A switching regulator generates an output voltage from an input voltage and includes; a charge sharing circuit that selectively forms one of a first charge sharing path between a first flying capacitor and a second bootstrap capacitor and a second charge sharing path between a second flying capacitor and a first bootstrap capacitor based on first and second conversion modes.

A switching regulator generates an output voltage from an input voltage and includes; a charge sharing circuit that selectively forms one of a first charge sharing path between a first flying capacitor and a second bootstrap capacitor and a second charge sharing path between a second flying capacitor and a first bootstrap capacitor based on first and second conversion modes.

A DC/DC converter includes a semiconductor switch S1 and is configured to convert an input voltage by turning on and off the semiconductor switch S1. A semiconductor switch S2 is connected between a main power supply and input of the DC/DC converter. A semiconductor switch S3 is connected between a connection point between the semiconductor switch S2 and the input of the DC/DC converter and the backup power supply. A control unit turns on the semiconductor switch S2 and the semiconductor switch S3 in a normal state, and turns off the semiconductor switch S2 and turns on the semiconductor switch S3 when an abnormality occurs in the main power supply.

A DC/DC converter includes a semiconductor switch S1 and is configured to convert an input voltage by turning on and off the semiconductor switch S1. A semiconductor switch S2 is connected between a main power supply and input of the DC/DC converter. A semiconductor switch S3 is connected between a connection point between the semiconductor switch S2 and the input of the DC/DC converter and the backup power supply. A control unit turns on the semiconductor switch S2 and the semiconductor switch S3 in a normal state, and turns off the semiconductor switch S2 and turns on the semiconductor switch S3 when an abnormality occurs in the main power supply.

Provided is a switching circuit including an input terminal, a switching terminal, a ground terminal, a bootstrap terminal, a high side transistor connected to the input terminal and the switching terminal, a low side transistor connected to the switching terminal and the ground terminal, a bootstrap capacitor connected to the switching terminal and the bootstrap terminal, a bootstrap switch including a PMOS transistor, and a driver circuit that turns on the bootstrap switch in a period in which the low side transistor is on and that turns off the bootstrap switch in a period in which the low side transistor is off, in which the driver circuit includes a level shifter and a buffer, and the level shifter includes an output line, a first resistance, a first transistor, a second resistance, a third resistance, a second transistor, a third transistor, a first capacitor, and a fourth transistor.

Provided is a switching circuit including an input terminal, a switching terminal, a ground terminal, a bootstrap terminal, a high side transistor connected to the input terminal and the switching terminal, a low side transistor connected to the switching terminal and the ground terminal, a bootstrap capacitor connected to the switching terminal and the bootstrap terminal, a bootstrap switch including a PMOS transistor, and a driver circuit that turns on the bootstrap switch in a period in which the low side transistor is on and that turns off the bootstrap switch in a period in which the low side transistor is off, in which the driver circuit includes a level shifter and a buffer, and the level shifter includes an output line, a first resistance, a first transistor, a second resistance, a third resistance, a second transistor, a third transistor, a first capacitor, and a fourth transistor.

Transient or fault conditions for a switched capacitor power converter are detected by measuring one or more of internal voltages and/or currents associated with switching elements (e.g., transistors) or phase nodes, or voltages or currents at terminals of the converter, and based on these measurements detect that a condition has occurred when the measurements deviate from a predetermined range. Upon detection of the condition fault control circuitry alters operation of the converter, for example, by using a high voltage switch to electrically disconnect at least some of the switching elements from one or more terminals of the converter, or by altering timing characteristics of the phase signals.

In this DC/DC converter, a first switching circuit is connected between a first winding of a transformer and a DC power supply, and a second switching circuit is connected between a second winding and a battery. A control circuit includes a first circuit for performing feedback control so as to reduce a difference between a detected value and a command value of charge current, and a second circuit for correcting one of control input and output of the first circuit on the basis of the detected value and the command value. In charging the battery, the control circuit controls a phase shift amount of a first diagonal element in the first switching circuit and a phase shift amount of a second diagonal element in the second switching circuit relative to the drive phase of a first reference element in the first switching circuit.

In this DC/DC converter, a first switching circuit is connected between a first winding of a transformer and a DC power supply, and a second switching circuit is connected between a second winding and a battery. A control circuit includes a first circuit for performing feedback control so as to reduce a difference between a detected value and a command value of charge current, and a second circuit for correcting one of control input and output of the first circuit on the basis of the detected value and the command value. In charging the battery, the control circuit controls a phase shift amount of a first diagonal element in the first switching circuit and a phase shift amount of a second diagonal element in the second switching circuit relative to the drive phase of a first reference element in the first switching circuit.

A power factor correction circuit includes: a coil and MOSFETs that boost an input voltage to generate a boosted voltage; a first capacitor having one end connected to a first output terminal, and the other end connected to an intermediate node; and a second capacitor having one end connected to the intermediate node, and the other end connected to a second output terminal. In a first operation mode, the boosted vol tage is applied to the two ends of the first capacitor when a positive voltage is input, and applied to the two ends of the second capacitor when a negative voltage is input. In a second operation mode, the boosted voltage is applied to two ends of the first and second capacitors connected in series. Thus, there is provided a power factor correction circuit which has a high efficiency and is compatible with an input voltage in a broad range.