Power converter and control method for a starter generator system

A technology for power converters and power generation systems, applied in output power conversion devices, control systems, control generators, etc., can solve problems such as limiting SGCU efficiency and power density, and achieve better and more flexible control strategies, simple and flexible control. effect of adjustment

Active Publication Date: 2021-05-18
南京兴航动力科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heat loss caused by the voltage drop of the three-phase rectifier bridge diode in the main power circuit will multiply as the power increases, which greatly limits the efficiency and power density of the SGCU

Method used

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  • Power converter and control method for a starter generator system
  • Power converter and control method for a starter generator system
  • Power converter and control method for a starter generator system

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Embodiment Construction

[0026] The technical solution of this patent will be described in detail below in conjunction with the accompanying drawings, taking a three-phase motor system as an example.

[0027] Such as figure 1Provides a general block diagram of the power converter used in the aviation starting power generation system, as shown in the figure, including MOSFET three-phase full bridge, drive circuit, isolated drive power supply, control circuit (arranged on the digital control circuit board as shown in the figure) and current sampling circuit. Each MOSFET in the three-phase full bridge has an independent drive circuit, and the drive circuits and the control circuit are respectively connected by PWM signal, K signal and C signal. The PWM signal is the switch signal sent by the control circuit to the drive circuit. The K signal is the strobe signal sent by the control circuit to the drive circuit, and the C signal is the MOSFET state signal sent by the drive circuit to the control circuit,...

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Abstract

The invention discloses a power converter of a starting power generation system and a control method thereof. The power converter includes a three-phase full-bridge inverter module, a drive circuit and a control circuit. The three-phase full-bridge inverter module is composed of parasitic anti-parallel body diode MOSFET modules, each MOSFET corresponds to one of the driving circuits, characterized in that the driving circuit is a composite driving circuit, in the starting mode, the driving circuit works in a typical MOSFET driving mode, and the MOSFET module realizes the inverter bridge function; in the power generation mode, the drive circuit responds to the gate signal of the control circuit to selectively drive the MOSFET on and off, and the MOSFET module realizes the function of the rectifier bridge. This solution uses a three-phase MOSFET module to realize the integrated integration of the power circuit for starting and power generation. Through the MOSFET switch control, the conduction loss of the rectifier output in the power generation mode is greatly reduced, the system efficiency is improved, the control is simple, and the reliability is high. It is suitable for aviation low-voltage high-power starter generator system.

Description

technical field [0001] The invention relates to a starting power generation control system, in particular to a high power density high-speed motor DC starting power main power system for an aircraft or an automobile and a corresponding control method, belonging to the technical field of starting power generation. Background technique [0002] In the current DC power supply systems used in aircraft or automobiles, most starter generators are brushed motors. The technology of the brushed motor is mature, and the control of starting and generating power is simple. However, due to the brushes and slip rings in its structure, the brushes are easy to wear and tear, and the average failure maintenance cycle is short. Therefore, the use of power electronic switching devices to replace motor brushes to realize motor current commutation has become a popular direction in the field of motor starting and power generation. [0003] The aerospace field has extremely strict requirements on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P9/08H02P9/30H02M1/08
CPCH02M1/08H02P9/08H02P9/30
Inventor 向子琦赵承亮魏佳丹张卓然杨善水
Owner 南京兴航动力科技有限公司
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