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Method and circuit for sampling output DC quantity of sine inversion system

A sinusoidal inverter and DC technology, applied in the fields of frequency converters, uninterruptible power supply systems, and inverter power supplies, to achieve the effects of improving sampling accuracy, control accuracy, high resolution, and reducing output DC components

Inactive Publication Date: 2009-01-28
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The technical problem to be solved by the present invention is to propose a sampling method and circuit with higher accuracy and higher signal resolution for the DC output of the inverter system, and to separate the DC component from the sinusoidal inverter output voltage signal and amplify it. Its magnitude, simplifies the circuit and reduces the cost, reduces the DC component for the control of the sinusoidal output inverter power supply system, reduces the complexity of the control technology, improves the accuracy of the control target, and meets the power supply needs of more loads

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  • Method and circuit for sampling output DC quantity of sine inversion system
  • Method and circuit for sampling output DC quantity of sine inversion system
  • Method and circuit for sampling output DC quantity of sine inversion system

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Embodiment Construction

[0038] The technical solution of the present invention will be described in more detail below with reference to the drawings and embodiments.

[0039] The present invention provides a sinusoidal inverter output DC flow sampling circuit, which mainly includes a static DC deviation correction circuit 101 of an operational amplifier, a high-amplitude sinusoidal inverter output voltage resistance-capacitance voltage divider (step-down) circuit 102, and a DC-blocking capacitor terminal voltage directly Flow in-phase amplification and low-pass filter circuit 103, feedback amount adaptation adjustment circuit 104 and signal offset circuit (optional) 105, wherein,

[0040] The static DC offset correction circuit 101 of the operational amplifier is connected to the low-pass filter circuit 103 for in-phase amplification of the DC voltage at the DC blocking capacitor terminal, and is used to correct the static DC offset of the operational amplifier and reduce the offset during static oper...

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Abstract

The present invention provides a sampling circuit and a method for the direct current amount outputted by a sine inversion system. The circuit comprises a high amplitude value sine inversion output voltage capacitive-resistive divider circuit, the input end of which is connected to an output signal of the sine inversion system and is used for reducing the output signal of the sine inversion system to a range required by a controller, and at the same time, reducing the alternating current component in the output signal by a capacitor. The circuit also comprises a blocking capacitor terminal voltage direct current amount in-phase amplification and low-pass filter circuit, which is connected to the high amplitude value sine inversion output voltage capacitive-resistive divider circuit and is used for receiving an output signal of the circuit and amplifying the direct current component in the received output signal. The method comprises a step 120 for shorting the alternating current component in the sine inversion system output signal by the blocking capacitor, and a step 130 for amplifying the direct current component of the blocking capacitor terminal voltage.

Description

technical field [0001] The invention relates to the fields of inverter power supply, frequency converter and uninterruptible power supply system, in particular to a method and circuit for sampling DC components of sinusoidal inverter output. Background technique [0002] In inverters, frequency converters, uninterruptible power systems and other control systems that include inverter circuits, in many cases, the purpose is to convert DC power into single-phase or three-phase AC output to provide loads with stable amplitude. For sinusoidal alternating current, with the development of power electronics technology, semiconductor power electronic devices are constantly being introduced, and the topology of inverter circuits is also constantly developing. High-frequency power supplies, high power density, and low-cost requirements have become basic requirements. Especially in order to reduce the cost and reduce the loss of output power, the output stage of many inverter systems no...

Claims

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Application Information

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IPC IPC(8): H02M7/48
Inventor 张南山
Owner ZTE CORP