CN202178707U - Full-bridge isolation direct-current converter - Google Patents
Full-bridge isolation direct-current converter Download PDFInfo
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- CN202178707U CN202178707U CN201120277173XU CN201120277173U CN202178707U CN 202178707 U CN202178707 U CN 202178707U CN 201120277173X U CN201120277173X U CN 201120277173XU CN 201120277173 U CN201120277173 U CN 201120277173U CN 202178707 U CN202178707 U CN 202178707U
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Abstract
The utility model discloses a full-bridge isolation direct-current converter. A fifth rectifying tube and a sixth rectifying tube are respectively arranged between two ends of an isolation transformer vice-side winding and the ground. An intermediate tap of the isolation transformer vice-side winding is connected with the ground in series through a first capacitor and a first inductor. Two ends of the first capacitor serve as low-voltage ends and output low voltage. A second transformer, a second inductor, a first diode and a second diode are further included. Two ends of a second transformer original-side winding are respectively connected with two ends of the isolation transformer vice-side winding, and the two ends of the isolation transformer vice-side winding are respectively connected with the cathodes of the first diode and the second diode, and the anodes of the first diode and the second diode are connected to the ground. One end of the second inductor is connected with the intermediate tap of the isolation transformer vice-side winding, and the other end of the second inductor is connected with a connection end of the first inductor and the first capacitor. The full-bridge isolation direct-current converter is small in energy consumption, high in switching efficiency and low in cost.
Description
Technical field
The utility model relates to power technology, particularly a kind of full-bridge isolated DC converter.
Background technology
At present, to low voltage DC/DC (direct current) converter, mainstream technology adopts full-bridge isolated variable technology for the high pressure more than the automobile-used 1.2kW.Its typical circuit is as shown in Figure 1; The former limit of isolating transformer T winding is connected between the contact of contact and the 3rd switching tube Q3, the 4th switching tube Q4 of the first switching tube Q1, second switch pipe Q2; Second switch pipe Q2, the 3rd switching tube Q3 and the first switching tube Q1, the 4th switching tube Q4 alternate conduction in each cycle; ON time is adjustable, and being added to the former limit of transformer winding voltage is that amplitude is the alternation square wave of high pressure Vin.Meet the 5th rectifying tube Q5, the 6th rectifying tube Q6 between the two ends of isolating transformer secondary winding and the ground respectively; The centre tap of isolating transformer secondary winding is concatenated into ground through first inductance L 1, first capacitor C 1, and low pressure Vo is exported as low-pressure end in first capacitor C, 1 two ends.When the first switching tube Q1, the 4th switching tube Q4 conducting; Energy is transferred to secondary from former limit, and at this moment the 6th rectifying tube Q6 that two ends connect of isolating transformer secondary winding is open-minded, and the 5th rectifying tube Q5 closes; At this time the 5th rectifying tube Q5 equivalence is an electric capacity, and transformer T charges to it.Because itself there is leakage inductance in transformer T, there is LC resonance in charging process, thereby causes voltage overshoot.Same, as second switch pipe Q2, when the 3rd switching tube Q3 opens, the 5th rectifying tube Q5 conducting, it is an electric capacity that the 6th rectifying tube Q6 closes equivalence, the 6th rectifying tube Q6 also can bear same resonance surge voltage.
Bring injury for isolating transformer secondary rectifying tube that winding connects for fear of this resonance surge voltage; Common way is to add the absorption resistance condenser network to realize protection at present; As shown in Figure 2; Between leak in the source of the 5th rectifying tube Q5, the 6th rectifying tube Q6, be connected in series bypass resistance and electric capacity respectively, the impact energy of transformer leakage inductance is stored on the shunt capacitance of the 5th rectifying tube Q5 or the 6th rectifying tube Q6, and when next rectifying tube is opened, energy is discharged; Impact energy finally discharges with the mode of bypass resistance heating, and the surge voltage to rectifying tube has just reduced greatly like this.The advantage of this scheme is that cost is low, and scheme is ripe, and shortcoming is that resistance heating is relatively more severe, and energy loss is bigger, and conversion efficiency descends 1～1.5 percentage point.
Bring injury for isolating transformer secondary rectifying tube that winding connects for fear of this resonance surge voltage; Another kind of design is that the impact energy on the rectifying tube is collected on the electric capacity; Do initiatively absorption through a Buck circuit (buck translation circuit) again, send energy to pass to low-pressure end.As shown in Figure 3; Still place a smaller RC between leak in the source of the 5th rectifying tube Q5, the 6th rectifying tube Q6 respectively and absorb circuit; Resonant energy with the absorbing high-frequency part; Other most resonant energies store on the 3rd capacitor C 3 through the 3rd diode D3 and the 4th diode D4, through the buck circuit power transfer on the 3rd capacitor C 3 are arrived low-pressure end at last.The advantage of this scheme is that conversion efficiency and heating problem can effectively be solved, and still independently comprises one or control switch pipe in the buck circuit owing to one, and cost is high, also can increase the expense of system, control circuit, increase system control difficulty.
The utility model content
The technical problem that the utility model will solve provides a kind of full-bridge isolated DC converter, and energy loss is less, and conversion efficiency is high, and cost is low.
For solving the problems of the technologies described above; The full-bridge isolated DC converter of the utility model; Connect the 5th rectifying tube, the 6th rectifying tube between the two ends of isolating transformer secondary winding and the ground respectively; To ground, low pressure is exported as low-pressure end in the first electric capacity two ends to the centre tap of isolating transformer secondary winding through first inductance, first capacitance series; Also comprise second transformer, second inductance, first diode, second diode;
Winding two ends, the former limit of said second transformer join with the two ends of isolating transformer secondary winding respectively; The said second transformer secondary winding two ends connect the negative terminal of said first diode, second diode respectively; The positive ending grounding of said first diode, second diode; The said second transformer secondary winding centre tap of said second inductance, one termination, said first inductance of another termination is with the link of first electric capacity.
Winding two ends, the former limit of said second transformer can connect the negative terminal of the 5th diode, the 6th diode respectively, and the two ends of said isolating transformer secondary winding connect the anode of the 5th diode, the 6th diode respectively;
The centre tap of the former limit of said second transformer winding connects the centre tap of said isolating transformer secondary winding;
Be connected to the 5th electric capacity, the 6th electric capacity respectively between the two ends of centre tap with the former limit of said second transformer winding of the former limit of said second transformer winding.
The transformation ratio of said second transformer more than or equal to 2 smaller or equal to 3.5.
The transformation ratio of second transformer that protects can be 2.5.
The transformation ratio of said second transformer can be 3.
The full-bridge isolated DC converter of the utility model; On the basis of basic full-bridge isolation conversion topologies structure, increase by an active absorption circuit; Comprise one second transformer in this active absorption circuit, basic full-bridge is isolated the resonance impact energy that the isolating transformer itself in the conversion topologies structure exists leakage inductance to produce, and is delivered to its secondary through the former limit of said second transformer; Output low-pressure end voltage is to the low-pressure end of full-bridge isolated DC converter; The resonance impact energy finally is converted into the output of low-pressure end voltage, and energy loss is little, and conversion efficiency is high; This active absorption circuit does not need the control switch pipe; The switching process that it isolates the rectifying tube that the isolating transformer secondary in the conversion topologies structure connect through basic full-bridge realizes the transmission of energy; Output to full-bridge isolated DC converter low-pressure end to the overshoot voltage power conversion on the rectifying tube for the low-pressure end voltage energy; The big system that the switching frequency of this circuit and duty ratio modulation are followed whole full-bridge isolated DC converter changes together; Need not independently control circuit, simplified the control complexity, saved and controlled cost and the switching tube cost.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the utility model is done further explain.
Fig. 1 is the typical circuit of full-bridge isolated DC converter;
Fig. 2 is the full-bridge isolated DC converter that adds the absorption resistance condenser network;
Fig. 3 is the full-bridge isolated DC converter that adds active absorption Buck circuit;
Fig. 4 is the full-bridge isolated DC converter first execution mode circuit diagram of the utility model;
Fig. 5 is the full-bridge isolated DC converter second execution mode circuit diagram of the utility model.
Embodiment
Full-bridge isolated DC converter first execution mode of the utility model is as shown in Figure 4; Comprise isolating transformer T, the first switching tube Q1, second switch pipe Q2, the 3rd switching tube Q3, the 4th switching tube Q4, the 5th rectifying tube Q5, the 6th rectifying tube Q6, first inductance L 1, first capacitor C 1, also comprise the second transformer T2, second inductance L 2, the first diode D1, the second diode D2;
Isolating transformer T, the first switching tube Q1, second switch pipe Q2, the 3rd switching tube Q3, the 4th switching tube Q4, the 5th rectifying tube Q5, the 6th rectifying tube Q6, first inductance L 1, first capacitor C 1 have been formed the most basic full-bridge and have been isolated the conversion topologies structure.The former limit of isolating transformer T winding is connected between the contact of contact and the 3rd switching tube Q3, the 4th switching tube Q4 of the first switching tube Q1, second switch pipe Q2; Second switch pipe Q2, the 3rd switching tube Q3 and the first switching tube Q1, the 4th switching tube Q4 alternate conduction in each cycle; ON time is adjustable, and being added to the former limit of transformer winding voltage is that amplitude is the alternation square wave of high pressure Vin.Meet the 5th rectifying tube Q5, the 6th rectifying tube Q6 between the two ends of isolating transformer secondary winding and the ground respectively; The centre tap of isolating transformer secondary winding is concatenated into ground through first inductance L 1, first capacitor C 1, and low pressure Vo is exported as low-pressure end in first capacitor C, 1 two ends.
The second transformer T2, second inductance L 2, the first diode D1, the second diode D2 constitute an active absorption circuit.Winding two ends, the former limit of the said second transformer T2 join with the two ends of isolating transformer T secondary winding respectively; The said second transformer T2 secondary winding two ends connect the negative terminal of the said first diode D1, the second diode D2 respectively; The positive ending grounding of the said first diode D1, the second diode D2; The said second transformer T2 secondary winding centre tap of said second inductance L, 2 one terminations, the link of said first inductance L 1 of another termination, first capacitor C 1.Because the resonance surge voltage at the two ends of isolating transformer secondary winding probably is the twice of normal voltage, the transformation ratio of the second transformer T2 can be 2.5,3 etc. more than or equal to 2 smaller or equal to the transformation ratio of 3.5, the second transformer T2.
Full-bridge isolated DC converter second execution mode of the utility model is as shown in Figure 5, and the difference of itself and first execution mode is that the active absorption circuit also comprises the 5th capacitor C 5, the 6th capacitor C 6, the 5th diode D5, the 6th diode D6; Winding two ends, the former limit of said second transformer connect the negative terminal of the 5th diode, the 6th diode respectively, and the two ends of said isolating transformer secondary winding connect the anode of the 5th diode, the 6th diode respectively; The centre tap of the former limit of said second transformer winding connects the centre tap of said isolating transformer secondary winding; Be connected to the 5th electric capacity, the 6th electric capacity respectively between the two ends of centre tap with the former limit of said second transformer winding of the former limit of said second transformer winding.
Be connected to the absorption of the resonance surge voltage of the 5th rectifying tube Q5 when having accelerated further with the 5th capacitor C 5, the 5th diode D5 between the centre tap of the former limit of said second transformer winding that the 5th rectifying tube Q5 closes, be connected to the absorption of the resonance surge voltage of the 6th rectifying tube Q6 when having accelerated further with the 6th capacitor C 6, the 6th diode D6 between the centre tap of the former limit of said second transformer winding that the 6th rectifying tube Q6 closes.
The full-bridge isolated DC converter of the utility model; On the basis of basic full-bridge isolation conversion topologies structure, increase by an active absorption circuit; Comprise one second transformer in this active absorption circuit, basic full-bridge is isolated the resonance impact energy that the isolating transformer itself in the conversion topologies structure exists leakage inductance to produce, and is delivered to its secondary through the former limit of said second transformer; Output low-pressure end voltage is to the low-pressure end of full-bridge isolated DC converter; The resonance impact energy finally is converted into the output of low-pressure end voltage, and energy loss is little, and conversion efficiency is high; This active absorption circuit does not need the control switch pipe; The switching process that it isolates the rectifying tube that the isolating transformer secondary in the conversion topologies structure connect through basic full-bridge realizes the transmission of energy; Output to full-bridge isolated DC converter low-pressure end to the overshoot voltage power conversion on the rectifying tube for the low-pressure end voltage energy; The big system that the switching frequency of this circuit and duty ratio modulation are followed whole full-bridge isolated DC converter changes together; Need not independently control circuit, simplified the control complexity, saved and controlled cost and the switching tube cost.
Claims (5)
1. full-bridge isolated DC converter; Connect the 5th rectifying tube, the 6th rectifying tube between the two ends of isolating transformer secondary winding and the ground respectively; To ground, low pressure is exported as low-pressure end in the first electric capacity two ends to the centre tap of isolating transformer secondary winding through first inductance, first capacitance series; It is characterized in that, also comprise second transformer, second inductance, first diode, second diode;
Winding two ends, the former limit of said second transformer join with the two ends of isolating transformer secondary winding respectively; The said second transformer secondary winding two ends connect the negative terminal of said first diode, second diode respectively; The positive ending grounding of said first diode, second diode; The said second transformer secondary winding centre tap of said second inductance, one termination, said first inductance of another termination is with the link of first electric capacity.
2. full-bridge isolated DC converter according to claim 1 is characterized in that,
Winding two ends, the former limit of said second transformer connect the negative terminal of the 5th diode, the 6th diode respectively, and the two ends of said isolating transformer secondary winding connect the anode of the 5th diode, the 6th diode respectively;
The centre tap of the former limit of said second transformer winding connects the centre tap of said isolating transformer secondary winding;
Be connected to the 5th electric capacity, the 6th electric capacity respectively between the two ends of centre tap with the former limit of said second transformer winding of the former limit of said second transformer winding.
3. full-bridge isolated DC converter according to claim 1 and 2 is characterized in that, the transformation ratio of second transformer more than or equal to 2 smaller or equal to 3.5.
4. full-bridge isolated DC converter according to claim 1 and 2 is characterized in that, the transformation ratio of second transformer is 2.5.
5. full-bridge isolated DC converter according to claim 1 and 2 is characterized in that, the transformation ratio of second transformer is 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120277173XU CN202178707U (en) | 2011-08-02 | 2011-08-02 | Full-bridge isolation direct-current converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120277173XU CN202178707U (en) | 2011-08-02 | 2011-08-02 | Full-bridge isolation direct-current converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202178707U true CN202178707U (en) | 2012-03-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120277173XU Withdrawn - After Issue CN202178707U (en) | 2011-08-02 | 2011-08-02 | Full-bridge isolation direct-current converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202178707U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102290993A (en) * | 2011-08-02 | 2011-12-21 | 联合汽车电子有限公司 | Full-bridge isolated DC converter |
| CN107431437A (en) * | 2015-03-09 | 2017-12-01 | 弗罗纽斯国际有限公司 | With the controlled resonant converter with centre tapped transformer |
-
2011
- 2011-08-02 CN CN201120277173XU patent/CN202178707U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102290993A (en) * | 2011-08-02 | 2011-12-21 | 联合汽车电子有限公司 | Full-bridge isolated DC converter |
| CN102290993B (en) * | 2011-08-02 | 2014-07-02 | 联合汽车电子有限公司 | Full-bridge isolated DC converter |
| CN107431437A (en) * | 2015-03-09 | 2017-12-01 | 弗罗纽斯国际有限公司 | With the controlled resonant converter with centre tapped transformer |
| CN107431437B (en) * | 2015-03-09 | 2020-07-07 | 弗罗纽斯国际有限公司 | Resonant converter with center tapped transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120328 Effective date of abandoning: 20140702 |
|
| RGAV | Abandon patent right to avoid regrant |