An isolated switched-mode power converter converts power from an input source into power for an output load. Power switches within a primary-side power stage control the amount of power input to the power converter and, ultimately, provided to the output load. A digital controller on the secondary side of the power converter generates signals to control the power switches. This controller also senses a rectified voltage on the secondary side of the power converter and uses this sensed voltage to detect fault conditions of the primary side. For example, the sensed rectified voltage is used to detect undervoltage or overvoltage conditions of the input power source of the power converter, or faulty power switches within the primary-side power stage.

The invention relates to a circuit apparatus (10) for controlling the current flow of the secondary side (20) of a direct voltage converter, comprising: a controllable switch element (1) having a first connection (1a), a second connection (1c) and a control connection (1b); a snubber circuit, which is electrically coupled to the source connection (1a) and the second connection (1c); and a control circuit (5), which is designed to control a deactivation time of the controllable switch element (1) via the control connection (1b); wherein the control circuit (5) is electrically coupled to the snubber circuit and is designed to control the deactivation time according to an electrical parameter of the coupling.

The present invention relates to a power transmission in a DC-DC converter, in particular a phase-shifted full-bridge DC-DC converter from the secondary side to the primary side. In particular, an additional switching state which can reduce the power dissipation of the switching elements in the DC-DC converter, is provided.

System controller and method for regulating a power converter. For example, the system controller includes a first controller terminal and a second controller terminal. The system controller is configured to receive an input signal at the first controller terminal and generate a drive signal at the second controller terminal based at least in part on the input signal to turn on or off a transistor in order to affect a current associated with a secondary winding of the power converter. Additionally, the system controller is further configured to determine whether the input signal remains larger than a first threshold for a first time period that is equal to or longer than a first predetermined duration.

For power transfer from a first DC part to a second DC part in a dual active bridge (DAB) converter by stepping up a voltage, the second bridge circuit 12 includes a period in which a secondary winding n2 of an insulated transformer TR1 and the second DC part conduct and a period in which ends of the secondary winding n2 of the insulated transformer TR1 are short-circuited in the second bridge circuit 12. A control circuit 13 fixes a phase difference between a first leg a the second leg, variably controls a simultaneous off period of a fifth switching element S5 and a sixth switching element S6, and variably controls a simultaneous off period of a seventh switching element S7 and an eighth switching element S8.

A method includes: wirelessly receiving power with a receiver resonant tank from a transmitting coil; rectifying a receiver voltage by switching first and second legs of a synchronous rectifier based on a zero-crossing of a receiver current flowing through the receiver resonant tank to produce a rectified voltage; and while wirelessly receiving power with the receiver resonant tank, encoding data by causing transitions in a transmitter current flowing through the transmitting coil using the synchronous rectifier, where encoding the data includes: applying a first sudden delay period in a first direction to a first switching of the first and second legs to cause a transition in the transmitter current; and applying a first gradual delay in the first direction to subsequent switching of the first and second legs, where the first gradual delay is gradually incremented by an increment period that is smaller than the first sudden delay period.

The invention relates to a method and to a device for operating a bidirectional voltage transformer connectable to a primary battery and having a primary-side smoothing capacitor, an inductive transformer, and a secondary-side clamping capacitor, wherein, before the primary battery is connected, a voltage at the primary-side smoothing capacitor is matched to a voltage of the primary battery by a cyclical transfer of charge from the secondary-side clamping capacitor. The voltage of the primary-side smoothing capacitor is matchable in this way to the voltage of the primary battery before the primary battery is connected, and current spikes thus avoided during connection of the primary battery.

A transient current in a rectifier circuit is efficiently reduced. In a rectifier circuit, a first rectifier is provided between the first terminal and a second terminal. In the rectifier circuit, when a switch element is turned ON, a primary winding current flows from a power source to a primary winding in a transformer. When the switch element is turned OFF, a second rectifier current flows from a secondary winding in the transformer to a second rectifier. When the second rectifier current flows, a first reverse voltage is applied between the first terminal and the second terminal. The first reverse voltage is a reverse voltage applied instantaneously.

This power converter device is provided with a capacitor for smoothing a voltage entering therein; a first switching unit; a second switching unit; a reactor; an isolated transformer; a second capacitor; and a controller for controlling the switching of the first switching unit and the second switching unit; and the controller converting direct-current power to alternating-current power via the reactor and the isolated transformer, and converting said alternating-current power to direct-current power via the second capacitor; wherein, the controller includes a phase-shift operation unit for taking at least any of first switching control signals as a reference signal, and calculating a phase shift that shifts the phase of the reference signal; and a logic operation unit for performing a logic operation that takes the signal resulting from shifting the phase of the reference signal by exactly the phase shift as input and outputting a second switching control signal.

A space efficient planar transformer can include a coupled inductor circuit that can include a metallic core, a first planar winding comprising a conductive coil having an electrical path encircling a first post of the metallic core, and a second planar winding configured to magnetically couple with the first winding via the metallic core. The second planar winding can have multiple portions. A portion of the second winding can include a first sub-portion comprising a single U-shaped planar conductive trace wrapped about the first post and a second sub-portion comprising a single U-shaped planar conductive trace wrapped about the first post. A layout of the first sub-portion can be oriented opposite a layout of the second sub-portion.