265 results about "Step down converter" patented technology

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.

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.

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.

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.

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.

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.

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.

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.

The utility model provides an extension socket with a USB charging circuit, and aims to improve charging stability and realize energy-saving management. According to the extension socket, alternating current is converted into stable low-voltage direct current through the AD / DC conversion circuit so as to be used for charging the USB interface. The power supply conversion part comprises a synchronous rectification module, a transformer, a primary side feedback control module and an optocoupler feedback module circuit, and can effectively filter high-frequency noise and stabilize output voltage. The charging control circuit comprises an infrared sensor, a current detection module and a switch unit, so as to achieve the functions of automatically starting a charging function when a user approaches and automatically disconnecting a line when no charging current exists, thereby reducing the standby power consumption. The USB charging circuit comprises a direct current step-down converter and a charging protocol management module, supports multiple USB protocols, and provides two modes of common charging and PD fast charging to adapt to the requirements of different devices. The beneficial effects of the design are that power supply stability is improved, energy consumption is reduced, and diversified charging demands of users are satisfied.

Exemplary embodiments of systems, devices, and methods are provided herein for a power supply system configured to generate pulsed power for a load. The power supply system can include cascaded power supply units, each including cascaded power supply cells. Each power supply cell can include a parallel boost converter for regulating a power bus and a buck converter for converting energy on the bus to a regulated output voltage and current.

A circuit of wireless charging and a method of charging a battery. The circuit includes: a wireless receiver, configured to receive a charging power transmitted by a wireless transmitter of a wireless charging apparatus through electromagnetic induction; a charge pump circuit configured to receive a boosted input voltage from the voltage output end, and step down the input voltage to an output voltage of the charge pump circuit, to charge a battery; a step-down converter circuit configured to perform the step-down charging on the battery at least in a case that a charging mode is in a constant voltage mode; and a controller configured to select one between the charge pump circuit and the step-down converter circuit as a charging path to charge the battery based on a voltage difference between the input voltage from the voltage output end of the wireless receiver and a charging voltage of the battery.

A transceiver includes a bidirectional converter, a buck-boost converter and a voltage regulator. The bidirectional converter receives downstream power and converts the downstream power into a rectified voltage. The buck-boost converter converts the rectified voltage into a buck voltage by decreasing a voltage level of the rectified voltage and the voltage regulator converts the buck voltage into a regulated voltage by reducing fluctuations in the buck voltage. In the event that the transceiver outputs upstream power, control circuitry can repurpose the voltage regulator to convert a system voltage into a load voltage by reducing fluctuations in the system voltage, repurpose the buck-boost converter to convert the load voltage into a boost voltage by increasing a voltage level of the load voltage, and repurpose the bidirectional converter to output the boost voltage in the form of upstream power.

The utility model relates to the technical field of light control, specifically relates to a multi -mode light -adjusting controller, it contains power mechanism, power mechanism output direct current's VH and 3V3, set up MCU and the drive chip connected with it in the controller, drive chip controls relay ware one and relay ware two respectively, MCU still has the light coupling ware for realizing switching and synchronous step -down converter, and the synchronous step -down converter output is connected to relay ware two, and the normally open mouth of relay ware two is connected back end for connecting the positive pole of lamp VOUT, this application can automatically identify the load type of access, for example LED or incandescent lamp etc, and then can switch the drive mode, need not according to different type to select different controller, this application adopts relay ware and carries out circuit switching, avoids the mutual interference between different power components.

Certain aspects of the present disclosure generally relate to techniques for operating a three-level buck converter. An example method for operating the three-level buck converter may include: identifying a voltage value based on an input voltage of the three-level buck converter; determining an emulated current for an inductive element of the three-level buck converter based on an expression having a variable associated with a voltage across a flying capacitive element of the three-level buck converter, wherein determining the emulated current comprises assuming the variable to have the voltage value; comparing the emulated current to a threshold; and controlling at least one transistor of the three-level buck converter based on the comparison.

A buck-boost converter includes a converter, for converting an input voltage into an output voltage, the converter including a plurality of switches and an inductor, and a controller for controlling the plurality of switches. The operation of the controller is driven by a finite state machine configured to receive as input state change signals and to provide as output state signals for driving the controller. The state change signals are generated by a comparator based on a comparison of a replica signal and an error signal, wherein the error signal is computed on the basis of a signal representative of a difference between a characteristic of the converter and a predetermined reference signal, and wherein the replica signal is representative of the current flowing through the inductor.

A lighting device (101) for a motor vehicle comprising: a control unit (107) to which a light module (106) is connected; a series connection of bridgeable semiconductor light sources (44-48), wherein the lighting device (101) has a headlight housing (102) in which two light modules (105, 106) are arranged and supplied with electrical energy by the control unit (107) which is remotely connected via connecting lines (110); wherein the control unit (107) is arranged on the outside of the headlight housing (102) in a control unit housing (108); characterized in that the protection circuit (2) is designed to protect the series connection of the bridgeable semiconductor light sources (44-48); that the protection circuit (2) comprises a series connection of a current measuring element (8) and an actuator (10); and that a Zener diode (18) is connected between an actuator terminal (22) of the actuator (10) and an input. (9) of the actuator (10) is arranged,that the control unit (107):- has an input with two input terminals (26, 28) which can be connected to the vehicle's electrical system via a plug / socket element (109),- includes a buck converter comprising a switch (34), a diode (36) and a coil (38), and- has an output capacitor (40) and an input capacitor (42).

A driving control device for a relay for a battery pack, includes: a buck-boost converter to receive a voltage from an auxiliary battery, and output a buck-boost voltage; a feedback control circuit electrically connected to the buck-boost converter, and to transfer a feedback voltage to the buck-boost converter to control the buck-boost voltage output from the buck-boost converter; and a relay control circuit to apply or block the buck-boost voltage to a relay electrically connected to at least one of a positive electrode terminal or a negative electrode terminal of a main battery. The buck-boost converter is to output the buck-boost voltage according to the feedback voltage, and the buck-boost voltage has a smaller sustaining voltage for maintaining the relay in an on state than a first reference voltage for turning on the relay.

An apparatus including a buck circuitry and logic circuitry. The buck circuitry charges a flying capacitor with a voltage in response to a device state being in a charging state and discharges the voltage from the flying capacitor in response to the device state being in a discharging state. The logic circuitry causes the buck circuitry to transition the device state in response to detecting voltage balance during a reference time period and causes the buck circuitry to repeat the device state occurring at the reference time period in response to detecting voltage imbalance during the reference time period.