6 results about "Zeta converter" patented technology

The invention belongs to the technical field of power systems, and discloses a hybrid renewable energy system, a control method and a charging system.The hybrid renewable energy system comprises a bidirectional Zeta converter, an inverter, a photovoltaic power source and a wind power source; the bidirectional Zeta converter comprises a first switch tube, a second switch tube, a first capacitor, a second capacitor, a third capacitor, a filter capacitor, a first inductor, a second inductor and a diode. The inverter comprises an inverter first switch tube, an inverter second switch tube, an inverter third switch tube, an inverter fourth switch tube, an inverter fifth switch tube and an inverter sixth switch tube; the source electrode of the fifth switch tube of the inverter is connected with the drain electrode of the sixth switch tube of the inverter; and the inverter is connected with a power grid. According to the invention, the efficiency of the photovoltaic system is obviously improved, so that photovoltaic and wind power generation systems are integrated into a power grid, and continuous and reliable power supply is provided for charging of the electric vehicle.

The application discloses a series battery pack active equalization circuit based on a Zeta converter, which comprises an n-way output Zeta converter, n cross connection capacitors and n battery units; the n-way output Zeta converter comprises an inductor L, a power switch S and a first-way output diode D1, a first-way output capacitor C1, a first-way cross connection capacitor C p1 , a first-way clamping diode D p1 ; a second-way output diode D2, a second-way output capacitor C2, a second-way cross connection capacitor C p2 , a second-way clamping diode D p2 ; a third-way output diode D3, a third-way output capacitor C3, a third-way cross connection capacitor C p3 , a third-way clamping diode D p3 ; and a fourth-way output diode D n , a fourth-way output capacitor C n , a fourth-way cross connection capacitor C pn , a fourth-way clamping diode D pn . The application realizes automatic voltage equalization among the battery units through the cross connection capacitors, does not need complex sampling and control algorithms, avoids the end voltage imbalance problem caused by the cross regulation ratio of a transformer in a multi-winding output, effectively reduces voltage deviation and improves battery equalization precision.

A three-level zeta asymmetrical half-bridge for converting a DC input voltage into a DC output voltage comprising an asymmetrical half-bridge, a resonant tank and a zeta converter.

The invention relates to the technical field of battery pack management, in particular to a lithium battery pack charging equalization circuit, which comprises a basic Zeta converter, n-1 interstage capacitors CVB, n-1 output expansion units and n lithium ion batteries, and is characterized in that the basic Zeta converter comprises an inductor L1, an inductor Lin, a capacitor C1, a capacitor Ci1, a switch S1 and a diode D1; each output expansion unit is composed of an inductor L2, a capacitor C2, a capacitor Ci2 and a diode D2, the n-1 inter-stage capacitors CVB and the output expansion units are installed in a one-to-one correspondence mode, the two ends of one inter-stage capacitor CVB are connected with the capacitor Ci1 and the capacitor Ci2 respectively, and the two ends of the remaining n inter-stage capacitors CVB are connected with the capacitors Ci2 in the two adjacent output expansion units. According to the invention, voltage sharing among the battery units is realized through the inter-stage capacitors, complicated sampling and control algorithms are not needed, the voltage deviation is effectively reduced, the battery equalization precision is improved, equalization of the battery pack is realized through the switch, and the control difficulty and cost of the circuit are reduced.

The invention discloses a series battery pack active equalization circuit based on a Zeta converter. The equalization circuit comprises an n-path output zeta converter, n bridging capacitors and n battery units, the n-path output zeta converter comprises an inductor L, a power switch S, a first-path output diode D1, a first-path output capacitor C1, a first-path bridging capacitor Cp1 and a first-path clamping diode Dp1, a second path of output diode D2, a second path of output capacitor C2, a second path of bridging capacitor Cp2 and a second path of clamping diode Dp2; a third-path output diode D3, a third-path output capacitor C3, a third-path bridging capacitor Cp3 and a third-path clamping diode Dp3; and the like, an nth output diode Dn, an nth output capacitor Cn, an nth bridging capacitor Cpn and an nth clamping diode Dpn. According to the invention, automatic voltage sharing among the battery units is realized through the bridging capacitor, no complex sampling and control algorithm is needed, the problem of terminal voltage imbalance caused by cross adjustment rate during multi-winding output of the transformer is avoided, the voltage deviation is effectively reduced, and the battery equalization precision is improved.

A Zeta converter-based lithium ion battery SOC active equalization circuit comprises an n-path output Zeta converter, n-1 bridging capacitors and n lithium ion batteries, and the n-path output Zeta converter comprises a direct current input source uin, a power switch S1, an input inductor Lm, an input capacitor Cm, a first-path output diode D1, an output inductor L1 and an output capacitor C1; the first path of output diode D1, the second path of output diode D2, the output inductor L2 and the output capacitor C2, the third path of output diode D3, the output inductor L3, the output capacitor C3,..., and the like, and the nth path of output diode Dn, the output inductor Ln and the output capacitor Cn. The equalization circuit comprises an n-path output Zeta converter, n-1 bridging capacitors and n lithium ion batteries, and output consistency is realized by adding one bridging capacitor between each path. Compared with a traditional multi-path series equalization structure, automatic voltage equalization between the battery units is achieved through the bridging capacitors, complex sampling and control algorithms are not needed, voltage deviation is effectively reduced, and the battery equalization precision is improved.