17 results about "Switching power converter" patented technology

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.

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]

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 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 battery charger is provided that includes a switching power converter that regulates an output voltage on an output voltage rail. A transistor couples between the output voltage rail and a rechargeable battery for a system. An error amplifier controls the conductance of the transistor based upon a difference between a battery current conducted by the transistor to the battery and a battery current threshold. A pulse width modulator controls a duty cycle of the switching power converter responsive to a selected error signal from a group of error signals. Based upon which error signal is selected for the duty cycle control, the battery charger either increases or decreases the battery current threshold to assist in keeping the output voltage above a minimum system voltage for the system.

A high efficiency charging system and its power conversion circuit. The power conversion circuit includes an inductive switching power converter and a capacitive switching power converter. The inductive switching power converter is used to switch an inductor to convert a DC power source to generate a first power source. The capacitive switching power converter is used to switch a conversion capacitor to convert the first power source to generate a charging power source. The inductive switching power converter and the capacitive switching power converter determine to operate in a corresponding regulation mode or a corresponding short-circuit conduction mode according to a parameter of the DC power source.

The application discloses a high-voltage bootstrap and driving circuit for a switching power converter and a control method thereof, comprising a high-voltage bootstrap module and a control module, the high-voltage bootstrap module comprising a first transistor, a second transistor, a first bootstrap capacitor, a second bootstrap capacitor, a first power transistor and a second power transistor, the first transistor and the second transistor being used for charging the first bootstrap capacitor and the second bootstrap capacitor, so as to provide a driving voltage for the first power transistor and the second power transistor; the control module is connected with the high-voltage bootstrap module, and is used for outputting a timing control signal according to an input signal, so as to control the first transistor and the second transistor to be turned on or turned off. The application can eliminate unnecessary loss caused by voltage drop on a diode, provide sufficient driving voltage for a power transistor, improve conversion efficiency, and can be widely applied in the technical field of integrated circuits.

An inductor or transformer for a switching power converter includes a primary coil and a secondary coil inside the air gap of the primary coil. A secondary core of the secondary coil is magnetized to saturation by a small current through the primary coil, such that the secondary coil produces a nonzero output voltage when the current through the primary coil crosses zero. The secondary coil may be used to detect a zero-current state of the primary coil and to actuate a switch to operate the converter in critical conduction mode (CCM) or other zero-current-triggered switching mode.

An adaptive dead-time control method, circuit, and switching power converter utilize a Schmitt trigger to detect the voltage at the switching node LX and the gate voltage of the lower transistor, respectively, to control the adaptive dead time of the upper and lower power transistors. When the upper transistor is off, the inductor automatically discharges, causing the LX voltage to drop until it reaches the set LX threshold voltage, at which point the lower transistor is turned on. When the lower transistor's gate voltage falls below its gate threshold voltage, it is completely turned off, and then the upper transistor is turned on. This allows for adaptive dead-time setting under different power supplies and arbitrary power transistor sizes. This invention, by detecting the switching state of the power transistors using a Schmitt trigger, minimizes the body diode conduction time. The power supply voltage range and power transistor size are not limited by the dead time, and the dead-time setting is not affected by the power supply or device size. This ensures that in the switching power converter, one power transistor is off before the other is turned on, achieving excellent turn-on efficiency.

This application provides an inductor current sampling circuit, a switching power converter, a chip, and an electronic device, relating to the field of electronic circuit technology. The inductor current sampling circuit includes: a lower MOSFET sampling circuit for acquiring the inductor current of the switching power converter circuit using the current mirror method of the lower MOSFET to obtain the inductor sampling current; an upper MOSFET fitting circuit for charging a first capacitor based on a first code value during the upper MOSFET's conduction phase to fit the rising phase current waveform of the inductor current at the sampling output terminal; a lower MOSFET fitting circuit for discharging the first capacitor based on a second code value within a first preset time after the lower MOSFET is turned on to fit the first falling phase current waveform of the inductor current at the sampling output terminal; a first switch turning on at the end of the first preset time and turning off when the lower MOSFET is turned off; and a first capacitor converting the inductor sampling current into the second falling phase current waveform of the inductor current when the first switch is turned on. This achieves high accuracy and high robustness in inductor current detection.

A method for generating an inductor current signal representing magnitude of current flowing through an inductor of a switching power converter includes (i) applying a first current signal to a first capacitive device during a first switching state of the switching power converter, the first current signal having a first slope, (ii) applying a second current signal to the first capacitive device during a second switching state of the switching power converter, the second current signal having a polarity that is opposite of a polarity of the first current signal, and (iii) adjusting the first slope to reduce a phase error in a voltage of the first capacitive device.

This application relates to the field of switching power supply converter technology, and provides a negative voltage charge pump circuit and a switching power supply converter. The negative voltage charge pump circuit adds a clock modulation module, a reference voltage generation module, a comparator module, a fourth driver module, and a fifth, sixth, and seventh power transistor to an existing charge pump. When the negative voltage charge pump circuit enters a light-load condition, by shutting down the large-size power transistor and its driver module, only the small-size power transistor remains operational. The small-size power transistor automatically determines whether to operate based on the absolute value of the output voltage, significantly reducing the operating current of the negative voltage charge pump circuit and improving its conversion efficiency under light load. Simultaneously, by using a narrow pulse modulation unit in the clock modulation module to perform pulse width modulation processing, the clock signal driving the small-size power transistor is optimized, further reducing circuit power consumption under light load.