PWM (pulse width modulation) based servo system

A pulse width modulation, servo system technology, applied in control systems, AC motor control, electrical components, etc., can solve the problems of noise sensitivity, time drift of analog circuits, etc., to achieve small pulsation, simple circuit, strong noise immunity. Effect

Inactive Publication Date: 2013-03-27
WUXI FORE AUTOMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The analog control circuit has the following defects: the analog circuit is easy to drift with time, will generate some unnecessary heat loss, and is sensitive to noise, etc.

Method used

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  • PWM (pulse width modulation) based servo system
  • PWM (pulse width modulation) based servo system
  • PWM (pulse width modulation) based servo system

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Embodiment Construction

[0009] Below in conjunction with accompanying drawing, the technical scheme realization method of invention is described: figure 1 Among them, a servo system based on PWM pulse width modulation, including triangular wave generator, pulse width modulation circuit, D / A input channel, speed feedforward, drive amplifier circuit and actuator; triangular wave generator, D / A input channel, speed The output end of the feedforward is connected with the input end of the pulse width modulation circuit, the output end of the pulse width modulation circuit is connected with the input end of the drive amplifier circuit, and the output end of the drive amplifier circuit is connected with the input end of the torque motor. Specifically, it includes triangular wave generator, pulse width modulation circuit, D / A input channel, speed feedforward, drive amplifier circuit and actuator; triangular wave generator, D / A input channel, output terminal of speed feedforward and pulse width modulation The...

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Abstract

The invention discloses a PWM (pulse width modulation) based servo system which comprises a triangular wave generator, a pulse width modulation circuit, a D/A (digital/analog) input passage, a speed feed-forward unit, a drive amplifying circuit and an actuating mechanism. Output ends of the triangular wave generator, the D/A input passage and the speed feed-forward unit are connected with an input end of the pulse width modulation circuit, an output end of the pulse width modulation circuit is connected with an input end of the drive amplifying circuit, and an output end of the drive amplifying circuit is connected with an input end of a torque motor. The PWM based servo system has the advantages that the quality of devices of the system is small, and the system is simple in principle, high in reliability and universality, and can be applied to various power control systems widely.

Description

technical field [0001] The invention relates to a servo system based on PWM pulse width modulation, in particular to a servo system based on PWM pulse width modulation, belonging to the field of PWM technology. Background technique [0002] Pulse Width Modulation (PWM: PUlse Width Modulation) is a very effective technology that uses the digital output of a microprocessor to control analog circuits, and is widely used in many fields from measurement, communication to power control and conversion. PWM control technology has always been one of the core technologies of frequency conversion technology. In 1964, A.Schonung and H.stemmler first proposed to apply this technology to AC drives. Since then, it has opened up a new situation for the promotion and application of AC drives, starting from the initial use of analog circuits to complete the comparison of triangular modulation waves and reference sine waves, and to generate sinusoidal pulse width modulation SPWM signals to co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/08
Inventor 钱国东
Owner WUXI FORE AUTOMATION TECH
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