High-stability thermostatic controller
A thermostatic controller, high-stability technology, used in temperature control, non-electric variable control, control/regulation systems, etc., can solve the problems of low accuracy and inconvenient use, and achieve reliable work, cost saving, and equipment reduction. Effect
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Embodiment 1
[0038] Embodiment 1 The basic structure and working principle of the high stability constant temperature controller of the present invention
[0039] Such as figure 1 Shown: the tap output of the potentiometer in the voltage reference circuit (1) is connected with the operational amplifier, as the temperature setting circuit (2), and its output is connected with the display circuit (6). The constant current source is connected in series with the temperature sensor, the measuring voltage terminal is connected with the display circuit (6), the temperature setting circuit (2) and the temperature measurement circuit (3) are connected with the subtractor, and the subtractor is connected with the PI control circuit (4), that is, the PI The control modules are connected, and the PI control module is connected with the limiting protection circuit (5). The output of the limiting protection circuit (5) is connected with the TEC driving circuit (7).
[0040] The working principle of th...
Embodiment 2
[0046] Embodiment 2 Structure of voltage reference circuit (1) and temperature setting circuit (2)
[0047] Such as figure 2 As shown, the voltage reference circuit (1) and the temperature setting circuit (2) of the present invention include: an external DC power supply (Vcc) connects a 9.1k resistor and then connects a precision voltage reference module (LM336) to ground; the temperature of the present invention The setting circuit (2) is to connect a 10k potentiometer to the LM336 in parallel, and its tap is connected to the in-phase input terminal of the operational amplifier U7B; the inverting input terminal of the operational amplifier U7B is connected to a 10k resistor for grounding, and a 22k resistor is connected to the U7B output. In addition, in order to improve the driving ability, a voltage follower composed of U2B is added to the output of U7B. The non-inverting input of U2B is connected to the output of U7B, and the inverting input of U2B is connected to its out...
Embodiment 3
[0048] Embodiment 3 The structure of the temperature measurement circuit (3) of the present invention
[0049] Such as image 3 As shown, the temperature measurement circuit (3) of the present invention comprises: an external DC power supply (Vcc) is connected to a 2.5V voltage regulator tube D1; the voltage regulator tube D1 anode is connected to the non-inverting input terminal of the operational amplifier U1A and a 9.1k resistor R5; The other end of R5 is grounded; the output terminal of the operational amplifier U1A is connected to the 1k resistor R39 and the 470pF capacitor C18; the capacitor C18 is connected to the inverting input terminal of the operational amplifier U1A, and is connected to four resistors (R1, R2, R3 through a single-pole four-throw switch) , R4) and connected to the emitter of the transistor Q1; the above four resistors (R1, R2, R3, R4) are connected to the external DC power supply (Vcc); the resistor R39 is connected to the base of the transistor Q1;...
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