Temperature-adjustable constant temperature heating system

Abstract

The invention provides a temperature-adjustable constant temperature heating system. Reference voltage in a temperature signal processing unit and a sensor signal output end are respectively connected with two input ends of a signal amplifying circuit; the signal output end of the signal amplifying circuit is connected with the signal input end of a hysteresis comparison circuit in a temperature control unit; the signal output end of a temperature adjustment circuit in the temperature control unit is connected with the other signal input end of the hysteresis comparison circuit; and the signal output end of the hysteresis comparison circuit is connected with a control electrode of a power switch transistor in a power starting unit. Through adjusting backlash voltage of a hysteresis comparator, system temperature errors can be well controlled in an expected range, and excellent constant temperature effects are achieved.

Description

technical field [0001] The invention relates to a constant temperature heating system with adjustable temperature, in particular to the technical field of constant temperature heating. Background technique [0002] Adjustable temperature constant temperature technology is widely used in real life, such as constant temperature box, constant temperature soldering iron, tin furnace, etc. Many constant temperature heating systems use mechanical temperature switches, but the constant temperature effect of this system is worse, and the cost Not low, because the price of this mechanical temperature switch itself is relatively high. There are also many systems that use the MCU to keep the temperature constant through the PID algorithm. This method has a better effect and can better control the overshoot and hysteresis of the system temperature. However, this method involves the design of software and hardware, and the system is more complicated and the cost is higher. In many 936 c...

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Problems solved by technology

There are also many systems that use the MCU to keep the temperature constant through the PID algorithm. This method has a better effect and can better control the overshoot and hysteresis of the system temperature. However, this method involves the design of software and hardware, and the system is more complicated and the cost is higher.

In many 936 constant temperature soldering irons, even some well-known brands of 936 constant temperature soldering irons in China have a design similar to the present invention. The intermediate signal is the reference ground, and the voltage at the lowest point is a negative voltage to drive the bidirectional thyristor, which makes this kind of design more complicated, and many similar designs can only use one type of sensor, or resistive type, Either voltage type, the cost is higher

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