18 results about "Buck–boost converter" patented technology

The invention provides a bus voltage equalizing system for a three-level Buck Boost converter, which comprises a main control unit, a filter capacitor C3, a soft start loop and a main relay, and is characterized in that the main control unit is used for monitoring the working state of a battery and starting the soft start loop when the battery works normally; the soft start loop and the main relay are controlled to be in a closed state, and the voltage between the positive bus and the negative bus is balanced by controlling the duty ratio difference of the switching tube of the first bridge arm and the switching tube of the second bridge arm; when the battery breaks down, the soft start loop and the main relay are disconnected, and the voltage between the positive bus and the negative bus is balanced through the filter capacitor. Therefore, bus voltage sharing under all working conditions can be realized.

The invention relates to a working mode switching method of a Buck Boost converter. The method comprises the following steps: generating a reference duty ratio based on a sampling current, a sampling voltage and a reference voltage reference value of the Buck Boost converter; obtaining a current working mode, a Buck unit compensation duty ratio and a Boost unit compensation duty ratio of the Buck Boost converter based on the reference duty ratio; generating a Buck unit duty ratio and a Boost unit duty ratio based on the reference duty ratio, the current working mode, the Buck unit compensation duty ratio and the Boost unit compensation duty ratio; and controlling a switching tube of the Buck Boost converter based on the duty ratio of the Buck unit and the duty ratio of the Boost unit so as to realize consistent output voltage gain. According to the invention, voltage gains before and after working mode switching can be consistent, so that the problem of violent voltage fluctuation is solved.

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 three-phase single-stage power supply includes a positive output terminal, a negative output terminal, a first single-stage conversion module, a second single-stage conversion module, and a third single-stage conversion module. Output terminals of the first single-stage conversion module, the second single-stage conversion module and the third single-stage conversion module are connected in parallel between the positive output terminal and the negative output terminal. The third single-stage conversion module includes a third transformer, a third output rectifier circuit, a relay, an auxiliary inductor and an auxiliary capacitor. The third rectifier circuit includes a fifth switch circuit and a sixth switch circuit, which includes two switches connected in series, respectively, and the relay, the auxiliary inductor and the auxiliary capacitor are connected in series between a midpoint of the two switches in the sixth switch circuit and the negative output terminal, to be served as a buck / boost converter.

The invention discloses a three-phase single-stage power supply, which comprises a positive output end, a negative output end, a first single-stage conversion module, a second single-stage conversion module and a third single-stage conversion module, the output ends of the first, second and third single-stage conversion modules are connected in parallel to the positive output end and the negative output end. The third single-stage conversion module comprises a third transformer, a third output rectification circuit, a relay, an auxiliary inductor and an auxiliary capacitor, wherein the third output rectification circuit comprises a fifth group of switching circuits and a sixth group of switching circuits. And the fifth group of switching circuits and the sixth group of switching circuits respectively comprise two switches which are connected in series. And the relay, the auxiliary inductor and the auxiliary capacitor are connected in series between the midpoint of the two switches of the sixth group of switching circuits and the negative output end, so that the third single-stage conversion module forms a buck / boost converter.

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.

The present disclosure provides sensing a peak current and estimating a turn-off time of a switch using the peak to perform a discontinuous current mode (DCM) operation. According to the present disclosure, the buck-boost DC / DC converter includes: a first control circuit configured to build up a current, input through an input node, in an inductor during a first time period of a switching period; a sensing circuit configured to sense a current input through the input node to generate a sampling value for estimating a duration of a second time period; and a second control circuit configured to receive the sampling value from the sensing circuit and to output the current built up in the inductor through an output side during the second time period estimated based on the sampling value.

The invention is entitled "PFM controller for multi-level converter utilizing flying capacitor voltage monitor." An interleaved buck-boost converter is disclosed. The interleaved buck-boost converter includes a multi-level direct current (DC) to DC converter (MLDC converter), a flying capacitor monitor, and a voltage level controller. The MLDC converter includes an IMPM, and the IMPM includes a flying capacitor. The flying capacitor monitor is in signal communication with the flying capacitor, and the voltage level controller is in signal communication with the flying capacitor monitor. The flying capacitor monitor compares a flying capacitor voltage of the flying capacitor, and switches an operating state of the MLDC converter if the flying capacitor voltage is less than a first flying capacitor reference voltage.

An apparatus includes a converter circuit (e.g., a buck / boost converter) comprising at least one transistor and a pulse width modulated (PWM) signal generator circuit configured to receive a duty command signal, to generate at least one PWM signal for the at least one transistor responsive to the duty command signal, and to selectively disable the at least one PWM signal responsive to at least one gating signal. The apparatus further includes a gating circuit configured to generate the at least one gating signal responsive to a current sense signal representing a current through the converter circuit.

A multi-phase buck-boost converter system can include an external discrete component power stage and a controller integrated circuit. The external discrete component power stage can include a first and second phases each respectively having an input half bridge including first and second or third and fourth discrete switching devices and corresponding first and second discrete inductors operable as first and second buck stages. The controller integrated circuit can include a first and second output half bridges respectively corresponding to the first and phases and respectively having fifth and sixth or seventh and eighth integrated switching devices respectively coupled to the first or second discrete inductors and respectively operable as first and second boost stages in conjunction with the first and second buck stages as a first buck-boost converter and controller circuitry that operates the first and second buck-boost converters to produce a regulated output voltage from an input voltage.

Techniques and apparatus for driving the gate of a high-side transistor in a switched-mode power supply (SMPS) circuit, such as an inverting buck-boost converter or a buck converter. One example technique to pull down the gate voltage of the high-side transistor involves a multi-step approach, in which the gate voltage is initially discharged to a lower voltage level, and once the gate voltage falls below a certain level, an auxiliary switch can take over to completely turn off the high-side transistor. One example SMPS circuit generally includes a high-side transistor, a pulldown gate driver having an output coupled to a gate of the high-side transistor, a pulse generator having an output coupled to an input of the pulldown gate driver, and a first switch coupled between the gate and a source of the high-side transistor.

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 .

An electrical power management module (1a,1b) configured to provide electrical power between a battery (2a, 2b) and a power bus (3) of a vehicle, the electrical power management module (1a,1b) comprising a DC-DC converter configured to provide electrical power when the power bus voltage is higher than the battery voltage, and when the power bus voltage is lower than the battery voltage. The DC-DC converter is a non-isolated bidirectional buck-boost converter without series-connected capacitive elements, and is configured to work in buck mode, boost mode or buck-boost and pass-thru mode.

A four-switch buck-boost converter configured to couple to a source battery and a target battery includes an inductor and switches S1, S2, S3, and S4 connected so as to define (i) a buck mode in which the switch S3 is always ON, and the switches S1 and S2 control charging and discharging of the inductor, (ii) a boost mode in which the switch S1 is always ON, and the switches S3 and S4 control the charging and the discharging of the inductor, and (iii) a buck-boost mode in which all of the switches S1, S2, S3, and S4 control the charging and the discharging of the inductor. A controller operates the converter in the buck mode, the boost mode, and the buck-boost mode, when it turns the switch S1 ON at a beginning of a switching cycle, and turns the switch S4 ON at an end of the switching cycle.

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.

A multi-phase buck-boost converter system can include an external discrete component power stage and a controller integrated circuit. The external discrete component power stage can include a first and second phases each respectively having an input half bridge including first and second or third and fourth discrete switching devices and corresponding first and second discrete inductors operable as first and second buck stages. The controller integrated circuit can include a first and second output half bridges respectively corresponding to the first and phases and respectively having fifth and sixth or seventh and eighth integrated switching devices respectively coupled to the first or second discrete inductors and respectively operable as first and second boost stages in conjunction with the first and second buck stages as a first buck-boost converter and controller circuitry that operates the first and second buck-boost converters to produce a regulated output voltage from an input voltage.

A tracker circuit includes a buck boost converter circuit configured to convert an input voltage VIN to a variable voltage V1, a buck converter circuit configured to convert the input voltage VIN to a variable voltage V2 that is lower than the input voltage VIN, and a supply modulator configured to selectively supply at least one discrete voltage of a plurality of discrete voltages including the variable voltages V1 and V2 to a power amplifier.

An apparatus comprising: a buck converter portion of a buck-boost converter configured to operate under a constant on-time control scheme, wherein an on-time of a high-side switch of the buck converter portion is determined by a buck on-time timer; and a boost converter portion of the buck-boost converter configured to operate under a constant off-time control scheme, wherein an off-time of a low-side switch of the boost converter portion is determined by a boost off-time timer.