401 results about "Step down converter" patented technology

A method for actuating a DC-to-DC converter, in particular a clocked buck-boost converter that includes at least two switch elements and an inductor or throttle and via which an input voltage is converted into a regulated output voltage, wherein the switch elements are actuated with a variable switch frequency using pulse- and frequency-modulated control signals, where the pulse- and frequency-modulated control signals are derived from a manipulated variable from a regulator, a voltage curve on the switch elements is continuously ascertained or monitored to determine the activation time of the switch elements and to start a new switch cycle, the switch elements are activated if a specified minimum period duration has been exceeded upon detecting a voltage minimum of the ascertained voltage curve on the switch elements.

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.

A system includes: an AC-DC converter; and a DC-DC converter, the DC-DC converter including: a first high voltage buck-boost converter having a secondary side connectable to a first high voltage battery; a second high voltage buck-boost converter having a secondary side connectable to a second high voltage battery; a first low voltage buck-boost converter having a secondary side connectable to a first low voltage battery; a second low voltage buck-boost converter having a secondary side connectable to a second low voltage battery; and one or more transformers having a primary side connected to the AC-DC converter and a secondary side connected to each of a primary side of the first high voltage buck-boost converter, a primary side of the second high voltage buck-boost converter, a primary side of the first low voltage buck-boost converter, and a primary side of the second low voltage buck-boost converter.

An n-level flying capacitor multi-level buck converter, for converting a DC input voltage into a DC output voltage provided at a load. The n-level flying capacitor multi-level buck converter is configured to: operate a first and second pairs of switching elements in a sequence to selectively apply a portion of the input voltage across the output filter; and operate the first and second pairs of switching elements such that each switching element turns on when a voltage across the switching element is zero.

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.

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.

The invention provides a novel direct-current energy collection and management chip and an operation method thereof. The chip comprises a low-voltage cold start loop, a novel MPPT algorithm energy collection circuit and an energy management circuit. The low-voltage cold start loop is used for exciting an internal voltage conversion circuit at a low voltage level, so that the circuit is transited to a normal working state; the novel MPPT algorithm energy collection circuit is used for collecting energy, collecting and converting environment energy into electric energy, and realizing maximum power tracking through the transient enhanced MPPT algorithm circuit; and the energy management circuit is used for judging the state of the CSTOR, inputting a judgment result into the control module to generate different enable signals UV and EN, and starting corresponding management modes Q1 and Q2. According to the invention, the charging management circuit is started to store excess energy in a secondary energy storage element super capacitor or a lithium ion battery, and the DC-DC step-down converter is started to output a stable voltage for a system load, so that high-efficiency management of photovoltaic, thermoelectric and other direct-current environment energy is realized.

Methods and apparatus for converting power using a multi-output switched-mode power supply (SMPS) coupled to a multi-cell-in-series battery, such as charging a two-cell-in-series (2S) battery using a dual-output three-level buck converter coupled thereto, or using a multi-input SMPS circuit receiving power from a multi-cell-in-series battery. One example power supply circuit generally includes a switched-mode power supply circuit having an input node and an output node, a battery comprising multiple cells connected in series, a charge pump circuit having a first terminal and a second terminal, the second terminal of the charge pump circuit being coupled to the battery, a first switch coupled between the output node of the switched-mode power supply circuit and the first terminal of the charge pump circuit, and a second switch coupled between the output node of the switched-mode power supply circuit and the second terminal of the charge pump circuit.

A bootstrap device used for first and second transistors of a buck-boost converter includes first and second bootstrap circuits. The first bootstrap circuit generates a first bootstrap voltage, and determines, based on a change among a first switching voltage, a voltage level of a source terminal of the first transistor and the first bootstrap voltage, whether to charge according to at least one of a DC input voltage, a DC output voltage, and a second bootstrap voltage. The second bootstrap circuit generates the second bootstrap voltage, and determines, based on a change among a second switching voltage, a voltage level of a source terminal of the second transistor, and the second bootstrap voltage, whether to charge according to at least one of the DC input voltage, the DC output voltage, and the first bootstrap voltage. The bootstrap device improves charging efficiency of bootstrap capacitors.

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.

An apparatus may include a printed circuit board including an integrated circuit including buck converter circuitry and an inductor coupled to the integrated circuit.

The invention provides a step-down converter in a COT mode, the step-down converter comprises a main comparator, a conduction time generation module and a PWM generation module, the main comparator is used for comparing a feedback voltage with a reference voltage, the conduction time generation module is used for providing a conduction time signal of the COT mode, and the PWM generation module is set as follows: when the conduction time signal is changed from 0 to 1, the conduction time signal is converted from 0 to 1; judging whether the feedback voltage is smaller than reference voltage; and if the feedback voltage is less than the reference voltage, skipping the turn-off time to enable the high-side power tube to be continuously conducted until the feedback voltage is greater than or equal to the reference voltage, and turning off the high-side power tube of the buck converter. According to the buck converter in the COT mode, the output voltage of the main comparator serves as a judgment standard to judge whether the turn-off time is reduced or skipped, so that the turn-on time of a high-side power tube is prolonged, the output voltage obtains more power, and the buck converter in the COT mode is more beneficial to scenes needing more power.

To provide a charge / discharge control method, a charge / discharge control device, and a charge / discharge control circuit which can make an open winding type rotary electric machine and first and second inverters driving the same function as a boost converter or a step-down converter by an additional relay whose request size (request for current performance) is smaller than the prior art.SOLUTION: When input / output voltage of external equipment 15 is equal to nominal voltage of a battery 10, the external equipment 15 is directly connected to the battery 10. On the other hand, when the input / output voltage is different from the nominal voltage, the external equipment 15 is connected to the battery 10 through a boost converter or a step-down converter configured by using a stator coil, a first inverter 23, or a second converter 24 by connecting one end of the external equipment 15 to a connection part of an upper arm (UU2, VU2, WU2) and a lower arm (UL2, VL2, WL2) of the second inverter 24.SELECTED DRAWING: Figure 2

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.

The present invention belongs to the field of power electronic automatic control, and discloses a noise suppression and anti-interference control method of a cascade LADRC based on a filter for a DC-DC-buck. The content is that, based on the ADRC idea, a new cascade LADRC noise suppression and anti-interference control method based on a filter is proposed for the output voltage amplitude and phase loss caused by the output filtering of a traditional buck converter. By comparing the simulation analysis of traditional double closed-loop PI, LADRC and LADRC containing a filter, the method of the present invention compensates for the output amplitude and phase loss while suppressing noise, effectively utilizes the real-time estimation and compensation capability of the cascade LADRC for the buck system, improves the robustness of the system, ensures the tracking accuracy of the system, and at the same time, effectively improves the anti-interference capability of the system in the case of sudden load change.

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.