A Fast Response DC Converter System with High Step-Down Ratio

Abstract

The invention discloses a high step-down ratio fast response direct-current converter system which comprises a main circuit, a hysteresis comparator, a resistor (R1) and a resistor (R2), a capacitor (C), a feedback coefficient adjusting resistor (Rf) and a control resistor (R). The main circuit topology of the invention utilizes the intermediate inductance and the output side inductance divider characteristic to realize the conversion of high step-down ratio and utilizes a clamp capacitor for the soft-switching action of a circuit. Through the use of the hysteresis loop controller in the control circuit to realize the fast transient response under the new topology structure, for the design of the feedback branch of different outputted voltage and the combination of the working characteristics of the hysteresis comparator, the pulse width of the control signal can be effectively adjusted to achieve the stability of the outputted voltage.

Description

technical field [0001] The invention relates to a fast-response DC converter system with a high step-down ratio. Background technique [0002] At present, DC converters are more and more widely used in battery energy storage, distributed photovoltaic power generation, electric vehicles and other fields. With the widespread application of solar photovoltaic power generation and other new energy sources with low output voltage, the research on high-power and high-gain converters has become one of the hotspots in the field of electric power research. Realizing the high gain and high reliability of the DC / DC converter and the fast response characteristics to the load adjustment are the directions that the DC converter strives for. [0003] The traditional DC converter output voltage can be expressed as V O =V in d / N, where Vo mainly depends on the transformer turns ratio N and duty cycle d. In order to reduce the impact of low duty cycle at high step-down ratios, the ratio o...

AI Technical Summary

Problems solved by technology

However, when the input voltage and load change suddenly in this control method, due to the delay lag caused by the compensation circuit of the voltage error amplifier in the control circuit, it not only causes its transient response to be slow, but also reduces its dynamic characteristics.

Moreover, the compensation circuit of the voltage error amplifier is more complicated to design and debug

The above problems have brought a lot of difficulties to designers, prolonging the design cycle and consuming a lot of manpower and material resources.

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