Abstract: A power supply circuit includes a first switch, a second switch, an inductor, a series circuit, a second resistor, and a control signal circuit. The first and second switches are connected between a first terminal and a second terminal and to each other at an output node. The inductor is connected between the output node and an output terminal. The series circuit is connected in parallel with the inductor and includes a first resistor and a capacitor connected to each other at a common connection node. The second resistor is connected in parallel with the capacitor. The control signal circuit compares a voltage at the common connection node to a reference voltage to generate a control signal for at least the first switch based on the comparison.

Abstract: A multiphase regulator includes a plurality of output phases, each operable to deliver a phase current through a separate inductor to a load connected to the output phases via the inductors and an output capacitor. The multiphase regulator further includes a controller operable to regulate a voltage delivered to the load by adjusting the phase currents delivered to the load by the output phases, and monitor the phase currents delivered to the load by the output phases. The controller is further operable to determine if the monitored phase currents indicate any of the individual output phases, any of the individual inductors or the output capacitor are faulty, even if the total current delivered to the load is within specified limits.

Abstract: A voltage regulator device includes at least one output unit, a current sensing unit, a control unit, at least one transistor driving unit and a pulse width modulation unit. The output unit outputs an output signal. The output unit includes a first transistor, a second transistor and an energy storage element. The second transistor is electronically connected to the first transistor and the energy storage element, respectively. The current sensing unit is electronically connected to a first end and a second end of the energy storage element. The control unit is electronically connected to the current sensing unit and the output unit, respectively. The transistor driving unit is disposed corresponding to the output unit and is electronically connected to the control unit and the output unit. The pulse width modulation unit is electronically connected to the control unit and the transistor driving unit, respectively.

Abstract: A DC to DC converter including a buck converter, a boost converter, and a control unit, wherein the control unit is arranged to calculate an error voltage of the buck converter Verr_buck based on a feedback output voltage Vout_FB of the DC to DC converter and a reference voltage of the buck converter Vref_buck, and wherein the control unit is arranged to calculate an error voltage of the boost converter Verr_boost based on the feedback output voltage Vout_FB of the DC to DC converter and a reference voltage of the boost converter Vref_boost, wherein the reference voltage of the boost converter Vref_boost is shifted by an offset Voffset as compared to the reference voltage of the buck converter Vref_buck.

Abstract: An analog closed-loop, negative feedback system that adapts feedback compensation during operation thereof to improve dynamic performance thereof. Using a pure analog control loop with digital assist provides speed and simplicity of an analog control loop with the flexibility of digital control. Adapting the compensation allows the system to accurately predict and adjust, at all DC operating points, (1) the margin of stability of the converter, against closed loop oscillation, and (2) the frequency-domain and time-domain responses to perturbations in the input voltage and/or the output current. Operational transconductance amplifiers (OTAs) and digitally controlled digital-to-analog converters (IDACs) are used to dynamically change the operating parameters of the analog closed-loop of the negative feedback system. The negative feedback system may be a switch mode power supply (SMPS).

Abstract: A multiphase converter has a plurality of phase circuits and a plurality of phase control circuits. Each phase circuit has a switch having a control terminal, and the control terminal of the switch may be configured to receive a drive signal. Each phase control circuit may be corresponding to one of the phase circuits, and each phase control circuit may be configured to provide a phase control signal to adjust an ON-time period or a reference signal for the corresponding phase circuit. The phase control signal may be responsive to the drive signal of the corresponding phase circuit.

Abstract: Each of unit blocks (UB1, UB2) is provided with an output circuit (20) including a serial circuit of FETs (21) and (22). A power supply circuit (1b) can operate in a first mode for generating an output voltage (Vo) using only one of the output circuits (20) or in a second mode for generating the output voltage (Vo) using two output circuits (20) by synchronous/parallel driving. When switching from the first mode to the second mode, start of the synchronous/parallel driving from a state where the FET (22) on the low voltage side is turned on is inhibited (start of the synchronous/parallel driving is waited until the FET (21) on the high voltage side is turned on).

Abstract: A current sensing apparatus for a voltage converter apparatus includes a circuit selection module for generating a circuit selection result according to a clock signal and a duty cycle signal; a current sensing module coupled to the circuit selection module, an up-bridge circuit and a down-bridge circuit of the voltage converter apparatus for measuring an up-bridge conduction current and a down-bridge conduction current according to the circuit selection result; and a current generation module coupled to the current sensing module and a slope compensation circuit of the voltage converter apparatus for generating a sensing voltage according to a slope compensation current, the up-bridge conduction current or the down-bridge conduction current, so as to adjust the duty cycle signal of the controller. The current sensing apparatus utilizes the duty cycle signal to drive the voltage converter apparatus.

Abstract: A switching converter providing an output voltage has at least one switch and a control circuit. The control circuit has a slope compensation module, an output correction module and a control module, wherein the slope compensation module provides a slope compensation signal, the output correction module provides a voltage trim signal based on the slope compensation signal, and the control module provides a control signal to control the at least one switch based on the slope compensation signal, the voltage trim signal, a reference signal, the output voltage and an error compensation signal provided based on a difference between the output voltage and a set target of the output voltage.

Abstract: Methods, systems, circuits, and devices for power-packet-switching power converters using bidirectional bipolar transistors (BTRANs) for switching. Four-terminal three-layer BTRANs provide substantially identical operation in either direction with forward voltages of less than a diode drop. BTRANs are fully symmetric merged double-base bidirectional bipolar opposite-faced devices which operate under conditions of high non-equilibrium carrier concentration, and which can have surprising synergies when used as bidirectional switches for power-packet-switching power converters. BTRANs are driven into a state of high carrier concentration, making the on-state voltage drop very low.

Abstract: The present disclosure provides a DC-DC boost converter operating in a pulse frequency modulation mode. The DC-DC boost converter includes an inductor, a first switch, a capacitor, a second switch and a control circuit. The inductor is coupled between an input voltage node and a phase node. The first switch is coupled between the phase node and an output voltage node. The capacitor is coupled between the output voltage node and a ground. The second switch is coupled between the phase node and the ground. The control circuit controls the conducting status of the first switch and the second switch. The control circuit detects whether the voltage at the phase node is changed. When the voltage at the phase node is not changed during a predetermined time interval, the control circuit turns on the first switch. Therefore, the noise with frequency could be hear by human is avoided.

Abstract: A smart photovoltaic (PV) module includes a PV laminate configured to receive solar energy and provide a direct current (DC) power output, and a DC power manager (DCPM) electrically connected to the PV laminate to receive the DC power output of the PV laminate. The DCPM includes a DC/DC power converter configured to receive the DC power output from the PV laminate and provide a module DC power output, and a controller operatively connected to the DC/DC power converter. The controller is configured to control operation of the DC/DC power converter to produce the module DC power output at substantially the maximum power point of the PV laminate.

Abstract: A switching power supply device wherein an input voltage is stepped-up by first and second switching elements that are driven on and off in a complementary way, thus obtaining a stabilized output voltage. The switching power supply device includes a comparator that detects fluctuation in an operating reference potential of the second switching element accompanying fluctuation in the input voltage, and a drive signal generator circuit that carries out a logical operation on an output control signal, a dead time signal, and the output signal of the comparator, thus generating first and second drive signals that determine the on-state time of the first and second switching elements.

Abstract: An output ripple voltage average amplitude of a switch mode DC-DC converter is dynamically maintained. The converter has a switch and an output filter. By varying a switching period (TPERIOD) of the switch, VRIPPLE is maintained at a substantially constant value over a first range of converter input voltages and a second range of switch duty cycles. Where the output filter includes an inductor having inductance (L) and a capacitor having capacitance (C) the average amplitude of VRIPPLE is dynamically maintained by varying TPERIOD with respect to switch duty cycle (D) and input voltage (VIN) so as to approximately satisfy the following relationship: TPERIOD=(VRIPPLE*8*L*C)0.5/(VIN*(D?D2)).5.

Abstract: The present invention provides a multi-phase switching regulator and a droop circuit for use in the multi-phase switching regulator. The multi-phase switching regulator generates pulse width modulation (PWM) signals according to an output voltage and a droop signal, to drive a plurality of switching sets to convert an input voltage to the output voltage. The droop circuit detects the sum of the currents generated by the plurality of switching sets and provides the droop signal which is related to the sum of the currents to the multi-phase switching regulator. The droop signal can be used for over current protection (OCP) or for the droop control.

Abstract: An off-line regulator has a rectification circuit configured to rectify an AC line voltage into a rectified line voltage, a pass device coupled between the rectified line voltage and a first capacitor, and a converter. The pass device is configured to be turned ON or OFF according to a comparison signal indicating whether the rectified line voltage is over a threshold voltage. The first capacitor delivers an interim voltage into the converter which supplies power to a load. Wherein a second capacitor coupled across a driver which driving the pass device is charged by the first capacitor when the comparison signal is at a first state, and the driver is boosted when the comparison signal is at a second state.

Abstract: A controller for controlling operation of a switching regulator including a modulator, a discontinuous conduction mode (DCM) controller, an audible DCM (ADCM) controller, and a sub-sonic discontinuous conduction mode (SBDCM) controller. The modulator generally operates in a continuous conduction mode. The DCM controller modifies operation to DCM during low loads. The ADCM controller detects when the switching frequency is less than a super-sonic frequency threshold and modifies operation to maintain the switching frequency at a super-sonic frequency level. The SBDCM controller detects a sub-sonic operating condition during ADCM operation and responsively inhibits operation of the ADCM mode controller to allow a SBDCM mode within a sub-sonic switching frequency range. The SBDCM operating mode allows for efficient connected standby operation. The SBDCM controller allows operation to return to other modes when the switching frequency increases above the sub-sonic level.

Abstract: Soft-switching is performed to switch a switching state to an ON state by controlling a delay time of a timing at which a main switch switches to an ON state relative to a timing at which a sub-switch switches to an ON state. Controllability of soft-switching decreases as a result of variations in time difference of a command for switching the main switch to the ON state and the actual switching of the switching state. To set a delay time suitable for performing soft-switching based on the variations in time difference, an EEPROM is provided that stores therein correction data for the delay time. The delay time of the timing of the command for switching the main switch to the ON state relative to the timing of the command for switching the sub-switch to the ON state is set based on the correction data.

Abstract: According to one embodiment, a synchronous buck converter comprises a multi-mode control circuit for detecting a load condition of a variable load, an output stage driven by the multi-mode control circuit, wherein the variable load is coupled to the output stage, and a feedback circuit connected between the output stage and the multi-mode control circuit. The multi-mode control circuit is configured to adjust a current provided by the output stage to the variable load based on the load condition. In one embodiment, the multi-mode control circuit selectably uses one of at least a first control mode and a second control mode according to the load condition, wherein the first control mode is a pulse-width modulation (PWM) mode selected for switching efficiency when the load condition is heavy and the second control mode is an adaptive ON-time (AOT) mode selected for switching efficiency when the load condition is light.

Abstract: DC to DC converters and pulse width modulation controllers are presented with compensation circuitry to mitigate discontinuous conduction mode (DCM) undershoot and continuous conduction mode offsets in inductor current emulation information by providing compensation signals proportional to the output voltage and the converter off time (Toff) when the low side converter switch is actuated.

Abstract: A modular high-frequency converter includes submodules, each having an input-side half bridge and a DC link circuit with a DC link capacitance connected in parallel to the half bridge. A DC link circuit voltage drop across the DC link capacitance of each submodule is controlled to a target voltage by adjusting a duty cycle with a closed-loop control structure having a pilot control and a downstream closed-loop error control. Within the framework of the pilot control, a target value for each duty cycle and a target value for the supply current are determined, using a mathematical model of the converter, based on the load-side output currents flowing out of the DC link voltage circuits and on target values of the DC link circuit voltages. Switch position parameters, which map the effect of the switch positions of the input-side half bridges, are each replaced by an associated duty cycle.

Abstract: A novel method to synchronize the switching frequency of hysteretic power converters is presented. The method includes the generation of a clock signal and the injection of a periodic disturbance signal operating at the frequency of the generated clock in the main loop of the converter to synchronize the hysteretic power converter to switch at the frequency of the clock. The presented approach provides significant advantages with respect to the more traditional means of utilizing Frequency Lock Loop, Phase Lock Loop or Delay Lock Loop circuits, mainly for its simplicity, faster locking and much reduced phase error. The switching frequency can be higher or lower than the free running frequency of the power converter provided that the free running frequency is close enough to the desired switching frequency. The method is presented for buck and boost hysteretic high frequency switching power converters.

Abstract: A boost converter includes an input terminal and an output terminal. A first switch is connected between a first intermediate node and a reference potential node. An inductive component is connected between the input terminal and the first intermediate node. A rectifying component is connected between the first intermediate node and a second intermediate node. A multi-state module is connected between the second intermediate node and the output terminal, and has at least a low resistance state and a high resistance state. A control module is coupled to the output terminal, the first switch and the multi-state module, and is operable in response to an output voltage to control the first switch and the multi-state module so that the first switch is open and the multi-state module is in the high resistance state if the output voltage is lower than a threshold value.

Abstract: A dual-polarity multiple-output boost converter that includes an inductor coupled in series between a high-side switch and a low-side switch. A first terminal of the inductor is coupled to an output of the high-side switch and the second terminal of the inductor is coupled to an input of the low side switch, with an output of low-side switch being coupled to a reference terminal. A plurality of outputs provide a plurality of output voltages, including a first plurality of outputs to provide a first plurality of different output voltages having a first polarity and at least one second output to provide at least one second output voltage having a second polarity opposite the first polarity. A control circuit is coupled to the high-side switch and the low-side switch to control an on-time of the high-side switch and the low-side switch.

Abstract: A controller used in a buck-boost converter includes a clock generator, an error amplifying circuit, a comparing circuit, a proportional sampling circuit, a logic circuit, a pulse width increasing circuit, first and second driving circuits. Based on a clock signal generated by the clock generator, the proportional sampling circuit samples the difference between a current sensing signal and a compensation signal generated by the error amplifying circuit, and generates a proportional sampling signal. The pulse width increasing circuit generates a sum control signal based on the proportional sampling signal and a logic control signal generated by the logic circuit, wherein a modulation value adjusted by the proportional sampling signal is added to the pulse width of the logic control signal to generate the pulse width of the sum control signal. The first and second driving circuits generate driving signals based on the sum control signal and the logic control signal.

Abstract: Provided is a voltage regulator having satisfactory transient response characteristics. The voltage regulator includes: a first amplifier for detecting that undershoot occurs in an output voltage; a second amplifier for detecting that overshoot occurs in the output voltage; a first constant current circuit for increasing a bias current of an error amplifier circuit by a first amount for a first time period in response to a signal determined based on one of an output signal of the first amplifier and an output signal of the second amplifier; a second constant current circuit for increasing the bias current of the error amplifier circuit by a second amount larger than the first amount for a second time period shorter than the first time period in response to a signal determined based on the output signal of the first amplifier; and a first switch circuit for pulling up a gate of an output transistor in response to a signal determined based on the output signal of the second amplifier.

Abstract: A multiphase power converter includes one or both of a phase control circuit and a valley switching locking circuit. The phase control circuit measures a phase difference between a first phase circuit and a second phase circuit and varies an on-time of a drive switch of the second phase circuit to produce and maintain a predetermined phase difference between the first phase circuit and the second phase circuit. When the multiphase power converter is operating in a discontinuous mode of operation, the valley switching locking circuit counts the number of zero crossings of an input current of the first phase circuit and blocks a second zero crossing detection signal from a waveform generator (i.e., PWM driver) associated with the second phase circuit until an input current of the second phase circuit has as many zero crossings as that of the first phase circuit input current.

Abstract: The invention disclosed buck power factor correction system. The system includes: a first storing device, for storing and discharging energy; a first converter device, coupled to the first storing device, for transferring and converting energy; a second storing device, coupled to the first storing device, for storing and discharging energy; and a second converter device, coupled to the second storing device, for transferring and converting energy.

Abstract: A method of generating spurious-noise-free power from a switching device. The method includes generating an oscillating signal in the form of a series of pulse trains, and randomly changing the switching frequency, or the on-time, or both the switching frequency and the on-time of the switching device. The method further includes causing the switching device to change from a first frequency to a second frequency only at the end of a pulse train of the first frequency, and causing the second frequency to start at the beginning of its first pulse train such that no switching duty-cycle disturbance at the time of the change from first to second frequency. In a particular embodiment, the method further generates spurious-noise-free power from a switching device by implementing a relationship between the different switching frequencies involved such that spurious-noise-free operation is achieved.

Abstract: A switching regulator switch between an input terminal and an output terminal; a second switch between the output terminal and ground; a switching-time control circuit to generate a first signal when a first period corresponding to a ratio of ON-period of the first switch to a sum of those of the switches has elapsed from a reset-release timing and a reset signal when a second period longer than the first period has elapsed from the rest-release timing; a comparator to generate a second signal when a feedback voltage is smaller than a reference voltage; and a switch control circuit to control the switches so that the first switch is turned off and the second switch is turned on in response to the first signal, and the second switch is turned off and the first switch is fumed on in response to the second signal.

Abstract: An error determination module determines a voltage error based on an output voltage of a DC to DC converter, an estimated output voltage of the DC to DC converter, and a product of a predetermined delay value and a difference between a duty cycle and a target voltage. A capacitor current determination module determines a capacitor current based on the voltage error. A capacitor voltage determination module determines a capacitor voltage based on the voltage error. A duty cycle module sets the duty cycle for a sampling period based on the capacitor current and the capacitor voltage. A pulse width modulation (PWM) module controls a switching duty cycle of the DC to DC converter based on the duty cycle.

Abstract: Provided is a voltage regulator including a soft-start circuit having a small area and capable of suppressing an inrush current by causing a reference voltage circuit to rise gently with time. In the soft-start circuit, a capacitor is connected to an output of a reference voltage circuit driven by a constant current of a constant current circuit, and hence the soft-start circuit can raise a reference voltage gently to prevent an inrush current with a small area. After the end of a soft-start period, the constant current circuit is disconnected, and the reference voltage circuit is driven by a power source. Thus, the operation becomes stable.

Abstract: A timing generator and a timing signal generation method for a power converter are provided. The timing generator includes an adjusting circuit and a timing generation unit. The adjusting circuit receives an error signal related to an output voltage of the power converter. The adjusting circuit generates an adjusting signal according to the error signal and a delay circuit. The timing generation unit generates a timing signal according to the error signal, the adjusting signal and a control signal. A width of the timing signal is changed with the error signal and the adjusting signal. Accordingly, the timing generator adjusts On-time/Off-time in response to a transient response.

Abstract: A drive controller for driving an inductive load connected to a node between first and second switches connected in series with a direct current voltage source includes a first diode, a series circuit of a second diode and an inductor, and a control circuit. The first diode is a parasitic diode of the first switch and connected in antiparallel with the first switch. The series circuit is connected in parallel with the first diode. The control circuit drives the inductor load by applying a control voltage to the first switch before applying a first ON-voltage to the second switch. The first ON-voltage turns ON the second switch. The control voltage is greater than zero and less than a second ON-voltage. The second ON-voltage turns ON the first switch. The control voltage causes the first switch to operate in weak inversion.

Abstract: An electronic device, including a first limiter including a first transistor configured to be coupled with a first side of a channel to a first output node of a non-ideal voltage source having an inner impedance greater zero in order to limit the voltage at the first output node by drawing a current from the first output node. The second side of the channel of the first transistor is coupled to a capacitor so as to supply a current from the first output node to the capacitor, if the voltage level at the output node reaches or exceeds an upper limit.

Abstract: A switching regulator that includes a high-side MOSFET, a low-side MOSFET, a high-side driver circuit, a low-side driver circuit, and a capacitive coupling circuit. An output of the high-side driver circuit is coupled to a gate of the high-side MOSFET to control the high-side MOSFET to be substantially depleted during a first operational phase and to be substantially enhanced during a second operational phase. An output of the low-side driver circuit is coupled to a gate of the low-side MOSFET to control the low-side MOSFET to be substantially enhanced during the first operational phase and to provide a regulated drain-to-source current during the second operational phase. The capacitive coupling circuit is coupled to an input of the high-side driver circuit and the gate of the low-side MOSFET and decreases the regulated drain-to-source current during a transition from the first operational phase to the second operational phase.

Abstract: A semiconductor apparatus includes a first structural body including a first temperature voltage generation unit configured to generate first and second temperature voltages which have different voltage level variations according to a temperature variation, in response to a temperature measurement command, and a first temperature information determination unit configured to generate first temperature information depending on a difference between levels of the first and second temperature voltages; and a second structural body including a second temperature voltage generation unit configured to generate a third temperature voltage and a fourth temperature voltage which have different voltage level variations according to a temperature variation, when a predetermined time elapses after the first and second temperature voltages are generated from the first structural body, and a second temperature information determination unit configured to generate second temperature information depending on a difference betwe

Abstract: Embodiments of the present invention provide systems and methods for reducing switching frequency variation in a hysteretic switching regulator. Embodiments of the present invention provide a new duty cycle controller for a switching regulator incorporating a new Frequency Lock Loop (FLL) for controlling the hysteresis of a comparator, and this hysteresis variation directly controls the switching frequency. The FLL of the present invention advantageously maintains a fixed frequency operation for a switching regulator while not affecting the transient response or stability of the main loop because it only changes the hysteresis of the fast comparator and does not introduce delays in the main loop of the switching regulator. Thus, the FLL of the present invention advantageously maintains a fixed switching frequency while causing a minimal impact to the switching regulator.

Abstract: The disclosure relates to a voltage generator for providing an output voltage in accordance with a received target signal, the voltage generator comprising: a resonant converter configured to receive an input voltage, the resonant converter comprising: a first switch; a second switch connected in series with the first switch between the input voltage and ground (GND); a resonant tank associated with the second switch; an output capacitor coupled to the resonant tank and configured to provide an output voltage; and a rectifier configured to allow charge to flow in a single direction between the resonant tank and the output capacitor; and a controller configured to receive the target signal and to set an operating parameter of the resonant converter in accordance with a difference between an output value which is related to the output voltage and the target signal.

Abstract: A circuit arrangement including a first branch, a second branch and a switching feedback structure is provided. The switching feedback structure may be coupled to the first branch and to the second branch. The switching feedback structure may be configured to adjust a current in the second branch to track a current in the first branch.

Abstract: The present invention concerns a method for controlling an output voltage of a boost converter composed of n bridge devices connected in series, each bridge device being composed of plural switches and a capacitor, the switches being controlled by periodical patterns decomposed in time intervals.

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: The present invention is applicable to the field of direct current conversion, and provides a DC-DC converter. In the present invention, a DC-DC converter including a triangular wave generation module and a switch control module is adopted. The triangular wave generation module generates a triangular wave signal according to voltages at both ends of an energy storage inductor L1, and the switch control module outputs a control level according to its internally generated clock signal and the triangular wave signal to control a switching operation of a PMOS power tube and an NMOS power tube according to a preset switching frequency.

Abstract: A system and method are provided for controlling a soft-switched modified buck regulator circuit. A voltage (Vx) across or a current through a pull-down switching mechanism within the modified buck regulator circuit is sensed when the pull-down switching mechanism is enabled, where the pull-down switching mechanism is coupled to an upstream end of an inductor and is coupled in parallel with a capacitor. A target time when the pull-down switching mechanism will be disabled (tlf) is computed and the pull-down transistor is disabled at the computed target time.

Abstract: Each of unit blocks (UB1, UB2) is provided with an output circuit (20) including a serial circuit of FETs (21) and (22). A power supply circuit (1b) can operate in a first mode for generating an output voltage (Vo) using only one of the output circuits (20) or in a second mode for generating the output voltage (Vo) using two output circuits (20) by synchronous/parallel driving. When switching from the first mode to the second mode, start of the synchronous/parallel driving from a state where the FET (22) on the low voltage side is turned on is inhibited (start of the synchronous/parallel driving is waited until the FET (21) on the high voltage side is turned on).

Abstract: There is provided a power supply, including, a boost converter unit including a first boost converter having a first inductor, a first diode, and a first switching element, and a second boost converter having a second inductor, a second diode and a second switching element, an input voltage sensing unit sensing an input voltage applied to the boost converter unit, a control unit selecting one of a first boost mode in which current is divided between the first inductor and the second inductor, based on the input voltage, and a second boost mode in which current flows through the first inductor and the second inductor in this order, based on the input voltage, and a switching unit selecting one of the first boost mode and the second boost mode, based on the selection of the control unit.

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: A DC-DC converter of a liquid crystal display (LCD) apparatus is provided comprising a first capacitor connected between a first node and a second node, a second capacitor connected between a third node and a fourth node, and a first diode connected between the input terminal and the first node.

Abstract: A charge and discharge signal circuit includes: high side transistors connected in series; low side transistors connected in series; high side drive circuits; low side drive circuits; and a drive signal generation circuit, wherein each drive circuit includes: a high side level shifter; a high side capacitor switch string of a capacitor and a switch element connected in series, being connected in parallel with the high side transistor; and a high side drive part, to which an output of the high side level shifter is supplied, and each of the low side drive circuits includes: a low side level shifter; a low side capacitor switch string of a capacitor and a switch element connected in series, being connected in parallel with the low side transistor; and a low side drive part, to which an output of the low side level shifter is supplied.

Abstract: A converter circuit may include: a first node receiving an input voltage; a second node providing an output voltage; a first inductor between the first node and a third node; a capacitor between the third node and a first terminal of a diode, the other terminal of the diode providing said output voltage; a second inductor between the first terminal of the diode and common; an electronic switch acting between the third node and common; a first current generator acting between the first node and the switch to drive the switch to the conductive condition; and a second current generator sensitive to the current through the switch in the “on” condition and/or the output voltage on the second node, the second current generator to draw current from the first current generator to drive the switch to the non-conductive condition.