According to a non-isolated DCDC resonant conversion control circuit provided in embodiments of this application, an inductor and a capacitor that are resonant are connected in series, so that a current flowing through the inductor is a sine waveform. A waveform coefficient of the sine wave is small, and a conduction loss of the sine wave is low. Therefore, the circuit provided in embodiments of this application can significantly reduce a circuit loss. According to the non-isolated DCDC resonant conversion control method provided in embodiments of this application, not only a phase shift angle can be adjusted to enable a switching transistor to implement zero voltage switching (ZVS) on, but switching frequency can also be adjusted. Therefore, ranges in which a voltage and power of an output interface can be adjusted are large, so that non-isolated wide-range DCDC resonant conversion is implemented.

The resonant tank circuit (102) comprises: a transformer (T); a primary circuit (M1); and a secondary circuit (M2); wherein the transformer (T) and the primary and secondary circuits (M1, M2) are designed to operate in a forward mode and in a reverse mode; and wherein the transformer (T) and the primary and secondary circuits (M1, M2) have, at a resonant frequency (F.sub.R), a forward gain (G.sub.F(F.sub.R)), respectively a reverse gain (G.sub.R (F.sub.R)), essentially independent of the load, when operating in the forward mode, respectively the reverse mode. The primary and secondary circuits (M1, M2) are different one from another and the forward gain (G.sub.F(F.sub.R)) and the reverse gain (G.sub.R(F.sub.R)) at the resonant frequency (F.sub.R) are essentially equal to one another, notably to within 5%.

A compound control circuit comprises an input end, a light-load signal processing circuit, a slow response circuit and a fast response circuit. The compound control circuit is mainly used as an additional circuit of a work control chip, so that although the work control chip only has a single overcurrent protection level, a compound function control of fast and slow speed, high and low level current protection and light-load signal stabilization can be generated through the compound control circuit, so as to meet the complex application environment and compatible requirements of the current power supply.

An integrated circuit for a power supply including a power transistor, the integrated circuit being configured to switch and drive the power transistor. The integrated circuit includes: a first terminal to which a first switch is coupled; a first determination circuit configured to determine, based on a voltage level at the first terminal, whether to operate the integrated circuit in a first mode or a second mode, a power consumption in the second mode being greater than a power consumption in the first mode; a first power supply voltage generation circuit configured to stop generating a first power supply voltage when the integrated circuit operates in the first mode, and generate the first power supply voltage when the integrated circuit operates in the second mode; and a driver circuit configured to receive the first power supply voltage, to switch and drive the power transistor.

Various embodiments relate to a converter controller configured to control a resonant converter, including: an integrator configured to receive a current measurement signal from a current measurement circuit in the resonant converter and to produce a capacitor voltage signal indicative of the voltage at the resonant capacitor; a control logic configured to produce a high side driver signal, a low side driver signal, a symmetry error signal based upon the capacitor voltage signal and the current measurement signal; and a symmetry controller configured to produce a symmetry correction signal based upon the symmetry error signal, wherein the symmetry error signal is input into the integrator to control the duty cycle of the high side driver signal and the low side driver signal, wherein the high side driver signal and the low side driver signal control the operation of the resonant converter.

A direct-current voltage conversion circuit having on/off control with a dead-time period performed alternately on a first switch and a second switch included in a direct-current voltage conversion circuit. When alternating current flows in a series circuit part including two transformers magnetically independent, current flows in an output circuit including a secondary side of one transformer, and energy is accumulated in the other transformer. The permeabilities of the magnetic cores in the first and second transformers is between 15 and 120.

A bidirectional power converter includes a first switch circuit coupled to a second switch circuit via a transformer, wherein the first switch circuit is configured to transfer power to the second switch circuit during a charging mode, the second switch circuit is configured to transfer power to the first switch circuit during a discharging mode, and the first switch circuit is configured to operate in a half bridge configuration during a first portion of the charging mode.

Controllers for power converters, power converters and corresponding methods are provided.

A controller of a power converter including a first power stage and a second power stage receives an indication of an output voltage of the power converter, where the indication is measured at the primary side of the power converter. Based on the indication, a control related to an intermediate voltage of the power converter is performed.

In an example embodiment, a system includes an inverter configured to operate in at least one of a charging mode or a drive mode, a cascaded direct current (DC)-DC converter, the DC-DC converter including a first portion of the inverter and at least one controller configured to selectively couple the first portion of the inverter to a first portion of the cascaded DC-DC converter during the charging mode, and selectively couple the inverter to a second portion of the cascaded DC-DC converter during the drive mode.

A method for controlling an LLC resonance converter controls a converter through the steps of detecting parameter values related to operation of the converter, determining a switching duty of the converter on the basis of the detected parameter values, and controlling the converter with the determined switching duty to improve nonlinearity of a gain curve of the converter, thereby reducing output current ripples and achieving low-gain output.