153 results about "Step down converter" patented technology

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 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.

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.

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.

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 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).

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.

In embodiments, an electronic device is provided. The electronic device may comprise: a processor including a processing circuit; a radio frequency (RF) transceiver; a first radio frequency front end (RFFE) circuit including a first power amplifier; a second RFFE circuit including a second power amplifier; a battery for providing a battery voltage; and a power supply circuit including a boost converter circuit, which is connected to the battery and configured to provide a boost voltage on the basis of the battery voltage, a first buck converter circuit, which is connected to the battery and the boost converter circuit, and a second buck converter circuit, which is connected to the battery and the boost converter circuit. The power supply circuit may be configured to output a first supply voltage through the first buck converter circuit on the basis of the battery voltage or the boost voltage, and output a second supply voltage through the second buck converter circuit on the basis of the battery voltage or the boost voltage, under the control of the processor.

The application provides a duty cycle control circuit, comprising a first switch module, a first bootstrap circuit and a second bootstrap circuit; an input end of the second bootstrap circuit is used for receiving an input voltage, an output end of the second bootstrap circuit is connected with a first end of the first bootstrap circuit, and the second bootstrap circuit is used for outputting a power supply voltage to supply power for the first bootstrap circuit when the input voltage falls within a preset target output voltage range; the first end of the first bootstrap circuit is connected with a controlled end of the first switch module, a second end of the first bootstrap circuit is connected with an output end of the first switch module, and the first bootstrap circuit is used for providing stable voltage support for driving of the first switch module; an input end of the first switch module is used for receiving the input voltage, and an output end of the first switch module is used for outputting a voltage, which is used as a core switch unit of the circuit to realize transmission and on-off control of the voltage. The above structure can support stable and always-on of the first switch module, achieve stable operation of the 100% duty cycle mode, and improve output stability of a DC-DC step-down converter under a low input voltage working condition.

The present application relates to air conditioner detection technical field, propose a kind of air conditioner electrolytic capacitor health on-line detection method and system, the air conditioner electrolytic capacitor health on-line detection method includes collecting the voltage ripple signal of DC-DC step-down converter output in air conditioner, and detects the zero-crossing time of first time through direct current average voltage in a switching cycle, obtains first zero-crossing time;At the switching on starting moment or switching off moment of switching cycle, single sampling is carried out to output voltage ripple signal, and sampling voltage value is obtained;According to the running state of DC-DC step-down converter, it is judged that DC-DC step-down converter is currently in continuous conduction mode or discontinuous conduction mode;Based on the judgment result, corresponding capacitor parameter calculation model is selected, and the capacitance value and equivalent series resistance of output capacitor are calculated;The capacitance value and equivalent series resistance calculated are compared with preset threshold value, and if exceed threshold value, then trigger capacitor health state early warning.

The application aims to provide a V 2 The application discloses an adaptive ripple compensation circuit of a COT-controlled step-down converter, which can guarantee the stability of a power system and optimize the transient response speed of the system, and has the characteristics that the compensation circuit comprises a P-type MOS transistor PMOS, a first N-type MOS transistor NMOS, a second N-type MOS transistor NM1, a third N-type MOS transistor NM2, a first resistor R0, a second resistor R1, a third resistor R2, a fourth resistor Rs, a fifth resistor R3, a sixth resistor R4, a first capacitor Cout, a second capacitor C1, a third capacitor C2, a fourth capacitor Cs, an inductor L, a comparator CMP, a buffer BUF and an operational amplifier EA.

The invention discloses a buck converter system in a COT mode, and the system comprises a buck main power circuit which comprises a high-side NMOS power tube, a low-side NMOS power tube, an energy storage inductor L and an output filter capacitor, the drain electrode of the high-side NMOS power tube is connected with an input voltage, the source electrode and the drain electrode of the high-side NMOS power tube are connected with a switching node SW, the SW is externally connected with the energy storage inductor L and the positive electrode of the output filter capacitor, and the output filter capacitor is connected with the output filter capacitor; the converter is used for buck conversion from input voltage to output voltage. And the self-adaptive COT control module is connected with the switching node and the output end of the step-down main power circuit, and the self-adaptive COT control module comprises a conduction time reference generation unit, a load current sampling unit and an input voltage sampling unit. According to the invention, through the virtual ripple generation module, a low-ESR ceramic capacitor can be directly adapted, the output voltage ripple is less than or equal to 15mV, the output voltage ripple is reduced by more than 40% compared with a traditional architecture, a peripheral circuit is simplified, and the size of the power supply is reduced.

To provide an electric vehicle capable of charging a battery with a high-voltage external power supply without using an independent step-down converter.SOLUTION: An electric vehicle disclosed herein may comprise a battery, a motor, first and second inverters, a power receiving terminal, and a controller. The motor includes a plurality of stator coils, a first inverter is connected to one ends of the plurality of stator coils, and a second inverter is connected to the other ends of the plurality of stator coils. The power receiving terminal includes a connection positive electrode terminal and a connection negative electrode terminal to which an external power supply is connectable. When the external power supply is connected to the power receiving terminal, the controller turns on and off the second upper switching element while keeping the first lower switching element off. The second upper switching element and the stator coil function as a step-down circuit, and the voltage of the external power supply is stepped down and reaches the battery. The battery can be charged by a high-voltage external power supply.SELECTED DRAWING: Figure 2

A non-isolated DC-to-DC switching hybrid converter is implemented using a cross-coupled series-capacitor quadruple step-down buck converter topology. In some embodiments, the DC-to-DC switching hybrid converter includes a switched-capacitor converter circuit and incorporates a zero-voltage switching network to implement soft switching and a coupled inductor to realize a fixed step-down ratio. The hybrid converter is capable of supporting a high step-down ratio (such as 8:1) while providing high efficiency. In other embodiments, the DC-to-DC switching hybrid converter incorporates a transformer in place of the coupled inductor to further increase the step-down ratio.

This disclosure provides an inverting buck-boost converter and its control circuit, power chip, and electronic device, including a peak reference voltage generation circuit and a peak current mode control circuit. The peak reference voltage generation circuit determines the error amplification voltage based on a reference voltage and the output feedback voltage of the inverting buck-boost converter. Based on the error amplification voltage, the absolute value of the output voltage of the inverting buck-boost converter, and the input voltage of the inverting buck-boost converter, the peak reference voltage is determined. When a step change occurs in the input voltage, a feedforward quantity is generated based on the input voltage to cancel most of the possible disturbances in the output voltage before the output voltage is disturbed. This can reduce the overshoot of the output voltage and shorten the response time while affecting the loop bandwidth, thereby improving the transient response capability of the line while ensuring the stability of the inverting buck-boost converter.

A method and related apparatus for performing discontinuous conduction mode (DCM) pulse control of a buck converter to reduce inductor loss is provided. The method may include performing multi-pulse control on the buck converter, causing the buck converter to operate in DCM; and during performing the multi-pulse control on the buck converter to cause the buck converter to operate in the DCM, generating a plurality of pulses per cycle to cause an inductive current of an inductor within the buck converter to be boosted multiple times and then reduced to reduce the inductor loss.

The invention relates to a charging device (100b) for charging an energy store, said charging device having an AC-DC converter (110) with connections (130.1, 130.2, 130.3, 130.4) for a plurality of phases (a, b, c) for an alternating voltage and for a neutral conductor (N), said AC-DC converter (110) having half-bridges (H1, H2, H3), each half-bridge being connectable on the input side to the connections of the phases, wherein the half-bridges are connected together on the output side in each case to a positive intermediate point (110 +) and a negative intermediate point (110-), the charging device having two intermediate circuit capacitors (C1, C2), the intermediate tap between the two intermediate circuit capacitors being connected to a connection for a neutral conductor, wherein the charging device has a plurality of step-down DC-DC converters (B1, B2, Bn), which can be connected on the input side to a positive and a negative intermediate point, respectively, and which can be connected on the output side to a positive and a negative DC voltage connection, a positive and a negative DC voltage connection (120 +, 120-), and wherein the charging device has a first switch (S1), wherein a selected one of the half-bridges can be connected on the input side by means of the first switch in a first position (j1) to a respective connection of a respective phase and in a second position (j2) to a connection (130.4) for a neutral conductor.

The invention relates to a DC-DC converter for transferring energy from a high-voltage network into a low-voltage network. For this purpose, a circuit configuration is used which can be operated either as an active clamp flyback converter or as an active clamp buck converter.