A power management integrated circuit (PMIC) can improve the ramp up speed of a boost converter with the inclusion of a controllable switch that may modify the connection of an output capacitor to reduce the ramp time as the output voltage is ramping to a desired boost setpoint. The switch may be controlled using jump start logic to switch a first plate or terminal of the output capacitor from a ground connection to a voltage supply connection. Once a threshold voltage is reached, the first plate of the capacitor may be switched from the supply voltage to ground. In certain cases, by switching the connection of the output capacitor between ground and a supply voltage based on one or more threshold voltages or a boost setpoint, the time to ramp from an initial voltage to a desired boost setpoint may be reduced.

Methods and apparatus for reducing electromagnetic interference (EMI) in power conversion stage line filter are provided herein. The method, for example, includes determining an estimated ripple voltage or estimated ripple current using a predictive model, generating a ripple cancellation signal of opposite polarity to the estimated ripple voltage or ripple current, while compensating for at least one of magnitude or phase distortions in a signal path, and injecting the ripple cancellation signal into a power supply's line filter to reduce a ripple voltage.

A switching power source device includes a plurality of power source circuits including a first power source circuit corresponding to a first phase of an external power source, and a second power source circuit corresponding to a second phase of the external power source that is different from the first phase; a first switching circuit capable of switching between a plurality of connection modes including a first mode of connecting the second power source circuit to the first phase in parallel with the first power source circuit, and a second mode of connecting the second power source circuit to the second phase; a memory; and a hardware processor coupled to the memory, the hardware processor being configured to open and close a switching element included in the first power source circuit and a switching element included in the second power source circuit, in different phases in the first mode.

A ramp generator for a constant on-time DC-DC converter, wherein the ramp generator is configured to reduce DC offset and smooth transitions between conduction modes. The ramp voltage generator includes a common voltage generator suitable for generating a common voltage; a first ramp voltage generation block suitable for generating a first ramp voltage responsive to a first switching signal and a control signal, wherein the first switching signal resets one or more valley points of the first ramp voltage to one or more valley points of the common voltage; and a second ramp voltage generation block suitable for generating a second ramp voltage responsive to a second switching signal, the first ramp voltage, and the control signal.

A three-level power converter includes a direct current power supply unit including a filter capacitor connected between a high potential line and an intermediate potential line and a filter capacitor connected between the intermediate potential line and a low potential line, and a power conversion circuit that converts a three-level direct current voltage output from the high potential line, the intermediate potential line, and the low potential line into a three-phase alternating current voltage. A controller generates an imbalance signal representing an imbalance between a first capacitor voltage and a second capacitor voltage on the basis of values detected by voltage sensors, and generates a modulation signal for causing the power conversion circuit to perform a two-phase modulation operation on the basis of a superimposed signal obtained by superimposing the imbalance signal on a reference signal of the three-phase alternating current voltage.

A power conversion device can be miniaturized.

A power conversion device includes a power module that performs switching operation, a smoothing capacitor that smooths a voltage ripple caused by the switching operation, a circuit board that controls driving of the power module, a housing that accommodates the power module and the smoothing capacitor, a first fixing member for fixing the power module to the housing, and a second fixing member for fixing the smoothing capacitor to the housing. The circuit board straddles between the power module and the smoothing capacitor, and is fixed by the first fixing member and the second fixing member.

A power conversion device includes a main battery, an auxiliary battery, an inverter circuit, a high-voltage wiring, a smoothing capacitor, a main wiring, a subsidiary wiring, a DC-DC converter and a controller. The DC-DC converter is connected to a high-potential wire of the main wiring, a low-potential wire of the main wiring, a high-potential wire of the subsidiary wiring, a low-potential wire of the subsidiary wiring, the high-potential wire of the high-voltage wiring and the low-potential wire of the high-voltage wiring. The controller is connected to the auxiliary battery and the DC-DC converter. The DC-DC converter is configured to supply a power stored in the smoothing capacitor to the controller through the DC-DC converter such that the controller drives the inverter circuit and that the power stored in the smoothing capacitor is supplied to the motor through the inverter circuit, when a collision of the vehicle is detected.

A converter station for the transmission of electrical power has a diode rectifier with a DC terminal and an AC terminal. At least one transformer is connected to the AC terminal. In order to render the converter station as compact as possible, the diode rectifier is arranged in an insulating material.

A compensating method for a ripple compensation circuit of a power supply is provided. The power supply includes an LLC resonant converter. The LLC resonant converter receives an input voltage and generates an output voltage. Firstly, the output voltage is subtracted from a reference voltage, so that a first error signal is generated. Then, a digital filter is provided to increase a low frequency gain of the first error signal, so that a second error signal is generated. Then, the first error signal and the second signal are added, so that a modulated error signal is generated. Then, a compensation signal is generated to control the LLC resonant converter according to the modulated error signal. Consequently, a low frequency gain of the input voltage is increased and a low frequency ripple of the output voltage is suppressed by an increased voltage loop compensator response.

A power converter apparatus employs an energy recovery auxiliary circuit to suppress overvoltage oscillations and achieve high efficiency in a resonant LLC power converter system having high power density. The power converter apparatus includes an inverter configured to receive a DC input power and produce an AC voltage, a resonant tank including a resonant inductor and a resonant capacitor coupled between the AC voltage and a primary winding of a transformer, a rectifier configured to produce a DC output power coupled to a secondary winding of the transformer. The power converter suppresses overvoltage oscillations on rectifier switches by employing an energy recovery auxiliary circuit to transfer, during a transition period, current from the secondary side to a clamping capacitor conductively coupled to the primary side of the converter. The energy is then recovered during a subsequent power transfer cycle, thereby improving overall efficiency of the power converter.