CN2279641Y

CN2279641Y - Silicon carbide rod heating automatic control temperature controlling instrument

Info

Publication number: CN2279641Y
Application number: CN 96204972
Authority: CN
Inventors: 于增华; 邹州传; 于春甫
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-03-21
Filing date: 1996-03-21
Publication date: 1998-04-22
Anticipated expiration: 2006-03-21

Abstract

The utility model relates to a temperature controlling device, particularly a temperature controlling device with silicon carbide rod heating automatic control. The utility model comprises a digital temperature display controller and a controlled silicon constant current source. The digital temperature display controller is composed of a temperature /voltage conversion amplification circuit [1], a comparator [2], a controller [3], a power supply [4], a 31/2UP301 digital display [5], a temperature setting circuit 6, and a temperature control trigger circuit 7. The controlled silicon constant current source is composed of a silicon carbide rod heater [21], a rectification circuit [22], a current detecting circuit [23], a controlled silicon constant current control circuit [24], a direct current voltage amplification circuit [25], a negative feedback circuit [26], and a transformer [27]. The utility model protects the silicon carbide rod and extends the service life of the silicon carbide rod; furthermore, the utility model achieves the purpose of man power and energy saving, with self control of temperature and safe and convenient use.

Description

The Elema heating is the control temperature controller automatically

The utility model relates to a kind of temperature controller, and particularly a kind of Elema heating is the control temperature controller automatically.

The control procedure of present existing temperature controller is mainly by artificial hand adjustment, and can not constant current, and electric current is greatly not little, and poor stability burns out equipment easily.

The purpose of this utility model is for a kind of Elema that adopts original creation galvanostat of heating is provided, and the protection Elema also makes it increase serviceable life, saves the manpower and the energy, keeps the good Elema heating of the security of constant current control temperature controller automatically.

The purpose of this utility model realizes by following technical scheme.Get ready by temperature/voltage and change the control amplifying circuit, comparer, controller, power supply, the 31/2UP301 numeral shows, temperature setting circuit, the digital temperature display controller that the temperature control triggering electric circuit constitutes and by elema heater, rectification circuit, current detection circuit, the controllable silicon constant-current control circuit, the DC voltage amplifying circuit, negative-feedback circuit, the controllable silicon constant current source that transformer etc. are formed, the temperature control triggering electric circuit of digital temperature display controller and the rectification circuit of controllable silicon constant current source and controllable silicon constant-current control circuit link, rectification circuit and controllable silicon constant-current control circuit, link with elema heater respectively, elema heater and current detection circuit link, current detection circuit and negative-feedback circuit link, negative-feedback circuit and DC voltage amplifying circuit link, DC voltage amplifier is connected with the controllable silicon constant-current control circuit, promptly constitutes Elema heating control temperature controller automatically.

It is as follows that silicon rectification bridge of the present utility model and SCR controllable silicon require reverse voltage or operating voltage to add the safety coefficient formula in the working voltage scope: working voltage scope XN 2, commutated current or Control current are greater than 2 times of institute's usable range.

The utility model is that total digitalization shows; SCR control is non-contact type control; owing on temperature demonstration and control basis, increased Elema controllable silicon constant-current source circuit again; thereby prevented from the energising heating process to cause that the excessive variation of electric current causes the Elema overload to blow or shortens the life-span because resistance value changes significantly; both protected the silicon electrical carbon and made it increase serviceable life; reach the purpose of saving the manpower and the energy again, temperature automatically controlled, safe and reliable convenience.

Below in conjunction with drawings and Examples utility model is described in further detail:

Fig. 1 is the utility model structured flowchart

Fig. 2 is the utility model circuit theory diagrams

With reference to Fig. 1, Fig. 2, get ready by temperature/voltage converter amplifier circuit 1, comparer 2, controller 3, power supply 4, the 31/2UP301 numeral shows 5, temperature setting circuit 6, the digital temperature display controller that temperature control triggering electric circuit 7 constitutes and by elema heater 21, rectification circuit 22, current detection circuit 23, controllable silicon constant-current control circuit 24, DC voltage amplifying circuit 25, negative-feedback circuit 26, the controllable silicon constant current source that transformer 27 is formed, the temperature control triggering electric circuit 7 of digital temperature display controller links with the rectification circuit 22 and the controllable silicon constant-current control circuit 24 of controllable silicon constant current source, rectification circuit 22 and controllable silicon constant-current control circuit 24 link with elema heater 21 respectively, elema heater 21 links with current detection circuit 23, current detection circuit 23 links with negative-feedback circuit 26, negative anti-erosion circuit 26 links with DC voltage amplifying circuit 25, DC voltage amplifying circuit 25 links with controllable silicon constant-current control circuit 24, promptly constitutes Elema heating control temperature controller automatically.

It is as follows that the utility model silicon rectification bridge and SCR controllable silicon require reverse voltage or operating voltage to add the safety coefficient formula in the working voltage scope: working voltage scope XN 2, commutated current or Control current are greater than 2 times of institute's usable range.

When Elema was connected AC power work, main circuit had electric current to pass through, and detected the anti-negative-feedback circuit of delivering to through mutual inductor and gave and mix up required size of current earlier, and the constant current source size is also just fixing.If electric current is excessive, the load R23 both end voltage of testing circuit LH raises (controlling by the WS adjusting), through D12, and the D13 rectification, the d. c. voltage signal after 17 filtering of resistance R 32 capacitor C on C17 also increases.After resistance R 30 and W5 dividing potential drop, be added to the BG2 base stage, this moment, base voltage raise, collector voltage descends, therefore reduce to the C14 charging current by R27, the C14 charging voltage gathers way slack-off, and BG3 is increased at interval to the trigger pulse that SCR sends, thereby the thyristor operating angle degree reduces to force main circuit current to descend.It is opposite with above-mentioned principle of work when main circuit current reduces.

Temperature/voltage converter amplifier circuit 1 is to use the small signal amplifying circuit; Comparer 2 is that the thermoelectrical potential that setting voltage and thermopair are produced compares; Controller 3 and temperature control triggering electric circuit 7 are produced by the integrator of controller and to be shaped to trigger pulse through amplifier again after temperature signal voltage that sawtooth voltage and comparer come is added and subtracted, again through photoelectricity Coupling Control controllable silicon; The characteristics of elema heater 21 are that cold-state resistance is little, and 800 ℃ is the resistance saturation point, and during to 1300 ℃, resistance is to rise with temperature to descend; Rectification circuit 22 is that rectifier bridge is universal; Form controllable silicon constant current part by current detection circuit 23, controllable silicon constant-current control circuit 24, DC voltage amplifying circuit 25 and negative-feedback circuit 26, when energized at the beginning, because Elema resistance is little, and is very big by electric current, this big electric current is obtained signal voltage through the LH mutual inductor through D12, D13 reduces trigger pulse through G2 amplification control G3, controlled true angle is little, electric current reduces, and the LH mutual voltage diminishes, and G2 amplifies and diminishes, the G3 trigger pulse increases, and the controllable silicon electric current increases; Because the W5 output voltage mixes up in advance, so the silicon controlled electric current is to set up well, the characteristics of its energy accommodate silicon carbon-point.

Claims

1. temperature controller is controlled in an Elema heating automatically, comprise by temperature/voltage converter amplifier circuit [1], comparer [2], controller [3], power supply [4], the 31/2UP301 numeral shows [5], temperature setting circuit [6], the temperature display controller that temperature control triggering electric circuit [7] constitutes, it is characterized in that the automatic control of described Elema heating temperature controller also comprises by elema heater [21], rectification circuit [22], current detection circuit [23], controllable silicon constant-current control circuit [24], DC voltage amplifying circuit [25], negative anti-erosion circuit [26], the controllable silicon constant current source that transformer [27] is formed, the temperature control triggering electric circuit [1] of digital temperature display controller links with the rectification circuit [22] of controllable silicon constant current source and controllable silicon constant-current control circuit [24], and rectification circuit [22] and controllable silicon constant-current control circuit [24] link with elema heater [21] respectively; Elema heater [21] links with current detection circuit [23], current detection circuit [23] links with negative anti-erosion circuit [26], negative-feedback circuit [26] links with DC voltage amplifying circuit [25], and DC voltage amplifying circuit [25] links with controllable silicon constant-current control circuit [24].