A DC-DC power converter employs a full bridge series resonant converter topology with a resonant tank and two transformers, one before and one after the resonant tank, to obtain a high voltage (e.g., approximately 300V, approximately 1500V or greater) output from a relatively low voltage (e.g., approximately 9V-16V) input, for instance an input from one or more battery cells. DC-DC power converter is operable to output high voltage (e.g., around 300V, 1500V or higher) short duration pulses (e.g., tens of nanoseconds or less). A burst mode control technique provides as good regulation characteristics at light loads. Instead of turning OFF the active switches during an OFF period, the switches are operated at a different frequency (e.g., higher frequency) during the OFF period than a frequency at which the switches are turned ON during the ON period. Auxiliary loads can also be supplied.

In an example, a system includes a single-output flyback/LLC converter adapted to be coupled to an alternating current (AC) power supply. The system also includes a buck regulator coupled to the single-output flyback/LLC converter. The system includes a first LED including an anode coupled to the single-output flyback/LLC converter and a cathode coupled to the buck regulator. The system also includes a second LED including an anode coupled to the single-output flyback/LLC converter and a cathode coupled to a ground terminal.

A DC power supply device capable of preventing voltage oscillation of a power supply path to a motor control device is provided. The DC power supply device includes a power supply unit (such as an AC/DC converter) that outputs a DC and a filter circuit that detects a voltage fluctuation of the DC output from the power supply unit and adjusts impedance of own circuit such that the voltage fluctuation of the DC is prevented based on a detection result.

The application provides a power supply device comprising two input ports disposed at a front end of the power supply device; at least one fan disposed behind the two input ports and two isolated power supplies connected respectively to the corresponding one of the two input ports and disposed behind the two input ports and the at least one fan. Each of the isolated power supplies comprises a main power circuit having at least one module, and each module comprises a PCB and a magnetic element and/or switching devices. The at least one module includes an isolated circuit module comprises a transformer having windings formed by laying copper in the PCB and the magnetic core fixed on the PCB. And at least one fan is configured for heat dissipation of the at least one module.

An OLED driving power source includes a power supply board connected to main board and OLED screen, power supply board includes standby circuit, power supply circuit, first conversion module, second conversion module and switch; after powering on, standby circuit supplies mainboard and power supply circuit, power supply circuit starts first conversion module to output first voltage and second voltage to power mainboard and output HVDC to second conversion module, switch converts first voltage to first enabling voltage to supply OLED screen according to first enabling signal from mainboard; power supply circuit starts second conversion module to convert HVDC into second enabling voltage to power and light up OLED screen, first conversion module comprises bridgeless PFC circuit and auxiliary path LLC control circuit integrated into same semiconductor chip encapsulation, and omitting specific standby circuit, circuit structure is simplified, area of power supply board is reduced, and production cost is reduced.

A smart power system is described. In one or more implementations, the smart power system comprises a microcontroller and a power converter electrically connected to the microcontroller and is configured to convert electrical energy from one form to another. The system also includes a switch element electrically connected to the microcontroller and configured to control distribution of the converted electrical energy to an electrical load. A sense element is electrically connected to the electrical load and to the microcontroller and is configured to monitor the converted electrical energy distributed to the electrical load and to furnish a feedback signal based upon the converted electrical energy. The microcontroller is configured to verify and to monitor the power converter, as well as to control and to monitor distribution of the converted electrical energy to the electrical load based upon the feedback signal.

The insulation deterioration monitoring apparatus comprises a computer on which software is installed. The software causes the computer to execute at least first to fourth processes. In the first process, during stopping of at least one inverter unit, the computer selects one inverter unit out of the stopped inverter units and causes the inverter corresponding to the selected inverter unit to generate a direct current voltage. In the second process, the computer measures the current value of the ground current while the corresponding motor driving inverter generates the direct current voltage. In the third process, the computer records the measured current value of the ground current for each inverter unit in association with the selected inverter unit. Then, in the fourth process, based on the measured current value of the ground current recorded for each inverter unit, the computer analyzes the tendency of insulation deterioration of each inverter unit.

This application provides a motor drive system, a power system, and an electric vehicle, and relates to the field of power electronic technologies. The drive system is configured to drive a motor that uses a power battery pack as a power supply. The power battery pack includes at least two battery modules that are independent of each other, the drive system includes at least two direct current-alternating current DC-AC circuits, and the battery modules one-to-one correspond to the DC-AC circuits. Each battery module is correspondingly connected to an input end of one DC-AC circuit, and an output end of each DC-AC circuit is connected to a corresponding winding of the motor. The DC-AC circuit is configured to convert a direct current provided by the corresponding battery module into an alternating current to drive the corresponding winding of the motor.

A plurality of generators redundantly supply power to AC motors via a main DC bus system having a pair of buses, each of which is connected to each generator by an active front end (AFE) inverter containing an insulated-gate bipolar transistor. Isolated DC/AC inverters are connected to the pair of main buses in pairs, respectively. Each pair of the isolated DC/AC inverters is connected to one of the AC motors with a filter of capacitors and inductors between each inverter and the motor. The AFE inverters and isolated DC/AC inverters galvanically isolate the main buses and enable load sharing among the generators.

A direct current (DC)-DC converter for converting an input voltage to a plurality of output voltages. The DC-DC converter includes an inductor, a plurality of output capacitors, a plurality of output switches, and a bootstrap capacitor. The inductor is configured to be charged by applying the input voltage to the inductor. Each of the plurality of output switches is connected between the inductor and a respective output capacitor of the plurality of output capacitors. The bootstrap capacitor is connected between the inductor and each of the plurality of output switches. The bootstrap capacitor is configured to convert the input voltage to an n.sup.th output voltage of the plurality of output voltages. The input voltage is converted to the n.sup.th output voltage by coupling the inductor to an n.sup.th output capacitor of the plurality of output capacitors through an n.sup.th output switch of the plurality of output switches.