A Forward Power Supply Circuit with Multiple Transistors in Series

Abstract

The invention relates to a forward power circuit of multiple tubes connected in series. The forward power circuit comprises a forward four-tube series forward circuit, a transformer main circuit, a master control circuit, a driving circuit, a rectification freewheeling circuit and a starting circuit, and wherein forward multi-tube series circuit comprises N MOS tubes. With the adoption of the forward power circuit of multiple tubes connected in series, different voltage class occasions are achieved, a stable voltage can be output by employing the same control circuit, and the application performance of a circuit power supply is improved; and moreover, the circuit is simple and reliable to construct, and the research cost and the research time are reduced. With the adoption of the master control circuit, control on different switch states of the MOS tubes is achieved under different voltage classes, the application range and the accurate control capability of the switch power supply areimproved, closed-loop control of multi-path voltage and current is achieved, and the stability of each output voltage of the switch power supply is improved.

Description

technical field [0001] The invention relates to a forward power supply circuit with multiple tubes connected in series, belonging to the technical field of switching power supplies. Background technique [0002] With the development of power electronics technology, power modules have been widely used in various fields, and switching power supplies have gradually replaced linear power supplies and become mainstream power supplies. Under the action of PWM, the power switch tube of the switching power supply performs the opening and closing actions, and chops the bus voltage into a pulse voltage. The drive control circuit controls the duty cycle of the PWM to ensure the stability of the voltage. In small and medium power DC-DC switching power supplies, the most commonly used circuit topology is flyback switching power supply and forward circuit. In these two circuits, the switching frequency of the circuit is generally greater than 100KHz, and the core part is the design of t...

AI Technical Summary

Problems solved by technology

[0003] At present, in the current design of forward switching power supply, a single power switch tube is generally used as the bus voltage chopper switch, and the input voltage of the circuit is limited. Different power switches need to be designed according to different requirements each time, which mainly makes the research and development cost high. The research and development cycle becomes longer; at the same time, only a single drive control chip is generally used to complete the closed-loop control of the output voltage, the protection measures are not perfect, and other multi-channel closed-loop control or effective monitoring cannot be performed, the safety is relatively low, and it is inconvenient to use

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