A first controller for a power converter, the first controller comprising a driver, supply terminal, branch switch and branch control. The driver configured to provide a drive signal to turn ON and turn OFF a power switch. The power switch includes a first switch and a second switch coupled in a cascode configuration. The supply terminal coupled to a bypass capacitor that provides operating power to the first controller, wherein the bypass capacitor has a bypass voltage. The branch switch coupled to a node between the first switch and the second switch. The branch control configured to receive a regulation signal representative of a comparison of the bypass voltage to a bypass reference and is configured to turn ON the branch switch if the bypass voltage is below the bypass reference to redirect at least a portion of a drain current of the power switch to the bypass capacitor.

A dual-input power supply has two power paths that connect a server to electrical Each power path has a first stage that comprises a power-factor correction circuit. The power paths share a common second stage that comprises a dc/dc converter. The first stages of the power paths collectively defining a pair of first stages that is disposed either within a package that is off the motherboard or without a package and on the motherboard. Similarly, the second stage is disposed either within a package that is off the motherboard or without a package and on the motherboard.

An electrical network including a power source, a flyback converter, a microcontroller, a PID controller, a voltage boost converter, a pulse width modulator integrated circuit, and a battery. The power source produces a charge with a voltage ranging from about 0.1V to about 0.8V and a power ranging from about 0.3 mW to about 100 mW. The flyback converter functions in discontinuous current mode. The microcontroller monitors the power source voltage, calculates a voltage response, and outputs a control signal for the voltage. The PID controller is a digital PID controller, an analog PID controller, or a combination thereof. The voltage boost converter utilizes the power source voltage and power to provide higher voltage power to the electrical network. The pulse width modulator integrated circuit sets a duty cycle and frequency for the flyback converter. The battery stores excess charge produced by the power source.

A control circuit includes: an output terminal configured to be coupled to a control terminal of a transistor that has a current path coupled to an inductor; a transconductance amplifier configured to produce a sense current based on a current flowing through the current path of the transistor; and a first capacitor, where the control circuit is configured to: turn on the transistor based on a clock signal, integrate the sense current with an integrating capacitor to generate a first voltage, generate a second voltage across the first capacitor based on a first current, generate a second current based on the second voltage, generate a third voltage based on the second current, turn off the transistor when the first voltage becomes higher than the third voltage; discharge the integrating capacitor when the transistor turns off; and regulate an average output current flowing through the inductor based on the first current.

A driver circuit is configured to control a power transistor. The driver circuit comprises a signal generator configured to generate a control signal for the power transistor based on a supply signal and an input signal from a control unit. In addition, the driver circuit includes a ripple detector configured to receive the supply signal and determine whether the supply signal includes a ripple error. In some examples, the ripple detector may be configured to send a warning signal to the control unit in response to detecting the ripple error.

A conversion circuit and an adapter that resolve a voltage drop problem of a power supply of a driver in an ACF circuit. The conversion circuit includes an active clamp flyback circuit, a drive circuit, and a replenishment power transistor. The active clamp flyback circuit is configured to perform power conversion. The drive circuit is configured to output a drive signal and a reference voltage. The drive signal is used to drive the active clamp flyback circuit. A first terminal of the replenishment power transistor is coupled to an input terminal of the active clamp flyback circuit, a second terminal of the replenishment power transistor is coupled to a power supply terminal of the drive circuit, and a gate of the replenishment power transistor is configured to receive the reference voltage.

A method for controlling an LLC resonance converter controls a converter through the steps of detecting parameter values related to operation of the converter, determining a switching duty of the converter on the basis of the detected parameter values, and controlling the converter with the determined switching duty to improve nonlinearity of a gain curve of the converter, thereby reducing output current ripples and achieving low-gain output.

A power supply comprises a transformer having a primary winding and a secondary winding, a bridge circuit coupled to the primary winding of the transformer, a first rail coupled to the secondary winding of the transformer, and a second rail coupled to the secondary winding of the transformer. The bridge circuit comprises a plurality of switches. The power supply also comprises a first sensor assembly coupled to generate a first error signal representing a difference between currents in the first rail and the second rail. A controller is configured to alter a duty cycle of a first switch of the plurality of switches relative to a duty cycle of a second switch of the plurality of switches based on the first error signal.

An integrated circuit for a power supply circuit including a transformer having a primary coil, a secondary coil, and an auxiliary coil, and a transistor configured to control a current flowing through the primary coil. The integrated circuit includes a first terminal receiving a power supply voltage corresponding to a voltage from the auxiliary coil; a second terminal receiving a feedback voltage corresponding to an output voltage; a third terminal receiving a voltage corresponding to a current flowing through the transistor when the transistor is on; a determination circuit determining whether a detection circuit configured to detect a voltage generated in the auxiliary coil is coupled between the third terminal and the auxiliary coil; and a switching control circuit controlling switching of the transistor based on the voltages at the second and third terminals and a determination result of the first determination circuit.

A method includes converting an electrical output provided by an energy generator with a first voltage converter; and, subsequent to converting the electrical output provided by the energy generator with the first voltage converter, activating, with a microprocessor, a second voltage converter for converting the electrical output provided by the energy generator with the second voltage converter. An electrical device with a microprocessor for selecting one of two or more voltage converters is also described.