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Basic principles of DC power
2020-02-04 17:18
The high-frequency switching DC power supply adopts the full-bridge phase-shifting pulse-width modulation soft-switching control technology, which further improves the module efficiency and reduces the harmonics. The high-frequency switch DC power supply module adopts three-phase three-wire 380VAC balanced input, no phase sequence requirements, and no neutral line current loss. At the AC input end, advanced spike suppression devices and EMI filter circuits are used. The high-frequency switching DC power supply rectifies the three-phase AC power into DC by a full-bridge rectifier circuit. After passive power factor correction (PFC), the DC / DC high-frequency conversion circuit converts the obtained DC power into a stable and controllable DC power. Output. The pulse width modulation circuit (PWM) of the high-frequency switch DC power supply and the soft-switch resonance circuit automatically adjust the pulse width and phase shift angle of the high-frequency switch according to changes in the power grid and the load, so that the output voltage and current can be maintained under any allowable conditions. stable. The electric high-frequency switching power supply can not only perform various basic functions in a single machine, but also work in parallel and combine, and has a good parallel current sharing effect. The high-frequency switching DC power supply can realize the four remote functions of "telemetry, remote signaling, remote control and remote adjustment" by connecting with a microcomputer. The high-frequency switching DC power supply has perfect protection functions to ensure the safety and stability of the system under the independent operation of the module or module group and the computer monitoring. The high-frequency switching DC power module adopts bus sampling master and slave current sharing control mode. During parallel operation, a high-frequency switch DC power supply module group can automatically select a main module to process the external parameters such as current and voltage collected by the shunt to centrally control the output voltage and current of each module. Therefore, even at a low current, a better current sharing effect can be obtained.
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