摘要:
A magnetic field-free phase control-type temperature control circuit is disclosed. The magnetic field-free phase control-type temperature control circuit is connected to a heating cable. The heating cable includes first, second, and third wires arranged in parallel with each other, and is configured such that the first wire is used to detect temperature, the second wire and the third wire are connected at the first ends thereof, and current enters through the second wire, makes a U-turn at the first ends thereof, and then exits through the third wire. A temperature signal voltage supply control unit controls the supply of temperature signal voltage. A phase control unit controls the output of the current flowing through the first wire using a phase control method based on a set holding current. A trigger generation unit outputs a trigger signal based on output from the phase control unit.
摘要:
An integrated microfluidic device has a plurality of chambers (11-MN) on a substrate for handling fluids, a chamber circuit (R, Rs, D1, T1, T2, T3, T4) integrated on the substrate for switching signals related to that chamber, and an integrated circuit chip bonded to the substrate, the integrated circuit chip having signal processing circuitry (controller) coupled to the chamber circuit. Lower performance switching functions can be carried out on chamber circuitry implemented in low temperature poly silicon, and higher performance signal processing functions can be carried out on the integrated circuit implemented in crystalline silicon. The substrate can be glass. A controller on the integrated circuit chip can control or read from many chamber circuits in a multiplexed manner, using active matrix techniques. The chambers can be used for PCR and the chamber circuits used for temperature sensing (Rs, D1) and heating (R).
摘要:
Die Erfindung bezieht sich auf ein Heizgerät mit einem schmiegsamen Wärmeteil (10) und einer Steuervorrichtung (1) für die Temperaturregulierung und Funktions überwachung, die eine Sollwertbereitstellungsschaltung (2, 2.8), eine Istwertrückführschaltung (3), einen Soll-/Istwertvergleicher (4) und eine Ansteuerstufe (5) mit einem in einem Heizsteuerkreis (16) liegenden Steuerglied (5.1) für einen durch den Wärmeteil (10) fliessenden Heizstrom (iH) aufweist. Eine nach den Wünschen eines Benutzers variabel regelbare und überwachte Temperatursteuerung wird mit den Massnahmen erreicht, dass ein zu der Sollwertbereitstellungsschaltung (2, 2.8) führender Überwachungszweig (17) zum Bilden von Überwachungszweigsignalen vorhanden ist, die der Sollwertbereitstellungsschaltung (2, 2.8) zur Überlagerung von dieser gebildeter primärer Sollwertsignale und Bildung von an den Soll-/Istwertvergleicher geleiteten Sollwertsignalen über eine Überwachungszweigankopp lung (17.1) zugeführt werden.
摘要:
An improved variable resistor at least partially compensates for non-linearities in an electrical circuit containing a heating element, for example, a thin-film heating element. A controllable heater includes a heating element, a voltage source (for example, a standard AC electrical outlet) coupled to the heating element, and a variable resistor coupled to the heating element and voltage source. The variable resistor includes a fixed resistive element (for example, one or more thin-film resistors) and a moveable element such as a slider control. The moveable element adjustably contacts the fixed resistive element at a contact point associated with the position such that the variable resistor has a resistance that is at least partially non-linearly related to the position, but wherein the heating element has a dissipated power that is at least partially linearly related to the position of the variable resistor. Such a system may be used in conjunction with a vapor-delivery device to provide more linear control over the intensity of fragrance provided within an environment.
摘要:
The temperature of exhaust gas flowing through an exhaust gas passage (3) is estimated or measured and the temperature of an element portion of an exhaust gas sensor (8) (O2 sensor) is controlled through a heater to a desired target temperature using the estimated or measured value. The exhaust gas passage (3) leading to the sensor (8) is partitioned into partial exhaust gas passages (3a-3d), and the exhaust gas temperatures in the partial exhaust gas passages (3a-3d) are estimated in sequence starting with an exhaust port (2) side of an engine (1). The estimation of the exhaust gas temperature is performed based on heat transmission between the exhaust gas and passage-forming members (6a, 6b, 7) of the exhaust gas passage (3) by an algorithm where heat radiation into the air is considered. A control input to the heater at least include a component corresponding to the temperature of the element portion and a component corresponding to the exhaust gas temperature. The temperature of the element portion of the exhaust gas sensor can be controlled stably to a desired temperature even if the exhaust gas temperature changes.
摘要:
A control device (70) is disclosed for controlling a power supply (10) arranged to supply electrical power to a filament (Ra), the temperature of the filament (Ra) being non-linearly dependent on power supplied to the filament (Ra). The control device (70) is arranged to receive temperature control instructions and to control the power supply (60) such that the temperature of the filament (Ra) is controlled in accordance with the instructions. The control device (70) is also arranged to take into account the non-linear relationship between the filament temperature and power input into the filament (Ra) so as to control the filament temperature in accordance with the instructions. The temperature control instructions are a function of a detected change in filament temperature and the control device (70) controls the temperature of the filament (Ra) such that the life of the filament is prolonged.
摘要:
The temperature of a heating element (3), which heating element has a temperature dependent resistance, is measured by comparing the current through the heating element (3) with a user adjustable reference value. The AC voltage over a current sensing resistor (7) in series with the heating element (3) is compared in a comparator (9) with a reference AC voltage generated a tap (6) of a voltage divider (8). The phase of the logic output signal of the comparator (9) indicates a first state in which the heating element (3) is too hot or is not conducting, or a second state in which the heating element (3) is too cold and conducting. A second comparator (16) detects whether or not the heating element (3) is conducting. A logic gate (18) and a latch (17) switch on the current through the heating element (3) in response to timed pulses from a timing circuit (15) and switch off the current through the heating element (3) when the heating element (3) is conducting and too hot.
摘要:
An inexpensive, disposable electric immersion heater is prepared for medical applications using a support layer (9) and an encapsulating layer (35), both of biologically compatible materials, disposed about a generally serpentine heating element (13) that is formed of an electrically resistive material which exhibits a positive temperature coefficient of resistance. The heating element (13) is operated by a power controller which senses the resistance of the heating element (13) to control the level of power supplied thereto. The terminals (15, 17) of the heating element (13) are connected via conductors (21, 23) disposed along an elongated tub (11) to a connector (25) for detachable connection to a controller power source (12). The connector (25) may include a tab (69) that retains coded information, for example, a bar code or a series of holes for optical sensing, thereon of measured parameters of the heating element (13) which may be detected upon insertion of the connector (25) into the receptacle of the controlled power supply (12) to provide programming signals that automatically set the operating parameters within which the power controller of the power supply (12) operates the heating element (13).