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Method and device for starting step-up dc/dc circuit with isolation transformer

An isolation transformer and step-up technology, which is applied in the field of start-up of step-up DC/DC circuits, can solve the problems of increased circuit cost and volume, increased circuit loss, etc.

Active Publication Date: 2017-04-19
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the use of flyback startup requires additional flyback windings and diodes in the circuit, resulting in an increase in the cost and volume of the circuit
The method of connecting resistors in parallel at both ends of the clamp capacitor Cc will increase the loss of the circuit

Method used

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  • Method and device for starting step-up dc/dc circuit with isolation transformer
  • Method and device for starting step-up dc/dc circuit with isolation transformer
  • Method and device for starting step-up dc/dc circuit with isolation transformer

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Embodiment Construction

[0047] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0048] The invention discloses a method for starting a step-up DC / DC circuit with an isolation transformer, wherein the structure of the step-up DC / DC circuit with an isolation transformer is as follows figure 1 As shown, it mainly includes an input inductor L, a clamping power transistor Sc, an output side capacitor C2, a first power transistor S1, a second power transistor S2, a third power transistor S3 and a fourth power transistor S4. The present inventio...

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Abstract

The invention discloses a starting method of a step-up DC / DC circuit with an isolation transformer. By controlling the turn-on and turn-off of four power tubes on the input side, the charging operation of the output-side capacitor is realized. The voltage of the output-side capacitor is The start-up process is complete when the voltage threshold is reached. The start-up method disclosed in the present invention is realized based on the original circuit without structural improvement of the circuit, and since no power-consuming elements such as resistors are added to the circuit, no additional loss is generated during the start-up process. The invention also discloses a starting device for a step-up DC / DC circuit with an isolation transformer.

Description

technical field [0001] The invention belongs to the technical field of DC / DC circuit control, in particular to a starting method and device for a step-up DC / DC circuit with an isolation transformer. Background technique [0002] In photovoltaic and energy storage systems, due to the low input voltage and high output voltage of the system, in order to adapt to a wider input voltage range, a step-up DC / DC circuit with an isolation transformer is often used. The structure of a step-up DC / DC circuit with an isolation transformer is as follows figure 1 As shown, it includes: transformer U1; input side capacitor C1 on the low voltage side, input inductor L, clamping power tube Sc, clamping capacitor Cc, first power tube S1, second power tube S2, third power tube S3 and The fourth power tube S4; the fifth power tube S5, the sixth power tube S6, the seventh power tube S7, the eighth power tube S8, the output side capacitor C2, the output inductor Lk and the third capacitor C3 locat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/36H02M3/335
CPCH02M1/36H02M3/33592Y02B70/10H02M3/33573
Inventor 朱瑞林宗艳玲李跃超薛丽英周灵兵
Owner SUNGROW POWER SUPPLY CO LTD
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