A power factor correction circuit for a boost power supply, wherein the boost power supply includes a boost converter responsive to a rectified AC line voltage. According to one embodiment, the power factor correction circuit includes a voltage feedback amplifier having a first input terminal responsive to an output voltage of the boost converter, a switching multiplier circuit having a first input terminal connected to an output terminal of the voltage feedback amplifier and a second input terminal responsive to the rectified AC line voltage, a current feedback amplifier having a first input terminal connected to an output terminal of the switching multiplier circuit and having a second input terminal responsive to an input current of the boost converter, and a pulse width modulator control circuit having an input terminal connected to an output terminal of the current feedback amplifier and having an output terminal for connection to a pulse width modulated switch of the boost converter.
Synchronous Rectified Switch With Auto Fault Clearing
A fault tolerant synchronous rectifier regulator system and method are disclosed. In the system and method, a high side switch is operable to be coupled to an electrical bus, and a low side switch is coupled to a common ground. In addition, a first fuse is coupled to the high side switch and the low side switch, and operable to open in response to a first fault. Furthermore, a second fuse is coupled to the high side switch and the first fuse, and operable to be coupled to a current source and to open in response to a second fault.
Synchronous Rectified Pwm Regulator With Auto Fault Clearing
A fault tolerant synchronous rectifier PWM regulator system and method are disclosed. In the system and method, a force commutated synchronous rectifier is operable to be coupled to an electrical bus, and a low side switch is operable to be coupled to a common ground. In addition, a first fuse is coupled to the force commutated synchronous rectifier and the low side switch, and is operable to open in response to a first fault. Furthermore, an inductor is coupled to the first fuse, the force commutated synchronous rectifier and the low side switch, and a second fuse is coupled to the inductor and is operable to be coupled to a current source and to open in response to a second fault.
Sequential Shunt Regulator With Analog Fill Control
A sequential shunt regulator switch system and method is disclosed. A power switch is controlled to switch a first current from a power source to an electrical bus. Further, a current controllable switch provides a controlled current from the power source to the electrical bus.
A system and methods for cell telemetry are disclosed. An average magnetizing current in a sampling transformer is forced to about zero amperes by balancing volt-seconds using a voltage clamp mechanism. Furthermore, a pulse driven switch and a synchronized sampling switch are activated, and substantially simultaneously the voltage clamp mechanism deactivated.
A method for cell voltage balancing is disclosed. A plurality of cells is coupled to a plurality of cell interface circuits, and the cell interface circuits are driven with a balancing transformer such that a balancing current flows between the cell interface circuits. Control gates of the cell interface circuits are driven with a gate drive transformer such that two adjacent circuits of the cell interface circuits are activated with opposite phase.
A system and method for bi-directional voltage conversion are disclosed. A charge current is received at a first voltage on a first force commutated synchronous rectifier, and the charge current is controlled by the first force commutated synchronous rectifier. An inductor is charged by the charge current, and a discharge current from the inductor is controlled by the second force commutated synchronous rectifier.
Synchronous Rectifier Bi-Directional Current Sensor
A method and apparatus for bi-directional current sensing for a synchronous rectifier bi-directional converter system is disclosed. A first current is measured through a first synchronous rectifier via a first transformer to provide a first signal. A second current is measured through a second force synchronous rectifier via a second transformer to provide a second signal. The first signal and the second signal are DC restored to provide a first DC restored signal and a second DC restored signal respectively. A first correction current is added to the first DC restored signal to produce a first corrected signal, and a second correction current is added to the second DC restored signal to produce a second corrected signal. The first corrected signal and the second corrected signal are added to produce a combined signal.