DC / DC converter (30) comprising a set of semiconductor switches (34) connected between the positive bus rail (19+) and the negative bus rail (19-) and having a bypass switch (S0, 32) connected to the positive bus rail (19+), wherein the DC / DC converter (30) is configured as a buck / boost converter; a traction power inverter module (40), TPIM (40), with a DC side connected to the DC-DC converter (30) at an inverter bus voltage (31+, 31-) and with an AC side, AC, wherein the TPIM (40) is configured to direct the inverter bus voltage (31+, 31-) and thereby generate an AC bus voltage at phase lines (48); a rotating electric machine (16) connected to the AC side of the TPIM (40) and powered via the AC bus voltage; and a controller (50) configured to provide a required output power of the DC-DC converter (30) based on a requested operating mode, a target speed (N) 16 ) and a target torque (T 16 ) of the electrical machine (16) calculated to compare the required output power with a calibrated power threshold, and: if the required output power exceeds the calibrated power threshold, close the bypass switch (S0, 32) and thereby bypass the DC-DC converter (30); and If the required output power is less than the calibrated power threshold, a minimum loss voltage (V) MIN-L ) from a loss card (52) and then the minimum loss voltage (V MIN-L ) to use as a target control voltage of the DC-DC converter (30) in order to optimize the efficiency of the electric drive system (15) with the bypass switch (S0, 32) open; where the bypass switch (S0, 32) is a mechanical relay or bidirectional semiconductor switch.