Proportional temperature stabilizer for the incubator. Scheme, description

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Proportional temperature stabilizer for the incubator. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Power regulators, thermometers, heat stabilizers

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This thermostat uses a vertical-phase method of power control in the heating element. On the comparator VT1, the voltage shifted by 90 el. degrees from the secondary winding of the transformer Tr1 and the constant unbalance voltage of the bridge, amplified by the differential stage VT4, VT5, are compared through the VT3 repeater. At the moment of signal equality, through the power amplifier VT2, the control current opens the thyristor VD4. Thermistor R12 is located in the body of the incubator, in the place where the eggs are laid, and is protected from radiation from the heater. Thanks to feedback through the thermistor, the air temperature in the incubator stabilizes. Unlike key circuits, the change in power in the heating element is proportional to the magnitude of the temperature deviation.

The regulator uses one half-cycle of mains voltage, so the power of the heater (usually using incandescent lamps) must be doubled, in relation to sufficient to achieve the desired temperature in your incubator design. When the incubator is first turned on, the process of establishing the operating temperature is of an oscillatory damped character, due to the inertia of the feedback through the air and the temperature sensor. After warming up, capture and proportional control take place. Due to the galvanic connection with the supply network, the circuit must be isolated from the user (and the thermistor, too). Do not rush to lay eggs - let the incubator work for at least a day, and during this time you calibrate the potentiometer scale using a laboratory thermometer. And the unexpected failure of unreliable elements often occurs in the first hours of operation (true for any schemes).

If it is necessary to have large operating temperature limits, it is necessary to increase the value of the potentiometer R14. If the value of the thermistor is different, proportionally change the bridge elements R9, R11, R14, R15. The maximum heater power is determined by the type of thyristor used. When installing a more powerful thyristor, select the required control current with resistor R7. A small heat sink for the thyristor is usually needed. Achieve the coincidence of the control phases and the anode voltage of the thyristor by swapping the ends of the primary winding Tr1, if it did not open immediately with a cold sensor. Ku-ka-re-ku!

Proportional temperature stabilizer for incubator

Publication: cxem.net

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Chip ST25DV02K-W for controlling lights and motors 20.03.2020

STMicroelectronics has released a new series of ST25DV-PWM 13,56 MHz dynamic NFC/RFID tags compatible with NFC phones and professional readers. The series includes ST25DV02K-W1/W2 chips, which differ in the number of PWM outputs (PWM).

The two PWM outputs of the ST25DV02K-W2 can be independently and safely programmed, allowing the NFC chip to be used in devices where smooth analog parameter changes are required. The chip provides real-time PWM parameter updates using a contactless interface through a regular smartphone, which expands the user's ability to control devices without the usual interface in the form of buttons and a display.

The ST25DV02K-W1/2 is an ISO 15693 and NFC Forum Type 5 tag with one or two pulse-width modulation (PWM) outputs and 2 kbit electrically erasable programmable memory (EEPROM). The microcircuit has two interfaces. The first provides up to two independent PWM outputs, and the second is an RF channel activated by the electromagnetic field of the NFC reader. PWM outputs are configurable at boot time and can be updated in real time via RF. The NFC part and PWM drivers are powered separately and can work independently - settings can be written to the chip even if the device is not connected to power and is in the package.

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Особенности ST25DV02K-W1/ST25DV02K-W2:

One or two PWM outputs (4 mA) from 488 to 31250 Hz;
PWM resolution 62,5 nS (9 to 15 bits depending on frequency);
Accuracy: +-10% in temperature range;
No need for an external generator;
Supply voltage from 1,8 V to 5,5 V;
ISO/IEC 15693 radio interface and NFC Forum Type 5 Tag;
EEPROM memory 2 kbit (5 ms block write);
Data retention: 40 years (100k write cycles at 85°C);
Data protection: four areas (including PWM), with password protection;
Digital signature mechanism for TruST25 authentication;
Temperature range -40°C to 105°C (PWM interface);
SO-8 and TSSOP-8 ECOPACK2 enclosures (RoHS compliant).

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