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 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 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.