Topological structure for high-power bidirectional DC/DC converter
A topology and converter technology, applied in the direction of converting DC power input to DC power output, output power conversion devices, instruments, etc., can solve problems such as complex topology and control, risk of current runaway, double cost, etc., to achieve control Easy, low cost, simple structure effect
Inactive Publication Date: 2012-07-25
TONGJI UNIV
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Problems solved by technology
It is characterized by a simple topology, but when the voltage on the high-voltage side fails to drop (voltage is lower than the low-voltage side), the anti-parallel diode of IGBT1 will fail to conduct, so there is a risk of current runaway, and additional high-speed protection devices must be added, such as figure 1 shown
[0007] (2) Double bridge arm topology: This is a topology formed by cascading two sets of single bridge arm topologies. Since there is a high-voltage capacitor link between the two single bridge arms that is higher than the voltage of the grid and the energy storage unit, the double bridge arm There is no risk of current runaway in the arm topology, but its topology and control are complicated and the cost is doubled, such as figure 2 shown
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[0022] like image 3 As shown, a high-power bidirectional DC / DC converter topology, including high-voltage side filter unit 1, bridge arm unit 2, energy storage and low-voltage side filter unit 3, energy storage unit 4, the high-voltage side filter unit 1 , the bridge arm unit 2, the energy storage and low-voltage side filter unit 3, and the energy storage unit are sequentially connected to 4, the bridge arm unit 2 includes a switch tube IGBT1, and a single bridge arm circuit composed of a switch tube IGBT2 and a switch tube IGBT3, The switch tube IGBT1, the switch tube IGBT2 and the switch tube IGBT3 all have anti-parallel diodes, the collector of the switch tube IGBT1 is connected to the collector of the switch tube IGBT2, and the emitter of the switch tube IGBT2 is connected to the switch tube IGBT3. The collector is connected, and the emitter of the switching tube IGBT1 and the emitter of the switching tube IGBT3 are connected with the high-voltage side filter unit.
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The present invention relates to a topological structure of high-power two-way DC / DC converter, which comprises a high-pressure side filtering unit, a bridge-arm unit, an energy-storing low-voltage side filtering unit, and an energy-storing unit which are orderly connected. The bridge-arm unit comprises a switching tube IGBT1 and a single bridge-arm unit which consists of a switching tube IGBT2 and a switching tube IGBT3. Compared with the prior art, the topological structure can be used in the DC high-power energy-saving equipment which is used for recovering and reusing the energy, effectively prevents the out-of-control current in the failure, rapidly completes the current protection, and has characteristics of high energy level of power, simple structure, easy control, high reliability and low cost. And the topological structure is more suitable for high-reliability two-way high-power projects.
Description
technical field [0001] The invention relates to a DC / DC converter, in particular to a topological structure of a high-power bidirectional DC / DC converter. Background technique [0002] The energy recovery system is an effective means to solve the problem of energy saving and emission reduction. It was first used in electric vehicles. These vehicles usually use batteries, such as lead-acid, nickel-metal hydride and lithium-ion batteries, as energy sources and their main energy components as power sources. However, when the vehicle starts, accelerates and climbs a slope, the battery is often subjected to a large charge and discharge current impact, the battery life is rapidly attenuated, and the energy generated during braking and braking cannot be effectively recovered. This is a major shortcoming of the traditional battery. The supercapacitor energy recovery system is a new type of energy storage technology that is more in line with environmental requirements and has been ex...
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IPC IPC(8): H02M3/155
Inventor 张逸成吴璐璐姚勇涛朱学军梁海泉王波沈玉琢王灵艳
Owner TONGJI UNIV