The present document relates to a power converter configured to generate an output voltage at an output of the power converter. The power converter may comprise a power stage, a modulator circuit, ramp generator circuit, a first feedback circuit, and a second feedback circuit. The power stage may be coupled to the output of the power converter. The modulator circuit may comprise a first input and a second input, and an output of the modulator circuit may be coupled to the power stage. The ramp generator circuit may be configured to generate a ramp signal, and an output of the ramp generator circuit may be coupled to the first input of the modulator circuit. The first feedback loop may be coupled between the output of the power converter and the second input of the modulator circuit.

The present disclosure provides a control system of a buck converter, relating to the field of Internet of Things. The control system of a buck converter provided in an embodiment of the present disclosure includes a first control module, a second control module, and a mode selector. The first control module is turned on and the second control module is turned off through an analog current sensor in the mode selector when an IoT device switches from a transmission mode to a sleep mode or a standby mode, so that the first control module outputs a first voltage pulse to the driving and level shifter module, wherein a frequency of the first voltage pulse is determined by a frequency of a first clock in the first control module, and a width of the first voltage pulse is determined by a frequency of a second clock in the first control module.

Disclosed is an asymmetric half-bridge flyback converter and a control method, comprising: in an initial switching cycle of the asymmetric half-bridge flyback converter, obtaining a pre-turnoff time of the second switch transistor, and controlling the second switch transistor to be turned off after a delay which lasts for a first time and starts at the pre-turnoff time of the second switch transistor; in a non-initial switching cycle of the asymmetric half-bridge flyback converter, obtaining a judgment result by judging whether the first switch transistor is operated with zero-voltage switching in a current switching cycle, and adjusting a length of the first time based on the judgment result. The present disclosure can realize zero-voltage switching of the asymmetric half-bridge flyback converter, and at the same time, satisfy a requirement for achieving more ideal dead-time setting under a wider range of input voltage and a wider range of output voltage.

A circuit includes a current sensor circuit having inputs and an output. The current sensor inputs are adapted to be coupled to inductor terminals a power converter. The current sensor circuit includes a tunable time constant circuit coupled between the current sensor inputs and the current sensor output. A time constant control circuit is coupled to a tunable time constant circuit, and is configured to tune the time constant circuit responsive to the current sensor output and another signal representative of inductor current. An adjustable gain circuit has a first input coupled to the current sensor output. A direct current resistance (DCR) control circuit has an output coupled to a second input of the adjustable gain circuit, and the DCR control circuit is configured to provide a gain adjust signal at the output thereof responsive to an average current of the inductor and a current command signal for the power converter.

Various embodiments provide a parallel arrangement of discontinuous conduction mode (DCM) voltage regulators to provide a regulated voltage to a load. The individual DCM voltage regulators may be triggered (e.g., switched to a charge state) when the regulated voltage falls below a lower threshold. Different DCM voltage regulators in the parallel arrangement may have different lower thresholds. In some embodiments, different DCM voltage regulators may include different inductance and/or transistor size (e.g., to tune the DCM voltage regulators to different current handling capabilities). Other embodiments may be described and claimed.

In order to balance the thermal stress of the switches (S1-S4) of the two legs of an inverter full bridge (4), the driving signals are generated using an up-down counter having a modulation period T.sub.mod of twice the period T of the input voltage (Vin). The up-down counter has a first compare value (41) of D/4 and a second compare value (42) of (2+D)/4, where D is the duty cycle and where the second half bridge is phase shifted by the period T.

A control device for a power conversion apparatus and a resistor for a power conversion apparatus that can suppress a cross current between a plurality of power converters. A control device for a power conversion apparatus includes, in a state that AC sides of a plurality of power converters are connected in parallel without DC sides of the plurality of power converters being connected in parallel: a voltage recognition unit configured to recognize a voltage to ground on a DC side of a power converter, being an object to be controlled; and a controller configured to control, based on the voltage to ground on the DC side recognized by the voltage recognition unit, a DC voltage of the power converter, being the object to be controlled, such that the voltage to ground on the DC side of the power converter, being the object to be controlled, is further reduced.

Isolated buck converters can be an efficient solution in applications that deal with wide variations in input and/or output voltage. The double ended embodiments of such converters can also offer improved transformer utilization. Such converters can be operated in fixed frequency DCM mode operation or variable frequency boundary conduction mode (BCM). The buck/energy storage inductor may be placed in series with primary or secondary winding of the isolation transformer The inherent leakage inductance of the isolation transformer may also utilized as part of the buck inductance. If the leakage inductance of the isolation transformer is sufficiently high (such as in wireless power transfer applications), such converters can use the leakage inductance as the buck inductor.

According to an aspect, a power supply system includes a plurality of power converters configured to deliver a system load current to a load, where the system load current is a combination of individual load currents provided by the plurality of power converters, and a system performance controller configured to detect a value of the system load current. The system performance controller is configured to determine, using power loss information, values for the individual load currents such that a composite efficiency achieves a threshold condition. The system performance controller is configured to generate control signals to operate the plurality of power converters at the determined values.

A power supply circuit for a switching mode power supply, having: a charging capacitor coupled to an auxiliary winding; a power supply diode coupled to a power supply capacitor, wherein the charging capacitor has a connecting terminal coupled to the power supply diode, and the charging capacitor and the power supply diode are serially coupled between the auxiliary winding of the switching mode power supply and the power supply capacitor; and a power supply switch coupled between the connecting terminal and a primary ground of the switching mode power supply.