The present disclosure relates to a voltage source device comprising: a voltage converter for generating a supply voltage at an output node of the voltage converter based on a feedback signal provided on a feedback line; at least one switch coupled between the output node of the voltage converter and an output terminal of the voltage source device; and at least one further switch configured to selectively couple the feedback line to: the output node of the voltage converter during a first regulation mode; and to the output terminal of the voltage source device during a second regulation mode.

An isolated converter with high boost ration includes a transformer, a first bridge arm, a second bridge arm, and a boost circuit. The transformer includes a secondary side having a secondary side first node and a secondary side second node. The first bridge arm includes a first diode and a second diode. The second bridge arm includes a third diode and a fourth diode. The boost circuit includes at least one fifth diode coupled between the first bridge arm and the secondary side second node, at least one sixth diode coupled between the second bridge arm and the secondary side first node, and at least two capacitors coupled to the secondary side first node and the secondary side second node.

An isolated boost converter includes a transformer, a first bridge arm, a second bridge arm, and a boost circuit. The transformer includes a secondary side having a secondary side first contact and a secondary side second contact. The boost circuit includes two diodesanodes of the two diodes are mutually coupled to a first contact and cathodes of the two diodes are coupled to a first bridge arm upper contact and a second bridge arm upper contact, two diodescathodes of the two diodes are mutually coupled to a second contact and anodes of the two diodes are coupled to a first bridge arm lower contact and a second bridge arm lower contact, the second contact is coupled to the first contact, and at least two capacitors are coupled to the secondary side first contact and the secondary side second contact.

A device for controlling a switching mode power supply includes a regulation module, a feedback node, and a resistance module. The regulation module is adapted to cause a switching module to selectively couple, based on an oscillation frequency, a primary side winding of a transformer and a supply to control a voltage, current, or power output at a secondary side winding of the transformer. The feedback node is adapted to receive an indication of a voltage at the secondary side winding of the transformer. The resistance module is adapted to selectively set a pull-up resistance based on a comparison between a time-controlled frequency and a voltage-controlled frequency that is generated based on a voltage at the feedback node, wherein the regulation module is adapted to set the oscillation frequency as the time-controlled frequency or the voltage-controlled frequency.

Controlling switching frequency of a switching power converter. At least some example embodiments are methods of operating a switching power converters, comprising: operating, by a primary-side controller, a switching power converter at a first frequency set by a resistor coupled to a first pin of the primary-side controller; and sensing a synchronization signal applied to the first terminal of the primary-side controller, the synchronization signal has a second frequency that is variable; and operating, by the primary-side controller, the switching power converter at the second frequency.

The power supply apparatus includes a switching element configured to drive a transformer, a primary side and a secondary side of the transformer being insulated from each other, a control unit configured to output a pulse signal for driving the switching element, and a comparing unit configured to compare a target voltage of an output voltage that is output from the secondary side of the transformer and the output voltage, and to control the output voltage to be the target voltage, wherein the comparing unit cuts off an input of the pulse signal to the switching element in a case where the output voltage is larger than the target voltage, and wherein the control unit determines a frequency or an on-duty ratio of the pulse signal according to the target voltage.

The present disclosure relates to a voltage source device comprising: a voltage converter for generating a supply voltage at an output node of the voltage converter based on a feedback signal provided on a feedback line; at least one switch coupled between the output node of the voltage converter and an output terminal of the voltage source device; and at least one further switch configured to selectively couple the feedback line to: the output node of the voltage converter during a first regulation mode; and to the output terminal of the voltage source device during a second regulation mode.

The present invention discloses a power supply circuit and a UPS auxiliary power supply system having the same. The power supply circuit comprises a transformer, a primary-side switch unit and a secondary-side switch unit. When the input power supply is powered on, the second switch of the secondary-side switch unit maintains in an off state, the first switch of the primary-side switch unit performs an on-off action, and the input power supply supplies power to the load and the energy storage unit. When the input power supply is powered down, the first switch of the primary-side switch unit maintains in an off state, the second switch of the secondary-side switch unit performs an on-off action, and the energy storage unit supplies power to the load.

The present application is directed to a display device and an over-voltage protection method. As an example, the display device includes a power source assembly and an electric load. The power source assembly includes an LLC circuit, a transformer and a feedback circuit. An input end of the transformer is connected with a control end of the LLC circuit, a first output end of the transformer is connected with a supply end of the LLC circuit, a second output end of the transformer is connected with the electric load, and the transformer is configured to supply power to the LLC circuit and the electric load. A first end of the feedback circuit is connected with the second output end of the transformer, a second end of the feedback circuit is connected with the feedback end of the LLC circuit and the feedback circuit is configured to supply a voltage derived from the second output end of the transformer to the LLC circuit. The LLC circuit is configured to stabilize a voltage supplied by the second output end of the transformer to the electric load based on the feedback voltage supplied by the feedback circuit.

A power converter including: a dual output resonant converter including a first output, a second output, a common mode control input, and a differential mode control input, wherein a voltage/current at the first output and a voltage/current at the second output are controlled in response to a common mode control signal received at the common mode control input and a differential mode control signal received at the differential mode control input; a dual output controller including a first error signal input, a second error signal input, a common mode control output, and a differential mode control output, wherein the dual output controller is configured to generate the common mode control signal and the differential mode control signal in response to a first error signal received at the first error signal input and a second error signal received at the second error signal input, wherein the first error signal is a function of the voltage/current at the first output and the second error signal is a function of the voltage/current at the second output, and wherein the common mode control signal is output from the common mode control output and the differential mode control signal is output from the differential mode control output; and a common mode signal offset circuit configured to generate a common mode signal offset signal wherein the common mode signal offset signal adjusts a difference in output power between the first output and the second output of the dual output resonant converter.