A spread spectrum switching converter converts an input power to an output power. The spread spectrum switching converter includes a pulse width modulation (PWM) circuit and a pulse omission control circuit. The PWM circuit generate an initial PWM signal according to a feedback signal related to the output power. The initial PWM signal controls at least one switch to switch an inductor to generate the output power. The pulse omission control circuit generates a pulse omission control signal to mask a portion of pulses of the initial PWM signal, to thereby generate an adjusted PWM signal. The pulse omission control circuit randomly adjusts the pulse width of the pulse omission control signal according to a random control signal, such that the adjusted PWM signal has a spread spectrum characteristic.

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.

Embodiments of the present disclosure provide a power supply system. The power supply system comprises a first loop and a second loop. The first loop includes a DC-DC conversion module connected in parallel to a first load, and each first terminal of the DC-DC conversion module and the first load that are connected in parallel is grounded. The second loop includes a storage battery connected in parallel to a second load, and each first terminal of the storage battery and the second load that are connected in parallel is grounded. The power supply system further includes a switch unit. The switch unit includes a switch. The switch is coupled in series between a second terminal of each of the DC-DC conversion module and the first load that are connected in parallel and a second terminal of each of the storage battery and the second load that are connected in parallel. The switch is in an on-state by default, so that a vehicle is started by using the storage battery in the second loop.

A bridge circuit includes a first leg and a second leg arranged in parallel between the first node and the third node. A clamp circuit includes a third leg including a first bidirectional switch disposed between a fourth node that is a midpoint of the first leg and a fifth node that is a midpoint of the second leg. A first reactor is connected with the fourth node and a sixth node, and a second reactor is connected with a fifth node and a seventh node. A fourth leg includes a second bidirectional switch disposed between the second node and the fourth node or the fifth node.

A power supply control device controls power supply to a load through a power supply switch. A driving circuit switches on or off the power supply switch. When the driving circuit switches the power supply switch from off to on, a waveform value regarding the current waveform of a current that flows through the load is output by a waveform value detection unit to a microcomputer. The microcomputer determines power supply control conditions regarding control of power supply to the load based on the waveform value that is input from the waveform detection unit.

A power converter system is described. The power converter system includes a power converter comprising at least one converter unit, each converter unit comprising a plurality of semiconductor devices, each semiconductor device including at least a controllable semiconductor switch. A local controller is associated with at least one converter unit and adapted to receive CD and MD from a main controller. In response to a detected fault condition of the power converter system, the local controller is adapted to use at least one of the one or more locally-stored values to determine an operating state of the power converter system, and to use the determined operating state to select a fault operating procedure to control each associated converter unit according to the selected fault operating procedure without using any CD from the main controller.

A multi-converter power supply system includes a plurality of cell converters, a common node to which an individual output terminal of each of the plurality of cell converters is connected, a current waveform signal generation circuit that generates a current waveform signal corresponding to a current waveform flowing through an individual inductor, and a first instrumentation amplifier that receives input of an individual output voltage signal obtained from the individual output terminal and the current waveform signal and that outputs a signal for comparison with a current common signal shared by a plurality of switching control circuits. The current waveform signal and the individual output voltage signal that are input to the first instrumentation amplifier are formed with reference to a potential of the common node.

A power supply used to convert an input voltage into an output voltage, and the power supply includes an input detection circuit, a conversion circuit, a detection circuit, and a controller. The input detection circuit provides a power good signal or a power fail signal according to the input voltage. The conversion circuit converts the input voltage into an output voltage, and the detection circuit detects the output voltage according to the power good signal to accordingly provide an output feedback signal with a first feedback value. The controller stabilizes a voltage level of the output voltage according to the first feedback value. The detection circuit self-adjusts a feedback condition according to the power fail signal, and correspondingly adjusts the output feedback signal to a second feedback value according to the feedback condition. The controller reduces the voltage level of the output voltage according to the second feedback value.

A system includes a solid-state circuit breaker coupling between a power supply and an electrical load. The system also includes a gateway interface device communicatively coupled to the solid-state circuit breaker and includes a plurality of communication interfaces. In an embodiment, the gateway interface device includes a controller configured to perform operations including determining a connection status of at least one communication interface of the plurality of communication interfaces and determining a number of devices connected to the at least one communication interface, receive a signal from at least one device of the number of devices. In the embodiment, the operations may also include in response to receiving the signal, instructing the solid-state circuit breaker to disconnect the electrical load from the power supply.

The present invention discloses a method of standby power supply including steps of: detecting a loading level; determining the loading level; entering a select mode; selecting a standby mode; entering a no-load mode, or a sleep mode, or a power-down mode; during the no-load mode, generating a no-load sustaining power, and returning back to detect the loading level when a preset condition is met; during the sleep mode, generating a sleep sustaining power, and returning back to detect the loading level when the preset condition is met; during the power-down mode, ceasing the power and entering a power-down recovery mode; and during the power-down recovery mode, returning back to detect the loading level when the preset condition is met. Therefore, the present invention implements power conversion for normal power supply, and particularly effectively controls the amount of power in the standby state, thereby greatly reducing power consumption and improving power saving.