88 results about "Switching power converter" patented technology

An integrated circuit is provided for driving the gate of a GaN power switch transistor in a switching power converter. During a first portion of an on-time period for the GaN power switch transistor, the integrated circuit charges the gate through a relatively high pull-up resistance. During a second portion of the on-time period, the integrated circuit charges the gate through a relatively low pull-up resistance. During a first portion of an off-time period for the GaN power switch transistor, the integrated circuit discharges the gate through a relatively low pull-down resistance and then discharges the gate through a relatively high pull-down resistance in response a voltage of the gate falling below a threshold voltage.

A semiconductor die for an inductor-based switching power converter includes a semiconductor layer stack, a first enhancement mode, N-channel metal oxide semiconductor field effect transistor (first NMOS FET) formed in the semiconductor layer stack, a second enhancement mode, N-channel metal oxide semiconductor field effect transistor (second NMOS FET) formed in the semiconductor layer stack, first driver circuitry formed in the semiconductor layer stack, second driver circuitry formed in the semiconductor layer stack, and bootstrap capacitance. The first driver circuitry is configured to drive the first gate from a bootstrap power rail in response to a first control signal, and the second driver circuitry is configured to drive the second gate in response to a second control signal. The bootstrap capacitance includes one or more bootstrap trench capacitors formed in the semiconductor layer stack, and each bootstrap capacitor is electrically coupled between the bootstrap power rail and the switching node.

A power factor correction (PFC) control circuit includes a pulse-width modulation (PWM) circuit configured to control a switch of a switching power converter. The PFC control circuit further includes a mode control circuit configured to select a conduction mode from a plurality of conduction modes for the switching power converter based at least in part on an output power of the switching power converter and to control a beginning of a switching cycle of the switching power converter based on the selected conduction mode. In addition, the PFC control circuit includes a current regulation circuit configured to provide a regulation signal to the PWM circuit to regulate an average coil current of the switching power converter in each of the plurality of conduction modes.

A method for operating a switching power converter to reduce ripple current magnitude includes (a) controlling duty cycle of a plurality power stages of the switching power converter to regulate at least one parameter of the switching power converter, each power stage including a respective power transformer, and (b) controlling an injection stage of the switching power converter to reduce voltage across leakage inductance of each power transformer, the injection stage including an injection transformer that is electrically coupled to a respective secondary winding of each power transformer.

The invention relates to an operation mode control technique for a power factor correction circuit. A power factor correction (PFC) control circuit includes a pulse width modulation (PWM) circuit configured to control a switch that switches a power converter. The PFC control circuit also includes a mode control circuit configured to select a conduction mode from a plurality of conduction modes for the switching power converter based at least in part on an output power of the switching power converter, and controlling a start of a switching cycle of the switching power converter based on the selected conduction mode. Further, the PFC control circuit includes a current regulation circuit configured to provide a regulation signal to the PWM circuit to regulate an average coil current of the switching power converter in each of the plurality of conduction modes.

The invention relates to the technical field of semiconductors, and provides an impact negative charge driving circuit for suppressing crosstalk and a switching power supply converter, and the circuit comprises a driving module and an impact negative charge module. A first end of the driving module receives an input signal, and a second end of the driving module is connected with a grid node of the silicon carbide MOSFET and is used for controlling on and off of the silicon carbide MOSFET according to the input signal; a first end of the impact negative charge module receives an input signal, a second end of the impact negative charge module is connected with a power supply end, a third end of the impact negative charge module is connected with a ground end, and a fourth end of the impact negative charge module is connected with a grid node of the silicon carbide MOSFET. When the drain voltage of the silicon carbide MOSFET rises to cause the Miller current to flow backward to the gate node, negative charges are released to the gate node to neutralize the Miller current. Efficient crosstalk suppression is achieved through a physical mode of charge neutralization, dependence on a continuous negative voltage power supply is not needed, the system architecture is simplified, and the cost is reduced.

System which includes the following: a peak current mode controller for controlling the cycle operation of a power switch in a switching power converter for controlling an output voltage to a nominal value, wherein the peak current mode controller includes a comparator (520) to generate a turn-off command in response to a comparison of a multiplied fault signal with a signal (Isense) representing an input current into an AC / DC power converter; an upper threshold voltage (VOUT-limit) matching circuit (530) configured to increase an upper threshold voltage (VOUT-limit) in response to an increase in a voltage ripple between the output voltage and the nominal value, wherein the upper threshold voltage (VOUT-limit) matching circuit (530) is further configured to decrease the upper threshold voltage in response to a decrease in the voltage ripple; a lower threshold voltage (VOUT lower limit) matching circuit (535) configured to decrease a lower threshold voltage (VOUT lower limit) in response to an increase in voltage ripple, wherein the lower threshold voltage (VOUT lower limit) matching circuit (535) is further configured to increase the lower threshold voltage in response to a decrease in voltage ripple; and a mode control circuit (525) configured to allow the comparator (520) to control the cycling of a power switch when an output voltage for the switching power converter is both lower than the upper threshold voltage (VOUT upper limit) and higher than the lower threshold voltage (VOUT lower limit), and to prevent the comparator (520) from controlling the cycling of the power switch when the output voltage is higher than the upper threshold voltage (VOUT upper limit) or lower than the lower threshold voltage (VOUT lower limit).

A control circuit for reducing reverse recovery charge in a switching converter includes a first control signal configured to switch a first transistor, a second control signal configured to switch a second transistor, and an auxiliary control signal configured to switch an auxiliary transistor. A first terminal and a second terminal of the first transistor are coupled in parallel to a first terminal and a second terminal of the auxiliary transistor. The first transistor and the second transistor are coupled to a switching node, configured to periodically switch an inductor to convert an input voltage into an output voltage. A delay time exists between the time when the auxiliary control signal is deactivated and the time when the first control signal is deactivated. The auxiliary control signal is deactivated after the second control signal is activated.

The utility model discloses a resonant LLC switching power supply converter and a zero-voltage switch control circuit thereof, and the converter comprises a first switch module, a second switch module, a third switch module, a fourth switch module, a first capacitor module, a second capacitor module, a third capacitor module, an inductor module, and an isolation module. The zero-voltage switch control circuit comprises a reference voltage module, a current detection module, a first control module and a second control module, and the reference voltage module, the current detection module, the first control module and the second control module work cooperatively. The switching loss of the first switching module and the second switching module of the resonant LLC switching power supply converter is dynamically controlled and greatly reduced.

A universal power conversion system for a solar panel array includes a first solar panel generating a first power output; a second solar panel generating a second power output different from the first power output; a common DC bus in communication with the first and second solar panels; a first switching power converter between the first solar panel and the common DC bus, which receives the first power output, and outputs a third power output at a first MPP; a controller which receives, from the common DC bus, the third power output at the first MPP and the second power output in parallel with the third power output. The second power output is maintained at a second MPP to achieve an MPP-maintained fourth power output. The controller further combines the third power output with the MPP-maintained fourth power output, and produces a combined output for a destination sink.

An integrated circuit is provided to drive the gate of a GaN power switching transistor in a switching power converter. During the first part of the on-time period for the GaN power switching transistor, the integrated circuit charges the gate through a relatively high pull-up resistor. During the second part of the on-time period, the integrated circuit charges the gate through a relatively low pull-up resistor. During the first part of the off-time period for the GaN power switching transistor, the integrated circuit discharges the gate through a relatively low pull-down resistor and then discharges the gate through a relatively high pull-down resistor in response to the gate voltage falling below a threshold voltage.

A system is provided that includes a diode bridge for rectifying an AC input voltage. A main switching power converter converts a rectified input voltage of the diode bridge to an output voltage. The flyback converter is coupled to the pre-bridge node or the post-bridge node to receive an input voltage that is converted to a supply voltage for the controller integrated circuit. The controller integrated circuit regulates both the output voltage and the supply voltage.

A soft switching power converter includes a main switch, a freewheeling switch, and an inductive coupling unit. The main switch is a controllable switch. The freewheeling switch is coupled to the main switch. The inductive coupling unit is coupled to the main switch and the freewheeling switch. The inductive coupling unit includes a first inductor, a second inductor coupled to the first inductor, and an auxiliary switch unit. The auxiliary switch unit is coupled to the second inductor to form a closed loop. The main switch and the freewheeling switch are alternately turned on and turned off. The auxiliary switch unit is controlled to start to be turned on before the main switch is turned on to provide at least one current path.

Comparator circuitry for power converters. In an example, a circuit includes a comparator having a first comparator input, a second comparator input, and a comparator output, the comparator coupled to a supply terminal. The circuit further includes a first transistor coupled between a boot terminal and the first comparator input and having a control terminal coupled to a switching terminal, and a second transistor coupled between the boot terminal and the second comparator input and having a control terminal coupled to the switching terminal. Also, a third transistor is coupled between the supply terminal and the second comparator input, and a voltage reference generator is coupled to the supply terminal and to a control terminal of the third transistor.

A method implemented by a control circuit adaptively controls operating parameters of a switched-mode power supply to compensate for variation in circuit parameters of the switched-mode power supply, such as variation of: an inductance of an inductor, a capacitance of an output capacitor, and variation of a load capacitance coupled to an output of the switched-mode power supply. The control circuit includes a comparison circuit that determines whether or not an output voltage of the switched-mode power supply has exceeded an overshoot threshold, and a switching control circuit that has an input coupled to an output of the comparison circuit. The switching control circuit adaptively adjusts a control variable that controls one or more operational parameters of the switched-mode power supply in conformity with a relationship between a value of the output voltage and a value of the overshoot threshold in response to the output of the comparison circuit.

A single-stage, multi-output switching power converter is provided, incorporating a switch at each output. A secondary controller operates the switches to distribute a secondary winding current to the multiple outputs, thereby regulating a different output voltage at each output.

An integrated common-mode inductor includes an iron core, a first winding, a second winding, and a third winding. The iron core includes a center magnetic part, a first side magnetic part, and a second side magnetic part. The first winding is wound on the second side magnetic part, and wound on the first side magnetic part. The second winding is wound on the second side magnetic part. The third winding is wound on the second side magnetic part. The first winding wound on the first side magnetic part provides a differential-mode magnetic flux. The first winding, the second winding, and the third winding wound on the second side magnetic part provide a common-mode magnetic flux.

In an example apparatus, a latch (108) includes a first node (128) coupled to a source of a first switch (110) and an output (130) coupled to a gate of the first switch (110). A first diode (218) is coupled to the first node (128) and a second node (224). A second diode (220) is coupled to the second node (224) and ground (132). A second switch (206) is coupled to a voltage source (200) and the second node (224). A third switch (212) includes a gate coupled to the second switch (206), a third source coupled to the second node (224), and a third drain coupled to the latch (108).

LED DRIVER, SYSTEM, AND METHOD FOR CONTROLLING LED DRIVER ABSTRACT The present disclosure generally relates to a LED driver, a system comprising the same, and a method for controlling the same. The LED driver comprises: an input port; a plurality of output ports, each output port being configured to be electrically connected to at least one LED; a switched power converter including a plurality of converter branches, each converter branch being electrically connected between the input port and a respective output port among the plurality of output ports and comprising a switch for power conversion; and a control unit configured to control the plurality of converter branches in an interleaved manner, the switch of each converter branch being switched on for a corresponding on-time interval within an interleaving period and switched off for a remainder of the interleaving period, wherein the control unit is configured to control the on-time intervals corresponding to the plurality of converter branches such that at least one converter branch has a corresponding on-time interval that is different from at least one other converter branch. [FIG. 2A]

An electronic device is disclosed. In one aspect, the electronic device includes a printed circuit board (PCB) having a first surface and a second surface opposite the first surface, where the PCB includes a thermally conductive region having a plurality of vias that extend from the first surface to the second surface; a semiconductor device attached to the second surface of the PCB and overlying the thermally conductive region; a transformer having a magnetic core; a shield arranged to partially enclose the transformer and define an opening; and an insert disposed within the opening, attached to the first surface of the PCB and overlying the thermally conductive region.

The application belongs to the technical field of electronic circuits, and provides a negative voltage charge pump circuit, a switching power converter and an electronic device. The application adds a reference voltage generation module, a comparison module, a fourth driving module, a fifth power tube, a sixth power tube and a seventh power tube on an existing charge pump. The application generates a third reference voltage, i.e. a threshold voltage when the negative voltage charge pump circuit enters light load, by using the reference voltage generation module, and then compares the third reference voltage and an error voltage output by an error amplifier by using the comparison module to determine whether the negative voltage charge pump circuit enters a light load working condition. When the negative voltage charge pump circuit enters the light load working condition, the large-size power tube and the driving module thereof are closed, and only the small-size power tube is enabled. While ensuring other performances of the negative voltage charge pump circuit, the working current of the negative voltage charge pump circuit in light load is greatly reduced, and the conversion efficiency of the charge pump circuit in light load is improved.

A spread spectrum control circuit generates a pulse-width modulation (PWM) signal with a switching frequency to control a switching power converter. The switching power converter includes a power stage, which includes an inductor and at least one switch coupled to each other, and the at least one switch is controlled by the PWM signal to convert an input voltage to an output voltage. The spread spectrum control circuit includes: a spread spectrum adjustment circuit, for generating a spread spectrum adjustment signal based on operating parameters of the switching power converter, thereby controlling the switching frequency exhibiting spread spectrum characteristics; and a PWM circuit, for adaptively adjusting a spread spectrum adjustment parameter of the spread spectrum characteristic according to the spread spectrum adjustment signal, such that the spread spectrum adjustment parameter are adaptively adjusted with the changes in the operating parameters, thereby generating the PWM signal exhibiting spread spectrum characteristics.

A control circuit and a voltage regulating unit therein for a switching power converter are proposed. The voltage regulating unit according to various embodiments of the present disclosure can include a switching buck regulating module and a low-dropout linear regulating module. The control circuit includes the voltage regulating unit, the switching buck regulating module can be coupled to a power input terminal of the control circuit for providing a buck output voltage at a buck output terminal thereof, and the low-dropout linear regulating module can be coupled to the power input terminal and the buck output terminal for being powered by the power input terminal during a first operation period and being powered by the buck output voltage during a second operation period. This helps to improve the overall system efficiency when the switching power converter is applied to a scenario where the input voltage (or both the input voltage and the output voltage) is higher than the steady-state value of the buck output voltage, and reduce power consumption and heat generation.

A single-stage multiple-output switching power converter is provided that includes a switch in each output. A secondary controller controls the switches to distribute a secondary winding current to the multiple outputs so as to regulate a different output voltage at each multiple output.

The embodiment of the application discloses a kind of power switch drive circuit and power converter, it is related to switching power converter technical field.The power switch drive circuit includes: electromagnetic interference (EMI) detection circuit, first asynchronous sampling circuit, second asynchronous sampling circuit, comparison circuit, off-chip control circuit, first gate drive circuit, second gate drive circuit;EMI detection circuit, first / second asynchronous sampling circuit, comparison circuit, off-chip control circuit, first gate drive circuit are sequentially connected, finally through adjusting first gate drive signal, the EMI performance of adjusting power converter is realized.The circuit carries out on-chip EMI detection to switching voltage signal by EMI detection circuit, and compares the EMI detection result under different circuit states, realizes by off-chip control circuit dynamic adjustment gate drive circuit to keep the best circuit performance, to ensure high efficiency and high energy density, while, wide-area EMI suppression is realized, and the robustness and industrial applicability of circuit are improved.

This application provides a switching power supply, a switching power converter, and a control method thereof. The switching power converter includes: a first switching transistor; a transformer including a first winding and a second winding, the first winding and the first switching transistor being connected; and an asymmetric resonant unit including a resonant capacitor and a second switching transistor, wherein a branch of the resonant capacitor connected in series with the second switching transistor is connected in parallel with a target winding, the target winding being either the first winding or the second winding. The asymmetric resonant unit is configured such that: when the first switching transistor is turned off and the voltage of the target winding is greater than a first threshold, the second switching transistor is turned on, and the freewheeling current generated by the target winding charges the resonant capacitor; when the first switching transistor is turned off and the voltage of the target winding is less than a second threshold, the second switching transistor is turned off, so that the resonant capacitor does not participate in the system LC resonance of the switching power converter, wherein the second threshold is less than or equal to the first threshold.

This application relates to the field of semiconductor technology. Embodiments of this application provide a surge negative charge driving circuit and a switching power converter for suppressing crosstalk, comprising: a driving module and a surge negative charge module; a first terminal of the driving module receives an input signal, and a second terminal of the driving module is connected to the gate node of a silicon carbide MOSFET, used to control the turn-on and turn-off of the silicon carbide MOSFET according to the input signal; a first terminal of the surge negative charge module receives the input signal, a second terminal of the surge negative charge module is connected to a power supply terminal, a third terminal of the surge negative charge module is connected to a ground terminal, and a fourth terminal of the surge negative charge module is connected to the gate node of the silicon carbide MOSFET, used to release negative charge to the gate node during the turn-off process of the silicon carbide MOSFET when the drain voltage of the silicon carbide MOSFET rises, causing Miller current to flow back to the gate node, in order to neutralize the Miller current. Highly efficient crosstalk suppression is achieved through the physical method of charge neutralization, without relying on a continuous negative voltage power supply, simplifying the system architecture and reducing costs.

A semiconductor die for an inductor-based switching power converter includes a semiconductor layer stack, a first enhancement mode, N-channel metal oxide semiconductor field effect transistor (first NMOS FET) formed in the semiconductor layer stack, a second enhancement mode, N-channel metal oxide semiconductor field effect transistor (second NMOS FET) formed in the semiconductor layer stack, first driver circuitry formed in the semiconductor layer stack, second driver circuitry formed in the semiconductor layer stack, and bootstrap capacitance. The first driver circuitry is configured to drive the first gate from a bootstrap power rail in response to a first control signal, and the second driver circuitry is configured to drive the second gate in response to a second control signal. The bootstrap capacitance includes one or more bootstrap trench capacitors formed in the semiconductor layer stack, and each bootstrap capacitor is electrically coupled between the bootstrap power rail and the switching node.

A power module includes a power substrate, a number of power semiconductor die, and a number of connector pins. The power substrate includes a number of conductive traces. The power semiconductor die are mounted on the power substrate and electrically coupled to the conductive traces. The connector pins are each electrically coupled to a different one of the conductive traces and configured to be interconnected such that the power semiconductor die provide an active front-end and a switching power converter. By providing the power semiconductor die such that they can be interconnected to form an active front-end and a switching power converter in the same power module, the power module may provide a significantly more compact power converter system using both an active front-end and switching power converter.

A molded inductor includes a winding having leads configured for attaching leads of the winding to pads on a package substrate, having a magnetic core with a body disposed within the winding, wherein the magnetic core has at least one mold flow enhancing feature that enhances a filling of a magnetic mold material as compared to a filling provided by a uniform cylindrical body. The magnetic mold material encases the winding and the magnetic core to form either a standalone discrete inductor component, or the magnetic component of an output filter of an integrated switching power converter module.