Abstract: A five level inverter comprises six switch tubes, two inductors, four capacitor units and two reverse current preventing devices. The common terminal of the third capacitor unit and the fourth capacitor unit is connected with the common terminal of the first capacitor unit and the second capacitor unit. The third capacitor unit and the fourth capacitor unit are used as the output filter circuit of the inverter, and the common terminal of the third capacitor unit and the fourth capacitor unit is used as the midpoint of the DC bus.

Abstract: A voltage smoothing circuit includes a first multilayer capacitor, a second multilayer capacitor, and a regulator including an input terminal electrically connected to the second multilayer capacitor and an output terminal electrically connected to the first multilayer capacitor. The regulator calculates a first voltage applied to the first multilayer capacitor based on a second voltage applied to the second multilayer capacitor from the input terminal such that a potential difference which is applied to the first multilayer capacitor decreases or increases when a potential difference which is applied to the second multilayer capacitor increases or decreases, and outputs the first voltage from the output terminal.

Abstract: A voltage smoothing circuit includes a multilayer capacitor including a first capacitance unit and a second capacitance unit and a regulator including an input terminal which is electrically connected to the second capacitance unit and an output terminal which is electrically connected to the first capacitance unit. The regulator calculates a first voltage which is applied to the first capacitance unit based on a second voltage which is applied to the second capacitance unit from the input terminal such that a potential difference which is applied to the first capacitance unit decreases or increases when a potential difference which is applied to the second capacitance unit increases or decreases, and outputs the first voltage from the output terminal.

Abstract: The invention relates to a voltage converter (1) for a motor vehicle. Said voltage converter (1) comprises a transformer (10) and a power output stage (7). The power output stage (7) comprises at least two semiconductor switches (20, 22, 24, 26) that are connected to the transformer (10), in particular to a primary winding (12) of said transformer (10). The voltage converter (1) has a driver stage (31) which is connected, on the output side, to a control connection of the semiconductor switch (20, 22, 24, 26) and which is designed to actuate said semiconductor switch (20, 22, 24, 26) using a control signal (93, 94), for the purpose of generating an alternating voltage. According to the invention, the driver stage (31) is connected, on the input side, to a pulse signal generator (35) and an input capacitor (60, 62).

Abstract: In one implementation, a voltage converter includes a high side power switch, and first and second low side power switches. The voltage converter also includes a driver stage for driving the high side power switch and the first and second low side power switches, and an adaptive OFF-time control circuit coupled to the driver stage. The adaptive OFF-time control circuit is configured to sense a current through one of the first and second low side switches, and to determine an adaptive off time for the high side power switch based on the sensed current.

Abstract: A switching regulator switches a current from input direct current (DC) power to generate target DC power. The switching regulator includes: a direct current (DC)-DC converter and a ripple injection circuit. The DC-DC converter is configured to: generate an output voltage at an output terminal based on an input voltage applied to an input terminal, and according to a switching cycle that selectively forms a voltage-down current path or a voltage-up current path based on a comparison between a reference voltage and a voltage sensed at a feedback node; and apply a feedback current from the output terminal to the feedback node. The ripple injection circuit is configured to: generate a pulse current synchronized with the switching cycle; and apply the pulse current to the feedback node.

Abstract: Provided is a voltage regulator capable of keeping the accuracy of an output voltage thereof even at high temperature. The voltage regulator includes: a reference voltage circuit configured to output a reference voltage; an output transistor configured to output an output voltage; a voltage divider circuit configured to divide the output voltage to output a divided voltage; an error amplifier circuit configured to amplify a difference between the reference voltage and the divided voltage, and output the amplified difference to control a gate of the output transistor; a switching circuit configured to switch the divided voltage of the voltage divider circuit; and a temperature detection circuit configured to output a signal in accordance with temperature to control the switching circuit.

Abstract: A circuit includes a reference circuit configured to receive a reference input voltage and provides a first output signal that is a function of the reference input voltage. The circuit includes a reference adjuster configured to receive an external input signal and generates a second output signal that is a function of the external input signal to control an offset voltage to adjust the first output signal. The first output signal and the second output signal are combined to provide a dynamic reference output signal. If the external input signal has crossed a predetermined threshold, the dynamic reference output signal tracks the external input signal while maintaining a substantially constant voltage difference relative to the external input signal.

Abstract: A method, in some embodiments, comprises: receiving a feedback voltage signal generated by a switch-mode power supply; generating an error signal based on a difference between a switching frequency of the switch-mode power supply and a target frequency; and using the error signal to adjust a ripple amplitude of the feedback voltage signal to control said switching frequency in the switch-mode power supply.

Abstract: A control circuit for a step-up converter includes a soft start module configured to control states of N transistor pairs of the step-up converter, where N is an integer greater than two. A driver module is in communication with the soft start module and configured to generate a first signal when N transistor pairs of the step-up converter are ready to switch. A first charging circuit is configured to charge (N?1) capacitors of the step-up converter to an input voltage of the step-up converter in response to the first signal and to generate a second signal when charging is complete. A second charging circuit is configured to sequentially charge the (N?1) capacitors of the step-up converter to (N?1) predetermined voltage values in response to the first signal and the second signal and before operation of the step-up converter begins.

Abstract: To maximize power efficiency, dead time between “on” times of a synchronous rectifier (“SR”) MOSFET switch and a main switch for CCM operation in particular in isolated and non-isolated self-driven synchronous DC-DC converters needs to be optimized. To accomplish that objective, the latest conduction time t of a body diode of the SR MOSFET following conduction thereof is determined, compared with a selected fixed optimum period T1, and incrementally or decrementally adjusted in a subsequent switching cycle while t is unequal to T1, depending on whether t is shorter or longer than T1, so that t eventually is made substantially equal to T1 in length. This process is to be repeated continuously.

Abstract: A switching power supply device includes: a transformer; a first switch connected between a high potential terminal of an input DC voltage source and a primary winding; a second switch connected between a low potential terminal of the input DC voltage source and a primary winding; a control circuit outputting a driving pulse signal for synchronizing the first and second switches; first and second rectifying devices; a synchronous rectifier circuit; and a positive bias circuit that applies a positive bias to a control terminal of one of the first and second switches so as to constantly turn the one of the first and second switches ON. When the first and second switches stop a switching operation while an output voltage exists between the output terminals, the positive bias circuit applies the positive bias to the one of the first and second switches.

Abstract: The control of an inductive load is implemented by a control strategy to generate a control signal for a switching element on the basis of a setpoint datum, with a mechanism defining a maximum permitted value (Imax) of the current in the load as a function of the temperature at the level of the switching element. The mechanism exhibits a temperature threshold (Tshd). The maximum permitted value (Imax) of the current is held constant, equal to an upper limit value (Isup), during a temperature climb phase for all the temperatures which are lower than the threshold. The maximum permitted value of the current is abruptly rendered equal to a lower limit value (Iinf) as soon as the temperature reaches the threshold. Finally, during a temperature descent phase, the maximum permitted value of the current gradually climbs back to the upper limit value as the temperature decreases.

Abstract: There is provided a power supply apparatus including: a first power supply unit including a transformer switching and transforming an input power, and converting the input power into a first power and providing the first power to a main output terminal and a standby output terminal; a second power supply unit converting the input power into a second power and provide the second power as an operating power of the first power supply unit; and a main switching unit intermitting supplying of the first power from the first power supply unit to the main output terminal.

Abstract: A method includes, in a mobile communication terminal that is powered by a DC-DC converter and is operated by a user in accordance with multiple possible usage scenarios, predefining for each of the possible usage scenarios a repective set of one or more parameters of operation for the DC-DC converter. When the user operates the terminal in accordance with a given usage scenario from among the possible usage scenarios, the predefined set of parameters of operation corresponding to the given usage scenario is selected, without physically sensing an electrical current drawn by the DC-DC converter. The DC-DC converter is configured to supply electrical power to the terminal using the selected parameters of operation.

Abstract: A power conversion system includes a filter unit, a DC/DC converter, a DC link, an inverter, a control unit, and a traction motor. The DC/DC converter is used for boosting DC voltage of a DC source and electrically coupled to the DC source through the filter unit. The DC/DC converter includes multiple SiC MOSFETs configured in a synchronous rectification mode by channel reverse conduction control. The inverter is used for converting the boosted DC voltage from the converter to multi-phase AC voltage through the DC link. The control unit is used for providing PWM commands to the converter and the inverter, to convert the DC voltage to AC voltage configured to drive an AC driven device.

Abstract: A switching power supply is provided and connected between external voltage source and a device having high peak current characteristic, the switching power supply comprises boost converter, control circuit and energy storing element. An input end of boost converter is connected to external voltage source, and output end of boost converter is electrically connected to the device. A control circuit is connected to boost converter in parallel. A first predetermined voltage value and a predetermined current value is set in control circuit. When output current of external voltage source is larger than predetermined current value or output voltage of external voltage source is lower than first predetermined voltage value, output voltage of boost converter is reduced to be lower than the voltage of energy storing element by control circuit.

Abstract: A voltage converter (200) is disclosed, which comprises a controller (210) operable in: a first mode to control the voltage converter so as to convert an input voltage (Vin) at an input (230) of the voltage converter to an output voltage (Vout) at an output (240) of the voltage converter; and a second mode, in which the controller (210) is configurable by configuration control signals (270) so as to change the control applied by the controller to the voltage converter. The voltage converter (200) also includes a power module (280) arranged to derive and supply an operation voltage (Voperation) to the controller (210), the power module (280) being arranged to derive the operation voltage from the input voltage (Vin) during operation of the controller (210) in the first mode, and a voltage source (340) other than the input voltage (Vin) during operation of the controller (210) in the second mode.

Abstract: A power supply system includes: a switching power supply for converting an AC voltage from an AC power supply into a DC voltage; a latching relay provided on an AC input line for switching a connection state of the switching power supply with the AC power supply in response to a relay drive signal; a control device for generating a relay control signal; a relay drive circuit for generating the relay drive signal in response to an input of the relay control signal and driving the latching relay by the relay drive signal; a battery for supplying electric power to the control device and the relay drive circuit when they are connected; and a switch for switching the connection state of the battery with respect to the control device and the relay drive circuit.

Abstract: A bi-modal voltage converter and associated method for reducing stress on secondary rectifiers and decreasing switching losses. An embodiment of the voltage converter comprises three switches and control circuitry that is operative, upon a determination with respect to the input voltage, to select between a two-switch operation and a three-switch operation. When the input voltage is greater than a threshold value, one of the three switches is permanently turned on, while the other two switches are controlled using a pulse-width modulated (PWM) signal. When the input voltage is equal to or less than the threshold value (e.g., requiring a duty cycle greater than 50%), all three switches are controlled by the PWM signal.