Airborne high frequency switching power supply design - Power Circuit - Circuit Diagram

MOS power ICs covering the entire range

High-frequency probe needles with a capacity of 10445 offer excellent line conductivity, capable of handling up to 3A.

Shunluo high-frequency inductors, including parallel stack inductors and winding inductors, are trusted by authorized agents worldwide.

KKST patch plug-in oscillators, both active and passive, are popular for their precision, with a frequency of 24.576000MHz.

The airborne high-frequency switching power supply products are specifically designed for an input of AC 400Hz. These products cater to the unique needs of military radar, aerospace, naval vessels, trains, and missile launches. In response to user requests, the development of localized onboard high-frequency switching power supply products for electronic weapon systems is crucial. This helps break international monopolies, enhances the mobility of our military equipment, and improves overall performance, which holds significant importance for national defense.

Two input modes are available for the onboard power supply: 115V/400Hz IF AC power and 28V DC power. Each input method has its own merits and drawbacks. The 115V/400Hz power supply offers stable fluctuations and higher device withstand voltages. However, the 28V DC power supply often requires reversal and must undergo isolation and regulation before being used as a DC power source. The onboard power supply operates in challenging environments, requiring adaptability across a wide temperature range (-40°C to +55°C) while withstanding stress, vibration, and humidity. Thus, the design reliability of these power supplies demands meticulous attention. This article primarily discusses the switching power supply designed for the 115V/400Hz intermediate frequency AC input mode. It achieves an adjustable output voltage between 270Vdc and 380Vdc, delivering an output power of at least 3000W, fully meeting military-grade power supply standards.

System Configuration and Main Circuit Design

Figure 1 illustrates the block diagram of the entire circuit. The design consists of two primary components: the boost power factor correction circuit and the DC/DC conversion circuit. The 115Vac/400Hz IF AC power supply undergoes filtering before entering the system. The boost power factor correction (PFC) circuit performs power factor correction, boosts the voltage, and stabilizes the energy storage. Subsequently, the DC/DC half-bridge converter, high-frequency rectifier filter, and output filter circuits ensure the desired output voltage range. A feedback control loop maintains the 270 to 380Vdc adjustable output performance.