CN202696172U

CN202696172U - Improved inverter for battery discharge of electric automobile

Info

Publication number: CN202696172U
Application number: CN 201220124493
Authority: CN
Inventors: 李剑铎
Original assignee: GLOBAL MAINSTREAM DYNAMIC ENERGY TECHNOLOGY Ltd
Current assignee: GLOBAL MAINSTREAM DYNAMIC ENERGY TECHNOLOGY Ltd
Priority date: 2012-03-29
Filing date: 2012-03-29
Publication date: 2013-01-23
Anticipated expiration: 2022-03-29

Abstract

The utility model discloses an improved inverter for battery discharge of an electric automobile. A DC-DC module (2), a DC-AC module (3), an output module (4) and a controller (5) are mounted on a battery inverter (6), i.e., the controller (5) is simultaneously connected with the DC-DC module (2), the DC-AC module (3), and the output module (4), wherein the DC-DC module (2) serves as a preceding circuit, and the DC-AC module (3) is provided with a neutral-point-clamped three-phase three-level DC-AC inverter. By changing resistive loads in a discharge loop into a special inverting system for battery discharge, excess energy of a battery can be fed back to a power grid so that the electric energy loss is reduced, the power consumption is effectively decreased, the working state is kept stable, and the improved inverter is economical, energy-saving, reliable, and durable in property.

Description

The improvement inverter of batteries of electric automobile discharge

Technical field

The utility model relates to electric automobile and discharges and recharges the servicing unit technical field, especially the improvement inverter of batteries of electric automobile discharge.

Background technology

At present, along with the progressively industrialization of electric automobile, correlation technique is rapidly developed, and comprises battery such as the core technology of generally acknowledging, and the technology that discharges and recharges obtains paying close attention to more, and meanwhile, the maintenance of batteries of electric automobile is subject to increasing attention.In existing battery maintenance system, single standard automobile battery can directly be received a charger and finish charging work, and the discharge of battery usually all by and connect a pure resistance and realize, when battery need to discharge in some cases, the switch of receiving ohmic load will be incorporated into, and the excess energy of battery will directly consume on resistance.As seen, existing way will cause great waste undoubtedly.

Summary of the invention

Goal of the invention of the present utility model is to provide a kind of improvement inverter of batteries of electric automobile discharge, and the batteries of electric automobile of using this device electric energy of can will having more than needed when discharge feeds back electrical network, to reduce waste of energy, reduces the electric automobile application cost.

Realize that goal of the invention measure of the present utility model is: DC-DC module, DC-AC module, output module and controller are installed on the battery inverter, be that controller connects DC-DC module, DC-AC module and output module simultaneously, wherein, the DC-DC module goes up mounting points clamper type three-phase tri-level DC-AC inverter as front stage circuits in the DC-AC module.

The utility model has the advantage of, by the ohmic load in the discharge loop being changed specially into the inversion system for battery discharge, the excess energy of battery is fed back in the electrical network, to reduce electric energy loss, effectively reduce power consumption, in stable condition during work, the performance economical and energy saving is reliability and durability.

Description of drawings

Fig. 1 is structural representation of the present utility model.

Fig. 2 is that the utility model is connected the application structure schematic diagram with battery.

Fig. 3 is the crisscross parallel Boost configuration diagram in the DC-DC module in the utility model.

Fig. 4 is the neutral-point-clamped type three-level inverter schematic diagram in the DC-AC module in the utility model.

Reference numeral comprises:

Battery 1, DC-DC module 2, DC-AC module 3, output module 4, controller 5, battery inverter 6, charger 7, electrical network 8.

Embodiment

Further specify by the following examples.

Embodiment 1:

DC-DC module 2, DC-AC module 3, output module 4 and controller 5 are installed on the battery inverter 6, be that controller 5 connects DC-DC module 2, DC-AC module 3 and output module 4 simultaneously, wherein, DC-DC module 2 goes up mounting points clamper type three-phase tri-level DC-AC inverter as front stage circuits in the DC-AC module 3.

DC-DC module 2 comprises crisscross parallel Boost topological structure.Simultaneously, DC-DC module 2 comprises ZVT Zero-voltage soft alteration switch structure.

Battery inverter 6 power main circuits employing DC-DC module 2 and DC-AC module 3 Two Stages, transless isolated topology structure.

DC-AC module 3 circuit adopt three Level Full Bridge structures of space vector modulation.

DC-AC module 3 comprises neutral-point-clamped type three-level inverter topology (NPC-Three Level Inverter).This framework has the advantages such as output voltage ripple is little, and the voltage stress that power device bears is little.Can improve the output voltage waveforms quality, reduce inductor loss, raise the efficiency.

Simultaneously, DC-AC module 3 comprises IGBT and the metal-oxide-semiconductor of parallel running, the 3 process 26S Proteasome Structure and Function optimizations of DC-AC module, but the little switching loss of conduction loss of IGBT is large, and the little characteristics of the large switching loss of the conduction loss of metal-oxide-semiconductor combine, and have greatly improved conversion efficiency.Adopt simultaneously the modulation system based on the space vector modulation of instantaneous reactive power theory on the control system, namely can improve the DC bus-bar voltage utilance and also can reduce switching loss.

Three-phase inverter in the DC-AC module 3 has the advantages such as power density height, three phase power equilibrium with respect to three single-phase inverters.

Aforementioned, output module 4 output filters adopt single induction structure.Especially, output module 4 is equipped with double relay, by different CPU control, guarantees the system safety reliability service respectively; Satisfy the requirement of being incorporated into the power networks of up-to-date international standard.

DSP master controller and MCU pilot controller are installed on the controller 5.

The utility model accesses charger 7 when using from electrical network 8, and then from charger 7 access batteries 1; Wherein, battery 1 can select 5 to be serially connected in battery pack, and this is the charging connection status: simultaneously, connect battery inverter 6 at 7 batteries of charger 1, connect electrical network 8 from battery inverter 6 again; When battery 1 needs discharge, carried out by the controller 5 on the battery inverter 6 and to turn-off 7 batteries of chargers 1 and connect, start simultaneously battery inverter 6 and enter operating state, battery 1 is to electrical network 8 feedback that is incorporated into the power networks.

In the utility model, the purpose that is incorporated into the power networks and discharges for reaching battery, consider that the batteries of electric automobile output voltage is lower, battery inverter 6 power main circuits adopt Two Stages, transless isolated topology, the preceding stage DC-DC circuit adopts crisscross parallel Boost topological structure, and the voltage that battery 1 is inputted rises to the busbar voltage that is suitable for inversion; Rear class DC-AC module 3 circuit adopt three Level Full Bridge structures of space vector modulation (SVPWM), and direct current is transformed into alternating current; Forward and backward level is connected by bus capacitor.Output module 4 output filters adopted single induction structure when system was incorporated into the power networks.

In the utility model, DC-DC module 2 is crisscross parallel Boost framework, and this framework can significantly reduce the ripple current in the bus capacitor, thereby prolongs the entire system life-span; Simultaneously, DC-DC module 2 adopts ZVT Zero-voltage soft switch converter technique to improve operational efficiency.

In the utility model, controller 5 adopts DSP and the design of MCU double CPU for redundant, adopts simultaneously digital control technology and simulates protecting circuit designed, and both can improve system's operational flexibility has and can increase security and stability.

The utility model is realized the no-voltage conducting of switching tube, and the switching tube electric current reduces with voltage stress, raising device useful life; Reduce the switching loss of switching tube and the anti-phase recovery loss of diode.

The utility model possesses self detecting function, that is:

1), electric circuit inspection: must carry out self check to inner testing circuit before inversion module is incorporated into the power networks, comprise the output current sensor.

2), controller detects: whether the communication function that inversion module must detect between two controllers in real time is unusual.

The utility model also possesses defencive function, and is concrete, is divided three classes according to the event order of severity: warn (Warning), can recover fault (Fault) and unrecoverable failure (Permanent Fault).Mainly contain DC over-voltage protection, direct current under-voltage protection, direct current overcurrent protection, interchange overvoltage protection, AC undervoltage protection, AC overcurrent protection, short-circuit protection, testing circuit abnormal protection, overheat protector, fan detecting protection etc.Under controller 5 work, for the different fault verification of the order of severity and carry out different protected modes.Belong to warning such as the fan stall, when fault occured, system can send warning, but continued to keep original state; And the AC overtension belongs to and can recover fault, and when fault occured, system changed malfunction over to, automatically changes running status over to after waiting trouble shooting; The fault that greatly exceeds set point when the alternating current instantaneous variation belongs to unrecoverable failure, and when this fault occured, system is shutdown directly, needs manual operation to remove fault.

After the utility model is used, the energy of wasting in the primary cell maintenance process will directly be converted to alternating current and be input in the electrical network, can be enterprise and directly utilize the minimizing power consumption, bring more long-term economic benefit.

In above embodiment, do not reach the employing prior aries such as other necessary technologies that relate to enforcement of narration, enumerate no longer successively detailed description.

Claims

1. the improvement inverter of batteries of electric automobile discharge, it is characterized in that: upper DC-DC module (2), DC-AC module (3), output module (4) and the controller (5) installed of battery inverter (6), be that controller (5) connects DC-DC module (2), DC-AC module (3) and output module (4) simultaneously, wherein, DC-DC module (2) goes up mounting points clamper type three-phase tri-level DC-AC inverter as front stage circuits in the DC-AC module (3).

2. the improvement inverter of batteries of electric automobile discharge as claimed in claim 1 is characterized in that DC-DC module (2) comprises crisscross parallel Boost topological structure, and simultaneously, DC-DC module (2) comprises ZVT Zero-voltage soft alteration switch structure.

3. the improvement inverter of batteries of electric automobile discharge as claimed in claim 1 is characterized in that, battery inverter (6) power main circuit employing DC-DC module (2) and DC-AC module (3) Two Stages, transless isolated topology structure.

4. the improvement inverter of batteries of electric automobile discharge as claimed in claim 1 is characterized in that DC-AC module (3) comprises neutral-point-clamped type three-level inverter topology.

5. the improvement inverter of batteries of electric automobile discharge as claimed in claim 1 is characterized in that DC-AC module (3) comprises IGBT and the metal-oxide-semiconductor of parallel running.

6. the improvement inverter of batteries of electric automobile discharge as claimed in claim 1 is characterized in that output module (4) output filter adopts single induction structure.

7. the improvement inverter of batteries of electric automobile discharge as claimed in claim 1 is characterized in that, output module (4) is equipped with double relay, is controlled by different CPU respectively.

8. the improvement inverter of batteries of electric automobile discharge as claimed in claim 1 is characterized in that, upper DSP master controller and the MCU pilot controller installed of controller (5).