toothache

Cold thermostat kit based on AC switch and STM8S

STEVAL-IHT001V2

Overview

The STEVAL-IHT001V2 thermostat kit provides a robust and low-cost ST solution (microcontroller and AC switches) to control refrigerators, freezers or fridge/freezer combinations.

Basic, defrost, and air circulation versions are configurable in order to address the low-end and medium-end cooling appliances market. It allows the control of a single-phase induction motor and a light bulb, and optionally, a defrost resistor and a fan, working on 220/240 VRMS, 50/60 Hz mains voltage. The thermostat kit is operational with 100/120 V RMS 50/60 Hz but the supply capacitor value must be modified.
The board can operate in an ambient temperature range from 0 °C to 60 °C.
The exact maximum temperature depends on the power of the loads. For demonstrative purposes a graphic user interface (GUI) has been developed.
The connection between the PC and STM8S microcontroller, the MCU performing thermostat regulation, is achieved through a USB bus.
As the STM8S is a low-cost MCU without an embedded USB peripheral, an additional MCU (STM32) has been used as a bridge between the PC and STM8S MCU, for demonstrative purposes only.

Main features

Low-cost solution for spark-free thermostats:
- No need for a sealed version
- Low-cost STM8S microcontroller for thermostat control
- Low-cost capacitive power supply
High efficiency:
- Refrigerator consumption reduction by adjusting and reducing the hysteresis threshold of the temperature
- Improved efficiency by turning on the defrost resistor only when it's useful and not at each OFF cycle of the compressor (as done in some mechanical thermostats)
High system immunity:
- Overvoltage protected ACS switches: ACST610-8FP for compressor control, ACS110-7SN for defrost resistor and ACS102-6TA for light bulb and fan
- Class A criteria for IEC 61000-4-4 up to above 3 kV levels
Flexibility:
- Development: program setting with PC interface to change firmware variables
- Industrialization: end-of-production MCU programming thanks to FLASH, for soft upgrade and efficient MCU stock management
RoHS compliant

Design Files

All reference designs on this site are sourced from major semiconductor manufacturers or collected online for learning and research. The copyright belongs to the semiconductor manufacturer or the original author. If you believe that the reference design of this site infringes upon your relevant rights and interests, please send us a rights notice. As a neutral platform service provider, we will take measures to delete the relevant content in accordance with relevant laws after receiving the relevant notice from the rights holder. Please send relevant notifications to email: bbs_service@eeworld.com.cn.

It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

Hot

Technical Resources More

Search Datasheet?

Supported by EEWorld Datasheet

Technical Videos More

Forum More

Update:2025-06-20 09:42:46

Request LM3S8962 Evaluation Board
If you have time, consider making a simplified TCP/IP TO CAN gateway. After all, the cost advantage is too obvious:loveliness: :loveliness: [[i] This post was last edited by dyc1229 on 2010-10-15 13:2
Talking about portability and system architecture
Many people think that portability is the ability of software to run normally when it is moved from one platform to another hardware platform. This statement is very general. If we think about it care
LM324 amplification problem
I'm working on a pulse measurement project recently, but since I've only been using op amps for a short time, I'm aware of many problems during debugging. The attached file is my lm324 two-stage ampli
How to link the database of Altium and Access with the schematic library and PCB library
I read the post [url]https://bbs.eeworld.com.cn/forum.php?mod=viewthread&tid=474609&highlight=access[/url] and I don't understand step 4, which is to add the file path (including the file name and suf
I drew a minimal system board for 28027. Please help me see if there is anything I need to change.
I drew a minimal system board for 28027. Could you please help me find out if there is anything I need to change?
Request C-SPY download link
Does anyone know the download link for C-SPY? Thanks!

Datasheet More

Circuits More