SU864262A1 - Temperature contro - Google Patents

Description

(54) TEMPERATURE REGULATOR

I

The invention relates to automation and is intended to control the temperature in various objects.

A temperature controller is known, which contains two contact sensors, a transformer, an executive relay and a trinistor, the control electrode of which is connected to its cathode via a first contact sensor, in parallel with which are connected sequentially disconnecting relay contact and the second contact sensor l.

The disadvantages of such a regulator are the need to use two contact sensors and the lack of reliability in operation due to the large number of contacts in the control circuit of the triristor electrode.

Also known is a temperature controller containing a thermal contact, an executive relay, a transformer, a triac, the anode of which is connected to the first end of the primary winding of the transformer through the winding of the executive relay, the control electrode of the triac is connected to the secondary winding of the transformer, the second end of which is connected to the cathode of the triac and between The thermistor contactor f 2 J is turned on by the driving electrode of the triac and its cathode.

However, this regulator is not reliable enough in operation, since it does not have ambiguity zone, which leads to unnecessarily frequent switching on of electromagnetic relays and other actuators (heating elements, electric motors, etc.) and their premature failure.

Claims (1)

Closest to the present invention is a temperature controller containing a triac, a transformer connected to an alternating voltage source, a thermal contact connected in parallel with a control electrode-cathode of the triac and a secondary winding of a transformer, an executive relay connected between the anode of the triac and an alternating voltage source , rectifying diode bridge, trinistor, thyratron, variable resistor RC circuit and voltage divider, the midpoint of which is connected to the anode of the thyratron and change a second resistor, the second end of which is connected to a control grid of a thyratron, connected by a cathode to a control electrode of a trinistor, connected in parallel with a voltage divider to the diagonal of the bridge bridge, to the other diagonal of the cathode of the triac, the second end of the primary winding of the transformer, and the closing executive contact However, such a controller has a complex circuit implementation and is not reliable enough in operation. The purpose of the invention is to simplify the controller and increase reliability. The goal is achieved by the fact that a temperature controller containing a thermal contactor, a transformer connected by a primary winding to a source of alternating voltage, a rectifying bridge, the input diagonal of which is connected to a trinistor, and an RC in turn connected to a power source a chain with a variable resistor, the capacitor of which is connected in parallel to the thermal contact, is connected to the cathode of the trinistor and one of the outputs of the secondary winding of the transformer by one end, contains connected A rectifying diode and a field-effect transistor, the source-gate electrodes of which are connected parallel to the thermostat and the drain is connected to the control electrode of the trinistor, is between the second terminal of the secondary winding of the transformer and the output of the variable resistor. The drawing shows a circuit diagram of the proposed temperature controller. The controller contains a thermal contact device 1, a heater 2, a transformer 3, a rectifying bridge 4, an RC circuit with a variable resistor 5 and a capacitor 6, a field-effect transistor 7 with a p-channel, a rectifying diode 8, trinis24 tor 9, a current-limiting resistor 10 The primary winding 11 of the transformer 3 is connected to the source of alternating voltage 12, and the secondary 13 to the rectifying diode 8 and to the capacitor 6. The regulator operates as follows. At the moment when the temperature of the regulated object decreases, the thermo-contact 1, the bypass capacitor 6, opens and the charge of the latter starts. As the voltage on the capacitor 6 increases, the amplitude of the pulsating voltage on the drain of the field-effect transistor 7 increases and when this amplitude reaches a certain level, the trinistor 9 opens. Through the open trinistor 9, the rectifier bridge 4 and heater 2 begin to flow. The temperature of the heater begins to rise. When the temperature reaches the set value, the thermo-contact 1 closes, the capacitor 6 is discharged, the field-effect transistor 7 is opened, the control electrode-cathode of the trinistor 9 is shunted. The tristor 9 is closed and the current through the heater 2 is stopped. The temperature starts to fall. Further operation of the controller is repeated. The time during which the temperature decreases, otherwise, the value of the ambiguity zone between the locking and opening of the trinistor 9 is controlled by a variable resistor 5. The temperature controller has an increased reliability and simple circuit. The invention The temperature regulator containing a thermocontact actor transformer connected by a primary winding to a source of alternating voltage, a rectifying bridge, the input diagonal of which is connected to a trinistor, and the output heater, as well as an RC chain with a variable resistor, the capacitor of which is connected in parallel to the thermal sensor, is connected to the cathode of the trinistor and one of the terminals of the secondary winding of the transformer with one end, characterized in that, in order to increase Reliability and simplification, it contains connected between the second terminal of the transformer secondary winding and the terminal