48 results about "Buck–boost converter" patented technology

An apparatus includes 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.

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.

A control module is used to control a switching buck-boost converter that 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 so as to alternate: first time periods, in which the second top switch is open and cycles of charge and discharge of the inductor are carried out, during which the inductor is traversed by a current that also passes through the diode and charges the capacitor; and second time periods, in which the first and second top switches are open and the first and second bottom switches are closed so that the current in the inductor recirculates, and the capacitor is discharged by a current that flows in the load.

A method for operating a DC-DC converter (300) which contains a buck-boost converter (10) with an inductor (L) and a plurality of switching elements (S1-S4), comprises measuring a current (I) flowing through the inductor (L) and performing the following method steps: a) comparing the current with a first threshold current value (Ival), b) setting the buck-boost converter into a first switching state (BOOST ON) at the beginning of a switching cycle if the current is below the first threshold current value, or setting the buck-boost converter into a second switching state (BOOST OFF, BUCK ON) at the beginning of the switching cycle if the current is not below the first threshold current value, c) if the buck-boost converter is operated in the first switching state, comparing the current with the first threshold current value (Ival) and setting the buck-boost converter into the second switching state as soon as the current reaches the first threshold current value, d) if the buck-boost converter is operated in the second switching state, comparing the current with a second threshold current value (Ipk) which is greater than the first threshold current value and setting the buck-boost converter into the third switching state (BUCK OFF) as soon as the current reaches the second threshold current value, and repeating steps a) to d) after expiry of the predetermined period duration (Tc).

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.

A water meter reading device disclosed in an embodiment of the present invention comprises: a main board; a lithium-based battery electrically connected to the main board; a capacitor for charging and discharging current stored in the battery; a buck / boost converter connected between the battery and the capacitor; a communication module for performing wireless communication by receiving voltage charged in the capacitor from the buck / boost converter; and a coil connected between the capacitor and the buck / boost converter, wherein the buck / boost converter may control charging of the capacitor by fixing a charging current of the battery at a point at which a maximum capacity is reached.

A control module is used to control a switching buck-boost converter that 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 so as to alternate: first time periods, in which the second top switch is open and cycles of charge and discharge of the inductor are carried out, during which the inductor is traversed by a current that also passes through the diode and charges the capacitor; and second time periods, in which the first and second top switches are open and the first and second bottom switches are closed so that the current in the inductor recirculates, and the capacitor is discharged by a current that flows in the load.

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 control circuit for a single-mode dual-current path buck-boost converter, and a method are provided. The method comprises: during an inductor (L) charging phase, controlling a first switch (S1), a fourth switch (S4), and a fifth switch (S5) to be closed, and controlling a second switch (S2), a third switch (S3), and a sixth switch (S6) to be opened, thereby discharging a first capacitor (C1) and a second capacitor (C2) and increasing inductor (L) current; during an inductor (L) discharging phase, controlling the first switch (S1), the fourth switch (S4), and the fifth switch (S5) to be opened, and controlling the second switch (S2), the third switch (S3), and the sixth switch (S6) to be closed, thereby charging the first capacitor (C1) and the second capacitor (C2) and decreasing inductor (L) current. In the case that inductor (L) current is decreased, the number of switches used is reduced, and the use of a high-voltage-rated switch is prevented, so that the problem of relatively high inductor (L) current and the problem of switches being high-voltage-rated can be both considered, thereby improving the overall efficiency of a chip while achieving chip cost reduction.

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 invention discloses an energy management integrated circuit suitable for temperature difference vibration combined energy taking and a control method. The circuit comprises a VPG circuit, a TEG boost conversion circuit and a combined output circuit. The combined output circuit comprises a voltage limiter and a shunt regulator; the outputs of the TEG and the VPG are connected with the voltage limiter; and the voltage limiter is connected with the shunt regulator. The TEG boost conversion circuit uses a low-voltage ring oscillator and a charge pump to convert a low TEG voltage into an intermediate auxiliary voltage for supplying power to the starting pulse generator circuit; the VPG circuit firstly rectifies and filters an input voltage, after the VPG circuit is conducted, the rectified voltage serves as an input voltage of the buck-boost converter, and the buck-boost converter outputs a current; the combined output circuit synthesizes the output currents of the TEG and the VPG and provides an output voltage for an actual load. The power management integrated circuit can supply power to the sensor, so that self power supply of the converter valve sensor is realized.

The invention provides a multiphase buck-boost converter (101) comprising a first half-bridge circuit (107), a second half-bridge circuit (115), a third half-bridge circuit (111) and a control circuit (130). The first half-bridge circuit (107) is coupled to a first inductor terminal (123). The second half-bridge circuit (115) is coupled to a second inductor terminal (127). The third half-bridge circuit (111) is coupled to a third inductor terminal (125), a system voltage terminal (104), and a battery pack terminal (106). The control circuit (130) is coupled to the first half-bridge circuit (107), the second half-bridge circuit (115), and the third half-bridge circuit (111). The control circuit (130) is configured to transition the first half-bridge circuit (107), the second half-bridge circuit (115), and the third half-bridge circuit (111) from operating in a buck mode to operating in a buck-boost mode based on an off time of the first half-bridge circuit (107) being less than a particular time.

A buck-boost converter circuit includes a mode selection circuit that asserts a buck enable signal if an input voltage is higher than a lower threshold, and asserts a boost enable signal if the input voltage is lower than an upper threshold. A control circuit asserts a buck PWM signal upon a pulse in a buck clock and de-asserts the buck PWM signal if a buck ramp is higher than a buck control signal, and it keeps the buck PWM signal asserted if the buck enable signal is de-asserted. The control circuit asserts a boost PWM signal upon a pulse in a boost clock and de-asserts the boost PWM signal if a boost ramp is higher than a boost control signal, and it keeps the boost PWM signal de-asserted if the boost enable signal is de-asserted.

The invention provides a bootstrap device and a buck-boost converter, the bootstrap device is used for a first transistor and a second transistor of the buck-boost converter, and the bootstrap device comprises a first bootstrap circuit and a second bootstrap circuit. The first bootstrap circuit generates a first bootstrap voltage and determines whether to charge according to at least one of a DC input voltage, a DC output voltage and a second bootstrap voltage according to a change among the first switching voltage, a voltage level of a source terminal of the first transistor and the first bootstrap voltage, and the second bootstrap circuit generates the second bootstrap voltage and determines whether to charge according to at least one of the DC input voltage, the DC output voltage and the second bootstrap voltage. And determines whether to charge according to at least one of the DC input voltage, the DC output voltage and the first bootstrap voltage according to the change among the second switching voltage, the voltage level of the source terminal of the second transistor and the second bootstrap voltage. Therefore, the bootstrap device can charge the bootstrap capacitor quickly and efficiently.

A method for operating a DC-DC converter comprising a buck-boost converter having an inductor and a switching element, comprising measuring a current flowing through the inductor and performing the following steps: a) comparing the current with a first threshold current value; b) if the current is below / not below the first threshold current value, setting the buck-boost converter to a first / second switching state at the beginning of the switching period; c) if the buck-boost converter is operating in the first switching state, comparing the current with a first threshold current value, setting the buck-boost converter to a second switching state once the current reaches the first threshold current value; d) if the buck-boost converter is operating in the second switching state, comparing the current with a second threshold current value, setting the buck-boost converter to a third switching state once the current reaches the second threshold current value; and repeating steps a) to d) after expiration of the predetermined period duration.

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.

A power converter including a buck-boost converter is disclosed. The buck-boost converter comprises a transistor (11) having a terminal, e.g., a source terminal, coupled to the output terminal (17B) and to the terminal of the capacitor (15).

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.

A fault tolerant DC-DC converter including a transformer and a pair of mirrored power converters. The transformer has a primary inductance driven by a power supply and has a secondary inductance with an intermediate tap. A main power converter includes first and second current control devices, a first inductance, and a first capacitance coupled to the secondary inductance for developing a main voltage output. A mirrored power converter includes third and fourth current control devices, a second inductance, and a second capacitance also coupled to the secondary inductance for developing a mirrored voltage output. Output circuitry couples to the main and mirrored power converters to share power to a load, such as a battery. The output circuitry may be configured as a buck boost converter that is responsive to a failure of any of the current control devices to maintain the primary output voltage level at a regulated level.

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.

The application provides a quasi-vertical power device and a manufacturing method and a chip thereof. The quasi-vertical power device comprises a substrate, a buffer layer, a gallium nitride high-doped N+ layer, a gallium nitride low-doped N- layer, a gallium nitride P-type substrate and a gallium nitride N-type active region which are sequentially arranged on the substrate along a first direction. The quasi-vertical power device is provided with two grooves, and ohmic contact metal and Schottky contact metal are arranged in the grooves respectively, so that ohmic contact and Schottky contact are realized, quasi-vertical MOSFET and Schottky barrier diode are formed respectively, the quasi-vertical MOSFET and the Schottky barrier diode are integrated in parallel, the reverse recovery loss is reduced, the reverse recovery speed is improved, the switching characteristic is faster, and the quasi-vertical power device can be used in high-frequency occasions, such as a step-down / step-up converter, a voltage source inverter and a resonant converter.

The techniques and circuits, described herein, include solutions for pass-through operation including overcurrent protection in buck-boost converters. In some aspects, first and second switches selectively couple inputs of a peak current comparator to inputs of an error amplifier during pass-through operation. As part of peak current control scheme, one of the peak current comparator inputs is coupled to a current sensor that senses a current through an inductor of the buck-boost converter. As a result, an output of the error amplifier tracks the inductor current during pass-through mode, which may be utilized to implement inductor overcurrent protection in the pass-through mode.

A bootstrap device used for first and second transistors of a buck-boost converter includes first and second bootstrap circuits. The first bootstrap circuit generates a first bootstrap voltage, and determines, based on a change among a first switching voltage, a voltage level of a source terminal of the first transistor and the first bootstrap voltage, whether to charge according to at least one of a DC input voltage, a DC output voltage, and a second bootstrap voltage. The second bootstrap circuit generates the second bootstrap voltage, and determines, based on a change among a second switching voltage, a voltage level of a source terminal of the second transistor, and the second bootstrap voltage, whether to charge according to at least one of the DC input voltage, the DC output voltage, and the first bootstrap voltage. The bootstrap device improves charging efficiency of bootstrap capacitors.

Various embodiments relate to a buck-boost converter controller configured to control a buck-boost controller, wherein the buck-boost converter has a buck mode of operation, a boost mode of operation, and a buck-boost mode of operation, including: a phase controller configured to produce phase control signals to control switching in the buck-boost converter, wherein the phase control signals are based on a mode of operation of the buck-boost converter; and an automatic mode selector configured to indicate to the phase controller the mode of operation of the buck-boost controller based upon a buck on-time TON_bk or a buck off-time TOFF_bk, a boost on-time TON_bst or a boost off-time TOFF_bst, and a control configuration on-time TPI3, where TON_bk is the on-time during the buck mode of operation, TOFF_bk is the off-time during the buck mode operation, TON_bst is the on-time during the boost mode of operation, TOFF_bk is the off-time during the boost mode operation, and TPI3 is the time where a second high-side transistor is on and a first low side transistor is on.

A buck boost converter with pass through mode is discussed. The buck boost converter may operate at buck mode, boost mode, buck-boost mode, and pass through mode based on different input voltage and output voltages. A control circuit periodically controls the power switches to operate at a refresh mode when the buck boost converter operates at the pass through mode. Thus, the bootstrap voltages that are used to drive the N-type power switches are timely charged.

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.

The present application discloses a control circuit and method of a single-mode dual-current-path step-down / step-up converter, including: during a charging period of an inductor, controlling a first switch, a fourth switch and a fifth switch to close, and controlling a second switch, a third switch and a sixth switch to open, so as to discharge a first capacitor and a second capacitor, and increase a current of the inductor; during a discharging period of the inductor, controlling the first, the fourth and the fifth switches to open, and controlling the second, the third switch and the sixth switches to close, so as to charge the first and second capacitor, and reduce the current of the inductor.

The techniques and circuits, described herein, include solutions for pass-through operation including overcurrent protection in buck-boost converters. In some aspects, first and second switches selectively couple inputs of a peak current comparator to inputs of an error amplifier during pass-through operation. As part of peak current control scheme, one of the peak current comparator inputs is coupled to a current sensor that senses a current through an inductor of the buck-boost converter. As a result, an output of the error amplifier tracks the inductor current during pass-through mode, which may be utilized to implement inductor overcurrent protection in the pass-through mode.