Compensation method used for pulse width modulation conversion technique dead angle

A technology of pulse width modulation and frequency conversion technology, which is applied in the direction of control system, DC motor speed/torque control, electrical components, etc.

Inactive Publication Date: 2005-11-30
严格集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the defect that the existing dead zone compensation method only compensates for the dead zone that has occurred, a dead zone compensation method that can avoid the dead zone is provided

Method used

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  • Compensation method used for pulse width modulation conversion technique dead angle
  • Compensation method used for pulse width modulation conversion technique dead angle
  • Compensation method used for pulse width modulation conversion technique dead angle

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Embodiment Construction

[0005] Combining Figure 1 and Figure 6 This method will be specifically described. It is realized through the following steps: 1. Use the first current detection resistor R1 and the second current detection resistor R2 connected in series in the U-phase winding and V-phase winding loops of the motor 1 to respectively detect the U-phase current signal I1 and V-phase current signal I2; 2. Filter and amplify the U-phase current signal I1 and V-phase current signal I2 respectively through the first filtering and amplifying circuit 2-1 and the second filtering and amplifying circuit 2-2 to obtain the first analog quantity One signal X1, the second signal X2 of the analog quantity; Three, respectively use the first analog / digital converter 3-1 and the second analog / digital converter 3-2 to convert the first signal X1 of the analog quantity, the second signal X1 of the analog quantity The second signal X2 is converted into the first signal X1' of the digital quantity and the second...

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Abstract

The method is implemented through following procedures. First, current signals in each phase are measured, and analog current signals are converted to digital signals. Next, based on direction of current, computer program determines power device is valid or invalid. Then, normal driving signals not containing dead region are sent to valid components, and non-signal is sent to invalid components. Thus, issue of dead region is avoided. Performances of PWM unit are improved. The method does not need to do calculation, and does need to send out driving signals based on determination of current direction. The method provides features of simple, reliable, easy of implementation, lowered switching loss and increased efficiency of inverter.

Description

Technical field: [0001] The invention relates to a dead zone compensation method used in pulse width modulation frequency conversion technology, which can be used in power electronic devices such as motor drive systems and power supplies using PWM (pulse width modulation) technology. Background technique: [0002] At present, PWM (that is, pulse width modulation) technology has become a necessary technology for variable frequency speed regulation motor drive systems. The performance of the PWM drive unit combined with PWM technology and inverter directly determines the performance of the motor system. An important issue in the practical application of PWM is the compensation of the dead zone. The dead zone has a significant impact on the performance of the PWM, and its impact on the PWM output voltage is manifold. The deviation voltage formed by the dead zone makes the fundamental wave voltage actually output by the PWM different from the ideal situation in phase and ampli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
Inventor 徐殿国史敬灼刘汉奎马洪飞贵献国王毅
Owner 严格集团股份有限公司
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