A circuit comprises an H-bridge circuit that includes a pair of current sources and a plurality of transistors. The H-bridge circuit includes a first output and a second output. One of the current sources is coupled to receive a supply voltage. A control circuit is configured to control, based on a sum of voltages on the first and second outputs, current of at least one of the current sources through at least some of the plurality of transistors.

Provided a DC-DC converter and a two-stage power converter including the same. The DC-DC converter includes a plurality of active switches. Some of the plurality of active switches operate with a variable duty ratio D, and the remaining active switches operate with a fixed duty ratio. An input-output voltage conversion ratio of the DC-DC converter is determined based on the variable duty ratio D and an output of the DC-DC converter is controlled by adjusting the variable duty ratio D.

The present application discloses a multi-port energy storage battery. The multi-port energy storage battery comprises a battery case including a first port, a second port and a third port; a battery module, including a first interface, the first interface is connected to the first port, the battery module is configured to connect an external power supply module via the first port and first interface, so as to charge the battery module; a DC-DC converter, including a second interface and a third interface, the second interface is connected with the first interface, and the third interface is connected with the second port, the DC-DC converter is configured to boost battery voltage to a DC high voltage and then output it through the second port; a DC-AC converter, including a fourth interface and a fifth interface, the fourth interface is connected with the first interface, the fifth interface and the third port.

Methods for operation of a phase-shifted full-bridge topology power converter in a true soft-switching mode, regardless of the value of the leakage inductance of the converter. To achieve this, a process of discharge of the parasitic capacitances across the switching elements from a part of the resonant leg starts after the entire, total energy in the leakage inductance is used, and the voltage across the primary switching elements reaches the specific lower level.

An electric power converter is provided, at low costs and in high efficiency, which also enables voltage conversion to be capable of dealing with sharp load variation, even when input voltage and output current ranges are wide. The converter includes a non-isolated buck-boost converter circuit for outputting a DC voltage by increasing or decreasing a voltage being inputted into the circuit, an isolated converter circuit for outputting a DC voltage to a load by inputting a DC voltage outputted from the non-isolated buck-boost converter circuit, and a control unit for controlling the non-isolated buck-boost converter circuit and the isolated converter circuit, whereby the control unit adjusts using only the non-isolated buck-boost converter circuit, by performing the control of a buck-boost voltage ratio between the voltage inputted thereinto and an output voltage of the isolated converter circuit, so as to make the output voltage coincident with its target value.

Methods for operation of a phase-shifted full-bridge topology power converter in a true soft-switching mode, regardless of the value of the leakage inductance of the converter. To achieve this, a process of discharge of the parasitic capacitances across the switching elements from a part of the resonant leg starts after the entire, total energy in the leakage inductance is used, and the voltage across the primary switching elements reaches the specific lower level.

Techniques for operating a power converter system that includes an LLC resonant converter and a non-inverting buckboost converter that is located in front of the LLC resonant converter are disclosed. In an embodiment, the output voltage of a non-inverting buckboost converter is regulated in response to the input voltage and the output voltage of an LLC resonant converter in order to maintain a desired ratio between the input voltage and the output voltage of the LLC resonant converter. For example, the ratio between the input voltage and the output voltage of the LLC resonant converter is controlled to a desired ratio that matches the turns ratio of the LLC resonant converter's transformer and that may also match (as a second order effect) the ratio of Lr to Lm.

A switching power supply and a method for controlling the switching power supply, the switching power supply includes: an input power supply, a front-stage circuit which includes a first inductor and at least two switch devices, and a post-stage isolated circuit which includes a primary-side switch circuit, a transformer and a secondary-side rectification circuit. One end of the first switch device is connected to a positive electrode of the input power supply, one end of the second switch device and an input-end of the first inductor are jointly connected to another end of the first switch device, another end of the second switch device is connected to a negative electrode of the input power supply, an output-end of the first inductor is connected to the primary-side switch circuit of post-stage isolated circuit, and another end of the primary-side switch circuit is connected to another end of the second switch device.

An electric power converter is provided, at low costs and in high efficiency, which also enables voltage conversion to be capable of dealing with sharp load variation, even when input voltage and output current ranges are wide. The converter includes a non-isolated buck-boost converter circuit for outputting a DC voltage by increasing or decreasing a voltage being inputted into the circuit, an isolated converter circuit for outputting a DC voltage to a load by inputting a DC voltage outputted from the non-isolated buck-boost converter circuit, and a control unit for controlling the non-isolated buck-boost converter circuit and the isolated converter circuit, whereby the control unit adjusts using only the non-isolated buck-boost converter circuit, by performing the control of a buck-boost voltage ratio between the voltage inputted thereinto and an output voltage of the isolated converter circuit, so as to make the output voltage coincident with its target value.

A switching power supply and a method for controlling the switching power supply, the switching power supply includes: an input power supply, a front-stage circuit which includes a first inductor and at least two switch devices, and a post-stage isolated circuit which includes a primary-side switch circuit, a transformer and a secondary-side rectification circuit. One end of the first switch device is connected to a positive electrode of the input power supply, one end of the second switch device and an input-end of the first inductor are jointly connected to another end of the first switch device, another end of the second switch device is connected to a negative electrode of the input power supply, an output-end of the first inductor is connected to the primary-side switch circuit of post-stage isolated circuit, and another end of the primary-side switch circuit is connected to another end of the second switch device.