This application discloses a photovoltaic system. The photovoltaic system includes a DC/DC converter, a resonant switched capacitor converter, an inverter, and a controller. An input terminal of the DC/DC converter is connected to a photovoltaic array. A first input terminal of the resonant switched capacitor converter is connected to a positive output terminal of the DC/DC converter, and a second input terminal of the resonant switched capacitor converter is connected to a negative output terminal of the DC/DC converter. A first output terminal of the resonant switched capacitor converter is connected to a neutral wire of the inverter, a second output terminal of the resonant switched capacitor converter is connected to a negative bus of the inverter, and the resonant switched capacitor converter includes at least the following two resonant switched capacitor circuits RSCCs connected in parallel: a first RSCC and a second RSCC.

An overcurrent detection circuit including a detection unit for detecting whether a current flowing between main terminals of a main switching device used by a power conversion device is an overcurrent, and a switching unit for switching among thresholds used for determining the overcurrent in the detection unit according to in which phase of the power conversion device the main switching device is used, in which the detection unit includes a plurality of comparison units for comparing a parameter according to the current flowing between main terminals, and thresholds different from each other, and the switching unit is for switching a comparison unit to use for detection of the overcurrent among the plurality of comparison units.

A period from when switching elements S1, S4 at first diagonal positions in a full-bridge inverter are turned off at the same time to when switching elements S2, S3 at second diagonal positions are turned on at the same time, is defined as T1, and a period from when the switching elements S2, S3 at the second diagonal positions are turned off at the same time to when the switching elements S1, S4 at the first diagonal positions are turned on at the same time, is defined as T2. With a total length of T1 and T2 set to be constant, the lengths of T1 and T2 are controlled to be changed every switching cycle.

A power conversion system includes a power conversion apparatus and a programming support apparatus connected to the power conversion apparatus. The power conversion apparatus includes power conversion circuitry, program storage that stores a control program configured to control the power conversion circuitry, and a control unit that controls the power conversion circuitry according to a control program. The programming support apparatus includes a display data generation unit that generates display data of a block diagram illustrating a content of the control program using a plurality of functional blocks, and a link indicating input and output of information between the functional blocks based on the control program stored in the program storage.

A power conversion system includes a power conversion apparatus and a programming support apparatus connected to the power conversion apparatus. The power conversion apparatus includes power conversion circuitry, program storage that stores a control program configured to control the power conversion circuitry, and a control unit that controls the power conversion circuitry according to a control program. The programming support apparatus includes a display data generation unit that generates display data of a block diagram illustrating a content of the control program using a plurality of functional blocks, and a link indicating input and output of information between the functional blocks based on the control program stored in the program storage.

A charging integrated circuit (IC) includes a bidirectional switching converter and a controller. The bidirectional switching converter is configured to generate a first output voltage by bucking a first input voltage based on a first switching operation in a buck mode, generate a second output voltage by boosting a second input voltage based on a second switching operation in a boost mode, and generate the first output voltage or the second output voltage based on a third switching operation in a buck-boost mode. The controller is configured to control the second switching operation according to a valley current mode control (VCMC) in a continuous current section and control the second switching operation according to a voltage mode control (VMC) based on a fixed switching frequency in a discontinuous current section, in the boost mode.

An inverter. The inverter includes a first and second transistors, which are a high-side transistor and a low-side transistor of the inverter, and control electronics configured to trigger a first switching operation, in which the first transistor is switched on, wherein the second transistor is in a switched-off state, wherein a parasitic capacitance of the first transistor is discharged during the first switching operation, to trigger a second switching operation, in which the first transistor is switched off or switched on again, wherein the second transistor simultaneously remains in the switched-off state, wherein the parasitic capacitance of the first transistor is already discharged in the second switching operation, to record a time difference which describes a difference between a duration of the first switching operation and a duration of the second switching operation, and to determine a characteristic operating parameter of the first transistor based on the time difference.

A secondary side controller for a flyback converter includes an integrated circuit (IC), which in turn includes: a synchronous rectifier (SR) sense pin coupled to a drain of an SR transistor on a secondary side of the flyback converter; a capacitor having a first side coupled to the SR sense pin, the capacitor to charge or discharge responsive to a voltage sensed at the SR sense pin; a diode-connected transistor coupled between a second side of the capacitor and ground; a first current mirror coupled to the diode-connected transistor and configured to receive, as input current, a reference current from a variable current source; and a peak detect transistor coupled to the diode-connected transistor and to an output of the first current mirror. The peak detect transistor is to output a peak detection signal in response to detecting current from the capacitor drop below the reference current.

A device includes a switch network having a plurality of power switches and coupled to a dc rail with a dc voltage, and a resonant tank coupled to the switch network. The resonant tank has a first coil and a resonant capacitor. Gate drive signals of a group of power switches of the plurality of power switches in the switch network are configured to be turned on with a phase shift against a zero crossing of a current in the resonant tank, and the phase shift is configured to adjust the dc voltage or establish a soft-switching condition for the plurality of power switches in an operation mode.

A switching regulator, system-on-chip including the switching regulator, and operating method of the switching regulator are provided. The switching regulator comprises a first inductor having a first end connected to a first node and a second end connected to an output terminal, a second inductor having a first end connected to a second node and a second end connected to the output terminal, a flying capacitor having a first end connected to the first node and a second end connected to the second node, and control circuitry configured to at each of first through fourth times control the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, and the eighth switch to cause the flying capacitor to store a voltage corresponding to a difference between currents flowing in the first inductor and the second inductor.