Three-level half-bridge soft switching converter circuit, control system and control method thereof

A technology of three-level half-bridge and control method, which is applied in the direction of high-efficiency power electronic conversion, conversion of AC power input to DC power output, electrical components, etc., and can solve problems such as poor soft switching effect, complex circuit, and complex control algorithm. Achieve the effect of simple and convenient control, realize neutral point potential balance, and realize dynamic voltage clamping

Active Publication Date: 2021-06-18
JINING AOTAI ELECTRICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, although there is a topology in which the converter circuit adopts soft switching, each switching tube is hard-off when it is turned off, and can only achieve zero-voltage conduction, and the soft-switching effect is poor, or a passive auxiliary network is used. Realize the zero-voltage switch of the three-level half-bridge circuit, but the auxiliary network increases the complexity and cost of the system, or uses

Method used

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  • Three-level half-bridge soft switching converter circuit, control system and control method thereof
  • Three-level half-bridge soft switching converter circuit, control system and control method thereof
  • Three-level half-bridge soft switching converter circuit, control system and control method thereof

Examples

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Example Embodiment

[0056] Example one

[0057] This example discloses a three-level half-bridge soft switching converter circuit. Such as figure 1As shown, a three-level half-bridge soft switch converter circuit includes an input capacitor group 1, an input capacitor group 2, a three-level half-bridge inverter circuit, a saturated inductance Lx1, a homogenizer LX2, a vertical capacitor CX , The transformer T and the output circuit, the input capacitor group 1, the input capacitor group 2 and the three-level half bridge inverter circuit are connected in parallel, the saturation inductance, the separating capacitance, the primary side of the transformer, and one end is connected to the three levels. The middle point of the bridge arm of the half bridge inverter, the other end is connected to the midpoint of the input capacitor group 1, the interlocation diode connection of the three-level half-bridge inverter circuit is connected to the input capacitor group 2 circuit. The transformer subsideral is co...

Example Embodiment

[0080] Example 2:

[0081] Such as figure 2 As shown, the second embodiment of the present invention is based on the three-level half-bridge soft switching circuit of the embodiment, and the two ends of each switching tube of the three-level half-bridge inverter circuit bridge arm are parallel. Used to further reduce the shutdown loss of the switch tube. However, after the parallel capacitor, additional circuitry needs to be added to ensure that the parallel capacitor is discharged directly in the no-load or light load state. Or apply the application environment of the converter circuit under the occasion of the unloaded or light load state. Or the parallel capacitance value is small, and the soft switching effect is limited.

[0082] The other configuration of the circuit of this embodiment and the circuit working principle are identical to the embodiment, and will not be described herein.

Example Embodiment

[0083] Example 3:

[0084] Such as image 3 As shown, the third embodiment of the present invention is based on the three-level half-bridge soft switching circuit circuit of the embodiment, and the two ends of the switch tube clamping circuit are used to cross the capacitor CS1 to realize the upper and lower bridge arms. One pair of switching tubes, which realizes the dynamic voltage clamping of the switchboard, but will increase the complexity of the circuit under the premise of using a simpler control method.

[0085] The other configuration of the circuit of this embodiment and the circuit working principle are identical to the embodiment, and will not be described herein.

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Abstract

The invention provides a three-level half-bridge soft switching converter circuit, a control system and a control method thereof. The three-level half-bridge soft switching converter circuit comprises a first input capacitor bank, a second input capacitor bank and a three-level half-bridge inverter circuit which are connected in parallel, and a first inductor, a blocking capacitor, a transformer and an output circuit. After the first inductor, the blocking capacitor and the primary side of the transformer are connected in series, one ends of the first inductor, the blocking capacitor and the primary side of the transformer are connected with the midpoint of a bridge arm of the three-level half-bridge inverter circuit, the other ends of the first inductor, the blocking capacitor and the primary side of the transformer are connected with the midpoint of the first input capacitor bank, the clamping diode connecting midpoint of the three-level half-bridge inverter circuit is connected with the midpoint of the second input capacitor bank, and the secondary side of the transformer is connected with the output circuit. Each switching tube can be in a soft switching state when being turned on and turned off. Mid-point potential balance of the input capacitor is realized.

Description

technical field [0001] The disclosure belongs to the technical field of DC-AC-DC converter circuits, and in particular relates to a three-level half-bridge soft-switch converter circuit and a control method thereof. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] The traditional two-level converter circuit has the advantages of simple topology and easy control, and is widely used in various DC-AC-DC converter circuits. However, the two-level converter circuit also has problems such as high requirements for the withstand voltage of the switching tube, large switching stress, and difficulty in increasing the frequency, which are greatly restricted in high-voltage input applications. The three-level half-bridge inverter circuit has half the withstand voltage of the switch tube as that of the two-level inverter circuit, the switch stress is ...

Claims

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Application Information

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IPC IPC(8): H02M7/5387H02M1/088
CPCH02M7/53871H02M1/088Y02B70/10
Inventor 张光先张甫国李昊张延河张海林吕金建
Owner JINING AOTAI ELECTRICAL
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