An apparatus includes a first power converter and a second power converter. The first power converter converts an input voltage into a first output voltage; the second power converter converts the first output voltage into a second output voltage that powers a load. The second power converter includes a switched-capacitor converter combined with a magnetic device. The switched-capacitor converter provides capacitive energy transfer; the magnetic device provides magnetic energy transfer. Additionally, the second power converter provides unregulated conversion of the first output voltage into the second output voltage via the capacitive energy transfer and the magnetic energy transfer. To maintain the magnitude of the second output voltage within a desired range or setpoint value, the first power converter regulates a magnitude of the first output voltage based on comparison of a magnitude of the second output voltage with respect to a desired setpoint reference voltage.

A switch control circuit and a switch control method are provided. The switch control circuit includes a load, an inductor, a control switch, and a sensing resistance connected in series to an input power; an integrator that integrates a sensing voltage and a load current setting voltage to generate an integrated signal; a comparator that compares the integrated signal and a bias voltage; a switch driver that controls the control switch based on an output of the comparator and an output of an off time controller; and a gate sensor that outputs, to the integrator, a gate sensing signal that senses a time when an input of a gate terminal of the control switch becomes a low level. An integration operation is started from a position in which the integrated signal is located lower than the bias voltage, when an input of the gate terminal becomes a high level.

System and method for charging or discharging one or more batteries. For example, a battery management system for charging or discharging one or more batteries includes: a first transistor including a first transistor terminal, a second transistor terminal, and a third transistor terminal, the second transistor terminal being configured to receive a first drive signal; a second transistor including a fourth transistor terminal, a fifth transistor terminal, and a sixth transistor terminal, the fifth transistor terminal being configured to receive a second drive signal; a burst mode detector configured to receive the first drive signal and generate a burst-mode detection signal based at least in part on the first drive signal; and a drive signal generator configured to receive the burst-mode detection signal and generate the first drive signal and the second drive signal based at least in part on the burst-mode detection signal.

An automatic dead zone time optimization system in a primary-side regulation flyback power supply continuous conduction mode (CCM), including a closed loop formed by a control system, including a single output digital to analog converter (DAC) midpoint sampling module, a digital control module, a current detection module, a dead zone time calculation module and a pulse-width modulation (PWM) driving module, and a controlled synchronous rectification primary-side regulation flyback converter. A primary-side current is sampled using a DAC Sampling mechanism to calculate a secondary-side average current, so as to obtain a primary-side average current and a secondary-side average current, in the case of CCM. A secondary-side current is input into the dead zone time calculation module to obtain a reasonable dead zone time; and the PWM driving module is jointly controlled by a primary-side regulation loop and the obtained dead zone time.

A DC-DC converter is disclosed having an electronic switch network having a supply node, a ground node, an output node, a first inductor node, a second inductor node, and switch control inputs. An inductor is coupled between the first inductor node and the second inductor node. Control logic circuitry has switch control outputs coupled to the switch control inputs, wherein the control logic circuitry is configured to cause the electronic switch network to couple the inductor between the supply node and the output node to provide current flow through the inductor for a fixed time period, and at the end of the fixed time period to measure a check time period until the current flow through the inductor is equal to predetermined current value, and based upon the measured check time period to determine to switch between buck operation and boost operation or boost operation and buck operation.

Adaptive enabling and disabling is described for valley switching in a power factor correction boost converter. In one example, a boost converter control system includes an amplitude detector to receive an amplitude signal from a boost converter that is related to ringing of the boost converter output. The amplitude detector determines the ringing amplitude. A valley switching controller compares the ringing amplitude to a first high amplitude threshold when valley switching is enabled and generates a valley switching disable signal if the ringing amplitude is below the first high amplitude threshold. A cycle controller coupled to the boost converter generates a drive signal to control switching of the boost converter and coupled to the valley switching controller receives the valley switching disable signal to generate the drive signal without valley switching in response to the valley switching disable signal.

A load control device for controlling power delivered from an alternating-current power source to an electrical load may comprise a controllably conductive device, a control circuit, and an overcurrent protection circuit that is configured to be disabled when the controllably conductive device is non-conductive. The control circuit may be configured to control the controllably conductive device to be non-conductive at the beginning of each half-cycle of the AC power source and to render the controllably conductive device conductive at a firing time during each half-cycle (e.g., using a forward phase-control dimming technique). The overcurrent protection circuit may be configured to render the controllably conductive device non-conductive in the event of an overcurrent condition in the controllably conductive device. The overcurrent protection circuit may be disabled when the controllably conductive device is non-conductive and enabled after the firing time when the controllably conductive device is rendered conductive during each half-cycle.

In an example, a system includes a differential amplifier having a first input terminal and a second input terminal, the differential amplifier configured to be coupled to a boost diode of a boost converter. The system also includes an input diode coupled to the first input terminal and the second input terminal. The system includes a pull-up circuit coupled to the input diode and configured to be coupled to the boost diode. The system also includes a pull-down circuit coupled to the pull-up circuit. The system includes a transistor coupled to the pull-up circuit and the pull-down circuit.

Systems, methods and apparatus for wireless charging are disclosed. A charging device has a resonant circuit that includes a transmitting coil. The charging device also has a driver circuit configured to power the resonant circuit, a pulse width modulator and a controller configured to provide a control signal to the pulse width modulator the control signal configuring the pulse width to provide a modulated drive signal to the driver circuit. The pulse width modulator is configured to provide the modulated drive signal to the resonant circuit. The resonant circuit is configured to operate as a low-pass filter that blocks frequency components of the modulated drive signal that correspond to the reference signal. The driver circuit is configured to use the modulated drive signal to produce a charging current in the resonant circuit. The charging current causes power to be wirelessly transferred to a receiving device through the transmitting coil.

A system for driving four-quadrant (4Q) switches of a power converter is provided herein and comprises a transformer driver module, a first gate driver module and a second gate driver module coupled to the transformer driver module via a first isolation transformer and a second isolation transformer, respectively, for receiving both switch signal information and power, and a first bidirectional switch and a second bidirectional switch coupled to the first gate driver module and the second gate driver module and to one another for driving the first bidirectional switch and the second bidirectional switch based on the switch signal information.