31results about How to "Reduce the ripple amplitude" patented technology

The invention provides an alternating current (AC) to direct current (DC) power converter, which comprises a phase-shifting transformer, at least one rectifier group and at least one DC-DC converter, wherein the phase-shifting transformer is provided with a primary winding and at least one secondary winding; at least one secondary winding is set as at least one winding unit; each rectifier group is provided with at least one rectifier; each rectifier is electrically connected to the secondary winding in the corresponding winding unit; and at least one DC-DC converter is electrically connected to the corresponding rectifier group and outputs predetermined DC voltage. Correspondingly, the invention also provides a DC charging station. By the invention, the phase-shifting transformer is provided with at least one secondary winding which is set as at least one winding unit, so different phase-shifting angles can be provided according to the actual quantity of windings in each winding unit, harmonic components in current are decreased, and power factors of a system are increased.

A hybrid coupler (66, 67; 72, 73) has four ports and is capable of coupling radio frequency signals having a certain frequency from at least one port to at least one other port. The hybrid coupler (66, 67; 72, 73) is implemented as a differential coupler arranged to couple differential radio frequency signals. With such a hybrid coupler a power amplifying circuit can be produced which has sufficiently low ripple on the supply voltage to be integrated together with more sensitive radio circuits, and which is also insensitive to load mismatch such that an isolator can be avoided. A differential hybrid coupler allows the output current to be shared between four transistors or amplifiers, thus reducing the amplitude of the ripple. Further, the frequency of the ripple is four times the operating frequency of the circuit, which makes it much easier to filter out the ripple.

The invention relates to the digital signal requantization, at a given quantization step size, of a first word received in a first period of time and encoded in a first number of bits, into a second word, with a quantization error equal to a third number. A sequence of third words is outputted, equal to the second word, with the sequence subdivided into a first group comprising a number of third words that is equal to the third number and a second group of third words. Before outputting them, the correction means adds a least significant bit to the third words of the first group and adds or subtracts least significant bits to or from the third words of the second group, such that the sum of the least significant bits added to and subtracted from the second group is zero.

The invention provides a method for eliminating chopping waves and ripple waves and an analogue-digital conversion circuit for realizing the method. The method comprises the following steps of: carrying out two times of sampling on signals in a chopping wave period at an interval which is one half of time of the chopping wave period; and carrying out integration and summation on two times of sampling values so as to keep useful signals and eliminate residual ripple wave signals in the chopping waves. The signal amplification and analogue-digital conversion circuit comprises a chopping wave amplifier and a sigma-delta analogue-digital converter which is cascaded behind the chopping wave amplifier. A switching structure which is embedded into the sigma-delta analogue-digital converter is adopted and an analogue addition function of a first-grade integrator in the analogue-digital converter can be used for carrying out first-order reshaping (voltage summation) on the residual ripple waves of output signals of the chopping wave amplifier, so that the ripple wave amplitude is reduced and influences on the conversion precision of the analogue-digital converter is weakened. The circuit does not need an analogue low-pass filter between the chopping wave amplifier and the analogue-digital converter, so that the power consumption and the area are saved and the design of the circuit is simplified.

The invention relates to the technical field of photovoltaic grid-connected inverters. A photovoltaic inverter employing a hybrid type power device comprises two parts, namely, a power inversion unit and an inversion control unit, wherein the power inversion unit mainly comprises an input EMI (Electro-Magnetic Interference) filter circuit, an interleaving Boost boosted circuit, a full bridge inversion circuit employing a mixer and an output grid-connected filter circuit; the inversion control unit mainly comprises a power grid phase detection circuit, a sampling circuit and a controller. The photovoltaic inverter adopts a double-stage structure, and the first stage adopts interleaving Boost boosted voltage, so that the fluctuation of current is reduced, and output voltage ripple is reduced; the later stage inversion unit adopts a hybrid power device, so that the inversion consumption is effectively reduced, and the system efficiency is improved. The photovoltaic inverter has the characteristics of simple structure, easiness in circuit control and convenience in capacity expansion.

The invention provides a driving system, air conditioner equipment, a control method and a controller. The driving system comprises a rectification circuit, an inversion circuit and a DC bus circuit,wherein the DC bus circuit is electrically connected between the rectification circuit and the inversion circuit, the rectification circuit comprises a first output end and a second output end, the inversion circuit comprises a first input end and a second input end, the DC bus circuit comprises a first branch, a second branch and a plurality of third branches, the first branch is electrically connected between the first output end and the first input end, the second branch is electrically connected between the second output end and the second input end, an inductor is arranged on the first branch or the second branch, the plurality of third branches are connected in parallel between the first branch and the second branch, and each third branch comprises a capacitor and a switch device which are connected in series. With the driving system provided by the invention, the voltage stability of the DC bus and the reliability of the driving system can be improved.

The invention discloses a charge pump voltage stabilizing circuit, a voltage stabilizing method and a nonvolatile memory, comprising: a charge pump module connected to a transistor module for generating an output voltage according to a collected feedback voltage and outputting it to the transistor module; The transistor module is used to provide the load voltage through the energy storage element and output the load voltage to the load if the output voltage is greater than the set voltage. In the embodiment of the present invention, if the output voltage is greater than the preset voltage, the load voltage is output to the load through the energy storage capacitor, so that the load voltage is not affected by the fluctuation of the output voltage, so as to reduce the ripple amplitude of the load voltage.

The invention discloses a 6-way interleaved parallel Boost PFC circuit, which comprises a Boost circuit, a multi-way flyback circuit, an anti-surge circuit, a UCC28070 module, a rectifier circuit and an EMI circuit. The input end of the EMI circuit is connected to the mains, the output end is connected to the input end of the anti-surge circuit, the input end of the rectification circuit is connected to the output end of the anti-surge circuit, the output end is connected to the Boost circuit, the control end of the Boost circuit is connected to UCC28070, and the output of the Boost circuit 400V DC voltage, multi-channel flyback circuit input terminals connected to Boost output DC400V output terminals respectively provide power to the anti-surge circuit, Boost circuit, and UCC28070 module. The current ripple of the Boost PFC circuit of the present invention is small, and the stress of the switching device and the size of the boosting inductance are reduced.

A three-phase three-level active filter control method of a fused anti-disturbance technology is disclosed. During actual engineering, output filter equivalence inductance and equivalence resistance parameters of an active electric power filter can be deviated from designed parameter values because of being influenced by an operating temperature and other environment factors; and operation of an active filter is unavoidably influenced by various kinds of disturbance factors. Aiming at the above problems, the method is characterized by based on an expanded ohm law in a non-sinusoidal alternating-current circuit, carrying out on-line real-time detection on three-phase output filter equivalence resistance and equivalence inductance parameters of the active electric power filter; and then sending the actually-measured equivalence resistance and equivalence inductance parameters to a controller of the active electric power filter so as to update a corresponding control parameter; and simultaneously introducing auto-disturbances-rejection control into an active filter direct voltage control outer loop. Stability of the active electric power filter can be increased, harmonic wave compensation precision of the active electric power filter is improved, a direct-voltage transient response speed of the active electric power filter is increased and a ripple amplitude is reduced.

The invention relates to a high-frequency multiphase interleaved conversion device and a control method, and belongs to the field of power electronics and electric drive. The device comprises a drive and power amplification unit, an EV (Electric Vehicle) manager module, an AD (Analog-Digital) sampling module, a DSP (Digital Signal Processor) processor, a serial port communication module, an HCI (Human-Computer Interaction) module, a DC (Direct Current) voltage detection circuit, a DC voltage conditioning circuit, a current detection circuit, a current conditioning circuit and a main circuit. The system adopts a double closed-loop control technology and a new topological structure to realize system stability and broad stability margin; three inductors at the front end of the topological structure work alternately, and the equivalent switching frequency is 6 times of the traditional switching frequency, so that the whole converter has high frequency, and the output voltage and the ripple amplitude and harmonic component of current are reduced; and the equal-time work of the three front-end inductors per unit time reduces the power requirements on power components IGBT (Insulated Gate Bipolar Transistor) and diodes, reduces the manufacturing cost of the whole device, and improves the application value of the DC converter.