Three-level half-bridge soft switching DC (direct current) converting circuit and method for suppressing midpoint drifting
A DC conversion circuit, three-level half-bridge technology, applied in the direction of converting DC power input to DC power output, adjusting electrical variables, converting AC power input to DC power output, etc. complication and other issues, to achieve the effect of small duty cycle loss, low cost, and suppression of mid-point voltage drift
Active Publication Date: 2015-01-28
株洲麦格米特电气有限责任公司
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These measures are often accompanied by increased cost, reduced conversion efficiency, and complicated design
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Embodiment 1 3
[0028] For the structure of the three-level DC conversion circuit in Embodiment 1, see figure 2 , the DC blocking capacitor C3 is directly connected to the midpoint of the input voltage dividing capacitors C1 and C2, and C1=C2>C3. Structurally, any midpoint current that causes voltage imbalance between C1 and C2 must flow through C3. For example, if the power transmitted by C1 to the secondary side is greater than C2, and the circuit enters an unbalanced working state, the working current will flow into the midpoint of the connection between C1 and C2, the voltage of C1 will gradually decrease, and the voltage of C2 will gradually rise. There will be some drift. Considering the small capacity of the DC blocking capacitor C3, the net current flowing into the midpoint of the connection between C1 and C2 will quickly accumulate a certain DC voltage on the DC blocking capacitor C3, so that when the circuit enters a new stable working state, the middle of C1 and C2 Point voltage...
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The invention discloses a three-level half-bridge soft switching DC (direct current) converting circuit and a method for suppressing midpoint drifting. In the circuit, a switching converter is connected with a midpoint in a capacitance voltage division circuit by a bridging capacitor, thus midpoint currents causing the midpoint voltage to drift are accumulated on the bridging capacitor to form DC voltage quantity; and positive and negative working voltages at a transformer end are regulated in accordance with the accumulated voltage quantity on the bridging capacitor, so that the drifting quantity of the midpoint voltages are suppressed. In the three-level half-bridge soft switching DC converting circuit, the basic characteristics of a traditional three-level half-bridge soft switching circuit are reserved; the three-level half-bridge soft switching DC converting circuit can suppress the midpoint voltage drifting of input capacitance effectively, can ensure the smooth realization of lagged turning-off tube soft switching relative to a resonant inductor with less inductance and is low in the duty rate loss. The method has the advantages of low cost, high performance and high reliability.
Description
[technical field] [0001] The invention relates to a DC-AC conversion circuit, in particular to a three-level half-bridge soft-switching DC conversion circuit and a method for suppressing midpoint voltage drift of the three-level half-bridge soft-switching DC conversion circuit. [Background technique] [0002] The traditional three-level half-bridge soft-switching DC conversion circuit has the advantages of simple topology, easy control, ZVS can be realized by the primary switch tube, high circuit efficiency, and low EMI. It is widely used in the DC conversion part of three-phase AC AC / DC power supply. [0003] The traditional PWM type three-level soft switching DC conversion circuit such as figure 1 shown. Capacitive voltage dividing circuit composed of voltage dividing capacitors C1 and C2, switching bridge arm composed of switching tubes Q1, Q2, Q3, Q4 connected in series, switching tube clamping circuit composed of switching tube clamping diodes D1 and D2, transformer cl...
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IPC IPC(8): H02M7/487H02M3/335
Inventor 韩龙飞
Owner 株洲麦格米特电气有限责任公司