DE20107149U1 - Temperature measuring circuit for injection molding machines - Google Patents

Temperature measuring circuit for injection molding machines

Info

Publication number
DE20107149U1
DE20107149U1 DE20107149U DE20107149U DE20107149U1 DE 20107149 U1 DE20107149 U1 DE 20107149U1 DE 20107149 U DE20107149 U DE 20107149U DE 20107149 U DE20107149 U DE 20107149U DE 20107149 U1 DE20107149 U1 DE 20107149U1
Authority
DE
Germany
Prior art keywords
circuit
adc
output
input
analog switch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
DE20107149U
Other languages
German (de)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens Numerical Control Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Numerical Control Ltd filed Critical Siemens Numerical Control Ltd
Publication of DE20107149U1 publication Critical patent/DE20107149U1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/02—Means for indicating or recording specially adapted for thermometers
    • G01K1/026—Means for indicating or recording specially adapted for thermometers arrangements for monitoring a plurality of temperatures, e.g. by multiplexing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
    • G01K7/021—Particular circuit arrangements
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1927—Control of temperature characterised by the use of electric means using a plurality of sensors
    • G05D23/193—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces
    • G05D23/1931—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces to control the temperature of one space

Description

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßtThe description text was not recorded electronically

Claims (3)

1. Temperaturmessschaltung, insbesondere für Spritzgussma­ schinen, dadurch gekennzeichnet, dass die Schaltung beinhaltet:
  • - mehrere Thermosensoren, die jeweils mit einem zu messenden Gegenstand verbunden sind und durch die Induzierung der Temperatur des Gegenstandes ein Spannungssignal des Thermo­ sensors, das der Temperatur jeweils proportional ist, aus­ geben;
  • - mehrere RC-Eingangsfilter (R1C1-R15C15), die eingangsseitig jeweils mit den Ausgängen der Thermosensoren verbunden sind, die Spannungssignale der Thermosensoren empfangen und filtern, so dass Gleichtaktstörungen auf den Thermosensor­ leitungen unterdrückt sind;
  • - einen vielkanaligen Analogschalter (MAX 337), der eingangs­ seitig jeweils mit einer Ausgangsseite der oben genannten RC-Eingangsfilter verbunden ist, und die Spannungssignale der Thermosensoren vielkanalig umschaltet;
  • - einen Differentialverstärker (AD7705), der eingangsseitig mit der Ausgangsseite des oben genannten vielkanaligen Ana­ logschalters (MAX 337) verbunden ist, und das vom vielkana­ ligen Analogschalter umgeschalteten Signal differentiell verstärkt;
  • - einen Analog-Digital-Umwandler ADC, der eingangsseitig mit der Ausgangsseite des oben genannten Differentialverstär­ kers verbunden ist, und das vom oben genannten Differenti­ alverstärker verstärkte Analogsignal zu einem Digitalsignal umwandelt;
  • - einen digitalen Sperrkreis vom 50 Hz/60 Hz, der eingangssei­ tig mit der Ausgangsseite des oben genannten ADC verbunden ist, um die Gleichtaktstörungen vom Netz zu unterdrücken;
  • - eine CPU, die mit dem vielkanaligen Analogschalter (MAX 337) verbunden ist, um eine Adressenauswahl des vielkanali­ gen Analogschalters durchzuführen, wobei der Dateneingang- /ausgang und ein Teil der Steuerungsanschlüsse der CPU mit den Eingangs-/Ausgangsanschlüssen des ADC und des digitalen Sperrkreises von 50 Hz/60 Hz verbunden sind, um die vom ADC umgewandelten digitalen Signale zu empfangen und den Betrieb vom ADC und vom 50 Hz/60 Hz digitalen Sperrkreis zu steuern.
1. Temperature measuring circuit, in particular for injection molding machines, characterized in that the circuit includes:
  • - Several thermal sensors, each of which is connected to an object to be measured and, by inducing the temperature of the object, give a voltage signal from the thermal sensor, which is proportional to the temperature;
  • - Several RC input filters (R 1 C 1 -R 15 C 15 ), which are connected on the input side to the outputs of the thermal sensors, receive and filter the voltage signals from the thermal sensors so that common-mode interference on the thermal sensor lines are suppressed;
  • - A multi-channel analog switch (MAX 337 ), which is connected on the input side to an output side of the above-mentioned RC input filter, and switches the voltage signals of the thermal sensors multi-channel;
  • - A differential amplifier (AD7705), which is connected on the input side to the output side of the above-mentioned multi-channel analog switch (MAX 337 ), and amplifies the signal switched by the multi-channel analog switch differentially;
  • - An analog-to-digital converter ADC, which is connected on the input side to the output side of the above-mentioned differential amplifier, and converts the analog signal amplified by the above-mentioned differential amplifier to a digital signal;
  • - A digital blocking circuit of 50 Hz / 60 Hz, the input side is connected to the output side of the above ADC to suppress the common mode interference from the network;
  • - A CPU connected to the multichannel analog switch (MAX 337 ) to perform address selection of the multichannel analog switch, with the data input / output and part of the control connections of the CPU with the input / output connections of the ADC and the digital blocking circuit of 50 Hz / 60 Hz are connected to receive the digital signals converted by the ADC and to control the operation of the ADC and the 50 Hz / 60 Hz digital blocking circuit.
2. Temperaturmessschaltung nach Anspruch 1, dadurch gekennzeichnet, dass die Schaltung eine Schaltung zur Nullpunktkompensation aufweist, die aus einer Bezugsspannungsschaltung und einem ADC besteht, wobei der Ausgang für die Nullpunktkompensation der Bezugsspannungs­ schaltung mit einem Eingang des ADC verbunden ist, um den ADC mit einem Signal zur Nullpunktkompensation des Thermosensors, das der Umgebungstemperatur proportional ist, zu versorgen.2. Temperature measuring circuit according to claim 1, characterized characterized that the circuit is a Circuit for zero point compensation, which consists of a Reference voltage circuit and an ADC, the Output for zero point compensation of the reference voltage circuit connected to an input of the ADC to the ADC with a signal for zero point compensation of the thermal sensor, that is proportional to the ambient temperature. 3. Temperaturmessschaltung nach Anspruch 1, dadurch gekennzeichnet, dass die Schaltung eine Schaltung zur Leitungsbruchüberprüfung der Thermosensoren und zur Alarmierung aufweist, die jeweils ein Relais (K), einen ersten Widerstand und mehrere zweiten Widerstände umfasst, wobei ein Anschluss des Relais (K) mit der Stromquelle ver­ bunden ist, und der andere Anschluss des Relais (K) mit dem ersten Widerstand verbunden ist, wobei der andere Anschluss des ersten Widerstands mit dem Gleichtaktausgang des vielka­ naligen Analogschalters (MAX 337) verbunden ist, wobei die Anzahl der zweiten Widerstände gleich der Zahl des Thermosen­ soren ist, und die zweiten Widerstände jeweils zwischen die Ausgänge der Thermosensoren geschaltet sind, wobei durch den Vergleich der Ausgangsspannung des Differentialverstärkers mit einer Schwellenspannung, wenn das Relais (K) eingeschal­ tet ist, detektierbar ist, ob der Thermosensor ausgefallen ist oder nicht, und sobald ein Bruch der Thermosensorleitung gefunden ist, durch die CPU ein Alarmsignal ausgebbar ist, durch welches unverzüglich der Strom des Heizgerätes aus­ schaltbar ist.3. Temperature measuring circuit according to claim 1, characterized in that the circuit has a circuit for line break check of the thermal sensors and for alarming, each comprising a relay (K), a first resistor and a plurality of second resistors, with a connection of the relay (K) with the power source is connected, and the other terminal of the relay (K) is connected to the first resistor, the other terminal of the first resistor being connected to the common mode output of the multichannel analog switch (MAX 337 ), the number of second resistors being equal the number of thermos sensors, and the second resistors are each connected between the outputs of the thermosensors, it being possible to detect whether the thermosensor has failed by comparing the output voltage of the differential amplifier with a threshold voltage when the relay (K) is switched on or not, and as soon as a break in the thermosensor line is found, an alarm signal can be issued by the CPU, through which the current of the heater can be switched off immediately.
DE20107149U 2000-04-30 2001-04-25 Temperature measuring circuit for injection molding machines Expired - Lifetime DE20107149U1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN00207066U CN2426143Y (en) 2000-04-30 2000-04-30 Temp. measuring circuit in plastics ejection moulding machine

Publications (1)

Publication Number Publication Date
DE20107149U1 true DE20107149U1 (en) 2001-07-05

Family

ID=4603140

Family Applications (1)

Application Number Title Priority Date Filing Date
DE20107149U Expired - Lifetime DE20107149U1 (en) 2000-04-30 2001-04-25 Temperature measuring circuit for injection molding machines

Country Status (2)

Country Link
CN (1) CN2426143Y (en)
DE (1) DE20107149U1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103439022A (en) * 2013-08-02 2013-12-11 杭州电子科技大学 Temperature detecting circuit for household garbage waste plastic cleavage reaction
CN104571202A (en) * 2015-01-05 2015-04-29 杭州电子科技大学 ARM-based temperature collection control system and method

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101231318B (en) * 2007-07-31 2012-01-25 艾默生网络能源有限公司 Voltage sampling circuit of anti-syntype diverter
US8228068B2 (en) 2008-05-02 2012-07-24 Siemens Aktiengesellschaft Systems and methods for detecting wire breaks
US8485724B2 (en) * 2010-03-31 2013-07-16 Microchip Technology Incorporated Thermocouple electromotive force voltage to temperature converter with integrated cold-junction compensation and linearization
KR20120098061A (en) * 2011-02-28 2012-09-05 엘에스산전 주식회사 Temperature estimation apparatus and method in thermocoupler input module of plc
CN104913857A (en) * 2014-03-14 2015-09-16 西南科技大学 Multi-path K-type thermocouple signal acquisition method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103439022A (en) * 2013-08-02 2013-12-11 杭州电子科技大学 Temperature detecting circuit for household garbage waste plastic cleavage reaction
CN103439022B (en) * 2013-08-02 2015-08-12 杭州电子科技大学 The temperature sensing circuit of house refuse cracking waste plastics reaction
CN104571202A (en) * 2015-01-05 2015-04-29 杭州电子科技大学 ARM-based temperature collection control system and method

Also Published As

Publication number Publication date
CN2426143Y (en) 2001-04-04

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Legal Events

Date Code Title Description
R207 Utility model specification

Effective date: 20010809

R081 Change of applicant/patentee

Owner name: SIEMENS AKTIENGESELLSCHAFT, DE

Free format text: FORMER OWNER: SIEMENS NUMERICAL CONTROL LTD., JIANGSU, CN

Effective date: 20020816

R150 Term of protection extended to 6 years

Effective date: 20040729

R157 Lapse of ip right after 6 years

Effective date: 20071101