A switching control circuit includes a first current source, a second current source, a first switch disposed between the first current source and a gate of a switching element, and a second switch disposed between the second current source and the gate of the switching element. The first switch and the second switch are complementarily turned on and off according to a pulse signal. At least one of a value of current supplied to the gate of the switching element from the first current source when the first switch is turned on, and a value of current that flows out from the gate of the switching element to the second current source when the second switch is turned on, is changed periodically.

A timer for creating a stable on time. The timer may have a reference voltage source, and an input voltage source. The voltage sources providing voltage that can be applied to a various circuit components such as capacitors, inductors, resistors, diodes, transistors, or other components. The reference voltage source may also be modified by a set of transistors coupled as a diode before being seen by an input of a timer comparator. The reference and input voltage source signals, which may be modified by circuit components, are compared by the timer comparator and then output as a timer control signal. The timer control signal may control a voltage converter, or the switches of a voltage converter.

A timer for creating a stable on time. The timer may have a reference voltage source, and an input voltage source. The voltage sources providing voltage that can be applied to a various circuit components such as capacitors, inductors, resistors, diodes, transistors, or other components. The reference voltage source may also be modified by a set of transistors coupled as a diode before being seen by an input of a timer comparator. The reference and input voltage source signals, which may be modified by circuit components, are compared by the timer comparator and then output as a timer control signal. The timer control signal may control a voltage converter, or the switches of a voltage converter.

A DC-DC switching converter is described, with a high magnetic coupling ratio between coils connected directly to a supply and ground, and with pass-device switches connected directly to an output. The pass-device switches are driven in such a way that the coils are magnetized alternately. The DC-DC switching converter may use multiple output switches, to supply multiple outputs. The DC-DC switching converter may use different turns-ratio on the coils, to adjust the duty-cycle of the switching converter operates, for a given supply voltage to output voltage ratio.

A DC-DC switching converter is described, with a high magnetic coupling ratio between coils connected directly to a supply and ground, and with pass-device switches connected directly to an output. The pass-device switches are driven in such a way that the coils are magnetized alternately. The DC-DC switching converter may use multiple output switches, to supply multiple outputs. The DC-DC switching converter may use different turns-ratio on the coils, to adjust the duty-cycle of the switching converter operates, for a given supply voltage to output voltage ratio.

A boost DC-DC converter includes: an input terminal; an output terminal; a first boost circuit configured to generate, from an input power to the input terminal, a first boosted power having a higher voltage than a voltage of the input power, and outputs the generated first boosted power from the output terminal; a second boost circuit configured to generate, from the input power, a second boosted power having a higher voltage than the voltage of the input power; and a storage capacitor configured to store the second boosted power as a storage power, and supply the storage power to the first boost circuit as an operation power source. The first boost circuit is configured to start a boost operation with the storage power when a voltage of the storage power is equal to or higher than a minimum operation voltage of the first boost circuit.

A boost DC-DC converter includes: an input terminal; an output terminal; a first boost circuit configured to generate, from an input power to the input terminal, a first boosted power having a higher voltage than a voltage of the input power, and outputs the generated first boosted power from the output terminal; a second boost circuit configured to generate, from the input power, a second boosted power having a higher voltage than the voltage of the input power; and a storage capacitor configured to store the second boosted power as a storage power, and supply the storage power to the first boost circuit as an operation power source. The first boost circuit is configured to start a boost operation with the storage power when a voltage of the storage power is equal to or higher than a minimum operation voltage of the first boost circuit.

A smart desk includes a desk body and at least one desk leg. The desk body includes a desktop and a DC power supply installed on the desk body. In addition, the DC power supply includes a voltage adjustment unit connected thereto in order to adjust an output DC voltage value depending upon the needs. The desk leg is attached onto the bottom surface of the desk body for supporting thereof. Accordingly, the smart desk is able to provide the functions of reading, office working, item storage, and providing a DC power source.

A smart desk includes a desk body and at least one desk leg. The desk body includes a desktop and a DC power supply installed on the desk body. In addition, the DC power supply includes a voltage adjustment unit connected thereto in order to adjust an output DC voltage value depending upon the needs. The desk leg is attached onto the bottom surface of the desk body for supporting thereof. Accordingly, the smart desk is able to provide the functions of reading, office working, item storage, and providing a DC power source.

A power supply apparatus includes a boosting converter, an inrush current limiting element, a detection circuit, a switch element, and a control circuit. The inrush current limiting element is configured to limit an inrush current to the boosting converter. The detection circuit is configured to detect whether an output voltage of the boosting converter has reached a set voltage. The switch element is configured to short-circuit the inrush current limiting element. The control circuit is configured to operate the switch element according to the detection to short-circuit the inrush current limiting element.