CN202617004U - Isolation type bidirectional DC/DC converter - Google Patents
Isolation type bidirectional DC/DC converter Download PDFInfo
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- CN202617004U CN202617004U CN 201220239800 CN201220239800U CN202617004U CN 202617004 U CN202617004 U CN 202617004U CN 201220239800 CN201220239800 CN 201220239800 CN 201220239800 U CN201220239800 U CN 201220239800U CN 202617004 U CN202617004 U CN 202617004U
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Abstract
The present utility model relates to an isolation type bidirectional DC/DC converter. The converter comprises two full bridge current transformers, each full bridge current transformer is formed by four switch tubes and diodes connected with each switch tube in reversal parallel; AC sides of the two full bridge current transformers are connected through an isolation transformer, DC sides of the two full bridge current transformers are all provided with filtering inductors, and each filtering inductor is connected with a switching relay in parallel. In the converter, the isolation mode is adopted, input and output electrical isolation is realized, mutual interference between input and output can be prevented; electrical safety can be guaranteed; turn ratio of the isolation transformer can be adjusted, and the change of input and output voltage can be conveniently realized.
Description
Technical field
The utility model relates to a kind of isolation type bidirectional DC/DC converter.
Background technology
Rise along with low-carbon (LC) and new forms of energy notion; In the application of electric automobile, regenerative resource, airplane power source and UPS etc.; Two-way DC/DC is the important component part that realizes the two-way flow of energy, can reduce unnecessary waste of energy, prolongs battery useful life.Simultaneously, along with the continuous development of urbanization, some metropolitan power loads difference round the clock cause electricity price different; Daytime, power load was big, and electricity price is high, and night, power load was little; Electricity price is low, and the large power energy storage device of utilization bidirectional flow can be realized the energy storage at night; The discharge of being incorporated into the power networks daytime alleviates electrical network pressure, price difference in the middle of also can earning.
The bidirectional energy-storage technology is very popular at present, and for the two-way DC/DC of pith wherein, the scheme of realization is generally the two-way DC/DC of non-isolation type.The two-way DC/DC of non-isolation type adopts two-way BUCK-BOOST circuit model usually, like Fig. 1.Wherein, the complementary conducting of Q1 and Q2.Basic principle is following:
1, VH is as input voltage source: when the Q1 conducting, Q2 turn-offs, the L1 energy storage, and when Q1 turn-offs, the Q2 conducting, inductance L 1 is through the Q2 afterflow, and this moment, circuit topology was similar to the BUCK circuit, realized energy mobile from VH to VL.
2, VL is as input voltage source: when the Q2 conducting, Q1 turn-offs, the L1 energy storage, and C1 powers to the load; When Q2 turn-offs, the Q1 conducting, VL powers to the load through inductance L 1, Q1, and when inductive current was 0, C1 powered to the load.The circuit topology of this moment is similar to the BOOST circuit, realizes energy flowing from VL to VH.This circuit topology has been realized non-isolated energy two-way flow, is the implementation of a kind of two-way DC/DC.
The foregoing circuit shortcoming mainly contain following some: owing to be the topological structure of non-isolation type, former felling does not have electrical isolation, so the interference between the input and output can not be controlled effectively.Aspect fail safe, the structure of non-isolation can not guarantee.In case faults such as output short-circuit take place, if it is can not accomplish quick shutoff, inevitable to the switch components from being damaged.Voltage ratio matching between input and the output is poor.
The utility model content
The purpose of the utility model provides a kind of isolation type bidirectional DC/DC converter, in order to solve available circuit aspect the isolation, the defective of fail safe aspect and aspect of performance.
For realizing above-mentioned purpose, the scheme of the utility model is: a kind of isolation type bidirectional DC/DC converter, comprise two full-bridge current transformers (3,4), and each full-bridge current transformer is made up of four switching tubes and the antiparallel diode of each switching tube; The AC side of two full-bridge current transformers connects through isolating transformer (T1), and the DC side of two full-bridge current transformers is equipped with filter inductance, and each filter inductance is a parallel connection transfer relay (K1, K2) all.
The AC side of each full-bridge current transformer is equipped with capacitance (C2, C3).
The DC side of each full-bridge current transformer all is parallel with filter capacitor (C1, C4).
The utility model adopts the isolated form mode, can realize the input and output electrical isolation, prevents the phase mutual interference between input and output; Guarantee electrical safety; The turn ratio of adjustment isolating transformer can realize the variation of input and output voltage easily.
Description of drawings
Fig. 1 is existing non-isolation DC/DC converter;
Fig. 2 is the workflow diagram of the utility model;
Fig. 3 is the circuit theory diagrams of the utility model;
Fig. 4 is the detail flowchart of the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is done further detailed explanation.
As shown in Figure 3, the utility model comprises two full-bridge current transformers (3,4), and each full-bridge current transformer is made up of four switching tubes and the antiparallel diode of each switching tube; The AC side of two full-bridge current transformers connects through isolating transformer (T1), and the DC side of two full-bridge current transformers is equipped with filter inductance, and each filter inductance is a parallel connection transfer relay (K1, K2) all.The AC side of each full-bridge current transformer is equipped with capacitance (C2, C3).The DC side of each full-bridge current transformer all is parallel with filter capacitor (C1, C4).Current transformer 3 comprises switching tube Q1, Q2, Q3, Q4 and diode D1, D2, D3, D4, and current transformer 4 comprises switching tube Q5, Q6, Q7, Q8 and switching tube D5, D6, D7, D8.DC/DC circuit two ends are VDC1 and VDC2.
When energy from VDC1 when VDC2 flows (charging), Q1, Q2, Q3, Q4 be as switching tube, Q5, Q6, Q7, Q8 disconnection, D5, D6, D7, D8 constitute full bridge rectifier; When energy from VDC2 when VDC1 flows (discharge), Q5, Q6, Q7, Q8 be as switching tube, Q1, Q2, Q3, Q4 disconnection, D1, D2, D3, D4 constitute full bridge rectifier.Discharging and recharging commutation circuit 1,2 comprises: inductance L 1 (L2) and transfer relay K1 (K2) thereof form.When energy from VDC1 when VDC2 flows (charging), K1 is closed, with the L1 short circuit, the K2 disconnection, L2 is as output inductor.When energy from VDC2 when VDC1 flows (discharge), K2 is closed, with the L2 short circuit, the K1 disconnection, L1 is as output inductor.Capacitance C2, C3: be connected on the former secondary of transformer, capacitance can make the transformer primary current make zero and prevent that the transformer appearance is straight inclined to one side and saturated.Filter capacitor C1, C4: the voltage filter that is used as former limit and felling.Isolating transformer T1 is used for realizing input and output electrical isolation and voltage change ratio.
Because the symmetry of circuit, under the charged state course of work of circuit and discharge process only the energy flow direction be opposite, but the course of work is essentially identical.Introduce the detailed operation process of charging and discharge condition below successively.
At first, introduce the course of work under the charged state, and attach with sequential chart.If the cycle is Ts.
1, arrive the ton period at t0, the pressure drop on the C2 is ignored in Q1, Q4 conducting; Supply voltage VDC1 is added on the winding N1 of transformer T1; Induced voltage on the secondary winding is N2*VDC1/N1, rectifier diode D6, D7 positively biased, and secondary side current flows through D6, D7; In the time of the L2 energy storage, capacitor C 4 chargings also provide load current.In primary side current Ip linear growth, the electric current on the inductance L 2 is linear growth also.
2, arrive the Ts/2 period at ton, Q1, Q4 end, and former limit of primary side transformer and secondary side inductive current all will be kept the original direction that flows, and get into Dead Time.At primary side, inductive current is through Q2, the antiparallel diode continuousing flow of Q3, and energy remaining is fed back to VDC1.Because the existence of leakage inductance, the voltage on the first side winding has the reverse of certain hour at this moment, for-VDC1.At secondary side; Induced voltage makes D5, D8 positively biased and conducting, and inductance L 2 electric currents are through D5, one group of diode continuousing flow of D8, simultaneously; The Circuit Fault on Secondary Transformer inductive current is through D6, one group of diode continuousing flow of D7; Because D5, D8 and D6, D7 conducting simultaneously at this moment, secondary winding voltage is that 0, winding voltage also is clamped to 0.-VDC1 all is added on the transformer leakage inductance, and the primary side inductive current descends rapidly, and when the primary side inductive current reduced to 0, it was inductance L 2 afterflows that rectifier diode D5, D8 and D6, D7 continue conducting.
3, in Ts/2 to the Ts period, Q2, Q3 conducting, its course of work and preceding half period are similar, and only voltage, current polarity are opposite.
Because circuit symmetrical, the discharge condition and the charged state course of work are similar, and the detailed operation process is following.
1, at t0 to the ton period, the pressure drop on the C3 is ignored in Q6, Q7 conducting, supply voltage VDC2 is added on the secondary winding N2 of transformer T1, the induced voltage on winding is N1*VDC2/N2, rectifier diode D1, D4 positively biased.Primary side current flows through D1, D4, and in the time of the L1 energy storage, capacitor C 1 charging also provides load current.In secondary side current Ip linear growth, the electric current on the inductance L 1 is linear growth also.
2, arrive the Ts/2 period at ton, Q6, Q7 end, and transformer secondary winding and former limit inductive current all will be kept the original direction that flows, and get into Dead Time.At the transformer secondary, inductive current is through Q5, the antiparallel diode continuousing flow of Q8, and energy remaining is fed back to VDC2.Because the existence of leakage inductance, the voltage on the secondary winding has the reverse of certain hour at this moment, for-VDC2.On the former limit of transformer; Induced voltage makes D2, D3 positively biased and conducting, and inductance L 1 electric current is through D2, one group of diode continuousing flow of D3, simultaneously; The former limit of transformer inductive current is through D1, one group of diode continuousing flow of D4; Because D2, D3 and D1, D4 conducting simultaneously at this moment, former limit winding voltage is 0, and the secondary winding voltage also is clamped to 0.-VDC2 all is added on the transformer secondary leakage inductance, and secondary current descends rapidly; When the transformer primary current reduced to 0, it was inductance L 1 afterflow that rectifier diode D2, D3 and D1, D4 continue conducting.
3, in Ts/2 to the TsT period, Q5, Q8 conducting, its course of work and preceding half period are similar, and only voltage, current polarity are opposite.
To sum up, the course of work of major loop is the extension of full-bridge converter.
Assign to say for control part, can be with the voltage of energy storage and discharge portion, current sample through sampling resistor or Hall element, the scope of sampled value is designed to identical, and sampling needs isolation on one side, another side is not isolated.Like this, because circuit is symmetrical, no matter be energy storage or discharge loop, all can a shared cover PID control circuit and a cover protective circuit.
Claims (3)
1. an isolation type bidirectional DC/DC converter is characterized in that, comprises two full-bridge current transformers (3,4), and each full-bridge current transformer is made up of four switching tubes and the antiparallel diode of each switching tube; The AC side of two full-bridge current transformers connects through isolating transformer (T1), and the DC side of two full-bridge current transformers is equipped with filter inductance, and each filter inductance is a parallel connection transfer relay (K1, K2) all.
2. a kind of isolation type bidirectional DC/DC converter according to claim 1 is characterized in that the AC side of each full-bridge current transformer is equipped with capacitance (C2, C3).
3. a kind of isolation type bidirectional DC/DC converter according to claim 1 is characterized in that the DC side of each full-bridge current transformer all is parallel with filter capacitor (C1, C4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220239800 CN202617004U (en) | 2012-05-25 | 2012-05-25 | Isolation type bidirectional DC/DC converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220239800 CN202617004U (en) | 2012-05-25 | 2012-05-25 | Isolation type bidirectional DC/DC converter |
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| CN202617004U true CN202617004U (en) | 2012-12-19 |
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| CN 201220239800 Expired - Fee Related CN202617004U (en) | 2012-05-25 | 2012-05-25 | Isolation type bidirectional DC/DC converter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103259414A (en) * | 2013-05-10 | 2013-08-21 | 国家电网公司 | DC/ DC translation circuit |
| CN104811047A (en) * | 2014-01-27 | 2015-07-29 | 伊顿制造（格拉斯哥）有限合伙莫尔日分支机构 | Bidirectional direct-current/direct-current converter and control method thereof |
| CN106787775A (en) * | 2016-12-30 | 2017-05-31 | 深圳市崧盛电子股份有限公司 | A kind of bidirectional, dc converter and its control method |
| CN114244125A (en) * | 2021-11-30 | 2022-03-25 | 华为数字能源技术有限公司 | DC converter and electronic device |
| WO2022088256A1 (en) * | 2020-10-30 | 2022-05-05 | 深圳市思倍生电子科技有限公司 | Bidirectional inverter circuit and bidirectional inverter charging apparatus |
-
2012
- 2012-05-25 CN CN 201220239800 patent/CN202617004U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103259414A (en) * | 2013-05-10 | 2013-08-21 | 国家电网公司 | DC/ DC translation circuit |
| CN104811047A (en) * | 2014-01-27 | 2015-07-29 | 伊顿制造（格拉斯哥）有限合伙莫尔日分支机构 | Bidirectional direct-current/direct-current converter and control method thereof |
| WO2015110051A1 (en) * | 2014-01-27 | 2015-07-30 | 伊顿制造（格拉斯哥）有限合伙莫尔日分支机构 | Bidirectional dc/dc converter and control method thereof |
| US10027232B2 (en) | 2014-01-27 | 2018-07-17 | Eaton Manufacturing LP, Glasgow Succursale, De Morges | Motor bi-directional DC/DC converter and control method thereof |
| CN104811047B (en) * | 2014-01-27 | 2019-03-15 | 山特电子（深圳）有限公司 | Two-way DC/DC converter and its control method |
| CN106787775A (en) * | 2016-12-30 | 2017-05-31 | 深圳市崧盛电子股份有限公司 | A kind of bidirectional, dc converter and its control method |
| CN106787775B (en) * | 2016-12-30 | 2019-08-13 | 深圳市崧盛电子股份有限公司 | A kind of bidirectional, dc converter and its control method |
| WO2022088256A1 (en) * | 2020-10-30 | 2022-05-05 | 深圳市思倍生电子科技有限公司 | Bidirectional inverter circuit and bidirectional inverter charging apparatus |
| CN114244125A (en) * | 2021-11-30 | 2022-03-25 | 华为数字能源技术有限公司 | DC converter and electronic device |
| CN114244125B (en) * | 2021-11-30 | 2024-04-09 | 华为数字能源技术有限公司 | DC converter and electronic device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20131202 Address after: 461000 Xuchang City, Henan Province Economic Development Zone XJ Electric City Patentee after: Xuji Electric Power Co., Ltd. Patentee after: Xuji Electric Co., Ltd. Patentee after: Qingdao Power Supply Company, State Grid Shandong Electric Power Company Address before: 461000 Xuchang City, Henan Province Economic Development Zone XJ Electric City Patentee before: Xuji Electric Power Co., Ltd. Patentee before: Xuji Group Co., Ltd. Patentee before: Qingdao Power Supply Co., Ltd., Shandong Electric Power Corporation |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121219 Termination date: 20200525 |