A voltage converter comprises a drive control circuit configured to generate switch control signals and a feedback circuit. The feedback circuit comprises a proportional control and a gain controller. The feedback circuit is configured to receive a sensed output voltage based on an output DC voltage, receive a voltage reference, obtain an input voltage value based on an input DC voltage, and generate an error signal based on a comparison of the sensed output voltage with the voltage reference. The feedback circuit is further configured to obtain a proportional gain value based on the voltage reference and the input voltage value and to generate a proportional value based on the proportional gain value and the error signal.

A control circuit for controlling multi-level buck converter. The multi-level buck converter has N pairs of switches, and N is an integer equal to or greater than 2. The control circuit has a comparing circuit comparing a voltage feedback signal with a reference signal to generate a comparing signal, a selecting circuit receiving the comparing signal to generate N set signals, and N COT controllers. The N set signals take turns to change from inactive state to active state at each rising edge of the comparing signal. Each of the N COT controllers receives output voltage signal, input voltage signal and one corresponding set signal of N set signals to generate a corresponding control signal to control the corresponding pair of switches to perform a complementary on and off switching.

An output terminal of one phase switched capacitor converter is connected to a first output terminal, and an output terminal of the other phase switched capacitor converter is connected to the first output terminal via a second switch, such that the power conversion structure can operate in a mode of two phase switched-capacitor converters in parallel, and a current formed by the operating of only one phase switched capacitor converter flows through the second switch, thus greatly reducing a value of current flowing through the second switch, greatly reducing the on-state loss of the second switch, and improving the efficiency of the power conversion structure, and because the second switch has lower on-state loss and less heat, there is a larger selectivity of the second switch and a reduction of the cost of power conversion structure.

A power converter can include a positive input terminal and a negative input terminal, configured to receive an input voltage; a positive output terminal and a negative output terminal, configured to generate an output voltage; a first power switch and a second power switch, sequentially coupled in series between the positive input terminal and a first node; a third power switch and a fourth power switch, sequentially coupled in series between a second node and the negative input terminal; a first energy storage element coupled between a common terminal of the first power switch and the second power switch and a common terminal of the third power switch and the fourth power switch; a first switched capacitor circuit coupled between the first node and the positive output terminal; and a second switched capacitor circuit coupled between the second node and the positive output terminal.

Various examples are provided for high voltage isolation. The isolation can be provided for discrete non-isolated devices using an electrically isolating substrate that is thermally conductive. In one example, a module includes a plurality of switching devices connected in series; one or more rubber buffer disposed between switching device pairs of the plurality of switching devices; and thermal interfaces disposed between switching devices of the switching device pairs and cooling surfaces of the module, the thermal interfaces electrically isolating the switching devices from the cooling surface. In another example, an extreme fast charger (EFC) station includes an active front end (AFE) module that includes at least one module, where the module is a half-bridge power module. The EFC station can include a dual-active-bridge (DAB) high voltage (HV) module that includes at least one module, where the module is a half-bridge power module.

Disclosed is a DC-DC converter of a power conversion system. comprising first to fourth switches; fifth to eighth switches; a first capacitor connected to the first and second switches; a second capacitor connected to the fifth and sixth switches; a third capacitor connected to the third and fourth switches; a fourth capacitor connected to the seventh and eighth switches; a first inductor connected to a first node between the first and second switches, and a second node between the fifth and sixth switches; and a second inductor connected to a third node between the third and fourth switches, and a fourth node between the seventh and eighth switches, wherein the first and second inductors are coupled inductors, and a fifth node between the second and third switches, and a sixth node between the sixth and seventh switches are electrically equivalent.

Power converters can include a plurality of switching devices and a combination of one or more inductors and one or more flying capacitors. Both boost and buck converters may employ such topologies, and can achieve high efficiency and small size in at least some applications, including those with high conversion ratios. A control circuit can generate a first pair of complementary gate drive signals to drive a first complementary switch pairs and a second pair of complementary gate drive signals to drive a second complementary switch pair. The control circuit can vary a phase shift between the first pair of complementary gate drive signals and the second pair of complementary gate drive signals to regulate the flying capacitor voltage.

This application relates to methods and apparatus for driving a transducer. A transducer driver has a switch network is operable to selectively connect a driver output to any of a first set of at least three different switching voltages. which are, in use, maintained throughout a switching cycle of the driver apparatus. The switch network is also operable to selectively connect the driver output to flying capacitor driver. A controller is configured to control the switch network and flying capacitor driver to generate a drive signal at the driver output based on an input signal, wherein in one mode of operation the driver output is switched between two of the first set of switching voltages with a controlled duty cycle and in another mode of operation the driver output is connected to the flying capacitor driver which is switched between first and second states with a controlled duty cycle.

A battery charging apparatus includes a first converter having an input coupled to an input voltage bus and an output coupled to a first battery, and a second converter having an input coupled to the input voltage bus and an output coupled to the first battery and a second battery through a first bidirectional current blocking switch and a second bidirectional current blocking switch, respectively.

A modulator for a flying-capacitor type multilevel converter receives, at an input, a time-variant reference signal and provides, at an output, a sequence of target levels, to provide switching signals for switching between discrete output levels of the multilevel converter according to the shape of the reference signal. The modulator determines a critical level as an intermediate output level of the multilevel converter which is closest to the level of the reference signal; and outputs only target levels corresponding to output levels different from the critical level.