CN206697990U

CN206697990U - A kind of charge-discharge circuit based on half-bridge structure

Info

Publication number: CN206697990U
Application number: CN201720492754.2U
Authority: CN
Inventors: 徐利东; 闵卫丰
Original assignee: JIANGSU JINFAN POWER TECHNOLOGY Co Ltd
Current assignee: JIANGSU JINFAN POWER TECHNOLOGY Co Ltd
Priority date: 2017-05-05
Filing date: 2017-05-05
Publication date: 2017-12-01
Anticipated expiration: 2027-05-05

Abstract

The utility model discloses a kind of charge-discharge circuit based on half-bridge structure for the working condition for improving IGBT module, bus filter circuit and reactor, its structure includes：The two-way inverters of AC/DC, bus filter circuit and at least three tunnels charge/discharge unit parallel with one another, for this at least three road charge/discharge unit the PWM misphase drive circuits mutually to stagger at phase angle are provided, included per road charge/discharge unit：First IGBT module and the second IGBT module, the colelctor electrode of first IGBT module is connected with the direct-flow positive pole of described AC/DC bidirectional active inverter circuits, the emitter stage of first IGBT module is connected with the colelctor electrode of the second IGBT module, and the emitter stage of the second IGBT module is connected with the direct current negative pole of the two-way inverters of AC/DC；The output end of charge/discharge unit is serially connected with after the reactor to match and connect respectively.The charge-discharge circuit is mainly used in the discharge and recharge of battery.

Description

A kind of charge-discharge circuit based on half-bridge structure

Technical field

The utility model is related to a kind of charge-discharge circuit, more particularly to it is a kind of based on half-bridge structure to battery Carry out the circuit of discharge and recharge.

Background technology

As shown in figure 3, traditional charge-discharge circuit based on half-bridge structure, its structure include：The two-way inversions of AC/DC Device, bus electrolytic capacitor filter, 150A/600V IGBT module form single group charge-discharge circuit and with single group discharge and recharge electricity The corresponding single group PWM triggers circuits in road, single 40A reactor and single 40A/75mV current divider.Actually using Cheng Zhong, due to being controlled using single group PWM, its bus electrolytic capacitor filter is under abnormal operating state for a long time, is easily made Situations such as into leakage, voltage breakdown, condenser failure；Moreover, single group IGBT module subjects larger rush of current, if voltage Peak absorbing capacitive property is decayed, and be may result in IGBT module and is operated in extremity, radiates also by leading with its radiating surface Hot fat aging and become abnormal difficult；It is well known that reactor must design according to current specification, the body of 40 amperes of reactor Product is very huge, causes to perplex to structure design；In addition, for sampling single current divider because its output ripple electric current compared with Greatly so that it generates heat than more serious, so as to produce temperature drift, has influence on its sampling precision.

Utility model content

Technical problem to be solved in the utility model is：There is provided one kind can improve IGBT module, bus filter circuit and The charge-discharge circuit based on half-bridge structure of the working condition of reactor.

In order to solve the above technical problems, the technical solution adopted in the utility model is：A kind of charge and discharge based on half-bridge structure Circuit, including：The two-way inverters of AC/DC and the bus filtered electrical being connected in parallel on the DC output end of the two-way inverters of AC/DC Road, at least three tunnels charge/discharge unit parallel with one another and provide phase angle for this at least three road charge/discharge unit and mutually stagger PWM misphase drive circuits, each charge/discharge unit includes：First IGBT units and the 2nd IGBT units, the first IGBT are mono- The colelctor electrode of member is connected with the direct-flow positive pole of the two-way inverters of the AC/DC, the emitter stage and the 2nd IGBT of the first IGBT units The colelctor electrode of unit is connected, the output end as the charge/discharge unit, emitter stage and the two-way inversions of AC/DC of the 2nd IGBT units The direct current negative pole of device is connected, the earth terminal as the charge/discharge unit；The output end of charge/discharge unit is serially connected with respectively to match Reactor after and connect, the output end as the charge/discharge unit, the first all IGBT units and the 2nd IGBT units Base stage is connected with the corresponding output end of the PWM misphases drive circuit.

As a kind of preferred scheme, in a kind of described charge-discharge circuit based on half-bridge structure, the discharge and recharge list Current divider is also serially connected between the output end of member and the output end of charge-discharge circuit.

As a kind of preferred scheme, in a kind of described charge-discharge circuit based on half-bridge structure, described IGBT is mono- Member is IGBT module.

As a kind of preferred scheme, in a kind of described charge-discharge circuit based on half-bridge structure, described IGBT is mono- Member is formed in parallel by least two IGBT single tubes.

As a kind of preferred scheme, in a kind of described charge-discharge circuit based on half-bridge structure, the filter of described bus Wave circuit is formed in parallel by least two capacity identical electrochemical capacitors.

The utility model also provides a kind of charging/discharging thereof based on half-bridge structure, and the process employs N roads discharge and recharge electricity Road carries out continuous relay charge or discharge in a manner of PWM misphases, and N >=3, it is concretely comprised the following steps：By each PWM cycle N deciles, make In N number of 1/N cycles of each PWM cycle, this N road charge-discharge circuit Dui Fu carry out charge or discharge relay, so follow Ring is reciprocal.

The beneficial effects of the utility model are：According to charging/discharging thereof described in the utility model design based on half-bridge knot The charge-discharge circuit of structure, employ the PWM misphase drive circuits mutually to stagger at phase angle so that in the course of the work, not only drop The low influence to the two-way inverters of AC/DC and the impact to filter capacitor on dc bus, moreover, also substantially reducing output The ripple amplitude of electric current, so as to extend the life-span of filtering electrochemical capacitor, the precision of output current is improved, reduced to negative The performance impact of (battery) and interference to equipment itself are carried, materially increases the stability of equipment and reliable Property.

Brief description of the drawings

Fig. 1 is a kind of theory structure schematic diagram of charge-discharge circuit described in the utility model.

Fig. 2 is the theory structure schematic diagram of another charge-discharge circuit described in the utility model.

Fig. 3 is the theory structure schematic diagram of charge-discharge circuit described in background technology.

Fig. 4 is the ripple characteristics comparison diagram of charge-discharge circuit described in the utility model and traditional structure.

Fig. 5 is the schematic equivalent circuit of in parallel with IGBT single tubes group of IGBT module.

Embodiment

Below in conjunction with the accompanying drawings, a kind of charge-discharge circuit and side based on half-bridge structure described in the utility model is described in detail The specific embodiment of method.

As shown in figure 1, the charge-discharge circuit based on half-bridge structure of (single-chip microcomputer) is driven using misphase in piece, bag Include：The two-way inverters of AC/DC, the bus filter circuit being connected in parallel on the DC output end of the two-way inverters of AC/DC and four tunnels (way of charge/discharge unit can also be three tunnels or five tunnels to charge/discharge unit parallel with one another depending on actual conditions It is even more more) and the road charge/discharge units of Wei Zhe tetra- provide the PWM misphases drive circuit mutually to stagger at phase angle (due to being four tunnels Misphase exports, 90 degree of the carrier phase shift being sequentially output), described bus filter circuit is generally identical, pressure-resistant by multiple capacity Also the electrochemical capacitor of identical (7 having been drawn in figure, i.e. C1 to C7) is formed in parallel, and each charge/discharge unit includes：First IGBT Unit and the 2nd IGBT units, wherein, first via charge/discharge unit includes：First IGBT units Qa1 and the 2nd IGBT units Qa2, the second road charge/discharge unit include：First IGBT units Qb1 and the 2nd IGBT unit Qb2, the 3rd road charge/discharge unit bag Include：First IGBT units Qc1 and the 2nd IGBT unit Qc2, the 4th road charge/discharge unit include：First IGBT units Qd1 and Two IGBT units Qd2；The colelctor electrode of the first IGBT units Qa1, Qb1, Qc1 and Qd1 in four tunnels and the two-way inversions of the AC/DC The direct-flow positive pole of device, the first IGBT units Qa1 emitter stage are connected, as the first via with the 2nd IGBT units Qa2 colelctor electrode The output end of charge/discharge unit, the first IGBT units Qb1 emitter stage is connected with the 2nd IGBT units Qb2 colelctor electrode, conduct The output end of second road charge/discharge unit, the colelctor electrode phase of the first IGBT units Qc1 emitter stage and the 2nd IGBT units Qc2 Even, the output end as the 3rd road charge/discharge unit, the first IGBT units Qd1 emitter stage and the 2nd IGBT units Qd2 collection Electrode is connected, the output end as the 4th road charge/discharge unit, the 2nd IGBT units Qa2, Qb2, Qc2 and Qd2's in four tunnels Emitter stage is connected with the direct current negative pole of the two-way inverters of the AC/DC, the earth terminal as the charge/discharge unit；First to fourth After the output end of charge/discharge unit is serially connected with reactor La, Lb, Lc and the Ld and current divider Fa, Fb, Fc and Fd to match respectively And connect, the output end as whole charge-discharge circuit is connected with as the positive pole of battery of load, the first all IGBT is mono- Member and the 2nd IGBT units base stage be the first IGBT units Qa1, Qb1, Qc1 and Qd1 and the 2nd IGBT units Qa2, Qb2, Qc2 and Qd2 base stage is connected with the corresponding output end of the PWM misphases drive circuit.

Certainly, as shown in Fig. 2 the charge-discharge circuit described in the utility model based on half-bridge structure can also use it is multiple Single-chip microcomputer controls the operation of whole circuit.

In practical application, described C1 to C7 has selected 220uF/450V electrochemical capacitor, each IGBT units are by 4 40A/600V IGBT single tubes are formed in parallel -- and shown in Figure 5, certainly, each IGBT units can also be by an IGBT mould Block is formed, and described La, Lb, Lc, Ld have selected 10A reactor, and described Fa, Fb, Fc, Fd have selected 10A/75mV point Flow device.

Below, charging side described in the utility model is described with the above-mentioned charge-discharge circuit including four charge/discharge units Method, this method use 90 ° of PWM synchronizations misphase (being exactly 120 ° during three tunnels, by that analogy), when the 1st group of trigger signal of single-chip microcomputer is touched When sending out first via IGBT units, inform that the 2nd group of trigger signal starts to trigger the second road IGBT units when PWM cycle completes 1/4, When the 2nd group of trigger signal triggers the second road IGBT units, inform that the 3rd group of trigger signal starts to touch when PWM cycle completes 1/4 The 3rd road IGBT units are sent out, when the 3rd group of trigger signal triggers the 3rd road IGBT units, inform the 4th group of trigger signal at PWM weeks Phase completes to start to trigger the 4th road IGBT units when 1/4, and completing synchronous 90 ° of triggerings of misphase when four groups of signals reflects rear class simultaneously Join output end, be then that four groups of ripple currents are overlapped mutually with 90 °, caused waveform after electric current mutually equilibrium -- referring to Fig. 4 Shown (" misphase " output ripple electric current), and its effect to electrochemical capacitor filtering system is likewise, the upper bridge of four groups of half-bridges Arm is each open-minded with 1/4 cycle misphase so that consistent to electrochemical capacitor ripple current -- and it is shown in Figure 4 that (" misphase " exports Bus current).

In summary, preferred embodiment only of the present utility model, not it is used for limiting the utility model implementation Scope, the equivalent change that all shape, construction, feature and spirit according to described in the utility model claims scope is made is with repairing Decorations, all should be included in right of the present utility model.

Claims

1. a kind of charge-discharge circuit based on half-bridge structure, including：The two-way inverters of AC/DC and it is connected in parallel on the two-way inversions of AC/DC Bus filter circuit on the DC output end of device, it is characterised in that：Described charge-discharge circuit also includes：At least three tunnel phases Mutually charge/discharge unit in parallel and the PWM misphases mutually to stagger at phase angle are provided for this at least three road charge/discharge unit driven Circuit, each charge/discharge unit include：First IGBT units and the 2nd IGBT units, the colelctor electrode of the first IGBT units and institute The direct-flow positive pole for stating the two-way inverters of AC/DC is connected, the colelctor electrode phase of the emitter stage and the 2nd IGBT units of the first IGBT units Even, the output end as the charge/discharge unit, the emitter stage of the 2nd IGBT units and the direct current negative pole phase of the two-way inverters of AC/DC Even, the earth terminal as the charge/discharge unit；The output end of charge/discharge unit is serially connected with after the reactor to match and connects respectively, As the output end of the charge/discharge unit, the base stage of the first all IGBT units and the 2nd IGBT units and the PWM are wrong The corresponding output end of phase drive circuit is connected.

2. the charge-discharge circuit according to claim 1 based on half-bridge structure, it is characterised in that：The charge/discharge unit Current divider is also serially connected between output end and the output end of the charge-discharge circuit.

3. the charge-discharge circuit according to claim 1 based on half-bridge structure, it is characterised in that：Described IGBT units are IGBT module.

4. the charge-discharge circuit according to claim 1 based on half-bridge structure, it is characterised in that：Described IGBT units by At least two IGBT single tubes are formed in parallel.

5. the charge-discharge circuit based on half-bridge structure according to one of Claims 1-4, it is characterised in that：Described mother Line filter circuit is formed in parallel by least two capacity identical electrochemical capacitors.