SU1412779A1 - Thermostabilizing heating instrument - Google Patents

Abstract

The invention relates to electric heating tools and can be used as a low temperature microplate or in medical technology as a thermostatic regulator. The goal is to improve the accuracy of temperature stabilization and simplify the design of the device. The device contains a thermo-sensitive element, which is a p-p-base-junction transition of the transistor (T), connected in series in the circuits of the first DC source. A second DC source is connected to the device, connected between the emitter and the collector T. Both sources are stabilized current sources. T device- It is used simultaneously as a heat-sensitive and heating element. The current gain factor T in a circuit with a common emitter is temperature dependent. The value of the temperature being stabilized in this case is determined by the ratio of the magnitude of the base and collector currents. To change the stabilized temperature, it is sufficient to change the ratio of the currents generated by the DC sources. 1 il. I (L with

Description

u -1

with

The invention relates to electric instruments and can be used as a low temperature microplate of flax or in a medical technique as a thermal coagulator, i.e. in cases when it is required to ensure high thermal stability with a miniature version of the working member, i The purpose of the invention is to improve the accuracy of temperature stabilization and to eliminate the design of the device, i The drawing shows the block diagram {device.

I The device consists of a temperature-sensitive element, which is a p p junction base-emitter of transistor 1, connected in series in the circuit of the first source of direct current 2. A second DC source 3 is connected to the device, connected between the collector.

thirty

and the emitter of the transistor 1. Both sources are stabilized power sources.

The operation of the thermally stabilized heating tool is based on the physical property of the transistor, the origin of the cems depending on the current gain in the circuit with a common emitter / temperature of pn-junctions. The value of the temperature to be stabilized in this case is determined by the ratio of the milestones of the base Ig and the collector Ifj currents generated by the DC sources 2 and 3.

Indeed, even if the temperature of transistor 1 is such that p-tK. Then the resistance of the circuit will be Lecturer-emitter of transistor 1, when a current drops in a collector circuit I, the collector-emitter voltage will also be large, transistor 1 will start to heat up with an electric power equal to the product of current 1c by the amount of voltage drop. , and the value of the R coefficient begins to increase with increasing temperature. In this way, in the proposed arrangement, transistor 1 is used simultaneously as an insertion and heating element, which makes it possible to simplify the design of a heat-stabilized heating tool. In a number of cases, the tool can also serve as the working body directly of the transistor 1,

45

The device makes it possible to increase the accuracy of temperature stabilization by providing the existing solutions with high accuracy of stabilizing the currents of the DC source 2 and 3 or the ratios of these currents, minimizing the value of the thermal battery between the temperature-sensitive and heating elements.

Claims (1)

Invention Formula A heat stabilizing heater is a tool containing a thermal element scaling element consisting of a pn junction base - emitter of the transistor connected in series in the circuits of the first current source, characterized in that, in order to improve the accuracy of temperature stabilization, A second source was introduced; the same transistor 1 temperature was eaten with such a current that is connected between BE, that} i 7 K, then the resistance of the collector-emitter circuit will be low a collector and an emitter of the transistor, with both current sources being stabilized. and therefore the voltage drop 0 five the collector - emitter and power dissipated by transistor 1 will be close to 0. The transistor will begin to cool due to natural heat transfer to the environment, and fb will decrease as the temperature decreases. The described processes will be repeated until the temperature of transistor 1 becomes such that p K, this temperature will stabilize the proposed device. To change the stabilized temperature, it is enough to change the cooTHomes-5 of the currents Ig and 1, which are formed by the DC sources 2 and 3. Thus, in the proposed device, transistor 1 is used at the same time as a thermal insertion and heating element, which allows to simplify the design of the heat-stabilized heating tool. In a number of cases, the body of the transistor 1 can also serve as a tool working body, 0 0 five The device makes it possible to increase the accuracy of temperature stabilization by allowing existing solutions of high accuracy to stabilize the currents of direct current sources 2 and 3 or the ratio of these currents, minimizing the value of the thermal battery between the temperature-sensitive and heating elements. Invention Formula A heat-stabilizing heating instrument containing a heat-sensitive element, which is a pn junction base-emitter of the transistor, connected in series in the circuits of the first DC source, which, in order to improve the accuracy of temperature stabilization, A second source of alternating current, connected between a collector and an emitter of the transistor, with both current sources being stabilized.