Abstract:
Various improvements are provided to resonant DC/DC and AC/DC converter circuit. The improvements are of particular interest for LLC circuits. Some examples relate to self-oscillating circuit and others relate to converter circuits with frequency control, for example for power factor correction, driven by an oscillator.
Abstract:
A driver device (10) for driving a load (22), in particular for driving an LED unit comprising one or more LEDs is presented. The driver device comprises input terminals (12, 14) for connecting the driver device to an electrical power supply (16) for receiving a variable input voltage (V10) from the electrical power supply, a converter unit (25) for converting the input voltage (V10) to an output voltage (V12) including a resonant converter (40) and a switch unit (26), wherein the switch unit is adapted to provide a chopped voltage of the input voltage as a drive voltage (V16) to the resonant converter, and a control unit (34) connected to the switch unit for controlling a pulse frequency (fP) of the chopped voltage, wherein the control unit is adapted to control an input current (I10) drawn from the electrical power supply by controlling the pulse frequency of the chopped voltage on the basis of a measured value of the variable input voltage.
Abstract:
An integrated and isolated onboard charger for plug-in electric vehicles, includes an ac-dc converter and a dual-output dc-dc resonant converter, for both HV traction batteries and LV loads. In addition, the integrated and isolated onboard charger may be configured as unidirectional or bidirectional, and is capable of delivering power from HV traction batteries to the grid for vehicle-to-grid (V2G) applications. To increase the power density of the converter, the dual-output DC-DC resonant converter may combine magnetic components of resonant networks into a single three-winding electromagnetically integrated transformer (EMIT). The resonant converter may be configured as a half-bridge topology with split capacitors as the resonant network components to further reduce the size of converter. The integrated charger may be configured for various operating modes, including grid to vehicle (G2V), vehicle to grid (V2G) and high voltage to low voltage, HV-to-LV (H2L) charging.
Abstract:
A method of supplying electrical power to a load is provided. The method includes the step of providing a removable plug-in cartridge having markings related to a desired value of an electrical output of a power supply unit. The method further includes configuring the power supply unit to receive the removable plug-in cartridge such that the removable plug-in cartridge operates to set an output value of the power supply to the desired value.
Abstract:
Netzteil (1), insbesondere Weitbereichsnetzteil, mit einem Gleichrichter (2) zum Gleichrichten einer Wechselspannung (UE) in eine pulsierende Gleichspannung (U1), und mit einer Glättungsbaugruppe (3), die einen ersten Glättungskondensator (C1) umfasst, und die zum Wandeln der pulsierenden Gleichspannung (U1) in eine Gleichspannung geringerer Welligkeit (U2) vorgesehen ist, wobei die Glättungsbaugruppe (3) zudem einen zweiten Glättungskondensator (C2) umfasst, sowie eine elektrische Schaltbaugruppe (33), mit der der zweite Glättungskondensator (C2) dem ersten Glättungskondensator (C1) parallel schaltbar ist, wenn ein Betrag der pulsierenden Gleichspannung (U1) einen Schwellwert unterschreitet.
Abstract:
A power supply for controlling the supply of power from an AC power source to a load is disclosed. The power supply comprises: input terminals for connecting to an AC power source; at least one output terminal for connecting to a load; an inductor; a controllable switching device connected to the inductor and controllable to control current flow in the inductor so as to control the supply of power from a connected AC power source, via the inductor, to a connected load; and control means. The control means comprises a drive output terminal arranged to provide a drive signal to the switching device to control the switching device, the drive signal substantially comprising a square wave signal alternating between a first state and a second state. The control means further comprises an input terminal arranged to receive an input signal, and the control means is responsive to the input signal to switch the drive signal from the first state to the second state in response to the input signal falling below a threshold voltage and to inhibit switching of the drive signal from the first state to the second state if the input signal is above the threshold. The power supply is characterised in that the input signal is derived from the drive signal.
Abstract:
In at least one embodiment, an electronic system adapts current control timing for half line cycle of a phase-cut input voltage and responsively controls a dimmer current in a power converter system. The adaptive current control time and responsive current control provides, for example, interfacing with a dimmer. The electronic system and method include a dimmer, a switching power converter, and a controller to control the switching power converter and controls a dimmer current. In at least one embodiment, the controller determines a predicted time period from a zero crossing until a leading edge of a phase-cut input voltage and then responsively controls the dimmer current to, for example, reduce current and voltage perturbations (referred to as "ringing"), improve efficiency, and reduce an average amount of power handled by various circuit components.
Abstract:
The present application relates to switched mode power supplies and provides a method of control in which the constant current converter is controlled using estimates of output current from the secondary side determined from measurements performed on the primary side. The method of control operates during a current half mains cycle based on an average of the estimates of output current determined during a previous one or more half mains cycles. The method uses a measure of supply voltage to provide for power factor correction. A non linear function is employed to the measure to trade-off power factor correction with output ripple.