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Brushless direct-current generator controllable rectification method

A DC generator and rectifier technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc. The effect of dosage, operating speed range expansion, high efficiency

Inactive Publication Date: 2014-06-04
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method will cause the generator back EMF to be lower. If the traditional diode rectification method is used, the capacity of low-speed power generation will be reduced.

Method used

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  • Brushless direct-current generator controllable rectification method
  • Brushless direct-current generator controllable rectification method
  • Brushless direct-current generator controllable rectification method

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Experimental program
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Effect test

Embodiment Construction

[0029] figure 1 Shown is the block diagram of the controllable rectification system of the brushless DC generator, which consists of three parts: motor 1, rectifier 2 and controller 3. in:

[0030] The motor 1 is a permanent magnet brushless DC generator, designed according to the DC voltage standard specified by the high speed output.

[0031] The rectifier 2 is a kind of six fully controlled switching elements 11-16 (S 1 -S 6 ), the three-phase bridge consists of three parallel branches, and each of the three branches is composed of two fully-controlled switching elements connected in series. The first branch Switching element 11 in the way (S 1 ) with switching element 12 (S 2 ) in series, the switching element 13 in the second branch (S 3 ) with switching element 14 (S 4 ) in series, the switching element 15 in the third branch (S 5 ) with switching element 16 (S 6 ) in series. Among them, two parallel nodes in the three branches respectively lead out a connectio...

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Abstract

Provided is a brushless direct-current generator controllable rectification method. A brushless direct-current generator control system comprises a motor, a rectifier and a controller. The rectifier is a three-phase bridge comprising six full-control-type switch elements. Each full-control-type switch element is reversely connected in parallel with a diode. A direct-current side of the three-phase bridge is connected in parallel with a capacitor and a load, and an alternating-current side is connected with a three-phase winding of the motor. The controller comprises a phase current selecting unit, a direct-current voltage adjuster, a phase current adjuster and a PWM generator. The controller obtains the current position of a rotor, direct-current voltages and phase current information according to three channels of input signals, six channels of control signals are output, connecting and disconnecting of the six full-control-type switch elements of the rectifier are controlled, energy storing and releasing in an inner inductor of the motor winding are controlled to stabilize direct-current voltages. Compared with a diode rectification mode, the low-speed power generating capacity of a direct-current generator can be expanded, the speed operation range of the generator is expanded, and the output power capacity of the generator is improved.

Description

technical field [0001] The invention relates to a control method of a brushless DC generator, in particular to a controllable rectification method of the brushless DC generator, which can improve the power generation capacity compared with the traditional diode uncontrolled rectification method. The invention is suitable for vehicles, and can expand the speed range of the brushless DC generator supplying power to vehicle-mounted electrical equipment and energy storage elements. Background technique [0002] When the vehicle generator is generating power, it supplies power to the vehicle electrical equipment and the energy storage unit. In "QC / T729-2005", the technical standards of automotive alternators are specified in detail, such as: wide speed power generation range from 1000 to 10000r / min; steady-state DC voltage fluctuation range within 0.3V and other indicators. [0003] The traditional claw pole generator has the characteristics of simple structure and low cost, so ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/217
Inventor 许家群蒋杰杜怀颖
Owner BEIJING UNIV OF TECH
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