CN201167286Y

CN201167286Y - Combined resistance-capacitance absorber of linearity and non-linearity

Info

Publication number: CN201167286Y
Application number: CNU2007201256720U
Authority: CN
Inventors: 黄大可
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-07-26
Filing date: 2007-07-26
Publication date: 2008-12-17
Anticipated expiration: 2017-07-26

Abstract

The utility model provides a linear and nonlinear combined type resistance-capacitance absorber (sees a dotted-line (4) in the attached figure), belonging to the field of electronic technology. The utility model aims to overcome the shortcomings in aspects of protection domain, effectiveness and configuration of a rectifier element in a resistance-capacitance (RC) overvoltage absorption protection circuit, which is normally adopted by a high-power thyristor rectifier. The resistance-capacitance absorber mainly designs the operating frequency of the rectifier and the harmonic frequency of a phase conversion overvoltage by utilizing the frequency selection action of a capacitor (1); and is formed by connecting the energy-consumption components in a circuit with a linear resistor (2) and a nonlinear high-energy voltage-dependent resistor (3) in parallel to form a dynamic resistor network and then connecting with the capacitor (1) in series. The novel resistance-capacitance absorber has good dynamic characteristic and static characteristics, compromises low voltage limiting and low energy consumption, and improves the protection domain and effectiveness of the thyristor rectifier element.

Description

Linear and non-linear combined type rc absorber

Technical field

The utility model is applicable to that the overvoltage of thyristor element in the high-power thyristor rectifier absorbs protection and to the inhibition of high voltage climbing dv/dt.(classification number: H01G17/10, or H03H5/12)

Background technology

In common silicon controlled rectifier; overvoltage protection mode to the thyristor element; mostly be RC resistance capaciting absorpting circuit in parallel; or be aided with non-linear suppression element in rectifier turnover line end; as piezo-resistance etc.; effect of the two and characteristic are separate; be difficult for cooperating; the functional limitation that exists of circuit separately particularly; limit it and suppressed the effect of overvoltage and voltage build-up rate dv/dt; the negative interaction that the heating loss that the effect that perhaps covets but causes increases severely, and the deficiency of mounting structure aspect have all weakened the protective effect to thyristor element itself.

Summary of the invention

At conventional silicon controlled rectifier excess voltage protection; the circuit parameter that exists is single; meaningless loss is bigger; the problem that mounting structure is unreasonable and protection aspects such as effect is not good enough exist; the utility model proposes a kind of novel circuit arrangement; promptly linear and non-linear combined type rc absorber; it has the characteristics of conventional RC resistance-capacitance circuit; the dynamic combined that the pressure limiting performance of non-linear piezo-resistance is arranged again; realized the frequency of thyristor element overvoltage protection and the function of voltage selection; improved validity to the rectifier cell protection; improved mounting means; the adverse effect of having avoided distributed constant to cause has realized good protection assimilation effect.

The technical solution adopted in the utility model is: by the conventional RC resistance-capacitance circuit to the protection silicon controlled rectifier; make corresponding performance Analysis and Calculation; and the running parameter and the performance requirement of cooperation thyristor element; on the basis of the frequency selection of strengthening capacitor (1); linear resistance (2) two ends for resistance-capacitance circuit; a high-energy non-linear piezo-resistance (3) in parallel; form the combined resistance circuit; its pressure sensitive voltage satisfies the maximum working voltage of rectifier cell and leaves remaining; in the hope of solving conventional Resistor-Capacitor Unit parameter fixed single and energy consumption than problems such as height; absorption surge spike and high-octane protective effect have been strengthened; its synthetic protective feature has been taken into account frequency; comprehensive parameters requirements such as voltage and energy capacity; install and also take mounting means compact and nearby, avoided unnecessary circuitous and the adverse effect of distributed constant.

The beneficial effects of the utility model are: it is single to have improved conventional RC resistance capaciting absorpting circuit parameter; the energy consumption height; problems such as weak effect and mounting structure inconvenience; the utility model is at overvoltage of different nature in the work of thyristor rectifier element; adopt linear and non-linear combined type resistance capaciting absorpting circuit (4); selectivity inhibit feature at different frequency and voltage can be arranged; and the equilibrium of energy consumption distributes; greatly reduce the invalid heating loss of linear resistance; it only is about 1/10th of conventional art; the simpler compactness of mounting structure; suppress the superpotential better effects if of rectifier cell, the ability of protection is stronger.Because the cost of capacitor (1) and linear resistance (2) declines to a great extent in the utility model, so total cost can not increase because of having increased nonlinear resistance (3), whole cost performance is very high.

Description of drawings

Accompanying drawing is tie lines schematic diagram of the present utility model, is circuit theory of the present utility model in the frame of broken lines among the figure (4) Structure, linear and Non-linear composite type rc absorber, by (1) frequency-selecting absorption capacitor, (2) linear absorption resistance Device, three elements of (3) non-linear high-energy varistor form, and this overvoltage absorbing circuit (4) directly is parallel to greatly The most direct effective protection is implemented to it in the two ends of power scr rectifier cell.

Embodiment

Because the utility model circuit has adopted the compound composition of element of different qualities parameter; only use three elements for every group; quantity and volume have been reduced; near the installation thyristor rectifier element very easily; theory structure as shown in drawings; respectively by frequency-selecting absorption capacitor (1); the combined resistance in parallel of linear resistor (2) and non-linear high-energy varistor (3); linear and non-linear combined type rc absorber (4) have been constituted; and directly installation nearby is parallel to the rectifier cell two ends; because heating power consumption only is 1/10th of a conventional art; can not cause adverse effect, can effectively promote the protection effect the rectifier heat radiation; every performance index such as mounting means and parameter configuration.

Claims

A kind of linearity and non-linear combined type rc absorber; be that the overvoltage that is connected in parallel on high-power thyristor rectifier cell two ends absorbs protective circuit; it is characterized in that: the frequency by precise design is selected capacitor (1); after dissipative cell linear resistance (2) in the circuit and non-linear high energy ZnO piezo-resistance (3) parallel connection; be in series with capacitor (1) again, constituted the novel rc absorber of dynamic electric resistor network.