A frequency regulating circuit for a switching circuit, a frequency regulating method, and the switching circuit are provided. The frequency regulating circuit includes a charging current generating module configured to receive a first signal characterizing an output power and a second signal characterizing an input voltage to generate a charging current and a signal generating module configured to output a third signal according to the charging current. The third signal is used to adjust the maximum operating frequency of the switching circuit so that the maximum operating frequency decreases with the increase of the input voltage. Therefore, the frequency regulating circuit increases the maximum operating frequency of the switching circuit under the condition of low voltage input, which decreases the maximum operating frequency of the switching circuit under the condition of high voltage input to reduce the switching loss of the switching circuit with wide input voltage and improve efficiency.

A flyback power converter includes a controller, a high-end driving circuit, an active clamp switch, a main switch and a zero current detection circuit. The high-end driving circuit is coupled to the controller. The active clamp switch is coupled to the high-end driving circuit for driving the active clamp switch. The main switch is coupled to the controller. The zero current detection circuit is coupled to the controller. The main switch and the active clamp switch are arranged on the primary side of a transformer. The switching period of a gate of the active clamp switch and the switching period of a gate of the main switch are controlled in reverse phase to achieve zero voltage or zero current conversion.

A power supply system and operating method thereof are provided. The power supply system includes a power generation circuit and a discharge circuit. The power generation circuit is configured to provide an output voltage at an output end when a power is started, and stop providing the output voltage when the power is off. The discharge circuit includes a capacitor, a comparison circuit, and a switch circuit. The comparison circuit is configured to compare a voltage at a detection end and the output voltage at the output end to generate a comparison result. The switch circuit is configured to discharge the output end according to the comparison result when the power is off. The power supply system and an operating method thereof provided by the disclosure can reduce loss when the power is off, so as to improve the operation quality of the circuit.

A ripple voltage detector circuit comprises a pulse generator, a direct current-to-direct current (DC-DC) converter coupled to the pulse generator, and a first control loop coupled to the pulse generator and the DC-DC converter. The first control loop is configured to measure an output voltage of the DC-DC converter, determine an output ripple voltage of the output voltage, determine a ripple coefficient based on the output ripple voltage, determine a reference peak inductor current based on the ripple coefficient, and determine a peak value of an inductor current during a switching cycle, and transition a switching state of the DC-DC converter based on the reference peak inductor current and the peak value of the inductor current.

A system, method, and non-transitory computer-readable medium are disclosed for intelligently controlling a power supply system of an information handling system. At least one embodiment is directed to a method that includes receiving power from an adapter and providing the power from the adapter to a switching power supply. At least one embodiment of the method also includes controlling the plurality of power switching elements to provide system power to an information handling system through the switching power supply; detecting a light loading power condition of the information handling system. In response to detecting the light loading power condition, the switching power supply is deactivated and a bypass control module is activated. In at least one embodiment, activation of the bypass control module directs power from the adapter through the bypass control module to the information handling system as the system power.

Embodiments of this application disclose a converter, applied to the field of power supply technologies, and including a direct current power supply, a first switching transistor, a second switching transistor, a resonant capacitor, a transformer, a secondary-side circuit, and a control circuit. The secondary-side circuit is connected to a secondary-side winding of the transformer, and includes a rectifier diode and a parasitic diode corresponding to the rectifier diode. The direct current power supply, the first switching transistor, and the second switching transistor are connected in series, the resonant capacitor and a primary-side winding of the transformer are connected in series, and a loop formed in series is connected in parallel at two sides of the first switching transistor. The control circuit controls the first switching transistor and the second switching transistor to be turned on or off.

An electrical system includes: 1) a buck converter; 2) a battery coupled to an input of the buck converter; and 3) a load coupled to an output of the buck converter. The buck converter includes a high-side switch, a low-side switch, and regulation loop circuitry coupled to the high-side switch and the low-side switch. The regulation loop circuitry includes: 1) a main comparator; 2) a bias current source coupled to the main comparator and configured to provide a bias current to the main comparator; and 3) a dynamic biasing circuit coupled to the main comparator and configured to add a supplemental bias current to the bias current in 100% mode of the buck converter. The supplemental bias current varies depending on an input voltage (VIN) and an output voltage (VOUT) of the buck converter.

A programmable switch converter controller for a power stage with a switch, an inductor, and a diode, includes a pulse-width modulator. The pulse-width modulator is configured to: generate an on-time interval (Ton) that is fixed or proportional to a demand signal proportional to a load adapted to be coupled to an output of the power stage; generate an off-time interval (Toff) that is inversely proportional to the product of a voltage across the inductor while the switch is off and a demand signal proportional to the load; initiate Ton when Toff elapses; and initiate Ton responsive to an external trigger signal.

An outdoor unit includes: first, second, third, and fourth connection terminals all of which are connected to an indoor unit; a power converter; and a switch unit provided between the first connection terminal and the power converter. The indoor unit includes: a first indoor unit terminal connected to the first connection terminal; a second indoor unit terminal connected to the second connection terminal; a third indoor unit terminal connected to the third connection terminal; a fourth indoor unit terminal connected to the fourth connection terminal; and a switch provided between the first indoor unit terminal and the fourth indoor unit terminal. The switch unit includes: a first switch that is closed when receiving power supply from the second and fourth connection terminals; and a second switch connected in parallel with the first switch. AC power is applied to the first and second connection terminals. The indoor unit closes the switch upon receiving a start signal, and the outdoor unit closes the second switch after supply of AC power to the power converter starts.

In an embodiment, a method for operating a voltage step-down switched mode power supply includes delivering an output voltage with an output stage having a power transistor that is cyclically made conducting by a first control signal. In PWM mode, the method includes generating an error voltage based on the output voltage and a reference voltage, and applying a first delay on a first control signal. The first delay is determined so as to reduce a difference between the error voltage and the reference voltage.