The converter includes: an input direct current (DC) power supply, a main power transistor, an auxiliary power transistor, a first capacitor, a transformer, and a controller. The first capacitor is connected in series to the transformer to form a series circuit. The series circuit is connected in parallel to the auxiliary power transistor. A source of the main power transistor is connected to a drain of the auxiliary power transistor. A source of the auxiliary power transistor is connected to another electrode of the input DC power supply. An input negative electrode of the input DC power supply is grounded. The controller is configured to: monitor a value of a current on the transformer to obtain a quantity of times that the value of the current on the transformer reaches a specified current threshold.

A charging system has: a number of connections for connecting at least one electric energy store to be charged; a number n of at least three inverter bridges, each of which has a center tap; a number n of electric filters, wherein the input of each filter of the number n of filters is electrically connected to a respective corresponding center tap of an inverter bridge of the number of inverter bridges; a controllable assigning unit which is inserted between a respective output of a filter of the number n of filters and the number of connections and which is designed to electrically assign the output of each filter of the number n of filters to a respective corresponding connection of the number of connections depending on at least one actuation signal; and a control unit which is designed to generate the at least one actuation signal depending on a desired charge mode of the charging system.

A charging system has: a number of connections for connecting at least one electric energy store to be charged; a number n of at least three inverter bridges, each of which has a center tap; a number n of electric filters, wherein the input of each filter of the number n of filters is electrically connected to a respective corresponding center tap of an inverter bridge of the number of inverter bridges; a controllable assigning unit which is inserted between a respective output of a filter of the number n of filters and the number of connections and which is designed to electrically assign the output of each filter of the number n of filters to a respective corresponding connection of the number of connections depending on at least one actuation signal; and a control unit which is designed to generate the at least one actuation signal depending on a desired charge mode of the charging system.

An embodiment charging device includes a power factor correction circuit first to third switch legs connected to first to third inductors, respectively, a relay network for controlling connection between the first to third inductors and first to third input terminals according to a phase of a power grid connected to the first to third input terminals, a relay control circuit connected to the first to third input terminals for sensing one of the first to third input terminals to which a power source is connected and controlling the relay network based on a sensing result, and a relay filter circuit including first to third filter capacitors connected between a ground plane and first to third sensing lines connected to the relay control circuit for sensing voltages of the first to third input terminals and a fourth filter capacitor connected between the ground plane and a chassis.

An embodiment charging device includes a power factor correction circuit first to third switch legs connected to first to third inductors, respectively, a relay network for controlling connection between the first to third inductors and first to third input terminals according to a phase of a power grid connected to the first to third input terminals, a relay control circuit connected to the first to third input terminals for sensing one of the first to third input terminals to which a power source is connected and controlling the relay network based on a sensing result, and a relay filter circuit including first to third filter capacitors connected between a ground plane and first to third sensing lines connected to the relay control circuit for sensing voltages of the first to third input terminals and a fourth filter capacitor connected between the ground plane and a chassis.

An embodiment apparatus for an electric vehicle includes an indoor power outlet configured to receive power through one of a plurality of lines except for a single-phase alternating current (AC) charging line among three-phase AC input lines, a sensor configured to measure a required current of an electronic device connected to the indoor power outlet, and a controller configured to control a bidirectional on board charger of the electric vehicle based on the required current.

An embodiment apparatus for an electric vehicle includes an indoor power outlet configured to receive power through one of a plurality of lines except for a single-phase alternating current (AC) charging line among three-phase AC input lines, a sensor configured to measure a required current of an electronic device connected to the indoor power outlet, and a controller configured to control a bidirectional on board charger of the electric vehicle based on the required current.

A system for an AC to DC PFC converter includes a first phase switch group connected to a first node to receive power from a first phase of a voltage source; a second phase switch group connected to a second node to receive power from a second phase of the voltage source; a third phase switch group connected to a third node to receive power from a third phase of the voltage source; a neutral phase switch group connected to a fourth node to be connected to a ground terminal of the voltage source; a first switch connected to the first node and the second node; and a second switch connected to the second node and the third node.

A system for an AC to DC PFC converter includes a first phase switch group connected to a first node to receive power from a first phase of a voltage source; a second phase switch group connected to a second node to receive power from a second phase of the voltage source; a third phase switch group connected to a third node to receive power from a third phase of the voltage source; a neutral phase switch group connected to a fourth node to be connected to a ground terminal of the voltage source; a first switch connected to the first node and the second node; and a second switch connected to the second node and the third node.

A device and method are disclosed for regulated storage capacitor charging to high voltage. The device comprises an AC source configured to output an AC voltage, a voltage multiplier that constitutes a charging unit and a control unit. The control unit is configured to constantly sense the voltage on the storage capacitor and upon detecting that a predefined maximum charging voltage has been reached to react in at least one of the following ways: stop charging the storage capacitor, and closing an output switch so as to discharge of the storage capacitor through some load. The capacitance of each capacitor in the charging unit is substantially smaller than that of the storage capacitor so as achieve accurate maximum charging voltage as well as limited charging current.