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

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.

The invention relates to a low-noise linear Hall sensor reading circuit and a working method thereof. The circuit comprises a Hall element, a rotary current circuit, a first amplifier, a chopper, a second amplifier, a PTAT current generation circuit, a switch capacitance notching filter and a buffer, wherein the Hall element is connected with the rotary current circuit, the output end of the rotary current circuit is connected with the input end of the first amplifier, the output end of the first amplifier is connected with the input end of the chopper, the output end of the chopper is connected with the input end of the second amplifier, the output end of the second amplifier is connected with the input end of the switch capacitance notching filter, the output end of the switch capacitance notching filter is connected with the input end of the buffer, the PTAT current generation circuit is connected with the input end of the second amplifier, and the output end of the buffer servers as the output end of the low-noise linear Hall sensor reading circuit. According to the circuit and the working method thereof provided by the invention, the ripple amplitude of the circuit can be reduced while the offset voltage and 1/f noise of the circuit can be effectively eliminated, and thus the whole circuit accuracy is improved.

An electric vehicle drive DC-DC converter and an electric vehicle are provided in which the electric vehicle drive DC-DC converter is constructed by connecting a plurality of DC-DC converter units in parallel, and in which a smoothing capacitor is allowed to be reduced in size thereof so that the DC-DC converter unit can be constructed in a small size, and electric power required by the electric vehicle can be coped with by only increasing the number of DC-DC converter units. Each of the DC-DC converter units includes: a coil having both ends thereof being connected to a DC power source and an electric vehicle drive source (motor); and a drive element which is connected in parallel to the electric vehicle drive source and driven in response to a signal supplied from a control circuit, the drive element having combined therewith a load current commutation diode. A single smoothing capacitor is connected in parallel to the electric vehicle drive source so that the respective drive elements of the plurality of DC-DC converter units are driven by the control circuit at different timings.

This invention relates to an active and passive single-phase power factor correction circuit composed of a reactor circuit, a magnetic energy resuming switch, a triple resonance circuit and a commutation filter circuit, in which, the reactor circuit carries out sensitive filter to circuit current, the magnetic energy resuming switch carries out capacitive compensation to the circuit current, the triple harmonic magnetic field generated by the secondary of the triple resonance circuit cancels out the primary triple harmonic current, and an AC voltage approximate to square waves and a circuit current approaching to synchronous and sine waveform are generated under the common action of the above three parts of circuits to be rectified and filtered by the commutation and filter circuit to get the DC output voltage with high mean value and low ripple voltage again.

An electric power converter apparatus incorporates a plurality of electric power converter circuits having respective output terminals connected in common, with output power being produced from the common output terminals. Each converter circuit uses an identical switching frequency, in executing power conversion based on PWM control of switching by a plurality of switching elements. The switching operations of the respective converter circuits mutually differ in phase, by an amount determined in accordance with the currently applied PWM duty ratio. The phase difference value is predetermined for minimizing the amplitude of specific harmonic frequency components of a ripple current component in the output current from the apparatus.

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.

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 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. The charge pump voltage stabilizing circuit comprises a charge pump module which is connected with a transistor module and is used for generating an output voltage according to a collected feedback voltage and outputting the output voltage to the transistor module; and the transistor module which is used for providing a load voltage through the energy storage element and outputting the load voltage to a load if the output voltage is greater than the set voltage. In the embodiment of the invention, if the output voltage is greater than the preset voltage, the load voltage is provided by the energy storage capacitor and output to the load, so that the load voltage is notinfluenced by fluctuation of the output voltage, and the ripple amplitude of the load voltage is reduced.

The invention discloses an interleaved parallel PFC circuit comprising chips U4, U5, U6, resistors R55-R93, and capacitors C20 C51. The Boost PFC circuit of the invention has a small current ripple, thereby reducing the switching device stress and the boost inductor size. By adopting the technical scheme of the invention, the defects of Boost inductance of the conventional power factor correctioncircuit is large, the output power is small, the switching device of the circuit bears large current and voltage, and the current ripple is large and the like can be overcome.

The invention discloses a charge pump voltage stabilizing circuit, a voltage stabilizing method and a nonvolatile memory, comprising: a first voltage stabilizing module generates a first control signal when receiving a first trigger signal; a second voltage stabilizing module receives a second The second control signal is generated when the trigger signal is generated; the switching module generates the first trigger signal according to the first control signal and the second control signal to trigger the working state of the first voltage stabilizing module, or generates the second trigger signal to trigger the second stabilizing The working state of the voltage module; the charge pump module controls the working state of the charge pump module according to the first control signal and the second control signal, so as to stabilize the load voltage output to the load. The technical solution provided by the embodiment of the present invention generates the first trigger signal and the second trigger signal through the switching module to trigger different voltage stabilizing modules to work, so that the load voltage output to the load is stable and the ripple amplitude of the load voltage is reduced.