34results about How to "Reduce capacitor size" patented technology

Methods and circuits for power supply arrangement and control are disclosed herein. In one embodiment, a power supply can include: (i) an input capacitor coupled to an input terminal that is coupled to a power source, where the power source provides power that is constrained by a predetermined limit; (ii) an output capacitor coupled to an output terminal that is coupled to a load, where the load has a first load condition or a second load condition; (iii) a first regulator to convert an input voltage at the input terminal to an output voltage at the output terminal to power the load; (iv) a second regulator coupled to the first regulator; and (v) an energy storage element coupled to the second regulator, where the second regulator delivers energy from the energy storage element to the first regulator to maintain regulation of an output voltage at the output terminal when in the second load condition.

The invention relates to a line loss compensation circuit for a switch power supply, which is divided into a current-type line loss compensation circuit and a voltage-type line loss compensation circuit, wherein the current-type circuit comprises a multi-stage RC low pass filter, a voltage / current switching circuit and a current mirroring circuit, and the voltage-type circuit comprises a multi-stage RC low pass filter, a subtractor and a compensating resistance. The invention can produce a compensating current of Icpr or a compensating voltage of Vcpr which is proportionable to an output current of Iout, and the compensating current or the compensating voltage is used for offsetting voltage drop of an output wire caused by change of Iout, thereby recovering voltage stabilizing control function of a control loop to secure constant output. The invention has the advantages of skilful design idea and simple circuit and is easy to realize. The improvement of the invention is that: the switch RC filter is adopted to greatly reduce volume of an electric capacity of the RC filter, thereby facilitating integration, further improving circuit performance and simplifying circuit structure, and strengthening operation reliability of the switch power supply.

The invention relates to the technical field of the preparation of aluminum foil, in particular to a preparation method of a low-voltage anode foil for electrolytic capacitors. The extended-surface corrosion for the aluminum foil is carried out by multiple frequency conversion electric corrosion, so the invention has the characteristics of high production efficiency, stable technology, easy elimination of technology fault; the capacitance of the products is 10 percent higher than that of domestic products universally eroded by 50 Hz AC, and the aluminum foil has high use efficiency and high strength under the same corrosion weight loss condition.

The invention discloses a protective circuit for switching over-voltage protection of a dry air reactor, relates to an over-voltage protective circuit for the dry air reactor, and solves the following problems in the traditional reactor over-voltage protection: the capacitance volume is large and the production cost is high when a resistance-capacitance absorption circuit is singly used, and dispersibility of gap breakdown voltage is increased and service life of protective gap is reduced due to frequent actions of the protective gap when a gap protector is singly used. The protective circuit can be satisfied through choosing proper element parameters according to cut-off current; when the cut-off current is lower, a resistance-capacitance absorption device controls over-voltage amplitude values at two ends of the reactor to prevent the over-voltage amplitude values from reaching the breakdown voltage of the protective gap, the protective gap is in a disconnection state, and the reactor and respective resistance-capacitance elements form an RLC (Radio Link Control) oscillation circuit; when the cut-off current is higher, the over-voltage amplitude values at two ends of the reactor are higher, the protective gap is broken down, and a capacitor and a protective resistor thereof are short out; the protective circuit for the switching over-voltage protection of the dry air reactor is applied to the reactor protection field.

The invention relates to the field of power electronics, in particular to a multi-stage single switch boost converter which is composed of a Boost circuit and a plurality of Switch-Capacitor networks. Voltages supplied by all the Switch-Capacitor networks are equal. Accumulation of the network voltages is achieved in an interleaving series connection mode, an output voltage is boosted, and the capacity of boosting is high. The converter is provided with only one active switch element, a control circuit is simple, and voltage stress of a switching tube is small and 1 / (1-D) times that of an input voltage. Capacitor voltages of all the Switch-Capacitor networks are equal and 1 / (1-D) times that of the input voltage, stress of the capacitor voltages is small, therefore, the size of the circuit is reduced, and integration is easy.

The invention discloses a power electronic transformer based on a hybrid modular multilevel converter, which belongs to the technical field of power generation, transformation or distribution. A power electronic transformer includes an input stage, a transmission stage and an output stage. The transmission stage is an input parallel and output series structure of multiple DC / DC power units. The low-voltage side is connected in parallel to the low-voltage DC bus of the power electronic transformer system, and the high-voltage side is connected in series through a bypass circuit to connect to the high-voltage DC bus of the power electronic transformer system. According to the real-time power transmission of the power electronic transformer system, the number of DC / DC power units in series is changed through the bypass circuit of the transmission stage to realize the active adjustment of the high-voltage DC bus voltage. The modular multilevel converter of the output stage is a hybrid Modular structure for overshoot operation of the output stage. The invention can reduce the volume and weight of the power electronic transformer system, improve the power transmission efficiency and improve the system reliability.

The present invention discloses a full-wave active rectification LLC resonant converter and a control policy thereof, belonging to the technical field of power electronic converters. The input source,an input bus capacitor, a primary side switching network, a resonance inductor, a resonance capacitor, a transformer, n (>=1) secondary side full-wave active rectification switching networks, m (>=0)secondary side full-wave rectification switching networks, an output filtering capacitor and an output load; when an input voltage is close to a rated working point, a secondary side assistant activeswitch tube maintains closure, and a convertor employs frequency conversion control; when an input voltage drops, the duty ratio of the secondary side assistant active switch is regulated to maintainthe stable output voltage; and the full-wave active rectification LLC resonant converter can meet two demands of the power system for the steady-state working point efficiency and the transient voltage drop, and is specially suitable for application occasions where the power system is required to have a power-down maintenance capacity such as a server power source and a rail traffic power source.

Embodiments of the present disclosure relate to the technical field of integrated circuits, and in particular, relate to a DAC capacitor array, an analog-to-digital converter, and a method for reducing power consumption of an analog-to-digital converter. The DAC capacitor array includes a plurality of sub-capacitor arrays that are connected in parallel. Each sub-capacitor array includes: a capacitor group, including N capacitors connected in parallel, N being a positive integer; and a primary switch and a plurality of multiplexers; wherein one terminal of each capacitor in the capacitor group is connected to an input terminal of a comparator, and is connected to an input source via the primary switch; and the other terminals of the capacitors in the capacitor group are connected to a plurality of input sources via corresponding multiplexers respectively. The DAC capacitor array is optimized by adjusting the reference voltage to which the capacitors in the DAC capacitor array are connected, which reduces the overall capacitance of the DAC capacitor array. In this way, the size of the SAR analog-to-digital converter is reduced, the power consumption is reduced, and meanwhile the cost of chips may be lowered in manufacture of the chips.

The invention discloses a boost-type series-parallel full-resonance switched capacitor converter. The boost-type series-parallel full-resonance switched capacitor converter comprises a first one-way switch, a second one-way switch, a third one-way switch, a fourth one-way switch, a first switch tube, a second switch tube, a third switch tube, a first resonant capacitor, a second resonant capacitor, a first resonant inductor and a second resonant inductor. The boost-type series-parallel full-resonance switched capacitor converter provided by the invention realizes resonance of all bypass capacitors, and the charging and discharging processes of all the bypass capacitors in the resonance state are soft charging / discharging, so that the transient state current peak is low, and the volume of the capacitor is small. Meanwhile, time of overlapping of the first resonance current resonance rising stage and the second resonance current linear descending stage is adjusted, and the output voltagecan be adjusted, so that the purpose of wide-range linear continuous voltage regulation is achieved.

The invention relates to the technical field of solid-state transformers for medium and low voltage hybrid AC and DC networking, in particular to a CHB-SST topology with high-frequency chain interconnection and a control method thereof, including: a full-bridge and capacitor structure, a high-frequency link with a full-bridge structure, and a full-bridge structure With the four active bridge converter structure and the three-phase bridge arm of the high-frequency link, the high-frequency link of the full-bridge structure and the full-bridge and capacitor structure form an isolation sub-module, and the high-frequency link of the full-bridge structure interconnects all the isolation sub-modules Together, the output ends of the full-bridge structure and the four-active bridge converter structure of the high-frequency link are connected in parallel to form a low-voltage DC bus, and each of the three-phase bridge arms includes: n Isolation sub-modules and bridge arm inductors L a , L b , L c ; The present invention eliminates the SM capacitor voltage ripple.