Direct-current bus voltage regulation method and device of two-stage converter

A technology of DC bus and voltage regulating device, which is applied in the direction of converting DC power input into DC power output and output power conversion devices, instruments, etc. The effect of reducing voltage stress, reducing voltage spikes, and improving reliability

Active Publication Date: 2020-06-23
BEIJING SMARTCHIP MICROELECTRONICS TECH COMPANY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practical applications, DCDC converters often experience excessive diode voltage stress and damage, resulting in poor circuit reliability. In order to reduce diode damage, you can add a diode absorber circuit or use a diode with a higher voltage level, but the increase circuit cost

Method used

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  • Direct-current bus voltage regulation method and device of two-stage converter
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  • Direct-current bus voltage regulation method and device of two-stage converter

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Embodiment Construction

[0025] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0026] Unless expressly stated otherwise, throughout the specification and claims, the term "comprise" or variations thereof such as "includes" or "includes" and the like will be understood to include the stated elements or constituents, and not Other elements or other components are not excluded.

[0027] In order to overcome the problem of diode damage caused by excessive voltage stress of the DCDC circuit diode in the two-stage converter, the inventor conducted the following research. First, the CCM working state and the DCM working state of the DCDC converter were analyzed, and the output diode voltage stress was found to be The CCM (continuous conduction mode) working state is not high, but the stress is greater i...

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Abstract

The invention discloses a DC bus voltage regulation method and device of a two-stage converter. The bus voltage of a DCDC converter is adjusted according to the two dimensions of the output voltage and the output current. The bus voltage in the DCM state is far lower than the bus voltage in the full-load CCM state; therefore, the voltage stress of the output diode in the DCM state can be reduced,so the maximum voltage peak of the diode is especially reduced, and the voltage peak of the power MOS tube in the DCM state can be reduced, thereby improving the reliability of the circuit, reducing the number of diode absorption circuits, selecting a diode with a lower grade, and reducing the cost of the circuit.

Description

technical field [0001] The invention relates to the field of switching power supplies, in particular to a DC bus voltage regulating method and device for a two-stage converter. Background technique [0002] In the high-frequency switching source, the circuit diagram of the two-stage converter is as follows figure 1 Shown, including the first-stage PFC converter (power factor correction converter), and the second-stage DCDC converter. Among them, Vdc is the busbar voltage value of the DCDC converter. In practical applications, DCDC converters often experience excessive diode voltage stress and damage, resulting in poor circuit reliability. In order to reduce diode damage, you can add a diode absorber circuit or use a diode with a higher voltage level, but the increase circuit cost. [0003] The information disclosed in this Background section is only for enhancing the understanding of the general background of the present invention and should not be taken as an acknowledgm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/00H02M3/335H02M1/32
CPCH02M1/32H02M3/00H02M3/33569H02M1/0038H02M1/0067
Inventor 张相飞李晨光吴琼高伟峰赵志正黄钰森朱建国张孝杰张文明刘磊
Owner BEIJING SMARTCHIP MICROELECTRONICS TECH COMPANY
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