Direct current-direct current converter

Abstract

The invention discloses a direct current-direct current converter comprising a pulse width modulation module, a switching tube and a voltage regulation module. The output end of the pulse width modulation module is connected to the voltage regulation module via a switch tube. An inputted direct-current voltage passes through the pulse width modulation module to drive connection or disconnection ofthe switching tube; a square-wave voltage is generated based on the connection or disconnection of the switching tube; and the voltage regulation module carries out voltage regulation to obtain a needed voltage. The pulse width modulation module employs a pulse width modulator; and the output terminal of the pulse width modulator is connected with the switching tube. The voltage regulation moduleconsists of a transformer and a filter circuit. According to the invention, stable outputting of two paths of voltages is realized and the two paths of load capacities can be adjusted, so that the voltage regulation precision is improved substantially and the electricity consumption need of the load is ensured.

Description

technical field [0001] The invention relates to the field of electronic equipment, in particular to a DC-DC converter. Background technique [0002] The DC-DC converter converts a fixed DC voltage into a variable DC voltage, and is widely used in the stepless speed change and control of trolleybuses, subways and trains, making the above control have the advantages of smooth acceleration and fast response. The DC-DC converter mainly adopts high-frequency power conversion technology, that is, the DC voltage is converted into a high-frequency switching voltage through a power switching device, and the input and output are completely isolated. The output voltage is realized by a PWM modulation system. By adjusting the output The duty cycle of the waveform is used to adjust the size of the output DC voltage. The traditional PWM modulation system takes the sampling signal from the main winding as a feedback signal to modulate the output. This adjustment method has poor stability a...

AI Technical Summary

Problems solved by technology

The DC-DC converter mainly adopts high-frequency power conversion technology, that is, the DC voltage is converted into a high-frequency switching voltage through a power switching device, and the input and output are completely isolated. The output voltage is realized by a PWM modulation system. By adjusting the output The duty cycle of the waveform is used to adjust the size of the output DC voltage. The traditional PWM modulation system takes the sampling signal from the main winding as a feedback signal to modulate the output. This adjustment method has poor stability and is suitable for one circuit load, the application range is narrow

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