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No-high-frequency-conversion general frequency converter

A frequency converter and high-frequency technology, applied in the field of general frequency converters, can solve problems such as increased failure rates of devices and circuits

Inactive Publication Date: 2012-09-05
郁百超
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

The complexity of circuits, without exception, creates safety and reliability concerns due to increased failure rates of components and circuits

Method used

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  • No-high-frequency-conversion general frequency converter
  • No-high-frequency-conversion general frequency converter
  • No-high-frequency-conversion general frequency converter

Examples

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Embodiment Construction

[0064] Figure 4 It is the principle circuit of general frequency converter without high frequency conversion, Figure 5 It is the simulation waveform of the voltage at each point. Here, we take 2 times frequency as an example (that is, input 50Hz AC voltage, output 100Hz AC voltage) for discussion:

[0065] The 50Hz sine wave input voltage V1 passes through the rectifier bridge composed of D1-D4 and becomes a 100Hz steamed bread wave voltage. MOS tube Q1, high-frequency transformer TX1, resistor R2, etc. form a voltage cutting stage. The working voltage of the drain of Q1 is 100Hz The steamed bun wave voltage Va, the base is added with 100Hz AC voltage and the rectified 200Hz forward steamed wave voltage Vb is passed. The output from the source of Q1 is the remaining waveform after Va is cut by Vb, which is the common part of the two voltages Vc.

[0066] Compensation voltage V3 and resistor R3 form a voltage compensation stage. The voltage compensation stage is actually an auxili...

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Abstract

The invention relates to a no-high-frequency-conversion general frequency converter, which adopts a method of voltage cutting and voltage compensation to realize voltage-frequency conversion and to substitute for an SPWM control technique in a traditional general frequency converter. The method conducts operation to voltage waveform only and contains no high-frequency power conversion except the high-frequency power conversion of an auxiliary power supply. Voltage cutting refers to maintaining the common part of output voltage and input voltage and cutting off the excessive part in the waveform of the input voltage. The voltage compensation refers to compensating the lack part in the waveform of the output voltage to keep the waves of the output voltage to be intact sine waves. The invention has the advantages that the circuit of the frequency converter is simple, the main power device works in the power frequency range, the switching loss and the radio-frequency interference of the entire machine are reduced to be very low, the mean time between failures is greatly increased, the energy is saved, the environment is protected and the safety and the reliability are high.

Description

Technical field [0001] The invention relates to a general frequency converter. Background technique [0002] One of the core technologies of traditional general-purpose inverters is PWM control technology. At first, an analog circuit was used to compare the triangular modulation wave with the reference sine wave to generate a sine pulse width modulation SPWM signal to control the switching of power devices; today, a fully digital solution is used to generate optimized real-time online SPWM control signals. Makes the working mode more flexible and the frequency range wider. PWM control technology still occupies a dominant position in general frequency converters, and has always been a hot spot of research. [0003] With PWM control technology, high frequency conversion must be used. Due to the widespread use of power devices such as MOSFETs and IGBTs and soft switching technologies, the work of power conversion is getting higher and higher, and the structure is more compact, but ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/451
Inventor 郁百超
Owner 郁百超
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