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Generating circuit of dead zone control driving signal for field effect transistor

A field-effect transistor and dead-zone control technology, applied in the direction of pulse shaping, etc., can solve the problems of many components, high manufacturing cost, complex signal generation circuit structure, etc., and achieve low cost, excellent low-frequency adaptability, and simple circuit design Effect

Inactive Publication Date: 2010-10-06
MIDEA GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The signal generating circuit of the above-mentioned device has a complex structure, many components are used, and the manufacturing cost is high

Method used

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  • Generating circuit of dead zone control driving signal for field effect transistor
  • Generating circuit of dead zone control driving signal for field effect transistor
  • Generating circuit of dead zone control driving signal for field effect transistor

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Embodiment Construction

[0013] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0014] see figure 1 , a field effect transistor dead-zone control drive signal generation circuit, the voltage-controlled oscillator VCO is connected to the third pin of the pulse width modulation integrated chip TL494, and the ninth and tenth pins of TL494 are used as signal output terminals to communicate with the subsequent drive circuit DRIVER connection. As a signal generating device of TL494, the voltage-controlled oscillator VCO inputs a frequency-variable waveform signal to its third pin. The 5th pin of TL494 is connected in series with a voltage divider circuit, which is composed of a parallel circuit composed of capacitor C1 and resistor R2 and resistor R1 in series. Between the 7th pin and the 12th pin of TL494, there is a parallel connection of capacitor C2 and electrolytic capacitor EC1 to form a filter circuit to filter out clutter signa...

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Abstract

The generating circuit includes voltage-controlled oscillator (VCO) in tandem and subsequent drive circuit DRIVER. Pulse width modulation (PWM) IC circuit is setup between VCO and DRIVER. Being as the signal generation device for PWM IC circuit, VCO inputs a frequency variable waveform signal to PWM IC circuit. Divider circuit and filter circuit are connected to PWM IC circuit. PWM IC circuit is integrated chip TL494. VCO is connected to third pin of TL494; the divider circuit is connected to fifth pin of TL494. The filter circuit is connected in parallel between seventh pin and twelfth pin of TL494. Features are: simple design, flexible and reliable, low cost, and good adaptability for low frequency. The invention is especially suitable to power inversion circuit in electromagnetic furnace, welding equipment in large power, and switching power supply in large power.

Description

technical field [0001] The invention relates to a generation circuit of a dead zone control driving signal of an insulating field effect transistor IGBT or a metal oxide semiconductor field effect transistor MOSFET, in particular to a circuit used for dead zone control in a half-bridge or full-bridge power circuit The generation circuit of the drive signal is used in power conversion circuits such as induction cooker, high-power welding equipment, and high-power switching power supply. Background technique [0002] In the prior art, in a half-bridge or full-bridge frequency conversion power circuit generally composed of IGBTs or MOSFETs, it is necessary to generate two or four output signals (square wave or approximate square wave). Usually, this problem is solved by setting a dedicated chip, but its cost is high and the flexibility of circuit design is poor. There are also high-frequency transformers used to realize this function, but their volume is large, the control is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K5/01
Inventor 毛宏建
Owner MIDEA GRP CO LTD