H bridge bidirectional DC-DC modulation strategy based on dual carrier modulation

Abstract

The invention discloses a non-isolated H bridge bidirectional DC-DC converter modulation strategy based on dual carrier modulation, which includes the following steps: a DC bus voltage V<DC> is measured by a voltage sensor and compared with a given value V<ref> to obtain a difference; the obtained difference passes through a voltage loop PI module as a current reference value I<ref>; the current reference value I<ref> is compared with the inductor current I<l> measured by a current sensor to obtain a difference; the obtained difference passes through a current loop PI module and modulated by a double triangular carrier signal to obtain a required PWM wave; the PWM wave is used as a switch tube pulse driving signal to control on-off of a switch tube and to make the switch tube work in a continuous duty cycle state. In the invention, while the mode of an H bridge bidirectional DC-DC converter is switched, the duty cycle of the switch tube can be changed from an intermittent state to a continuous state, the control process is simplified, and when the mode of a switch is switched, the voltage overshoot becomes smaller and the adjustment time becomes shorter.

Description

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AI Technical Summary

Benefits of technology

This patented technology allows for efficient use of electrical energy by converting direct current (DC) into alternating current (AC). It also includes various methods such as double carrier or single carrier techniques used during AC conversions. By changing the ratio between two types of signals at certain points along its way, it can achieve better efficiency than traditional ways like pulse width modulated converters without sacrificing performance.

Problems solved by technology

This patented technical problem addressed by this patents relates to improving power conversion devices (PCD) such as direct current generators or batteries due to their ability to efficiently transfer electricity from one form into another without losing any significant amount of electrical energy during operation. Current methods involve converting alternating voltages directly onto AC waves through inductors or transformers, but these techniques have limitations because they require complex circuits involving multiple components like capacitors and resistive elements.

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