Total harmonic distortion optimization analog multiplier

An analog multiplier and total harmonic distortion technology, applied in analog computers, analog and hybrid computing, instruments, etc., can solve problems such as poor process compatibility, lower system power factor, crossover distortion, etc., and achieve novel and simple circuit structure, The effect of reducing nonlinear distortion and improving power factor

Active Publication Date: 2010-11-03
天健九方(西安)毫米波设计研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, Gilbert unit is mostly used as the analog multiplier. Due to its poor process compatibility, complex control circuit, narrow linear input range, and a certain degree of crossover distortion, it will reduce the power factor of the system. , it is difficult to meet the requirements of integrated circuit development

Method used

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Embodiment Construction

[0025] The present invention will be described in further detail below with reference to the accompanying drawings.

[0026] refer to figure 1 , the present invention comprises a first voltage / current conversion circuit 1, a second voltage / current conversion circuit 2, a third voltage / current conversion circuit 3, a product circuit 4, a current / voltage conversion circuit 5, and a high clamping circuit 6 of an output voltage . Among them: the first voltage / current conversion circuit 1 receives the first input signal MULTIN, and outputs the current signal I after V / I conversion 1 into the product circuit 4; the second voltage / current conversion circuit 2 receives the second input signal COMP, and outputs the current signal I after V / I conversion 2 into the product circuit 4; the third voltage / current conversion circuit 3 receives the first reference voltage signal VREF1, and outputs two current signals I after V / I conversion 3 and I 4 In the product circuit 4; the current si...

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Abstract

The invention discloses a total harmonic distortion optimization analog multiplier, which mainly solves the problems of large crossover distortion and low power factor in the prior art. A first input signal MULTIN, a second input signal COMP and a first reference voltage VPEF1 are converted into four paths of current signals I1 to I4 to a multiplying circuit through three voltage/current conversion circuits respectively; a product circuit performs multiplying and dividing operation on the currents I1 to I4 and outputs a total current IO into the current/voltage conversion circuit; the current/voltage conversion circuit performs I-V conversion on the total current IO output by the product circuit and outputs a voltage product (PRODUCT) into a high clamping circuit of output voltage; and a multiplying signal PRODUCT is highly clamped on a second reference voltage VREF2 through the high clamping circuit of the output voltage. The multiplier realizes multiplying function according to the logarithmic relationship between the voltage VBE between the base and the emitter of a triode and current IC of the collector and can reduce the total harmonic distortion produced by the crossover distortion so as to improve the power factor and be used for an active power factor corrector.

Description

technical field [0001] The invention belongs to the technical field of electronic components, and relates to an analog integrated circuit, in particular to a multiplier used for an active power factor corrector in the design of a switching power supply. Background technique [0002] In the field of switching power supplies, any circuit structure that makes the input grid current non-sinusoidal, or even if it is a sine wave but out of phase with the sinusoidal input voltage, or makes the input current have harmonics will reduce the power factor PF, resulting in power loss. Power Factor Corrector PFC is one of the effective methods to improve the power factor of electronic products and reduce harmonic interference. The analog multiplier is mainly used in the active power factor corrector APFC. It is the core of the APFC circuit. It multiplies the sinusoidal input signal with the output signal of the error amplifier after rectification and voltage division to obtain a rectified...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06G7/161
CPCY02P80/10
Inventor 来新泉王松林王辉刘晨杜鹏飞王安
Owner 天健九方(西安)毫米波设计研究院有限公司
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