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1238results about How to "Small ripple" patented technology

A kind of multi-port isolated bidirectional dc-dc converter

The invention discloses a multi-port isolating bidirectional DC-DC (direct current to direct current) converter which is used for a mixed energy storing system. The converter comprises a phase-shifting transformer and a primary side circuit and a secondary side circuit which are respectively connected with a primary side and a secondary side of the phase-shifting transformer; the secondary side circuit comprises a two-path Buck / Boost converting circuit, wherein the two-path Buck / Boost converting circuit comprises two input / output ends and two bridge arm midpoints and the two bridge arm midpoints are respectively connected with two ends of the secondary side of the phase-shifting transformer; and the primary side circuit comprises at least one two-path Buck / Boost converting circuit, wherein the two-path Buck / Boost converting circuit comprises two input / output ends and two bridge arm midpoints and the two bridge arm midpoints are respectively connected with two ends of the primary side of the phase-shifting transformer. The invention further discloses a voltage matching and controlling method of the multi-port isolating bidirectional DC-DC converter and the mixed energy storing system comprising the converter. Compared with the prior art, the multi-port isolating both-way DC-DC converter can realize complete matching of voltage at two ends of a transformer and can prolong the service lives of a storage battery and a super capacitor.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

High voltage gain bidirectional DC-DC (direct current-direct current) converter based on switching capacitors and coupling inductors

The invention discloses a high voltage gain bidirectional DC-DC (direct current-direct current) converter based on switching capacitors and coupling inductors. The high voltage gain bidirectional DC-DC converter based on the switching capacitors and the coupling inductors is formed by combining Boost convertors, the coupling inductors and the switching capacitors in interleaved mode. An electric circuit of the high voltage gain bidirectional DC-DC converter based on the switching capacitors and the coupling inductors comprises n / 2 coupling inductors T1[L1, L2], T2[L3, L4]... T(n / 2)[L(n-1), Ln], 2n high frequency power switches S1, S2... Sn and Q1, Q2... Qn, N-1 high frequency switching capacitors C1, C2... C(n-1) and two input and output filter capacitors CL and CH. The high voltage gain bidirectional DC-DC converter based on the switching capacitors and the coupling inductors can effectively reduce current stress of a low voltage side power device and voltage stress of a high voltage side power device, further reduces the ripple of an input current and decrease the inductor size by using the coupling inductors, improves efficiency of an exchanger, and achieves bidirectional DC-DC conversion high in efficiency and high in voltage gain. According to high voltage gain bidirectional DC-DC converter based on the switching capacitors and the coupling inductors, an interleaved technology, a magnetic integration technology and a switching capacitor technology are combined, and therefore novel topology of the high voltage gain bidirectional DC-DC converter based on the switching capacitors and the coupling inductors not only has characteristics of being low in ripple of the input current and easy to design in EMT mode of an interleaved converter, but also achieves the purposes that a transformation ratio of input voltage and output voltage is large and switch voltage stress is low.
Owner:TIANJIN UNIV

Closed-loop control charge pump circuit

The invention relates to a closed-loop control charge pump circuit, which comprises a basic charge pump circuit and a control loop. The control loop comprises the following circuits which are connected in turn: a sampling circuit, a comparer, an oscillation control circuit, and an oscillator, wherein the sampling circuit is connected with a voltage output end (Vout) of a basic charge pump, and isused for sampling the voltage value of the Vout and generating a sampling voltage value V1 corresponding to the voltage value of the Vout according to a predefined function mapping relation f; the comparer is used for comparing the voltage value V1 with a preset reference voltage Vref and outputting the comparison result V2; the oscillation control circuit receives the comparison result V2 and generates a control signal Ctr1 according to the V2 value; and the oscillation frequency of the oscillator is controlled by the control signal Ctr1 to change continuously, and the oscillator outputs theoscillation frequency as the working frequency of the basic charge pump. Thus, the frequency of the oscillator of the charge pump circuit can be adjusted continuously and dynamically, and the whole charge pump circuit has good power following characteristics and reduces the energy consumption.
Owner:GIGADEVICE SEMICON (BEIJING) INC

Clock adjustment circuit and adjustment method for clock circuit

The invention provides a clock adjustment circuit and an adjustment method for a clock circuit. The clock adjustment circuit comprises a clock buffer amplifier, a phase discriminator and a duty cycle adjustment circuit, wherein the clock buffer amplifier is used for receiving an external differential clock signal, shaping the differential clock signal into a single-end square wave clock signal and outputting the single-end square wave clock signal; the phase discriminator is used for receiving the single-end square wave clock signal from the clock buffer amplifier and a feedback signal from the duty cycle adjustment circuit, comparing the phase of the single-end square wave clock signal with the phase of the feedback signal to acquire a phase difference, and outputting the phase difference; and the duty cycle adjustment circuit is used for adjusting the duty cycle of the feedback signal by using the phase difference to acquire an adjusted feedback signal. The differential signal is shaped into the single-end square wave clock signal, the single-end square wave clock signal is compared with the feedback signal to acquire the phase difference, and the duty cycle is adjusted according to the phase difference, so that the complexity of duty cycle adjustment and hardware implementation can be effectively reduced, phase errors and the ripple waves of control voltage can be reduced, and adjustment accuracy is improved.
Owner:XIDIAN UNIV

PFC (power factor correction) control method with high input power factor and control circuit thereof

The invention provides a PFC (power factor correction) control method with high input power factor and a control circuit thereof. The method comprises the steps of controlling a switching tube to be switched on and switched off according to the principle of leading impulse area to be equivalent, and leading input inductive current and sinusoidal half-wave current to have the equivalent impulse area in each switching period, thereby realizing the high power factor (PF); furthermore, the higher the switching frequency, the closer to 1 the PF value is. In the control circuit, a circuit topological structure of a Boost converter and a control circuit for realizing a variable duty ratio sequence jointly constitute a PFC stage of a commonly used LED (light-emitting diode) driving power supply, the front stage of the PFC stage is connected with the output end of a non-controllable rectifier bridge of a single-phase diode via an input filter capacitor, the back stage of the PFC stage is connected with a DC/DC (direct current/direct current) stage of the commonly used LED driving power supply via an output filter inductor and an output filter capacitor. By adopting the PFC control method, not only the very high input power factor can be realized, but also output voltage ripple can be reduced; furthermore, the control circuit is simple and easy to realize an analog circuit, thereby being conductive to large-scale integration.
Owner:SOUTH CHINA UNIV OF TECH

Cascaded H bridge multilevel converter and control method thereof

A cascaded H bridge multilevel converter and a control method thereof are provided. The converter includes two passive DC buses and a conversion circuit of which the three phases are of the same structure. The conversion circuit includes n cascaded inverter modules of the same structure. Each inverter module includes a photovoltaic sub module and an H bridge unit. Each photovoltaic sub module is a three-port interleaved parallel Boost LLC DC converter. Of the two input ports on the primary side of each photovoltaic sub module, one input port is connected with the output end of a solar photovoltaic power generation module, and the other input port is connected across the two DC buses. The output port of each photovoltaic sub module is connected with the input port of the corresponding H bridge unit. In each phase of conversion circuit, the output ports of the n H bridge units are cascaded to form an output port of the phase of conversion circuit. Photovoltaic module maximum power point tracking and LLC DC converter output voltage control are realized by controlling the duty ratio and switching frequency of a switching tube. Therefore, the problem that the intra-phase and inter-phase output power of the cascaded H bridge converters in a large-scale photovoltaic grid-connected power generation system is imbalanced is solved.
Owner:CHINA UNIV OF MINING & TECH

Surface-treated electro-deposited copper foil and method for manufacturing the same

It is an object to provide a surface-treated electro-deposited copper foil which has a low profile at a level equal to or excellent than that of low-profile surface-treated electro-deposited copper foils that have conventionally been supplied to the market and in which waviness affecting the straight line performance of wiring is small, and a method for manufacturing the same. In order to achieve this object, in the surface-treated electro-deposited copper foil, the maximum waviness height (Wmax) of the bonding surface to be bonded with an insulation layer-constituting material to be 0.05 μm to 0.7 μm, the maximum peak to valley height (PV) to be 0.05 to 1.5 μm, and the surface roughness (Rzjis) to be 0.1 μm to 1.0 μm. The electro-deposited copper foil used for the manufacturing of this surface-treated electro-deposited copper foil is manufactured by using a sulfuric acid base copper electrolytic solution obtained by adding 3-mercapto-1-propanesulfonic acid or bis(3-sulfopropyl)disulfide, a quaternary ammonium salt polymer having a cyclic structure, and chlorine, and using a cathode having small surface roughness, under electrolysis conditions of carrying out continuous first-step electrolysis to n-th-step electrolysis at two or more different levels of electric current density.
Owner:MITSUI MINING & SMELTING CO LTD

Isolated bidirectional DC-DC converter realized by coupling inductor

The invention discloses an isolated bidirectional DC-DC (direct current) converter realized by a coupling inductor, which comprises four power switch tubes with reverse parallel diodes and parallel capacitors, two auxiliary switch tubes with reverse parallel diodes, two clamping capacitors, a switch capacitor and two two-winding coupling inductors. The invention reduces the ripples of the low-voltage side current through the low-voltage side parallel structure, realizes the zero voltage shutoff of the power switch tubes through the parallel capacitors on the power switch tubes, realizes the zero voltage conduction of the power switch tubes through the leakage inductance of the coupling inductors, realizes lossless transfer of the leakage inductance energy through the auxiliary switch tubes and an active clamping circuit consisting of the reverse parallel diodes of the auxiliary switch tubes and the clamping capacitors, and increases/decreases the voltage of the converter through the serial structure of the high-voltage side windings of the two coupling inductors. The circuit has simple structure, all power switches work in a soft switch state, no energy consumption element is arranged in the circuit, and the converter efficiency is improved; and moreover, during the current conversion, the switch device does not experience voltage overshoot.
Owner:HOYMILES POWER ELECTRONICS INC

CPT (contact-less power transfer) system based on static capacitor array and control method thereof

The invention discloses a CPT (contact-less power transfer) system based on a static capacitor array and a control method thereof, and belongs to the field of CPT system. In the CPT system, the static capacitor array is additionally arranged on a pick-up end circuit; a resonant inductor Ls on the pick-up end circuit is connected with the static capacitor array in parallel; two ends of load RL areconnected with an input terminal of an AD (analog-to-digital) sampling module through a voltage division circuit; an output terminal of the AD sampling module is connected with an input terminal of acontroller; and an output terminal of the controller is connected with the static capacitor array so as to control the static capacitor array to output different equivalent capacitance values. In thecontrol method of the CPT system, a segmented control method based on a soft-switching technology is provided for adjusting the equivalent capacitance values output by the static capacitor array in alogical operation manner, thereby realizing control of output voltage of the CPT system. The CPT system and the control method thereof have the advantages that the adjustment range of the output voltage of the CPT system is extended, the loss of a dynamic switch is reduced and the overall stability of the system is improved.
Owner:重庆艾普特电气有限公司

Staggered parallel flyback LED driving power supply and PFM (pulse width modulation) control circuit thereof

The invention discloses a staggered parallel flyback LED driving power supply and a PFM (pulse width modulation) control circuit thereof. A main circuit of the driving power supply is formed by staggering and parallel connection of two flyback converters, and comprises an alternating-current input end, an EMI (electromagnetic interference) filter, a bridge rectifier, the two parallel flyback converters, an output rectifier and an LED load. By the aid of the staggered parallel main circuit structure, current stress of switching tubes is reduced, input and output current ripple is reduced, the EMI filter design is simplified, power level of the driving power supply is increased, and the like. A PFM control method is adopted in the control circuit of the driving power supply; compared with a common PWM control method, the PFM control method has the advantages that by the aid of the PFM control circuit, the driving power supply can change in switching tube turning-on time and switching frequency simultaneously when the load changes, working loss during light load of the driving power supply is reduced, and power supply efficiency is improved. The driving power supply is suitable for applications of an LED driving power supply with an automatic dimming function.
Owner:JIANGSU UNIV

Control method of two-way direct current conversion device

The invention discloses a control method of a two-way direct current conversion device. The control method of the two-way direct current conversion device is suitable for high voltage and high power conversion sites, and can support frequent changing-over of power flow direction. Switching loss and circuit complexity can be balanced. At first an upper switch tube breakover time T 1 and a lower switch tube breakover time T 2 in a control cycle T s are calculated according to required pulse width modulation (PWM) control signal duty ratio D, and the ratio of T 1 to TS is D. In the process of practical control, one main circuit in the two-way direct current conversion device can be used as a reference subcircuit. The control on the reference subcircuit is that the upper switch tube and the lower switch tube in the reference subcircuit are controlled to be communicated in a complementary mode in each control circuit T s, and every time the upper switch tube and the lower switch tube are changed over, the dead time delta is added to carry out transition. Therefore the real breakover time of the upper switch tube is that T 1 subtracts the delta, and the real breakover time of the lower switch tube is that the T 2 subtracts the delta. The control on an un-referenced subcircuit is that control signals of all un-referenced subcircuits are the same, and differ by 180 degrees from the control signals of the reference circuit.
Owner:BEIJING POWER MACHINERY INST

Constant current source system for average current mode control, and control method thereof

The invention discloses a constant current source system for average current mode control, and a control method thereof. The constant current source system comprises an inductor L1 and a sampling resistor RCS which are connected in series with an external connection load, a freewheeling diode D1 which is connected in parallel with the load, the inductor L1 and the sampling resistor RCS, and a power switch which is used for controlling charging and discharging states of the inductor. The constant current source system further comprises an error amplifier, a loop compensation unit, a first voltage current converter, an oscillator, a PWM modulation unit, a latch trigger unit, a driving unit, a first resistor R1 which is connected with the positive input end of the error amplifier and a reference source, and a second resistor R2 which is connected with the negative input end of the error amplifier and one end of the sampling circuit. According to the constant current source system for the average current mode control, and the control method thereof, brought forward by the invention, the output current precision of a constant current source system can be improved, at the same time, the work frequency is fixed, and the design of the constant current source system can be simplified.
Owner:佛山市南海赛威科技技术有限公司
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