328 results about "Step down converter" patented technology

The invention provides a COT step-down converter comprising an inductive current detection circuit configured to detect an inductive current flowing through an inductor connected to a system output of an output voltage of an output system of the COT step-down converter, and generate a current zero-crossing detection signal indicating whether the inductive current crosses zero, the inductive current zero-crossing means that the inductive current is changed from positive current to negative current; and a sleep mode control circuit configured to generate a sleep mode control signal for controlling one or more circuit modules in the COT buck converter to change from an operating state to a closed state based on the current zero-crossing detection signal, an output feedback voltage representing a system output voltage of the COT buck converter, and a predetermined reference voltage.

In accordance with some embodiments of the present disclosure, a multi-level power converter circuit includes a flying capacitor, a balancing capacitor to control a voltage across the flying capacitor, a plurality of converter switches, a control switch coupled between the flying capacitor and the balancing capacitor, and control circuitry to open and close the control switch based on states of at least two converter switches of the plurality of converter switches. In some embodiments, the multi-level power converter is a three-level buck converter, and the balancing capacitor maintains a voltage across the flying capacitor to be within a threshold range of half the input voltage of the buck converter. In some embodiments, a method for operating the multi-level power converter includes using control circuitry to operate the plurality of converter switches and the control switch to selectively couple the balancing capacitor to either side of the flying capacitor.

Disclosed is an electronic circuit. The electronic circuit includes a first transistor device, a second transistor device, and a third transistor device, each having a control node and a load path. The electronic circuit further includes a drive circuit. The load paths of the first and second transistor devices are connected in parallel, the load path of the third transistor device is connected in series with the load paths of the first and second transistor devices, and the first transistor device and the second transistor device are integrated in a common semiconductor body. The drive circuit is configured, based on a control signal, to successively switch on the first transistor device and the second transistor device, so that the second transistor device is switched on when the first transistor device is in an on-state.

A DC / DC converter includes a converter stage to receive an input voltage and to provide an output voltage from the input voltage in accordance with a modulated drive signal. The converter stage further provides a feedback voltage representing the output voltage. A controller circuit includes an error amplifier to receive the feedback voltage and a reference voltage and to provide an error signal based on the feedback voltage and the reference voltage. A PWM modulator receives a clock signal and the error signal and generates a modulated signal based on the clock signal and the error signal, and a logic circuit receives the modulated signal and generates the drive signal for the converter stage based on the modulated signal so that the drive signal has the same duty cycle as the modulated signal, when the duty cycle of the modulated signal is not smaller than a minimum duty cycle value.

In certain embodiments, a memory module includes a printed circuit board (PCB) having an interface that couples it to a host system for provision of power, data, address and control signals. First, second, and third buck converters receive a pre-regulated input voltage and produce first, second and third regulated voltages. A converter circuit reduces the pre-regulated input voltage to provide a fourth regulated voltage. Synchronous dynamic random access memory (SDRAM) devices are coupled to one or more regulated voltages of the first, second, third and fourth regulated voltages, and a voltage monitor circuit monitors an input voltage and produces a signal in response to the input voltage having a voltage amplitude that is greater than a threshold voltage.

An integrated circuit device includes: one or more switches of a Buck converter; and a control circuit for the Buck converter, including: a comparator configured to compare a feedback voltage of the Buck converter with a compensation ramp voltage; a pulse generator configured to generate, in response to a rising edge in a comparator output signal, a pulse signal for controlling the Buck converter; a transconductance amplifier (TA) configured to generate, at an output terminal of the TA, a current proportional to a difference between a reference voltage and the feedback voltage; a capacitor coupled between an output terminal of the TA and a reference voltage node; and a ramp signal generator configured to generate the compensation ramp voltage by adding a voltage at the output terminal of the TA and a ramp voltage having a gradient proportional to a switching frequency of the Buck converter.

The invention discloses a power supply control system and method for an eVTOL low-voltage distribution box, and relates to the technical field of power supply control, and the system comprises a multi-source double-bus power supply unit, a voltage reduction unit and an output unit. The multi-source double-bus power supply unit comprises a first bus independent power supply channel and a second bus independent power supply channel, the first bus independent power supply channel and the second bus independent power supply channel are isolated based on a contactor, the first bus independent power supply channel comprises x heterogeneous power sources and x ideal diodes, and the x heterogeneous power sources comprise a high-voltage-to-low-voltage DC-DC power source, a ground power source and n lithium battery power sources. The second bus independent power supply channel comprises y paths of heterogeneous power supplies and y ideal diodes, and the y paths of heterogeneous power supplies comprise y paths of lithium battery power supplies; the step-down unit comprises m paths of DC-DC step-down converters; and the output unit comprises m ideal diodes which are connected in parallel with the output end of the DC-DC buck converter. According to the invention, the stability and quality of power supply are ensured, and airborne equipment is ensured to work in a stable voltage and current environment.

The invention discloses a method for improving Buck light load efficiency, which can prevent pseudo CCM operation and can keep high light load efficiency even under a large duty ratio, and comprises the following steps: after soft start of a Buck converter is completed, an enable signal at the end of soft start sets an RS trigger U3 to be in an active state, and if an inductive current zero-cross detection trigger signal rises, the RS trigger U3 is in a non-active state, the RS trigger U3 is in a non-active state, and if the inductive current zero-cross detection trigger signal is in a non-active state, the RS trigger U3 is in a non-active state. When the high-end switch and the synchronous low-end switch are switched on, the setting end input of the RS trigger U3 is triggered, a switch starting signal output by the RS trigger U3 is set at the beginning of each switching period, the switch starting signal controls the constant on-time generator to modulate the charging current or capacitance so as to prolong the time of simultaneously switching off the high-end switch and the synchronous low-end switch, and when the synchronous low-end switch is switched on, the synchronous low-end switch is switched off. And the reset end of the RS trigger U3 inputs an output signal of the constant on-time generator to trigger the RS trigger U3 to reset.

A buck converter with an asymmetric threshold voltage of its gate drive circuit design for improving power efficiency while keeping the gate drive design simple.

An integrated circuit device includes: one or more switches of a Buck converter; and a control circuit for the Buck converter including: a comparator configured to generate a comparator output signal by comparing a feedback voltage of the Buck converter with a compensation ramp voltage; a pulse generator configured to generate, in response to a rising edge in the comparator output signal, a pulse signal for controlling the Buck converter; a transconductance amplifier configured to generate, at an output terminal of the transconductance amplifier, a current proportional to a difference between a reference voltage and the feedback voltage; a capacitor coupled between the output terminal of the transconductance amplifier and a reference voltage node; and a ramp signal generator configured to generate the compensation ramp voltage by adding a voltage at the output terminal of the transconductance amplifier and a ramp voltage generated by the ramp signal generator.

A controller includes a current-mode control device configured to determine a turn-on edge of a first gate-drive signal, an on-time timer that includes a first ramp generator having a first current source, a first capacitor, and a first ramp-generation switch, the first ramp generator configured to generate a first ramp signal, and a first logic circuit having an output coupled to a control terminal of the first ramp-generation switch, the first logic circuit configured to control the first ramp-generation switch based at least in part on the first gate-drive signal and on a feedback signal received from the current-mode control device, thereby resetting the first ramp signal, wherein the on-time timer is further configured to determine a turn-off edge of the first gate-drive signal by comparing the first ramp signal with a first threshold voltage that is proportional to an output voltage of the power converter.

The invention belongs to the technical field of emergency power supplies, and particularly relates to an elevator car emergency power supply which comprises an energy recovery module which comprises a three-phase rectifier bridge, a filter capacitor and a buck-boost DC / DC converter and is used for converting generated alternating current into direct current and stabilizing voltage; the energy storage module adopts a hybrid energy storage framework in which a lithium iron phosphate battery pack and a super capacitor bank are connected in parallel, and bidirectional energy flow is realized through a bidirectional DC / DC converter; the power management module comprises a BMS battery management system and an energy routing controller, and the energy routing controller is used for dynamically distributing the charge-discharge proportion of the super capacitor and the lithium battery pack; the emergency power supply switching module comprises a static change-over switch and a bidirectional inverter and is used for realizing seamless switching between the mains supply and the energy storage power supply; and the monitoring and communication module is used for real-time state feedback and remote control. According to the invention, through collaborative optimization of the three-phase rectifier bridge (with the efficiency of 98%) and the buck-boost DC / DC converter (with the efficiency of 92%), the total conversion efficiency reaches 85%, which is improved by 20-30% compared with a traditional scheme.

An apparatus includes a buck converter portion of a buck-boost converter configured to operate under a constant on-time control scheme, wherein an on-time of a high-side switch of the buck converter portion is determined by a buck on-time timer, and a boost converter portion of the buck-boost converter configured to operate under a constant off-time control scheme, wherein an off-time of a low-side switch of the boost converter portion is determined by a boost off-time timer.

The invention describes a driver circuit for supplying a constant current to an LED arrangement (LED1... LEDN) formed by a buck converter comprising a current measurement resistor (Rsense) in series with a coil (Lbk) that measures the current through the coil (Lbk). A two-point control circuit turns on or off the first switching element (Qh) as a function of a measured current (Vsense) flowing through the coil (Lbk) in order to keep the average current flowing through the LED arrangement (LED1... LEDN) constant. A current amplifier circuit (A sense) is connected to a current measurement resistor (R sense) to detect a current (V sense) flowing through the current measurement resistor, and positive and negative currents can be measured by superimposing an offset voltage (V offset) applied to one of its inputs by an offset voltage source. An output terminal of the current amplifier circuit is connected to an input terminal of the two-point control circuit. The offset voltage (V offset) is also superimposed on its threshold voltage (V peak, V valley). Furthermore, a start-up pulse circuit (Vstart-up) is provided, which is connected to the control input of the first switching element (Qhs) via a diode (Dstart-up).

A buck-boost converter for converting an input voltage at an input node into an output voltage at an output node, the converter comprising: first and second inductor nodes for connection of an inductor therebetween; a first converter stage coupled between the input node and the first inductor node; and a second converter stage coupled between the second inductor node and the output node, wherein one or more of the first converter stage and the second converter stage comprises a switching network, comprising: a first switch for selectively connecting a first flying capacitor node to a stage input node; a second switch for selectively connecting the first flying capacitor node to a stage output node; a third switch for selectively connecting a second flying capacitor node to the stage output node; and a fourth switch for selectively connecting the second flying capacitor node to a reference voltage, the first and second flying capacitor nodes for connection of a flying capacitor therebetween.

A switched-mode power supply includes: a Buck converter; and a control circuit for the Buck converter, which includes: a switching unit configured to generate a switching control signal based on a feedback voltage of the Buck converter and a compensation ramp voltage; a transconductance amplifier, where a first input terminal and a second input terminal of the transconductance amplifier are configured to receive a reference voltage and the feedback voltage, respectively; a switch coupled between an output terminal of the transconductance amplifier and a first node, where the switching unit is coupled between the first node and the Buck converter; a compensation control circuit coupled to a control terminal of the switch and configured to open or close the switch based on a first signal representative of a current flowing through an inductor of the Buck converter; and a ramp signal generator configured to generate the compensation ramp voltage.

Techniques and apparatus for regulating power in a power supply circuit with a three-level buck converter circuit are provided. One example power supply circuit generally includes (i) a three-level buck converter circuit including a switching node coupled to an inductive element and (ii) a control circuit coupled to the three-level buck converter circuit and configured to control the three-level buck converter circuit such that the switching node operates with more than two different constant voltage levels. One example method generally includes operating a three-level buck converter circuit including a switching node coupled to an inductive element such that the switching node operates with more than two different constant voltage levels.

The invention discloses a control circuit, a converter and a system, and relates to the field of integrated circuits, and the control circuit comprises a logic control module, a timing module and a timing expansion module. Outputting a first signal to an upper field-effect tube of the buck converter, wherein the first signal is used for starting the upper field-effect tube; the timing module is connected with the logic control module; the timing expansion module comprises a first switch, a second switch, a first current source, a first capacitor and a first comparator, one end of the first current source is connected with the first switch, the other end of the first current source is connected with the second switch, the positive input end of the first comparator and the first capacitor, and the output end of the first comparator is connected with the logic control module. And by arranging the timing expansion module, the starting time of the upper field effect transistor is prolonged, the load response speed is further improved, and the stability of the equipment is improved.

A system includes: an alternating current (AC) to direct current (DC) converter (AC-DC converter), the AC-DC converter connectable to a line voltage; and a DC to DC converter (DC-DC converter) connected to the AC-DC converter, the DC-DC converter including: a high voltage buck-boost converter having a secondary side connectable to a high voltage battery; a low voltage buck-boost converter having a secondary side connectable to a low voltage battery; and one or more transformers having a primary side connected to the AC-DC converter, a secondary side connected to a primary side of the high voltage buck-boost converter, and a tertiary side connected to a primary side of the low voltage buck-boost converter.

To improve the efficiency of a wind power generation system in a wide range of wind speed sections including a low-speed rotation section where the wind speed is low by quickly following an instantaneous change in wind speed.SOLUTION: The wind power generation system includes a lift-type fixed wing fixed to a rotating shaft, a plurality of three-phase AC generators, a step-up / down converter and a resistance load constituting a load of the wind power generator, and a system controller, and the three-phase AC generator has a rectifier unit that converts a three-phase AC output into a DC output. The step-up / down converter may be connected to the rectifier unit, and the system controller may control the load to follow an optimal TSR (λ) suitable for the fixed wing according to a change in wind speed in real time based on a rotation speed of the rotating shaft, information on a super-instantaneous wind speed obtained from an anemometer, an output of the generator, and a state of the load.SELECTED DRAWING: Figure 12

An electrical power supply assembly is disclosed comprising a first DC / DC converter and a second DC / DC converter, each equipped with a current sensor to determine a respective current. The assembly includes a charge storage device having a boost / buck DC / DC converter and a charge storage medium. Components feature voltage sensors to determine input, output, and charge storage medium voltages. An electronic controller in communication with the converter and the sensor includes a computer readable medium storing instructions that enable the controller to adjust the output power based on the respective currents of the first DC / DC converter and the second DC / DC converter and the input and output voltages when the output voltage is outside a predetermined range. Further, the controller adjusts the output power of the boost / buck DC / DC converter based on the output and charge storage medium voltages under similar conditions, ensuring efficient power management and stability of the electrical power supply component.

A buck converter circuit comprising a pre-charging switch, a first switching element, a second switching element, a third switching element, a fourth switching element, a flying capacitor, a voltage supply node, a first flying capacitor node, a second flying capacitor node, a switch node and a control system. The voltage supply node, the pre-charging switch and the first flying capacitor node are sequentially connected in series. The voltage supply node, the first switching element and the first flying capacitor node are sequentially connected in series. The first flying capacitor node, the flying capacitor, the second flying capacitor node and the fourth switching element are sequentially connected in series. The first flying capacitor node, the second switching element, the switch node, the third switching element and the second flying capacitor node are sequentially connected in series. The control system is configured for executing a pre-charging process and a cyclic converting process.

Power converter circuit (100), comprising: a first buck converter (109) having a first switch (102) with a first gate terminal, a first drain terminal and a first source terminal, and a second switch (104) with a second gate terminal, a second drain terminal and a second source terminal, wherein the first source terminal is coupled to the second drain terminal at a first switching node (103); a second buck converter (111) having a third switch (106) having a third gate terminal, a third drain terminal and a third source terminal and a fourth switch (108) having a fourth gate terminal, a fourth drain terminal and a fourth source terminal, wherein the third source terminal is coupled to the fourth source terminal at a second switching node (117), wherein the second buck converter (111) is coupled in series to the first buck converter (109) at a junction (107) such that the third drain terminal is coupled to the second source terminal; an input terminal (110) coupled to the first drain terminal; an output terminal (118) coupled to the first (103) and second (117) switching nodes; and a control circuit (158) coupled to both the first (109) and the second (111) down converter, the control circuit (158) being arranged to: detecting a voltage at the connection point (107); comparing the detected voltage with a first threshold voltage, and in response to the detected voltage having a lower voltage than the first threshold voltage, the control circuit (158) operates the first buck converter (109) and deactivates the second buck converter; and comparing the detected voltage with a second threshold voltage, and in response to the detected voltage having a higher voltage than the second threshold voltage, the control circuit (158) operates the second buck converter (111) and deactivates the first buck converter (109).

This invention discloses a current-sharing circuit and system based on a COT buck converter. The current-sharing circuit includes a current sampling unit for acquiring a current sampling signal representing the magnitude of the inductor current in the COT buck converter; and a current balancing control unit for converting the current sampling signal into a reference voltage signal that gradually decreases as the inductor current in the COT buck converter increases, thereby achieving current-sharing control. This invention can achieve current-sharing control when multiple phases are connected in parallel within a COT architecture.

The present description relates to a switching step-down converter (3). A first terminal (200) receives a regulated voltage and is coupled to a reference potential (GND) by a resistive element (R). A main loop (208) regulates the regulated voltage from a comparison of a first voltage (Vfb) on the first terminal to a first threshold. A circuit (C) activates a current source (CS) providing a first current (I1) to the first terminal (200) when the first voltage is lower than a second threshold. A current loop (A2) regulates the first voltage to the value of a third threshold by drawing a second current (I2) on the first terminal (200) if the first voltage is higher than the third threshold.

An aerial vehicle electrical power system for use with a tethered aerial vehicle, and related methods are provided. The aerial vehicle electric power system includes a plurality of light-emitting diodes (LEDs) carried by an aerial vehicle. At least one electrical circuit is carried by the aerial vehicle. The at least one electrical circuit has a DC buck converter electrically in series with at least a portion of the plurality of LEDs. An output voltage from the DC buck converter is a fixed ratio of an input voltage into the DC buck converter. A tether is connected between the aerial vehicle and a power source positioned remote from the aerial vehicle. Electrical power is transmitted to the aerial vehicle and at least a portion of the plurality of LEDs through the tether. The electrical circuit minimizes variances in power supplied to the aerial vehicle and the plurality of LEDs.

The invention relates to a method for controlling an electric drive chain (1) of an aircraft fuel pump, the method comprising: receiving (202) a pair of speed and mechanical torque setpoints for an electric motor (2), receiving (204) a maximum voltage setpoint by a direct current high voltage power supply (3), calculating (206) a minimum voltage required at an input of an electric inverter (5) for the pair of setpoints, and controlling the electric drive chain (1) of the aircraft fuel pump. Calculating (208) the loss in the electric drive chain (1) in a voltage range between the minimum voltage and a maximum voltage, the maximum voltage corresponding to said maximum voltage setpoint, selecting (210) an optimal voltage to be applied to the input of the electric inverter (5), the optimal voltage corresponding to the voltage with the lowest loss in the electric drive chain (1), and applying the optimal voltage to the input of the electric inverter (5). And calculating (212) a duty cycle to be applied to the buck converter (6) as a function of the selected optimal voltage.

The utility model relates to a bidirectional buck-boost DC-DC converter. The converter comprises an input terminal; an output terminal; the two-stage conversion circuit is arranged between the input terminal and the output terminal, the first-stage conversion circuit is used for converting an input voltage received at the input terminal into an intermediate voltage, and the second-stage conversion circuit is used for converting the intermediate voltage into an output voltage at the output terminal; and a tank circuit disposed between the two stages of conversion circuits, the tank circuit including a super capacitor and a control switch, the control switch turning on the super capacitor in response to a voltage fluctuation at an output terminal of the bidirectional buck-boost DC-DC converter to stabilize an output voltage at the output terminal. According to the design of the DC-DC converter, the circuit structure is simplified, the cost is reduced, and the overall reliability of the conversion circuit is improved.

The application provides a brush DC motor driving control system and a control method. The brush DC motor driving control system comprises a microcontroller and a driving circuit. The input ends of the driving circuit are connected with a power supply of a target voltage and the output end of the microcontroller respectively. The output end of the driving circuit is connected with a brush DC motor with a rated voltage lower than the target voltage. The microcontroller controls the conduction and turn-off of a switch tube in the driving circuit by adjusting the duty cycle of a PWM signal, so as to drive the brush DC motor to adjust the rotating speed. The application directly drives a low rated voltage motor by using a high voltage power supply without using an independent step-down converter, reduces the electric energy conversion links, reduces the number of components, reduces the size of the circuit board, and effectively reduces the system cost. At the same time, the application avoids the superimposed loss generated by the two-stage cascade of the step-down conversion and the motor driving, the energy transmission path is shorter, and the overall efficiency is significantly improved.

Charging device comprising: a battery (106) suitable and configured to store DC voltage; first and second motors (101, 102) suitable and configured to operate as a motor or a generator; first and second inverters (103, 104) suitable and configured to operate the first and second motors (101, 102); a voltage transformer (105) suitable and configured to increase the DC voltage of the battery (106) to supply it to the first and second inverters (103, 104) and to increase the DC voltage of the inverter to supply it to the battery (106); and a charging controller (200) suitable and configured to operate the first and second inverters (103, 104) as a booster or generator.to operate voltage amplifiers or to operate the voltage transformer (105) as a step-down converter, according to a voltage which is input via a neutral point of the first and second motors (101, 102) and the voltage of the battery (106), wherein the charging control element (200) is configured to switch off the voltage transformer (105) so that the voltage which is increased by the first inverter (103) or the second inverter (104) charges the battery (106) when the voltage which is input via the neutral point of the first and second motors (101, 102) is less than the battery voltage.