Abstract
Forward DC/DC converters are widely used in low and medium power circuits that are widely used in the aerospace and navigation fields. Power converters are usually sources of electromagnetic interference (EMI), which is due to their higher voltage and current transients. The traditional method is to add expensive filters on the primary side or the secondary side, but its disadvantages are high cost and poor adjustability. Based on the principle that the greater the number of derivations of voltage transients, the lower the high frequency electromagnetic interference contained in this voltage, a signal containing small high-frequency noise that is suitable for the hardware circuit as a reference signal is selected, and a closed-loop gate drive method is used in this paper, which attenuate the conducted EMI noise in the input bus of the forward DC/DC converter. The reference signal shapes the output signal to achieve the purpose of suppressing electromagnetic interference through the closed loop circuit. The advantages of this method are making the output highly adjustable, reducing hardware size and weight and lower cost compared with filter method. Compared with the method of controlling current to reduce electromagnetic interference, the proposed method is easier to implement. Firstly, the relationship between the derivative order of voltage transient and electromagnetic interference is introduced. Secondly, the experimental principle of single-ended forward circuit controlled by closed loop is introduced. Simulation and experimental results show that the proposed method can achieve voltage shaping and suppression of voltage overshoot effectively. Compared with the traditional hard-switching control method, the proposed method can make the high-frequency components of the drain-source voltage of the primary-side MOS transistor and the secondary-side output voltage have a greater attenuation.
Highlights
Single-ended forward converter is a common and popular power converter topology
In this paper, considering that high dv/dt will produce high electromagnetic interference, a closed loop is added to the single-ended forward power conversion ventilation circuit, referring to the active voltage control method and the characteristics of the single-ended forward power converter, appropriate Gaussian reference signal is set to control the transient voltage of the switch to improve the conductivity of the transient voltage of the switching metal-oxide-semiconductor field-effect transistor (MOSFET) to reduce the high frequency EMI noise
In this paper, according to the voltage converter index requirements, the component parameters required for the single-ended forward power converter are calculated
Summary
Single-ended forward converter is a common and popular power converter topology. It is widely used in consuming power supplies at 100–300 W power range because of its simple structure and less power electronic components, and its large current output capability and multiple outputs [1]. C. Xu et al.: Closed-Loop Gate Drive for Single-Ended Forward Converter to Reduce Conducted EMI balance technology [14], Soft switching technology [15], [16], [22] and active voltage control method [18]–[20] have been studied by scientists. In this paper, considering that high dv/dt will produce high electromagnetic interference, a closed loop is added to the single-ended forward power conversion ventilation circuit, referring to the active voltage control method and the characteristics of the single-ended forward power converter, appropriate Gaussian reference signal is set to control the transient voltage of the switch to improve the conductivity of the transient voltage of the switching MOSFET to reduce the high frequency EMI noise. By the drive circuit to control the turn-on turn-off voltage transient of the SiC MOSFET
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