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.

An integrated single stage ac-dc driver for powering LED loads includes a boost converter operating in a Discontinuous Conduction Mode, DCM, comprising a half-bridge, and a Zeta Asymmetrical Half Bridge, ZAHB, integrated with the boost converter such that the boost converter and the ZAHB share the half-bridge to perform power factor control, PFC, with a fixed duty cycle and control an output voltage.

An inverter circuit receives an AC input signal and uses at least two bidirectional switches between the input terminals and a junction node to perform the electrical inversion function. A resonant circuit is formed by a primary side inductor between the junction node and a second node and a capacitor arrangement between the second node and the input terminals.

A conversion apparatus with overload control includes a primary conversion circuit, a resonant conversion circuit, and a control unit. The control unit controls a voltage value of a DC power source outputted from the primary conversion circuit according to a current signal of an output current of the resonant conversion circuit. When the control unit realizes that the output current exceeds a rated current according to the current signal, the control unit steps up the voltage value of the DC power source.

An LLC resonant converter comprises, an LLC resonant converter circuit with an output line and an input line. The LLC resonant converter circuit includes a switch array operatively connecting between the input line and the output line. A controller is connected to the input line by a feed forward line and connected to a respective gate of each switch in the switch array. The controller includes machine readable instructions configured to cause the controller to receive feed forward input from the input line and control switching of the switch array with a pulse frequency modulation (PFM) switching pattern to regulate voltage of the output line.

A synchronous average harmonic current controller for a line connected bidirectional resonant power converter results in a harmonic voltage gain closely related to the commanded bridge duty cycles. A primary bridge has its duty cycle set to achieve controlled line power transfer and voltage regulation of a primary bus energy storage capacitor. A secondary bridge circuit has its duty cycle set to achieve voltage regulation of secondary bus energy storage capacitor. A first embodiment uses the independent energy storage elements to achieve power factor correction and low noise regulation using a single stage. A second embodiment uses feedforward duty cycle control to achieve isolated voltage regulation using the well-defined voltage gain resulting from the synchronous average harmonic current controller.

A method for controlling the input voltage frequency of a DC-DC converter includes calculating a control frequency value of the DC-DC converter. If the measured voltage is greater than the upper voltage limit, the control frequency corresponds to the minimum control frequency. If the measured voltage is less than the lower voltage limit, the control frequency corresponds to the maximum control frequency. If the measured voltage is between the upper voltage limit and the lower voltage limit, the control frequency corresponds to an average frequency calculated as a function of the difference between the setpoint voltage value and the measured voltage, upper error values and lower error values, and maximum and minimum control frequency values.

A power converter includes a first circuit including an inductor and configured to convert an input voltage into a first voltage, a second circuit including a transformer and configured to convert the first voltage input to the insulating transformer to a second voltage, a control circuit configured to control the first circuit, a first power supply circuit including a first winding magnetically coupled to the inductor and configured to output a third voltage generated by the first winding to the first control circuit, and a second power supply circuit including a second winding magnetically coupled to the transformer and configured to output a fourth voltage generated by the second winding to the first control circuit. When the second voltage is not output the third voltage is output to the control circuit, and when the second voltage is output the fourth voltage is output to the control circuit.

A switching power circuit for charging a battery can include: four switches extending between two ports of a low-frequency AC input voltage and an energy storage circuit, where the energy storage circuit and a primary winding of a transformer are coupled between first and second nodes, the first node is a common node of the first and second switches, and the second node is a common node of the third and fourth switches; a rectification circuit having an input terminal coupled to a secondary winding of the transformer; a DC-DC converter having an input terminal coupled to an output terminal of the rectification circuit, and generates a charging current; and a control circuit that adjusts the charging current by controlling an operation of the DC-DC converter according to a charging requirement, in order to make an average value of the charging current meet the charging requirement.

Disclosed is a converter circuit having high power in an ultra-wide range, which includes a transformer module, a first and second primary input modules, an output module, a high and low voltage mode control module, and a load output module. The first primary input module includes a first primary voltage equalization network, a first switch module and a first LC module, the second primary input module includes a second primary voltage equalization network, a second switch module and a second LC module. The first primary voltage equalization network is connected between a first input capacitor and the second switch module, and the second primary voltage equalization network is connected between a second input capacitor and the first switch module. In this disclosure, it is surprisingly found that through arranging resonant voltage equalization network, a designated primary voltage deviation problem, which is caused by a change of a pulse control of an LLC resonant converter under a light load, is solved.