Temperature control systems
阅读：245发布：2022-01-14
专利汇可以提供Temperature control systems专利检索，专利查询，专利分析的服务。并且Temperature control systems or regulating circuits for use with electrical heating elements of burners of electric ranges, hot plates or cook-tops, such circuits and elements being directly energized from conventional or commercial sources of power, such as 60 c.p.s. alternating current sources of 120 or 240 volts, and which systems provide high-temperature sensing and adequate temperature-limiting. An encapsulated high-temperature wire sensor is used in conjunction with thermal or electromagnetically actuated devices or relays, and solid state circuitry comprising a balanced amplifier-detector and at least one silicon controlled rectifier as a switch or switching device. The necessity for a step-down transformer is eliminated by the systems disclosed and an economic advantage is thereby attained. The control systems are especially suitable for use with electrically heated glassceramic cook-tops in order to provide higher temperatures and improved cooking performance when cooking vessels with non-flat bottoms are used with such cook-tops, while at the same time providing temperature-limiting of the burner system of the cooktops for both electric heating-element protection and cook-top protection.，下面是Temperature control systems专利的具体信息内容。
1. A temperature control system for energizing an electrical resistance heating element from a conventional commercial source of alternating current and regulating the temperature of such heating element to maintain such temperature at or near a selected set-point temperature therefor, such system comprising, in combination; I. a Wheatstone-type bridge circuit including, a. a wire having a relatively high temperature coefficient of electrical resistance disposed in thermal transfer relationship with said heating element and forming a first arm of said bridge circuit, b. adjustable electrical resistance means forming a second arm of said bridge circuit adjacent said first arm and for selecting said set-point temperature, and c. variable electrical resistance means forming third and fourth adjacent arms of said bridge circuit and for calibration thereof; II. a differential switching amplifier including a pair of first and second similar transistors having their emitters connected with each other; III. first electrical resistance means connecting the base of said first transistor with the junction of said first and second arms of said bridge circuit; IV. second electrical resistance means connecting the base of said second transistor with the junction of said third and fourth arms of said bridge circuit; V. third electrical resistance means connecting said emitters with the junction of said second and third arms of said bridge circuit; VI. fourth and fifth electrical resistance means connecting the collectors of said first and second transistors, respectively, with the bases of the second and first transistors, respectively; VII. sixth and seventh electrical resistance meanS connecting the collectors of said first and second transistors, respectively, with the junction of said first and fourth arms of said bridge circuit and with one terminal of said alternating current source; VIII. a silicon-controlled rectifier having its cathode connected with said one terminal of said alternating current source and its control electrode connected through electrical resistance means with the collector of said second transistor; IX. a variable electrical resistance connecting the junction of said second and third arms of said bridge circuit with the anode of said rectifier; X. an electrically actuated switch having a control winding and normally closed electrical circuit controlling contacts actuable to open when said control winding is energized through said rectifier; XI an electrical asymmetric unit; XII. first series circuit means connecting the anode of said rectifier with a second terminal of said alternating current source, such circuit means including in series said control winding and said asymmetric unit with the low resistance direction of such unit being in a direction from said second terminal of the alternating current source towards said anode; and XIII. second series circuit means connecting said heating element through said electrical circuit controlling contacts across said source of alternating current.
2. A temperature control system in accordance with claim 1 and in which said electrically actuated switch is an electromagnetic type relay.
3. A temperature control system in accordance with claim 1 and in which said electrically actuated switch is a thermal-type relay having a control winding which is heated by electrical current to actuate said electrical circuit controlling contacts to open.
4. A temperature control system in accordance with claim 3 and further comprising eighth electrical resistance means included in series in said first series circuit means when said electrical circuit controlling contacts of said relay are open.
5. A temperature control system for energizing an electrical resistance heating element from a conventional commercial source of alternating current and regulating the temperature of such heating element to maintain such temperature at or near a selected set-point temperature therefor, such system comprising, in combination; I. a Wheatstone-type bridge circuit including, a. a wire having a relatively high temperature coefficient of electrical resistance disposed in thermal transfer relationship with said heating element and forming a first arm of said bridge circuit, b. adjustable electrical resistance means forming a second arm of said bridge circuit adjacent said first arm and for selecting said set-point temperature, and c. variable electrical resistance means forming third and fourth adjacent arms of said bridge circuit and for calibration thereof; II. a differential switching amplifier including a pair of first and second similar transistors having their emitters connected with each other; III. first electrical resistance means connecting the base of said first transistor with the junction of said first and second arms of said bridge circuit; IV. second electrical resistance means connecting the base of said second transistor with the junction of said third and fourth arms of said bridge circuit; V. third electrical resistance means connecting said emitters with the junction of said second and third arms of said bridge circuit; VI. fourth and fifth electrical resistance means connecting the collectors of said first and second transistors respectively, with the bases of the second and first transistors, respectively; VII. sixth and seventh electrical resistance means connecting the collectors of said first and second transistors, respectively, with the junction of said first and fourth arms of said bridge circuit and with one terminal of said alternating current source; VIII. a silicon-cOntrolled rectifier having its cathode connected with said one terminal of said alternating current source and its control electrode connected through electrical resistance means with the collector of said second transistor; IX. a variable electrical resistance connecting the junction of said second and third arms of said bridge circuit with the anode of said rectifier; X. an electrically actuated switch having a control winding and electrical circuit controlling contacts actuable from electrical circuit closing to opening conditions; XI. first circuit means for supplying half-cycles of alternating current from a second terminal of said current source through said control winding to said anode of said rectifier; and XII. second circuit means connecting said heating element through said electrical circuit controlling contacts across said alternating current source to energize such heating element for heating thereof when such contacts are closed.
6. A temperature control system in accordance with claim 5 and in which said electrically actuated switch is an electromagnetic type relay.
7. A temperature control system in accordance with claim 5 and in which said electrically actuated switch is a thermal-type relay having a control winding which is heated by electrical current to actuate said electrical circuit controlling contacts to open.
8. A temperature control system in accordance with claim 7 and further comprising eighth electrical resistance means included in series in said first circuit means when said electrical circuit controlling contacts of said relay are open.
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