Abstract: The switched-mode power supply includes a first switch connected to an input terminal for receiving an input voltage, a second switch, a first node between the first switch and the second switch. The switched-mode power supply further includes a third switch connected to the input terminal, a fourth switch, and a second node between the third switch and the fourth switch. A first inductor is connected between the first node and an output terminal, a second inductor is connected between the second node and the output terminal, at least one third inductor is connected between the first node and the second node, and a capacitor is connected to the output terminal.

Abstract: A DC-DC converter includes: a step-up-or-step-down circuit including a choke coil and step-down and step-up transistor pairs; and a control circuit to control the transistor pairs based on an output voltage, wherein the control circuit includes: a differential triangular wave generation circuit to generate a positive-phase triangular wave signal and a negative-phase triangular wave signal; a switch to select the positive-phase triangular wave signal or the negative-phase triangular wave signal in response to a switching signal; an error detector to output an error signal; a PWM comparator to compare the positive-phase triangular wave signal or the negative-phase triangular wave signal with the error signal to generate a control pulse signal; a switching comparator to compare the error signal with reference potential and generate the switching signal; and a driver control circuit to generate a control signal for the transistor pairs based on the control pulse signal and the switching signal.

Abstract: A switching power converter includes a voltage source that provides an input voltage Vin to an unregulated DC/DC converter stage and at least one buck-boost converter stage to produce a desired output voltage Vout. The unregulated DC/DC converter stage is adapted to provide an isolated voltage to the at least one regulated buck-boost converter stage, wherein the unregulated DC/DC converter stage comprises a transformer having a primary winding and at least one secondary winding and at least one switching element coupled to the primary winding. The at least one buck-boost converter stage is arranged to operate in a buck mode, boost mode or buck-boost mode in response to a mode selection signal from a mode selection module. By influencing the pulse width modulation output power controller the at least one buck-boost converter stage is arranged to produce one or multiple output voltages.

Abstract: A “windowless” H-bridge buck-boost switching converter includes a regulation circuit with an error amplifier which produces a ‘comp’ signal, a comparison circuit which compares ‘comp’ with a ‘ramp’ signal, and logic circuitry which receives the comparison circuit output and a mode control signal indicating whether the converter is to operate in buck mode or boost mode and operates the primary or secondary switching elements to produce the desired output voltage in buck or boost mode, respectively. A ‘ramp’ signal generation circuit operates to shift the ‘ramp’ signal up by a voltage Vslp(p?p)+Vhys when transitioning from buck to boost mode, and to shift ‘ramp’ back down by Vslp(p?p)+Vhys when transitioning from boost to buck mode, thereby enabling the converter to operate in buck mode or boost mode only, with no need for an intermediate buck-boost region.

Abstract: A current reversible DC/DC double-boost quadratic converter, capable of performing high transformation ratios.

Abstract: A synchronous rectifying buck-boost converter includes a controller, first and second transistors, an inductor and a capacitor. The controller is connected to the gates of the first and second transistors for controlling ON/OFF of the first and second transistors, and further controls the current of the inductor and charge/discharge of the capacitor. The first and second transistors connected in series are connected to the controller and the inductor. The inductor is connected to a first external power unit or a first external loading device. The drain of the first transistor is connected to a second external power unit or a second external loading device such that a low-voltage input power of the first external power unit is converted to a high-voltage output power or a high-voltage input power of the second external power unit is converted to a low-voltage output power.

Abstract: A buck/boost voltage regulator generates a regulated output voltage responsive to an input voltage and a plurality of control signals. The buck/boost voltage regulator includes a plurality of switching transistors responsive to the plurality of control signals. Control circuitry monitors the regulated output voltage and generates the plurality of control signals responsive thereto. The control circuitry controls the operation of the plurality of switching transistors to enable a charging phase in a first mode of operation, a pass through phase in a second mode of operation and a discharge phase in a third mode of operation within the buck/boost voltage regulator to eliminate occurrence of a four switch switching condition.

Abstract: A solar array system includes at least one solar array and at least one solar array regulator. The solar array regulator has an input port to be connected to the solar array, and an output port to be connected to a power bus. The solar array comprises a switching voltage converter comprising a step-down (PC1) and a step-up (PC2) power cell connected in cascade; and a control circuit for driving said voltage converter in a step-up, a step-down or a direct energy transfer mode, depending on an input control signal and on at least one feedback signal (SILF) indicative of an operating condition of said switching voltage converter; characterized in that said at least one feedback signal (SILF) is indicative of an intensity of an electrical current (IL) flowing between said step-down and said step-up power cells, whereby the control circuit implements an internal current feedback control.

Abstract: This invention provides a switching converter having a plurality N of outputs providing N output signals and at least one inductor, comprising a first controlling device for controlling the total energy flowing over the inductor to the N outputs dependent on a first control signal, at least a second controlling device for distributing the total energy between the N outputs by means of at least a second control signal, wherein the first controlling device is coupled to all N outputs for receiving a number M of the respective feedback output signals of the N outputs, M?N, wherein the first controlling device comprises first means for weighting the M feedback output signals and second means for providing the first control signal dependent on the weighted M feedback output signals.

Abstract: A buck converter comprising a controller arranged to monitor an output voltage of the converter, the controller comprising: a comparator arranged to compare an output voltage at an output of the buck converter with a reference voltage, and a modification circuit within the comparator or connected to a modification signal input of the comparator and arranged to produce a correction signal to modify the operation of the comparator; and an output.

Abstract: A power system comprising a non-isolated voltage regulator configured to couple to an input voltage and produce an output voltage, wherein the non-isolated voltage regulator is in a power distribution system and configured to boost the input voltage when the input voltage is less than a minimum output voltage, to reduce the input voltage when the input voltage is greater than a maximum output voltage, and to pass-through the input voltage when the input voltage is greater than or equal to the minimum output voltage and less than or equal to the maximum output voltage.

Abstract: A method for providing non-resonant zero-voltage switching in a switching power converter. The switching power converter converts power from input power to output power during multiple periodic switching cycles. The switching power converter includes a main switch and an auxiliary capacitor adapted for connecting to the main switch, and an inductor connectible to the auxiliary capacitor. When the main switch is on, a previously charged (or previously discharged) auxiliary capacitor is connected to the main switch with auxiliary switches. The main switch is switched off with zero voltage while discharging non-resonantly (charging) the auxiliary capacitor by providing a current path to the inductor. The auxiliary capacitor is disconnected from the main switch.

Abstract: The disclosed methodology for buck-boost inverted voltage conversion uses a boost stage coupled to a charge pump stage at a switch node controlled by a transistor switch coupled between the switch node and ground. The boost stage includes a boost inductor coupled between an input supply voltage and the switch node, and the charge pump stage includes a charge pump capacitor coupled between the switch node and a pump node which is coupled to the load and an output capacitor in parallel with the load.

Abstract: A direct current to direct current (DCDC) voltage converter is described comprising a controller and at least one converter circuit. The converter circuit comprises at least first and second inductors, each having an input and an output; a first input switch connected to the input of the first inductor; a second input switch connected to the input of the second inductor; and an output switch connected to the outputs of the inductors for selectively combining the outputs to form a parallel combination of the inductors or a series combination of the inductors. The controller generates signals for selectively connecting the first and second input switches and the output circuit between a pair of power supply input terminals and a pair of power supply output terminals. In response to appropriate signals from the controller, the converter circuit can be operated as a buck converter or a boost converter.

Abstract: Novel circuitry and methodology for controlling a step up-step down switching regulator that produces a regulated output signal at an output node in response to an input signal at an input node, and has an inductive device, a plurality of switching circuits for providing connection of the inductive device to the input and output nodes and a ground node, and a switch control circuit for driving the switching devices so as to enable the power supply system to operate in a boost mode to increase the input signal, in a buck mode to decrease the input signal, and in a buck-boost mode when a difference between the input signal and the output signal is within a predetermined range. Buck-boost latch circuitry is provided for latching a transition between the buck mode and the buck-boost mode, or between the boost mode and the buck-boost mode based on a predetermined condition.

Abstract: A current mode buck-boost converter has an input terminal, an output terminal, and an output capacitor coupled to the output terminal. The input terminal is used to receive an input voltage, and the output terminal is for producing the output voltage. The current mode buck-boost converter comprises a voltage converter and a control circuit. The voltage converter comprises an inductor. The control circuit is for detecting the current passing through the inductor to determine the electric energy transmitted to the output terminal by the voltage converter. Accordingly, the current mode buck-boost converter has fast response, and the electrical energy can be recycled and stored to the voltage source when the current mode buck-boost converter operates in down-tracking process.

Abstract: A DC-to-DC converter adapted for generating a power voltage required by a load and including a buck circuit and a boost circuit is provided. The buck circuit is used for receiving a DC input voltage, and outputting the power voltage by performing a buck process to the DC input voltage, or directly outputting the DC input voltage according to a first control signal. The boost circuit is used for receiving the power voltage or the DC input voltage both output from the buck circuit, and outputting the power voltage to the load by performing a boost process to the DC input voltage output from the buck circuit, or directly outputting the power voltage output from the buck circuit to the load according to a second control signal.

Abstract: A safe electric power regulating circuit is connected between a power supply and a voltage boost/buck circuit to regulate the output voltage by the power supply to have a target voltage through the voltage boost/buck circuit. A switching device includes a switch unit, a first diode, and a first capacitor. The switch unit includes a first end, a second end, and a third end. The first end is connected to the power supply, and the second end is connected to the voltage boost/buck circuit. The switch unit is controlled to connect the third end to the first end or the second end. The first diode has an anode connected to the first end of the switch unit. The first capacitor has one end connected to the third end of the switch unit and the other end connected to circuit ground.

Abstract: An integrated converter with single-ended control and power factor correction includes an input unit, a boost inductor, a voltage regulator, an energy-storing capacitor, a buck-boost converter, a single-ended switch and a control unit. The voltage regulator and the buck-boost converter share the single-ended switch and the control unit in order to correct power factor, reduce output ripple, simplify the complexity of circuit and decrease the number of components. The voltage regulator is utilized in reducing the frequency of switching and the conductive losses, thus improving overall performance. With the magnetic loop, the transformers of the boost inductor and the voltage regulator can be merged, and thus the efficiency of the whole spatial usage is increased and the noise interference is reduced.

Abstract: A multi-phase non-inverting buck boost voltage converter has a plurality of buck boost voltage regulators. Each regulator is associated with a separate phase for generating a regulated output voltage responsive to an input voltage. A plurality of current sensors are each associated with one of the plurality of buck boost voltage regulators for monitoring an input current to the associated buck boost voltage regulator and generating a current sense signal for the associated phase. A plurality of buck boost mode control circuitries are each associated with one of the buck boost regulator for controlling an associated buck boost voltage regulator using peak current mode control in a buck mode of operation and valley current mode control in boost mode of operation responsive to a common error voltage and the associated current sense signal. The plurality of buck boost mode control circuitries provides current balancing between the phases.

Abstract: In an embodiment, set forth by way of example and not limitation, a circuit for increasing power supply hold-up time includes an inductor, two capacitors and a controller. A first capacitor has a first node coupled to a first node of the inductor and has a second node coupled to ground. A second capacitor has a first node coupled to a second node of the inductor and has a second node coupled to ground. The controller is preferably operative to direct current through the inductor such that the inductor can serve as a Boost inductor for the second capacitor and a Buck inductor for the first capacitor.

Abstract: A DC-DC converter is disclosed having an input configured to receive an input signal and an output configured to present an output signal at a different voltage than the input signal. The converter also includes at least one inductor and at least one capacitor. Two or more transistors fingers are provided such that at least one of the two or more transistor fingers comprises two or more switching transistors, each of which has an input, an output, a control input. An activation controller connect to at least one of the two or more switching transistors, the activation controller configured to control whether the at least one of the two or more switching transistors is active or non-active. Also disclosed is a buck-boost converter with numerous controlled switches that establish the converter in either buck-boost mode, buck mode or boost mode.

Abstract: ADC-DC converter, for a solar charger, is disclosed. The converter is based on a buck-boost converter, and is operable both in a boost mode, and in a buck mode. The converter differs from known converters, in that during buck mode operation, the boost mode is disabled, thereby reducing or eliminating the losses associated with buck mode operation. Methods of operating such a reconfigurable buck-boost converter are also disclosed as is a computer programme product for controlling a reconfigurable buck-boost converter.

Abstract: Systems and methods for providing a buck-boost converter with an improved efficiency are disclosed. The buck-boost converter disclosed operates in 5 different modes, namely in buck mode, half frequency buck mode, half frequency buck-boost mode, half frequency boost mode, and in boost mode. In half frequency buck mode, buck-boost mode, and in half frequency boost mode the switching frequency is halved compared to the switching frequency of buck or boost mode. A simple circuit implementation by adding two offset voltages in ramp signals or PWM comparators enables to halve the switching frequency if required.

Abstract: A driver circuit (1) for driving a capacitive load (2) with a drive pulse having a rise time, a predetermined voltage period and a fall time. The driver circuit (1) includes an inductance (6), switches (10, 11, 12), and a transformer (8) having a primary side (8) and secondary side (9). The switches (10, 11, 12) are controlled by a controller (13) to charge the inductance (6) from a power supply (4), and, when the capacitive load (2) is to be driven, to enable a charge path from the inductance (6) to the capacitive load (2) during the rise time, to disable the charge path during the constant peak voltage period and to enable a discharge path via the primary side (8) of the transformer (7) during the fall time. As the capacitive load (2) discharges through the primary side (8) of the transformer (7), charge is induced on the secondary side (9) of the transformer (7) and is used to charge the inductance (6), thereby saving power and enabling a lower voltage power supply to be used.

Abstract: A circuit for providing at least two power supply voltages from a D.C. voltage provided by a first switched-mode converter between a first and a second terminals, wherein: a second reversible buck-type switched-mode converter is powered with said D.C. voltage; a capacitive dividing bridge connects said first and second terminals, the midpoint of the capacitive dividing bridge corresponding to the output of the second converter and defining a third terminal of provision of an intermediary potential; and said two power supply voltages are respectively sampled between the first and third and between the third and second terminals.

Abstract: A coupled inductor includes a ladder magnetic core including two opposing rails extending in a lengthwise direction and joined by a plurality of rungs. The coupled inductor further includes a respective winding wound around each of the plurality of rungs. The plurality of rungs are divided into at least two groups of rungs, and a lengthwise separation distance between adjacent rungs in each group of rungs is less than a lengthwise separation distance between adjacent rungs of different groups of rungs.

Abstract: A control device is disclosed, having a signal generating circuit and a mode decision circuit. The signal generating circuit is used to generate a first control signal and a second control signal according to an output voltage of a buck-boost converter. The first control signal is used to conduct a first switch and a second switch of the buck-boost converter. The second control signal is used to conduct a third switch and a fourth switch of the buck-boost converter. When the duty cycle of the first control signal is greater than a first predetermined value and the duty cycle of the second control signal is less than a second predetermined value, the mode decision circuit configures the signal generating circuit to generate the first control signal and the second control signal with substantially the same duty cycle.

Abstract: DC to DC converters are described that include two converters interconnected and operated to mitigate at least some of the effects of low duty cycle operation.

Abstract: A regenerative load electric power management system can include a system bus, an input filter coupled to the system bus, a first bidirectional solid state power controller coupled to the system bus, a motor drive inverter coupled to the input filter, a second bidirectional solid state power controller coupled to the motor drive inverter, a bidirectional direct current DC-DC converter coupled to the second bidirectional solid state power controller and an energy storage bus coupled to the bidirectional DC-DC converter, the energy storage bus providing access to an energy storage device.

Abstract: A control circuit and method for a buck-boost switching converter provides a mode determinative circuit to judge the timing of an operation under buck-boost mode based on the input voltage, the output voltage and the mode reference voltage; meanwhile, the control signal generating circuit is provided to turn off the second switch during the first switch being on, turn on the second switch during the first switch being off, turn off the fourth switch during the third switch being on, turn on the fourth switch during the third switch being off, wherein the duty cycles of the first and third switches are identical, and duty cycles of the second and fourth switches are identical.

Abstract: A bootstrap circuit for a voltage converter includes a bootstrap capacitor, a stable current module for generating a stable output current according to a stable output voltage, a current mirror module having a first branch circuit for generating a current signal according to the stable output current, and a charge module including a cascode transistor module including a plurality of transistors serially connected and a charge resistor for generating a conduction voltage according to the current signal, and an output circuit coupled to the current mirror module and the cascode transistor module for outputting the conduction voltage to charge the bootstrap capacitor.

Abstract: A DC-to-DC, buck-boost voltage converter includes a duty cycle controller configured to generate control signals for a buck driver configured to drive first and second buck switching transistors at a buck duty cycle and to generate control signals for a boost driver configured to drive first and second boost switching transistors at a boost duty cycle. The duty cycle controller includes at least a duty cycle timer and an offset timer where the duty cycle controller applies the duty cycle timer and the offset timer to control transitions between the buck, the buck-boost and the boost operation modes of the voltage converter.

Abstract: There is provided a DC-DC converter circuit with which conduction loss between switching elements is lower than in the conventional art, which affords an increase in power conversion efficiency. A DC-DC converter circuit includes a first switching element including a first semiconductor switch and a first diode, a second switching element including a second semiconductor switch and a second diode, an inductor connected between the cathodes of the first and second diodes, and a third switching element and a fourth switching element provided so as to face in mutually opposite directions on the anode sides of the first and second diodes, wherein a first voltage supply is connected between the cathode side of the first diode and the anode side of the second diode, and a second voltage supply is connected between the anode side of the first diode and the cathode side of the second diode.

Abstract: In a power supply system, reducing influence of a noise etc., optimal electric power is supplied corresponding to power consumption of a receiving side load, and power consumption is decreased greatly. When a potential difference detector 12 detects that a power supply voltage of the receiving side load is decreased lower than a lower limit voltage threshold or increased higher than an upper limit voltage threshold, a burst interval setting unit sets up a burst signal of a pulse width corresponding to the detection result. A burst signal generator generates a burst signal based on the setup, and excites a control primary inductor. A burst signal detector generates a pulse signal in response to electromotive force of a control secondary inductor.

Abstract: A system and method for regulating power flow and limiting inductor current in a bidirectional direct current (DC)-to-DC converter is provided. In one aspect, a feedback circuit is provided to control power flow and/or limit inductor current based on the input/output voltage and/or current conditions in the bidirectional DC-DC converter. During a boost mode of operation, the duty cycle of a low-side switch within the bidirectional DC-DC converter is reduced, based on an analysis of the high-side voltage and positive inductor current. Further, during a buck mode of operation, the duty cycle of the low-side switch is increased, based on an analysis of the low-side voltage and negative inductor current. Moreover, the duty cycle of the low-side switch is adjusted, such that, the high-side voltage, low-side voltage and inductor current (in both directions) do not exceed preset threshold and the bidirectional DC-DC converter returns to a steady state.

Abstract: In accordance with some embodiments, a buck-boost circuit is contemplated which is bi-directional. That is, the buck-boost circuit be configured to produce a load voltage for a load responsive to a source voltage from a voltage source, and the buck-boost circuit may also be configured to produce a charging voltage for the voltage source responsive to a second voltage source connected to the load. In an embodiment, the buck-boost circuit may be operating in boost mode when providing the load voltage and may be operating in buck mode when providing the charging voltage.

Abstract: The configurations of a single-phase dual buck-boost/buck power factor correction (PFC) circuit and a controlling method thereof are provided in the present invention. The proposed circuit includes a single-phase three-level buck-boost PFC circuit receiving an input voltage and having a first output terminal, a neutral-point and a second output terminal for outputting a first and a second output voltages, a single-phase three-level buck PFC circuit receiving the input voltage and coupled to the first output terminal, the neutral-point and the second output terminal, a first output capacitor coupled to the first output terminal and the neutral-point, a second output capacitor coupled to the neutral-point and the second output terminal, and a neutral line coupled to the neutral-point.

Abstract: A controller and an output filter for a power converter, and a power converter employing at least one of the same. In one embodiment, the controller includes an error amplifier with first and second input terminals coupled to one of an operating characteristic and a reference voltage of the power converter, and a switch configured to couple the first and second input terminals to one of the operating characteristic and the reference voltage as a function of a power conversion mode of the power converter. In one embodiment, the output filter includes an output filter capacitor with a first terminal coupled to a first output terminal of a power converter, and an output filter inductor coupled between a second terminal of the output filter capacitor and a second output terminal of the power converter.

Abstract: A zero voltage switching (ZVS) technique for use in isolated and non-isolated switching power converters and regulators, e.g. based upon buck, boost, buck-boost, and double-clamped topologies is disclosed. During a reverse energy phase of the converter operating cycle, energy is transferred in reverse from the load or the clamp capacitor to the inductor, allowing the current in the inductor to increase in magnitude with a reverse polarity, building up reverse energy. The reverse energy may be used for charging and discharging parasitic and other circuit capacitances for ZVS. The reverse energy phase is adjusted based upon circuit operating conditions, so that the amount of energy stored in the inductor L at the end of the reverse energy phase is approximately equal to, but preferably no greater than, that required to turn the switches ON at substantially zero voltage. Thus full ZVS may be achieved under a wide variety of operating conditions without incurring unnecessary losses.

Abstract: To provide a DC/DC converter capable of down-sizing magnetic components and varying boosting and bucking ratios, and a bidirectional boosting-bucking operations, a bidirectional boosting-bucking magnetic-field cancellation type of DC/DC converter (10) is provided which includes: a first voltage side port (P1), a second voltage side port (P2); a common reference terminal (CP), a smoothing capacitor (C1), four switching elements (SW1, SW2, SW3, SW4), an inductors (L1, L2), a magnetic-field cancellation type transformer T including a primary winding (L3) and a secondary winging (L4), four switching elements (SW5, SW6, SW7, SW8), and a smoothing capacitor (C2).

Abstract: A boost circuit is used for power factor correction (PFC). In a low power application, transition mode control is utilized. However, switching frequency varies with different input voltages, and over a wide input voltage range, the switching frequency can become too high to be practical. To address this issue, a boost circuit is provided whose effective inductance changes as a function of input voltage. By changing the inductance, control is exercised over switching frequency.

Abstract: A supply circuit (1) comprising an inductor (2) coupled to switching means (7) and comprising a capacitor (4) is provided with an impedance (3) located between the inductor (2) and the capacitor (4), with a current injector (5) and with a feedback loop comprising a converter (6) for controlling the current injector (5) for compensating a ripple in an output voltage across the capacitor (4). The impedance (3) allows injection of a compensating current at a location different from an output location. This increases a number of possible detections of ripples in the output voltage and allows a ripple in an output voltage to be detected even in case of loads introducing much noise across the capacitor (4). The converter (6) detects a detection signal via the impedance (3) by measuring a voltage across the impedance (3) or across a serial circuit comprising the impedance (3) and the capacitor (4). The impedance (3) comprises a resistor or a further inductor.

Abstract: The present invention provides a DC-DC converter including: a first series circuit which is connected to the two ends of a direct-current power source Vi, and in which a first switching element Q1 and a second switching element Q2 are connected together in series; a control circuit 10 configured to alternately turn on and off the first switching element and the second switching element; a second series circuit which is connected to the two ends of the first switching element, and in which a first capacitor Ci, a first reactor Ls and a second reactor Ll having a larger value than the first reactor are connected together in series; and rectifying/smoothing circuits (Do, Co) configured to rectify and smooth a voltage between the two ends of the second reactor, and to output a direct-current output voltage.

Abstract: Embodiments of the invention relate generally to power management and the like, and more particularly, to an apparatus, a system, a method, and a computer-readable medium for providing power controlling functionality to generate configurable power signals and to deliver power during fault conditions. In at least some embodiments, a power control unit can generate power signals having configurable attributes as a function of a mode of operation, a fault type, and the like.

Abstract: An actuator control system includes a controller and a buck-boost circuit. The controller is configured to direct power from a power source to an actuator. The actuator is coupled to a control device to apply a force related to operation of a vehicle. The buck-boost circuit is configured to direct excess power generated by the actuator to an energy storage device when an actuator power level satisfies an anticipated power level.

Abstract: Provided is a DC-DC converter capable of reducing not only a turn-off loss but also a turn-on loss. A snubber capacitor has one end connected to an anode of a step-up diode, a current input end of a step-up switching element and a main reactor. A first snubber diode has a cathode connected to other end of the snubber capacitor, and an anode connected to a cathode of the step-up diode. A second snubber diode has an anode connected to the cathode of the first snubber diode and other end of the snubber capacitor. A snubber reactor has one end connected to the anode of the first snubber diode, and other end connected to a cathode of the second snubber diode.

Abstract: A switched-mode converter includes a first magnetic circuit including a first inductive element, coupled to at least one second inductive element and electrically coupled in series with the second element and with a first diode between a first one of two input terminals and a first one of two output terminals; a first switch coupled in series with a third inductive element between a second terminal of the first inductive element and a second input terminal, a common node between the first switch and the third inductive element being connected to one of the output terminals by a second diode; and a circuit capable of canceling the voltage across the first switch before its turning-on.

Abstract: A device for converting power from a floating source of DC power to a dual direct current (DC) output, the device includes: positive and negative input terminals connectible to the floating source of DC power; and positive and negative, and ground output terminals connectible to the dual DC output that may feed an inverter. The inverter may be either a two or three level inverter. A charge storage device may be connected in parallel to, and charged from, the positive and negative input terminals. A resonant circuit may be also connected between the charge storage device and the dual DC output. The resonant circuit may include an inductor connected in series with a capacitor. The charge storage device may discharge through the resonant circuit by switching through to either the negative output terminal or the positive output terminal.

Abstract: A buck boost converter generates a regulated output voltage responsive to an input voltage and switching control signals. Switching control circuitry generates the switching control signals responsive to the regulated output voltage, a maximum duty cycle signal and a mode signal. Mode control circuitry generates the maximum duty cycle signal and the mode signal responsive to a buck PWM signal and a boost PWM signal, a first clock signal and a second clock signal phase shifted from the first clock signal by a fixed, programmable amount. A phase shifter generates the first clock signal and the second clock signal responsive to a reference voltage and a synchronization signal.