Capacitor clamping type direct-current conversion circuit

A DC conversion circuit and capacitor clamping technology, which is applied in the direction of converting DC power input to DC power output, adjusting electrical variables, and converting equipment without intermediate conversion to AC, can solve the problem of inability to ensure the reverse of the capacitor clamping DC conversion circuit. To achieve the effects of ensuring reliability, simplifying the circuit, and avoiding uneven voltage
CN110994975AActive Publication Date: 2020-04-10SUNGROW POWER SUPPLY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SUNGROW POWER SUPPLY CO LTD
Publication Date
2020-04-10

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Abstract

The invention relates to the technical field of power electronics, and provides a capacitor clamping type direct-current conversion circuit which comprises a capacitor clamping type boost conversion module and a bypass module, wherein the input end of the bypass module is connected with the positive electrode of the input side of the capacitor clamping type boost conversion module, and the outputend of the bypass module is connected with a connection point of two diodes on a positive electrode branch in the capacitor clamping type boost conversion module and one end of the flying capacitor; therefore, if the positive electrode and the negative electrode of the input side of the capacitor clamping type boost conversion module are short-circuited, the voltage across the two ends of the bypass module can be clamped at the voltage across the two ends of the flying capacitor, serious uneven voltage between the bypass module and a diode at the rear stage of the bypass module on the positivebranch is avoided, and the reliability of reverse cut-off of the capacitor clamping type direct-current conversion circuit can be ensured without an additional voltage-sharing circuit.
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Description

technical field

[0001] The invention relates to the technical field of power electronics, in particular to a capacitor-clamped DC conversion circuit. Background technique

[0002] At present, in order to improve the situation that the capacitor-clamped boost conversion module loses more energy in the process of transferring energy when it does not perform boost conversion, the existing technology usually adopts the following figure 1 Capacitor-clamped boost converter module with bypass diode shown.

[0003] When the capacitor-clamped boost conversion module only performs energy transfer without boost conversion, the bypass diode Db bypasses the inductor L, the first diode D1 and the second diode D2, and the capacitor clamp The voltage on the input side of the bit-type boost conversion module is directly transmitted to the output side of the capacitor-clamped boost conversion module through the bypass diode Db, so as to reduce the loss in the transmission process. And when ...

Claims

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