23 results about "Ripple cancellation" patented technology

A digital controller for a switching converter configured to receive an input voltage and to generate an output voltage, the switching converter comprising one or more power switches and an energy storage element, the digital controller comprising a ripple cancellation signal generator configured to generate a ripple cancellation signal, the digital controller being configured to receive a digitized current signal, the digitized current signal being a digital representation of a current flow through the energy storage element, generate a filtered digital current error signal using the digitized current signal and the ripple cancellation signal, the ripple cancellation signal being arranged to reduce ripple from the digitized current signal in the generation of the filtered digital current error signal, and control the switching converter, the control of the switching converter being dependent on the filtered digital current error signal, wherein the ripple cancellation signal, within each signal period, comprises a rising slope comprising a first non-linear portion, and / or a falling slope comprising a second non-linear portion.

The invention provides a ramp signal generation circuit and a ramp signal generation method for a power converter. The ramp signal generating circuit compensates the slope of the ramp signal according to the slope compensation curve, and non-linearly adjusts the slope of the ramp signal in a predetermined duty ratio interval of a current ripple offset point of the power converter. The ramp signal generation circuit disclosed by the invention is particularly suitable for a multi-phase power converter and a multi-level power converter, and can effectively solve the problem of gate pulse mixing near a current ripple offset point. By adopting the slope modulation technology, the circuit optimizes the dynamic response performance while keeping the stability of the system. In a working interval of a non-current ripple offset point, the circuit maintains a lower slope signal slope to ensure the system bandwidth. In the preset duty ratio interval near the current ripple offset point, the slope of the ramp signal is smoothly improved in a nonlinear adjustment mode, so that the problem of system oscillation caused by sudden change of the slope in a traditional scheme is avoided.

The invention relates to a light-weight network-based voltage wave crest and wave trough rapid identification method and system, and the method comprises the steps: constructing a multi-dimensional input vector through voltage and load current dual-channel synchronous collection and feature fusion; real-time reasoning is carried out on the voltage wave crest and wave trough probability based on a lightweight neural network, and a high-confidence-coefficient triggering mark signal is generated in combination with dynamic threshold value comparison; mapping the trigger mark into a multi-phase conduction time sequence deviation matrix by using an asymmetric phase deviation algorithm, and dynamically adjusting a phase difference parameter in combination with a load current; and through a complementary PWM control instruction group generation and closed-loop optimization mechanism, ripple cancellation of staggered conduction of the multi-phase switch tubes is realized. The method solves the problem of insufficient ripple suppression caused by high false triggering rate and rigid phase distribution in traditional fixed threshold detection, remarkably improves the voltage stability and dynamic response speed in a sudden change scene from light load to heavy load, and can be widely applied to high-precision power supply systems such as data centers and communication equipment.

The invention provides a cascade system control method and a cascade system, the cascade system comprises a first inductor and N power modules (N is an integer greater than or equal to 2), each power module is provided with a first side and a second side, a branch formed by connecting the first sides of the N power modules in series bears a first voltage, and the second side of the N power modules bears a second voltage. The second side of each power module is subjected to a second voltage. Each power module includes a switch operating with a switching cycle. And determining the number of the power modules working in the high-frequency modulation mode according to the ratio of the first voltage to the second voltage, so that the moment when the current flowing through the switch is 0 exists in one switching period. The invention provides a soft switching solution, which can reduce the turn-on loss and is favorable for improving the power density of the cascade system. The condition that ZVS cannot be realized when the duty ratio is about 0 or 1 in a carrier cascading modulation means and the condition that ZVS cannot be realized due to ripple cancellation in a carrier phase-shifting modulation means can be avoided.

Disclosed herein is a voltage regulator having a capacitive feed-forward ripple cancellation circuit, which includes a pass unit configured to transfer, in response to a control signal, an input voltage provided from an input terminal to an output voltage of an output terminal, an error amplification unit configured to output a comparison signal on the basis of a magnitude comparison result between the output voltage and a reference voltage, and a capacitive feed-forward ripple cancellation unit configured to remove a ripple included in the input voltage using the reference voltage and the comparison signal in order to generate the control signal. In accordance with the present invention, a circuit capable of removing power supply noise while consuming a low quiescent current through a capacitive feed-forward ripple cancellation technique can be provided.

The invention discloses a hysteresis current control method and system for a two-level grid-connected converter, and belongs to the technical field of converter control. The method comprises the following steps: fixing the switching frequency of the converter through a frequency inner ring; generating a reference square wave and collecting a switch square wave; multiplying and accumulating the two in each control step length, and taking an accumulated value as a phase discrimination result at the rising edge of a switching period to finish switching phase discrimination; comparing a phase discrimination result with a phase reference value, and processing the phase discrimination result by a PI (Proportional Integral) controller; pI output is processed and then fed back to a frequency instruction, a phase outer ring is formed through a frequency-phase integral relation, and closed-loop control of a switch phase is achieved. The technical problems that a traditional hysteresis control switch is random in phase and multi-machine parallel ripple offset cannot be achieved are solved, the advantage of dynamic performance of hysteresis control is kept, meanwhile, accurate fixing of the switching frequency and the phase is achieved, the system performance is remarkably improved, and the application scene of the system is expanded.

The invention discloses a high power supply rejection low dropout linear regulator based on level feed-forward ripple elimination. The high power supply rejection low dropout linear regulator is characterized by comprising an AEA error amplifier, a level shift circuit and an Mp power tube, the output end of the AEA error amplifier is electrically connected with the input end of the level shifting circuit through the zero point following circuit, the output end of the level shifting circuit is electrically connected with the grid electrode of the Mp power tube, and the source electrode of the Mp power tube is electrically connected with the VDD power supply; the drain electrode of the Mp power tube is electrically connected with one end of the resistor R1, the other end of the resistor R1 is grounded through the resistor R2, and the other end of the resistor R1 is electrically connected with the positive input end of the AEA error amplifier; the drain electrode of the Mp power tube is grounded through the CL capacitor, and the drain electrode of the Mp power tube serves as the output end of the high power supply suppression low dropout linear regulator and outputs voltage for eliminating feedforward ripple waves; and elimination of feed-forward ripples of the power supply voltage is realized.

Systems and apparatus for a voltage converter are described. A circuit may include a plurality of switching elements, a first transformer, and a second transformer. The first transformer may be configured to receive an input voltage at a first voltage level. The first transformer may be further configured to reduce the input voltage based on a state of the plurality of switches to generate an output voltage. The output voltage may be at a second voltage level less than the first voltage level. The second transformer may be connected in parallel with the first transformer. The second transformer may be configured to perform ripple cancellation on the output voltage. The second transformer may be further configured to provide the output voltage to a load operating at a second voltage level.

The invention provides a ripple elimination circuit with a self-zeroing function and a chopping operational amplifier, and relates to the technical field of analog integrated circuits, and the ripple elimination circuit comprises an input sampling unit, a post-stage chopping unit, an integral self-zeroing unit and a feedback unit. A first switch group is arranged in the input sampling unit, and a corresponding zero-setting switch group is arranged in the integral self-zero-setting unit. Through specific clock control, when the integral self-zeroing unit is in an offset voltage sampling phase, the first switch group is turned off, and an input sampling capacitor is physically isolated from a subsequent integral zeroing loop; and in a signal amplification phase, the first switch group is switched on, and a signal path is established. According to the design, the interference of external ripples on the offset voltage storage process at the sampling phase is effectively blocked, and the accuracy of the compensation current is remarkably improved in combination with optimized sequential control, so that an excellent ripple elimination effect and extremely low residual offset voltage are realized, and the method is suitable for an ultra-high-precision analog operational amplifier.

Systems and devices for voltage converters are described. A circuit can include a plurality of switching elements, a first transformer and a second transformer. The first transformer can be configured to receive an input voltage at a first voltage level. The first transformer can be further configured to reduce the input voltage to generate an output voltage based on states of the plurality of switches. The output voltage can be at a second voltage level that is less than the first voltage level. The second transformer can be connected to the first transformer in parallel. The second transformer can be configured to perform ripple cancellation on the output voltage. The second transformer can be further configured to provide the output voltage to a load that operates under the second voltage level.

The present invention relates to a slow-start circuit suitable for boosting power supply. The circuit includes a load module, a control module, a ripple elimination module, a power module, a first switch module, and a second switch module. The power module is connected to the control module. The first switch module is arranged at the output end of the power module and is respectively connected to the load module and the ripple elimination module to form a boost power supply branch and an absorption branch. The first switch module is also connected to the control module to form a first switch branch. The first switch branch is activated at the initial stage of boosting power supply to synchronize the boost power supply branch and the absorption branch. The second switch module is respectively connected to the control module and the first switch module to form a second switch branch. The second switch branch is activated T time after the first switch branch is activated to cooperate with the first switch branch to jointly control the boost power supply of the power module, and the T time is not less than the charging time of the absorption branch. This circuit improves circuit stability.

The invention discloses a full-bridge inverter output ripple offset network and a coupling inductor design method thereof. The full-bridge inverter output ripple offset network comprises a full-bridge circuit which is electrically connected with a coupling inductor; the first upper port is electrically connected with the dotted terminal of the first coupling winding, and the synonym terminal of the first coupling winding is electrically connected with the synonym terminal of the third coupling winding, one end of the output capacitor and the second upper port; the first lower port is electrically connected with the synonym terminal of the second coupling winding, and the dotted terminal of the second coupling winding is electrically connected with one end of the ripple capacitor, the other end of the output capacitor and the second lower port. The ripple counteracting network provided by the invention can effectively reduce the amplitude of the output ripple, suppress higher harmonics and realize low-distortion harmonic output under the condition that the volume of a filter is not obviously increased in a manner of transferring high-frequency ripple current through a coupling winding; according to the design method of the coupling inductor, the most common circular magnetic ring is used for inductor winding, and accurate control over self inductance and mutual inductance of the coupling inductor can be conveniently achieved.

The application provides a slope signal generation circuit and a slope signal generation method for a power converter. The slope signal generation circuit compensates the slope of the slope signal according to a slope compensation curve, and non-linearly adjusts the slope of the slope signal in a predetermined duty cycle interval of a current ripple cancellation point of the power converter. The slope signal generation circuit disclosed in the application is particularly suitable for multi-phase power converters and multi-level power converters, and can effectively solve the problem of gate pulse mixing near the current ripple cancellation point. By using the slope modulation technology, the circuit optimizes the dynamic response performance while maintaining system stability. In the working interval of the non-current ripple cancellation point, the circuit maintains a low slope signal slope to ensure the system bandwidth. In the predetermined duty cycle interval near the current ripple cancellation point, the slope signal slope is smoothly increased through a non-linear adjustment mode, thereby avoiding the system shock problem caused by the sudden change of the slope in the traditional scheme.

A voltage converter circuit includes a switched-mode voltage converter and a ripple cancellation circuit. The switched-mode voltage converter includes a first switching device having a first terminal coupled to a first power supply terminal, and a second switching device having a first terminal coupled to a second terminal of the first switching device, and a second terminal coupled to a second power supply terminal. The ripple cancellation circuit includes an op amp having a non-inverting input coupled to a load terminal; a first resistor coupled between the output of the op amp and an inverting input of the op amp; a second resistor coupled between the second terminal of the first switching device and the inverting input of the op amp; a first capacitor coupled in parallel with the first resistor; and a third resistor coupled between the output of the op amp and the load terminal.

This invention provides a method for eliminating DC secondary ripple in a through-type traction device based on multi-port collaboration, comprising: acquiring electrical quantities at three ports; constructing a second harmonic power component model for each port based on the electrical quantities at the three ports; constructing a secondary ripple elimination optimization model based on the second harmonic power component model, using the reactive power at the first input port, the reactive power at the second input port, and the voltage phase at the output port as optimization variables, with the objective function of minimizing the total second harmonic power on the DC side; solving the secondary ripple elimination optimization model to generate collaborative modulation control commands. This invention requires no additional hardware and can actively suppress DC-side secondary ripple simply by optimizing the control strategy. It can reduce DC bus voltage fluctuations, lower the requirements for supporting capacitor configuration, and is of great significance for improving the operational stability, power quality, and engineering application value of the new through-type traction power supply system.

The invention discloses an operational amplifier circuit and a PCB (Printed Circuit Board). The operational amplifier circuit comprises an external signal input end, a differential bootstrap input unit, a voltage differential hysteresis dynamic bias unit and a ripple offset unit, the external signal input end is used for providing a differential signal for the differential bootstrap input unit and providing a clock signal for the ripple offset unit; the differential bootstrap input unit is used for amplifying a differential signal and respectively sending a differential output voltage and a single-ended amplified signal to the voltage differential hysteresis dynamic bias unit and the ripple offset unit; the voltage differential hysteresis dynamic bias unit is used for feeding back dynamic bias current to the differential bootstrap input unit according to the signal change rate of the differential output voltage; the ripple offset unit is used for offsetting the clock ripple of the single-ended amplification signal according to the clock signal and outputting the single-ended signal; by introducing a differential bootstrap network, a signal slope dynamic matching mechanism and a ripple suppression circuit, the problems of limited noise suppression, extensive power consumption control and insufficient collaboration are solved.

A power converter apparatus includes: a pair of input terminals and a pair of output terminals; a first series circuit including a first inductor and a first switch element and being connected in parallel to the pair of input terminals; a switching circuit that switches, by using a second switch element, a voltage between both ends of the first switch element; a power converter circuit that converts an input voltage inputted to the pair of input terminals to a predetermined output voltage and then outputs the output voltage to the pair of output terminals; and a ripple cancellation current generator circuit that, in case of the first switch element being turned on and off, generates a ripple cancellation current for cancelling a ripple current generated by accumulation and discharge of current energy to and from the first inductor.

To reduce a circuit scale in a successive approximation register analog to digital converter (SARADC) provided with a circuit that cancels a ripple. A digital-to-analog converter generates at least one of a pair of analog signals according to a predetermined control signal. A comparator compares the pair of analog signals and outputs a comparison result. A logic circuit generates a control signal on the basis of the comparison result. A plurality of switches opens and closes a path between one of a source and a drain of each of a plurality of positive-side transistors having different sizes and a plurality of negative-side transistors having different sizes and an output terminal of the comparator on the basis of the control signal. A positive-side common capacitor has one end connected to a node of a predetermined positive-side reference voltage, and has the other end connected in common to each of the gates of the plurality of positive-side transistors. A negative-side capacitor has one end connected to a node of a negative-side reference voltage lower than the positive-side reference voltage, and has the other end connected in common to the gates of each of the plurality of negative-side transistors.

The invention discloses a multi-harmonic-source low-voltage direct-current power supply system active filtering method and system based on local current detection, and relates to the technical field of low-voltage direct-current power supply. The current ripples at the position can comprehensively reflect the whole system ripples after multiple harmonic sources and loads at different positions are superposed, dependence on specific load access positions is not needed, the influence of load position uncertainty on ripple suppression is fundamentally overcome, it is ensured that the active filter can output compensation ripples in a targeted mode all the time, effective suppression is achieved, and meanwhile the effect that the compensation ripples are effectively suppressed is achieved. The quasi-proportional resonance controller has high-gain suppression capability on specific frequency ripples, stable control of the proportional-integral controller on a direct-current component is combined, and the accuracy of ripple elimination and the stability of system operation can be considered at the same time through double-instruction cooperation; through the real-time feedback of the inductive current and the rapid adjustment of the proportional controller, the ripple change can be dynamically responded, and the real-time cancellation of the ripple can be realized.

This invention discloses an LDO circuit based on a flip-flop voltage follower and dual feedforward zero-point stability compensation, comprising a flip-flop voltage follower, a dual feedforward zero-point compensation network, an embedded feedforward ripple cancellation network, a bias network, and a level shifting network. The flip-flop voltage follower dynamically adjusts the output voltage of the power output PMOS transistor. The dual feedforward zero-point compensation network performs zero-point compensation on the two non-dominant poles of the circuit. The bias network provides appropriate bias to ensure that the MOS transistor in the error amplifier operates at the correct operating point, thereby providing sufficient DC gain. The embedded feedforward ripple cancellation network achieves a feedforward path by multiplexing the signal transmission path of the error amplifier, effectively reducing additional noise sources. Simultaneously, the feedforward gain of the embedded feedforward ripple cancellation network can be adjusted by the bias network to meet the ripple cancellation requirements, ultimately achieving a high power supply rejection ratio over a wide frequency range.

The invention relates to a ripple real-time offset circuit of a self-oscillation fluxgate sensor. The ripple real-time offset circuit comprises a measuring winding Lm, a measuring resistor Rm, a current sampling device, a ripple signal extraction module and a real-time offset module, the current sampling device is used for sampling a current signal flowing through the measuring winding in real time and outputting the signal to the ripple signal extraction module; the ripple signal extraction module samples a mixed signal flowing through the measurement winding in real time through the current sampling device, separates a ripple component from the mixed signal, and outputs a ripple reference signal representing the ripple component to the real-time offset module; and the real-time counteracting module is configured to generate counteracting current which is equal to the ripple current in amplitude and opposite to the ripple current in phase on the basis of the ripple reference signal, inject the counteracting current onto the measuring resistor Rm, and counteract the ripple current on the measuring resistor Rm in real time. The ripple current can be counteracted in real time, and the measurement error is remarkably reduced.

A method for reference ripple cancellation in an oversampled single-ended Successive Approximation Register (SAR) Analog to Digital Converter (ADC) includes sampling an input voltage onto a plurality of first capacitors of a switching Digital to Analog Converter (DAC) during a sampling phase. A first output of the switching DAC is compared to a second output of a non-switching DAC during a first conversion phase. A first digital code is generated from the comparison of the first output to the second output. The first digital code is applied to the non-switching DAC during a second conversion phase subsequent to the first conversion phase.

The invention provides a ripple elimination circuit, a DC-DC converter, a method, a chip and equipment. And fourth current can be obtained through the ripple elimination circuit according to the first current and the third current. The ripple elimination circuit can obtain a first signal according to the second current and the fourth current. Thus, the ripple elimination circuit can generate a pulse width modulation signal according to the first signal and the second signal. The third current changes along with the change of the input voltage of the DC-DC converter, so that the fourth current also changes along with the change of the input voltage. Therefore, the flip point of the first signal changes along with the change of the input voltage, so that the rising edge of the pulse width modulation signal changes along with the change of the input voltage. Furthermore, the pulse width modulation signal can change along with the change of the input voltage. Therefore, the DC-DC converter can eliminate the influence of the input voltage on the output voltage ripple, reduce the output voltage ripple, and ensure the stability of the output voltage.