A power converter circuit (300) comprising: a full bridge inverter and an resonance circuit and a control circuit. The full bridge comprises a first leg (HBx) and a second leg (HBy), each leg having two switches and a switching node between the switches, the switches of the first leg being different from those of the second leg. The resonance circuit is connected between said switching nodes, and comprises an inductance (Lp) in series 5 with a capacitance (Cr). The control circuit generates control signals for the switches in accordance with a predefined scheme having two energizing phases (φ1, φ3) and two passive conducting phases (φ2, φ4) with a configurable duty cycle (DC1, DC2) for achieving zero-voltage-switching (ZVS).

An inductive current sensor is used for a constant peak current circuit of a DC-DC conversion apparatus and has a sampling unit, a voltage-voltage conversion unit and an input voltage compensation unit. The sampling unit is used to receive a feedback voltage and an input voltage and generate a sampling voltage proportional to the feedback voltage accordingly, and the feedback voltage is related and inversely proportional to an inductor current by the DC-DC conversion apparatus. The voltage-voltage conversion unit is electrically connected to the sampling unit to receive the sampling voltage and the input voltage, and generate a sensing voltage inversely proportional to the sampling voltage accordingly. The input voltage compensation unit is electrically connected to the voltage-voltage conversion unit for receiving the input voltage to provide an initial voltage level of the sensing voltage, and the initial voltage level is proportional to the input voltage.

A circuit includes a signal modification circuit, a power stage circuit, and a boost converter circuit. The signal modification circuit generates a modified signal according to an input signal. The power stage circuit is electrically coupled to the signal modification circuit and receives a first voltage to amplify the modified signal and generate an output signal. The boost converter circuit selectively controls the amplitude of the first voltage. The signal modification circuit electrically coupled to the boost converter circuit. Therefore, the signal modification circuit is configured to dynamically adjust its own gain corresponding to the value of the first voltage, and the input signal is modified into the modified signal based on the gain of the signal modification circuit.

A wireless power transmitter includes: a switching unit configured to receive a direct current (DC) voltage and to perform switching to output a first alternating current (AC) voltage; a piezoelectric transformer configured to receive the first AC voltage through a first piezoelectric element, and to output a second AC voltage corresponding to mechanical vibration of a second piezoelectric element caused by mechanical vibration of the first piezoelectric element; and a resonator configured to receive the second AC voltage to wirelessly transmit power.

A first filter outputs a first signal in response to receiving an input signal. The first signal has a first state in response to the input signal reaching a first threshold voltage on a leading edge of the input signal, and a second state in response to the input signal reaching the first threshold voltage on a trailing edge of the input signal. A second filter outputs a second signal in response to receiving the input signal. The second signal has the first state in response to the input signal reaching a second threshold voltage on the leading edge of the input signal, and the second state in response to the input signal reaching the second threshold voltage on the trailing edge of the input signal. A detection circuit determines, based on times when the first and second thresholds are reached, whether the input signal is received from a triac.

According to an embodiment, a circuit includes a protection voltage generator coupled to a first voltage node, a second voltage node, and a ground voltage node, the protection voltage generator configured to generate a plurality of protection voltages at a first plurality of nodes based on the first voltage node and the second voltage node, and a voltage protection ladder coupled between the first voltage node and a low voltage circuit, the voltage protection ladder coupled to the plurality of protection voltages at the first plurality of nodes, the voltage protection ladder configured to generate a first low voltage based on the first voltage node and the plurality of protection voltages.

Provided is a buck converter. The converter includes a power switch configured to receive and switch an input voltage and convert the input voltage into an output voltage, and a switch control circuit configured to generate a signal having a frequency synchronized with the input voltage, compensate for the signal by using an edge threshold voltage in an edge area of the signal according to at least one of a load state and the input voltage, and control switching of the power switch by using a result of comparing the signal with a band voltage corresponding to the output.

A switching regulator includes a high side transistor coupled to an input voltage node. The switching regulator also includes a low side transistor coupled to the high side transistor at a switch node. An adaptive on-time control circuit is also included and is configured to cause the high side transistor to turn on for an adaptive period of time based on a ratio of an output voltage from the switching regulator to input voltage. The adaptive period of time is configured to occur responsive to a current through an inductor falling below a predetermined threshold.

An apparatus includes a controller that monitors an error voltage indicating a difference between an output voltage and a setpoint voltage. Based on the monitored error voltage, the controller generates modulation adjustment signals including a frequency adjustment signal and an ON-time adjustment signal. The controller modulates a pulse width modulation signal of a first power supply phase in accordance with both the frequency modulation adjustment signal and the ON-time adjustment signal.

A control IC includes a VS voltage detection circuit that indirectly detects input voltage, by utilizing a fact that a voltage of a VS terminal of a reference potential of a high side drive circuit changes to a voltage equivalent to the input voltage when a high side drive signal is output from a control circuit to cause the high side drive circuit to turn on a high side switching element. The VS voltage detection circuit determines the level of the input voltage by sampling the VS terminal voltage at a time point that is delayed by a predetermined time from a rising edge of the high side drive signal, and supplies the determined level to the control circuit.