Pulse width modulation frequency variable power supply and dead zone compensation method thereof

A variable frequency power supply and pulse width modulation technology, applied in the field of dead zone compensation, can solve problems such as the inability to accurately measure the turn-on time of power switching devices, achieve the effects of improving control effects, increasing sine degree, and solving clamping problems

Active Publication Date: 2011-07-27
SUZHOU INOVANCE TECH CO LTD
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Problems solved by technology

[0012] The technical problem to be solved by the present invention is that for the pulse width modulation variable frequency power supply controlled by directly sampling the pulse width of the output voltage in the prior art, when the current in the switching device is very small, the defect that the actual turn-on ti...

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  • Pulse width modulation frequency variable power supply and dead zone compensation method thereof
  • Pulse width modulation frequency variable power supply and dead zone compensation method thereof
  • Pulse width modulation frequency variable power supply and dead zone compensation method thereof

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Embodiment Construction

[0043] The invention proposes a double comparison point phase voltage feedback dead zone compensation method, which is used for dead zone compensation of PWM (pulse width modulation) wave-emitting frequency conversion equipment. By setting two comparison points, the required compensation amount can be obtained, and the influence of the parasitic capacitance in the switching device on the feedback amount can be eliminated. This method of dead-time compensation relies on the difference in width between the feedback pulse and the desired output pulse.

[0044] Aiming at the pulse width modulation variable frequency power supply controlled by directly sampling the pulse width of the output voltage, by analyzing the problems of the phase voltage feedback when the phase current crosses zero, a double comparison point phase voltage feedback is proposed. Assuming that the current current direction is from the power supply to the load, then the lower bridge arm is turned on during the ...

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Abstract

The invention relates to a pulse width modulation frequency variable power supply and a dead zone compensation method thereof. In the technical scheme, a comparison point level is arranged at the positive and negative semi-periods of a phase current respectively. When an output phase voltage reaches a predetermined value, a feedback signal level actuates to obtain a required compensation amount. The time of the positive and negative semi-periods of the phase current is determined by sampling the phase current, and the comparison point is switched around the positive and negative peaks of the phase current. The method has the following advantages that: the zero-crossing clamping problem of current can be effectively solved and the width of an output pulse can be precisely measured so as to precisely regulate the on/off time of an upper and a lower bridge arm power switching device in an inverter circuit; therefore, a desired output pulse width is obtained, and a current waveform sine degree and a control effect are improved.

Description

technical field [0001] The present invention relates to variable frequency power supply, more specifically, to dead zone compensation of pulse width modulation variable frequency power supply. Background technique [0002] Most voltage source variable frequency power supplies use PWM (Pulse Width Modulation) wave generation technology. Its main circuit topology is: through rectification and capacitor filtering to obtain a DC voltage, and then through the inverter circuit to generate pulse output with adjustable frequency and voltage. For the inverter circuit, each phase of its circuit is composed of two power switching devices with freewheeling diodes connected in series. It is usually called the upper bridge arm connected to the positive pole of the DC power supply, and the lower bridge arm connected to the negative pole. The switching of the power switching device takes a certain amount of time. Therefore, in this topology, in order to avoid the simultaneous conduction of...

Claims

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Application Information

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IPC IPC(8): H02M5/458
Inventor 林喜波
Owner SUZHOU INOVANCE TECH CO LTD
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